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Code Editor : Minify.php

<?php
/**
 * Class Minify  
 * @package Minify
 */

/**
 * Minify_Source
 */
require_once 'Minify/Source.php';
 
/**
 * Minify - Combines, minifies, and caches JavaScript and CSS files on demand.
 *
 * See README for usage instructions (for now).
 *
 * This library was inspired by {@link mailto:flashkot@mail.ru jscsscomp by Maxim Martynyuk}
 * and by the article {@link http://www.hunlock.com/blogs/Supercharged_Javascript "Supercharged JavaScript" by Patrick Hunlock}.
 *
 * Requires PHP 5.1.0.
 * Tested on PHP 5.1.6.
 *
 * @package Minify
 * @author Ryan Grove <ryan@wonko.com>
 * @author Stephen Clay <steve@mrclay.org>
 * @copyright 2008 Ryan Grove, Stephen Clay. All rights reserved.
 * @license http://opensource.org/licenses/bsd-license.php  New BSD License
 * @link http://code.google.com/p/minify/
 */
class Minify {
    
    const VERSION = '2.1.5';
    const TYPE_CSS = 'text/css';
    const TYPE_HTML = 'text/html';
    // there is some debate over the ideal JS Content-Type, but this is the
    // Apache default and what Yahoo! uses..
    const TYPE_JS = 'application/x-javascript';
    const URL_DEBUG = 'http://code.google.com/p/minify/wiki/Debugging';
    
    /**
     * How many hours behind are the file modification times of uploaded files?
     * 
     * If you upload files from Windows to a non-Windows server, Windows may report
     * incorrect mtimes for the files. Immediately after modifying and uploading a 
     * file, use the touch command to update the mtime on the server. If the mtime 
     * jumps ahead by a number of hours, set this variable to that number. If the mtime 
     * moves back, this should not be needed.
     *
     * @var int $uploaderHoursBehind
     */
    public static $uploaderHoursBehind = 0;
    
    /**
     * If this string is not empty AND the serve() option 'bubbleCssImports' is
     * NOT set, then serve() will check CSS files for @import declarations that
     * appear too late in the combined stylesheet. If found, serve() will prepend
     * the output with this warning.
     *
     * @var string $importWarning
     */
    public static $importWarning = "/* See http://code.google.com/p/minify/wiki/CommonProblems#@imports_can_appear_in_invalid_locations_in_combined_CSS_files */\n";

/**
     * Has the DOCUMENT_ROOT been set in user code?
     * 
     * @var bool
     */
    public static $isDocRootSet = false;

/**
     * Specify a cache object (with identical interface as Minify_Cache_File) or
     * a path to use with Minify_Cache_File.
     * 
     * If not called, Minify will not use a cache and, for each 200 response, will 
     * need to recombine files, minify and encode the output.
     *
     * @param mixed $cache object with identical interface as Minify_Cache_File or
     * a directory path, or null to disable caching. (default = '')
     * 
     * @param bool $fileLocking (default = true) This only applies if the first
     * parameter is a string.
     *
     * @return null
     */
    public static function setCache($cache = '', $fileLocking = true)
    {
        if (is_string($cache)) {
            require_once 'Minify/Cache/File.php';
            self::$_cache = new Minify_Cache_File($cache, $fileLocking);
        } else {
            self::$_cache = $cache;
        }
    }
    
