Subversion-Projekte lars-tiefland.php_share

<?php

/**

 * 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 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      = '';

  // -- 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->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 $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 {}

?>