Initial commit

typo3conf/ext/scriptmerger/Resources/Minify/CSS.php

@@ -0,0 +1,99 @@
+<?php
+/**
+ * Class Minify_CSS
+ * @package Minify
+ */
+
+/**
+ * Minify CSS
+ *
+ * This class uses Minify_CSS_Compressor and Minify_CSS_UriRewriter to
+ * minify CSS and rewrite relative URIs.
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ * @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
+ */
+class Minify_CSS {
+
+    /**
+     * Minify a CSS string
+     *
+     * @param string $css
+     *
+     * @param array $options available options:
+     *
+     * 'preserveComments': (default true) multi-line comments that begin
+     * with "/*!" will be preserved with newlines before and after to
+     * enhance readability.
+     *
+     * 'removeCharsets': (default true) remove all @charset at-rules
+     *
+     * 'prependRelativePath': (default null) if given, this string will be
+     * prepended to all relative URIs in import/url declarations
+     *
+     * 'currentDir': (default null) if given, this is assumed to be the
+     * directory of the current CSS file. Using this, minify will rewrite
+     * all relative URIs in import/url declarations to correctly point to
+     * the desired files. For this to work, the files *must* exist and be
+     * visible by the PHP process.
+     *
+     * 'symlinks': (default = array()) If the CSS file is stored in
+     * a symlink-ed directory, provide an array of link paths to
+     * target paths, where the link paths are within the document root. Because
+     * paths need to be normalized for this to work, use "//" to substitute
+     * the doc root in the link paths (the array keys). E.g.:
+     * <code>
+     * array('//symlink' => '/real/target/path') // unix
+     * array('//static' => 'D:\\staticStorage')  // Windows
+     * </code>
+     *
+     * 'docRoot': (default = $_SERVER['DOCUMENT_ROOT'])
+     * see Minify_CSS_UriRewriter::rewrite
+     *
+     * @return string
+     */
+    public static function minify($css, $options = array())
+    {
+        $options = array_merge(array(
+            'removeCharsets' => true,
+            'preserveComments' => true,
+            'currentDir' => null,
+            'docRoot' => $_SERVER['DOCUMENT_ROOT'],
+            'prependRelativePath' => null,
+            'symlinks' => array(),
+        ), $options);
+
+        if ($options['removeCharsets']) {
+            $css = preg_replace('/@charset[^;]+;\\s*/', '', $css);
+        }
+        require_once 'CSS/Compressor.php';
+        if (! $options['preserveComments']) {
+            $css = Minify_CSS_Compressor::process($css, $options);
+        } else {
+            require_once 'CommentPreserver.php';
+            $css = Minify_CommentPreserver::process(
+                $css
+                ,array('Minify_CSS_Compressor', 'process')
+                ,array($options)
+            );
+        }
+        if (! $options['currentDir'] && ! $options['prependRelativePath']) {
+            return $css;
+        }
+        require_once 'CSS/UriRewriter.php';
+        if ($options['currentDir']) {
+            return Minify_CSS_UriRewriter::rewrite(
+                $css
+                ,$options['currentDir']
+                ,$options['docRoot']
+                ,$options['symlinks']
+            );
+        } else {
+            return Minify_CSS_UriRewriter::prepend(
+                $css
+                ,$options['prependRelativePath']
+            );
+        }
+    }
+}

typo3conf/ext/scriptmerger/Resources/Minify/CSS/Compressor.php

@@ -0,0 +1,249 @@
+<?php
+/**
+ * Class Minify_CSS_Compressor
+ * @package Minify
+ */
+
+/**
+ * Compress CSS
+ *
+ * This is a heavy regex-based removal of whitespace, unnecessary
+ * comments and tokens, and some CSS value minimization, where practical.
+ * Many steps have been taken to avoid breaking comment-based hacks,
+ * including the ie5/mac filter (and its inversion), but expect tricky
+ * hacks involving comment tokens in 'content' value strings to break
+ * minimization badly. A test suite is available.
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ * @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
+ */
+class Minify_CSS_Compressor {
+
+    /**
+     * Minify a CSS string
+     *
+     * @param string $css
+     *
+     * @param array $options (currently ignored)
+     *
+     * @return string
+     */
+    public static function process($css, $options = array())
+    {
+        $obj = new Minify_CSS_Compressor($options);
+        return $obj->_process($css);
+    }
+
+    /**
+     * @var array options
+     */
+    protected $_options = null;
+
+    /**
+     * @var bool Are we "in" a hack?
