Exceptions
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CSS.php
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Exception.php
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JS.php
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Minify.php
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CSS.php
871 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * CSS Minifier. |
| 5 | * |
| 6 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
| 7 | * |
| 8 | * @author Matthias Mullie <minify@mullie.eu> |
| 9 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
| 10 | * @license MIT License |
| 11 | */ |
| 12 | |
| 13 | namespace MatthiasMullie\Minify; |
| 14 | |
| 15 | use MatthiasMullie\Minify\Exceptions\FileImportException; |
| 16 | use MatthiasMullie\PathConverter\Converter; |
| 17 | use MatthiasMullie\PathConverter\ConverterInterface; |
| 18 | |
| 19 | /** |
| 20 | * CSS minifier. |
| 21 | * |
| 22 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
| 23 | * |
| 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 | 'woff2' => 'data:application/x-font-woff2', |
| 48 | 'avif' => 'data:image/avif', |
| 49 | 'apng' => 'data:image/apng', |
| 50 | 'webp' => 'data:image/webp', |
| 51 | 'tif' => 'image/tiff', |
| 52 | 'tiff' => 'image/tiff', |
| 53 | 'xbm' => 'image/x-xbitmap', |
| 54 | ); |
| 55 | |
| 56 | /** |
| 57 | * Set the maximum size if files to be imported. |
| 58 | * |
| 59 | * Files larger than this size (in kB) will not be imported into the CSS. |
| 60 | * Importing files into the CSS as data-uri will save you some connections, |
| 61 | * but we should only import relatively small decorative images so that our |
| 62 | * CSS file doesn't get too bulky. |
| 63 | * |
| 64 | * @param int $size Size in kB |
| 65 | */ |
| 66 | public function setMaxImportSize($size) |
| 67 | { |
| 68 | $this->maxImportSize = $size; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Set the type of extensions to be imported into the CSS (to save network |
| 73 | * connections). |
| 74 | * Keys of the array should be the file extensions & respective values |
| 75 | * should be the data type. |
| 76 | * |
| 77 | * @param string[] $extensions Array of file extensions |
| 78 | */ |
| 79 | public function setImportExtensions(array $extensions) |
| 80 | { |
| 81 | $this->importExtensions = $extensions; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Move any import statements to the top. |
| 86 | * |
| 87 | * @param string $content Nearly finished CSS content |
| 88 | * |
| 89 | * @return string |
| 90 | */ |
| 91 | protected function moveImportsToTop($content) |
| 92 | { |
| 93 | if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) { |
| 94 | // remove from content |
| 95 | foreach ($matches[0] as $import) { |
| 96 | $content = str_replace($import, '', $content); |
| 97 | } |
| 98 | |
| 99 | // add to top |
| 100 | $content = implode(';', $matches[2]) . ';' . trim($content, ';'); |
| 101 | } |
| 102 | |
| 103 | return $content; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Combine CSS from import statements. |
| 108 | * |
| 109 | * \@import's will be loaded and their content merged into the original file, |
| 110 | * to save HTTP requests. |
| 111 | * |
| 112 | * @param string $source The file to combine imports for |
| 113 | * @param string $content The CSS content to combine imports for |
| 114 | * @param string[] $parents Parent paths, for circular reference checks |
| 115 | * |
| 116 | * @return string |
| 117 | * |
| 118 | * @throws FileImportException |
| 119 | */ |
| 120 | protected function combineImports($source, $content, $parents) |
| 121 | { |
| 122 | $importRegexes = array( |
| 123 | // @import url(xxx) |
| 124 | '/ |
| 125 | # import statement |
| 126 | @import |
| 127 | |
| 128 | # whitespace |
| 129 | \s+ |
| 130 | |
| 131 | # open url() |
| 132 | url\( |
| 133 | |
| 134 | # (optional) open path enclosure |
| 135 | (?P<quotes>["\']?) |
| 136 | |
| 137 | # fetch path |
| 138 | (?P<path>.+?) |
