<?php

/**
 * Pre-transform that changes deprecated hspace and vspace attributes to CSS
 */
class HTMLPurifier_AttrTransform_ImgSpace extends HTMLPurifier_AttrTransform {
	/**
	 * @type string
	 */
	protected $attr;
	
	/**
	 * @type array
	 */
	protected $css = array (
			'hspace' => array (
					'left',
					'right' 
			),
			'vspace' => array (
					'top',
					'bottom' 
			) 
	);
	
	/**
	 *
	 * @param string $attr        	
	 */
	public function __construct($attr) {
		$this->attr = $attr;
		if (! isset ( $this->css [$attr] )) {
			trigger_error ( htmlspecialchars ( $attr ) . ' is not valid space attribute' );
		}
	}
	
	/**
	 *
	 * @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;
		}
		
		$width = $this->confiscateAttr ( $attr, $this->attr );
		// some validation could happen here
		
		if (! isset ( $this->css [$this->attr] )) {
			return $attr;
		}
		
		$style = '';
		foreach ( $this->css [$this->attr] as $suffix ) {
			$property = "margin-$suffix";
			$style .= "$property:{$width}px;";
		}
		$this->prependCSS ( $attr, $style );
		return $attr;
	}
}

// vim: et sw=4 sts=4