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bpo-31690: Allow the inline flags "a", "L", and "u" to be used as group flags for RE. (#3885)

This commit is contained in:
Serhiy Storchaka 2017-10-24 23:31:42 +03:00 committed by GitHub
parent fdd9b217c6
commit 3557b05c5a
11 changed files with 300 additions and 140 deletions
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58
Doc/library/re.rst
View File

@ -245,16 +245,32 @@ The special characters are:
*cannot* be retrieved after performing a match or referenced later in the
pattern.
``(?imsx-imsx:...)``
(Zero or more letters from the set ``'i'``, ``'m'``, ``'s'``, ``'x'``,
optionally followed by ``'-'`` followed by one or more letters from the
same set.) The letters set or removes the corresponding flags:
:const:`re.I` (ignore case), :const:`re.M` (multi-line), :const:`re.S`
(dot matches all), and :const:`re.X` (verbose), for the part of the
expression. (The flags are described in :ref:`contents-of-module-re`.)
``(?aiLmsux-imsx:...)``
(Zero or more letters from the set ``'a'``, ``'i'``, ``'L'``, ``'m'``,
``'s'``, ``'u'``, ``'x'``, optionally followed by ``'-'`` followed by
one or more letters from the ``'i'``, ``'m'``, ``'s'``, ``'x'``.)
The letters set or remove the corresponding flags:
:const:`re.A` (ASCII-only matching), :const:`re.I` (ignore case),
:const:`re.L` (locale dependent), :const:`re.M` (multi-line),
:const:`re.S` (dot matches all), :const:`re.U` (Unicode matching),
and :const:`re.X` (verbose), for the part of the expression.
(The flags are described in :ref:`contents-of-module-re`.)
The letters ``'a'``, ``'L'`` and ``'u'`` are mutually exclusive when used
as inline flags, so they can't be combined or follow ``'-'``. Instead,
when one of them appears in an inline group, it overrides the matching mode
in the enclosing group. In Unicode patterns ``(?a:...)`` switches to
ASCII-only matching, and ``(?u:...)`` switches to Unicode matching
(default). In byte pattern ``(?L:...)`` switches to locale depending
matching, and ``(?a:...)`` switches to ASCII-only matching (default).
This override is only in effect for the narrow inline group, and the
original matching mode is restored outside of the group.
.. versionadded:: 3.6
.. versionchanged:: 3.7
The letters ``'a'``, ``'L'`` and ``'u'`` also can be used in a group.
``(?P<name>...)``
Similar to regular parentheses, but the substring matched by the group is
accessible via the symbolic group name *name*. Group names must be valid
@ -384,9 +400,7 @@ character ``'$'``.
Matches any Unicode decimal digit (that is, any character in
Unicode character category [Nd]). This includes ``[0-9]``, and
also many other digit characters. If the :const:`ASCII` flag is
used only ``[0-9]`` is matched (but the flag affects the entire
regular expression, so in such cases using an explicit ``[0-9]``
may be a better choice).
used only ``[0-9]`` is matched.
For 8-bit (bytes) patterns:
Matches any decimal digit; this is equivalent to ``[0-9]``.
@ -394,9 +408,7 @@ character ``'$'``.
``\D``
Matches any character which is not a decimal digit. This is
the opposite of ``\d``. If the :const:`ASCII` flag is used this
becomes the equivalent of ``[^0-9]`` (but the flag affects the entire
regular expression, so in such cases using an explicit ``[^0-9]`` may
be a better choice).
becomes the equivalent of ``[^0-9]``.
``\s``
For Unicode (str) patterns:
@ -404,9 +416,7 @@ character ``'$'``.
``[ \t\n\r\f\v]``, and also many other characters, for example the
non-breaking spaces mandated by typography rules in many
languages). If the :const:`ASCII` flag is used, only
``[ \t\n\r\f\v]`` is matched (but the flag affects the entire
regular expression, so in such cases using an explicit
``[ \t\n\r\f\v]`` may be a better choice).
``[ \t\n\r\f\v]`` is matched.
For 8-bit (bytes) patterns:
Matches characters considered whitespace in the ASCII character set;
@ -415,18 +425,14 @@ character ``'$'``.
``\S``
Matches any character which is not a whitespace character. This is
the opposite of ``\s``. If the :const:`ASCII` flag is used this
becomes the equivalent of ``[^ \t\n\r\f\v]`` (but the flag affects the entire
regular expression, so in such cases using an explicit ``[^ \t\n\r\f\v]`` may
be a better choice).
becomes the equivalent of ``[^ \t\n\r\f\v]``.
``\w``
For Unicode (str) patterns:
Matches Unicode word characters; this includes most characters
that can be part of a word in any language, as well as numbers and
the underscore. If the :const:`ASCII` flag is used, only
``[a-zA-Z0-9_]`` is matched (but the flag affects the entire
regular expression, so in such cases using an explicit
``[a-zA-Z0-9_]`` may be a better choice).
``[a-zA-Z0-9_]`` is matched.
For 8-bit (bytes) patterns:
Matches characters considered alphanumeric in the ASCII character set;
@ -437,9 +443,7 @@ character ``'$'``.
``\W``
Matches any character which is not a word character. This is
the opposite of ``\w``. If the :const:`ASCII` flag is used this
becomes the equivalent of ``[^a-zA-Z0-9_]`` (but the flag affects the
entire regular expression, so in such cases using an explicit
``[^a-zA-Z0-9_]`` may be a better choice). If the :const:`LOCALE` flag is
becomes the equivalent of ``[^a-zA-Z0-9_]``. If the :const:`LOCALE` flag is
used, matches characters considered alphanumeric in the current locale
and the underscore.
@ -563,9 +567,7 @@ form.
letter I with dot above), 'ı' (U+0131, Latin small letter dotless i),
'ſ' (U+017F, Latin small letter long s) and 'K' (U+212A, Kelvin sign).
If the :const:`ASCII` flag is used, only letters 'a' to 'z'
and 'A' to 'Z' are matched (but the flag affects the entire regular
expression, so in such cases using an explicit ``(?-i:[a-zA-Z])`` may be
a better choice).
and 'A' to 'Z' are matched.
.. data:: L
LOCALE