| 139 | |
| 140 | # (optional) close path enclosure |
| 141 | (?P=quotes) |
| 142 | |
| 143 | # close url() |
| 144 | \) |
| 145 | |
| 146 | # (optional) trailing whitespace |
| 147 | \s* |
| 148 | |
| 149 | # (optional) media statement(s) |
| 150 | (?P<media>[^;]*) |
| 151 | |
| 152 | # (optional) trailing whitespace |
| 153 | \s* |
| 154 | |
| 155 | # (optional) closing semi-colon |
| 156 | ;? |
| 157 | |
| 158 | /ix', |
| 159 | |
| 160 | // @import 'xxx' |
| 161 | '/ |
| 162 | |
| 163 | # import statement |
| 164 | @import |
| 165 | |
| 166 | # whitespace |
| 167 | \s+ |
| 168 | |
| 169 | # open path enclosure |
| 170 | (?P<quotes>["\']) |
| 171 | |
| 172 | # fetch path |
| 173 | (?P<path>.+?) |
| 174 | |
| 175 | # close path enclosure |
| 176 | (?P=quotes) |
| 177 | |
| 178 | # (optional) trailing whitespace |
| 179 | \s* |
| 180 | |
| 181 | # (optional) media statement(s) |
| 182 | (?P<media>[^;]*) |
| 183 | |
| 184 | # (optional) trailing whitespace |
| 185 | \s* |
| 186 | |
| 187 | # (optional) closing semi-colon |
| 188 | ;? |
| 189 | |
| 190 | /ix', |
| 191 | ); |
| 192 | |
| 193 | // find all relative imports in css |
| 194 | $matches = array(); |
| 195 | foreach ($importRegexes as $importRegex) { |
| 196 | if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
| 197 | $matches = array_merge($matches, $regexMatches); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | $search = array(); |
| 202 | $replace = array(); |
| 203 | |
| 204 | // loop the matches |
| 205 | foreach ($matches as $match) { |
| 206 | // get the path for the file that will be imported |
| 207 | $importPath = dirname($source) . '/' . $match['path']; |
| 208 | |
| 209 | // only replace the import with the content if we can grab the |
| 210 | // content of the file |
| 211 | if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) { |
| 212 | continue; |
| 213 | } |
| 214 | |
| 215 | // check if current file was not imported previously in the same |
| 216 | // import chain. |
| 217 | if (in_array($importPath, $parents)) { |
| 218 | throw new FileImportException('Failed to import file "' . $importPath . '": circular reference detected.'); |
| 219 | } |
| 220 | |
| 221 | // grab referenced file & minify it (which may include importing |
| 222 | // yet other @import statements recursively) |
| 223 | $minifier = new self($importPath); |
| 224 | $minifier->setMaxImportSize($this->maxImportSize); |
| 225 | $minifier->setImportExtensions($this->importExtensions); |
| 226 | $importContent = $minifier->execute($source, $parents); |
| 227 | |
| 228 | // check if this is only valid for certain media |
| 229 | if (!empty($match['media'])) { |
| 230 | $importContent = '@media ' . $match['media'] . '{' . $importContent . '}'; |
| 231 | } |
| 232 | |
| 233 | // add to replacement array |
| 234 | $search[] = $match[0]; |
| 235 | $replace[] = $importContent; |
| 236 | } |
| 237 | |
| 238 | // replace the import statements |
| 239 | return str_replace($search, $replace, $content); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Import files into the CSS, base64-ized. |
| 244 | * |
| 245 | * @url(image.jpg) images will be loaded and their content merged into the |
| 246 | * original file, to save HTTP requests. |
| 247 | * |
| 248 | * @param string $source The file to import files for |
| 249 | * @param string $content The CSS content to import files for |
| 250 | * |
| 251 | * @return string |
| 252 | */ |
| 253 | protected function importFiles($source, $content) |
| 254 | { |
| 255 | $regex = '/url\((["\']?)(.+?)\\1\)/i'; |
| 256 | if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) { |
| 257 | $search = array(); |
| 258 | $replace = array(); |
| 259 | |
| 260 | // loop the matches |
| 261 | foreach ($matches as $match) { |
| 262 | $extension = substr(strrchr($match[2], '.'), 1); |
| 263 | if ($extension && !array_key_exists($extension, $this->importExtensions)) { |
| 264 | continue; |
| 265 | } |
| 266 | |
