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-rw-r--r--lib/spack/external/spack_astunparse/unparser.py126
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)