<?php

/**
 * Decorator that, depending on a token, switches between two definitions.
 */
class HTMLPurifier_AttrDef_Switch {
	
	/**
	 * @type string
	 */
	protected $tag;
	
	/**
	 * @type HTMLPurifier_AttrDef
	 */
	protected $withTag;
	
	/**
	 * @type HTMLPurifier_AttrDef
	 */
	protected $withoutTag;
	
	/**
	 *
	 * @param string $tag
	 *        	Tag name to switch upon
	 * @param HTMLPurifier_AttrDef $with_tag
	 *        	Call if token matches tag
	 * @param HTMLPurifier_AttrDef $without_tag
	 *        	Call if token doesn't match, or there is no token
	 */
	public function __construct($tag, $with_tag, $without_tag) {
		$this->tag = $tag;
		$this->withTag = $with_tag;
		$this->withoutTag = $without_tag;
	}
	
	/**
	 *
	 * @param string $string        	
	 * @param HTMLPurifier_Config $config        	
	 * @param HTMLPurifier_Context $context        	
	 * @return bool|string
	 */
	public function validate($string, $config, $context) {
		$token = $context->get ( 'CurrentToken', true );
		if (! $token || $token->name !== $this->tag) {
			return $this->withoutTag->validate ( $string, $config, $context );
		} else {
			return $this->withTag->validate ( $string, $config, $context );
		}
	}
}

// vim: et sw=4 sts=4