includes/libs/lessc.inc.php

   1 <?php
   2
   3 /**
   4  * lessphp v0.4.0@6e8e724fc7
   5  * http://leafo.net/lessphp
   6  *
   7  * LESS css compiler, adapted from http://lesscss.org
   8  *
   9  * For ease of distribution, lessphp 0.4.0 is under a dual license.
  10  * You are free to pick which one suits your needs.
  11  *
  12  * MIT LICENSE
  13  *
  14  * Copyright 2013, Leaf Corcoran <leafot@gmail.com>
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining
  17  * a copy of this software and associated documentation files (the
  18  * "Software"), to deal in the Software without restriction, including
  19  * without limitation the rights to use, copy, modify, merge, publish,
  20  * distribute, sublicense, and/or sell copies of the Software, and to
  21  * permit persons to whom the Software is furnished to do so, subject to
  22  * the following conditions:
  23  *
  24  * The above copyright notice and this permission notice shall be
  25  * included in all copies or substantial portions of the Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34  *
  35  * GPL VERSION 3
  36  *
  37  * Please refer to http://www.gnu.org/licenses/gpl-3.0.html for the full
  38  * text of the GPL version 3
  39  */
  40
  41
  42 /**
  43  * The less compiler and parser.
  44  *
  45  * Converting LESS to CSS is a three stage process. The incoming file is parsed
  46  * by `lessc_parser` into a syntax tree, then it is compiled into another tree
  47  * representing the CSS structure by `lessc`. The CSS tree is fed into a
  48  * formatter, like `lessc_formatter` which then outputs CSS as a string.
  49  *
  50  * During the first compile, all values are *reduced*, which means that their
  51  * types are brought to the lowest form before being dump as strings. This
  52  * handles math equations, variable dereferences, and the like.
  53  *
  54  * The `parse` function of `lessc` is the entry point.
  55  *
  56  * In summary:
  57  *
  58  * The `lessc` class creates an instance of the parser, feeds it LESS code,
  59  * then transforms the resulting tree to a CSS tree. This class also holds the
  60  * evaluation context, such as all available mixins and variables at any given
  61  * time.
  62  *
  63  * The `lessc_parser` class is only concerned with parsing its input.
  64  *
  65  * The `lessc_formatter` takes a CSS tree, and dumps it to a formatted string,
  66  * handling things like indentation.
  67  */
  68 class lessc {
  69         static public $VERSION = "v0.4.0";
  70         static protected $TRUE = array("keyword", "true");
  71         static protected $FALSE = array("keyword", "false");
  72
  73         protected $libFunctions = array();
  74         protected $registeredVars = array();
  75         protected $preserveComments = false;
  76
  77         public $vPrefix = '@'; // prefix of abstract properties
  78         public $mPrefix = '$'; // prefix of abstract blocks
  79         public $parentSelector = '&';
  80
  81         public $importDisabled = false;
  82         public $importDir = '';
  83
  84         protected $numberPrecision = null;
  85
  86         protected $allParsedFiles = array();
  87
  88         // set to the parser that generated the current line when compiling
  89         // so we know how to create error messages
  90         protected $sourceParser = null;
  91         protected $sourceLoc = null;
  92
  93         static protected $nextImportId = 0; // uniquely identify imports
  94
  95         // attempts to find the path of an import url, returns null for css files
  96         protected function findImport($url) {
  97                 foreach ((array)$this->importDir as $dir) {
  98                         $full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
  99                         if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
 100                                 return $file;
 101                         }
 102                 }
 103
 104                 return null;
 105         }
 106
 107         protected function fileExists($name) {
 108                 return is_file($name);
 109         }
 110
 111         static public function compressList($items, $delim) {
 112                 if (!isset($items[1]) && isset($items[0])) return $items[0];
 113                 else return array('list', $delim, $items);
 114         }
 115
 116         static public function preg_quote($what) {
 117                 return preg_quote($what, '/');
 118         }
 119
 120         protected function tryImport($importPath, $parentBlock, $out) {
 121                 if ($importPath[0] == "function" && $importPath[1] == "url") {
 122                         $importPath = $this->flattenList($importPath[2]);
 123                 }
 124
 125                 $str = $this->coerceString($importPath);
 126                 if ($str === null) return false;
 127
 128                 $url = $this->compileValue($this->lib_e($str));
 129
 130                 // don't import if it ends in css
 131                 if (substr_compare($url, '.css', -4, 4) === 0) return false;
 132
 133                 $realPath = $this->findImport($url);
 134
 135                 if ($realPath === null) return false;
 136
