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<?php |
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/** |
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* JavaScript minifier |
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* |
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* Please report bugs on https://github.com/matthiasmullie/minify/issues |
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* |
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* @author Matthias Mullie <[email protected]> |
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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* @license MIT License |
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*/ |
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namespace MatthiasMullie\Minify; |
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|
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/** |
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* JavaScript Minifier Class |
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* |
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* Please report bugs on https://github.com/matthiasmullie/minify/issues |
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* |
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* @package Minify |
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* @author Matthias Mullie <[email protected]> |
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* @author Tijs Verkoyen <[email protected]> |
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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* @license MIT License |
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*/ |
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class JS extends Minify |
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{ |
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/** |
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* Var-matching regex based on http://stackoverflow.com/a/9337047/802993. |
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* |
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* Note that regular expressions using that bit must have the PCRE_UTF8 |
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* pattern modifier (/u) set. |
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* |
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* @var string |
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*/ |
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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 |
* |
| 92 |
* Note: Most operators are fine, we've only removed ++ and --. |
| 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 |
* |
| 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. |
| 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 |
* |
| 143 |
* @param string[optional] $path Path to write the data to |
| 144 |
* |
| 145 |
* @return string The minified data |
| 146 |
*/ |
| 147 |
public function execute($path = null) |
| 148 |
{ |
| 149 |
$content = ''; |
| 150 |
|
| 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 |
$this->extractRegex(); |
| 165 |
|
| 166 |
// loop files |
| 167 |
foreach ($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); |
| 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 |
{ |
| 198 |
// PHP only supports $this inside anonymous functions since 5.4 |
| 199 |
$minifier = $this; |
| 200 |
$callback = function ($match) use ($minifier) { |
| 201 |
if ( |
| 202 |
substr($match[1], 0, 1) === '!' || |
| 203 |
strpos($match[1], '@license') !== false || |
| 204 |
strpos($match[1], '@preserve') !== false |
| 205 |
) { |
| 206 |
// preserve multi-line comments that start with /*! |
| 207 |
// or contain @license or @preserve annotations |
| 208 |
$count = count($minifier->extracted); |
| 209 |
$placeholder = '/*'.$count.'*/'; |
| 210 |
$minifier->extracted[$placeholder] = $match[0]; |
| 211 |
|
| 212 |
return $placeholder; |
| 213 |
} |
| 214 |
|
| 215 |
return ''; |
| 216 |
}; |
| 217 |
|
| 218 |
// multi-line comments |
| 219 |
$this->registerPattern('/\n?\/\*(.*?)\*\/\n?/s', $callback); |
| 220 |
|
| 221 |
// single-line comments |
| 222 |
$this->registerPattern('/\/\/.*$/m', ''); |
| 223 |
} |
| 224 |
|
| 225 |
/** |
| 226 |
* JS can have /-delimited regular expressions, like: /ab+c/.match(string). |
| 227 |
* |
| 228 |
* The content inside the regex can contain characters that may be confused |