| 267 | // get the path for the file that will be imported |
| 268 | $path = $match[2]; |
| 269 | $path = dirname($source) . '/' . $path; |
| 270 | |
| 271 | // only replace the import with the content if we're able to get |
| 272 | // the content of the file, and it's relatively small |
| 273 | if ($this->canImportFile($path) && $this->canImportBySize($path)) { |
| 274 | // grab content && base64-ize |
| 275 | $importContent = $this->load($path); |
| 276 | $importContent = base64_encode($importContent); |
| 277 | |
| 278 | // build replacement |
| 279 | $search[] = $match[0]; |
| 280 | $replace[] = 'url(' . $this->importExtensions[$extension] . ';base64,' . $importContent . ')'; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | // replace the import statements |
| 285 | $content = str_replace($search, $replace, $content); |
| 286 | } |
| 287 | |
| 288 | return $content; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Minify the data. |
| 293 | * Perform CSS optimizations. |
| 294 | * |
| 295 | * @param string[optional] $path Path to write the data to |
| 296 | * @param string[] $parents Parent paths, for circular reference checks |
| 297 | * |
| 298 | * @return string The minified data |
| 299 | */ |
| 300 | public function execute($path = null, $parents = array()) |
| 301 | { |
| 302 | $content = ''; |
| 303 | |
| 304 | // loop CSS data (raw data and files) |
| 305 | foreach ($this->data as $source => $css) { |
| 306 | /* |
| 307 | * Let's first take out strings & comments, since we can't just |
| 308 | * remove whitespace anywhere. If whitespace occurs inside a string, |
| 309 | * we should leave it alone. E.g.: |
| 310 | * p { content: "a test" } |
| 311 | */ |
| 312 | $this->extractStrings(); |
| 313 | $this->stripComments(); |
| 314 | $this->extractMath(); |
| 315 | $this->extractCustomProperties(); |
| 316 | $css = $this->replace($css); |
| 317 | |
| 318 | $css = $this->stripWhitespace($css); |
| 319 | $css = $this->convertLegacyColors($css); |
| 320 | $css = $this->cleanupModernColors($css); |
| 321 | $css = $this->shortenHEXColors($css); |
| 322 | $css = $this->shortenZeroes($css); |
| 323 | $css = $this->shortenFontWeights($css); |
| 324 | $css = $this->stripEmptyTags($css); |
| 325 | |
| 326 | // restore the string we've extracted earlier |
| 327 | $css = $this->restoreExtractedData($css); |
| 328 | |
| 329 | $source = is_int($source) ? '' : $source; |
| 330 | $parents = $source ? array_merge($parents, array($source)) : $parents; |
| 331 | $css = $this->combineImports($source, $css, $parents); |
| 332 | $css = $this->importFiles($source, $css); |
| 333 | |
| 334 | /* |
| 335 | * If we'll save to a new path, we'll have to fix the relative paths |
| 336 | * to be relative no longer to the source file, but to the new path. |
| 337 | * If we don't write to a file, fall back to same path so no |
| 338 | * conversion happens (because we still want it to go through most |
| 339 | * of the move code, which also addresses url() & @import syntax...) |
| 340 | */ |
| 341 | $converter = $this->getPathConverter($source, $path ?: $source); |
| 342 | $css = $this->move($converter, $css); |
| 343 | |
| 344 | // combine css |
| 345 | $content .= $css; |
| 346 | } |
| 347 | |
| 348 | $content = $this->moveImportsToTop($content); |
| 349 | |
| 350 | return $content; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * Moving a css file should update all relative urls. |
| 355 | * Relative references (e.g. ../images/image.gif) in a certain css file, |
| 356 | * will have to be updated when a file is being saved at another location |
| 357 | * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper). |
| 358 | * |
| 359 | * @param ConverterInterface $converter Relative path converter |
| 360 | * @param string $content The CSS content to update relative urls for |
| 361 | * |
| 362 | * @return string |
| 363 | */ |
| 364 | protected function move(ConverterInterface $converter, $content) |
| 365 | { |
| 366 | /* |
