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