1<?php 2 3/*! 4 * cssmin.php v2.4.8-4 5 * Author: Tubal Martin - http://tubalmartin.me/ 6 * Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port 7 * 8 * This is a PHP port of the CSS minification tool distributed with YUICompressor, 9 * itself a port of the cssmin utility by Isaac Schlueter - http://foohack.com/ 10 * Permission is hereby granted to use the PHP version under the same 11 * conditions as the YUICompressor. 12 */ 13 14/*! 15 * YUI Compressor 16 * http://developer.yahoo.com/yui/compressor/ 17 * Author: Julien Lecomte - http://www.julienlecomte.net/ 18 * Copyright (c) 2013 Yahoo! Inc. All rights reserved. 19 * The copyrights embodied in the content of this file are licensed 20 * by Yahoo! Inc. under the BSD (revised) open source license. 21 */ 22 23class CSSmin 24{ 25 const NL = '___YUICSSMIN_PRESERVED_NL___'; 26 const TOKEN = '___YUICSSMIN_PRESERVED_TOKEN_'; 27 const COMMENT = '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_'; 28 const CLASSCOLON = '___YUICSSMIN_PSEUDOCLASSCOLON___'; 29 const QUERY_FRACTION = '___YUICSSMIN_QUERY_FRACTION___'; 30 31 private $comments; 32 private $preserved_tokens; 33 private $memory_limit; 34 private $max_execution_time; 35 private $pcre_backtrack_limit; 36 private $pcre_recursion_limit; 37 private $raise_php_limits; 38 39 /** 40 * @param bool|int $raise_php_limits 41 * If true, PHP settings will be raised if needed 42 */ 43 public function __construct($raise_php_limits = TRUE) 44 { 45 // Set suggested PHP limits 46 $this->memory_limit = 128 * 1048576; // 128MB in bytes 47 $this->max_execution_time = 60; // 1 min 48 $this->pcre_backtrack_limit = 1000 * 1000; 49 $this->pcre_recursion_limit = 500 * 1000; 50 51 $this->raise_php_limits = (bool) $raise_php_limits; 52 } 53 54 /** 55 * Minify a string of CSS 56 * @param string $css 57 * @param int|bool $linebreak_pos 58 * @return string 59 */ 60 public function run($css = '', $linebreak_pos = FALSE) 61 { 62 if (empty($css)) { 63 return ''; 64 } 65 66 if ($this->raise_php_limits) { 67 $this->do_raise_php_limits(); 68 } 69 70 $this->comments = array(); 71 $this->preserved_tokens = array(); 72 73 $start_index = 0; 74 $length = strlen($css); 75 76 $css = $this->extract_data_urls($css); 77 78 // collect all comment blocks... 79 while (($start_index = $this->index_of($css, '/*', $start_index)) >= 0) { 80 $end_index = $this->index_of($css, '*/', $start_index + 2); 81 if ($end_index < 0) { 82 $end_index = $length; 83 } 84 $comment_found = $this->str_slice($css, $start_index + 2, $end_index); 85 $this->comments[] = $comment_found; 86 $comment_preserve_string = self::COMMENT . (count($this->comments) - 1) . '___'; 87 $css = $this->str_slice($css, 0, $start_index + 2) . $comment_preserve_string . $this->str_slice($css, $end_index); 88 // Set correct start_index: Fixes issue #2528130 89 $start_index = $end_index + 2 + strlen($comment_preserve_string) - strlen($comment_found); 90 } 91 92 // preserve strings so their content doesn't get accidentally minified 93 $css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/S", array($this, 'replace_string'), $css); 94 95 // Let's divide css code in chunks of 5.000 chars aprox. 96 // Reason: PHP's PCRE functions like preg_replace have a "backtrack limit" 97 // of 100.000 chars by default (php < 5.3.7) so if we're dealing with really 98 // long strings and a (sub)pattern matches a number of chars greater than 99 // the backtrack limit number (i.e. /(.*)/s) PCRE functions may fail silently 100 // returning NULL and $css would be empty. 