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                 $xpath = new DOMXPath($this->doc);
  28                 $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom');
  29
  30                 $root = $xpath->query("(//atom:feed|//channel)")->item(0);
  31
  32                 if ($root) {
  33                         switch ($root->tagName) {
  34                         case "channel":
  35                                 $this->type = $this::FEED_RSS;
  36                                 break;
  37                         case "feed":
  38                                 $this->type = $this::FEED_ATOM;
  39                                 break;
  40                         default:
  41                                 $this->error = "Unknown/unsupported feed type";
  42                                 return;
  43                         }
  44
  45                         switch ($this->type) {
  46                         case $this::FEED_ATOM:
  47
  48                                 $title = $xpath->query("//atom:feed/atom:title")->item(0);
  49
  50                                 if ($title) {
  51                                         $this->title = $title->nodeValue;
  52                                 }
  53
  54                                 $link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0);
  55
  56                                 if ($link && $link->hasAttributes()) {
  57                                         $this->link = $link->getAttribute("href");
  58                                 }
  59
  60                                 $articles = $xpath->query("//atom:entry");
  61
  62                                 foreach ($articles as $article) {
  63                                         array_push($this->items, new FeedItem_Atom($article));
  64                                 }
  65
  66                                 break;
  67                         case $this::FEED_RDF:
  68
  69                                 break;
  70                         case $this::FEED_RSS:
  71
  72                                 $title = $xpath->query("//channel/title")->item(0);
  73
  74                                 if ($title) {
  75                                         $this->title = $title->nodeValue;
  76                                 }
  77
  78                                 $link = $xpath->query("//channel/link")->item(0);
  79
  80                                 if ($link && $link->hasAttributes()) {
  81                                         $this->link = $link->getAttribute("href");
  82                                 }
  83
  84                                 $articles = $xpath->query("//channel/item");
  85
  86                                 foreach ($articles as $article) {
  87                                         array_push($this->items, new FeedItem_RSS($article));
  88                                 }
  89
  90                                 break;
  91                         }
  92                 }
  93         }
  94
  95         function format_error($error) {
  96                 if ($error) {
  97                         return sprintf("LibXML error %s at line %d (column %d): %s",
  98                                 $error->code, $error->line, $error->column,
  99                                 $error->message);
 100                 } else {
 101                         return "";
 102                 }
 103         }
 104
 105         function error() {
 106                 return $this->error;
 107         }
 108
 109         function get_link() {
 110                 return $this->link;
 111         }
 112
 113         function get_title() {
 114                 return $this->title;
 115         }
 116
 117         function get_items() {
 118                 return $this->items;
 119         }
 120
 121 } ?>