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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 (0.5)
- * 2000-06-30 fl added fast search optimization (0.9.3)
- * 2000-06-30 fl added assert (lookahead) primitives, etc (0.9.4)
- * 2000-07-02 fl added charset optimizations, etc (0.9.5)
- * 2000-07-03 fl store code in pattern object, lookbehind, etc
- * 2000-07-08 fl added regs attribute
- * 2000-07-21 fl reset lastindex in scanner methods (0.9.6)
- * 2000-08-01 fl fixes for 1.6b1 (0.9.8)
- * 2000-08-03 fl added recursion limit
- * 2000-08-07 fl use PyOS_CheckStack() if available
- * 2000-08-08 fl changed findall to return empty strings instead of None
- * 2000-08-27 fl properly propagate memory errors
- * 2000-09-02 fl return -1 instead of None for start/end/span
- * 2000-09-20 fl added expand method
- * 2000-09-21 fl don't use the buffer interface for unicode strings
- * 2000-10-03 fl fixed assert_not primitive; support keyword arguments
- *
- * Copyright (c) 1997-2000 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
-
- char copyright[] = " SRE 0.9.8 Copyright (c) 1997-2000 by Secret Labs AB ";
-
- #include "Python.h"
-
- #include "sre.h"
-
- #include <ctype.h>
-
- /* name of this module, minus the leading underscore */
- #define MODULE "sre"
-
- /* defining this one enables tracing */
- #undef VERBOSE
-
- #if PY_VERSION_HEX >= 0x01060000
- /* defining this enables unicode support (default under 1.6a1 and later) */
- #define HAVE_UNICODE
- #endif
-
- /* -------------------------------------------------------------------- */
- /* optional features */
-
- /* prevent run-away recursion (bad patterns on long strings) */
-
- #if !defined(USE_STACKCHECK)
- #if defined(MS_WIN64) || defined(__LP64__) || defined(_LP64)
- /* require smaller recursion limit for a number of 64-bit platforms:
- Win64 (MS_WIN64), Linux64 (__LP64__), Monterey (64-bit AIX) (_LP64) */
- /* FIXME: maybe the limit should be 40000 / sizeof(void*) ? */
- #define USE_RECURSION_LIMIT 7500
- #else
- #define USE_RECURSION_LIMIT 10000
- #endif
- #endif
-
- /* enables fast searching */
- #define USE_FAST_SEARCH
-
- /* enables aggressive inlining (always on for Visual C) */
- #undef USE_INLINE
-
- /* -------------------------------------------------------------------- */
-
- #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 */
-
- #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
-
- 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 };
-
- static unsigned int sre_lower(unsigned int ch)
- {
- return ((ch) < 128 ? sre_char_lower[ch] : ch);
- }
-
- #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)
-
- /* locale-specific character predicates */
-
- static unsigned int sre_lower_locale(unsigned int ch)
- {
- return ((ch) < 256 ? tolower((ch)) : ch);
- }
- #define SRE_LOC_IS_DIGIT(ch) ((ch) < 256 ? isdigit((ch)) : 0)
- #define SRE_LOC_IS_SPACE(ch) ((ch) < 256 ? isspace((ch)) : 0)
- #define SRE_LOC_IS_LINEBREAK(ch) ((ch) == '\n')
- #define SRE_LOC_IS_ALNUM(ch) ((ch) < 256 ? isalnum((ch)) : 0)
- #define SRE_LOC_IS_WORD(ch) (SRE_LOC_IS_ALNUM((ch)) || (ch) == '_')
-
- /* unicode-specific character predicates */
-
- #if defined(HAVE_UNICODE)
- static unsigned int sre_lower_unicode(unsigned int ch)
- {
- return (unsigned int) Py_UNICODE_TOLOWER((Py_UNICODE)(ch));
- }
- #define SRE_UNI_IS_DIGIT(ch) Py_UNICODE_ISDIGIT((Py_UNICODE)(ch))
- #define SRE_UNI_IS_SPACE(ch) Py_UNICODE_ISSPACE((Py_UNICODE)(ch))
- #define SRE_UNI_IS_LINEBREAK(ch) Py_UNICODE_ISLINEBREAK((Py_UNICODE)(ch))
- #define SRE_UNI_IS_ALNUM(ch) Py_UNICODE_ISALNUM((Py_UNICODE)(ch))
- #define SRE_UNI_IS_WORD(ch) (SRE_UNI_IS_ALNUM((ch)) || (ch) == '_')
- #endif
-
- 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);
-
- #if defined(HAVE_UNICODE)
- 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);
- #endif
- }
- return 0;
- }
-
- /* helpers */
-
- static void
- mark_fini(SRE_STATE* state)
- {
- if (state->mark_stack) {
- free(state->mark_stack);
- state->mark_stack = NULL;
- }
- state->mark_stack_size = state->mark_stack_base = 0;
- }
-
- static int
- mark_save(SRE_STATE* state, int lo, int hi)
- {
- void* stack;
- int size;
- int minsize, newsize;
-
- if (hi <= lo)
- return 0;
-
- size = (hi - lo) + 1;
-
- newsize = state->mark_stack_size;
- minsize = state->mark_stack_base + size;
-
- if (newsize < minsize) {
- /* create new stack */
- if (!newsize) {
- newsize = 512;
- if (newsize < minsize)
- newsize = minsize;
- TRACE(("allocate stack %d\n", newsize));
- stack = malloc(sizeof(void*) * newsize);
- } else {
- /* grow the stack */
- while (newsize < minsize)
- newsize += newsize;
- TRACE(("grow stack to %d\n", newsize));
- stack = realloc(state->mark_stack, sizeof(void*) * newsize);
- }
- if (!stack) {
- mark_fini(state);
- return SRE_ERROR_MEMORY;
- }
- state->mark_stack = stack;
- state->mark_stack_size = newsize;
- }
-
- TRACE(("copy %d:%d to %d (%d)\n", lo, hi, state->mark_stack_base, size));
-
- memcpy(state->mark_stack + state->mark_stack_base, state->mark + lo,
- size * sizeof(void*));
-
- state->mark_stack_base += size;
-
- return 0;
- }
-
- static int