7
Doc/whatsnew/3.7.rst
View File

@ -296,6 +296,13 @@ pdb
argument. If given, this is printed to the console just before debugging
begins.
re
--
The flags :const:`re.ASCII`, :const:`re.LOCALE` and :const:`re.UNICODE`
can be set within the scope of a group.
(Contributed by Serhiy Storchaka in :issue:`31690`.)
string
------

59
Lib/sre_compile.py
View File

@ -62,6 +62,12 @@ _equivalences = (
_ignorecase_fixes = {i: tuple(j for j in t if i != j)
for t in _equivalences for i in t}
def _combine_flags(flags, add_flags, del_flags,
TYPE_FLAGS=sre_parse.TYPE_FLAGS):
if add_flags & TYPE_FLAGS:
flags &= ~TYPE_FLAGS
return (flags | add_flags) & ~del_flags
def _compile(code, pattern, flags):
# internal: compile a (sub)pattern
emit = code.append
@ -87,15 +93,21 @@ def _compile(code, pattern, flags):
emit(op)
emit(av)
elif flags & SRE_FLAG_LOCALE:
emit(OP_LOC_IGNORE[op])
emit(OP_LOCALE_IGNORE[op])
emit(av)
elif not iscased(av):
emit(op)
emit(av)
else:
lo = tolower(av)
if fixes and lo in fixes:
emit(IN_IGNORE)
if not fixes: # ascii
emit(OP_IGNORE[op])
emit(lo)
elif lo not in fixes:
emit(OP_UNICODE_IGNORE[op])
emit(lo)
else:
emit(IN_UNI_IGNORE)
skip = _len(code); emit(0)
if op is NOT_LITERAL:
emit(NEGATE)
@ -104,17 +116,16 @@ def _compile(code, pattern, flags):
emit(k)
emit(FAILURE)
code[skip] = _len(code) - skip
else:
emit(OP_IGNORE[op])
emit(lo)
elif op is IN:
charset, hascased = _optimize_charset(av, iscased, tolower, fixes)
if flags & SRE_FLAG_IGNORECASE and flags & SRE_FLAG_LOCALE:
emit(IN_LOC_IGNORE)
elif hascased:
elif not hascased:
emit(IN)
elif not fixes: # ascii
emit(IN_IGNORE)
else:
emit(IN)
emit(IN_UNI_IGNORE)
skip = _len(code); emit(0)
_compile_charset(charset, flags, code)
code[skip] = _len(code) - skip
@ -153,8 +164,8 @@ def _compile(code, pattern, flags):
if group:
emit(MARK)
emit((group-1)*2)
# _compile_info(code, p, (flags | add_flags) & ~del_flags)
_compile(code, p, (flags | add_flags) & ~del_flags)
# _compile_info(code, p, _combine_flags(flags, add_flags, del_flags))
_compile(code, p, _combine_flags(flags, add_flags, del_flags))
if group:
emit(MARK)
emit((group-1)*2+1)
@ -210,10 +221,14 @@ def _compile(code, pattern, flags):
av = CH_UNICODE[av]
emit(av)
elif op is GROUPREF:
if flags & SRE_FLAG_IGNORECASE:
emit(OP_IGNORE[op])
else:
if not flags & SRE_FLAG_IGNORECASE:
emit(op)
elif flags & SRE_FLAG_LOCALE:
emit(GROUPREF_LOC_IGNORE)
elif not fixes: # ascii
emit(GROUPREF_IGNORE)
else:
emit(GROUPREF_UNI_IGNORE)
emit(av-1)
elif op is GROUPREF_EXISTS:
emit(op)
@ -240,7 +255,7 @@ def _compile_charset(charset, flags, code):
pass
elif op is LITERAL:
emit(av)
elif op is RANGE or op is RANGE_IGNORE:
elif op is RANGE or op is RANGE_UNI_IGNORE:
emit(av[0])
emit(av[1])
elif op is CHARSET:
@ -309,9 +324,9 @@ def _optimize_charset(charset, iscased=None, fixup=None, fixes=None):
hascased = True
# There are only two ranges of cased non-BMP characters:
# 10400-1044F (Deseret) and 118A0-118DF (Warang Citi),
# and for both ranges RANGE_IGNORE works.
# and for both ranges RANGE_UNI_IGNORE works.
if op is RANGE:
op = RANGE_IGNORE
op = RANGE_UNI_IGNORE
tail.append((op, av))
break
@ -456,7 +471,7 @@ def _get_literal_prefix(pattern, flags):
prefixappend(av)
elif op is SUBPATTERN:
group, add_flags, del_flags, p = av
flags1 = (flags | add_flags) & ~del_flags
flags1 = _combine_flags(flags, add_flags, del_flags)
if flags1 & SRE_FLAG_IGNORECASE and flags1 & SRE_FLAG_LOCALE:
break
prefix1, prefix_skip1, got_all = _get_literal_prefix(p, flags1)
@ -482,7 +497,7 @@ def _get_charset_prefix(pattern, flags):
if op is not SUBPATTERN:
break
group, add_flags, del_flags, pattern = av
flags = (flags | add_flags) & ~del_flags
flags = _combine_flags(flags, add_flags, del_flags)
if flags & SRE_FLAG_IGNORECASE and flags & SRE_FLAG_LOCALE:
return None
@ -631,6 +646,7 @@ def dis(code):
print_(op)
elif op in (LITERAL, NOT_LITERAL,
LITERAL_IGNORE, NOT_LITERAL_IGNORE,
LITERAL_UNI_IGNORE, NOT_LITERAL_UNI_IGNORE,
LITERAL_LOC_IGNORE, NOT_LITERAL_LOC_IGNORE):
arg = code[i]
i += 1
@ -647,12 +663,12 @@ def dis(code):
arg = str(CHCODES[arg])
assert arg[:9] == 'CATEGORY_'
print_(op, arg[9:])
elif op in (IN, IN_IGNORE, IN_LOC_IGNORE):
elif op in (IN, IN_IGNORE, IN_UNI_IGNORE, IN_LOC_IGNORE):
skip = code[i]
print_(op, skip, to=i+skip)
dis_(i+1, i+skip)
i += skip
elif op in (RANGE, RANGE_IGNORE):
elif op in (RANGE, RANGE_UNI_IGNORE):
lo, hi = code[i: i+2]
i += 2
print_(op, '%#02x %#02x (%r-%r)' % (lo, hi, chr(lo), chr(hi)))
@ -671,7 +687,8 @@ def dis(code):
print_2(_hex_code(code[i: i + 256//_CODEBITS]))
i += 256//_CODEBITS
level -= 1
elif op in (MARK, GROUPREF, GROUPREF_IGNORE):
elif op in (MARK, GROUPREF, GROUPREF_IGNORE, GROUPREF_UNI_IGNORE,
GROUPREF_LOC_IGNORE):
arg = code[i]
i += 1
print_(op, arg)

