admin-bar
1 year ago
client-migration
7 months ago
compatibility
1 year ago
customizer
1 day ago
freemius
9 months ago
menu-icons
1 year ago
metabox
1 year ago
onboarding
1 month ago
panel
10 months ago
post-settings
3 months ago
preloader
1 year ago
shortcodes
1 year ago
themepanel
1 year ago
widgets
1 day ago
wizard
3 years ago
adobe-font.php
1 year ago
custom-code.php
9 months ago
dashboard.php
1 year ago
image-resizer.php
1 year ago
jshrink.php
3 years ago
mautic.php
3 months ago
ocean-extra-strings.php
3 years ago
plugins-tab.php
1 year ago
update-message.php
1 year ago
utils.php
1 year ago
walker.php
4 years ago
jshrink.php
721 lines
| 1 | <?php |
| 2 | /* |
| 3 | * This file is part of the JShrink package. |
| 4 | * |
| 5 | * (c) Robert Hafner <tedivm@tedivm.com> |
| 6 | * |
| 7 | * For the full copyright and license information, please view the LICENSE |
| 8 | * file that was distributed with this source code. |
| 9 | */ |
| 10 | |
| 11 | /** |
| 12 | * JShrink |
| 13 | * |
| 14 | * |
| 15 | * @package JShrink |
| 16 | * @author Robert Hafner <tedivm@tedivm.com> |
| 17 | */ |
| 18 | |
| 19 | namespace OceanWP; |
| 20 | |
| 21 | // Exit if accessed directly. |
| 22 | if ( ! defined( 'ABSPATH' ) ) { |
| 23 | exit; |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Minifier |
| 28 | * |
| 29 | * Usage - Minifier::minify($js); |
| 30 | * Usage - Minifier::minify($js, $options); |
| 31 | * Usage - Minifier::minify($js, array('flaggedComments' => false)); |
| 32 | * |
| 33 | * @package JShrink |
| 34 | * @author Robert Hafner <tedivm@tedivm.com> |
| 35 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License |
| 36 | */ |
| 37 | class Minifier |
| 38 | { |
| 39 | /** |
| 40 | * The input javascript to be minified. |
| 41 | * |
| 42 | * @var string |
| 43 | */ |
| 44 | protected $input; |
| 45 | |
| 46 | /** |
| 47 | * Length of input javascript. |
| 48 | * |
| 49 | * @var int |
| 50 | */ |
| 51 | protected $len = 0; |
| 52 | |
| 53 | /** |
| 54 | * The location of the character (in the input string) that is next to be |
| 55 | * processed. |
| 56 | * |
| 57 | * @var int |
| 58 | */ |
| 59 | protected $index = 0; |
| 60 | |
| 61 | /** |
| 62 | * The first of the characters currently being looked at. |
| 63 | * |
| 64 | * @var string |
| 65 | */ |
| 66 | protected $a = ''; |
| 67 | |
| 68 | /** |
| 69 | * The next character being looked at (after a); |
| 70 | * |
| 71 | * @var string |
| 72 | */ |
| 73 | protected $b = ''; |
| 74 | |
| 75 | /** |
| 76 | * This character is only active when certain look ahead actions take place. |
| 77 | * |
| 78 | * @var string |
| 79 | */ |
| 80 | protected $c; |
| 81 | |
| 82 | /** |
| 83 | * This character is only active when certain look ahead actions take place. |
| 84 | * |
| 85 | * @var string |
| 86 | */ |
| 87 | protected $last_char; |
| 88 | |
| 89 | /** |
| 90 | * This character is only active when certain look ahead actions take place. |
| 91 | * |
| 92 | * @var string |
| 93 | */ |
| 94 | protected $output; |
| 95 | |
| 96 | /** |
| 97 | * Contains the options for the current minification process. |
| 98 | * |
| 99 | * @var array |
| 100 | */ |
| 101 | protected $options; |
| 102 | |
| 103 | /** |
| 104 | * These characters are used to define strings. |
| 105 | */ |
| 106 | protected $stringDelimiters = ['\'' => true, '"' => true, '`' => true]; |
| 107 | |
| 108 | /** |
| 109 | * Contains the default options for minification. This array is merged with |
| 110 | * the one passed in by the user to create the request specific set of |
| 111 | * options (stored in the $options attribute). |
| 112 | * |
| 113 | * @var array |
| 114 | */ |
| 115 | protected static $defaultOptions = ['flaggedComments' => true]; |
| 116 | |
| 117 | |
| 118 | protected static $keywords = ["delete", "do", "for", "in", "instanceof", "return", "typeof", "yield"]; |
| 119 | |
| 120 | /** |
| 121 | * Contains lock ids which are used to replace certain code patterns and |