- mark_restore(SRE_STATE* state, int lo, int hi)
- {
- int size;
-
- if (hi <= lo)
- return 0;
-
- size = (hi - lo) + 1;
-
- state->mark_stack_base -= size;
-
- TRACE(("copy %d:%d from %d\n", lo, hi, state->mark_stack_base));
-
- memcpy(state->mark + lo, state->mark_stack + state->mark_stack_base,
- size * sizeof(void*));
-
- return 0;
- }
-
- /* generate 8-bit version */
-
- #define SRE_CHAR unsigned char
- #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_SEARCH sre_search
-
- #if defined(HAVE_UNICODE)
-
- #define SRE_RECURSIVE
- #include "_sre.c"
- #undef SRE_RECURSIVE
-
- #undef SRE_SEARCH
- #undef SRE_MATCH
- #undef SRE_INFO
- #undef SRE_CHARSET
- #undef SRE_COUNT
- #undef SRE_AT
- #undef SRE_CHAR
-
- /* generate 16-bit unicode version */
-
- #define SRE_CHAR Py_UNICODE
- #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_SEARCH sre_usearch
- #endif
-
- #endif /* SRE_RECURSIVE */
-
- /* -------------------------------------------------------------------- */
- /* String matching engine */
-
- /* the following section is compiled twice, with different character
- settings */
-
- LOCAL(int)
- SRE_AT(SRE_STATE* state, SRE_CHAR* ptr, SRE_CODE at)
- {
- /* check if pointer is at given position */
-
- int this, that;
-
- switch (at) {
-
- case SRE_AT_BEGINNING:
- return ((void*) ptr == state->beginning);
-
- case SRE_AT_BEGINNING_LINE:
- return ((void*) ptr == state->beginning ||
- SRE_IS_LINEBREAK((int) ptr[-1]));
-
- case SRE_AT_END:
- return (((void*) (ptr+1) == state->end &&
- SRE_IS_LINEBREAK((int) ptr[0])) ||
- ((void*) ptr == state->end));
-
- case SRE_AT_END_LINE:
- return ((void*) ptr == state->end ||
- SRE_IS_LINEBREAK((int) ptr[0]));
-
- case SRE_AT_BOUNDARY:
- if (state->beginning == state->end)
- return 0;
- that = ((void*) ptr > state->beginning) ?
- SRE_IS_WORD((int) ptr[-1]) : 0;
- this = ((void*) ptr < state->end) ?
- SRE_IS_WORD((int) ptr[0]) : 0;
- return this != that;
-
- case SRE_AT_NON_BOUNDARY:
- if (state->beginning == state->end)
- return 0;
- that = ((void*) ptr > state->beginning) ?
- SRE_IS_WORD((int) ptr[-1]) : 0;
- this = ((void*) ptr < state->end) ?
- SRE_IS_WORD((int) ptr[0]) : 0;
- return this == that;
- }
-
- 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_LITERAL:
- /* <LITERAL> <code> */
- if (ch == set[0])
- return ok;
- set++;
- break;
-
- case SRE_OP_RANGE:
- /* <RANGE> <lower> <upper> */
- if (set[0] <= ch && ch <= set[1])
- return ok;
- set += 2;
- break;
-
- case SRE_OP_CHARSET:
- /* <CHARSET> <bitmap> (16 bits per code word) */
- if (ch < 256 && (set[ch >> 4] & (1 << (ch & 15))))
- return ok;
- set += 16;
- break;
-
- case SRE_OP_CATEGORY:
- /* <CATEGORY> <code> */
- if (sre_category(set[0], (int) ch))
- return ok;
- set += 1;
- break;
-
- case SRE_OP_NEGATE:
- ok = !ok;
- break;
-
- case SRE_OP_FAILURE:
- return !ok;
-
- 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(int) SRE_MATCH(SRE_STATE* state, SRE_CODE* pattern, int level);
-
- LOCAL(int)
- SRE_COUNT(SRE_STATE* state, SRE_CODE* pattern, int maxcount, int level)
- {
- SRE_CODE chr;
- SRE_CHAR* ptr = state->ptr;
- SRE_CHAR* end = state->end;
- int i;
-
- /* adjust end */
- if (maxcount < end - ptr && maxcount != 65535)
- end = ptr + maxcount;
-
- switch (pattern[0]) {
-
- case SRE_OP_ANY:
- /* repeated dot wildcard. */
- TRACE(("|%p|%p|COUNT ANY\n", pattern, ptr));
- while (ptr < end && !SRE_IS_LINEBREAK(*ptr))
- ptr++;
- break;
-
- case SRE_OP_ANY_ALL:
- /* repeated dot wildcare. 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) *ptr == chr)
- ptr++;
- 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(*ptr) == chr)
- ptr++;
- 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) *ptr != chr)
- ptr++;
- 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(*ptr) != chr)
- ptr++;
- break;
-
- case SRE_OP_IN:
- /* repeated set */
- TRACE(("|%p|%p|COUNT IN\n", pattern, ptr));
- while (ptr < end && SRE_CHARSET(pattern + 2, *ptr))
- ptr++;
- break;
-
- default:
- /* repeated single character pattern */
- TRACE(("|%p|%p|COUNT SUBPATTERN\n", pattern, ptr));
- while ((SRE_CHAR*) state->ptr < end) {
- i = SRE_MATCH(state, pattern, level);
- if (i < 0)
- return i;
- if (!i)
- break;
- }
- TRACE(("|%p|%p|COUNT %d\n", pattern, ptr,
- (SRE_CHAR*) state->ptr - ptr));
- return (SRE_CHAR*) state->ptr - ptr;
- }
-
- TRACE(("|%p|%p|COUNT %d\n", pattern, ptr, ptr - (SRE_CHAR*) state->ptr));
- return ptr - (SRE_CHAR*) state->ptr;
- }
-
- #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 */
-
- SRE_CHAR* end = state->end;
- SRE_CHAR* ptr = state->ptr;
- int i;
-
- /* check minimal length */
- if (pattern[3] && (end - ptr) < 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) ptr[i] != pattern[7 + i])
- return 0;
- return pattern[0] + 2 * pattern[6];
- }
- return pattern[0];
- }
- #endif
-
- LOCAL(int)
- SRE_MATCH(SRE_STATE* state, SRE_CODE* pattern, int level)
- {
- /* check if string matches the given pattern. returns <0 for
- error, 0 for failure, and 1 for success */
-
- SRE_CHAR* end = state->end;
- SRE_CHAR* ptr = state->ptr;
- int i, count;
- SRE_REPEAT* rp;
- int lastmark;
- SRE_CODE chr;
-
- SRE_REPEAT rep; /* FIXME: <fl> allocate in STATE instead */
