[19576] | 1 | <?php |
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| 2 | /** |
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| 3 | * JShrink |
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| 4 | * |
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| 5 | * Copyright (c) 2009-2012, Robert Hafner <tedivm@tedivm.com>. |
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| 6 | * All rights reserved. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * |
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| 12 | * * Redistributions of source code must retain the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer. |
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| 14 | * |
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| 15 | * * Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in |
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| 17 | * the documentation and/or other materials provided with the |
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| 18 | * distribution. |
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| 19 | * |
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| 20 | * * Neither the name of Robert Hafner nor the names of his |
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| 21 | * contributors may be used to endorse or promote products derived |
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| 22 | * from this software without specific prior written permission. |
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| 23 | * |
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 25 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 26 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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| 27 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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| 28 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 29 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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| 30 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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| 31 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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| 32 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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| 34 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 35 | * POSSIBILITY OF SUCH DAMAGE. |
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| 36 | * |
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| 37 | * @package JShrink |
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| 38 | * @author Robert Hafner <tedivm@tedivm.com> |
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| 39 | * @copyright 2009-2012 Robert Hafner <tedivm@tedivm.com> |
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| 40 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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| 41 | * @link https://github.com/tedivm/JShrink |
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| 42 | * @version Release: 0.5.1 |
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| 43 | */ |
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| 44 | |
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| 45 | |
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| 46 | /** |
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| 47 | * JShrink_Minifier |
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| 48 | * |
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| 49 | * Usage - JShrink_Minifier::minify($js); |
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| 50 | * Usage - JShrink_Minifier::minify($js, $options); |
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| 51 | * Usage - JShrink_Minifier::minify($js, array('flaggedComments' => false)); |
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| 52 | * |
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| 53 | * @package JShrink |
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| 54 | * @author Robert Hafner <tedivm@tedivm.com> |
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| 55 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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| 56 | */ |
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| 57 | class JShrink_Minifier |
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| 58 | { |
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| 59 | /** |
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| 60 | * The input javascript to be minified. |
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| 61 | * |
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| 62 | * @var string |
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| 63 | */ |
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| 64 | protected $input; |
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| 65 | |
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| 66 | /** |
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| 67 | * The location of the character (in the input string) that is next to be |
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| 68 | * processed. |
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| 69 | * |
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| 70 | * @var int |
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| 71 | */ |
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| 72 | protected $index = 0; |
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| 73 | |
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| 74 | /** |
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| 75 | * The first of the characters currently being looked at. |
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| 76 | * |
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| 77 | * @var string |
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| 78 | */ |
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| 79 | protected $a = ''; |
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| 80 | |
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| 81 | |
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| 82 | /** |
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| 83 | * The next character being looked at (after a); |
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| 84 | * |
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| 85 | * @var string |
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| 86 | */ |
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| 87 | protected $b = ''; |
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| 88 | |
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| 89 | /** |
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| 90 | * This character is only active when certain look ahead actions take place. |
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| 91 | * |
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| 92 | * @var string |
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| 93 | */ |
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| 94 | protected $c; |
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| 95 | |
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| 96 | /** |
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| 97 | * Contains the options for the current minification process. |
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| 98 | * |
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| 99 | * @var array |
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| 100 | */ |
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| 101 | protected $options; |
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| 102 | |
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| 103 | /** |
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| 104 | * Contains the default options for minification. This array is merged with |
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| 105 | * the one passed in by the user to create the request specific set of |
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| 106 | * options (stored in the $options attribute). |
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| 107 | * |
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| 108 | * @var array |
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| 109 | */ |
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| 110 | static protected $defaultOptions = array('flaggedComments' => true); |
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| 111 | |
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| 112 | /** |
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| 113 | * Contains a copy of the JShrink object used to run minification. This is |
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| 114 | * only used internally, and is only stored for performance reasons. There |
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| 115 | * is no internal data shared between minification requests. |
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| 116 | */ |
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| 117 | static protected $jshrink; |
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| 118 | |
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| 119 | /** |
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| 120 | * Minifier::minify takes a string containing javascript and removes |
