Update vendored ruamel.yaml to v0.17.21 (#37008)

* Vendor ruamel.yaml v0.17.21

* Add unit test for whitespace regression

* Add an abstraction layer in Spack to wrap ruamel.yaml

All YAML operations are routed through spack.util.spack_yaml

The custom classes have been adapted to the new ruamel.yaml
class hierarchy.

Fixed line annotation issue in "spack config blame"

lib/spack/external/__init__.py

@@ -101,10 +101,7 @@
 * Usage: Used for config files. Ruamel is based on PyYAML but is more
   actively maintained and has more features, including round-tripping
   comments read from config files.
-* Version: 0.11.15 (last version supporting Python 2.6)
-* Note: This package has been slightly modified to improve Python 2.6
-  compatibility -- some ``{}`` format strings were replaced, and the
-  import for ``OrderedDict`` was tweaked.
+* Version: 0.17.21
 
 six
 ---

lib/spack/external/_vendoring/ruamel.pyi

@@ -0,0 +1 @@
+from ruamel import *

lib/spack/external/_vendoring/ruamel.yaml.LICENSE

@@ -1,6 +1,7 @@
- 
  The MIT License (MIT)
 
+ Copyright (c) 2014-2022 Anthon van der Neut, Ruamel bvba
+
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
@@ -16,6 +17,5 @@
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
- THE SOFTWARE.
-
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.

lib/spack/external/_vendoring/ruamel/yaml/__init__.py

@@ -0,0 +1,57 @@
+# coding: utf-8
+
+if False:  # MYPY
+    from typing import Dict, Any  # NOQA
+
+_package_data = dict(
+    full_package_name='ruamel.yaml',
+    version_info=(0, 17, 21),
+    __version__='0.17.21',
+    version_timestamp='2022-02-12 09:49:22',
+    author='Anthon van der Neut',
+    author_email='a.van.der.neut@ruamel.eu',
+    description='ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order',  # NOQA
+    entry_points=None,
+    since=2014,
+    extras_require={
+        ':platform_python_implementation=="CPython" and python_version<"3.11"': ['ruamel.yaml.clib>=0.2.6'],  # NOQA
+        'jinja2': ['ruamel.yaml.jinja2>=0.2'],
+        'docs': ['ryd'],
+    },
+    classifiers=[
+        'Programming Language :: Python :: 3 :: Only',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: Implementation :: CPython',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+        'Topic :: Text Processing :: Markup',
+        'Typing :: Typed',
+    ],
+    keywords='yaml 1.2 parser round-trip preserve quotes order config',
+    read_the_docs='yaml',
+    supported=[(3, 5)],  # minimum
+    tox=dict(
+        env='*f',  # f for 3.5
+        fl8excl='_test/lib',
+    ),
+    # universal=True,
+    python_requires='>=3',
+    rtfd='yaml',
+)  # type: Dict[Any, Any]
+
+
+version_info = _package_data['version_info']
+__version__ = _package_data['__version__']
+
+try:
+    from .cyaml import *  # NOQA
+
+    __with_libyaml__ = True
+except (ImportError, ValueError):  # for Jython
+    __with_libyaml__ = False
+
+from ruamel.yaml.main import *  # NOQA

lib/spack/external/_vendoring/ruamel/yaml/anchor.py

@@ -0,0 +1,20 @@
+# coding: utf-8
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Union, Optional, Iterator  # NOQA
+
+anchor_attrib = '_yaml_anchor'
+
+
+class Anchor:
+    __slots__ = 'value', 'always_dump'
+    attrib = anchor_attrib
+
+    def __init__(self):
+        # type: () -> None
+        self.value = None
+        self.always_dump = False
+
+    def __repr__(self):
+        # type: () -> Any
+        ad = ', (always dump)' if self.always_dump else ""
+        return 'Anchor({!r}{})'.format(self.value, ad)

lib/spack/external/_vendoring/ruamel/yaml/compat.py

@@ -0,0 +1,268 @@
+# coding: utf-8
+
+# partially from package six by Benjamin Peterson
+
+import sys
+import os
+import io
+import traceback
+from abc import abstractmethod
+import collections.abc
+
+
+# fmt: off
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Union, BinaryIO, IO, Text, Tuple  # NOQA
+    from typing import Optional  # NOQA
+# fmt: on
+
+_DEFAULT_YAML_VERSION = (1, 2)
+
+try:
+    from collections import OrderedDict
+except ImportError:
+    from ordereddict import OrderedDict  # type: ignore
+
+    # to get the right name import ... as ordereddict doesn't do that
+
+
+class ordereddict(OrderedDict):  # type: ignore
+    if not hasattr(OrderedDict, 'insert'):
+
+        def insert(self, pos, key, value):
+            # type: (int, Any, Any) -> None
+            if pos >= len(self):
+                self[key] = value
+                return
+            od = ordereddict()
+            od.update(self)
+            for k in od:
+                del self[k]
+            for index, old_key in enumerate(od):
+                if pos == index:
+                    self[key] = value
+                self[old_key] = od[old_key]
+
+
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+
+# replace with f-strings when 3.5 support is dropped
+# ft = '42'
+# assert _F('abc {ft!r}', ft=ft) == 'abc %r' % ft
+# 'abc %r' % ft -> _F('abc {ft!r}' -> f'abc {ft!r}'
+def _F(s, *superfluous, **kw):
+    # type: (Any, Any, Any) -> Any
+    if superfluous:
+        raise TypeError
+    return s.format(**kw)
+
+
+StringIO = io.StringIO
+BytesIO = io.BytesIO
+
+if False:  # MYPY
+    # StreamType = Union[BinaryIO, IO[str], IO[unicode],  StringIO]
+    # StreamType = Union[BinaryIO, IO[str], StringIO]  # type: ignore
+    StreamType = Any
+
+    StreamTextType = StreamType  # Union[Text, StreamType]
+    VersionType = Union[List[int], str, Tuple[int, int]]
+
+builtins_module = 'builtins'
+
+
+def with_metaclass(meta, *bases):
+    # type: (Any, Any) -> Any
+    """Create a base class with a metaclass."""
+    return meta('NewBase', bases, {})
+
+
+DBG_TOKEN = 1
+DBG_EVENT = 2
+DBG_NODE = 4
+
+
+_debug = None  # type: Optional[int]
+if 'RUAMELDEBUG' in os.environ:
+    _debugx = os.environ.get('RUAMELDEBUG')
+    if _debugx is None:
+        _debug = 0
+    else:
+        _debug = int(_debugx)
+
+
+if bool(_debug):
+
+    class ObjectCounter:
+        def __init__(self):
+            # type: () -> None
+            self.map = {}  # type: Dict[Any, Any]
+
+        def __call__(self, k):
+            # type: (Any) -> None
+            self.map[k] = self.map.get(k, 0) + 1
+
+        def dump(self):
+            # type: () -> None
+            for k in sorted(self.map):
+                sys.stdout.write('{} -> {}'.format(k, self.map[k]))
+
+    object_counter = ObjectCounter()
+
+
+# used from yaml util when testing
+def dbg(val=None):
+    # type: (Any) -> Any
+    global _debug
+    if _debug is None:
+        # set to true or false
+        _debugx = os.environ.get('YAMLDEBUG')
+        if _debugx is None:
+            _debug = 0
+        else:
+            _debug = int(_debugx)
+    if val is None:
+        return _debug
+    return _debug & val
+
+
+class Nprint:
+    def __init__(self, file_name=None):
+        # type: (Any) -> None
+        self._max_print = None  # type: Any
+        self._count = None  # type: Any
+        self._file_name = file_name
+
+    def __call__(self, *args, **kw):
+        # type: (Any, Any) -> None
+        if not bool(_debug):
+            return
+        out = sys.stdout if self._file_name is None else open(self._file_name, 'a')
+        dbgprint = print  # to fool checking for print statements by dv utility
+        kw1 = kw.copy()
+        kw1['file'] = out
+        dbgprint(*args, **kw1)
+        out.flush()
+        if self._max_print is not None:
+            if self._count is None:
+                self._count = self._max_print
+            self._count -= 1
+            if self._count == 0:
+                dbgprint('forced exit\n')
+                traceback.print_stack()
+                out.flush()
+                sys.exit(0)
+        if self._file_name:
+            out.close()
+
+    def set_max_print(self, i):
+        # type: (int) -> None
+        self._max_print = i
+        self._count = None
+
+    def fp(self, mode='a'):
+        # type: (str) -> Any
+        out = sys.stdout if self._file_name is None else open(self._file_name, mode)
+        return out
+
+
+nprint = Nprint()
+nprintf = Nprint('/var/tmp/ruamel.yaml.log')
+
+# char checkers following production rules
+
+
+def check_namespace_char(ch):
+    # type: (Any) -> bool
+    if '\x21' <= ch <= '\x7E':  # ! to ~
+        return True
+    if '\xA0' <= ch <= '\uD7FF':
+        return True
+    if ('\uE000' <= ch <= '\uFFFD') and ch != '\uFEFF':  # excl. byte order mark
+        return True
+    if '\U00010000' <= ch <= '\U0010FFFF':
+        return True
+    return False
+
+
+def check_anchorname_char(ch):
+    # type: (Any) -> bool
+    if ch in ',[]{}':
+        return False
+    return check_namespace_char(ch)
+
+
+def version_tnf(t1, t2=None):
+    # type: (Any, Any) -> Any
+    """
+    return True if ruamel.yaml version_info < t1, None if t2 is specified and bigger else False
+    """
+    from ruamel.yaml import version_info  # NOQA
+
+    if version_info < t1:
+        return True
+    if t2 is not None and version_info < t2:
+        return None
+    return False
+
+
+class MutableSliceableSequence(collections.abc.MutableSequence):  # type: ignore
+    __slots__ = ()
+
+    def __getitem__(self, index):
+        # type: (Any) -> Any
+        if not isinstance(index, slice):
+            return self.__getsingleitem__(index)
+        return type(self)([self[i] for i in range(*index.indices(len(self)))])  # type: ignore
+
+    def __setitem__(self, index, value):
+        # type: (Any, Any) -> None
+        if not isinstance(index, slice):
+            return self.__setsingleitem__(index, value)
+        assert iter(value)
+        # nprint(index.start, index.stop, index.step, index.indices(len(self)))
+        if index.step is None:
+            del self[index.start : index.stop]
+            for elem in reversed(value):
+                self.insert(0 if index.start is None else index.start, elem)
+        else:
+            range_parms = index.indices(len(self))
+            nr_assigned_items = (range_parms[1] - range_parms[0] - 1) // range_parms[2] + 1
+            # need to test before changing, in case TypeError is caught
+            if nr_assigned_items < len(value):
+                raise TypeError(
+                    'too many elements in value {} < {}'.format(nr_assigned_items, len(value))
+                )
+            elif nr_assigned_items > len(value):
+                raise TypeError(
+                    'not enough elements in value {} > {}'.format(
+                        nr_assigned_items, len(value)
+                    )
+                )
+            for idx, i in enumerate(range(*range_parms)):
+                self[i] = value[idx]
+
+    def __delitem__(self, index):
+        # type: (Any) -> None
+        if not isinstance(index, slice):
+            return self.__delsingleitem__(index)
+        # nprint(index.start, index.stop, index.step, index.indices(len(self)))
+        for i in reversed(range(*index.indices(len(self)))):
+            del self[i]
+
+    @abstractmethod
+    def __getsingleitem__(self, index):
+        # type: (Any) -> Any
+        raise IndexError
+
+    @abstractmethod
+    def __setsingleitem__(self, index, value):
+        # type: (Any, Any) -> None
+        raise IndexError
+
+    @abstractmethod
+    def __delsingleitem__(self, index):
+        # type: (Any) -> None
+        raise IndexError

lib/spack/external/_vendoring/ruamel/yaml/composer.py

@@ -0,0 +1,243 @@
+# coding: utf-8
+
+import warnings
+
+from ruamel.yaml.error import MarkedYAMLError, ReusedAnchorWarning
+from ruamel.yaml.compat import _F, nprint, nprintf  # NOQA
+
+from ruamel.yaml.events import (
+    StreamStartEvent,
+    StreamEndEvent,
+    MappingStartEvent,
+    MappingEndEvent,
+    SequenceStartEvent,
+    SequenceEndEvent,
+    AliasEvent,
+    ScalarEvent,
+)
+from ruamel.yaml.nodes import MappingNode, ScalarNode, SequenceNode
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List  # NOQA
+
+__all__ = ['Composer', 'ComposerError']
+
+
+class ComposerError(MarkedYAMLError):
+    pass
+
+
+class Composer:
+    def __init__(self, loader=None):
+        # type: (Any) -> None
+        self.loader = loader
+        if self.loader is not None and getattr(self.loader, '_composer', None) is None:
+            self.loader._composer = self
+        self.anchors = {}  # type: Dict[Any, Any]
+
+    @property
+    def parser(self):
+        # type: () -> Any
+        if hasattr(self.loader, 'typ'):
+            self.loader.parser
+        return self.loader._parser
+
+    @property
+    def resolver(self):
+        # type: () -> Any
+        # assert self.loader._resolver is not None
+        if hasattr(self.loader, 'typ'):
+            self.loader.resolver
+        return self.loader._resolver
+
+    def check_node(self):
+        # type: () -> Any
+        # Drop the STREAM-START event.
+        if self.parser.check_event(StreamStartEvent):
+            self.parser.get_event()
+
+        # If there are more documents available?
+        return not self.parser.check_event(StreamEndEvent)
+
+    def get_node(self):
+        # type: () -> Any
+        # Get the root node of the next document.
+        if not self.parser.check_event(StreamEndEvent):
+            return self.compose_document()
+
+    def get_single_node(self):
+        # type: () -> Any
+        # Drop the STREAM-START event.
+        self.parser.get_event()
+
+        # Compose a document if the stream is not empty.
+        document = None  # type: Any
+        if not self.parser.check_event(StreamEndEvent):
+            document = self.compose_document()
+
+        # Ensure that the stream contains no more documents.
+        if not self.parser.check_event(StreamEndEvent):
+            event = self.parser.get_event()
+            raise ComposerError(
+                'expected a single document in the stream',
+                document.start_mark,
+                'but found another document',
+                event.start_mark,
+            )
+
+        # Drop the STREAM-END event.
+        self.parser.get_event()
+
+        return document
+
+    def compose_document(self):
+        # type: (Any) -> Any
+        # Drop the DOCUMENT-START event.
+        self.parser.get_event()
+
+        # Compose the root node.
+        node = self.compose_node(None, None)
+
+        # Drop the DOCUMENT-END event.
+        self.parser.get_event()
+
+        self.anchors = {}
+        return node
+
+    def return_alias(self, a):
+        # type: (Any) -> Any
+        return a
+
+    def compose_node(self, parent, index):
+        # type: (Any, Any) -> Any
+        if self.parser.check_event(AliasEvent):
+            event = self.parser.get_event()
+            alias = event.anchor
+            if alias not in self.anchors:
+                raise ComposerError(
+                    None,
+                    None,
+                    _F('found undefined alias {alias!r}', alias=alias),
+                    event.start_mark,
+                )
+            return self.return_alias(self.anchors[alias])
+        event = self.parser.peek_event()
+        anchor = event.anchor
+        if anchor is not None:  # have an anchor
+            if anchor in self.anchors:
+                # raise ComposerError(
+                #     "found duplicate anchor %r; first occurrence"
+                #     % (anchor), self.anchors[anchor].start_mark,
+                #     "second occurrence", event.start_mark)
+                ws = (
+                    '\nfound duplicate anchor {!r}\nfirst occurrence {}\nsecond occurrence '
+                    '{}'.format((anchor), self.anchors[anchor].start_mark, event.start_mark)
+                )
+                warnings.warn(ws, ReusedAnchorWarning)
+        self.resolver.descend_resolver(parent, index)
+        if self.parser.check_event(ScalarEvent):
+            node = self.compose_scalar_node(anchor)
+        elif self.parser.check_event(SequenceStartEvent):
+            node = self.compose_sequence_node(anchor)
+        elif self.parser.check_event(MappingStartEvent):
+            node = self.compose_mapping_node(anchor)
+        self.resolver.ascend_resolver()
+        return node
+
+    def compose_scalar_node(self, anchor):
+        # type: (Any) -> Any
+        event = self.parser.get_event()
+        tag = event.tag
+        if tag is None or tag == '!':
+            tag = self.resolver.resolve(ScalarNode, event.value, event.implicit)
+        node = ScalarNode(
+            tag,
+            event.value,
+            event.start_mark,
+            event.end_mark,
+            style=event.style,
+            comment=event.comment,
+            anchor=anchor,
+        )
+        if anchor is not None:
+            self.anchors[anchor] = node
+        return node
+
+    def compose_sequence_node(self, anchor):
+        # type: (Any) -> Any
+        start_event = self.parser.get_event()
+        tag = start_event.tag
+        if tag is None or tag == '!':
+            tag = self.resolver.resolve(SequenceNode, None, start_event.implicit)
+        node = SequenceNode(
+            tag,
+            [],
+            start_event.start_mark,
+            None,
+            flow_style=start_event.flow_style,
+            comment=start_event.comment,
+            anchor=anchor,
+        )
+        if anchor is not None:
+            self.anchors[anchor] = node
+        index = 0
+        while not self.parser.check_event(SequenceEndEvent):
+            node.value.append(self.compose_node(node, index))
+            index += 1
+        end_event = self.parser.get_event()
+        if node.flow_style is True and end_event.comment is not None:
+            if node.comment is not None:
+                nprint(
+                    'Warning: unexpected end_event commment in sequence '
+                    'node {}'.format(node.flow_style)
+                )
+            node.comment = end_event.comment
+        node.end_mark = end_event.end_mark
+        self.check_end_doc_comment(end_event, node)
+        return node
+
+    def compose_mapping_node(self, anchor):
+        # type: (Any) -> Any
+        start_event = self.parser.get_event()
+        tag = start_event.tag
+        if tag is None or tag == '!':
+            tag = self.resolver.resolve(MappingNode, None, start_event.implicit)
+        node = MappingNode(
+            tag,
+            [],
+            start_event.start_mark,
+            None,
+            flow_style=start_event.flow_style,
+            comment=start_event.comment,
+            anchor=anchor,
+        )
+        if anchor is not None:
+            self.anchors[anchor] = node
+        while not self.parser.check_event(MappingEndEvent):
+            # key_event = self.parser.peek_event()
+            item_key = self.compose_node(node, None)
+            # if item_key in node.value:
+            #     raise ComposerError("while composing a mapping",
+            #             start_event.start_mark,
+            #             "found duplicate key", key_event.start_mark)
+            item_value = self.compose_node(node, item_key)
+            # node.value[item_key] = item_value
+            node.value.append((item_key, item_value))
+        end_event = self.parser.get_event()
+        if node.flow_style is True and end_event.comment is not None:
+            node.comment = end_event.comment
+        node.end_mark = end_event.end_mark
+        self.check_end_doc_comment(end_event, node)
+        return node
+
+    def check_end_doc_comment(self, end_event, node):
+        # type: (Any, Any) -> None
+        if end_event.comment and end_event.comment[1]:
+            # pre comments on an end_event, no following to move to
+            if node.comment is None:
+                node.comment = [None, None]
+            assert not isinstance(node, ScalarEvent)
+            # this is a post comment on a mapping node, add as third element
+            # in the list
+            node.comment.append(end_event.comment[1])
+            end_event.comment[1] = None

lib/spack/external/_vendoring/ruamel/yaml/configobjwalker.py

@@ -0,0 +1,14 @@
+# coding: utf-8
+
+import warnings
+
+from ruamel.yaml.util import configobj_walker as new_configobj_walker
+
+if False:  # MYPY
+    from typing import Any  # NOQA
+
+
+def configobj_walker(cfg):
+    # type: (Any) -> Any
+    warnings.warn('configobj_walker has moved to ruamel.yaml.util, please update your code')
+    return new_configobj_walker(cfg)

lib/spack/external/_vendoring/ruamel/yaml/cyaml.py

@@ -0,0 +1,183 @@
+# coding: utf-8
+
+from _ruamel_yaml import CParser, CEmitter  # type: ignore
+
+from ruamel.yaml.constructor import Constructor, BaseConstructor, SafeConstructor
+from ruamel.yaml.representer import Representer, SafeRepresenter, BaseRepresenter
+from ruamel.yaml.resolver import Resolver, BaseResolver
+
+if False:  # MYPY
+    from typing import Any, Union, Optional  # NOQA
+    from ruamel.yaml.compat import StreamTextType, StreamType, VersionType  # NOQA
+
+__all__ = ['CBaseLoader', 'CSafeLoader', 'CLoader', 'CBaseDumper', 'CSafeDumper', 'CDumper']
+
+
+# this includes some hacks to solve the  usage of resolver by lower level
+# parts of the parser
+
+
+class CBaseLoader(CParser, BaseConstructor, BaseResolver):  # type: ignore
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        CParser.__init__(self, stream)
+        self._parser = self._composer = self
+        BaseConstructor.__init__(self, loader=self)
+        BaseResolver.__init__(self, loadumper=self)
+        # self.descend_resolver = self._resolver.descend_resolver
+        # self.ascend_resolver = self._resolver.ascend_resolver
+        # self.resolve = self._resolver.resolve
+
+
+class CSafeLoader(CParser, SafeConstructor, Resolver):  # type: ignore
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        CParser.__init__(self, stream)
+        self._parser = self._composer = self
+        SafeConstructor.__init__(self, loader=self)
+        Resolver.__init__(self, loadumper=self)
+        # self.descend_resolver = self._resolver.descend_resolver
+        # self.ascend_resolver = self._resolver.ascend_resolver
+        # self.resolve = self._resolver.resolve
+
+
+class CLoader(CParser, Constructor, Resolver):  # type: ignore
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        CParser.__init__(self, stream)
+        self._parser = self._composer = self
+        Constructor.__init__(self, loader=self)
+        Resolver.__init__(self, loadumper=self)
+        # self.descend_resolver = self._resolver.descend_resolver
+        # self.ascend_resolver = self._resolver.ascend_resolver
+        # self.resolve = self._resolver.resolve
+
+
+class CBaseDumper(CEmitter, BaseRepresenter, BaseResolver):  # type: ignore
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None   # NOQA
+        CEmitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            encoding=encoding,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+        )
+        self._emitter = self._serializer = self._representer = self
+        BaseRepresenter.__init__(
+            self,
+            default_style=default_style,
+            default_flow_style=default_flow_style,
+            dumper=self,
+        )
+        BaseResolver.__init__(self, loadumper=self)
+
+
+class CSafeDumper(CEmitter, SafeRepresenter, Resolver):  # type: ignore
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None   # NOQA
+        self._emitter = self._serializer = self._representer = self
+        CEmitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            encoding=encoding,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+        )
+        self._emitter = self._serializer = self._representer = self
+        SafeRepresenter.__init__(
+            self, default_style=default_style, default_flow_style=default_flow_style
+        )
+        Resolver.__init__(self)
+
+
+class CDumper(CEmitter, Representer, Resolver):  # type: ignore
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None   # NOQA
+        CEmitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            encoding=encoding,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+        )
+        self._emitter = self._serializer = self._representer = self
+        Representer.__init__(
+            self, default_style=default_style, default_flow_style=default_flow_style
+        )
+        Resolver.__init__(self)

lib/spack/external/_vendoring/ruamel/yaml/dumper.py

@@ -0,0 +1,219 @@
+# coding: utf-8
+
+from ruamel.yaml.emitter import Emitter
+from ruamel.yaml.serializer import Serializer
+from ruamel.yaml.representer import (
+    Representer,
+    SafeRepresenter,
+    BaseRepresenter,
+    RoundTripRepresenter,
+)
+from ruamel.yaml.resolver import Resolver, BaseResolver, VersionedResolver
+
+if False:  # MYPY
+    from typing import Any, Dict, List, Union, Optional  # NOQA
+    from ruamel.yaml.compat import StreamType, VersionType  # NOQA
+
+__all__ = ['BaseDumper', 'SafeDumper', 'Dumper', 'RoundTripDumper']
+
+
+class BaseDumper(Emitter, Serializer, BaseRepresenter, BaseResolver):
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (Any, StreamType, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None   # NOQA
+        Emitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            block_seq_indent=block_seq_indent,
+            dumper=self,
+        )
+        Serializer.__init__(
+            self,
+            encoding=encoding,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+            dumper=self,
+        )
+        BaseRepresenter.__init__(
+            self,
+            default_style=default_style,
+            default_flow_style=default_flow_style,
+            dumper=self,
+        )
+        BaseResolver.__init__(self, loadumper=self)
+
+
+class SafeDumper(Emitter, Serializer, SafeRepresenter, Resolver):
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None  # NOQA
+        Emitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            block_seq_indent=block_seq_indent,
+            dumper=self,
+        )
+        Serializer.__init__(
+            self,
+            encoding=encoding,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+            dumper=self,
+        )
+        SafeRepresenter.__init__(
+            self,
+            default_style=default_style,
+            default_flow_style=default_flow_style,
+            dumper=self,
+        )
+        Resolver.__init__(self, loadumper=self)
+
+
+class Dumper(Emitter, Serializer, Representer, Resolver):
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Any, Optional[bool], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None   # NOQA
+        Emitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            block_seq_indent=block_seq_indent,
+            dumper=self,
+        )
+        Serializer.__init__(
+            self,
+            encoding=encoding,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+            dumper=self,
+        )
+        Representer.__init__(
+            self,
+            default_style=default_style,
+            default_flow_style=default_flow_style,
+            dumper=self,
+        )
+        Resolver.__init__(self, loadumper=self)
+
+
+class RoundTripDumper(Emitter, Serializer, RoundTripRepresenter, VersionedResolver):
+    def __init__(
+        self,
+        stream,
+        default_style=None,
+        default_flow_style=None,
+        canonical=None,
+        indent=None,
+        width=None,
+        allow_unicode=None,
+        line_break=None,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        block_seq_indent=None,
+        top_level_colon_align=None,
+        prefix_colon=None,
+    ):
+        # type: (StreamType, Any, Optional[bool], Optional[int], Optional[int], Optional[int], Optional[bool], Any, Any, Optional[bool], Optional[bool], Any, Any, Any, Any, Any) -> None  # NOQA
+        Emitter.__init__(
+            self,
+            stream,
+            canonical=canonical,
+            indent=indent,
+            width=width,
+            allow_unicode=allow_unicode,
+            line_break=line_break,
+            block_seq_indent=block_seq_indent,
+            top_level_colon_align=top_level_colon_align,
+            prefix_colon=prefix_colon,
+            dumper=self,
+        )
+        Serializer.__init__(
+            self,
+            encoding=encoding,
+            explicit_start=explicit_start,
+            explicit_end=explicit_end,
+            version=version,
+            tags=tags,
+            dumper=self,
+        )
+        RoundTripRepresenter.__init__(
+            self,
+            default_style=default_style,
+            default_flow_style=default_flow_style,
+            dumper=self,
+        )
+        VersionedResolver.__init__(self, loader=self)

lib/spack/external/_vendoring/ruamel/yaml/error.py

@@ -0,0 +1,332 @@
+# coding: utf-8
+
+import warnings
+import textwrap
+
+from ruamel.yaml.compat import _F
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Text  # NOQA
+
+
+__all__ = [
+    'FileMark',
+    'StringMark',
+    'CommentMark',
+    'YAMLError',
+    'MarkedYAMLError',
+    'ReusedAnchorWarning',
+    'UnsafeLoaderWarning',
+    'MarkedYAMLWarning',
+    'MarkedYAMLFutureWarning',
+]
+
+
+class StreamMark:
+    __slots__ = 'name', 'index', 'line', 'column'
+
+    def __init__(self, name, index, line, column):
+        # type: (Any, int, int, int) -> None
+        self.name = name
+        self.index = index
+        self.line = line
+        self.column = column
+
+    def __str__(self):
+        # type: () -> Any
+        where = _F(
+            '  in "{sname!s}", line {sline1:d}, column {scolumn1:d}',
+            sname=self.name,
+            sline1=self.line + 1,
+            scolumn1=self.column + 1,
+        )
+        return where
+
+    def __eq__(self, other):
+        # type: (Any) -> bool
+        if self.line != other.line or self.column != other.column:
+            return False
+        if self.name != other.name or self.index != other.index:
+            return False
+        return True
+
+    def __ne__(self, other):
+        # type: (Any) -> bool
+        return not self.__eq__(other)
+
+
+class FileMark(StreamMark):
+    __slots__ = ()
+
+
+class StringMark(StreamMark):
+    __slots__ = 'name', 'index', 'line', 'column', 'buffer', 'pointer'
+
+    def __init__(self, name, index, line, column, buffer, pointer):
+        # type: (Any, int, int, int, Any, Any) -> None
+        StreamMark.__init__(self, name, index, line, column)
+        self.buffer = buffer
+        self.pointer = pointer
+
+    def get_snippet(self, indent=4, max_length=75):
+        # type: (int, int) -> Any
+        if self.buffer is None:  # always False
+            return None
+        head = ""
+        start = self.pointer
+        while start > 0 and self.buffer[start - 1] not in '\0\r\n\x85\u2028\u2029':
+            start -= 1
+            if self.pointer - start > max_length / 2 - 1:
+                head = ' ... '
+                start += 5
+                break
+        tail = ""
+        end = self.pointer
+        while end < len(self.buffer) and self.buffer[end] not in '\0\r\n\x85\u2028\u2029':
+            end += 1
+            if end - self.pointer > max_length / 2 - 1:
+                tail = ' ... '
+                end -= 5
+                break
+        snippet = self.buffer[start:end]
+        caret = '^'
+        caret = '^ (line: {})'.format(self.line + 1)
+        return (
+            ' ' * indent
+            + head
+            + snippet
+            + tail
+            + '\n'
+            + ' ' * (indent + self.pointer - start + len(head))
+            + caret
+        )
+
+    def __str__(self):
+        # type: () -> Any
+        snippet = self.get_snippet()
+        where = _F(
+            '  in "{sname!s}", line {sline1:d}, column {scolumn1:d}',
+            sname=self.name,
+            sline1=self.line + 1,
+            scolumn1=self.column + 1,
+        )
+        if snippet is not None:
+            where += ':\n' + snippet
+        return where
+
+    def __repr__(self):
+        # type: () -> Any
+        snippet = self.get_snippet()
+        where = _F(
+            '  in "{sname!s}", line {sline1:d}, column {scolumn1:d}',
+            sname=self.name,
+            sline1=self.line + 1,
+            scolumn1=self.column + 1,
+        )
+        if snippet is not None:
+            where += ':\n' + snippet
+        return where
+
+
+class CommentMark:
+    __slots__ = ('column',)
+
+    def __init__(self, column):
+        # type: (Any) -> None
+        self.column = column
+
+
+class YAMLError(Exception):
+    pass
+
+
+class MarkedYAMLError(YAMLError):
+    def __init__(
+        self,
+        context=None,
+        context_mark=None,
+        problem=None,
+        problem_mark=None,
+        note=None,
+        warn=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any) -> None
+        self.context = context
+        self.context_mark = context_mark
+        self.problem = problem
+        self.problem_mark = problem_mark
+        self.note = note
+        # warn is ignored
+
+    def __str__(self):
+        # type: () -> Any
+        lines = []  # type: List[str]
+        if self.context is not None:
+            lines.append(self.context)
+        if self.context_mark is not None and (
+            self.problem is None
+            or self.problem_mark is None
+            or self.context_mark.name != self.problem_mark.name
+            or self.context_mark.line != self.problem_mark.line
+            or self.context_mark.column != self.problem_mark.column
+        ):
+            lines.append(str(self.context_mark))
+        if self.problem is not None:
+            lines.append(self.problem)
+        if self.problem_mark is not None:
+            lines.append(str(self.problem_mark))
+        if self.note is not None and self.note:
+            note = textwrap.dedent(self.note)
+            lines.append(note)
+        return '\n'.join(lines)
+
+
+class YAMLStreamError(Exception):
+    pass
+
+
+class YAMLWarning(Warning):
+    pass
+
+
+class MarkedYAMLWarning(YAMLWarning):
+    def __init__(
+        self,
+        context=None,
+        context_mark=None,
+        problem=None,
+        problem_mark=None,
+        note=None,
+        warn=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any) -> None
+        self.context = context
+        self.context_mark = context_mark
+        self.problem = problem
+        self.problem_mark = problem_mark
+        self.note = note
+        self.warn = warn
+
+    def __str__(self):
+        # type: () -> Any
+        lines = []  # type: List[str]
+        if self.context is not None:
+            lines.append(self.context)
+        if self.context_mark is not None and (
+            self.problem is None
+            or self.problem_mark is None
+            or self.context_mark.name != self.problem_mark.name
+            or self.context_mark.line != self.problem_mark.line
+            or self.context_mark.column != self.problem_mark.column
+        ):
+            lines.append(str(self.context_mark))
+        if self.problem is not None:
+            lines.append(self.problem)
+        if self.problem_mark is not None:
+            lines.append(str(self.problem_mark))
+        if self.note is not None and self.note:
+            note = textwrap.dedent(self.note)
+            lines.append(note)
+        if self.warn is not None and self.warn:
+            warn = textwrap.dedent(self.warn)
+            lines.append(warn)
+        return '\n'.join(lines)
+
+
+class ReusedAnchorWarning(YAMLWarning):
+    pass
+
+
+class UnsafeLoaderWarning(YAMLWarning):
+    text = """
+The default 'Loader' for 'load(stream)' without further arguments can be unsafe.
+Use 'load(stream, Loader=ruamel.yaml.Loader)' explicitly if that is OK.
+Alternatively include the following in your code:
+
+  import warnings
+  warnings.simplefilter('ignore', ruamel.yaml.error.UnsafeLoaderWarning)
+
+In most other cases you should consider using 'safe_load(stream)'"""
+    pass
+
+
+warnings.simplefilter('once', UnsafeLoaderWarning)
+
+
+class MantissaNoDotYAML1_1Warning(YAMLWarning):
+    def __init__(self, node, flt_str):
+        # type: (Any, Any) -> None
+        self.node = node
+        self.flt = flt_str
+
+    def __str__(self):
+        # type: () -> Any
+        line = self.node.start_mark.line
+        col = self.node.start_mark.column
+        return """
+In YAML 1.1 floating point values should have a dot ('.') in their mantissa.
+See the Floating-Point Language-Independent Type for YAML™ Version 1.1 specification
+( http://yaml.org/type/float.html ). This dot is not required for JSON nor for YAML 1.2
+
+Correct your float: "{}" on line: {}, column: {}
+
+or alternatively include the following in your code:
+
+  import warnings
+  warnings.simplefilter('ignore', ruamel.yaml.error.MantissaNoDotYAML1_1Warning)
+
+""".format(
+            self.flt, line, col
+        )
+
+
+warnings.simplefilter('once', MantissaNoDotYAML1_1Warning)
+
+
+class YAMLFutureWarning(Warning):
+    pass
+
+
+class MarkedYAMLFutureWarning(YAMLFutureWarning):
+    def __init__(
+        self,
+        context=None,
+        context_mark=None,
+        problem=None,
+        problem_mark=None,
+        note=None,
+        warn=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any) -> None
+        self.context = context
+        self.context_mark = context_mark
+        self.problem = problem
+        self.problem_mark = problem_mark
+        self.note = note
+        self.warn = warn
+
+    def __str__(self):
+        # type: () -> Any
+        lines = []  # type: List[str]
+        if self.context is not None:
+            lines.append(self.context)
+
+        if self.context_mark is not None and (
+            self.problem is None
+            or self.problem_mark is None
+            or self.context_mark.name != self.problem_mark.name
+            or self.context_mark.line != self.problem_mark.line
+            or self.context_mark.column != self.problem_mark.column
+        ):
+            lines.append(str(self.context_mark))
+        if self.problem is not None:
+            lines.append(self.problem)
+        if self.problem_mark is not None:
+            lines.append(str(self.problem_mark))
+        if self.note is not None and self.note:
+            note = textwrap.dedent(self.note)
+            lines.append(note)
+        if self.warn is not None and self.warn:
+            warn = textwrap.dedent(self.warn)
+            lines.append(warn)
+        return '\n'.join(lines)

lib/spack/external/_vendoring/ruamel/yaml/events.py

@@ -0,0 +1,196 @@
+# coding: utf-8
+
+from ruamel.yaml.compat import _F
+
+# Abstract classes.
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List  # NOQA
+
+SHOW_LINES = False
+
+
+def CommentCheck():
+    # type: () -> None
+    pass
+
+
+class Event:
+    __slots__ = 'start_mark', 'end_mark', 'comment'
+
+    def __init__(self, start_mark=None, end_mark=None, comment=CommentCheck):
+        # type: (Any, Any, Any) -> None
+        self.start_mark = start_mark
+        self.end_mark = end_mark
+        # assert comment is not CommentCheck
+        if comment is CommentCheck:
+            comment = None
+        self.comment = comment
+
+    def __repr__(self):
+        # type: () -> Any
+        if True:
+            arguments = []
+            if hasattr(self, 'value'):
+                # if you use repr(getattr(self, 'value')) then flake8 complains about
+                # abuse of getattr with a constant. When you change to self.value
+                # then mypy throws an error
+                arguments.append(repr(self.value))  # type: ignore
+            for key in ['anchor', 'tag', 'implicit', 'flow_style', 'style']:
+                v = getattr(self, key, None)
+                if v is not None:
+                    arguments.append(_F('{key!s}={v!r}', key=key, v=v))
+            if self.comment not in [None, CommentCheck]:
+                arguments.append('comment={!r}'.format(self.comment))
+            if SHOW_LINES:
+                arguments.append(
+                    '({}:{}/{}:{})'.format(
+                        self.start_mark.line,
+                        self.start_mark.column,
+                        self.end_mark.line,
+                        self.end_mark.column,
+                    )
+                )
+            arguments = ', '.join(arguments)  # type: ignore
+        else:
+            attributes = [
+                key
+                for key in ['anchor', 'tag', 'implicit', 'value', 'flow_style', 'style']
+                if hasattr(self, key)
+            ]
+            arguments = ', '.join(
+                [_F('{k!s}={attr!r}', k=key, attr=getattr(self, key)) for key in attributes]
+            )
+            if self.comment not in [None, CommentCheck]:
+                arguments += ', comment={!r}'.format(self.comment)
+        return _F(
+            '{self_class_name!s}({arguments!s})',
+            self_class_name=self.__class__.__name__,
+            arguments=arguments,
+        )
+
+
+class NodeEvent(Event):
+    __slots__ = ('anchor',)
+
+    def __init__(self, anchor, start_mark=None, end_mark=None, comment=None):
+        # type: (Any, Any, Any, Any) -> None
+        Event.__init__(self, start_mark, end_mark, comment)
+        self.anchor = anchor
+
+
+class CollectionStartEvent(NodeEvent):
+    __slots__ = 'tag', 'implicit', 'flow_style', 'nr_items'
+
+    def __init__(
+        self,
+        anchor,
+        tag,
+        implicit,
+        start_mark=None,
+        end_mark=None,
+        flow_style=None,
+        comment=None,
+        nr_items=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any, Optional[int]) -> None
+        NodeEvent.__init__(self, anchor, start_mark, end_mark, comment)
+        self.tag = tag
+        self.implicit = implicit
+        self.flow_style = flow_style
+        self.nr_items = nr_items
+
+
+class CollectionEndEvent(Event):
+    __slots__ = ()
+
+
+# Implementations.
+
+
+class StreamStartEvent(Event):
+    __slots__ = ('encoding',)
+
+    def __init__(self, start_mark=None, end_mark=None, encoding=None, comment=None):
+        # type: (Any, Any, Any, Any) -> None
+        Event.__init__(self, start_mark, end_mark, comment)
+        self.encoding = encoding
+
+
+class StreamEndEvent(Event):
+    __slots__ = ()
+
+
+class DocumentStartEvent(Event):
+    __slots__ = 'explicit', 'version', 'tags'
+
+    def __init__(
+        self,
+        start_mark=None,
+        end_mark=None,
+        explicit=None,
+        version=None,
+        tags=None,
+        comment=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any) -> None
+        Event.__init__(self, start_mark, end_mark, comment)
+        self.explicit = explicit
+        self.version = version
+        self.tags = tags
+
+
+class DocumentEndEvent(Event):
+    __slots__ = ('explicit',)
+
+    def __init__(self, start_mark=None, end_mark=None, explicit=None, comment=None):
+        # type: (Any, Any, Any, Any) -> None
+        Event.__init__(self, start_mark, end_mark, comment)
+        self.explicit = explicit
+
+
+class AliasEvent(NodeEvent):
+    __slots__ = 'style'
+
+    def __init__(self, anchor, start_mark=None, end_mark=None, style=None, comment=None):
+        # type: (Any, Any, Any, Any, Any) -> None
+        NodeEvent.__init__(self, anchor, start_mark, end_mark, comment)
+        self.style = style
+
+
+class ScalarEvent(NodeEvent):
+    __slots__ = 'tag', 'implicit', 'value', 'style'
+
+    def __init__(
+        self,
+        anchor,
+        tag,
+        implicit,
+        value,
+        start_mark=None,
+        end_mark=None,
+        style=None,
+        comment=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any, Any) -> None
+        NodeEvent.__init__(self, anchor, start_mark, end_mark, comment)
+        self.tag = tag
+        self.implicit = implicit
+        self.value = value
+        self.style = style
+
+
+class SequenceStartEvent(CollectionStartEvent):
+    __slots__ = ()
+
+
+class SequenceEndEvent(CollectionEndEvent):
+    __slots__ = ()
+
+
+class MappingStartEvent(CollectionStartEvent):
+    __slots__ = ()
+
+
+class MappingEndEvent(CollectionEndEvent):
+    __slots__ = ()