    /**
     * Serve a request for a minified file. 
     * 
     * Here are the available options and defaults in the base controller:
     * 
     * 'isPublic' : send "public" instead of "private" in Cache-Control 
     * headers, allowing shared caches to cache the output. (default true)
     * 
     * 'quiet' : set to true to have serve() return an array rather than sending
     * any headers/output (default false)
     * 
     * 'encodeOutput' : set to false to disable content encoding, and not send
     * the Vary header (default true)
     * 
     * 'encodeMethod' : generally you should let this be determined by 
     * HTTP_Encoder (leave null), but you can force a particular encoding
     * to be returned, by setting this to 'gzip' or '' (no encoding)
     * 
     * 'encodeLevel' : level of encoding compression (0 to 9, default 9)
     * 
     * 'contentTypeCharset' : appended to the Content-Type header sent. Set to a falsey
     * value to remove. (default 'utf-8')  
     * 
     * 'maxAge' : set this to the number of seconds the client should use its cache
     * before revalidating with the server. This sets Cache-Control: max-age and the
     * Expires header. Unlike the old 'setExpires' setting, this setting will NOT
     * prevent conditional GETs. Note this has nothing to do with server-side caching.
     * 
     * 'rewriteCssUris' : If true, serve() will automatically set the 'currentDir'
     * minifier option to enable URI rewriting in CSS files (default true)
     * 
     * 'bubbleCssImports' : If true, all @import declarations in combined CSS
     * files will be move to the top. Note this may alter effective CSS values
     * due to a change in order. (default false)
     * 
     * 'debug' : set to true to minify all sources with the 'Lines' controller, which
     * eases the debugging of combined files. This also prevents 304 responses.
     * @see Minify_Lines::minify()
     * 
     * 'minifiers' : to override Minify's default choice of minifier function for 
     * a particular content-type, specify your callback under the key of the 
     * content-type:
     * <code>
     * // call customCssMinifier($css) for all CSS minification
     * $options['minifiers'][Minify::TYPE_CSS] = 'customCssMinifier';
     * 
     * // don't minify Javascript at all
     * $options['minifiers'][Minify::TYPE_JS] = '';
     * </code>
     * 
     * 'minifierOptions' : to send options to the minifier function, specify your options
     * under the key of the content-type. E.g. To send the CSS minifier an option: 
     * <code>
     * // give CSS minifier array('optionName' => 'optionValue') as 2nd argument 
     * $options['minifierOptions'][Minify::TYPE_CSS]['optionName'] = 'optionValue';
     * </code>
     * 
     * 'contentType' : (optional) this is only needed if your file extension is not 
     * js/css/html. The given content-type will be sent regardless of source file
     * extension, so this should not be used in a Groups config with other
     * Javascript/CSS files.
     * 
     * Any controller options are documented in that controller's setupSources() method.
     * 
     * @param mixed $controller instance of subclass of Minify_Controller_Base or string
     * name of controller. E.g. 'Files'
     * 
     * @param array $options controller/serve options
     * 
     * @return mixed null, or, if the 'quiet' option is set to true, an array
     * with keys "success" (bool), "statusCode" (int), "content" (string), and
     * "headers" (array).
     */
    public static function serve($controller, $options = array())
    {
        if (! self::$isDocRootSet && 0 === stripos(PHP_OS, 'win')) {
            self::setDocRoot();
        }

if (is_string($controller)) {
            // make $controller into object
            $class = 'Minify_Controller_' . $controller;
            if (! class_exists($class, false)) {
                require_once "Minify/Controller/" 
                    . str_replace('_', '/', $controller) . ".php";    
            }
            $controller = new $class();
            /* @var Minify_Controller_Base $controller */
        }
        
        // set up controller sources and mix remaining options with
        // controller defaults
        $options = $controller->setupSources($options);
        $options = $controller->analyzeSources($options);
        self::$_options = $controller->mixInDefaultOptions($options);
        
        // check request validity
        if (! $controller->sources) {
            // invalid request!
            if (! self::$_options['quiet']) {
                self::_errorExit(self::$_options['badRequestHeader'], self::URL_DEBUG);
            } else {
                list(,$statusCode) = explode(' ', self::$_options['badRequestHeader']);
                return array(
                    'success' => false
                    ,'statusCode' => (int)$statusCode
                    ,'content' => ''
                    ,'headers' => array()
                );
            }
        }
        
        self::$_controller = $controller;
        
        if (self::$_options['debug']) {
            self::_setupDebug($controller->sources);
            self::$_options['maxAge'] = 0;
        }
        
        // determine encoding
        if (self::$_options['encodeOutput']) {
            $sendVary = true;
            if (self::$_options['encodeMethod'] !== null) {
                // controller specifically requested this
                $contentEncoding = self::$_options['encodeMethod'];
            } else {
                // sniff request header
                require_once 'HTTP/Encoder.php';
                // depending on what the client accepts, $contentEncoding may be 
                // 'x-gzip' while our internal encodeMethod is 'gzip'. Calling
                // getAcceptedEncoding(false, false) leaves out compress and deflate as options.
                list(self::$_options['encodeMethod'], $contentEncoding) = HTTP_Encoder::getAcceptedEncoding(false, false);
                $sendVary = ! HTTP_Encoder::isBuggyIe();
            }
        } else {
            self::$_options['encodeMethod'] = ''; // identity (no encoding)
        }
        
