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Fix bug in 3x list comprehensions with ifnot

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rocky
2016-05-28 12:12:38 -04:00
parent eebe8249a8
commit a984ae4f6a
4 changed files with 20 additions and 25 deletions
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BIN
test/bytecode_3.5/10-list-ifnot.pyc
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5
test/simple_source/comprehension/06_list_ifnot.py Normal file
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@@ -0,0 +1,5 @@
# Test semantic handling of
# [x for x in names2 if not y]
# Bug seen in Python 3
names2 = []
names = [x for x in names2 if not len(x)]

17
test/simple_source/comprehension/10-list-ifnot.py
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@@ -1,17 +0,0 @@
# Test semantic handling of
# [x for x in names if not y]
import os
def bug(dirname, pattern):
if not dirname:
if isinstance(pattern, bytes):
dirname = bytes(os.curdir, 'ASCII')
else:
dirname = os.curdir
try:
names = os.listdir(dirname)
except os.error:
return []
if not _ishidden(pattern):
names = [x for x in names if not _ishidden(x)]
return fnmatch.filter(names, pattern)

23
uncompyle6/semantics/pysource.py
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@@ -975,7 +975,7 @@ class SourceWalker(GenericASTTraversal, object):
self.prec = 27
n = node[-1]
assert n == 'list_iter'
# find innerst node
# find innermost node
while n == 'list_iter':
n = n[0] # recurse one step
if n == 'list_for': n = n[3]
@@ -1059,31 +1059,38 @@ class SourceWalker(GenericASTTraversal, object):
self.customize(code._customize)
ast = ast[0][0][0][0][0]
try:
n = ast[iter_index]
except:
from trepan.api import debug; debug()
n = ast[iter_index]
assert n == 'list_iter'
## FIXME: I'm not totally sure this is right.
# find innermost node
designator = None
list_if_node = None
while n == 'list_iter':
n = n[0] # recurse one step
if n == 'list_for':
designator = n[2]
if n[2] == 'designator':
designator = n[2]
n = n[3]
elif n in ['list_if', 'list_if_not']:
# FIXME: just a guess
designator = n[1]
list_if_node = n[0]
if n[1] == 'designator':
designator = n[1]
n = n[2]
pass
pass
assert n == 'lc_body', ast
assert designator, "Couldn't find designator in list comprehension"
self.preorder(n[0])
self.write(' for ')
self.preorder(designator)
self.write(' in ')
self.preorder(node[-3])
if list_if_node:
self.write(' if ')
self.preorder(list_if_node)
self.prec = p
def listcomprehension_walk2(self, node):