lib/spack/external/_vendoring/ruamel/yaml/loader.py

@@ -0,0 +1,75 @@
+# coding: utf-8
+
+from ruamel.yaml.reader import Reader
+from ruamel.yaml.scanner import Scanner, RoundTripScanner
+from ruamel.yaml.parser import Parser, RoundTripParser
+from ruamel.yaml.composer import Composer
+from ruamel.yaml.constructor import (
+    BaseConstructor,
+    SafeConstructor,
+    Constructor,
+    RoundTripConstructor,
+)
+from ruamel.yaml.resolver import VersionedResolver
+
+if False:  # MYPY
+    from typing import Any, Dict, List, Union, Optional  # NOQA
+    from ruamel.yaml.compat import StreamTextType, VersionType  # NOQA
+
+__all__ = ['BaseLoader', 'SafeLoader', 'Loader', 'RoundTripLoader']
+
+
+class BaseLoader(Reader, Scanner, Parser, Composer, BaseConstructor, VersionedResolver):
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        self.comment_handling = None
+        Reader.__init__(self, stream, loader=self)
+        Scanner.__init__(self, loader=self)
+        Parser.__init__(self, loader=self)
+        Composer.__init__(self, loader=self)
+        BaseConstructor.__init__(self, loader=self)
+        VersionedResolver.__init__(self, version, loader=self)
+
+
+class SafeLoader(Reader, Scanner, Parser, Composer, SafeConstructor, VersionedResolver):
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        self.comment_handling = None
+        Reader.__init__(self, stream, loader=self)
+        Scanner.__init__(self, loader=self)
+        Parser.__init__(self, loader=self)
+        Composer.__init__(self, loader=self)
+        SafeConstructor.__init__(self, loader=self)
+        VersionedResolver.__init__(self, version, loader=self)
+
+
+class Loader(Reader, Scanner, Parser, Composer, Constructor, VersionedResolver):
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        self.comment_handling = None
+        Reader.__init__(self, stream, loader=self)
+        Scanner.__init__(self, loader=self)
+        Parser.__init__(self, loader=self)
+        Composer.__init__(self, loader=self)
+        Constructor.__init__(self, loader=self)
+        VersionedResolver.__init__(self, version, loader=self)
+
+
+class RoundTripLoader(
+    Reader,
+    RoundTripScanner,
+    RoundTripParser,
+    Composer,
+    RoundTripConstructor,
+    VersionedResolver,
+):
+    def __init__(self, stream, version=None, preserve_quotes=None):
+        # type: (StreamTextType, Optional[VersionType], Optional[bool]) -> None
+        # self.reader = Reader.__init__(self, stream)
+        self.comment_handling = None  # issue 385
+        Reader.__init__(self, stream, loader=self)
+        RoundTripScanner.__init__(self, loader=self)
+        RoundTripParser.__init__(self, loader=self)
+        Composer.__init__(self, loader=self)
+        RoundTripConstructor.__init__(self, preserve_quotes=preserve_quotes, loader=self)
+        VersionedResolver.__init__(self, version, loader=self)

lib/spack/external/_vendoring/ruamel/yaml/nodes.py

@@ -0,0 +1,135 @@
+# coding: utf-8
+
+import sys
+
+from ruamel.yaml.compat import _F
+
+if False:  # MYPY
+    from typing import Dict, Any, Text  # NOQA
+
+
+class Node:
+    __slots__ = 'tag', 'value', 'start_mark', 'end_mark', 'comment', 'anchor'
+
+    def __init__(self, tag, value, start_mark, end_mark, comment=None, anchor=None):
+        # type: (Any, Any, Any, Any, Any, Any) -> None
+        self.tag = tag
+        self.value = value
+        self.start_mark = start_mark
+        self.end_mark = end_mark
+        self.comment = comment
+        self.anchor = anchor
+
+    def __repr__(self):
+        # type: () -> Any
+        value = self.value
+        # if isinstance(value, list):
+        #     if len(value) == 0:
+        #         value = '<empty>'
+        #     elif len(value) == 1:
+        #         value = '<1 item>'
+        #     else:
+        #         value = f'<{len(value)} items>'
+        # else:
+        #     if len(value) > 75:
+        #         value = repr(value[:70]+' ... ')
+        #     else:
+        #         value = repr(value)
+        value = repr(value)
+        return _F(
+            '{class_name!s}(tag={self_tag!r}, value={value!s})',
+            class_name=self.__class__.__name__,
+            self_tag=self.tag,
+            value=value,
+        )
+
+    def dump(self, indent=0):
+        # type: (int) -> None
+        if isinstance(self.value, str):
+            sys.stdout.write(
+                '{}{}(tag={!r}, value={!r})\n'.format(
+                    '  ' * indent, self.__class__.__name__, self.tag, self.value
+                )
+            )
+            if self.comment:
+                sys.stdout.write('    {}comment: {})\n'.format('  ' * indent, self.comment))
+            return
+        sys.stdout.write(
+            '{}{}(tag={!r})\n'.format('  ' * indent, self.__class__.__name__, self.tag)
+        )
+        if self.comment:
+            sys.stdout.write('    {}comment: {})\n'.format('  ' * indent, self.comment))
+        for v in self.value:
+            if isinstance(v, tuple):
+                for v1 in v:
+                    v1.dump(indent + 1)
+            elif isinstance(v, Node):
+                v.dump(indent + 1)
+            else:
+                sys.stdout.write('Node value type? {}\n'.format(type(v)))
+
+
+class ScalarNode(Node):
+    """
+    styles:
+      ? -> set() ? key, no value
+      " -> double quoted
+      ' -> single quoted
+      | -> literal style
+      > -> folding style
+    """
+
+    __slots__ = ('style',)
+    id = 'scalar'
+
+    def __init__(
+        self, tag, value, start_mark=None, end_mark=None, style=None, comment=None, anchor=None
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any) -> None
+        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment, anchor=anchor)
+        self.style = style
+
+
+class CollectionNode(Node):
+    __slots__ = ('flow_style',)
+
+    def __init__(
+        self,
+        tag,
+        value,
+        start_mark=None,
+        end_mark=None,
+        flow_style=None,
+        comment=None,
+        anchor=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any) -> None
+        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment)
+        self.flow_style = flow_style
+        self.anchor = anchor
+
+
+class SequenceNode(CollectionNode):
+    __slots__ = ()
+    id = 'sequence'
+
+
+class MappingNode(CollectionNode):
+    __slots__ = ('merge',)
+    id = 'mapping'
+
+    def __init__(
+        self,
+        tag,
+        value,
+        start_mark=None,
+        end_mark=None,
+        flow_style=None,
+        comment=None,
+        anchor=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any) -> None
+        CollectionNode.__init__(
+            self, tag, value, start_mark, end_mark, flow_style, comment, anchor
+        )
+        self.merge = None

lib/spack/external/_vendoring/ruamel/yaml/parser.py

@@ -0,0 +1,884 @@
+# coding: utf-8
+
+# The following YAML grammar is LL(1) and is parsed by a recursive descent
+# parser.
+#
+# stream            ::= STREAM-START implicit_document? explicit_document*
+#                                                                   STREAM-END
+# implicit_document ::= block_node DOCUMENT-END*
+# explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
+# block_node_or_indentless_sequence ::=
+#                       ALIAS
+#                       | properties (block_content |
+#                                                   indentless_block_sequence)?
+#                       | block_content
+#                       | indentless_block_sequence
+# block_node        ::= ALIAS
+#                       | properties block_content?
+#                       | block_content
+# flow_node         ::= ALIAS
+#                       | properties flow_content?
+#                       | flow_content
+# properties        ::= TAG ANCHOR? | ANCHOR TAG?
+# block_content     ::= block_collection | flow_collection | SCALAR
+# flow_content      ::= flow_collection | SCALAR
+# block_collection  ::= block_sequence | block_mapping
+# flow_collection   ::= flow_sequence | flow_mapping
+# block_sequence    ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)*
+#                                                                   BLOCK-END
+# indentless_sequence   ::= (BLOCK-ENTRY block_node?)+
+# block_mapping     ::= BLOCK-MAPPING_START
+#                       ((KEY block_node_or_indentless_sequence?)?
+#                       (VALUE block_node_or_indentless_sequence?)?)*
+#                       BLOCK-END
+# flow_sequence     ::= FLOW-SEQUENCE-START
+#                       (flow_sequence_entry FLOW-ENTRY)*
+#                       flow_sequence_entry?
+#                       FLOW-SEQUENCE-END
+# flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
+# flow_mapping      ::= FLOW-MAPPING-START
+#                       (flow_mapping_entry FLOW-ENTRY)*
+#                       flow_mapping_entry?
+#                       FLOW-MAPPING-END
+# flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?
+#
+# FIRST sets:
+#
+# stream: { STREAM-START <}
+# explicit_document: { DIRECTIVE DOCUMENT-START }
+# implicit_document: FIRST(block_node)
+# block_node: { ALIAS TAG ANCHOR SCALAR BLOCK-SEQUENCE-START
+#                  BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START }
+# flow_node: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START }
+# block_content: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START
+#                               FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
+# flow_content: { FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
+# block_collection: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START }
+# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
+# block_sequence: { BLOCK-SEQUENCE-START }
+# block_mapping: { BLOCK-MAPPING-START }
+# block_node_or_indentless_sequence: { ALIAS ANCHOR TAG SCALAR
+#               BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START
+#               FLOW-MAPPING-START BLOCK-ENTRY }
+# indentless_sequence: { ENTRY }
+# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
+# flow_sequence: { FLOW-SEQUENCE-START }
+# flow_mapping: { FLOW-MAPPING-START }
+# flow_sequence_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START
+#                                                    FLOW-MAPPING-START KEY }
+# flow_mapping_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START
+#                                                    FLOW-MAPPING-START KEY }
+
+# need to have full path with import, as pkg_resources tries to load parser.py in __init__.py
+# only to not do anything with the package afterwards
+# and for Jython too
+
+
+from ruamel.yaml.error import MarkedYAMLError
+from ruamel.yaml.tokens import *  # NOQA
+from ruamel.yaml.events import *  # NOQA
+from ruamel.yaml.scanner import Scanner, RoundTripScanner, ScannerError  # NOQA
+from ruamel.yaml.scanner import BlankLineComment
+from ruamel.yaml.comments import C_PRE, C_POST, C_SPLIT_ON_FIRST_BLANK
+from ruamel.yaml.compat import _F, nprint, nprintf  # NOQA
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Optional  # NOQA
+
+__all__ = ['Parser', 'RoundTripParser', 'ParserError']
+
+
+def xprintf(*args, **kw):
+    # type: (Any, Any) -> Any
+    return nprintf(*args, **kw)
+    pass
+
+
+class ParserError(MarkedYAMLError):
+    pass
+
+
+class Parser:
+    # Since writing a recursive-descendant parser is a straightforward task, we
+    # do not give many comments here.
+
+    DEFAULT_TAGS = {'!': '!', '!!': 'tag:yaml.org,2002:'}
+
+    def __init__(self, loader):
+        # type: (Any) -> None
+        self.loader = loader
+        if self.loader is not None and getattr(self.loader, '_parser', None) is None:
+            self.loader._parser = self
+        self.reset_parser()
+
+    def reset_parser(self):
+        # type: () -> None
+        # Reset the state attributes (to clear self-references)
+        self.current_event = self.last_event = None
+        self.tag_handles = {}  # type: Dict[Any, Any]
+        self.states = []  # type: List[Any]
+        self.marks = []  # type: List[Any]
+        self.state = self.parse_stream_start  # type: Any
+
+    def dispose(self):
+        # type: () -> None
+        self.reset_parser()
+
+    @property
+    def scanner(self):
+        # type: () -> Any
+        if hasattr(self.loader, 'typ'):
+            return self.loader.scanner
+        return self.loader._scanner
+
+    @property
+    def resolver(self):
+        # type: () -> Any
+        if hasattr(self.loader, 'typ'):
+            return self.loader.resolver
+        return self.loader._resolver
+
+    def check_event(self, *choices):
+        # type: (Any) -> bool
+        # Check the type of the next event.
+        if self.current_event is None:
+            if self.state:
+                self.current_event = self.state()
+        if self.current_event is not None:
+            if not choices:
+                return True
+            for choice in choices:
+                if isinstance(self.current_event, choice):
+                    return True
+        return False
+
+    def peek_event(self):
+        # type: () -> Any
+        # Get the next event.
+        if self.current_event is None:
+            if self.state:
+                self.current_event = self.state()
+        return self.current_event
+
+    def get_event(self):
+        # type: () -> Any
+        # Get the next event and proceed further.
+        if self.current_event is None:
+            if self.state:
+                self.current_event = self.state()
+        # assert self.current_event is not None
+        # if self.current_event.end_mark.line != self.peek_event().start_mark.line:
+        xprintf('get_event', repr(self.current_event), self.peek_event().start_mark.line)
+        self.last_event = value = self.current_event
+        self.current_event = None
+        return value
+
+    # stream    ::= STREAM-START implicit_document? explicit_document*
+    #                                                               STREAM-END
+    # implicit_document ::= block_node DOCUMENT-END*
+    # explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
+
+    def parse_stream_start(self):
+        # type: () -> Any
+        # Parse the stream start.
+        token = self.scanner.get_token()
+        self.move_token_comment(token)
+        event = StreamStartEvent(token.start_mark, token.end_mark, encoding=token.encoding)
+
+        # Prepare the next state.
+        self.state = self.parse_implicit_document_start
+
+        return event
+
+    def parse_implicit_document_start(self):
+        # type: () -> Any
+        # Parse an implicit document.
+        if not self.scanner.check_token(DirectiveToken, DocumentStartToken, StreamEndToken):
+            self.tag_handles = self.DEFAULT_TAGS
+            token = self.scanner.peek_token()
+            start_mark = end_mark = token.start_mark
+            event = DocumentStartEvent(start_mark, end_mark, explicit=False)
+
+            # Prepare the next state.
+            self.states.append(self.parse_document_end)
+            self.state = self.parse_block_node
+
+            return event
+
+        else:
+            return self.parse_document_start()
+
+    def parse_document_start(self):
+        # type: () -> Any
+        # Parse any extra document end indicators.
+        while self.scanner.check_token(DocumentEndToken):
+            self.scanner.get_token()
+        # Parse an explicit document.
+        if not self.scanner.check_token(StreamEndToken):
+            version, tags = self.process_directives()
+            if not self.scanner.check_token(DocumentStartToken):
+                raise ParserError(
+                    None,
+                    None,
+                    _F(
+                        "expected '<document start>', but found {pt!r}",
+                        pt=self.scanner.peek_token().id,
+                    ),
+                    self.scanner.peek_token().start_mark,
+                )
+            token = self.scanner.get_token()
+            start_mark = token.start_mark
+            end_mark = token.end_mark
+            # if self.loader is not None and \
+            #    end_mark.line != self.scanner.peek_token().start_mark.line:
+            #     self.loader.scalar_after_indicator = False
+            event = DocumentStartEvent(
+                start_mark, end_mark, explicit=True, version=version, tags=tags,
+                comment=token.comment
+            )  # type: Any
+            self.states.append(self.parse_document_end)
+            self.state = self.parse_document_content
+        else:
+            # Parse the end of the stream.
+            token = self.scanner.get_token()
+            event = StreamEndEvent(token.start_mark, token.end_mark, comment=token.comment)
+            assert not self.states
+            assert not self.marks
+            self.state = None
+        return event
+
+    def parse_document_end(self):
+        # type: () -> Any
+        # Parse the document end.
+        token = self.scanner.peek_token()
+        start_mark = end_mark = token.start_mark
+        explicit = False
+        if self.scanner.check_token(DocumentEndToken):
+            token = self.scanner.get_token()
+            end_mark = token.end_mark
+            explicit = True
+        event = DocumentEndEvent(start_mark, end_mark, explicit=explicit)
+
+        # Prepare the next state.
+        if self.resolver.processing_version == (1, 1):
+            self.state = self.parse_document_start
+        else:
+            self.state = self.parse_implicit_document_start
+
+        return event
+
+    def parse_document_content(self):
+        # type: () -> Any
+        if self.scanner.check_token(
+            DirectiveToken, DocumentStartToken, DocumentEndToken, StreamEndToken
+        ):
+            event = self.process_empty_scalar(self.scanner.peek_token().start_mark)
+            self.state = self.states.pop()
+            return event
+        else:
+            return self.parse_block_node()
+
+    def process_directives(self):
+        # type: () -> Any
+        yaml_version = None
+        self.tag_handles = {}
+        while self.scanner.check_token(DirectiveToken):
+            token = self.scanner.get_token()
+            if token.name == 'YAML':
+                if yaml_version is not None:
+                    raise ParserError(
+                        None, None, 'found duplicate YAML directive', token.start_mark
+                    )
+                major, minor = token.value
+                if major != 1:
+                    raise ParserError(
+                        None,
+                        None,
+                        'found incompatible YAML document (version 1.* is required)',
+                        token.start_mark,
+                    )
+                yaml_version = token.value
+            elif token.name == 'TAG':
+                handle, prefix = token.value
+                if handle in self.tag_handles:
+                    raise ParserError(
+                        None,
+                        None,
+                        _F('duplicate tag handle {handle!r}', handle=handle),
+                        token.start_mark,
+                    )
+                self.tag_handles[handle] = prefix
+        if bool(self.tag_handles):
+            value = yaml_version, self.tag_handles.copy()  # type: Any
+        else:
+            value = yaml_version, None
+        if self.loader is not None and hasattr(self.loader, 'tags'):
+            self.loader.version = yaml_version
+            if self.loader.tags is None:
+                self.loader.tags = {}
+            for k in self.tag_handles:
+                self.loader.tags[k] = self.tag_handles[k]
+        for key in self.DEFAULT_TAGS:
+            if key not in self.tag_handles:
+                self.tag_handles[key] = self.DEFAULT_TAGS[key]
+        return value
+
+    # block_node_or_indentless_sequence ::= ALIAS
+    #               | properties (block_content | indentless_block_sequence)?
+    #               | block_content
+    #               | indentless_block_sequence
+    # block_node    ::= ALIAS
+    #                   | properties block_content?
+    #                   | block_content
+    # flow_node     ::= ALIAS
+    #                   | properties flow_content?
+    #                   | flow_content
+    # properties    ::= TAG ANCHOR? | ANCHOR TAG?
+    # block_content     ::= block_collection | flow_collection | SCALAR
+    # flow_content      ::= flow_collection | SCALAR
+    # block_collection  ::= block_sequence | block_mapping
+    # flow_collection   ::= flow_sequence | flow_mapping
+
+    def parse_block_node(self):
+        # type: () -> Any
+        return self.parse_node(block=True)
+
+    def parse_flow_node(self):
+        # type: () -> Any
+        return self.parse_node()
+
+    def parse_block_node_or_indentless_sequence(self):
+        # type: () -> Any
+        return self.parse_node(block=True, indentless_sequence=True)
+
+    def transform_tag(self, handle, suffix):
+        # type: (Any, Any) -> Any
+        return self.tag_handles[handle] + suffix
+
+    def parse_node(self, block=False, indentless_sequence=False):
+        # type: (bool, bool) -> Any
+        if self.scanner.check_token(AliasToken):
+            token = self.scanner.get_token()
+            event = AliasEvent(token.value, token.start_mark, token.end_mark)  # type: Any
+            self.state = self.states.pop()
+            return event
+
+        anchor = None
+        tag = None
+        start_mark = end_mark = tag_mark = None
+        if self.scanner.check_token(AnchorToken):
+            token = self.scanner.get_token()
+            self.move_token_comment(token)
+            start_mark = token.start_mark
+            end_mark = token.end_mark
+            anchor = token.value
+            if self.scanner.check_token(TagToken):
+                token = self.scanner.get_token()
+                tag_mark = token.start_mark
+                end_mark = token.end_mark
+                tag = token.value
+        elif self.scanner.check_token(TagToken):
+            token = self.scanner.get_token()
+            start_mark = tag_mark = token.start_mark
+            end_mark = token.end_mark
+            tag = token.value
+            if self.scanner.check_token(AnchorToken):
+                token = self.scanner.get_token()
+                start_mark = tag_mark = token.start_mark
+                end_mark = token.end_mark
+                anchor = token.value
+        if tag is not None:
+            handle, suffix = tag
+            if handle is not None:
+                if handle not in self.tag_handles:
+                    raise ParserError(
+                        'while parsing a node',
+                        start_mark,
+                        _F('found undefined tag handle {handle!r}', handle=handle),
+                        tag_mark,
+                    )
+                tag = self.transform_tag(handle, suffix)
+            else:
+                tag = suffix
+        # if tag == '!':
+        #     raise ParserError("while parsing a node", start_mark,
+        #             "found non-specific tag '!'", tag_mark,
+        #      "Please check 'http://pyyaml.org/wiki/YAMLNonSpecificTag'
+        #     and share your opinion.")
+        if start_mark is None:
+            start_mark = end_mark = self.scanner.peek_token().start_mark
+        event = None
+        implicit = tag is None or tag == '!'
+        if indentless_sequence and self.scanner.check_token(BlockEntryToken):
+            comment = None
+            pt = self.scanner.peek_token()
+            if self.loader and self.loader.comment_handling is None:
+                if pt.comment and pt.comment[0]:
+                    comment = [pt.comment[0], []]
+                    pt.comment[0] = None
+            elif self.loader:
+                if pt.comment:
+                    comment = pt.comment
+            end_mark = self.scanner.peek_token().end_mark
+            event = SequenceStartEvent(
+                anchor, tag, implicit, start_mark, end_mark, flow_style=False, comment=comment
+            )
+            self.state = self.parse_indentless_sequence_entry
+            return event
+
+        if self.scanner.check_token(ScalarToken):
+            token = self.scanner.get_token()
+            # self.scanner.peek_token_same_line_comment(token)
+            end_mark = token.end_mark
+            if (token.plain and tag is None) or tag == '!':
+                implicit = (True, False)
+            elif tag is None:
+                implicit = (False, True)
+            else:
+                implicit = (False, False)
+            # nprint('se', token.value, token.comment)
+            event = ScalarEvent(
+                anchor,
+                tag,
+                implicit,
+                token.value,
+                start_mark,
+                end_mark,
+                style=token.style,
+                comment=token.comment,
+            )
+            self.state = self.states.pop()
+        elif self.scanner.check_token(FlowSequenceStartToken):
+            pt = self.scanner.peek_token()
+            end_mark = pt.end_mark
+            event = SequenceStartEvent(
+                anchor,
+                tag,
+                implicit,
+                start_mark,
+                end_mark,
+                flow_style=True,
+                comment=pt.comment,
+            )
+            self.state = self.parse_flow_sequence_first_entry
+        elif self.scanner.check_token(FlowMappingStartToken):
+            pt = self.scanner.peek_token()
+            end_mark = pt.end_mark
+            event = MappingStartEvent(
+                anchor,
+                tag,
+                implicit,
+                start_mark,
+                end_mark,
+                flow_style=True,
+                comment=pt.comment,
+            )
+            self.state = self.parse_flow_mapping_first_key
+        elif block and self.scanner.check_token(BlockSequenceStartToken):
+            end_mark = self.scanner.peek_token().start_mark
+            # should inserting the comment be dependent on the
+            # indentation?
+            pt = self.scanner.peek_token()
+            comment = pt.comment
+            # nprint('pt0', type(pt))
+            if comment is None or comment[1] is None:
+                comment = pt.split_old_comment()
+            # nprint('pt1', comment)
+            event = SequenceStartEvent(
+                anchor, tag, implicit, start_mark, end_mark, flow_style=False, comment=comment
+            )
+            self.state = self.parse_block_sequence_first_entry
+        elif block and self.scanner.check_token(BlockMappingStartToken):
+            end_mark = self.scanner.peek_token().start_mark
+            comment = self.scanner.peek_token().comment
+            event = MappingStartEvent(
+                anchor, tag, implicit, start_mark, end_mark, flow_style=False, comment=comment
+            )
+            self.state = self.parse_block_mapping_first_key
+        elif anchor is not None or tag is not None:
+            # Empty scalars are allowed even if a tag or an anchor is
+            # specified.
+            event = ScalarEvent(anchor, tag, (implicit, False), "", start_mark, end_mark)
+            self.state = self.states.pop()
+        else:
+            if block:
+                node = 'block'
+            else:
+                node = 'flow'
+            token = self.scanner.peek_token()
+            raise ParserError(
+                _F('while parsing a {node!s} node', node=node),
+                start_mark,
+                _F('expected the node content, but found {token_id!r}', token_id=token.id),
+                token.start_mark,
+            )
+        return event
+
+    # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)*
+    #                                                               BLOCK-END
+
+    def parse_block_sequence_first_entry(self):
+        # type: () -> Any
+        token = self.scanner.get_token()
+        # move any comment from start token
+        # self.move_token_comment(token)
+        self.marks.append(token.start_mark)
+        return self.parse_block_sequence_entry()
+
+    def parse_block_sequence_entry(self):
+        # type: () -> Any
+        if self.scanner.check_token(BlockEntryToken):
+            token = self.scanner.get_token()
+            self.move_token_comment(token)
+            if not self.scanner.check_token(BlockEntryToken, BlockEndToken):
+                self.states.append(self.parse_block_sequence_entry)
+                return self.parse_block_node()
+            else:
+                self.state = self.parse_block_sequence_entry
+                return self.process_empty_scalar(token.end_mark)
+        if not self.scanner.check_token(BlockEndToken):
+            token = self.scanner.peek_token()
+            raise ParserError(
+                'while parsing a block collection',
+                self.marks[-1],
+                _F('expected <block end>, but found {token_id!r}', token_id=token.id),
+                token.start_mark,
+            )
+        token = self.scanner.get_token()  # BlockEndToken
+        event = SequenceEndEvent(token.start_mark, token.end_mark, comment=token.comment)
+        self.state = self.states.pop()
+        self.marks.pop()
+        return event
+
+    # indentless_sequence ::= (BLOCK-ENTRY block_node?)+
+
+    # indentless_sequence?
+    # sequence:
+    # - entry
+    #  - nested
+
+    def parse_indentless_sequence_entry(self):
+        # type: () -> Any
+        if self.scanner.check_token(BlockEntryToken):
+            token = self.scanner.get_token()
+            self.move_token_comment(token)
+            if not self.scanner.check_token(
+                BlockEntryToken, KeyToken, ValueToken, BlockEndToken
+            ):
+                self.states.append(self.parse_indentless_sequence_entry)
+                return self.parse_block_node()
+            else:
+                self.state = self.parse_indentless_sequence_entry
+                return self.process_empty_scalar(token.end_mark)
+        token = self.scanner.peek_token()
+        c = None
+        if self.loader and self.loader.comment_handling is None:
+            c = token.comment
+            start_mark = token.start_mark
+        else:
+            start_mark = self.last_event.end_mark  # type: ignore
+            c = self.distribute_comment(token.comment, start_mark.line)  # type: ignore
+        event = SequenceEndEvent(start_mark, start_mark, comment=c)
+        self.state = self.states.pop()
+        return event
+
+    # block_mapping     ::= BLOCK-MAPPING_START
+    #                       ((KEY block_node_or_indentless_sequence?)?
+    #                       (VALUE block_node_or_indentless_sequence?)?)*
+    #                       BLOCK-END
+
+    def parse_block_mapping_first_key(self):
+        # type: () -> Any
+        token = self.scanner.get_token()
+        self.marks.append(token.start_mark)
+        return self.parse_block_mapping_key()
+
+    def parse_block_mapping_key(self):
+        # type: () -> Any
+        if self.scanner.check_token(KeyToken):
+            token = self.scanner.get_token()
+            self.move_token_comment(token)
+            if not self.scanner.check_token(KeyToken, ValueToken, BlockEndToken):
+                self.states.append(self.parse_block_mapping_value)
+                return self.parse_block_node_or_indentless_sequence()
+            else:
+                self.state = self.parse_block_mapping_value
+                return self.process_empty_scalar(token.end_mark)
+        if self.resolver.processing_version > (1, 1) and self.scanner.check_token(ValueToken):
+            self.state = self.parse_block_mapping_value
+            return self.process_empty_scalar(self.scanner.peek_token().start_mark)
+        if not self.scanner.check_token(BlockEndToken):
+            token = self.scanner.peek_token()
+            raise ParserError(
+                'while parsing a block mapping',
+                self.marks[-1],
+                _F('expected <block end>, but found {token_id!r}', token_id=token.id),
+                token.start_mark,
+            )
+        token = self.scanner.get_token()
+        self.move_token_comment(token)
+        event = MappingEndEvent(token.start_mark, token.end_mark, comment=token.comment)
+        self.state = self.states.pop()
+        self.marks.pop()
+        return event
+
+    def parse_block_mapping_value(self):
+        # type: () -> Any
+        if self.scanner.check_token(ValueToken):
+            token = self.scanner.get_token()
+            # value token might have post comment move it to e.g. block
+            if self.scanner.check_token(ValueToken):
+                self.move_token_comment(token)
+            else:
+                if not self.scanner.check_token(KeyToken):
+                    self.move_token_comment(token, empty=True)
+                # else: empty value for this key cannot move token.comment
+            if not self.scanner.check_token(KeyToken, ValueToken, BlockEndToken):
+                self.states.append(self.parse_block_mapping_key)
+                return self.parse_block_node_or_indentless_sequence()
+            else:
+                self.state = self.parse_block_mapping_key
+                comment = token.comment
+                if comment is None:
+                    token = self.scanner.peek_token()
+                    comment = token.comment
+                    if comment:
+                        token._comment = [None, comment[1]]
+                        comment = [comment[0], None]
+                return self.process_empty_scalar(token.end_mark, comment=comment)
+        else:
+            self.state = self.parse_block_mapping_key
+            token = self.scanner.peek_token()
+            return self.process_empty_scalar(token.start_mark)
+
+    # flow_sequence     ::= FLOW-SEQUENCE-START
+    #                       (flow_sequence_entry FLOW-ENTRY)*
+    #                       flow_sequence_entry?
+    #                       FLOW-SEQUENCE-END
+    # flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
+    #
+    # Note that while production rules for both flow_sequence_entry and
+    # flow_mapping_entry are equal, their interpretations are different.
+    # For `flow_sequence_entry`, the part `KEY flow_node? (VALUE flow_node?)?`
+    # generate an inline mapping (set syntax).
+
+    def parse_flow_sequence_first_entry(self):
+        # type: () -> Any
+        token = self.scanner.get_token()
+        self.marks.append(token.start_mark)
+        return self.parse_flow_sequence_entry(first=True)
+
+    def parse_flow_sequence_entry(self, first=False):
+        # type: (bool) -> Any
+        if not self.scanner.check_token(FlowSequenceEndToken):
+            if not first:
+                if self.scanner.check_token(FlowEntryToken):
+                    self.scanner.get_token()
+                else:
+                    token = self.scanner.peek_token()
+                    raise ParserError(
+                        'while parsing a flow sequence',
+                        self.marks[-1],
+                        _F("expected ',' or ']', but got {token_id!r}", token_id=token.id),
+                        token.start_mark,
+                    )
+
+            if self.scanner.check_token(KeyToken):
+                token = self.scanner.peek_token()
+                event = MappingStartEvent(
+                    None, None, True, token.start_mark, token.end_mark, flow_style=True
+                )  # type: Any
+                self.state = self.parse_flow_sequence_entry_mapping_key
+                return event
+            elif not self.scanner.check_token(FlowSequenceEndToken):
+                self.states.append(self.parse_flow_sequence_entry)
+                return self.parse_flow_node()
+        token = self.scanner.get_token()
+        event = SequenceEndEvent(token.start_mark, token.end_mark, comment=token.comment)
+        self.state = self.states.pop()
+        self.marks.pop()
+        return event
+
+    def parse_flow_sequence_entry_mapping_key(self):
+        # type: () -> Any
+        token = self.scanner.get_token()
+        if not self.scanner.check_token(ValueToken, FlowEntryToken, FlowSequenceEndToken):
+            self.states.append(self.parse_flow_sequence_entry_mapping_value)
+            return self.parse_flow_node()
+        else:
+            self.state = self.parse_flow_sequence_entry_mapping_value
+            return self.process_empty_scalar(token.end_mark)
+
+    def parse_flow_sequence_entry_mapping_value(self):
+        # type: () -> Any
+        if self.scanner.check_token(ValueToken):
+            token = self.scanner.get_token()
+            if not self.scanner.check_token(FlowEntryToken, FlowSequenceEndToken):
+                self.states.append(self.parse_flow_sequence_entry_mapping_end)
+                return self.parse_flow_node()
+            else:
+                self.state = self.parse_flow_sequence_entry_mapping_end
+                return self.process_empty_scalar(token.end_mark)
+        else:
+            self.state = self.parse_flow_sequence_entry_mapping_end
+            token = self.scanner.peek_token()
+            return self.process_empty_scalar(token.start_mark)
+
+    def parse_flow_sequence_entry_mapping_end(self):
+        # type: () -> Any
+        self.state = self.parse_flow_sequence_entry
+        token = self.scanner.peek_token()
+        return MappingEndEvent(token.start_mark, token.start_mark)
+
+    # flow_mapping  ::= FLOW-MAPPING-START
+    #                   (flow_mapping_entry FLOW-ENTRY)*
+    #                   flow_mapping_entry?
+    #                   FLOW-MAPPING-END
+    # flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?
+
+    def parse_flow_mapping_first_key(self):
+        # type: () -> Any
+        token = self.scanner.get_token()
+        self.marks.append(token.start_mark)
+        return self.parse_flow_mapping_key(first=True)
+
+    def parse_flow_mapping_key(self, first=False):
+        # type: (Any) -> Any
+        if not self.scanner.check_token(FlowMappingEndToken):
+            if not first:
+                if self.scanner.check_token(FlowEntryToken):
+                    self.scanner.get_token()
+                else:
+                    token = self.scanner.peek_token()
+                    raise ParserError(
+                        'while parsing a flow mapping',
+                        self.marks[-1],
+                        _F("expected ',' or '}}', but got {token_id!r}", token_id=token.id),
+                        token.start_mark,
+                    )
+            if self.scanner.check_token(KeyToken):
+                token = self.scanner.get_token()
+                if not self.scanner.check_token(
+                    ValueToken, FlowEntryToken, FlowMappingEndToken
+                ):
+                    self.states.append(self.parse_flow_mapping_value)
+                    return self.parse_flow_node()
+                else:
+                    self.state = self.parse_flow_mapping_value
+                    return self.process_empty_scalar(token.end_mark)
+            elif self.resolver.processing_version > (1, 1) and self.scanner.check_token(
+                ValueToken
+            ):
+                self.state = self.parse_flow_mapping_value
+                return self.process_empty_scalar(self.scanner.peek_token().end_mark)
+            elif not self.scanner.check_token(FlowMappingEndToken):
+                self.states.append(self.parse_flow_mapping_empty_value)
+                return self.parse_flow_node()
+        token = self.scanner.get_token()
+        event = MappingEndEvent(token.start_mark, token.end_mark, comment=token.comment)
+        self.state = self.states.pop()
+        self.marks.pop()
+        return event
+
+    def parse_flow_mapping_value(self):
+        # type: () -> Any
+        if self.scanner.check_token(ValueToken):
+            token = self.scanner.get_token()
+            if not self.scanner.check_token(FlowEntryToken, FlowMappingEndToken):
+                self.states.append(self.parse_flow_mapping_key)
+                return self.parse_flow_node()
+            else:
+                self.state = self.parse_flow_mapping_key
+                return self.process_empty_scalar(token.end_mark)
+        else:
+            self.state = self.parse_flow_mapping_key
+            token = self.scanner.peek_token()
+            return self.process_empty_scalar(token.start_mark)
+
+    def parse_flow_mapping_empty_value(self):
+        # type: () -> Any
+        self.state = self.parse_flow_mapping_key
+        return self.process_empty_scalar(self.scanner.peek_token().start_mark)
+
+    def process_empty_scalar(self, mark, comment=None):
+        # type: (Any, Any) -> Any
+        return ScalarEvent(None, None, (True, False), "", mark, mark, comment=comment)
+
+    def move_token_comment(self, token, nt=None, empty=False):
+        # type: (Any, Optional[Any], Optional[bool]) -> Any
+        pass
+
+
+class RoundTripParser(Parser):
+    """roundtrip is a safe loader, that wants to see the unmangled tag"""
+
+    def transform_tag(self, handle, suffix):
+        # type: (Any, Any) -> Any
+        # return self.tag_handles[handle]+suffix
+        if handle == '!!' and suffix in (
+            'null',
+            'bool',
+            'int',
+            'float',
+            'binary',
+            'timestamp',
+            'omap',
+            'pairs',
+            'set',
+            'str',
+            'seq',
+            'map',
+        ):
+            return Parser.transform_tag(self, handle, suffix)
+        return handle + suffix
+
+    def move_token_comment(self, token, nt=None, empty=False):
+        # type: (Any, Optional[Any], Optional[bool]) -> Any
+        token.move_old_comment(self.scanner.peek_token() if nt is None else nt, empty=empty)
+
+
+class RoundTripParserSC(RoundTripParser):
+    """roundtrip is a safe loader, that wants to see the unmangled tag"""
+
+    # some of the differences are based on the superclass testing
+    # if self.loader.comment_handling is not None
+
+    def move_token_comment(self, token, nt=None, empty=False):
+        # type: (Any, Any, Any, Optional[bool]) -> None
+        token.move_new_comment(self.scanner.peek_token() if nt is None else nt, empty=empty)
+
+    def distribute_comment(self, comment, line):
+        # type: (Any, Any) -> Any
+        # ToDo, look at indentation of the comment to determine attachment
+        if comment is None:
+            return None
+        if not comment[0]:
+            return None
+        if comment[0][0] != line + 1:
+            nprintf('>>>dcxxx', comment, line)
+        assert comment[0][0] == line + 1
+        # if comment[0] - line > 1:
+        #     return
+        typ = self.loader.comment_handling & 0b11
+        # nprintf('>>>dca', comment, line, typ)
+        if typ == C_POST:
+            return None
+        if typ == C_PRE:
+            c = [None, None, comment[0]]
+            comment[0] = None
+            return c
+        # nprintf('>>>dcb', comment[0])
+        for _idx, cmntidx in enumerate(comment[0]):
+            # nprintf('>>>dcb', cmntidx)
+            if isinstance(self.scanner.comments[cmntidx], BlankLineComment):
+                break
+        else:
+            return None  # no space found
+        if _idx == 0:
+            return None  # first line was blank
+        # nprintf('>>>dcc', idx)
+        if typ == C_SPLIT_ON_FIRST_BLANK:
+            c = [None, None, comment[0][:_idx]]
+            comment[0] = comment[0][_idx:]
+            return c
+        raise NotImplementedError  # reserved

