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bpo-30349: Raise FutureWarning for nested sets and set operations (#1553)

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in regular expressions.
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Serhiy Storchaka 2017-11-16 12:38:26 +02:00 • committed by GitHub
parent 3daaafb700
commit 05cb728d68
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8 changed files with 106 additions and 9 deletions
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24
Lib/sre_parse.py
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@ -517,6 +517,12 @@ def _parse(source, state, verbose, nested, first=False):
setappend = set.append
## if sourcematch(":"):
## pass # handle character classes
if source.next == '[':
import warnings
warnings.warn(
'Possible nested set at position %d' % source.tell(),
FutureWarning, stacklevel=nested + 6
)
negate = sourcematch("^")
# check remaining characters
while True:
@ -529,6 +535,17 @@ def _parse(source, state, verbose, nested, first=False):
elif this[0] == "\\":
code1 = _class_escape(source, this)
else:
if set and this in '-&~|' and source.next == this:
import warnings
warnings.warn(
'Possible set %s at position %d' % (
'difference' if this == '-' else
'intersection' if this == '&' else
'symmetric difference' if this == '~' else
'union',
source.tell() - 1),
FutureWarning, stacklevel=nested + 6
)
code1 = LITERAL, _ord(this)
if sourcematch("-"):
# potential range
@ -545,6 +562,13 @@ def _parse(source, state, verbose, nested, first=False):
if that[0] == "\\":
code2 = _class_escape(source, that)
else:
if that == '-':
import warnings
warnings.warn(
'Possible set difference at position %d' % (
source.tell() - 2),
FutureWarning, stacklevel=nested + 6
)
code2 = LITERAL, _ord(that)
if code1[0] != LITERAL or code2[0] != LITERAL:
msg = "bad character range %s-%s" % (this, that)