40
Lib/sre_constants.py
View File

@ -13,7 +13,7 @@
# update when constants are added or removed
MAGIC = 20170530
MAGIC = 20171005
from _sre import MAXREPEAT, MAXGROUPS
@ -84,25 +84,37 @@ OPCODES = _makecodes("""
CALL
CATEGORY
CHARSET BIGCHARSET
GROUPREF GROUPREF_EXISTS GROUPREF_IGNORE
IN IN_IGNORE
GROUPREF GROUPREF_EXISTS
IN
INFO
JUMP
LITERAL LITERAL_IGNORE
LITERAL
MARK
MAX_UNTIL
MIN_UNTIL
NOT_LITERAL NOT_LITERAL_IGNORE
NOT_LITERAL
NEGATE
RANGE
REPEAT
REPEAT_ONE
SUBPATTERN
MIN_REPEAT_ONE
RANGE_IGNORE
GROUPREF_IGNORE
IN_IGNORE
LITERAL_IGNORE
NOT_LITERAL_IGNORE
GROUPREF_LOC_IGNORE
IN_LOC_IGNORE
LITERAL_LOC_IGNORE
NOT_LITERAL_LOC_IGNORE
IN_LOC_IGNORE
GROUPREF_UNI_IGNORE
IN_UNI_IGNORE
LITERAL_UNI_IGNORE
NOT_LITERAL_UNI_IGNORE
RANGE_UNI_IGNORE
MIN_REPEAT MAX_REPEAT
""")
@ -113,7 +125,9 @@ ATCODES = _makecodes("""
AT_BEGINNING AT_BEGINNING_LINE AT_BEGINNING_STRING
AT_BOUNDARY AT_NON_BOUNDARY
AT_END AT_END_LINE AT_END_STRING
AT_LOC_BOUNDARY AT_LOC_NON_BOUNDARY
AT_UNI_BOUNDARY AT_UNI_NON_BOUNDARY
""")
@ -123,7 +137,9 @@ CHCODES = _makecodes("""
CATEGORY_SPACE CATEGORY_NOT_SPACE
CATEGORY_WORD CATEGORY_NOT_WORD
CATEGORY_LINEBREAK CATEGORY_NOT_LINEBREAK
CATEGORY_LOC_WORD CATEGORY_LOC_NOT_WORD
CATEGORY_UNI_DIGIT CATEGORY_UNI_NOT_DIGIT
CATEGORY_UNI_SPACE CATEGORY_UNI_NOT_SPACE
CATEGORY_UNI_WORD CATEGORY_UNI_NOT_WORD
@ -133,18 +149,20 @@ CHCODES = _makecodes("""
# replacement operations for "ignore case" mode
OP_IGNORE = {
GROUPREF: GROUPREF_IGNORE,
IN: IN_IGNORE,
LITERAL: LITERAL_IGNORE,
NOT_LITERAL: NOT_LITERAL_IGNORE,
RANGE: RANGE_IGNORE,
}
OP_LOC_IGNORE = {
OP_LOCALE_IGNORE = {
LITERAL: LITERAL_LOC_IGNORE,
NOT_LITERAL: NOT_LITERAL_LOC_IGNORE,
}
OP_UNICODE_IGNORE = {
LITERAL: LITERAL_UNI_IGNORE,
NOT_LITERAL: NOT_LITERAL_UNI_IGNORE,
}
AT_MULTILINE = {
AT_BEGINNING: AT_BEGINNING_LINE,
AT_END: AT_END_LINE

24
Lib/sre_parse.py
View File

@ -65,8 +65,8 @@ FLAGS = {
"u": SRE_FLAG_UNICODE,
}
GLOBAL_FLAGS = (SRE_FLAG_ASCII | SRE_FLAG_LOCALE | SRE_FLAG_UNICODE |
SRE_FLAG_DEBUG | SRE_FLAG_TEMPLATE)
TYPE_FLAGS = SRE_FLAG_ASCII | SRE_FLAG_LOCALE | SRE_FLAG_UNICODE
GLOBAL_FLAGS = SRE_FLAG_DEBUG | SRE_FLAG_TEMPLATE
class Verbose(Exception):
pass
@ -822,7 +822,19 @@ def _parse_flags(source, state, char):
del_flags = 0
if char != "-":
while True:
add_flags |= FLAGS[char]
flag = FLAGS[char]
if source.istext:
if char == 'L':
msg = "bad inline flags: cannot use 'L' flag with a str pattern"
raise source.error(msg)
else:
if char == 'u':
msg = "bad inline flags: cannot use 'u' flag with a bytes pattern"
raise source.error(msg)
add_flags |= flag
if (flag & TYPE_FLAGS) and (add_flags & TYPE_FLAGS) != flag:
msg = "bad inline flags: flags 'a', 'u' and 'L' are incompatible"
raise source.error(msg)
char = sourceget()
if char is None:
raise source.error("missing -, : or )")
@ -844,7 +856,11 @@ def _parse_flags(source, state, char):
msg = "unknown flag" if char.isalpha() else "missing flag"
raise source.error(msg, len(char))
while True:
del_flags |= FLAGS[char]
flag = FLAGS[char]
if flag & TYPE_FLAGS:
msg = "bad inline flags: cannot turn off flags 'a', 'u' and 'L'"
raise source.error(msg)
del_flags |= flag
char = sourceget()
if char is None:
raise source.error("missing :")