lib/spack/external/_vendoring/ruamel/yaml/reader.py

@@ -0,0 +1,302 @@
+# coding: utf-8
+
+# This module contains abstractions for the input stream. You don't have to
+# looks further, there are no pretty code.
+#
+# We define two classes here.
+#
+#   Mark(source, line, column)
+# It's just a record and its only use is producing nice error messages.
+# Parser does not use it for any other purposes.
+#
+#   Reader(source, data)
+# Reader determines the encoding of `data` and converts it to unicode.
+# Reader provides the following methods and attributes:
+#   reader.peek(length=1) - return the next `length` characters
+#   reader.forward(length=1) - move the current position to `length`
+#      characters.
+#   reader.index - the number of the current character.
+#   reader.line, stream.column - the line and the column of the current
+#      character.
+
+import codecs
+
+from ruamel.yaml.error import YAMLError, FileMark, StringMark, YAMLStreamError
+from ruamel.yaml.compat import _F  # NOQA
+from ruamel.yaml.util import RegExp
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Union, Text, Tuple, Optional  # NOQA
+#    from ruamel.yaml.compat import StreamTextType  # NOQA
+
+__all__ = ['Reader', 'ReaderError']
+
+
+class ReaderError(YAMLError):
+    def __init__(self, name, position, character, encoding, reason):
+        # type: (Any, Any, Any, Any, Any) -> None
+        self.name = name
+        self.character = character
+        self.position = position
+        self.encoding = encoding
+        self.reason = reason
+
+    def __str__(self):
+        # type: () -> Any
+        if isinstance(self.character, bytes):
+            return _F(
+                "'{self_encoding!s}' codec can't decode byte #x{ord_self_character:02x}: "
+                '{self_reason!s}\n'
+                '  in "{self_name!s}", position {self_position:d}',
+                self_encoding=self.encoding,
+                ord_self_character=ord(self.character),
+                self_reason=self.reason,
+                self_name=self.name,
+                self_position=self.position,
+            )
+        else:
+            return _F(
+                'unacceptable character #x{self_character:04x}: {self_reason!s}\n'
+                '  in "{self_name!s}", position {self_position:d}',
+                self_character=self.character,
+                self_reason=self.reason,
+                self_name=self.name,
+                self_position=self.position,
+            )
+
+
+class Reader:
+    # Reader:
+    # - determines the data encoding and converts it to a unicode string,
+    # - checks if characters are in allowed range,
+    # - adds '\0' to the end.
+
+    # Reader accepts
+    #  - a `bytes` object,
+    #  - a `str` object,
+    #  - a file-like object with its `read` method returning `str`,
+    #  - a file-like object with its `read` method returning `unicode`.
+
+    # Yeah, it's ugly and slow.
+
+    def __init__(self, stream, loader=None):
+        # type: (Any, Any) -> None
+        self.loader = loader
+        if self.loader is not None and getattr(self.loader, '_reader', None) is None:
+            self.loader._reader = self
+        self.reset_reader()
+        self.stream = stream  # type: Any  # as .read is called
+
+    def reset_reader(self):
+        # type: () -> None
+        self.name = None  # type: Any
+        self.stream_pointer = 0
+        self.eof = True
+        self.buffer = ""
+        self.pointer = 0
+        self.raw_buffer = None  # type: Any
+        self.raw_decode = None
+        self.encoding = None  # type: Optional[Text]
+        self.index = 0
+        self.line = 0
+        self.column = 0
+
+    @property
+    def stream(self):
+        # type: () -> Any
+        try:
+            return self._stream
+        except AttributeError:
+            raise YAMLStreamError('input stream needs to specified')
+
+    @stream.setter
+    def stream(self, val):
+        # type: (Any) -> None
+        if val is None:
+            return
+        self._stream = None
+        if isinstance(val, str):
+            self.name = '<unicode string>'
+            self.check_printable(val)
+            self.buffer = val + '\0'
+        elif isinstance(val, bytes):
+            self.name = '<byte string>'
+            self.raw_buffer = val
+            self.determine_encoding()
+        else:
+            if not hasattr(val, 'read'):
+                raise YAMLStreamError('stream argument needs to have a read() method')
+            self._stream = val
+            self.name = getattr(self.stream, 'name', '<file>')
+            self.eof = False
+            self.raw_buffer = None
+            self.determine_encoding()
+
+    def peek(self, index=0):
+        # type: (int) -> Text
+        try:
+            return self.buffer[self.pointer + index]
+        except IndexError:
+            self.update(index + 1)
+            return self.buffer[self.pointer + index]
+
+    def prefix(self, length=1):
+        # type: (int) -> Any
+        if self.pointer + length >= len(self.buffer):
+            self.update(length)
+        return self.buffer[self.pointer : self.pointer + length]
+
+    def forward_1_1(self, length=1):
+        # type: (int) -> None
+        if self.pointer + length + 1 >= len(self.buffer):
+            self.update(length + 1)
+        while length != 0:
+            ch = self.buffer[self.pointer]
+            self.pointer += 1
+            self.index += 1
+            if ch in '\n\x85\u2028\u2029' or (
+                ch == '\r' and self.buffer[self.pointer] != '\n'
+            ):
+                self.line += 1
+                self.column = 0
+            elif ch != '\uFEFF':
+                self.column += 1
+            length -= 1
+
+    def forward(self, length=1):
+        # type: (int) -> None
+        if self.pointer + length + 1 >= len(self.buffer):
+            self.update(length + 1)
+        while length != 0:
+            ch = self.buffer[self.pointer]
+            self.pointer += 1
+            self.index += 1
+            if ch == '\n' or (ch == '\r' and self.buffer[self.pointer] != '\n'):
+                self.line += 1
+                self.column = 0
+            elif ch != '\uFEFF':
+                self.column += 1
+            length -= 1
+
+    def get_mark(self):
+        # type: () -> Any
+        if self.stream is None:
+            return StringMark(
+                self.name, self.index, self.line, self.column, self.buffer, self.pointer
+            )
+        else:
+            return FileMark(self.name, self.index, self.line, self.column)
+
+    def determine_encoding(self):
+        # type: () -> None
+        while not self.eof and (self.raw_buffer is None or len(self.raw_buffer) < 2):
+            self.update_raw()
+        if isinstance(self.raw_buffer, bytes):
+            if self.raw_buffer.startswith(codecs.BOM_UTF16_LE):
+                self.raw_decode = codecs.utf_16_le_decode  # type: ignore
+                self.encoding = 'utf-16-le'
+            elif self.raw_buffer.startswith(codecs.BOM_UTF16_BE):
+                self.raw_decode = codecs.utf_16_be_decode  # type: ignore
+                self.encoding = 'utf-16-be'
+            else:
+                self.raw_decode = codecs.utf_8_decode  # type: ignore
+                self.encoding = 'utf-8'
+        self.update(1)
+
+    NON_PRINTABLE = RegExp(
+        '[^\x09\x0A\x0D\x20-\x7E\x85' '\xA0-\uD7FF' '\uE000-\uFFFD' '\U00010000-\U0010FFFF' ']'
+    )
+
+    _printable_ascii = ('\x09\x0A\x0D' + "".join(map(chr, range(0x20, 0x7F)))).encode('ascii')
+
+    @classmethod
+    def _get_non_printable_ascii(cls, data):  # type: ignore
+        # type: (Text, bytes) -> Optional[Tuple[int, Text]]
+        ascii_bytes = data.encode('ascii')  # type: ignore
+        non_printables = ascii_bytes.translate(None, cls._printable_ascii)  # type: ignore
+        if not non_printables:
+            return None
+        non_printable = non_printables[:1]
+        return ascii_bytes.index(non_printable), non_printable.decode('ascii')
+
+    @classmethod
+    def _get_non_printable_regex(cls, data):
+        # type: (Text) -> Optional[Tuple[int, Text]]
+        match = cls.NON_PRINTABLE.search(data)
+        if not bool(match):
+            return None
+        return match.start(), match.group()
+
+    @classmethod
+    def _get_non_printable(cls, data):
+        # type: (Text) -> Optional[Tuple[int, Text]]
+        try:
+            return cls._get_non_printable_ascii(data)  # type: ignore
+        except UnicodeEncodeError:
+            return cls._get_non_printable_regex(data)
+
+    def check_printable(self, data):
+        # type: (Any) -> None
+        non_printable_match = self._get_non_printable(data)
+        if non_printable_match is not None:
+            start, character = non_printable_match
+            position = self.index + (len(self.buffer) - self.pointer) + start
+            raise ReaderError(
+                self.name,
+                position,
+                ord(character),
+                'unicode',
+                'special characters are not allowed',
+            )
+
+    def update(self, length):
+        # type: (int) -> None
+        if self.raw_buffer is None:
+            return
+        self.buffer = self.buffer[self.pointer :]
+        self.pointer = 0
+        while len(self.buffer) < length:
+            if not self.eof:
+                self.update_raw()
+            if self.raw_decode is not None:
+                try:
+                    data, converted = self.raw_decode(self.raw_buffer, 'strict', self.eof)
+                except UnicodeDecodeError as exc:
+                    character = self.raw_buffer[exc.start]
+                    if self.stream is not None:
+                        position = self.stream_pointer - len(self.raw_buffer) + exc.start
+                    elif self.stream is not None:
+                        position = self.stream_pointer - len(self.raw_buffer) + exc.start
+                    else:
+                        position = exc.start
+                    raise ReaderError(self.name, position, character, exc.encoding, exc.reason)
+            else:
+                data = self.raw_buffer
+                converted = len(data)
+            self.check_printable(data)
+            self.buffer += data
+            self.raw_buffer = self.raw_buffer[converted:]
+            if self.eof:
+                self.buffer += '\0'
+                self.raw_buffer = None
+                break
+
+    def update_raw(self, size=None):
+        # type: (Optional[int]) -> None
+        if size is None:
+            size = 4096
+        data = self.stream.read(size)
+        if self.raw_buffer is None:
+            self.raw_buffer = data
+        else:
+            self.raw_buffer += data
+        self.stream_pointer += len(data)
+        if not data:
+            self.eof = True
+
+
+# try:
+#     import psyco
+#     psyco.bind(Reader)
+# except ImportError:
+#     pass

lib/spack/external/_vendoring/ruamel/yaml/resolver.py

@@ -1,54 +1,166 @@
 # coding: utf-8
 
-from __future__ import absolute_import
-
 import re
 
-try:
-    from .error import *                               # NOQA
-    from .nodes import *                               # NOQA
-    from .compat import string_types
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.error import *                               # NOQA
-    from ruamel.yaml.nodes import *                               # NOQA
-    from ruamel.yaml.compat import string_types
+if False:  # MYPY
+    from typing import Any, Dict, List, Union, Text, Optional  # NOQA
+    from ruamel.yaml.compat import VersionType  # NOQA
+
+from ruamel.yaml.compat import _DEFAULT_YAML_VERSION, _F  # NOQA
+from ruamel.yaml.error import *  # NOQA
+from ruamel.yaml.nodes import MappingNode, ScalarNode, SequenceNode  # NOQA
+from ruamel.yaml.util import RegExp  # NOQA
 
 __all__ = ['BaseResolver', 'Resolver', 'VersionedResolver']
 
 
-_DEFAULT_VERSION = (1, 2)
+# fmt: off
+# resolvers consist of
+# - a list of applicable version
+# - a tag
+# - a regexp
+# - a list of first characters to match
+implicit_resolvers = [
+    ([(1, 2)],
+        'tag:yaml.org,2002:bool',
+        RegExp('''^(?:true|True|TRUE|false|False|FALSE)$''', re.X),
+        list('tTfF')),
+    ([(1, 1)],
+        'tag:yaml.org,2002:bool',
+        RegExp('''^(?:y|Y|yes|Yes|YES|n|N|no|No|NO
+        |true|True|TRUE|false|False|FALSE
+        |on|On|ON|off|Off|OFF)$''', re.X),
+        list('yYnNtTfFoO')),
+    ([(1, 2)],
+        'tag:yaml.org,2002:float',
+        RegExp('''^(?:
+         [-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?
+        |[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)
+        |[-+]?\\.[0-9_]+(?:[eE][-+][0-9]+)?
+        |[-+]?\\.(?:inf|Inf|INF)
+        |\\.(?:nan|NaN|NAN))$''', re.X),
+        list('-+0123456789.')),
+    ([(1, 1)],
+        'tag:yaml.org,2002:float',
+        RegExp('''^(?:
+         [-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?
+        |[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)
+        |\\.[0-9_]+(?:[eE][-+][0-9]+)?
+        |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*  # sexagesimal float
+        |[-+]?\\.(?:inf|Inf|INF)
+        |\\.(?:nan|NaN|NAN))$''', re.X),
+        list('-+0123456789.')),
+    ([(1, 2)],
+        'tag:yaml.org,2002:int',
+        RegExp('''^(?:[-+]?0b[0-1_]+
+        |[-+]?0o?[0-7_]+
+        |[-+]?[0-9_]+
+        |[-+]?0x[0-9a-fA-F_]+)$''', re.X),
+        list('-+0123456789')),
+    ([(1, 1)],
+        'tag:yaml.org,2002:int',
+        RegExp('''^(?:[-+]?0b[0-1_]+
+        |[-+]?0?[0-7_]+
+        |[-+]?(?:0|[1-9][0-9_]*)
+        |[-+]?0x[0-9a-fA-F_]+
+        |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),  # sexagesimal int
+        list('-+0123456789')),
+    ([(1, 2), (1, 1)],
+        'tag:yaml.org,2002:merge',
+        RegExp('^(?:<<)$'),
+        ['<']),
+    ([(1, 2), (1, 1)],
+        'tag:yaml.org,2002:null',
+        RegExp('''^(?: ~
+        |null|Null|NULL
+        | )$''', re.X),
+        ['~', 'n', 'N', '']),
+    ([(1, 2), (1, 1)],
+        'tag:yaml.org,2002:timestamp',
+        RegExp('''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
+        |[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
+        (?:[Tt]|[ \\t]+)[0-9][0-9]?
+        :[0-9][0-9] :[0-9][0-9] (?:\\.[0-9]*)?
+        (?:[ \\t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
+        list('0123456789')),
+    ([(1, 2), (1, 1)],
+        'tag:yaml.org,2002:value',
+        RegExp('^(?:=)$'),
+        ['=']),
+    # The following resolver is only for documentation purposes. It cannot work
+    # because plain scalars cannot start with '!', '&', or '*'.
+    ([(1, 2), (1, 1)],
+        'tag:yaml.org,2002:yaml',
+        RegExp('^(?:!|&|\\*)$'),
+        list('!&*')),
+]
+# fmt: on
 
 
 class ResolverError(YAMLError):
     pass
 
 
-class BaseResolver(object):
+class BaseResolver:
 
-    DEFAULT_SCALAR_TAG = u'tag:yaml.org,2002:str'
-    DEFAULT_SEQUENCE_TAG = u'tag:yaml.org,2002:seq'
-    DEFAULT_MAPPING_TAG = u'tag:yaml.org,2002:map'
+    DEFAULT_SCALAR_TAG = 'tag:yaml.org,2002:str'
+    DEFAULT_SEQUENCE_TAG = 'tag:yaml.org,2002:seq'
+    DEFAULT_MAPPING_TAG = 'tag:yaml.org,2002:map'
 
-    yaml_implicit_resolvers = {}
-    yaml_path_resolvers = {}
+    yaml_implicit_resolvers = {}  # type: Dict[Any, Any]
+    yaml_path_resolvers = {}  # type: Dict[Any, Any]
 
-    def __init__(self):
-        self._loader_version = None
-        self.resolver_exact_paths = []
-        self.resolver_prefix_paths = []
+    def __init__(self, loadumper=None):
+        # type: (Any, Any) -> None
+        self.loadumper = loadumper
+        if self.loadumper is not None and getattr(self.loadumper, '_resolver', None) is None:
+            self.loadumper._resolver = self.loadumper
+        self._loader_version = None  # type: Any
+        self.resolver_exact_paths = []  # type: List[Any]
+        self.resolver_prefix_paths = []  # type: List[Any]
+
+    @property
+    def parser(self):
+        # type: () -> Any
+        if self.loadumper is not None:
+            if hasattr(self.loadumper, 'typ'):
+                return self.loadumper.parser
+            return self.loadumper._parser
+        return None
 
     @classmethod
-    def add_implicit_resolver(cls, tag, regexp, first):
+    def add_implicit_resolver_base(cls, tag, regexp, first):
+        # type: (Any, Any, Any) -> None
         if 'yaml_implicit_resolvers' not in cls.__dict__:
-            cls.yaml_implicit_resolvers = cls.yaml_implicit_resolvers.copy()
+            # deepcopy doesn't work here
+            cls.yaml_implicit_resolvers = dict(
+                (k, cls.yaml_implicit_resolvers[k][:]) for k in cls.yaml_implicit_resolvers
+            )
         if first is None:
             first = [None]
         for ch in first:
-            cls.yaml_implicit_resolvers.setdefault(ch, []).append(
-                (tag, regexp))
+            cls.yaml_implicit_resolvers.setdefault(ch, []).append((tag, regexp))
+
+    @classmethod
+    def add_implicit_resolver(cls, tag, regexp, first):
+        # type: (Any, Any, Any) -> None
+        if 'yaml_implicit_resolvers' not in cls.__dict__:
+            # deepcopy doesn't work here
+            cls.yaml_implicit_resolvers = dict(
+                (k, cls.yaml_implicit_resolvers[k][:]) for k in cls.yaml_implicit_resolvers
+            )
+        if first is None:
+            first = [None]
+        for ch in first:
+            cls.yaml_implicit_resolvers.setdefault(ch, []).append((tag, regexp))
+        implicit_resolvers.append(([(1, 2), (1, 1)], tag, regexp, first))
+
+    # @classmethod
+    # def add_implicit_resolver(cls, tag, regexp, first):
 
     @classmethod
     def add_path_resolver(cls, tag, path, kind=None):
+        # type: (Any, Any, Any) -> None
         # Note: `add_path_resolver` is experimental.  The API could be changed.
         # `new_path` is a pattern that is matched against the path from the
         # root to the node that is being considered.  `node_path` elements are
@@ -63,7 +175,7 @@ def add_path_resolver(cls, tag, path, kind=None):
         # against a sequence value with the index equal to `index_check`.
         if 'yaml_path_resolvers' not in cls.__dict__:
             cls.yaml_path_resolvers = cls.yaml_path_resolvers.copy()
-        new_path = []
+        new_path = []  # type: List[Any]
         for element in path:
             if isinstance(element, (list, tuple)):
                 if len(element) == 2:
@@ -72,7 +184,9 @@ def add_path_resolver(cls, tag, path, kind=None):
                     node_check = element[0]
                     index_check = True
                 else:
-                    raise ResolverError("Invalid path element: %s" % element)
+                    raise ResolverError(
+                        _F('Invalid path element: {element!s}', element=element)
+                    )
             else:
                 node_check = None
                 index_check = element
@@ -82,13 +196,18 @@ def add_path_resolver(cls, tag, path, kind=None):
                 node_check = SequenceNode
             elif node_check is dict:
                 node_check = MappingNode
-            elif node_check not in [ScalarNode, SequenceNode, MappingNode]  \
-                    and not isinstance(node_check, string_types)  \
-                    and node_check is not None:
-                raise ResolverError("Invalid node checker: %s" % node_check)
-            if not isinstance(index_check, (string_types, int))   \
-                    and index_check is not None:
-                raise ResolverError("Invalid index checker: %s" % index_check)
+            elif (
+                node_check not in [ScalarNode, SequenceNode, MappingNode]
+                and not isinstance(node_check, str)
+                and node_check is not None
+            ):
+                raise ResolverError(
+                    _F('Invalid node checker: {node_check!s}', node_check=node_check)
+                )
+            if not isinstance(index_check, (str, int)) and index_check is not None:
+                raise ResolverError(
+                    _F('Invalid index checker: {index_check!s}', index_check=index_check)
+                )
             new_path.append((node_check, index_check))
         if kind is str:
             kind = ScalarNode
@@ -96,12 +215,12 @@ def add_path_resolver(cls, tag, path, kind=None):
             kind = SequenceNode
         elif kind is dict:
             kind = MappingNode
-        elif kind not in [ScalarNode, SequenceNode, MappingNode]    \
-                and kind is not None:
-            raise ResolverError("Invalid node kind: %s" % kind)
+        elif kind not in [ScalarNode, SequenceNode, MappingNode] and kind is not None:
+            raise ResolverError(_F('Invalid node kind: {kind!s}', kind=kind))
         cls.yaml_path_resolvers[tuple(new_path), kind] = tag
 
     def descend_resolver(self, current_node, current_index):
+        # type: (Any, Any) -> None
         if not self.yaml_path_resolvers:
             return
         exact_paths = {}
@@ -109,13 +228,11 @@ def descend_resolver(self, current_node, current_index):
         if current_node:
             depth = len(self.resolver_prefix_paths)
             for path, kind in self.resolver_prefix_paths[-1]:
-                if self.check_resolver_prefix(depth, path, kind,
-                                              current_node, current_index):
+                if self.check_resolver_prefix(depth, path, kind, current_node, current_index):
                     if len(path) > depth:
                         prefix_paths.append((path, kind))
                     else:
-                        exact_paths[kind] = self.yaml_path_resolvers[path,
-                                                                     kind]
+                        exact_paths[kind] = self.yaml_path_resolvers[path, kind]
         else:
             for path, kind in self.yaml_path_resolvers:
                 if not path:
@@ -126,39 +243,40 @@ def descend_resolver(self, current_node, current_index):
         self.resolver_prefix_paths.append(prefix_paths)
 
     def ascend_resolver(self):
+        # type: () -> None
         if not self.yaml_path_resolvers:
             return
         self.resolver_exact_paths.pop()
         self.resolver_prefix_paths.pop()
 
-    def check_resolver_prefix(self, depth, path, kind,
-                              current_node, current_index):
-        node_check, index_check = path[depth-1]
-        if isinstance(node_check, string_types):
+    def check_resolver_prefix(self, depth, path, kind, current_node, current_index):
+        # type: (int, Any, Any, Any, Any) -> bool
+        node_check, index_check = path[depth - 1]
+        if isinstance(node_check, str):
             if current_node.tag != node_check:
-                return
+                return False
         elif node_check is not None:
             if not isinstance(current_node, node_check):
-                return
+                return False
         if index_check is True and current_index is not None:
-            return
-        if (index_check is False or index_check is None)    \
-                and current_index is None:
-            return
-        if isinstance(index_check, string_types):
-            if not (isinstance(current_index, ScalarNode) and
-                    index_check == current_index.value):
-                return
-        elif isinstance(index_check, int) and not isinstance(index_check,
-                                                             bool):
+            return False
+        if (index_check is False or index_check is None) and current_index is None:
+            return False
+        if isinstance(index_check, str):
+            if not (
+                isinstance(current_index, ScalarNode) and index_check == current_index.value
+            ):
+                return False
+        elif isinstance(index_check, int) and not isinstance(index_check, bool):
             if index_check != current_index:
-                return
+                return False
         return True
 
     def resolve(self, kind, value, implicit):
+        # type: (Any, Any, Any) -> Any
         if kind is ScalarNode and implicit[0]:
-            if value == u'':
-                resolvers = self.yaml_implicit_resolvers.get(u'', [])
+            if value == "":
+                resolvers = self.yaml_implicit_resolvers.get("", [])
             else:
                 resolvers = self.yaml_implicit_resolvers.get(value[0], [])
             resolvers += self.yaml_implicit_resolvers.get(None, [])
@@ -166,7 +284,7 @@ def resolve(self, kind, value, implicit):
                 if regexp.match(value):
                     return tag
             implicit = implicit[1]
-        if self.yaml_path_resolvers:
+        if bool(self.yaml_path_resolvers):
             exact_paths = self.resolver_exact_paths[-1]
             if kind in exact_paths:
                 return exact_paths[kind]
@@ -181,158 +299,37 @@ def resolve(self, kind, value, implicit):
 
     @property
     def processing_version(self):
+        # type: () -> Any
         return None
 
 
 class Resolver(BaseResolver):
     pass
 
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:bool',
-    re.compile(u'''^(?:yes|Yes|YES|no|No|NO
-    |true|True|TRUE|false|False|FALSE
-    |on|On|ON|off|Off|OFF)$''', re.X),
-    list(u'yYnNtTfFoO'))
 
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:float',
-    re.compile(u'''^(?:
-     [-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?
-    |[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)
-    |\\.[0-9_]+(?:[eE][-+][0-9]+)?
-    |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*
-    |[-+]?\\.(?:inf|Inf|INF)
-    |\\.(?:nan|NaN|NAN))$''', re.X),
-    list(u'-+0123456789.'))
-
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:int',
-    re.compile(u'''^(?:[-+]?0b[0-1_]+
-    |[-+]?0o?[0-7_]+
-    |[-+]?(?:0|[1-9][0-9_]*)
-    |[-+]?0x[0-9a-fA-F_]+
-    |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
-    list(u'-+0123456789'))
-
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:merge',
-    re.compile(u'^(?:<<)$'),
-    [u'<'])
-
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:null',
-    re.compile(u'''^(?: ~
-    |null|Null|NULL
-    | )$''', re.X),
-    [u'~', u'n', u'N', u''])
-
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:timestamp',
-    re.compile(u'''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
-    |[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
-    (?:[Tt]|[ \\t]+)[0-9][0-9]?
-    :[0-9][0-9] :[0-9][0-9] (?:\\.[0-9]*)?
-    (?:[ \\t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
-    list(u'0123456789'))
-
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:value',
-    re.compile(u'^(?:=)$'),
-    [u'='])
-
-# The following resolver is only for documentation purposes. It cannot work
-# because plain scalars cannot start with '!', '&', or '*'.
-Resolver.add_implicit_resolver(
-    u'tag:yaml.org,2002:yaml',
-    re.compile(u'^(?:!|&|\\*)$'),
-    list(u'!&*'))
-
-# resolvers consist of
-# - a list of applicable version
-# - a tag
-# - a regexp
-# - a list of first characters to match
-implicit_resolvers = [
-    ([(1, 2)],
-        u'tag:yaml.org,2002:bool',
-        re.compile(u'''^(?:true|True|TRUE|false|False|FALSE)$''', re.X),
-        list(u'tTfF')),
-    ([(1, 1)],
-        u'tag:yaml.org,2002:bool',
-        re.compile(u'''^(?:yes|Yes|YES|no|No|NO
-        |true|True|TRUE|false|False|FALSE
-        |on|On|ON|off|Off|OFF)$''', re.X),
-        list(u'yYnNtTfFoO')),
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:float',
-        re.compile(u'''^(?:
-         [-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+]?[0-9]+)?
-        |[-+]?(?:[0-9][0-9_]*)(?:[eE][-+]?[0-9]+)
-        |\\.[0-9_]+(?:[eE][-+][0-9]+)?
-        |[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*
-        |[-+]?\\.(?:inf|Inf|INF)
-        |\\.(?:nan|NaN|NAN))$''', re.X),
-        list(u'-+0123456789.')),
-    ([(1, 2)],
-        u'tag:yaml.org,2002:int',
-        re.compile(u'''^(?:[-+]?0b[0-1_]+
-        |[-+]?0o?[0-7_]+
-        |[-+]?(?:0|[1-9][0-9_]*)
-        |[-+]?0x[0-9a-fA-F_]+)$''', re.X),
-        list(u'-+0123456789')),
-    ([(1, 1)],
-        u'tag:yaml.org,2002:int',
-        re.compile(u'''^(?:[-+]?0b[0-1_]+
-        |[-+]?0o?[0-7_]+
-        |[-+]?(?:0|[1-9][0-9_]*)
-        |[-+]?0x[0-9a-fA-F_]+
-        |[-+]?[1-9][0-9_]*(?::[0-5]?[0-9])+)$''', re.X),
-        list(u'-+0123456789')),
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:merge',
-        re.compile(u'^(?:<<)$'),
-        [u'<']),
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:null',
-        re.compile(u'''^(?: ~
-        |null|Null|NULL
-        | )$''', re.X),
-        [u'~', u'n', u'N', u'']),
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:timestamp',
-        re.compile(u'''^(?:[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]
-        |[0-9][0-9][0-9][0-9] -[0-9][0-9]? -[0-9][0-9]?
-        (?:[Tt]|[ \\t]+)[0-9][0-9]?
-        :[0-9][0-9] :[0-9][0-9] (?:\\.[0-9]*)?
-        (?:[ \\t]*(?:Z|[-+][0-9][0-9]?(?::[0-9][0-9])?))?)$''', re.X),
-        list(u'0123456789')),
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:value',
-        re.compile(u'^(?:=)$'),
-        [u'=']),
-    # The following resolver is only for documentation purposes. It cannot work
-    # because plain scalars cannot start with '!', '&', or '*'.
-    ([(1, 2), (1, 1)],
-        u'tag:yaml.org,2002:yaml',
-        re.compile(u'^(?:!|&|\\*)$'),
-        list(u'!&*')),
-]
+for ir in implicit_resolvers:
+    if (1, 2) in ir[0]:
+        Resolver.add_implicit_resolver_base(*ir[1:])
 
 
 class VersionedResolver(BaseResolver):
     """
     contrary to the "normal" resolver, the smart resolver delays loading
     the pattern matching rules. That way it can decide to load 1.1 rules
-    or the (default) 1.2 that no longer support octal without 0o, sexagesimals
+    or the (default) 1.2 rules, that no longer support octal without 0o, sexagesimals
     and Yes/No/On/Off booleans.
     """
 
-    def __init__(self, version=None):
-        BaseResolver.__init__(self)
+    def __init__(self, version=None, loader=None, loadumper=None):
+        # type: (Optional[VersionType], Any, Any) -> None
+        if loader is None and loadumper is not None:
+            loader = loadumper
+        BaseResolver.__init__(self, loader)
         self._loader_version = self.get_loader_version(version)
-        self._version_implicit_resolver = {}
+        self._version_implicit_resolver = {}  # type: Dict[Any, Any]
 
     def add_version_implicit_resolver(self, version, tag, regexp, first):
+        # type: (VersionType, Any, Any, Any) -> None
         if first is None:
             first = [None]
         impl_resolver = self._version_implicit_resolver.setdefault(version, {})
@@ -340,19 +337,23 @@ def add_version_implicit_resolver(self, version, tag, regexp, first):
             impl_resolver.setdefault(ch, []).append((tag, regexp))
 
     def get_loader_version(self, version):
+        # type: (Optional[VersionType]) -> Any
         if version is None or isinstance(version, tuple):
             return version
         if isinstance(version, list):
             return tuple(version)
         # assume string
-        return tuple(map(int, version.split(u'.')))
+        return tuple(map(int, version.split('.')))
 
     @property
-    def resolver(self):
+    def versioned_resolver(self):
+        # type: () -> Any
         """
         select the resolver based on the version we are parsing
         """
         version = self.processing_version
+        if isinstance(version, str):
+            version = tuple(map(int, version.split('.')))
         if version not in self._version_implicit_resolver:
             for x in implicit_resolvers:
                 if version in x[0]:
@@ -360,17 +361,18 @@ def resolver(self):
         return self._version_implicit_resolver[version]
 
     def resolve(self, kind, value, implicit):
+        # type: (Any, Any, Any) -> Any
         if kind is ScalarNode and implicit[0]:
-            if value == u'':
-                resolvers = self.resolver.get(u'', [])
+            if value == "":
+                resolvers = self.versioned_resolver.get("", [])
             else:
-                resolvers = self.resolver.get(value[0], [])
-            resolvers += self.resolver.get(None, [])
+                resolvers = self.versioned_resolver.get(value[0], [])
+            resolvers += self.versioned_resolver.get(None, [])
             for tag, regexp in resolvers:
                 if regexp.match(value):
                     return tag
             implicit = implicit[1]
-        if self.yaml_path_resolvers:
+        if bool(self.yaml_path_resolvers):
             exact_paths = self.resolver_exact_paths[-1]
             if kind in exact_paths:
                 return exact_paths[kind]
@@ -385,13 +387,19 @@ def resolve(self, kind, value, implicit):
 
     @property
     def processing_version(self):
+        # type: () -> Any
         try:
-            version = self.yaml_version
+            version = self.loadumper._scanner.yaml_version
         except AttributeError:
-            # dumping
-            version = self.use_version
+            try:
+                if hasattr(self.loadumper, 'typ'):
+                    version = self.loadumper.version
+                else:
+                    version = self.loadumper._serializer.use_version  # dumping
+            except AttributeError:
+                version = None
         if version is None:
             version = self._loader_version
             if version is None:
-                version = _DEFAULT_VERSION
+                version = _DEFAULT_YAML_VERSION
         return version

lib/spack/external/_vendoring/ruamel/yaml/scalarbool.py

@@ -0,0 +1,47 @@
+# coding: utf-8
+
+"""
+You cannot subclass bool, and this is necessary for round-tripping anchored
+bool values (and also if you want to preserve the original way of writing)
+
+bool.__bases__ is type 'int', so that is what is used as the basis for ScalarBoolean as well.
+
+You can use these in an if statement, but not when testing equivalence
+"""
+
+from ruamel.yaml.anchor import Anchor
+
+if False:  # MYPY
+    from typing import Text, Any, Dict, List  # NOQA
+
+__all__ = ['ScalarBoolean']
+
+
+class ScalarBoolean(int):
+    def __new__(cls, *args, **kw):
+        # type: (Any, Any, Any) -> Any
+        anchor = kw.pop('anchor', None)
+        b = int.__new__(cls, *args, **kw)
+        if anchor is not None:
+            b.yaml_set_anchor(anchor, always_dump=True)
+        return b
+
+    @property
+    def anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            setattr(self, Anchor.attrib, Anchor())
+        return getattr(self, Anchor.attrib)
+
+    def yaml_anchor(self, any=False):
+        # type: (bool) -> Any
+        if not hasattr(self, Anchor.attrib):
+            return None
+        if any or self.anchor.always_dump:
+            return self.anchor
+        return None
+
+    def yaml_set_anchor(self, value, always_dump=False):
+        # type: (Any, bool) -> None
+        self.anchor.value = value
+        self.anchor.always_dump = always_dump

lib/spack/external/_vendoring/ruamel/yaml/scalarfloat.py

@@ -0,0 +1,124 @@
+# coding: utf-8
+
+import sys
+from ruamel.yaml.anchor import Anchor
+
+if False:  # MYPY
+    from typing import Text, Any, Dict, List  # NOQA
+
+__all__ = ['ScalarFloat', 'ExponentialFloat', 'ExponentialCapsFloat']
+
+
+class ScalarFloat(float):
+    def __new__(cls, *args, **kw):
+        # type: (Any, Any, Any) -> Any
+        width = kw.pop('width', None)
+        prec = kw.pop('prec', None)
+        m_sign = kw.pop('m_sign', None)
+        m_lead0 = kw.pop('m_lead0', 0)
+        exp = kw.pop('exp', None)
+        e_width = kw.pop('e_width', None)
+        e_sign = kw.pop('e_sign', None)
+        underscore = kw.pop('underscore', None)
+        anchor = kw.pop('anchor', None)
+        v = float.__new__(cls, *args, **kw)
+        v._width = width
+        v._prec = prec
+        v._m_sign = m_sign
+        v._m_lead0 = m_lead0
+        v._exp = exp
+        v._e_width = e_width
+        v._e_sign = e_sign
+        v._underscore = underscore
+        if anchor is not None:
+            v.yaml_set_anchor(anchor, always_dump=True)
+        return v
+
+    def __iadd__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        return float(self) + a
+        x = type(self)(self + a)
+        x._width = self._width
+        x._underscore = self._underscore[:] if self._underscore is not None else None  # NOQA
+        return x
+
+    def __ifloordiv__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        return float(self) // a
+        x = type(self)(self // a)
+        x._width = self._width
+        x._underscore = self._underscore[:] if self._underscore is not None else None  # NOQA
+        return x
+
+    def __imul__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        return float(self) * a
+        x = type(self)(self * a)
+        x._width = self._width
+        x._underscore = self._underscore[:] if self._underscore is not None else None  # NOQA
+        x._prec = self._prec  # check for others
+        return x
+
+    def __ipow__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        return float(self) ** a
+        x = type(self)(self ** a)
+        x._width = self._width
+        x._underscore = self._underscore[:] if self._underscore is not None else None  # NOQA
+        return x
+
+    def __isub__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        return float(self) - a
+        x = type(self)(self - a)
+        x._width = self._width
+        x._underscore = self._underscore[:] if self._underscore is not None else None  # NOQA
+        return x
+
+    @property
+    def anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            setattr(self, Anchor.attrib, Anchor())
+        return getattr(self, Anchor.attrib)
+
+    def yaml_anchor(self, any=False):
+        # type: (bool) -> Any
+        if not hasattr(self, Anchor.attrib):
+            return None
+        if any or self.anchor.always_dump:
+            return self.anchor
+        return None
+
+    def yaml_set_anchor(self, value, always_dump=False):
+        # type: (Any, bool) -> None
+        self.anchor.value = value
+        self.anchor.always_dump = always_dump
+
+    def dump(self, out=sys.stdout):
+        # type: (Any) -> Any
+        out.write(
+            'ScalarFloat({}| w:{}, p:{}, s:{}, lz:{}, _:{}|{}, w:{}, s:{})\n'.format(
+                self,
+                self._width,  # type: ignore
+                self._prec,  # type: ignore
+                self._m_sign,  # type: ignore
+                self._m_lead0,  # type: ignore
+                self._underscore,  # type: ignore
+                self._exp,  # type: ignore
+                self._e_width,  # type: ignore
+                self._e_sign,  # type: ignore
+            )
+        )
+
+
+class ExponentialFloat(ScalarFloat):
+    def __new__(cls, value, width=None, underscore=None):
+        # type: (Any, Any, Any) -> Any
+        return ScalarFloat.__new__(cls, value, width=width, underscore=underscore)
+
+
+class ExponentialCapsFloat(ScalarFloat):
+    def __new__(cls, value, width=None, underscore=None):
+        # type: (Any, Any, Any) -> Any
+        return ScalarFloat.__new__(cls, value, width=width, underscore=underscore)

lib/spack/external/_vendoring/ruamel/yaml/scalarint.py

@@ -0,0 +1,127 @@
+# coding: utf-8
+
+from ruamel.yaml.anchor import Anchor
+
+if False:  # MYPY
+    from typing import Text, Any, Dict, List  # NOQA
+
+__all__ = ['ScalarInt', 'BinaryInt', 'OctalInt', 'HexInt', 'HexCapsInt', 'DecimalInt']
+
+
+class ScalarInt(int):
+    def __new__(cls, *args, **kw):
+        # type: (Any, Any, Any) -> Any
+        width = kw.pop('width', None)
+        underscore = kw.pop('underscore', None)
+        anchor = kw.pop('anchor', None)
+        v = int.__new__(cls, *args, **kw)
+        v._width = width
+        v._underscore = underscore
+        if anchor is not None:
+            v.yaml_set_anchor(anchor, always_dump=True)
+        return v
+
+    def __iadd__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        x = type(self)(self + a)
+        x._width = self._width  # type: ignore
+        x._underscore = (  # type: ignore
+            self._underscore[:] if self._underscore is not None else None  # type: ignore
+        )  # NOQA
+        return x
+
+    def __ifloordiv__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        x = type(self)(self // a)
+        x._width = self._width  # type: ignore
+        x._underscore = (  # type: ignore
+            self._underscore[:] if self._underscore is not None else None  # type: ignore
+        )  # NOQA
+        return x
+
+    def __imul__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        x = type(self)(self * a)
+        x._width = self._width  # type: ignore
+        x._underscore = (  # type: ignore
+            self._underscore[:] if self._underscore is not None else None  # type: ignore
+        )  # NOQA
+        return x
+
+    def __ipow__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        x = type(self)(self ** a)
+        x._width = self._width  # type: ignore
+        x._underscore = (  # type: ignore
+            self._underscore[:] if self._underscore is not None else None  # type: ignore
+        )  # NOQA
+        return x
+
+    def __isub__(self, a):  # type: ignore
+        # type: (Any) -> Any
+        x = type(self)(self - a)
+        x._width = self._width  # type: ignore
+        x._underscore = (  # type: ignore
+            self._underscore[:] if self._underscore is not None else None  # type: ignore
+        )  # NOQA
+        return x
+
+    @property
+    def anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            setattr(self, Anchor.attrib, Anchor())
+        return getattr(self, Anchor.attrib)
+
+    def yaml_anchor(self, any=False):
+        # type: (bool) -> Any
+        if not hasattr(self, Anchor.attrib):
+            return None
+        if any or self.anchor.always_dump:
+            return self.anchor
+        return None
+
+    def yaml_set_anchor(self, value, always_dump=False):
+        # type: (Any, bool) -> None
+        self.anchor.value = value
+        self.anchor.always_dump = always_dump
+
+
+class BinaryInt(ScalarInt):
+    def __new__(cls, value, width=None, underscore=None, anchor=None):
+        # type: (Any, Any, Any, Any) -> Any
+        return ScalarInt.__new__(cls, value, width=width, underscore=underscore, anchor=anchor)
+
+
+class OctalInt(ScalarInt):
+    def __new__(cls, value, width=None, underscore=None, anchor=None):
+        # type: (Any, Any, Any, Any) -> Any
+        return ScalarInt.__new__(cls, value, width=width, underscore=underscore, anchor=anchor)
+
+
+# mixed casing of A-F is not supported, when loading the first non digit
+# determines the case
+
+
+class HexInt(ScalarInt):
+    """uses lower case (a-f)"""
+
+    def __new__(cls, value, width=None, underscore=None, anchor=None):
+        # type: (Any, Any, Any, Any) -> Any
+        return ScalarInt.__new__(cls, value, width=width, underscore=underscore, anchor=anchor)
+
+
+class HexCapsInt(ScalarInt):
+    """uses upper case (A-F)"""
+
+    def __new__(cls, value, width=None, underscore=None, anchor=None):
+        # type: (Any, Any, Any, Any) -> Any
+        return ScalarInt.__new__(cls, value, width=width, underscore=underscore, anchor=anchor)
+
+
+class DecimalInt(ScalarInt):
+    """needed if anchor"""
+
+    def __new__(cls, value, width=None, underscore=None, anchor=None):
+        # type: (Any, Any, Any, Any) -> Any
+        return ScalarInt.__new__(cls, value, width=width, underscore=underscore, anchor=anchor)

