MDL-65744 lib: Update minify minify lib
[moodle.git] / lib / minify / matthiasmullie-minify / src / JS.php
CommitLineData
4cb24aa9 1<?php
a62074ba
MM
2/**
3 * JavaScript minifier
4 *
5 * Please report bugs on https://github.com/matthiasmullie/minify/issues
6 *
7 * @author Matthias Mullie <minify@mullie.eu>
8 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
9 * @license MIT License
10 */
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11namespace MatthiasMullie\Minify;
12
13/**
a62074ba 14 * JavaScript Minifier Class
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15 *
16 * Please report bugs on https://github.com/matthiasmullie/minify/issues
17 *
a62074ba 18 * @package Minify
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19 * @author Matthias Mullie <minify@mullie.eu>
20 * @author Tijs Verkoyen <minify@verkoyen.eu>
c7f9a59f 21 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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22 * @license MIT License
23 */
24class JS extends Minify
25{
26 /**
27 * Var-matching regex based on http://stackoverflow.com/a/9337047/802993.
28 *
29 * Note that regular expressions using that bit must have the PCRE_UTF8
30 * pattern modifier (/u) set.
31 *
32 * @var string
33 */
34 const REGEX_VARIABLE = 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35
36 /**
37 * Full list of JavaScript reserved words.
38 * Will be loaded from /data/js/keywords_reserved.txt.
39 *
40 * @see https://mathiasbynens.be/notes/reserved-keywords
41 *
42 * @var string[]
43 */
44 protected $keywordsReserved = array();
45
46 /**
47 * List of JavaScript reserved words that accept a <variable, value, ...>
48 * after them. Some end of lines are not the end of a statement, like with
49 * these keywords.
50 *
51 * E.g.: we shouldn't insert a ; after this else
52 * else
53 * console.log('this is quite fine')
54 *
55 * Will be loaded from /data/js/keywords_before.txt
56 *
57 * @var string[]
58 */
59 protected $keywordsBefore = array();
60
61 /**
62 * List of JavaScript reserved words that accept a <variable, value, ...>
63 * before them. Some end of lines are not the end of a statement, like when
64 * continued by one of these keywords on the newline.
65 *
66 * E.g.: we shouldn't insert a ; before this instanceof
67 * variable
68 * instanceof String
69 *
70 * Will be loaded from /data/js/keywords_after.txt
71 *
72 * @var string[]
73 */
74 protected $keywordsAfter = array();
75
76 /**
77 * List of all JavaScript operators.
78 *
79 * Will be loaded from /data/js/operators.txt
80 *
81 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
82 *
83 * @var string[]
84 */
85 protected $operators = array();
86
87 /**
88 * List of JavaScript operators that accept a <variable, value, ...> after
89 * them. Some end of lines are not the end of a statement, like with these
90 * operators.
91 *
c7f9a59f 92 * Note: Most operators are fine, we've only removed ++ and --.
4cb24aa9
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93 * ++ & -- have to be joined with the value they're in-/decrementing.
94 *
95 * Will be loaded from /data/js/operators_before.txt
96 *
97 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
98 *
99 * @var string[]
100 */
101 protected $operatorsBefore = array();
102
103 /**
104 * List of JavaScript operators that accept a <variable, value, ...> before
105 * them. Some end of lines are not the end of a statement, like when
106 * continued by one of these operators on the newline.
107 *
c7f9a59f
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108 * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~.
109 * There can't be a newline separating ! or ~ and whatever it is negating.
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110 * ++ & -- have to be joined with the value they're in-/decrementing.
111 * ) & ] are "special" in that they have lots or usecases. () for example
112 * is used for function calls, for grouping, in if () and for (), ...