| 229 |
* for JS code: e.g. it could contain whitespace it needs to match & we |
| 230 |
* don't want to strip whitespace in there. |
| 231 |
* |
| 232 |
* The regex can be pretty simple: we don't have to care about comments, |
| 233 |
* (which also use slashes) because stripComments() will have stripped those |
| 234 |
* already. |
| 235 |
* |
| 236 |
* This method will replace all string content with simple REGEX# |
| 237 |
* placeholder text, so we've rid all regular expressions from characters |
| 238 |
* that may be misinterpreted. Original regex content will be saved in |
| 239 |
* $this->extracted and after doing all other minifying, we can restore the |
| 240 |
* original content via restoreRegex() |
| 241 |
*/ |
| 242 |
protected function extractRegex() |
| 243 |
{ |
| 244 |
// PHP only supports $this inside anonymous functions since 5.4 |
| 245 |
$minifier = $this; |
| 246 |
$callback = function ($match) use ($minifier) { |
| 247 |
$count = count($minifier->extracted); |
| 248 |
$placeholder = '"'.$count.'"'; |
| 249 |
$minifier->extracted[$placeholder] = $match[0]; |
| 250 |
|
| 251 |
return $placeholder; |
| 252 |
}; |
| 253 |
|
| 254 |
// match all chars except `/` and `\` |
| 255 |
// `\` is allowed though, along with whatever char follows (which is the |
| 256 |
// one being escaped) |
| 257 |
// this should allow all chars, except for an unescaped `/` (= the one |
| 258 |
// closing the regex) |
| 259 |
// then also ignore bare `/` inside `[]`, where they don't need to be |
| 260 |
// escaped: anything inside `[]` can be ignored safely |
| 261 |
$pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; |
| 262 |
|
| 263 |
// a regular expression can only be followed by a few operators or some |
| 264 |
// of the RegExp methods (a `\` followed by a variable or value is |
| 265 |
// likely part of a division, not a regex) |
| 266 |
$keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); |
| 267 |
$before = '(^|[=:,;\+\-\*\/\}\(\{\[&\|!]|'.implode('|', $keywords).')\s*'; |
| 268 |
$propertiesAndMethods = array( |
| 269 |
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 |
| 270 |
'constructor', |
| 271 |
'flags', |
| 272 |
'global', |
| 273 |
'ignoreCase', |
| 274 |
'multiline', |
| 275 |
'source', |
| 276 |
'sticky', |
| 277 |
'unicode', |
| 278 |
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 |
| 279 |
'compile(', |
| 280 |
'exec(', |
| 281 |
'test(', |
| 282 |
'toSource(', |
| 283 |
'toString(', |
| 284 |
); |
| 285 |
$delimiters = array_fill(0, count($propertiesAndMethods), '/'); |
| 286 |
$propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); |
| 287 |
$after = '(?=\s*([\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))'; |
| 288 |
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); |
| 289 |
|
| 290 |
// regular expressions following a `)` are rather annoying to detect... |
| 291 |
// quite often, `/` after `)` is a division operator & if it happens to |
| 292 |
// be followed by another one (or a comment), it is likely to be |
| 293 |
// confused for a regular expression |
| 294 |
// however, it's perfectly possible for a regex to follow a `)`: after |
| 295 |
// a single-line `if()`, `while()`, ... statement, for example |
| 296 |
// since, when they occur like that, they're always the start of a |
| 297 |
// statement, there's only a limited amount of ways they can be useful: |
| 298 |
// by calling the regex methods directly |
| 299 |
// if a regex following `)` is not followed by `.<property or method>`, |
| 300 |
// it's quite likely not a regex |
| 301 |
$before = '\)\s*'; |
| 302 |
$after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))'; |
| 303 |
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); |
| 304 |
|
| 305 |
// 1 more edge case: a regex can be followed by a lot more operators or |
| 306 |
// keywords if there's a newline (ASI) in between, where the operator |
| 307 |
// actually starts a new statement |
| 308 |
// (https://github.com/matthiasmullie/minify/issues/56) |
| 309 |
$operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
| 310 |
$operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); |
| 311 |
$after = '(?=\s*\n\s*('.implode('|', $operators).'))'; |
| 312 |
$this->registerPattern('/'.$pattern.$after.'/', $callback); |
| 313 |
} |
| 314 |
|
| 315 |
/** |
| 316 |
* Strip whitespace. |
| 317 |
* |
| 318 |
