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cpython/Modules/_sre.c
Serhiy Storchaka c1b59d4552 Issue #16688: Fix backreferences did make case-insensitive regex fail on non-ASCII strings. 
Patch by Matthew Barnett.
2012-12-29 23:38:48 +02:00

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/*
* Secret Labs' Regular Expression Engine
*
* regular expression matching engine
*
* partial history:
* 1999-10-24 fl created (based on existing template matcher code)
* 2000-03-06 fl first alpha, sort of
* 2000-08-01 fl fixes for 1.6b1
* 2000-08-07 fl use PyOS_CheckStack() if available
* 2000-09-20 fl added expand method
* 2001-03-20 fl lots of fixes for 2.1b2
* 2001-04-15 fl export copyright as Python attribute, not global
* 2001-04-28 fl added __copy__ methods (work in progress)
* 2001-05-14 fl fixes for 1.5.2 compatibility
* 2001-07-01 fl added BIGCHARSET support (from Martin von Loewis)
* 2001-10-18 fl fixed group reset issue (from Matthew Mueller)
* 2001-10-20 fl added split primitive; reenable unicode for 1.6/2.0/2.1
* 2001-10-21 fl added sub/subn primitive
* 2001-10-24 fl added finditer primitive (for 2.2 only)
* 2001-12-07 fl fixed memory leak in sub/subn (Guido van Rossum)
* 2002-11-09 fl fixed empty sub/subn return type
* 2003-04-18 mvl fully support 4-byte codes
* 2003-10-17 gn implemented non recursive scheme
*
* Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
*
* This version of the SRE library can be redistributed under CNRI's
* Python 1.6 license. For any other use, please contact Secret Labs
* AB (info@pythonware.com).
*
* Portions of this engine have been developed in cooperation with
* CNRI. Hewlett-Packard provided funding for 1.6 integration and
* other compatibility work.
*/
#ifndef SRE_RECURSIVE
static char copyright[] =
" SRE 2.2.2 Copyright (c) 1997-2002 by Secret Labs AB ";
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h" /* offsetof */
#include "sre.h"
#include <ctype.h>
/* name of this module, minus the leading underscore */
#if !defined(SRE_MODULE)
#define SRE_MODULE "sre"
#endif
#define SRE_PY_MODULE "re"
/* defining this one enables tracing */
#undef VERBOSE
/* defining this enables unicode support (default under 1.6a1 and later) */
#define HAVE_UNICODE
/* -------------------------------------------------------------------- */
/* optional features */
/* enables fast searching */
#define USE_FAST_SEARCH
/* enables copy/deepcopy handling (work in progress) */
#undef USE_BUILTIN_COPY
#if PY_VERSION_HEX < 0x01060000
#define PyObject_DEL(op) PyMem_DEL((op))
#endif
/* -------------------------------------------------------------------- */
#if defined(_MSC_VER)
#pragma optimize("agtw", on) /* doesn't seem to make much difference... */
#pragma warning(disable: 4710) /* who cares if functions are not inlined ;-) */
/* fastest possible local call under MSVC */
#define LOCAL(type) static __inline type __fastcall
#elif defined(USE_INLINE)
#define LOCAL(type) static inline type
#else
#define LOCAL(type) static type
#endif
/* error codes */
#define SRE_ERROR_ILLEGAL -1 /* illegal opcode */
#define SRE_ERROR_STATE -2 /* illegal state */
#define SRE_ERROR_RECURSION_LIMIT -3 /* runaway recursion */
#define SRE_ERROR_MEMORY -9 /* out of memory */
#define SRE_ERROR_INTERRUPTED -10 /* signal handler raised exception */
#if defined(VERBOSE)
#define TRACE(v) printf v
#else
#define TRACE(v)
#endif
/* -------------------------------------------------------------------- */
/* search engine state */
/* default character predicates (run sre_chars.py to regenerate tables) */
#define SRE_DIGIT_MASK 1
#define SRE_SPACE_MASK 2
#define SRE_LINEBREAK_MASK 4
#define SRE_ALNUM_MASK 8
#define SRE_WORD_MASK 16
/* FIXME: this assumes ASCII. create tables in init_sre() instead */
static char sre_char_info[128] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 2,
2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 0, 0, 0, 0, 0, 0, 0, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 0, 0,
0, 0, 16, 0, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 0, 0, 0, 0, 0 };
static char sre_char_lower[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60,
61, 62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
122, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105,
106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127 };
#define SRE_IS_DIGIT(ch)\
((ch) < 128 ? (sre_char_info[(ch)] & SRE_DIGIT_MASK) : 0)
#define SRE_IS_SPACE(ch)\
((ch) < 128 ? (sre_char_info[(ch)] & SRE_SPACE_MASK) : 0)
#define SRE_IS_LINEBREAK(ch)\
((ch) < 128 ? (sre_char_info[(ch)] & SRE_LINEBREAK_MASK) : 0)
#define SRE_IS_ALNUM(ch)\
((ch) < 128 ? (sre_char_info[(ch)] & SRE_ALNUM_MASK) : 0)
#define SRE_IS_WORD(ch)\
((ch) < 128 ? (sre_char_info[(ch)] & SRE_WORD_MASK) : 0)
static unsigned int sre_lower(unsigned int ch)
{
return ((ch) < 128 ? (unsigned int)sre_char_lower[ch] : ch);
}
/* locale-specific character predicates */
/* !(c & ~N) == (c < N+1) for any unsigned c, this avoids
* warnings when c's type supports only numbers < N+1 */
#define SRE_LOC_IS_DIGIT(ch) (!((ch) & ~255) ? isdigit((ch)) : 0)
#define SRE_LOC_IS_SPACE(ch) (!((ch) & ~255) ? isspace((ch)) : 0)
#define SRE_LOC_IS_LINEBREAK(ch) ((ch) == '\n')
#define SRE_LOC_IS_ALNUM(ch) (!((ch) & ~255) ? isalnum((ch)) : 0)
#define SRE_LOC_IS_WORD(ch) (SRE_LOC_IS_ALNUM((ch)) || (ch) == '_')
static unsigned int sre_lower_locale(unsigned int ch)
{
return ((ch) < 256 ? (unsigned int)tolower((ch)) : ch);
}
/* unicode-specific character predicates */
#define SRE_UNI_IS_DIGIT(ch) Py_UNICODE_ISDECIMAL(ch)
#define SRE_UNI_IS_SPACE(ch) Py_UNICODE_ISSPACE(ch)
#define SRE_UNI_IS_LINEBREAK(ch) Py_UNICODE_ISLINEBREAK(ch)
#define SRE_UNI_IS_ALNUM(ch) Py_UNICODE_ISALNUM(ch)
#define SRE_UNI_IS_WORD(ch) (SRE_UNI_IS_ALNUM(ch) || (ch) == '_')
static unsigned int sre_lower_unicode(unsigned int ch)
{
return (unsigned int) Py_UNICODE_TOLOWER(ch);
}
LOCAL(int)
sre_category(SRE_CODE category, unsigned int ch)
{
switch (category) {
case SRE_CATEGORY_DIGIT:
return SRE_IS_DIGIT(ch);
case SRE_CATEGORY_NOT_DIGIT:
return !SRE_IS_DIGIT(ch);
case SRE_CATEGORY_SPACE:
return SRE_IS_SPACE(ch);
case SRE_CATEGORY_NOT_SPACE:
return !SRE_IS_SPACE(ch);
case SRE_CATEGORY_WORD:
return SRE_IS_WORD(ch);
case SRE_CATEGORY_NOT_WORD:
return !SRE_IS_WORD(ch);
case SRE_CATEGORY_LINEBREAK:
return SRE_IS_LINEBREAK(ch);
case SRE_CATEGORY_NOT_LINEBREAK:
return !SRE_IS_LINEBREAK(ch);
case SRE_CATEGORY_LOC_WORD:
return SRE_LOC_IS_WORD(ch);
case SRE_CATEGORY_LOC_NOT_WORD:
return !SRE_LOC_IS_WORD(ch);
case SRE_CATEGORY_UNI_DIGIT:
return SRE_UNI_IS_DIGIT(ch);
case SRE_CATEGORY_UNI_NOT_DIGIT:
return !SRE_UNI_IS_DIGIT(ch);
case SRE_CATEGORY_UNI_SPACE:
return SRE_UNI_IS_SPACE(ch);
case SRE_CATEGORY_UNI_NOT_SPACE:
return !SRE_UNI_IS_SPACE(ch);
case SRE_CATEGORY_UNI_WORD:
return SRE_UNI_IS_WORD(ch);
case SRE_CATEGORY_UNI_NOT_WORD:
return !SRE_UNI_IS_WORD(ch);
case SRE_CATEGORY_UNI_LINEBREAK:
return SRE_UNI_IS_LINEBREAK(ch);
case SRE_CATEGORY_UNI_NOT_LINEBREAK:
return !SRE_UNI_IS_LINEBREAK(ch);
}
return 0;
}
/* helpers */
static void
data_stack_dealloc(SRE_STATE* state)
{
if (state->data_stack) {
PyMem_FREE(state->data_stack);
state->data_stack = NULL;
}
state->data_stack_size = state->data_stack_base = 0;
}
static int
data_stack_grow(SRE_STATE* state, Py_ssize_t size)
{
Py_ssize_t minsize, cursize;
minsize = state->data_stack_base+size;
cursize = state->data_stack_size;
if (cursize < minsize) {
void* stack;
cursize = minsize+minsize/4+1024;
TRACE(("allocate/grow stack %d\n", cursize));
stack = PyMem_REALLOC(state->data_stack, cursize);
if (!stack) {
data_stack_dealloc(state);
return SRE_ERROR_MEMORY;
}
state->data_stack = (char *)stack;
state->data_stack_size = cursize;
}
return 0;
}
/* generate 8-bit version */
#define SRE_CHAR unsigned char
#define SRE_CHARGET(state, buf, index) ((unsigned char*)buf)[index]
#define SRE_AT sre_at
#define SRE_COUNT sre_count
#define SRE_CHARSET sre_charset
#define SRE_INFO sre_info
#define SRE_MATCH sre_match
#define SRE_MATCH_CONTEXT sre_match_context
#define SRE_SEARCH sre_search
#define SRE_RECURSIVE
#include "_sre.c"
#undef SRE_RECURSIVE
#undef SRE_SEARCH
#undef SRE_MATCH
#undef SRE_MATCH_CONTEXT
#undef SRE_INFO
#undef SRE_CHARSET
#undef SRE_COUNT
#undef SRE_AT
#undef SRE_CHAR
#undef SRE_CHARGET
/* generate 8/16/32-bit unicode version */
#define SRE_CHAR void
#define SRE_CHARGET(state, buf, index) \
((state->charsize==1) ? ((Py_UCS1*)buf)[index] : \
(state->charsize==2) ? ((Py_UCS2*)buf)[index] : \
((Py_UCS4*)buf)[index])
#define SRE_AT sre_uat
#define SRE_COUNT sre_ucount
#define SRE_CHARSET sre_ucharset
#define SRE_INFO sre_uinfo
#define SRE_MATCH sre_umatch
#define SRE_MATCH_CONTEXT sre_umatch_context
#define SRE_SEARCH sre_usearch
#endif /* SRE_RECURSIVE */
/* -------------------------------------------------------------------- */
/* String matching engine */
/* the following section is compiled twice, with different character
settings */
LOCAL(int)
SRE_AT(SRE_STATE* state, char* ptr, SRE_CODE at)
{
/* check if pointer is at given position */
Py_ssize_t thisp, thatp;
switch (at) {
case SRE_AT_BEGINNING:
case SRE_AT_BEGINNING_STRING:
return ((void*) ptr == state->beginning);
case SRE_AT_BEGINNING_LINE:
return ((void*) ptr == state->beginning ||
SRE_IS_LINEBREAK((int) SRE_CHARGET(state, ptr, -1)));
case SRE_AT_END:
return (((void*) (ptr+state->charsize) == state->end &&
SRE_IS_LINEBREAK((int) SRE_CHARGET(state, ptr, 0))) ||
((void*) ptr == state->end));
case SRE_AT_END_LINE:
return ((void*) ptr == state->end ||
SRE_IS_LINEBREAK((int) SRE_CHARGET(state, ptr, 0)));
case SRE_AT_END_STRING:
return ((void*) ptr == state->end);
case SRE_AT_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp != thatp;
case SRE_AT_NON_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp == thatp;
case SRE_AT_LOC_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_LOC_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_LOC_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp != thatp;
case SRE_AT_LOC_NON_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_LOC_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_LOC_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp == thatp;
case SRE_AT_UNI_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_UNI_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_UNI_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp != thatp;
case SRE_AT_UNI_NON_BOUNDARY:
if (state->beginning == state->end)
return 0;
thatp = ((void*) ptr > state->beginning) ?
SRE_UNI_IS_WORD((int) SRE_CHARGET(state, ptr, -1)) : 0;
thisp = ((void*) ptr < state->end) ?