113 *
114 * Will be loaded from /data/js/operators_after.txt
115 *
116 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
117 *
118 * @var string[]
119 */
120 protected $operatorsAfter = array();
121
122 /**
123 * {@inheritdoc}
124 */
125 public function __construct()
126 {
127 call_user_func_array(array('parent', '__construct'), func_get_args());
128
129 $dataDir = __DIR__.'/../data/js/';
130 $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
131 $this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options);
132 $this->keywordsBefore = file($dataDir.'keywords_before.txt', $options);
133 $this->keywordsAfter = file($dataDir.'keywords_after.txt', $options);
134 $this->operators = file($dataDir.'operators.txt', $options);
135 $this->operatorsBefore = file($dataDir.'operators_before.txt', $options);
136 $this->operatorsAfter = file($dataDir.'operators_after.txt', $options);
137 }
138
139 /**
140 * Minify the data.
141 * Perform JS optimizations.
142 *
c7f9a59f 143 * @param string[optional] $path Path to write the data to
4cb24aa9 144 *
c7f9a59f 145 * @return string The minified data
4cb24aa9
DP
146 */
147 public function execute($path = null)
148 {
149 $content = '';
150
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151 /*
152 * Let's first take out strings, comments and regular expressions.
153 * All of these can contain JS code-like characters, and we should make
154 * sure any further magic ignores anything inside of these.
155 *
156 * Consider this example, where we should not strip any whitespace:
157 * var str = "a test";
158 *
159 * Comments will be removed altogether, strings and regular expressions
160 * will be replaced by placeholder text, which we'll restore later.
161 */
162 $this->extractStrings('\'"`');
163 $this->stripComments();
164 $this->extractRegex();
4cb24aa9 165
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166 // loop files
167 foreach ($this->data as $source => $js) {
168 // take out strings, comments & regex (for which we've registered
169 // the regexes just a few lines earlier)
170 $js = $this->replace($js);
171
172 $js = $this->propertyNotation($js);
173 $js = $this->shortenBools($js);
174 $js = $this->stripWhitespace($js);
175
176 // combine js: separating the scripts by a ;
177 $content .= $js.";";
178 }
179
180 // clean up leftover `;`s from the combination of multiple scripts
181 $content = ltrim($content, ';');
182 $content = (string) substr($content, 0, -1);
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183
184 /*
185 * Earlier, we extracted strings & regular expressions and replaced them
186 * with placeholder text. This will restore them.
187 */
188 $content = $this->restoreExtractedData($content);
189
190 return $content;
191 }
192
193 /**
194 * Strip comments from source code.
195 */
196 protected function stripComments()
197 {
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198 // PHP only supports $this inside anonymous functions since 5.4
199 $minifier = $this;
200 $callback = function ($match) use ($minifier) {
201 $count = count($minifier->extracted);
202 $placeholder = '/*'.$count.'*/';
203 $minifier->extracted[$placeholder] = $match[0];
4cb24aa9 204
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205 return $placeholder;
206 };
4cb24aa9 207 // multi-line comments
a62074ba 208 $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);
4cb24aa9 209 $this->registerPattern('/\/\*.*?\*\//s', '');
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210
211 // single-line comments
212 $this->registerPattern('/\/\/.*$/m', '');
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213 }
214
215 /**
216 * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
217 *
218 * The content inside the regex can contain characters that may be confused
219 * for JS code: e.g. it could contain whitespace it needs to match & we
220 * don't want to strip whitespace in there.
221 *
222 * The regex can be pretty simple: we don't have to care about comments,
223 * (which also use slashes) because stripComments() will have stripped those
224 * already.
