classes/feedparser.php

   1 <?php
   2 class FeedParser {
   3         private $doc;
   4         private $error;
   5         private $items;
   6         private $link;
   7         private $title;
   8         private $type;
   9
  10         const FEED_RDF = 0;
  11         const FEED_RSS = 1;
  12         const FEED_ATOM = 2;
  13
  14         function __construct($data) {
  15                 libxml_use_internal_errors(true);
  16                 libxml_clear_errors();
  17                 $this->doc = new DOMDocument();
  18                 $this->doc->loadXML($data);
  19                 $this->error = $this->format_error(libxml_get_last_error());
  20                 libxml_clear_errors();
  21
  22                 $this->items = array();
  23         }
  24
  25         function init() {
  26                 $root = $this->doc->firstChild;
  27
  28                 if ($root) {
  29                         switch ($root->tagName) {
  30                         case "rss":
  31                                 $this->type = $this::FEED_RSS;
  32                                 break;
  33                         case "feed":
  34                                 $this->type = $this::FEED_ATOM;
  35                                 break;
  36                         default:
  37                                 $this->error = "Unknown/unsupported feed type";
  38                                 return;
  39                         }
  40
  41                         $xpath = new DOMXPath($this->doc);
  42
  43                         switch ($this->type) {
  44                         case $this::FEED_ATOM:
  45                                 $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
  46
  47                                 $title = $xpath->query("//atom:feed/atom:title")->item(0);
  48
  49                                 if ($title) {
  50                                         $this->title = $title->nodeValue;
  51                                 }
  52
  53                                 $link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0);
  54
  55                                 if ($link && $link->hasAttributes()) {
  56                                         $this->link = $link->getAttribute("href");
  57                                 }
  58
  59                                 $articles = $xpath->query("//atom:entry");
  60
  61                                 foreach ($articles as $article) {
  62                                         array_push($this->items, new FeedItem_Atom($article));
  63                                 }
  64
  65                                 break;
  66                         case $this::FEED_RDF:
  67
  68                                 break;
  69                         case $this::FEED_RSS:
  70                                 break;
  71                         }
  72                 }
  73         }
  74
  75         function format_error($error) {
  76                 if ($error) {
  77                         return sprintf("LibXML error %s at line %d (column %d): %s",
  78                                 $error->code, $error->line, $error->column,
  79                                 $error->message);
  80                 } else {
  81                         return "";
  82                 }
  83         }
  84
  85         function error() {
  86                 return $this->error;
  87         }
  88
  89         function get_link() {
  90                 return $this->link;
  91         }
  92
  93         function get_title() {
  94                 return $this->title;
  95         }
  96
  97         function get_items() {
  98                 return $this->items;
  99         }
 100
 101 } ?>