XHTMLCompiler/DOMFilter/NewsLinker.php

   1 <?php
   2
   3 /**
   4  * This filter, closely related with the News filter, generates links
   5  * between news entries.
   6  */
   7 class XHTMLCompiler_DOMFilter_NewsLinker extends XHTMLCompiler_DOMFilter
   8 {
   9     protected $name = 'NewsLinker';
  10     public function process(DOMDocument $dom, $page, $manager) {
  11         if (!isset($page->attr['news'])) return;
  12         $manager->addDependency(__FILE__);
  13
  14         // calculate forward and backward links
  15         $fs = new FSTools();
  16         // we assume that one directory up is the years directory. An alternate
  17         // algorithm may be needed if we decide to allow further nesting.
  18         // This code needs to be factored out
  19         $result = $fs->globr(dirname($page->getDirname()), '*.xhtml');
  20         // This doesn't work if there is more than one entry in a day
  21         sort($result);
  22         $prev = $next = null;
  23         $found = false;
  24         foreach ($result as $i => $entry) {
  25             $base = basename($entry);
  26             if (strlen($base) < 4 || !ctype_digit(substr($base, 0, 4))) {
  27                 continue;
  28             }
  29             if ($page->getSourcePath() == $entry) {
  30                 $found = true;
  31             } elseif (!$found) {
  32                 $prev = $entry;
  33             } else {
  34                 $next = $entry;
  35                 break;
  36             }
  37         }
  38
  39         $content = $dom->getElementById('content');
  40         $body = $content->parentNode;
  41         $nav = $dom->createElement('div');
  42         $nav->setAttribute('id', 'news-navigation');
  43
  44         if ($prev) {
  45             $prevPage = new XHTMLCompiler_Page($prev);
  46             if (!$page->isCacheExistent()) {
  47                 // Force a new cache run
  48                 $prevPage->touch();
  49             }
  50             $prevDiv = $dom->createElement('div');
  51             $prevDiv->setAttribute('class', 'prev');
  52             $a = $dom->createElement('a', 'Previous');
  53             $a->setAttribute('href', $prevPage->getAbsolutePath());
  54             $prevDiv->appendChild($a);
  55             $nav->appendchild($prevDiv);
  56         }
  57
  58         $indexDiv = $dom->createElement('div');
  59         $indexDiv->setAttribute('class', 'index');
  60         $a = $dom->createElement('a', 'Index');
  61         $indexDiv->appendChild($a);
  62         //$nav->appendChild($indexDiv);
  63
  64         if ($next) {
  65             $nextPage = new XHTMLCompiler_Page($next);
  66             $nextDiv = $dom->createElement('div');
  67             $nextDiv->setAttribute('class', 'next');
  68             $a = $dom->createElement('a', 'Next');
  69             $a->setAttribute('href', $nextPage->getAbsolutePath());
  70             $nextDiv->appendChild($a);
  71             $nav->appendChild($nextDiv);
  72         }
  73
  74         $body->appendChild($nav);
  75     }
  76 }