225 *
226 * This method will replace all string content with simple REGEX#
227 * placeholder text, so we've rid all regular expressions from characters
228 * that may be misinterpreted. Original regex content will be saved in
229 * $this->extracted and after doing all other minifying, we can restore the
230 * original content via restoreRegex()
231 */
232 protected function extractRegex()
233 {
234 // PHP only supports $this inside anonymous functions since 5.4
235 $minifier = $this;
236 $callback = function ($match) use ($minifier) {
237 $count = count($minifier->extracted);
c7f9a59f 238 $placeholder = '"'.$count.'"';
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239 $minifier->extracted[$placeholder] = $match[0];
240
241 return $placeholder;
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242 };
243
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244 // match all chars except `/` and `\`
245 // `\` is allowed though, along with whatever char follows (which is the
246 // one being escaped)
247 // this should allow all chars, except for an unescaped `/` (= the one
248 // closing the regex)
249 // then also ignore bare `/` inside `[]`, where they don't need to be
250 // escaped: anything inside `[]` can be ignored safely
251 $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*';
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252
253 // a regular expression can only be followed by a few operators or some
254 // of the RegExp methods (a `\` followed by a variable or value is
255 // likely part of a division, not a regex)
c7f9a59f 256 $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof');
a62074ba 257 $before = '([=:,;\+\-\*\/\}\(\{\[&\|!]|^|'.implode('|', $keywords).')\s*';
c7f9a59f 258 $propertiesAndMethods = array(
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259 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
260 'constructor',
261 'flags',
262 'global',
263 'ignoreCase',
264 'multiline',
265 'source',
266 'sticky',
267 'unicode',
268 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
269 'compile(',
270 'exec(',
271 'test(',
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272 'toSource(',
273 'toString(',
274 );
275 $delimiters = array_fill(0, count($propertiesAndMethods), '/');
276 $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
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277 $after = '(?=\s*([\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))';
278 $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
279
280 // regular expressions following a `)` are rather annoying to detect...
281 // quite often, `/` after `)` is a division operator & if it happens to
282 // be followed by another one (or a comment), it is likely to be
283 // confused for a regular expression
284 // however, it's perfectly possible for a regex to follow a `)`: after
285 // a single-line `if()`, `while()`, ... statement, for example
286 // since, when they occur like that, they're always the start of a
287 // statement, there's only a limited amount of ways they can be useful:
288 // by calling the regex methods directly
289 // if a regex following `)` is not followed by `.<property or method>`,
290 // it's quite likely not a regex
291 $before = '\)\s*';
292 $after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))';
293 $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
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294
295 // 1 more edge case: a regex can be followed by a lot more operators or
296 // keywords if there's a newline (ASI) in between, where the operator
297 // actually starts a new statement
298 // (https://github.com/matthiasmullie/minify/issues/56)
299 $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
300 $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
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301 $after = '(?=\s*\n\s*('.implode('|', $operators).'))';
302 $this->registerPattern('/'.$pattern.$after.'/', $callback);
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303 }
304
305 /**
306 * Strip whitespace.
307 *
308 * We won't strip *all* whitespace, but as much as possible. The thing that
309 * we'll preserve are newlines we're unsure about.
310 * JavaScript doesn't require statements to be terminated with a semicolon.
311 * It will automatically fix missing semicolons with ASI (automatic semi-
312 * colon insertion) at the end of line causing errors (without semicolon.)
313 *
314 * Because it's sometimes hard to tell if a newline is part of a statement
315 * that should be terminated or not, we'll just leave some of them alone.
316 *
c7f9a59f 317 * @param string $content The content to strip the whitespace for
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318 *
319 * @return string
320 */
321 protected function stripWhitespace($content)
322 {
323 // uniform line endings, make them all line feed
324 $content = str_replace(array("\r\n", "\r"), "\n", $content);
325
326 // collapse all non-line feed whitespace into a single space
327 $content = preg_replace('/[^\S\n]+/', ' ', $content);
328
329 // strip leading & trailing whitespace
330 $content = str_replace(array(" \n", "\n "), "\n", $content);
331
332 // collapse consecutive line feeds into just 1
333 $content = preg_replace('/\n+/', "\n", $content);
334
335 $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
336 $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
337 $operators = $this->getOperatorsForRegex($this->operators, '/');
338 $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
339 $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
340
341 // strip whitespace that ends in (or next line begin with) an operator
342 // that allows statements to be broken up over multiple lines
343 unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
344 $content = preg_replace(
345 array(
346 '/('.implode('|', $operatorsBefore).')\s+/',
347 '/\s+('.implode('|', $operatorsAfter).')/',
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348 ),
349 '\\1',
350 $content
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351 );
352
353 // make sure + and - can't be mistaken for, or joined into ++ and --
354 $content = preg_replace(
355 array(
356 '/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
357 '/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
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358 ),
359 '\\1',
360 $content
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361 );
362
363 // collapse whitespace around reserved words into single space
364 $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
365 $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
366
367 /*
368 * We didn't strip whitespace after a couple of operators because they
369 * could be used in different contexts and we can't be sure it's ok to
370 * strip the newlines. However, we can safely strip any non-line feed
371 * whitespace that follows them.