-
- TRACE(("|%p|%p|ENTER %d\n", pattern, ptr, level));
-
- #if defined(USE_STACKCHECK)
- if (level % 10 == 0 && PyOS_CheckStack())
- return SRE_ERROR_RECURSION_LIMIT;
- #endif
-
- #if defined(USE_RECURSION_LIMIT)
- if (level > USE_RECURSION_LIMIT)
- return SRE_ERROR_RECURSION_LIMIT;
- #endif
-
- if (pattern[0] == SRE_OP_INFO) {
- /* optimization info block */
- /* <INFO> <1=skip> <2=flags> <3=min> ... */
- if (pattern[3] && (end - ptr) < pattern[3]) {
- TRACE(("reject (got %d chars, need %d)\n",
- (end - ptr), pattern[3]));
- return 0;
- }
- pattern += pattern[1] + 1;
- }
-
- for (;;) {
-
- switch (*pattern++) {
-
- case SRE_OP_FAILURE:
- /* immediate failure */
- TRACE(("|%p|%p|FAILURE\n", pattern, ptr));
- return 0;
-
- case SRE_OP_SUCCESS:
- /* end of pattern */
- TRACE(("|%p|%p|SUCCESS\n", pattern, ptr));
- state->ptr = ptr;
- return 1;
-
- case SRE_OP_AT:
- /* match at given position */
- /* <AT> <code> */
- TRACE(("|%p|%p|AT %d\n", pattern, ptr, *pattern));
- if (!SRE_AT(state, ptr, *pattern))
- return 0;
- pattern++;
- break;
-
- case SRE_OP_CATEGORY:
- /* match at given category */
- /* <CATEGORY> <code> */
- TRACE(("|%p|%p|CATEGORY %d\n", pattern, ptr, *pattern));
- if (ptr >= end || !sre_category(pattern[0], ptr[0]))
- return 0;
- pattern++;
- ptr++;
- break;
-
- case SRE_OP_LITERAL:
- /* match literal string */
- /* <LITERAL> <code> */
- TRACE(("|%p|%p|LITERAL %d\n", pattern, ptr, *pattern));
- if (ptr >= end || (SRE_CODE) ptr[0] != pattern[0])
- return 0;
- pattern++;
- ptr++;
- break;
-
- case SRE_OP_NOT_LITERAL:
- /* match anything that is not literal character */
- /* <NOT_LITERAL> <code> */
- TRACE(("|%p|%p|NOT_LITERAL %d\n", pattern, ptr, *pattern));
- if (ptr >= end || (SRE_CODE) ptr[0] == pattern[0])
- return 0;
- pattern++;
- ptr++;
- break;
-
- case SRE_OP_ANY:
- /* match anything (except a newline) */
- /* <ANY> */
- TRACE(("|%p|%p|ANY\n", pattern, ptr));
- if (ptr >= end || SRE_IS_LINEBREAK(ptr[0]))
- return 0;
- ptr++;
- break;
-
- case SRE_OP_ANY_ALL:
- /* match anything */
- /* <ANY_ALL> */
- TRACE(("|%p|%p|ANY_ALL\n", pattern, ptr));
- if (ptr >= end)
- return 0;
- ptr++;
- break;
-
- case SRE_OP_IN:
- /* match set member (or non_member) */
- /* <IN> <skip> <set> */
- TRACE(("|%p|%p|IN\n", pattern, ptr));
- if (ptr >= end || !SRE_CHARSET(pattern + 1, *ptr))
- return 0;
- pattern += pattern[0];
- ptr++;
- break;
-
- case SRE_OP_GROUPREF:
- /* match backreference */
- TRACE(("|%p|%p|GROUPREF %d\n", pattern, ptr, pattern[0]));
- i = pattern[0];
- {
- SRE_CHAR* p = (SRE_CHAR*) state->mark[i+i];
- SRE_CHAR* e = (SRE_CHAR*) state->mark[i+i+1];
- if (!p || !e || e < p)
- return 0;
- while (p < e) {
- if (ptr >= end || *ptr != *p)
- return 0;
- p++; ptr++;
- }
- }
- pattern++;
- break;
-
- case SRE_OP_GROUPREF_IGNORE:
- /* match backreference */
- TRACE(("|%p|%p|GROUPREF_IGNORE %d\n", pattern, ptr, pattern[0]));
- i = pattern[0];
- {
- SRE_CHAR* p = (SRE_CHAR*) state->mark[i+i];
- SRE_CHAR* e = (SRE_CHAR*) state->mark[i+i+1];
- if (!p || !e || e < p)
- return 0;
- while (p < e) {
- if (ptr >= end ||
- state->lower(*ptr) != state->lower(*p))
- return 0;
- p++; ptr++;
- }
- }
- pattern++;
- break;
-
- case SRE_OP_LITERAL_IGNORE:
- TRACE(("|%p|%p|LITERAL_IGNORE %d\n", pattern, ptr, pattern[0]));
- if (ptr >= end ||
- state->lower(*ptr) != state->lower(*pattern))
- return 0;
- pattern++;
- ptr++;
- break;
-
- case SRE_OP_NOT_LITERAL_IGNORE:
- TRACE(("|%p|%p|NOT_LITERAL_IGNORE %d\n", pattern, ptr, *pattern));
- if (ptr >= end ||
- state->lower(*ptr) == state->lower(*pattern))
- return 0;
- pattern++;
- ptr++;
- break;
-
- case SRE_OP_IN_IGNORE:
- TRACE(("|%p|%p|IN_IGNORE\n", pattern, ptr));
- if (ptr >= end
- || !SRE_CHARSET(pattern + 1, (SRE_CODE) state->lower(*ptr)))
- return 0;
- pattern += pattern[0];
- ptr++;
- break;
-
- case SRE_OP_MARK:
- /* set mark */
- /* <MARK> <gid> */
- TRACE(("|%p|%p|MARK %d\n", pattern, ptr, pattern[0]));
- i = pattern[0];
- if (i & 1)
- state->lastindex = i/2 + 1;
- if (i > state->lastmark)
- state->lastmark = i;
- state->mark[i] = ptr;
- pattern++;
- break;
-
- case SRE_OP_JUMP:
- case SRE_OP_INFO:
- /* jump forward */
- /* <JUMP> <offset> */
- TRACE(("|%p|%p|JUMP %d\n", pattern, ptr, pattern[0]));
- pattern += pattern[0];
- break;
-
- case SRE_OP_ASSERT:
- /* assert subpattern */
- /* <ASSERT> <skip> <back> <pattern> */
- TRACE(("|%p|%p|ASSERT %d\n", pattern, ptr, pattern[1]));
- state->ptr = ptr - pattern[1];
- if (state->ptr < state->beginning)
- return 0;
- i = SRE_MATCH(state, pattern + 2, level + 1);
- if (i <= 0)
- return i;
- pattern += pattern[0];
- break;
-
- case SRE_OP_ASSERT_NOT:
- /* assert not subpattern */
- /* <ASSERT_NOT> <skip> <back> <pattern> */
- TRACE(("|%p|%p|ASSERT_NOT %d\n", pattern, ptr, pattern[1]));
- state->ptr = ptr - pattern[1];
- if (state->ptr < state->beginning)
- return 0;
- i = SRE_MATCH(state, pattern + 2, level + 1);
- if (i < 0)
- return i;
- if (i)
- return 0;
- pattern += pattern[0];
- break;
-
- case SRE_OP_BRANCH:
- /* alternation */
- /* <BRANCH> <0=skip> code <JUMP> ... <NULL> */
- TRACE(("|%p|%p|BRANCH\n", pattern, ptr));
