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php-src/ext/pcre/php_pcre.c
Zeev Suraski c5724cbd14 License update
1999-07-16 13:13:16 +00:00

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/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997, 1998, 1999 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andrey Zmievski <andrey@ispi.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_globals.h"
#if HAVE_PCRE
#include "php_pcre.h"
#include "ext/standard/php3_string.h"
#define PREG_PATTERN_ORDER 0
#define PREG_SET_ORDER 1
#define PREG_REPLACE_EVAL (1<<0)
/* {{{ module definition structures */
unsigned char third_arg_force_ref[] = { 3, BYREF_NONE, BYREF_NONE, BYREF_FORCE };
function_entry pcre_functions[] = {
PHP_FE(preg_match, third_arg_force_ref)
PHP_FE(preg_match_all, third_arg_force_ref)
PHP_FE(preg_replace, NULL)
PHP_FE(preg_split, NULL)
PHP_FE(preg_quote, NULL)
PHP_FE(preg_grep, NULL)
{NULL, NULL, NULL}
};
zend_module_entry pcre_module_entry = {
"PCRE", pcre_functions, php_minit_pcre, php_mshutdown_pcre,
php_rinit_pcre, NULL,
php_info_pcre, STANDARD_MODULE_PROPERTIES
};
/* }}} */
#ifdef ZTS
int pcre_globals_id;
#else
php_pcre_globals pcre_globals;
#endif
static void *php_pcre_malloc(size_t size)
{
return pemalloc(size, 1);
}
static void php_pcre_free(void *ptr)
{
pefree(ptr, 1);
}
static int _php_free_pcre_cache(void *data)
{
pcre_cache_entry *pce = (pcre_cache_entry *) data;
pefree(pce->re, 1);
return 1;
}
#ifdef ZTS
static void _php_pcre_init_globals(php_pcre_globals *pcre_globals)
{
zend_hash_init(&PCRE_G(pcre_cache), 0, NULL, _php_free_pcre_cache, 1);
}
static void _php_pcre_shutdown_globals(php_pcre_globals *pcre_globals)
{
zend_hash_destroy(&PCRE_G(pcre_cache));
}
#endif
/* {{{ void php_info_pcre(ZEND_MODULE_INFO_FUNC_ARGS) */
void php_info_pcre(ZEND_MODULE_INFO_FUNC_ARGS)
{
php3_printf("Perl Compatible Regular Expressions");
php3_printf("<table cellpadding=5>"
"<tr><td>PCRE library version:</td>"
"<td>%s</td></tr>"
"</table>", pcre_version());
}
/* }}} */
/* {{{ int php_minit_pcre(INIT_FUNC_ARGS) */
int php_minit_pcre(INIT_FUNC_ARGS)
{
ELS_FETCH();
#ifdef ZTS
pcre_globals_id = ts_allocate_id(
sizeof(php_pcre_globals),
_php_pcre_init_globals,
_php_pcre_shutdown_globals);
#else
zend_hash_init(&PCRE_G(pcre_cache), 0, NULL, _php_free_pcre_cache, 1);
#endif
REGISTER_LONG_CONSTANT("PREG_PATTERN_ORDER", PREG_PATTERN_ORDER, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_SET_ORDER", PREG_SET_ORDER, CONST_CS | CONST_PERSISTENT);
return SUCCESS;
}
/* }}} */
/* {{{ int php_mshutdown_pcre(void) */
int php_mshutdown_pcre(SHUTDOWN_FUNC_ARGS)
{
#ifndef ZTS
zend_hash_destroy(&PCRE_G(pcre_cache));
#endif
return SUCCESS;
}
/* }}} */
/* {{{ int php_rinit_pcre(INIT_FUNC_ARGS) */
int php_rinit_pcre(INIT_FUNC_ARGS)
{
pcre_malloc = php_pcre_malloc;
pcre_free = php_pcre_free;
return SUCCESS;
}
/* }}} */
/* {{{ static pcre* _pcre_get_compiled_regex(char *regex, pcre_extra *extra) */
static pcre* _pcre_get_compiled_regex(char *regex, pcre_extra *extra, int *preg_options) {
pcre *re = NULL;
int coptions = 0;
int soptions = 0;
const char *error;
int erroffset;
char delimiter;
char *p, *pp;
char *pattern;
int regex_len;
int do_study = 0;
int poptions = 0;
pcre_cache_entry *pce;
pcre_cache_entry new_entry;
PCRE_LS_FETCH();
/* Try to lookup the cached regex entry, and if successful, just pass
back the compiled pattern, otherwise go on and compile it. */
regex_len = strlen(regex);
if (zend_hash_find(&PCRE_G(pcre_cache), regex, regex_len+1, (void **)&pce) == SUCCESS) {
extra = pce->extra;
*preg_options = pce->preg_options;
return pce->re;
}
p = regex;
/* Parse through the leading whitespace, and display a warning if we
get to the end without encountering a delimiter. */
while (isspace((int)*p)) p++;
if (*p == 0) {
zend_error(E_WARNING, "Empty regular expression");
return NULL;
}
/* Get the delimiter and display a warning if it is alphanumeric