101 $charset = ''; 102 $charset_regexp = '/(@charset)( [^;]+;)/i'; 103 $css_chunks = array(); 104 $css_chunk_length = 5000; // aprox size, not exact 105 $start_index = 0; 106 $i = $css_chunk_length; // save initial iterations 107 $l = strlen($css); 108 109 110 // if the number of characters is 5000 or less, do not chunk 111 if ($l <= $css_chunk_length) { 112 $css_chunks[] = $css; 113 } else { 114 // chunk css code securely 115 while ($i < $l) { 116 $i += 50; // save iterations 117 if ($l - $start_index <= $css_chunk_length || $i >= $l) { 118 $css_chunks[] = $this->str_slice($css, $start_index); 119 break; 120 } 121 if ($css[$i - 1] === '}' && $i - $start_index > $css_chunk_length) { 122 // If there are two ending curly braces }} separated or not by spaces, 123 // join them in the same chunk (i.e. @media blocks) 124 $next_chunk = substr($css, $i); 125 if (preg_match('/^\s*\}/', $next_chunk)) { 126 $i = $i + $this->index_of($next_chunk, '}') + 1; 127 } 128 129 $css_chunks[] = $this->str_slice($css, $start_index, $i); 130 $start_index = $i; 131 } 132 } 133 } 134 135 // Minify each chunk 136 for ($i = 0, $n = count($css_chunks); $i < $n; $i++) { 137 $css_chunks[$i] = $this->minify($css_chunks[$i], $linebreak_pos); 138 // Keep the first @charset at-rule found 139 if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) { 140 $charset = strtolower($matches[1]) . $matches[2]; 141 } 142 // Delete all @charset at-rules 143 $css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]); 144 } 145 146 // Update the first chunk and push the charset to the top of the file. 147 $css_chunks[0] = $charset . $css_chunks[0]; 148 149 return implode('', $css_chunks); 150 } 151 152 /** 153 * Sets the memory limit for this script 154 * @param int|string $limit 155 */ 156 public function set_memory_limit($limit) 157 { 158 $this->memory_limit = $this->normalize_int($limit); 159 } 160 161 /** 162 * Sets the maximum execution time for this script 163 * @param int|string $seconds 164 */ 165 public function set_max_execution_time($seconds) 166 { 167 $this->max_execution_time = (int) $seconds; 168 } 169 170 /** 171 * Sets the PCRE backtrack limit for this script 172 * @param int $limit 173 */ 174 public function set_pcre_backtrack_limit($limit) 175 { 176 $this->pcre_backtrack_limit = (int) $limit; 177 } 178 179 /** 180 * Sets the PCRE recursion limit for this script 181 * @param int $limit 182 */ 183 public function set_pcre_recursion_limit($limit) 184 { 185 $this->pcre_recursion_limit = (int) $limit; 186 } 187 188 /** 189 * Try to configure PHP to use at least the suggested minimum settings 190 */ 191 private function do_raise_php_limits() 192 { 193 $php_limits = array( 194 'memory_limit' => $this->memory_limit, 195 'max_execution_time' => $this->max_execution_time, 196 'pcre.backtrack_limit' => $this->pcre_backtrack_limit, 197 'pcre.recursion_limit' => $this->pcre_recursion_limit 198 ); 199 200 // If current settings are higher respect them. 201 foreach ($php_limits as $name => $suggested) { 202 $current = $this->normalize_int(ini_get($name)); 203 // memory_limit exception: allow -1 for "no memory limit". 204 if ($current > -1 && ($suggested == -1 || $current < $suggested)) { 205 ini_set($name, $suggested); 206 } 207 } 208 } 209 210 /** 211 * Does bulk of the minification 212 * @param string $css 213 * @param int|bool $linebreak_pos 214 * @return string 215 */ 216 private function minify($css, $linebreak_pos) 217 { 218 // strings are safe, now wrestle the comments 219 for ($i = 0, $max = count($this->comments); $i < $max; $i++) { 220 221 $token = $this->comments[$i]; 222 $placeholder = '/' . self::COMMENT . $i . '___/'; 223 224 // ! in the first position of the comment means preserve 225 // so push to the preserved tokens keeping the ! 