Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 1 | <?php |
| 2 | /** |
| 3 | * CSS 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 | */ |
| 11 | |
| 12 | namespace MatthiasMullie\Minify; |
| 13 | |
| 14 | use MatthiasMullie\Minify\Exceptions\FileImportException; |
| 15 | use MatthiasMullie\PathConverter\ConverterInterface; |
| 16 | use MatthiasMullie\PathConverter\Converter; |
| 17 | |
| 18 | /** |
| 19 | * CSS minifier |
| 20 | * |
| 21 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
| 22 | * |
| 23 | * @package Minify |
| 24 | * @author Matthias Mullie <minify@mullie.eu> |
| 25 | * @author Tijs Verkoyen <minify@verkoyen.eu> |
| 26 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
| 27 | * @license MIT License |
| 28 | */ |
| 29 | class CSS extends Minify |
| 30 | { |
| 31 | /** |
| 32 | * @var int maximum inport size in kB |
| 33 | */ |
| 34 | protected $maxImportSize = 5; |
| 35 | |
| 36 | /** |
| 37 | * @var string[] valid import extensions |
| 38 | */ |
| 39 | protected $importExtensions = array( |
| 40 | 'gif' => 'data:image/gif', |
| 41 | 'png' => 'data:image/png', |
| 42 | 'jpe' => 'data:image/jpeg', |
| 43 | 'jpg' => 'data:image/jpeg', |
| 44 | 'jpeg' => 'data:image/jpeg', |
| 45 | 'svg' => 'data:image/svg+xml', |
| 46 | 'woff' => 'data:application/x-font-woff', |
| 47 | 'tif' => 'image/tiff', |
| 48 | 'tiff' => 'image/tiff', |
| 49 | 'xbm' => 'image/x-xbitmap', |
| 50 | ); |
| 51 | |
| 52 | /** |
| 53 | * Set the maximum size if files to be imported. |
| 54 | * |
| 55 | * Files larger than this size (in kB) will not be imported into the CSS. |
| 56 | * Importing files into the CSS as data-uri will save you some connections, |
| 57 | * but we should only import relatively small decorative images so that our |
| 58 | * CSS file doesn't get too bulky. |
| 59 | * |
| 60 | * @param int $size Size in kB |
| 61 | */ |
| 62 | public function setMaxImportSize($size) |
| 63 | { |
| 64 | $this->maxImportSize = $size; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Set the type of extensions to be imported into the CSS (to save network |
| 69 | * connections). |
| 70 | * Keys of the array should be the file extensions & respective values |
| 71 | * should be the data type. |
| 72 | * |
| 73 | * @param string[] $extensions Array of file extensions |
| 74 | */ |
| 75 | public function setImportExtensions(array $extensions) |
| 76 | { |
| 77 | $this->importExtensions = $extensions; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Move any import statements to the top. |
| 82 | * |
| 83 | * @param string $content Nearly finished CSS content |
| 84 | * |
| 85 | * @return string |
| 86 | */ |
| 87 | protected function moveImportsToTop($content) |
| 88 | { |
| 89 | if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) { |
| 90 | // remove from content |
| 91 | foreach ($matches[0] as $import) { |
| 92 | $content = str_replace($import, '', $content); |
| 93 | } |
| 94 | |
| 95 | // add to top |
| 96 | $content = implode(';', $matches[2]).';'.trim($content, ';'); |
| 97 | } |
| 98 | |
| 99 | return $content; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Combine CSS from import statements. |
| 104 | * |
| 105 | * @import's will be loaded and their content merged into the original file, |
| 106 | * to save HTTP requests. |
| 107 | * |
| 108 | * @param string $source The file to combine imports for |
| 109 | * @param string $content The CSS content to combine imports for |
| 110 | * @param string[] $parents Parent paths, for circular reference checks |
| 111 | * |
| 112 | * @return string |
| 113 | * |
| 114 | * @throws FileImportException |
| 115 | */ |
| 116 | protected function combineImports($source, $content, $parents) |
| 117 | { |
| 118 | $importRegexes = array( |
| 119 | // @import url(xxx) |
| 120 | '/ |
| 121 | # import statement |
| 122 | @import |
| 123 | |
| 124 | # whitespace |
| 125 | \s+ |
| 126 | |
| 127 | # open url() |
| 128 | url\( |
| 129 | |
| 130 | # (optional) open path enclosure |
| 131 | (?P<quotes>["\']?) |
| 132 | |
| 133 | # fetch path |
| 134 | (?P<path>.+?) |
| 135 | |
| 136 | # (optional) close path enclosure |
| 137 | (?P=quotes) |
| 138 | |