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| 121 | * unneeded characters in order to shrink the code without altering it's |
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| 122 | * functionality. |
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| 123 | */ |
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| 124 | static public function minify($js, $options = array()) |
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| 125 | { |
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| 126 | try{ |
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| 127 | ob_start(); |
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| 128 | $currentOptions = array_merge(self::$defaultOptions, $options); |
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| 129 | |
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| 130 | if(!isset(self::$jshrink)) |
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| 131 | self::$jshrink = new JShrink_Minifier(); |
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| 132 | |
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| 133 | self::$jshrink->breakdownScript($js, $currentOptions); |
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| 134 | return ob_get_clean(); |
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| 135 | |
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| 136 | }catch(Exception $e){ |
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| 137 | if(isset(self::$jshrink)) |
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| 138 | self::$jshrink->clean(); |
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| 139 | |
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| 140 | ob_end_clean(); |
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| 141 | throw $e; |
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| 142 | } |
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| 143 | } |
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| 144 | |
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| 145 | /** |
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| 146 | * Processes a javascript string and outputs only the required characters, |
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| 147 | * stripping out all unneeded characters. |
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| 148 | * |
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| 149 | * @param string $js The raw javascript to be minified |
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| 150 | * @param array $currentOptions Various runtime options in an associative array |
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| 151 | */ |
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| 152 | protected function breakdownScript($js, $currentOptions) |
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| 153 | { |
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| 154 | // reset work attributes in case this isn't the first run. |
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| 155 | $this->clean(); |
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| 156 | |
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| 157 | $this->options = $currentOptions; |
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| 158 | |
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| 159 | $js = str_replace("\r\n", "\n", $js); |
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| 160 | $this->input = str_replace("\r", "\n", $js); |
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| 161 | |
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| 162 | |
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| 163 | $this->a = $this->getReal(); |
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| 164 | |
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| 165 | // the only time the length can be higher than 1 is if a conditional |
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| 166 | // comment needs to be displayed and the only time that can happen for |
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| 167 | // $a is on the very first run |
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| 168 | while(strlen($this->a) > 1) |
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| 169 | { |
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| 170 | echo $this->a; |
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| 171 | $this->a = $this->getReal(); |
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| 172 | } |
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| 173 | |
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| 174 | $this->b = $this->getReal(); |
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| 175 | |
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| 176 | while($this->a !== false && !is_null($this->a) && $this->a !== '') |
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| 177 | { |
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| 178 | |
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| 179 | // now we give $b the same check for conditional comments we gave $a |
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| 180 | // before we began looping |
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| 181 | if(strlen($this->b) > 1) |
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| 182 | { |
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| 183 | echo $this->a . $this->b; |
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| 184 | $this->a = $this->getReal(); |
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| 185 | $this->b = $this->getReal(); |
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| 186 | continue; |
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| 187 | } |
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| 188 | |
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| 189 | switch($this->a) |
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| 190 | { |
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| 191 | // new lines |
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| 192 | case "\n": |
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| 193 | // if the next line is something that can't stand alone |
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| 194 | // preserve the newline |
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| 195 | if(strpos('(-+{[@', $this->b) !== false) |
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| 196 | { |
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| 197 | echo $this->a; |
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| 198 | $this->saveString(); |
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| 199 | break; |
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| 200 | } |
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| 201 | |
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| 202 | // if its a space we move down to the string test below |
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| 203 | if($this->b === ' ') |
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| 204 | break; |
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| 205 | |
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| 206 | // otherwise we treat the newline like a space |
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| 207 | |
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| 208 | case ' ': |
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| 209 | if(self::isAlphaNumeric($this->b)) |
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| 210 | echo $this->a; |
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| 211 | |
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| 212 | $this->saveString(); |
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| 213 | break; |
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| 214 | |
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| 215 | default: |
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| 216 | switch($this->b) |
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| 217 | { |
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| 218 | case "\n": |
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| 219 | if(strpos('}])+-"\'', $this->a) !== false) |
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| 220 | { |
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| 221 | echo $this->a; |
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| 222 | $this->saveString(); |
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| 223 | break; |
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| 224 | }else{ |
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| 225 | if(self::isAlphaNumeric($this->a)) |
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| 226 | { |
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| 227 | echo $this->a; |
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| 228 | $this->saveString(); |
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| 229 | } |
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| 230 | } |
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| 231 | break; |
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| 232 | |
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| 233 | case ' ': |
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| 234 | if(!self::isAlphaNumeric($this->a)) |
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| 235 | break; |
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| 236 | |