| 367 | * Relative path references will usually be enclosed by url(). @import |
| 368 | * is an exception, where url() is not necessary around the path (but is |
| 369 | * allowed). |
| 370 | * This *could* be 1 regular expression, where both regular expressions |
| 371 | * in this array are on different sides of a |. But we're using named |
| 372 | * patterns in both regexes, the same name on both regexes. This is only |
| 373 | * possible with a (?J) modifier, but that only works after a fairly |
| 374 | * recent PCRE version. That's why I'm doing 2 separate regular |
| 375 | * expressions & combining the matches after executing of both. |
| 376 | */ |
| 377 | $relativeRegexes = array( |
| 378 | // url(xxx) |
| 379 | '/ |
| 380 | # open url() |
| 381 | url\( |
| 382 | |
| 383 | \s* |
| 384 | |
| 385 | # open path enclosure |
| 386 | (?P<quotes>["\'])? |
| 387 | |
| 388 | # fetch path |
| 389 | (?P<path>.+?) |
| 390 | |
| 391 | # close path enclosure |
| 392 | (?(quotes)(?P=quotes)) |
| 393 | |
| 394 | \s* |
| 395 | |
| 396 | # close url() |
| 397 | \) |
| 398 | |
| 399 | /ix', |
| 400 | |
| 401 | // @import "xxx" |
| 402 | '/ |
| 403 | # import statement |
| 404 | @import |
| 405 | |
| 406 | # whitespace |
| 407 | \s+ |
| 408 | |
| 409 | # we don\'t have to check for @import url(), because the |
| 410 | # condition above will already catch these |
| 411 | |
| 412 | # open path enclosure |
| 413 | (?P<quotes>["\']) |
| 414 | |
| 415 | # fetch path |
| 416 | (?P<path>.+?) |
| 417 | |
| 418 | # close path enclosure |
| 419 | (?P=quotes) |
| 420 | |
| 421 | /ix', |
| 422 | ); |
| 423 | |
| 424 | // find all relative urls in css |
| 425 | $matches = array(); |
| 426 | foreach ($relativeRegexes as $relativeRegex) { |
| 427 | if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) { |
| 428 | $matches = array_merge($matches, $regexMatches); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | $search = array(); |
| 433 | $replace = array(); |
| 434 | |
| 435 | // loop all urls |
| 436 | foreach ($matches as $match) { |
| 437 | // determine if it's a url() or an @import match |
| 438 | $type = (strpos($match[0], '@import') === 0 ? 'import' : 'url'); |
| 439 | |
| 440 | $url = $match['path']; |
| 441 | if ($this->canImportByPath($url)) { |
| 442 | // attempting to interpret GET-params makes no sense, so let's discard them for awhile |
| 443 | $params = strrchr($url, '?'); |
| 444 | $url = $params ? substr($url, 0, -strlen($params)) : $url; |
| 445 | |
| 446 | // fix relative url |
| 447 | $url = $converter->convert($url); |
| 448 | |
| 449 | // now that the path has been converted, re-apply GET-params |
| 450 | $url .= $params; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Urls with control characters above 0x7e should be quoted. |
| 455 | * According to Mozilla's parser, whitespace is only allowed at the |
| 456 | * end of unquoted urls. |
| 457 | * Urls with `)` (as could happen with data: uris) should also be |
| 458 | * quoted to avoid being confused for the url() closing parentheses. |
| 459 | * And urls with a # have also been reported to cause issues. |
| 460 | * Urls with quotes inside should also remain escaped. |
| 461 | * |
| 462 | * @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation |
| 463 | * @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378 |
| 464 | * @see https://github.com/matthiasmullie/minify/issues/193 |
| 465 | */ |
| 466 | $url = trim($url); |
| 467 | if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) { |
| 468 | $url = $match['quotes'] . $url . $match['quotes']; |
| 469 | } |
| 470 | |
| 471 | // build replacement |
| 472 | $search[] = $match[0]; |
| 473 | if ($type === 'url') { |
| 474 | $replace[] = 'url(' . $url . ')'; |
| 475 | } elseif ($type === 'import') { |
| 476 | $replace[] = '@import "' . $url . '"'; |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | // replace urls |
| 481 | return str_replace($search, $replace, $content); |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * Shorthand HEX color codes. |