        // check client cache
        require_once 'HTTP/ConditionalGet.php';
        $cgOptions = array(
            'lastModifiedTime' => self::$_options['lastModifiedTime']
            ,'isPublic' => self::$_options['isPublic']
            ,'encoding' => self::$_options['encodeMethod']
        );
        if (self::$_options['maxAge'] > 0) {
            $cgOptions['maxAge'] = self::$_options['maxAge'];
        } elseif (self::$_options['debug']) {
            $cgOptions['invalidate'] = true;
        }
        $cg = new HTTP_ConditionalGet($cgOptions);
        if ($cg->cacheIsValid) {
            // client's cache is valid
            if (! self::$_options['quiet']) {
                $cg->sendHeaders();
                return;
            } else {
                return array(
                    'success' => true
                    ,'statusCode' => 304
                    ,'content' => ''
                    ,'headers' => $cg->getHeaders()
                );
            }
        } else {
            // client will need output
            $headers = $cg->getHeaders();
            unset($cg);
        }
        
        if (self::$_options['contentType'] === self::TYPE_CSS
            && self::$_options['rewriteCssUris']) {
            foreach($controller->sources as $key => $source) {
                if ($source->filepath 
                    && !isset($source->minifyOptions['currentDir'])
                    && !isset($source->minifyOptions['prependRelativePath'])
                ) {
                    $source->minifyOptions['currentDir'] = dirname($source->filepath);
                }
            }
        }
        
        // check server cache
        if (null !== self::$_cache && ! self::$_options['debug']) {
            // using cache
            // the goal is to use only the cache methods to sniff the length and 
            // output the content, as they do not require ever loading the file into
            // memory.
            $cacheId = self::_getCacheId();
            $fullCacheId = (self::$_options['encodeMethod'])
                ? $cacheId . '.gz'
                : $cacheId;
            // check cache for valid entry
            $cacheIsReady = self::$_cache->isValid($fullCacheId, self::$_options['lastModifiedTime']); 
            if ($cacheIsReady) {
                $cacheContentLength = self::$_cache->getSize($fullCacheId);    
            } else {
                // generate & cache content
                try {
                    $content = self::_combineMinify();
                } catch (Exception $e) {
                    self::$_controller->log($e->getMessage());
                    if (! self::$_options['quiet']) {
                        self::_errorExit(self::$_options['errorHeader'], self::URL_DEBUG);
                    }
                    throw $e;
                }
                self::$_cache->store($cacheId, $content);
                if (function_exists('gzencode')) {
                    self::$_cache->store($cacheId . '.gz', gzencode($content, self::$_options['encodeLevel']));
                }
            }
        } else {
            // no cache
            $cacheIsReady = false;
            try {
                $content = self::_combineMinify();
            } catch (Exception $e) {
                self::$_controller->log($e->getMessage());
                if (! self::$_options['quiet']) {
                    self::_errorExit(self::$_options['errorHeader'], self::URL_DEBUG);
                }
                throw $e;
            }
        }
        if (! $cacheIsReady && self::$_options['encodeMethod']) {
            // still need to encode
            $content = gzencode($content, self::$_options['encodeLevel']);
        }
        
        // add headers
        $headers['Content-Length'] = $cacheIsReady
            ? $cacheContentLength
            : ((function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
                ? mb_strlen($content, '8bit')
                : strlen($content)
            );
        $headers['Content-Type'] = self::$_options['contentTypeCharset']
            ? self::$_options['contentType'] . '; charset=' . self::$_options['contentTypeCharset']
            : self::$_options['contentType'];
        if (self::$_options['encodeMethod'] !== '') {
            $headers['Content-Encoding'] = $contentEncoding;
        }
        if (self::$_options['encodeOutput'] && $sendVary) {
            $headers['Vary'] = 'Accept-Encoding';
        }

if (! self::$_options['quiet']) {
            // output headers & content
            foreach ($headers as $name => $val) {
                header($name . ': ' . $val);
            }
            if ($cacheIsReady) {
                self::$_cache->display($fullCacheId);
            } else {
                echo $content;
            }
        } else {
            return array(
                'success' => true
                ,'statusCode' => 200
                ,'content' => $cacheIsReady
                    ? self::$_cache->fetch($fullCacheId)
                    : $content
                ,'headers' => $headers
            );
        }
    }
    