SRE_UNI_IS_WORD((int) SRE_CHARGET(state, ptr, 0)) : 0;
return thisp == thatp;
}
return 0;
}
LOCAL(int)
SRE_CHARSET(SRE_CODE* set, SRE_CODE ch)
{
/* check if character is a member of the given set */
int ok = 1;
for (;;) {
switch (*set++) {
case SRE_OP_FAILURE:
return !ok;
case SRE_OP_LITERAL:
/* <LITERAL> <code> */
if (ch == set[0])
return ok;
set++;
break;
case SRE_OP_CATEGORY:
/* <CATEGORY> <code> */
if (sre_category(set[0], (int) ch))
return ok;
set += 1;
break;
case SRE_OP_CHARSET:
if (sizeof(SRE_CODE) == 2) {
/* <CHARSET> <bitmap> (16 bits per code word) */
if (ch < 256 && (set[ch >> 4] & (1 << (ch & 15))))
return ok;
set += 16;
}
else {
/* <CHARSET> <bitmap> (32 bits per code word) */
if (ch < 256 && (set[ch >> 5] & (1u << (ch & 31))))
return ok;
set += 8;
}
break;
case SRE_OP_RANGE:
/* <RANGE> <lower> <upper> */
if (set[0] <= ch && ch <= set[1])
return ok;
set += 2;
break;
case SRE_OP_NEGATE:
ok = !ok;
break;
case SRE_OP_BIGCHARSET:
/* <BIGCHARSET> <blockcount> <256 blockindices> <blocks> */
{
Py_ssize_t count, block;
count = *(set++);
if (sizeof(SRE_CODE) == 2) {
block = ((char*)set)[ch >> 8];
set += 128;
if (set[block*16 + ((ch & 255)>>4)] & (1 << (ch & 15)))
return ok;
set += count*16;
}
else {
/* !(c & ~N) == (c < N+1) for any unsigned c, this avoids
* warnings when c's type supports only numbers < N+1 */
if (!(ch & ~65535))
block = ((char*)set)[ch >> 8];
else
block = -1;
set += 64;
if (block >=0 &&
(set[block*8 + ((ch & 255)>>5)] & (1u << (ch & 31))))
return ok;
set += count*8;
}
break;
}
default:
/* internal error -- there's not much we can do about it
here, so let's just pretend it didn't match... */
return 0;
}
}
}
LOCAL(Py_ssize_t) SRE_MATCH(SRE_STATE* state, SRE_CODE* pattern);
LOCAL(Py_ssize_t)
SRE_COUNT(SRE_STATE* state, SRE_CODE* pattern, Py_ssize_t maxcount)
{
SRE_CODE chr;
char* ptr = (char *)state->ptr;
char* end = (char *)state->end;
Py_ssize_t i;
/* adjust end */
if (maxcount < (end - ptr) / state->charsize && maxcount != 65535)
end = ptr + maxcount*state->charsize;
switch (pattern[0]) {
case SRE_OP_IN:
/* repeated set */
TRACE(("|%p|%p|COUNT IN\n", pattern, ptr));
while (ptr < end &&
SRE_CHARSET(pattern + 2, SRE_CHARGET(state, ptr, 0)))
ptr += state->charsize;
break;
case SRE_OP_ANY:
/* repeated dot wildcard. */
TRACE(("|%p|%p|COUNT ANY\n", pattern, ptr));
while (ptr < end && !SRE_IS_LINEBREAK(SRE_CHARGET(state, ptr, 0)))
ptr += state->charsize;
break;
case SRE_OP_ANY_ALL:
/* repeated dot wildcard. skip to the end of the target
string, and backtrack from there */
TRACE(("|%p|%p|COUNT ANY_ALL\n", pattern, ptr));
ptr = end;
break;
case SRE_OP_LITERAL:
/* repeated literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT LITERAL %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) SRE_CHARGET(state, ptr, 0) == chr)
ptr += state->charsize;
break;
case SRE_OP_LITERAL_IGNORE:
/* repeated literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT LITERAL_IGNORE %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) state->lower(SRE_CHARGET(state, ptr, 0)) == chr)
ptr += state->charsize;
break;
case SRE_OP_NOT_LITERAL:
/* repeated non-literal */
chr = pattern[1];
TRACE(("|%p|%p|COUNT NOT_LITERAL %d\n", pattern, ptr, chr));
while (ptr < end && (SRE_CODE) SRE_CHARGET(state, ptr, 0) != chr)
ptr += state->charsize;
break;
case SRE_OP_NOT_LITERAL_IGNORE:
/* 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(SRE_CHARGET(state, ptr, 0)) != chr)
ptr += state->charsize;
break;
default:
/* repeated single character pattern */
TRACE(("|%p|%p|COUNT SUBPATTERN\n", pattern, ptr));
while ((char*) state->ptr < end) {
i = SRE_MATCH(state, pattern);
if (i < 0)
return i;
if (!i)
break;
}
TRACE(("|%p|%p|COUNT %d\n", pattern, ptr,
((char*)state->ptr - ptr)/state->charsize));
return ((char*)state->ptr - ptr)/state->charsize;
}
TRACE(("|%p|%p|COUNT %d\n", pattern, ptr, (ptr - (char*) state->ptr)/state->charsize));
return (ptr - (char*) state->ptr)/state->charsize;
}
#if 0 /* not used in this release */
LOCAL(int)
SRE_INFO(SRE_STATE* state, SRE_CODE* pattern)
{
/* check if an SRE_OP_INFO block matches at the current position.
returns the number of SRE_CODE objects to skip if successful, 0
if no match */
char* end = state->end;
char* ptr = state->ptr;
Py_ssize_t i;
/* check minimal length */
if (pattern[3] && (end - ptr)/state->charsize < pattern[3])
return 0;
/* check known prefix */
if (pattern[2] & SRE_INFO_PREFIX && pattern[5] > 1) {
/* <length> <skip> <prefix data> <overlap data> */
for (i = 0; i < pattern[5]; i++)
if ((SRE_CODE) SRE_CHARGET(state, ptr, i) != pattern[7 + i])
return 0;
return pattern[0] + 2 * pattern[6];
}
return pattern[0];
}
#endif
/* The macros below should be used to protect recursive SRE_MATCH()
* calls that *failed* and do *not* return immediately (IOW, those
* that will backtrack). Explaining:
*
* - Recursive SRE_MATCH() returned true: that's usually a success
* (besides atypical cases like ASSERT_NOT), therefore there's no
* reason to restore lastmark;
*
* - Recursive SRE_MATCH() returned false but the current SRE_MATCH()
* is returning to the caller: If the current SRE_MATCH() is the
* top function of the recursion, returning false will be a matching
* failure, and it doesn't matter where lastmark is pointing to.
* If it's *not* the top function, it will be a recursive SRE_MATCH()
* failure by itself, and the calling SRE_MATCH() will have to deal
* with the failure by the same rules explained here (it will restore
* lastmark by itself if necessary);
*
* - Recursive SRE_MATCH() returned false, and will continue the
* outside 'for' loop: must be protected when breaking, since the next
* OP could potentially depend on lastmark;
*
* - Recursive SRE_MATCH() returned false, and will be called again
* inside a local for/while loop: must be protected between each
* loop iteration, since the recursive SRE_MATCH() could do anything,
* and could potentially depend on lastmark.
*
* For more information, check the discussion at SF patch #712900.
*/
#define LASTMARK_SAVE() \
do { \
ctx->lastmark = state->lastmark; \
ctx->lastindex = state->lastindex; \
} while (0)
#define LASTMARK_RESTORE() \
do { \
state->lastmark = ctx->lastmark; \
state->lastindex = ctx->lastindex; \
} while (0)
#define RETURN_ERROR(i) do { return i; } while(0)
#define RETURN_FAILURE do { ret = 0; goto exit; } while(0)
#define RETURN_SUCCESS do { ret = 1; goto exit; } while(0)
#define RETURN_ON_ERROR(i) \
do { if (i < 0) RETURN_ERROR(i); } while (0)
#define RETURN_ON_SUCCESS(i) \
do { RETURN_ON_ERROR(i); if (i > 0) RETURN_SUCCESS; } while (0)
#define RETURN_ON_FAILURE(i) \
do { RETURN_ON_ERROR(i); if (i == 0) RETURN_FAILURE; } while (0)
#define SFY(x) #x
#define DATA_STACK_ALLOC(state, type, ptr) \
do { \
alloc_pos = state->data_stack_base; \
TRACE(("allocating %s in %d (%d)\n", \
SFY(type), alloc_pos, sizeof(type))); \
if (state->data_stack_size < alloc_pos+sizeof(type)) { \
int j = data_stack_grow(state, sizeof(type)); \
if (j < 0) return j; \
if (ctx_pos != -1) \
DATA_STACK_LOOKUP_AT(state, SRE_MATCH_CONTEXT, ctx, ctx_pos); \
} \
ptr = (type*)(state->data_stack+alloc_pos); \
state->data_stack_base += sizeof(type); \
} while (0)
#define DATA_STACK_LOOKUP_AT(state, type, ptr, pos) \
do { \
TRACE(("looking up %s at %d\n", SFY(type), pos)); \
ptr = (type*)(state->data_stack+pos); \
} while (0)
#define DATA_STACK_PUSH(state, data, size) \
do { \
TRACE(("copy data in %p to %d (%d)\n", \
data, state->data_stack_base, size)); \
if (state->data_stack_size < state->data_stack_base+size) { \
int j = data_stack_grow(state, size); \
if (j < 0) return j; \
if (ctx_pos != -1) \
DATA_STACK_LOOKUP_AT(state, SRE_MATCH_CONTEXT, ctx, ctx_pos); \
} \
memcpy(state->data_stack+state->data_stack_base, data, size); \
state->data_stack_base += size; \
} while (0)
#define DATA_STACK_POP(state, data, size, discard) \
do { \
TRACE(("copy data to %p from %d (%d)\n", \
data, state->data_stack_base-size, size)); \
memcpy(data, state->data_stack+state->data_stack_base-size, size); \
if (discard) \
state->data_stack_base -= size; \
} while (0)
#define DATA_STACK_POP_DISCARD(state, size) \
do { \
TRACE(("discard data from %d (%d)\n", \
state->data_stack_base-size, size)); \
state->data_stack_base -= size; \
} while(0)
#define DATA_PUSH(x) \
DATA_STACK_PUSH(state, (x), sizeof(*(x)))
#define DATA_POP(x) \
DATA_STACK_POP(state, (x), sizeof(*(x)), 1)
#define DATA_POP_DISCARD(x) \
DATA_STACK_POP_DISCARD(state, sizeof(*(x)))
#define DATA_ALLOC(t,p) \
DATA_STACK_ALLOC(state, t, p)
#define DATA_LOOKUP_AT(t,p,pos) \
DATA_STACK_LOOKUP_AT(state,t,p,pos)
#define MARK_PUSH(lastmark) \
do if (lastmark > 0) { \
i = lastmark; /* ctx->lastmark may change if reallocated */ \
DATA_STACK_PUSH(state, state->mark, (i+1)*sizeof(void*)); \
} while (0)
#define MARK_POP(lastmark) \
do if (lastmark > 0) { \
DATA_STACK_POP(state, state->mark, (lastmark+1)*sizeof(void*), 1); \
} while (0)
#define MARK_POP_KEEP(lastmark) \
do if (lastmark > 0) { \
DATA_STACK_POP(state, state->mark, (lastmark+1)*sizeof(void*), 0); \
} while (0)
#define MARK_POP_DISCARD(lastmark) \
do if (lastmark > 0) { \
DATA_STACK_POP_DISCARD(state, (lastmark+1)*sizeof(void*)); \
} while (0)
#define JUMP_NONE 0
#define JUMP_MAX_UNTIL_1 1
#define JUMP_MAX_UNTIL_2 2
#define JUMP_MAX_UNTIL_3 3
#define JUMP_MIN_UNTIL_1 4
#define JUMP_MIN_UNTIL_2 5
#define JUMP_MIN_UNTIL_3 6
#define JUMP_REPEAT 7
#define JUMP_REPEAT_ONE_1 8
#define JUMP_REPEAT_ONE_2 9
#define JUMP_MIN_REPEAT_ONE 10
#define JUMP_BRANCH 11
#define JUMP_ASSERT 12
#define JUMP_ASSERT_NOT 13
#define DO_JUMP(jumpvalue, jumplabel, nextpattern) \
DATA_ALLOC(SRE_MATCH_CONTEXT, nextctx); \
nextctx->last_ctx_pos = ctx_pos; \
nextctx->jump = jumpvalue; \
nextctx->pattern = nextpattern; \
ctx_pos = alloc_pos; \
ctx = nextctx; \
goto entrance; \
jumplabel: \
while (0) /* gcc doesn't like labels at end of scopes */ \
typedef struct {
Py_ssize_t last_ctx_pos;
Py_ssize_t jump;
char* ptr;
SRE_CODE* pattern;
Py_ssize_t count;
Py_ssize_t lastmark;
Py_ssize_t lastindex;
union {
SRE_CODE chr;
SRE_REPEAT* rep;
} u;
} SRE_MATCH_CONTEXT;
/* check if string matches the given pattern. returns <0 for
error, 0 for failure, and 1 for success */
LOCAL(Py_ssize_t)
SRE_MATCH(SRE_STATE* state, SRE_CODE* pattern)
{
char* end = (char*)state->end;
Py_ssize_t alloc_pos, ctx_pos = -1;
Py_ssize_t i, ret = 0;
Py_ssize_t jump;
unsigned int sigcount=0;
SRE_MATCH_CONTEXT* ctx;
SRE_MATCH_CONTEXT* nextctx;
TRACE(("|%p|%p|ENTER\n", pattern, state->ptr));
DATA_ALLOC(SRE_MATCH_CONTEXT, ctx);
ctx->last_ctx_pos = -1;
ctx->jump = JUMP_NONE;
ctx->pattern = pattern;
ctx_pos = alloc_pos;
entrance:
ctx->ptr = (char *)state->ptr;
if (ctx->pattern[0] == SRE_OP_INFO) {
/* optimization info block */
/* <INFO> <1=skip> <2=flags> <3=min> ... */
if (ctx->pattern[3] && (end - ctx->ptr)/state->charsize < ctx->pattern[3]) {
