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| 1 | <?php |
| 2 | /** |
| 3 | * @private |
| 4 | */ |
| 5 | class Less_Visitor_processExtends extends Less_Visitor { |
| 6 | |
| 7 | public $allExtendsStack; |
| 8 | |
| 9 | /** |
| 10 | * @param Less_Tree_Ruleset $root |
| 11 | */ |
| 12 | public function run( $root ) { |
| 13 | $extendFinder = new Less_Visitor_extendFinder(); |
| 14 | $extendFinder->run( $root ); |
| 15 | if ( !$extendFinder->foundExtends ) { |
| 16 | return $root; |
| 17 | } |
| 18 | |
| 19 | $root->allExtends = $this->doExtendChaining( $root->allExtends, $root->allExtends ); |
| 20 | |
| 21 | $this->allExtendsStack = []; |
| 22 | $this->allExtendsStack[] = &$root->allExtends; |
| 23 | |
| 24 | return $this->visitObj( $root ); |
| 25 | } |
| 26 | |
| 27 | private function doExtendChaining( $extendsList, $extendsListTarget, $iterationCount = 0 ) { |
| 28 | // |
| 29 | // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering and pasting |
| 30 | // the selector we would do normally, but we are also adding an extend with the same target selector |
| 31 | // this means this new extend can then go and alter other extends |
| 32 | // |
| 33 | // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors |
| 34 | // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already processed if |
| 35 | // we look at each selector at a time, as is done in visitRuleset |
| 36 | |
| 37 | $extendsToAdd = []; |
| 38 | |
| 39 | // loop through comparing every extend with every target extend. |
| 40 | // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place |
| 41 | // e.g. .a:extend(.b) {} and .b:extend(.c) {} then the first extend extends the second one |
| 42 | // and the second is the target. |
| 43 | // the separation into two lists allows us to process a subset of chains with a bigger set, as is the |
| 44 | // case when processing media queries |
| 45 | for ( $extendIndex = 0, $extendsList_len = count( $extendsList ); $extendIndex < $extendsList_len; $extendIndex++ ) { |
| 46 | for ( $targetExtendIndex = 0; $targetExtendIndex < count( $extendsListTarget ); $targetExtendIndex++ ) { |
| 47 | |
| 48 | $extend = $extendsList[$extendIndex]; |
| 49 | $targetExtend = $extendsListTarget[$targetExtendIndex]; |
| 50 | |
| 51 | // Optimisation: Explicit reference, <https://github.com/wikimedia/less.php/pull/14> |
| 52 | if ( \array_key_exists( $targetExtend->object_id, $extend->parent_ids ) ) { |
| 53 | // ignore circular references |
| 54 | continue; |
| 55 | } |
| 56 | |
| 57 | // find a match in the target extends self selector (the bit before :extend) |
| 58 | $selectorPath = [ $targetExtend->selfSelectors[0] ]; |
| 59 | $matches = $this->findMatch( $extend, $selectorPath ); |
| 60 | |
| 61 | if ( $matches ) { |
| 62 | |
| 63 | // we found a match, so for each self selector.. |
| 64 | foreach ( $extend->selfSelectors as $selfSelector ) { |
| 65 | |
| 66 | // process the extend as usual |
| 67 | $newSelector = $this->extendSelector( $matches, $selectorPath, $selfSelector ); |
| 68 | |
| 69 | // but now we create a new extend from it |
| 70 | $newExtend = new Less_Tree_Extend( $targetExtend->selector, $targetExtend->option, 0 ); |
| 71 | $newExtend->selfSelectors = $newSelector; |
| 72 | |
| 73 | // add the extend onto the list of extends for that selector |
| 74 | end( $newSelector )->extendList = [ $newExtend ]; |
| 75 | // $newSelector[ count($newSelector)-1]->extendList = array($newExtend); |
| 76 | |
| 77 | // record that we need to add it. |
| 78 | $extendsToAdd[] = $newExtend; |
| 79 | $newExtend->ruleset = $targetExtend->ruleset; |
| 80 | |
| 81 | // remember its parents for circular references |
| 82 | $newExtend->parent_ids = array_merge( $newExtend->parent_ids, $targetExtend->parent_ids, $extend->parent_ids ); |
| 83 | |
| 84 | // only process the selector once.. if we have :extend(.a,.b) then multiple |
| 85 | // extends will look at the same selector path, so when extending |