* We won't strip *all* whitespace, but as much as possible. The thing that |
| 319 |
* we'll preserve are newlines we're unsure about. |
| 320 |
* JavaScript doesn't require statements to be terminated with a semicolon. |
| 321 |
* It will automatically fix missing semicolons with ASI (automatic semi- |
| 322 |
* colon insertion) at the end of line causing errors (without semicolon.) |
| 323 |
* |
| 324 |
* Because it's sometimes hard to tell if a newline is part of a statement |
| 325 |
* that should be terminated or not, we'll just leave some of them alone. |
| 326 |
* |
| 327 |
* @param string $content The content to strip the whitespace for |
| 328 |
* |
| 329 |
* @return string |
| 330 |
*/ |
| 331 |
protected function stripWhitespace($content) |
| 332 |
{ |
| 333 |
// uniform line endings, make them all line feed |
| 334 |
$content = str_replace(array("\r\n", "\r"), "\n", $content); |
| 335 |
|
| 336 |
// collapse all non-line feed whitespace into a single space |
| 337 |
$content = preg_replace('/[^\S\n]+/', ' ', $content); |
| 338 |
|
| 339 |
// strip leading & trailing whitespace |
| 340 |
$content = str_replace(array(" \n", "\n "), "\n", $content); |
| 341 |
|
| 342 |
// collapse consecutive line feeds into just 1 |
| 343 |
$content = preg_replace('/\n+/', "\n", $content); |
| 344 |
|
| 345 |
$operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
| 346 |
$operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); |
| 347 |
$operators = $this->getOperatorsForRegex($this->operators, '/'); |
| 348 |
$keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); |
| 349 |
$keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); |
| 350 |
|
| 351 |
// strip whitespace that ends in (or next line begin with) an operator |
| 352 |
// that allows statements to be broken up over multiple lines |
| 353 |
unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); |
| 354 |
$content = preg_replace( |
| 355 |
array( |
| 356 |
'/('.implode('|', $operatorsBefore).')\s+/', |
| 357 |
'/\s+('.implode('|', $operatorsAfter).')/', |
| 358 |
), |
| 359 |
'\\1', |
| 360 |
$content |
| 361 |
); |
| 362 |
|
| 363 |
// make sure + and - can't be mistaken for, or joined into ++ and -- |
| 364 |
$content = preg_replace( |
| 365 |
array( |
| 366 |
'/(?<![\+\-])\s*([\+\-])(?![\+\-])/', |
| 367 |
'/(?<![\+\-])([\+\-])\s*(?![\+\-])/', |
| 368 |
), |
| 369 |
'\\1', |
| 370 |
$content |
| 371 |
); |
| 372 |
|
| 373 |
// collapse whitespace around reserved words into single space |
| 374 |
$content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content); |
| 375 |
$content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content); |
| 376 |
|
| 377 |
/* |
| 378 |
* We didn't strip whitespace after a couple of operators because they |
| 379 |
* could be used in different contexts and we can't be sure it's ok to |
| 380 |
* strip the newlines. However, we can safely strip any non-line feed |
| 381 |
* whitespace that follows them. |
| 382 |
*/ |
| 383 |
$operatorsDiffBefore = array_diff($operators, $operatorsBefore); |
| 384 |
$operatorsDiffAfter = array_diff($operators, $operatorsAfter); |
| 385 |
$content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content); |
| 386 |
$content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content); |
| 387 |
|
| 388 |
/* |
| 389 |
* Whitespace after `return` can be omitted in a few occasions |
| 390 |
* (such as when followed by a string or regex) |
| 391 |
* Same for whitespace in between `)` and `{`, or between `{` and some |
| 392 |
* keywords. |
| 393 |
*/ |
| 394 |
$content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); |
| 395 |
$content = preg_replace('/\)\s+\{/', '){', $content); |
| 396 |
$content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); |
| 397 |
|
| 398 |
/* |
| 399 |
* Get rid of double semicolons, except where they can be used like: |
| 400 |
* "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". |
| 401 |
* I'll safeguard these double semicolons inside for-loops by |
| 402 |
* temporarily replacing them with an invalid condition: they won't have |
| 403 |
* a double semicolon and will be easy to spot to restore afterwards. |
| 404 |
*/ |
| 405 |
$content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); |
| 406 |
$content = preg_replace('/;+/', ';', $content); |
| 407 |
$content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); |
| 408 |
|
| 409 |
/* |
| 410 |
* Next, we'll be removing all semicolons where ASI kicks in. |