or a backslash. */
delimiter = *p++;
if (isalnum((int)delimiter) || delimiter == '\\') {
zend_error(E_WARNING, "Delimiter must not be alphanumeric or backslash");
return NULL;
}
/* We need to iterate through the pattern, searching for the ending delimiter,
but skipping the backslashed delimiters. If the ending delimiter is not
found, display a warning. */
pp = p;
while (*pp != 0) {
if (*pp == delimiter && pp[-1] != '\\')
break;
pp++;
}
if (*pp == 0) {
zend_error(E_WARNING, "No ending delimiter found");
return NULL;
}
/* Make a copy of the actual pattern. */
pattern = estrndup(p, pp-p);
/* Move on to the options */
pp++;
/* Clear out preg options */
*preg_options = 0;
/* Parse through the options, setting appropriate flags. Display
a warning if we encounter an unknown option. */
while (*pp != 0) {
switch (*pp++) {
/* Perl compatible options */
case 'i': coptions |= PCRE_CASELESS; break;
case 'm': coptions |= PCRE_MULTILINE; break;
case 's': coptions |= PCRE_DOTALL; break;
case 'x': coptions |= PCRE_EXTENDED; break;
/* PCRE specific options */
case 'A': coptions |= PCRE_ANCHORED; break;
case 'D': coptions |= PCRE_DOLLAR_ENDONLY;break;
case 'S': do_study = 1; break;
case 'U': coptions |= PCRE_UNGREEDY; break;
case 'X': coptions |= PCRE_EXTRA; break;
/* Custom preg options */
case 'e': poptions |= PREG_REPLACE_EVAL; break;
case ' ':
case '\n':
break;
default:
zend_error(E_WARNING, "Unknown option '%c'", pp[-1]);
efree(pattern);
return NULL;
}
}
/* Compile pattern and display a warning if compilation failed. */
re = pcre_compile(pattern,
coptions,
&error,
&erroffset,
NULL);
if (re == NULL) {
zend_error(E_WARNING, "Compilation failed: %s at offset %d\n", error, erroffset);
efree(pattern);
return NULL;
}
/* If study option was specified, study the pattern and
store the result in extra for passing to pcre_exec. */
if (do_study) {
extra = pcre_study(re, soptions, &error);
if (error != NULL) {
zend_error(E_WARNING, "Error while studying pattern");
}
}
*preg_options = poptions;
efree(pattern);
/* Store the compiled pattern and extra info in the cache. */
new_entry.re = re;
new_entry.extra = extra;
new_entry.preg_options = poptions;
zend_hash_update(&PCRE_G(pcre_cache), regex, regex_len+1, (void *)&new_entry,
sizeof(pcre_cache_entry), NULL);
return re;
}
/* }}} */
/* {{{ void _pcre_match(INTERNAL_FUNCTION_PARAMETERS, int global) */
static void _pcre_match(INTERNAL_FUNCTION_PARAMETERS, int global)
{
zval *regex, /* Regular expression */
*subject, /* String to match against */
*subpats = NULL, /* Array for subpatterns */
*subpats_order, /* Order of the results in the subpatterns
array for global match */
*result_set, /* Holds a set of subpatterns after
a global match */
**match_sets = NULL; /* An array of sets of matches for each
subpattern after a global match */
pcre *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int exoptions = 0; /* Execution options */
int preg_options = 0; /* Custom preg options */
int count = 0; /* Count of matched subpatterns */
int *offsets; /* Array of subpattern offsets */
int num_subpats; /* Number of captured subpatterns */
int size_offsets; /* Size of the offsets array */
int matched; /* Has anything matched */
int i;
int subpats_order_val = 0; /* Integer value of subpats_order */
const char **stringlist; /* Used to hold list of subpatterns */
char *match, /* The current match */
*piece, /* The current piece of subject */
*subject_end; /* Points to the end of the subject */
/* Get function parameters and do error-checking. */
switch(ARG_COUNT(ht)) {
case 2:
if (getParameters(ht, 2, &regex, &subject) == FAILURE) {
WRONG_PARAM_COUNT;
}
break;
case 3:
if (getParameters(ht, 3, &regex, &subject, &subpats) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (global)
subpats_order_val = PREG_PATTERN_ORDER;
if (!ParameterPassedByReference(ht, 3)) {
zend_error(E_WARNING, "Array to be filled with matches must be passed by reference.");
RETURN_FALSE;