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| 237 | default: |
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| 238 | // check for some regex that breaks stuff |
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| 239 | if($this->a == '/' && ($this->b == '\'' || $this->b == '"')) |
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| 240 | { |
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| 241 | $this->saveRegex(); |
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| 242 | continue; |
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| 243 | } |
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| 244 | |
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| 245 | echo $this->a; |
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| 246 | $this->saveString(); |
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| 247 | break; |
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| 248 | } |
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| 249 | } |
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| 250 | |
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| 251 | // do reg check of doom |
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| 252 | $this->b = $this->getReal(); |
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| 253 | |
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| 254 | if(($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false)) |
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| 255 | $this->saveRegex(); |
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| 256 | } |
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| 257 | $this->clean(); |
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| 258 | } |
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| 259 | |
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| 260 | /** |
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| 261 | * Returns the next string for processing based off of the current index. |
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| 262 | * |
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| 263 | * @return string |
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| 264 | */ |
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| 265 | protected function getChar() |
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| 266 | { |
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| 267 | if(isset($this->c)) |
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| 268 | { |
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| 269 | $char = $this->c; |
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| 270 | unset($this->c); |
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| 271 | }else{ |
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| 272 | $tchar = substr($this->input, $this->index, 1); |
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| 273 | if(isset($tchar) && $tchar !== false) |
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| 274 | { |
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| 275 | $char = $tchar; |
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| 276 | $this->index++; |
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| 277 | }else{ |
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| 278 | return false; |
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| 279 | } |
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| 280 | } |
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| 281 | |
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| 282 | if($char !== "\n" && ord($char) < 32) |
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| 283 | return ' '; |
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| 284 | |
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| 285 | return $char; |
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| 286 | } |
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| 287 | |
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| 288 | /** |
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| 289 | * This function gets the next "real" character. It is essentially a wrapper |
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| 290 | * around the getChar function that skips comments. This has significant |
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| 291 | * performance benefits as the skipping is done using native functions (ie, |
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| 292 | * c code) rather than in script php. |
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| 293 | * |
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| 294 | * @return string Next 'real' character to be processed. |
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| 295 | */ |
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| 296 | protected function getReal() |
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| 297 | { |
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| 298 | $startIndex = $this->index; |
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| 299 | $char = $this->getChar(); |
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| 300 | |
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| 301 | if($char == '/') |
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| 302 | { |
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| 303 | $this->c = $this->getChar(); |
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| 304 | |
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| 305 | if($this->c == '/') |
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| 306 | { |
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| 307 | $thirdCommentString = substr($this->input, $this->index, 1); |
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| 308 | |
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| 309 | // kill rest of line |
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| 310 | $char = $this->getNext("\n"); |
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| 311 | |
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| 312 | if($thirdCommentString == '@') |
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| 313 | { |
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| 314 | $endPoint = ($this->index) - $startIndex; |
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| 315 | unset($this->c); |
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| 316 | $char = "\n" . substr($this->input, $startIndex, $endPoint); |
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| 317 | }else{ |
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| 318 | $char = $this->getChar(); |
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| 319 | $char = $this->getChar(); |
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| 320 | } |
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| 321 | |
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| 322 | }elseif($this->c == '*'){ |
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| 323 | |
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| 324 | $this->getChar(); // current C |
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| 325 | $thirdCommentString = $this->getChar(); |
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| 326 | |
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| 327 | if($thirdCommentString == '@') |
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| 328 | { |
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| 329 | // conditional comment |
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| 330 | |
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| 331 | // we're gonna back up a bit and and send the comment back, |
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| 332 | // where the first char will be echoed and the rest will be |
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| 333 | // treated like a string |
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| 334 | $this->index = $this->index-2; |
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| 335 | return '/'; |
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| 336 | |
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| 337 | }elseif($this->getNext('*/')){ |
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| 338 | // kill everything up to the next */ |
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| 339 | |
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| 340 | $this->getChar(); // get * |
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| 341 | $this->getChar(); // get / |
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| 342 | |
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| 343 | $char = $this->getChar(); // get next real character |
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| 344 | |
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| 345 | // if YUI-style comments are enabled we reinsert it into the stream |
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| 346 | if($this->options['flaggedComments'] && $thirdCommentString == '!') |
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| 347 | { |
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| 348 | $endPoint = ($this->index - 1) - $startIndex; |
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| 349 | echo "\n" . substr($this->input, $startIndex, $endPoint) . "\n"; |
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| 350 | } |
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| 351 | |
