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<?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)
* @copyright 2012 Adam Goforth <aag@adamgoforth.com> (Updates)
* @license http://opensource.org/licenses/mit-license.php MIT License
* @version 1.1.2 (2012-05-01)
* @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()
* @uses get()
* @uses peek()
* @return string
*/
  protected function min() {
    if (0 == strncmp($this->peek(), "\xef", 1)) {
        $this->get();
        $this->get();
        $this->get();
    }

    $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 '-':
            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 {}
?>
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