<?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 {} ?>