mirror of
https://github.com/ezyang/htmlpurifier.git
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75 lines
2.1 KiB
PHP
75 lines
2.1 KiB
PHP
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<?php
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require_once 'HTMLPurifier/ChildDef.php';
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/**
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* Custom validation class, accepts DTD child definitions
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*
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* @warning Currently this class is an all or nothing proposition, that is,
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* it will only give a bool return value.
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* @note This class is currently not used by any code, although it is unit
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* tested.
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*/
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class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
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{
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var $type = 'custom';
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var $allow_empty = false;
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/**
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* Allowed child pattern as defined by the DTD
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*/
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var $dtd_regex;
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/**
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* PCRE regex derived from $dtd_regex
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* @private
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*/
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var $_pcre_regex;
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/**
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* @param $dtd_regex Allowed child pattern from the DTD
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*/
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function HTMLPurifier_ChildDef_Custom($dtd_regex) {
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$this->dtd_regex = $dtd_regex;
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$this->_compileRegex();
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}
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/**
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* Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
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*/
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function _compileRegex() {
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$raw = str_replace(' ', '', $this->dtd_regex);
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if ($raw{0} != '(') {
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$raw = "($raw)";
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}
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$reg = str_replace(',', ',?', $raw);
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$reg = preg_replace('/([#a-zA-Z0-9_.-]+)/', '(,?\\0)', $reg);
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$this->_pcre_regex = $reg;
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}
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function validateChildren($tokens_of_children, $config, &$context) {
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$list_of_children = '';
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$nesting = 0; // depth into the nest
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foreach ($tokens_of_children as $token) {
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if (!empty($token->is_whitespace)) continue;
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$is_child = ($nesting == 0); // direct
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if ($token->type == 'start') {
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$nesting++;
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} elseif ($token->type == 'end') {
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$nesting--;
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}
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if ($is_child) {
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$list_of_children .= $token->name . ',';
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}
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}
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$list_of_children = rtrim($list_of_children, ',');
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$okay =
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preg_match(
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'/^'.$this->_pcre_regex.'$/',
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$list_of_children
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);
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return (bool) $okay;
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}
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}
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?>
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