}
break;
case 4:
if (getParameters(ht, 4, &regex, &subject, &subpats, &subpats_order) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (!ParameterPassedByReference(ht, 3)) {
zend_error(E_WARNING, "Array to be filled with matches must be passed by reference.");
RETURN_FALSE;
}
/* Make sure subpats_order is a number */
convert_to_long(subpats_order);
subpats_order_val = subpats_order->value.lval;
if (subpats_order_val < PREG_PATTERN_ORDER ||
subpats_order_val > PREG_SET_ORDER) {
zend_error(E_WARNING, "Wrong value for parameter 4 in call to preg_match_all()");
}
break;
default:
WRONG_PARAM_COUNT;
}
/* Make sure we're dealing with strings. */
convert_to_string(regex);
convert_to_string(subject);
/* Make sure to clean up the passed array and initialize it. */
if (subpats != NULL) {
zval_dtor(subpats);
array_init(subpats);
}
/* Compile regex or get it from cache. */
if ((re = _pcre_get_compiled_regex(regex->value.str.val, extra, &preg_options)) == NULL) {
RETURN_FALSE;
}
/* Calculate the size of the offsets array, and allocate memory for it. */
num_subpats = pcre_info(re, NULL, NULL) + 1;
size_offsets = num_subpats * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
/* Allocate match sets array and initialize the values */
if (global && subpats_order_val == PREG_PATTERN_ORDER) {
match_sets = (zval **)emalloc(num_subpats * sizeof(zval *));
for (i=0; i<num_subpats; i++) {
match_sets[i] = (zval *)emalloc(sizeof(zval));
array_init(match_sets[i]);
INIT_PZVAL(match_sets[i]);
}
}
/* Start from the beginning of the string */
piece = subject->value.str.val;
subject_end = piece + subject->value.str.len;
match = NULL;
matched = 0;
do {
/* Execute the regular expression. */
count = pcre_exec(re, extra, piece,
subject_end-piece, subject->value.str.val,
(piece==subject->value.str.val ? exoptions : exoptions|PCRE_NOTBOL),
offsets, size_offsets, (piece == match));
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
/* If something has matched */
if (count >= 0) {
matched++;
match = piece + offsets[0];
/* If subpatters array has been passed, fill it in with values. */
if (subpats != NULL) {
/* Try to get the list of substrings and display a warning if failed. */
if (pcre_get_substring_list(piece, offsets, count, &stringlist) < 0) {
efree(offsets);
efree(re);
zend_error(E_WARNING, "Get subpatterns list failed");
return;
}
if (global) { /* global pattern matching */
if (subpats_order_val == PREG_PATTERN_ORDER) {
/* For each subpattern, insert it into the appropriate array */
for (i=0; i<count; i++) {
add_next_index_string(match_sets[i], (char *)stringlist[i], 1);
}
}
else {
/* Allocate the result set array */
result_set = emalloc(sizeof(zval));
array_init(result_set);
INIT_PZVAL(result_set);
/* Add all the subpatterns to it */
for (i=0; i<count; i++) {
add_next_index_string(result_set, (char *)stringlist[i], 1);
}
/* And add it to the output array */
zend_hash_next_index_insert(subpats->value.ht, &result_set,
sizeof(zval *), NULL);
}
}
else { /* single pattern matching */
/* For each subpattern, insert it into the subpatterns array. */
for (i=0; i<count; i++) {
add_next_index_string(subpats, (char *)stringlist[i], 1);
}
}
php_pcre_free((void *) stringlist);
/* Advance to the position right after the last full match */
piece += offsets[1];
}
}
} while (global && count >= 0);
/* Add the match sets to the output array and clean up */
if (global && subpats_order_val == PREG_PATTERN_ORDER) {
for (i=0; i<num_subpats; i++) {
zend_hash_next_index_insert(subpats->value.ht, &match_sets[i], sizeof(zval *), NULL);
}
efree(match_sets);
}
efree(offsets);
RETVAL_LONG(matched);
}
/* }}} */
/* {{{ proto preg_match(string pattern, string subject [, array subpatterns ])
Perform a Perl-style regular expression match */
PHP_FUNCTION(preg_match)
{
_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto preg_match_all(string pattern, string subject, array subpatterns [, int order ])
