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
  13         // calculate forward and backward links
  14         $fs = new FSTools();
  15         // we assume that one directory up is the years directory. An alternate
  16         // algorithm may be needed if we decide to allow further nesting.
  17         // This code needs to be factored out
  18         $result = $fs->globr(dirname($page->getDirname()), '*.xhtml');
  19         // This doesn't work if there is more than one entry in a day
  20         sort($result);
  21         $prev = $next = null;
  22         $found = false;
  23         foreach ($result as $i => $entry) {
  24             $base = basename($entry);
  25             if (strlen($base) < 4 || !ctype_digit(substr($base, 0, 4))) {
  26                 continue;
  27             }
  28             if ($page->getSourcePath() == $entry) {
  29                 $found = true;
  30             } elseif (!$found) {
  31                 $prev = $entry;
  32             } else {
  33                 $next = $entry;
  34                 break;
  35             }
  36         }
  37
  38         $body = $dom->getElementsByTagName('body')->item(0);
  39         $nav = $dom->createElement('div');
  40         $nav->setAttribute('id', 'news-navigation');
  41
  42         if ($prev) {
  43             $prevPage = new XHTMLCompiler_Page($prev);
  44             if (!$page->isCacheExistent()) {
  45                 // Force a new cache run
  46                 $prevPage->touch();
  47             }
  48             $prevDiv = $dom->createElement('div');
  49             $prevDiv->setAttribute('class', 'prev');
  50             $a = $dom->createElement('a', 'Previous');
  51             $a->setAttribute('href', $prevPage->getAbsolutePath());
  52             $prevDiv->appendChild($a);
  53             $nav->appendchild($prevDiv);
  54         }
  55
  56         $indexDiv = $dom->createElement('div');
  57         $indexDiv->setAttribute('class', 'index');
  58         $a = $dom->createElement('a', 'Index');
  59         $indexDiv->appendChild($a);
  60         //$nav->appendChild($indexDiv);
  61
  62         if ($next) {
  63             $nextPage = new XHTMLCompiler_Page($next);
  64             $nextDiv = $dom->createElement('div');
  65             $nextDiv->setAttribute('class', 'next');
  66             $a = $dom->createElement('a', 'Next');
  67             $a->setAttribute('href', $nextPage->getAbsolutePath());
  68             $nextDiv->appendChild($a);
  69             $nav->appendChild($nextDiv);
  70         }
  71
  72         $body->appendChild($nav);
  73     }
  74 }