diff options
| -rw-r--r-- | lib/spack/external/spack_astunparse/unparser.py | 126 |
1 files changed, 63 insertions, 63 deletions
diff --git a/lib/spack/external/spack_astunparse/unparser.py b/lib/spack/external/spack_astunparse/unparser.py index 854af9a534..d3b57684d9 100644 --- a/lib/spack/external/spack_astunparse/unparser.py +++ b/lib/spack/external/spack_astunparse/unparser.py @@ -1,12 +1,22 @@ "Usage: unparse.py <path to source file>" from __future__ import print_function, unicode_literals -import six -import sys + import ast import os +import sys import tokenize + +from contextlib import contextmanager + +import six from six import StringIO + +# TODO: if we require Python 3.7, use its `nullcontext()` +def nullcontext(): + yield + + # Large float and imaginary literals get turned into infinities in the AST. # We unparse those infinities to INFSTR. INFSTR = "1e" + repr(sys.float_info.max_10_exp + 1) @@ -74,14 +84,22 @@ class Unparser: "Append a piece of text to the current line." self.f.write(six.text_type(text)) - def enter(self): - "Print ':', and increase the indentation." - self.write(":") - self._indent += 1 + class _Block: + """A context manager for preparing the source for blocks. It adds + the character ':', increases the indentation on enter and decreases + the indentation on exit.""" + def __init__(self, unparser): + self.unparser = unparser + + def __enter__(self): + self.unparser.write(":") + self.unparser._indent += 1 - def leave(self): - "Decrease the indentation level." - self._indent -= 1 + def __exit__(self, exc_type, exc_value, traceback): + self.unparser._indent -= 1 + + def block(self): + return self._Block(self) def dispatch(self, tree): "Dispatcher function, dispatching tree type T to method _T." @@ -279,35 +297,30 @@ class Unparser: def _Try(self, t): self.fill("try") - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) for ex in t.handlers: self.dispatch(ex) if t.orelse: self.fill("else") - self.enter() - self.dispatch(t.orelse) - self.leave() + with self.block(): + self.dispatch(t.orelse) if t.finalbody: self.fill("finally") - self.enter() - self.dispatch(t.finalbody) - self.leave() + with self.block(): + self.dispatch(t.finalbody) def _TryExcept(self, t): self.fill("try") - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) for ex in t.handlers: self.dispatch(ex) if t.orelse: self.fill("else") - self.enter() - self.dispatch(t.orelse) - self.leave() + with self.block(): + self.dispatch(t.orelse) def _TryFinally(self, t): if len(t.body) == 1 and isinstance(t.body[0], ast.TryExcept): @@ -315,14 +328,12 @@ class Unparser: self.dispatch(t.body) else: self.fill("try") - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) self.fill("finally") - self.enter() - self.dispatch(t.finalbody) - self.leave() + with self.block(): + self.dispatch(t.finalbody) def _ExceptHandler(self, t): self.fill("except") @@ -335,9 +346,8 @@ class Unparser: self.write(t.name) else: self.dispatch(t.name) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) def _ClassDef(self, t): self.write("\n") @@ -375,9 +385,8 @@ class Unparser: self.write(", ") self.dispatch(t.bases[-1]) self.write(")") - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) def _FunctionDef(self, t): self.__FunctionDef_helper(t, "def") @@ -397,9 +406,8 @@ class Unparser: if getattr(t, "returns", False): self.write(" -> ") self.dispatch(t.returns) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) def _For(self, t): self.__For_helper("for ", t) @@ -412,48 +420,41 @@ class Unparser: self.dispatch(t.target) self.write(" in ") self.dispatch(t.iter) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) if t.orelse: self.fill("else") - self.enter() - self.dispatch(t.orelse) - self.leave() + with self.block(): + self.dispatch(t.orelse) def _If(self, t): self.fill("if ") self.dispatch(t.test) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) # collapse nested ifs into equivalent elifs. while (t.orelse and len(t.orelse) == 1 and isinstance(t.orelse[0], ast.If)): t = t.orelse[0] self.fill("elif ") self.dispatch(t.test) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) # final else if t.orelse: self.fill("else") - self.enter() - self.dispatch(t.orelse) - self.leave() + with self.block(): + self.dispatch(t.orelse) def _While(self, t): self.fill("while ") self.dispatch(t.test) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) if t.orelse: self.fill("else") - self.enter() - self.dispatch(t.orelse) - self.leave() + with self.block(): + self.dispatch(t.orelse) def _generic_With(self, t, async_=False): self.fill("async with " if async_ else "with ") @@ -464,9 +465,8 @@ class Unparser: if t.optional_vars: self.write(" as ") self.dispatch(t.optional_vars) - self.enter() - self.dispatch(t.body) - self.leave() + with self.block(): + self.dispatch(t.body) def _With(self, t): self._generic_With(t) |