Gentics Portal.Node PHP API
 All Classes Namespaces Functions Variables Pages
JSMin.php
1 <?php
2 /**
3  * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
4  *
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
8  * string as output.
9  *
10  * PHP 5 or higher is required.
11  *
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:
14  *
15  * --
16  * Copyright (c) 2002 Douglas Crockford (www.crockford.com)
17  *
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:
24  *
25  * The above copyright notice and this permission notice shall be included in all
26  * copies or substantial portions of the Software.
27  *
28  * The Software shall be used for Good, not Evil.
29  *
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
36  * SOFTWARE.
37  * --
38  *
39  * @package JSMin
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 https://github.com/rgrove/jsmin-php/
46  */
47 
48 class JSMin {
49  const ORD_LF = 10;
50  const ORD_SPACE = 32;
51  const ACTION_KEEP_A = 1;
52  const ACTION_DELETE_A = 2;
53  const ACTION_DELETE_A_B= 3;
54 
55  protected $a = '';
56  protected $b = '';
57  protected $input = '';
58  protected $inputIndex = 0;
59  protected $inputLength = 0;
60  protected $lookAhead = null;
61  protected $output = '';
62 
63  // -- Public Static Methods --------------------------------------------------
64 
65  /**
66  * Minify Javascript
67  *
68  * @uses __construct()
69  * @uses min()
70  * @param string $js Javascript to be minified
71  * @return string
72  */
73  public static function minify($js) {
74  $jsmin = new JSMin($js);
75  return $jsmin->min();
76  }
77 
78  // -- Public Instance Methods ------------------------------------------------
79 
80  /**
81  * Constructor
82  *
83  * @param string $input Javascript to be minified
84  */
85  public function __construct($input) {
86  $this->input = str_replace("\r\n", "\n", $input);
87  $this->inputLength = strlen($this->input);
88  }
89 
90  // -- Protected Instance Methods ---------------------------------------------
91 
92  /**
93  * Action -- do something! What to do is determined by the $command argument.
94  *
95  * action treats a string as a single character. Wow!
96  * action recognizes a regular expression if it is preceded by ( or , or =.
97  *
98  * @uses next()
99  * @uses get()
100  * @throws JSMinException If parser errors are found:
101  * - Unterminated string literal
102  * - Unterminated regular expression set in regex literal
103  * - Unterminated regular expression literal
104  * @param int $command One of class constants:
105  * ACTION_KEEP_A Output A. Copy B to A. Get the next B.
106  * ACTION_DELETE_A Copy B to A. Get the next B. (Delete A).
107  * ACTION_DELETE_A_B Get the next B. (Delete B).
108  */
109  protected function action($command) {
110  switch($command) {
111  case self::ACTION_KEEP_A:
112  $this->output .= $this->a;
113 
114  case self::ACTION_DELETE_A:
115  $this->a = $this->b;
116 
117  if ($this->a === "'" || $this->a === '"') {
118  for (;;) {
119  $this->output .= $this->a;
120  $this->a = $this->get();
121 
122  if ($this->a === $this->b) {
123  break;
124  }
125 
126  if (ord($this->a) <= self::ORD_LF) {
127  throw new JSMinException('Unterminated string literal.');
128  }
129 
130  if ($this->a === '\\') {
131  $this->output .= $this->a;
132  $this->a = $this->get();
133  }
134  }
135  }
136 
137  case self::ACTION_DELETE_A_B:
138  $this->b = $this->next();
139 
140  if ($this->b === '/' && (
141  $this->a === '(' || $this->a === ',' || $this->a === '=' ||
142  $this->a === ':' || $this->a === '[' || $this->a === '!' ||
143  $this->a === '&' || $this->a === '|' || $this->a === '?' ||
144  $this->a === '{' || $this->a === '}' || $this->a === ';' ||
145  $this->a === "\n" )) {
146 
147  $this->output .= $this->a . $this->b;
148 
149  for (;;) {
150  $this->a = $this->get();
151 
152  if ($this->a === '[') {
153  /*
154  inside a regex [...] set, which MAY contain a '/' itself. Example: mootools Form.Validator near line 460:
155  return Form.Validator.getValidator('IsEmpty').test(element) || (/^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]\.?){0,63}[a-z0-9!#$%&'*+/=?^_`{|}~-]@(?:(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)*[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\])$/i).test(element.get('value'));
156  */
157  for (;;) {
158  $this->output .= $this->a;
159  $this->a = $this->get();
160 
161  if ($this->a === ']') {
162  break;
163  } elseif ($this->a === '\\') {
164  $this->output .= $this->a;
165  $this->a = $this->get();
166  } elseif (ord($this->a) <= self::ORD_LF) {
167  throw new JSMinException('Unterminated regular expression set in regex literal.');
168  }
169  }
170  } elseif ($this->a === '/') {
171  break;
172  } elseif ($this->a === '\\') {
173  $this->output .= $this->a;
174  $this->a = $this->get();
175  } elseif (ord($this->a) <= self::ORD_LF) {
176  throw new JSMinException('Unterminated regular expression literal.');
177  }
178 
179  $this->output .= $this->a;
180  }
181 
182  $this->b = $this->next();
183  }
184  }
185  }
186 
187  /**
188  * Get next char. Convert ctrl char to space.