- lastmark = state->lastmark;
- for (; pattern[0]; pattern += pattern[0]) {
- if (pattern[1] == SRE_OP_LITERAL &&
- (ptr >= end || (SRE_CODE) *ptr != pattern[2]))
- continue;
- if (pattern[1] == SRE_OP_IN &&
- (ptr >= end || !SRE_CHARSET(pattern + 3, (SRE_CODE) *ptr)))
- continue;
- state->ptr = ptr;
- i = SRE_MATCH(state, pattern + 1, level + 1);
- if (i)
- return i;
- if (state->lastmark > lastmark) {
- memset(
- state->mark + lastmark + 1, 0,
- (state->lastmark - lastmark) * sizeof(void*)
- );
- state->lastmark = lastmark;
- }
- }
- return 0;
-
- 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 instead */
-
- /* <REPEAT_ONE> <skip> <1=min> <2=max> item <SUCCESS> tail */
-
- TRACE(("|%p|%p|REPEAT_ONE %d %d\n", pattern, ptr,
- pattern[1], pattern[2]));
-
- if (ptr + pattern[1] > end)
- return 0; /* cannot match */
-
- state->ptr = ptr;
-
- count = SRE_COUNT(state, pattern + 3, pattern[2], level + 1);
- if (count < 0)
- return count;
-
- ptr += count;
-
- /* when we arrive here, count contains the number of
- matches, and ptr points to the tail of the target
- string. check if the rest of the pattern matches,
- and backtrack if not. */
-
- if (count < (int) pattern[1])
- return 0;
-
- if (pattern[pattern[0]] == SRE_OP_SUCCESS) {
- /* tail is empty. we're finished */
- state->ptr = ptr;
- return 1;
-
- } else if (pattern[pattern[0]] == SRE_OP_LITERAL) {
- /* tail starts with a literal. skip positions where
- the rest of the pattern cannot possibly match */
- chr = pattern[pattern[0]+1];
- for (;;) {
- while (count >= (int) pattern[1] &&
- (ptr >= end || *ptr != chr)) {
- ptr--;
- count--;
- }
- if (count < (int) pattern[1])
- break;
- state->ptr = ptr;
- i = SRE_MATCH(state, pattern + pattern[0], level + 1);
- if (i)
- return i;
- ptr--;
- count--;
- }
-
- } else {
- /* general case */
- lastmark = state->lastmark;
- while (count >= (int) pattern[1]) {
- state->ptr = ptr;
- i = SRE_MATCH(state, pattern + pattern[0], level + 1);
- if (i)
- return i;
- ptr--;
- count--;
- if (state->lastmark > lastmark) {
- memset(
- state->mark + lastmark + 1, 0,
- (state->lastmark - lastmark) * sizeof(void*)
- );
- state->lastmark = lastmark;
- }
- }
- }
- return 0;
-
- case SRE_OP_REPEAT:
- /* create repeat context. all the hard work is done
- by the UNTIL operator */
- /* <REPEAT> <skip> <1=min> <2=max> item <UNTIL> tail */
- TRACE(("|%p|%p|REPEAT %d %d\n", pattern, ptr,
- pattern[1], pattern[2]));
-
- rep.count = -1;
- rep.pattern = pattern;
-
- /* install new repeat context */
- rep.prev = state->repeat;
- state->repeat = &rep;
-
- state->ptr = ptr;
- i = SRE_MATCH(state, pattern + pattern[0], level + 1);
-
- state->repeat = rep.prev;
-
- return i;
-
- 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... */
-
- rp = state->repeat;
- if (!rp)
- return SRE_ERROR_STATE;
-
- state->ptr = ptr;
-
- count = rp->count + 1;
-
- TRACE(("|%p|%p|MAX_UNTIL %d\n", pattern, ptr, count));
-
- if (count < rp->pattern[1]) {
- /* not enough matches */
- rp->count = count;
- /* RECURSIVE */
- i = SRE_MATCH(state, rp->pattern + 3, level + 1);
- if (i)
- return i;
- rp->count = count - 1;
- state->ptr = ptr;
- return 0;
- }
-
- if (count < rp->pattern[2] || rp->pattern[2] == 65535) {
- /* we may have enough matches, but if we can
- match another item, do so */
- rp->count = count;
- lastmark = state->lastmark;
- i = mark_save(state, 0, lastmark);
- if (i < 0)
- return i;
- /* RECURSIVE */
- i = SRE_MATCH(state, rp->pattern + 3, level + 1);
- if (i)
- return i;
- i = mark_restore(state, 0, lastmark);
- if (i < 0)
- return i;
- rp->count = count - 1;
- state->ptr = ptr;
- }
-
- /* cannot match more repeated items here. make sure the
- tail matches */
- state->repeat = rp->prev;
- i = SRE_MATCH(state, pattern, level + 1);
- if (i)
- return i;
- state->repeat = rp;
- return 0;
-
- case SRE_OP_MIN_UNTIL:
- /* minimizing repeat */
- /* <REPEAT> <skip> <1=min> <2=max> item <MIN_UNTIL> tail */
-
- rp = state->repeat;
- if (!rp)
- return SRE_ERROR_STATE;
-
- count = rp->count + 1;
-
- TRACE(("|%p|%p|MIN_UNTIL %d\n", pattern, ptr, count));
-
- state->ptr = ptr;
-
- if (count < rp->pattern[1]) {
- /* not enough matches */
- rp->count = count;
- /* RECURSIVE */
- i = SRE_MATCH(state, rp->pattern + 3, level + 1);
- if (i)
- return i;
- rp->count = count-1;
- state->ptr = ptr;
- return 0;
- }
-
- /* see if the tail matches */
- state->repeat = rp->prev;
- i = SRE_MATCH(state, pattern, level + 1);
- if (i) {
- /* free(rp); */
- return i;
- }
- state->repeat = rp;
-
- if (count >= rp->pattern[2] && rp->pattern[2] != 65535)
- return 0;
-
- rp->count = count;
- /* RECURSIVE */
- i = SRE_MATCH(state, rp->pattern + 3, level + 1);
- if (i)
- return i;
- rp->count = count - 1;
- return 0;
-
- default:
- TRACE(("|%p|%p|UNKNOWN %d\n", pattern, ptr, pattern[-1]));
- return SRE_ERROR_ILLEGAL;
- }
- }
-
- /* shouldn't end up here */
- return SRE_ERROR_ILLEGAL;
- }
-
- LOCAL(int)
- SRE_SEARCH(SRE_STATE* state, SRE_CODE* pattern)
- {
- SRE_CHAR* ptr = state->start;
- SRE_CHAR* end = state->end;
- int status = 0;
- int prefix_len = 0;
- int 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] > 0) {