| 122 | * prevent them from being minified |
| 123 | * |
| 124 | * @var array |
| 125 | */ |
| 126 | protected $locks = []; |
| 127 | |
| 128 | /** |
| 129 | * Takes a string containing javascript and removes unneeded characters in |
| 130 | * order to shrink the code without altering it's functionality. |
| 131 | * |
| 132 | * @param string $js The raw javascript to be minified |
| 133 | * @param array $options Various runtime options in an associative array |
| 134 | * @throws \Exception |
| 135 | * @return bool|string |
| 136 | */ |
| 137 | public static function minify($js, $options = []) |
| 138 | { |
| 139 | try { |
| 140 | $jshrink = new Minifier(); |
| 141 | $js = $jshrink->lock($js); |
| 142 | $js = ltrim($jshrink->minifyToString($js, $options)); |
| 143 | $js = $jshrink->unlock($js); |
| 144 | unset($jshrink); |
| 145 | return $js; |
| 146 | } catch (\Exception $e) { |
| 147 | if (isset($jshrink)) { |
| 148 | // Since the breakdownScript function probably wasn't finished |
| 149 | // we clean it out before discarding it. |
| 150 | $jshrink->clean(); |
| 151 | unset($jshrink); |
| 152 | } |
| 153 | throw $e; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Processes a javascript string and outputs only the required characters, |
| 159 | * stripping out all unneeded characters. |
| 160 | * |
| 161 | * @param string $js The raw javascript to be minified |
| 162 | * @param array $options Various runtime options in an associative array |
| 163 | */ |
| 164 | protected function minifyToString($js, $options) |
| 165 | { |
| 166 | $this->initialize($js, $options); |
| 167 | $this->loop(); |
| 168 | $this->clean(); |
| 169 | return $this->output; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Initializes internal variables, normalizes new lines, |
| 174 | * |
| 175 | * @param string $js The raw javascript to be minified |
| 176 | * @param array $options Various runtime options in an associative array |
| 177 | */ |
| 178 | protected function initialize($js, $options) |
| 179 | { |
| 180 | $this->options = array_merge(static::$defaultOptions, $options); |
| 181 | $this->input = $js; |
| 182 | |
| 183 | // We add a newline to the end of the script to make it easier to deal |
| 184 | // with comments at the bottom of the script- this prevents the unclosed |
| 185 | // comment error that can otherwise occur. |
| 186 | $this->input .= PHP_EOL; |
| 187 | |
| 188 | // save input length to skip calculation every time |
| 189 | $this->len = strlen($this->input); |
| 190 | |
| 191 | // Populate "a" with a new line, "b" with the first character, before |
| 192 | // entering the loop |
| 193 | $this->a = "\n"; |
| 194 | $this->b = "\n"; |
| 195 | $this->last_char = "\n"; |
| 196 | $this->output = ""; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Characters that can't stand alone preserve the newline. |
| 201 | * |
| 202 | * @var array |
| 203 | */ |
| 204 | protected $noNewLineCharacters = [ |
| 205 | '(' => true, |
| 206 | '-' => true, |
| 207 | '+' => true, |
| 208 | '[' => true, |
| 209 | '@' => true]; |
| 210 | |
| 211 | |
| 212 | protected function echo($char) { |
| 213 | $this->output .= $char; |
| 214 | $this->last_char = $char[-1]; |
| 215 | } |
| 216 | |
| 217 | |
| 218 | /** |
| 219 | * The primary action occurs here. This function loops through the input string, |
| 220 | * outputting anything that's relevant and discarding anything that is not. |
| 221 | */ |
| 222 | protected function loop() |
| 223 | { |
| 224 | while ($this->a !== false && !is_null($this->a) && $this->a !== '') { |
| 225 | switch ($this->a) { |
| 226 | // new lines |
| 227 | case "\r": |
| 228 | case "\n": |
| 229 | // if the next line is something that can't stand alone preserve the newline |
| 230 | if ($this->b !== false && isset($this->noNewLineCharacters[$this->b])) { |
| 231 | $this->echo($this->a); |
| 232 | $this->saveString(); |
| 233 | break; |
