File indexing completed on 2024-05-12 06:02:04

 <?php
 
 /**
  * Custom validation class, accepts DTD child definitions
  *
  * @warning Currently this class is an all or nothing proposition, that is,
  *          it will only give a bool return value.
  */
 class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
 {
     /**
      * @type string
      */
     public $type = 'custom';
 
     /**
      * @type bool
      */
     public $allow_empty = false;
 
     /**
      * Allowed child pattern as defined by the DTD.
      * @type string
      */
     public $dtd_regex;
 
     /**
      * PCRE regex derived from $dtd_regex.
      * @type string
      */
     private $_pcre_regex;
 
     /**
      * @param $dtd_regex Allowed child pattern from the DTD
      */
     public function __construct($dtd_regex)
     {
         $this->dtd_regex = $dtd_regex;
         $this->_compileRegex();
     }
 
     /**
      * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
      */
     protected function _compileRegex()
     {
         $raw = str_replace(' ', '', $this->dtd_regex);
         if ($raw{0} != '(') {
             $raw = "($raw)";
         }
         $el = '[#a-zA-Z0-9_.-]+';
         $reg = $raw;
 
         // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
         // DOING! Seriously: if there's problems, please report them.
 
         // collect all elements into the $elements array
         preg_match_all("/$el/", $reg, $matches);
         foreach ($matches[0] as $match) {
             $this->elements[$match] = true;
         }
 
         // setup all elements as parentheticals with leading commas
         $reg = preg_replace("/$el/", '(,\\0)', $reg);
 
         // remove commas when they were not solicited
         $reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
 
         // remove all non-paranthetical commas: they are handled by first regex
         $reg = preg_replace("/,\(/", '(', $reg);
 
         $this->_pcre_regex = $reg;
     }
 
     /**
      * @param HTMLPurifier_Node[] $children
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return bool
      */
     public function validateChildren($children, $config, $context)
     {
         $list_of_children = '';
         $nesting = 0; // depth into the nest
         foreach ($children as $node) {
             if (!empty($node->is_whitespace)) {
                 continue;
             }
             $list_of_children .= $node->name . ',';
         }
         // add leading comma to deal with stray comma declarations
         $list_of_children = ',' . rtrim($list_of_children, ',');
         $okay =
             preg_match(
                 '/^,?' . $this->_pcre_regex . '$/',
                 $list_of_children
             );
         return (bool)$okay;
     }
 }
 
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