372 */
373 $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
374 $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
375 $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
376 $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
377
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378 /*
379 * Whitespace after `return` can be omitted in a few occasions
380 * (such as when followed by a string or regex)
381 * Same for whitespace in between `)` and `{`, or between `{` and some
382 * keywords.
383 */
384 $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
385 $content = preg_replace('/\)\s+\{/', '){', $content);
386 $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content);
387
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388 /*
389 * Get rid of double semicolons, except where they can be used like:
390 * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
391 * I'll safeguard these double semicolons inside for-loops by
392 * temporarily replacing them with an invalid condition: they won't have
393 * a double semicolon and will be easy to spot to restore afterwards.
394 */
395 $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
396 $content = preg_replace('/;+/', ';', $content);
397 $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
398
399 /*
400 * Next, we'll be removing all semicolons where ASI kicks in.
401 * for-loops however, can have an empty body (ending in only a
c7f9a59f 402 * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
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403 * Here, nothing happens during the loop; it's just used to keep
404 * increasing `i`. With that ; omitted, the next line would be expected
a62074ba 405 * to be the for-loop's body... Same goes for while loops.
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406 * I'm going to double that semicolon (if any) so after the next line,
407 * which strips semicolons here & there, we're still left with this one.
408 */
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409 $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);
410 $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
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411 /*
412 * Below will also keep `;` after a `do{}while();` along with `while();`
413 * While these could be stripped after do-while, detecting this
414 * distinction is cumbersome, so I'll play it safe and make sure `;`
415 * after any kind of `while` is kept.
416 */
417 $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
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418
419 /*
420 * We also can't strip empty else-statements. Even though they're
421 * useless and probably shouldn't be in the code in the first place, we
422 * shouldn't be stripping the `;` that follows it as it breaks the code.
423 * We can just remove those useless else-statements completely.
424 *
425 * @see https://github.com/matthiasmullie/minify/issues/91
426 */
427 $content = preg_replace('/else;/s', '', $content);
428
429 /*
430 * We also don't really want to terminate statements followed by closing
431 * curly braces (which we've ignored completely up until now) or end-of-
432 * script: ASI will kick in here & we're all about minifying.
433 * Semicolons at beginning of the file don't make any sense either.
434 */
435 $content = preg_replace('/;(\}|$)/s', '\\1', $content);
436 $content = ltrim($content, ';');
437
438 // get rid of remaining whitespace af beginning/end
439 return trim($content);
440 }
441
442 /**
443 * We'll strip whitespace around certain operators with regular expressions.
444 * This will prepare the given array by escaping all characters.
445 *
446 * @param string[] $operators
447 * @param string $delimiter
448 *
449 * @return string[]
450 */
451 protected function getOperatorsForRegex(array $operators, $delimiter = '/')
452 {
453 // escape operators for use in regex
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454 $delimiters = array_fill(0, count($operators), $delimiter);
455 $escaped = array_map('preg_quote', $operators, $delimiters);
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456
457 $operators = array_combine($operators, $escaped);
458
459 // ignore + & - for now, they'll get special treatment
460 unset($operators['+'], $operators['-']);
461
462 // dot can not just immediately follow a number; it can be confused for
463 // decimal point, or calling a method on it, e.g. 42 .toString()
464 $operators['.'] = '(?<![0-9]\s)\.';
465
466 // don't confuse = with other assignment shortcuts (e.g. +=)
c7f9a59f 467 $chars = preg_quote('+-*\=<>%&|', $delimiter);
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468 $operators['='] = '(?<!['.$chars.'])\=';
469
470 return $operators;
471 }
472
473 /**
474 * We'll strip whitespace around certain keywords with regular expressions.
475 * This will prepare the given array by escaping all characters.
