<?php
/*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

/*
*  Written by Reverend Jim (jim@revjim.net)
*
*  http://revjim.net/code/xmlParser/
*/

class XMLParser {
    var $ns2uri = array();
    var $uri2ns = array();
    var $unkcnt = 0;
    var $data; // Holds the XML structure
    var $xmldata; // Holds XML data
    var $version = "0.3";


    function defineNs($ident, $uri = "") {
        if ($uri == "") {
            $uri = "::UNDEFINED::";
        }
        $this->ns2uri[strtoupper($ident)] = $uri;
        $this->uri2ns[$uri] = strtoupper($ident);
    }

    function _getXmlChildren(&$vals, $ns, &$i) {
        $children = array();

        if ($vals[$i]['value']) {
            array_push($children, $vals[$i]['value']);
        }
    
        while (++$i < count($vals)) {
            switch ($vals[$i]['type']) {
                case 'cdata':
                    array_push($children, $vals[$i]['value']);
                    break;
    
                case 'complete':
                    $tmpns = $this->getnamespaces($vals[$i]['attributes'],$ns);
                    $tag = $this->_convertTagNs($vals[$i]['tag'],$tmpns);
                    if($vals[$i]['value']) {
                        array_push($children, array(
                            'tag' => $tag,
                            'attributes' => $vals[$i]['attributes'],
                            'children' => array($vals[$i]['value'])
                        ));
                    } else {
                        array_push($children, array(
                            'tag' => $tag,
                            'attributes' => $vals[$i]['attributes']
                        ));
                    }

                    break;
    
                case 'open':
                    $tmpns = $this->getnamespaces($vals[$i]['attributes'],$ns);
                    $tag = $this->_convertTagNs($vals[$i]['tag'],$tmpns);
                    array_push($children, array(
                        'tag' => $tag,
                        'attributes' => $vals[$i]['attributes'],
                        'children' => $this->_getXmlChildren($vals,$tmpns,$i)
                    ));
                    break;
    
                case 'close':
                    if ($vals[$i]['value']) {
                        array_push($children, $vals[$i]['value']);
                    }
                    return $children;
            }
        }
    }

    function _convertTagNs($tag,$ns) {
        if($pos = strpos($tag,':')) {
            $docns = substr($tag,0,$pos);
            $doctag = substr($tag,$pos+1);
        } else {
            $docns = "::ROOT";
            $doctag = "$tag";
        }

        if ($ns[$docns]) {
            $uri = $ns[$docns];
        } else {
            $uri = "::UNDEFINED::";
        }

        if($this->uri2ns[$uri]) {
            $parns = $this->uri2ns[$uri];
        } else {
            $this->definens("::UNK" . $this->unkcnt, $uri);
            $parns = "::UNK" . $this->unkcnt;
            $this->unkcnt++;
        }

        return $parns . ":" . $doctag;
        
    }

    function getXmlTree() {
        return $this->data;
    }

    function setXmlData($data) {
        $this->xmldata = $data;
    }

    function buildXmlTree() {
        $p = xml_parser_create();
        xml_parser_set_option($p, XML_OPTION_SKIP_WHITE, 1);
        xml_parse_into_struct($p, $this->xmldata, &$vals, &$index);
        xml_parser_free($p);
    
        $this->data = array();
        $i = 0;
        $ns = $this->getnamespaces($vals[$i]['attributes']);
        array_push($this->data, array(
            'tag' => $this->_convertTagNs($vals[$i]['tag'],$ns),
            'attributes' => $vals[$i]['attributes'],
            'children' => $this->_getXmlChildren($vals, $ns, $i)
        ));
    }    

    function getnamespaces($attribs,$ns = array()) {
        if (is_array($attribs)) {
            foreach($attribs as $key => $value) {
                $key = strtoupper($key);
                if (substr($key,0,5) == 'XMLNS') {
                    if($pos = strpos($key,':')) {
                        $ns[substr($key,$pos+1)] = $value;
                    } else {
                        $ns['::ROOT']= $value;
                    }
                }
            }
        }


        return $ns;
    }
                    

}
    
?>
