XHTMLCompiler/DOMFilter/Metadata.php

   1 <?php
   2
   3 /**
   4  * Extracts metadata from XHTMLCompiler_Page (which comes the version
   5  * control system) and inserts it in the HTML page.
   6  */
   7 class XHTMLCompiler_DOMFilter_Metadata extends XHTMLCompiler_DOMFilter {
   8
   9     protected $name = 'Metadata';
  10
  11     public function process(DOMDocument $dom, $page, $manager) {
  12
  13         $head = $dom->getElementsByTagName('head')->item(0);
  14         if (!$head) return;
  15         $manager->addDependency(__FILE__);
  16
  17         $date = $page->getCreatedTime();
  18         // check if the meta element already exists
  19         $meta = $dom->createElement('meta');
  20         $append = true;
  21         foreach ($head->getElementsByTagName('meta') as $node) {
  22             if ($node->getAttribute('name') == 'Date') {
  23                 // it exists: use this date as the "real" date.
  24                 $meta = $node;
  25                 if ($t = $meta->getAttribute('content')) {
  26                     // this code is slightly redundant since getCreatedTime()
  27                     // will have already accounted for this. Still, can't hurt.
  28                     $date = new DateTime($t);
  29                 }
  30                 $append = false;
  31                 break;
  32             }
  33         }
  34         // only write if we have a valid date
  35         if ($date) {
  36             $meta->setAttribute('name', 'Date');
  37             $meta->setAttribute('content', $date->format('c'));
  38             if ($append) $head->appendChild($meta);
  39         }
  40
  41     }
  42
  43 }