226 if (substr($token, 0, 1) === '!') { 227 $this->preserved_tokens[] = $token; 228 $token_tring = self::TOKEN . (count($this->preserved_tokens) - 1) . '___'; 229 $css = preg_replace($placeholder, $token_tring, $css, 1); 230 // Preserve new lines for /*! important comments 231 $css = preg_replace('/\s*[\n\r\f]+\s*(\/\*'. $token_tring .')/S', self::NL.'$1', $css); 232 $css = preg_replace('/('. $token_tring .'\*\/)\s*[\n\r\f]+\s*/', '$1'.self::NL, $css); 233 continue; 234 } 235 236 // \ in the last position looks like hack for Mac/IE5 237 // shorten that to /*\*/ and the next one to /**/ 238 if (substr($token, (strlen($token) - 1), 1) === '\\') { 239 $this->preserved_tokens[] = '\\'; 240 $css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); 241 $i = $i + 1; // attn: advancing the loop 242 $this->preserved_tokens[] = ''; 243 $css = preg_replace('/' . self::COMMENT . $i . '___/', self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); 244 continue; 245 } 246 247 // keep empty comments after child selectors (IE7 hack) 248 // e.g. html >/**/ body 249 if (strlen($token) === 0) { 250 $start_index = $this->index_of($css, $this->str_slice($placeholder, 1, -1)); 251 if ($start_index > 2) { 252 if (substr($css, $start_index - 3, 1) === '>') { 253 $this->preserved_tokens[] = ''; 254 $css = preg_replace($placeholder, self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1); 255 } 256 } 257 } 258 259 // in all other cases kill the comment 260 $css = preg_replace('/\/\*' . $this->str_slice($placeholder, 1, -1) . '\*\//', '', $css, 1); 261 } 262 263 264 // Normalize all whitespace strings to single spaces. Easier to work with that way. 265 $css = preg_replace('/\s+/', ' ', $css); 266 267 // Fix IE7 issue on matrix filters which browser accept whitespaces between Matrix parameters 268 $css = preg_replace_callback('/\s*filter\:\s*progid:DXImageTransform\.Microsoft\.Matrix\(([^\)]+)\)/', array($this, 'preserve_old_IE_specific_matrix_definition'), $css); 269 270 // Shorten & preserve calculations calc(...) since spaces are important 271 $css = preg_replace_callback('/calc(\(((?:[^\(\)]+|(?1))*)\))/i', array($this, 'replace_calc'), $css); 272 273 // Replace positive sign from numbers preceded by : or a white-space before the leading space is removed 274 // +1.2em to 1.2em, +.8px to .8px, +2% to 2% 275 $css = preg_replace('/((?<!\\\\)\:|\s)\+(\.?\d+)/S', '$1$2', $css); 276 277 // Remove leading zeros from integer and float numbers preceded by : or a white-space 278 // 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05 279 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?)0+(\.?\d+)/S', '$1$2$3', $css); 280 281 // Remove trailing zeros from float numbers preceded by : or a white-space 282 // -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px 283 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?)(\d?\.\d+?)0+([^\d])/S', '$1$2$3$4', $css); 284 285 // Remove trailing .0 -> -9.0 to -9 286 $css = preg_replace('/((?<!\\\\)\:|\s)(\-?\d+)\.0([^\d])/S', '$1$2$3', $css); 287 288 // Replace 0 length numbers with 0 289 $css = preg_replace('/((?<!\\\\)\:|\s)\-?\.?0+([^\d])/S', '${1}0$2', $css); 290 291 // Remove the spaces before the things that should not have spaces before them. 292 // But, be careful not to turn "p :link {...}" into "p:link{...