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Copy path_sre.c
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2968 lines (2482 loc) · 79.1 KB
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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
* 2013-02-04 mrab added fullmatch primitive
*
* 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.
*/
static const char copyright[] =
" SRE 2.2.2 Copyright (c) 1997-2002 by Secret Labs AB ";
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pycore_long.h" // _PyLong_GetZero()
#include "pycore_moduleobject.h" // _PyModule_GetState()
#include "structmember.h" // PyMemberDef
#include "sre.h"
#define SRE_CODE_BITS (8 * sizeof(SRE_CODE))
#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
/* -------------------------------------------------------------------- */
#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
#else
#define LOCAL(type) static inline 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 */
#define SRE_IS_DIGIT(ch)\
((ch) <= '9' && Py_ISDIGIT(ch))
#define SRE_IS_SPACE(ch)\
((ch) <= ' ' && Py_ISSPACE(ch))
#define SRE_IS_LINEBREAK(ch)\
((ch) == '\n')
#define SRE_IS_WORD(ch)\
((ch) <= 'z' && (Py_ISALNUM(ch) || (ch) == '_'))
static unsigned int sre_lower_ascii(unsigned int ch)
{
return ((ch) < 128 ? Py_TOLOWER(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_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);
}
static unsigned int sre_upper_locale(unsigned int ch)
{
return ((ch) < 256 ? (unsigned int)toupper((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);
}
static unsigned int sre_upper_unicode(unsigned int ch)
{
return (unsigned int) Py_UNICODE_TOUPPER(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;
}
LOCAL(int)
char_loc_ignore(SRE_CODE pattern, SRE_CODE ch)
{
return ch == pattern
|| (SRE_CODE) sre_lower_locale(ch) == pattern
|| (SRE_CODE) sre_upper_locale(ch) == pattern;
}
/* helpers */
static void
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 %zd\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 Py_UCS1
#define SIZEOF_SRE_CHAR 1
#define SRE(F) sre_ucs1_##F
#include "sre_lib.h"
/* generate 16-bit unicode version */
#define SRE_CHAR Py_UCS2
#define SIZEOF_SRE_CHAR 2
#define SRE(F) sre_ucs2_##F
#include "sre_lib.h"
/* generate 32-bit unicode version */
#define SRE_CHAR Py_UCS4
#define SIZEOF_SRE_CHAR 4
#define SRE(F) sre_ucs4_##F
#include "sre_lib.h"
/* -------------------------------------------------------------------- */
/* factories and destructors */
/* module state */
typedef struct {
PyTypeObject *Pattern_Type;
PyTypeObject *Match_Type;
PyTypeObject *Scanner_Type;
} _sremodulestate;
static _sremodulestate *
get_sre_module_state(PyObject *m)
{
_sremodulestate *state = (_sremodulestate *)_PyModule_GetState(m);
assert(state);
return state;
}
static struct PyModuleDef sremodule;
#define get_sre_module_state_by_class(cls) \
(get_sre_module_state(PyType_GetModule(cls)))
/* see sre.h for object declarations */
static PyObject*pattern_new_match(_sremodulestate *, PatternObject*, SRE_STATE*, Py_ssize_t);
static PyObject *pattern_scanner(_sremodulestate *, PatternObject *, PyObject *, Py_ssize_t, Py_ssize_t);
/*[clinic input]
module _sre
class _sre.SRE_Pattern "PatternObject *" "get_sre_module_state_by_class(tp)->Pattern_Type"
class _sre.SRE_Match "MatchObject *" "get_sre_module_state_by_class(tp)->Match_Type"
class _sre.SRE_Scanner "ScannerObject *" "get_sre_module_state_by_class(tp)->Scanner_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=fe2966e32b66a231]*/
/*[clinic input]
_sre.getcodesize -> int
[clinic start generated code]*/
static int
_sre_getcodesize_impl(PyObject *module)
/*[clinic end generated code: output=e0db7ce34a6dd7b1 input=bd6f6ecf4916bb2b]*/
{
return sizeof(SRE_CODE);
}
/*[clinic input]
_sre.ascii_iscased -> bool
character: int
/