+     *
+     * I.e. are some browsers targeted until the next comment?
+     */
+    protected $_inHack = false;
+
+
+    /**
+     * Constructor
+     *
+     * @param array $options (currently ignored)
+     */
+    private function __construct($options) {
+        $this->_options = $options;
+    }
+
+    /**
+     * Minify a CSS string
+     *
+     * @param string $css
+     *
+     * @return string
+     */
+    protected function _process($css)
+    {
+        $css = str_replace("\r\n", "\n", $css);
+
+        // preserve empty comment after '>'
+        // http://www.webdevout.net/css-hacks#in_css-selectors
+        $css = preg_replace('@>/\\*\\s*\\*/@', '>/*keep*/', $css);
+
+        // preserve empty comment between property and value
+        // http://css-discuss.incutio.com/?page=BoxModelHack
+        $css = preg_replace('@/\\*\\s*\\*/\\s*:@', '/*keep*/:', $css);
+        $css = preg_replace('@:\\s*/\\*\\s*\\*/@', ':/*keep*/', $css);
+
+        // apply callback to all valid comments (and strip out surrounding ws
+        $css = preg_replace_callback('@\\s*/\\*([\\s\\S]*?)\\*/\\s*@'
+            ,array($this, '_commentCB'), $css);
+
+        // remove ws around { } and last semicolon in declaration block
+        $css = preg_replace('/\\s*{\\s*/', '{', $css);
+        $css = preg_replace('/;?\\s*}\\s*/', '}', $css);
+
+        // remove ws surrounding semicolons
+        $css = preg_replace('/\\s*;\\s*/', ';', $css);
+
+        // remove ws around urls
+        $css = preg_replace('/
+                url\\(      # url(
+                \\s*
+                ([^\\)]+?)  # 1 = the URL (really just a bunch of non right parenthesis)
+                \\s*
+                \\)         # )
+            /x', 'url($1)', $css);
+
+        // remove ws between rules and colons
+        $css = preg_replace('/
+                \\s*
+                ([{;])              # 1 = beginning of block or rule separator
+                \\s*
+                ([\\*_]?[\\w\\-]+)  # 2 = property (and maybe IE filter)
+                \\s*
+                :
+                \\s*
+                (\\b|[#\'"-])        # 3 = first character of a value
+            /x', '$1$2:$3', $css);
+
+        // remove ws in selectors
+        $css = preg_replace_callback('/
+                (?:              # non-capture
+                    \\s*
+                    [^~>+,\\s]+  # selector part
+                    \\s*
+                    [,>+~]       # combinators
+                )+
+                \\s*
+                [^~>+,\\s]+      # selector part
+                {                # open declaration block
+            /x'
+            ,array($this, '_selectorsCB'), $css);
+
+        // minimize hex colors
+        $css = preg_replace('/([^=])#([a-f\\d])\\2([a-f\\d])\\3([a-f\\d])\\4([\\s;\\}])/i'
+            , '$1#$2$3$4$5', $css);
+
+        // remove spaces between font families
+        $css = preg_replace_callback('/font-family:([^;}]+)([;}])/'
+            ,array($this, '_fontFamilyCB'), $css);
+
+        $css = preg_replace('/@import\\s+url/', '@import url', $css);
+
+        // replace any ws involving newlines with a single newline
+        $css = preg_replace('/[ \\t]*\\n+\\s*/', "\n", $css);
+
+        // separate common descendent selectors w/ newlines (to limit line lengths)
+        $css = preg_replace('/([\\w#\\.\\*]+)\\s+([\\w#\\.\\*]+){/', "$1\n$2{", $css);
+
+        // Use newline after 1st numeric value (to limit line lengths).
