<?php /** * Combines multiple javascript files and serve up as gzip if possible. * Allowable scripts and script dependencies can be specified in a "packages.php" file * with the following format. This "packages.php" is optional, if absent the filenames * without ".js" extension are used. * * <code> * <?php * $packages = array( * 'package1' => array('file1.js', 'file2.js'), * 'package2' => array('file3.js', 'file4.js')); * * $dependencies = array( * 'package1' => array('package1'), * 'package2' => array('package1', 'package2')); //package2 requires package1 first. * </code> * * To serve up 'package1', specify the url, a maxium of 25 packages separated with commas is allows. * * clientscripts.php?js=package1 * * for 'package2' (automatically resolves 'package1') dependency * * clientscripts.php?js=package2 * * The scripts comments are removed and whitespaces removed appropriately. The * scripts may be served as zipped if the browser and php server allows it. Cache * headers are also sent to inform the browser and proxies to cache the file. * Moreover, the post-processed (comments removed and zipped) are saved in this * current directory for the next requests. * * If the url contains the parameter "mode=debug", the comments are not removed * and headers invalidating the cache are sent. In debug mode, the script can still * be zipped if the browser and server supports it. * * E.g. clientscripts.php?js=package2&mode=debug * * @link http://www.pradosoft.com/ * @copyright Copyright © 2007 PradoSoft * @license http://www.pradosoft.com/license/ * @author Wei Zhuo<weizhuo[at]gmail[dot]com> * @version $Id$ * @package System.Web.Javascripts * @since 3.1 */ //run script for as long as needed set_time_limit(0); //set error_reporting directive @error_reporting(E_ERROR | E_WARNING | E_PARSE); function get_client_script_files() { $package_file = dirname(__FILE__).'/packages.php'; if(is_file($package_file)) return get_package_files($package_file, get_script_requests()); else return get_javascript_files(get_script_requests()); } /** * @param array list of requested libraries */ function get_script_requests($max=25) { $param = isset($_GET['js']) ? $_GET['js'] : ''; if(preg_match('/([a-zA-z0-9\-_])+(,[a-zA-z0-9\-_]+)*/', $param)) return array_unique(explode(',', $param, $max)); return array(); } /** * @param string packages.php filename * @param array packages requests */ function get_package_files($package_file, $request) { list($packages, $dependencies) = include($package_file); if(!(is_array($packages) && is_array($dependencies))) { error_log('Prado client script: invalid package file '.$package_file); return array(); } $result = array(); $found = array(); foreach($request as $library) { if(isset($dependencies[$library])) { foreach($dependencies[$library] as $dep) { if(isset($found[$dep])) continue; $result = array_merge($result, (array)$packages[$dep]); $found[$dep]=true; } } else error_log('Prado client script: no such javascript library "'.$library.'"'); } return $result; } /** * @param string requested javascript files * @array array list of javascript files. */ function get_javascript_files($request) { $result = array(); foreach($request as $file) $result[] = $file.'.js'; return $result; } /** * @param array list of javascript files. * @return string combined the available javascript files. */ function combine_javascript($files) { $content = ''; $base = dirname(__FILE__); foreach($files as $file) { $filename = $base.'/'.$file; if(is_file($filename)) //relies on get_client_script_files() for security $content .= "\x0D\x0A".file_get_contents($filename); //add CR+LF else error_log('Prado client script: missing file '.$filename); } return $content; } /** * @param string javascript code * @param array files names * @return string javascript code without comments. */ function minify_javascript($content, $files) { return JSMin::minify($content); } /** * @param boolean true if in debug mode. */ function is_debug_mode() { return isset($_GET['mode']) && $_GET['mode']==='debug'; } /** * @param string javascript code * @param string gzip code */ function gzip_content($content) { return gzencode($content, 9, FORCE_GZIP); } /** * @param string javascript code. * @param string filename */ function save_javascript($content, $filename) { file_put_contents($filename, $content); if(supports_gzip_encoding()) file_put_contents($filename.'.gz', gzip_content($content)); } /** * @param string comprssed javascript file to be read * @param string javascript code, null if file is not found. */ function get_saved_javascript($filename) { $fn=$filename; if(supports_gzip_encoding()) $fn .= '.gz'; if(!is_file($fn)) save_javascript(get_javascript_code(true), $filename); return file_get_contents($fn); } /** * @return string compressed javascript file name. */ function compressed_js_filename() { $files = get_client_script_files(); if(count($files) > 0) { $filename = sprintf('%x',crc32(implode(',',($files)))); return dirname(__FILE__).'/clientscript_'.$filename.'.js'; } } /** * @param boolean true to strip comments from javascript code * @return string javascript code */ function get_javascript_code($minify=false) { $files = get_client_script_files(); if(count($files) > 0) { $content = combine_javascript($files); if($minify) return minify_javascript($content, $files); else return $content; } } /** * Prints headers to serve javascript */ function print_headers() { $expiresOffset = is_debug_mode() ? -10000 : 3600 * 24 * 10; //no cache header("Content-type: text/javascript"); header("Vary: Accept-Encoding"); // Handle proxies header("Expires: " . @gmdate("D, d M Y H:i:s", @time() + $expiresOffset) . " GMT"); if(($enc = supports_gzip_encoding()) !