| 234 | } |
| 235 | |
| 236 | // if B is a space we skip the rest of the switch block and go down to the |
| 237 | // string/regex check below, resetting $this->b with getReal |
| 238 | if ($this->b === ' ') { |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | // otherwise we treat the newline like a space |
| 243 | |
| 244 | // no break |
| 245 | case ' ': |
| 246 | if (static::isAlphaNumeric($this->b)) { |
| 247 | $this->echo($this->a); |
| 248 | } |
| 249 | |
| 250 | $this->saveString(); |
| 251 | break; |
| 252 | |
| 253 | default: |
| 254 | switch ($this->b) { |
| 255 | case "\r": |
| 256 | case "\n": |
| 257 | if (strpos('}])+-"\'', $this->a) !== false) { |
| 258 | $this->echo($this->a); |
| 259 | $this->saveString(); |
| 260 | break; |
| 261 | } else { |
| 262 | if (static::isAlphaNumeric($this->a)) { |
| 263 | $this->echo($this->a); |
| 264 | $this->saveString(); |
| 265 | } |
| 266 | } |
| 267 | break; |
| 268 | |
| 269 | case ' ': |
| 270 | if (!static::isAlphaNumeric($this->a)) { |
| 271 | break; |
| 272 | } |
| 273 | |
| 274 | // no break |
| 275 | default: |
| 276 | // check for some regex that breaks stuff |
| 277 | if ($this->a === '/' && ($this->b === '\'' || $this->b === '"')) { |
| 278 | $this->saveRegex(); |
| 279 | continue 3; |
| 280 | } |
| 281 | |
| 282 | $this->echo($this->a); |
| 283 | $this->saveString(); |
| 284 | break; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | // do reg check of doom |
| 289 | $this->b = $this->getReal(); |
| 290 | |
| 291 | if ($this->b == '/') { |
| 292 | $valid_tokens = "(,=:[!&|?\n"; |
| 293 | |
| 294 | # Find last "real" token, excluding spaces. |
| 295 | $last_token = $this->a; |
| 296 | if ($last_token == " ") { |
| 297 | $last_token = $this->last_char; |
| 298 | } |
| 299 | |
| 300 | if (strpos($valid_tokens, $last_token) !== false) { |
| 301 | // Regex can appear unquoted after these symbols |
| 302 | $this->saveRegex(); |
| 303 | } else if ($this->endsInKeyword()) { |
| 304 | // This block checks for the "return" token before the slash. |
| 305 | $this->saveRegex(); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | // if (($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false)) { |
| 310 | // $this->saveRegex(); |
| 311 | // } |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Resets attributes that do not need to be stored between requests so that |
| 317 | * the next request is ready to go. Another reason for this is to make sure |
| 318 | * the variables are cleared and are not taking up memory. |
| 319 | */ |
| 320 | protected function clean() |
| 321 | { |
| 322 | unset($this->input); |
| 323 | $this->len = 0; |
| 324 | $this->index = 0; |
| 325 | $this->a = $this->b = ''; |
| 326 | unset($this->c); |
| 327 | unset($this->options); |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * Returns the next string for processing based off of the current index. |
| 332 | * |
| 333 | * @return string |
| 334 | */ |
| 335 | protected function getChar() |
| 336 | { |
| 337 | // Check to see if we had anything in the look ahead buffer and use that. |
| 338 | if (isset($this->c)) { |
| 339 | $char = $this->c; |
| 340 | unset($this->c); |
| 341 | } else { |
| 342 | // Otherwise we start pulling from the input. |
| 343 | $char = $this->index < $this->len ? $this->input[$this->index] : false; |
| 344 | |
| 345 | // If the next character doesn't exist return false. |
| 346 | if (isset($char) && $char === false) { |
| 347 | return false; |
| 348 | } |
| 349 | |
| 350 | // Otherwise increment the pointer and use this char. |
| 351 | $this->index++; |
| 352 | } |
| 353 | |
| 354 | # Convert all line endings to unix standard. |
| 355 | # `\r\n` converts to `\n\n` and is minified. |
| 356 | if ($char == "\r") { |
| 357 | $char = "\n"; |
| 358 | } |
| 359 | |
| 360 | // Normalize all whitespace except for the newline character into a |
| 361 | // standard space. |