Perform a Perl-style global regular expression match */
PHP_FUNCTION(preg_match_all)
{
_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/* {{{ int _preg_get_backref(const char *walk, int *backref) */
static int _preg_get_backref(const char *walk, int *backref)
{
if (*walk && *walk >= '0' && *walk <= '9')
*backref = *walk - '0';
else
return 0;
if (walk[1] && walk[1] >= '0' && walk[1] <= '9')
*backref = *backref * 10 + walk[1] - '0';
return 1;
}
/* }}} */
/* {{{ int _preg_do_eval(char *eval_str, char *subject, int *offsets,
int count, char **result) */
static int _preg_do_eval(char *eval_str, char *subject, int *offsets,
int count, char **result)
{
zval retval; /* Return value from evaluation */
char backref_buf[4], /* Buffer for string version of backref */
*code, /* PHP code string */
*new_code, /* Code as result of substitution */
*match, /* Current match for a backref */
*walk; /* Used to walk the code string */
int code_len; /* Length of the code string */
int new_code_len; /* Length of the substituted code string */
int match_len; /* Length of the match */
int result_len; /* Length of the result of the evaluation */
int backref; /* Current backref */
CLS_FETCH();
ELS_FETCH();
/* Save string to be evaluated, since we will be modifying it */
code = estrdup(eval_str);
walk = code;
new_code_len = code_len = strlen(code);
while (*walk) {
/* If found a backreference.. */
if ('\\' == *walk &&
_preg_get_backref(walk+1, &backref) &&
backref < count) {
/* Find the corresponding string match and substitute it
in instead of the backref */
match = subject + offsets[backref<<1];
match_len = offsets[(backref<<1)+1] - offsets[backref<<1];
sprintf(backref_buf, "\\%d", backref);
new_code = _php3_str_to_str(code, code_len,
backref_buf, (backref > 9) ? 3 : 2,
match, match_len, &new_code_len);
/* Adjust the walk pointer */
walk = new_code + (walk - code) + match_len;
/* Clean up and reassign */
efree(code);
code = new_code;
code_len = new_code_len;
} else {
walk++;
}
}
/* Run the code */
zend_eval_string(code, &retval CLS_CC ELS_CC);
convert_to_string(&retval);
/* Save the return value and its length */
*result = estrdup(retval.value.str.val);
result_len = retval.value.str.len;
/* Clean up */
zval_dtor(&retval);
efree(code);
return result_len;
}
/* }}} */
/* {{{ char *_php_pcre_replace(char *regex, char *subject, char *replace) */
char *_php_pcre_replace(char *regex, char *subject, char *replace)
{
pcre *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int exoptions = 0; /* Execution options */
int preg_options = 0; /* Custom preg options */
int count = 0; /* Count of matched subpatterns */
int *offsets; /* Array of subpattern offsets */
int size_offsets; /* Size of the offsets array */
int new_len; /* Length of needed storage */
int alloc_len; /* Actual allocated length */
int subject_len; /* Length of the subject string */
int eval_result_len=0; /* Length of the eval'ed string */
int result_len; /* Current length of the result */
int match_len; /* Length of the current match */
int backref; /* Backreference number */
int eval; /* If the replacement string should be eval'ed */
char *result, /* Result of replacement */
*new_buf, /* Temporary buffer for re-allocation */
*walkbuf, /* Location of current replacement in the result */
*walk, /* Used to walk the replacement string */
*match, /* The current match */
*piece, /* The current piece of subject */
*subject_end, /* Points to the end of the subject */
*eval_result; /* Result of eval */
/* Compile regex or get it from cache. */
if ((re = _pcre_get_compiled_regex(regex, extra, &preg_options)) == NULL) {
return NULL;
}
/* Calculate the size of the offsets array, and allocate memory for it. */
size_offsets = (pcre_info(re, NULL, NULL) + 1) * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
subject_len = strlen(subject);
alloc_len = 2 * subject_len + 1;
result = emalloc(alloc_len * sizeof(char));
if (!result) {