TRACE(("reject (got %d chars, need %d)\n",
(end - ctx->ptr)/state->charsize, ctx->pattern[3]));
RETURN_FAILURE;
}
ctx->pattern += ctx->pattern[1] + 1;
}
for (;;) {
++sigcount;
if ((0 == (sigcount & 0xfff)) && PyErr_CheckSignals())
RETURN_ERROR(SRE_ERROR_INTERRUPTED);
switch (*ctx->pattern++) {
case SRE_OP_MARK:
/* set mark */
/* <MARK> <gid> */
TRACE(("|%p|%p|MARK %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[0]));
i = ctx->pattern[0];
if (i & 1)
state->lastindex = i/2 + 1;
if (i > state->lastmark) {
/* state->lastmark is the highest valid index in the
state->mark array. If it is increased by more than 1,
the intervening marks must be set to NULL to signal
that these marks have not been encountered. */
Py_ssize_t j = state->lastmark + 1;
while (j < i)
state->mark[j++] = NULL;
state->lastmark = i;
}
state->mark[i] = ctx->ptr;
ctx->pattern++;
break;
case SRE_OP_LITERAL:
/* match literal string */
/* <LITERAL> <code> */
TRACE(("|%p|%p|LITERAL %d\n", ctx->pattern,
ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end || (SRE_CODE) SRE_CHARGET(state, ctx->ptr, 0) != ctx->pattern[0])
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr += state->charsize;
break;
case SRE_OP_NOT_LITERAL:
/* match anything that is not literal character */
/* <NOT_LITERAL> <code> */
TRACE(("|%p|%p|NOT_LITERAL %d\n", ctx->pattern,
ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end || (SRE_CODE) SRE_CHARGET(state, ctx->ptr, 0) == ctx->pattern[0])
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr += state->charsize;
break;
case SRE_OP_SUCCESS:
/* end of pattern */
TRACE(("|%p|%p|SUCCESS\n", ctx->pattern, ctx->ptr));
state->ptr = ctx->ptr;
RETURN_SUCCESS;
case SRE_OP_AT:
/* match at given position */
/* <AT> <code> */
TRACE(("|%p|%p|AT %d\n", ctx->pattern, ctx->ptr, *ctx->pattern));
if (!SRE_AT(state, ctx->ptr, *ctx->pattern))
RETURN_FAILURE;
ctx->pattern++;
break;
case SRE_OP_CATEGORY:
/* match at given category */
/* <CATEGORY> <code> */
TRACE(("|%p|%p|CATEGORY %d\n", ctx->pattern,
ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end || !sre_category(ctx->pattern[0], SRE_CHARGET(state, ctx->ptr, 0)))
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr += state->charsize;
break;
case SRE_OP_ANY:
/* match anything (except a newline) */
/* <ANY> */
TRACE(("|%p|%p|ANY\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end || SRE_IS_LINEBREAK(SRE_CHARGET(state, ctx->ptr, 0)))
RETURN_FAILURE;
ctx->ptr += state->charsize;
break;
case SRE_OP_ANY_ALL:
/* match anything */
/* <ANY_ALL> */
TRACE(("|%p|%p|ANY_ALL\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end)
RETURN_FAILURE;
ctx->ptr += state->charsize;
break;
case SRE_OP_IN:
/* match set member (or non_member) */
/* <IN> <skip> <set> */
TRACE(("|%p|%p|IN\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end || !SRE_CHARSET(ctx->pattern + 1, SRE_CHARGET(state, ctx->ptr, 0)))
RETURN_FAILURE;
ctx->pattern += ctx->pattern[0];
ctx->ptr += state->charsize;
break;
case SRE_OP_LITERAL_IGNORE:
TRACE(("|%p|%p|LITERAL_IGNORE %d\n",
ctx->pattern, ctx->ptr, ctx->pattern[0]));
if (ctx->ptr >= end ||
state->lower(SRE_CHARGET(state, ctx->ptr, 0)) != state->lower(*ctx->pattern))
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr += state->charsize;
break;
case SRE_OP_NOT_LITERAL_IGNORE:
TRACE(("|%p|%p|NOT_LITERAL_IGNORE %d\n",
ctx->pattern, ctx->ptr, *ctx->pattern));
if (ctx->ptr >= end ||
state->lower(SRE_CHARGET(state, ctx->ptr, 0)) == state->lower(*ctx->pattern))
RETURN_FAILURE;
ctx->pattern++;
ctx->ptr += state->charsize;
break;
case SRE_OP_IN_IGNORE:
TRACE(("|%p|%p|IN_IGNORE\n", ctx->pattern, ctx->ptr));
if (ctx->ptr >= end
|| !SRE_CHARSET(ctx->pattern+1,
(SRE_CODE)state->lower(SRE_CHARGET(state, ctx->ptr, 0))))
RETURN_FAILURE;
ctx->pattern += ctx->pattern[0];
ctx->ptr += state->charsize;
break;
case SRE_OP_JUMP:
case SRE_OP_INFO:
/* jump forward */
/* <JUMP> <offset> */
TRACE(("|%p|%p|JUMP %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[0]));
ctx->pattern += ctx->pattern[0];
break;
case SRE_OP_BRANCH:
/* alternation */
/* <BRANCH> <0=skip> code <JUMP> ... <NULL> */
TRACE(("|%p|%p|BRANCH\n", ctx->pattern, ctx->ptr));
LASTMARK_SAVE();
ctx->u.rep = state->repeat;
if (ctx->u.rep)
MARK_PUSH(ctx->lastmark);
for (; ctx->pattern[0]; ctx->pattern += ctx->pattern[0]) {
if (ctx->pattern[1] == SRE_OP_LITERAL &&
(ctx->ptr >= end ||
(SRE_CODE) SRE_CHARGET(state, ctx->ptr, 0) != ctx->pattern[2]))
continue;
if (ctx->pattern[1] == SRE_OP_IN &&
(ctx->ptr >= end ||
!SRE_CHARSET(ctx->pattern + 3, (SRE_CODE) SRE_CHARGET(state, ctx->ptr, 0))))
continue;
state->ptr = ctx->ptr;
DO_JUMP(JUMP_BRANCH, jump_branch, ctx->pattern+1);
if (ret) {
if (ctx->u.rep)
MARK_POP_DISCARD(ctx->lastmark);
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
if (ctx->u.rep)
MARK_POP_KEEP(ctx->lastmark);
LASTMARK_RESTORE();
}
if (ctx->u.rep)
MARK_POP_DISCARD(ctx->lastmark);
RETURN_FAILURE;
case SRE_OP_REPEAT_ONE:
/* match repeated sequence (maximizing regexp) */
/* this operator only works if the repeated item is
exactly one character wide, and we're not already
collecting backtracking points. for other cases,
use the MAX_REPEAT operator */
/* <REPEAT_ONE> <skip> <1=min> <2=max> item <SUCCESS> tail */
TRACE(("|%p|%p|REPEAT_ONE %d %d\n", ctx->pattern, ctx->ptr,
ctx->pattern[1], ctx->pattern[2]));
if (ctx->ptr + state->charsize * ctx->pattern[1] > end)
RETURN_FAILURE; /* cannot match */
state->ptr = ctx->ptr;
ret = SRE_COUNT(state, ctx->pattern+3, ctx->pattern[2]);
RETURN_ON_ERROR(ret);
DATA_LOOKUP_AT(SRE_MATCH_CONTEXT, ctx, ctx_pos);
ctx->count = ret;
ctx->ptr += state->charsize * ctx->count;
/* when we arrive here, count contains the number of
matches, and ctx->ptr points to the tail of the target
string. check if the rest of the pattern matches,
and backtrack if not. */
if (ctx->count < (Py_ssize_t) ctx->pattern[1])
RETURN_FAILURE;
if (ctx->pattern[ctx->pattern[0]] == SRE_OP_SUCCESS) {
/* tail is empty. we're finished */
state->ptr = ctx->ptr;
RETURN_SUCCESS;
}
LASTMARK_SAVE();
if (ctx->pattern[ctx->pattern[0]] == SRE_OP_LITERAL) {
/* tail starts with a literal. skip positions where
the rest of the pattern cannot possibly match */
ctx->u.chr = ctx->pattern[ctx->pattern[0]+1];
for (;;) {
while (ctx->count >= (Py_ssize_t) ctx->pattern[1] &&
(ctx->ptr >= end ||
SRE_CHARGET(state, ctx->ptr, 0) != ctx->u.chr)) {
ctx->ptr -= state->charsize;
ctx->count--;
}
if (ctx->count < (Py_ssize_t) ctx->pattern[1])
break;
state->ptr = ctx->ptr;
DO_JUMP(JUMP_REPEAT_ONE_1, jump_repeat_one_1,
ctx->pattern+ctx->pattern[0]);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
LASTMARK_RESTORE();
ctx->ptr -= state->charsize;
ctx->count--;
}
} else {
/* general case */
while (ctx->count >= (Py_ssize_t) ctx->pattern[1]) {
state->ptr = ctx->ptr;
DO_JUMP(JUMP_REPEAT_ONE_2, jump_repeat_one_2,
ctx->pattern+ctx->pattern[0]);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
ctx->ptr -= state->charsize;
ctx->count--;
LASTMARK_RESTORE();
}
}
RETURN_FAILURE;
case SRE_OP_MIN_REPEAT_ONE:
/* match repeated sequence (minimizing regexp) */
/* this operator only works if the repeated item is
exactly one character wide, and we're not already
collecting backtracking points. for other cases,
use the MIN_REPEAT operator */
/* <MIN_REPEAT_ONE> <skip> <1=min> <2=max> item <SUCCESS> tail */
TRACE(("|%p|%p|MIN_REPEAT_ONE %d %d\n", ctx->pattern, ctx->ptr,
ctx->pattern[1], ctx->pattern[2]));
if (ctx->ptr + state->charsize * ctx->pattern[1] > end)
RETURN_FAILURE; /* cannot match */
state->ptr = ctx->ptr;
if (ctx->pattern[1] == 0)
ctx->count = 0;
else {
/* count using pattern min as the maximum */
ret = SRE_COUNT(state, ctx->pattern+3, ctx->pattern[1]);
RETURN_ON_ERROR(ret);
DATA_LOOKUP_AT(SRE_MATCH_CONTEXT, ctx, ctx_pos);
if (ret < (Py_ssize_t) ctx->pattern[1])
/* didn't match minimum number of times */
RETURN_FAILURE;
/* advance past minimum matches of repeat */
ctx->count = ret;
ctx->ptr += state->charsize * ctx->count;
}
if (ctx->pattern[ctx->pattern[0]] == SRE_OP_SUCCESS) {
/* tail is empty. we're finished */
state->ptr = ctx->ptr;
RETURN_SUCCESS;
} else {
/* general case */
LASTMARK_SAVE();
while ((Py_ssize_t)ctx->pattern[2] == 65535
|| ctx->count <= (Py_ssize_t)ctx->pattern[2]) {
state->ptr = ctx->ptr;
DO_JUMP(JUMP_MIN_REPEAT_ONE,jump_min_repeat_one,
ctx->pattern+ctx->pattern[0]);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
state->ptr = ctx->ptr;
ret = SRE_COUNT(state, ctx->pattern+3, 1);
RETURN_ON_ERROR(ret);
DATA_LOOKUP_AT(SRE_MATCH_CONTEXT, ctx, ctx_pos);
if (ret == 0)
break;
assert(ret == 1);
ctx->ptr += state->charsize;
ctx->count++;
LASTMARK_RESTORE();
}
}
RETURN_FAILURE;
case SRE_OP_REPEAT:
/* create repeat context. all the hard work is done
by the UNTIL operator (MAX_UNTIL, MIN_UNTIL) */
/* <REPEAT> <skip> <1=min> <2=max> item <UNTIL> tail */
TRACE(("|%p|%p|REPEAT %d %d\n", ctx->pattern, ctx->ptr,
ctx->pattern[1], ctx->pattern[2]));
/* install new repeat context */
ctx->u.rep = (SRE_REPEAT*) PyObject_MALLOC(sizeof(*ctx->u.rep));
if (!ctx->u.rep) {
PyErr_NoMemory();
RETURN_FAILURE;
}
ctx->u.rep->count = -1;
ctx->u.rep->pattern = ctx->pattern;
ctx->u.rep->prev = state->repeat;
ctx->u.rep->last_ptr = NULL;
state->repeat = ctx->u.rep;
state->ptr = ctx->ptr;
DO_JUMP(JUMP_REPEAT, jump_repeat, ctx->pattern+ctx->pattern[0]);
state->repeat = ctx->u.rep->prev;
PyObject_FREE(ctx->u.rep);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
RETURN_FAILURE;
case SRE_OP_MAX_UNTIL:
/* maximizing repeat */
/* <REPEAT> <skip> <1=min> <2=max> item <MAX_UNTIL> tail */
/* FIXME: we probably need to deal with zero-width
matches in here... */
ctx->u.rep = state->repeat;
if (!ctx->u.rep)
RETURN_ERROR(SRE_ERROR_STATE);
state->ptr = ctx->ptr;
ctx->count = ctx->u.rep->count+1;
TRACE(("|%p|%p|MAX_UNTIL %d\n", ctx->pattern,
ctx->ptr, ctx->count));
if (ctx->count < ctx->u.rep->pattern[1]) {
/* not enough matches */
ctx->u.rep->count = ctx->count;
DO_JUMP(JUMP_MAX_UNTIL_1, jump_max_until_1,
ctx->u.rep->pattern+3);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
ctx->u.rep->count = ctx->count-1;
state->ptr = ctx->ptr;
RETURN_FAILURE;
}
if ((ctx->count < ctx->u.rep->pattern[2] ||
ctx->u.rep->pattern[2] == 65535) &&
state->ptr != ctx->u.rep->last_ptr) {
/* we may have enough matches, but if we can
match another item, do so */
ctx->u.rep->count = ctx->count;
LASTMARK_SAVE();
MARK_PUSH(ctx->lastmark);
/* zero-width match protection */
DATA_PUSH(&ctx->u.rep->last_ptr);
ctx->u.rep->last_ptr = state->ptr;
DO_JUMP(JUMP_MAX_UNTIL_2, jump_max_until_2,
ctx->u.rep->pattern+3);
DATA_POP(&ctx->u.rep->last_ptr);
if (ret) {
MARK_POP_DISCARD(ctx->lastmark);
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
MARK_POP(ctx->lastmark);
LASTMARK_RESTORE();
ctx->u.rep->count = ctx->count-1;
state->ptr = ctx->ptr;
}