 137                 if ($this->importDisabled) {
 138                         return array(false, "/* import disabled */");
 139                 }
 140
 141                 if (isset($this->allParsedFiles[realpath($realPath)])) {
 142                         return array(false, null);
 143                 }
 144
 145                 $this->addParsedFile($realPath);
 146                 $parser = $this->makeParser($realPath);
 147                 $root = $parser->parse(file_get_contents($realPath));
 148
 149                 // set the parents of all the block props
 150                 foreach ($root->props as $prop) {
 151                         if ($prop[0] == "block") {
 152                                 $prop[1]->parent = $parentBlock;
 153                         }
 154                 }
 155
 156                 // copy mixins into scope, set their parents
 157                 // bring blocks from import into current block
 158                 // TODO: need to mark the source parser these came from this file
 159                 foreach ($root->children as $childName => $child) {
 160                         if (isset($parentBlock->children[$childName])) {
 161                                 $parentBlock->children[$childName] = array_merge(
 162                                         $parentBlock->children[$childName],
 163                                         $child);
 164                         } else {
 165                                 $parentBlock->children[$childName] = $child;
 166                         }
 167                 }
 168
 169                 $pi = pathinfo($realPath);
 170                 $dir = $pi["dirname"];
 171
 172                 list($top, $bottom) = $this->sortProps($root->props, true);
 173                 $this->compileImportedProps($top, $parentBlock, $out, $parser, $dir);
 174
 175                 return array(true, $bottom, $parser, $dir);
 176         }
 177
 178         protected function compileImportedProps($props, $block, $out, $sourceParser, $importDir) {
 179                 $oldSourceParser = $this->sourceParser;
 180
 181                 $oldImport = $this->importDir;
 182
 183                 // TODO: this is because the importDir api is stupid
 184                 $this->importDir = (array)$this->importDir;
 185                 array_unshift($this->importDir, $importDir);
 186
 187                 foreach ($props as $prop) {
 188                         $this->compileProp($prop, $block, $out);
 189                 }
 190
 191                 $this->importDir = $oldImport;
 192                 $this->sourceParser = $oldSourceParser;
 193         }
 194
 195         /**
 196          * Recursively compiles a block.
 197          *
 198          * A block is analogous to a CSS block in most cases. A single LESS document
 199          * is encapsulated in a block when parsed, but it does not have parent tags
 200          * so all of it's children appear on the root level when compiled.
 201          *
 202          * Blocks are made up of props and children.
 203          *
 204          * Props are property instructions, array tuples which describe an action
 205          * to be taken, eg. write a property, set a variable, mixin a block.
 206          *
 207          * The children of a block are just all the blocks that are defined within.
 208          * This is used to look up mixins when performing a mixin.
 209          *
 210          * Compiling the block involves pushing a fresh environment on the stack,
 211          * and iterating through the props, compiling each one.
 212          *
 213          * See lessc::compileProp()
 214          *
 215          */
 216         protected function compileBlock($block) {
 217                 switch ($block->type) {
 218                 case "root":
 219                         $this->compileRoot($block);
 220                         break;
 221                 case null:
 222                         $this->compileCSSBlock($block);
 223                         break;
 224                 case "media":
 225                         $this->compileMedia($block);
 226                         break;
 227                 case "directive":
 228                         $name = "@" . $block->name;
 229                         if (!empty($block->value)) {
 230                                 $name .= " " . $this->compileValue($this->reduce($block->value));
 231                         }
 232
 233                         $this->compileNestedBlock($block, array($name));
 234                         break;
 235                 default:
 236                         $this->throwError("unknown block type: $block->type\n");
 237                 }
 238         }
 239
 240         protected function compileCSSBlock($block) {
 241                 $env = $this->pushEnv();
 242
 243                 $selectors = $this->compileSelectors($block->tags);
 244                 $env->selectors = $this->multiplySelectors($selectors);
 245                 $out = $this->makeOutputBlock(null, $env->selectors);
 246
 247                 $this->scope->children[] = $out;
 248                 $this->compileProps($block, $out);
 249
 250                 $block->scope = $env; // mixins carry scope with them!