- /* adjust end point (but make sure we leave at least one
- character in there, so literal search will work) */
- end -= pattern[3]-1;
- if (end <= ptr)
- end = ptr+1;
- }
-
- 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 */
- int i = 0;
- end = state->end;
- while (ptr < end) {
- for (;;) {
- if ((SRE_CODE) 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 + 1 - prefix_len;
- state->ptr = ptr + 1 - prefix_len + prefix_skip;
- if (flags & SRE_INFO_LITERAL)
- return 1; /* we got all of it */
- status = SRE_MATCH(state, pattern + 2*prefix_skip, 1);
- if (status != 0)
- return status;
- /* close but no cigar -- try again */
- i = overlap[i];
- }
- break;
- }
-
- }
- ptr++;
- }
- 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 = state->end;
- for (;;) {
- while (ptr < end && (SRE_CODE) ptr[0] != chr)
- ptr++;
- if (ptr == end)
- return 0;
- TRACE(("|%p|%p|SEARCH LITERAL\n", pattern, ptr));
- state->start = ptr;
- state->ptr = ++ptr;
- status = SRE_MATCH(state, pattern + 2, 1);
- if (status != 0)
- break;
- }
- } else if (charset) {
- /* pattern starts with a character from a known set */
- end = state->end;
- for (;;) {
- while (ptr < end && !SRE_CHARSET(charset, ptr[0]))
- ptr++;
- if (ptr == end)
- return 0;
- TRACE(("|%p|%p|SEARCH CHARSET\n", pattern, ptr));
- state->start = ptr;
- state->ptr = ptr;
- status = SRE_MATCH(state, pattern, 1);
- if (status != 0)
- break;
- ptr++;
- }
- } else
- /* general case */
- while (ptr <= end) {
- TRACE(("|%p|%p|SEARCH\n", pattern, ptr));
- state->start = state->ptr = ptr++;
- status = SRE_MATCH(state, pattern, 1);
- if (status != 0)
- break;
- }
-
- return status;
- }
-
-
- #if !defined(SRE_RECURSIVE)
-
- /* -------------------------------------------------------------------- */
- /* factories and destructors */
-
- /* see sre.h for object declarations */
-
- staticforward PyTypeObject Pattern_Type;
- staticforward PyTypeObject Match_Type;
- staticforward PyTypeObject Scanner_Type;
-
- static PyObject *
- _compile(PyObject* self_, PyObject* args)
- {
- /* "compile" pattern descriptor to pattern object */
-
- PatternObject* self;
- int i, n;
-
- PyObject* pattern;
- int flags = 0;
- PyObject* code;
- int groups = 0;
- PyObject* groupindex = NULL;
- PyObject* indexgroup = NULL;
- if (!PyArg_ParseTuple(args, "OiO|iOO", &pattern, &flags, &code,
- &groups, &groupindex, &indexgroup))
- return NULL;
-
- code = PySequence_Fast(code, "code argument must be a sequence");
- if (!code)
- return NULL;
-
- #if PY_VERSION_HEX >= 0x01060000
- n = PySequence_Size(code);
- #else
- n = PySequence_Length(code);
- #endif
-
- self = PyObject_NEW_VAR(PatternObject, &Pattern_Type, 100*n);
- if (!self) {
- Py_DECREF(code);
- return NULL;
- }
-
- for (i = 0; i < n; i++) {
- PyObject *o = PySequence_Fast_GET_ITEM(code, i);
- self->code[i] = (SRE_CODE) PyInt_AsLong(o);
- }
-
- Py_DECREF(code);
-
- if (PyErr_Occurred())
- 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;
-
- return (PyObject*) self;
- }
-
- static PyObject *
- sre_codesize(PyObject* self, PyObject* args)
- {
- return Py_BuildValue("i", 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 defined(HAVE_UNICODE)
- if (flags & SRE_FLAG_UNICODE)
- return Py_BuildValue("i", sre_lower_unicode(character));
- #endif
- return Py_BuildValue("i", sre_lower(character));
- }
-
- LOCAL(void)
- state_reset(SRE_STATE* state)
- {
- int i;
-
- state->lastmark = 0;
-
- /* FIXME: dynamic! */
- for (i = 0; i < SRE_MARK_SIZE; i++)
- state->mark[i] = NULL;
-
- state->lastindex = -1;
-
- state->repeat = NULL;
-
- mark_fini(state);
- }
-
- LOCAL(PyObject*)
- state_init(SRE_STATE* state, PatternObject* pattern, PyObject* string,
- int start, int end)
- {
- /* prepare state object */
-
- PyBufferProcs *buffer;
- int size, bytes;
- void* ptr;
-
- memset(state, 0, sizeof(SRE_STATE));
-
- state->lastindex = -1;
-
- #if defined(HAVE_UNICODE)
- if (PyUnicode_Check(string)) {
- /* unicode strings doesn't always support the buffer interface */
- ptr = (void*) PyUnicode_AS_DATA(string);
- bytes = PyUnicode_GET_DATA_SIZE(string);
- size = PyUnicode_GET_SIZE(string);
- state->charsize = sizeof(Py_UNICODE);
-
- } else {
- #endif
-
- /* get pointer to string buffer */
- buffer = string->ob_type->tp_as_buffer;
- if (!buffer || !buffer->bf_getreadbuffer || !buffer->bf_getsegcount ||
- buffer->bf_getsegcount(string, NULL) != 1) {
- PyErr_SetString(PyExc_TypeError, "expected string or buffer");
- return NULL;
- }
-
- /* determine buffer size */
- bytes = buffer->bf_getreadbuffer(string, 0, &ptr);
- if (bytes < 0) {
- PyErr_SetString(PyExc_TypeError, "buffer has negative size");
- return NULL;
- }
-
- /* determine character size */
- #if PY_VERSION_HEX >= 0x01060000
- size = PyObject_Size(string);
- #else
- size = PyObject_Length(string);
- #endif
-
- if (PyString_Check(string) || bytes == size)
- state->charsize = 1;
- #if defined(HAVE_UNICODE)
- else if (bytes == (int) (size * sizeof(Py_UNICODE)))
- state->charsize = sizeof(Py_UNICODE);
- #endif
- else {
- PyErr_SetString(PyExc_TypeError, "buffer size mismatch");
- return NULL;
- }
-
- #if defined(HAVE_UNICODE)