lib/spack/external/_vendoring/ruamel/yaml/scalarstring.py

@@ -0,0 +1,152 @@
+# coding: utf-8
+
+from ruamel.yaml.anchor import Anchor
+
+if False:  # MYPY
+    from typing import Text, Any, Dict, List  # NOQA
+
+__all__ = [
+    'ScalarString',
+    'LiteralScalarString',
+    'FoldedScalarString',
+    'SingleQuotedScalarString',
+    'DoubleQuotedScalarString',
+    'PlainScalarString',
+    # PreservedScalarString is the old name, as it was the first to be preserved on rt,
+    # use LiteralScalarString instead
+    'PreservedScalarString',
+]
+
+
+class ScalarString(str):
+    __slots__ = Anchor.attrib
+
+    def __new__(cls, *args, **kw):
+        # type: (Any, Any) -> Any
+        anchor = kw.pop('anchor', None)
+        ret_val = str.__new__(cls, *args, **kw)
+        if anchor is not None:
+            ret_val.yaml_set_anchor(anchor, always_dump=True)
+        return ret_val
+
+    def replace(self, old, new, maxreplace=-1):
+        # type: (Any, Any, int) -> Any
+        return type(self)((str.replace(self, old, new, maxreplace)))
+
+    @property
+    def anchor(self):
+        # type: () -> Any
+        if not hasattr(self, Anchor.attrib):
+            setattr(self, Anchor.attrib, Anchor())
+        return getattr(self, Anchor.attrib)
+
+    def yaml_anchor(self, any=False):
+        # type: (bool) -> Any
+        if not hasattr(self, Anchor.attrib):
+            return None
+        if any or self.anchor.always_dump:
+            return self.anchor
+        return None
+
+    def yaml_set_anchor(self, value, always_dump=False):
+        # type: (Any, bool) -> None
+        self.anchor.value = value
+        self.anchor.always_dump = always_dump
+
+
+class LiteralScalarString(ScalarString):
+    __slots__ = 'comment'  # the comment after the | on the first line
+
+    style = '|'
+
+    def __new__(cls, value, anchor=None):
+        # type: (Text, Any) -> Any
+        return ScalarString.__new__(cls, value, anchor=anchor)
+
+
+PreservedScalarString = LiteralScalarString
+
+
+class FoldedScalarString(ScalarString):
+    __slots__ = ('fold_pos', 'comment')  # the comment after the > on the first line
+
+    style = '>'
+
+    def __new__(cls, value, anchor=None):
+        # type: (Text, Any) -> Any
+        return ScalarString.__new__(cls, value, anchor=anchor)
+
+
+class SingleQuotedScalarString(ScalarString):
+    __slots__ = ()
+
+    style = "'"
+
+    def __new__(cls, value, anchor=None):
+        # type: (Text, Any) -> Any
+        return ScalarString.__new__(cls, value, anchor=anchor)
+
+
+class DoubleQuotedScalarString(ScalarString):
+    __slots__ = ()
+
+    style = '"'
+
+    def __new__(cls, value, anchor=None):
+        # type: (Text, Any) -> Any
+        return ScalarString.__new__(cls, value, anchor=anchor)
+
+
+class PlainScalarString(ScalarString):
+    __slots__ = ()
+
+    style = ''
+
+    def __new__(cls, value, anchor=None):
+        # type: (Text, Any) -> Any
+        return ScalarString.__new__(cls, value, anchor=anchor)
+
+
+def preserve_literal(s):
+    # type: (Text) -> Text
+    return LiteralScalarString(s.replace('\r\n', '\n').replace('\r', '\n'))
+
+
+def walk_tree(base, map=None):
+    # type: (Any, Any) -> None
+    """
+    the routine here walks over a simple yaml tree (recursing in
+    dict values and list items) and converts strings that
+    have multiple lines to literal scalars
+
+    You can also provide an explicit (ordered) mapping for multiple transforms
+    (first of which is executed):
+        map = ruamel.yaml.compat.ordereddict
+        map['\n'] = preserve_literal
+        map[':'] = SingleQuotedScalarString
+        walk_tree(data, map=map)
+    """
+    from collections.abc import MutableMapping, MutableSequence
+
+    if map is None:
+        map = {'\n': preserve_literal}
+
+    if isinstance(base, MutableMapping):
+        for k in base:
+            v = base[k]  # type: Text
+            if isinstance(v, str):
+                for ch in map:
+                    if ch in v:
+                        base[k] = map[ch](v)
+                        break
+            else:
+                walk_tree(v, map=map)
+    elif isinstance(base, MutableSequence):
+        for idx, elem in enumerate(base):
+            if isinstance(elem, str):
+                for ch in map:
+                    if ch in elem:
+                        base[idx] = map[ch](elem)
+                        break
+            else:
+                walk_tree(elem, map=map)

lib/spack/external/_vendoring/ruamel/yaml/serializer.py

@@ -0,0 +1,241 @@
+# coding: utf-8
+
+from ruamel.yaml.error import YAMLError
+from ruamel.yaml.compat import nprint, DBG_NODE, dbg, nprintf  # NOQA
+from ruamel.yaml.util import RegExp
+
+from ruamel.yaml.events import (
+    StreamStartEvent,
+    StreamEndEvent,
+    MappingStartEvent,
+    MappingEndEvent,
+    SequenceStartEvent,
+    SequenceEndEvent,
+    AliasEvent,
+    ScalarEvent,
+    DocumentStartEvent,
+    DocumentEndEvent,
+)
+from ruamel.yaml.nodes import MappingNode, ScalarNode, SequenceNode
+
+if False:  # MYPY
+    from typing import Any, Dict, Union, Text, Optional  # NOQA
+    from ruamel.yaml.compat import VersionType  # NOQA
+
+__all__ = ['Serializer', 'SerializerError']
+
+
+class SerializerError(YAMLError):
+    pass
+
+
+class Serializer:
+
+    # 'id' and 3+ numbers, but not 000
+    ANCHOR_TEMPLATE = 'id%03d'
+    ANCHOR_RE = RegExp('id(?!000$)\\d{3,}')
+
+    def __init__(
+        self,
+        encoding=None,
+        explicit_start=None,
+        explicit_end=None,
+        version=None,
+        tags=None,
+        dumper=None,
+    ):
+        # type: (Any, Optional[bool], Optional[bool], Optional[VersionType], Any, Any) -> None  # NOQA
+        self.dumper = dumper
+        if self.dumper is not None:
+            self.dumper._serializer = self
+        self.use_encoding = encoding
+        self.use_explicit_start = explicit_start
+        self.use_explicit_end = explicit_end
+        if isinstance(version, str):
+            self.use_version = tuple(map(int, version.split('.')))
+        else:
+            self.use_version = version  # type: ignore
+        self.use_tags = tags
+        self.serialized_nodes = {}  # type: Dict[Any, Any]
+        self.anchors = {}  # type: Dict[Any, Any]
+        self.last_anchor_id = 0
+        self.closed = None  # type: Optional[bool]
+        self._templated_id = None
+
+    @property
+    def emitter(self):
+        # type: () -> Any
+        if hasattr(self.dumper, 'typ'):
+            return self.dumper.emitter
+        return self.dumper._emitter
+
+    @property
+    def resolver(self):
+        # type: () -> Any
+        if hasattr(self.dumper, 'typ'):
+            self.dumper.resolver
+        return self.dumper._resolver
+
+    def open(self):
+        # type: () -> None
+        if self.closed is None:
+            self.emitter.emit(StreamStartEvent(encoding=self.use_encoding))
+            self.closed = False
+        elif self.closed:
+            raise SerializerError('serializer is closed')
+        else:
+            raise SerializerError('serializer is already opened')
+
+    def close(self):
+        # type: () -> None
+        if self.closed is None:
+            raise SerializerError('serializer is not opened')
+        elif not self.closed:
+            self.emitter.emit(StreamEndEvent())
+            self.closed = True
+
+    # def __del__(self):
+    #     self.close()
+
+    def serialize(self, node):
+        # type: (Any) -> None
+        if dbg(DBG_NODE):
+            nprint('Serializing nodes')
+            node.dump()
+        if self.closed is None:
+            raise SerializerError('serializer is not opened')
+        elif self.closed:
+            raise SerializerError('serializer is closed')
+        self.emitter.emit(
+            DocumentStartEvent(
+                explicit=self.use_explicit_start, version=self.use_version, tags=self.use_tags
+            )
+        )
+        self.anchor_node(node)
+        self.serialize_node(node, None, None)
+        self.emitter.emit(DocumentEndEvent(explicit=self.use_explicit_end))
+        self.serialized_nodes = {}
+        self.anchors = {}
+        self.last_anchor_id = 0
+
+    def anchor_node(self, node):
+        # type: (Any) -> None
+        if node in self.anchors:
+            if self.anchors[node] is None:
+                self.anchors[node] = self.generate_anchor(node)
+        else:
+            anchor = None
+            try:
+                if node.anchor.always_dump:
+                    anchor = node.anchor.value
+            except:  # NOQA
+                pass
+            self.anchors[node] = anchor
+            if isinstance(node, SequenceNode):
+                for item in node.value:
+                    self.anchor_node(item)
+            elif isinstance(node, MappingNode):
+                for key, value in node.value:
+                    self.anchor_node(key)
+                    self.anchor_node(value)
+
+    def generate_anchor(self, node):
+        # type: (Any) -> Any
+        try:
+            anchor = node.anchor.value
+        except:  # NOQA
+            anchor = None
+        if anchor is None:
+            self.last_anchor_id += 1
+            return self.ANCHOR_TEMPLATE % self.last_anchor_id
+        return anchor
+
+    def serialize_node(self, node, parent, index):
+        # type: (Any, Any, Any) -> None
+        alias = self.anchors[node]
+        if node in self.serialized_nodes:
+            node_style = getattr(node, 'style', None)
+            if node_style != '?':
+                node_style = None
+            self.emitter.emit(AliasEvent(alias, style=node_style))
+        else:
+            self.serialized_nodes[node] = True
+            self.resolver.descend_resolver(parent, index)
+            if isinstance(node, ScalarNode):
+                # here check if the node.tag equals the one that would result from parsing
+                # if not equal quoting is necessary for strings
+                detected_tag = self.resolver.resolve(ScalarNode, node.value, (True, False))
+                default_tag = self.resolver.resolve(ScalarNode, node.value, (False, True))
+                implicit = (
+                    (node.tag == detected_tag),
+                    (node.tag == default_tag),
+                    node.tag.startswith('tag:yaml.org,2002:'),
+                )
+                self.emitter.emit(
+                    ScalarEvent(
+                        alias,
+                        node.tag,
+                        implicit,
+                        node.value,
+                        style=node.style,
+                        comment=node.comment,
+                    )
+                )
+            elif isinstance(node, SequenceNode):
+                implicit = node.tag == self.resolver.resolve(SequenceNode, node.value, True)
+                comment = node.comment
+                end_comment = None
+                seq_comment = None
+                if node.flow_style is True:
+                    if comment:  # eol comment on flow style sequence
+                        seq_comment = comment[0]
+                        # comment[0] = None
+                if comment and len(comment) > 2:
+                    end_comment = comment[2]
+                else:
+                    end_comment = None
+                self.emitter.emit(
+                    SequenceStartEvent(
+                        alias,
+                        node.tag,
+                        implicit,
+                        flow_style=node.flow_style,
+                        comment=node.comment,
+                    )
+                )
+                index = 0
+                for item in node.value:
+                    self.serialize_node(item, node, index)
+                    index += 1
+                self.emitter.emit(SequenceEndEvent(comment=[seq_comment, end_comment]))
+            elif isinstance(node, MappingNode):
+                implicit = node.tag == self.resolver.resolve(MappingNode, node.value, True)
+                comment = node.comment
+                end_comment = None
+                map_comment = None
+                if node.flow_style is True:
+                    if comment:  # eol comment on flow style sequence
+                        map_comment = comment[0]
+                        # comment[0] = None
+                if comment and len(comment) > 2:
+                    end_comment = comment[2]
+                self.emitter.emit(
+                    MappingStartEvent(
+                        alias,
+                        node.tag,
+                        implicit,
+                        flow_style=node.flow_style,
+                        comment=node.comment,
+                        nr_items=len(node.value),
+                    )
+                )
+                for key, value in node.value:
+                    self.serialize_node(key, node, None)
+                    self.serialize_node(value, node, key)
+                self.emitter.emit(MappingEndEvent(comment=[map_comment, end_comment]))
+            self.resolver.ascend_resolver()
+
+
+def templated_id(s):
+    # type: (Text) -> Any
+    return Serializer.ANCHOR_RE.match(s)

lib/spack/external/_vendoring/ruamel/yaml/timestamp.py

@@ -0,0 +1,61 @@
+# coding: utf-8
+
+import datetime
+import copy
+
+# ToDo: at least on PY3 you could probably attach the tzinfo correctly to the object
+#       a more complete datetime might be used by safe loading as well
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List  # NOQA
+
+
+class TimeStamp(datetime.datetime):
+    def __init__(self, *args, **kw):
+        # type: (Any, Any) -> None
+        self._yaml = dict(t=False, tz=None, delta=0)  # type: Dict[Any, Any]
+
+    def __new__(cls, *args, **kw):  # datetime is immutable
+        # type: (Any, Any) -> Any
+        return datetime.datetime.__new__(cls, *args, **kw)
+
+    def __deepcopy__(self, memo):
+        # type: (Any) -> Any
+        ts = TimeStamp(self.year, self.month, self.day, self.hour, self.minute, self.second)
+        ts._yaml = copy.deepcopy(self._yaml)
+        return ts
+
+    def replace(
+        self,
+        year=None,
+        month=None,
+        day=None,
+        hour=None,
+        minute=None,
+        second=None,
+        microsecond=None,
+        tzinfo=True,
+        fold=None,
+    ):
+        # type: (Any, Any, Any, Any, Any, Any, Any, Any, Any) -> Any
+        if year is None:
+            year = self.year
+        if month is None:
+            month = self.month
+        if day is None:
+            day = self.day
+        if hour is None:
+            hour = self.hour
+        if minute is None:
+            minute = self.minute
+        if second is None:
+            second = self.second
+        if microsecond is None:
+            microsecond = self.microsecond
+        if tzinfo is True:
+            tzinfo = self.tzinfo
+        if fold is None:
+            fold = self.fold
+        ts = type(self)(year, month, day, hour, minute, second, microsecond, tzinfo, fold=fold)
+        ts._yaml = copy.deepcopy(self._yaml)
+        return ts

lib/spack/external/_vendoring/ruamel/yaml/tokens.py

@@ -0,0 +1,404 @@
+# coding: utf-8
+
+from ruamel.yaml.compat import _F, nprintf  # NOQA
+
+if False:  # MYPY
+    from typing import Text, Any, Dict, Optional, List  # NOQA
+    from .error import StreamMark  # NOQA
+
+SHOW_LINES = True
+
+
+class Token:
+    __slots__ = 'start_mark', 'end_mark', '_comment'
+
+    def __init__(self, start_mark, end_mark):
+        # type: (StreamMark, StreamMark) -> None
+        self.start_mark = start_mark
+        self.end_mark = end_mark
+
+    def __repr__(self):
+        # type: () -> Any
+        # attributes = [key for key in self.__slots__ if not key.endswith('_mark') and
+        #               hasattr('self', key)]
+        attributes = [key for key in self.__slots__ if not key.endswith('_mark')]
+        attributes.sort()
+        # arguments = ', '.join(
+        #  [_F('{key!s}={gattr!r})', key=key, gattr=getattr(self, key)) for key in attributes]
+        # )
+        arguments = [
+            _F('{key!s}={gattr!r}', key=key, gattr=getattr(self, key)) for key in attributes
+        ]
+        if SHOW_LINES:
+            try:
+                arguments.append('line: ' + str(self.start_mark.line))
+            except:  # NOQA
+                pass
+        try:
+            arguments.append('comment: ' + str(self._comment))
+        except:  # NOQA
+            pass
+        return '{}({})'.format(self.__class__.__name__, ', '.join(arguments))
+
+    @property
+    def column(self):
+        # type: () -> int
+        return self.start_mark.column
+
+    @column.setter
+    def column(self, pos):
+        # type: (Any) -> None
+        self.start_mark.column = pos
+
+    # old style ( <= 0.17) is a TWO element list with first being the EOL
+    # comment concatenated with following FLC/BLNK; and second being a list of FLC/BLNK
+    # preceding the token
+    # new style ( >= 0.17 ) is a THREE element list with the first being a list of
+    # preceding FLC/BLNK, the second EOL and the third following FLC/BLNK
+    # note that new style has differing order, and does not consist of CommentToken(s)
+    # but of CommentInfo instances
+    # any non-assigned values in new style are None, but first and last can be empty list
+    # new style routines add one comment at a time
+
+    # going to be deprecated in favour of add_comment_eol/post
+    def add_post_comment(self, comment):
+        # type: (Any) -> None
+        if not hasattr(self, '_comment'):
+            self._comment = [None, None]
+        else:
+            assert len(self._comment) in [2, 5]  # make sure it is version 0
+        # if isinstance(comment, CommentToken):
+        #    if comment.value.startswith('# C09'):
+        #        raise
+        self._comment[0] = comment
+
+    # going to be deprecated in favour of add_comment_pre
+    def add_pre_comments(self, comments):
+        # type: (Any) -> None
+        if not hasattr(self, '_comment'):
+            self._comment = [None, None]
+        else:
+            assert len(self._comment) == 2  # make sure it is version 0
+        assert self._comment[1] is None
+        self._comment[1] = comments
+        return
+
+    # new style
+    def add_comment_pre(self, comment):
+        # type: (Any) -> None
+        if not hasattr(self, '_comment'):
+            self._comment = [[], None, None]  # type: ignore
+        else:
+            assert len(self._comment) == 3
+            if self._comment[0] is None:
+                self._comment[0] = []  # type: ignore
+        self._comment[0].append(comment)  # type: ignore
+
+    def add_comment_eol(self, comment, comment_type):
+        # type: (Any, Any) -> None
+        if not hasattr(self, '_comment'):
+            self._comment = [None, None, None]
+        else:
+            assert len(self._comment) == 3
+            assert self._comment[1] is None
+        if self.comment[1] is None:
+            self._comment[1] = []  # type: ignore
+        self._comment[1].extend([None] * (comment_type + 1 - len(self.comment[1])))  # type: ignore # NOQA
+        # nprintf('commy', self.comment, comment_type)
+        self._comment[1][comment_type] = comment  # type: ignore
+
+    def add_comment_post(self, comment):
+        # type: (Any) -> None
+        if not hasattr(self, '_comment'):
+            self._comment = [None, None, []]  # type: ignore
+        else:
+            assert len(self._comment) == 3
+            if self._comment[2] is None:
+                self._comment[2] = []  # type: ignore
+        self._comment[2].append(comment)  # type: ignore
+
+    # def get_comment(self):
+    #     # type: () -> Any
+    #     return getattr(self, '_comment', None)
+
+    @property
+    def comment(self):
+        # type: () -> Any
+        return getattr(self, '_comment', None)
+
+    def move_old_comment(self, target, empty=False):
+        # type: (Any, bool) -> Any
+        """move a comment from this token to target (normally next token)
+        used to combine e.g. comments before a BlockEntryToken to the
+        ScalarToken that follows it
+        empty is a special for empty values -> comment after key
+        """
+        c = self.comment
+        if c is None:
+            return
+        # don't push beyond last element
+        if isinstance(target, (StreamEndToken, DocumentStartToken)):
+            return
+        delattr(self, '_comment')
+        tc = target.comment
+        if not tc:  # target comment, just insert
+            # special for empty value in key: value issue 25
+            if empty:
+                c = [c[0], c[1], None, None, c[0]]
+            target._comment = c
+            # nprint('mco2:', self, target, target.comment, empty)
+            return self
+        if c[0] and tc[0] or c[1] and tc[1]:
+            raise NotImplementedError(_F('overlap in comment {c!r} {tc!r}', c=c, tc=tc))
+        if c[0]:
+            tc[0] = c[0]
+        if c[1]:
+            tc[1] = c[1]
+        return self
+
+    def split_old_comment(self):
+        # type: () -> Any
+        """ split the post part of a comment, and return it
+        as comment to be added. Delete second part if [None, None]
+         abc:  # this goes to sequence
+           # this goes to first element
+           - first element
+        """
+        comment = self.comment
+        if comment is None or comment[0] is None:
+            return None  # nothing to do
+        ret_val = [comment[0], None]
+        if comment[1] is None:
+            delattr(self, '_comment')
+        return ret_val
+
+    def move_new_comment(self, target, empty=False):
+        # type: (Any, bool) -> Any
+        """move a comment from this token to target (normally next token)
+        used to combine e.g. comments before a BlockEntryToken to the
+        ScalarToken that follows it
+        empty is a special for empty values -> comment after key
+        """
+        c = self.comment
+        if c is None:
+            return
+        # don't push beyond last element
+        if isinstance(target, (StreamEndToken, DocumentStartToken)):
+            return
+        delattr(self, '_comment')
+        tc = target.comment
+        if not tc:  # target comment, just insert
+            # special for empty value in key: value issue 25
+            if empty:
+                c = [c[0], c[1], c[2]]
+            target._comment = c
+            # nprint('mco2:', self, target, target.comment, empty)
+            return self
+        # if self and target have both pre, eol or post comments, something seems wrong
+        for idx in range(3):
+            if c[idx] is not None and tc[idx] is not None:
+                raise NotImplementedError(_F('overlap in comment {c!r} {tc!r}', c=c, tc=tc))
+        # move the comment parts
+        for idx in range(3):
+            if c[idx]:
+                tc[idx] = c[idx]
+        return self
+
+
+# class BOMToken(Token):
+#     id = '<byte order mark>'
+
+
+class DirectiveToken(Token):
+    __slots__ = 'name', 'value'
+    id = '<directive>'
+
+    def __init__(self, name, value, start_mark, end_mark):
+        # type: (Any, Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.name = name
+        self.value = value
+
+
+class DocumentStartToken(Token):
+    __slots__ = ()
+    id = '<document start>'
+
+
+class DocumentEndToken(Token):
+    __slots__ = ()
+    id = '<document end>'
+
+
+class StreamStartToken(Token):
+    __slots__ = ('encoding',)
+    id = '<stream start>'
+
+    def __init__(self, start_mark=None, end_mark=None, encoding=None):
+        # type: (Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.encoding = encoding
+
+
+class StreamEndToken(Token):
+    __slots__ = ()
+    id = '<stream end>'
+
+
+class BlockSequenceStartToken(Token):
+    __slots__ = ()
+    id = '<block sequence start>'
+
+
+class BlockMappingStartToken(Token):
+    __slots__ = ()
+    id = '<block mapping start>'
+
+
+class BlockEndToken(Token):
+    __slots__ = ()
+    id = '<block end>'
+
+
+class FlowSequenceStartToken(Token):
+    __slots__ = ()
+    id = '['
+
+
+class FlowMappingStartToken(Token):
+    __slots__ = ()
+    id = '{'
+
+
+class FlowSequenceEndToken(Token):
+    __slots__ = ()
+    id = ']'
+
+
+class FlowMappingEndToken(Token):
+    __slots__ = ()
+    id = '}'
+
+
+class KeyToken(Token):
+    __slots__ = ()
+    id = '?'
+
+    # def x__repr__(self):
+    #     return 'KeyToken({})'.format(
+    #         self.start_mark.buffer[self.start_mark.index:].split(None, 1)[0])
+
+
+class ValueToken(Token):
+    __slots__ = ()
+    id = ':'
+
+
+class BlockEntryToken(Token):
+    __slots__ = ()
+    id = '-'
+
+
+class FlowEntryToken(Token):
+    __slots__ = ()
+    id = ','
+
+
+class AliasToken(Token):
+    __slots__ = ('value',)
+    id = '<alias>'
+
+    def __init__(self, value, start_mark, end_mark):
+        # type: (Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.value = value
+
+
+class AnchorToken(Token):
+    __slots__ = ('value',)
+    id = '<anchor>'
+
+    def __init__(self, value, start_mark, end_mark):
+        # type: (Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.value = value
+
+
+class TagToken(Token):
+    __slots__ = ('value',)
+    id = '<tag>'
+
+    def __init__(self, value, start_mark, end_mark):
+        # type: (Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.value = value
+
+
+class ScalarToken(Token):
+    __slots__ = 'value', 'plain', 'style'
+    id = '<scalar>'
+
+    def __init__(self, value, plain, start_mark, end_mark, style=None):
+        # type: (Any, Any, Any, Any, Any) -> None
+        Token.__init__(self, start_mark, end_mark)
+        self.value = value
+        self.plain = plain
+        self.style = style
+
+
+class CommentToken(Token):
+    __slots__ = '_value', 'pre_done'
+    id = '<comment>'
+
+    def __init__(self, value, start_mark=None, end_mark=None, column=None):
+        # type: (Any, Any, Any, Any) -> None
+        if start_mark is None:
+            assert column is not None
+            self._column = column
+        Token.__init__(self, start_mark, None)  # type: ignore
+        self._value = value
+
+    @property
+    def value(self):
+        # type: () -> str
+        if isinstance(self._value, str):
+            return self._value
+        return "".join(self._value)
+
+    @value.setter
+    def value(self, val):
+        # type: (Any) -> None
+        self._value = val
+
+    def reset(self):
+        # type: () -> None
+        if hasattr(self, 'pre_done'):
+            delattr(self, 'pre_done')
+
+    def __repr__(self):
+        # type: () -> Any
+        v = '{!r}'.format(self.value)
+        if SHOW_LINES:
+            try:
+                v += ', line: ' + str(self.start_mark.line)
+            except:  # NOQA
+                pass
+            try:
+                v += ', col: ' + str(self.start_mark.column)
+            except:  # NOQA
+                pass
+        return 'CommentToken({})'.format(v)
+
+    def __eq__(self, other):
+        # type: (Any) -> bool
+        if self.start_mark != other.start_mark:
+            return False
+        if self.end_mark != other.end_mark:
+            return False
+        if self.value != other.value:
+            return False
+        return True
+
+    def __ne__(self, other):
+        # type: (Any) -> bool
+        return not self.__eq__(other)

lib/spack/external/_vendoring/ruamel/yaml/util.py

@@ -0,0 +1,256 @@
+# coding: utf-8
+
+"""
+some helper functions that might be generally useful
+"""
+
+import datetime
+from functools import partial
+import re
+
+
+if False:  # MYPY
+    from typing import Any, Dict, Optional, List, Text  # NOQA
+    from .compat import StreamTextType  # NOQA
+
+
+class LazyEval:
+    """
+    Lightweight wrapper around lazily evaluated func(*args, **kwargs).
+
+    func is only evaluated when any attribute of its return value is accessed.
+    Every attribute access is passed through to the wrapped value.
+    (This only excludes special cases like method-wrappers, e.g., __hash__.)
+    The sole additional attribute is the lazy_self function which holds the
+    return value (or, prior to evaluation, func and arguments), in its closure.
+    """
+
+    def __init__(self, func, *args, **kwargs):
+        # type: (Any, Any, Any) -> None
+        def lazy_self():
+            # type: () -> Any
+            return_value = func(*args, **kwargs)
+            object.__setattr__(self, 'lazy_self', lambda: return_value)
+            return return_value
+
+        object.__setattr__(self, 'lazy_self', lazy_self)
+
+    def __getattribute__(self, name):
+        # type: (Any) -> Any
+        lazy_self = object.__getattribute__(self, 'lazy_self')
+        if name == 'lazy_self':
+            return lazy_self
+        return getattr(lazy_self(), name)
+
+    def __setattr__(self, name, value):
+        # type: (Any, Any) -> None
+        setattr(self.lazy_self(), name, value)
+
+
+RegExp = partial(LazyEval, re.compile)
+
+timestamp_regexp = RegExp(
+    """^(?P<year>[0-9][0-9][0-9][0-9])
+       -(?P<month>[0-9][0-9]?)
+       -(?P<day>[0-9][0-9]?)
+       (?:((?P<t>[Tt])|[ \\t]+)   # explictly not retaining extra spaces
+       (?P<hour>[0-9][0-9]?)
+       :(?P<minute>[0-9][0-9])
+       :(?P<second>[0-9][0-9])
+       (?:\\.(?P<fraction>[0-9]*))?
+        (?:[ \\t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?)
+       (?::(?P<tz_minute>[0-9][0-9]))?))?)?$""",
+    re.X,
+)
+
+
+def create_timestamp(
+    year, month, day, t, hour, minute, second, fraction, tz, tz_sign, tz_hour, tz_minute
+):
+    # type: (Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) -> Any
+    # create a timestamp from match against timestamp_regexp
+    MAX_FRAC = 999999
+    year = int(year)
+    month = int(month)
+    day = int(day)
+    if not hour:
+        return datetime.date(year, month, day)
+    hour = int(hour)
+    minute = int(minute)
+    second = int(second)
+    frac = 0
+    if fraction:
+        frac_s = fraction[:6]
+        while len(frac_s) < 6:
+            frac_s += '0'
+        frac = int(frac_s)
+        if len(fraction) > 6 and int(fraction[6]) > 4:
+            frac += 1
+        if frac > MAX_FRAC:
+            fraction = 0
+        else:
+            fraction = frac
+    else:
+        fraction = 0
+    delta = None
+    if tz_sign:
+        tz_hour = int(tz_hour)
+        tz_minute = int(tz_minute) if tz_minute else 0
+        delta = datetime.timedelta(
+            hours=tz_hour, minutes=tz_minute, seconds=1 if frac > MAX_FRAC else 0
+        )
+        if tz_sign == '-':
+            delta = -delta
+    elif frac > MAX_FRAC:
+        delta = -datetime.timedelta(seconds=1)
+    # should do something else instead (or hook this up to the preceding if statement
+    # in reverse
+    #  if delta is None:
+    #      return datetime.datetime(year, month, day, hour, minute, second, fraction)
+    #  return datetime.datetime(year, month, day, hour, minute, second, fraction,
+    #                           datetime.timezone.utc)
+    # the above is not good enough though, should provide tzinfo. In Python3 that is easily
+    # doable drop that kind of support for Python2 as it has not native tzinfo
+    data = datetime.datetime(year, month, day, hour, minute, second, fraction)
+    if delta:
+        data -= delta
+    return data
+
+
+# originally as comment
+# https://github.com/pre-commit/pre-commit/pull/211#issuecomment-186466605
+# if you use this in your code, I suggest adding a test in your test suite
+# that check this routines output against a known piece of your YAML
+# before upgrades to this code break your round-tripped YAML
+def load_yaml_guess_indent(stream, **kw):
+    # type: (StreamTextType, Any) -> Any
+    """guess the indent and block sequence indent of yaml stream/string
+
+    returns round_trip_loaded stream, indent level, block sequence indent
+    - block sequence indent is the number of spaces before a dash relative to previous indent
+    - if there are no block sequences, indent is taken from nested mappings, block sequence
+      indent is unset (None) in that case
+    """
+    from .main import YAML
+
+    # load a YAML document, guess the indentation, if you use TABs you are on your own
+    def leading_spaces(line):
+        # type: (Any) -> int
+        idx = 0
+        while idx < len(line) and line[idx] == ' ':
+            idx += 1
+        return idx
+
+    if isinstance(stream, str):
+        yaml_str = stream  # type: Any
+    elif isinstance(stream, bytes):
+        # most likely, but the Reader checks BOM for this
+        yaml_str = stream.decode('utf-8')
+    else:
+        yaml_str = stream.read()
+    map_indent = None
+    indent = None  # default if not found for some reason
+    block_seq_indent = None
+    prev_line_key_only = None
+    key_indent = 0
+    for line in yaml_str.splitlines():
+        rline = line.rstrip()
+        lline = rline.lstrip()
+        if lline.startswith('- '):
+            l_s = leading_spaces(line)
+            block_seq_indent = l_s - key_indent
+            idx = l_s + 1
+            while line[idx] == ' ':  # this will end as we rstripped
+                idx += 1
+            if line[idx] == '#':  # comment after -
+                continue
+            indent = idx - key_indent
+            break
+        if map_indent is None and prev_line_key_only is not None and rline:
+            idx = 0
+            while line[idx] in ' -':
+                idx += 1
+            if idx > prev_line_key_only:
+                map_indent = idx - prev_line_key_only
+        if rline.endswith(':'):
+            key_indent = leading_spaces(line)
+            idx = 0
+            while line[idx] == ' ':  # this will end on ':'
+                idx += 1
+            prev_line_key_only = idx
+            continue
+        prev_line_key_only = None
+    if indent is None and map_indent is not None:
+        indent = map_indent
+    yaml = YAML()
+    return yaml.load(yaml_str, **kw), indent, block_seq_indent  # type: ignore
+
+
+def configobj_walker(cfg):
+    # type: (Any) -> Any
+    """
+    walks over a ConfigObj (INI file with comments) generating
+    corresponding YAML output (including comments
+    """
+    from configobj import ConfigObj  # type: ignore
+
+    assert isinstance(cfg, ConfigObj)
+    for c in cfg.initial_comment:
+        if c.strip():
+            yield c
+    for s in _walk_section(cfg):
+        if s.strip():
+            yield s
+    for c in cfg.final_comment:
+        if c.strip():
+            yield c
+
+
+def _walk_section(s, level=0):
+    # type: (Any, int) -> Any
+    from configobj import Section
+
+    assert isinstance(s, Section)
+    indent = '  ' * level
+    for name in s.scalars:
+        for c in s.comments[name]:
+            yield indent + c.strip()
+        x = s[name]
+        if '\n' in x:
+            i = indent + '  '
+            x = '|\n' + i + x.strip().replace('\n', '\n' + i)
+        elif ':' in x:
+            x = "'" + x.replace("'", "''") + "'"
+        line = '{0}{1}: {2}'.format(indent, name, x)
+        c = s.inline_comments[name]
+        if c:
+            line += ' ' + c
+        yield line
+    for name in s.sections:
+        for c in s.comments[name]:
+            yield indent + c.strip()
+        line = '{0}{1}:'.format(indent, name)
+        c = s.inline_comments[name]
+        if c:
+            line += ' ' + c
+        yield line
+        for val in _walk_section(s[name], level=level + 1):
+            yield val
+
+
+# def config_obj_2_rt_yaml(cfg):
+#     from .comments import CommentedMap, CommentedSeq
+#     from configobj import ConfigObj
+#     assert isinstance(cfg, ConfigObj)
+#     #for c in cfg.initial_comment:
+#     #    if c.strip():
+#     #        pass
+#     cm = CommentedMap()
+#     for name in s.sections:
+#         cm[name] = d = CommentedMap()
+#
+#
+#     #for c in cfg.final_comment:
+#     #    if c.strip():
+#     #        yield c
+#     return cm

lib/spack/external/ruamel/yaml/.ruamel/__init__.py

@@ -1,2 +0,0 @@
-import pkg_resources
-pkg_resources.declare_namespace(__name__)

lib/spack/external/ruamel/yaml/README.rst

@@ -1,38 +0,0 @@
-
-ruamel.yaml
-===========
-
-``ruamel.yaml`` is a YAML 1.2 loader/dumper package for Python.
-
-* `Overview <http://yaml.readthedocs.org/en/latest/overview.html>`_
-* `Installing <http://yaml.readthedocs.org/en/latest/install.html>`_
-* `Details <http://yaml.readthedocs.org/en/latest/detail.html>`_
-* `Examples <http://yaml.readthedocs.org/en/latest/example.html>`_
-* `Differences with PyYAML <http://yaml.readthedocs.org/en/latest/pyyaml.html>`_
-
-.. image:: https://readthedocs.org/projects/yaml/badge/?version=stable
-   :target: https://yaml.readthedocs.org/en/stable
-
-ChangeLog
-=========
-
-::
-
-  0.11.15 (2016-XX-XX):
-    - Change to prevent FutureWarning in NumPy, as reported by tgehring
-    ("comparison to None will result in an elementwise object comparison in the future")
-
-  0.11.14 (2016-07-06):
-    - fix preserve_quotes missing on original Loaders (as reported
-      by Leynos, bitbucket issue 38)
-
-  0.11.13 (2016-07-06):
-    - documentation only, automated linux wheels
-
-  0.11.12 (2016-07-06):
-    - added support for roundtrip of single/double quoted scalars using:
-      ruamel.yaml.round_trip_load(stream, preserve_quotes=True)
-
-  0.11.0 (2016-02-18):
-    - RoundTripLoader loads 1.2 by default (no sexagesimals, 012 octals nor
-      yes/no/on/off booleans

lib/spack/external/ruamel/yaml/__init__.py

@@ -1,85 +0,0 @@
-# coding: utf-8
-
-from __future__ import print_function
-from __future__ import absolute_import
-
-# install_requires of ruamel.base is not really required but the old
-# ruamel.base installed __init__.py, and thus a new version should
-# be installed at some point
-
-_package_data = dict(
-    full_package_name="ruamel.yaml",
-    version_info=(0, 11, 15),
-    author="Anthon van der Neut",
-    author_email="a.van.der.neut@ruamel.eu",
-    description="ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order",  # NOQA
-    entry_points=None,
-    install_requires=dict(
-        any=[],
-        py26=["ruamel.ordereddict"],
-        py27=["ruamel.ordereddict"]
-    ),
-    ext_modules=[dict(
-        name="_ruamel_yaml",
-        src=["ext/_ruamel_yaml.c", "ext/api.c", "ext/writer.c", "ext/dumper.c",
-                "ext/loader.c", "ext/reader.c", "ext/scanner.c", "ext/parser.c",
-                "ext/emitter.c"],
-        lib=[],
-        # test='#include "ext/yaml.h"\n\nint main(int argc, char* argv[])\n{\nyaml_parser_t parser;\nparser = parser;  /* prevent warning */\nreturn 0;\n}\n'  # NOQA
-        )
-    ],
-    classifiers=[
-        "Programming Language :: Python :: 2.6",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.3",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
-        "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
-        "Programming Language :: Python :: Implementation :: Jython",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-        "Topic :: Text Processing :: Markup"
-    ],
-    windows_wheels=True,
-    read_the_docs='yaml',
-    many_linux='libyaml-devel',
-)
-
-
-# < from ruamel.util.new import _convert_version
-def _convert_version(tup):
-    """create a PEP 386 pseudo-format conformant string from tuple tup"""
-    ret_val = str(tup[0])  # first is always digit
-    next_sep = "."  # separator for next extension, can be "" or "."
-    for x in tup[1:]:
-        if isinstance(x, int):
-            ret_val += next_sep + str(x)
-            next_sep = '.'
-            continue
-        first_letter = x[0].lower()
-        next_sep = ''
-        if first_letter in 'abcr':
-            ret_val += 'rc' if first_letter == 'r' else first_letter
-        elif first_letter in 'pd':
-            ret_val += '.post' if first_letter == 'p' else '.dev'
-    return ret_val
-
-
-# <
-version_info = _package_data['version_info']
-__version__ = _convert_version(version_info)
-
-del _convert_version
-
-try:
-    from .cyaml import *                               # NOQA
-    __with_libyaml__ = True
-except (ImportError, ValueError):  # for Jython
-    __with_libyaml__ = False
-
-
-# body extracted to main.py
-try:
-    from .main import *                               # NOQA
-except ImportError:
-    from ruamel.yaml.main import *                               # NOQA