+        $css = preg_replace('/
+            ((?:padding|margin|border|outline):\\d+(?:px|em)?) # 1 = prop : 1st numeric value
+            \\s+
+            /x'
+            ,"$1\n", $css);
+
+        // prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
+        $css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css);
+
+        return trim($css);
+    }
+
+    /**
+     * Replace what looks like a set of selectors
+     *
+     * @param array $m regex matches
+     *
+     * @return string
+     */
+    protected function _selectorsCB($m)
+    {
+        // remove ws around the combinators
+        return preg_replace('/\\s*([,>+~])\\s*/', '$1', $m[0]);
+    }
+
+    /**
+     * Process a comment and return a replacement
+     *
+     * @param array $m regex matches
+     *
+     * @return string
+     */
+    protected function _commentCB($m)
+    {
+        $hasSurroundingWs = (trim($m[0]) !== $m[1]);
+        $m = $m[1];
+        // $m is the comment content w/o the surrounding tokens,
+        // but the return value will replace the entire comment.
+        if ($m === 'keep') {
+            return '/**/';
+        }
+        if ($m === '" "') {
+            // component of http://tantek.com/CSS/Examples/midpass.html
+            return '/*" "*/';
+        }
+        if (preg_match('@";\\}\\s*\\}/\\*\\s+@', $m)) {
+            // component of http://tantek.com/CSS/Examples/midpass.html
+            return '/*";}}/* */';
+        }
+        if ($this->_inHack) {
+            // inversion: feeding only to one browser
+            if (preg_match('@
+                    ^/               # comment started like /*/
+                    \\s*
+                    (\\S[\\s\\S]+?)  # has at least some non-ws content
+                    \\s*
+                    /\\*             # ends like /*/ or /**/
+                @x', $m, $n)) {
+                // end hack mode after this comment, but preserve the hack and comment content
+                $this->_inHack = false;
+                return "/*/{$n[1]}/**/";
+            }
+        }
+        if (substr($m, -1) === '\\') { // comment ends like \*/
+            // begin hack mode and preserve hack
+            $this->_inHack = true;
+            return '/*\\*/';
+        }
+        if ($m !== '' && $m[0] === '/') { // comment looks like /*/ foo */
+            // begin hack mode and preserve hack
+            $this->_inHack = true;
+            return '/*/*/';
+        }
+        if ($this->_inHack) {
+            // a regular comment ends hack mode but should be preserved
+            $this->_inHack = false;
+            return '/**/';
+        }
+        // Issue 107: if there's any surrounding whitespace, it may be important, so
+        // replace the comment with a single space
+        return $hasSurroundingWs // remove all other comments
+            ? ' '
+            : '';
+    }
+
+    /**
+     * Process a font-family listing and return a replacement
+     *
+     * @param array $m regex matches
+     *
+     * @return string
+     */
+    protected function _fontFamilyCB($m)
+    {
+        // Issue 210: must not eliminate WS between words in unquoted families
+        $pieces = preg_split('/(\'[^\']+\'|"[^"]+")/', $m[1], null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
+        $out = 'font-family:';
+        while (null !== ($piece = array_shift($pieces))) {
+            if ($piece[0] !== '"' && $piece[0] !== "'") {
+                $piece = preg_replace('/\\s+/', ' ', $piece);
+                $piece = preg_replace('/\\s?,\\s?/', ',', $piece);
+            }
+            $out .= $piece;
+        }
+        return $out . $m[2];
+    }
+}

typo3conf/ext/scriptmerger/Resources/Minify/CSS/UriRewriter.php

@@ -0,0 +1,290 @@
+<?php
+/**
+ * Class Minify_CSS_UriRewriter
+ * @package Minify
+ */
+
+/**
+ * Rewrite file-relative URIs as root-relative in CSS files
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_CSS_UriRewriter {
+
+    /**
+     * rewrite() and rewriteRelative() append debugging information here
+     * @var string
+     */
+    public static $debugText = '';
+
+    /**
+     * In CSS content, rewrite file relative URIs as root relative
+     *
+     * @param string $css
+     *
+     * @param string $currentDir The directory of the current CSS file.
+     *
+     * @param string $docRoot The document root of the web site in which
+     * the CSS file resides (default = $_SERVER['DOCUMENT_ROOT']).