| 139 | # close url() |
| 140 | \) |
| 141 | |
| 142 | # (optional) trailing whitespace |
| 143 | \s* |
| 144 | |
| 145 | # (optional) media statement(s) |
| 146 | (?P<media>[^;]*) |
| 147 | |
| 148 | # (optional) trailing whitespace |
| 149 | \s* |
| 150 | |
| 151 | # (optional) closing semi-colon |
| 152 | ;? |
| 153 | |
| 154 | /ix', |
| 155 | |
| 156 | // @import 'xxx' |
| 157 | '/ |
| 158 | |
| 159 | # import statement |
| 160 | @import |
| 161 | |
| 162 | # whitespace |
| 163 | \s+ |
| 164 | |
| 165 | # open path enclosure |
| 166 | (?P<quotes>["\']) |
| 167 | |
| 168 | # fetch path |
| 169 | (?P<path>.+?) |
| 170 | |
| 171 | # close path enclosure |
| 172 | (?P=quotes) |
| 173 | |
| 174 | # (optional) trailing whitespace |
| 175 | \s* |
| 176 | |
| 177 | # (optional) media statement(s) |
| 178 | (?P<media>[^;]*) |
| 179 | |
| 180 | # (optional) trailing whitespace |
| 181 | \s* |
| 182 | |
| 183 | # (optional) closing semi-colon |
| 184 | ;? |
| 185 | |
| 186 | /ix', |
| 187 | ); |
| 188 | |
| 189 | // find all relative imports in css |
| 190 | $matches = array(); |
| 191 | foreach ($importRegexes as $importRegex) { |
| 192 | if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
| 193 | $matches = array_merge($matches, $regexMatches); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | $search = array(); |
| 198 | $replace = array(); |
| 199 | |
| 200 | // loop the matches |
| 201 | foreach ($matches as $match) { |
| 202 | // get the path for the file that will be imported |
| 203 | $importPath = dirname($source).'/'.$match['path']; |
| 204 | |
| 205 | // only replace the import with the content if we can grab the |
| 206 | // content of the file |
| 207 | if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) { |
| 208 | continue; |
| 209 | } |
| 210 | |
| 211 | // check if current file was not imported previously in the same |
| 212 | // import chain. |
| 213 | if (in_array($importPath, $parents)) { |
| 214 | throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.'); |
| 215 | } |
| 216 | |
| 217 | // grab referenced file & minify it (which may include importing |
| 218 | // yet other @import statements recursively) |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 219 | $minifier = new self($importPath); |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 220 | $minifier->setMaxImportSize($this->maxImportSize); |
| 221 | $minifier->setImportExtensions($this->importExtensions); |
| 222 | $importContent = $minifier->execute($source, $parents); |
| 223 | |
| 224 | // check if this is only valid for certain media |
| 225 | if (!empty($match['media'])) { |
| 226 | $importContent = '@media '.$match['media'].'{'.$importContent.'}'; |
| 227 | } |
| 228 | |
| 229 | // add to replacement array |
| 230 | $search[] = $match[0]; |
| 231 | $replace[] = $importContent; |
| 232 | } |
| 233 | |
| 234 | // replace the import statements |
| 235 | return str_replace($search, $replace, $content); |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Import files into the CSS, base64-ized. |
| 240 | * |
| 241 | * @url(image.jpg) images will be loaded and their content merged into the |
| 242 | * original file, to save HTTP requests. |
| 243 | * |
| 244 | * @param string $source The file to import files for |
| 245 | * @param string $content The CSS content to import files for |
| 246 | * |
| 247 | * @return string |
| 248 | */ |
| 249 | protected function importFiles($source, $content) |
| 250 | { |
| 251 | $regex = '/url\((["\']?)(.+?)\\1\)/i'; |
| 252 | if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) { |
| 253 | $search = array(); |
| 254 | $replace = array(); |
| 255 | |
| 256 | // loop the matches |
| 257 | foreach ($matches as $match) { |
| 258 | $extension = substr(strrchr($match[2], '.'), 1); |
| 259 | if ($extension && !array_key_exists($extension, $this->importExtensions)) { |
| 260 | continue; |
| 261 | } |
| 262 | |
| 263 | // get the path for the file that will be imported |
| 264 | $path = $match[2]; |
| 265 | $path = dirname($source).'/'.$path; |
| 266 | |
| 267 | // only replace the import with the content if we're able to get |
| 268 | // the content of the file, and it's relatively small |