[clinic start generated code]*/
static int
_sre_ascii_iscased_impl(PyObject *module, int character)
/*[clinic end generated code: output=4f454b630fbd19a2 input=9f0bd952812c7ed3]*/
{
unsigned int ch = (unsigned int)character;
return ch < 128 && Py_ISALPHA(ch);
}
/*[clinic input]
_sre.unicode_iscased -> bool
character: int
/
[clinic start generated code]*/
static int
_sre_unicode_iscased_impl(PyObject *module, int character)
/*[clinic end generated code: output=9c5ddee0dc2bc258 input=51e42c3b8dddb78e]*/
{
unsigned int ch = (unsigned int)character;
return ch != sre_lower_unicode(ch) || ch != sre_upper_unicode(ch);
}
/*[clinic input]
_sre.ascii_tolower -> int
character: int
/
[clinic start generated code]*/
static int
_sre_ascii_tolower_impl(PyObject *module, int character)
/*[clinic end generated code: output=228294ed6ff2a612 input=272c609b5b61f136]*/
{
return sre_lower_ascii(character);
}
/*[clinic input]
_sre.unicode_tolower -> int
character: int
/
[clinic start generated code]*/
static int
_sre_unicode_tolower_impl(PyObject *module, int character)
/*[clinic end generated code: output=6422272d7d7fee65 input=91d708c5f3c2045a]*/
{
return sre_lower_unicode(character);
}
LOCAL(void)
state_reset(SRE_STATE* state)
{
/* state->mark will be set to 0 in SRE_OP_MARK dynamically. */
/*memset(state->mark, 0, sizeof(*state->mark) * SRE_MARK_SIZE);*/
state->lastmark = -1;
state->lastindex = -1;
state->repeat = NULL;
data_stack_dealloc(state);
}
static const void*
getstring(PyObject* string, Py_ssize_t* p_length,
int* p_isbytes, 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) */
/* 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;
*p_length = PyUnicode_GET_LENGTH(string);
*p_charsize = PyUnicode_KIND(string);
*p_isbytes = 0;
return PyUnicode_DATA(string);
}
/* get pointer to byte string buffer */
if (PyObject_GetBuffer(string, view, PyBUF_SIMPLE) != 0) {
PyErr_SetString(PyExc_TypeError, "expected string or bytes-like object");
return NULL;
}
*p_length = view->len;
*p_charsize = 1;
*p_isbytes = 1;
if (view->buf == NULL) {
PyErr_SetString(PyExc_ValueError, "Buffer is NULL");
PyBuffer_Release(view);
view->buf = NULL;
return NULL;
}
return view->buf;
}
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 isbytes, charsize;
const void* ptr;
memset(state, 0, sizeof(SRE_STATE));
state->mark = PyMem_New(const void *, pattern->groups * 2);
if (!state->mark) {
PyErr_NoMemory();
goto err;
}
state->lastmark = -1;
state->lastindex = -1;
state->buffer.buf = NULL;
ptr = getstring(string, &length, &isbytes, &charsize, &state->buffer);
if (!ptr)
goto err;
if (isbytes && pattern->isbytes == 0) {
PyErr_SetString(PyExc_TypeError,
"cannot use a string pattern on a bytes-like object");
goto err;
}
if (!isbytes && pattern->isbytes > 0) {
PyErr_SetString(PyExc_TypeError,
"cannot 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->isbytes = isbytes;
state->charsize = charsize;
state->match_all = 0;
state->must_advance = 0;
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;
return string;
err:
/* We add an explicit cast here because MSVC has a bug when
compiling C code where it believes that `const void**` cannot be
safely casted to `void*`, see bpo-39943 for details. */
PyMem_Free((void*) state->mark);
state->mark = NULL;
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);
/* See above PyMem_Del for why we explicitly cast here. */
PyMem_Free((void*) state->mark);
state->mark = NULL;
}
/* calculate offset from start of string */
#define STATE_OFFSET(state, member)\
(((char*)(member) - (char*)(state)->beginning) / (state)->charsize)
LOCAL(PyObject*)
getslice(int isbytes, const void *ptr,
PyObject* string, Py_ssize_t start, Py_ssize_t end)
{
if (isbytes) {
if (PyBytes_CheckExact(string) &&
start == 0 && end == PyBytes_GET_SIZE(string)) {
Py_INCREF(string);
return string;
}
return PyBytes_FromStringAndSize(