- }
- #endif
-
- /* adjust boundaries */
- if (start < 0)
- start = 0;
- else if (start > size)
- start = size;
-
- if (end < 0)
- end = 0;
- else if (end > size)
- end = size;
-
- 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;
- #if defined(HAVE_UNICODE)
- else if (pattern->flags & SRE_FLAG_UNICODE)
- state->lower = sre_lower_unicode;
- #endif
- else
- state->lower = sre_lower;
-
- return string;
- }
-
- LOCAL(void)
- state_fini(SRE_STATE* state)
- {
- Py_XDECREF(state->string);
- mark_fini(state);
- }
-
- LOCAL(PyObject*)
- state_getslice(SRE_STATE* state, int index, PyObject* string)
- {
- int i, j;
-
- index = (index - 1) * 2;
-
- if (string == Py_None || !state->mark[index] || !state->mark[index+1]) {
- i = j = 0;
- } else {
- i = ((char*)state->mark[index] - (char*)state->beginning) /
- state->charsize;
- j = ((char*)state->mark[index+1] - (char*)state->beginning) /
- state->charsize;
- }
-
- 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;
- default:
- /* other error codes indicate compiler/engine bugs */
- PyErr_SetString(
- PyExc_RuntimeError,
- "internal error in regular expression engine"
- );
- }
- }
-
- static PyObject*
- pattern_new_match(PatternObject* pattern, SRE_STATE* state, int status)
- {
- /* create match object (from state object) */
-
- MatchObject* match;
- int i, j;
- char* base;
- int n;
-
- if (status > 0) {
-
- /* create match object (with room for extra group marks) */
- 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;
- }
-
- static PyObject*
- pattern_scanner(PatternObject* pattern, PyObject* args)
- {
- /* create search state object */
-
- ScannerObject* self;
-
- PyObject* string;
- int start = 0;
- int end = INT_MAX;
- if (!PyArg_ParseTuple(args, "O|ii:scanner", &string, &start, &end))
- return NULL;
-
- /* create scanner object */
- self = PyObject_NEW(ScannerObject, &Scanner_Type);
- if (!self)
- return NULL;
-
- string = state_init(&self->state, pattern, string, start, end);
- if (!string) {
- PyObject_Del(self);
- return NULL;
- }
-
- Py_INCREF(pattern);
- self->pattern = (PyObject*) pattern;
-
- return (PyObject*) self;
- }
-
- static void
- pattern_dealloc(PatternObject* self)
- {
- Py_XDECREF(self->pattern);
- Py_XDECREF(self->groupindex);
- PyObject_DEL(self);
- }
-
- static PyObject*
- pattern_match(PatternObject* self, PyObject* args, PyObject* kw)
- {
- SRE_STATE state;
- int status;
-
- PyObject* string;
- int start = 0;
- int end = INT_MAX;
- static char* kwlist[] = { "pattern", "pos", "endpos", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "O|ii: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.charsize == 1) {
- status = sre_match(&state, PatternObject_GetCode(self), 1);
- } else {
- #if defined(HAVE_UNICODE)
- status = sre_umatch(&state, PatternObject_GetCode(self), 1);
- #endif
- }
-
- TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
-
- 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;
- int start = 0;
- int end = INT_MAX;
- static char* kwlist[] = { "pattern", "pos", "endpos", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "O|ii: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.charsize == 1) {
- status = sre_search(&state, PatternObject_GetCode(self));
- } else {
- #if defined(HAVE_UNICODE)
- status = sre_usearch(&state, PatternObject_GetCode(self));
- #endif
- }
-
- TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
-
- state_fini(&state);
-
- return pattern_new_match(self, &state, status);
- }
-
- static PyObject*
- call(char* function, PyObject* args)
- {
- PyObject* name;
- PyObject* module;
- PyObject* func;
- PyObject* result;
-
- name = PyString_FromString(MODULE);
- if (!name)
- return NULL;
- module = PyImport_Import(name);
- Py_DECREF(name);
- if (!module)
- return NULL;
- func = PyObject_GetAttrString(module, function);
- Py_DECREF(module);
- if (!func)
- return NULL;
- result = PyObject_CallObject(func, args);
- Py_DECREF(func);
- Py_DECREF(args);
- return result;
- }
-
- static PyObject*
- pattern_sub(PatternObject* self, PyObject* args, PyObject* kw)
- {
- PyObject* template;
- PyObject* string;
- PyObject* count = Py_False; /* zero */
- static char* kwlist[] = { "repl", "string", "count", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|O:sub", kwlist,
- &template, &string, &count))
- return NULL;
-
- /* delegate to Python code */
- return call("_sub", Py_BuildValue("OOOO", self, template, string, count));
- }
-
- static PyObject*
- pattern_subn(PatternObject* self, PyObject* args, PyObject* kw)
- {
- PyObject* template;
- PyObject* string;
- PyObject* count = Py_False; /* zero */
- static char* kwlist[] = { "repl", "string", "count", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|O:subn", kwlist,
- &template, &string, &count))
- return NULL;
-
- /* delegate to Python code */
- return call("_subn", Py_BuildValue("OOOO", self, template, string, count));
- }
-
- static PyObject*
- pattern_split(PatternObject* self, PyObject* args, PyObject* kw)
- {
- PyObject* string;
- PyObject* maxsplit = Py_False; /* zero */
- static char* kwlist[] = { "source", "maxsplit", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "O|O:split", kwlist,
