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Created: Thu, Jun 26, 2:56 AM

xml_helper.php
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	<?php

	class kXMLHelper extends kHelper {
	var $RootElement = null;

	/**
	* Enter description here...
	*
	* @var kXMLNode
	*/
	var $CurrentElement = null;

	/**
	* Parses XML data specified and returns root node
	*
	* @param string $xml
	* @return kXMLNode
	*/
	function &Parse($xml = null)
	{
	$this->Clear(); // in case if Parse method is called more then one time
	$xml_parser = xml_parser_create();
	xml_set_element_handler( $xml_parser, Array(&$this, 'startElement'), Array(&$this, 'endElement') );
	xml_set_character_data_handler( $xml_parser, Array(&$this, 'characterData') );
	if (!xml_parse($xml_parser, $xml, 1)) {
	$this->RootElement = new kXMLNode('ERROR', array('code'=>xml_get_error_code($xml_parser),'message'=>xml_error_string(xml_get_error_code($xml_parser))));
	trigger_error(sprintf('XML error: %s at line %d',
	xml_error_string(xml_get_error_code($xml_parser)),
	xml_get_current_line_number($xml_parser)), E_USER_WARNING);
	}
	xml_parser_free($xml_parser);

	$root_copy = $this->RootElement;

	return $root_copy;
	}

	function startElement(&$Parser, &$Elem, $Attrs)
	{
	$parent =& $this->CurrentElement; // 1. $parent is now reference to $this->CurrentElement
	$this->CurrentElement =& new kXMLNode($Elem, $Attrs); // 2. =& ensures, that new object won't be assigned to $parent as well (don't remove)
	if (!isset($this->RootElement) \|\| is_null($this->RootElement)) {
	$this->RootElement =& $this->CurrentElement;
	}
	if (!is_null($parent)) {
	$parent->AddChild($this->CurrentElement);
	}
	}

	function characterData($Parser, $Line)
	{
	$this->CurrentElement->AppendData($Line);
	}

	function endElement($Parser, $Elem)
	{
	if ($this->CurrentElement->Parent != null) {
	$this->CurrentElement =& $this->CurrentElement->Parent;
	}
	}

	function Clear()
	{
	unset($this->RootElement);
	unset($this->CurrentElement);
	}
	}

	class kXMLNode {
	var $Name = null;
	var $Attributes = array();
	var $Children = array();
	var $Data = null;

	var $firstChild = null;
	var $lastChild = null;
	/**
	* Parent node
	*
	* @var kXMLNode
	*/
	var $Parent = null;
	/**
	* Node position relative to other nodes of it's parent
	*
	* @var int
	*/
	var $Position = 0;

	function kXMLNode($name, $attrs = array())
	{
	$this->Name = $name;
	$this->Attributes = $attrs;
	}

	function SetParent(&$elem)
	{
	$this->Parent =& $elem;
	}

	/**
	* Adds new child to current node
	*
	* @param kXMLNode $a_child
	*/
	function AddChild(&$a_child)
	{
	$node_count = count($this->Children);
	$a_child->Position = $node_count;

	if ($node_count == 0) {
	$this->firstChild =& $a_child;
	$this->lastChild =& $a_child;
	}
	else {
	$this->lastChild =& $a_child;
	}

	$this->Children[] =& $a_child;
	$a_child->SetParent($this);
	}

	function AppendData($data)
	{
	$this->Data .= $data;
	}

	function &GetChild($path)
	{
	$entries = explode('/', strtoupper($path));
	$cur = array_shift($entries);
	if ($cur == $this->Name) $cur = array_shift($entries);
	if (!$cur) return $this;
	if (!isset($this->Children[$cur])) return false;
	$left = implode('/', $entries);
	if (!$left) return $this->Children[$cur];
	return $this->Children[$cur]->GetChild($left);
	}

	function GetChildValue($path)
	{
	$child =& $this->GetChild($path);
	if ($child !== false) {
	return $child->Data;
	}
	}

	function &GetChildByPosition($position)
	{
	if ($position < count($this->Children) ) {
	return $this->Children[$position];
	}
	else {
	$false = false;
	return $false;
	}
	}

	function &FindChild($name)
	{
	$name = strtoupper($name);
	if ($this->Name == $name) return $this;
	// if (isset($this->Children[$name])) return $this->Children[$name];
	// $children = array_keys($this->Children);
	foreach ($this->Children as $elem)
	{
	$child =& $elem->FindChild($name);
	if ($child !== false)
	{
	return $child;
	}
	}
	$false = false;
	return $false;
	}

	function FindChildValue($name, $attr=null)
	{
	$child =& $this->FindChild($name);
	if ($child !== false) {
	if (isset($attr)) {
	return $child->Attributes[strtoupper($attr)];
	}
	return $child->Data;
	}
	}

	/**
	* Returns next node to this, false in case of end list
	*
	* @return kXMLNode
	*/
	function &NextSibling()
	{
	if (!is_null($this->Parent)) {
	$ret =& $this->Parent->GetChildByPosition($this->Position + 1);
	return $ret;
	}
	else {
	$false = false;
	return $false;
	}
	}
	/**
	* Reconstructs XML of the node and subnodes
	*
	* $param bool $content_only
	*/
	function GetXML($content_only = false)
	{
	$xml = '';
	if (!$content_only) {
	$xml = '<'.$this->Name;
	if (count($this->Attributes)) {
	$xml .= ' ';
	$att_contents = array();
	foreach ($this->Attributes as $name => $value) {
	$att_contents[] = $name.'="'.$value.'"';
	}
	$xml .= implode(' ', $att_contents);
	}
	$xml .= '>';
	}
	$xml .= $this->Data;
	foreach ($this->Children as $node) {
	$xml .= $node->GetXML();
	}

	if (!$content_only) {
	$xml .= '</'.$this->Name.'>';
	}
	return $xml;
	}
	}

	?>

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