| 269 | if ($this->canImportFile($path) && $this->canImportBySize($path)) { |
| 270 | // grab content && base64-ize |
| 271 | $importContent = $this->load($path); |
| 272 | $importContent = base64_encode($importContent); |
| 273 | |
| 274 | // build replacement |
| 275 | $search[] = $match[0]; |
| 276 | $replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')'; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | // replace the import statements |
| 281 | $content = str_replace($search, $replace, $content); |
| 282 | } |
| 283 | |
| 284 | return $content; |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Minify the data. |
| 289 | * Perform CSS optimizations. |
| 290 | * |
| 291 | * @param string[optional] $path Path to write the data to |
| 292 | * @param string[] $parents Parent paths, for circular reference checks |
| 293 | * |
| 294 | * @return string The minified data |
| 295 | */ |
| 296 | public function execute($path = null, $parents = array()) |
| 297 | { |
| 298 | $content = ''; |
| 299 | |
| 300 | // loop CSS data (raw data and files) |
| 301 | foreach ($this->data as $source => $css) { |
| 302 | /* |
| 303 | * Let's first take out strings & comments, since we can't just |
| 304 | * remove whitespace anywhere. If whitespace occurs inside a string, |
| 305 | * we should leave it alone. E.g.: |
| 306 | * p { content: "a test" } |
| 307 | */ |
| 308 | $this->extractStrings(); |
| 309 | $this->stripComments(); |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 310 | $this->extractMath(); |
| 311 | $this->extractCustomProperties(); |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 312 | $css = $this->replace($css); |
| 313 | |
| 314 | $css = $this->stripWhitespace($css); |
| 315 | $css = $this->shortenColors($css); |
| 316 | $css = $this->shortenZeroes($css); |
| 317 | $css = $this->shortenFontWeights($css); |
| 318 | $css = $this->stripEmptyTags($css); |
| 319 | |
| 320 | // restore the string we've extracted earlier |
| 321 | $css = $this->restoreExtractedData($css); |
| 322 | |
| 323 | $source = is_int($source) ? '' : $source; |
| 324 | $parents = $source ? array_merge($parents, array($source)) : $parents; |
| 325 | $css = $this->combineImports($source, $css, $parents); |
| 326 | $css = $this->importFiles($source, $css); |
| 327 | |
| 328 | /* |
| 329 | * If we'll save to a new path, we'll have to fix the relative paths |
| 330 | * to be relative no longer to the source file, but to the new path. |
| 331 | * If we don't write to a file, fall back to same path so no |
| 332 | * conversion happens (because we still want it to go through most |
| 333 | * of the move code, which also addresses url() & @import syntax...) |
| 334 | */ |
| 335 | $converter = $this->getPathConverter($source, $path ?: $source); |
| 336 | $css = $this->move($converter, $css); |
| 337 | |
| 338 | // combine css |
| 339 | $content .= $css; |
| 340 | } |
| 341 | |
| 342 | $content = $this->moveImportsToTop($content); |
| 343 | |
| 344 | return $content; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Moving a css file should update all relative urls. |
| 349 | * Relative references (e.g. ../images/image.gif) in a certain css file, |
| 350 | * will have to be updated when a file is being saved at another location |
| 351 | * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper). |
| 352 | * |
| 353 | * @param ConverterInterface $converter Relative path converter |
| 354 | * @param string $content The CSS content to update relative urls for |
| 355 | * |
| 356 | * @return string |
| 357 | */ |
| 358 | protected function move(ConverterInterface $converter, $content) |
| 359 | { |
| 360 | /* |
| 361 | * Relative path references will usually be enclosed by url(). @import |
| 362 | * is an exception, where url() is not necessary around the path (but is |
| 363 | * allowed). |
| 364 | * This *could* be 1 regular expression, where both regular expressions |
| 365 | * in this array are on different sides of a |. But we're using named |
| 366 | * patterns in both regexes, the same name on both regexes. This is only |
| 367 | * possible with a (?J) modifier, but that only works after a fairly |
