include/classes/UrlRewrite/GlossaryUrl.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 * UrlParser
  16 * Class for rewriting pretty urls on forums.
  17 * @access       public
  18 * @author       Harris Wong
  19 * @package      UrlParser
  20 */
  21 class GlossaryUrl {
  22         // constructor
  23         function GlossaryUrl() {
  24                 $this->rule = array(0=>'p');
  25         }
  26
  27         /**
  28          * Construct pretty url by the given query string.
  29          */
  30         function constructPrettyUrl($query){
  31                 if (empty($query)){
  32                         return '';
  33                 }
  34
  35                 //Take out bookmark
  36                 if (($pos = strpos($query, '#'))!==FALSE){
  37                         $bookmark = substr($query, $pos);
  38                         $query = substr($query, 0, $pos);
  39                 }
  40
  41                 //If this is already a pretty url,but without mod_apache rule
  42                 //unwrap it and reconstruct
  43                 if (is_array($query)){
  44                         $new_query = '';
  45                         foreach($query as $fk=>$fv){
  46                                 if      (preg_match('/\.php/', $fv)==1){
  47                                         continue;       //skip the php file
  48                                 }
  49
  50                                 //check if this is part of the rule, if so,add it, o/w ignore
  51                                 if (array_search($fv, $this->rule)!==FALSE){
  52                                         $new_query .= $fv . '=' . $query[$fk+1] . SEP;
  53                                 } elseif (preg_match('/([0-9]+)\.html/', $fv, $matches)==1){
  54                                         $new_query .= 'page=' . $matches[1] . SEP;
  55                                 }
  56                         }
  57                         $query = $new_query;    //done
  58                 }
  59
  60                 $temp = explode(SEP, $query);
  61                 foreach ($temp as $index=>$attributes){
  62                         if(empty($attributes)){
  63                                 //skip the ones that are empty.
  64                                 continue;
  65                         }
  66                         list($key, $value) = preg_split('/\=/', $attributes, 2);
  67                         $query_parts[$key] = $value;
  68                 }
  69
  70                 $query_string = '';
  71
  72                 //construct pretty url on mapping
  73                 foreach ($this->rule as $key=>$value){
  74
  75                         //if this value is empty, the url construction should quit.
  76                         if ($query_parts[$value] ==''){
  77                                 break;
  78                         }
  79                         $url .= $query_parts[$value].'/';
  80
  81                         //if the query parts are not in the defined rules, set it back to query string again
  82                         if ($query_parts[$this->rule[$key]]!=''){
  83                                 $query_parts[$this->rule[$key]] = '';
  84                         }
  85                 }
  86
  87                 //Go through the query_parts again, and for those values that are not empty
  88                 // add it to the querystring
  89                 foreach($query_parts as $key=>$value){
  90                         //paginator are handle differently
  91                         if ($value!='' && $key!='page'){
  92                                 $query_string .= $key.'='.$value.SEP;
  93                         }
  94                 }
  95                 //take out the last sep.
  96                 $query_string = substr($query_string, 0, -1);
  97
  98                 //handle paginators
  99                 if ($query_parts['page']!=''){
 100                         $url .= $query_parts['page'].'.html';
 101                 }
 102
 103                 //append query string at the back
 104                 if ($query_string!=''){
 105                         $url .= '?'.$query_string;
 106                 }
 107
 108                 //finally, append bookmark if not emptied
 109                 if ($bookmark!=''){
 110                         $url .= $bookmark;
 111                 }
 112
 113                 return $url;
 114         }
 115 }
 116 ?>