+     *
+     * @param array $symlinks (default = array()) If the CSS file is stored in
+     * a symlink-ed directory, provide an array of link paths to
+     * target paths, where the link paths are within the document root. Because
+     * paths need to be normalized for this to work, use "//" to substitute
+     * the doc root in the link paths (the array keys). E.g.:
+     * <code>
+     * array('//symlink' => '/real/target/path') // unix
+     * array('//static' => 'D:\\staticStorage')  // Windows
+     * </code>
+     *
+     * @return string
+     */
+    public static function rewrite($css, $currentDir, $docRoot = null, $symlinks = array())
+    {
+        self::$_docRoot = self::_realpath(
+            $docRoot ? $docRoot : $_SERVER['DOCUMENT_ROOT']
+        );
+        self::$_currentDir = self::_realpath($currentDir);
+        self::$_symlinks = array();
+
+        // normalize symlinks
+        foreach ($symlinks as $link => $target) {
+            $link = ($link === '//')
+                ? self::$_docRoot
+                : str_replace('//', self::$_docRoot . '/', $link);
+            $link = strtr($link, '/', DIRECTORY_SEPARATOR);
+            self::$_symlinks[$link] = self::_realpath($target);
+        }
+
+        self::$debugText .= "docRoot    : " . self::$_docRoot . "\n"
+                          . "currentDir : " . self::$_currentDir . "\n";
+        if (self::$_symlinks) {
+            self::$debugText .= "symlinks : " . var_export(self::$_symlinks, 1) . "\n";
+        }
+        self::$debugText .= "\n";
+
+        $css = self::_trimUrls($css);
+
+        // rewrite
+        $css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
+            ,array(self::$className, '_processUriCB'), $css);
+        $css = preg_replace_callback('/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
+            ,array(self::$className, '_processUriCB'), $css);
+
+        return $css;
+    }
+
+    /**
+     * In CSS content, prepend a path to relative URIs
+     *
+     * @param string $css
+     *
+     * @param string $path The path to prepend.
+     *
+     * @return string
+     */
+    public static function prepend($css, $path)
+    {
+        self::$_prependPath = $path;
+
+        $css = self::_trimUrls($css);
+
+        // append
+        $css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
+            ,array(self::$className, '_processUriCB'), $css);
+        $css = preg_replace_callback('/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
+            ,array(self::$className, '_processUriCB'), $css);
+
+        self::$_prependPath = null;
+        return $css;
+    }
+
+    /**
+     * Get a root relative URI from a file relative URI
+     *
+     * <code>
+     * Minify_CSS_UriRewriter::rewriteRelative(
+     *       '../img/hello.gif'
+     *     , '/home/user/www/css'  // path of CSS file
+     *     , '/home/user/www'      // doc root
+     * );
+     * // returns '/img/hello.gif'
+     *
+     * // example where static files are stored in a symlinked directory
+     * Minify_CSS_UriRewriter::rewriteRelative(
+     *       'hello.gif'
+     *     , '/var/staticFiles/theme'
+     *     , '/home/user/www'
+     *     , array('/home/user/www/static' => '/var/staticFiles')
+     * );
+     * // returns '/static/theme/hello.gif'
+     * </code>
+     *
+     * @param string $uri file relative URI
+     *
+     * @param string $realCurrentDir realpath of the current file's directory.
+     *
+     * @param string $realDocRoot realpath of the site document root.
+     *
+     * @param array $symlinks (default = array()) If the file is stored in
+     * a symlink-ed directory, provide an array of link paths to
+     * real target paths, where the link paths "appear" to be within the document
+     * root. E.g.:
+     * <code>
+     * array('/home/foo/www/not/real/path' => '/real/target/path') // unix
+     * array('C:\\htdocs\\not\\real' => 'D:\\real\\target\\path')  // Windows
+     * </code>
+     *
+     * @return string
+     */
+    public static function rewriteRelative($uri, $realCurrentDir, $realDocRoot, $symlinks = array())
+    {
+        // prepend path with current dir separator (OS-independent)
+        $path = strtr($realCurrentDir, '/', DIRECTORY_SEPARATOR)
+            . DIRECTORY_SEPARATOR . strtr($uri, '/', DIRECTORY_SEPARATOR);
+
+        self::$debugText .= "file-relative URI  : {$uri}\n"
+                          . "path prepended     : {$path}\n";
+
+        // "unresolve" a symlink back to doc root
+        foreach ($symlinks as $link => $target) {
+            if (0 === strpos($path, $target)) {
+                // replace $target with $link
+                $path = $link . substr($path, strlen($target));
+
+                self::$debugText .= "symlink unresolved : {$path}\n";
+
+                break;
+            }
+        }
+        // strip doc root
+        $path = substr($path, strlen($realDocRoot));
+
+        self::$debugText .= "docroot stripped   : {$path}\n";
+
+        // fix to root-relative URI
+
+        $uri = strtr($path, '/\\', '//');
+
+        $uri = self::removeDots($uri);
+
+        self::$debugText .= "traversals removed : {$uri}\n\n";
+
+        return $uri;
+    }
+
+    /**
+     * Remove instances of "./" and "../" where possible from a root-relative URI
+     * @param string $uri
+     * @return string
+     */
+    public static function removeDots($uri)
+    {
+        $uri = str_replace('/./', '/', $uri);
+        // inspired by patch from Oleg Cherniy
+        do {
+            $uri = preg_replace('@/[^/]+/\\.\\./@', '/', $uri, 1, $changed);
+        } while ($changed);
+        return $uri;
+    }
+
+    /**
+     * Defines which class to call as part of callbacks, change this
+     * if you extend Minify_CSS_UriRewriter
+     * @var string
+     */
+    protected static $className = 'Minify_CSS_UriRewriter';
+
+    /**
+     * Get realpath with any trailing slash removed. If realpath() fails,
+     * just remove the trailing slash.
