| /* | |
| +----------------------------------------------------------------------+ | |
| | 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> | | |
| +----------------------------------------------------------------------+ | |
| */ | |
| /* 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 collapsible 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; | |
| } | |
| } | |