| 362 | if ($char !== "\n" && $char < "\x20") { |
| 363 | return ' '; |
| 364 | } |
| 365 | |
| 366 | return $char; |
| 367 | } |
| 368 | |
| 369 | /** |
| 370 | * This function returns the next character without moving the index forward. |
| 371 | * |
| 372 | * |
| 373 | * @return string The next character |
| 374 | * @throws \RuntimeException |
| 375 | */ |
| 376 | protected function peek() |
| 377 | { |
| 378 | if ($this->index >= $this->len) { |
| 379 | return false; |
| 380 | } |
| 381 | |
| 382 | $char = $this->input[$this->index]; |
| 383 | # Convert all line endings to unix standard. |
| 384 | # `\r\n` converts to `\n\n` and is minified. |
| 385 | if ($char == "\r") { |
| 386 | $char = "\n"; |
| 387 | } |
| 388 | |
| 389 | // Normalize all whitespace except for the newline character into a |
| 390 | // standard space. |
| 391 | if ($char !== "\n" && $char < "\x20") { |
| 392 | return ' '; |
| 393 | } |
| 394 | |
| 395 | # Return the next character but don't push the index. |
| 396 | return $char; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * This function gets the next "real" character. It is essentially a wrapper |
| 401 | * around the getChar function that skips comments. This has significant |
| 402 | * performance benefits as the skipping is done using native functions (ie, |
| 403 | * c code) rather than in script php. |
| 404 | * |
| 405 | * |
| 406 | * @return string Next 'real' character to be processed. |
| 407 | * @throws \RuntimeException |
| 408 | */ |
| 409 | protected function getReal() |
| 410 | { |
| 411 | $startIndex = $this->index; |
| 412 | $char = $this->getChar(); |
| 413 | |
| 414 | // Check to see if we're potentially in a comment |
| 415 | if ($char !== '/') { |
| 416 | return $char; |
| 417 | } |
| 418 | |
| 419 | $this->c = $this->getChar(); |
| 420 | |
| 421 | if ($this->c === '/') { |
| 422 | $this->processOneLineComments($startIndex); |
| 423 | |
| 424 | return $this->getReal(); |
| 425 | } elseif ($this->c === '*') { |
| 426 | $this->processMultiLineComments($startIndex); |
| 427 | |
| 428 | return $this->getReal(); |
| 429 | } |
| 430 | |
| 431 | return $char; |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Removed one line comments, with the exception of some very specific types of |
| 436 | * conditional comments. |
| 437 | * |
| 438 | * @param int $startIndex The index point where "getReal" function started |
| 439 | * @return void |
| 440 | */ |
| 441 | protected function processOneLineComments($startIndex) |
| 442 | { |
| 443 | $thirdCommentString = $this->index < $this->len ? $this->input[$this->index] : false; |
| 444 | |
| 445 | // kill rest of line |
| 446 | $this->getNext("\n"); |
| 447 | |
| 448 | unset($this->c); |
| 449 | |
| 450 | if ($thirdCommentString == '@') { |
| 451 | $endPoint = $this->index - $startIndex; |
| 452 | $this->c = "\n" . substr($this->input, $startIndex, $endPoint); |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * Skips multiline comments where appropriate, and includes them where needed. |
| 458 | * Conditional comments and "license" style blocks are preserved. |
| 459 | * |
| 460 | * @param int $startIndex The index point where "getReal" function started |
| 461 | * @return void |
| 462 | * @throws \RuntimeException Unclosed comments will throw an error |
| 463 | */ |
| 464 | protected function processMultiLineComments($startIndex) |
| 465 | { |
| 466 | $this->getChar(); // current C |
| 467 | $thirdCommentString = $this->getChar(); |
| 468 | |
| 469 | // Detect a completely empty comment, ie `/**/` |
| 470 | if ($thirdCommentString == "*") { |
| 471 | $peekChar = $this->peek(); |
| 472 | if ($peekChar == "/") { |
| 473 | $this->index++; |
| 474 | return; |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | // kill everything up to the next */ if it's there |
| 479 | if ($this->getNext('*/')) { |
| 480 | $this->getChar(); // get * |
| 481 | $this->getChar(); // get / |
