<?php
class XMLVisitor extends FormositeVisitor {
	
    private $dom;
    private $elementStack = array();
    private $current_level = 0;

    public function __construct()
    {
        
    }
    
	public function visitFormosite(Formosite $comp, $level)
	{
		$this->dom = new DOMDocument('1.0', 'UTF-8');
        $element = $this->dom->createElement('Formosite');
        $element->setAttribute('id', $comp->getId());
        $element->setAttribute('path', $comp->getPath());
        $element->setAttribute('name', $comp->name);
        $element->setAttribute('title', $comp->title);
        $element->setAttribute('linkedForm', $comp->linkedForm);
        $this->dom->appendChild($element);
        array_push($this->elementStack, $element);
    }
    
	public function visitPage(Page $comp, $level)
	{
        $el = $this->dom->createElement('Page');
        $el->setAttribute('id', $comp->getId());
        $el->setAttribute('path', $comp->getPath());
        $el->setAttribute('title', $comp->title);
        $parent = $this->handleParent($el, $level);
        $parent->appendChild($el);
    }
    
	public function visitField(Field $comp, $level)
	{
        $el = $this->dom->createElement('Field');
        $el->setAttribute('id', $comp->getId());
        $el->setAttribute('path', $comp->getPath());     
        $el->setAttribute('label', $comp->label);
        $el->setAttribute('type', $comp->type);
        $el->setAttribute('name', $comp->name);        
        $el->setAttribute('value', $comp->value);
        $el->setAttribute('class', $comp->class);
        $el->setAttribute('info', $comp->info);
        $el->setAttribute('validIf', $comp->validIf);
        $el->setAttribute('okValues', $comp->okValues);
        $el->setAttribute('required', $comp->required);
        $el->setAttribute('disabled', $comp->disabled);
        $el->setAttribute('toBeSaved', $comp->toBeSaved);
        $el->setAttribute('infobulle', $comp->infobulle);
        
        $parent = $this->handleParent($el, $level);
        $parent->appendChild($el);
    }
    
    function visitBlock(Block $comp, $level)
	{
    	return true;
    }
    
	public function handleParent(DomElement $child, $level)
	{
        $parent;
        if ($level > $this->current_level) {
            // child: add to stack
            $parent = $this->elementStack[count($this->elementStack) - 1];
            array_push($this->elementStack, $child);
        } elseif ($level == $this->current_level) {
            // sibling: remove previous element and add child
            array_pop($this->elementStack);
            $parent = $this->elementStack[count($this->elementStack) - 1];
            array_push($this->elementStack, $child);
        } elseif ($level < $this->current_level) {
            // ancestor: remove current and intervening elements
            $diff = ($this->current_level - $level) + 1;
            for ($x = 0; $x < $diff; $x++) {
                array_pop($this->elementStack);
            }
            $parent = $this->elementStack[count($this->elementStack) - 1];
            array_push($this->elementStack, $child);
        }
        $this->current_level = $level;
        return $parent;
    }
    
    public function getXML()
    {
		return $this->dom->saveXML();	
    }
    
	public function toFile($file)
    {
    	$this->dom->formatOutput = true;
		return $this->dom->save($file);	
    }
    
    public function XSLTransform($xslfile)
    {
    	$xslt = new XSLTProcessor();
    	$xml = new domDocument();
    	$xml->loadXML($this->dom->saveXML());
    	$xsl = new domDocument();
    	if (file_exists($xslfile)) {
    		$xsl->load($xslfile);
    	} else {
    		return false;
    	}
    	$xslt -> importStylesheet($xsl);
    	return $xslt -> transformToXml($xml);
    }
       
}
?>