| 86 | // we know that any others will be duplicates in terms of what is added to the css |
| 87 | if ( $targetExtend->firstExtendOnThisSelectorPath ) { |
| 88 | $newExtend->firstExtendOnThisSelectorPath = true; |
| 89 | $targetExtend->ruleset->paths[] = $newSelector; |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | if ( $extendsToAdd ) { |
| 97 | // try to detect circular references to stop a stack overflow. |
| 98 | // may no longer be needed. $this->extendChainCount++; |
| 99 | if ( $iterationCount > 100 ) { |
| 100 | |
| 101 | try { |
| 102 | $selectorOne = $extendsToAdd[0]->selfSelectors[0]->toCSS(); |
| 103 | $selectorTwo = $extendsToAdd[0]->selector->toCSS(); |
| 104 | } catch ( Exception $e ) { |
| 105 | $selectorOne = "{unable to calculate}"; |
| 106 | $selectorTwo = "{unable to calculate}"; |
| 107 | } |
| 108 | |
| 109 | throw new Less_Exception_Parser( "extend circular reference detected. One of the circular extends is currently:" . $selectorOne . ":extend(" . $selectorTwo . ")" ); |
| 110 | } |
| 111 | |
| 112 | // now process the new extends on the existing rules so that we can handle a extending b extending c ectending d extending e... |
| 113 | $extendsToAdd = $this->doExtendChaining( $extendsToAdd, $extendsListTarget, $iterationCount + 1 ); |
| 114 | } |
| 115 | |
| 116 | return array_merge( $extendsList, $extendsToAdd ); |
| 117 | } |
| 118 | |
| 119 | protected function visitDeclaration( $declNode, &$visitDeeper ) { |
| 120 | $visitDeeper = false; |
| 121 | } |
| 122 | |
| 123 | protected function visitMixinDefinition( $mixinDefinitionNode, &$visitDeeper ) { |
| 124 | $visitDeeper = false; |
| 125 | } |
| 126 | |
| 127 | protected function visitSelector( $selectorNode, &$visitDeeper ) { |
| 128 | $visitDeeper = false; |
| 129 | } |
| 130 | |
| 131 | protected function visitRuleset( $rulesetNode ) { |
| 132 | if ( $rulesetNode->root ) { |
| 133 | return; |
| 134 | } |
| 135 | |
| 136 | $allExtends = end( $this->allExtendsStack ); |
| 137 | $paths_len = count( $rulesetNode->paths ); |
| 138 | |
| 139 | // look at each selector path in the ruleset, find any extend matches and then copy, find and replace |
| 140 | foreach ( $allExtends as $allExtend ) { |
| 141 | for ( $pathIndex = 0; $pathIndex < $paths_len; $pathIndex++ ) { |
| 142 | |
| 143 | // extending extends happens initially, before the main pass |
| 144 | if ( isset( $rulesetNode->extendOnEveryPath ) && $rulesetNode->extendOnEveryPath ) { |
| 145 | continue; |
| 146 | } |
| 147 | |
| 148 | $selectorPath = $rulesetNode->paths[$pathIndex]; |
| 149 | |
| 150 | if ( end( $selectorPath )->extendList ) { |
| 151 | continue; |
| 152 | } |
| 153 | |
| 154 | $this->ExtendMatch( $rulesetNode, $allExtend, $selectorPath ); |
| 155 | |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | private function ExtendMatch( $rulesetNode, $extend, $selectorPath ) { |
| 161 | $matches = $this->findMatch( $extend, $selectorPath ); |
| 162 | |
| 163 | if ( $matches ) { |
| 164 | foreach ( $extend->selfSelectors as $selfSelector ) { |
| 165 | $rulesetNode->paths[] = $this->extendSelector( $matches, $selectorPath, $selfSelector ); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * @param Less_Tree_Extend $extend |
| 172 | * @param Less_Tree_Selector[] $haystackSelectorPath |
| 173 | * @return false|array<array{index:int,initialCombinator:string}> |
| 174 | */ |
| 175 | private function findMatch( $extend, $haystackSelectorPath ) { |
| 176 | if ( !$this->HasMatches( $extend, $haystackSelectorPath ) ) { |
| 177 | return false; |
| 178 | } |
| 179 | |
| 180 | // |
| 181 | // look through the haystack selector path to try and find the needle - extend.selector |
| 182 | // returns an array of selector matches that can then be replaced |
| 183 | // |
| 184 | $needleElements = $extend->selector->elements; |
| 185 | $potentialMatches = []; |
| 186 | $potentialMatches_len = 0; |
| 187 | $potentialMatch = null; |
| 188 | $matches = []; |
| 189 | |