lib/spack/external/ruamel/yaml/comments.py

@@ -1,486 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-from __future__ import print_function
-
-"""
-stuff to deal with comments and formatting on dict/list/ordereddict/set
-these are not really related, formatting could be factored out as
-a separate base
-"""
-
-import sys
-
-if sys.version_info >= (3, 3):
-    from collections.abc import MutableSet
-else:
-    from collections import MutableSet
-
-__all__ = ["CommentedSeq", "CommentedMap", "CommentedOrderedMap",
-           "CommentedSet", 'comment_attrib', 'merge_attrib']
-
-
-try:
-    from .compat import ordereddict
-except ImportError:
-    from ruamel.yaml.compat import ordereddict
-
-comment_attrib = '_yaml_comment'
-format_attrib = '_yaml_format'
-line_col_attrib = '_yaml_line_col'
-anchor_attrib = '_yaml_anchor'
-merge_attrib = '_yaml_merge'
-tag_attrib = '_yaml_tag'
-
-
-class Comment(object):
-    # sys.getsize tested the Comment objects, __slots__ make them bigger
-    # and adding self.end did not matter
-    attrib = comment_attrib
-
-    def __init__(self):
-        self.comment = None  # [post, [pre]]
-        # map key (mapping/omap/dict) or index (sequence/list) to a  list of
-        # dict: post_key, pre_key, post_value, pre_value
-        # list: pre item, post item
-        self._items = {}
-        # self._start = [] # should not put these on first item
-        self._end = []  # end of document comments
-
-    def __str__(self):
-        if self._end:
-            end = ',\n  end=' + str(self._end)
-        else:
-            end = ''
-        return "Comment(comment={0},\n  items={1}{2})".format(
-            self.comment, self._items, end)
-
-    @property
-    def items(self):
-        return self._items
-
-    @property
-    def end(self):
-        return self._end
-
-    @end.setter
-    def end(self, value):
-        self._end = value
-
-    @property
-    def start(self):
-        return self._start
-
-    @start.setter
-    def start(self, value):
-        self._start = value
-
-
-# to distinguish key from None
-def NoComment():
-    pass
-
-
-class Format(object):
-    attrib = format_attrib
-
-    def __init__(self):
-        self._flow_style = None
-
-    def set_flow_style(self):
-        self._flow_style = True
-
-    def set_block_style(self):
-        self._flow_style = False
-
-    def flow_style(self, default=None):
-        """if default (the flow_style) is None, the flow style tacked on to
-        the object explicitly will be taken. If that is None as well the
-        default flow style rules the format down the line, or the type
-        of the constituent values (simple -> flow, map/list -> block)"""
-        if self._flow_style is None:
-            return default
-        return self._flow_style
-
-
-class LineCol(object):
-    attrib = line_col_attrib
-
-    def __init__(self):
-        self.line = None
-        self.col = None
-        self.data = None
-
-    def add_kv_line_col(self, key, data):
-        if self.data is None:
-            self.data = {}
-        self.data[key] = data
-
-    def key(self, k):
-        return self._kv(k, 0, 1)
-
-    def value(self, k):
-        return self._kv(k, 2, 3)
-
-    def _kv(self, k, x0, x1):
-        if self.data is None:
-            return None
-        data = self.data[k]
-        return data[x0], data[x1]
-
-    def item(self, idx):
-        if self.data is None:
-            return None
-        return self.data[idx][0], self.data[idx][1]
-
-    def add_idx_line_col(self, key, data):
-        if self.data is None:
-            self.data = {}
-        self.data[key] = data
-
-
-class Anchor(object):
-    attrib = anchor_attrib
-
-    def __init__(self):
-        self.value = None
-        self.always_dump = False
-
-
-class Tag(object):
-    """store tag information for roundtripping"""
-    attrib = tag_attrib
-
-    def __init__(self):
-        self.value = None
-
-
-class CommentedBase(object):
-    @property
-    def ca(self):
-        if not hasattr(self, Comment.attrib):
-            setattr(self, Comment.attrib, Comment())
-        return getattr(self, Comment.attrib)
-
-    def yaml_end_comment_extend(self, comment, clear=False):
-        if clear:
-            self.ca.end = []
-        self.ca.end.extend(comment)
-
-    def yaml_key_comment_extend(self, key, comment, clear=False):
-        l = self.ca._items.setdefault(key, [None, None, None, None])
-        if clear or l[1] is None:
-            if comment[1] is not None:
-                assert isinstance(comment[1], list)
-            l[1] = comment[1]
-        else:
-            l[1].extend(comment[0])
-        l[0] = comment[0]
-
-    def yaml_value_comment_extend(self, key, comment, clear=False):
-        l = self.ca._items.setdefault(key, [None, None, None, None])
-        if clear or l[3] is None:
-            if comment[1] is not None:
-                assert isinstance(comment[1], list)
-            l[3] = comment[1]
-        else:
-            l[3].extend(comment[0])
-        l[2] = comment[0]
-
-    def yaml_set_start_comment(self, comment, indent=0):
-        """overwrites any preceding comment lines on an object
-        expects comment to be without `#` and possible have mutlple lines
-        """
-        from .error import Mark
-        from .tokens import CommentToken
-        pre_comments = self._yaml_get_pre_comment()
-        if comment[-1] == '\n':
-            comment = comment[:-1]  # strip final newline if there
-        start_mark = Mark(None, None, None, indent, None, None)
-        for com in comment.split('\n'):
-            pre_comments.append(CommentToken('# ' + com + '\n', start_mark, None))
-
-    @property
-    def fa(self):
-        """format attribute
-
-        set_flow_style()/set_block_style()"""
-        if not hasattr(self, Format.attrib):
-            setattr(self, Format.attrib, Format())
-        return getattr(self, Format.attrib)
-
-    def yaml_add_eol_comment(self, comment, key=NoComment, column=None):
-        """
-        there is a problem as eol comments should start with ' #'
-        (but at the beginning of the line the space doesn't have to be before
-        the #. The column index is for the # mark
-        """
-        from .tokens import CommentToken
-        from .error import Mark
-        if column is None:
-            column = self._yaml_get_column(key)
-        if comment[0] != '#':
-            comment = '# ' + comment
-        if column is None:
-            if comment[0] == '#':
-                comment = ' ' + comment
-                column = 0
-        start_mark = Mark(None, None, None, column, None, None)
-        ct = [CommentToken(comment, start_mark, None), None]
-        self._yaml_add_eol_comment(ct, key=key)
-
-    @property
-    def lc(self):
-        if not hasattr(self, LineCol.attrib):
-            setattr(self, LineCol.attrib, LineCol())
-        return getattr(self, LineCol.attrib)
-
-    def _yaml_set_line_col(self, line, col):
-        self.lc.line = line
-        self.lc.col = col
-
-    def _yaml_set_kv_line_col(self, key, data):
-        self.lc.add_kv_line_col(key, data)
-
-    def _yaml_set_idx_line_col(self, key, data):
-        self.lc.add_idx_line_col(key, data)
-
-    @property
-    def anchor(self):
-        if not hasattr(self, Anchor.attrib):
-            setattr(self, Anchor.attrib, Anchor())
-        return getattr(self, Anchor.attrib)
-
-    def yaml_anchor(self):
-        if not hasattr(self, Anchor.attrib):
-            return None
-        return self.anchor
-
-    def yaml_set_anchor(self, value, always_dump=False):
-        self.anchor.value = value
-        self.anchor.always_dump = always_dump
-
-    @property
-    def tag(self):
-        if not hasattr(self, Tag.attrib):
-            setattr(self, Tag.attrib, Tag())
-        return getattr(self, Tag.attrib)
-
-    def yaml_set_tag(self, value):
-        self.tag.value = value
-
-
-class CommentedSeq(list, CommentedBase):
-    __slots__ = [Comment.attrib, ]
-
-    def _yaml_add_comment(self, comment, key=NoComment):
-        if key is not NoComment:
-            self.yaml_key_comment_extend(key, comment)
-        else:
-            self.ca.comment = comment
-
-    def _yaml_add_eol_comment(self, comment, key):
-        self._yaml_add_comment(comment, key=key)
-
-    def _yaml_get_columnX(self, key):
-        return self.ca.items[key][0].start_mark.column
-
-    def insert(self, idx, val):
-        """the comments after the insertion have to move forward"""
-        list.insert(self, idx, val)
-        for list_index in sorted(self.ca.items, reverse=True):
-            if list_index < idx:
-                break
-            self.ca.items[list_index+1] = self.ca.items.pop(list_index)
-
-    def pop(self, idx):
-        res = list.pop(self, idx)
-        self.ca.items.pop(idx, None)  # might not be there -> default value
-        for list_index in sorted(self.ca.items):
-            if list_index < idx:
-                continue
-            self.ca.items[list_index-1] = self.ca.items.pop(list_index)
-        return res
-
-    def _yaml_get_column(self, key):
-        column = None
-        sel_idx = None
-        pre, post = key-1, key+1
-        if pre in self.ca.items:
-            sel_idx = pre
-        elif post in self.ca.items:
-            sel_idx = post
-        else:
-            # self.ca.items is not ordered
-            for row_idx, k1 in enumerate(self):
-                if row_idx >= key:
-                    break
-                if row_idx not in self.ca.items:
-                    continue
-                sel_idx = row_idx
-        if sel_idx is not None:
-            column = self._yaml_get_columnX(sel_idx)
-        return column
-
-    def _yaml_get_pre_comment(self):
-        if self.ca.comment is None:
-            pre_comments = []
-            self.ca.comment = [None, pre_comments]
-        else:
-            pre_comments = self.ca.comment[1] = []
-        return pre_comments
-
-
-class CommentedMap(ordereddict, CommentedBase):
-    __slots__ = [Comment.attrib, ]
-
-    def _yaml_add_comment(self, comment, key=NoComment, value=NoComment):
-        """values is set to key to indicate a value attachment of comment"""
-        if key is not NoComment:
-            self.yaml_key_comment_extend(key, comment)
-            return
-        if value is not NoComment:
-            self.yaml_value_comment_extend(value, comment)
-        else:
-            self.ca.comment = comment
-
-    def _yaml_add_eol_comment(self, comment, key):
-        """add on the value line, with value specified by the key"""
-        self._yaml_add_comment(comment, value=key)
-
-    def _yaml_get_columnX(self, key):
-        return self.ca.items[key][2].start_mark.column
-
-    def _yaml_get_column(self, key):
-        column = None
-        sel_idx = None
-        pre, post, last = None, None, None
-        for x in self:
-            if pre is not None and x != key:
-                post = x
-                break
-            if x == key:
-                pre = last
-            last = x
-        if pre in self.ca.items:
-            sel_idx = pre
-        elif post in self.ca.items:
-            sel_idx = post
-        else:
-            # self.ca.items is not ordered
-            for row_idx, k1 in enumerate(self):
-                if k1 >= key:
-                    break
-                if k1 not in self.ca.items:
-                    continue
-                sel_idx = k1
-        if sel_idx is not None:
-            column = self._yaml_get_columnX(sel_idx)
-        return column
-
-    def _yaml_get_pre_comment(self):
-        if self.ca.comment is None:
-            pre_comments = []
-            self.ca.comment = [None, pre_comments]
-        else:
-            pre_comments = self.ca.comment[1] = []
-        return pre_comments
-
-    def update(self, *vals, **kwds):
-        try:
-            ordereddict.update(self, *vals, **kwds)
-        except TypeError:
-            # probably a dict that is used
-            for x in vals:
-                self[x] = vals[x]
-
-    def insert(self, pos, key, value, comment=None):
-        """insert key value into given position
-        attach comment if provided
-        """
-        ordereddict.insert(self, pos, key, value)
-        if comment is not None:
-            self.yaml_add_eol_comment(comment, key=key)
-
-    def mlget(self, key, default=None, list_ok=False):
-        """multi-level get that expects dicts within dicts"""
-        if not isinstance(key, list):
-            return self.get(key, default)
-        # assume that the key is a list of recursively accessible dicts
-
-        def get_one_level(key_list, level, d):
-            if not list_ok:
-                assert isinstance(d, dict)
-            if level >= len(key_list):
-                if level > len(key_list):
-                    raise IndexError
-                return d[key_list[level-1]]
-            return get_one_level(key_list, level+1, d[key_list[level-1]])
-
-        try:
-            return get_one_level(key, 1, self)
-        except KeyError:
-            return default
-        except (TypeError, IndexError):
-            if not list_ok:
-                raise
-            return default
-
-    def __getitem__(self, key):
-        try:
-            return ordereddict.__getitem__(self, key)
-        except KeyError:
-            for merged in getattr(self, merge_attrib, []):
-                if key in merged[1]:
-                    return merged[1][key]
-            raise
-
-    def get(self, key, default=None):
-        try:
-            return self.__getitem__(key)
-        except:
-            return default
-
-    @property
-    def merge(self):
-        if not hasattr(self, merge_attrib):
-            setattr(self, merge_attrib, [])
-        return getattr(self, merge_attrib)
-
-    def add_yaml_merge(self, value):
-        self.merge.extend(value)
-
-
-class CommentedOrderedMap(CommentedMap):
-    __slots__ = [Comment.attrib, ]
-
-
-class CommentedSet(MutableSet, CommentedMap):
-    __slots__ = [Comment.attrib, 'odict']
-
-    def __init__(self, values=None):
-        self.odict = ordereddict()
-        MutableSet.__init__(self)
-        if values is not None:
-            self |= values
-
-    def add(self, value):
-        """Add an element."""
-        self.odict[value] = None
-
-    def discard(self, value):
-        """Remove an element.  Do not raise an exception if absent."""
-        del self.odict[value]
-
-    def __contains__(self, x):
-        return x in self.odict
-
-    def __iter__(self):
-        for x in self.odict:
-            yield x
-
-    def __len__(self):
-        return len(self.odict)
-
-    def __repr__(self):
-        return 'set({0!r})'.format(self.odict.keys())

lib/spack/external/ruamel/yaml/compat.py

@@ -1,123 +0,0 @@
-# coding: utf-8
-
-from __future__ import print_function
-
-# partially from package six by Benjamin Peterson
-
-import sys
-import os
-import types
-
-try:
-    from ruamel.ordereddict import ordereddict
-except:
-    try:
-        from collections.abc import OrderedDict
-    except ImportError:
-        try:
-            from collections import OrderedDict
-        except ImportError:
-            from ordereddict import OrderedDict
-    # to get the right name import ... as ordereddict doesn't do that
-
-    class ordereddict(OrderedDict):
-        if not hasattr(OrderedDict, 'insert'):
-            def insert(self, pos, key, value):
-                if pos >= len(self):
-                    self[key] = value
-                    return
-                od = ordereddict()
-                od.update(self)
-                for k in od:
-                    del self[k]
-                for index, old_key in enumerate(od):
-                    if pos == index:
-                        self[key] = value
-                    self[old_key] = od[old_key]
-
-
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-
-if PY3:
-    def utf8(s):
-        return s
-
-    def to_str(s):
-        return s
-
-    def to_unicode(s):
-        return s
-
-else:
-    def utf8(s):
-        return s.encode('utf-8')
-
-    def to_str(s):
-        return str(s)
-
-    def to_unicode(s):
-        return unicode(s)
-
-if PY3:
-    string_types = str,
-    integer_types = int,
-    class_types = type,
-    text_type = str
-    binary_type = bytes
-
-    MAXSIZE = sys.maxsize
-    unichr = chr
-    import io
-    StringIO = io.StringIO
-    BytesIO = io.BytesIO
-
-else:
-    string_types = basestring,
-    integer_types = (int, long)
-    class_types = (type, types.ClassType)
-    text_type = unicode
-    binary_type = str
-
-    unichr = unichr  # to allow importing
-    import StringIO
-    StringIO = StringIO.StringIO
-    import cStringIO
-    BytesIO = cStringIO.StringIO
-
-if PY3:
-    builtins_module = 'builtins'
-else:
-    builtins_module = '__builtin__'
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass."""
-    return meta("NewBase", bases, {})
-
-DBG_TOKEN = 1
-DBG_EVENT = 2
-DBG_NODE = 4
-
-
-_debug = None
-
-
-# used from yaml util when testing
-def dbg(val=None):
-    global _debug
-    if _debug is None:
-        # set to true or false
-        _debug = os.environ.get('YAMLDEBUG')
-        if _debug is None:
-            _debug = 0
-        else:
-            _debug = int(_debug)
-    if val is None:
-        return _debug
-    return _debug & val
-
-
-def nprint(*args, **kw):
-    if dbg:
-        print(*args, **kw)

lib/spack/external/ruamel/yaml/composer.py

@@ -1,182 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-from __future__ import print_function
-
-
-try:
-    from .error import MarkedYAMLError
-    from .compat import utf8
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.error import MarkedYAMLError
-    from ruamel.yaml.compat import utf8
-
-from ruamel.yaml.events import (
-    StreamStartEvent, StreamEndEvent, MappingStartEvent, MappingEndEvent,
-    SequenceStartEvent, SequenceEndEvent, AliasEvent, ScalarEvent,
-)
-from ruamel.yaml.nodes import (
-    MappingNode, ScalarNode, SequenceNode,
-)
-
-__all__ = ['Composer', 'ComposerError']
-
-
-class ComposerError(MarkedYAMLError):
-    pass
-
-
-class Composer(object):
-    def __init__(self):
-        self.anchors = {}
-
-    def check_node(self):
-        # Drop the STREAM-START event.
-        if self.check_event(StreamStartEvent):
-            self.get_event()
-
-        # If there are more documents available?
-        return not self.check_event(StreamEndEvent)
-
-    def get_node(self):
-        # Get the root node of the next document.
-        if not self.check_event(StreamEndEvent):
-            return self.compose_document()
-
-    def get_single_node(self):
-        # Drop the STREAM-START event.
-        self.get_event()
-
-        # Compose a document if the stream is not empty.
-        document = None
-        if not self.check_event(StreamEndEvent):
-            document = self.compose_document()
-
-        # Ensure that the stream contains no more documents.
-        if not self.check_event(StreamEndEvent):
-            event = self.get_event()
-            raise ComposerError(
-                "expected a single document in the stream",
-                document.start_mark, "but found another document",
-                event.start_mark)
-
-        # Drop the STREAM-END event.
-        self.get_event()
-
-        return document
-
-    def compose_document(self):
-        # Drop the DOCUMENT-START event.
-        self.get_event()
-
-        # Compose the root node.
-        node = self.compose_node(None, None)
-
-        # Drop the DOCUMENT-END event.
-        self.get_event()
-
-        self.anchors = {}
-        return node
-
-    def compose_node(self, parent, index):
-        if self.check_event(AliasEvent):
-            event = self.get_event()
-            alias = event.anchor
-            if alias not in self.anchors:
-                raise ComposerError(
-                    None, None, "found undefined alias %r"
-                    % utf8(alias), event.start_mark)
-            return self.anchors[alias]
-        event = self.peek_event()
-        anchor = event.anchor
-        if anchor is not None:  # have an anchor
-            if anchor in self.anchors:
-                raise ComposerError(
-                    "found duplicate anchor %r; first occurence"
-                    % utf8(anchor), self.anchors[anchor].start_mark,
-                    "second occurence", event.start_mark)
-        self.descend_resolver(parent, index)
-        if self.check_event(ScalarEvent):
-            node = self.compose_scalar_node(anchor)
-        elif self.check_event(SequenceStartEvent):
-            node = self.compose_sequence_node(anchor)
-        elif self.check_event(MappingStartEvent):
-            node = self.compose_mapping_node(anchor)
-        self.ascend_resolver()
-        return node
-
-    def compose_scalar_node(self, anchor):
-        event = self.get_event()
-        tag = event.tag
-        if tag is None or tag == u'!':
-            tag = self.resolve(ScalarNode, event.value, event.implicit)
-        node = ScalarNode(tag, event.value,
-                          event.start_mark, event.end_mark, style=event.style,
-                          comment=event.comment)
-        if anchor is not None:
-            self.anchors[anchor] = node
-        return node
-
-    def compose_sequence_node(self, anchor):
-        start_event = self.get_event()
-        tag = start_event.tag
-        if tag is None or tag == u'!':
-            tag = self.resolve(SequenceNode, None, start_event.implicit)
-        node = SequenceNode(tag, [],
-                            start_event.start_mark, None,
-                            flow_style=start_event.flow_style,
-                            comment=start_event.comment, anchor=anchor)
-        if anchor is not None:
-            self.anchors[anchor] = node
-        index = 0
-        while not self.check_event(SequenceEndEvent):
-            node.value.append(self.compose_node(node, index))
-            index += 1
-        end_event = self.get_event()
-        if node.flow_style is True and end_event.comment is not None:
-            if node.comment is not None:
-                print('Warning: unexpected end_event commment in sequence '
-                      'node {0}'.format(node.flow_style))
-            node.comment = end_event.comment
-        node.end_mark = end_event.end_mark
-        self.check_end_doc_comment(end_event, node)
-        return node
-
-    def compose_mapping_node(self, anchor):
-        start_event = self.get_event()
-        tag = start_event.tag
-        if tag is None or tag == u'!':
-            tag = self.resolve(MappingNode, None, start_event.implicit)
-        node = MappingNode(tag, [],
-                           start_event.start_mark, None,
-                           flow_style=start_event.flow_style,
-                           comment=start_event.comment, anchor=anchor)
-        if anchor is not None:
-            self.anchors[anchor] = node
-        while not self.check_event(MappingEndEvent):
-            # key_event = self.peek_event()
-            item_key = self.compose_node(node, None)
-            # if item_key in node.value:
-            #     raise ComposerError("while composing a mapping",
-            #             start_event.start_mark,
-            #             "found duplicate key", key_event.start_mark)
-            item_value = self.compose_node(node, item_key)
-            # node.value[item_key] = item_value
-            node.value.append((item_key, item_value))
-        end_event = self.get_event()
-        if node.flow_style is True and end_event.comment is not None:
-            node.comment = end_event.comment
-        node.end_mark = end_event.end_mark
-        self.check_end_doc_comment(end_event, node)
-        return node
-
-    def check_end_doc_comment(self, end_event, node):
-        if end_event.comment and end_event.comment[1]:
-            # pre comments on an end_event, no following to move to
-            if node.comment is None:
-                node.comment = [None, None]
-            assert not isinstance(node, ScalarEvent)
-            # this is a post comment on a mapping node, add as third element
-            # in the list
-            node.comment.append(end_event.comment[1])
-            end_event.comment[1] = None

lib/spack/external/ruamel/yaml/configobjwalker.py

@@ -1,9 +0,0 @@
-# coding: utf-8
-
-import warnings
-from ruamel.yaml.util import configobj_walker as new_configobj_walker
-
-
-def configobj_walker(cfg):
-    warnings.warn("configobj_walker has move to ruamel.yaml.util, please update your code")
-    return new_configobj_walker(cfg)

lib/spack/external/ruamel/yaml/dumper.py

@@ -1,102 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-__all__ = ['BaseDumper', 'SafeDumper', 'Dumper', 'RoundTripDumper']
-
-try:
-    from .emitter import *                               # NOQA
-    from .serializer import *                               # NOQA
-    from .representer import *                               # NOQA
-    from .resolver import *                               # NOQA
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.emitter import *                               # NOQA
-    from ruamel.yaml.serializer import *                               # NOQA
-    from ruamel.yaml.representer import *                               # NOQA
-    from ruamel.yaml.resolver import *                               # NOQA
-
-
-class BaseDumper(Emitter, Serializer, BaseRepresenter, BaseResolver):
-    def __init__(self, stream,
-                 default_style=None, default_flow_style=None,
-                 canonical=None, indent=None, width=None,
-                 allow_unicode=None, line_break=None,
-                 encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None, block_seq_indent=None,
-                 top_level_colon_align=None, prefix_colon=None):
-        Emitter.__init__(self, stream, canonical=canonical,
-                         indent=indent, width=width,
-                         allow_unicode=allow_unicode, line_break=line_break,
-                         block_seq_indent=block_seq_indent)
-        Serializer.__init__(self, encoding=encoding,
-                            explicit_start=explicit_start,
-                            explicit_end=explicit_end,
-                            version=version, tags=tags)
-        Representer.__init__(self, default_style=default_style,
-                             default_flow_style=default_flow_style)
-        Resolver.__init__(self)
-
-
-class SafeDumper(Emitter, Serializer, SafeRepresenter, Resolver):
-    def __init__(self, stream,
-                 default_style=None, default_flow_style=None,
-                 canonical=None, indent=None, width=None,
-                 allow_unicode=None, line_break=None,
-                 encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None, block_seq_indent=None,
-                 top_level_colon_align=None, prefix_colon=None):
-        Emitter.__init__(self, stream, canonical=canonical,
-                         indent=indent, width=width,
-                         allow_unicode=allow_unicode, line_break=line_break,
-                         block_seq_indent=block_seq_indent)
-        Serializer.__init__(self, encoding=encoding,
-                            explicit_start=explicit_start,
-                            explicit_end=explicit_end,
-                            version=version, tags=tags)
-        SafeRepresenter.__init__(self, default_style=default_style,
-                                 default_flow_style=default_flow_style)
-        Resolver.__init__(self)
-
-
-class Dumper(Emitter, Serializer, Representer, Resolver):
-    def __init__(self, stream,
-                 default_style=None, default_flow_style=None,
-                 canonical=None, indent=None, width=None,
-                 allow_unicode=None, line_break=None,
-                 encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None, block_seq_indent=None,
-                 top_level_colon_align=None, prefix_colon=None):
-        Emitter.__init__(self, stream, canonical=canonical,
-                         indent=indent, width=width,
-                         allow_unicode=allow_unicode, line_break=line_break,
-                         block_seq_indent=block_seq_indent)
-        Serializer.__init__(self, encoding=encoding,
-                            explicit_start=explicit_start,
-                            explicit_end=explicit_end,
-                            version=version, tags=tags)
-        Representer.__init__(self, default_style=default_style,
-                             default_flow_style=default_flow_style)
-        Resolver.__init__(self)
-
-
-class RoundTripDumper(Emitter, Serializer, RoundTripRepresenter, VersionedResolver):
-    def __init__(self, stream,
-                 default_style=None, default_flow_style=None,
-                 canonical=None, indent=None, width=None,
-                 allow_unicode=None, line_break=None,
-                 encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None, block_seq_indent=None,
-                 top_level_colon_align=None, prefix_colon=None):
-        Emitter.__init__(self, stream, canonical=canonical,
-                         indent=indent, width=width,
-                         allow_unicode=allow_unicode, line_break=line_break,
-                         block_seq_indent=block_seq_indent,
-                         top_level_colon_align=top_level_colon_align,
-                         prefix_colon=prefix_colon)
-        Serializer.__init__(self, encoding=encoding,
-                            explicit_start=explicit_start,
-                            explicit_end=explicit_end,
-                            version=version, tags=tags)
-        RoundTripRepresenter.__init__(self, default_style=default_style,
-                                      default_flow_style=default_flow_style)
-        VersionedResolver.__init__(self)

lib/spack/external/ruamel/yaml/error.py

@@ -1,85 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-__all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']
-
-try:
-    from .compat import utf8
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.compat import utf8
-
-
-class Mark(object):
-    def __init__(self, name, index, line, column, buffer, pointer):
-        self.name = name
-        self.index = index
-        self.line = line
-        self.column = column
-        self.buffer = buffer
-        self.pointer = pointer
-
-    def get_snippet(self, indent=4, max_length=75):
-        if self.buffer is None:
-            return None
-        head = ''
-        start = self.pointer
-        while (start > 0 and
-               self.buffer[start-1] not in u'\0\r\n\x85\u2028\u2029'):
-            start -= 1
-            if self.pointer-start > max_length/2-1:
-                head = ' ... '
-                start += 5
-                break
-        tail = ''
-        end = self.pointer
-        while (end < len(self.buffer) and
-               self.buffer[end] not in u'\0\r\n\x85\u2028\u2029'):
-            end += 1
-            if end-self.pointer > max_length/2-1:
-                tail = ' ... '
-                end -= 5
-                break
-        snippet = utf8(self.buffer[start:end])
-        return ' '*indent + head + snippet + tail + '\n' \
-               + ' '*(indent+self.pointer-start+len(head)) + '^'
-
-    def __str__(self):
-        snippet = self.get_snippet()
-        where = "  in \"%s\", line %d, column %d"   \
-                % (self.name, self.line+1, self.column+1)
-        if snippet is not None:
-            where += ":\n"+snippet
-        return where
-
-
-class YAMLError(Exception):
-    pass
-
-
-class MarkedYAMLError(YAMLError):
-    def __init__(self, context=None, context_mark=None,
-                 problem=None, problem_mark=None, note=None):
-        self.context = context
-        self.context_mark = context_mark
-        self.problem = problem
-        self.problem_mark = problem_mark
-        self.note = note
-
-    def __str__(self):
-        lines = []
-        if self.context is not None:
-            lines.append(self.context)
-        if self.context_mark is not None  \
-           and (self.problem is None or self.problem_mark is None or
-                self.context_mark.name != self.problem_mark.name or
-                self.context_mark.line != self.problem_mark.line or
-                self.context_mark.column != self.problem_mark.column):
-            lines.append(str(self.context_mark))
-        if self.problem is not None:
-            lines.append(self.problem)
-        if self.problem_mark is not None:
-            lines.append(str(self.problem_mark))
-        if self.note is not None:
-            lines.append(self.note)
-        return '\n'.join(lines)

lib/spack/external/ruamel/yaml/events.py

@@ -1,106 +0,0 @@
-# coding: utf-8
-
-# Abstract classes.
-
-
-def CommentCheck():
-    pass
-
-
-class Event(object):
-    def __init__(self, start_mark=None, end_mark=None, comment=CommentCheck):
-        self.start_mark = start_mark
-        self.end_mark = end_mark
-        # assert comment is not CommentCheck
-        if comment is CommentCheck:
-            comment = None
-        self.comment = comment
-
-    def __repr__(self):
-        attributes = [key for key in ['anchor', 'tag', 'implicit', 'value',
-                                      'flow_style', 'style']
-                      if hasattr(self, key)]
-        arguments = ', '.join(['%s=%r' % (key, getattr(self, key))
-                               for key in attributes])
-        if self.comment not in [None, CommentCheck]:
-            arguments += ', comment={!r}'.format(self.comment)
-        return '%s(%s)' % (self.__class__.__name__, arguments)
-
-
-class NodeEvent(Event):
-    def __init__(self, anchor, start_mark=None, end_mark=None, comment=None):
-        Event.__init__(self, start_mark, end_mark, comment)
-        self.anchor = anchor
-
-
-class CollectionStartEvent(NodeEvent):
-    def __init__(self, anchor, tag, implicit, start_mark=None, end_mark=None,
-                 flow_style=None, comment=None):
-        Event.__init__(self, start_mark, end_mark, comment)
-        self.anchor = anchor
-        self.tag = tag
-        self.implicit = implicit
-        self.flow_style = flow_style
-
-
-class CollectionEndEvent(Event):
-    pass
-
-# Implementations.
-
-
-class StreamStartEvent(Event):
-    def __init__(self, start_mark=None, end_mark=None, encoding=None,
-                 comment=None):
-        Event.__init__(self, start_mark, end_mark, comment)
-        self.encoding = encoding
-
-
-class StreamEndEvent(Event):
-    pass
-
-
-class DocumentStartEvent(Event):
-    def __init__(self, start_mark=None, end_mark=None,
-                 explicit=None, version=None, tags=None, comment=None):
-        Event.__init__(self, start_mark, end_mark, comment)
-        self.explicit = explicit
-        self.version = version
-        self.tags = tags
-
-
-class DocumentEndEvent(Event):
-    def __init__(self, start_mark=None, end_mark=None,
-                 explicit=None, comment=None):
-        Event.__init__(self, start_mark, end_mark, comment)
-        self.explicit = explicit
-
-
-class AliasEvent(NodeEvent):
-    pass
-
-
-class ScalarEvent(NodeEvent):
-    def __init__(self, anchor, tag, implicit, value,
-                 start_mark=None, end_mark=None, style=None, comment=None):
-        NodeEvent.__init__(self, anchor, start_mark, end_mark, comment)
-        self.tag = tag
-        self.implicit = implicit
-        self.value = value
-        self.style = style
-
-
-class SequenceStartEvent(CollectionStartEvent):
-    pass
-
-
-class SequenceEndEvent(CollectionEndEvent):
-    pass
-
-
-class MappingStartEvent(CollectionStartEvent):
-    pass
-
-
-class MappingEndEvent(CollectionEndEvent):
-    pass

lib/spack/external/ruamel/yaml/loader.py

@@ -1,61 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-__all__ = ['BaseLoader', 'SafeLoader', 'Loader', 'RoundTripLoader']
-
-try:
-    from .reader import *                                # NOQA
-    from .scanner import *                               # NOQA
-    from .parser import *                                # NOQA
-    from .composer import *                              # NOQA
-    from .constructor import *                           # NOQA
-    from .resolver import *                              # NOQA
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.reader import *                                # NOQA
-    from ruamel.yaml.scanner import *                               # NOQA
-    from ruamel.yaml.parser import *                                # NOQA
-    from ruamel.yaml.composer import *                              # NOQA
-    from ruamel.yaml.constructor import *                           # NOQA
-    from ruamel.yaml.resolver import *                              # NOQA
-
-
-class BaseLoader(Reader, Scanner, Parser, Composer, BaseConstructor, BaseResolver):
-    def __init__(self, stream, version=None, preserve_quotes=None):
-        Reader.__init__(self, stream)
-        Scanner.__init__(self)
-        Parser.__init__(self)
-        Composer.__init__(self)
-        BaseConstructor.__init__(self)
-        BaseResolver.__init__(self)
-
-
-class SafeLoader(Reader, Scanner, Parser, Composer, SafeConstructor, Resolver):
-    def __init__(self, stream, version=None, preserve_quotes=None):
-        Reader.__init__(self, stream)
-        Scanner.__init__(self)
-        Parser.__init__(self)
-        Composer.__init__(self)
-        SafeConstructor.__init__(self)
-        Resolver.__init__(self)
-
-
-class Loader(Reader, Scanner, Parser, Composer, Constructor, Resolver):
-    def __init__(self, stream, version=None, preserve_quotes=None):
-        Reader.__init__(self, stream)
-        Scanner.__init__(self)
-        Parser.__init__(self)
-        Composer.__init__(self)
-        Constructor.__init__(self)
-        Resolver.__init__(self)
-
-
-class RoundTripLoader(Reader, RoundTripScanner, RoundTripParser, Composer,
-                      RoundTripConstructor, VersionedResolver):
-    def __init__(self, stream, version=None, preserve_quotes=None):
-        Reader.__init__(self, stream)
-        RoundTripScanner.__init__(self)
-        RoundTripParser.__init__(self)
-        Composer.__init__(self)
-        RoundTripConstructor.__init__(self, preserve_quotes=preserve_quotes)
-        VersionedResolver.__init__(self, version)