+     *
+     * @param string $path
+     *
+     * @return mixed path with no trailing slash
+     */
+    protected static function _realpath($path)
+    {
+        $realPath = realpath($path);
+        if ($realPath !== false) {
+            $path = $realPath;
+        }
+        return rtrim($path, '/\\');
+    }
+
+    /**
+     * @var string directory of this stylesheet
+     */
+    private static $_currentDir = '';
+
+    /**
+     * @var string DOC_ROOT
+     */
+    private static $_docRoot = '';
+
+    /**
+     * @var array directory replacements to map symlink targets back to their
+     * source (within the document root) E.g. '/var/www/symlink' => '/var/realpath'
+     */
+    private static $_symlinks = array();
+
+    /**
+     * @var string path to prepend
+     */
+    private static $_prependPath = null;
+
+    private static function _trimUrls($css)
+    {
+        return preg_replace('/
+            url\\(      # url(
+            \\s*
+            ([^\\)]+?)  # 1 = URI (assuming does not contain ")")
+            \\s*
+            \\)         # )
+        /x', 'url($1)', $css);
+    }
+
+    private static function _processUriCB($m)
+    {
+        // $m matched either '/@import\\s+([\'"])(.*?)[\'"]/' or '/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
+        $isImport = ($m[0][0] === '@');
+        // determine URI and the quote character (if any)
+        if ($isImport) {
+            $quoteChar = $m[1];
+            $uri = $m[2];
+        } else {
+            // $m[1] is either quoted or not
+            $quoteChar = ($m[1][0] === "'" || $m[1][0] === '"')
+                ? $m[1][0]
+                : '';
+            $uri = ($quoteChar === '')
+                ? $m[1]
+                : substr($m[1], 1, strlen($m[1]) - 2);
+        }
+        // analyze URI
+        if ('/' !== $uri[0]                  // root-relative
+            && false === strpos($uri, '//')  // protocol (non-data)
+            && 0 !== strpos($uri, 'data:')   // data protocol
+        ) {
+            // URI is file-relative: rewrite depending on options
+            if (self::$_prependPath === null) {
+                $uri = self::rewriteRelative($uri, self::$_currentDir, self::$_docRoot, self::$_symlinks);
+            } else {
+                $uri = self::$_prependPath . $uri;
+                if ($uri[0] === '/') {
+                    $root = '';
+                    $rootRelative = $uri;
+                    $uri = $root . self::removeDots($rootRelative);
+                } elseif (preg_match('@^((https?\:)?//([^/]+))/@', $uri, $m) && (false !== strpos($m[3], '.'))) {
+                    $root = $m[1];
+                    $rootRelative = substr($uri, strlen($root));
+                    $uri = $root . self::removeDots($rootRelative);
+                }
+            }
+        }
+        return $isImport
+            ? "@import {$quoteChar}{$uri}{$quoteChar}"
+            : "url({$quoteChar}{$uri}{$quoteChar})";
+    }
+}

typo3conf/ext/scriptmerger/Resources/Minify/CommentPreserver.php

@@ -0,0 +1,89 @@
+<?php
+/**
+ * Class Minify_CommentPreserver 
+ * @package Minify
+ */
+
+/**
+ * Process a string in pieces preserving C-style comments that begin with "/*!"
