class JSMin in Javascript Aggregator 5

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 <[e-mail]> @copyright 2002 Douglas Crockford <[e-mail]> (jsmin.c) @copyright 2008 Ryan Grove <[e-mail]> (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/

Hierarchy

• class \JSMin

File

./jsmin.php, line 48

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;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
JSMin::$a	protected	property
JSMin::$b	protected	property
JSMin::$input	protected	property
JSMin::$inputIndex	protected	property
JSMin::$inputLength	protected	property
JSMin::$lookAhead	protected	property
JSMin::$output	protected	property
JSMin::action	protected	function
JSMin::get	protected	function
JSMin::isAlphaNum	protected	function
JSMin::min	protected	function
JSMin::minify	public static	function
JSMin::next	protected	function
JSMin::ORD_LF		constant
JSMin::ORD_SPACE		constant
JSMin::peek	protected	function
JSMin::__construct	public	function