lib/spack/external/ruamel/yaml/main.py

@@ -1,395 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-
-from ruamel.yaml.error import *                                # NOQA
-
-from ruamel.yaml.tokens import *                               # NOQA
-from ruamel.yaml.events import *                               # NOQA
-from ruamel.yaml.nodes import *                                # NOQA
-
-from ruamel.yaml.loader import *                               # NOQA
-from ruamel.yaml.dumper import *                               # NOQA
-from ruamel.yaml.compat import StringIO, BytesIO, with_metaclass, PY3
-
-# import io
-
-
-def scan(stream, Loader=Loader):
-    """
-    Scan a YAML stream and produce scanning tokens.
-    """
-    loader = Loader(stream)
-    try:
-        while loader.check_token():
-            yield loader.get_token()
-    finally:
-        loader.dispose()
-
-
-def parse(stream, Loader=Loader):
-    """
-    Parse a YAML stream and produce parsing events.
-    """
-    loader = Loader(stream)
-    try:
-        while loader.check_event():
-            yield loader.get_event()
-    finally:
-        loader.dispose()
-
-
-def compose(stream, Loader=Loader):
-    """
-    Parse the first YAML document in a stream
-    and produce the corresponding representation tree.
-    """
-    loader = Loader(stream)
-    try:
-        return loader.get_single_node()
-    finally:
-        loader.dispose()
-
-
-def compose_all(stream, Loader=Loader):
-    """
-    Parse all YAML documents in a stream
-    and produce corresponding representation trees.
-    """
-    loader = Loader(stream)
-    try:
-        while loader.check_node():
-            yield loader.get_node()
-    finally:
-        loader.dispose()
-
-
-def load(stream, Loader=Loader, version=None, preserve_quotes=None):
-    """
-    Parse the first YAML document in a stream
-    and produce the corresponding Python object.
-    """
-    loader = Loader(stream, version, preserve_quotes=preserve_quotes)
-    try:
-        return loader.get_single_data()
-    finally:
-        loader.dispose()
-
-
-def load_all(stream, Loader=Loader, version=None):
-    """
-    Parse all YAML documents in a stream
-    and produce corresponding Python objects.
-    """
-    loader = Loader(stream, version)
-    try:
-        while loader.check_data():
-            yield loader.get_data()
-    finally:
-        loader.dispose()
-
-
-def safe_load(stream, version=None):
-    """
-    Parse the first YAML document in a stream
-    and produce the corresponding Python object.
-    Resolve only basic YAML tags.
-    """
-    return load(stream, SafeLoader, version)
-
-
-def safe_load_all(stream, version=None):
-    """
-    Parse all YAML documents in a stream
-    and produce corresponding Python objects.
-    Resolve only basic YAML tags.
-    """
-    return load_all(stream, SafeLoader, version)
-
-
-def round_trip_load(stream, version=None, preserve_quotes=None):
-    """
-    Parse the first YAML document in a stream
-    and produce the corresponding Python object.
-    Resolve only basic YAML tags.
-    """
-    return load(stream, RoundTripLoader, version, preserve_quotes=preserve_quotes)
-
-
-def round_trip_load_all(stream, version=None, preserve_quotes=None):
-    """
-    Parse all YAML documents in a stream
-    and produce corresponding Python objects.
-    Resolve only basic YAML tags.
-    """
-    return load_all(stream, RoundTripLoader, version, preserve_quotes=preserve_quotes)
-
-
-def emit(events, stream=None, Dumper=Dumper,
-         canonical=None, indent=None, width=None,
-         allow_unicode=None, line_break=None):
-    """
-    Emit YAML parsing events into a stream.
-    If stream is None, return the produced string instead.
-    """
-    getvalue = None
-    if stream is None:
-        stream = StringIO()
-        getvalue = stream.getvalue
-    dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
-                    allow_unicode=allow_unicode, line_break=line_break)
-    try:
-        for event in events:
-            dumper.emit(event)
-    finally:
-        dumper.dispose()
-    if getvalue:
-        return getvalue()
-
-enc = None if PY3 else 'utf-8'
-
-
-def serialize_all(nodes, stream=None, Dumper=Dumper,
-                  canonical=None, indent=None, width=None,
-                  allow_unicode=None, line_break=None,
-                  encoding=enc, explicit_start=None, explicit_end=None,
-                  version=None, tags=None):
-    """
-    Serialize a sequence of representation trees into a YAML stream.
-    If stream is None, return the produced string instead.
-    """
-    getvalue = None
-    if stream is None:
-        if encoding is None:
-            stream = StringIO()
-        else:
-            stream = BytesIO()
-        getvalue = stream.getvalue
-    dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
-                    allow_unicode=allow_unicode, line_break=line_break,
-                    encoding=encoding, version=version, tags=tags,
-                    explicit_start=explicit_start, explicit_end=explicit_end)
-    try:
-        dumper.open()
-        for node in nodes:
-            dumper.serialize(node)
-        dumper.close()
-    finally:
-        dumper.dispose()
-    if getvalue:
-        return getvalue()
-
-
-def serialize(node, stream=None, Dumper=Dumper, **kwds):
-    """
-    Serialize a representation tree into a YAML stream.
-    If stream is None, return the produced string instead.
-    """
-    return serialize_all([node], stream, Dumper=Dumper, **kwds)
-
-
-def dump_all(documents, stream=None, Dumper=Dumper,
-             default_style=None, default_flow_style=None,
-             canonical=None, indent=None, width=None,
-             allow_unicode=None, line_break=None,
-             encoding=enc, explicit_start=None, explicit_end=None,
-             version=None, tags=None, block_seq_indent=None,
-             top_level_colon_align=None, prefix_colon=None):
-    """
-    Serialize a sequence of Python objects into a YAML stream.
-    If stream is None, return the produced string instead.
-    """
-    getvalue = None
-    if top_level_colon_align is True:
-        top_level_colon_align = max([len(str(x)) for x in documents[0]])
-    if stream is None:
-        if encoding is None:
-            stream = StringIO()
-        else:
-            stream = BytesIO()
-        getvalue = stream.getvalue
-    dumper = Dumper(stream, default_style=default_style,
-                    default_flow_style=default_flow_style,
-                    canonical=canonical, indent=indent, width=width,
-                    allow_unicode=allow_unicode, line_break=line_break,
-                    encoding=encoding, explicit_start=explicit_start,
-                    explicit_end=explicit_end, version=version,
-                    tags=tags, block_seq_indent=block_seq_indent,
-                    top_level_colon_align=top_level_colon_align, prefix_colon=prefix_colon,
-                    )
-    try:
-        dumper.open()
-        for data in documents:
-            dumper.represent(data)
-        dumper.close()
-    finally:
-        dumper.dispose()
-    if getvalue:
-        return getvalue()
-
-
-def dump(data, stream=None, Dumper=Dumper,
-         default_style=None, default_flow_style=None,
-         canonical=None, indent=None, width=None,
-         allow_unicode=None, line_break=None,
-         encoding=enc, explicit_start=None, explicit_end=None,
-         version=None, tags=None, block_seq_indent=None):
-    """
-    Serialize a Python object into a YAML stream.
-    If stream is None, return the produced string instead.
-
-    default_style ∈ None, '', '"', "'", '|', '>'
-
-    """
-    return dump_all([data], stream, Dumper=Dumper,
-                    default_style=default_style,
-                    default_flow_style=default_flow_style,
-                    canonical=canonical,
-                    indent=indent, width=width,
-                    allow_unicode=allow_unicode,
-                    line_break=line_break,
-                    encoding=encoding, explicit_start=explicit_start,
-                    explicit_end=explicit_end,
-                    version=version, tags=tags, block_seq_indent=block_seq_indent)
-
-
-def safe_dump_all(documents, stream=None, **kwds):
-    """
-    Serialize a sequence of Python objects into a YAML stream.
-    Produce only basic YAML tags.
-    If stream is None, return the produced string instead.
-    """
-    return dump_all(documents, stream, Dumper=SafeDumper, **kwds)
-
-
-def safe_dump(data, stream=None, **kwds):
-    """
-    Serialize a Python object into a YAML stream.
-    Produce only basic YAML tags.
-    If stream is None, return the produced string instead.
-    """
-    return dump_all([data], stream, Dumper=SafeDumper, **kwds)
-
-
-def round_trip_dump(data, stream=None, Dumper=RoundTripDumper,
-                    default_style=None, default_flow_style=None,
-                    canonical=None, indent=None, width=None,
-                    allow_unicode=None, line_break=None,
-                    encoding=enc, explicit_start=None, explicit_end=None,
-                    version=None, tags=None, block_seq_indent=None,
-                    top_level_colon_align=None, prefix_colon=None):
-    allow_unicode = True if allow_unicode is None else allow_unicode
-    return dump_all([data], stream, Dumper=Dumper,
-                    default_style=default_style,
-                    default_flow_style=default_flow_style,
-                    canonical=canonical,
-                    indent=indent, width=width,
-                    allow_unicode=allow_unicode,
-                    line_break=line_break,
-                    encoding=encoding, explicit_start=explicit_start,
-                    explicit_end=explicit_end,
-                    version=version, tags=tags, block_seq_indent=block_seq_indent,
-                    top_level_colon_align=top_level_colon_align, prefix_colon=prefix_colon)
-
-
-def add_implicit_resolver(tag, regexp, first=None,
-                          Loader=Loader, Dumper=Dumper):
-    """
-    Add an implicit scalar detector.
-    If an implicit scalar value matches the given regexp,
-    the corresponding tag is assigned to the scalar.
-    first is a sequence of possible initial characters or None.
-    """
-    Loader.add_implicit_resolver(tag, regexp, first)
-    Dumper.add_implicit_resolver(tag, regexp, first)
-
-
-def add_path_resolver(tag, path, kind=None, Loader=Loader, Dumper=Dumper):
-    """
-    Add a path based resolver for the given tag.
-    A path is a list of keys that forms a path
-    to a node in the representation tree.
-    Keys can be string values, integers, or None.
-    """
-    Loader.add_path_resolver(tag, path, kind)
-    Dumper.add_path_resolver(tag, path, kind)
-
-
-def add_constructor(tag, constructor, Loader=Loader):
-    """
-    Add a constructor for the given tag.
-    Constructor is a function that accepts a Loader instance
-    and a node object and produces the corresponding Python object.
-    """
-    Loader.add_constructor(tag, constructor)
-
-
-def add_multi_constructor(tag_prefix, multi_constructor, Loader=Loader):
-    """
-    Add a multi-constructor for the given tag prefix.
-    Multi-constructor is called for a node if its tag starts with tag_prefix.
-    Multi-constructor accepts a Loader instance, a tag suffix,
-    and a node object and produces the corresponding Python object.
-    """
-    Loader.add_multi_constructor(tag_prefix, multi_constructor)
-
-
-def add_representer(data_type, representer, Dumper=Dumper):
-    """
-    Add a representer for the given type.
-    Representer is a function accepting a Dumper instance
-    and an instance of the given data type
-    and producing the corresponding representation node.
-    """
-    Dumper.add_representer(data_type, representer)
-
-
-def add_multi_representer(data_type, multi_representer, Dumper=Dumper):
-    """
-    Add a representer for the given type.
-    Multi-representer is a function accepting a Dumper instance
-    and an instance of the given data type or subtype
-    and producing the corresponding representation node.
-    """
-    Dumper.add_multi_representer(data_type, multi_representer)
-
-
-class YAMLObjectMetaclass(type):
-    """
-    The metaclass for YAMLObject.
-    """
-    def __init__(cls, name, bases, kwds):
-        super(YAMLObjectMetaclass, cls).__init__(name, bases, kwds)
-        if 'yaml_tag' in kwds and kwds['yaml_tag'] is not None:
-            cls.yaml_loader.add_constructor(cls.yaml_tag, cls.from_yaml)
-            cls.yaml_dumper.add_representer(cls, cls.to_yaml)
-
-
-class YAMLObject(with_metaclass(YAMLObjectMetaclass)):
-    """
-    An object that can dump itself to a YAML stream
-    and load itself from a YAML stream.
-    """
-    __slots__ = ()  # no direct instantiation, so allow immutable subclasses
-
-    yaml_loader = Loader
-    yaml_dumper = Dumper
-
-    yaml_tag = None
-    yaml_flow_style = None
-
-    @classmethod
-    def from_yaml(cls, loader, node):
-        """
-        Convert a representation node to a Python object.
-        """
-        return loader.construct_yaml_object(node, cls)
-
-    @classmethod
-    def to_yaml(cls, dumper, data):
-        """
-        Convert a Python object to a representation node.
-        """
-        return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
-                                            flow_style=cls.yaml_flow_style)

lib/spack/external/ruamel/yaml/nodes.py

@@ -1,86 +0,0 @@
-# coding: utf-8
-
-from __future__ import print_function
-
-
-class Node(object):
-    def __init__(self, tag, value, start_mark, end_mark, comment=None):
-        self.tag = tag
-        self.value = value
-        self.start_mark = start_mark
-        self.end_mark = end_mark
-        self.comment = comment
-        self.anchor = None
-
-    def __repr__(self):
-        value = self.value
-        # if isinstance(value, list):
-        #     if len(value) == 0:
-        #         value = '<empty>'
-        #     elif len(value) == 1:
-        #         value = '<1 item>'
-        #     else:
-        #         value = '<%d items>' % len(value)
-        # else:
-        #     if len(value) > 75:
-        #         value = repr(value[:70]+u' ... ')
-        #     else:
-        #         value = repr(value)
-        value = repr(value)
-        return '%s(tag=%r, value=%s)' % (self.__class__.__name__,
-                                         self.tag, value)
-
-    def dump(self, indent=0):
-        if isinstance(self.value, basestring):
-            print('{0}{1}(tag={!r}, value={!r})'.format(
-                '  ' * indent, self.__class__.__name__, self.tag, self.value))
-            if self.comment:
-                print('    {0}comment: {1})'.format(
-                    '  ' * indent, self.comment))
-            return
-        print('{0}{1}(tag={!r})'.format(
-            '  ' * indent, self.__class__.__name__, self.tag))
-        if self.comment:
-            print('    {0}comment: {1})'.format(
-                '  ' * indent, self.comment))
-        for v in self.value:
-            if isinstance(v, tuple):
-                for v1 in v:
-                    v1.dump(indent+1)
-            elif isinstance(v, Node):
-                v.dump(indent+1)
-            else:
-                print('Node value type?', type(v))
-
-
-class ScalarNode(Node):
-    """
-    styles:
-      ? -> set() ? key, no value
-      " -> double quoted
-      ' -> single quoted
-      | -> literal style
-      > ->
-    """
-    id = 'scalar'
-
-    def __init__(self, tag, value, start_mark=None, end_mark=None, style=None,
-                 comment=None):
-        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment)
-        self.style = style
-
-
-class CollectionNode(Node):
-    def __init__(self, tag, value, start_mark=None, end_mark=None,
-                 flow_style=None, comment=None, anchor=None):
-        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment)
-        self.flow_style = flow_style
-        self.anchor = anchor
-
-
-class SequenceNode(CollectionNode):
-    id = 'sequence'
-
-
-class MappingNode(CollectionNode):
-    id = 'mapping'

lib/spack/external/ruamel/yaml/parser.py

@@ -1,675 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-# The following YAML grammar is LL(1) and is parsed by a recursive descent
-# parser.
-#
-# stream            ::= STREAM-START implicit_document? explicit_document*
-#                                                                   STREAM-END
-# implicit_document ::= block_node DOCUMENT-END*
-# explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
-# block_node_or_indentless_sequence ::=
-#                       ALIAS
-#                       | properties (block_content |
-#                                                   indentless_block_sequence)?
-#                       | block_content
-#                       | indentless_block_sequence
-# block_node        ::= ALIAS
-#                       | properties block_content?
-#                       | block_content
-# flow_node         ::= ALIAS
-#                       | properties flow_content?
-#                       | flow_content
-# properties        ::= TAG ANCHOR? | ANCHOR TAG?
-# block_content     ::= block_collection | flow_collection | SCALAR
-# flow_content      ::= flow_collection | SCALAR
-# block_collection  ::= block_sequence | block_mapping
-# flow_collection   ::= flow_sequence | flow_mapping
-# block_sequence    ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)*
-#                                                                   BLOCK-END
-# indentless_sequence   ::= (BLOCK-ENTRY block_node?)+
-# block_mapping     ::= BLOCK-MAPPING_START
-#                       ((KEY block_node_or_indentless_sequence?)?
-#                       (VALUE block_node_or_indentless_sequence?)?)*
-#                       BLOCK-END
-# flow_sequence     ::= FLOW-SEQUENCE-START
-#                       (flow_sequence_entry FLOW-ENTRY)*
-#                       flow_sequence_entry?
-#                       FLOW-SEQUENCE-END
-# flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
-# flow_mapping      ::= FLOW-MAPPING-START
-#                       (flow_mapping_entry FLOW-ENTRY)*
-#                       flow_mapping_entry?
-#                       FLOW-MAPPING-END
-# flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?
-#
-# FIRST sets:
-#
-# stream: { STREAM-START }
-# explicit_document: { DIRECTIVE DOCUMENT-START }
-# implicit_document: FIRST(block_node)
-# block_node: { ALIAS TAG ANCHOR SCALAR BLOCK-SEQUENCE-START
-#                  BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START }
-# flow_node: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START }
-# block_content: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START
-#                               FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
-# flow_content: { FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
-# block_collection: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START }
-# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
-# block_sequence: { BLOCK-SEQUENCE-START }
-# block_mapping: { BLOCK-MAPPING-START }
-# block_node_or_indentless_sequence: { ALIAS ANCHOR TAG SCALAR
-#               BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START
-#               FLOW-MAPPING-START BLOCK-ENTRY }
-# indentless_sequence: { ENTRY }
-# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
-# flow_sequence: { FLOW-SEQUENCE-START }
-# flow_mapping: { FLOW-MAPPING-START }
-# flow_sequence_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START
-#                                                    FLOW-MAPPING-START KEY }
-# flow_mapping_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START
-#                                                    FLOW-MAPPING-START KEY }
-
-__all__ = ['Parser', 'RoundTripParser', 'ParserError']
-
-# need to have full path, as pkg_resources tries to load parser.py in __init__.py
-# only to not do anything with the package afterwards
-# and for Jython too
-from ruamel.yaml.error import MarkedYAMLError                  # NOQA
-from ruamel.yaml.tokens import *                               # NOQA
-from ruamel.yaml.events import *                               # NOQA
-from ruamel.yaml.scanner import *                              # NOQA
-from ruamel.yaml.compat import utf8                            # NOQA
-
-
-class ParserError(MarkedYAMLError):
-    pass
-
-
-class Parser(object):
-    # Since writing a recursive-descendant parser is a straightforward task, we
-    # do not give many comments here.
-
-    DEFAULT_TAGS = {
-        u'!':   u'!',
-        u'!!':  u'tag:yaml.org,2002:',
-    }
-
-    def __init__(self):
-        self.current_event = None
-        self.yaml_version = None
-        self.tag_handles = {}
-        self.states = []
-        self.marks = []
-        self.state = self.parse_stream_start
-
-    def dispose(self):
-        # Reset the state attributes (to clear self-references)
-        self.states = []
-        self.state = None
-
-    def check_event(self, *choices):
-        # Check the type of the next event.
-        if self.current_event is None:
-            if self.state:
-                self.current_event = self.state()
-        if self.current_event is not None:
-            if not choices:
-                return True
-            for choice in choices:
-                if isinstance(self.current_event, choice):
-                    return True
-        return False
-
-    def peek_event(self):
-        # Get the next event.
-        if self.current_event is None:
-            if self.state:
-                self.current_event = self.state()
-        return self.current_event
-
-    def get_event(self):
-        # Get the next event and proceed further.
-        if self.current_event is None:
-            if self.state:
-                self.current_event = self.state()
-        value = self.current_event
-        self.current_event = None
-        return value
-
-    # stream    ::= STREAM-START implicit_document? explicit_document*
-    #                                                               STREAM-END
-    # implicit_document ::= block_node DOCUMENT-END*
-    # explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
-
-    def parse_stream_start(self):
-
-        # Parse the stream start.
-        token = self.get_token()
-        token.move_comment(self.peek_token())
-        event = StreamStartEvent(token.start_mark, token.end_mark,
-                                 encoding=token.encoding)
-
-        # Prepare the next state.
-        self.state = self.parse_implicit_document_start
-
-        return event
-
-    def parse_implicit_document_start(self):
-
-        # Parse an implicit document.
-        if not self.check_token(DirectiveToken, DocumentStartToken,
-                                StreamEndToken):
-            self.tag_handles = self.DEFAULT_TAGS
-            token = self.peek_token()
-            start_mark = end_mark = token.start_mark
-            event = DocumentStartEvent(start_mark, end_mark,
-                                       explicit=False)
-
-            # Prepare the next state.
-            self.states.append(self.parse_document_end)
-            self.state = self.parse_block_node
-
-            return event
-
-        else:
-            return self.parse_document_start()
-
-    def parse_document_start(self):
-
-        # Parse any extra document end indicators.
-        while self.check_token(DocumentEndToken):
-            self.get_token()
-
-        # Parse an explicit document.
-        if not self.check_token(StreamEndToken):
-            token = self.peek_token()
-            start_mark = token.start_mark
-            version, tags = self.process_directives()
-            if not self.check_token(DocumentStartToken):
-                raise ParserError(None, None,
-                                  "expected '<document start>', but found %r"
-                                  % self.peek_token().id,
-                                  self.peek_token().start_mark)
-            token = self.get_token()
-            end_mark = token.end_mark
-            event = DocumentStartEvent(
-                start_mark, end_mark,
-                explicit=True, version=version, tags=tags)
-            self.states.append(self.parse_document_end)
-            self.state = self.parse_document_content
-        else:
-            # Parse the end of the stream.
-            token = self.get_token()
-            event = StreamEndEvent(token.start_mark, token.end_mark,
-                                   comment=token.comment)
-            assert not self.states
-            assert not self.marks
-            self.state = None
-        return event
-
-    def parse_document_end(self):
-
-        # Parse the document end.
-        token = self.peek_token()
-        start_mark = end_mark = token.start_mark
-        explicit = False
-        if self.check_token(DocumentEndToken):
-            token = self.get_token()
-            end_mark = token.end_mark
-            explicit = True
-        event = DocumentEndEvent(start_mark, end_mark, explicit=explicit)
-
-        # Prepare the next state.
-        self.state = self.parse_document_start
-
-        return event
-
-    def parse_document_content(self):
-        if self.check_token(
-           DirectiveToken,
-           DocumentStartToken, DocumentEndToken, StreamEndToken):
-            event = self.process_empty_scalar(self.peek_token().start_mark)
-            self.state = self.states.pop()
-            return event
-        else:
-            return self.parse_block_node()
-
-    def process_directives(self):
-        self.yaml_version = None
-        self.tag_handles = {}
-        while self.check_token(DirectiveToken):
-            token = self.get_token()
-            if token.name == u'YAML':
-                if self.yaml_version is not None:
-                    raise ParserError(
-                        None, None,
-                        "found duplicate YAML directive", token.start_mark)
-                major, minor = token.value
-                if major != 1:
-                    raise ParserError(
-                        None, None,
-                        "found incompatible YAML document (version 1.* is "
-                        "required)",
-                        token.start_mark)
-                self.yaml_version = token.value
-            elif token.name == u'TAG':
-                handle, prefix = token.value
-                if handle in self.tag_handles:
-                    raise ParserError(None, None,
-                                      "duplicate tag handle %r" % utf8(handle),
-                                      token.start_mark)
-                self.tag_handles[handle] = prefix
-        if self.tag_handles:
-            value = self.yaml_version, self.tag_handles.copy()
-        else:
-            value = self.yaml_version, None
-        for key in self.DEFAULT_TAGS:
-            if key not in self.tag_handles:
-                self.tag_handles[key] = self.DEFAULT_TAGS[key]
-        return value
-
-    # block_node_or_indentless_sequence ::= ALIAS
-    #               | properties (block_content | indentless_block_sequence)?
-    #               | block_content
-    #               | indentless_block_sequence
-    # block_node    ::= ALIAS
-    #                   | properties block_content?
-    #                   | block_content
-    # flow_node     ::= ALIAS
-    #                   | properties flow_content?
-    #                   | flow_content
-    # properties    ::= TAG ANCHOR? | ANCHOR TAG?
-    # block_content     ::= block_collection | flow_collection | SCALAR
-    # flow_content      ::= flow_collection | SCALAR
-    # block_collection  ::= block_sequence | block_mapping
-    # flow_collection   ::= flow_sequence | flow_mapping
-
-    def parse_block_node(self):
-        return self.parse_node(block=True)
-
-    def parse_flow_node(self):
-        return self.parse_node()
-
-    def parse_block_node_or_indentless_sequence(self):
-        return self.parse_node(block=True, indentless_sequence=True)
-
-    def transform_tag(self, handle, suffix):
-        return self.tag_handles[handle] + suffix
-
-    def parse_node(self, block=False, indentless_sequence=False):
-        if self.check_token(AliasToken):
-            token = self.get_token()
-            event = AliasEvent(token.value, token.start_mark, token.end_mark)
-            self.state = self.states.pop()
-        else:
-            anchor = None
-            tag = None
-            start_mark = end_mark = tag_mark = None
-            if self.check_token(AnchorToken):
-                token = self.get_token()
-                start_mark = token.start_mark
-                end_mark = token.end_mark
-                anchor = token.value
-                if self.check_token(TagToken):
-                    token = self.get_token()
-                    tag_mark = token.start_mark
-                    end_mark = token.end_mark
-                    tag = token.value
-            elif self.check_token(TagToken):
-                token = self.get_token()
-                start_mark = tag_mark = token.start_mark
-                end_mark = token.end_mark
-                tag = token.value
-                if self.check_token(AnchorToken):
-                    token = self.get_token()
-                    end_mark = token.end_mark
-                    anchor = token.value
-            if tag is not None:
-                handle, suffix = tag
-                if handle is not None:
-                    if handle not in self.tag_handles:
-                        raise ParserError(
-                            "while parsing a node", start_mark,
-                            "found undefined tag handle %r" % utf8(handle),
-                            tag_mark)
-                    tag = self.transform_tag(handle, suffix)
-                else:
-                    tag = suffix
-            # if tag == u'!':
-            #     raise ParserError("while parsing a node", start_mark,
-            #             "found non-specific tag '!'", tag_mark,
-            #      "Please check 'http://pyyaml.org/wiki/YAMLNonSpecificTag'
-            #     and share your opinion.")
-            if start_mark is None:
-                start_mark = end_mark = self.peek_token().start_mark
-            event = None
-            implicit = (tag is None or tag == u'!')
-            if indentless_sequence and self.check_token(BlockEntryToken):
-                end_mark = self.peek_token().end_mark
-                event = SequenceStartEvent(anchor, tag, implicit,
-                                           start_mark, end_mark)
-                self.state = self.parse_indentless_sequence_entry
-            else:
-                if self.check_token(ScalarToken):
-                    token = self.get_token()
-                    end_mark = token.end_mark
-                    if (token.plain and tag is None) or tag == u'!':
-                        implicit = (True, False)
-                    elif tag is None:
-                        implicit = (False, True)
-                    else:
-                        implicit = (False, False)
-                    event = ScalarEvent(
-                        anchor, tag, implicit, token.value,
-                        start_mark, end_mark, style=token.style,
-                        comment=token.comment
-                    )
-                    self.state = self.states.pop()
-                elif self.check_token(FlowSequenceStartToken):
-                    end_mark = self.peek_token().end_mark
-                    event = SequenceStartEvent(
-                        anchor, tag, implicit,
-                        start_mark, end_mark, flow_style=True)
-                    self.state = self.parse_flow_sequence_first_entry
-                elif self.check_token(FlowMappingStartToken):
-                    end_mark = self.peek_token().end_mark
-                    event = MappingStartEvent(
-                        anchor, tag, implicit,
-                        start_mark, end_mark, flow_style=True)
-                    self.state = self.parse_flow_mapping_first_key
-                elif block and self.check_token(BlockSequenceStartToken):
-                    end_mark = self.peek_token().start_mark
-                    # should inserting the comment be dependent on the
-                    # indentation?
-                    pt = self.peek_token()
-                    comment = pt.comment
-                    # print('pt0', type(pt))
-                    if comment is None or comment[1] is None:
-                        comment = pt.split_comment()
-                    # print('pt1', comment)
-                    event = SequenceStartEvent(
-                        anchor, tag, implicit, start_mark, end_mark,
-                        flow_style=False,
-                        comment=comment,
-                    )
-                    self.state = self.parse_block_sequence_first_entry
-                elif block and self.check_token(BlockMappingStartToken):
-                    end_mark = self.peek_token().start_mark
-                    comment = self.peek_token().comment
-                    event = MappingStartEvent(
-                        anchor, tag, implicit, start_mark, end_mark,
-                        flow_style=False, comment=comment)
-                    self.state = self.parse_block_mapping_first_key
-                elif anchor is not None or tag is not None:
-                    # Empty scalars are allowed even if a tag or an anchor is
-                    # specified.
-                    event = ScalarEvent(anchor, tag, (implicit, False), u'',
-                                        start_mark, end_mark)
-                    self.state = self.states.pop()
-                else:
-                    if block:
-                        node = 'block'
-                    else:
-                        node = 'flow'
-                    token = self.peek_token()
-                    raise ParserError(
-                        "while parsing a %s node" % node, start_mark,
-                        "expected the node content, but found %r" % token.id,
-                        token.start_mark)
-        return event
-
-    # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)*
-    #                                                               BLOCK-END
-
-    def parse_block_sequence_first_entry(self):
-        token = self.get_token()
-        # move any comment from start token
-        # token.move_comment(self.peek_token())
-        self.marks.append(token.start_mark)
-        return self.parse_block_sequence_entry()
-
-    def parse_block_sequence_entry(self):
-        if self.check_token(BlockEntryToken):
-            token = self.get_token()
-            token.move_comment(self.peek_token())
-            if not self.check_token(BlockEntryToken, BlockEndToken):
-                self.states.append(self.parse_block_sequence_entry)
-                return self.parse_block_node()
-            else:
-                self.state = self.parse_block_sequence_entry
-                return self.process_empty_scalar(token.end_mark)
-        if not self.check_token(BlockEndToken):
-            token = self.peek_token()
-            raise ParserError(
-                "while parsing a block collection", self.marks[-1],
-                "expected <block end>, but found %r" %
-                token.id, token.start_mark)
-        token = self.get_token()  # BlockEndToken
-        event = SequenceEndEvent(token.start_mark, token.end_mark,
-                                 comment=token.comment)
-        self.state = self.states.pop()
-        self.marks.pop()
-        return event
-
-    # indentless_sequence ::= (BLOCK-ENTRY block_node?)+
-
-    # indentless_sequence?
-    # sequence:
-    # - entry
-    #  - nested
-
-    def parse_indentless_sequence_entry(self):
-        if self.check_token(BlockEntryToken):
-            token = self.get_token()
-            token.move_comment(self.peek_token())
-            if not self.check_token(BlockEntryToken,
-                                    KeyToken, ValueToken, BlockEndToken):
-                self.states.append(self.parse_indentless_sequence_entry)
-                return self.parse_block_node()
-            else:
-                self.state = self.parse_indentless_sequence_entry
-                return self.process_empty_scalar(token.end_mark)
-        token = self.peek_token()
-        event = SequenceEndEvent(token.start_mark, token.start_mark,
-                                 comment=token.comment)
-        self.state = self.states.pop()
-        return event
-
-    # block_mapping     ::= BLOCK-MAPPING_START
-    #                       ((KEY block_node_or_indentless_sequence?)?
-    #                       (VALUE block_node_or_indentless_sequence?)?)*
-    #                       BLOCK-END
-
-    def parse_block_mapping_first_key(self):
-        token = self.get_token()
-        self.marks.append(token.start_mark)
-        return self.parse_block_mapping_key()
-
-    def parse_block_mapping_key(self):
-        if self.check_token(KeyToken):
-            token = self.get_token()
-            token.move_comment(self.peek_token())
-            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
-                self.states.append(self.parse_block_mapping_value)
-                return self.parse_block_node_or_indentless_sequence()
-            else:
-                self.state = self.parse_block_mapping_value
-                return self.process_empty_scalar(token.end_mark)
-        if not self.check_token(BlockEndToken):
-            token = self.peek_token()
-            raise ParserError(
-                "while parsing a block mapping", self.marks[-1],
-                "expected <block end>, but found %r" % token.id,
-                token.start_mark)
-        token = self.get_token()
-        token.move_comment(self.peek_token())
-        event = MappingEndEvent(token.start_mark, token.end_mark,
-                                comment=token.comment)
-        self.state = self.states.pop()
-        self.marks.pop()
-        return event
-
-    def parse_block_mapping_value(self):
-        if self.check_token(ValueToken):
-            token = self.get_token()
-            # value token might have post comment move it to e.g. block
-            token.move_comment(self.peek_token())
-            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
-                self.states.append(self.parse_block_mapping_key)
-                return self.parse_block_node_or_indentless_sequence()
-            else:
-                self.state = self.parse_block_mapping_key
-                return self.process_empty_scalar(token.end_mark)
-        else:
-            self.state = self.parse_block_mapping_key
-            token = self.peek_token()
-            return self.process_empty_scalar(token.start_mark)
-
-    # flow_sequence     ::= FLOW-SEQUENCE-START
-    #                       (flow_sequence_entry FLOW-ENTRY)*
-    #                       flow_sequence_entry?
-    #                       FLOW-SEQUENCE-END
-    # flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
-    #
-    # Note that while production rules for both flow_sequence_entry and
-    # flow_mapping_entry are equal, their interpretations are different.
-    # For `flow_sequence_entry`, the part `KEY flow_node? (VALUE flow_node?)?`
-    # generate an inline mapping (set syntax).
-
-    def parse_flow_sequence_first_entry(self):
-        token = self.get_token()
-        self.marks.append(token.start_mark)
-        return self.parse_flow_sequence_entry(first=True)
-
-    def parse_flow_sequence_entry(self, first=False):
-        if not self.check_token(FlowSequenceEndToken):
-            if not first:
-                if self.check_token(FlowEntryToken):
-                    self.get_token()
-                else:
-                    token = self.peek_token()
-                    raise ParserError(
-                        "while parsing a flow sequence", self.marks[-1],
-                        "expected ',' or ']', but got %r" % token.id,
-                        token.start_mark)
-
-            if self.check_token(KeyToken):
-                token = self.peek_token()
-                event = MappingStartEvent(None, None, True,
-                                          token.start_mark, token.end_mark,
-                                          flow_style=True)
-                self.state = self.parse_flow_sequence_entry_mapping_key
-                return event
-            elif not self.check_token(FlowSequenceEndToken):
-                self.states.append(self.parse_flow_sequence_entry)
-                return self.parse_flow_node()
-        token = self.get_token()
-        event = SequenceEndEvent(token.start_mark, token.end_mark,
-                                 comment=token.comment)
-        self.state = self.states.pop()
-        self.marks.pop()
-        return event
-
-    def parse_flow_sequence_entry_mapping_key(self):
-        token = self.get_token()
-        if not self.check_token(ValueToken,
-                                FlowEntryToken, FlowSequenceEndToken):
-            self.states.append(self.parse_flow_sequence_entry_mapping_value)
-            return self.parse_flow_node()
-        else:
-            self.state = self.parse_flow_sequence_entry_mapping_value
-            return self.process_empty_scalar(token.end_mark)
-
-    def parse_flow_sequence_entry_mapping_value(self):
-        if self.check_token(ValueToken):
-            token = self.get_token()
-            if not self.check_token(FlowEntryToken, FlowSequenceEndToken):
-                self.states.append(self.parse_flow_sequence_entry_mapping_end)
-                return self.parse_flow_node()
-            else:
-                self.state = self.parse_flow_sequence_entry_mapping_end
-                return self.process_empty_scalar(token.end_mark)
-        else:
-            self.state = self.parse_flow_sequence_entry_mapping_end
-            token = self.peek_token()
-            return self.process_empty_scalar(token.start_mark)
-
-    def parse_flow_sequence_entry_mapping_end(self):
-        self.state = self.parse_flow_sequence_entry
-        token = self.peek_token()
-        return MappingEndEvent(token.start_mark, token.start_mark)
-
-    # flow_mapping  ::= FLOW-MAPPING-START
-    #                   (flow_mapping_entry FLOW-ENTRY)*
-    #                   flow_mapping_entry?
-    #                   FLOW-MAPPING-END
-    # flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?
-
-    def parse_flow_mapping_first_key(self):
-        token = self.get_token()
-        self.marks.append(token.start_mark)
-        return self.parse_flow_mapping_key(first=True)
-
-    def parse_flow_mapping_key(self, first=False):
-        if not self.check_token(FlowMappingEndToken):
-            if not first:
-                if self.check_token(FlowEntryToken):
-                    self.get_token()
-                else:
-                    token = self.peek_token()
-                    raise ParserError(
-                        "while parsing a flow mapping", self.marks[-1],
-                        "expected ',' or '}', but got %r" % token.id,
-                        token.start_mark)
-            if self.check_token(KeyToken):
-                token = self.get_token()
-                if not self.check_token(ValueToken,
-                                        FlowEntryToken, FlowMappingEndToken):
-                    self.states.append(self.parse_flow_mapping_value)
-                    return self.parse_flow_node()
-                else:
-                    self.state = self.parse_flow_mapping_value
-                    return self.process_empty_scalar(token.end_mark)
-            elif not self.check_token(FlowMappingEndToken):
-                self.states.append(self.parse_flow_mapping_empty_value)
-                return self.parse_flow_node()
-        token = self.get_token()
-        event = MappingEndEvent(token.start_mark, token.end_mark,
-                                comment=token.comment)
-        self.state = self.states.pop()
-        self.marks.pop()
-        return event
-
-    def parse_flow_mapping_value(self):
-        if self.check_token(ValueToken):
-            token = self.get_token()
-            if not self.check_token(FlowEntryToken, FlowMappingEndToken):
-                self.states.append(self.parse_flow_mapping_key)
-                return self.parse_flow_node()
-            else:
-                self.state = self.parse_flow_mapping_key
-                return self.process_empty_scalar(token.end_mark)
-        else:
-            self.state = self.parse_flow_mapping_key
-            token = self.peek_token()
-            return self.process_empty_scalar(token.start_mark)
-
-    def parse_flow_mapping_empty_value(self):
-        self.state = self.parse_flow_mapping_key
-        return self.process_empty_scalar(self.peek_token().start_mark)
-
-    def process_empty_scalar(self, mark):
-        return ScalarEvent(None, None, (True, False), u'', mark, mark)
-
-
-class RoundTripParser(Parser):
-    """roundtrip is a safe loader, that wants to see the unmangled tag"""
-    def transform_tag(self, handle, suffix):
-        # return self.tag_handles[handle]+suffix
-        if handle == '!!' and suffix in (u'null', u'bool', u'int', u'float', u'binary',
-                                         u'timestamp', u'omap', u'pairs', u'set', u'str',
-                                         u'seq', u'map'):
-            return Parser.transform_tag(self, handle, suffix)
-        return handle+suffix

lib/spack/external/ruamel/yaml/reader.py

@@ -1,213 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-# This module contains abstractions for the input stream. You don't have to
-# looks further, there are no pretty code.
-#
-# We define two classes here.
-#
-#   Mark(source, line, column)
-# It's just a record and its only use is producing nice error messages.
-# Parser does not use it for any other purposes.
-#
-#   Reader(source, data)
-# Reader determines the encoding of `data` and converts it to unicode.
-# Reader provides the following methods and attributes:
-#   reader.peek(length=1) - return the next `length` characters
-#   reader.forward(length=1) - move the current position to `length`
-#      characters.
-#   reader.index - the number of the current character.
-#   reader.line, stream.column - the line and the column of the current
-#      character.
-
-import codecs
-import re
-
-try:
-    from .error import YAMLError, Mark
-    from .compat import text_type, binary_type, PY3
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.error import YAMLError, Mark
-    from ruamel.yaml.compat import text_type, binary_type, PY3
-
-__all__ = ['Reader', 'ReaderError']
-
-
-class ReaderError(YAMLError):
-
-    def __init__(self, name, position, character, encoding, reason):
-        self.name = name
-        self.character = character
-        self.position = position
-        self.encoding = encoding
-        self.reason = reason
-
-    def __str__(self):
-        if isinstance(self.character, binary_type):
-            return "'%s' codec can't decode byte #x%02x: %s\n"  \
-                   "  in \"%s\", position %d"    \
-                   % (self.encoding, ord(self.character), self.reason,
-                      self.name, self.position)
-        else:
-            return "unacceptable character #x%04x: %s\n"    \
-                   "  in \"%s\", position %d"    \
-                   % (self.character, self.reason,
-                      self.name, self.position)
-
-
-class Reader(object):
-    # Reader:
-    # - determines the data encoding and converts it to a unicode string,
-    # - checks if characters are in allowed range,
-    # - adds '\0' to the end.
-
-    # Reader accepts
-    #  - a `str` object (PY2) / a `bytes` object (PY3),
-    #  - a `unicode` object (PY2) / a `str` object (PY3),
-    #  - a file-like object with its `read` method returning `str`,
-    #  - a file-like object with its `read` method returning `unicode`.
-
-    # Yeah, it's ugly and slow.
-
-    def __init__(self, stream):
-        self.name = None
-        self.stream = None
-        self.stream_pointer = 0
-        self.eof = True
-        self.buffer = u''
-        self.pointer = 0
-        self.raw_buffer = None
-        self.raw_decode = None
-        self.encoding = None
-        self.index = 0
-        self.line = 0
-        self.column = 0
-        if isinstance(stream, text_type):
-            self.name = "<unicode string>"
-            self.check_printable(stream)
-            self.buffer = stream+u'\0'
-        elif isinstance(stream, binary_type):
-            self.name = "<byte string>"
-            self.raw_buffer = stream
-            self.determine_encoding()
-        else:
-            self.stream = stream
-            self.name = getattr(stream, 'name', "<file>")
-            self.eof = False
-            self.raw_buffer = None
-            self.determine_encoding()
-
-    def peek(self, index=0):
-        try:
-            return self.buffer[self.pointer+index]
-        except IndexError:
-            self.update(index+1)
-            return self.buffer[self.pointer+index]
-
-    def prefix(self, length=1):
-        if self.pointer+length >= len(self.buffer):
-            self.update(length)
-        return self.buffer[self.pointer:self.pointer+length]
-
-    def forward(self, length=1):
-        if self.pointer+length+1 >= len(self.buffer):
-            self.update(length+1)
-        while length:
-            ch = self.buffer[self.pointer]
-            self.pointer += 1
-            self.index += 1
-            if ch in u'\n\x85\u2028\u2029'  \
-                    or (ch == u'\r' and self.buffer[self.pointer] != u'\n'):
-                self.line += 1
-                self.column = 0
-            elif ch != u'\uFEFF':
-                self.column += 1
-            length -= 1
-
-    def get_mark(self):
-        if self.stream is None:
-            return Mark(self.name, self.index, self.line, self.column,
-                        self.buffer, self.pointer)
-        else:
-            return Mark(self.name, self.index, self.line, self.column,
-                        None, None)
-
-    def determine_encoding(self):
-        while not self.eof and (self.raw_buffer is None or
-                                len(self.raw_buffer) < 2):
-            self.update_raw()
-        if isinstance(self.raw_buffer, binary_type):
-            if self.raw_buffer.startswith(codecs.BOM_UTF16_LE):
-                self.raw_decode = codecs.utf_16_le_decode
-                self.encoding = 'utf-16-le'
-            elif self.raw_buffer.startswith(codecs.BOM_UTF16_BE):
-                self.raw_decode = codecs.utf_16_be_decode
-                self.encoding = 'utf-16-be'
-            else:
-                self.raw_decode = codecs.utf_8_decode
-                self.encoding = 'utf-8'
-        self.update(1)
-
-    NON_PRINTABLE = re.compile(
-        u'[^\x09\x0A\x0D\x20-\x7E\x85\xA0-\uD7FF\uE000-\uFFFD]')
-
-    def check_printable(self, data):
-        match = self.NON_PRINTABLE.search(data)
-        if match:
-            character = match.group()
-            position = self.index+(len(self.buffer)-self.pointer)+match.start()
-            raise ReaderError(self.name, position, ord(character),
-                              'unicode', "special characters are not allowed")
-
-    def update(self, length):
-        if self.raw_buffer is None:
-            return
-        self.buffer = self.buffer[self.pointer:]
-        self.pointer = 0
-        while len(self.buffer) < length:
-            if not self.eof:
-                self.update_raw()
-            if self.raw_decode is not None:
-                try:
-                    data, converted = self.raw_decode(self.raw_buffer,
-                                                      'strict', self.eof)
-                except UnicodeDecodeError as exc:
-                    if PY3:
-                        character = self.raw_buffer[exc.start]
-                    else:
-                        character = exc.object[exc.start]
-                    if self.stream is not None:
-                        position = self.stream_pointer - \
-                            len(self.raw_buffer) + exc.start
-                    else:
-                        position = exc.start
-                    raise ReaderError(self.name, position, character,
-                                      exc.encoding, exc.reason)
-            else:
-                data = self.raw_buffer
-                converted = len(data)
-            self.check_printable(data)
-            self.buffer += data
-            self.raw_buffer = self.raw_buffer[converted:]
-            if self.eof:
-                self.buffer += u'\0'
-                self.raw_buffer = None
-                break
-
-    def update_raw(self, size=None):
-        if size is None:
-            size = 4096 if PY3 else 1024
-        data = self.stream.read(size)
-        if self.raw_buffer is None:
-            self.raw_buffer = data
-        else:
-            self.raw_buffer += data
-        self.stream_pointer += len(data)
-        if not data:
-            self.eof = True
-
-# try:
-#     import psyco
-#     psyco.bind(Reader)
-# except ImportError:
-#     pass