22
Lib/test/test_re.py
View File

@ -1470,11 +1470,11 @@ class ReTests(unittest.TestCase):
self.assertIsNone(pat.match(b'\xe0'))
# Incompatibilities
self.assertRaises(ValueError, re.compile, br'\w', re.UNICODE)
self.assertRaises(ValueError, re.compile, br'(?u)\w')
self.assertRaises(re.error, re.compile, br'(?u)\w')
self.assertRaises(ValueError, re.compile, r'\w', re.UNICODE | re.ASCII)
self.assertRaises(ValueError, re.compile, r'(?u)\w', re.ASCII)
self.assertRaises(ValueError, re.compile, r'(?a)\w', re.UNICODE)
self.assertRaises(ValueError, re.compile, r'(?au)\w')
self.assertRaises(re.error, re.compile, r'(?au)\w')
def test_locale_flag(self):
import locale
@ -1516,11 +1516,11 @@ class ReTests(unittest.TestCase):
self.assertIsNone(pat.match(bletter))
# Incompatibilities
self.assertRaises(ValueError, re.compile, '', re.LOCALE)
self.assertRaises(ValueError, re.compile, '(?L)')
self.assertRaises(re.error, re.compile, '(?L)')
self.assertRaises(ValueError, re.compile, b'', re.LOCALE | re.ASCII)
self.assertRaises(ValueError, re.compile, b'(?L)', re.ASCII)
self.assertRaises(ValueError, re.compile, b'(?a)', re.LOCALE)
self.assertRaises(ValueError, re.compile, b'(?aL)')
self.assertRaises(re.error, re.compile, b'(?aL)')
def test_scoped_flags(self):
self.assertTrue(re.match(r'(?i:a)b', 'Ab'))
@ -1535,12 +1535,18 @@ class ReTests(unittest.TestCase):
self.assertTrue(re.match(r'(?-x: a) b', ' ab', re.VERBOSE))
self.assertIsNone(re.match(r'(?-x: a) b', 'ab', re.VERBOSE))
self.checkPatternError(r'(?a:\w)',
'bad inline flags: cannot turn on global flag', 3)
self.assertTrue(re.match(r'\w(?a:\W)\w', '\xe0\xe0\xe0'))
self.assertTrue(re.match(r'(?a:\W(?u:\w)\W)', '\xe0\xe0\xe0'))
self.assertTrue(re.match(r'\W(?u:\w)\W', '\xe0\xe0\xe0', re.ASCII))
self.checkPatternError(r'(?a)(?-a:\w)',
'bad inline flags: cannot turn off global flag', 8)
"bad inline flags: cannot turn off flags 'a', 'u' and 'L'", 8)
self.checkPatternError(r'(?i-i:a)',
'bad inline flags: flag turned on and off', 5)
'bad inline flags: flag turned on and off', 5)
self.checkPatternError(r'(?au:a)',
"bad inline flags: flags 'a', 'u' and 'L' are incompatible", 4)
self.checkPatternError(br'(?aL:a)',
"bad inline flags: flags 'a', 'u' and 'L' are incompatible", 4)
self.checkPatternError(r'(?-', 'missing flag', 3)
self.checkPatternError(r'(?-+', 'missing flag', 3)

2
Misc/NEWS.d/next/Library/2017-10-05-15-14-46.bpo-31690.f0XteV.rst Normal file
View File

@ -0,0 +1,2 @@
Allow the flags re.ASCII, re.LOCALE, and re.UNICODE to be used as group flags
for regular expressions.