/* cannot match more repeated items here. make sure the
tail matches */
state->repeat = ctx->u.rep->prev;
DO_JUMP(JUMP_MAX_UNTIL_3, jump_max_until_3, ctx->pattern);
RETURN_ON_SUCCESS(ret);
state->repeat = ctx->u.rep;
state->ptr = ctx->ptr;
RETURN_FAILURE;
case SRE_OP_MIN_UNTIL:
/* minimizing repeat */
/* <REPEAT> <skip> <1=min> <2=max> item <MIN_UNTIL> tail */
ctx->u.rep = state->repeat;
if (!ctx->u.rep)
RETURN_ERROR(SRE_ERROR_STATE);
state->ptr = ctx->ptr;
ctx->count = ctx->u.rep->count+1;
TRACE(("|%p|%p|MIN_UNTIL %d %p\n", ctx->pattern,
ctx->ptr, ctx->count, ctx->u.rep->pattern));
if (ctx->count < ctx->u.rep->pattern[1]) {
/* not enough matches */
ctx->u.rep->count = ctx->count;
DO_JUMP(JUMP_MIN_UNTIL_1, jump_min_until_1,
ctx->u.rep->pattern+3);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
ctx->u.rep->count = ctx->count-1;
state->ptr = ctx->ptr;
RETURN_FAILURE;
}
LASTMARK_SAVE();
/* see if the tail matches */
state->repeat = ctx->u.rep->prev;
DO_JUMP(JUMP_MIN_UNTIL_2, jump_min_until_2, ctx->pattern);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
state->repeat = ctx->u.rep;
state->ptr = ctx->ptr;
LASTMARK_RESTORE();
if (ctx->count >= ctx->u.rep->pattern[2]
&& ctx->u.rep->pattern[2] != 65535)
RETURN_FAILURE;
ctx->u.rep->count = ctx->count;
DO_JUMP(JUMP_MIN_UNTIL_3,jump_min_until_3,
ctx->u.rep->pattern+3);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_SUCCESS;
}
ctx->u.rep->count = ctx->count-1;
state->ptr = ctx->ptr;
RETURN_FAILURE;
case SRE_OP_GROUPREF:
/* match backreference */
TRACE(("|%p|%p|GROUPREF %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 {
char* p = (char*) state->mark[groupref];
char* e = (char*) state->mark[groupref+1];
if (!p || !e || e < p)
RETURN_FAILURE;
while (p < e) {
if (ctx->ptr >= end ||
SRE_CHARGET(state, ctx->ptr, 0) != SRE_CHARGET(state, p, 0))
RETURN_FAILURE;
p += state->charsize;
ctx->ptr += state->charsize;
}
}
}
ctx->pattern++;
break;
case SRE_OP_GROUPREF_IGNORE:
/* match backreference */
TRACE(("|%p|%p|GROUPREF_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 {
char* p = (char*) state->mark[groupref];
char* e = (char*) state->mark[groupref+1];
if (!p || !e || e < p)
RETURN_FAILURE;
while (p < e) {
if (ctx->ptr >= end ||
state->lower(SRE_CHARGET(state, ctx->ptr, 0)) !=
state->lower(SRE_CHARGET(state, p, 0)))
RETURN_FAILURE;
p += state->charsize;
ctx->ptr += state->charsize;
}
}
}
ctx->pattern++;
break;
case SRE_OP_GROUPREF_EXISTS:
TRACE(("|%p|%p|GROUPREF_EXISTS %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[0]));
/* <GROUPREF_EXISTS> <group> <skip> codeyes <JUMP> codeno ... */
i = ctx->pattern[0];
{
Py_ssize_t groupref = i+i;
if (groupref >= state->lastmark) {
ctx->pattern += ctx->pattern[1];
break;
} else {
SRE_CHAR* p = (SRE_CHAR*) state->mark[groupref];
SRE_CHAR* e = (SRE_CHAR*) state->mark[groupref+1];
if (!p || !e || e < p) {
ctx->pattern += ctx->pattern[1];
break;
}
}
}
ctx->pattern += 2;
break;
case SRE_OP_ASSERT:
/* assert subpattern */
/* <ASSERT> <skip> <back> <pattern> */
TRACE(("|%p|%p|ASSERT %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[1]));
state->ptr = ctx->ptr - state->charsize * ctx->pattern[1];
if (state->ptr < state->beginning)
RETURN_FAILURE;
DO_JUMP(JUMP_ASSERT, jump_assert, ctx->pattern+2);
RETURN_ON_FAILURE(ret);
ctx->pattern += ctx->pattern[0];
break;
case SRE_OP_ASSERT_NOT:
/* assert not subpattern */
/* <ASSERT_NOT> <skip> <back> <pattern> */
TRACE(("|%p|%p|ASSERT_NOT %d\n", ctx->pattern,
ctx->ptr, ctx->pattern[1]));
state->ptr = ctx->ptr - state->charsize * ctx->pattern[1];
if (state->ptr >= state->beginning) {
DO_JUMP(JUMP_ASSERT_NOT, jump_assert_not, ctx->pattern+2);
if (ret) {
RETURN_ON_ERROR(ret);
RETURN_FAILURE;
}
}
ctx->pattern += ctx->pattern[0];
break;
case SRE_OP_FAILURE:
/* immediate failure */
TRACE(("|%p|%p|FAILURE\n", ctx->pattern, ctx->ptr));
RETURN_FAILURE;
default:
TRACE(("|%p|%p|UNKNOWN %d\n", ctx->pattern, ctx->ptr,
ctx->pattern[-1]));
RETURN_ERROR(SRE_ERROR_ILLEGAL);
}
}
exit:
ctx_pos = ctx->last_ctx_pos;
jump = ctx->jump;
DATA_POP_DISCARD(ctx);
if (ctx_pos == -1)
return ret;
DATA_LOOKUP_AT(SRE_MATCH_CONTEXT, ctx, ctx_pos);
switch (jump) {
case JUMP_MAX_UNTIL_2:
TRACE(("|%p|%p|JUMP_MAX_UNTIL_2\n", ctx->pattern, ctx->ptr));
goto jump_max_until_2;
case JUMP_MAX_UNTIL_3:
TRACE(("|%p|%p|JUMP_MAX_UNTIL_3\n", ctx->pattern, ctx->ptr));
goto jump_max_until_3;
case JUMP_MIN_UNTIL_2:
TRACE(("|%p|%p|JUMP_MIN_UNTIL_2\n", ctx->pattern, ctx->ptr));
goto jump_min_until_2;
case JUMP_MIN_UNTIL_3:
TRACE(("|%p|%p|JUMP_MIN_UNTIL_3\n", ctx->pattern, ctx->ptr));
goto jump_min_until_3;
case JUMP_BRANCH:
TRACE(("|%p|%p|JUMP_BRANCH\n", ctx->pattern, ctx->ptr));
goto jump_branch;
case JUMP_MAX_UNTIL_1:
TRACE(("|%p|%p|JUMP_MAX_UNTIL_1\n", ctx->pattern, ctx->ptr));
goto jump_max_until_1;
case JUMP_MIN_UNTIL_1:
TRACE(("|%p|%p|JUMP_MIN_UNTIL_1\n", ctx->pattern, ctx->ptr));
goto jump_min_until_1;
case JUMP_REPEAT:
TRACE(("|%p|%p|JUMP_REPEAT\n", ctx->pattern, ctx->ptr));
goto jump_repeat;
case JUMP_REPEAT_ONE_1:
TRACE(("|%p|%p|JUMP_REPEAT_ONE_1\n", ctx->pattern, ctx->ptr));
goto jump_repeat_one_1;
case JUMP_REPEAT_ONE_2:
TRACE(("|%p|%p|JUMP_REPEAT_ONE_2\n", ctx->pattern, ctx->ptr));
goto jump_repeat_one_2;
case JUMP_MIN_REPEAT_ONE:
TRACE(("|%p|%p|JUMP_MIN_REPEAT_ONE\n", ctx->pattern, ctx->ptr));
goto jump_min_repeat_one;
case JUMP_ASSERT:
TRACE(("|%p|%p|JUMP_ASSERT\n", ctx->pattern, ctx->ptr));
goto jump_assert;
case JUMP_ASSERT_NOT:
TRACE(("|%p|%p|JUMP_ASSERT_NOT\n", ctx->pattern, ctx->ptr));
goto jump_assert_not;
case JUMP_NONE:
TRACE(("|%p|%p|RETURN %d\n", ctx->pattern, ctx->ptr, ret));
break;
}
return ret; /* should never get here */
}
LOCAL(Py_ssize_t)
SRE_SEARCH(SRE_STATE* state, SRE_CODE* pattern)
{
char* ptr = (char*)state->start;
char* end = (char*)state->end;
Py_ssize_t status = 0;
Py_ssize_t prefix_len = 0;
Py_ssize_t prefix_skip = 0;
SRE_CODE* prefix = NULL;
SRE_CODE* charset = NULL;
SRE_CODE* overlap = NULL;
int flags = 0;
if (pattern[0] == SRE_OP_INFO) {
/* optimization info block */
/* <INFO> <1=skip> <2=flags> <3=min> <4=max> <5=prefix info> */
flags = pattern[2];
if (pattern[3] > 1) {
/* adjust end point (but make sure we leave at least one
character in there, so literal search will work) */
end -= (pattern[3]-1) * state->charsize;
if (end <= ptr)
end = ptr + state->charsize;
}
if (flags & SRE_INFO_PREFIX) {
/* pattern starts with a known prefix */
/* <length> <skip> <prefix data> <overlap data> */
prefix_len = pattern[5];
prefix_skip = pattern[6];
prefix = pattern + 7;
overlap = prefix + prefix_len - 1;
} else if (flags & SRE_INFO_CHARSET)
/* pattern starts with a character from a known set */
/* <charset> */
charset = pattern + 5;
pattern += 1 + pattern[1];
}
TRACE(("prefix = %p %d %d\n", prefix, prefix_len, prefix_skip));
TRACE(("charset = %p\n", charset));
#if defined(USE_FAST_SEARCH)
if (prefix_len > 1) {
/* pattern starts with a known prefix. use the overlap
table to skip forward as fast as we possibly can */
Py_ssize_t i = 0;
end = (char *)state->end;
while (ptr < end) {
for (;;) {
if ((SRE_CODE) SRE_CHARGET(state, ptr, 0) != prefix[i]) {
if (!i)
break;
else
i = overlap[i];
} else {
if (++i == prefix_len) {
/* found a potential match */
TRACE(("|%p|%p|SEARCH SCAN\n", pattern, ptr));
state->start = ptr - (prefix_len - 1) * state->charsize;
state->ptr = ptr - (prefix_len - prefix_skip - 1) * state->charsize;
if (flags & SRE_INFO_LITERAL)
return 1; /* we got all of it */
status = SRE_MATCH(state, pattern + 2*prefix_skip);
if (status != 0)
return status;
/* close but no cigar -- try again */
i = overlap[i];
}
break;
}
}
ptr += state->charsize;
}
return 0;
}
#endif
if (pattern[0] == SRE_OP_LITERAL) {
/* pattern starts with a literal character. this is used
for short prefixes, and if fast search is disabled */
SRE_CODE chr = pattern[1];
end = (char*)state->end;
for (;;) {
while (ptr < end && (SRE_CODE) SRE_CHARGET(state, ptr, 0) != chr)
ptr += state->charsize;
if (ptr >= end)
return 0;
TRACE(("|%p|%p|SEARCH LITERAL\n", pattern, ptr));
state->start = ptr;
ptr += state->charsize;
state->ptr = ptr;
if (flags & SRE_INFO_LITERAL)
return 1; /* we got all of it */
status = SRE_MATCH(state, pattern + 2);
if (status != 0)
break;
}
} else if (charset) {
/* pattern starts with a character from a known set */
end = (char*)state->end;
for (;;) {
while (ptr < end && !SRE_CHARSET(charset, SRE_CHARGET(state, ptr, 0)))
ptr += state->charsize;
if (ptr >= end)
return 0;
TRACE(("|%p|%p|SEARCH CHARSET\n", pattern, ptr));
state->start = ptr;
state->ptr = ptr;
status = SRE_MATCH(state, pattern);
if (status != 0)
break;
ptr += state->charsize;
}
} else
/* general case */
while (ptr <= end) {
TRACE(("|%p|%p|SEARCH\n", pattern, ptr));
state->start = state->ptr = ptr;
ptr += state->charsize;
status = SRE_MATCH(state, pattern);
if (status != 0)
break;
}
return status;
}
#if !defined(SRE_RECURSIVE)
/* -------------------------------------------------------------------- */
/* factories and destructors */
/* see sre.h for object declarations */
static PyObject*pattern_new_match(PatternObject*, SRE_STATE*, int);
static PyObject*pattern_scanner(PatternObject*, PyObject*, PyObject* kw);
static int
sre_literal_template(int charsize, char* ptr, Py_ssize_t len)
{
/* check if given string is a literal template (i.e. no escapes) */
struct {
int charsize;
} state = {
charsize
};
while (len-- > 0) {
if (SRE_CHARGET((&state), ptr, 0) == '\\')
return 0;
ptr += charsize;
}
return 1;
}
static PyObject *
sre_codesize(PyObject* self, PyObject *unused)
{
return PyLong_FromSize_t(sizeof(SRE_CODE));
}
static PyObject *
sre_getlower(PyObject* self, PyObject* args)
{
int character, flags;
if (!PyArg_ParseTuple(args, "ii", &character, &flags))
return NULL;
if (flags & SRE_FLAG_LOCALE)
return Py_BuildValue("i", sre_lower_locale(character));
if (flags & SRE_FLAG_UNICODE)
return Py_BuildValue("i", sre_lower_unicode(character));
return Py_BuildValue("i", sre_lower(character));
}
LOCAL(void)
state_reset(SRE_STATE* state)
{
/* FIXME: dynamic! */
/*memset(state->mark, 0, sizeof(*state->mark) * SRE_MARK_SIZE);*/
state->lastmark = -1;
state->lastindex = -1;
state->repeat = NULL;
data_stack_dealloc(state);
}
static void*
getstring(PyObject* string, Py_ssize_t* p_length,
int* p_logical_charsize, int* p_charsize,
Py_buffer *view)
{
/* given a python object, return a data pointer, a length (in
characters), and a character size. return NULL if the object
is not a string (or not compatible) */
PyBufferProcs *buffer;
Py_ssize_t size, bytes;
int charsize;
void* ptr;
/* Unicode objects do not support the buffer API. So, get the data
directly instead. */
if (PyUnicode_Check(string)) {
if (PyUnicode_READY(string) == -1)
return NULL;
ptr = PyUnicode_DATA(string);
*p_length = PyUnicode_GET_LENGTH(string);
*p_charsize = PyUnicode_KIND(string);
*p_logical_charsize = 4;
return ptr;