}" 293 // Swap out any pseudo-class colons with the token, and then swap back. 294 $css = preg_replace_callback('/(?:^|\})[^\{]*\s+\:/', array($this, 'replace_colon'), $css); 295 296 // Remove spaces before the things that should not have spaces before them. 297 $css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\]\~\=,])/', '$1', $css); 298 299 // Restore spaces for !important 300 $css = preg_replace('/\!important/i', ' !important', $css); 301 302 // bring back the colon 303 $css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css); 304 305 // retain space for special IE6 cases 306 $css = preg_replace_callback('/\:first\-(line|letter)(\{|,)/i', array($this, 'lowercase_pseudo_first'), $css); 307 308 // no space after the end of a preserved comment 309 $css = preg_replace('/\*\/ /', '*/', $css); 310 311 // lowercase some popular @directives 312 $css = preg_replace_callback('/@(font-face|import|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?keyframe|media|page|namespace)/i', array($this, 'lowercase_directives'), $css); 313 314 // lowercase some more common pseudo-elements 315 $css = preg_replace_callback('/:(active|after|before|checked|disabled|empty|enabled|first-(?:child|of-type)|focus|hover|last-(?:child|of-type)|link|only-(?:child|of-type)|root|:selection|target|visited)/i', array($this, 'lowercase_pseudo_elements'), $css); 316 317 // lowercase some more common functions 318 $css = preg_replace_callback('/:(lang|not|nth-child|nth-last-child|nth-last-of-type|nth-of-type|(?:-(?:moz|webkit)-)?any)\(/i', array($this, 'lowercase_common_functions'), $css); 319 320 // lower case some common function that can be values 321 // NOTE: rgb() isn't useful as we replace with #hex later, as well as and() is already done for us 322 $css = preg_replace_callback('/([:,\( ]\s*)(attr|color-stop|from|rgba|to|url|(?:-(?:atsc|khtml|moz|ms|o|wap|webkit)-)?(?:calc|max|min|(?:repeating-)?(?:linear|radial)-gradient)|-webkit-gradient)/iS', array($this, 'lowercase_common_functions_values'), $css); 323 324 // Put the space back in some cases, to support stuff like 325 // @media screen and (-webkit-min-device-pixel-ratio:0){ 326 $css = preg_replace('/\band\(/i', 'and (', $css); 327 328 // Remove the spaces after the things that should not have spaces after them. 329 $css = preg_replace('/([\!\{\}\:;\>\+\(\[\~\=,])\s+/S', '$1', $css); 330 331 // remove unnecessary semicolons 332 $css = preg_replace('/;+\}/', '}', $css); 333 334 // Fix for issue: #2528146 335 // Restore semicolon if the last property is prefixed with a `*` (lte IE7 hack) 336 // to avoid issues on Symbian S60 3.x browsers. 337 $css = preg_replace('/(\*[a-z0-9\-]+\s*\:[^;\}]+)(\})/', '$1;$2', $css); 338 339 // Replace 0 <length> and 0 <percentage> values with 0. 340 // <length> data type: https://developer.mozilla.org/en-US/docs/Web/CSS/length 341 // <percentage> data type: https://developer.mozilla.org/en-US/docs/Web/CSS/percentage 342 $css = preg_replace('/([^\\\\]\:|\s)0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%)/iS', '${1}0', $css); 343 344 // 0% step in a keyframe? restore the % unit 345 $css = preg_replace_callback('/(@[a-z\-]*?keyframes[^\{]+\{)(.*?)(\}\})/iS', array($this, 'replace_keyframe_zero'), $css); 346 347 // Replace 0 0; or 0 0 0; or 0 0 0 0; with 0. 348 $css = preg_replace('/\:0(?: 0){1,3}(;|\}| \!)/', ':0$1', $css); 349 350 // Fix for issue: #2528142 351 // Replace text-shadow:0; with text-shadow:0 0 0; 352 $css = preg_replace('/(text-shadow\:0)(;|\}| \!)