| 482 | $char = $this->getChar(); // get next real character |
| 483 | |
| 484 | // Now we reinsert conditional comments and YUI-style licensing comments |
| 485 | if (($this->options['flaggedComments'] && $thirdCommentString === '!') |
| 486 | || ($thirdCommentString === '@')) { |
| 487 | |
| 488 | // If conditional comments or flagged comments are not the first thing in the script |
| 489 | // we need to echo a and fill it with a space before moving on. |
| 490 | if ($startIndex > 0) { |
| 491 | $this->echo($this->a); |
| 492 | $this->a = " "; |
| 493 | |
| 494 | // If the comment started on a new line we let it stay on the new line |
| 495 | if ($this->input[($startIndex - 1)] === "\n") { |
| 496 | $this->echo("\n"); |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | $endPoint = ($this->index - 1) - $startIndex; |
| 501 | $this->echo(substr($this->input, $startIndex, $endPoint)); |
| 502 | |
| 503 | $this->c = $char; |
| 504 | |
| 505 | return; |
| 506 | } |
| 507 | } else { |
| 508 | $char = false; |
| 509 | } |
| 510 | |
| 511 | if ($char === false) { |
| 512 | throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2)); |
| 513 | } |
| 514 | |
| 515 | // if we're here c is part of the comment and therefore tossed |
| 516 | $this->c = $char; |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * Pushes the index ahead to the next instance of the supplied string. If it |
| 521 | * is found the first character of the string is returned and the index is set |
| 522 | * to it's position. |
| 523 | * |
| 524 | * @param string $string |
| 525 | * @return string|false Returns the first character of the string or false. |
| 526 | */ |
| 527 | protected function getNext($string) |
| 528 | { |
| 529 | // Find the next occurrence of "string" after the current position. |
| 530 | $pos = strpos($this->input, $string, $this->index); |
| 531 | |
| 532 | // If it's not there return false. |
| 533 | if ($pos === false) { |
| 534 | return false; |
| 535 | } |
| 536 | |
| 537 | // Adjust position of index to jump ahead to the asked for string |
| 538 | $this->index = $pos; |
| 539 | |
| 540 | // Return the first character of that string. |
| 541 | return $this->index < $this->len ? $this->input[$this->index] : false; |
| 542 | } |
| 543 | |
| 544 | /** |
| 545 | * When a javascript string is detected this function crawls for the end of |
| 546 | * it and saves the whole string. |
| 547 | * |
| 548 | * @throws \RuntimeException Unclosed strings will throw an error |
| 549 | */ |
| 550 | protected function saveString() |
| 551 | { |
| 552 | $startpos = $this->index; |
| 553 | |
| 554 | // saveString is always called after a gets cleared, so we push b into |
| 555 | // that spot. |
| 556 | $this->a = $this->b; |
| 557 | |
| 558 | // If this isn't a string we don't need to do anything. |
| 559 | if (!isset($this->stringDelimiters[$this->a])) { |
| 560 | return; |
| 561 | } |
| 562 | |
| 563 | // String type is the quote used, " or ' |
| 564 | $stringType = $this->a; |
| 565 | |
| 566 | // Echo out that starting quote |
| 567 | $this->echo($this->a); |
| 568 | |
| 569 | // Loop until the string is done |
| 570 | // Grab the very next character and load it into a |
| 571 | while (($this->a = $this->getChar()) !== false) { |
| 572 | switch ($this->a) { |
| 573 | |
| 574 | // If the string opener (single or double quote) is used |
| 575 | // output it and break out of the while loop- |
| 576 | // The string is finished! |
| 577 | case $stringType: |
| 578 | break 2; |
| 579 | |
| 580 | // New lines in strings without line delimiters are bad- actual |
| 581 | // new lines will be represented by the string \n and not the actual |
| 582 | // character, so those will be treated just fine using the switch |
| 583 | // block below. |
| 584 | case "\n": |
| 585 | if ($stringType === '`') { |
| 586 | $this->echo($this->a); |
| 587 | } else { |
| 588 | throw new \RuntimeException('Unclosed string at position: ' . $startpos); |
