Subversion-Projekte lars-tiefland.prado

<?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);

		}

	}

}

?>