| 411 |
* for-loops however, can have an empty body (ending in only a |
| 412 |
* semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);` |
| 413 |
* Here, nothing happens during the loop; it's just used to keep |
| 414 |
* increasing `i`. With that ; omitted, the next line would be expected |
| 415 |
* to be the for-loop's body... Same goes for while loops. |
| 416 |
* I'm going to double that semicolon (if any) so after the next line, |
| 417 |
* which strips semicolons here & there, we're still left with this one. |
| 418 |
*/ |
| 419 |
$content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content); |
| 420 |
$content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
| 421 |
/* |
| 422 |
* Below will also keep `;` after a `do{}while();` along with `while();` |
| 423 |
* While these could be stripped after do-while, detecting this |
| 424 |
* distinction is cumbersome, so I'll play it safe and make sure `;` |
| 425 |
* after any kind of `while` is kept. |
| 426 |
*/ |
| 427 |
$content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
| 428 |
|
| 429 |
/* |
| 430 |
* We also can't strip empty else-statements. Even though they're |
| 431 |
* useless and probably shouldn't be in the code in the first place, we |
| 432 |
* shouldn't be stripping the `;` that follows it as it breaks the code. |
| 433 |
* We can just remove those useless else-statements completely. |
| 434 |
* |
| 435 |
* @see https://github.com/matthiasmullie/minify/issues/91 |
| 436 |
*/ |
| 437 |
$content = preg_replace('/else;/s', '', $content); |
| 438 |
|
| 439 |
/* |
| 440 |
* We also don't really want to terminate statements followed by closing |
| 441 |
* curly braces (which we've ignored completely up until now) or end-of- |
| 442 |
* script: ASI will kick in here & we're all about minifying. |
| 443 |
* Semicolons at beginning of the file don't make any sense either. |
| 444 |
*/ |
| 445 |
$content = preg_replace('/;(\}|$)/s', '\\1', $content); |
| 446 |
$content = ltrim($content, ';'); |
| 447 |
|
| 448 |
// get rid of remaining whitespace af beginning/end |
| 449 |
return trim($content); |
| 450 |
} |
| 451 |
|
| 452 |
/** |
| 453 |
* We'll strip whitespace around certain operators with regular expressions. |
| 454 |
* This will prepare the given array by escaping all characters. |
| 455 |
* |
| 456 |
* @param string[] $operators |
| 457 |
* @param string $delimiter |
| 458 |
* |
| 459 |
* @return string[] |
| 460 |
*/ |
| 461 |
protected function getOperatorsForRegex(array $operators, $delimiter = '/') |
| 462 |
{ |
| 463 |
// escape operators for use in regex |
| 464 |
$delimiters = array_fill(0, count($operators), $delimiter); |
| 465 |
$escaped = array_map('preg_quote', $operators, $delimiters); |
| 466 |
|
| 467 |
$operators = array_combine($operators, $escaped); |
| 468 |
|
| 469 |
// ignore + & - for now, they'll get special treatment |
| 470 |
unset($operators['+'], $operators['-']); |
| 471 |
|
| 472 |
// dot can not just immediately follow a number; it can be confused for |
| 473 |
// decimal point, or calling a method on it, e.g. 42 .toString() |
| 474 |
$operators['.'] = '(?<![0-9]\s)\.'; |
| 475 |
|
| 476 |
// don't confuse = with other assignment shortcuts (e.g. +=) |
| 477 |
$chars = preg_quote('+-*\=<>%&|', $delimiter); |
| 478 |
$operators['='] = '(?<!['.$chars.'])\='; |
| 479 |
|
| 480 |
return $operators; |
| 481 |
} |
| 482 |
|
| 483 |
/** |
| 484 |
* We'll strip whitespace around certain keywords with regular expressions. |
| 485 |
* This will prepare the given array by escaping all characters. |
| 486 |
* |
| 487 |
* @param string[] $keywords |
| 488 |
* @param string $delimiter |
| 489 |
* |
| 490 |
* @return string[] |
| 491 |
*/ |
| 492 |
protected function getKeywordsForRegex(array $keywords, $delimiter = '/') |
| 493 |
{ |
| 494 |
// escape keywords for use in regex |
| 495 |
$delimiter = array_fill(0, count($keywords), $delimiter); |
| 496 |
$escaped = array_map('preg_quote', $keywords, $delimiter); |
| 497 |
|
| 498 |
// add word boundaries |
| 499 |
array_walk($keywords, function ($value) { |
| 500 |
return '\b'.$value.'\b'; |
| 501 |
}); |
| 502 |
|
| 503 |
$keywords = array_combine($keywords, $escaped); |
| 504 |
|
| 505 |
return $keywords; |
| 506 |
} |
| 507 |
|
| 508 |
/** |
| 509 |
* Replaces all occurrences of array['key'] by array.key. |
| 510 |
* |
| 511 |
* @param string $content |
| 512 |
* |
| 513 |
* @return string |