37
Modules/_sre.c
View File

@ -97,12 +97,12 @@ static const char copyright[] =
#define SRE_IS_WORD(ch)\
((ch) < 128 && (Py_ISALNUM(ch) || (ch) == '_'))
static unsigned int sre_lower(unsigned int ch)
static unsigned int sre_lower_ascii(unsigned int ch)
{
return ((ch) < 128 ? Py_TOLOWER(ch) : ch);
}
static unsigned int sre_upper(unsigned int ch)
static unsigned int sre_upper_ascii(unsigned int ch)
{
return ((ch) < 128 ? Py_TOUPPER(ch) : ch);
}
@ -188,6 +188,15 @@ sre_category(SRE_CODE category, unsigned int ch)
return 0;
}
LOCAL(int)
char_loc_ignore(SRE_CODE pattern, SRE_CODE ch)
{
return ch == pattern
|| (SRE_CODE) sre_lower_locale(ch) == pattern
|| (SRE_CODE) sre_upper_locale(ch) == pattern;
}
/* helpers */
static void
@ -286,7 +295,7 @@ _sre_ascii_iscased_impl(PyObject *module, int character)
/*[clinic end generated code: output=4f454b630fbd19a2 input=9f0bd952812c7ed3]*/
{
unsigned int ch = (unsigned int)character;
return ch != sre_lower(ch) || ch != sre_upper(ch);
return ch != sre_lower_ascii(ch) || ch != sre_upper_ascii(ch);
}
/*[clinic input]
@ -317,7 +326,7 @@ static int
_sre_ascii_tolower_impl(PyObject *module, int character)
/*[clinic end generated code: output=228294ed6ff2a612 input=272c609b5b61f136]*/
{
return sre_lower(character);
return sre_lower_ascii(character);
}
/*[clinic input]
@ -448,19 +457,6 @@ state_init(SRE_STATE* state, PatternObject* pattern, PyObject* string,
state->pos = start;
state->endpos = end;
if (pattern->flags & SRE_FLAG_LOCALE) {
state->lower = sre_lower_locale;
state->upper = sre_upper_locale;
}
else if (pattern->flags & SRE_FLAG_UNICODE) {
state->lower = sre_lower_unicode;
state->upper = sre_upper_unicode;
}
else {
state->lower = sre_lower;
state->upper = sre_upper;
}
return string;
err:
PyMem_Del(state->mark);
@ -1533,7 +1529,7 @@ _validate_charset(SRE_CODE *code, SRE_CODE *end)
break;
case SRE_OP_RANGE:
case SRE_OP_RANGE_IGNORE:
case SRE_OP_RANGE_UNI_IGNORE:
GET_ARG;
GET_ARG;
break;
@ -1630,6 +1626,8 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
case SRE_OP_NOT_LITERAL:
case SRE_OP_LITERAL_IGNORE:
case SRE_OP_NOT_LITERAL_IGNORE:
case SRE_OP_LITERAL_UNI_IGNORE:
case SRE_OP_NOT_LITERAL_UNI_IGNORE:
case SRE_OP_LITERAL_LOC_IGNORE:
case SRE_OP_NOT_LITERAL_LOC_IGNORE:
GET_ARG;
@ -1669,6 +1667,7 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
case SRE_OP_IN:
case SRE_OP_IN_IGNORE:
case SRE_OP_IN_UNI_IGNORE:
case SRE_OP_IN_LOC_IGNORE:
GET_SKIP;
/* Stop 1 before the end; we check the FAILURE below */
@ -1805,6 +1804,8 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