- &string, &maxsplit))
- return NULL;
-
- /* delegate to Python code */
- return call("_split", Py_BuildValue("OOO", self, string, maxsplit));
- }
-
- static PyObject*
- pattern_findall(PatternObject* self, PyObject* args, PyObject* kw)
- {
- SRE_STATE state;
- PyObject* list;
- int status;
- int i;
-
- PyObject* string;
- int start = 0;
- int end = INT_MAX;
- static char* kwlist[] = { "source", "pos", "endpos", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "O|ii:findall", kwlist,
- &string, &start, &end))
- return NULL;
-
- string = state_init(&state, self, string, start, end);
- if (!string)
- return NULL;
-
- list = PyList_New(0);
-
- while (state.start <= state.end) {
-
- PyObject* item;
-
- state.ptr = state.start;
-
- if (state.charsize == 1) {
- status = sre_search(&state, PatternObject_GetCode(self));
- } else {
- #if defined(HAVE_UNICODE)
- status = sre_usearch(&state, PatternObject_GetCode(self));
- #endif
- }
-
- if (status > 0) {
-
- /* don't bother to build a match object */
- switch (self->groups) {
- case 0:
- item = PySequence_GetSlice(
- string,
- ((char*) state.start - (char*) state.beginning) /
- state.charsize,
- ((char*) state.ptr - (char*) state.beginning) /
- state.charsize);
- if (!item)
- goto error;
- break;
- case 1:
- item = state_getslice(&state, 1, string);
- 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);
- 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;
-
- } else {
-
- if (status == 0)
- break;
-
- pattern_error(status);
- goto error;
-
- }
- }
-
- state_fini(&state);
- return list;
-
- error:
- Py_DECREF(list);
- state_fini(&state);
- return NULL;
-
- }
-
- static PyMethodDef pattern_methods[] = {
- {"match", (PyCFunction) pattern_match, METH_VARARGS|METH_KEYWORDS},
- {"search", (PyCFunction) pattern_search, METH_VARARGS|METH_KEYWORDS},
- {"sub", (PyCFunction) pattern_sub, METH_VARARGS|METH_KEYWORDS},
- {"subn", (PyCFunction) pattern_subn, METH_VARARGS|METH_KEYWORDS},
- {"split", (PyCFunction) pattern_split, METH_VARARGS|METH_KEYWORDS},
- {"findall", (PyCFunction) pattern_findall, METH_VARARGS|METH_KEYWORDS},
- /* experimental */
- {"scanner", (PyCFunction) pattern_scanner, METH_VARARGS},
- {NULL, NULL}
- };
-
- static PyObject*
- pattern_getattr(PatternObject* self, char* name)
- {
- PyObject* res;
-
- res = Py_FindMethod(pattern_methods, (PyObject*) self, name);
-
- if (res)
- return res;
-
- PyErr_Clear();
-
- /* attributes */
- if (!strcmp(name, "pattern")) {
- Py_INCREF(self->pattern);
- return self->pattern;
- }
-
- if (!strcmp(name, "flags"))
- return Py_BuildValue("i", self->flags);
-
- if (!strcmp(name, "groups"))
- return Py_BuildValue("i", self->groups);
-
- if (!strcmp(name, "groupindex") && self->groupindex) {
- Py_INCREF(self->groupindex);
- return self->groupindex;
- }
-
- PyErr_SetString(PyExc_AttributeError, name);
- return NULL;
- }
-
- statichere PyTypeObject Pattern_Type = {
- PyObject_HEAD_INIT(NULL)
- 0, "SRE_Pattern",
- sizeof(PatternObject), sizeof(SRE_CODE),
- (destructor)pattern_dealloc, /*tp_dealloc*/
- 0, /*tp_print*/
- (getattrfunc)pattern_getattr /*tp_getattr*/
- };
-
- /* -------------------------------------------------------------------- */
- /* 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, int 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 int
- match_getindex(MatchObject* self, PyObject* index)
- {
- int i;
-
- if (PyInt_Check(index))
- return (int) PyInt_AS_LONG(index);
-
- i = -1;
-
- if (self->pattern->groupindex) {
- index = PyObject_GetItem(self->pattern->groupindex, index);
- if (index) {
- if (PyInt_Check(index))
- i = (int) PyInt_AS_LONG(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* args)
- {
- PyObject* template;
- if (!PyArg_ParseTuple(args, "O:expand", &template))
- return NULL;
-
- /* delegate to Python code */
- return call(
- "_expand",
- Py_BuildValue("OOO", self->pattern, self, template)
- );
- }
-
- static PyObject*
- match_group(MatchObject* self, PyObject* args)
- {
- PyObject* result;
- int 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;
- int 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;
- int index;
-
- PyObject* def = Py_None;
- static char* kwlist[] = { "default", NULL };
- if (!PyArg_ParseTupleAndKeywords(args, kw, "|O:groups", kwlist, &def))
- return NULL;
-
- result = PyDict_New();
- if (!result || !self->pattern->groupindex)
- return result;
-
- keys = PyMapping_Keys(self->pattern->groupindex);
- if (!keys) {
- Py_DECREF(result);
- return NULL;
- }
-
- for (index = 0; index < PyList_GET_SIZE(keys); index++) {
- PyObject* key;
- PyObject* item;
- key = PyList_GET_ITEM(keys, index);
- if (!key) {
- Py_DECREF(keys);
- Py_DECREF(result);
- return NULL;
- }
- item = match_getslice(self, key, def);
- if (!item) {
- Py_DECREF(key);
- Py_DECREF(keys);
- Py_DECREF(result);
- return NULL;
- }
- /* FIXME: <fl> this can fail, right? */
- PyDict_SetItem(result, key, item);
- }
-
- Py_DECREF(keys);
-
- return result;
- }
-
- static PyObject*
- match_start(MatchObject* self, PyObject* args)
- {
- int index;
-
- PyObject* index_ = Py_False; /* zero */