(const char *)ptr + start, end - start);
}
else {
return PyUnicode_Substring(string, start, end);
}
}
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_RETURN_NONE;
}
} else {
i = STATE_OFFSET(state, state->mark[index]);
j = STATE_OFFSET(state, state->mark[index+1]);
}
return getslice(state->isbytes, state->beginning, string, i, j);
}
static void
pattern_error(Py_ssize_t status)
{
switch (status) {
case SRE_ERROR_RECURSION_LIMIT:
/* This error code seems to be unused. */
PyErr_SetString(
PyExc_RecursionError,
"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 int
pattern_traverse(PatternObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->groupindex);
Py_VISIT(self->indexgroup);
Py_VISIT(self->pattern);
return 0;
}
static int
pattern_clear(PatternObject *self)
{
Py_CLEAR(self->groupindex);
Py_CLEAR(self->indexgroup);
Py_CLEAR(self->pattern);
return 0;
}
static void
pattern_dealloc(PatternObject* self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
if (self->weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject *) self);
}
(void)pattern_clear(self);
tp->tp_free(self);
Py_DECREF(tp);
}
LOCAL(Py_ssize_t)
sre_match(SRE_STATE* state, SRE_CODE* pattern)
{
if (state->charsize == 1)
return sre_ucs1_match(state, pattern, 1);
if (state->charsize == 2)
return sre_ucs2_match(state, pattern, 1);
assert(state->charsize == 4);
return sre_ucs4_match(state, pattern, 1);
}
LOCAL(Py_ssize_t)
sre_search(SRE_STATE* state, SRE_CODE* pattern)
{
if (state->charsize == 1)
return sre_ucs1_search(state, pattern);
if (state->charsize == 2)
return sre_ucs2_search(state, pattern);
assert(state->charsize == 4);
return sre_ucs4_search(state, pattern);
}
/*[clinic input]
_sre.SRE_Pattern.match
cls: defining_class
/
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
Matches zero or more characters at the beginning of the string.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_match_impl(PatternObject *self, PyTypeObject *cls,
PyObject *string, Py_ssize_t pos,
Py_ssize_t endpos)
/*[clinic end generated code: output=ec6208ea58a0cca0 input=4bdb9c3e564d13ac]*/
{
_sremodulestate *module_state = get_sre_module_state_by_class(cls);
SRE_STATE state;
Py_ssize_t status;
PyObject *match;
if (!state_init(&state, (PatternObject *)self, string, pos, endpos))
return NULL;
state.ptr = state.start;
TRACE(("|%p|%p|MATCH\n", PatternObject_GetCode(self), state.ptr));
status = sre_match(&state, PatternObject_GetCode(self));
TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
if (PyErr_Occurred()) {
state_fini(&state);
return NULL;
}
match = pattern_new_match(module_state, self, &state, status);
state_fini(&state);
return match;
}
/*[clinic input]
_sre.SRE_Pattern.fullmatch
cls: defining_class
/
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
Matches against all of the string.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_fullmatch_impl(PatternObject *self, PyTypeObject *cls,
PyObject *string, Py_ssize_t pos,
Py_ssize_t endpos)
/*[clinic end generated code: output=625b75b027ef94da input=50981172ab0fcfdd]*/
{
_sremodulestate *module_state = get_sre_module_state_by_class(cls);
SRE_STATE state;
Py_ssize_t status;
PyObject *match;
if (!state_init(&state, self, string, pos, endpos))
return NULL;
state.ptr = state.start;
TRACE(("|%p|%p|FULLMATCH\n", PatternObject_GetCode(self), state.ptr));
state.match_all = 1;
status = sre_match(&state, PatternObject_GetCode(self));
TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
if (PyErr_Occurred()) {
state_fini(&state);
return NULL;
}
match = pattern_new_match(module_state, self, &state, status);
state_fini(&state);
return match;
}
/*[clinic input]
_sre.SRE_Pattern.search
cls: defining_class
/
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
Scan through string looking for a match, and return a corresponding match object instance.