189  *
190  * @return string|null
191  */
192  protected function get() {
193  $c = $this->lookAhead;
194  $this->lookAhead = null;
195 
196  if ($c === null) {
197  if ($this->inputIndex < $this->inputLength) {
198  $c = substr($this->input, $this->inputIndex, 1);
199  $this->inputIndex += 1;
200  } else {
201  $c = null;
202  }
203  }
204 
205  if ($c === "\r") {
206  return "\n";
207  }
208 
209  if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
210  return $c;
211  }
212 
213  return ' ';
214  }
215 
216  /**
217  * Is $c a letter, digit, underscore, dollar sign, or non-ASCII character.
218  *
219  * @return bool
220  */
221  protected function isAlphaNum($c) {
222  return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
223  }
224 
225  /**
226  * Perform minification, return result
227  *
228  * @uses action()
229  * @uses isAlphaNum()
230  * @return string
231  */
232  protected function min() {
233  $this->a = "\n";
234  $this->action(self::ACTION_DELETE_A_B);
235 
236  while ($this->a !== null) {
237  switch ($this->a) {
238  case ' ':
239  if ($this->isAlphaNum($this->b)) {
240  $this->action(self::ACTION_KEEP_A);
241  } else {
242  $this->action(self::ACTION_DELETE_A);
243  }
244  break;
245 
246  case "\n":
247  switch ($this->b) {
248  case '{':
249  case '[':
250  case '(':
251  case '+':
252  case '-':
253  $this->action(self::ACTION_KEEP_A);
254  break;
255 
256  case ' ':
257  $this->action(self::ACTION_DELETE_A_B);
258  break;
259 
260  default:
261  if ($this->isAlphaNum($this->b)) {
262  $this->action(self::ACTION_KEEP_A);
263  }
264  else {
265  $this->action(self::ACTION_DELETE_A);
266  }
267  }
268  break;
269 
270  default:
271  switch ($this->b) {
272  case ' ':
273  if ($this->isAlphaNum($this->a)) {
274  $this->action(self::ACTION_KEEP_A);
275  break;
276  }
277 
278  $this->action(self::ACTION_DELETE_A_B);
279  break;
280 
281  case "\n":
282  switch ($this->a) {
283  case '}':
284  case ']':
285  case ')':
286  case '+':
287  case '-':
288  case '"':
289  case "'":
290  $this->action(self::ACTION_KEEP_A);
291  break;
292 
293  default:
294  if ($this->isAlphaNum($this->a)) {
295  $this->action(self::ACTION_KEEP_A);
296  }
297  else {
298  $this->action(self::ACTION_DELETE_A_B);
299  }
300  }
301  break;
302 
303  default:
304  $this->action(self::ACTION_KEEP_A);
305  break;
306  }
307  }
308  }
309 
310  return $this->output;
311  }
312 
313  /**
314  * Get the next character, skipping over comments. peek() is used to see
315  * if a '/' is followed by a '/' or '*'.
316  *
317  * @uses get()
318  * @uses peek()
319  * @throws JSMinException On unterminated comment.
320  * @return string
321  */
322  protected function next() {
323  $c = $this->get();
324 
325  if ($c === '/') {
326  switch($this->peek()) {
327  case '/':
328  for (;;) {
329  $c = $this->get();
330 
331  if (ord($c) <= self::ORD_LF) {
332  return $c;
333  }
334  }
335 
336  case '*':
337  $this->get();
338 
339  for (;;) {
340  switch($this->get()) {
341  case '*':
342  if ($this->peek() === '/') {
343  $this->get();
344  return ' ';
345  }
346  break;
347 
348  case null:
349  throw new JSMinException('Unterminated comment.');
350  }
351  }
352 
353  default:
354  return $c;
355  }
356  }
357 
358  return $c;
359  }
360 
361  /**
362  * Get next char. If is ctrl character, translate to a space or newline.
363  *
364  * @uses get()
365  * @return string|null
366  */
367  protected function peek() {
368  $this->lookAhead = $this->get();
369  return $this->lookAhead;
370  }
371 }
372 
373 // -- Exceptions ---------------------------------------------------------------
374 class JSMinException extends Exception {}