/i', '$1 0 0$2', $css); 353 354 // Replace background-position:0; with background-position:0 0; 355 // same for transform-origin 356 // Changing -webkit-mask-position: 0 0 to just a single 0 will result in the second parameter defaulting to 50% (center) 357 $css = preg_replace('/(background\-position|webkit-mask-position|(?:webkit|moz|o|ms|)\-?transform\-origin)\:0(;|\}| \!)/iS', '$1:0 0$2', $css); 358 359 // Shorten colors from rgb(51,102,153) to #336699, rgb(100%,0%,0%) to #ff0000 (sRGB color space) 360 // Shorten colors from hsl(0, 100%, 50%) to #ff0000 (sRGB color space) 361 // This makes it more likely that it'll get further compressed in the next step. 362 $css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'rgb_to_hex'), $css); 363 $css = preg_replace_callback('/hsl\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'hsl_to_hex'), $css); 364 365 // Shorten colors from #AABBCC to #ABC or short color name. 366 $css = $this->compress_hex_colors($css); 367 368 // border: none to border:0, outline: none to outline:0 369 $css = preg_replace('/(border\-?(?:top|right|bottom|left|)|outline)\:none(;|\}| \!)/iS', '$1:0$2', $css); 370 371 // shorter opacity IE filter 372 $css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css); 373 374 // Find a fraction that is used for Opera's -o-device-pixel-ratio query 375 // Add token to add the "\" back in later 376 $css = preg_replace('/\(([a-z\-]+):([0-9]+)\/([0-9]+)\)/i', '($1:$2'. self::QUERY_FRACTION .'$3)', $css); 377 378 // Remove empty rules. 379 $css = preg_replace('/[^\};\{\/]+\{\}/S', '', $css); 380 381 // Add "/" back to fix Opera -o-device-pixel-ratio query 382 $css = preg_replace('/'. self::QUERY_FRACTION .'/', '/', $css); 383 384 // Replace multiple semi-colons in a row by a single one 385 // See SF bug #1980989 386 $css = preg_replace('/;;+/', ';', $css); 387 388 // Restore new lines for /*! important comments 389 $css = preg_replace('/'. self::NL .'/', "\n", $css); 390 391 // Lowercase all uppercase properties 392 $css = preg_replace_callback('/(\{|\;)([A-Z\-]+)(\:)/', array($this, 'lowercase_properties'), $css); 393 394 // Some source control tools don't like it when files containing lines longer 395 // than, say 8000 characters, are checked in. The linebreak option is used in 396 // that case to split long lines after a specific column. 397 if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) { 398 $linebreak_pos = (int) $linebreak_pos; 399 $start_index = $i = 0; 400 while ($i < strlen($css)) { 401 $i++; 402 if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) { 403 $css = $this->str_slice($css, 0, $i) . "\n" . $this->str_slice($css, $i); 404 $start_index = $i; 405 } 406 } 407 } 408 409 // restore preserved comments and strings in reverse order 410 for ($i = count($this->preserved_tokens) - 1; $i >= 0; $i--) { 411 $css = preg_replace('/' . self::TOKEN . $i . '___/', $this->preserved_tokens[$i], $css, 1); 412 } 413 414 // Trim the final string (for any leading or trailing white spaces) 415 return trim($css); 416 } 417 418 /** 419 * Utility method to replace all data urls with tokens before we start 420 * compressing, to avoid performance issues running some of the subsequent 421 * regexes against large strings chunks. 422 * 423 * @param string $css 424 * @return string 425 */ 426 private function extract_data_urls($css) 427 { 428 // Leave data urls alone to increase parse performance. 