== null) header("Content-Encoding: " . $enc); } /** * @return string 'x-gzip' or 'gzip' if php supports gzip and browser supports gzip response, null otherwise. */ function supports_gzip_encoding() { if(isset($_GET['gzip']) && $_GET['gzip']==='false') return false; if (isset($_SERVER['HTTP_ACCEPT_ENCODING'])) { $encodings = explode(',', strtolower(preg_replace("/\s+/", "", $_SERVER['HTTP_ACCEPT_ENCODING']))); $allowsZipEncoding = in_array('gzip', $encodings) || in_array('x-gzip', $encodings) || isset($_SERVER['---------------']); $hasGzip = function_exists('ob_gzhandler'); $noZipBuffer = !ini_get('zlib.output_compression'); $noZipBufferHandler = ini_get('output_handler') != 'ob_gzhandler'; if ( $allowsZipEncoding && $hasGzip && $noZipBuffer && $noZipBufferHandler) $enc = in_array('x-gzip', $encodings) ? "x-gzip" : "gzip"; return $enc; } } /** * jsmin.php - PHP implementation of Douglas Crockford's JSMin. * * This is pretty much a direct port of jsmin.c to PHP with just a few * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and * outputs to stdout, this library accepts a string as input and returns another * string as output. * * PHP 5 or higher is required. * * Permission is hereby granted to use this version of the library under the * same terms as jsmin.c, which has the following license: * * -- * Copyright (c) 2002 Douglas Crockford (www.crockford.com) * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies * of the Software, and to permit persons to whom the Software is furnished to do * so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * The Software shall be used for Good, not Evil. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * -- * * @package JSMin * @author Ryan Grove <ryan@wonko.com> * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c) * @copyright 2007 Ryan Grove <ryan@wonko.com> (PHP port) * @license http://opensource.org/licenses/mit-license.php MIT License * @version 1.1.0 (2007-06-01) * @link http://code.google.com/p/jsmin-php/ */ class JSMin { const ORD_LF = 10; const ORD_SPACE = 32; protected $a = ''; protected $b = ''; protected $input = ''; protected $inputIndex = 0; protected $inputLength = 0; protected $lookAhead = null; protected $output = array(); // -- Public Static Methods -------------------------------------------------- public static function minify($js) { $jsmin = new JSMin($js); return $jsmin->min(); } // -- Public Instance Methods ------------------------------------------------ public function __construct($input) { $this->input = str_replace("\r\n", "\n", $input); $this->inputLength = strlen($this->input); } // -- Protected Instance Methods --------------------------------------------- protected function action($d) { switch($d) { case 1: $this->output[] = $this->a; case 2: $this->a = $this->b; if ($this->a === "'" || $this->a === '"') { for (;;) { $this->output[] = $this->a; $this->a = $this->get(); if ($this->a === $this->b) { break; } if (ord($this->a) <= self::ORD_LF) { throw new JSMinException('Unterminated string literal.'); } if ($this->a === '\\') { $this->output[] = $this->a; $this->a = $this->get(); } } } case 3: $this->b = $this->next(); if ($this->b === '/' && ( $this->a === '(' || $this->a === ',' || $this->a === '=' || $this->a === ':' || $this->a === '[' || $this->a === '!' || $this->a === '&' || $this->a === '|' || $this->a === '?')) { $this->output[] = $this->a; $this->output[] = $this->b; for (;;) { $this->a = $this->get(); if ($this->a === '/') { break; } elseif ($this->a === '\\') { $this->output[] = $this->a; $this->a = $this->get(); } elseif (ord($this->a) <= self::ORD_LF) { throw new JSMinException('Unterminated regular expression '. 'literal.'); } $this->output[] = $this->a; } $this->b = $this->next(); } } } protected function get() { $c = $this->lookAhead; $this->lookAhead = null; if ($c === null) { if ($this->inputIndex < $this->inputLength) { $c = $this->input[$this->inputIndex]; $this->inputIndex += 1; } else { $c = null; } } if ($c === "\r") { return "\n"; } if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) { return $c; } return ' '; } protected function isAlphaNum($c) { return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1; } protected function min() { $this->a = "\n"; $this->action(3); while ($this->a !== null) { switch ($this->a) { case ' ': if ($this->isAlphaNum($this->b)) { $this->action(1); } else { $this->action(2); } break; case "\n": switch ($this->b) { case '{': case '[': case '(': case '+': case '-': $this->action(1); break; case ' ': $this->action(3); break; default: if ($this->isAlphaNum($this->b)) { $this->action(1); } else { $this->action(2); } } break; default: switch ($this->b) { case ' ': if ($this->isAlphaNum($this->a)) { $this->action(1); break; } $this->action(3); break; case "\n": switch ($this->a) { case '}': case ']': case ')': case '+': case '-': case '"': case "'": $this->action(1); break; default: if ($this->isAlphaNum($this->a)) { $this->action(1); } else { $this->action(3); } } break; default: $this->action(1); break; } } } return implode('', $this->output); } protected function next() { $c = $this->get(); if ($c === '/') { switch($this->peek()) { case '/': for (;;) { $c = $this->get(); if (ord($c) <= self::ORD_LF) { return $c; } } case '*': $this->get(); for (;;) { switch($this->get()) { case '*': if ($this->peek() === '/') { $this->get(); return ' '; } break; case null: throw new JSMinException('Unterminated comment.'); } } default: return $c; } } return $c; } protected function peek() { $this->lookAhead = $this->get(); return $this->lookAhead; } } // -- Exceptions --------------------------------------------------------------- class JSMinException extends Exception {} /************** OUTPUT *****************/ if(count(get_script_requests()) > 0) { if(is_debug_mode()) { if(($code = get_javascript_code()) !== null) { print_headers(); echo supports_gzip_encoding() ? gzip_content($code) : $code; } } else { if(($filename = compressed_js_filename()) !== null) { if(!is_file($filename)) save_javascript(get_javascript_code(true), $filename); print_headers(); echo get_saved_javascript($filename); } } } ?>