<?php

$depth = array();
$specificXMLParser;

interface XMLElementHandler {
	public function getHandlerForNewElement( $name );
	public function setAttributes( $attributes );
	public function processData( $data );
	public function close();
	public function notify( $childHandler );
}

interface XMLParser {
	public function startElement( $parser, $name, $attributes );
	public function characterData( $parser, $data );
	public function endElement( $parser );
}

class BaseXMLParser implements XMLParser {
	public $stack;
	
	public function __construct() {
		$this->stack = array();
	}
	
	public function startElement( $parser, $name, $attributes ) {
		$handler = end( $this->stack )->getHandlerForNewElement( $name );
		$handler->setAttributes( $attributes );
		$this->stack[] = $handler;
	}
	
	public function characterData( $parser, $data ) {
		end( $this->stack )->processData( $data );
	}
	
	public function endElement( $parser ) {
		$handler = array_pop( $this->stack );
		$handler->close();
		
		if ( count( $this->stack ) > 0 )
			end( $this->stack )->notify( $handler );
	}
}

class DefaultXMLElementHandler implements XMLElementHandler {
	public $name;
	public $attributes;
	public $data = "";
	
	public function getHandlerForNewElement( $name ) {
		$result = new DefaultXMLElementHandler();
		$result->name = $name;
		return $result;
	}
	
	public function setAttributes( $attributes ) {
		$this->attributes = $attributes;
	}
	
	public function processData( $data ) {
		$this->data .= $data;
	}
	
	public function close() {
	}
	
	public function notify( $childHandler ) {
	}
}

class DummyXMLElementHandler implements XMLElementHandler {
	public function getHandlerForNewElement( $name ) {
		return $this;
	}
	
	public function setAttributes( $attributes ) {
	}
	
	public function processData( $data ) {
	}
	
	public function close() {
	}
	
	public function notify( $childHandler ) {
	}
}

// class ChildrenXMLElementHandler implements XMLElementHandler {
//	public $currentChild;
//	public $children;
//	
//	public function __construct() {
//		$this->children = array(); 
//	}
//
//	public function addCurrentChildElementHandler($childName, $childElementHandler) {
//		$this->children[]=$childElementHandler;
//		$this->currentChild = $childElementHandler;
//	}
//	
//	public function closed() {
//		return !($this->currentChild && !$this->currentChild->closed());
//	}
//	
//	public function newElement($childName) {
//		if($this->currentChild && !$this->currentChild->closed()) {
//			return $this->currentChild->newElement($childName);
//		}
//		else {
//			return false;
//		}
//	}
//	
//	public function endElement($name) {
//		if($this->currentChild && !$this->currentChild->closed()){
//			return $this->currentChild->endElement($name);
//		}
//		else {
//			return false;
//		}
//	}
//	
//	public function setAttributes($attributes) {
//		if($this->currentChild && !$this->currentChild->closed()){
//			return $this->currentChild->setAttributes($attributes);
//		}
//		else {
//			return false;
//		}
//	}
//	
//	public function setData($data) {
//		if($this->currentChild && !$this->currentChild->closed()){
//			return $this->currentChild->setData($data);
//		}
//		else {
//			return false;
//		}
//	}
// }
//
// class EmptyXMLElementHandler implements XMLElementHandler {
//	public $name;
//	public $m_closed;
//	
//	public function __construct() {
//		$this->m_closed = false;
//	}
//	
//	public function setAttributes($attributes) {
//		return !$this->closed();
//	}
//	
//	public function closed() {
//		return $this->m_closed;
//	}
//	
//	public function newElement($childName) {
//		return !$this->closed();
//	}
//	
//	public function endElement($name) {
//		if ($this->closed()) {
//			return false;
//		}
//		else {
//			$this->m_closed = ($this->name == $name);
//			return true;	
//		}
//	}
//	
//	public function setData($data) {
//		return !$this->closed();
//	}
// }

function parseXML( $fileHandle, $xmlParser ) {
	$standardXmlParser = xml_parser_create();
	xml_set_element_handler( $standardXmlParser,  array( $xmlParser, "startElement" ), array( $xmlParser, "endElement" ) );
	xml_set_character_data_handler( $standardXmlParser, array( $xmlParser, "characterData" ) );
	
	while ( $data = fread( $fileHandle, 32 * 1024 * 1024 ) ) {
	    if ( !xml_parse( $standardXmlParser, $data, feof( $fileHandle ) ) ) {
	        die( sprintf( "XML error: %s at line %d",
	                    xml_error_string( xml_get_error_code( $standardXmlParser ) ),
	                    xml_get_current_line_number( $standardXmlParser ) ) );
	    }
	}
	xml_parser_free( $standardXmlParser );
}

function startXMLLayout( $parser, $name, $attrs ) {
	global $depth;
	
	for ( $i = 0; $i < $depth[$parser]; $i++ ) {
	    echo "  ";
	}
	echo "$name\n";
	foreach ( $attrs as $key => $value ) {
		for ( $i = 0; $i < $depth[$parser]; $i++ ) {
	   	echo "  ";
		}
		echo "$key = $value\n";
	}
	$depth[$parser]++;
 }

function characterXMLLayout( $parser, $data ) {
	global $depth;
	for ( $i = 0; $i < $depth[$parser]; $i++ ) {
	    echo "  ";
	}
	echo "$data\n";
}

function endXMLLayout( $parser, $name ) {
    global $depth;
    if ( $name == "ENTRY" ) {
    	die( '\nfirst entry end\n' );
    }
    $depth[$parser]--;
}