 251                 $this->popEnv();
 252         }
 253
 254         protected function compileMedia($media) {
 255                 $env = $this->pushEnv($media);
 256                 $parentScope = $this->mediaParent($this->scope);
 257
 258                 $query = $this->compileMediaQuery($this->multiplyMedia($env));
 259
 260                 $this->scope = $this->makeOutputBlock($media->type, array($query));
 261                 $parentScope->children[] = $this->scope;
 262
 263                 $this->compileProps($media, $this->scope);
 264
 265                 if (count($this->scope->lines) > 0) {
 266                         $orphanSelelectors = $this->findClosestSelectors();
 267                         if (!is_null($orphanSelelectors)) {
 268                                 $orphan = $this->makeOutputBlock(null, $orphanSelelectors);
 269                                 $orphan->lines = $this->scope->lines;
 270                                 array_unshift($this->scope->children, $orphan);
 271                                 $this->scope->lines = array();
 272                         }
 273                 }
 274
 275                 $this->scope = $this->scope->parent;
 276                 $this->popEnv();
 277         }
 278
 279         protected function mediaParent($scope) {
 280                 while (!empty($scope->parent)) {
 281                         if (!empty($scope->type) && $scope->type != "media") {
 282                                 break;
 283                         }
 284                         $scope = $scope->parent;
 285                 }
 286
 287                 return $scope;
 288         }
 289
 290         protected function compileNestedBlock($block, $selectors) {
 291                 $this->pushEnv($block);
 292                 $this->scope = $this->makeOutputBlock($block->type, $selectors);
 293                 $this->scope->parent->children[] = $this->scope;
 294
 295                 $this->compileProps($block, $this->scope);
 296
 297                 $this->scope = $this->scope->parent;
 298                 $this->popEnv();
 299         }
 300
 301         protected function compileRoot($root) {
 302                 $this->pushEnv();
 303                 $this->scope = $this->makeOutputBlock($root->type);
 304                 $this->compileProps($root, $this->scope);
 305                 $this->popEnv();
 306         }
 307
 308         protected function compileProps($block, $out) {
 309                 foreach ($this->sortProps($block->props) as $prop) {
 310                         $this->compileProp($prop, $block, $out);
 311                 }
 312
 313                 $out->lines = array_values(array_unique($out->lines));
 314         }
 315
 316         protected function sortProps($props, $split = false) {
 317                 $vars = array();
 318                 $imports = array();
 319                 $other = array();
 320
 321                 foreach ($props as $prop) {
 322                         switch ($prop[0]) {
 323                         case "assign":
 324                                 if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix) {
 325                                         $vars[] = $prop;
 326                                 } else {
 327                                         $other[] = $prop;
 328                                 }
 329                                 break;
 330                         case "import":
 331                                 $id = self::$nextImportId++;
 332                                 $prop[] = $id;
 333                                 $imports[] = $prop;
 334                                 $other[] = array("import_mixin", $id);
 335                                 break;
 336                         default:
 337                                 $other[] = $prop;
 338                         }
 339                 }
 340
 341                 if ($split) {
 342                         return array(array_merge($vars, $imports), $other);
 343                 } else {
 344                         return array_merge($vars, $imports, $other);
 345                 }
 346         }
 347
 348         protected function compileMediaQuery($queries) {
 349                 $compiledQueries = array();
 350                 foreach ($queries as $query) {
 351                         $parts = array();
 352                         foreach ($query as $q) {
 353                                 switch ($q[0]) {
 354                                 case "mediaType":
 355                                         $parts[] = implode(" ", array_slice($q, 1));
 356                                         break;
 357                                 case "mediaExp":
 358                                         if (isset($q[2])) {
 359                                                 $parts[] = "($q[1]: " .