case SRE_OP_GROUPREF:
case SRE_OP_GROUPREF_IGNORE:
case SRE_OP_GROUPREF_UNI_IGNORE:
case SRE_OP_GROUPREF_LOC_IGNORE:
GET_ARG;
if (arg >= (size_t)groups)
FAIL;

4
Modules/sre.h
View File

@ -52,8 +52,6 @@ typedef struct {
Py_ssize_t mark[1];
} MatchObject;
typedef unsigned int (*SRE_TOLOWER_HOOK)(unsigned int ch);
typedef struct SRE_REPEAT_T {
Py_ssize_t count;
SRE_CODE* pattern; /* points to REPEAT operator arguments */
@ -83,8 +81,6 @@ typedef struct {
Py_buffer buffer;
/* current repeat context */
SRE_REPEAT *repeat;
/* hooks */
SRE_TOLOWER_HOOK lower, upper;
} SRE_STATE;
typedef struct {

51
Modules/sre_constants.h
View File

@ -11,7 +11,7 @@
* See the _sre.c file for information on usage and redistribution.
*/
#define SRE_MAGIC 20170530
#define SRE_MAGIC 20171005
#define SRE_OP_FAILURE 0
#define SRE_OP_SUCCESS 1
#define SRE_OP_ANY 2
@ -26,28 +26,33 @@
#define SRE_OP_BIGCHARSET 11
#define SRE_OP_GROUPREF 12
#define SRE_OP_GROUPREF_EXISTS 13
#define SRE_OP_GROUPREF_IGNORE 14
#define SRE_OP_IN 15
#define SRE_OP_IN_IGNORE 16
#define SRE_OP_INFO 17
#define SRE_OP_JUMP 18
#define SRE_OP_LITERAL 19
#define SRE_OP_LITERAL_IGNORE 20
#define SRE_OP_MARK 21
#define SRE_OP_MAX_UNTIL 22
#define SRE_OP_MIN_UNTIL 23
#define SRE_OP_NOT_LITERAL 24
#define SRE_OP_NOT_LITERAL_IGNORE 25
#define SRE_OP_NEGATE 26
#define SRE_OP_RANGE 27
#define SRE_OP_REPEAT 28
#define SRE_OP_REPEAT_ONE 29
#define SRE_OP_SUBPATTERN 30
#define SRE_OP_MIN_REPEAT_ONE 31
#define SRE_OP_RANGE_IGNORE 32
#define SRE_OP_LITERAL_LOC_IGNORE 33
#define SRE_OP_NOT_LITERAL_LOC_IGNORE 34
#define SRE_OP_IN_LOC_IGNORE 35
#define SRE_OP_IN 14
#define SRE_OP_INFO 15
#define SRE_OP_JUMP 16
#define SRE_OP_LITERAL 17
#define SRE_OP_MARK 18
#define SRE_OP_MAX_UNTIL 19
#define SRE_OP_MIN_UNTIL 20
#define SRE_OP_NOT_LITERAL 21
#define SRE_OP_NEGATE 22
#define SRE_OP_RANGE 23
#define SRE_OP_REPEAT 24
#define SRE_OP_REPEAT_ONE 25
#define SRE_OP_SUBPATTERN 26
#define SRE_OP_MIN_REPEAT_ONE 27
#define SRE_OP_GROUPREF_IGNORE 28
#define SRE_OP_IN_IGNORE 29
#define SRE_OP_LITERAL_IGNORE 30
#define SRE_OP_NOT_LITERAL_IGNORE 31
#define SRE_OP_GROUPREF_LOC_IGNORE 32
#define SRE_OP_IN_LOC_IGNORE 33
#define SRE_OP_LITERAL_LOC_IGNORE 34
#define SRE_OP_NOT_LITERAL_LOC_IGNORE 35
#define SRE_OP_GROUPREF_UNI_IGNORE 36
#define SRE_OP_IN_UNI_IGNORE 37
#define SRE_OP_LITERAL_UNI_IGNORE 38
#define SRE_OP_NOT_LITERAL_UNI_IGNORE 39
#define SRE_OP_RANGE_UNI_IGNORE 40
#define SRE_AT_BEGINNING 0
#define SRE_AT_BEGINNING_LINE 1
#define SRE_AT_BEGINNING_STRING 2