| 190 | // loop through the haystack elements |
| 191 | $haystack_path_len = count( $haystackSelectorPath ); |
| 192 | for ( $haystackSelectorIndex = 0; $haystackSelectorIndex < $haystack_path_len; $haystackSelectorIndex++ ) { |
| 193 | $hackstackSelector = $haystackSelectorPath[$haystackSelectorIndex]; |
| 194 | |
| 195 | $haystack_elements_len = count( $hackstackSelector->elements ); |
| 196 | for ( $hackstackElementIndex = 0; $hackstackElementIndex < $haystack_elements_len; $hackstackElementIndex++ ) { |
| 197 | |
| 198 | $haystackElement = $hackstackSelector->elements[$hackstackElementIndex]; |
| 199 | |
| 200 | // if we allow elements before our match we can add a potential match every time. otherwise only at the first element. |
| 201 | if ( $extend->allowBefore || ( $haystackSelectorIndex === 0 && $hackstackElementIndex === 0 ) ) { |
| 202 | $potentialMatches[] = [ 'pathIndex' => $haystackSelectorIndex, 'index' => $hackstackElementIndex, 'matched' => 0, 'initialCombinator' => $haystackElement->combinator ]; |
| 203 | $potentialMatches_len++; |
| 204 | } |
| 205 | |
| 206 | for ( $i = 0; $i < $potentialMatches_len; $i++ ) { |
| 207 | |
| 208 | $potentialMatch = &$potentialMatches[$i]; |
| 209 | $potentialMatch = $this->PotentialMatch( $potentialMatch, $needleElements, $haystackElement, $hackstackElementIndex ); |
| 210 | |
| 211 | // if we are still valid and have finished, test whether we have elements after and whether these are allowed |
| 212 | if ( $potentialMatch && $potentialMatch['matched'] === $extend->selector->elements_len ) { |
| 213 | $potentialMatch['finished'] = true; |
| 214 | |
| 215 | if ( !$extend->allowAfter && ( $hackstackElementIndex + 1 < $haystack_elements_len || $haystackSelectorIndex + 1 < $haystack_path_len ) ) { |
| 216 | $potentialMatch = null; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | // if null we remove, if not, we are still valid, so either push as a valid match or continue |
| 221 | if ( $potentialMatch ) { |
| 222 | if ( $potentialMatch['finished'] ) { |
| 223 | $potentialMatch['length'] = $extend->selector->elements_len; |
| 224 | $potentialMatch['endPathIndex'] = $haystackSelectorIndex; |
| 225 | $potentialMatch['endPathElementIndex'] = $hackstackElementIndex + 1; // index after end of match |
| 226 | $potentialMatches = []; // we don't allow matches to overlap, so start matching again |
| 227 | $potentialMatches_len = 0; |
| 228 | $matches[] = $potentialMatch; |
| 229 | } |
| 230 | continue; |
| 231 | } |
| 232 | |
| 233 | array_splice( $potentialMatches, $i, 1 ); |
| 234 | $potentialMatches_len--; |
| 235 | $i--; |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | return $matches; |
| 241 | } |
| 242 | |
| 243 | // Before going through all the nested loops, lets check to see if a match is possible |
| 244 | // Reduces Bootstrap 3.1 compile time from ~6.5s to ~5.6s |
| 245 | private function HasMatches( $extend, $haystackSelectorPath ) { |
| 246 | if ( !$extend->selector->cacheable ) { |
| 247 | return true; |
| 248 | } |
| 249 | |
| 250 | $first_el = $extend->selector->_oelements[0]; |
| 251 | |
| 252 | foreach ( $haystackSelectorPath as $hackstackSelector ) { |
| 253 | if ( !$hackstackSelector->cacheable ) { |
| 254 | return true; |
| 255 | } |
| 256 | |
| 257 | // Optimisation: Explicit reference, <https://github.com/wikimedia/less.php/pull/14> |
| 258 | if ( \array_key_exists( $first_el, $hackstackSelector->_oelements_assoc ) ) { |
| 259 | return true; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | return false; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * @param array $potentialMatch |
| 268 | * @param Less_Tree_Element[] $needleElements |
| 269 | * @param Less_Tree_Element $haystackElement |
| 270 | * @param int $hackstackElementIndex |
| 271 | */ |
| 272 | private function PotentialMatch( $potentialMatch, $needleElements, $haystackElement, $hackstackElementIndex ) { |
| 273 | if ( $potentialMatch['matched'] > 0 ) { |
| 274 | |
