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<?php
namespace JchOptimize;
/**
* This is a regular expressions based implementation of the JSMin algorithim as decsribed on
* Douglas Crockford's page at http://www.crockford.com/javascript/jsmin.html in PHP and also
* guided by the PHP port written by Ryan Grove <ryan@wonko.com>
*
* This was written to provide a PHP tool to minify javascript but with an emphasis on speed,
* in particular for tools that want to minify javascript on the fly such as http://www.jch-optimize.net.
* Based on independent comparison tests, this library consistently returns the same results as JSMin.php
* but on an average of 200 times faster.
*
* 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.
* --
*
* @author Samuel Marshall <sdmarshall73@gmail.com>
* @copyright (c) 2002, Douglas Crockford <douglas@crockford.com> (jsmin.c)
* @copyright (c) 2014, Samuel Marshall <sdmarshall73@gmail.com> (JSMinRegex.php)
* @license http://opensource.org/licenses/mit-license.php MIT License
*
*/
class JSMinRegex
{
protected $options = array();
public static function minify($js, $options = array())
{
$oMinifyJs = new JSMinRegex($options);
return $oMinifyJs->process($js);
}
private function __construct($options)
{
$this->options = $options;
}
protected function process($js)
{
//replace carriage return with line feeds
$js = str_replace(array("\r\n", "\r"), "\n", $js);
//convert all other control characters to space
$js = preg_replace('#[\t\f]#S', ' ', $js);
//regex for double quoted strings
$s1 = '"(?>(?:\\\\.)?[^\\\\"]*+)+?"';
//regex for single quoted string
$s2 = "'(?>(?:\\\\.)?[^\\\\']*+)+?'";
//regex for block comments
$b = '/\*(?>[^/\*]++|//|\*(?!/)|(?<!\*)/)*+\*/';
//regex for line comments
$c = '//[^\n]*+';
//We have to do some manipulating with regexp literals; Their pattern is a little 'irregular' but
//they need to be escaped
//
//characters that can precede a regexp literal
$x1 = '[(,=:[!&|?+\-~*{;\n]';
//keywords that can precede a regex literal
$x2 = '\bcase|\belse|\bin|\breturn|\btypeof';
//actual regexp literal
$x3 = '/(?![/*])(?>(?(?=\\\\)\\\\.|\[(?>(?:\\\\.)?[^\]\n]*+)+?\])?[^\\\\/\n\[]*+)+?/';
//spaces not followed by possible regexp
$y = '[ ]*+(?!/(?![*/]))';
//spaces not preceded by $x1 or $x2 and possibly followed by / that is not part of a comment
$z = "(?<!$x1|$x2)[ ]*+(?:/(?![/*]))?";
//Remove spaces before regexp literals preserving space after keywords
$js = preg_replace("#(?>[^'\"/ ]*+(?>$s1|$s2|$b|$c|$y|$z)?)*?\K(?>(?<=$x1)[ ]*+($x3)|(?<=$x2)([ ])[ ]*+($x3)|$)#siS", '$1$2$3', $js);
//regex for complete regexp literal
$x = "(?<={$x1}|\bcase |\belse |\bin |\breturn |\btypeof ){$x3}";
//remove comments
$js = preg_replace("#(?>[^'\"/]*+(?>{$s1}|{$s2}|{$x}|/(?![*/]))?)*?\K(?>{$b}|{$c}|$)#siS", '', $js);
//replace runs of whitespace with single space or linefeed
$js = preg_replace("#(?>[^'\"/\n ]*+(?>{$s1}|{$s2}|{$x}|[ \n](?![ \n])|/)?)*?\K(?>[ ]++(?=\n)|\n\K\s++|[ ]\K[ ]++|$)#siS", '', $js);
//if regex literal ends line (without modifiers) insert semicolon
$js = preg_replace("#({$x})\n(?![!\#%&`*./,:;<=>?@\^|~}\])\"'])#siS", '$1;', $js);
//regex for removing spaces
//remove space except when a space is preceded and followed by a non-ASCII character or by an ASCII letter or digit,
//or by one of these characters \ $ _ ...ie., all ASCII characters except those listed.
$sp = '(?:(?<=(?P<s>["\'!\#%&`()*./,:;<=>?@\[\]\^{}|~])) | (?=(?P>s))|(?<=(?P<p>[+\-])) (?!\k<p>)|(?<=[^+\-]) (?!([^+\-])))';
//spaces to keep
$k1 = '(?<=[a-z0-9\\\\$_]) (?=[a-z0-9\\\\$_])';
//regex for removing linefeeds
//remove linefeeds except if it precedes a non-ASCII character or an ASCII letter or digit or one of these
//characters: \ $ _ [ ( { + - and if it follows a non-ASCII character or an ASCII letter or digit or one of these
//characters: \ $ _ ] ) } + - " ' ...ie., all ASCII characters except those listed respectively
$ln = '(?:(?<=[!\#%&`*./,:;<=>?@\^|~{\[(])\n|\n(?=[!\#%&`*./,:;<=>?@\^|~}\])"\']))';
//line feeds to keep
$k2 = '(?<=[a-z0-9\\\\$_\])}+\-"\'])\n(?=[a-z0-9\\\\$_\[({+\-])';
//remove unnecessary linefeeds and spaces
$js = preg_replace("#(?>[^'\"/\n ]*+(?>$s1|$s2|(?<={$x1}){$x3}|(?<={$x2})[ ]{$x3}|/|$k1|$k2)?)*?\K(?>$sp|$ln|$)#siS", '', $js);
return trim($js);
}
}