429 $max_index = strlen($css) - 1; 430 $append_index = $index = $last_index = $offset = 0; 431 $sb = array(); 432 $pattern = '/url\(\s*(["\']?)data\:/i'; 433 434 // Since we need to account for non-base64 data urls, we need to handle 435 // ' and ) being part of the data string. Hence switching to indexOf, 436 // to determine whether or not we have matching string terminators and 437 // handling sb appends directly, instead of using matcher.append* methods. 438 439 while (preg_match($pattern, $css, $m, 0, $offset)) { 440 $index = $this->index_of($css, $m[0], $offset); 441 $last_index = $index + strlen($m[0]); 442 $start_index = $index + 4; // "url(".length() 443 $end_index = $last_index - 1; 444 $terminator = $m[1]; // ', " or empty (not quoted) 445 $found_terminator = FALSE; 446 447 if (strlen($terminator) === 0) { 448 $terminator = ')'; 449 } 450 451 while ($found_terminator === FALSE && $end_index+1 <= $max_index) { 452 $end_index = $this->index_of($css, $terminator, $end_index + 1); 453 454 // endIndex == 0 doesn't really apply here 455 if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') { 456 $found_terminator = TRUE; 457 if (')' != $terminator) { 458 $end_index = $this->index_of($css, ')', $end_index); 459 } 460 } 461 } 462 463 // Enough searching, start moving stuff over to the buffer 464 $sb[] = $this->str_slice($css, $append_index, $index); 465 466 if ($found_terminator) { 467 $token = $this->str_slice($css, $start_index, $end_index); 468 $token = preg_replace('/\s+/', '', $token); 469 $this->preserved_tokens[] = $token; 470 471 $preserver = 'url(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___)'; 472 $sb[] = $preserver; 473 474 $append_index = $end_index + 1; 475 } else { 476 // No end terminator found, re-add the whole match. Should we throw/warn here? 477 $sb[] = $this->str_slice($css, $index, $last_index); 478 $append_index = $last_index; 479 } 480 481 $offset = $last_index; 482 } 483 484 $sb[] = $this->str_slice($css, $append_index); 485 486 return implode('', $sb); 487 } 488 489 /** 490 * Utility method to compress hex color values of the form #AABBCC to #ABC or short color name. 491 * 492 * DOES NOT compress CSS ID selectors which match the above pattern (which would break things). 493 * e.g. #AddressForm { ... } 494 * 495 * DOES NOT compress IE filters, which have hex color values (which would break things). 496 * e.g. filter: chroma(color="#FFFFFF"); 497 * 498 * DOES NOT compress invalid hex values. 499 * e.g. background-color: #aabbccdd 500 * 501 * @param string $css 502 * @return string 503 */ 504 private function compress_hex_colors($css) 505 { 506 // Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters) 507 $pattern = '/(\=\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/iS'; 508 $_index = $index = $last_index = $offset = 0; 509 $sb = array(); 510 // See: http://ajaxmin.codeplex.com/wikipage?title=CSS%20Colors 511 $short_safe = array( 512 '#808080' => 'gray', 513 '#008000' => 'green', 514 '#800000' => 'maroon', 515 '#000080' => 'navy', 516 '#808000' => 'olive', 517 '#ffa500' => 'orange', 518 '#800080' => 'purple', 519 '#c0c0c0' => 'silver', 520 '#008080' => 'teal', 521 '#f00' => 'red' 522 ); 523 524 while (preg_match($pattern, $css, $m, 0, $offset)) { 525 $index = $this->index_of($css, $m[0], $offset); 526 $last_index = $index + strlen($m[0]); 527 $is_filter = $m[1] !== null && $m[1] !== ''; 528 529 $sb[] = $this->str_slice($css, $_index, $index); 530 531 if ($is_filter) { 532 // Restore, maintain case, otherwise filter will break 533 $sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]; 534 } else { 535 if (strtolower($m[2]) == strtolower($m[3]) && 536 strtolower($m[4]) == strtolower($m[5]) && 537 strtolower($m[6]) == strtolower($m[7])) { 538 // Compress. 