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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.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: Niels Dossche <nielsdos@php.net> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "php.h"
#if defined(HAVE_LIBXML) && defined(HAVE_DOM)
#include "infra.h"
/* https://infra.spec.whatwg.org/#ascii-whitespace */
const char *ascii_whitespace = "\x09\x0A\x0C\x0D\x20";
/* https://infra.spec.whatwg.org/#strip-and-collapse-ascii-whitespace */
zend_string *dom_strip_and_collapse_ascii_whitespace(zend_string *input)
{
if (input == zend_empty_string) {
return input;
}
ZEND_ASSERT(!ZSTR_IS_INTERNED(input));
ZEND_ASSERT(GC_REFCOUNT(input) == 1);
char *write_ptr = ZSTR_VAL(input);
const char *start = ZSTR_VAL(input);
const char *current = start;
const char *end = current + ZSTR_LEN(input);
current += strspn(current, ascii_whitespace);
while (current < end) {
/* Copy non-whitespace */
size_t non_whitespace_len = strcspn(current, ascii_whitespace);
/* If the pointers are equal, we still haven't encountered collapsable or strippable whitespace. */
if (write_ptr != current) {
memmove(write_ptr, current, non_whitespace_len);
}
current += non_whitespace_len;
write_ptr += non_whitespace_len;
/* Skip whitespace */
current += strspn(current, ascii_whitespace);
if (current < end) {
/* Only make a space when we're not yet at the end of the input, because that means more non-whitespace
* input is to come. */
*write_ptr++ = ' ';
}
}
*write_ptr = '\0';
size_t len = write_ptr - start;
if (len != ZSTR_LEN(input)) {
return zend_string_truncate(input, len, false);
} else {
/* Forget the hash value since we may have transformed non-space-whitespace into spaces. */
zend_string_forget_hash_val(input);
return input;
}
}
#endif /* HAVE_LIBXML && HAVE_DOM */
|