zend_error(E_WARNING, "Unable to allocate memory in pcre_replace");
efree(re);
efree(offsets);
return NULL;
}
/* Initialize */
match = NULL;
result[0] = '\0';
piece = subject;
subject_end = subject + subject_len;
eval = preg_options & PREG_REPLACE_EVAL;
while (count >= 0) {
/* Execute the regular expression. */
count = pcre_exec(re, extra, piece,
subject_end-piece, subject,
(piece==subject ? exoptions : exoptions|PCRE_NOTBOL),
offsets, size_offsets, (piece == match));
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
if (count > 0) {
/* Set the match location in piece */
match = piece + offsets[0];
new_len = strlen(result) + offsets[0]; /* part before the match */
/* If evaluating, do it and add the return string's length */
if (eval) {
eval_result_len = _preg_do_eval(replace, piece, offsets,
count, &eval_result);
new_len += eval_result_len;
} else { /* do regular substitution */
walk = replace;
while (*walk)
if ('\\' == *walk &&
_preg_get_backref(walk+1, &backref) &&
backref < count) {
new_len += offsets[(backref<<1)+1] - offsets[backref<<1];
walk += (backref > 9) ? 3 : 2;
} else {
new_len++;
walk++;
}
}
if (new_len + 1 > alloc_len) {
alloc_len = 1 + alloc_len + 2 * new_len;
new_buf = emalloc(alloc_len);
strcpy(new_buf, result);
efree(result);
result = new_buf;
}
result_len = strlen(result);
/* copy the part of the string before the match */
strncat(result, piece, match-piece);
/* copy replacement and backrefs */
walkbuf = &result[result_len + offsets[0]];
/* If evaluating, copy result to the buffer and clean up */
if (eval) {
memcpy(walkbuf, eval_result, eval_result_len);
walkbuf += eval_result_len;
efree(eval_result);
} else { /* do regular backreference copying */
walk = replace;
while (*walk)
if ('\\' == *walk &&
_preg_get_backref(walk+1, &backref) &&
backref < count) {
match_len = offsets[(backref<<1)+1] - offsets[backref<<1];
memcpy (walkbuf,
piece + offsets[backref<<1],
match_len);
walkbuf += match_len;
walk += (backref > 9) ? 3 : 2;
} else
*walkbuf++ = *walk++;
}
*walkbuf = '\0';
/* Advance to the next piece */
piece += offsets[1];
} else {
new_len = strlen(result) + subject_end-piece;
if (new_len + 1 > alloc_len) {
alloc_len = new_len + 1; /* now we know exactly how long it is */
new_buf = emalloc(alloc_len * sizeof(char));
strcpy(new_buf, result);
efree(result);
result = new_buf;
}
/* stick that last bit of string on our output */
strcat(result, piece);
}
}
efree(offsets);
return result;
}
/* }}} */
static char *_php_replace_in_subject(zval *regex, zval *replace, zval *subject)
{
zval **regex_entry_ptr,
*regex_entry,
**replace_entry_ptr,
*replace_entry;
char *replace_value = NULL,
*subject_value,
*result;
/* Make sure we're dealing with strings. */
convert_to_string(subject);
/* If regex is an array */
if (regex->type == IS_ARRAY) {
/* Duplicating subject string for repeated replacement */
subject_value = estrdup(subject->value.str.val);
zend_hash_internal_pointer_reset(regex->value.ht);
if (replace->type == IS_ARRAY)
zend_hash_internal_pointer_reset(replace->value.ht);
else
/* Set replacement value to the passed one */
replace_value = replace->value.str.val;
/* For each entry in the regex array, get the entry */
while (zend_hash_get_current_data(regex->value.ht, (void **)&regex_entry_ptr) == SUCCESS) {
regex_entry = *regex_entry_ptr;
/* Make sure we're dealing with strings. */
convert_to_string(regex_entry);
/* If replace is an array */
if (replace->type == IS_ARRAY) {
/* Get current entry */
if (zend_hash_get_current_data(replace->value.ht, (void **)&replace_entry_ptr) == SUCCESS) {
replace_entry = *replace_entry_ptr;
/* Make sure we're dealing with strings. */
convert_to_string(replace_entry);
/* Set replacement value to the one we got from array */
replace_value = replace_entry->value.str.val;
zend_hash_move_forward(replace->value.ht);
}
else
/* We've run out of replacement strings, so use an empty one */
replace_value = empty_string;
}