539 $hex = '#' . strtolower($m[3] . $m[5] . $m[7]); 540 } else { 541 // Non compressible color, restore but lower case. 542 $hex = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]); 543 } 544 // replace Hex colors to short safe color names 545 $sb[] = array_key_exists($hex, $short_safe) ? $short_safe[$hex] : $hex; 546 } 547 548 $_index = $offset = $last_index - strlen($m[8]); 549 } 550 551 $sb[] = $this->str_slice($css, $_index); 552 553 return implode('', $sb); 554 } 555 556 /* CALLBACKS 557 * --------------------------------------------------------------------------------------------- 558 */ 559 560 private function replace_string($matches) 561 { 562 $match = $matches[0]; 563 $quote = substr($match, 0, 1); 564 // Must use addcslashes in PHP to avoid parsing of backslashes 565 $match = addcslashes($this->str_slice($match, 1, -1), '\\'); 566 567 // maybe the string contains a comment-like substring? 568 // one, maybe more? put'em back then 569 if (($pos = $this->index_of($match, self::COMMENT)) >= 0) { 570 for ($i = 0, $max = count($this->comments); $i < $max; $i++) { 571 $match = preg_replace('/' . self::COMMENT . $i . '___/', $this->comments[$i], $match, 1); 572 } 573 } 574 575 // minify alpha opacity in filter strings 576 $match = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $match); 577 578 $this->preserved_tokens[] = $match; 579 return $quote . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . $quote; 580 } 581 582 private function replace_colon($matches) 583 { 584 return preg_replace('/\:/', self::CLASSCOLON, $matches[0]); 585 } 586 587 private function replace_calc($matches) 588 { 589 $this->preserved_tokens[] = trim(preg_replace('/\s*([\*\/\(\),])\s*/', '$1', $matches[2])); 590 return 'calc('. self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . ')'; 591 } 592 593 private function preserve_old_IE_specific_matrix_definition($matches) 594 { 595 $this->preserved_tokens[] = $matches[1]; 596 return 'filter:progid:DXImageTransform.Microsoft.Matrix(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . ')'; 597 } 598 599 private function replace_keyframe_zero($matches) 600 { 601 return $matches[1] . preg_replace('/0(\{|,[^\)\{]+\{)/', '0%$1', $matches[2]) . $matches[3]; 602 } 603 604 private function rgb_to_hex($matches) 605 { 606 // Support for percentage values rgb(100%, 0%, 45%); 607 if ($this->index_of($matches[1], '%') >= 0){ 608 $rgbcolors = explode(',', str_replace('%', '', $matches[1])); 609 for ($i = 0; $i < count($rgbcolors); $i++) { 610 $rgbcolors[$i] = $this->round_number(floatval($rgbcolors[$i]) * 2.55); 611 } 612 } else { 613 $rgbcolors = explode(',', $matches[1]); 614 } 615 616 // Values outside the sRGB color space should be clipped (0-255) 617 for ($i = 0; $i < count($rgbcolors); $i++) { 618 $rgbcolors[$i] = $this->clamp_number(intval($rgbcolors[$i], 10), 0, 255); 619 $rgbcolors[$i] = sprintf("%02x", $rgbcolors[$i]); 620 } 621 622 // Fix for issue #2528093 623 if (!preg_match('/[\s\,\);\}]/', $matches[2])){ 624 $matches[2] = ' ' . $matches[2]; 625 } 626 627 return '#' . implode('', $rgbcolors) . $matches[2]; 628 } 629 630 private function hsl_to_hex($matches) 631 { 632 $values = explode(',', str_replace('%', '', $matches[1])); 633 $h = floatval($values[0]); 634 $s = floatval($values[1]); 635 $l = floatval($values[2]); 636 637 // Wrap and clamp, then fraction! 