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<?php
namespace JchOptimize;
/**
* This is a regular expressions based implementation of the JSMin algorithim in PHP as described
* on Douglas Crockford's page at http://www.crockford.com/javascript/jsmin.html 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> (JS_Optimize.php)
* @license http://opensource.org/licenses/mit-license.php MIT License
*
*/
class JS_Optimize extends Optimize
{
protected $_prepareOnly;
public static function optimize($js, $options = array())
{
$oMinifyJs = new JS_Optimize($options);
return $oMinifyJs->_optimize($js);
}
private function __construct($options)
{
foreach ($options as $key => $value)
{
$this->{'_' . $key} = $value;
}
}
private function _optimize($js)
{
//regex for double quoted strings
$s1 = self::DOUBLE_QUOTE_STRING;
//regex for single quoted string
$s2 = self::SINGLE_QUOTE_STRING;
//regex for block comments
$b = self::BLOCK_COMMENTS;
//regex for line comments
$c = self::LINE_COMMENTS;
//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 = '[(.<>%,=:[!&|?+\-~*{;\r\n^]';
//keywords that can precede a regex literal
$x2 = '\breturn|\bthrow|\btypeof|\bcase|\bdelete|\bdo|\belse|\bin|\binstanceof|\bnew|\bvoid';
//actual regexp literal
$x3 = '/(?![/*])(?>(?(?=\\\\)\\\\.|\[(?>(?:\\\\.)?[^\]\r\n]*+)+?\])?[^\\\\/\r\n\[]*+)+?/';
//ambiguous characters
$x4 = '[)}]';
//methods and properties
$x5 = 'compile|exec|test|toString|constructor|global|ignoreCase|lastIndex|multiline|source';
//regex for complete regexp literal
$x = "(?>(?=/)(?<={$x1}|$x2)(?<!\+\+|--){$x3}"
. "|(?=/)(?<={$x4}){$x3}(?=\.(?>{$x5})))";
//control characters excluding \r, \
$ws = '\x00-\x09\x0B\x0C\x0E-\x1F\x7F';
//Remove spaces before regexp literals
$rx = "#(?>[$ws ]*+(?(?=[^'\"/]*+(?<=[$ws ])/)[^'\"/$ws ]*+(?(?=['\"/])(?>$s1|$s2|$b|$c|$x|/)?)"
. "|[^'\"/]*+(?>$s1|$s2|$b|$c|$x|/)?))*?\K"
. "(?>(?=[$ws ]++/)(?:(?<=$x1|$x2)(?>[$ws ]++($x3))|(?<=$x4)(?>[$ws ]++($x3))(?=\.(?>$x5)))|$)#si";
$js = $this->_replace($rx, '$1$2', $js, '1');
if (isset($this->_prepareOnly) && $this->_prepareOnly == TRUE)
{
global $REGEXP_LITERAL;
$REGEXP_LITERAL = $x;
return $js;
}
//replace line comments with line feed
$rx = "#(?>[^'\"/]*+(?>{$s1}|{$s2}|{$x}|{$b}|/(?![*/]))?)*?\K(?>{$c}|$)#si";
$js = $this->_replace($rx, "\n", $js, '2');
//replace block comments with single space
$rx = "#(?>[^'\"/]*+(?>{$s1}|{$s2}|{$x}|/(?![*/]))?)*?\K(?>{$b}|$)#si";
$js = $this->_replace($rx, ' ', $js, '3');
//convert carriage returns to line feeds
$rx = "#(?>[^'\"/\\r]*+(?>$s1|$s2|$x|/)?)*?\K(?>\\r\\n?|$)#si";
$js = $this->_replace($rx, "\n", $js, '4');
//convert all other control characters to space
$rx = "#(?>[^'\"/$ws]*+(?>$s1|$s2|$x|/)?)*?\K(?>[$ws]++|$)#si";
$js = $this->_replace($rx, ' ', $js, '5');
//replace runs of whitespace with single space or linefeed
$rx = "#(?>[^'\"/\\n ]*+(?>{$s1}|{$s2}|{$x}|[ \\n](?![ \\n])|/)?)*?\K(?:[ ]++(?=\\n)|\\n\K\s++|[ ]\K[ ]++|$)#si";
$js = $this->_replace($rx, '', $js, '6');
//if regex literal ends line (without modifiers) insert semicolon
$rx = "#(?>[/]?[^'\"/]*+(?>$s1|$s2|$x(?!\\n))?)*?(?:$x\K\\n(?![!\#%&`*./,:;<=>?@\^|~}\])\"'])|\K$)#si";
$js = $this->_replace($rx, ';', $js, '7');
//clean up
$rx = '#.+\K;$#s';
$js = $this->_replace($rx, '', $js, '8');
//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.
$c = '["\'!\#%&`()*./,:;<=>?@\[\]\^{}|~+\-]';
$sp = "(?<=$c) | (?=$c)";
//Non-ASCII characters
$na = '[^\x00-\x7F]';
//spaces to keep
$k1 = "(?<=[\$_a-z0-9\\\\]|$na) (?=[\$_a-z0-9\\\\]|$na)|(?<=\+) (?=\+)|(?<=-) (?=-)";
//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\\\\\])}+\-\"']|$na)\n(?=[!\$_a-z0-9\\\\\[({+\-]|$na)";
//remove unnecessary linefeeds and spaces
$rx = "#(?>[^'\"/\\n ]*+(?>$s1|$s2|$x|/|$k1|$k2)?)*?\K(?>$sp|$ln|$)#si";
$js = $this->_replace($rx, '', $js, '9');
$js = trim($js);
return $js;
}
}