| 368 | * recent PCRE version. That's why I'm doing 2 separate regular |
| 369 | * expressions & combining the matches after executing of both. |
| 370 | */ |
| 371 | $relativeRegexes = array( |
| 372 | // url(xxx) |
| 373 | '/ |
| 374 | # open url() |
| 375 | url\( |
| 376 | |
| 377 | \s* |
| 378 | |
| 379 | # open path enclosure |
| 380 | (?P<quotes>["\'])? |
| 381 | |
| 382 | # fetch path |
| 383 | (?P<path>.+?) |
| 384 | |
| 385 | # close path enclosure |
| 386 | (?(quotes)(?P=quotes)) |
| 387 | |
| 388 | \s* |
| 389 | |
| 390 | # close url() |
| 391 | \) |
| 392 | |
| 393 | /ix', |
| 394 | |
| 395 | // @import "xxx" |
| 396 | '/ |
| 397 | # import statement |
| 398 | @import |
| 399 | |
| 400 | # whitespace |
| 401 | \s+ |
| 402 | |
| 403 | # we don\'t have to check for @import url(), because the |
| 404 | # condition above will already catch these |
| 405 | |
| 406 | # open path enclosure |
| 407 | (?P<quotes>["\']) |
| 408 | |
| 409 | # fetch path |
| 410 | (?P<path>.+?) |
| 411 | |
| 412 | # close path enclosure |
| 413 | (?P=quotes) |
| 414 | |
| 415 | /ix', |
| 416 | ); |
| 417 | |
| 418 | // find all relative urls in css |
| 419 | $matches = array(); |
| 420 | foreach ($relativeRegexes as $relativeRegex) { |
| 421 | if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
| 422 | $matches = array_merge($matches, $regexMatches); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | $search = array(); |
| 427 | $replace = array(); |
| 428 | |
| 429 | // loop all urls |
| 430 | foreach ($matches as $match) { |
| 431 | // determine if it's a url() or an @import match |
| 432 | $type = (strpos($match[0], '@import') === 0 ? 'import' : 'url'); |
| 433 | |
| 434 | $url = $match['path']; |
| 435 | if ($this->canImportByPath($url)) { |
| 436 | // attempting to interpret GET-params makes no sense, so let's discard them for awhile |
| 437 | $params = strrchr($url, '?'); |
| 438 | $url = $params ? substr($url, 0, -strlen($params)) : $url; |
| 439 | |
| 440 | // fix relative url |
| 441 | $url = $converter->convert($url); |
| 442 | |
| 443 | // now that the path has been converted, re-apply GET-params |
| 444 | $url .= $params; |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Urls with control characters above 0x7e should be quoted. |
| 449 | * According to Mozilla's parser, whitespace is only allowed at the |
| 450 | * end of unquoted urls. |
| 451 | * Urls with `)` (as could happen with data: uris) should also be |
| 452 | * quoted to avoid being confused for the url() closing parentheses. |
| 453 | * And urls with a # have also been reported to cause issues. |
| 454 | * Urls with quotes inside should also remain escaped. |
| 455 | * |
| 456 | * @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation |
| 457 | * @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378 |
| 458 | * @see https://github.com/matthiasmullie/minify/issues/193 |
| 459 | */ |
| 460 | $url = trim($url); |
| 461 | if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) { |
| 462 | $url = $match['quotes'] . $url . $match['quotes']; |
| 463 | } |
| 464 | |
| 465 | // build replacement |
| 466 | $search[] = $match[0]; |
| 467 | if ($type === 'url') { |
| 468 | $replace[] = 'url('.$url.')'; |
| 469 | } elseif ($type === 'import') { |
| 470 | $replace[] = '@import "'.$url.'"'; |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | // replace urls |
| 475 | return str_replace($search, $replace, $content); |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * Shorthand hex color codes. |
| 480 | * #FF0000 -> #F00. |
| 481 | * |
| 482 | * @param string $content The CSS content to shorten the hex color codes for |
| 483 | * |
| 484 | * @return string |
| 485 | */ |
| 486 | protected function shortenColors($content) |
| 487 | { |
| 488 | $content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?:([0-9a-z])\\4)?(?=[; }])/i', '#$1$2$3$4', $content); |
| 489 | |
| 490 | // remove alpha channel if it's pointless... |
| 491 | $content = preg_replace('/(?<=[: ])#([0-9a-z]{6})ff?(?=[; }])/i', '#$1', $content); |
| 492 | $content = preg_replace('/(?<=[: ])#([0-9a-z]{3})f?(?=[; }])/i', '#$1', $content); |