638 $h = ((($h % 360) + 360) % 360) / 360; 639 $s = $this->clamp_number($s, 0, 100) / 100; 640 $l = $this->clamp_number($l, 0, 100) / 100; 641 642 if ($s == 0) { 643 $r = $g = $b = $this->round_number(255 * $l); 644 } else { 645 $v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l); 646 $v1 = (2 * $l) - $v2; 647 $r = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h + (1/3))); 648 $g = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h)); 649 $b = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h - (1/3))); 650 } 651 652 return $this->rgb_to_hex(array('', $r.','.$g.','.$b, $matches[2])); 653 } 654 655 private function lowercase_pseudo_first($matches) 656 { 657 return ':first-'. strtolower($matches[1]) .' '. $matches[2]; 658 } 659 660 private function lowercase_directives($matches) 661 { 662 return '@'. strtolower($matches[1]); 663 } 664 665 private function lowercase_pseudo_elements($matches) 666 { 667 return ':'. strtolower($matches[1]); 668 } 669 670 private function lowercase_common_functions($matches) 671 { 672 return ':'. strtolower($matches[1]) .'('; 673 } 674 675 private function lowercase_common_functions_values($matches) 676 { 677 return $matches[1] . strtolower($matches[2]); 678 } 679 680 private function lowercase_properties($matches) 681 { 682 return $matches[1].strtolower($matches[2]).$matches[3]; 683 } 684 685 /* HELPERS 686 * --------------------------------------------------------------------------------------------- 687 */ 688 689 private function hue_to_rgb($v1, $v2, $vh) 690 { 691 $vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh); 692 if ($vh * 6 < 1) return $v1 + ($v2 - $v1) * 6 * $vh; 693 if ($vh * 2 < 1) return $v2; 694 if ($vh * 3 < 2) return $v1 + ($v2 - $v1) * ((2/3) - $vh) * 6; 695 return $v1; 696 } 697 698 private function round_number($n) 699 { 700 return intval(floor(floatval($n) + 0.5), 10); 701 } 702 703 private function clamp_number($n, $min, $max) 704 { 705 return min(max($n, $min), $max); 706 } 707 708 /** 709 * PHP port of Javascript's "indexOf" function for strings only 710 * Author: Tubal Martin http://blog.margenn.com 711 * 712 * @param string $haystack 713 * @param string $needle 714 * @param int $offset index (optional) 715 * @return int 716 */ 717 private function index_of($haystack, $needle, $offset = 0) 718 { 719 $index = strpos($haystack, $needle, $offset); 720 721 return ($index !== FALSE) ? $index : -1; 722 } 723 724 /** 725 * PHP port of Javascript's "slice" function for strings only 726 * Author: Tubal Martin http://blog.margenn.com 727 * Tests: http://margenn.com/tubal/str_slice/ 728 * 729 * @param string $str 730 * @param int $start index 731 * @param int|bool $end index (optional) 732 * @return string 733 */ 734 private function str_slice($str, $start = 0, $end = FALSE) 735 { 736 if ($end !== FALSE && ($start < 0 || $end <= 0)) { 737 $max = strlen($str); 738 739 if ($start < 0) { 740 if (($start = $max + $start) < 0) { 741 return ''; 742 } 743 } 744 745 if ($end < 0) { 746 if (($end = $max + $end) < 0) { 747 return ''; 748 } 749 } 750 751 if ($end <= $start) { 752 return ''; 753 } 754 } 755 756 $slice = ($end === FALSE) ? substr($str, $start) : substr($str, $start, $end - $start); 757 return ($slice === FALSE) ? '' : $slice; 758 } 759 760 /** 761 * Convert strings like "64M" or "30" to int values 762 * @param mixed $size 763 * @return int 764 */ 765 private function normalize_int($size) 766 { 767 if (is_string($size)) { 768 switch (substr($size, -1)) { 769 case 'M': case 'm': return (int) $size * 1048576; 770 case 'K': case 'k': return (int) $size * 1024; 771 case 'G': case 'g': return (int) $size * 1073741824; 772 } 773 } 774 775 return (int) $size; 776 } 777} 778