<?php
/**
 * This is the DOM layer to generate XHTML.
 * Inspired by the Wikiwyg DOM layer.
 */
/*
 I decided to differ from the Wikiwyg version due
 mostly to the differences of PHP and JavaScript,
 the biggest one being that creating associative
 arrays in PHP are more than just a pair of braces.
*/

$domDocument = null;
$domElementStack = array();
$domCurElement =& $domDocument;
$domNS = array();

/** Initializes the page.
 */
function initPage() {
  global $domDocument, $domElementStack, $domCurElement;
  $domDocument = new DOMDocument('1.0', 'UTF-8');
  $domElementStack[] =& $domDocument;
  $domCurElement =& $domDocument;
}


/** Adds a namespace
 */
function addNS($name, $url) {
  global $domNS;
  $domNS[$name] = $url;
}


/** Splits a name into the namespace and name.
 * You can use code like this:
 *  list($ns, $tag) = splitName($name);
 */
function splitName($name) {
  $parts = explode(':', $name, 2);
  $value = array();
  if (isset($parts[1])) {
    $value[0] = $parts[0];
    $value[1] = $parts[1];
  } else {
    $value[0] = false;
    $value[1] = $parts[0];
  }
  
  return $value;
}

function dumpstack() {
  global $domElementStack, $domCurElement;
  echo 'Stack {
';
  foreach($domElementStack as $key => $elem) {
    echo "\t";
    var_dump($domElementStack[$key]->nodeName);
  }
  echo '} ';
  echo 'Cur:'."\t";
  var_dump($domCurElement->nodeName);
}

/** The basic element class
 */
class Element {
  private $name, $ns, $lname, $attrs = array();
  private $element, $node;
  
  function __construct() {
    $args = func_get_args();
    if (is_array($args[0])) $args = $args[0];
    
    #Phase 1: parse arguments
    reset($args);
    list($key, $arg) = each($args);
    $tagname = $arg;
    while (list($key, $arg) = each($args)) {
      $aname = $arg;
      list($key, $arg) = each($args);
      $avalue = $arg;
      $this->attrs[$aname] = $avalue;
    }
    
    #phase 1.5: place temporary variables into object vars
    $this->name = $tagname;
    list($this->ns, $this->lname) = splitName($this->name);
    
    #Phase 2: create, initialize, and add DOMElement object
    global $domCurElement, $domDocument, $domElementStack;
    echo '
';
    $this->node =& $domDocument->createElement($this->name);
    dumpstack();
    $this->element =& $domCurElement->appendChild(&$this->node);
    $domElementStack[] =& $this->element;
    $GLOBAL['domCurElement'] =& end($domElementStack);
    dumpstack();
    
    
    foreach ($this->attrs as $name => $value) {
      list($ns, $lname) = splitName($name);
      $domCurElement->setAttribute($name, $value);
    }
    echo 'construct: '.count($domElementStack).'

';
  }
  
  static function end() {
    global $domCurElement, $domDocument, $domElementStack;
    array_pop($domElementStack);
    $domCurElement =& end($domElementStack);
    echo 'end: '.count($domElementStack).PHP_EOL;
  }
  
  static function &add() {
    $args = func_get_args();
    return new Element($args);
    echo 'add: '.count($domElementStack).PHP_EOL;
  }             	
}

function &Element() {
  $args = func_get_args();
  $tag =& new Element($args);
  Element::end();
  return $tag;
}

require_once('xhtml-1.0s.php');
?>