From 1e2c59485b8396275abde11d047a4a42a4e4e335 Mon Sep 17 00:00:00 2001
From: Christopher Smith <chris@jalakai.co.uk>
Date: Tue, 26 Nov 2013 19:39:05 +0000
Subject: improved comments for code associated with PR#407 & PR#408

---
 lib/exe/css.php | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

(limited to 'lib/exe/css.php')

diff --git a/lib/exe/css.php b/lib/exe/css.php
index c2540cc03..c96dedd37 100644
--- a/lib/exe/css.php
+++ b/lib/exe/css.php
@@ -312,6 +312,11 @@ function css_styleini($tpl) {
     );
 }
 
+/**
+ * Amend paths used in replacement relative urls, refer FS#2879
+ *
+ * @author Chris Smith <chris@jalakai.co.uk>
+ */
 function css_fixreplacementurls($replacements, $location) {
     foreach($replacements as $key => $value) {
         $replacements[$key] = preg_replace('#(url\([ \'"]*)(?!/|data:|http://|https://| |\'|")#','\\1'.$location,$value);
@@ -400,16 +405,29 @@ function css_loadfile($file,$location=''){
     return $css_file->load($location);
 }
 
+/**
+ *  Helper class to abstract loading of css/less files
+ *
+ *  @author Chris Smith <chris@jalakai.co.uk>
+ */
 class DokuCssFile {
 
-    protected $filepath;
-    protected $location;
+    protected $filepath;             // file system path to the CSS/Less file
+    protected $location;             // base url location of the CSS/Less file
     private   $relative_path = null;
 
     public function __construct($file) {
         $this->filepath = $file;
     }
 
+    /**
+     * Load the contents of the css/less file and adjust any relative paths/urls (relative to this file) to be
+     * relative to the dokuwiki root: the web root (DOKU_BASE) for most files; the file system root (DOKU_INC)
+     * for less files.
+     *
+     * @param   string   $location   base url for this file
+     * @return  string               the CSS/Less contents of the file
+     */
     public function load($location='') {
         if (!@file_exists($this->filepath)) return '';
 
@@ -424,10 +442,17 @@ class DokuCssFile {
         return $css;
     }
 
+    /**
+     * Get the relative file system path of this file, relative to dokuwiki's root folder, DOKU_INC
+     *
+     * @return string   relative file system path
+     */
     private function getRelativePath(){
 
         if (is_null($this->relative_path)) {
             $basedir = array(DOKU_INC);
+
+            // during testing, files may be found relative to a second base dir, TMP_DIR
             if (defined('DOKU_UNITTEST')) {
                 $basedir[] = realpath(TMP_DIR);
             }
@@ -439,16 +464,26 @@ class DokuCssFile {
         return $this->relative_path;
     }
 
+    /**
+     * preg_replace callback to adjust relative urls from relative to this file to relative
+     * to the appropriate dokuwiki root location as described in the code
+     *
+     * @param  array    see http://php.net/preg_replace_callback
+     * @return string   see http://php.net/preg_replace_callback
+     */
     public function replacements($match) {
 
+        // not a relative url? - no adjustment required
         if (preg_match('#^(/|data:|https?://)#',$match[3])) {
             return $match[0];
         }
+        // a less file import? - requires a file system location
         else if (substr($match[3],-5) == '.less') {
             if ($match[3]{0} != '/') {
                 $match[3] = $this->getRelativePath() . '/' . $match[3];
             }
         }
+        // everything else requires a url adjustment
         else {
             $match[3] = $this->location . $match[3];
         }
-- 
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