476 *
477 * @param string[] $keywords
478 * @param string $delimiter
479 *
480 * @return string[]
481 */
482 protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
483 {
484 // escape keywords for use in regex
485 $delimiter = array_fill(0, count($keywords), $delimiter);
486 $escaped = array_map('preg_quote', $keywords, $delimiter);
487
488 // add word boundaries
489 array_walk($keywords, function ($value) {
490 return '\b'.$value.'\b';
491 });
492
493 $keywords = array_combine($keywords, $escaped);
494
495 return $keywords;
496 }
497
498 /**
499 * Replaces all occurrences of array['key'] by array.key.
500 *
501 * @param string $content
502 *
503 * @return string
504 */
505 protected function propertyNotation($content)
506 {
507 // PHP only supports $this inside anonymous functions since 5.4
508 $minifier = $this;
509 $keywords = $this->keywordsReserved;
510 $callback = function ($match) use ($minifier, $keywords) {
511 $property = trim($minifier->extracted[$match[1]], '\'"');
512
513 /*
514 * Check if the property is a reserved keyword. In this context (as
515 * property of an object literal/array) it shouldn't matter, but IE8
516 * freaks out with "Expected identifier".
517 */
518 if (in_array($property, $keywords)) {
519 return $match[0];
520 }
521
522 /*
523 * See if the property is in a variable-like format (e.g.
524 * array['key-here'] can't be replaced by array.key-here since '-'
525 * is not a valid character there.
526 */
527 if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
528 return $match[0];
529 }
530
531 return '.'.$property;
532 };
533
534 /*
535 * Figure out if previous character is a variable name (of the array
536 * we want to use property notation on) - this is to make sure
537 * standalone ['value'] arrays aren't confused for keys-of-an-array.
538 * We can (and only have to) check the last character, because PHP's
539 * regex implementation doesn't allow unfixed-length look-behind
540 * assertions.
541 */
542 preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
543 $previousChar = $previousChar[1];
544
545 /*
546 * Make sure word preceding the ['value'] is not a keyword, e.g.
547 * return['x']. Because -again- PHP's regex implementation doesn't allow
548 * unfixed-length look-behind assertions, I'm just going to do a lot of
549 * separate look-behind assertions, one for each keyword.
550 */
551 $keywords = $this->getKeywordsForRegex($keywords);
552 $keywords = '(?<!'.implode(')(?<!', $keywords).')';
553
554 return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
555 }
556
557 /**
558 * Replaces true & false by !0 and !1.
559 *
560 * @param string $content
561 *
562 * @return string
563 */
564 protected function shortenBools($content)
565 {
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566 /*
567 * 'true' or 'false' could be used as property names (which may be
568 * followed by whitespace) - we must not replace those!
569 * Since PHP doesn't allow variable-length (to account for the
570 * whitespace) lookbehind assertions, I need to capture the leading
571 * character and check if it's a `.`
572 */
573 $callback = function ($match) {
574 if (trim($match[1]) === '.') {
575 return $match[0];
576 }
577
578 return $match[1].($match[2] === 'true' ? '!0' : '!1');
579 };
580 $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
4cb24aa9 581
c7f9a59f 582 // for(;;) is exactly the same as while(true), but shorter :)
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583 $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
584
585 // now make sure we didn't turn any do ... while(true) into do ... for(;;)
586 preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
587
588 // go backward to make sure positional offsets aren't altered when $content changes
589 $dos = array_reverse($dos);
590 foreach ($dos as $do) {
591 $offsetDo = $do[0][1];
592
593 // find all `while` (now `for`) following `do`: one of those must be
594 // associated with the `do` and be turned back into `while`
595 preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
596 foreach ($whiles as $while) {
597 $offsetWhile = $while[0][1];
598
599 $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
600 $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
601 if ($open === $close) {
602 // only restore `while` if amount of `{` and `}` are the same;
603 // otherwise, that `for` isn't associated with this `do`
604 $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
605 break;
606 }
607 }
608 }
609
610 return $content;
611 }
612}