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tagtrack.php

my HTML parser class uses this class to check the validity of nested tags. Parser.php needs this class to work.

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Source Code ( 48 lines )

<?

$tag_stack = array();

class TagTrack
  {
        var $label;
        var $top_level;
        var $follower;

        function TagTrack ($label, $top_level = 1, $followers = 0)
          {
                $this->label = $label;
                $this->top_level = $top_level;
                $this->followers = $followers;
          }

        function VerifyTag ($closing)
          {
                global $tag_stack;

                $prev=end($tag_stack);
		if ($closing)
		  {
			if ($this->label = $prev->label)
			  {
				array_pop ($tag_stack);
				return ($this->label);
			  }
			else return (0);
		  }

		if ($prev && $pf = $prev->followers)
		  {
			if (is_array ($pf) && !in_array ($this->label, $pf)) 
				return (0);
			elseif ($pf == "*" && !$this->top_level)
				return (0);
		  }

		if ($this->followers)
			array_push ($tag_stack, $this);

		return ($this->label);
          }
  }

?>