| 486 | * #FF0000FF -> #f00 -> red |
| 487 | * #FF00FF00 -> transparent. |
| 488 | * |
| 489 | * @param string $content The CSS content to shorten the HEX color codes for |
| 490 | * |
| 491 | * @return string |
| 492 | */ |
| 493 | protected function shortenHexColors($content) |
| 494 | { |
| 495 | // shorten repeating patterns within HEX .. |
| 496 | $content = preg_replace('/(?<=[: ])#([0-9a-f])\\1([0-9a-f])\\2([0-9a-f])\\3(?:([0-9a-f])\\4)?(?=[; }])/i', '#$1$2$3$4', $content); |
| 497 | |
| 498 | // remove alpha channel if it's pointless .. |
| 499 | $content = preg_replace('/(?<=[: ])#([0-9a-f]{6})ff(?=[; }])/i', '#$1', $content); |
| 500 | $content = preg_replace('/(?<=[: ])#([0-9a-f]{3})f(?=[; }])/i', '#$1', $content); |
| 501 | |
| 502 | // replace `transparent` with shortcut .. |
| 503 | $content = preg_replace('/(?<=[: ])#[0-9a-f]{6}00(?=[; }])/i', '#fff0', $content); |
| 504 | |
| 505 | $colors = array( |
| 506 | // make these more readable |
| 507 | '#00f' => 'blue', |
| 508 | '#dc143c' => 'crimson', |
| 509 | '#0ff' => 'cyan', |
| 510 | '#8b0000' => 'darkred', |
| 511 | '#696969' => 'dimgray', |
| 512 | '#ff69b4' => 'hotpink', |
| 513 | '#0f0' => 'lime', |
| 514 | '#fdf5e6' => 'oldlace', |
| 515 | '#87ceeb' => 'skyblue', |
| 516 | '#d8bfd8' => 'thistle', |
| 517 | // we can shorten some even more by replacing them with their color name |
| 518 | '#f0ffff' => 'azure', |
| 519 | '#f5f5dc' => 'beige', |
| 520 | '#ffe4c4' => 'bisque', |
| 521 | '#a52a2a' => 'brown', |
| 522 | '#ff7f50' => 'coral', |
| 523 | '#ffd700' => 'gold', |
| 524 | '#808080' => 'gray', |
| 525 | '#008000' => 'green', |
| 526 | '#4b0082' => 'indigo', |
| 527 | '#fffff0' => 'ivory', |
| 528 | '#f0e68c' => 'khaki', |
| 529 | '#faf0e6' => 'linen', |
| 530 | '#800000' => 'maroon', |
| 531 | '#000080' => 'navy', |
| 532 | '#808000' => 'olive', |
| 533 | '#ffa500' => 'orange', |
| 534 | '#da70d6' => 'orchid', |
| 535 | '#cd853f' => 'peru', |
| 536 | '#ffc0cb' => 'pink', |
| 537 | '#dda0dd' => 'plum', |
| 538 | '#800080' => 'purple', |
| 539 | '#f00' => 'red', |
| 540 | '#fa8072' => 'salmon', |
| 541 | '#a0522d' => 'sienna', |
| 542 | '#c0c0c0' => 'silver', |
| 543 | '#fffafa' => 'snow', |
| 544 | '#d2b48c' => 'tan', |
| 545 | '#008080' => 'teal', |
| 546 | '#ff6347' => 'tomato', |
| 547 | '#ee82ee' => 'violet', |
| 548 | '#f5deb3' => 'wheat', |
| 549 | // or the other way around |
| 550 | 'black' => '#000', |
| 551 | 'fuchsia' => '#f0f', |
| 552 | 'magenta' => '#f0f', |
| 553 | 'white' => '#fff', |
| 554 | 'yellow' => '#ff0', |
| 555 | // and also `transparent` |
| 556 | 'transparent' => '#fff0', |
| 557 | ); |
| 558 | |
| 559 | return preg_replace_callback( |
| 560 | '/(?<=[: ])(' . implode('|', array_keys($colors)) . ')(?=[; }])/i', |
| 561 | function ($match) use ($colors) { |
| 562 | return $colors[strtolower($match[0])]; |
| 563 | }, |
| 564 | $content |
| 565 | ); |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * Convert RGB|HSL color codes. |
| 570 | * rgb(255,0,0,.5) -> rgb(255 0 0 / .5). |
| 571 | * rgb(255,0,0) -> #f00. |
| 572 | * |
| 573 | * @param string $content The CSS content to shorten the RGB color codes for |
| 574 | * |
| 575 | * @return string |
| 576 | */ |
| 577 | protected function convertLegacyColors($content) |
| 578 | { |
| 579 | /* |
| 580 | https://drafts.csswg.org/css-color/#color-syntax-legacy |
| 581 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgb |
| 582 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hsl |
| 583 | */ |
| 584 | |
| 585 | // convert legacy color syntax |
| 586 | $content = preg_replace('/(rgb)a?\(\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0,1]?(?:\.[0-9]*)?)\s*\)/i', '$1($2 $3 $4 / $5)', $content); |
| 587 | $content = preg_replace('/(rgb)a?\(\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*\)/i', '$1($2 $3 $4)', $content); |
| 588 | $content = preg_replace('/(hsl)a?\(\s*([0-9]+(?:deg|grad|rad|turn)?)\s*,\s*([0-9]{1,3}%)\s*,\s*([0-9]{1,3}%)\s*,\s*([0,1]?(?:\.[0-9]*)?)\s*\)/i', '$1($2 $3 $4 / $5)', $content); |