lib/spack/external/ruamel/yaml/representer.py

@@ -1,888 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-from __future__ import print_function
-
-try:
-    from .error import *                                  # NOQA
-    from .nodes import *                                  # NOQA
-    from .compat import text_type, binary_type, to_unicode, PY2, PY3, ordereddict
-    from .scalarstring import *                           # NOQA
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.error import *                       # NOQA
-    from ruamel.yaml.nodes import *                       # NOQA
-    from ruamel.yaml.compat import text_type, binary_type, to_unicode, PY2, PY3, ordereddict
-    from ruamel.yaml.scalarstring import *                # NOQA
-
-
-import datetime
-import sys
-import types
-if PY3:
-    import copyreg
-    import base64
-else:
-    import copy_reg as copyreg
-
-
-__all__ = ['BaseRepresenter', 'SafeRepresenter', 'Representer',
-           'RepresenterError', 'RoundTripRepresenter']
-
-
-class RepresenterError(YAMLError):
-    pass
-
-
-class BaseRepresenter(object):
-
-    yaml_representers = {}
-    yaml_multi_representers = {}
-
-    def __init__(self, default_style=None, default_flow_style=None):
-        self.default_style = default_style
-        self.default_flow_style = default_flow_style
-        self.represented_objects = {}
-        self.object_keeper = []
-        self.alias_key = None
-
-    def represent(self, data):
-        node = self.represent_data(data)
-        self.serialize(node)
-        self.represented_objects = {}
-        self.object_keeper = []
-        self.alias_key = None
-
-    if PY2:
-        def get_classobj_bases(self, cls):
-            bases = [cls]
-            for base in cls.__bases__:
-                bases.extend(self.get_classobj_bases(base))
-            return bases
-
-    def represent_data(self, data):
-        if self.ignore_aliases(data):
-            self.alias_key = None
-        else:
-            self.alias_key = id(data)
-        if self.alias_key is not None:
-            if self.alias_key in self.represented_objects:
-                node = self.represented_objects[self.alias_key]
-                # if node is None:
-                #     raise RepresenterError(
-                #          "recursive objects are not allowed: %r" % data)
-                return node
-            # self.represented_objects[alias_key] = None
-            self.object_keeper.append(data)
-        data_types = type(data).__mro__
-        if PY2:
-            # if type(data) is types.InstanceType:
-            if isinstance(data, types.InstanceType):
-                data_types = self.get_classobj_bases(data.__class__) + \
-                    list(data_types)
-        if data_types[0] in self.yaml_representers:
-            node = self.yaml_representers[data_types[0]](self, data)
-        else:
-            for data_type in data_types:
-                if data_type in self.yaml_multi_representers:
-                    node = self.yaml_multi_representers[data_type](self, data)
-                    break
-            else:
-                if None in self.yaml_multi_representers:
-                    node = self.yaml_multi_representers[None](self, data)
-                elif None in self.yaml_representers:
-                    node = self.yaml_representers[None](self, data)
-                else:
-                    node = ScalarNode(None, text_type(data))
-        # if alias_key is not None:
-        #     self.represented_objects[alias_key] = node
-        return node
-
-    def represent_key(self, data):
-        """
-        David Fraser: Extract a method to represent keys in mappings, so that
-        a subclass can choose not to quote them (for example)
-        used in repesent_mapping
-        https://bitbucket.org/davidfraser/pyyaml/commits/d81df6eb95f20cac4a79eed95ae553b5c6f77b8c
-        """
-        return self.represent_data(data)
-
-    @classmethod
-    def add_representer(cls, data_type, representer):
-        if 'yaml_representers' not in cls.__dict__:
-            cls.yaml_representers = cls.yaml_representers.copy()
-        cls.yaml_representers[data_type] = representer
-
-    @classmethod
-    def add_multi_representer(cls, data_type, representer):
-        if 'yaml_multi_representers' not in cls.__dict__:
-            cls.yaml_multi_representers = cls.yaml_multi_representers.copy()
-        cls.yaml_multi_representers[data_type] = representer
-
-    def represent_scalar(self, tag, value, style=None):
-        if style is None:
-            style = self.default_style
-        node = ScalarNode(tag, value, style=style)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        return node
-
-    def represent_sequence(self, tag, sequence, flow_style=None):
-        value = []
-        node = SequenceNode(tag, value, flow_style=flow_style)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        for item in sequence:
-            node_item = self.represent_data(item)
-            if not (isinstance(node_item, ScalarNode) and not node_item.style):
-                best_style = False
-            value.append(node_item)
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        return node
-
-    def represent_omap(self, tag, omap, flow_style=None):
-        value = []
-        node = SequenceNode(tag, value, flow_style=flow_style)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        for item_key in omap:
-            item_val = omap[item_key]
-            node_item = self.represent_data({item_key: item_val})
-            # if not (isinstance(node_item, ScalarNode) \
-            #    and not node_item.style):
-            #     best_style = False
-            value.append(node_item)
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        return node
-
-    def represent_mapping(self, tag, mapping, flow_style=None):
-        value = []
-        node = MappingNode(tag, value, flow_style=flow_style)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        if hasattr(mapping, 'items'):
-            mapping = list(mapping.items())
-            try:
-                mapping = sorted(mapping)
-            except TypeError:
-                pass
-        for item_key, item_value in mapping:
-            node_key = self.represent_key(item_key)
-            node_value = self.represent_data(item_value)
-            if not (isinstance(node_key, ScalarNode) and not node_key.style):
-                best_style = False
-            if not (isinstance(node_value, ScalarNode) and not
-                    node_value.style):
-                best_style = False
-            value.append((node_key, node_value))
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        return node
-
-    def ignore_aliases(self, data):
-        return False
-
-
-class SafeRepresenter(BaseRepresenter):
-
-    def ignore_aliases(self, data):
-        # https://docs.python.org/3/reference/expressions.html#parenthesized-forms :
-        # "i.e. two occurrences of the empty tuple may or may not yield the same object"
-        # so "data is ()" should not be used
-        if data is None or data == ():
-            return True
-        if isinstance(data, (binary_type, text_type, bool, int, float)):
-            return True
-
-    def represent_none(self, data):
-        return self.represent_scalar(u'tag:yaml.org,2002:null',
-                                     u'null')
-
-    if PY3:
-        def represent_str(self, data):
-            return self.represent_scalar(u'tag:yaml.org,2002:str', data)
-
-        def represent_binary(self, data):
-            if hasattr(base64, 'encodebytes'):
-                data = base64.encodebytes(data).decode('ascii')
-            else:
-                data = base64.encodestring(data).decode('ascii')
-            return self.represent_scalar(u'tag:yaml.org,2002:binary', data,
-                                         style='|')
-    else:
-        def represent_str(self, data):
-            tag = None
-            style = None
-            try:
-                data = unicode(data, 'ascii')
-                tag = u'tag:yaml.org,2002:str'
-            except UnicodeDecodeError:
-                try:
-                    data = unicode(data, 'utf-8')
-                    tag = u'tag:yaml.org,2002:str'
-                except UnicodeDecodeError:
-                    data = data.encode('base64')
-                    tag = u'tag:yaml.org,2002:binary'
-                    style = '|'
-            return self.represent_scalar(tag, data, style=style)
-
-        def represent_unicode(self, data):
-            return self.represent_scalar(u'tag:yaml.org,2002:str', data)
-
-    def represent_bool(self, data):
-        if data:
-            value = u'true'
-        else:
-            value = u'false'
-        return self.represent_scalar(u'tag:yaml.org,2002:bool', value)
-
-    def represent_int(self, data):
-        return self.represent_scalar(u'tag:yaml.org,2002:int', text_type(data))
-
-    if PY2:
-        def represent_long(self, data):
-            return self.represent_scalar(u'tag:yaml.org,2002:int',
-                                         text_type(data))
-
-    inf_value = 1e300
-    while repr(inf_value) != repr(inf_value*inf_value):
-        inf_value *= inf_value
-
-    def represent_float(self, data):
-        if data != data or (data == 0.0 and data == 1.0):
-            value = u'.nan'
-        elif data == self.inf_value:
-            value = u'.inf'
-        elif data == -self.inf_value:
-            value = u'-.inf'
-        else:
-            value = to_unicode(repr(data)).lower()
-            # Note that in some cases `repr(data)` represents a float number
-            # without the decimal parts.  For instance:
-            #   >>> repr(1e17)
-            #   '1e17'
-            # Unfortunately, this is not a valid float representation according
-            # to the definition of the `!!float` tag.  We fix this by adding
-            # '.0' before the 'e' symbol.
-            if u'.' not in value and u'e' in value:
-                value = value.replace(u'e', u'.0e', 1)
-        return self.represent_scalar(u'tag:yaml.org,2002:float', value)
-
-    def represent_list(self, data):
-        # pairs = (len(data) > 0 and isinstance(data, list))
-        # if pairs:
-        #     for item in data:
-        #         if not isinstance(item, tuple) or len(item) != 2:
-        #             pairs = False
-        #             break
-        # if not pairs:
-            return self.represent_sequence(u'tag:yaml.org,2002:seq', data)
-        # value = []
-        # for item_key, item_value in data:
-        #     value.append(self.represent_mapping(u'tag:yaml.org,2002:map',
-        #         [(item_key, item_value)]))
-        # return SequenceNode(u'tag:yaml.org,2002:pairs', value)
-
-    def represent_dict(self, data):
-        return self.represent_mapping(u'tag:yaml.org,2002:map', data)
-
-    def represent_ordereddict(self, data):
-        return self.represent_omap(u'tag:yaml.org,2002:omap', data)
-
-    def represent_set(self, data):
-        value = {}
-        for key in data:
-            value[key] = None
-        return self.represent_mapping(u'tag:yaml.org,2002:set', value)
-
-    def represent_date(self, data):
-        value = to_unicode(data.isoformat())
-        return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
-
-    def represent_datetime(self, data):
-        value = to_unicode(data.isoformat(' '))
-        return self.represent_scalar(u'tag:yaml.org,2002:timestamp', value)
-
-    def represent_yaml_object(self, tag, data, cls, flow_style=None):
-        if hasattr(data, '__getstate__'):
-            state = data.__getstate__()
-        else:
-            state = data.__dict__.copy()
-        return self.represent_mapping(tag, state, flow_style=flow_style)
-
-    def represent_undefined(self, data):
-        raise RepresenterError("cannot represent an object: %s" % data)
-
-SafeRepresenter.add_representer(type(None),
-                                SafeRepresenter.represent_none)
-
-SafeRepresenter.add_representer(str,
-                                SafeRepresenter.represent_str)
-
-if PY2:
-    SafeRepresenter.add_representer(unicode,
-                                    SafeRepresenter.represent_unicode)
-else:
-    SafeRepresenter.add_representer(bytes,
-                                    SafeRepresenter.represent_binary)
-
-SafeRepresenter.add_representer(bool,
-                                SafeRepresenter.represent_bool)
-
-SafeRepresenter.add_representer(int,
-                                SafeRepresenter.represent_int)
-
-if PY2:
-    SafeRepresenter.add_representer(long,
-                                    SafeRepresenter.represent_long)
-
-SafeRepresenter.add_representer(float,
-                                SafeRepresenter.represent_float)
-
-SafeRepresenter.add_representer(list,
-                                SafeRepresenter.represent_list)
-
-SafeRepresenter.add_representer(tuple,
-                                SafeRepresenter.represent_list)
-
-SafeRepresenter.add_representer(dict,
-                                SafeRepresenter.represent_dict)
-
-SafeRepresenter.add_representer(set,
-                                SafeRepresenter.represent_set)
-
-SafeRepresenter.add_representer(ordereddict,
-                                SafeRepresenter.represent_ordereddict)
-
-SafeRepresenter.add_representer(datetime.date,
-                                SafeRepresenter.represent_date)
-
-SafeRepresenter.add_representer(datetime.datetime,
-                                SafeRepresenter.represent_datetime)
-
-SafeRepresenter.add_representer(None,
-                                SafeRepresenter.represent_undefined)
-
-
-class Representer(SafeRepresenter):
-    if PY2:
-        def represent_str(self, data):
-            tag = None
-            style = None
-            try:
-                data = unicode(data, 'ascii')
-                tag = u'tag:yaml.org,2002:str'
-            except UnicodeDecodeError:
-                try:
-                    data = unicode(data, 'utf-8')
-                    tag = u'tag:yaml.org,2002:python/str'
-                except UnicodeDecodeError:
-                    data = data.encode('base64')
-                    tag = u'tag:yaml.org,2002:binary'
-                    style = '|'
-            return self.represent_scalar(tag, data, style=style)
-
-        def represent_unicode(self, data):
-            tag = None
-            try:
-                data.encode('ascii')
-                tag = u'tag:yaml.org,2002:python/unicode'
-            except UnicodeEncodeError:
-                tag = u'tag:yaml.org,2002:str'
-            return self.represent_scalar(tag, data)
-
-        def represent_long(self, data):
-            tag = u'tag:yaml.org,2002:int'
-            if int(data) is not data:
-                tag = u'tag:yaml.org,2002:python/long'
-            return self.represent_scalar(tag, to_unicode(data))
-
-    def represent_complex(self, data):
-        if data.imag == 0.0:
-            data = u'%r' % data.real
-        elif data.real == 0.0:
-            data = u'%rj' % data.imag
-        elif data.imag > 0:
-            data = u'%r+%rj' % (data.real, data.imag)
-        else:
-            data = u'%r%rj' % (data.real, data.imag)
-        return self.represent_scalar(u'tag:yaml.org,2002:python/complex', data)
-
-    def represent_tuple(self, data):
-        return self.represent_sequence(u'tag:yaml.org,2002:python/tuple', data)
-
-    def represent_name(self, data):
-        name = u'%s.%s' % (data.__module__, data.__name__)
-        return self.represent_scalar(u'tag:yaml.org,2002:python/name:' +
-                                     name, u'')
-
-    def represent_module(self, data):
-        return self.represent_scalar(
-            u'tag:yaml.org,2002:python/module:'+data.__name__, u'')
-
-    if PY2:
-        def represent_instance(self, data):
-            # For instances of classic classes, we use __getinitargs__ and
-            # __getstate__ to serialize the data.
-
-            # If data.__getinitargs__ exists, the object must be reconstructed
-            # by calling cls(**args), where args is a tuple returned by
-            # __getinitargs__. Otherwise, the cls.__init__ method should never
-            # be called and the class instance is created by instantiating a
-            # trivial class and assigning to the instance's __class__ variable.
-
-            # If data.__getstate__ exists, it returns the state of the object.
-            # Otherwise, the state of the object is data.__dict__.
-
-            # We produce either a !!python/object or !!python/object/new node.
-            # If data.__getinitargs__ does not exist and state is a dictionary,
-            # we produce a !!python/object node . Otherwise we produce a
-            # !!python/object/new node.
-
-            cls = data.__class__
-            class_name = u'%s.%s' % (cls.__module__, cls.__name__)
-            args = None
-            state = None
-            if hasattr(data, '__getinitargs__'):
-                args = list(data.__getinitargs__())
-            if hasattr(data, '__getstate__'):
-                state = data.__getstate__()
-            else:
-                state = data.__dict__
-            if args is None and isinstance(state, dict):
-                return self.represent_mapping(
-                    u'tag:yaml.org,2002:python/object:'+class_name, state)
-            if isinstance(state, dict) and not state:
-                return self.represent_sequence(
-                    u'tag:yaml.org,2002:python/object/new:' +
-                    class_name, args)
-            value = {}
-            if args:
-                value['args'] = args
-            value['state'] = state
-            return self.represent_mapping(
-                u'tag:yaml.org,2002:python/object/new:'+class_name, value)
-
-    def represent_object(self, data):
-        # We use __reduce__ API to save the data. data.__reduce__ returns
-        # a tuple of length 2-5:
-        #   (function, args, state, listitems, dictitems)
-
-        # For reconstructing, we calls function(*args), then set its state,
-        # listitems, and dictitems if they are not None.
-
-        # A special case is when function.__name__ == '__newobj__'. In this
-        # case we create the object with args[0].__new__(*args).
-
-        # Another special case is when __reduce__ returns a string - we don't
-        # support it.
-
-        # We produce a !!python/object, !!python/object/new or
-        # !!python/object/apply node.
-
-        cls = type(data)
-        if cls in copyreg.dispatch_table:
-            reduce = copyreg.dispatch_table[cls](data)
-        elif hasattr(data, '__reduce_ex__'):
-            reduce = data.__reduce_ex__(2)
-        elif hasattr(data, '__reduce__'):
-            reduce = data.__reduce__()
-        else:
-            raise RepresenterError("cannot represent object: %r" % data)
-        reduce = (list(reduce)+[None]*5)[:5]
-        function, args, state, listitems, dictitems = reduce
-        args = list(args)
-        if state is None:
-            state = {}
-        if listitems is not None:
-            listitems = list(listitems)
-        if dictitems is not None:
-            dictitems = dict(dictitems)
-        if function.__name__ == '__newobj__':
-            function = args[0]
-            args = args[1:]
-            tag = u'tag:yaml.org,2002:python/object/new:'
-            newobj = True
-        else:
-            tag = u'tag:yaml.org,2002:python/object/apply:'
-            newobj = False
-        function_name = u'%s.%s' % (function.__module__, function.__name__)
-        if not args and not listitems and not dictitems \
-                and isinstance(state, dict) and newobj:
-            return self.represent_mapping(
-                u'tag:yaml.org,2002:python/object:'+function_name, state)
-        if not listitems and not dictitems  \
-                and isinstance(state, dict) and not state:
-            return self.represent_sequence(tag+function_name, args)
-        value = {}
-        if args:
-            value['args'] = args
-        if state or not isinstance(state, dict):
-            value['state'] = state
-        if listitems:
-            value['listitems'] = listitems
-        if dictitems:
-            value['dictitems'] = dictitems
-        return self.represent_mapping(tag+function_name, value)
-
-if PY2:
-    Representer.add_representer(str,
-                                Representer.represent_str)
-
-    Representer.add_representer(unicode,
-                                Representer.represent_unicode)
-
-    Representer.add_representer(long,
-                                Representer.represent_long)
-
-Representer.add_representer(complex,
-                            Representer.represent_complex)
-
-Representer.add_representer(tuple,
-                            Representer.represent_tuple)
-
-Representer.add_representer(type,
-                            Representer.represent_name)
-
-if PY2:
-    Representer.add_representer(types.ClassType,
-                                Representer.represent_name)
-
-Representer.add_representer(types.FunctionType,
-                            Representer.represent_name)
-
-Representer.add_representer(types.BuiltinFunctionType,
-                            Representer.represent_name)
-
-Representer.add_representer(types.ModuleType,
-                            Representer.represent_module)
-
-if PY2:
-    Representer.add_multi_representer(types.InstanceType,
-                                      Representer.represent_instance)
-
-Representer.add_multi_representer(object,
-                                  Representer.represent_object)
-
-
-try:
-    from .comments import CommentedMap, CommentedOrderedMap, CommentedSeq, \
-        CommentedSet, comment_attrib, merge_attrib
-except ImportError:  # for Jython
-    from ruamel.yaml.comments import CommentedMap, CommentedOrderedMap, \
-        CommentedSeq, CommentedSet, comment_attrib, merge_attrib
-
-
-class RoundTripRepresenter(SafeRepresenter):
-    # need to add type here and write out the .comment
-    # in serializer and emitter
-
-    def __init__(self, default_style=None, default_flow_style=None):
-        if default_flow_style is None:
-            default_flow_style = False
-        SafeRepresenter.__init__(self, default_style=default_style,
-                                 default_flow_style=default_flow_style)
-
-    def represent_none(self, data):
-        return self.represent_scalar(u'tag:yaml.org,2002:null',
-                                     u'')
-
-    def represent_preserved_scalarstring(self, data):
-        tag = None
-        style = '|'
-        if PY2 and not isinstance(data, unicode):
-            data = unicode(data, 'ascii')
-        tag = u'tag:yaml.org,2002:str'
-        return self.represent_scalar(tag, data, style=style)
-
-    def represent_single_quoted_scalarstring(self, data):
-        tag = None
-        style = "'"
-        if PY2 and not isinstance(data, unicode):
-            data = unicode(data, 'ascii')
-        tag = u'tag:yaml.org,2002:str'
-        return self.represent_scalar(tag, data, style=style)
-
-    def represent_double_quoted_scalarstring(self, data):
-        tag = None
-        style = '"'
-        if PY2 and not isinstance(data, unicode):
-            data = unicode(data, 'ascii')
-        tag = u'tag:yaml.org,2002:str'
-        return self.represent_scalar(tag, data, style=style)
-
-    def represent_sequence(self, tag, sequence, flow_style=None):
-        value = []
-        # if the flow_style is None, the flow style tacked on to the object
-        # explicitly will be taken. If that is None as well the default flow
-        # style rules
-        try:
-            flow_style = sequence.fa.flow_style(flow_style)
-        except AttributeError:
-            flow_style = flow_style
-        try:
-            anchor = sequence.yaml_anchor()
-        except AttributeError:
-            anchor = None
-        node = SequenceNode(tag, value, flow_style=flow_style, anchor=anchor)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        try:
-            comment = getattr(sequence, comment_attrib)
-            item_comments = comment.items
-            node.comment = comment.comment
-            try:
-                node.comment.append(comment.end)
-            except AttributeError:
-                pass
-        except AttributeError:
-            item_comments = {}
-        for idx, item in enumerate(sequence):
-            node_item = self.represent_data(item)
-            node_item.comment = item_comments.get(idx)
-            if not (isinstance(node_item, ScalarNode) and not node_item.style):
-                best_style = False
-            value.append(node_item)
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        return node
-
-    def represent_mapping(self, tag, mapping, flow_style=None):
-        value = []
-        try:
-            flow_style = mapping.fa.flow_style(flow_style)
-        except AttributeError:
-            flow_style = flow_style
-        try:
-            anchor = mapping.yaml_anchor()
-        except AttributeError:
-            anchor = None
-        node = MappingNode(tag, value, flow_style=flow_style, anchor=anchor)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        # no sorting! !!
-        try:
-            comment = getattr(mapping, comment_attrib)
-            node.comment = comment.comment
-            if node.comment and node.comment[1]:
-                for ct in node.comment[1]:
-                    ct.reset()
-            item_comments = comment.items
-            for v in item_comments.values():
-                if v and v[1]:
-                    for ct in v[1]:
-                        ct.reset()
-            try:
-                node.comment.append(comment.end)
-            except AttributeError:
-                pass
-        except AttributeError:
-            item_comments = {}
-        for item_key, item_value in mapping.items():
-            node_key = self.represent_key(item_key)
-            node_value = self.represent_data(item_value)
-            item_comment = item_comments.get(item_key)
-            if item_comment:
-                assert getattr(node_key, 'comment', None) is None
-                node_key.comment = item_comment[:2]
-                nvc = getattr(node_value, 'comment', None)
-                if nvc is not None:  # end comment already there
-                    nvc[0] = item_comment[2]
-                    nvc[1] = item_comment[3]
-                else:
-                    node_value.comment = item_comment[2:]
-            if not (isinstance(node_key, ScalarNode) and not node_key.style):
-                best_style = False
-            if not (isinstance(node_value, ScalarNode) and not
-                    node_value.style):
-                best_style = False
-            value.append((node_key, node_value))
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        merge_list = [m[1] for m in getattr(mapping, merge_attrib, [])]
-        if merge_list:
-            # because of the call to represent_data here, the anchors
-            # are marked as being used and thereby created
-            if len(merge_list) == 1:
-                arg = self.represent_data(merge_list[0])
-            else:
-                arg = self.represent_data(merge_list)
-                arg.flow_style = True
-            value.insert(0,
-                         (ScalarNode(u'tag:yaml.org,2002:merge', '<<'), arg))
-        return node
-
-    def represent_omap(self, tag, omap, flow_style=None):
-        value = []
-        try:
-            flow_style = omap.fa.flow_style(flow_style)
-        except AttributeError:
-            flow_style = flow_style
-        try:
-            anchor = omap.yaml_anchor()
-        except AttributeError:
-            anchor = None
-        node = SequenceNode(tag, value, flow_style=flow_style, anchor=anchor)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        try:
-            comment = getattr(omap, comment_attrib)
-            node.comment = comment.comment
-            if node.comment and node.comment[1]:
-                for ct in node.comment[1]:
-                    ct.reset()
-            item_comments = comment.items
-            for v in item_comments.values():
-                if v and v[1]:
-                    for ct in v[1]:
-                        ct.reset()
-            try:
-                node.comment.append(comment.end)
-            except AttributeError:
-                pass
-        except AttributeError:
-            item_comments = {}
-        for item_key in omap:
-            item_val = omap[item_key]
-            node_item = self.represent_data({item_key: item_val})
-            # node item has two scalars in value: node_key and node_value
-            item_comment = item_comments.get(item_key)
-            if item_comment:
-                if item_comment[1]:
-                    node_item.comment = [None, item_comment[1]]
-                assert getattr(node_item.value[0][0], 'comment', None) is None
-                node_item.value[0][0].comment = [item_comment[0], None]
-                nvc = getattr(node_item.value[0][1], 'comment', None)
-                if nvc is not None:  # end comment already there
-                    nvc[0] = item_comment[2]
-                    nvc[1] = item_comment[3]
-                else:
-                    node_item.value[0][1].comment = item_comment[2:]
-            # if not (isinstance(node_item, ScalarNode) \
-            #    and not node_item.style):
-            #     best_style = False
-            value.append(node_item)
-        if flow_style is None:
-            if self.default_flow_style is not None:
-                node.flow_style = self.default_flow_style
-            else:
-                node.flow_style = best_style
-        return node
-
-    def represent_set(self, setting):
-        flow_style = False
-        tag = u'tag:yaml.org,2002:set'
-        # return self.represent_mapping(tag, value)
-        value = []
-        flow_style = setting.fa.flow_style(flow_style)
-        try:
-            anchor = setting.yaml_anchor()
-        except AttributeError:
-            anchor = None
-        node = MappingNode(tag, value, flow_style=flow_style, anchor=anchor)
-        if self.alias_key is not None:
-            self.represented_objects[self.alias_key] = node
-        best_style = True
-        # no sorting! !!
-        try:
-            comment = getattr(setting, comment_attrib)
-            node.comment = comment.comment
-            if node.comment and node.comment[1]:
-                for ct in node.comment[1]:
-                    ct.reset()
-            item_comments = comment.items
-            for v in item_comments.values():
-                if v and v[1]:
-                    for ct in v[1]:
-                        ct.reset()
-            try:
-                node.comment.append(comment.end)
-            except AttributeError:
-                pass
-        except AttributeError:
-            item_comments = {}
-        for item_key in setting.odict:
-            node_key = self.represent_key(item_key)
-            node_value = self.represent_data(None)
-            item_comment = item_comments.get(item_key)
-            if item_comment:
-                assert getattr(node_key, 'comment', None) is None
-                node_key.comment = item_comment[:2]
-            node_key.style = node_value.style = "?"
-            if not (isinstance(node_key, ScalarNode) and not node_key.style):
-                best_style = False
-            if not (isinstance(node_value, ScalarNode) and not
-                    node_value.style):
-                best_style = False
-            value.append((node_key, node_value))
-        best_style = best_style
-        return node
-
-    def represent_dict(self, data):
-        """write out tag if saved on loading"""
-        try:
-            t = data.tag.value
-        except AttributeError:
-            t = None
-        if t:
-            while t and t[0] == '!':
-                t = t[1:]
-            tag = 'tag:yaml.org,2002:' + t
-        else:
-            tag = u'tag:yaml.org,2002:map'
-        return self.represent_mapping(tag, data)
-
-
-RoundTripRepresenter.add_representer(type(None),
-                                     RoundTripRepresenter.represent_none)
-
-RoundTripRepresenter.add_representer(
-    PreservedScalarString,
-    RoundTripRepresenter.represent_preserved_scalarstring)
-
-RoundTripRepresenter.add_representer(
-    SingleQuotedScalarString,
-    RoundTripRepresenter.represent_single_quoted_scalarstring)
-
-RoundTripRepresenter.add_representer(
-    DoubleQuotedScalarString,
-    RoundTripRepresenter.represent_double_quoted_scalarstring)
-
-RoundTripRepresenter.add_representer(CommentedSeq,
-                                     RoundTripRepresenter.represent_list)
-
-RoundTripRepresenter.add_representer(CommentedMap,
-                                     RoundTripRepresenter.represent_dict)
-
-RoundTripRepresenter.add_representer(CommentedOrderedMap,
-                                     RoundTripRepresenter.represent_ordereddict)
-
-if sys.version_info >= (2, 7):
-    import collections
-    RoundTripRepresenter.add_representer(collections.OrderedDict,
-                                         RoundTripRepresenter.represent_ordereddict)
-
-RoundTripRepresenter.add_representer(CommentedSet,
-                                     RoundTripRepresenter.represent_set)

lib/spack/external/ruamel/yaml/scalarstring.py

@@ -1,60 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-from __future__ import print_function
-
-__all__ = ["ScalarString", "PreservedScalarString", "SingleQuotedScalarString",
-           "DoubleQuotedScalarString"]
-
-try:
-    from .compat import text_type
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.compat import text_type
-
-
-class ScalarString(text_type):
-    def __new__(cls, *args, **kw):
-        return text_type.__new__(cls, *args, **kw)
-
-
-class PreservedScalarString(ScalarString):
-    def __new__(cls, value):
-        return ScalarString.__new__(cls, value)
-
-
-class SingleQuotedScalarString(ScalarString):
-    def __new__(cls, value):
-        return ScalarString.__new__(cls, value)
-
-
-class DoubleQuotedScalarString(ScalarString):
-    def __new__(cls, value):
-        return ScalarString.__new__(cls, value)
-
-
-def preserve_literal(s):
-    return PreservedScalarString(s.replace('\r\n', '\n').replace('\r', '\n'))
-
-
-def walk_tree(base):
-    """
-    the routine here walks over a simple yaml tree (recursing in
-    dict values and list items) and converts strings that
-    have multiple lines to literal scalars
-    """
-    from ruamel.yaml.compat import string_types
-
-    if isinstance(base, dict):
-        for k in base:
-            v = base[k]
-            if isinstance(v, string_types) and '\n' in v:
-                base[k] = preserve_literal(v)
-            else:
-                walk_tree(v)
-    elif isinstance(base, list):
-        for idx, elem in enumerate(base):
-            if isinstance(elem, string_types) and '\n' in elem:
-                print(elem)
-                base[idx] = preserve_literal(elem)
-            else:
-                walk_tree(elem)

lib/spack/external/ruamel/yaml/serializer.py

@@ -1,178 +0,0 @@
-# coding: utf-8
-
-from __future__ import absolute_import
-
-import re
-
-try:
-    from .error import YAMLError
-    from .compat import nprint, DBG_NODE, dbg, string_types
-except (ImportError, ValueError):  # for Jython
-    from ruamel.yaml.error import YAMLError
-    from ruamel.yaml.compat import nprint, DBG_NODE, dbg, string_types
-
-from ruamel.yaml.events import (
-    StreamStartEvent, StreamEndEvent, MappingStartEvent, MappingEndEvent,
-    SequenceStartEvent, SequenceEndEvent, AliasEvent, ScalarEvent,
-    DocumentStartEvent, DocumentEndEvent,
-)
-from ruamel.yaml.nodes import (
-    MappingNode, ScalarNode, SequenceNode,
-)
-
-__all__ = ['Serializer', 'SerializerError']
-
-
-class SerializerError(YAMLError):
-    pass
-
-
-class Serializer(object):
-
-    # 'id' and 3+ numbers, but not 000
-    ANCHOR_TEMPLATE = u'id%03d'
-    ANCHOR_RE = re.compile(u'id(?!000$)\\d{3,}')
-
-    def __init__(self, encoding=None, explicit_start=None, explicit_end=None,
-                 version=None, tags=None):
-        self.use_encoding = encoding
-        self.use_explicit_start = explicit_start
-        self.use_explicit_end = explicit_end
-        if isinstance(version, string_types):
-            self.use_version = tuple(map(int, version.split('.')))
-        else:
-            self.use_version = version
-        self.use_tags = tags
-        self.serialized_nodes = {}
-        self.anchors = {}
-        self.last_anchor_id = 0
-        self.closed = None
-        self._templated_id = None
-
-    def open(self):
-        if self.closed is None:
-            self.emit(StreamStartEvent(encoding=self.use_encoding))
-            self.closed = False
-        elif self.closed:
-            raise SerializerError("serializer is closed")
-        else:
-            raise SerializerError("serializer is already opened")
-
-    def close(self):
-        if self.closed is None:
-            raise SerializerError("serializer is not opened")
-        elif not self.closed:
-            self.emit(StreamEndEvent())
-            self.closed = True
-
-    # def __del__(self):
-    #     self.close()
-
-    def serialize(self, node):
-        if dbg(DBG_NODE):
-            nprint('Serializing nodes')
-            node.dump()
-        if self.closed is None:
-            raise SerializerError("serializer is not opened")
-        elif self.closed:
-            raise SerializerError("serializer is closed")
-        self.emit(DocumentStartEvent(explicit=self.use_explicit_start,
-                                     version=self.use_version,
-                                     tags=self.use_tags))
-        self.anchor_node(node)
-        self.serialize_node(node, None, None)
-        self.emit(DocumentEndEvent(explicit=self.use_explicit_end))
-        self.serialized_nodes = {}
-        self.anchors = {}
-        self.last_anchor_id = 0
-
-    def anchor_node(self, node):
-        if node in self.anchors:
-            if self.anchors[node] is None:
-                self.anchors[node] = self.generate_anchor(node)
-        else:
-            anchor = None
-            try:
-                if node.anchor.always_dump:
-                    anchor = node.anchor.value
-            except:
-                pass
-            self.anchors[node] = anchor
-            if isinstance(node, SequenceNode):
-                for item in node.value:
-                    self.anchor_node(item)
-            elif isinstance(node, MappingNode):
-                for key, value in node.value:
-                    self.anchor_node(key)
-                    self.anchor_node(value)
-
-    def generate_anchor(self, node):
-        try:
-            anchor = node.anchor.value
-        except:
-            anchor = None
-        if anchor is None:
-            self.last_anchor_id += 1
-            return self.ANCHOR_TEMPLATE % self.last_anchor_id
-        return anchor
-
-    def serialize_node(self, node, parent, index):
-        alias = self.anchors[node]
-        if node in self.serialized_nodes:
-            self.emit(AliasEvent(alias))
-        else:
-            self.serialized_nodes[node] = True
-            self.descend_resolver(parent, index)
-            if isinstance(node, ScalarNode):
-                # here check if the node.tag equals the one that would result from parsing
-                # if not equal quoting is necessary for strings
-                detected_tag = self.resolve(ScalarNode, node.value, (True, False))
-                default_tag = self.resolve(ScalarNode, node.value, (False, True))
-                implicit = (node.tag == detected_tag), (node.tag == default_tag)
-                self.emit(ScalarEvent(alias, node.tag, implicit, node.value,
-                                      style=node.style, comment=node.comment))
-            elif isinstance(node, SequenceNode):
-                implicit = (node.tag == self.resolve(SequenceNode, node.value, True))
-                comment = node.comment
-                # print('comment >>>>>>>>>>>>>.', comment, node.flow_style)
-                end_comment = None
-                seq_comment = None
-                if node.flow_style is True:
-                    if comment:  # eol comment on flow style sequence
-                        seq_comment = comment[0]
-                        # comment[0] = None
-                if comment and len(comment) > 2:
-                    end_comment = comment[2]
-                else:
-                    end_comment = None
-                self.emit(SequenceStartEvent(alias, node.tag, implicit,
-                                             flow_style=node.flow_style,
-                                             comment=node.comment))
-                index = 0
-                for item in node.value:
-                    self.serialize_node(item, node, index)
-                    index += 1
-                self.emit(SequenceEndEvent(comment=[seq_comment, end_comment]))
-            elif isinstance(node, MappingNode):
-                implicit = (node.tag == self.resolve(MappingNode, node.value, True))
-                comment = node.comment
-                end_comment = None
-                map_comment = None
-                if node.flow_style is True:
-                    if comment:  # eol comment on flow style sequence
-                        map_comment = comment[0]
-                        # comment[0] = None
-                if comment and len(comment) > 2:
-                    end_comment = comment[2]
-                self.emit(MappingStartEvent(alias, node.tag, implicit,
-                                            flow_style=node.flow_style,
-                                            comment=node.comment))
-                for key, value in node.value:
-                    self.serialize_node(key, node, None)
-                    self.serialize_node(value, node, key)
-                self.emit(MappingEndEvent(comment=[map_comment, end_comment]))
-            self.ascend_resolver()
-
-
-def templated_id(s):
-    return Serializer.ANCHOR_RE.match(s)