| 493 | |
| 494 | $colors = array( |
| 495 | // we can shorten some even more by replacing them with their color name |
| 496 | '#F0FFFF' => 'azure', |
| 497 | '#F5F5DC' => 'beige', |
| 498 | '#A52A2A' => 'brown', |
| 499 | '#FF7F50' => 'coral', |
| 500 | '#FFD700' => 'gold', |
| 501 | '#808080' => 'gray', |
| 502 | '#008000' => 'green', |
| 503 | '#4B0082' => 'indigo', |
| 504 | '#FFFFF0' => 'ivory', |
| 505 | '#F0E68C' => 'khaki', |
| 506 | '#FAF0E6' => 'linen', |
| 507 | '#800000' => 'maroon', |
| 508 | '#000080' => 'navy', |
| 509 | '#808000' => 'olive', |
| 510 | '#CD853F' => 'peru', |
| 511 | '#FFC0CB' => 'pink', |
| 512 | '#DDA0DD' => 'plum', |
| 513 | '#800080' => 'purple', |
| 514 | '#F00' => 'red', |
| 515 | '#FA8072' => 'salmon', |
| 516 | '#A0522D' => 'sienna', |
| 517 | '#C0C0C0' => 'silver', |
| 518 | '#FFFAFA' => 'snow', |
| 519 | '#D2B48C' => 'tan', |
| 520 | '#FF6347' => 'tomato', |
| 521 | '#EE82EE' => 'violet', |
| 522 | '#F5DEB3' => 'wheat', |
| 523 | // or the other way around |
| 524 | 'WHITE' => '#fff', |
| 525 | 'BLACK' => '#000', |
| 526 | ); |
| 527 | |
| 528 | return preg_replace_callback( |
| 529 | '/(?<=[: ])('.implode('|', array_keys($colors)).')(?=[; }])/i', |
| 530 | function ($match) use ($colors) { |
| 531 | return $colors[strtoupper($match[0])]; |
| 532 | }, |
| 533 | $content |
| 534 | ); |
| 535 | } |
| 536 | |
| 537 | /** |
| 538 | * Shorten CSS font weights. |
| 539 | * |
| 540 | * @param string $content The CSS content to shorten the font weights for |
| 541 | * |
| 542 | * @return string |
| 543 | */ |
| 544 | protected function shortenFontWeights($content) |
| 545 | { |
| 546 | $weights = array( |
| 547 | 'normal' => 400, |
| 548 | 'bold' => 700, |
| 549 | ); |
| 550 | |
| 551 | $callback = function ($match) use ($weights) { |
| 552 | return $match[1].$weights[$match[2]]; |
| 553 | }; |
| 554 | |
| 555 | return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content); |
| 556 | } |
| 557 | |
| 558 | /** |
| 559 | * Shorthand 0 values to plain 0, instead of e.g. -0em. |
| 560 | * |
| 561 | * @param string $content The CSS content to shorten the zero values for |
| 562 | * |
| 563 | * @return string |
| 564 | */ |
| 565 | protected function shortenZeroes($content) |
| 566 | { |
| 567 | // we don't want to strip units in `calc()` expressions: |
| 568 | // `5px - 0px` is valid, but `5px - 0` is not |
| 569 | // `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but |
| 570 | // `10 * 0` is invalid |
| 571 | // we've extracted calcs earlier, so we don't need to worry about this |
| 572 | |
| 573 | // reusable bits of code throughout these regexes: |
| 574 | // before & after are used to make sure we don't match lose unintended |
| 575 | // 0-like values (e.g. in #000, or in http://url/1.0) |
| 576 | // units can be stripped from 0 values, or used to recognize non 0 |
| 577 | // values (where wa may be able to strip a .0 suffix) |
| 578 | $before = '(?<=[:(, ])'; |
| 579 | $after = '(?=[ ,);}])'; |
| 580 | $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)'; |
| 581 | |
| 582 | // strip units after zeroes (0px -> 0) |
| 583 | // NOTE: it should be safe to remove all units for a 0 value, but in |
| 584 | // practice, Webkit (especially Safari) seems to stumble over at least |
| 585 | // 0%, potentially other units as well. Only stripping 'px' for now. |
| 586 | // @see https://github.com/matthiasmullie/minify/issues/60 |
| 587 | $content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content); |
| 588 | |
| 589 | // strip 0-digits (.0 -> 0) |
| 590 | $content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content); |
| 591 | // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px |
| 592 | $content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content); |
| 593 | // strip trailing 0: 50.00 -> 50, 50.00px -> 50px |
| 594 | $content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content); |
| 595 | // strip leading 0: 0.1 -> .1, 01.1 -> 1.1 |
| 596 | $content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content); |
| 597 | |
| 598 | // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0) |