| 589 | $content = preg_replace('/(hsl)a?\(\s*([0-9]+(?:deg|grad|rad|turn)?)\s*,\s*([0-9]{1,3}%)\s*,\s*([0-9]{1,3}%)\s*\)/i', '$1($2 $3 $4)', $content); |
| 590 | |
| 591 | // convert `rgb` to `hex` |
| 592 | $dec = '([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])'; |
| 593 | return preg_replace_callback( |
| 594 | "/rgb\($dec $dec $dec\)/i", |
| 595 | function ($match) { |
| 596 | return sprintf('#%02x%02x%02x', $match[1], $match[2], $match[3]); |
| 597 | }, |
| 598 | $content |
| 599 | ); |
| 600 | } |
| 601 | |
| 602 | /** |
| 603 | * Cleanup RGB|HSL|HWB|LCH|LAB |
| 604 | * rgb(255 0 0 / 1) -> rgb(255 0 0). |
| 605 | * rgb(255 0 0 / 0) -> transparent. |
| 606 | * |
| 607 | * @param string $content The CSS content to cleanup HSL|HWB|LCH|LAB |
| 608 | * |
| 609 | * @return string |
| 610 | */ |
| 611 | protected function cleanupModernColors($content) |
| 612 | { |
| 613 | /* |
| 614 | https://drafts.csswg.org/css-color/#color-syntax-modern |
| 615 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hwb |
| 616 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lch |
| 617 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lab |
| 618 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/oklch |
| 619 | https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/oklab |
| 620 | */ |
| 621 | $tag = '(rgb|hsl|hwb|(?:(?:ok)?(?:lch|lab)))'; |
| 622 | |
| 623 | // remove alpha channel if it's pointless .. |
| 624 | $content = preg_replace('/' . $tag . '\(\s*([^\s]+)\s+([^\s]+)\s+([^\s]+)\s+\/\s+1(?:(?:\.\d?)*|00%)?\s*\)/i', '$1($2 $3 $4)', $content); |
| 625 | |
| 626 | // replace `transparent` with shortcut .. |
| 627 | $content = preg_replace('/' . $tag . '\(\s*[^\s]+\s+[^\s]+\s+[^\s]+\s+\/\s+0(?:[\.0%]*)?\s*\)/i', '#fff0', $content); |
| 628 | |
| 629 | return $content; |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * Shorten CSS font weights. |
| 634 | * |
| 635 | * @param string $content The CSS content to shorten the font weights for |
| 636 | * |
| 637 | * @return string |
| 638 | */ |
| 639 | protected function shortenFontWeights($content) |
| 640 | { |
| 641 | $weights = array( |
| 642 | 'normal' => 400, |
| 643 | 'bold' => 700, |
| 644 | ); |
| 645 | |
| 646 | $callback = function ($match) use ($weights) { |
| 647 | return $match[1] . $weights[$match[2]]; |
| 648 | }; |
| 649 | |
| 650 | return preg_replace_callback('/(font-weight\s*:\s*)(' . implode('|', array_keys($weights)) . ')(?=[;}])/', $callback, $content); |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Shorthand 0 values to plain 0, instead of e.g. -0em. |
| 655 | * |
| 656 | * @param string $content The CSS content to shorten the zero values for |
| 657 | * |
| 658 | * @return string |
| 659 | */ |
| 660 | protected function shortenZeroes($content) |
| 661 | { |
| 662 | // we don't want to strip units in `calc()` expressions: |
| 663 | // `5px - 0px` is valid, but `5px - 0` is not |
| 664 | // `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but |
| 665 | // `10 * 0` is invalid |
| 666 | // we've extracted calcs earlier, so we don't need to worry about this |
| 667 | |
| 668 | // reusable bits of code throughout these regexes: |
| 669 | // before & after are used to make sure we don't match lose unintended |
| 670 | // 0-like values (e.g. in #000, or in http://url/1.0) |
| 671 | // units can be stripped from 0 values, or used to recognize non 0 |
| 672 | // values (where wa may be able to strip a .0 suffix) |
| 673 | $before = '(?<=[:(, ])'; |
| 674 | $after = '(?=[ ,);}])'; |
| 675 | $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)'; |
| 676 | |
| 677 | // strip units after zeroes (0px -> 0) |
| 678 | // NOTE: it should be safe to remove all units for a 0 value, but in |
| 679 | // practice, Webkit (especially Safari) seems to stumble over at least |
| 680 | // 0%, potentially other units as well. Only stripping 'px' for now. |
