_parse_lockinfo.php

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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Hartmut Holzgraefe <hholzgra@php.net>                       |
// |          Christian Stocker <chregu@bitflux.ch>                       |
// +----------------------------------------------------------------------+
//
// $Id: _parse_lockinfo.php,v 1.2 2004/01/05 12:32:40 hholzgra Exp $
//

class _parse_lockinfo 
{
        var $success = false;

        var $locktype = "";

        var $lockscope = "";

        var $owner = "";

        var $collect_owner = false;
        
    function _parse_lockinfo($path) 
        {
                // we assume success unless problems occur
                $this->success = true;

                // remember if any input was parsed
                $had_input = false;
                
                // open stream
                $f_in = fopen($path, "r");
                if (!$f_in) {
                        $this->success = false;
                        return;
                }

                // create namespace aware parser
                $xml_parser = xml_parser_create_ns("UTF-8", " ");

                // set tag and data handlers
                xml_set_element_handler($xml_parser,
                                                                array(&$this, "_startElement"),
                                                                array(&$this, "_endElement"));
                xml_set_character_data_handler($xml_parser,
                                                                           array(&$this, "_data"));

                // we want a case sensitive parser
                xml_parser_set_option($xml_parser,
                                                          XML_OPTION_CASE_FOLDING, false);

                // parse input
                while($this->success && !feof($f_in)) {
                        $line = fgets($f_in);
                        if (is_string($line)) {
                                $had_input = true;
                                $this->success &= xml_parse($xml_parser, $line, false);
                        }
                } 

                // finish parsing
                if($had_input) {
                        $this->success &= xml_parse($xml_parser, "", true);
                }

                // check if required tags where found
                $this->success &= !empty($this->locktype);
                $this->success &= !empty($this->lockscope);

                // free parser resource
                xml_parser_free($xml_parser);

                // close input stream
                fclose($f_in);          
        }
    

    function _startElement($parser, $name, $attrs) 
    {
                // namespace handling
        if (strstr($name, " ")) {
            list($ns, $tag) = explode(" ", $name);
        } else {
            $ns = "";
            $tag = $name;
        }
                
  
        if ($this->collect_owner) {
                        // everything within the <owner> tag needs to be collected
            $ns_short = "";
            $ns_attr = "";
            if ($ns) {
                if ($ns == "DAV:") {
                    $ns_short = "D:";
                } else {
                    $ns_attr = " xmlns='$ns'";
                }
            }
            $this->owner .= "<$ns_short$tag$ns_attr>";
        } else if ($ns == "DAV:") {
                        // parse only the essential tags
            switch ($tag) {
                        case "write":
                                $this->locktype = $tag;
                                break;
                        case "exclusive":
                        case "shared":
                                $this->lockscope = $tag;
                                break;
                        case "owner":
                                $this->collect_owner = true;
                                break;
            }
        }
    }
        
    function _data($parser, $data) 
    {
                // only the <owner> tag has data content
        if ($this->collect_owner) {
            $this->owner .= $data;
        }
    }

    function _endElement($parser, $name) 
    {
                // namespace handling
                if (strstr($name, " ")) {
                        list($ns, $tag) = explode(" ", $name);
                } else {
                        $ns = "";
                        $tag = $name;
                }

                // <owner> finished?
                if (($ns == "DAV:") && ($tag == "owner")) {
                        $this->collect_owner = false;
                }

                // within <owner> we have to collect everything
                if ($this->collect_owner) {
                        $ns_short = "";
                        $ns_attr = "";
                        if ($ns) {
                                if ($ns == "DAV:") {
                    $ns_short = "D:";
                                } else {
                                        $ns_attr = " xmlns='$ns'";
                                }
                        }
                        $this->owner .= "</$ns_short$tag$ns_attr>";
                }
    }
}

?>