3 * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
5 * This is pretty much a direct port of jsmin.c to PHP with just a few
6 * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
7 * outputs to stdout, this library accepts a string as input and returns another
10 * PHP 5 or higher is required.
12 * Permission is hereby granted to use this version of the library under the
13 * same terms as jsmin.c, which has the following license:
16 * Copyright (c) 2002 Douglas Crockford (www.crockford.com)
18 * Permission is hereby granted, free of charge, to any person obtaining a copy of
19 * this software and associated documentation files (the "Software"), to deal in
20 * the Software without restriction, including without limitation the rights to
21 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
22 * of the Software, and to permit persons to whom the Software is furnished to do
23 * so, subject to the following conditions:
25 * The above copyright notice and this permission notice shall be included in all
26 * copies or substantial portions of the Software.
28 * The Software shall be used for Good, not Evil.
30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
31 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
32 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
33 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
34 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
35 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
40 * @author Ryan Grove <ryan@wonko.com>
41 * @copyright 2002 Douglas Crockford <douglas@crockford.com> (jsmin.c)
42 * @copyright 2008 Ryan Grove <ryan@wonko.com> (PHP port)
43 * @license http://opensource.org/licenses/mit-license.php MIT License
44 * @version 1.1.1 (2008-03-02)
45 * @link http://code.google.com/p/jsmin-php/
54 protected $input = '';
55 protected $inputIndex = 0;
56 protected $inputLength = 0;
57 protected $lookAhead = null;
58 protected $output = '';
60 // -- Public Static Methods --------------------------------------------------
62 public static function minify($js) {
63 $jsmin = new JSMin($js);
67 // -- Public Instance Methods ------------------------------------------------
69 public function __construct($input) {
70 $this->input = str_replace("\r\n", "\n", $input);
71 $this->inputLength = strlen($this->input);
74 // -- Protected Instance Methods ---------------------------------------------
76 protected function action($d) {
79 $this->output .= $this->a;
84 if ($this->a === "'" || $this->a === '"') {
86 $this->output .= $this->a;
87 $this->a = $this->get();
89 if ($this->a === $this->b) {
93 if (ord($this->a) <= self::ORD_LF) {
94 throw new JSMinException('Unterminated string literal.');
97 if ($this->a === '\\') {
98 $this->output .= $this->a;
99 $this->a = $this->get();
105 $this->b = $this->next();
107 if ($this->b === '/' && (
108 $this->a === '(' || $this->a === ',' || $this->a === '=' ||
109 $this->a === ':' || $this->a === '[' || $this->a === '!' ||
110 $this->a === '&' || $this->a === '|' || $this->a === '?')) {
112 $this->output .= $this->a . $this->b;
115 $this->a = $this->get();
117 if ($this->a === '/') {
119 } elseif ($this->a === '\\') {
120 $this->output .= $this->a;
121 $this->a = $this->get();
122 } elseif (ord($this->a) <= self::ORD_LF) {
123 throw new JSMinException('Unterminated regular expression '.
127 $this->output .= $this->a;
130 $this->b = $this->next();
135 protected function get() {
136 $c = $this->lookAhead;
137 $this->lookAhead = null;
140 if ($this->inputIndex < $this->inputLength) {
141 $c = $this->input[$this->inputIndex];
142 $this->inputIndex += 1;
152 if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
159 protected function isAlphaNum($c) {
160 return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
163 protected function min() {
167 while ($this->a !== null) {
170 if ($this->isAlphaNum($this->b)) {
192 if ($this->isAlphaNum($this->b)) {
204 if ($this->isAlphaNum($this->a)) {
225 if ($this->isAlphaNum($this->a)) {
241 return $this->output;
244 protected function next() {
248 switch($this->peek()) {
253 if (ord($c) <= self::ORD_LF) {
262 switch($this->get()) {
264 if ($this->peek() === '/') {
271 throw new JSMinException('Unterminated comment.');
283 protected function peek() {
284 $this->lookAhead = $this->get();
285 return $this->lookAhead;
289 // -- Exceptions ---------------------------------------------------------------
290 class JSMinException extends Exception {}