1 files changed, 157 insertions, 0 deletions
diff --git a/min/lib/Minify/ImportProcessor.php b/min/lib/Minify/ImportProcessor.php
new file mode 100644
index 0000000..0d6d90a
--- /dev/null
+++ b/min/lib/Minify/ImportProcessor.php
@@ -0,0 +1,157 @@
+<?php
+/**
+ * Class Minify_ImportProcessor  
+ * @package Minify
+ */
+
+/**
+ * Linearize a CSS/JS file by including content specified by CSS import
+ * declarations. In CSS files, relative URIs are fixed.
+ * 
+ * @imports will be processed regardless of where they appear in the source 
+ * files; i.e. @imports commented out or in string content will still be
+ * processed!
+ * 
+ * This has a unit test but should be considered "experimental".
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_ImportProcessor {
+    
+    public static $filesIncluded = array();
+    
+    public static function process($file)
+    {
+        self::$filesIncluded = array();
+        self::$_isCss = (strtolower(substr($file, -4)) === '.css');
+        $obj = new Minify_ImportProcessor(dirname($file));
+        return $obj->_getContent($file);
+    }
+    
+    // allows callback funcs to know the current directory
+    private $_currentDir = null;
+    
+    // allows _importCB to write the fetched content back to the obj
+    private $_importedContent = '';
+    
+    private static $_isCss = null;
+    
+    private function __construct($currentDir)
+    {
+        $this->_currentDir = $currentDir;
+    }
+    
+    private function _getContent($file)
+    {
+        $file = realpath($file);
+        if (! $file
+            || in_array($file, self::$filesIncluded)
+            || false === ($content = @file_get_contents($file))
+        ) {
+            // file missing, already included, or failed read
+            return '';
+        }
+        self::$filesIncluded[] = realpath($file);
+        $this->_currentDir = dirname($file);
+        
+        // remove UTF-8 BOM if present
+        if (pack("CCC",0xef,0xbb,0xbf) === substr($content, 0, 3)) {
+            $content = substr($content, 3);
+        }
+        // ensure uniform EOLs
+        $content = str_replace("\r\n", "\n", $content);
+        
+        // process @imports
+        $content = preg_replace_callback(
+            '/
+                @import\\s+
+                (?:url\\(\\s*)?      # maybe url(
+                [\'"]?               # maybe quote
+                (.*?)                # 1 = URI
+                [\'"]?               # maybe end quote
+                (?:\\s*\\))?         # maybe )
+                ([a-zA-Z,\\s]*)?     # 2 = media list
+                ;                    # end token
+            /x'
+            ,array($this, '_importCB')
+            ,$content
+        );
+        
+        if (self::$_isCss) {
+            // rewrite remaining relative URIs
+            $content = preg_replace_callback(
+                '/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
+                ,array($this, '_urlCB')
+                ,$content
+            );
+        }
+        
+        return $this->_importedContent . $content;
+    }
+    
+    private function _importCB($m)
+    {
+        $url = $m[1];
+        $mediaList = preg_replace('/\\s+/', '', $m[2]);
+        
+        if (strpos($url, '://') > 0) {
+            // protocol, leave in place for CSS, comment for JS
+            return self::$_isCss
+                ? $m[0]
+                : "/* Minify_ImportProcessor will not include remote content */";
+        }
+        if ('/' === $url[0]) {
+            // protocol-relative or root path
+            $url = ltrim($url, '/');
+            $file = realpath($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR
+                . strtr($url, '/', DIRECTORY_SEPARATOR);
+        } else {
+            // relative to current path
+            $file = $this->_currentDir . DIRECTORY_SEPARATOR 
+                . strtr($url, '/', DIRECTORY_SEPARATOR);
+        }
+        $obj = new Minify_ImportProcessor(dirname($file));
+        $content = $obj->_getContent($file);
+        if ('' === $content) {
+            // failed. leave in place for CSS, comment for JS
+            return self::$_isCss
+                ? $m[0]
+                : "/* Minify_ImportProcessor could not fetch '{$file}' */";;
+        }
+        return (!self::$_isCss || preg_match('@(?:^$|\\ball\\b)@', $mediaList))
+            ? $content
+            : "@media {$mediaList} {\n{$content}\n}\n";
+    }
+    
+    private function _urlCB($m)
+    {
+        // $m[1] is either quoted or not
+        $quote = ($m[1][0] === "'" || $m[1][0] === '"')
+            ? $m[1][0]
+            : '';
+        $url = ($quote === '')
+            ? $m[1]
+            : substr($m[1], 1, strlen($m[1]) - 2);
+        if ('/' !== $url[0]) {
+            if (strpos($url, '//') > 0) {
+                // probably starts with protocol, do not alter
+            } else {
+                // prepend path with current dir separator (OS-independent)
+                $path = $this->_currentDir 
+                    . DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR);
+                // strip doc root
+                $path = substr($path, strlen(realpath($_SERVER['DOCUMENT_ROOT'])));
+                // fix to absolute URL
+                $url = strtr($path, '/\\', '//');
+                // remove /./ and /../ where possible
+                $url = str_replace('/./', '/', $url);
+                // inspired by patch from Oleg Cherniy
+                do {
+                    $url = preg_replace('@/[^/]+/\\.\\./@', '/', $url, 1, $changed);
+                } while ($changed);
+            }
+        }
+        return "url({$quote}{$url}{$quote})";
+    }
+}