<?php

/**
 * Pre-transform that changes converts a boolean attribute to fixed CSS
 */
class HTMLPurifier_AttrTransform_BoolToCSS extends HTMLPurifier_AttrTransform {
	/**
	 * Name of boolean attribute that is trigger.
	 * @type string
	 */
	protected $attr;
	
	/**
	 * CSS declarations to add to style, needs trailing semicolon.
	 * @type string
	 */
	protected $css;
	
	/**
	 *
	 * @param string $attr
	 *        	attribute name to convert from
	 * @param string $css
	 *        	CSS declarations to add to style (needs semicolon)
	 */
	public function __construct($attr, $css) {
		$this->attr = $attr;
		$this->css = $css;
	}
	
	/**
	 *
	 * @param array $attr        	
	 * @param HTMLPurifier_Config $config        	
	 * @param HTMLPurifier_Context $context        	
	 * @return array
	 */
	public function transform($attr, $config, $context) {
		if (! isset ( $attr [$this->attr] )) {
			return $attr;
		}
		unset ( $attr [$this->attr] );
		$this->prependCSS ( $attr, $this->css );
		return $attr;
	}
}

// vim: et sw=4 sts=4