| 275 | // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't |
| 276 | // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to work out |
| 277 | // what the resulting combinator will be |
| 278 | $targetCombinator = $haystackElement->combinator; |
| 279 | if ( $targetCombinator === '' && $hackstackElementIndex === 0 ) { |
| 280 | $targetCombinator = ' '; |
| 281 | } |
| 282 | |
| 283 | if ( $needleElements[ $potentialMatch['matched'] ]->combinator !== $targetCombinator ) { |
| 284 | return null; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | // if we don't match, null our match to indicate failure |
| 289 | if ( !$this->isElementValuesEqual( $needleElements[$potentialMatch['matched'] ]->value, $haystackElement->value ) ) { |
| 290 | return null; |
| 291 | } |
| 292 | |
| 293 | $potentialMatch['finished'] = false; |
| 294 | $potentialMatch['matched']++; |
| 295 | |
| 296 | return $potentialMatch; |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * @param string|Less_Tree_Attribute|Less_Tree_Dimension|Less_Tree_Keyword $elementValue1 |
| 301 | * @param string|Less_Tree_Attribute|Less_Tree_Dimension|Less_Tree_Keyword $elementValue2 |
| 302 | * @return bool |
| 303 | */ |
| 304 | private function isElementValuesEqual( $elementValue1, $elementValue2 ) { |
| 305 | if ( $elementValue1 === $elementValue2 ) { |
| 306 | return true; |
| 307 | } |
| 308 | |
| 309 | if ( is_string( $elementValue1 ) || is_string( $elementValue2 ) ) { |
| 310 | return false; |
| 311 | } |
| 312 | |
| 313 | if ( $elementValue1 instanceof Less_Tree_Attribute ) { |
| 314 | return $this->isAttributeValuesEqual( $elementValue1, $elementValue2 ); |
| 315 | } |
| 316 | |
| 317 | $elementValue1 = $elementValue1->value; |
| 318 | if ( $elementValue1 instanceof Less_Tree_Selector ) { |
| 319 | return $this->isSelectorValuesEqual( $elementValue1, $elementValue2 ); |
| 320 | } |
| 321 | |
| 322 | return false; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * @param Less_Tree_Selector $elementValue1 |
| 327 | */ |
| 328 | private function isSelectorValuesEqual( $elementValue1, $elementValue2 ) { |
| 329 | $elementValue2 = $elementValue2->value; |
| 330 | if ( !( $elementValue2 instanceof Less_Tree_Selector ) || $elementValue1->elements_len !== $elementValue2->elements_len ) { |
| 331 | return false; |
| 332 | } |
| 333 | |
| 334 | for ( $i = 0; $i < $elementValue1->elements_len; $i++ ) { |
| 335 | |
| 336 | if ( $elementValue1->elements[$i]->combinator !== $elementValue2->elements[$i]->combinator ) { |
| 337 | if ( $i !== 0 || ( $elementValue1->elements[$i]->combinator || ' ' ) !== ( $elementValue2->elements[$i]->combinator || ' ' ) ) { |
| 338 | return false; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | if ( !$this->isElementValuesEqual( $elementValue1->elements[$i]->value, $elementValue2->elements[$i]->value ) ) { |
| 343 | return false; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | return true; |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * @param Less_Tree_Attribute $elementValue1 |
| 352 | */ |
| 353 | private function isAttributeValuesEqual( $elementValue1, $elementValue2 ) { |
| 354 | if ( $elementValue1->op !== $elementValue2->op || $elementValue1->key !== $elementValue2->key ) { |
| 355 | return false; |
| 356 | } |
| 357 | |
| 358 | if ( !$elementValue1->value || !$elementValue2->value ) { |
| 359 | if ( $elementValue1->value || $elementValue2->value ) { |
| 360 | return false; |
| 361 | } |
| 362 | return true; |
| 363 | } |
| 364 | |
| 365 | $elementValue1 = $elementValue1->value; |
| 366 | |
| 367 | if ( $elementValue1 instanceof Less_Tree_Quoted ) { |
| 368 | $elementValue1 = $elementValue1->value; |
| 369 | } |
| 370 | |
| 371 | $elementValue2 = $elementValue2->value; |
| 372 | |
| 373 | if ( $elementValue2 instanceof Less_Tree_Quoted ) { |
| 374 | $elementValue2 = $elementValue2->value; |
| 375 | } |
| 376 | |
| 377 | return $elementValue1 === $elementValue2; |
| 378 | } |
