classes/feeditem/common.php

   1 <?php
   2 abstract class FeedItem_Common extends FeedItem {
   3         protected $elem;
   4         protected $xpath;
   5         protected $doc;
   6
   7         function __construct($elem, $doc, $xpath) {
   8                 $this->elem = $elem;
   9                 $this->xpath = $xpath;
  10                 $this->doc = $doc;
  11
  12                 try {
  13
  14                         $source = $elem->getElementsByTagName("source")->item(0);
  15
  16                         // we don't need <source> element
  17                         if ($source)
  18                                 $elem->removeChild($source);
  19                 } catch (DOMException $e) {
  20                         //
  21                 }
  22         }
  23
  24         function get_element() {
  25                 return $this->elem;
  26         }
  27
  28         function get_author() {
  29                 $author = $this->elem->getElementsByTagName("author")->item(0);
  30
  31                 if ($author) {
  32                         $name = $author->getElementsByTagName("name")->item(0);
  33
  34                         if ($name) return $name->nodeValue;
  35
  36                         $email = $author->getElementsByTagName("email")->item(0);
  37
  38                         if ($email) return $email->nodeValue;
  39
  40                         if ($author->nodeValue)
  41                                 return $author->nodeValue;
  42                 }
  43
  44                 $author = $this->xpath->query("dc:creator", $this->elem)->item(0);
  45
  46                 if ($author) {
  47                         return $author->nodeValue;
  48                 }
  49         }
  50
  51         function get_comments_url() {
  52                 //RSS only. Use a query here to avoid namespace clashes (e.g. with slash).
  53                 //might give a wrong result if a default namespace was declared (possible with XPath 2.0)
  54                 $com_url = $this->xpath->query("comments", $this->elem)->item(0);
  55
  56                 if($com_url)
  57                         return $com_url->nodeValue;
  58
  59                 //Atom Threading Extension (RFC 4685) stuff. Could be used in RSS feeds, so it's in common.
  60                 //'text/html' for type is too restrictive?
  61                 $com_url = $this->xpath->query("atom:link[@rel='replies' and contains(@type,'text/html')]/@href", $this->elem)->item(0);
  62
  63                 if($com_url)
  64                         return $com_url->nodeValue;
  65         }
  66
  67         function get_comments_count() {
  68                 //also query for ATE stuff here
  69                 $query = "slash:comments|thread:total|atom:link[@rel='replies']/@thread:count";
  70                 $comments = $this->xpath->query($query, $this->elem)->item(0);
  71
  72                 if ($comments) {
  73                         return $comments->nodeValue;
  74                 }
  75         }
  76
  77         function count_children($node) {
  78                 return $node->getElementsByTagName("*")->length;
  79         }
  80
  81         function subtree_or_text($node) {
  82                 if ($this->count_children($node) == 0) {
  83                         return $node->nodeValue;
  84                 } else {
  85                         return $node->c14n();
  86                 }
  87         }
  88
  89 }