Return None if no position in the string matches.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_search_impl(PatternObject *self, PyTypeObject *cls,
PyObject *string, Py_ssize_t pos,
Py_ssize_t endpos)
/*[clinic end generated code: output=bd7f2d9d583e1463 input=afa9afb66a74a4b3]*/
{
_sremodulestate *module_state = get_sre_module_state_by_class(cls);
SRE_STATE state;
Py_ssize_t status;
PyObject *match;
if (!state_init(&state, self, string, pos, endpos))
return NULL;
TRACE(("|%p|%p|SEARCH\n", PatternObject_GetCode(self), state.ptr));
status = sre_search(&state, PatternObject_GetCode(self));
TRACE(("|%p|%p|END\n", PatternObject_GetCode(self), state.ptr));
if (PyErr_Occurred()) {
state_fini(&state);
return NULL;
}
match = pattern_new_match(module_state, self, &state, status);
state_fini(&state);
return match;
}
static PyObject*
call(const char* module, const 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;
}
/*[clinic input]
_sre.SRE_Pattern.findall
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
Return a list of all non-overlapping matches of pattern in string.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_findall_impl(PatternObject *self, PyObject *string,
Py_ssize_t pos, Py_ssize_t endpos)
/*[clinic end generated code: output=f4966baceea60aca input=5b6a4ee799741563]*/
{
SRE_STATE state;
PyObject* list;
Py_ssize_t status;
Py_ssize_t i, b, e;
if (!state_init(&state, self, string, pos, endpos))
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;
status = sre_search(&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 = getslice(state.isbytes, state.beginning,
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;
state.must_advance = (state.ptr == state.start);
state.start = state.ptr;
}
state_fini(&state);
return list;
error:
Py_DECREF(list);
state_fini(&state);
return NULL;
}
/*[clinic input]
_sre.SRE_Pattern.finditer
cls: defining_class
/
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
Return an iterator over all non-overlapping matches for the RE pattern in string.
For each match, the iterator returns a match object.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_finditer_impl(PatternObject *self, PyTypeObject *cls,
PyObject *string, Py_ssize_t pos,
Py_ssize_t endpos)
/*[clinic end generated code: output=1791dbf3618ade56 input=812e332a4848cbaf]*/
{
_sremodulestate *module_state = get_sre_module_state_by_class(cls);
PyObject* scanner;
PyObject* search;
PyObject* iterator;
scanner = pattern_scanner(module_state, self, string, pos, endpos);
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;
}
/*[clinic input]
_sre.SRE_Pattern.scanner
cls: defining_class
/
string: object
pos: Py_ssize_t = 0
endpos: Py_ssize_t(c_default="PY_SSIZE_T_MAX") = sys.maxsize
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_scanner_impl(PatternObject *self, PyTypeObject *cls,
PyObject *string, Py_ssize_t pos,
Py_ssize_t endpos)
/*[clinic end generated code: output=f70cd506112f1bd9 input=2e487e5151bcee4c]*/
{
_sremodulestate *module_state = get_sre_module_state_by_class(cls);
return pattern_scanner(module_state, self, string, pos, endpos);
}
/*[clinic input]
_sre.SRE_Pattern.split
string: object
maxsplit: Py_ssize_t = 0
Split string by the occurrences of pattern.
[clinic start generated code]*/
static PyObject *
_sre_SRE_Pattern_split_impl(PatternObject *self, PyObject *string,
Py_ssize_t maxsplit)
/*[clinic end generated code: output=7ac66f381c45e0be input=1eeeb10dafc9947a]*/
{
SRE_STATE state;
PyObject* list;
PyObject* item;
Py_ssize_t status;
Py_ssize_t n;
Py_ssize_t i;
const void* last;
assert(self->codesize != 0);
if (!state_init(&state, self, string, 0, PY_SSIZE_T_MAX))
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;
status = sre_search(&state, PatternObject_GetCode(self));
if (PyErr_Occurred())
goto error;
if (status <= 0) {
if (status == 0)
break;
pattern_error(status);
goto error;
}
/* get segment before this match */
item = getslice(state.isbytes, state.beginning,
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;