<?php
/**
 * Markup Scanner Handler: Wxml2Xml
 *
 * $Id: Xinha2Xml.php 884 2010-11-11 20:04:23Z gerd $
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package wb
 * @subpackage Markup
 */

WBClass::load('WBMarkup_Handler_Xml2Wxml');

/**
 * Markup Scanner Handler: Wxml2Xml
 *
 * Convert Wxml html data to Wombat XML
 *
 * @version 0.1.0
 * @package wb
 * @subpackage Markup
 */
class WBMarkup_Handler_Wxml2Xml extends WBMarkup_Handler_Xml2Wxml
{
    /**
     * Cunstructor
     *
     * Flip mapping array
     */
    public function __construct()
    {
        $this->stdTagMap    =   array_flip($this->stdTagMap);
    }
    
   /**
    * Handler on start element
    *
    * @param string $ns The used namespace, if set. otherwise null
    * @param string $tag the tag itself
    * @param array  $attributes the attributes of the found element
    * @param bool $isEmpty true if it is a start- and closing-Element (e.g. <br />)
    * @return bool usually true, false to stop the scanner
    */
    public function onStartElement($ns, $tag, $attributes, $isEmpty)
    {
        if (empty($ns)) {
            if (isset($this->stdTagMap[$tag])) {
                $tag    =   $this->stdTagMap[$tag];            
            }
            if (isset($attributes['wb:dialog'])) {
                $ns     =   'wb';
                $tag    =   $attributes['wb:dialog'];
            }
        }
        
        return parent::onStartElement($ns, $tag, $attributes, $isEmpty);
    }

    /**
     * Convert node
     *
     * transform namespaced tags to HTML
     *
     * @todo convert empty namespace (standard HTML) to known WB namespace, if possible
     * @param string $ns
     * @param string $tag
     * @param array $node
     */
    protected function convert($ns, $tag, &$node)
    {
        $con    =   $this->getConverter($ns, $tag);
        if (!$con) {
            return '';
        }
        return $con->toXml($node);
    }
    
   /**
    * Serialize document node
    * 
    * Strip nodes with whitespace content only. Clean up rubish from WYSIWIG editor.
    *
    * @param array $node
    * @return string serialized attributes
    */
    protected function node2String($node)
    {
        if ($node['isEmpty']) {
            return parent::node2String($node);            
        }
        
        if (!empty($node['ns'])) {
            return parent::node2String($node);
        }
        
        
        // strip BR-Tags bofore closing tag
        $end    =   end($node['cData']);
        if ('<br />' == $end) {
            array_pop($node['cData']);
        }
        
        // empty cData?
        $cData  =   trim(implode("\n", $node['cData']));
        if (0 == strlen($cData)) {
            return '';
        }
        return parent::node2String($node);
    }
    
}