}
/* get pointer to byte string buffer */
view->len = -1;
buffer = Py_TYPE(string)->tp_as_buffer;
if (!buffer || !buffer->bf_getbuffer ||
(*buffer->bf_getbuffer)(string, view, PyBUF_SIMPLE) < 0) {
PyErr_SetString(PyExc_TypeError, "expected string or buffer");
return NULL;
}
/* determine buffer size */
bytes = view->len;
ptr = view->buf;
if (bytes < 0) {
PyErr_SetString(PyExc_TypeError, "buffer has negative size");
goto err;
}
/* determine character size */
size = PyObject_Size(string);
if (PyBytes_Check(string) || bytes == size)
charsize = 1;
else {
PyErr_SetString(PyExc_TypeError, "buffer size mismatch");
goto err;
}
*p_length = size;
*p_charsize = charsize;
*p_logical_charsize = charsize;
if (ptr == NULL) {
PyErr_SetString(PyExc_ValueError,
"Buffer is NULL");
goto err;
}
return ptr;
err:
PyBuffer_Release(view);
view->buf = NULL;
return NULL;
}
LOCAL(PyObject*)
state_init(SRE_STATE* state, PatternObject* pattern, PyObject* string,
Py_ssize_t start, Py_ssize_t end)
{
/* prepare state object */
Py_ssize_t length;
int logical_charsize, charsize;
void* ptr;
memset(state, 0, sizeof(SRE_STATE));
state->lastmark = -1;
state->lastindex = -1;
state->buffer.buf = NULL;
ptr = getstring(string, &length, &logical_charsize, &charsize, &state->buffer);
if (!ptr)
goto err;
if (logical_charsize == 1 && pattern->logical_charsize > 1) {
PyErr_SetString(PyExc_TypeError,
"can't use a string pattern on a bytes-like object");
goto err;
}
if (logical_charsize > 1 && pattern->logical_charsize == 1) {
PyErr_SetString(PyExc_TypeError,
"can't use a bytes pattern on a string-like object");
goto err;
}
/* adjust boundaries */
if (start < 0)
start = 0;
else if (start > length)
start = length;
if (end < 0)
end = 0;
else if (end > length)
end = length;
state->logical_charsize = logical_charsize;
state->charsize = charsize;
state->beginning = ptr;
state->start = (void*) ((char*) ptr + start * state->charsize);
state->end = (void*) ((char*) ptr + end * state->charsize);
Py_INCREF(string);
state->string = string;
state->pos = start;
state->endpos = end;
if (pattern->flags & SRE_FLAG_LOCALE)
state->lower = sre_lower_locale;
else if (pattern->flags & SRE_FLAG_UNICODE)
state->lower = sre_lower_unicode;
else
state->lower = sre_lower;
return string;
err:
if (state->buffer.buf)
PyBuffer_Release(&state->buffer);
return NULL;
}
LOCAL(void)
state_fini(SRE_STATE* state)
{
if (state->buffer.buf)
PyBuffer_Release(&state->buffer);
Py_XDECREF(state->string);
data_stack_dealloc(state);
}
/* calculate offset from start of string */
#define STATE_OFFSET(state, member)\
(((char*)(member) - (char*)(state)->beginning) / (state)->charsize)
LOCAL(PyObject*)
state_getslice(SRE_STATE* state, Py_ssize_t index, PyObject* string, int empty)
{
Py_ssize_t i, j;
index = (index - 1) * 2;
if (string == Py_None || index >= state->lastmark || !state->mark[index] || !state->mark[index+1]) {
if (empty)
/* want empty string */
i = j = 0;
else {
Py_INCREF(Py_None);
return Py_None;
}
} else {
i = STATE_OFFSET(state, state->mark[index]);
j = STATE_OFFSET(state, state->mark[index+1]);
}
return PySequence_GetSlice(string, i, j);
}
static void
pattern_error(int status)
{
switch (status) {
case SRE_ERROR_RECURSION_LIMIT:
PyErr_SetString(
PyExc_RuntimeError,
"maximum recursion limit exceeded"
);
break;
case SRE_ERROR_MEMORY:
PyErr_NoMemory();
break;
case SRE_ERROR_INTERRUPTED:
/* An exception has already been raised, so let it fly */
break;
default:
/* other error codes indicate compiler/engine bugs */
PyErr_SetString(
PyExc_RuntimeError,
"internal error in regular expression engine"
);
}
}
static void
pattern_dealloc(PatternObject* self)
{
if (self->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) self);
if (self->view.buf)
PyBuffer_Release(&self->view);
Py_XDECREF(self->pattern);
Py_XDECREF(self->groupindex);
Py_XDECREF(self->indexgroup);
PyObject_DEL(self);
}
static PyObject*
pattern_match(PatternObject* self, PyObject* args, PyObject* kw)
{
SRE_STATE state;
int status;
PyObject* string;
Py_ssize_t start = 0;
Py_ssize_t end = PY_SSIZE_T_MAX;
static char* kwlist[] = { "pattern", "pos", "endpos", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "O|nn:match", kwlist,
&string, &start, &end))
return NULL;
string = state_init(&state, self, string, start, end);
if (!string)
return NULL;
state.ptr = state.start;
TRACE(("|%p|%p|MATCH\n", PatternObject_GetCode(self), state.ptr));
if (state.logical_charsize == 1) {
status = sre_match(&state, PatternObject_GetCode(self));
} else {
status = sre_umatch(&state, PatternObject_GetCode(self));
}
TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
if (PyErr_Occurred())
return NULL;
state_fini(&state);
return pattern_new_match(self, &state, status);
}
static PyObject*
pattern_search(PatternObject* self, PyObject* args, PyObject* kw)
{
SRE_STATE state;
int status;
PyObject* string;
Py_ssize_t start = 0;
Py_ssize_t end = PY_SSIZE_T_MAX;
static char* kwlist[] = { "pattern", "pos", "endpos", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "O|nn:search", kwlist,
&string, &start, &end))
return NULL;
string = state_init(&state, self, string, start, end);
if (!string)
return NULL;
TRACE(("|%p|%p|SEARCH\n", PatternObject_GetCode(self), state.ptr));
if (state.logical_charsize == 1) {
status = sre_search(&state, PatternObject_GetCode(self));
} else {
status = sre_usearch(&state, PatternObject_GetCode(self));
}
TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
state_fini(&state);
if (PyErr_Occurred())
return NULL;
return pattern_new_match(self, &state, status);
}
static PyObject*
call(char* module, char* function, PyObject* args)
{
PyObject* name;
PyObject* mod;
PyObject* func;
PyObject* result;
if (!args)
return NULL;
name = PyUnicode_FromString(module);
if (!name)
return NULL;
mod = PyImport_Import(name);
Py_DECREF(name);
if (!mod)
return NULL;
func = PyObject_GetAttrString(mod, function);
Py_DECREF(mod);
if (!func)
return NULL;
result = PyObject_CallObject(func, args);
Py_DECREF(func);
Py_DECREF(args);
return result;
}
#ifdef USE_BUILTIN_COPY
static int
deepcopy(PyObject** object, PyObject* memo)
{
PyObject* copy;
copy = call(
"copy", "deepcopy",
PyTuple_Pack(2, *object, memo)
);
if (!copy)
return 0;
Py_DECREF(*object);
*object = copy;
return 1; /* success */
}
#endif
static PyObject*
join_list(PyObject* list, PyObject* string)
{
/* join list elements */
PyObject* joiner;
#if PY_VERSION_HEX >= 0x01060000
PyObject* function;
PyObject* args;
#endif
PyObject* result;
joiner = PySequence_GetSlice(string, 0, 0);
if (!joiner)
return NULL;
if (PyList_GET_SIZE(list) == 0) {
Py_DECREF(list);
return joiner;
}
#if PY_VERSION_HEX >= 0x01060000
function = PyObject_GetAttrString(joiner, "join");
if (!function) {
Py_DECREF(joiner);
return NULL;
}
args = PyTuple_New(1);
if (!args) {
Py_DECREF(function);
Py_DECREF(joiner);
return NULL;
}
PyTuple_SET_ITEM(args, 0, list);
result = PyObject_CallObject(function, args);
Py_DECREF(args); /* also removes list */
Py_DECREF(function);
#else
result = call(
"string", "join",
PyTuple_Pack(2, list, joiner)
);
#endif
Py_DECREF(joiner);
return result;
}
static PyObject*
pattern_findall(PatternObject* self, PyObject* args, PyObject* kw)
{
SRE_STATE state;
PyObject* list;
int status;
Py_ssize_t i, b, e;
PyObject* string;
Py_ssize_t start = 0;
Py_ssize_t end = PY_SSIZE_T_MAX;
static char* kwlist[] = { "source", "pos", "endpos", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "O|nn:findall", kwlist,
&string, &start, &end))
return NULL;
string = state_init(&state, self, string, start, end);
if (!string)
return NULL;
list = PyList_New(0);
if (!list) {
state_fini(&state);
return NULL;
}
while (state.start <= state.end) {
PyObject* item;
state_reset(&state);
state.ptr = state.start;
if (state.logical_charsize == 1) {
status = sre_search(&state, PatternObject_GetCode(self));
} else {
status = sre_usearch(&state, PatternObject_GetCode(self));
}
if (PyErr_Occurred())
goto error;
if (status <= 0) {
if (status == 0)
break;
pattern_error(status);
goto error;
}
/* don't bother to build a match object */
switch (self->groups) {
case 0:
b = STATE_OFFSET(&state, state.start);
e = STATE_OFFSET(&state, state.ptr);
item = PySequence_GetSlice(string, b, e);
if (!item)
goto error;
break;
case 1:
item = state_getslice(&state, 1, string, 1);
if (!item)
goto error;
break;
default:
item = PyTuple_New(self->groups);
if (!item)
goto error;
for (i = 0; i < self->groups; i++) {
PyObject* o = state_getslice(&state, i+1, string, 1);
if (!o) {
Py_DECREF(item);
goto error;
}
PyTuple_SET_ITEM(item, i, o);
}
break;
}
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
if (state.ptr == state.start)
state.start = (void*) ((char*) state.ptr + state.charsize);
else
state.start = state.ptr;
}
state_fini(&state);
return list;
error:
Py_DECREF(list);
state_fini(&state);
return NULL;
}
#if PY_VERSION_HEX >= 0x02020000
static PyObject*
pattern_finditer(PatternObject* pattern, PyObject* args, PyObject* kw)
{
PyObject* scanner;
PyObject* search;
PyObject* iterator;
scanner = pattern_scanner(pattern, args, kw);
if (!scanner)
return NULL;
search = PyObject_GetAttrString(scanner, "search");
Py_DECREF(scanner);
if (!search)
return NULL;
iterator = PyCallIter_New(search, Py_None);
Py_DECREF(search);
return iterator;
}
#endif
static PyObject*
pattern_split(PatternObject* self, PyObject* args, PyObject* kw)
{
SRE_STATE state;
PyObject* list;
PyObject* item;
int status;
Py_ssize_t n;
Py_ssize_t i;
void* last;
PyObject* string;
Py_ssize_t maxsplit = 0;
static char* kwlist[] = { "source", "maxsplit", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "O|n:split", kwlist,
&string, &maxsplit))
return NULL;
string = state_init(&state, self, string, 0, PY_SSIZE_T_MAX);
if (!string)
return NULL;
list = PyList_New(0);
if (!list) {
state_fini(&state);
return NULL;
}
n = 0;
last = state.start;
while (!maxsplit || n < maxsplit) {
state_reset(&state);
state.ptr = state.start;
if (state.logical_charsize == 1) {
status = sre_search(&state, PatternObject_GetCode(self));
} else {
status = sre_usearch(&state, PatternObject_GetCode(self));
}
if (PyErr_Occurred())
goto error;
if (status <= 0) {
if (status == 0)
break;
pattern_error(status);
goto error;
}
if (state.start == state.ptr) {
if (last == state.end)
break;
/* skip one character */
state.start = (void*) ((char*) state.ptr + state.charsize);
continue;
}
/* get segment before this match */
item = PySequence_GetSlice(
string, STATE_OFFSET(&state, last),
STATE_OFFSET(&state, state.start)
);
if (!item)
goto error;
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
/* add groups (if any) */
for (i = 0; i < self->groups; i++) {
item = state_getslice(&state, i+1, string, 0);
if (!item)
goto error;
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
}
n = n + 1;
last = state.start = state.ptr;
}
/* get segment following last match (even if empty) */