    /**
     * Return combined minified content for a set of sources
     *
     * No internal caching will be used and the content will not be HTTP encoded.
     * 
     * @param array $sources array of filepaths and/or Minify_Source objects
     * 
     * @param array $options (optional) array of options for serve. By default
     * these are already set: quiet = true, encodeMethod = '', lastModifiedTime = 0.
     * 
     * @return string
     */
    public static function combine($sources, $options = array())
    {
        $cache = self::$_cache;
        self::$_cache = null;
        $options = array_merge(array(
            'files' => (array)$sources
            ,'quiet' => true
            ,'encodeMethod' => ''
            ,'lastModifiedTime' => 0
        ), $options);
        $out = self::serve('Files', $options);
        self::$_cache = $cache;
        return $out['content'];
    }
    
    /**
     * Set $_SERVER['DOCUMENT_ROOT']. On IIS, the value is created from SCRIPT_FILENAME and SCRIPT_NAME.
     * 
     * @param string $docRoot value to use for DOCUMENT_ROOT
     */
    public static function setDocRoot($docRoot = '')
    {
        self::$isDocRootSet = true;
        if ($docRoot) {
            $_SERVER['DOCUMENT_ROOT'] = $docRoot;
        } elseif (isset($_SERVER['SERVER_SOFTWARE'])
                  && 0 === strpos($_SERVER['SERVER_SOFTWARE'], 'Microsoft-IIS/')) {
            $_SERVER['DOCUMENT_ROOT'] = substr(
                $_SERVER['SCRIPT_FILENAME']
                ,0
                ,strlen($_SERVER['SCRIPT_FILENAME']) - strlen($_SERVER['SCRIPT_NAME']));
            $_SERVER['DOCUMENT_ROOT'] = rtrim($_SERVER['DOCUMENT_ROOT'], '\\');
        }
    }
    
    /**
     * Any Minify_Cache_* object or null (i.e. no server cache is used)
     *
     * @var Minify_Cache_File
     */
    private static $_cache = null;
    
    /**
     * Active controller for current request
     *
     * @var Minify_Controller_Base
     */
    protected static $_controller = null;
    
    /**
     * Options for current request
     *
     * @var array
     */
    protected static $_options = null;

/**
     * @param string $header
     *
     * @param string $url
     */
    protected static function _errorExit($header, $url)
    {
        $url = htmlspecialchars($url, ENT_QUOTES);
        list(,$h1) = explode(' ', $header, 2);
        $h1 = htmlspecialchars($h1);
        // FastCGI environments require 3rd arg to header() to be set
        list(, $code) = explode(' ', $header, 3);
        header($header, true, $code);
        header('Content-Type: text/html; charset=utf-8');
        echo "<h1>$h1</h1>";
        echo "<p>Please see <a href='$url'>$url</a>.</p>";
        exit();
    }

/**
     * Set up sources to use Minify_Lines
     *
     * @param array $sources Minify_Source instances
     */
    protected static function _setupDebug($sources)
    {
        foreach ($sources as $source) {
            $source->minifier = array('Minify_Lines', 'minify');
            $id = $source->getId();
            $source->minifyOptions = array(
                'id' => (is_file($id) ? basename($id) : $id)
            );
        }
    }
    
    /**
     * Combines sources and minifies the result.
     *
     * @return string
     */
    protected static function _combineMinify()
    {
        $type = self::$_options['contentType']; // ease readability
        
        // when combining scripts, make sure all statements separated and
        // trailing single line comment is terminated
        $implodeSeparator = ($type === self::TYPE_JS)
            ? "\n;"
            : '';
        // allow the user to pass a particular array of options to each
        // minifier (designated by type). source objects may still override
        // these
        $defaultOptions = isset(self::$_options['minifierOptions'][$type])
            ? self::$_options['minifierOptions'][$type]
            : array();
        // if minifier not set, default is no minification. source objects
        // may still override this
        $defaultMinifier = isset(self::$_options['minifiers'][$type])
            ? self::$_options['minifiers'][$type]
            : false;