| 514 |
*/ |
| 515 |
protected function propertyNotation($content) |
| 516 |
{ |
| 517 |
// PHP only supports $this inside anonymous functions since 5.4 |
| 518 |
$minifier = $this; |
| 519 |
$keywords = $this->keywordsReserved; |
| 520 |
$callback = function ($match) use ($minifier, $keywords) { |
| 521 |
$property = trim($minifier->extracted[$match[1]], '\'"'); |
| 522 |
|
| 523 |
/* |
| 524 |
* Check if the property is a reserved keyword. In this context (as |
| 525 |
* property of an object literal/array) it shouldn't matter, but IE8 |
| 526 |
* freaks out with "Expected identifier". |
| 527 |
*/ |
| 528 |
if (in_array($property, $keywords)) { |
| 529 |
return $match[0]; |
| 530 |
} |
| 531 |
|
| 532 |
/* |
| 533 |
* See if the property is in a variable-like format (e.g. |
| 534 |
* array['key-here'] can't be replaced by array.key-here since '-' |
| 535 |
* is not a valid character there. |
| 536 |
*/ |
| 537 |
if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) { |
| 538 |
return $match[0]; |
| 539 |
} |
| 540 |
|
| 541 |
return '.'.$property; |
| 542 |
}; |
| 543 |
|
| 544 |
/* |
| 545 |
* Figure out if previous character is a variable name (of the array |
| 546 |
* we want to use property notation on) - this is to make sure |
| 547 |
* standalone ['value'] arrays aren't confused for keys-of-an-array. |
| 548 |
* We can (and only have to) check the last character, because PHP's |
| 549 |
* regex implementation doesn't allow unfixed-length look-behind |
| 550 |
* assertions. |
| 551 |
*/ |
| 552 |
preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); |
| 553 |
$previousChar = $previousChar[1]; |
| 554 |
|
| 555 |
/* |
| 556 |
* Make sure word preceding the ['value'] is not a keyword, e.g. |
| 557 |
* return['x']. Because -again- PHP's regex implementation doesn't allow |
| 558 |
* unfixed-length look-behind assertions, I'm just going to do a lot of |
| 559 |
* separate look-behind assertions, one for each keyword. |
| 560 |
*/ |
| 561 |
$keywords = $this->getKeywordsForRegex($keywords); |
| 562 |
$keywords = '(?<!'.implode(')(?<!', $keywords).')'; |
| 563 |
|
| 564 |
return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); |
| 565 |
} |
| 566 |
|
| 567 |
/** |
| 568 |
* Replaces true & false by !0 and !1. |
| 569 |
* |
| 570 |
* @param string $content |
| 571 |
* |
| 572 |
* @return string |
| 573 |
*/ |
| 574 |
protected function shortenBools($content) |
| 575 |
{ |
| 576 |
/* |
| 577 |
* 'true' or 'false' could be used as property names (which may be |
| 578 |
* followed by whitespace) - we must not replace those! |
| 579 |
* Since PHP doesn't allow variable-length (to account for the |
| 580 |
* whitespace) lookbehind assertions, I need to capture the leading |
| 581 |
* character and check if it's a `.` |
| 582 |
*/ |
| 583 |
$callback = function ($match) { |
| 584 |
if (trim($match[1]) === '.') { |
| 585 |
return $match[0]; |
| 586 |
} |
| 587 |
|
| 588 |
return $match[1].($match[2] === 'true' ? '!0' : '!1'); |
| 589 |
}; |
| 590 |
$content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); |
| 591 |
|
| 592 |
// for(;;) is exactly the same as while(true), but shorter :) |
| 593 |
$content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); |
| 594 |
|
| 595 |
// now make sure we didn't turn any do ... while(true) into do ... for(;;) |
| 596 |
preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
| 597 |
|
| 598 |
// go backward to make sure positional offsets aren't altered when $content changes |
| 599 |
$dos = array_reverse($dos); |
| 600 |
foreach ($dos as $do) { |
| 601 |
$offsetDo = $do[0][1]; |
| 602 |
|
| 603 |
// find all `while` (now `for`) following `do`: one of those must be |
| 604 |
// associated with the `do` and be turned back into `while` |
| 605 |
preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); |
| 606 |
foreach ($whiles as $while) { |
| 607 |
$offsetWhile = $while[0][1]; |
| 608 |
|
| 609 |
$open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); |
| 610 |
$close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); |
| 611 |
if ($open === $close) { |
| 612 |
// only restore `while` if amount of `{` and `}` are the same; |
| 613 |
// otherwise, that `for` isn't associated with this `do` |
| 614 |
$content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); |
| 615 |
break; |
| 616 |
} |
| 617 |
} |
| 618 |
} |
| 619 |
|
| 620 |
return $content; |
| 621 |
} |
| 622 |
} |
| 623 |
|
