<?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) {
        $c = substr($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 ' ';
  }
 
  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 {}
?>