[Summary view] [Print] [Text view]

   1  <?php
   2  /** Remove spaces and comments from JavaScript code
   3  * @param string code with commands terminated by semicolon
   4  * @return string shrinked code
   5  * @link http://vrana.github.com/JsShrink/
   6  * @author Jakub Vrana, http://www.vrana.cz/
   7  * @copyright 2007 Jakub Vrana
   8  * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
   9  * @license http://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
  10  */
  11  function jsShrink($input) {
  12      return preg_replace_callback('(
  13          (?:
  14              (^|[-+\([{}=,:;!%^&*|?~]|/(?![/*])|return|throw) # context before regexp
  15              (?:\s|//[^\n]*+\n|/\*(?:[^*]|\*(?!/))*+\*/)* # optional space
  16              (/(?![/*])(?:
  17                  \\\\[^\n]
  18                  |[^[\n/\\\\]++
  19                  |\[(?:\\\\[^\n]|[^]])++
  20              )+/) # regexp
  21              |(^
  22                  |\'(?:\\\\.|[^\n\'\\\\])*\'
  23                  |"(?:\\\\.|[^\n"\\\\])*"
  24                  |([0-9A-Za-z_$]+)
  25                  |([-+]+)
  26                  |.
  27              )
  28          )(?:\s|//[^\n]*+\n|/\*(?:[^*]|\*(?!/))*+\*/)* # optional space
  29      )sx', 'jsShrinkCallback', "$input\n");
  30  }
  31  
  32  function jsShrinkCallback($match) {
  33      static $last = '';
  34      $match += array_fill(1, 5, null); // avoid E_NOTICE
  35      list(, $context, $regexp, $result, $word, $operator) = $match;
  36      if ($word != '') {
  37          $result = ($last == 'word' ? "\n" : ($last == 'return' ? " " : "")) . $result;
  38          $last = ($word == 'return' || $word == 'throw' || $word == 'break' ? 'return' : 'word');
  39      } elseif ($operator) {
  40          $result = ($last == $operator[0] ? "\n" : "") . $result;
  41          $last = $operator[0];
  42      } else {
  43          if ($regexp) {
  44              $result = $context . ($context == '/' ? "\n" : "") . $regexp;
  45          }
  46          $last = '';
  47      }
  48      return $result;
  49  }