| 681 | // @see https://github.com/matthiasmullie/minify/issues/60 |
| 682 | $content = preg_replace('/' . $before . '(-?0*(\.0+)?)(?<=0)px' . $after . '/', '\\1', $content); |
| 683 | |
| 684 | // strip 0-digits (.0 -> 0) |
| 685 | $content = preg_replace('/' . $before . '\.0+' . $units . '?' . $after . '/', '0\\1', $content); |
| 686 | // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px |
| 687 | $content = preg_replace('/' . $before . '(-?[0-9]+\.[0-9]+)0+' . $units . '?' . $after . '/', '\\1\\2', $content); |
| 688 | // strip trailing 0: 50.00 -> 50, 50.00px -> 50px |
| 689 | $content = preg_replace('/' . $before . '(-?[0-9]+)\.0+' . $units . '?' . $after . '/', '\\1\\2', $content); |
| 690 | // strip leading 0: 0.1 -> .1, 01.1 -> 1.1 |
| 691 | $content = preg_replace('/' . $before . '(-?)0+([0-9]*\.[0-9]+)' . $units . '?' . $after . '/', '\\1\\2\\3', $content); |
| 692 | |
| 693 | // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0) |
| 694 | $content = preg_replace('/' . $before . '-?0+' . $units . '?' . $after . '/', '0\\1', $content); |
| 695 | |
| 696 | // IE doesn't seem to understand a unitless flex-basis value (correct - |
| 697 | // it goes against the spec), so let's add it in again (make it `%`, |
| 698 | // which is only 1 char: 0%, 0px, 0 anything, it's all just the same) |
| 699 | // @see https://developer.mozilla.org/nl/docs/Web/CSS/flex |
| 700 | $content = preg_replace('/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content); |
| 701 | $content = preg_replace('/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content); |
| 702 | |
| 703 | return $content; |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * Strip empty tags from source code. |
| 708 | * |
| 709 | * @param string $content |
| 710 | * |
| 711 | * @return string |
| 712 | */ |
| 713 | protected function stripEmptyTags($content) |
| 714 | { |
| 715 | $content = preg_replace('/(?<=^)[^\{\};]+\{\s*\}/', '', $content); |
| 716 | $content = preg_replace('/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content); |
| 717 | |
| 718 | return $content; |
| 719 | } |
| 720 | |
| 721 | /** |
| 722 | * Strip comments from source code. |
| 723 | */ |
| 724 | protected function stripComments() |
| 725 | { |
| 726 | $this->stripMultilineComments(); |
| 727 | } |
| 728 | |
| 729 | /** |
| 730 | * Strip whitespace. |
| 731 | * |
| 732 | * @param string $content The CSS content to strip the whitespace for |
| 733 | * |
| 734 | * @return string |
| 735 | */ |
| 736 | protected function stripWhitespace($content) |
| 737 | { |
| 738 | // remove leading & trailing whitespace |
| 739 | $content = preg_replace('/^\s*/m', '', $content); |
| 740 | $content = preg_replace('/\s*$/m', '', $content); |
| 741 | |
| 742 | // replace newlines with a single space |
| 743 | $content = preg_replace('/\s+/', ' ', $content); |
| 744 | |
| 745 | // remove whitespace around meta characters |
| 746 | // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex |
| 747 | $content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content); |
| 748 | $content = preg_replace('/([\[(:>\+])\s+/', '$1', $content); |
| 749 | $content = preg_replace('/\s+([\]\)>\+])/', '$1', $content); |
| 750 | $content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content); |
| 751 | |
| 752 | // whitespace around + and - can only be stripped inside some pseudo- |
| 753 | // classes, like `:nth-child(3+2n)` |
| 754 | // not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or |
| 755 | // selectors like `div.weird- p` |
| 756 | $pseudos = array('nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type'); |
| 757 | $content = preg_replace('/:(' . implode('|', $pseudos) . ')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content); |
| 758 | |
| 759 | // remove semicolon/whitespace followed by closing bracket |
| 760 | $content = str_replace(';}', '}', $content); |
| 761 | |
| 762 | return trim($content); |
| 763 | } |
| 764 | |
| 765 | /** |