/* Do the actual replacement and put the result back into subject_value
for further replacements. */
if ((result = _php_pcre_replace(regex_entry->value.str.val,
subject_value,
replace_value)) != NULL) {
efree(subject_value);
subject_value = result;
}
zend_hash_move_forward(regex->value.ht);
}
return subject_value;
}
else {
/* Make sure we're dealing with strings and do the replacement */
convert_to_string(regex);
convert_to_string(replace);
result = _php_pcre_replace(regex->value.str.val,
subject->value.str.val,
replace->value.str.val);
return result;
}
}
/* {{{ proto preg_replace(string|array regex, string|array replace, string|array subject)
Perform Perl-style regular expression replacement */
PHP_FUNCTION(preg_replace)
{
zval *regex,
*replace,
*subject,
**subject_entry_ptr,
*subject_entry;
char *result;
/* Get function parameters and do error-checking. */
if (ARG_COUNT(ht) != 3 || getParameters(ht, 3, &regex, &replace, &subject) == FAILURE) {
WRONG_PARAM_COUNT;
}
/* if subject is an array */
if (subject->type == IS_ARRAY) {
array_init(return_value);
zend_hash_internal_pointer_reset(subject->value.ht);
/* For each subject entry, convert it to string, then perform replacement
and add the result to the return_value array. */
while (zend_hash_get_current_data(subject->value.ht, (void **)&subject_entry_ptr) == SUCCESS) {
subject_entry = *subject_entry_ptr;
if ((result = _php_replace_in_subject(regex, replace, subject_entry)) != NULL)
add_next_index_string(return_value, result, 0);
zend_hash_move_forward(subject->value.ht);
}
}
else { /* if subject is not an array */
if ((result = _php_replace_in_subject(regex, replace, subject)) != NULL) {
RETVAL_STRING(result, 1);
efree(result);
}
}
}
/* }}} */
/* {{{ proto preg_split(string pattern, string subject [, int limit ]) */
PHP_FUNCTION(preg_split)
{
zval *regex, /* Regular expression to split by */
*subject, /* Subject string to split */
*limit; /* Number of pieces to return */
pcre *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int *offsets; /* Array of subpattern offsets */
int size_offsets; /* Size of the offsets array */
int exoptions = 0; /* Execution options */
int preg_options = 0; /* Custom preg options */
int argc; /* Argument count */
int limit_val; /* Integer value of limit */
int count = 0; /* Count of matched subpatterns */
char *match, /* The current match */
*piece, /* The current piece of subject */
*subject_end; /* Points to the end of subject string */
/* Get function parameters and do error checking */
argc = ARG_COUNT(ht);
if (argc < 1 || argc > 3 || getParameters(ht, argc, &regex, &subject, &limit) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (argc == 3) {
convert_to_long(limit);
limit_val = limit->value.lval;
}
else
limit_val = -1;
/* Make sure we're dealing with strings */
convert_to_string(regex);
convert_to_string(subject);
/* Compile regex or get it from cache. */
if ((re = _pcre_get_compiled_regex(regex->value.str.val, extra, &preg_options)) == NULL) {
RETURN_FALSE;
}
/* Initialize return value */
array_init(return_value);
/* Calculate the size of the offsets array, and allocate memory for it. */
size_offsets = (pcre_info(re, NULL, NULL) + 1) * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
/* Start at the beginning of the string */
piece = subject->value.str.val;
subject_end = piece + subject->value.str.len;
match = NULL;
/* Get next piece if no limit or limit not yet reached and something matched*/
while ((limit_val == -1 || limit_val > 1) && count >= 0) {
count = pcre_exec(re, extra, piece,
subject_end-piece, subject->value.str.val,
(piece==subject->value.str.val ? exoptions : exoptions|PCRE_NOTBOL),
offsets, size_offsets, (piece==match));
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
/* If something matched */
if (count > 0) {
match = piece + offsets[0];
/* Add the piece to the return value */
add_next_index_stringl(return_value,
piece,
offsets[0], 1);
