include/classes/UrlRewrite/ContentUrl.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2008 by Greg Gay, Joel Kronenberg & Heidi Hazelton*/
   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 // $Id$
  14 /**
  15 * ContentUrl
  16 * Class for rewriting pretty urls.
  17 * @access       public
  18 * @author       Harris Wong
  19 * @package      UrlParser
  20 */
  21 class ContentUrl {
  22         // constructor
  23         function ContentUrl() {
  24                 $this->rule = array(0=>'cid');
  25         }
  26
  27         /**
  28          * Construct pretty url by the given query string.
  29          */
  30         function constructPrettyUrl($query){
  31                 $url = '';  //url to be returned
  32                 $bookmark = '';         //html bookmark
  33
  34                 if (empty($query)){
  35                         return '';
  36                 }
  37
  38                 //Take out bookmark
  39                 if (($pos = strpos($query, '#'))!==FALSE){
  40                         $bookmark = substr($query, $pos);
  41                         $query = substr($query, 0, $pos);
  42                 }
  43
  44                 //If this is already a pretty url,but without mod_apache rule
  45                 //unwrap it and reconstruct
  46                 if (is_array($query)){
  47                         $new_query = '';
  48                         foreach($query as $fk=>$fv){
  49                                 if      (preg_match('/\.php/', $fv)==1){
  50                                         continue;       //skip the php file
  51                                 }
  52
  53                                 //check if this is part of the rule, if so,add it, o/w ignore
  54                                 if (array_search($fv, $this->rule)!==FALSE){
  55                                         $new_query .= $fv . '=' . $query[$fk+1] . SEP;
  56                                 }
  57                         }
  58                         $query = $new_query;    //done
  59                 }
  60
  61                 $temp = explode(SEP, $query);
  62                 foreach ($temp as $index=>$attributes){
  63                         if(empty($attributes)){
  64                                 //skip the ones that are empty.
  65                                 continue;
  66                         }
  67                         list($key, $value) = preg_split('/\=/', $attributes, 2);
  68                         $query_parts[$key] = $value;
  69                 }
  70
  71                 $query_string = '';
  72                 //construct pretty url on mapping
  73                 foreach ($this->rule as $key=>$value){
  74                         //if this value is empty, the url construction should quit.
  75                         if ($query_parts[$value] ==''){
  76                                 break;
  77                         }
  78                         $url .= $query_parts[$value].'/';
  79
  80                         //if the query parts are not in the defined rules, set it back to query string again
  81                         if ($query_parts[$this->rule[$key]]!=''){
  82                                 $query_parts[$this->rule[$key]] = '';
  83                         }
  84                 }
  85
  86                 //Go through the query_parts again, and for those values that are not empty
  87                 // add it to the querystring
  88                 foreach($query_parts as $key=>$value){
  89                         //paginator are handle differently
  90                         if ($value!='' && $key!='page'){
  91                                 $query_string .= $key.'='.$value.SEP;
  92                         }
  93                 }
  94                 //take out the last sep.
  95                 $query_string = substr($query_string, 0, -1);
  96
  97                 //handle paginators
  98 //              if ($query_parts['page']!=''){
  99 //                      $url .= '/'.$query_parts['page'].'.html';
 100 //              }
 101
 102                 //append query string at the back
 103                 if ($query_string!=''){
 104                         $url .= '?'.$query_string;
 105                 }
 106
 107                 //finally, append bookmark if not emptied
 108                 if ($bookmark!=''){
 109                         $url .= $bookmark;
 110                 }
 111
 112                 return $url;
 113         }
 114 }
 115 ?>