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Merged revisions 66364 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r66364 | guido.van.rossum | 2008-09-10 07:27:00 -0700 (Wed, 10 Sep 2008) | 3 lines

  Issue #3629: Fix sre "bytecode" validator for an end case.
  Reviewed by Amaury.
........
This commit is contained in:
Guido van Rossum 2008-09-10 14:30:50 +00:00
parent 93cbca33f2
commit 92f8f3e013
2 changed files with 8 additions and 3 deletions
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4
Lib/test/test_re.py
View File

@ -91,6 +91,10 @@ class ReTests(unittest.TestCase):
self.assertRaises(ValueError, re.findall, pattern, 'A', re.I)
self.assertRaises(ValueError, re.compile, pattern, re.I)
def test_bug_3629(self):
# A regex that triggered a bug in the sre-code validator
re.compile("(?P<quote>)(?(quote))")
def test_sub_template_numeric_escape(self):
# bug 776311 and friends
self.assertEqual(re.sub('x', r'\0', 'x'), '\0')

7
Modules/_sre.c
View File

@ -2780,17 +2780,18 @@ _compile(PyObject* self_, PyObject* args)
arg = *code++; \
VTRACE(("%lu (arg)\n", (unsigned long)arg)); \
} while (0)
#define GET_SKIP \
#define GET_SKIP_ADJ(adj) \
do { \
VTRACE(("%p= ", code)); \
if (code >= end) FAIL; \
skip = *code; \
VTRACE(("%lu (skip to %p)\n", \
(unsigned long)skip, code+skip)); \
if (code+skip < code || code+skip > end) \
if (code+skip-adj < code || code+skip-adj > end)\
FAIL; \
code++; \
} while (0)
#define GET_SKIP GET_SKIP_ADJ(0)
static int
_validate_charset(SRE_CODE *code, SRE_CODE *end)
@ -3097,7 +3098,7 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
GET_ARG;
if (arg >= groups)
FAIL;
GET_SKIP;
GET_SKIP_ADJ(1);
code--; /* The skip is relative to the first arg! */
/* There are two possibilities here: if there is both a 'then'
part and an 'else' part, the generated code looks like: