include/classes/UrlRewrite/GlossaryUrl.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2010                                              */
   6 /* Inclusive Design Institute                                           */
   7 /* http://atutor.ca                                                     */
   8 /* This program is free software. You can redistribute it and/or        */
   9 /* modify it under the terms of the GNU General Public License          */
  10 /* as published by the Free Software Foundation.                        */
  11 /************************************************************************/
  12 // $Id$
  13 /**
  14 * UrlParser
  15 * Class for rewriting pretty urls on forums.
  16 * @access       public
  17 * @author       Harris Wong
  18 * @package      UrlParser
  19 */
  20 class GlossaryUrl {
  21         // constructor
  22         function GlossaryUrl() {
  23                 $this->rule = array(0=>'p');
  24         }
  25
  26         /**
  27          * Construct pretty url by the given query string.
  28          */
  29         function constructPrettyUrl($query){
  30                 if (empty($query)){
  31                         return '';
  32                 }
  33
  34                 //Take out bookmark
  35                 if (($pos = strpos($query, '#'))!==FALSE){
  36                         $bookmark = substr($query, $pos);
  37                         $query = substr($query, 0, $pos);
  38                 }
  39
  40                 //If this is already a pretty url,but without mod_apache rule
  41                 //unwrap it and reconstruct
  42                 if (is_array($query)){
  43                         $new_query = '';
  44                         foreach($query as $fk=>$fv){
  45                                 if      (preg_match('/\.php/', $fv)==1){
  46                                         continue;       //skip the php file
  47                                 }
  48
  49                                 //check if this is part of the rule, if so,add it, o/w ignore
  50                                 if (array_search($fv, $this->rule)!==FALSE){
  51                                         $new_query .= $fv . '=' . $query[$fk+1] . SEP;
  52                                 } elseif (preg_match('/([0-9]+)\.html/', $fv, $matches)==1){
  53                                         $new_query .= 'page=' . $matches[1] . SEP;
  54                                 }
  55                         }
  56                         $query = $new_query;    //done
  57                 }
  58
  59                 $temp = explode(SEP, $query);
  60                 foreach ($temp as $index=>$attributes){
  61                         if(empty($attributes)){
  62                                 //skip the ones that are empty.
  63                                 continue;
  64                         }
  65                         list($key, $value) = preg_split('/\=/', $attributes, 2);
  66                         $query_parts[$key] = $value;
  67                 }
  68
  69                 $query_string = '';
  70
  71                 //construct pretty url on mapping
  72                 foreach ($this->rule as $key=>$value){
  73
  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 ?>