/* Advance to next position */
piece += offsets[1];
/* One less left to do */
if (limit_val != -1)
limit_val--;
}
}
/* Add the last piece to the return value */
add_next_index_stringl(return_value,
piece,
subject_end-piece, 1);
/* Clean up */
efree(offsets);
}
/* }}} */
/* {{{ proto string preg_quote(string str) */
PHP_FUNCTION(preg_quote)
{
zval *in_str_arg; /* Input string argument */
char *in_str, /* Input string */
*out_str, /* Output string with quoted characters */
*p, /* Iterator for input string */
*q, /* Iterator for output string */
c; /* Current character */
/* Get the arguments and check for errors */
if (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &in_str_arg) == FAILURE) {
WRONG_PARAM_COUNT;
}
/* Make sure we're working with strings */
convert_to_string(in_str_arg);
in_str = in_str_arg->value.str.val;
/* Nothing to do if we got an empty string */
if (!*in_str) {
RETVAL_STRING(empty_string, 0);
}
/* Allocate enough memory so that even if each character
is quoted, we won't run out of room */
out_str = emalloc(2 * in_str_arg->value.str.len + 1);
/* Go through the string and quote necessary characters */
for(p = in_str, q = out_str; (c = *p); p++) {
switch(c) {
case '.':
case '\\':
case '+':
case '*':
case '?':
case '[':
case '^':
case ']':
case '$':
case '(':
case ')':
case '{':
case '}':
case '=':
case '!':
case '>':
case '<':
case '|':
case ':':
*q++ = '\\';
/* break is missing _intentionally_ */
default:
*q++ = c;
}
}
*q = '\0';
/* Reallocate string and return it */
RETVAL_STRING(erealloc(out_str, q - out_str + 1), 0);
}
/* }}} */
/* {{{ proto array preg_grep(string regex, array input)
Searches array and returns entries which match regex */
PHP_FUNCTION(preg_grep)
{
zval *regex, /* Regular expression */
*input, /* Input array */
**entry; /* An entry in the input array */
pcre *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int preg_options = 0; /* Custom preg options */
int *offsets; /* Array of subpattern offsets */
int size_offsets; /* Size of the offsets array */
int count = 0; /* Count of matched subpatterns */
char *string_key;
ulong num_key;
/* Get arguments and do error checking */
if (ARG_COUNT(ht) != 2 || getParameters(ht, ARG_COUNT(ht), &regex, &input) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (input->type != IS_ARRAY) {
zend_error(E_WARNING, "Secong argument to preg_grep() should be an array");
return;
}
/* Make sure regex is a string */
convert_to_string(regex);
/* Compile regex or get it from cache. */
if ((re = _pcre_get_compiled_regex(regex->value.str.val, extra, &preg_options)) == NULL) {
RETURN_FALSE;
}
/* Calculate the size of the offsets array, and allocate memory for it. */
size_offsets = (pcre_info(re, NULL, NULL) + 1) * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
/* Initialize return array */
array_init(return_value);
/* Go through the input array */
zend_hash_internal_pointer_reset(input->value.ht);
while(zend_hash_get_current_data(input->value.ht, (void **)&entry) == SUCCESS) {
/* Only match against strings */
if ((*entry)->type == IS_STRING) {
/* Perform the match */
count = pcre_exec(re, extra, (*entry)->value.str.val,
(*entry)->value.str.len, (*entry)->value.str.val,
0, offsets, size_offsets, 0);
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
/* If something matched */
if (count > 0) {
(*entry)->refcount++;
/* Add to return array */
switch(zend_hash_get_current_key(input->value.ht, &string_key, &num_key))
{
case HASH_KEY_IS_STRING:
zend_hash_update(return_value->value.ht, string_key,
strlen(string_key)+1, entry, sizeof(zval *), NULL);
efree(string_key);
break;
case HASH_KEY_IS_LONG:
zend_hash_next_index_insert(return_value->value.ht, entry,
sizeof(zval *), NULL);
break;
}
}
}
zend_hash_move_forward(input->value.ht);
}
efree(offsets);
}
/* }}} */
#endif /* HAVE_PCRE */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
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