| 589 | } |
| 590 | break; |
| 591 | |
| 592 | // Escaped characters get picked up here. If it's an escaped new line it's not really needed |
| 593 | case '\\': |
| 594 | |
| 595 | // a is a slash. We want to keep it, and the next character, |
| 596 | // unless it's a new line. New lines as actual strings will be |
| 597 | // preserved, but escaped new lines should be reduced. |
| 598 | $this->b = $this->getChar(); |
| 599 | |
| 600 | // If b is a new line we discard a and b and restart the loop. |
| 601 | if ($this->b === "\n") { |
| 602 | break; |
| 603 | } |
| 604 | |
| 605 | // echo out the escaped character and restart the loop. |
| 606 | $this->echo($this->a . $this->b); |
| 607 | break; |
| 608 | |
| 609 | |
| 610 | // Since we're not dealing with any special cases we simply |
| 611 | // output the character and continue our loop. |
| 612 | default: |
| 613 | $this->echo($this->a); |
| 614 | } |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /** |
| 619 | * When a regular expression is detected this function crawls for the end of |
| 620 | * it and saves the whole regex. |
| 621 | * |
| 622 | * @throws \RuntimeException Unclosed regex will throw an error |
| 623 | */ |
| 624 | protected function saveRegex() |
| 625 | { |
| 626 | if ($this->a != " ") { |
| 627 | $this->echo($this->a); |
| 628 | } |
| 629 | |
| 630 | $this->echo($this->b); |
| 631 | |
| 632 | while (($this->a = $this->getChar()) !== false) { |
| 633 | if ($this->a === '/') { |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | if ($this->a === '\\') { |
| 638 | $this->echo($this->a); |
| 639 | $this->a = $this->getChar(); |
| 640 | } |
| 641 | |
| 642 | if ($this->a === "\n") { |
| 643 | throw new \RuntimeException('Unclosed regex pattern at position: ' . $this->index); |
| 644 | } |
| 645 | |
| 646 | $this->echo($this->a); |
| 647 | } |
| 648 | $this->b = $this->getReal(); |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Checks to see if a character is alphanumeric. |
| 653 | * |
| 654 | * @param string $char Just one character |
| 655 | * @return bool |
| 656 | */ |
| 657 | protected static function isAlphaNumeric($char) |
| 658 | { |
| 659 | return preg_match('/^[\w\$\pL]$/', $char) === 1 || $char == '/'; |
| 660 | } |
| 661 | |
| 662 | protected function endsInKeyword() { |
| 663 | |
| 664 | # When this function is called A is not yet assigned to output. |
| 665 | $testOutput = $this->output . $this->a; |
| 666 | |
| 667 | foreach(static::$keywords as $keyword) { |
| 668 | if (preg_match('/[^\w]'.$keyword.'[ ]?$/i', $testOutput) === 1) { |
| 669 | return true; |
| 670 | } |
| 671 | } |
| 672 | return false; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | |
| 677 | /** |
| 678 | * Replace patterns in the given string and store the replacement |
| 679 | * |
| 680 | * @param string $js The string to lock |
| 681 | * @return bool |
| 682 | */ |
| 683 | protected function lock($js) |
| 684 | { |
| 685 | /* lock things like <code>"asd" + ++x;</code> */ |
| 686 | $lock = '"LOCK---' . crc32(time()) . '"'; |
| 687 | |
| 688 | $matches = []; |
| 689 | preg_match('/([+-])(\s+)([+-])/S', $js, $matches); |
| 690 | if (empty($matches)) { |
| 691 | return $js; |
| 692 | } |
| 693 | |
| 694 | $this->locks[$lock] = $matches[2]; |
| 695 | |
| 696 | $js = preg_replace('/([+-])\s+([+-])/S', "$1{$lock}$2", $js); |
| 697 | /* -- */ |
| 698 | |
| 699 | return $js; |
| 700 | } |
| 701 | |
| 702 | /** |
| 703 | * Replace "locks" with the original characters |
| 704 | * |
| 705 | * @param string $js The string to unlock |
| 706 | * @return bool |
| 707 | */ |
| 708 | protected function unlock($js) |
| 709 | { |
| 710 | if (empty($this->locks)) { |
| 711 | return $js; |
| 712 | } |
| 713 | |
| 714 | foreach ($this->locks as $lock => $replacement) { |
| 715 | $js = str_replace($lock, $replacement, $js); |
| 716 | } |
| 717 | |
| 718 | return $js; |
| 719 | } |
| 720 | } |
| 721 |