XmlParser.class.php

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<?
/* XmlParser.class.php

   Class to manage XML files. Its main aim is to encapsulate all the 
   stuff related to XML management and to provide a wrapper to the
   XML functions in PHP to make them OO and to allow an easy
   transition to PHP 5.
   
   Its main functions are:
        - (TODO) Given an XSchema, Check if an XML file is valid.
        - Parse the XML file into a struct via xml_parse_into_struct.
        - Parse the XML file into a tree (it allows an easier processing
          than working with the struct).
        - (TODO) Apply an XSLT to a given XML file.
        
   Note: The parse XML into a tree code is taken from the one by 
   [dave at ovumdesign dot com] in the PHP manual.
*/

class XmlParser
{
        var $filename;
        
        var $content;
        
        function XmlParser($filename)
        {
                /* If it is the name of a file, we will suppose we want to
                parse it, else, it will be the Xml data */
                if (file_exists($filename))
                        $this->setFilename($filename);
                else
                        $this->setData($filename);
        }
        
        function setFilename($string)
        {
                $this->filename = $string;
                
                $this->content = join('', file($this->filename));
        }
        
        function setData($data)
        {
                $this->content = $data;
        }
        
        function &getStruct()
        {
                $parser = xml_parser_create();
                xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
                xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE,   1);
                xml_parse_into_struct($parser, $this->content, $vals, $index);
                xml_parser_free($parser);
                
                $struct["vals"] =& $vals;
                $struct["index"] =& $index;
                
                return $struct;
        }
        
        function &getTree()
        {
                $struct =& $this->getStruct();
                
                
                return array(
                        'tag'       => $struct["vals"][0]['tag'],
                        'attributes' => isset($struct["vals"][0]['attributes'])?
                                                $struct["vals"][0]['attributes'] : null,
                        'children'   => $this->_getChildren($struct["vals"], $i = 0),
                );              
        }
        
        function _getChildren($vals, &$i) 
        {
                $children = array();
                if (isset($vals[$i]['value'])) $children[] = $vals[$i]['value'];

                while (++$i < count($vals)) 
                {
                        switch ($vals[$i]['type']) 
                        {
                                case 'cdata':
                                        $children[] = $vals[$i]['value'];
                                        break;

                                case 'complete':
                                        $children[] = array(
                                                'tag'       => $vals[$i]['tag'],
                                                'attributes' => isset($vals[$i]['attributes'])?
                                                                $vals[$i]['attributes'] : null,
                                                'value'      => $vals[$i]['value'],
                                        );
                                        break;

                                case 'open':
                                        $children[] = array(
                                                'tag'      => $vals[$i]['tag'],
                                                'attributes' => isset($vals[$i]['attributes'])?
                                                                $vals[$i]['attributes'] : null,
                                                'children'   => $this->_getchildren($vals, $i),
                                        );
                                        break;

                                case 'close':
                                        return $children;
                        }
                }
        }               
}
?>

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