item = PySequence_GetSlice(
string, STATE_OFFSET(&state, last), state.endpos
);
if (!item)
goto error;
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
state_fini(&state);
return list;
error:
Py_DECREF(list);
state_fini(&state);
return NULL;
}
static PyObject*
pattern_subx(PatternObject* self, PyObject* ptemplate, PyObject* string,
Py_ssize_t count, Py_ssize_t subn)
{
SRE_STATE state;
PyObject* list;
PyObject* item;
PyObject* filter;
PyObject* args;
PyObject* match;
void* ptr;
int status;
Py_ssize_t n;
Py_ssize_t i, b, e;
int logical_charsize, charsize;
int filter_is_callable;
Py_buffer view;
if (PyCallable_Check(ptemplate)) {
/* sub/subn takes either a function or a template */
filter = ptemplate;
Py_INCREF(filter);
filter_is_callable = 1;
} else {
/* if not callable, check if it's a literal string */
int literal;
view.buf = NULL;
ptr = getstring(ptemplate, &n, &logical_charsize, &charsize, &view);
b = charsize;
if (ptr) {
literal = sre_literal_template(b, ptr, n);
} else {
PyErr_Clear();
literal = 0;
}
if (view.buf)
PyBuffer_Release(&view);
if (literal) {
filter = ptemplate;
Py_INCREF(filter);
filter_is_callable = 0;
} else {
/* not a literal; hand it over to the template compiler */
filter = call(
SRE_PY_MODULE, "_subx",
PyTuple_Pack(2, self, ptemplate)
);
if (!filter)
return NULL;
filter_is_callable = PyCallable_Check(filter);
}
}
string = state_init(&state, self, string, 0, PY_SSIZE_T_MAX);
if (!string) {
Py_DECREF(filter);
return NULL;
}
list = PyList_New(0);
if (!list) {
Py_DECREF(filter);
state_fini(&state);
return NULL;
}
n = i = 0;
while (!count || n < count) {
state_reset(&state);
state.ptr = state.start;
if (state.logical_charsize == 1) {
status = sre_search(&state, PatternObject_GetCode(self));
} else {
status = sre_usearch(&state, PatternObject_GetCode(self));
}
if (PyErr_Occurred())
goto error;
if (status <= 0) {
if (status == 0)
break;
pattern_error(status);
goto error;
}
b = STATE_OFFSET(&state, state.start);
e = STATE_OFFSET(&state, state.ptr);
if (i < b) {
/* get segment before this match */
item = PySequence_GetSlice(string, i, b);
if (!item)
goto error;
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
} else if (i == b && i == e && n > 0)
/* ignore empty match on latest position */
goto next;
if (filter_is_callable) {
/* pass match object through filter */
match = pattern_new_match(self, &state, 1);
if (!match)
goto error;
args = PyTuple_Pack(1, match);
if (!args) {
Py_DECREF(match);
goto error;
}
item = PyObject_CallObject(filter, args);
Py_DECREF(args);
Py_DECREF(match);
if (!item)
goto error;
} else {
/* filter is literal string */
item = filter;
Py_INCREF(item);
}
/* add to list */
if (item != Py_None) {
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
}
i = e;
n = n + 1;
next:
/* move on */
if (state.ptr == state.start)
state.start = (void*) ((char*) state.ptr + state.charsize);
else
state.start = state.ptr;
}
/* get segment following last match */
if (i < state.endpos) {
item = PySequence_GetSlice(string, i, state.endpos);
if (!item)
goto error;
status = PyList_Append(list, item);
Py_DECREF(item);
if (status < 0)
goto error;
}
state_fini(&state);
Py_DECREF(filter);
/* convert list to single string (also removes list) */
item = join_list(list, string);
if (!item)
return NULL;
if (subn)
return Py_BuildValue("Nn", item, n);
return item;
error:
Py_DECREF(list);
state_fini(&state);
Py_DECREF(filter);
return NULL;
}
static PyObject*
pattern_sub(PatternObject* self, PyObject* args, PyObject* kw)
{
PyObject* ptemplate;
PyObject* string;
Py_ssize_t count = 0;
static char* kwlist[] = { "repl", "string", "count", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|n:sub", kwlist,
&ptemplate, &string, &count))
return NULL;
return pattern_subx(self, ptemplate, string, count, 0);
}
static PyObject*
pattern_subn(PatternObject* self, PyObject* args, PyObject* kw)
{
PyObject* ptemplate;
PyObject* string;
Py_ssize_t count = 0;
static char* kwlist[] = { "repl", "string", "count", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|n:subn", kwlist,
&ptemplate, &string, &count))
return NULL;
return pattern_subx(self, ptemplate, string, count, 1);
}
static PyObject*
pattern_copy(PatternObject* self, PyObject *unused)
{
#ifdef USE_BUILTIN_COPY
PatternObject* copy;
int offset;
copy = PyObject_NEW_VAR(PatternObject, &Pattern_Type, self->codesize);
if (!copy)
return NULL;
offset = offsetof(PatternObject, groups);
Py_XINCREF(self->groupindex);
Py_XINCREF(self->indexgroup);
Py_XINCREF(self->pattern);
memcpy((char*) copy + offset, (char*) self + offset,
sizeof(PatternObject) + self->codesize * sizeof(SRE_CODE) - offset);
copy->weakreflist = NULL;
return (PyObject*) copy;
#else
PyErr_SetString(PyExc_TypeError, "cannot copy this pattern object");
return NULL;
#endif
}
static PyObject*
pattern_deepcopy(PatternObject* self, PyObject* memo)
{
#ifdef USE_BUILTIN_COPY
PatternObject* copy;
copy = (PatternObject*) pattern_copy(self);
if (!copy)
return NULL;
if (!deepcopy(&copy->groupindex, memo) ||
!deepcopy(&copy->indexgroup, memo) ||
!deepcopy(&copy->pattern, memo)) {
Py_DECREF(copy);
return NULL;
}
#else
PyErr_SetString(PyExc_TypeError, "cannot deepcopy this pattern object");
return NULL;
#endif
}
PyDoc_STRVAR(pattern_match_doc,
"match(string[, pos[, endpos]]) -> match object or None.\n\
Matches zero or more characters at the beginning of the string");
PyDoc_STRVAR(pattern_search_doc,
"search(string[, pos[, endpos]]) -> match object or None.\n\
Scan through string looking for a match, and return a corresponding\n\
match object instance. Return None if no position in the string matches.");
PyDoc_STRVAR(pattern_split_doc,
"split(string[, maxsplit = 0]) -> list.\n\
Split string by the occurrences of pattern.");
PyDoc_STRVAR(pattern_findall_doc,
"findall(string[, pos[, endpos]]) -> list.\n\
Return a list of all non-overlapping matches of pattern in string.");
PyDoc_STRVAR(pattern_finditer_doc,
"finditer(string[, pos[, endpos]]) -> iterator.\n\
Return an iterator over all non-overlapping matches for the \n\
RE pattern in string. For each match, the iterator returns a\n\
match object.");
PyDoc_STRVAR(pattern_sub_doc,
"sub(repl, string[, count = 0]) -> newstring.\n\
Return the string obtained by replacing the leftmost non-overlapping\n\
occurrences of pattern in string by the replacement repl.");
PyDoc_STRVAR(pattern_subn_doc,
"subn(repl, string[, count = 0]) -> (newstring, number of subs)\n\
Return the tuple (new_string, number_of_subs_made) found by replacing\n\
the leftmost non-overlapping occurrences of pattern with the\n\
replacement repl.");
PyDoc_STRVAR(pattern_doc, "Compiled regular expression objects");
static PyMethodDef pattern_methods[] = {
{"match", (PyCFunction) pattern_match, METH_VARARGS|METH_KEYWORDS,
pattern_match_doc},
{"search", (PyCFunction) pattern_search, METH_VARARGS|METH_KEYWORDS,
pattern_search_doc},
{"sub", (PyCFunction) pattern_sub, METH_VARARGS|METH_KEYWORDS,
pattern_sub_doc},
{"subn", (PyCFunction) pattern_subn, METH_VARARGS|METH_KEYWORDS,
pattern_subn_doc},
{"split", (PyCFunction) pattern_split, METH_VARARGS|METH_KEYWORDS,
pattern_split_doc},
{"findall", (PyCFunction) pattern_findall, METH_VARARGS|METH_KEYWORDS,
pattern_findall_doc},
#if PY_VERSION_HEX >= 0x02020000
{"finditer", (PyCFunction) pattern_finditer, METH_VARARGS|METH_KEYWORDS,
pattern_finditer_doc},
#endif
{"scanner", (PyCFunction) pattern_scanner, METH_VARARGS|METH_KEYWORDS},
{"__copy__", (PyCFunction) pattern_copy, METH_NOARGS},
{"__deepcopy__", (PyCFunction) pattern_deepcopy, METH_O},
{NULL, NULL}
};
#define PAT_OFF(x) offsetof(PatternObject, x)
static PyMemberDef pattern_members[] = {
{"pattern", T_OBJECT, PAT_OFF(pattern), READONLY},
{"flags", T_INT, PAT_OFF(flags), READONLY},
{"groups", T_PYSSIZET, PAT_OFF(groups), READONLY},
{"groupindex", T_OBJECT, PAT_OFF(groupindex), READONLY},
{NULL} /* Sentinel */
};
static PyTypeObject Pattern_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_" SRE_MODULE ".SRE_Pattern",
sizeof(PatternObject), sizeof(SRE_CODE),
(destructor)pattern_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
pattern_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
offsetof(PatternObject, weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
pattern_methods, /* tp_methods */
pattern_members, /* tp_members */
};
static int _validate(PatternObject *self); /* Forward */
static PyObject *
_compile(PyObject* self_, PyObject* args)
{
/* "compile" pattern descriptor to pattern object */
PatternObject* self;
Py_ssize_t i, n;
PyObject* pattern;
int flags = 0;
PyObject* code;
Py_ssize_t groups = 0;
PyObject* groupindex = NULL;
PyObject* indexgroup = NULL;
if (!PyArg_ParseTuple(args, "OiO!|nOO", &pattern, &flags,
&PyList_Type, &code, &groups,
&groupindex, &indexgroup))
return NULL;
n = PyList_GET_SIZE(code);
/* coverity[ampersand_in_size] */
self = PyObject_NEW_VAR(PatternObject, &Pattern_Type, n);
if (!self)
return NULL;
self->weakreflist = NULL;
self->pattern = NULL;
self->groupindex = NULL;
self->indexgroup = NULL;
self->view.buf = NULL;
self->codesize = n;
for (i = 0; i < n; i++) {
PyObject *o = PyList_GET_ITEM(code, i);
unsigned long value = PyLong_AsUnsignedLong(o);
self->code[i] = (SRE_CODE) value;
if ((unsigned long) self->code[i] != value) {
PyErr_SetString(PyExc_OverflowError,
"regular expression code size limit exceeded");
break;
}
}
if (PyErr_Occurred()) {
Py_DECREF(self);
return NULL;
}
if (pattern == Py_None) {
self->logical_charsize = -1;
self->charsize = -1;
}
else {
Py_ssize_t p_length;
if (!getstring(pattern, &p_length, &self->logical_charsize,
&self->charsize, &self->view)) {
Py_DECREF(self);
return NULL;
}
}
Py_INCREF(pattern);
self->pattern = pattern;
self->flags = flags;
self->groups = groups;
Py_XINCREF(groupindex);
self->groupindex = groupindex;
Py_XINCREF(indexgroup);
self->indexgroup = indexgroup;
self->weakreflist = NULL;
if (!_validate(self)) {
Py_DECREF(self);
return NULL;
}
return (PyObject*) self;
}
/* -------------------------------------------------------------------- */
/* Code validation */
/* To learn more about this code, have a look at the _compile() function in
Lib/sre_compile.py. The validation functions below checks the code array
for conformance with the code patterns generated there.
The nice thing about the generated code is that it is position-independent:
all jumps are relative jumps forward. Also, jumps don't cross each other:
the target of a later jump is always earlier than the target of an earlier
jump. IOW, this is okay:
J---------J-------T--------T
\ \_____/ /
\______________________/
but this is not:
J---------J-------T--------T
\_________\_____/ /
\____________/
It also helps that SRE_CODE is always an unsigned type, either 2 bytes or 4
bytes wide (the latter if Python is compiled for "wide" unicode support).
