XHTMLCompiler/DOMFilter/AutoStyle.php

   1 <?php
   2
   3 /**
   4  * Automatically adds external style-sheet inclusions based on file
   5  * naming conventions.
   6  * @todo Extend this to also glob CSS files into one file for better
   7  *       downloads
   8  */
   9 class XHTMLCompiler_DOMFilter_AutoStyle extends XHTMLCompiler_DOMFilter
  10 {
  11
  12     protected $name = 'AutoStyle';
  13
  14     public function process(DOMDocument $dom, $page, $manager) {
  15
  16         $head = $this->query("//html:head")->item(0);
  17         $links = $this->query('link', $head);
  18
  19         $manager->addDependency(__FILE__);
  20
  21         $preloaded = array();
  22         $prefix = $page->getDirSName();
  23         foreach ($links as $link) {
  24             // ensure the link is importing CSS stylesheets
  25             if ($link->getAttribute('rel') != 'stylesheet') continue;
  26             if ($link->getAttribute('type') != 'text/css') continue;
  27             $path = $link->getAttribute('href');
  28             if (empty($path) || $path[0] === '/' || $path[0] === '.') {
  29                 // do not attempt to manage special paths
  30                 continue;
  31             }
  32             $preloaded[$prefix . $path] = true;
  33         }
  34
  35         $dir = $page->getDir();
  36         $css_files = $dir->scanFlat('.css');
  37         $base = $page->getPathStem();
  38
  39         foreach ($css_files as $file) {
  40             // determine whether or not it should be included
  41             // TODO: extend this algorithm to allow different media
  42             // types in form pagename.mediatype.css
  43             if (strpos($file, $base) === 0) {
  44                 // if already included, don't re-include
  45                 if (isset($preloaded[$file])) continue;
  46                 $link = $dom->createElement('link');
  47                 $link->setAttribute('rel', 'stylesheet');
  48                 $link->setAttribute('type', 'text/css');
  49                 // because scanFlat() prepends the directory name to
  50                 // each of the files, in a web-context we need to remove
  51                 // it
  52                 $link->setAttribute('href', basename($file));
  53                 $head->appendChild($link);
  54             }
  55         }
  56
  57     }
  58
  59 }