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phorge-phorge/externals/JsShrink/jsShrink.php
epriestley 0569218201 Use JsShrink if jsxmin is not available
Summary: If `jsxmin` is not available, use a pure PHP implementation instead (JsShrink).

Test Plan:
  - Ran `arc lint --lintall` on all JS and fixed every relevant warning.
  - Forced minification on and browsed around the site using JS behaviors. Didn't hit anything problematic.

Reviewers: vrana, btrahan

Reviewed By: vrana

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5670
2013-05-18 17:04:22 -07:00

45 lines
1.5 KiB
PHP

<?php
/** Remove spaces and comments from JavaScript code
* @param string code with commands terminated by semicolon
* @return string shrinked code
* @link http://vrana.github.com/JsShrink/
* @author Jakub Vrana, http://www.vrana.cz/
* @copyright 2007 Jakub Vrana
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
* @license http://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
*/
function jsShrink($input) {
return preg_replace_callback('(
(?:
(^|[-+\([{}=,:;!%^&*|?~]|/(?![/*])|return|throw) # context before regexp
(?:\s|//[^\n]*+\n|/\*(?:[^*]|\*(?!/))*+\*/)* # optional space
(/(?![/*])(?:\\\\[^\n]|[^[\n/\\\\]|\[(?:\\\\[^\n]|[^]])++)+/) # regexp
|(^
|\'(?:\\\\.|[^\n\'\\\\])*\'
|"(?:\\\\.|[^\n"\\\\])*"
|([0-9A-Za-z_$]+)
|([-+]+)
|.
)
)(?:\s|//[^\n]*+\n|/\*(?:[^*]|\*(?!/))*+\*/)* # optional space
)sx', 'jsShrinkCallback', "$input\n");
}
function jsShrinkCallback($match) {
static $last = '';
$match += array_fill(1, 5, null); // avoid E_NOTICE
list(, $context, $regexp, $result, $word, $operator) = $match;
if ($word != '') {
$result = ($last == 'word' ? "\n" : ($last == 'return' ? " " : "")) . $result;
$last = ($word == 'return' || $word == 'throw' || $word == 'break' ? 'return' : 'word');
} elseif ($operator) {
$result = ($last == $operator[0] ? "\n" : "") . $result;
$last = $operator[0];
} else {
if ($regexp) {
$result = $context . ($context == '/' ? "\n" : "") . $regexp;
}
$last = '';
}
return $result;
}