<?php

/**
 * Pre-transform that changes proprietary background attribute to CSS.
 */
class HTMLPurifier_AttrTransform_Background extends HTMLPurifier_AttrTransform {
	/**
	 *
	 * @param array $attr        	
	 * @param HTMLPurifier_Config $config        	
	 * @param HTMLPurifier_Context $context        	
	 * @return array
	 */
	public function transform($attr, $config, $context) {
		if (! isset ( $attr ['background'] )) {
			return $attr;
		}
		
		$background = $this->confiscateAttr ( $attr, 'background' );
		// some validation should happen here
		
		$this->prependCSS ( $attr, "background-image:url($background);" );
		return $attr;
	}
}

// vim: et sw=4 sts=4