| 599 | $content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content); |
| 600 | |
| 601 | // IE doesn't seem to understand a unitless flex-basis value (correct - |
| 602 | // it goes against the spec), so let's add it in again (make it `%`, |
| 603 | // which is only 1 char: 0%, 0px, 0 anything, it's all just the same) |
| 604 | // @see https://developer.mozilla.org/nl/docs/Web/CSS/flex |
| 605 | $content = preg_replace('/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content); |
| 606 | $content = preg_replace('/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content); |
| 607 | |
| 608 | return $content; |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * Strip empty tags from source code. |
| 613 | * |
| 614 | * @param string $content |
| 615 | * |
| 616 | * @return string |
| 617 | */ |
| 618 | protected function stripEmptyTags($content) |
| 619 | { |
| 620 | $content = preg_replace('/(?<=^)[^\{\};]+\{\s*\}/', '', $content); |
| 621 | $content = preg_replace('/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content); |
| 622 | |
| 623 | return $content; |
| 624 | } |
| 625 | |
| 626 | /** |
| 627 | * Strip comments from source code. |
| 628 | */ |
| 629 | protected function stripComments() |
| 630 | { |
| 631 | // PHP only supports $this inside anonymous functions since 5.4 |
| 632 | $minifier = $this; |
| 633 | $callback = function ($match) use ($minifier) { |
| 634 | $count = count($minifier->extracted); |
| 635 | $placeholder = '/*'.$count.'*/'; |
| 636 | $minifier->extracted[$placeholder] = $match[0]; |
| 637 | |
| 638 | return $placeholder; |
| 639 | }; |
| 640 | $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback); |
| 641 | |
| 642 | $this->registerPattern('/\/\*.*?\*\//s', ''); |
| 643 | } |
| 644 | |
| 645 | /** |
| 646 | * Strip whitespace. |
| 647 | * |
| 648 | * @param string $content The CSS content to strip the whitespace for |
| 649 | * |
| 650 | * @return string |
| 651 | */ |
| 652 | protected function stripWhitespace($content) |
| 653 | { |
| 654 | // remove leading & trailing whitespace |
| 655 | $content = preg_replace('/^\s*/m', '', $content); |
| 656 | $content = preg_replace('/\s*$/m', '', $content); |
| 657 | |
| 658 | // replace newlines with a single space |
| 659 | $content = preg_replace('/\s+/', ' ', $content); |
| 660 | |
| 661 | // remove whitespace around meta characters |
| 662 | // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex |
| 663 | $content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content); |
| 664 | $content = preg_replace('/([\[(:>\+])\s+/', '$1', $content); |
| 665 | $content = preg_replace('/\s+([\]\)>\+])/', '$1', $content); |
| 666 | $content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content); |
| 667 | |
| 668 | // whitespace around + and - can only be stripped inside some pseudo- |
| 669 | // classes, like `:nth-child(3+2n)` |
| 670 | // not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or |
| 671 | // selectors like `div.weird- p` |
| 672 | $pseudos = array('nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type'); |
| 673 | $content = preg_replace('/:('.implode('|', $pseudos).')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content); |
| 674 | |
| 675 | // remove semicolon/whitespace followed by closing bracket |
| 676 | $content = str_replace(';}', '}', $content); |
| 677 | |
| 678 | return trim($content); |
| 679 | } |
| 680 | |
| 681 | /** |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 682 | * Replace all occurrences of functions that may contain math, where |
| 683 | * whitespace around operators needs to be preserved (e.g. calc, clamp) |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 684 | */ |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 685 | protected function extractMath() |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 686 | { |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 687 | $functions = array('calc', 'clamp', 'min', 'max'); |
| 688 | $pattern = '/('. implode('|', $functions) .')(\(.+?)(?=$|;|})/m'; |
| 689 | |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 690 | // PHP only supports $this inside anonymous functions since 5.4 |