+ * 
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_CommentPreserver {
+    
+    /**
+     * String to be prepended to each preserved comment
+     *
+     * @var string
+     */
+    public static $prepend = "\n";
+    
+    /**
+     * String to be appended to each preserved comment
+     *
+     * @var string
+     */
+    public static $append = "\n";
+    
+    /**
+     * Process a string outside of C-style comments that begin with "/*!"
+     *
+     * On each non-empty string outside these comments, the given processor 
+     * function will be called. The comments will be surrounded by 
+     * Minify_CommentPreserver::$preprend and Minify_CommentPreserver::$append.
+     * 
+     * @param string $content
+     * @param callback $processor function
+     * @param array $args array of extra arguments to pass to the processor 
+     * function (default = array())
+     * @return string
+     */
+    public static function process($content, $processor, $args = array())
+    {
+        $ret = '';
+        while (true) {
+            list($beforeComment, $comment, $afterComment) = self::_nextComment($content);
+            if ('' !== $beforeComment) {
+                $callArgs = $args;
+                array_unshift($callArgs, $beforeComment);
+                $ret .= call_user_func_array($processor, $callArgs);    
+            }
+            if (false === $comment) {
+                break;
+            }
+            $ret .= $comment;
+            $content = $afterComment;
+        }
+        return $ret;
+    }
+    
+    /**
+     * Extract comments that YUI Compressor preserves.
+     * 
+     * @param string $in input
+     * 
+     * @return array 3 elements are returned. If a YUI comment is found, the
+     * 2nd element is the comment and the 1st and 3rd are the surrounding
+     * strings. If no comment is found, the entire string is returned as the 
+     * 1st element and the other two are false.
+     */
+    private static function _nextComment($in)
+    {
+        if (
+            false === ($start = strpos($in, '/*!'))
+            || false === ($end = strpos($in, '*/', $start + 3))
+        ) {
+            return array($in, false, false);
+        }
+        $ret = array(
+            substr($in, 0, $start)
+            ,self::$prepend . '/*!' . substr($in, $start + 3, $end - $start - 1) . self::$append
+        );
+        $endChars = (strlen($in) - $end - 2);
+        $ret[] = (0 === $endChars)
+            ? ''
+            : substr($in, -$endChars);
+        return $ret;
+    }
+}

typo3conf/ext/scriptmerger/Resources/Minify/ImportProcessor.php

@@ -0,0 +1,189 @@
+<?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;
+    }
+
+// ##################### BEGIN TYPO3 modification
+
+	/**
+	 * @var array
+	 */
+	public static $extensionConfiguration = array();
+
+// ##################### END TYPO3 modification
+
+    private function _getContent($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[] = $file;
+        $this->_currentDir = dirname($file);
+
+// ##################### BEGIN TYPO3 modification
+		if (strpos($this->_currentDir, realpath(\TYPO3\CMS\Core\Utility\GeneralUtility::getIndpEnv('TYPO3_DOCUMENT_ROOT'))) === FALSE) {
+			$realPathToTYPO3 = str_replace('typo3/', '', realpath(PATH_typo3));
+			$this->_currentDir = str_replace($realPathToTYPO3, '', $this->_currentDir);
+			$this->_currentDir = realpath(PATH_site) . '/typo3' . $this->_currentDir;
+		}
+// ##################### END TYPO3 modification
+
+        // remove UTF-8 BOM if present
+        if (pack("CCC",0xef,0xbb,0xbf) === substr($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
+// ##################### BEGIN TYPO3 modification
+			} elseif (strpos($url, 'data:image') !== FALSE) {
+				// probably starts with an inline image, do not alter
+// ##################### END TYPO3 modification
+            } 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);
+            }
+        }
+
+// ##################### BEGIN TYPO3 modification
+
+		if (trim(self::$extensionConfiguration['css.']['postUrlProcessing.']['pattern']) !== '') {
+			$pattern = self::$extensionConfiguration['css.']['postUrlProcessing.']['pattern'];
+			$replacement = self::$extensionConfiguration['css.']['postUrlProcessing.']['replacement'];
+			$url = preg_replace($pattern, $replacement, $url);
+		}
+
+// ##################### END TYPO3 modification
+
+        return "url({$quote}{$url}{$quote})";
+    }
+}