136
Modules/sre_lib.h
View File

@ -100,14 +100,6 @@ SRE(at)(SRE_STATE* state, SRE_CHAR* ptr, SRE_CODE at)
return 0;
}
LOCAL(int)
SRE(char_loc_ignore)(SRE_STATE* state, SRE_CODE pattern, SRE_CODE ch)
{
return ch == pattern
|| (SRE_CODE) state->lower(ch) == pattern
|| (SRE_CODE) state->upper(ch) == pattern;
}
LOCAL(int)
SRE(charset)(SRE_STATE* state, SRE_CODE* set, SRE_CODE ch)
{
@ -150,14 +142,14 @@ SRE(charset)(SRE_STATE* state, SRE_CODE* set, SRE_CODE ch)
set += 2;
break;
case SRE_OP_RANGE_IGNORE:
/* <RANGE_IGNORE> <lower> <upper> */
case SRE_OP_RANGE_UNI_IGNORE:
/* <RANGE_UNI_IGNORE> <lower> <upper> */
{
SRE_CODE uch;
/* ch is already lower cased */
if (set[0] <= ch && ch <= set[1])
return ok;
uch = state->upper(ch);
uch = sre_upper_unicode(ch);
if (set[0] <= uch && uch <= set[1])
return ok;
set += 2;
@ -199,11 +191,11 @@ LOCAL(int)
SRE(charset_loc_ignore)(SRE_STATE* state, SRE_CODE* set, SRE_CODE ch)
{
SRE_CODE lo, up;
lo = state->lower(ch);
lo = sre_lower_locale(ch);
if (SRE(charset)(state, set, lo))
return 1;
up = state->upper(ch);
up = sre_upper_locale(ch);
return up != lo && SRE(charset)(state, set, up);
}
@ -263,7 +255,15 @@ SRE(count)(SRE_STATE* state, SRE_CODE* pattern, Py_ssize_t maxcount)
/* repeated literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT LITERAL_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) state->lower(*ptr) == chr)
while (ptr < end && (SRE_CODE) sre_lower_ascii(*ptr) == chr)
ptr++;
break;
case SRE_OP_LITERAL_UNI_IGNORE:
/* repeated literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT LITERAL_UNI_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) sre_lower_unicode(*ptr) == chr)
ptr++;
break;
@ -271,7 +271,7 @@ SRE(count)(SRE_STATE* state, SRE_CODE* pattern, Py_ssize_t maxcount)
/* repeated literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT LITERAL_LOC_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && SRE(char_loc_ignore)(state, chr, *ptr))
while (ptr < end && char_loc_ignore(chr, *ptr))
ptr++;
break;
@ -293,7 +293,15 @@ SRE(count)(SRE_STATE* state, SRE_CODE* pattern, Py_ssize_t maxcount)
/* repeated non-literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT NOT_LITERAL_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) state->lower(*ptr) != chr)
while (ptr < end && (SRE_CODE) sre_lower_ascii(*ptr) != chr)
ptr++;
break;
case SRE_OP_NOT_LITERAL_UNI_IGNORE:
/* repeated non-literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT NOT_LITERAL_UNI_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) sre_lower_unicode(*ptr) != chr)
ptr++;
break;
@ -301,7 +309,7 @@ SRE(count)(SRE_STATE* state, SRE_CODE* pattern, Py_ssize_t maxcount)
/* repeated non-literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT NOT_LITERAL_LOC_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && !SRE(char_loc_ignore)(state, chr, *ptr))
while (ptr < end && !char_loc_ignore(chr, *ptr))
ptr++;
break;
@ -687,7 +695,17 @@ entrance:
TRACE(("|%p|%p|LITERAL_IGNORE %d\n",
ctx->pattern, ctx->ptr, ctx->pattern[0]));
if (ctx->ptr >= end ||
state->lower(*ctx->ptr) != *ctx->pattern)
sre_lower_ascii(*ctx->ptr) != *ctx->pattern)
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
break;
case SRE_OP_LITERAL_UNI_IGNORE:
TRACE(("|%p|%p|LITERAL_UNI_IGNORE %d\n",
ctx->pattern, ctx->ptr, ctx->pattern[0]));
if (ctx->ptr >= end ||
sre_lower_unicode(*ctx->ptr) != *ctx->pattern)
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
@ -697,7 +715,7 @@ entrance:
TRACE(("|%p|%p|LITERAL_LOC_IGNORE %d\n",
ctx->pattern, ctx->ptr, ctx->pattern[0]));
if (ctx->ptr >= end
|| !SRE(char_loc_ignore)(state, *ctx->pattern, *ctx->ptr))
|| !char_loc_ignore(*ctx->pattern, *ctx->ptr))
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
@ -707,7 +725,17 @@ entrance:
TRACE(("|%p|%p|NOT_LITERAL_IGNORE %d\n",
ctx->pattern, ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end ||
state->lower(*ctx->ptr) == *ctx->pattern)
sre_lower_ascii(*ctx->ptr) == *ctx->pattern)
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
break;
case SRE_OP_NOT_LITERAL_UNI_IGNORE:
TRACE(("|%p|%p|NOT_LITERAL_UNI_IGNORE %d\n",
ctx->pattern, ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end ||
sre_lower_unicode(*ctx->ptr) == *ctx->pattern)
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
@ -717,7 +745,7 @@ entrance:
TRACE(("|%p|%p|NOT_LITERAL_LOC_IGNORE %d\n",
ctx->pattern, ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end
|| SRE(char_loc_ignore)(state, *ctx->pattern, *ctx->ptr))
|| char_loc_ignore(*ctx->pattern, *ctx->ptr))
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr++;
@ -727,7 +755,17 @@ entrance:
TRACE(("|%p|%p|IN_IGNORE\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end
|| !SRE(charset)(state, ctx->pattern+1,
(SRE_CODE)state->lower(*ctx->ptr)))
(SRE_CODE)sre_lower_ascii(*ctx->ptr)))
RETURN_FAILURE;
ctx->pattern += ctx->pattern[0];
ctx->ptr++;
break;
case SRE_OP_IN_UNI_IGNORE:
TRACE(("|%p|%p|IN_UNI_IGNORE\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end
|| !SRE(charset)(state, ctx->pattern+1,
(SRE_CODE)sre_lower_unicode(*ctx->ptr)))
RETURN_FAILURE;
ctx->pattern += ctx->pattern[0];
ctx->ptr++;
@ -1135,7 +1173,59 @@ entrance:
RETURN_FAILURE;
while (p < e) {
if (ctx->ptr >= end ||
state->lower(*ctx->ptr) != state->lower(*p))
sre_lower_ascii(*ctx->ptr) != sre_lower_ascii(*p))
RETURN_FAILURE;
p++;
ctx->ptr++;
}
}
}
ctx->pattern++;
break;
case SRE_OP_GROUPREF_UNI_IGNORE:
/* match backreference */
TRACE(("|%p|%p|GROUPREF_UNI_IGNORE %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[0]));
i = ctx->pattern[0];
{
Py_ssize_t groupref = i+i;
if (groupref >= state->lastmark) {
RETURN_FAILURE;
} else {
SRE_CHAR* p = (SRE_CHAR*) state->mark[groupref];
SRE_CHAR* e = (SRE_CHAR*) state->mark[groupref+1];
if (!p || !e || e < p)
RETURN_FAILURE;
while (p < e) {
if (ctx->ptr >= end ||
sre_lower_unicode(*ctx->ptr) != sre_lower_unicode(*p))
RETURN_FAILURE;
p++;
ctx->ptr++;
}
}
}
ctx->pattern++;
break;
case SRE_OP_GROUPREF_LOC_IGNORE:
/* match backreference */
TRACE(("|%p|%p|GROUPREF_LOC_IGNORE %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[0]));
i = ctx->pattern[0];
{
Py_ssize_t groupref = i+i;
if (groupref >= state->lastmark) {
RETURN_FAILURE;
} else {
SRE_CHAR* p = (SRE_CHAR*) state->mark[groupref];
SRE_CHAR* e = (SRE_CHAR*) state->mark[groupref+1];
if (!p || !e || e < p)
RETURN_FAILURE;
while (p < e) {
if (ctx->ptr >= end ||
sre_lower_locale(*ctx->ptr) != sre_lower_locale(*p))
RETURN_FAILURE;
p++;
ctx->ptr++;