*/
/* Defining this one enables tracing of the validator */
#undef VVERBOSE
/* Trace macro for the validator */
#if defined(VVERBOSE)
#define VTRACE(v) printf v
#else
#define VTRACE(v) do {} while(0) /* do nothing */
#endif
/* Report failure */
#define FAIL do { VTRACE(("FAIL: %d\n", __LINE__)); return 0; } while (0)
/* Extract opcode, argument, or skip count from code array */
#define GET_OP \
do { \
VTRACE(("%p: ", code)); \
if (code >= end) FAIL; \
op = *code++; \
VTRACE(("%lu (op)\n", (unsigned long)op)); \
} while (0)
#define GET_ARG \
do { \
VTRACE(("%p= ", code)); \
if (code >= end) FAIL; \
arg = *code++; \
VTRACE(("%lu (arg)\n", (unsigned long)arg)); \
} while (0)
#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-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)
{
/* Some variables are manipulated by the macros above */
SRE_CODE op;
SRE_CODE arg;
SRE_CODE offset;
int i;
while (code < end) {
GET_OP;
switch (op) {
case SRE_OP_NEGATE:
break;
case SRE_OP_LITERAL:
GET_ARG;
break;
case SRE_OP_RANGE:
GET_ARG;
GET_ARG;
break;
case SRE_OP_CHARSET:
offset = 32/sizeof(SRE_CODE); /* 32-byte bitmap */
if (code+offset < code || code+offset > end)
FAIL;
code += offset;
break;
case SRE_OP_BIGCHARSET:
GET_ARG; /* Number of blocks */
offset = 256/sizeof(SRE_CODE); /* 256-byte table */
if (code+offset < code || code+offset > end)
FAIL;
/* Make sure that each byte points to a valid block */
for (i = 0; i < 256; i++) {
if (((unsigned char *)code)[i] >= arg)
FAIL;
}
code += offset;
offset = arg * 32/sizeof(SRE_CODE); /* 32-byte bitmap times arg */
if (code+offset < code || code+offset > end)
FAIL;
code += offset;
break;
case SRE_OP_CATEGORY:
GET_ARG;
switch (arg) {
case SRE_CATEGORY_DIGIT:
case SRE_CATEGORY_NOT_DIGIT:
case SRE_CATEGORY_SPACE:
case SRE_CATEGORY_NOT_SPACE:
case SRE_CATEGORY_WORD:
case SRE_CATEGORY_NOT_WORD:
case SRE_CATEGORY_LINEBREAK:
case SRE_CATEGORY_NOT_LINEBREAK:
case SRE_CATEGORY_LOC_WORD:
case SRE_CATEGORY_LOC_NOT_WORD:
case SRE_CATEGORY_UNI_DIGIT:
case SRE_CATEGORY_UNI_NOT_DIGIT:
case SRE_CATEGORY_UNI_SPACE:
case SRE_CATEGORY_UNI_NOT_SPACE:
case SRE_CATEGORY_UNI_WORD:
case SRE_CATEGORY_UNI_NOT_WORD:
case SRE_CATEGORY_UNI_LINEBREAK:
case SRE_CATEGORY_UNI_NOT_LINEBREAK:
break;
default:
FAIL;
}
break;
default:
FAIL;
}
}
return 1;
}
static int
_validate_inner(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
{
/* Some variables are manipulated by the macros above */
SRE_CODE op;
SRE_CODE arg;
SRE_CODE skip;
VTRACE(("code=%p, end=%p\n", code, end));
if (code > end)
FAIL;
while (code < end) {
GET_OP;
switch (op) {
case SRE_OP_MARK:
/* We don't check whether marks are properly nested; the
sre_match() code is robust even if they don't, and the worst
you can get is nonsensical match results. */
GET_ARG;
if (arg > 2*groups+1) {
VTRACE(("arg=%d, groups=%d\n", (int)arg, (int)groups));
FAIL;
}
break;
case SRE_OP_LITERAL:
case SRE_OP_NOT_LITERAL:
case SRE_OP_LITERAL_IGNORE:
case SRE_OP_NOT_LITERAL_IGNORE:
GET_ARG;
/* The arg is just a character, nothing to check */
break;
case SRE_OP_SUCCESS:
case SRE_OP_FAILURE:
/* Nothing to check; these normally end the matching process */
break;
case SRE_OP_AT:
GET_ARG;
switch (arg) {
case SRE_AT_BEGINNING:
case SRE_AT_BEGINNING_STRING:
case SRE_AT_BEGINNING_LINE:
case SRE_AT_END:
case SRE_AT_END_LINE:
case SRE_AT_END_STRING:
case SRE_AT_BOUNDARY:
case SRE_AT_NON_BOUNDARY:
case SRE_AT_LOC_BOUNDARY:
case SRE_AT_LOC_NON_BOUNDARY:
case SRE_AT_UNI_BOUNDARY:
case SRE_AT_UNI_NON_BOUNDARY:
break;
default:
FAIL;
}
break;
case SRE_OP_ANY:
case SRE_OP_ANY_ALL:
/* These have no operands */
break;
case SRE_OP_IN:
case SRE_OP_IN_IGNORE:
GET_SKIP;
/* Stop 1 before the end; we check the FAILURE below */
if (!_validate_charset(code, code+skip-2))
FAIL;
if (code[skip-2] != SRE_OP_FAILURE)
FAIL;
code += skip-1;
break;
case SRE_OP_INFO:
{
/* A minimal info field is
<INFO> <1=skip> <2=flags> <3=min> <4=max>;
If SRE_INFO_PREFIX or SRE_INFO_CHARSET is in the flags,
more follows. */
SRE_CODE flags, i;
SRE_CODE *newcode;
GET_SKIP;
newcode = code+skip-1;
GET_ARG; flags = arg;
GET_ARG;
GET_ARG;
/* Check that only valid flags are present */
if ((flags & ~(SRE_INFO_PREFIX |
SRE_INFO_LITERAL |
SRE_INFO_CHARSET)) != 0)
FAIL;
/* PREFIX and CHARSET are mutually exclusive */
if ((flags & SRE_INFO_PREFIX) &&
(flags & SRE_INFO_CHARSET))
FAIL;
/* LITERAL implies PREFIX */
if ((flags & SRE_INFO_LITERAL) &&
!(flags & SRE_INFO_PREFIX))
FAIL;
/* Validate the prefix */
if (flags & SRE_INFO_PREFIX) {
SRE_CODE prefix_len;
GET_ARG; prefix_len = arg;
GET_ARG;
/* Here comes the prefix string */
if (code+prefix_len < code || code+prefix_len > newcode)
FAIL;
code += prefix_len;
/* And here comes the overlap table */
if (code+prefix_len < code || code+prefix_len > newcode)
FAIL;
/* Each overlap value should be < prefix_len */
for (i = 0; i < prefix_len; i++) {
if (code[i] >= prefix_len)
FAIL;
}
code += prefix_len;
}
/* Validate the charset */
if (flags & SRE_INFO_CHARSET) {
if (!_validate_charset(code, newcode-1))
FAIL;
if (newcode[-1] != SRE_OP_FAILURE)
FAIL;
code = newcode;
}
else if (code != newcode) {
VTRACE(("code=%p, newcode=%p\n", code, newcode));
FAIL;
}
}
break;
case SRE_OP_BRANCH:
{
SRE_CODE *target = NULL;
for (;;) {
GET_SKIP;
if (skip == 0)
break;
/* Stop 2 before the end; we check the JUMP below */
if (!_validate_inner(code, code+skip-3, groups))
FAIL;
code += skip-3;
/* Check that it ends with a JUMP, and that each JUMP
has the same target */
GET_OP;
if (op != SRE_OP_JUMP)
FAIL;
GET_SKIP;
if (target == NULL)
target = code+skip-1;
else if (code+skip-1 != target)
FAIL;
}
}
break;
case SRE_OP_REPEAT_ONE:
case SRE_OP_MIN_REPEAT_ONE:
{
SRE_CODE min, max;
GET_SKIP;
GET_ARG; min = arg;
GET_ARG; max = arg;
if (min > max)
FAIL;
if (max > 65535)
FAIL;
if (!_validate_inner(code, code+skip-4, groups))
FAIL;
code += skip-4;
GET_OP;
if (op != SRE_OP_SUCCESS)
FAIL;
}
break;
case SRE_OP_REPEAT:
{
SRE_CODE min, max;
GET_SKIP;
GET_ARG; min = arg;
GET_ARG; max = arg;
if (min > max)
FAIL;
if (max > 65535)
FAIL;
if (!_validate_inner(code, code+skip-3, groups))
FAIL;
code += skip-3;
GET_OP;
if (op != SRE_OP_MAX_UNTIL && op != SRE_OP_MIN_UNTIL)
FAIL;
}
break;
case SRE_OP_GROUPREF:
case SRE_OP_GROUPREF_IGNORE:
GET_ARG;
if (arg >= groups)
FAIL;
break;
case SRE_OP_GROUPREF_EXISTS:
/* The regex syntax for this is: '(?(group)then|else)', where
'group' is either an integer group number or a group name,
'then' and 'else' are sub-regexes, and 'else' is optional. */
GET_ARG;
if (arg >= groups)
FAIL;
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:
GROUPREF_EXISTS
<group>
<skipyes>
...then part...
JUMP
<skipno>
(<skipyes> jumps here)
...else part...
(<skipno> jumps here)
If there is only a 'then' part, it looks like:
GROUPREF_EXISTS
<group>
<skip>
...then part...
(<skip> jumps here)
There is no direct way to decide which it is, and we don't want
to allow arbitrary jumps anywhere in the code; so we just look
for a JUMP opcode preceding our skip target.
*/
if (skip >= 3 && code+skip-3 >= code &&
code[skip-3] == SRE_OP_JUMP)
{
VTRACE(("both then and else parts present\n"));
if (!_validate_inner(code+1, code+skip-3, groups))
FAIL;
code += skip-2; /* Position after JUMP, at <skipno> */
GET_SKIP;
if (!_validate_inner(code, code+skip-1, groups))
FAIL;
code += skip-1;
}
else {
VTRACE(("only a then part present\n"));
if (!_validate_inner(code+1, code+skip-1, groups))
FAIL;
code += skip-1;
}
break;
case SRE_OP_ASSERT:
case SRE_OP_ASSERT_NOT:
GET_SKIP;
GET_ARG; /* 0 for lookahead, width for lookbehind */
code--; /* Back up over arg to simplify math below */
if (arg & 0x80000000)
FAIL; /* Width too large */
/* Stop 1 before the end; we check the SUCCESS below */
if (!_validate_inner(code+1, code+skip-2, groups))
FAIL;
code += skip-2;
GET_OP;
if (op != SRE_OP_SUCCESS)
FAIL;
break;
default:
FAIL;
}
}
VTRACE(("okay\n"));
return 1;
}
static int
_validate_outer(SRE_CODE *code, SRE_CODE *end, Py_ssize_t groups)
{
if (groups < 0 || groups > 100 || code >= end || end[-1] != SRE_OP_SUCCESS)
FAIL;
if (groups == 0) /* fix for simplejson */
groups = 100; /* 100 groups should always be safe */
return _validate_inner(code, end-1, groups);
}
static int
_validate(PatternObject *self)
{
if (!_validate_outer(self->code, self->code+self->codesize, self->groups))
{
PyErr_SetString(PyExc_RuntimeError, "invalid SRE code");
return 0;
}
else
VTRACE(("Success!\n"));
return 1;
}
/* -------------------------------------------------------------------- */
/* match methods */
static void
match_dealloc(MatchObject* self)
{
Py_XDECREF(self->regs);
Py_XDECREF(self->string);
Py_DECREF(self->pattern);
PyObject_DEL(self);
}
static PyObject*
match_getslice_by_index(MatchObject* self, Py_ssize_t index, PyObject* def)
{
if (index < 0 || index >= self->groups) {
/* raise IndexError if we were given a bad group number */
PyErr_SetString(
PyExc_IndexError,
"no such group"
);
return NULL;
}
index *= 2;
if (self->string == Py_None || self->mark[index] < 0) {
/* return default value if the string or group is undefined */
Py_INCREF(def);
return def;
}
return PySequence_GetSlice(
self->string, self->mark[index], self->mark[index+1]
);
}
static Py_ssize_t
match_getindex(MatchObject* self, PyObject* index)
{
Py_ssize_t i;
if (index == NULL)
/* Default value */
return 0;
if (PyLong_Check(index))
return PyLong_AsSsize_t(index);
i = -1;
if (self->pattern->groupindex) {
index = PyObject_GetItem(self->pattern->groupindex, index);
if (index) {
if (PyLong_Check(index))
i = PyLong_AsSsize_t(index);
Py_DECREF(index);
} else
PyErr_Clear();
}
return i;
}
static PyObject*
match_getslice(MatchObject* self, PyObject* index, PyObject* def)
{
return match_getslice_by_index(self, match_getindex(self, index), def);
}
static PyObject*
match_expand(MatchObject* self, PyObject* ptemplate)
{
/* delegate to Python code */
return call(
SRE_PY_MODULE, "_expand",
PyTuple_Pack(3, self->pattern, self, ptemplate)
);
}
static PyObject*
match_group(MatchObject* self, PyObject* args)
{
PyObject* result;
Py_ssize_t i, size;
size = PyTuple_GET_SIZE(args);
switch (size) {
case 0:
result = match_getslice(self, Py_False, Py_None);
break;
case 1:
result = match_getslice(self, PyTuple_GET_ITEM(args, 0), Py_None);
break;
default:
/* fetch multiple items */
result = PyTuple_New(size);
if (!result)
return NULL;
for (i = 0; i < size; i++) {
PyObject* item = match_getslice(
self, PyTuple_GET_ITEM(args, i), Py_None
);
if (!item) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, item);
}
break;
}
return result;
}
static PyObject*
match_groups(MatchObject* self, PyObject* args, PyObject* kw)
{
PyObject* result;
Py_ssize_t index;
PyObject* def = Py_None;
static char* kwlist[] = { "default", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "|O:groups", kwlist, &def))
return NULL;
result = PyTuple_New(self->groups-1);
if (!result)
return NULL;
for (index = 1; index < self->groups; index++) {
PyObject* item;
item = match_getslice_by_index(self, index, def);
if (!item) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, index-1, item);
}
return result;
}
static PyObject*
match_groupdict(MatchObject* self, PyObject* args, PyObject* kw)
{
PyObject* result;
PyObject* keys;
Py_ssize_t index;
PyObject* def = Py_None;
static char* kwlist[] = { "default", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "|O:groupdict", kwlist, &def))
return NULL;
result = PyDict_New();
if (!result || !self->pattern->groupindex)
return result;
keys = PyMapping_Keys(self->pattern->groupindex);
if (!keys)
goto failed;
for (index = 0; index < PyList_GET_SIZE(keys); index++) {
int status;
PyObject* key;
PyObject* value;
key = PyList_GET_ITEM(keys, index);
if (!key)
goto failed;
value = match_getslice(self, key, def);
if (!value) {
Py_DECREF(key);
goto failed;
}
status = PyDict_SetItem(result, key, value);
Py_DECREF(value);
if (status < 0)
goto failed;
}
Py_DECREF(keys);
return result;
failed:
Py_XDECREF(keys);