| 766 | * Replace all occurrences of functions that may contain math, where |
| 767 | * whitespace around operators needs to be preserved (e.g. calc, clamp). |
| 768 | */ |
| 769 | protected function extractMath() |
| 770 | { |
| 771 | $functions = array('calc', 'clamp', 'min', 'max'); |
| 772 | $pattern = '/\b(' . implode('|', $functions) . ')(\(.+?)(?=$|;|})/m'; |
| 773 | |
| 774 | // PHP only supports $this inside anonymous functions since 5.4 |
| 775 | $minifier = $this; |
| 776 | $callback = function ($match) use ($minifier, $pattern, &$callback) { |
| 777 | $function = $match[1]; |
| 778 | $length = strlen($match[2]); |
| 779 | $expr = ''; |
| 780 | $opened = 0; |
| 781 | |
| 782 | // the regular expression for extracting math has 1 significant problem: |
| 783 | // it can't determine the correct closing parenthesis... |
| 784 | // instead, it'll match a larger portion of code to where it's certain that |
| 785 | // the calc() musts have ended, and we'll figure out which is the correct |
| 786 | // closing parenthesis here, by counting how many have opened |
| 787 | for ($i = 0; $i < $length; ++$i) { |
| 788 | $char = $match[2][$i]; |
| 789 | $expr .= $char; |
| 790 | if ($char === '(') { |
| 791 | ++$opened; |
| 792 | } elseif ($char === ')' && --$opened === 0) { |
| 793 | break; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | // now that we've figured out where the calc() starts and ends, extract it |
| 798 | $count = count($minifier->extracted); |
| 799 | $placeholder = 'math(' . $count . ')'; |
| 800 | $minifier->extracted[$placeholder] = $function . '(' . trim(substr($expr, 1, -1)) . ')'; |
| 801 | |
| 802 | // and since we've captured more code than required, we may have some leftover |
| 803 | // calc() in here too - go recursive on the remaining but of code to go figure |
| 804 | // that out and extract what is needed |
| 805 | $rest = $minifier->str_replace_first($function . $expr, '', $match[0]); |
| 806 | $rest = preg_replace_callback($pattern, $callback, $rest); |
| 807 | |
| 808 | return $placeholder . $rest; |
| 809 | }; |
| 810 | |
| 811 | $this->registerPattern($pattern, $callback); |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * Replace custom properties, whose values may be used in scenarios where |
| 816 | * we wouldn't want them to be minified (e.g. inside calc). |
| 817 | */ |
| 818 | protected function extractCustomProperties() |
| 819 | { |
| 820 | // PHP only supports $this inside anonymous functions since 5.4 |
| 821 | $minifier = $this; |
| 822 | $this->registerPattern( |
| 823 | '/(?<=^|[;}{])\s*(--[^:;{}"\'\s]+)\s*:([^;{}]+)/m', |
| 824 | function ($match) use ($minifier) { |
| 825 | $placeholder = '--custom-' . count($minifier->extracted) . ':0'; |
| 826 | $minifier->extracted[$placeholder] = $match[1] . ':' . trim($match[2]); |
| 827 | |
| 828 | return $placeholder; |
| 829 | } |
| 830 | ); |
| 831 | } |
| 832 | |
| 833 | /** |
| 834 | * Check if file is small enough to be imported. |
| 835 | * |
| 836 | * @param string $path The path to the file |
| 837 | * |
| 838 | * @return bool |
| 839 | */ |
| 840 | protected function canImportBySize($path) |
| 841 | { |
| 842 | return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024; |
| 843 | } |
| 844 | |
| 845 | /** |
| 846 | * Check if file a file can be imported, going by the path. |
| 847 | * |
| 848 | * @param string $path |
| 849 | * |
| 850 | * @return bool |
| 851 | */ |
| 852 | protected function canImportByPath($path) |
| 853 | { |
| 854 | return preg_match('/^(data:|https?:|\\/)/', $path) === 0; |
| 855 | } |
| 856 | |
| 857 | /** |
| 858 | * Return a converter to update relative paths to be relative to the new |
| 859 | * destination. |
| 860 | * |
| 861 | * @param string $source |
| 862 | * @param string $target |
| 863 | * |
| 864 | * @return ConverterInterface |
| 865 | */ |
| 866 | protected function getPathConverter($source, $target) |
| 867 | { |
| 868 | return new Converter($source, $target); |
| 869 | } |
| 870 | } |
| 871 |