Minify_js.php | searchcode

/libraries/Minify/drivers/Minify_js.php

https://github.com/k1ng440/CodeIgniter-Minify
PHP | 414 lines | 237 code | 42 blank | 135 comment | 31 complexity | 222aec9d9bfc6de5561465255364903a MD5 | raw file

<?php

/**

 * @name		CodeIgniter Minify

 * @author		Jens Segers

 * @link		http://www.jenssegers.be

 * @license		MIT License Copyright (c) 2012 Jens Segers

 * 

 * 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 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.

 */



if (!defined("BASEPATH"))

    exit("No direct script access allowed");



class Minify_js extends Minify_Driver {

    

    /* (non-PHPdoc)

     * @see Minify_Driver::minify()

     */

    public function min($source) {

        return trim(JSMin::minify($source));

    }

    

}



/**

 * 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 2008 Ryan Grove <ryan@wonko.com> (PHP port)

 * @license http://opensource.org/licenses/mit-license.php MIT License

 * @version 1.1.1 (2008-03-02)

 * @link https://github.com/rgrove/jsmin-php/

 */



class JSMin {

  const ORD_LF            = 10;

  const ORD_SPACE         = 32;

  const ACTION_KEEP_A     = 1;

  const ACTION_DELETE_A   = 2;

  const ACTION_DELETE_A_B = 3;



  protected $a           = '';

  protected $b           = '';

  protected $input       = '';

  protected $inputIndex  = 0;

  protected $inputLength = 0;

  protected $lookAhead   = null;

  protected $output      = '';



  // -- Public Static Methods --------------------------------------------------



  /**

   * Minify Javascript

   *

   * @uses __construct()

   * @uses min()

   * @param string $js Javascript to be minified

   * @return string

   */

  public static function minify($js) {

    $jsmin = new JSMin($js);

    return $jsmin->min();

  }



  // -- Public Instance Methods ------------------------------------------------



  /**

   * Constructor

   *

   * @param string $input Javascript to be minified

   */

  public function __construct($input) {

    $this->input       = str_replace("\r\n", "\n", $input);

    $this->inputLength = strlen($this->input);

  }



  // -- Protected Instance Methods ---------------------------------------------



  /**

   * Action -- do something! What to do is determined by the $command argument.

   *

   * action treats a string as a single character. Wow!

   * action recognizes a regular expression if it is preceded by ( or , or =.

   *

   * @uses next()

   * @uses get()

   * @throws JSMinException If parser errors are found:

   *         - Unterminated string literal

   *         - Unterminated regular expression set in regex literal

   *         - Unterminated regular expression literal

   * @param int $command One of class constants:

   *      ACTION_KEEP_A      Output A. Copy B to A. Get the next B.

   *      ACTION_DELETE_A    Copy B to A. Get the next B. (Delete A).

   *      ACTION_DELETE_A_B  Get the next B. (Delete B).

  */

  protected function action($command) {

    switch($command) {

      case self::ACTION_KEEP_A:

        $this->output .= $this->a;



      case self::ACTION_DELETE_A:

        $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 self::ACTION_DELETE_A_B:

        $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->a === '{' || $this->a === '}' || $this->a === ';' ||

            $this->a === "\n" )) {



          $this->output .= $this->a . $this->b;



          for (;;) {

            $this->a = $this->get();



            if ($this->a === '[') {

              /*

                inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:

                  return Form.Validator.getValidator('IsEmpty').test(element) || (/^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]\.?){0,63}[a-z0-9!#$%&'*+/=?^_`{|}~-]@(?:(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)*[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\])$/i).test(element.get('value'));

              */

              for (;;) {

                $this->output .= $this->a;

                $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 set in regex literal.');

                }

              }

            } elseif ($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();

        }

    }

  }



  /**

   * Get next char. Convert ctrl char to space.

   *

   * @return string|null

   */

  protected function get() {

    $c = $this->lookAhead;

    $this->lookAhead = null;



    if ($c === null) {

      if ($this->inputIndex < $this->inputLength) {

        $c = substr($this->input, $this->inputIndex, 1);

        $this->inputIndex += 1;

      } else {

        $c = null;

      }

    }



    if ($c === "\r") {

      return "\n";

    }



    if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {

      return $c;

    }



    return ' ';

  }



  /**

   * Is $c a letter, digit, underscore, dollar sign, or non-ASCII character.

   *

   * @return bool

   */

  protected function isAlphaNum($c) {

    return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;

  }



  /**

   * Perform minification, return result

   *

   * @uses action()

   * @uses isAlphaNum()

   * @return string

   */

  protected function min() {

    $this->a = "\n";

    $this->action(self::ACTION_DELETE_A_B);



    while ($this->a !== null) {

      switch ($this->a) {

        case ' ':

          if ($this->isAlphaNum($this->b)) {

            $this->action(self::ACTION_KEEP_A);

          } else {

            $this->action(self::ACTION_DELETE_A);

          }

          break;



        case "\n":

          switch ($this->b) {

            case '{':

            case '[':

            case '(':

            case '+':

            case '-':

              $this->action(self::ACTION_KEEP_A);

              break;



            case ' ':

              $this->action(self::ACTION_DELETE_A_B);

              break;



            default:

              if ($this->isAlphaNum($this->b)) {

                $this->action(self::ACTION_KEEP_A);

              }

              else {

                $this->action(self::ACTION_DELETE_A);

              }

          }

          break;



        default:

          switch ($this->b) {

            case ' ':

              if ($this->isAlphaNum($this->a)) {

                $this->action(self::ACTION_KEEP_A);

                break;

              }



              $this->action(self::ACTION_DELETE_A_B);

              break;



            case "\n":

              switch ($this->a) {

                case '}':

                case ']':

                case ')':

                case '+':

                case '-':

                case '"':

                case "'":

                  $this->action(self::ACTION_KEEP_A);

                  break;



                default:

                  if ($this->isAlphaNum($this->a)) {

                    $this->action(self::ACTION_KEEP_A);

                  }

                  else {

                    $this->action(self::ACTION_DELETE_A_B);

                  }

              }

              break;



            default:

              $this->action(self::ACTION_KEEP_A);

              break;

          }

      }

    }



    return $this->output;

  }



  /**

   * Get the next character, skipping over comments. peek() is used to see

   *  if a '/' is followed by a '/' or '*'.

   *

   * @uses get()

   * @uses peek()

   * @throws JSMinException On unterminated comment.

   * @return string

   */

  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;

  }



  /**

   * Get next char. If is ctrl character, translate to a space or newline.

   *

   * @uses get()

   * @return string|null

   */

  protected function peek() {

    $this->lookAhead = $this->get();

    return $this->lookAhead;

  }

}



// -- Exceptions ---------------------------------------------------------------

class JSMinException extends Exception {}

?>