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 <?php
 
 /**
  * Converts a stream of HTMLPurifier_Token into an HTMLPurifier_Node,
  * and back again.
  *
  * @note This transformation is not an equivalence.  We mutate the input
  * token stream to make it so; see all [MUT] markers in code.
  */
 class HTMLPurifier_Arborize
 {
     public static function arborize($tokens, $config, $context) {
         $definition = $config->getHTMLDefinition();
         $parent = new HTMLPurifier_Token_Start($definition->info_parent);
         $stack = array($parent->toNode());
         foreach ($tokens as $token) {
             $token->skip = null; // [MUT]
             $token->carryover = null; // [MUT]
             if ($token instanceof HTMLPurifier_Token_End) {
                 $token->start = null; // [MUT]
                 $r = array_pop($stack);
                 //assert($r->name === $token->name);
                 //assert(empty($token->attr));
                 $r->endCol = $token->col;
                 $r->endLine = $token->line;
                 $r->endArmor = $token->armor;
                 continue;
             }
             $node = $token->toNode();
             $stack[count($stack)-1]->children[] = $node;
             if ($token instanceof HTMLPurifier_Token_Start) {
                 $stack[] = $node;
             }
         }
         //assert(count($stack) == 1);
         return $stack[0];
     }
 
     public static function flatten($node, $config, $context) {
         $level = 0;
         $nodes = array($level => new HTMLPurifier_Queue(array($node)));
         $closingTokens = array();
         $tokens = array();
         do {
             while (!$nodes[$level]->isEmpty()) {
                 $node = $nodes[$level]->shift(); // FIFO
                 list($start, $end) = $node->toTokenPair();
                 if ($level > 0) {
                     $tokens[] = $start;
                 }
                 if ($end !== NULL) {
                     $closingTokens[$level][] = $end;
                 }
                 if ($node instanceof HTMLPurifier_Node_Element) {
                     $level++;
                     $nodes[$level] = new HTMLPurifier_Queue();
                     foreach ($node->children as $childNode) {
                         $nodes[$level]->push($childNode);
                     }
                 }
             }
             $level--;
             if ($level && isset($closingTokens[$level])) {
                 while ($token = array_pop($closingTokens[$level])) {
                     $tokens[] = $token;
                 }
             }
         } while ($level > 0);
         return $tokens;
     }
 }