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| 352 | }else{ |
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| 353 | $char = false; |
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| 354 | } |
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| 355 | |
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| 356 | if($char === false) |
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| 357 | throw new RuntimeException('Stray comment. ' . $this->index); |
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| 358 | |
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| 359 | // if we're here c is part of the comment and therefore tossed |
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| 360 | if(isset($this->c)) |
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| 361 | unset($this->c); |
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| 362 | } |
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| 363 | } |
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| 364 | return $char; |
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| 365 | } |
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| 366 | |
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| 367 | /** |
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| 368 | * Pushes the index ahead to the next instance of the supplied string. If it |
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| 369 | * is found the first character of the string is returned. |
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| 370 | * |
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| 371 | * @return string|false Returns the first character of the string or false. |
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| 372 | */ |
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| 373 | protected function getNext($string) |
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| 374 | { |
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| 375 | $pos = strpos($this->input, $string, $this->index); |
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| 376 | |
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| 377 | if($pos === false) |
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| 378 | return false; |
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| 379 | |
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| 380 | $this->index = $pos; |
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| 381 | return substr($this->input, $this->index, 1); |
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| 382 | } |
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| 383 | |
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| 384 | /** |
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| 385 | * When a javascript string is detected this function crawls for the end of |
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| 386 | * it and saves the whole string. |
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| 387 | * |
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| 388 | */ |
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| 389 | protected function saveString() |
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| 390 | { |
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| 391 | $this->a = $this->b; |
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| 392 | if($this->a == "'" || $this->a == '"') // is the character a quote |
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| 393 | { |
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| 394 | // save literal string |
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| 395 | $stringType = $this->a; |
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| 396 | |
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| 397 | while(1) |
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| 398 | { |
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| 399 | echo $this->a; |
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| 400 | $this->a = $this->getChar(); |
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| 401 | |
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| 402 | switch($this->a) |
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| 403 | { |
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| 404 | case $stringType: |
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| 405 | break 2; |
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| 406 | |
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| 407 | case "\n": |
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| 408 | throw new RuntimeException('Unclosed string. ' . $this->index); |
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| 409 | break; |
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| 410 | |
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| 411 | case '\\': |
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| 412 | echo $this->a; |
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| 413 | $this->a = $this->getChar(); |
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| 414 | } |
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| 415 | } |
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| 416 | } |
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| 417 | } |
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| 418 | |
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| 419 | /** |
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| 420 | * When a regular expression is detected this funcion crawls for the end of |
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| 421 | * it and saves the whole regex. |
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| 422 | */ |
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| 423 | protected function saveRegex() |
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| 424 | { |
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| 425 | echo $this->a . $this->b; |
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| 426 | |
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| 427 | while(($this->a = $this->getChar()) !== false) |
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| 428 | { |
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| 429 | if($this->a == '/') |
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| 430 | break; |
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| 431 | |
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| 432 | if($this->a == '\\') |
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| 433 | { |
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| 434 | echo $this->a; |
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| 435 | $this->a = $this->getChar(); |
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| 436 | } |
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| 437 | |
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| 438 | if($this->a == "\n") |
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| 439 | throw new RuntimeException('Stray regex pattern. ' . $this->index); |
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| 440 | |
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| 441 | echo $this->a; |
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| 442 | } |
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| 443 | $this->b = $this->getReal(); |
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| 444 | } |
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| 445 | |
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| 446 | /** |
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| 447 | * Resets attributes that do not need to be stored between requests so that |
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| 448 | * the next request is ready to go. |
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| 449 | */ |
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| 450 | protected function clean() |
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| 451 | { |
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| 452 | unset($this->input); |
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| 453 | $this->index = 0; |
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| 454 | $this->a = $this->b = ''; |
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| 455 | unset($this->c); |
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| 456 | unset($this->options); |
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| 457 | } |
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| 458 | |
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| 459 | /** |
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| 460 | * Checks to see if a character is alphanumeric. |
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| 461 | * |
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| 462 | * @return bool |
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| 463 | */ |
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| 464 | static protected function isAlphaNumeric($char) |
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| 465 | { |
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| 466 | return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/'; |
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| 467 | } |
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| 468 | |
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| 469 | } |
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