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Issue #23622: Unknown escapes in regular expressions that consist of `'\'`

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and ASCII letter now raise a deprecation warning and will be forbidden in
Python 3.6.
This commit is contained in:
Serhiy Storchaka 2015-03-24 22:58:14 +02:00
parent 793c14ea29
commit a54aae0683
6 changed files with 60 additions and 19 deletions
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14
Lib/sre_parse.py
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@ -21,6 +21,7 @@ DIGITS = frozenset("0123456789")
OCTDIGITS = frozenset("01234567")
HEXDIGITS = frozenset("0123456789abcdefABCDEF")
ASCIILETTERS = frozenset("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
WHITESPACE = frozenset(" \t\n\r\v\f")
@ -344,6 +345,10 @@ def _class_escape(source, escape):
elif c in DIGITS:
raise ValueError
if len(escape) == 2:
if c in ASCIILETTERS:
import warnings
warnings.warn('bad escape %s' % escape,
DeprecationWarning, stacklevel=8)
return LITERAL, ord(escape[1])
except ValueError:
pass
@ -407,6 +412,10 @@ def _escape(source, escape, state):
return GROUPREF, group
raise ValueError
if len(escape) == 2:
if c in ASCIILETTERS:
import warnings
warnings.warn('bad escape %s' % escape,
DeprecationWarning, stacklevel=8)
return LITERAL, ord(escape[1])
except ValueError:
pass
@ -903,7 +912,10 @@ def parse_template(source, pattern):
try:
this = chr(ESCAPES[this][1])
except KeyError:
pass
if c in ASCIILETTERS:
import warnings
warnings.warn('bad escape %s' % this,
DeprecationWarning, stacklevel=5)
lappend(this)
else:
lappend(this)