include/classes/Weblinks/WeblinksParser.class.php

   1 <?php
   2 /****************************************************************/
   3 /* ATutor                                                                                                               */
   4 /****************************************************************/
   5 /* Copyright (c) 2002-2009                                                                              */
   6 /* Adaptive Technology Resource Centre / University of Toronto  */
   7 /* http://atutor.ca                                                                                             */
   8 /*                                                              */
   9 /* This program is free software. You can redistribute it and/or*/
  10 /* modify it under the terms of the GNU General Public License  */
  11 /* as published by the Free Software Foundation.                                */
  12 /****************************************************************/
  13 // $Id: WeblinksParser.class.php 8782 2009-09-04 17:33:07Z hwong $
  14
  15 /**
  16 * WeblinksParser
  17 * Class for parsing XML language info and returning a Weblink Object
  18 * @access       public
  19 * @author       Harris Wong
  20 */
  21 class WeblinksParser {
  22         //private
  23         var $parser; // the XML handler
  24         var $character_data; // tmp variable for storing the data
  25         var $element_path; // array of element paths (basically a stack)
  26         var $title;     //link's title
  27         var $url; //url
  28
  29         //constructor
  30         function WeblinksParser() {
  31                 $this->parser = xml_parser_create();
  32
  33                 xml_set_object($this->parser, $this);
  34                 xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false); /* conform to W3C specs */
  35                 xml_set_element_handler($this->parser, 'startElement', 'endElement');
  36                 xml_set_character_data_handler($this->parser, 'characterData');
  37         }
  38
  39
  40         // public
  41         // @return      true if parsed successfully, false otherwise
  42         function parse($xml_data) {
  43                 $this->element_path   = array();
  44                 $this->character_data = '';
  45                 xml_parse($this->parser, $xml_data, TRUE);
  46         }
  47
  48         // private
  49         function startElement($parser, $name, $attributes) {
  50                 //save attributes.
  51                 switch($name) {
  52                         case 'url':
  53                                 $this->url = $attributes['href'];
  54                                 break;
  55                 }
  56                 array_push($this->element_path, $name);
  57    }
  58
  59         // private
  60         /* called when an element ends */
  61         /* removed the current element from the $path */
  62         function endElement($parser, $name) {
  63                 //check element path
  64                 $current_pos = count($this->element_path) - 1;
  65                 $last_element = $this->element_path[$current_pos - 1];
  66
  67                 switch($name) {
  68                         case 'title':
  69                                 $this->title = $this->character_data;
  70                                 break;
  71                 }
  72
  73                 //pop stack and reset character data, o/w it will stack up
  74                 array_pop($this->element_path);
  75                 $this->character_data = '';
  76         }
  77
  78         // private
  79         function characterData($parser, $data){
  80                 global $addslashes;
  81                 if (trim($data)!=''){
  82                         $this->character_data .= preg_replace('/[\t\0\x0B(\r\n)]*/', '', $data);
  83 //                      $this->character_data .= trim($data);
  84                 }
  85         }
  86
  87         //public
  88         function close(){
  89                 //Free the XML parser
  90                 xml_parser_free($this->parser);
  91         }
  92
  93         //gets
  94         function getTitle(){
  95                 return $this->title;
  96         }
  97         function getUrl(){
  98                 return urldecode($this->url);
  99         }
 100 }
 101
 102 ?>