| 691 | $minifier = $this; |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 692 | $callback = function ($match) use ($minifier, $pattern, &$callback) { |
| 693 | $function = $match[1]; |
| 694 | $length = strlen($match[2]); |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 695 | $expr = ''; |
| 696 | $opened = 0; |
| 697 | |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 698 | // the regular expression for extracting math has 1 significant problem: |
| 699 | // it can't determine the correct closing parenthesis... |
| 700 | // instead, it'll match a larger portion of code to where it's certain that |
| 701 | // the calc() musts have ended, and we'll figure out which is the correct |
| 702 | // closing parenthesis here, by counting how many have opened |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 703 | for ($i = 0; $i < $length; $i++) { |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 704 | $char = $match[2][$i]; |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 705 | $expr .= $char; |
| 706 | if ($char === '(') { |
| 707 | $opened++; |
| 708 | } elseif ($char === ')' && --$opened === 0) { |
| 709 | break; |
| 710 | } |
| 711 | } |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 712 | |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 713 | // now that we've figured out where the calc() starts and ends, extract it |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 714 | $count = count($minifier->extracted); |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 715 | $placeholder = 'math('.$count.')'; |
| 716 | $minifier->extracted[$placeholder] = $function.'('.trim(substr($expr, 1, -1)).')'; |
| 717 | |
| 718 | // and since we've captured more code than required, we may have some leftover |
| 719 | // calc() in here too - go recursive on the remaining but of code to go figure |
| 720 | // that out and extract what is needed |
| 721 | $rest = str_replace($function.$expr, '', $match[0]); |
| 722 | $rest = preg_replace_callback($pattern, $callback, $rest); |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 723 | |
| 724 | return $placeholder.$rest; |
| 725 | }; |
| 726 | |
Matthias Andreas Benkard | e39c4f8 | 2021-01-06 17:59:39 +0100 | [diff] [blame^] | 727 | $this->registerPattern($pattern, $callback); |
| 728 | } |
| 729 | |
| 730 | /** |
| 731 | * Replace custom properties, whose values may be used in scenarios where |
| 732 | * we wouldn't want them to be minified (e.g. inside calc) |
| 733 | */ |
| 734 | protected function extractCustomProperties() |
| 735 | { |
| 736 | // PHP only supports $this inside anonymous functions since 5.4 |
| 737 | $minifier = $this; |
| 738 | $this->registerPattern( |
| 739 | '/(?<=^|[;}])(--[^:;{}"\'\s]+)\s*:([^;{}]+)/m', |
| 740 | function ($match) use ($minifier) { |
| 741 | $placeholder = '--custom-'. count($minifier->extracted) . ':0'; |
| 742 | $minifier->extracted[$placeholder] = $match[1] .':'. trim($match[2]); |
| 743 | return $placeholder; |
| 744 | |
| 745 | } |
| 746 | ); |
Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | /** |
| 750 | * Check if file is small enough to be imported. |
| 751 | * |
| 752 | * @param string $path The path to the file |
| 753 | * |
| 754 | * @return bool |
| 755 | */ |
| 756 | protected function canImportBySize($path) |
| 757 | { |
| 758 | return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024; |
| 759 | } |
| 760 | |
| 761 | /** |
| 762 | * Check if file a file can be imported, going by the path. |
| 763 | * |
| 764 | * @param string $path |
| 765 | * |
| 766 | * @return bool |
| 767 | */ |
| 768 | protected function canImportByPath($path) |
| 769 | { |
| 770 | return preg_match('/^(data:|https?:|\\/)/', $path) === 0; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * Return a converter to update relative paths to be relative to the new |
| 775 | * destination. |
| 776 | * |
| 777 | * @param string $source |
| 778 | * @param string $target |
| 779 | * |
| 780 | * @return ConverterInterface |
| 781 | */ |
| 782 | protected function getPathConverter($source, $target) |
| 783 | { |
| 784 | return new Converter($source, $target); |
| 785 | } |
| 786 | } |