// process groups of sources with identical minifiers/options
        $content = array();
        $i = 0;
        $l = count(self::$_controller->sources);
        $groupToProcessTogether = array();
        $lastMinifier = null;
        $lastOptions = null;
        do {
            // get next source
            $source = null;
            if ($i < $l) {
                $source = self::$_controller->sources[$i];
                /* @var Minify_Source $source */
                $sourceContent = $source->getContent();

// allow the source to override our minifier and options
                $minifier = (null !== $source->minifier)
                    ? $source->minifier
                    : $defaultMinifier;
                $options = (null !== $source->minifyOptions)
                    ? array_merge($defaultOptions, $source->minifyOptions)
                    : $defaultOptions;
            }
            // do we need to process our group right now?
            if ($i > 0                               // yes, we have at least the first group populated
                && (
                    ! $source                        // yes, we ran out of sources
                    || $type === self::TYPE_CSS      // yes, to process CSS individually (avoiding PCRE bugs/limits)
                    || $minifier !== $lastMinifier   // yes, minifier changed
                    || $options !== $lastOptions)    // yes, options changed
                )
            {
                // minify previous sources with last settings
                $imploded = implode($implodeSeparator, $groupToProcessTogether);
                $groupToProcessTogether = array();
                if ($lastMinifier) {
                    self::$_controller->loadMinifier($lastMinifier);
                    try {
                        $content[] = call_user_func($lastMinifier, $imploded, $lastOptions);
                    } catch (Exception $e) {
                        throw new Exception("Exception in minifier: " . $e->getMessage());
                    }
                } else {
                    $content[] = $imploded;
                }
            }
            // add content to the group
            if ($source) {
                $groupToProcessTogether[] = $sourceContent;
                $lastMinifier = $minifier;
                $lastOptions = $options;
            }
            $i++;
        } while ($source);

$content = implode($implodeSeparator, $content);
        
        if ($type === self::TYPE_CSS && false !== strpos($content, '@import')) {
            $content = self::_handleCssImports($content);
        }
        
        // do any post-processing (esp. for editing build URIs)
        if (self::$_options['postprocessorRequire']) {
            require_once self::$_options['postprocessorRequire'];
        }
        if (self::$_options['postprocessor']) {
            $content = call_user_func(self::$_options['postprocessor'], $content, $type);
        }
        return $content;
    }
    
    /**
     * Make a unique cache id for for this request.
     * 
     * Any settings that could affect output are taken into consideration  
     *
     * @param string $prefix
     *
     * @return string
     */
    protected static function _getCacheId($prefix = 'minify')
    {
        $name = preg_replace('/[^a-zA-Z0-9\\.=_,]/', '', self::$_controller->selectionId);
        $name = preg_replace('/\\.+/', '.', $name);
        $name = substr($name, 0, 200 - 34 - strlen($prefix));
        $md5 = md5(serialize(array(
            Minify_Source::getDigest(self::$_controller->sources)
            ,self::$_options['minifiers'] 
            ,self::$_options['minifierOptions']
            ,self::$_options['postprocessor']
            ,self::$_options['bubbleCssImports']
            ,self::VERSION
        )));
        return "{$prefix}_{$name}_{$md5}";
    }
    
    /**
     * Bubble CSS @imports to the top or prepend a warning if an import is detected not at the top.
     *
     * @param string $css
     *
     * @return string
     */
    protected static function _handleCssImports($css)
    {
        if (self::$_options['bubbleCssImports']) {
            // bubble CSS imports
            preg_match_all('/@import.*?;/', $css, $imports);
            $css = implode('', $imports[0]) . preg_replace('/@import.*?;/', '', $css);
        } else if ('' !== self::$importWarning) {
            // remove comments so we don't mistake { in a comment as a block
            $noCommentCss = preg_replace('@/\\*[\\s\\S]*?\\*/@', '', $css);
            $lastImportPos = strrpos($noCommentCss, '@import');
            $firstBlockPos = strpos($noCommentCss, '{');
            if (false !== $lastImportPos
                && false !== $firstBlockPos
                && $firstBlockPos < $lastImportPos
            ) {
                // { appears before @import : prepend warning
                $css = self::$importWarning . $css;
            }
        }
        return $css;
    }
}

${this.title}

Code Editor : Minify.php