From f7d780b9b82a664525120a90a8b1cb25be57d0e0 Mon Sep 17 00:00:00 2001
From: Gabriel Birke <gabriel.birke@gmail.com>
Date: Sun, 9 Jan 2011 13:18:19 +0100
Subject: Preserve @import statements in CSS

---
 lib/exe/css.php | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

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

diff --git a/lib/exe/css.php b/lib/exe/css.php
index e64ebc22a..eb2d96513 100644
--- a/lib/exe/css.php
+++ b/lib/exe/css.php
@@ -122,6 +122,9 @@ function css_out(){
 
     // apply style replacements
     $css = css_applystyle($css,$tplinc);
+    
+    // place all @import statements at the top of the file
+    $css = css_moveimports($css);
 
     // compress whitespace and comments
     if($conf['compress']){
@@ -265,6 +268,7 @@ function css_loadfile($file,$location=''){
     if(!$location) return $css;
 
     $css = preg_replace('#(url\([ \'"]*)((?!/|http://|https://| |\'|"))#','\\1'.$location.'\\3',$css);
+    $css = preg_replace('#(@import\s+[\'"])((?!/|http://|https://))#', '\\1'.$location.'\\2"', $css);
     return $css;
 }
 
@@ -296,6 +300,29 @@ function css_pluginstyles($mode='screen'){
     return $list;
 }
 
+/**
+ * Move all @import statements in a combined stylesheet to the top so they
+ * aren't ignored by the browser. 
+ *
+ * @author Gabriel Birke <birke@d-scribe.de>
+ */
+function css_moveimports($css)
+{
+    if(!preg_match_all('/@import\s+(?:url\([^)]+\)|"[^"]+")\s*[^;]*;\s*/', $css, $matches, PREG_OFFSET_CAPTURE)) {
+        return $css;
+    }
+    $newCss  = "";
+    $imports = "";
+    $offset  = 0;
+    foreach($matches[0] as $match) {
+        $newCss  .= substr($css, $offset, $match[1] - $offset);
+        $imports .= $match[0];
+        $offset   = $match[1] + strlen($match[0]);
+    }
+    $newCss .= substr($css, $offset);
+    return $imports.$newCss;
+}
+
 /**
  * Very simple CSS optimizer
  *
-- 
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