Py_DECREF(result);
return NULL;
}
static PyObject*
match_start(MatchObject* self, PyObject* args)
{
Py_ssize_t index;
PyObject* index_ = NULL;
if (!PyArg_UnpackTuple(args, "start", 0, 1, &index_))
return NULL;
index = match_getindex(self, index_);
if (index < 0 || index >= self->groups) {
PyErr_SetString(
PyExc_IndexError,
"no such group"
);
return NULL;
}
/* mark is -1 if group is undefined */
return PyLong_FromSsize_t(self->mark[index*2]);
}
static PyObject*
match_end(MatchObject* self, PyObject* args)
{
Py_ssize_t index;
PyObject* index_ = NULL;
if (!PyArg_UnpackTuple(args, "end", 0, 1, &index_))
return NULL;
index = match_getindex(self, index_);
if (index < 0 || index >= self->groups) {
PyErr_SetString(
PyExc_IndexError,
"no such group"
);
return NULL;
}
/* mark is -1 if group is undefined */
return PyLong_FromSsize_t(self->mark[index*2+1]);
}
LOCAL(PyObject*)
_pair(Py_ssize_t i1, Py_ssize_t i2)
{
PyObject* pair;
PyObject* item;
pair = PyTuple_New(2);
if (!pair)
return NULL;
item = PyLong_FromSsize_t(i1);
if (!item)
goto error;
PyTuple_SET_ITEM(pair, 0, item);
item = PyLong_FromSsize_t(i2);
if (!item)
goto error;
PyTuple_SET_ITEM(pair, 1, item);
return pair;
error:
Py_DECREF(pair);
return NULL;
}
static PyObject*
match_span(MatchObject* self, PyObject* args)
{
Py_ssize_t index;
PyObject* index_ = NULL;
if (!PyArg_UnpackTuple(args, "span", 0, 1, &index_))
return NULL;
index = match_getindex(self, index_);
if (index < 0 || index >= self->groups) {
PyErr_SetString(
PyExc_IndexError,
"no such group"
);
return NULL;
}
/* marks are -1 if group is undefined */
return _pair(self->mark[index*2], self->mark[index*2+1]);
}
static PyObject*
match_regs(MatchObject* self)
{
PyObject* regs;
PyObject* item;
Py_ssize_t index;
regs = PyTuple_New(self->groups);
if (!regs)
return NULL;
for (index = 0; index < self->groups; index++) {
item = _pair(self->mark[index*2], self->mark[index*2+1]);
if (!item) {
Py_DECREF(regs);
return NULL;
}
PyTuple_SET_ITEM(regs, index, item);
}
Py_INCREF(regs);
self->regs = regs;
return regs;
}
static PyObject*
match_copy(MatchObject* self, PyObject *unused)
{
#ifdef USE_BUILTIN_COPY
MatchObject* copy;
Py_ssize_t slots, offset;
slots = 2 * (self->pattern->groups+1);
copy = PyObject_NEW_VAR(MatchObject, &Match_Type, slots);
if (!copy)
return NULL;
/* this value a constant, but any compiler should be able to
figure that out all by itself */
offset = offsetof(MatchObject, string);
Py_XINCREF(self->pattern);
Py_XINCREF(self->string);
Py_XINCREF(self->regs);
memcpy((char*) copy + offset, (char*) self + offset,
sizeof(MatchObject) + slots * sizeof(Py_ssize_t) - offset);
return (PyObject*) copy;
#else
PyErr_SetString(PyExc_TypeError, "cannot copy this match object");
return NULL;
#endif
}
static PyObject*
match_deepcopy(MatchObject* self, PyObject* memo)
{
#ifdef USE_BUILTIN_COPY
MatchObject* copy;
copy = (MatchObject*) match_copy(self);
if (!copy)
return NULL;
if (!deepcopy((PyObject**) &copy->pattern, memo) ||
!deepcopy(&copy->string, memo) ||
!deepcopy(&copy->regs, memo)) {
Py_DECREF(copy);
return NULL;
}
#else
PyErr_SetString(PyExc_TypeError, "cannot deepcopy this match object");
return NULL;
#endif
}
PyDoc_STRVAR(match_doc,
"The result of re.match() and re.search().\n\
Match objects always have a boolean value of True.");
PyDoc_STRVAR(match_group_doc,
"group([group1, ...]) -> str or tuple.\n\
Return subgroup(s) of the match by indices or names.\n\
For 0 returns the entire match.");
PyDoc_STRVAR(match_start_doc,
"start([group=0]) -> int.\n\
Return index of the start of the substring matched by group.");
PyDoc_STRVAR(match_end_doc,
"end([group=0]) -> int.\n\
Return index of the end of the substring matched by group.");
PyDoc_STRVAR(match_span_doc,
"span([group]) -> tuple.\n\
For MatchObject m, return the 2-tuple (m.start(group), m.end(group)).");
PyDoc_STRVAR(match_groups_doc,
"groups([default=None]) -> tuple.\n\
Return a tuple containing all the subgroups of the match, from 1.\n\
The default argument is used for groups\n\
that did not participate in the match");
PyDoc_STRVAR(match_groupdict_doc,
"groupdict([default=None]) -> dict.\n\
Return a dictionary containing all the named subgroups of the match,\n\
keyed by the subgroup name. The default argument is used for groups\n\
that did not participate in the match");
PyDoc_STRVAR(match_expand_doc,
"expand(template) -> str.\n\
Return the string obtained by doing backslash substitution\n\
on the string template, as done by the sub() method.");
static PyMethodDef match_methods[] = {
{"group", (PyCFunction) match_group, METH_VARARGS, match_group_doc},
{"start", (PyCFunction) match_start, METH_VARARGS, match_start_doc},
{"end", (PyCFunction) match_end, METH_VARARGS, match_end_doc},
{"span", (PyCFunction) match_span, METH_VARARGS, match_span_doc},
{"groups", (PyCFunction) match_groups, METH_VARARGS|METH_KEYWORDS,
match_groups_doc},
{"groupdict", (PyCFunction) match_groupdict, METH_VARARGS|METH_KEYWORDS,
match_groupdict_doc},
{"expand", (PyCFunction) match_expand, METH_O, match_expand_doc},
{"__copy__", (PyCFunction) match_copy, METH_NOARGS},
{"__deepcopy__", (PyCFunction) match_deepcopy, METH_O},
{NULL, NULL}
};
static PyObject *
match_lastindex_get(MatchObject *self)
{
if (self->lastindex >= 0)
return PyLong_FromSsize_t(self->lastindex);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
match_lastgroup_get(MatchObject *self)
{
if (self->pattern->indexgroup && self->lastindex >= 0) {
PyObject* result = PySequence_GetItem(
self->pattern->indexgroup, self->lastindex
);
if (result)
return result;
PyErr_Clear();
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
match_regs_get(MatchObject *self)
{
if (self->regs) {
Py_INCREF(self->regs);
return self->regs;
} else
return match_regs(self);
}
static PyGetSetDef match_getset[] = {
{"lastindex", (getter)match_lastindex_get, (setter)NULL},
{"lastgroup", (getter)match_lastgroup_get, (setter)NULL},
{"regs", (getter)match_regs_get, (setter)NULL},
{NULL}
};
#define MATCH_OFF(x) offsetof(MatchObject, x)
static PyMemberDef match_members[] = {
{"string", T_OBJECT, MATCH_OFF(string), READONLY},
{"re", T_OBJECT, MATCH_OFF(pattern), READONLY},
{"pos", T_PYSSIZET, MATCH_OFF(pos), READONLY},
{"endpos", T_PYSSIZET, MATCH_OFF(endpos), READONLY},
{NULL}
};
/* FIXME: implement setattr("string", None) as a special case (to
detach the associated string, if any */
static PyTypeObject Match_Type = {
PyVarObject_HEAD_INIT(NULL,0)
"_" SRE_MODULE ".SRE_Match",
sizeof(MatchObject), sizeof(Py_ssize_t),
(destructor)match_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
match_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
match_methods, /* tp_methods */
match_members, /* tp_members */
match_getset, /* tp_getset */
};
static PyObject*
pattern_new_match(PatternObject* pattern, SRE_STATE* state, int status)
{
/* create match object (from state object) */
MatchObject* match;
Py_ssize_t i, j;
char* base;
int n;
if (status > 0) {
/* create match object (with room for extra group marks) */
/* coverity[ampersand_in_size] */
match = PyObject_NEW_VAR(MatchObject, &Match_Type,
2*(pattern->groups+1));
if (!match)
return NULL;
Py_INCREF(pattern);
match->pattern = pattern;
Py_INCREF(state->string);
match->string = state->string;
match->regs = NULL;
match->groups = pattern->groups+1;
/* fill in group slices */
base = (char*) state->beginning;
n = state->charsize;
match->mark[0] = ((char*) state->start - base) / n;
match->mark[1] = ((char*) state->ptr - base) / n;
for (i = j = 0; i < pattern->groups; i++, j+=2)
if (j+1 <= state->lastmark && state->mark[j] && state->mark[j+1]) {
match->mark[j+2] = ((char*) state->mark[j] - base) / n;
match->mark[j+3] = ((char*) state->mark[j+1] - base) / n;
} else
match->mark[j+2] = match->mark[j+3] = -1; /* undefined */
match->pos = state->pos;
match->endpos = state->endpos;
match->lastindex = state->lastindex;
return (PyObject*) match;
} else if (status == 0) {
/* no match */
Py_INCREF(Py_None);
return Py_None;
}
/* internal error */
pattern_error(status);
return NULL;
}
/* -------------------------------------------------------------------- */
/* scanner methods (experimental) */
static void
scanner_dealloc(ScannerObject* self)
{
state_fini(&self->state);
Py_XDECREF(self->pattern);
PyObject_DEL(self);
}
static PyObject*
scanner_match(ScannerObject* self, PyObject *unused)
{
SRE_STATE* state = &self->state;
PyObject* match;
int status;
state_reset(state);
state->ptr = state->start;
if (state->logical_charsize == 1) {
status = sre_match(state, PatternObject_GetCode(self->pattern));
} else {
status = sre_umatch(state, PatternObject_GetCode(self->pattern));
}
if (PyErr_Occurred())
return NULL;
match = pattern_new_match((PatternObject*) self->pattern,
state, status);
if (status == 0 || state->ptr == state->start)
state->start = (void*) ((char*) state->ptr + state->charsize);
else
state->start = state->ptr;
return match;
}
static PyObject*
scanner_search(ScannerObject* self, PyObject *unused)
{
SRE_STATE* state = &self->state;
PyObject* match;
int status;
state_reset(state);
state->ptr = state->start;
if (state->logical_charsize == 1) {
status = sre_search(state, PatternObject_GetCode(self->pattern));
} else {
status = sre_usearch(state, PatternObject_GetCode(self->pattern));
}
if (PyErr_Occurred())
return NULL;
match = pattern_new_match((PatternObject*) self->pattern,
state, status);
if (status == 0 || state->ptr == state->start)
state->start = (void*) ((char*) state->ptr + state->charsize);
else
state->start = state->ptr;
return match;
}
static PyMethodDef scanner_methods[] = {
{"match", (PyCFunction) scanner_match, METH_NOARGS},
{"search", (PyCFunction) scanner_search, METH_NOARGS},
{NULL, NULL}
};
#define SCAN_OFF(x) offsetof(ScannerObject, x)
static PyMemberDef scanner_members[] = {
{"pattern", T_OBJECT, SCAN_OFF(pattern), READONLY},
{NULL} /* Sentinel */
};
static PyTypeObject Scanner_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_" SRE_MODULE ".SRE_Scanner",
sizeof(ScannerObject), 0,
(destructor)scanner_dealloc,/* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
scanner_methods, /* tp_methods */
scanner_members, /* tp_members */
0, /* tp_getset */
};
static PyObject*
pattern_scanner(PatternObject* pattern, PyObject* args, PyObject* kw)
{
/* create search state object */
ScannerObject* self;
PyObject* string;
Py_ssize_t start = 0;
Py_ssize_t end = PY_SSIZE_T_MAX;
static char* kwlist[] = { "source", "pos", "endpos", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kw, "O|nn:scanner", kwlist,
&string, &start, &end))
return NULL;
/* create scanner object */
self = PyObject_NEW(ScannerObject, &Scanner_Type);
if (!self)
return NULL;
self->pattern = NULL;
string = state_init(&self->state, pattern, string, start, end);
if (!string) {
Py_DECREF(self);
return NULL;
}
Py_INCREF(pattern);
self->pattern = (PyObject*) pattern;
return (PyObject*) self;
}
static PyMethodDef _functions[] = {
{"compile", _compile, METH_VARARGS},
{"getcodesize", sre_codesize, METH_NOARGS},
{"getlower", sre_getlower, METH_VARARGS},
{NULL, NULL}
};
static struct PyModuleDef sremodule = {
PyModuleDef_HEAD_INIT,
"_" SRE_MODULE,
NULL,
-1,
_functions,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC PyInit__sre(void)
{
PyObject* m;
PyObject* d;
PyObject* x;
/* Patch object types */
if (PyType_Ready(&Pattern_Type) || PyType_Ready(&Match_Type) ||
PyType_Ready(&Scanner_Type))
return NULL;
m = PyModule_Create(&sremodule);
if (m == NULL)
return NULL;
d = PyModule_GetDict(m);
x = PyLong_FromLong(SRE_MAGIC);
if (x) {
PyDict_SetItemString(d, "MAGIC", x);
Py_DECREF(x);
}
x = PyLong_FromLong(sizeof(SRE_CODE));
if (x) {
PyDict_SetItemString(d, "CODESIZE", x);
Py_DECREF(x);
}
x = PyUnicode_FromString(copyright);
if (x) {
PyDict_SetItemString(d, "copyright", x);
Py_DECREF(x);
}
return m;
}
#endif /* !defined(SRE_RECURSIVE) */
/* vim:ts=4:sw=4:et
*/
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