<?php
    class XMLNode {
        private $name;
        private $attributes;
        private $childNodes = array();
        private $parentNode;

        function XMLNode( $name, array $attributes, $parent=null ) {
            $this->name = $name;
            $this->attributes = $attributes;
            $this->parentNode = $parent;
        }

        function getParentNode() {
            return $this->parentNode;
        }
        
        function nChildNodes() {
            return sizeof($this->childNodes);
        }

        function getChildNode( $i ) {
            return $this->childNodes[$i];
        }

        function setChildNode( XMLNode $node ) {
            $this->childNodes[] = $node;
        }

        function getName() {
            return $this->name;
        }

        function getAttribute( $name ) {
            $name = strtoupper($name);
            return isset($this->attributes[$name]) ? $this->attributes[$name] :
                   "";
        }

        function setText( $text ) {
            $this->attributes['TEXT'] = $text;
        }

        function getText() {
            return $this->attributes['TEXT'];
        }
    }
    
    class xmlParser {
        private $_parser;
        private $_root_node = null;
        private $_curr_node = null;

        public function xmlParser() {
            $this->_parser = xml_parser_create();

            xml_set_object($this->_parser, $this);
            xml_set_default_handler( $this->_parser, 'text_handler' );
            xml_set_element_handler( $this->_parser,
                                     'start_element_handler',
                                     'end_element_handler' );
        }

        public function destroy() {
            xml_parser_free($this->_parser);
        }

        public function lastError() {
            return $this->_last_error;
        }
        
        public function parse( $data ) {
            if ( !xml_parse( $this->_parser, $data ) ) {
                $this->_last_error = xml_get_current_line_number($this->_parser) . ": ". xml_error_string($this->_parser);
                return false;
            }
            return $this->_root_node;
        }
        
        private function start_element_handler( $parser, $name, $attribs ) {
            if ( !$this->_root_node ) {
                $new_node = new XMLNode( $name, $attribs );
                $this->_root_node = $new_node;
                $this->_curr_node = $new_node;
            }
            else {
                $old_node = $this->_curr_node;
                $new_node = new XMLNode( $name, $attribs, $old_node );
                $old_node->setChildNode( $new_node );
                $this->_curr_node = $new_node;
            }
            
        }

        private function text_handler( $parser, $text ) {
            if ( $this->_curr_node )
                $this->_curr_node->setText( $text );
        }
        
        private function end_element_handler( $parser, $name ) {
            if ( $this->_root_node ) {
                $this->_curr_node = $this->_curr_node->getParentNode();
            }
        }
    }
?>