- if (!PyArg_ParseTuple(args, "|O:start", &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 Py_BuildValue("i", self->mark[index*2]);
- }
-
- static PyObject*
- match_end(MatchObject* self, PyObject* args)
- {
- int index;
-
- PyObject* index_ = Py_False; /* zero */
- if (!PyArg_ParseTuple(args, "|O:end", &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 Py_BuildValue("i", self->mark[index*2+1]);
- }
-
- LOCAL(PyObject*)
- _pair(int i1, int i2)
- {
- PyObject* pair;
- PyObject* item;
-
- pair = PyTuple_New(2);
- if (!pair)
- return NULL;
-
- item = PyInt_FromLong(i1);
- if (!item)
- goto error;
- PyTuple_SET_ITEM(pair, 0, item);
-
- item = PyInt_FromLong(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)
- {
- int index;
-
- PyObject* index_ = Py_False; /* zero */
- if (!PyArg_ParseTuple(args, "|O:span", &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;
- int 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 PyMethodDef match_methods[] = {
- {"group", (PyCFunction) match_group, METH_VARARGS},
- {"start", (PyCFunction) match_start, METH_VARARGS},
- {"end", (PyCFunction) match_end, METH_VARARGS},
- {"span", (PyCFunction) match_span, METH_VARARGS},
- {"groups", (PyCFunction) match_groups, METH_VARARGS|METH_KEYWORDS},
- {"groupdict", (PyCFunction) match_groupdict, METH_VARARGS|METH_KEYWORDS},
- {"expand", (PyCFunction) match_expand, METH_VARARGS},
- {NULL, NULL}
- };
-
- static PyObject*
- match_getattr(MatchObject* self, char* name)
- {
- PyObject* res;
-
- res = Py_FindMethod(match_methods, (PyObject*) self, name);
- if (res)
- return res;
-
- PyErr_Clear();
-
- if (!strcmp(name, "lastindex")) {
- if (self->lastindex >= 0)
- return Py_BuildValue("i", self->lastindex);
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- if (!strcmp(name, "lastgroup")) {
- 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;
- }
-
- if (!strcmp(name, "string")) {
- if (self->string) {
- Py_INCREF(self->string);
- return self->string;
- } else {
- Py_INCREF(Py_None);
- return Py_None;
- }
- }
-
- if (!strcmp(name, "regs")) {
- if (self->regs) {
- Py_INCREF(self->regs);
- return self->regs;
- } else
- return match_regs(self);
- }
-
- if (!strcmp(name, "re")) {
- Py_INCREF(self->pattern);
- return (PyObject*) self->pattern;
- }
-
- if (!strcmp(name, "pos"))
- return Py_BuildValue("i", self->pos);
-
- if (!strcmp(name, "endpos"))
- return Py_BuildValue("i", self->endpos);
-
- PyErr_SetString(PyExc_AttributeError, name);
- return NULL;
- }
-
- /* FIXME: implement setattr("string", None) as a special case (to
- detach the associated string, if any */
-
- statichere PyTypeObject Match_Type = {
- PyObject_HEAD_INIT(NULL)
- 0, "SRE_Match",
- sizeof(MatchObject), sizeof(int),
- (destructor)match_dealloc, /*tp_dealloc*/
- 0, /*tp_print*/
- (getattrfunc)match_getattr /*tp_getattr*/
- };
-
- /* -------------------------------------------------------------------- */
- /* scanner methods (experimental) */
-
- static void
- scanner_dealloc(ScannerObject* self)
- {
- state_fini(&self->state);
- Py_DECREF(self->pattern);
- PyObject_DEL(self);
- }
-
- static PyObject*
- scanner_match(ScannerObject* self, PyObject* args)
- {
- SRE_STATE* state = &self->state;
- PyObject* match;
- int status;
-
- state_reset(state);
-
- state->ptr = state->start;
-
- if (state->charsize == 1) {
- status = sre_match(state, PatternObject_GetCode(self->pattern), 1);
- } else {
- #if defined(HAVE_UNICODE)
- status = sre_umatch(state, PatternObject_GetCode(self->pattern), 1);
- #endif
- }
-
- 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* args)
- {
- SRE_STATE* state = &self->state;
- PyObject* match;
- int status;
-
- state_reset(state);
-
- state->ptr = state->start;
-
- if (state->charsize == 1) {
- status = sre_search(state, PatternObject_GetCode(self->pattern));
- } else {
- #if defined(HAVE_UNICODE)
- status = sre_usearch(state, PatternObject_GetCode(self->pattern));
- #endif
- }
-
- 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, 0},
- {"search", (PyCFunction) scanner_search, 0},
- {NULL, NULL}
- };
-
- static PyObject*
- scanner_getattr(ScannerObject* self, char* name)
- {
- PyObject* res;
-
- res = Py_FindMethod(scanner_methods, (PyObject*) self, name);
- if (res)
- return res;
-
- PyErr_Clear();
-
- /* attributes */
- if (!strcmp(name, "pattern")) {
- Py_INCREF(self->pattern);
- return self->pattern;
- }
-
- PyErr_SetString(PyExc_AttributeError, name);
- return NULL;
- }
-
- statichere PyTypeObject Scanner_Type = {
- PyObject_HEAD_INIT(NULL)
- 0, "SRE_Scanner",
- sizeof(ScannerObject), 0,
- (destructor)scanner_dealloc, /*tp_dealloc*/
- 0, /*tp_print*/
- (getattrfunc)scanner_getattr, /*tp_getattr*/
- };
-
- static PyMethodDef _functions[] = {
- {"compile", _compile, 1},
- {"getcodesize", sre_codesize, 1},
- {"getlower", sre_getlower, 1},
- {NULL, NULL}
- };
-
- void
- #if defined(WIN32)
- __declspec(dllexport)
- #endif
- init_sre(void)
- {
- /* Patch object types */
- Pattern_Type.ob_type = Match_Type.ob_type =
- Scanner_Type.ob_type = &PyType_Type;
-
- Py_InitModule("_" MODULE, _functions);
- }
-
- #endif /* !defined(SRE_RECURSIVE) */
-