unparser: add block() context manager for indentation
This is a backport of a refactor from cpython 3.9
This commit is contained in:
Todd Gamblin
Greg Becker
parent
2badd6500e
commit
5847eb1e65
1 changed files with 63 additions and 63 deletions
126
lib/spack/external/spack_astunparse/unparser.py
vendored
126
lib/spack/external/spack_astunparse/unparser.py
vendored
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@ -1,12 +1,22 @@
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"Usage: unparse.py <path to source file>"
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from __future__ import print_function, unicode_literals
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import six
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import sys
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import ast
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import os
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import sys
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import tokenize
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from contextlib import contextmanager
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import six
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from six import StringIO
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# TODO: if we require Python 3.7, use its `nullcontext()`
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def nullcontext():
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yield
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# Large float and imaginary literals get turned into infinities in the AST.
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# We unparse those infinities to INFSTR.
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INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1)
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@ -74,14 +84,22 @@ def write(self, text):
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"Append a piece of text to the current line."
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self.f.write(six.text_type(text))
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def enter(self):
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"Print ':', and increase the indentation."
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self.write(":")
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self._indent += 1
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class _Block:
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"""A context manager for preparing the source for blocks. It adds
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the character ':', increases the indentation on enter and decreases
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the indentation on exit."""
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def __init__(self, unparser):
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self.unparser = unparser
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def leave(self):
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"Decrease the indentation level."
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self._indent -= 1
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def __enter__(self):
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self.unparser.write(":")
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self.unparser._indent += 1
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def __exit__(self, exc_type, exc_value, traceback):
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self.unparser._indent -= 1
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def block(self):
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return self._Block(self)
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def dispatch(self, tree):
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"Dispatcher function, dispatching tree type T to method _T."
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@ -279,35 +297,30 @@ def _Raise(self, t):
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def _Try(self, t):
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self.fill("try")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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for ex in t.handlers:
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self.dispatch(ex)
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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with self.block():
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self.dispatch(t.orelse)
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if t.finalbody:
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self.fill("finally")
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self.enter()
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self.dispatch(t.finalbody)
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self.leave()
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with self.block():
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self.dispatch(t.finalbody)
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def _TryExcept(self, t):
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self.fill("try")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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for ex in t.handlers:
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self.dispatch(ex)
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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with self.block():
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self.dispatch(t.orelse)
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def _TryFinally(self, t):
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if len(t.body) == 1 and isinstance(t.body[0], ast.TryExcept):
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@ -315,14 +328,12 @@ def _TryFinally(self, t):
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self.dispatch(t.body)
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else:
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self.fill("try")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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self.fill("finally")
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self.enter()
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self.dispatch(t.finalbody)
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self.leave()
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with self.block():
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self.dispatch(t.finalbody)
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def _ExceptHandler(self, t):
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self.fill("except")
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@ -335,9 +346,8 @@ def _ExceptHandler(self, t):
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self.write(t.name)
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else:
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self.dispatch(t.name)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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def _ClassDef(self, t):
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self.write("\n")
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@ -375,9 +385,8 @@ def _ClassDef(self, t):
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self.write(", ")
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self.dispatch(t.bases[-1])
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self.write(")")
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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def _FunctionDef(self, t):
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self.__FunctionDef_helper(t, "def")
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@ -397,9 +406,8 @@ def __FunctionDef_helper(self, t, fill_suffix):
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if getattr(t, "returns", False):
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self.write(" -> ")
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self.dispatch(t.returns)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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def _For(self, t):
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self.__For_helper("for ", t)
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@ -412,48 +420,41 @@ def __For_helper(self, fill, t):
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self.dispatch(t.target)
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self.write(" in ")
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self.dispatch(t.iter)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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with self.block():
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self.dispatch(t.orelse)
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def _If(self, t):
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self.fill("if ")
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self.dispatch(t.test)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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# collapse nested ifs into equivalent elifs.
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while (t.orelse and len(t.orelse) == 1 and
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isinstance(t.orelse[0], ast.If)):
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t = t.orelse[0]
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self.fill("elif ")
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self.dispatch(t.test)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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# final else
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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with self.block():
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self.dispatch(t.orelse)
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def _While(self, t):
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self.fill("while ")
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self.dispatch(t.test)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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if t.orelse:
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self.fill("else")
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self.enter()
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self.dispatch(t.orelse)
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self.leave()
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with self.block():
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self.dispatch(t.orelse)
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def _generic_With(self, t, async_=False):
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self.fill("async with " if async_ else "with ")
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@ -464,9 +465,8 @@ def _generic_With(self, t, async_=False):
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if t.optional_vars:
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self.write(" as ")
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self.dispatch(t.optional_vars)
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self.enter()
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self.dispatch(t.body)
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self.leave()
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with self.block():
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self.dispatch(t.body)
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def _With(self, t):
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self._generic_With(t)
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