| 379 | |
| 380 | private function extendSelector( $matches, $selectorPath, $replacementSelector ) { |
| 381 | // for a set of matches, replace each match with the replacement selector |
| 382 | |
| 383 | $currentSelectorPathIndex = 0; |
| 384 | $currentSelectorPathElementIndex = 0; |
| 385 | $path = []; |
| 386 | $selectorPath_len = count( $selectorPath ); |
| 387 | |
| 388 | for ( $matchIndex = 0, $matches_len = count( $matches ); $matchIndex < $matches_len; $matchIndex++ ) { |
| 389 | |
| 390 | $match = $matches[$matchIndex]; |
| 391 | $selector = $selectorPath[ $match['pathIndex'] ]; |
| 392 | |
| 393 | $firstElement = new Less_Tree_Element( |
| 394 | $match['initialCombinator'], |
| 395 | $replacementSelector->elements[0]->value, |
| 396 | $replacementSelector->elements[0]->index, |
| 397 | $replacementSelector->elements[0]->currentFileInfo |
| 398 | ); |
| 399 | |
| 400 | if ( $match['pathIndex'] > $currentSelectorPathIndex && $currentSelectorPathElementIndex > 0 ) { |
| 401 | $last_path = end( $path ); |
| 402 | $last_path->elements = array_merge( $last_path->elements, array_slice( $selectorPath[$currentSelectorPathIndex]->elements, $currentSelectorPathElementIndex ) ); |
| 403 | $currentSelectorPathElementIndex = 0; |
| 404 | $currentSelectorPathIndex++; |
| 405 | } |
| 406 | |
| 407 | $newElements = array_merge( |
| 408 | array_slice( |
| 409 | $selector->elements, |
| 410 | $currentSelectorPathElementIndex, |
| 411 | // last parameter of array_slice is different than the last parameter of javascript's slice |
| 412 | $match['index'] - $currentSelectorPathElementIndex |
| 413 | ), |
| 414 | [ $firstElement ], |
| 415 | array_slice( $replacementSelector->elements, 1 ) |
| 416 | ); |
| 417 | |
| 418 | if ( $currentSelectorPathIndex === $match['pathIndex'] && $matchIndex > 0 ) { |
| 419 | $last_key = count( $path ) - 1; |
| 420 | $path[$last_key]->elements = array_merge( $path[$last_key]->elements, $newElements ); |
| 421 | } else { |
| 422 | $path = array_merge( $path, array_slice( $selectorPath, $currentSelectorPathIndex, $match['pathIndex'] ) ); |
| 423 | $path[] = new Less_Tree_Selector( $newElements ); |
| 424 | } |
| 425 | |
| 426 | $currentSelectorPathIndex = $match['endPathIndex']; |
| 427 | $currentSelectorPathElementIndex = $match['endPathElementIndex']; |
| 428 | if ( $currentSelectorPathElementIndex >= count( $selectorPath[$currentSelectorPathIndex]->elements ) ) { |
| 429 | $currentSelectorPathElementIndex = 0; |
| 430 | $currentSelectorPathIndex++; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | if ( $currentSelectorPathIndex < $selectorPath_len && $currentSelectorPathElementIndex > 0 ) { |
| 435 | $last_path = end( $path ); |
| 436 | $last_path->elements = array_merge( $last_path->elements, array_slice( $selectorPath[$currentSelectorPathIndex]->elements, $currentSelectorPathElementIndex ) ); |
| 437 | $currentSelectorPathIndex++; |
| 438 | } |
| 439 | |
| 440 | $slice_len = $selectorPath_len - $currentSelectorPathIndex; |
| 441 | $path = array_merge( $path, array_slice( $selectorPath, $currentSelectorPathIndex, $slice_len ) ); |
| 442 | |
| 443 | return $path; |
| 444 | } |
| 445 | |
| 446 | protected function visitMedia( $mediaNode ) { |
| 447 | $newAllExtends = array_merge( $mediaNode->allExtends, end( $this->allExtendsStack ) ); |
| 448 | $this->allExtendsStack[] = $this->doExtendChaining( $newAllExtends, $mediaNode->allExtends ); |
| 449 | } |
| 450 | |
| 451 | protected function visitMediaOut() { |
| 452 | array_pop( $this->allExtendsStack ); |
| 453 | } |
| 454 | |
| 455 | protected function visitAtRule( $atRuleNode ) { |
| 456 | $newAllExtends = array_merge( $atRuleNode->allExtends, end( $this->allExtendsStack ) ); |
| 457 | $this->allExtendsStack[] = $this->doExtendChaining( $newAllExtends, $atRuleNode->allExtends ); |
| 458 | } |
| 459 | |
| 460 | protected function visitAtRuleOut() { |
| 461 | array_pop( $this->allExtendsStack ); |
| 462 | } |
| 463 | |
| 464 | } |