lib/spack/external/ruamel/yaml/setup.cfg

@@ -1,5 +0,0 @@
-[egg_info]
-tag_build = 
-tag_date = 0
-tag_svn_revision = 0
-

lib/spack/external/ruamel/yaml/tokens.py

@@ -1,195 +0,0 @@
-# # header
-# coding: utf-8
-
-
-class Token(object):
-    def __init__(self, start_mark, end_mark):
-        self.start_mark = start_mark
-        self.end_mark = end_mark
-
-    def __repr__(self):
-        attributes = [key for key in self.__dict__
-                      if not key.endswith('_mark')]
-        attributes.sort()
-        arguments = ', '.join(['%s=%r' % (key, getattr(self, key))
-                               for key in attributes])
-        return '%s(%s)' % (self.__class__.__name__, arguments)
-
-    def add_post_comment(self, comment):
-        if not hasattr(self, '_comment'):
-            self._comment = [None, None]
-        self._comment[0] = comment
-
-    def add_pre_comments(self, comments):
-        if not hasattr(self, '_comment'):
-            self._comment = [None, None]
-        assert self._comment[1] is None
-        self._comment[1] = comments
-
-    def get_comment(self):
-        return getattr(self, '_comment', None)
-
-    @property
-    def comment(self):
-        return getattr(self, '_comment', None)
-
-    def move_comment(self, target):
-        """move a comment from this token to target (normally next token)
-        used to combine e.g. comments before a BlockEntryToken to the
-        ScalarToken that follows it
-        """
-        c = self.comment
-        if c is None:
-            return
-        # don't push beyond last element
-        if isinstance(target, StreamEndToken):
-            return
-        delattr(self, '_comment')
-        tc = target.comment
-        if not tc:  # target comment, just insert
-            target._comment = c
-            return self
-        if c[0] and tc[0] or c[1] and tc[1]:
-            raise NotImplementedError('overlap in comment %r %r' % c, tc)
-        if c[0]:
-            tc[0] = c[0]
-        if c[1]:
-            tc[1] = c[1]
-        return self
-
-    def split_comment(self):
-        """ split the post part of a comment, and return it
-        as comment to be added. Delete second part if [None, None]
-         abc:  # this goes to sequence
-           # this goes to first element
-           - first element
-        """
-        comment = self.comment
-        if comment is None or comment[0] is None:
-            return None  # nothing to do
-        ret_val = [comment[0], None]
-        if comment[1] is None:
-            delattr(self, '_comment')
-        return ret_val
-
-
-# class BOMToken(Token):
-#     id = '<byte order mark>'
-
-class DirectiveToken(Token):
-    id = '<directive>'
-
-    def __init__(self, name, value, start_mark, end_mark):
-        Token.__init__(self, start_mark, end_mark)
-        self.name = name
-        self.value = value
-
-
-class DocumentStartToken(Token):
-    id = '<document start>'
-
-
-class DocumentEndToken(Token):
-    id = '<document end>'
-
-
-class StreamStartToken(Token):
-    id = '<stream start>'
-
-    def __init__(self, start_mark=None, end_mark=None, encoding=None):
-        Token.__init__(self, start_mark, end_mark)
-        self.encoding = encoding
-
-
-class StreamEndToken(Token):
-    id = '<stream end>'
-
-
-class BlockSequenceStartToken(Token):
-    id = '<block sequence start>'
-
-
-class BlockMappingStartToken(Token):
-    id = '<block mapping start>'
-
-
-class BlockEndToken(Token):
-    id = '<block end>'
-
-
-class FlowSequenceStartToken(Token):
-    id = '['
-
-
-class FlowMappingStartToken(Token):
-    id = '{'
-
-
-class FlowSequenceEndToken(Token):
-    id = ']'
-
-
-class FlowMappingEndToken(Token):
-    id = '}'
-
-
-class KeyToken(Token):
-    id = '?'
-
-
-class ValueToken(Token):
-    id = ':'
-
-
-class BlockEntryToken(Token):
-    id = '-'
-
-
-class FlowEntryToken(Token):
-    id = ','
-
-
-class AliasToken(Token):
-    id = '<alias>'
-
-    def __init__(self, value, start_mark, end_mark):
-        Token.__init__(self, start_mark, end_mark)
-        self.value = value
-
-
-class AnchorToken(Token):
-    id = '<anchor>'
-
-    def __init__(self, value, start_mark, end_mark):
-        Token.__init__(self, start_mark, end_mark)
-        self.value = value
-
-
-class TagToken(Token):
-    id = '<tag>'
-
-    def __init__(self, value, start_mark, end_mark):
-        Token.__init__(self, start_mark, end_mark)
-        self.value = value
-
-
-class ScalarToken(Token):
-    id = '<scalar>'
-
-    def __init__(self, value, plain, start_mark, end_mark, style=None):
-        Token.__init__(self, start_mark, end_mark)
-        self.value = value
-        self.plain = plain
-        self.style = style
-
-
-class CommentToken(Token):
-    id = '<comment>'
-
-    def __init__(self, value, start_mark, end_mark):
-        Token.__init__(self, start_mark, end_mark)
-        self.value = value
-
-    def reset(self):
-        if hasattr(self, 'pre_done'):
-            delattr(self, 'pre_done')

lib/spack/external/ruamel/yaml/util.py

@@ -1,139 +0,0 @@
-# coding: utf-8
-
-"""
-some helper functions that might be generally useful
-"""
-
-from __future__ import print_function
-from __future__ import absolute_import
-
-from .compat import text_type, binary_type
-from .main import round_trip_load
-
-
-# originally as comment
-# https://github.com/pre-commit/pre-commit/pull/211#issuecomment-186466605
-# if you use this in your code, I suggest adding a test in your test suite
-# that check this routines output against a known piece of your YAML
-# before upgrades to this code break your round-tripped YAML
-def load_yaml_guess_indent(stream, **kw):
-    """guess the indent and block sequence indent of yaml stream/string
-
-    returns round_trip_loaded stream, indent level, block sequence indent
-    - block sequence indent is the number of spaces before a dash relative to previous indent
-    - if there are no block sequences, indent is taken from nested mappings, block sequence
-      indent is unset (None) in that case
-    """
-    # load a yaml file guess the indentation, if you use TABs ...
-    def leading_spaces(l):
-        idx = 0
-        while idx < len(l) and l[idx] == ' ':
-            idx += 1
-        return idx
-
-    if isinstance(stream, text_type):
-        yaml_str = stream
-    elif isinstance(stream, binary_type):
-        yaml_str = stream.decode('utf-8')  # most likely, but the Reader checks BOM for this
-    else:
-        yaml_str = stream.read()
-    map_indent = None
-    indent = None  # default if not found for some reason
-    block_seq_indent = None
-    prev_line_key_only = None
-    key_indent = 0
-    for line in yaml_str.splitlines():
-        rline = line.rstrip()
-        lline = rline.lstrip()
-        if lline.startswith('- '):
-            l_s = leading_spaces(line)
-            block_seq_indent = l_s - key_indent
-            idx = l_s + 1
-            while line[idx] == ' ':  # this will end as we rstripped
-                idx += 1
-            if line[idx] == '#':     # comment after -
-                continue
-            indent = idx - key_indent
-            break
-        if map_indent is None and prev_line_key_only is not None and rline:
-            idx = 0
-            while line[idx] in ' -':
-                idx += 1
-            if idx > prev_line_key_only:
-                map_indent = idx - prev_line_key_only
-        if rline.endswith(':'):
-            key_indent = leading_spaces(line)
-            idx = 0
-            while line[idx] == ' ':  # this will end on ':'
-                idx += 1
-            prev_line_key_only = idx
-            continue
-        prev_line_key_only = None
-    if indent is None and map_indent is not None:
-        indent = map_indent
-    return round_trip_load(yaml_str, **kw), indent, block_seq_indent
-
-
-def configobj_walker(cfg):
-    """
-    walks over a ConfigObj (INI file with comments) generating
-    corresponding YAML output (including comments
-    """
-    from configobj import ConfigObj
-    assert isinstance(cfg, ConfigObj)
-    for c in cfg.initial_comment:
-        if c.strip():
-            yield c
-    for s in _walk_section(cfg):
-        if s.strip():
-            yield s
-    for c in cfg.final_comment:
-        if c.strip():
-            yield c
-
-
-def _walk_section(s, level=0):
-    from configobj import Section
-    assert isinstance(s, Section)
-    indent = u'  ' * level
-    for name in s.scalars:
-        for c in s.comments[name]:
-            yield indent + c.strip()
-        x = s[name]
-        if u'\n' in x:
-            i = indent + u'  '
-            x = u'|\n' + i + x.strip().replace(u'\n', u'\n' + i)
-        elif ':' in x:
-            x = u"'" + x.replace(u"'", u"''") + u"'"
-        line = u'{0}{1}: {2}'.format(indent, name, x)
-        c = s.inline_comments[name]
-        if c:
-            line += u' ' + c
-        yield line
-    for name in s.sections:
-        for c in s.comments[name]:
-            yield indent + c.strip()
-        line = u'{0}{1}:'.format(indent, name)
-        c = s.inline_comments[name]
-        if c:
-            line += u' ' + c
-        yield line
-        for val in _walk_section(s[name], level=level+1):
-            yield val
-
-# def config_obj_2_rt_yaml(cfg):
-#     from .comments import CommentedMap, CommentedSeq
-#     from configobj import ConfigObj
-#     assert isinstance(cfg, ConfigObj)
-#     #for c in cfg.initial_comment:
-#     #    if c.strip():
-#     #        pass
-#     cm = CommentedMap()
-#     for name in s.sections:
-#         cm[name] = d = CommentedMap()
-#
-#
-#     #for c in cfg.final_comment:
-#     #    if c.strip():
-#     #        yield c
-#     return cm

lib/spack/external/vendor.txt

@@ -7,3 +7,4 @@ jinja2==3.0.3
 six==1.16.0
 macholib==1.16.2
   altgraph==0.17.3
+ruamel.yaml==0.17.21

lib/spack/spack/binary_distribution.py

@@ -27,8 +27,6 @@
 from typing import List, NamedTuple, Optional, Union
 from urllib.error import HTTPError, URLError
 
-import ruamel.yaml as yaml
-
 import llnl.util.filesystem as fsys
 import llnl.util.lang
 import llnl.util.tty as tty
@@ -616,7 +614,7 @@ def read_buildinfo_file(prefix):
     filename = buildinfo_file_name(prefix)
     with open(filename, "r") as inputfile:
         content = inputfile.read()
-        buildinfo = yaml.load(content)
+        buildinfo = syaml.load(content)
     return buildinfo
 
 

lib/spack/spack/cmd/__init__.py

@@ -13,9 +13,6 @@
 from textwrap import dedent
 from typing import List, Match, Tuple
 
-import ruamel.yaml as yaml
-from ruamel.yaml.error import MarkedYAMLError
-
 import llnl.util.tty as tty
 from llnl.util.filesystem import join_path
 from llnl.util.lang import attr_setdefault, index_by
@@ -33,6 +30,7 @@
 import spack.traverse as traverse
 import spack.user_environment as uenv
 import spack.util.spack_json as sjson
+import spack.util.spack_yaml as syaml
 import spack.util.string
 
 # cmd has a submodule called "list" so preserve the python list module
@@ -537,9 +535,9 @@ def is_git_repo(path):
         # we might be in a git worktree
         try:
             with open(dotgit_path, "rb") as f:
-                dotgit_content = yaml.load(f)
+                dotgit_content = syaml.load(f)
             return os.path.isdir(dotgit_content.get("gitdir", dotgit_path))
-        except MarkedYAMLError:
+        except syaml.SpackYAMLError:
             pass
     return False
 

lib/spack/spack/config.py

@@ -38,10 +38,6 @@
 from contextlib import contextmanager
 from typing import Dict, List, Optional, Union
 
-import ruamel.yaml as yaml
-from ruamel.yaml.comments import Comment
-from ruamel.yaml.error import MarkedYAMLError
-
 import llnl.util.lang
 import llnl.util.tty as tty
 from llnl.util.filesystem import mkdirp, rename
@@ -163,8 +159,8 @@ def _write_section(self, section):
             mkdirp(self.path)
             with open(filename, "w") as f:
                 syaml.dump_config(data, stream=f, default_flow_style=False)
-        except (yaml.YAMLError, IOError) as e:
-            raise ConfigFileError("Error writing to config file: '%s'" % str(e))
+        except (syaml.SpackYAMLError, IOError) as e:
+            raise ConfigFileError(f"cannot write to '{filename}'") from e
 
     def clear(self):
         """Empty cached config information."""
@@ -293,8 +289,8 @@ def _write_section(self, section):
                 syaml.dump_config(data_to_write, stream=f, default_flow_style=False)
             rename(tmp, self.path)
 
-        except (yaml.YAMLError, IOError) as e:
-            raise ConfigFileError("Error writing to config file: '%s'" % str(e))
+        except (syaml.SpackYAMLError, IOError) as e:
+            raise ConfigFileError(f"cannot write to config file {str(e)}") from e
 
     def __repr__(self):
         return "<SingleFileScope: %s: %s>" % (self.name, self.path)
@@ -546,12 +542,12 @@ def update_config(
         # manually preserve comments
         need_comment_copy = section in scope.sections and scope.sections[section]
         if need_comment_copy:
-            comments = getattr(scope.sections[section][section], Comment.attrib, None)
+            comments = syaml.extract_comments(scope.sections[section][section])
 
         # read only the requested section's data.
         scope.sections[section] = syaml.syaml_dict({section: update_data})
         if need_comment_copy and comments:
-            setattr(scope.sections[section][section], Comment.attrib, comments)
+            syaml.set_comments(scope.sections[section][section], data_comments=comments)
 
         scope._write_section(section)
 
@@ -704,8 +700,8 @@ def print_section(self, section, blame=False):
             data = syaml.syaml_dict()
             data[section] = self.get_config(section)
             syaml.dump_config(data, stream=sys.stdout, default_flow_style=False, blame=blame)
-        except (yaml.YAMLError, IOError):
-            raise ConfigError("Error reading configuration: %s" % section)
+        except (syaml.SpackYAMLError, IOError) as e:
+            raise ConfigError(f"cannot read '{section}' configuration") from e
 
 
 @contextmanager
@@ -959,19 +955,9 @@ def validate(data, schema, filename=None):
     """
     import jsonschema
 
-    # validate a copy to avoid adding defaults
+    # Validate a copy to avoid adding defaults
     # This allows us to round-trip data without adding to it.
-    test_data = copy.deepcopy(data)
-
-    if isinstance(test_data, yaml.comments.CommentedMap):
-        # HACK to fully copy ruamel CommentedMap that doesn't provide copy
-        # method. Especially necessary for environments
-        setattr(
-            test_data,
-            yaml.comments.Comment.attrib,
-            getattr(data, yaml.comments.Comment.attrib, yaml.comments.Comment()),
-        )
-
+    test_data = syaml.deepcopy(data)
     try:
         spack.schema.Validator(schema).validate(test_data)
     except jsonschema.ValidationError as e:
@@ -1019,21 +1005,13 @@ def read_config_file(filename, schema=None):
         return data
 
     except StopIteration:
-        raise ConfigFileError("Config file is empty or is not a valid YAML dict: %s" % filename)
+        raise ConfigFileError(f"Config file is empty or is not a valid YAML dict: {filename}")
 
-    except MarkedYAMLError as e:
-        msg = "Error parsing yaml"
-        mark = e.context_mark if e.context_mark else e.problem_mark
-        if mark:
-            line, column = mark.line, mark.column
-            msg += ": near %s, %s, %s" % (mark.name, str(line), str(column))
-        else:
-            msg += ": %s" % (filename)
-        msg += ": %s" % (e.problem)
-        raise ConfigFileError(msg)
+    except syaml.SpackYAMLError as e:
+        raise ConfigFileError(str(e)) from e
 
     except IOError as e:
-        raise ConfigFileError("Error reading configuration file %s: %s" % (filename, str(e)))
+        raise ConfigFileError(f"Error reading configuration file {filename}: {str(e)}") from e
 
 
 def _override(string):
@@ -1089,8 +1067,8 @@ def _mark_internal(data, name):
         d = syaml.syaml_type(data)
 
     if syaml.markable(d):
-        d._start_mark = yaml.Mark(name, None, None, None, None, None)
-        d._end_mark = yaml.Mark(name, None, None, None, None, None)
+        d._start_mark = syaml.name_mark(name)
+        d._end_mark = syaml.name_mark(name)
 
     return d
 

lib/spack/spack/environment/environment.py

@@ -18,8 +18,6 @@
 import warnings
 from typing import Any, Dict, List, Optional, Union
 
-import ruamel.yaml as yaml
-
 import llnl.util.filesystem as fs
 import llnl.util.tty as tty
 import llnl.util.tty.color as clr
@@ -526,11 +524,6 @@ def __eq__(self, other):
     def to_dict(self):
         ret = syaml.syaml_dict([("root", self.raw_root)])
         if self.projections:
-            # projections guaranteed to be ordered dict if true-ish
-            # for python2.6, may be syaml or ruamel.yaml implementation
-            # so we have to check for both
-            types = (collections.OrderedDict, syaml.syaml_dict, yaml.comments.CommentedMap)
-            assert isinstance(self.projections, types)
             ret["projections"] = self.projections
         if self.select:
             ret["select"] = self.select

lib/spack/spack/mirror.py

@@ -19,8 +19,6 @@
 import traceback
 import urllib.parse
 
-import ruamel.yaml.error as yaml_error
-
 import llnl.util.tty as tty
 from llnl.util.filesystem import mkdirp
 
@@ -89,11 +87,8 @@ def to_yaml(self, stream=None):
 
     @staticmethod
     def from_yaml(stream, name=None):
-        try:
-            data = syaml.load(stream)
-            return Mirror.from_dict(data, name)
-        except yaml_error.MarkedYAMLError as e:
-            raise syaml.SpackYAMLError("error parsing YAML mirror:", str(e)) from e
+        data = syaml.load(stream)
+        return Mirror.from_dict(data, name)
 
     @staticmethod
     def from_json(stream, name=None):
@@ -288,11 +283,8 @@ def to_yaml(self, stream=None):
     # TODO: this isn't called anywhere
     @staticmethod
     def from_yaml(stream, name=None):
-        try:
-            data = syaml.load(stream)
-            return MirrorCollection(data)
-        except yaml_error.MarkedYAMLError as e:
-            raise syaml.SpackYAMLError("error parsing YAML mirror collection:", str(e)) from e
+        data = syaml.load(stream)
+        return MirrorCollection(data)
 
     @staticmethod
     def from_json(stream, name=None):

lib/spack/spack/repo.py

@@ -26,8 +26,6 @@
 import uuid
 from typing import Dict, Union
 
-import ruamel.yaml as yaml
-
 import llnl.util.filesystem as fs
 import llnl.util.lang
 import llnl.util.tty as tty
@@ -44,6 +42,7 @@
 import spack.util.git
 import spack.util.naming as nm
 import spack.util.path
+import spack.util.spack_yaml as syaml
 
 #: Package modules are imported as spack.pkg.<repo-namespace>.<pkg-name>
 ROOT_PYTHON_NAMESPACE = "spack.pkg"
@@ -1008,7 +1007,7 @@ def _read_config(self):
         """Check for a YAML config file in this db's root directory."""
         try:
             with open(self.config_file) as reponame_file:
-                yaml_data = yaml.load(reponame_file)
+                yaml_data = syaml.load(reponame_file)
 
                 if (
                     not yaml_data

lib/spack/spack/spec.py

@@ -57,8 +57,6 @@
 import warnings
 from typing import Tuple
 
-import ruamel.yaml as yaml
-
 import llnl.util.filesystem as fs
 import llnl.util.lang as lang
 import llnl.util.tty as tty
@@ -2305,11 +2303,8 @@ def from_yaml(stream):
         Args:
             stream: string or file object to read from.
         """
-        try:
-            data = yaml.load(stream)
-            return Spec.from_dict(data)
-        except yaml.error.MarkedYAMLError as e:
-            raise syaml.SpackYAMLError("error parsing YAML spec:", str(e)) from e
+        data = syaml.load(stream)
+        return Spec.from_dict(data)
 
     @staticmethod
     def from_json(stream):

lib/spack/spack/test/cmd/config.py

@@ -483,7 +483,7 @@ def test_config_add_to_env_preserve_comments(mutable_empty_config, mutable_mock_
 spack:  # comment
   # comment
   specs:  # comment
-    - foo  # comment
+  - foo  # comment
   # comment
   view: true  # comment
   packages:  # comment

lib/spack/spack/test/config.py

@@ -1414,5 +1414,5 @@ def test_config_file_read_invalid_yaml(tmpdir, mutable_empty_config):
     with open(filename, "w") as f:
         f.write("spack:\nview")
 
-    with pytest.raises(spack.config.ConfigFileError, match="parsing yaml"):
+    with pytest.raises(spack.config.ConfigFileError, match="parsing YAML"):
         spack.config.read_config_file(filename)

lib/spack/spack/test/env.py

@@ -385,3 +385,37 @@ def test_can_add_specs_to_environment_without_specs_attribute(tmp_path, mock_pac
 
     assert len(env.user_specs) == 1
     assert env.manifest.pristine_yaml_content["spack"]["specs"] == ["a"]
+
+
+@pytest.mark.parametrize(
+    "original_yaml,new_spec,expected_yaml",
+    [
+        (
+            """spack:
+  specs:
+  # baz
+  - zlib
+""",
+            "libpng",
+            """spack:
+  specs:
+  # baz
+  - zlib
+  - libpng
+""",
+        )
+    ],
+)
+def test_preserving_comments_when_adding_specs(
+    original_yaml, new_spec, expected_yaml, config, tmp_path
+):
+    """Ensure that round-tripping a spack.yaml file doesn't change its content."""
+    spack_yaml = tmp_path / "spack.yaml"
+    spack_yaml.write_text(original_yaml)
+
+    e = ev.Environment(str(tmp_path))
+    e.add(new_spec)
+    e.write()
+
+    content = spack_yaml.read_text()
+    assert content == expected_yaml

lib/spack/spack/test/mirror.py

@@ -145,11 +145,9 @@ def test_roundtrip_mirror(mirror):
     "invalid_yaml", ["playing_playlist: {{ action }} playlist {{ playlist_name }}"]
 )
 def test_invalid_yaml_mirror(invalid_yaml):
-    with pytest.raises(SpackYAMLError) as e:
+    with pytest.raises(SpackYAMLError, match="error parsing YAML") as e:
         spack.mirror.Mirror.from_yaml(invalid_yaml)
-    exc_msg = str(e.value)
-    assert exc_msg.startswith("error parsing YAML mirror:")
-    assert invalid_yaml in exc_msg
+    assert invalid_yaml in str(e.value)
 
 
 @pytest.mark.parametrize("invalid_json, error_message", [("{13:", "Expecting property name")])
@@ -184,11 +182,9 @@ def test_roundtrip_mirror_collection(mirror_collection):
     "invalid_yaml", ["playing_playlist: {{ action }} playlist {{ playlist_name }}"]
 )
 def test_invalid_yaml_mirror_collection(invalid_yaml):
-    with pytest.raises(SpackYAMLError) as e:
+    with pytest.raises(SpackYAMLError, match="error parsing YAML") as e:
         spack.mirror.MirrorCollection.from_yaml(invalid_yaml)
-    exc_msg = str(e.value)
-    assert exc_msg.startswith("error parsing YAML mirror collection:")
-    assert invalid_yaml in exc_msg
+    assert invalid_yaml in str(e.value)
 
 
 @pytest.mark.parametrize("invalid_json, error_message", [("{13:", "Expecting property name")])

lib/spack/spack/test/spack_yaml.py

@@ -4,6 +4,8 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 """Test Spack's custom YAML format."""
+import io
+import sys
 
 import pytest
 
@@ -88,7 +90,53 @@ def test_yaml_aliases():
         "e": aliased_list_2,
         "f": aliased_list_2,
     }
-    string = syaml.dump(dict_with_aliases)
+    stringio = io.StringIO()
+    syaml.dump(dict_with_aliases, stream=stringio)
 
     # ensure no YAML aliases appear in syaml dumps.
-    assert "*id" not in string
+    assert "*id" not in stringio.getvalue()
+
+
+@pytest.mark.parametrize(
+    "initial_content,expected_final_content",
+    [
+        # List are dumped indented as the outer attribute
+        (
+            """spack:
+  #foo
+  specs:
+  # bar
+  - zlib
+""",
+            None,
+        ),
+        (
+            """spack:
+  #foo
+  specs:
+    # bar
+    - zlib
+""",
+            """spack:
+  #foo
+  specs:
+    # bar
+  - zlib
+""",
+        ),
+    ],
+)
+@pytest.mark.xfail(sys.platform == "win32", reason="fails on Windows")
+def test_round_trip_configuration(initial_content, expected_final_content, tmp_path):
+    """Test that configuration can be loaded and dumped without too many changes"""
+    file = tmp_path / "test.yaml"
+    file.write_text(initial_content)
+    final_content = io.StringIO()
+
+    data = syaml.load_config(file)
+    syaml.dump_config(data, stream=final_content)
+
+    if expected_final_content is None:
+        expected_final_content = initial_content
+
+    assert final_content.getvalue() == expected_final_content

lib/spack/spack/test/spec_yaml.py

@@ -81,11 +81,9 @@ def test_normal_spec(mock_packages):
     "invalid_yaml", ["playing_playlist: {{ action }} playlist {{ playlist_name }}"]
 )
 def test_invalid_yaml_spec(invalid_yaml):
-    with pytest.raises(SpackYAMLError) as e:
+    with pytest.raises(SpackYAMLError, match="error parsing YAML") as e:
         Spec.from_yaml(invalid_yaml)
-    exc_msg = str(e.value)
-    assert exc_msg.startswith("error parsing YAML spec:")
-    assert invalid_yaml in exc_msg
+    assert invalid_yaml in str(e)
 
 
 @pytest.mark.parametrize("invalid_json, error_message", [("{13:", "Expecting property name")])

lib/spack/spack/test/util/spack_yaml.py

@@ -92,5 +92,5 @@ def get_file_lines(filename):
                 val = val.lower()
 
             lines = get_file_lines(filename)
-            assert key in lines[line]
+            assert key in lines[line], filename
             assert val in lines[line]

lib/spack/spack/util/spack_yaml.py

@@ -14,13 +14,16 @@
 """
 import collections
 import collections.abc
+import copy
 import ctypes
+import enum
+import functools
 import io
 import re
-from typing import List
+from typing import IO, List, Optional
 
-import ruamel.yaml as yaml
-from ruamel.yaml import RoundTripDumper, RoundTripLoader
+import ruamel.yaml
+from ruamel.yaml import comments, constructor, emitter, error, representer
 
 from llnl.util.tty.color import cextra, clen, colorize
 
@@ -34,7 +37,7 @@
 # Also, use OrderedDict instead of just dict.
 class syaml_dict(collections.OrderedDict):
     def __repr__(self):
-        mappings = ("%r: %r" % (k, v) for k, v in self.items())
+        mappings = (f"{k!r}: {v!r}" for k, v in self.items())
         return "{%s}" % ", ".join(mappings)
 
 
@@ -54,7 +57,7 @@ class syaml_int(int):
 syaml_types = {syaml_str: str, syaml_int: int, syaml_dict: dict, syaml_list: list}
 
 
-markable_types = set(syaml_types) | set([yaml.comments.CommentedSeq, yaml.comments.CommentedMap])
+markable_types = set(syaml_types) | {comments.CommentedSeq, comments.CommentedMap}
 
 
 def syaml_type(obj):
@@ -96,7 +99,7 @@ def marked(obj):
     )
 
 
-class OrderedLineLoader(RoundTripLoader):
+class OrderedLineConstructor(constructor.RoundTripConstructor):
     """YAML loader specifically intended for reading Spack configuration
     files. It preserves order and line numbers. It also has special-purpose
     logic for handling dictionary keys that indicate a Spack config
@@ -120,7 +123,7 @@ class OrderedLineLoader(RoundTripLoader):
     #
 
     def construct_yaml_str(self, node):
-        value = super(OrderedLineLoader, self).construct_yaml_str(node)
+        value = super().construct_yaml_str(node)
         # There is no specific marker to indicate that we are parsing a key,
         # so this assumes we are talking about a Spack config override key if
         # it ends with a ':' and does not contain a '@' (which can appear
@@ -134,7 +137,7 @@ def construct_yaml_str(self, node):
         return value
 
     def construct_yaml_seq(self, node):
-        gen = super(OrderedLineLoader, self).construct_yaml_seq(node)
+        gen = super().construct_yaml_seq(node)
         data = next(gen)
         if markable(data):
             mark(data, node)
@@ -143,7 +146,7 @@ def construct_yaml_seq(self, node):
             pass
 
     def construct_yaml_map(self, node):
-        gen = super(OrderedLineLoader, self).construct_yaml_map(node)
+        gen = super().construct_yaml_map(node)
         data = next(gen)
         if markable(data):
             mark(data, node)
@@ -153,19 +156,24 @@ def construct_yaml_map(self, node):
 
 
 # register above new constructors
-OrderedLineLoader.add_constructor("tag:yaml.org,2002:map", OrderedLineLoader.construct_yaml_map)
-OrderedLineLoader.add_constructor("tag:yaml.org,2002:seq", OrderedLineLoader.construct_yaml_seq)
-OrderedLineLoader.add_constructor("tag:yaml.org,2002:str", OrderedLineLoader.construct_yaml_str)
+OrderedLineConstructor.add_constructor(
+    "tag:yaml.org,2002:map", OrderedLineConstructor.construct_yaml_map
+)
+OrderedLineConstructor.add_constructor(
+    "tag:yaml.org,2002:seq", OrderedLineConstructor.construct_yaml_seq
+)
+OrderedLineConstructor.add_constructor(
+    "tag:yaml.org,2002:str", OrderedLineConstructor.construct_yaml_str
+)
 
 
-class OrderedLineDumper(RoundTripDumper):
-    """Dumper that preserves ordering and formats ``syaml_*`` objects.
+class OrderedLineRepresenter(representer.RoundTripRepresenter):
+    """Representer that preserves ordering and formats ``syaml_*`` objects.
 
-    This dumper preserves insertion ordering ``syaml_dict`` objects
+    This representer preserves insertion ordering ``syaml_dict`` objects
     when they're written out.  It also has some custom formatters
     for ``syaml_*`` objects so that they are formatted like their
     regular Python equivalents, instead of ugly YAML pyobjects.
-
     """
 
     def ignore_aliases(self, _data):
@@ -173,7 +181,7 @@ def ignore_aliases(self, _data):
         return True
 
     def represent_data(self, data):
-        result = super(OrderedLineDumper, self).represent_data(data)
+        result = super().represent_data(data)
         if data is None:
             result.value = syaml_str("null")
         return result
@@ -181,31 +189,53 @@ def represent_data(self, data):
     def represent_str(self, data):
         if hasattr(data, "override") and data.override:
             data = data + ":"
-        return super(OrderedLineDumper, self).represent_str(data)
+        return super().represent_str(data)
 
 
-class SafeDumper(RoundTripDumper):
+class SafeRepresenter(representer.RoundTripRepresenter):
     def ignore_aliases(self, _data):
         """Make the dumper NEVER print YAML aliases."""
         return True
 
 
 # Make our special objects look like normal YAML ones.
-RoundTripDumper.add_representer(syaml_dict, RoundTripDumper.represent_dict)
-RoundTripDumper.add_representer(syaml_list, RoundTripDumper.represent_list)
-RoundTripDumper.add_representer(syaml_int, RoundTripDumper.represent_int)
-RoundTripDumper.add_representer(syaml_str, RoundTripDumper.represent_str)
-OrderedLineDumper.add_representer(syaml_str, OrderedLineDumper.represent_str)
+representer.RoundTripRepresenter.add_representer(
+    syaml_dict, representer.RoundTripRepresenter.represent_dict
+)
+representer.RoundTripRepresenter.add_representer(
+    syaml_list, representer.RoundTripRepresenter.represent_list
+)
+representer.RoundTripRepresenter.add_representer(
+    syaml_int, representer.RoundTripRepresenter.represent_int
+)
+representer.RoundTripRepresenter.add_representer(
+    syaml_str, representer.RoundTripRepresenter.represent_str
+)
+OrderedLineRepresenter.add_representer(syaml_str, OrderedLineRepresenter.represent_str)
 
 
 #: Max integer helps avoid passing too large a value to cyaml.
 maxint = 2 ** (ctypes.sizeof(ctypes.c_int) * 8 - 1) - 1
 
 
-def dump(obj, default_flow_style=False, stream=None):
-    return yaml.dump(
-        obj, default_flow_style=default_flow_style, width=maxint, Dumper=SafeDumper, stream=stream
-    )
+def return_string_when_no_stream(func):
+    @functools.wraps(func)
+    def wrapper(data, stream=None, **kwargs):
+        if stream:
+            return func(data, stream=stream, **kwargs)
+        stream = io.StringIO()
+        func(data, stream=stream, **kwargs)
+        return stream.getvalue()
+
+    return wrapper
+
+
+@return_string_when_no_stream
+def dump(data, stream=None, default_flow_style=False):
+    handler = ConfigYAML(yaml_type=YAMLType.GENERIC_YAML)
+    handler.default_flow_style = default_flow_style
+    handler.width = maxint
+    return handler.dump(data, stream=stream)
 
 
 def file_line(mark):
@@ -220,11 +250,11 @@ def file_line(mark):
 #: This is nasty but YAML doesn't give us many ways to pass arguments --
 #: yaml.dump() takes a class (not an instance) and instantiates the dumper
 #: itself, so we can't just pass an instance
-_annotations: List[str] = []
+_ANNOTATIONS: List[str] = []
 
 
-class LineAnnotationDumper(OrderedLineDumper):
-    """Dumper that generates per-line annotations.
+class LineAnnotationRepresenter(OrderedLineRepresenter):
+    """Representer that generates per-line annotations.
 
     Annotations are stored in the ``_annotations`` global.  After one
     dump pass, the strings in ``_annotations`` will correspond one-to-one
@@ -240,22 +270,9 @@ class LineAnnotationDumper(OrderedLineDumper):
     annotations.
     """
 
-    saved = None
-
-    def __init__(self, *args, **kwargs):
-        super(LineAnnotationDumper, self).__init__(*args, **kwargs)
-        del _annotations[:]
-        self.colors = "KgrbmcyGRBMCY"
-        self.filename_colors = {}
-
-    def process_scalar(self):
-        super(LineAnnotationDumper, self).process_scalar()
-        if marked(self.event.value):
-            self.saved = self.event.value
-
     def represent_data(self, data):
         """Force syaml_str to be passed through with marks."""
-        result = super(LineAnnotationDumper, self).represent_data(data)
+        result = super().represent_data(data)
         if data is None:
             result.value = syaml_str("null")
         elif isinstance(result.value, str):
@@ -264,10 +281,25 @@ def represent_data(self, data):
             mark(result.value, data)
         return result
 
+
+class LineAnnotationEmitter(emitter.Emitter):
+    saved = None
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        del _ANNOTATIONS[:]
+        self.colors = "KgrbmcyGRBMCY"
+        self.filename_colors = {}
+
+    def process_scalar(self):
+        super().process_scalar()
+        if marked(self.event.value):
+            self.saved = self.event.value
+
     def write_line_break(self):
-        super(LineAnnotationDumper, self).write_line_break()
+        super().write_line_break()
         if self.saved is None:
-            _annotations.append(colorize("@K{---}"))
+            _ANNOTATIONS.append(colorize("@K{---}"))
             return
 
         # append annotations at the end of each line
@@ -284,37 +316,131 @@ def write_line_break(self):
             ann = fmt % mark.name
             if mark.line is not None:
                 ann += ":@c{%s}" % (mark.line + 1)
-            _annotations.append(colorize(ann))
+            _ANNOTATIONS.append(colorize(ann))
         else:
-            _annotations.append("")
+            _ANNOTATIONS.append("")
+
+    def write_comment(self, comment, pre=False):
+        pass
 
 
-def load_config(*args, **kwargs):
+class YAMLType(enum.Enum):
+    """YAML configurations handled by Spack"""
+
+    #: Generic YAML configuration
+    GENERIC_YAML = enum.auto()
+    #: A Spack config file with overrides
+    SPACK_CONFIG_FILE = enum.auto()
+    #: A Spack config file with line annotations
+    ANNOTATED_SPACK_CONFIG_FILE = enum.auto()
+
+
+class ConfigYAML:
+    """Handles the loading and dumping of Spack's YAML files."""
+
+    def __init__(self, yaml_type: YAMLType) -> None:
+        self.yaml = ruamel.yaml.YAML(typ="rt", pure=True)
+        if yaml_type == YAMLType.GENERIC_YAML:
+            self.yaml.Representer = SafeRepresenter
+        elif yaml_type == YAMLType.ANNOTATED_SPACK_CONFIG_FILE:
+            self.yaml.Representer = LineAnnotationRepresenter
+            self.yaml.Emitter = LineAnnotationEmitter
+            self.yaml.Constructor = OrderedLineConstructor
+        else:
+            self.yaml.Representer = OrderedLineRepresenter
+            self.yaml.Constructor = OrderedLineConstructor
+
+    def load(self, stream: IO):
+        """Loads the YAML data from a stream and returns it.
+
+        Args:
+            stream: stream to load from.
+
+        Raises:
+            SpackYAMLError: if anything goes wrong while loading
+        """
+        try:
+            return self.yaml.load(stream)
+
+        except error.MarkedYAMLError as e:
+            msg = "error parsing YAML"
+            error_mark = e.context_mark if e.context_mark else e.problem_mark
+            if error_mark:
+                line, column = error_mark.line, error_mark.column
+                msg += f": near {error_mark.name}, {str(line)}, {str(column)}"
+            else:
+                msg += f": {stream.name}"
+            msg += f": {e.problem}"
+            raise SpackYAMLError(msg, e) from e
+
+        except Exception as e:
+            msg = "cannot load Spack YAML configuration"
+            raise SpackYAMLError(msg, e) from e
+
+    def dump(self, data, stream: Optional[IO] = None, *, transform=None) -> None:
+        """Dumps the YAML data to a stream.
+
+        Args:
+            data: data to be dumped
+            stream: stream to dump the data into.
+
+        Raises:
+            SpackYAMLError: if anything goes wrong while dumping
+        """
+        try:
+            return self.yaml.dump(data, stream=stream, transform=transform)
+        except Exception as e:
+            msg = "cannot dump Spack YAML configuration"
+            raise SpackYAMLError(msg, str(e)) from e
+
+    def as_string(self, data) -> str:
+        """Returns a string representing the YAML data passed as input."""
+        result = io.StringIO()
+        self.dump(data, stream=result)
+        return result.getvalue()
+
+
+def deepcopy(data):
+    """Returns a deepcopy of the input YAML data."""
+    result = copy.deepcopy(data)
+
+    if isinstance(result, comments.CommentedMap):
+        # HACK to fully copy ruamel CommentedMap that doesn't provide copy
+        # method. Especially necessary for environments
+        extracted_comments = extract_comments(data)
+        if extracted_comments:
+            set_comments(result, data_comments=extracted_comments)
+
+    return result
+
+
+def load_config(str_or_file):
     """Load but modify the loader instance so that it will add __line__
     attributes to the returned object."""
-    kwargs["Loader"] = OrderedLineLoader
-    return yaml.load(*args, **kwargs)
+    handler = ConfigYAML(yaml_type=YAMLType.SPACK_CONFIG_FILE)
+    return handler.load(str_or_file)
 
 
 def load(*args, **kwargs):
-    return yaml.load(*args, **kwargs)
+    handler = ConfigYAML(yaml_type=YAMLType.GENERIC_YAML)
+    return handler.load(*args, **kwargs)
 
 
-def dump_config(*args, **kwargs):
-    blame = kwargs.pop("blame", False)
-
+@return_string_when_no_stream
+def dump_config(data, stream, *, default_flow_style=False, blame=False):
     if blame:
-        return dump_annotated(*args, **kwargs)
-    else:
-        kwargs["Dumper"] = OrderedLineDumper
-        return yaml.dump(*args, **kwargs)
+        handler = ConfigYAML(yaml_type=YAMLType.ANNOTATED_SPACK_CONFIG_FILE)
+        handler.yaml.default_flow_style = default_flow_style
+        return _dump_annotated(handler, data, stream)
+
+    handler = ConfigYAML(yaml_type=YAMLType.SPACK_CONFIG_FILE)
+    handler.yaml.default_flow_style = default_flow_style
+    return handler.dump(data, stream)
 
 
-def dump_annotated(data, stream=None, *args, **kwargs):
-    kwargs["Dumper"] = LineAnnotationDumper
-
+def _dump_annotated(handler, data, stream=None):
     sio = io.StringIO()
-    yaml.dump(data, sio, *args, **kwargs)
+    handler.dump(data, sio)
 
     # write_line_break() is not called by YAML for empty lines, so we
     # skip empty lines here with \n+.
@@ -326,10 +452,10 @@ def dump_annotated(data, stream=None, *args, **kwargs):
         getvalue = stream.getvalue
 
     # write out annotations and lines, accounting for color
-    width = max(clen(a) for a in _annotations)
-    formats = ["%%-%ds  %%s\n" % (width + cextra(a)) for a in _annotations]
+    width = max(clen(a) for a in _ANNOTATIONS)
+    formats = ["%%-%ds  %%s\n" % (width + cextra(a)) for a in _ANNOTATIONS]
 
-    for f, a, l in zip(formats, _annotations, lines):
+    for f, a, l in zip(formats, _ANNOTATIONS, lines):
         stream.write(f % (a, l))
 
     if getvalue:
@@ -352,8 +478,23 @@ def sorted_dict(dict_like):
     return result
 
 
+def extract_comments(data):
+    """Extract and returns comments from some YAML data"""
+    return getattr(data, comments.Comment.attrib, None)
+
+
+def set_comments(data, *, data_comments):
+    """Set comments on some YAML data"""
+    return setattr(data, comments.Comment.attrib, data_comments)
+
+
+def name_mark(name):
+    """Returns a mark with just a name"""
+    return error.StringMark(name, None, None, None, None, None)
+
+
 class SpackYAMLError(spack.error.SpackError):
     """Raised when there are issues with YAML parsing."""
 
     def __init__(self, msg, yaml_error):
-        super(SpackYAMLError, self).__init__(msg, str(yaml_error))
+        super().__init__(msg, str(yaml_error))

pyproject.toml

@@ -222,6 +222,9 @@ drop = [
   '^pygments/lexers/(?!python|__init__|_mapping).*\.py$',
   # trim rich's markdown support
   "rich/markdown.py",
+  # ruamel.yaml installs unneded files
+  "ruamel.*.pth",
+  "pvectorc.*.so"
 ]
 
 [tool.vendoring.typing-stubs]