 360                                                         $this->compileValue($this->reduce($q[2])) . ")";
 361                                         } else {
 362                                                 $parts[] = "($q[1])";
 363                                         }
 364                                         break;
 365                                 case "variable":
 366                                         $parts[] = $this->compileValue($this->reduce($q));
 367                                 break;
 368                                 }
 369                         }
 370
 371                         if (count($parts) > 0) {
 372                                 $compiledQueries[] =  implode(" and ", $parts);
 373                         }
 374                 }
 375
 376                 $out = "@media";
 377                 if (!empty($parts)) {
 378                         $out .= " " .
 379                                 implode($this->formatter->selectorSeparator, $compiledQueries);
 380                 }
 381                 return $out;
 382         }
 383
 384         protected function multiplyMedia($env, $childQueries = null) {
 385                 if (is_null($env) ||
 386                         !empty($env->block->type) && $env->block->type != "media")
 387                 {
 388                         return $childQueries;
 389                 }
 390
 391                 // plain old block, skip
 392                 if (empty($env->block->type)) {
 393                         return $this->multiplyMedia($env->parent, $childQueries);
 394                 }
 395
 396                 $out = array();
 397                 $queries = $env->block->queries;
 398                 if (is_null($childQueries)) {
 399                         $out = $queries;
 400                 } else {
 401                         foreach ($queries as $parent) {
 402                                 foreach ($childQueries as $child) {
 403                                         $out[] = array_merge($parent, $child);
 404                                 }
 405                         }
 406                 }
 407
 408                 return $this->multiplyMedia($env->parent, $out);
 409         }
 410
 411         protected function expandParentSelectors(&$tag, $replace) {
 412                 $parts = explode("$&$", $tag);
 413                 $count = 0;
 414                 foreach ($parts as &$part) {
 415                         $part = str_replace($this->parentSelector, $replace, $part, $c);
 416                         $count += $c;
 417                 }
 418                 $tag = implode($this->parentSelector, $parts);
 419                 return $count;
 420         }
 421
 422         protected function findClosestSelectors() {
 423                 $env = $this->env;
 424                 $selectors = null;
 425                 while ($env !== null) {
 426                         if (isset($env->selectors)) {
 427                                 $selectors = $env->selectors;
 428                                 break;
 429                         }
 430                         $env = $env->parent;
 431                 }
 432
 433                 return $selectors;
 434         }
 435
 436
 437         // multiply $selectors against the nearest selectors in env
 438         protected function multiplySelectors($selectors) {
 439                 // find parent selectors
 440
 441                 $parentSelectors = $this->findClosestSelectors();
 442                 if (is_null($parentSelectors)) {
 443                         // kill parent reference in top level selector
 444                         foreach ($selectors as &$s) {
 445                                 $this->expandParentSelectors($s, "");
 446                         }
 447
 448                         return $selectors;
 449                 }
 450
 451                 $out = array();
 452                 foreach ($parentSelectors as $parent) {
 453                         foreach ($selectors as $child) {
 454                                 $count = $this->expandParentSelectors($child, $parent);
 455
 456                                 // don't prepend the parent tag if & was used
 457                                 if ($count > 0) {
 458                                         $out[] = trim($child);
 459                                 } else {
 460                                         $out[] = trim($parent . ' ' . $child);
 461                                 }
 462                         }
 463                 }
 464
 465                 return $out;
 466         }
 467
 468         // reduces selector expressions
 469         protected function compileSelectors($selectors) {
 470                 $out = array();
 471
 472                 foreach ($selectors as $s) {
 473                         if (is_array($s)) {
 474                                 list(, $value) = $s;
 475                                 $out[] = trim($this->compileValue($this->reduce($value)));
 476                         } else {
 477                                 $out[] = $s;
 478                         }
 479                 }
 480
 481                 return $out;
 482         }
 483
 484         protected function eq($left, $right) {
 485                 return $left == $right;
 486         }
 487
 488         protected function patternMatch($block, $orderedArgs, $keywordArgs) {
 489                 // match the guards if it has them
 490                 // any one of the groups must have all its guards pass for a match
 491                 if (!empty($block->guards)) {
 492                         $groupPassed = false;
 493                         foreach ($block->guards as $guardGroup) {
 494                                 foreach ($guardGroup as $guard) {
 495                                         $this->pushEnv();
 496                                         $this->zipSetArgs($block->args, $orderedArgs, $keywordArgs);
 497
 498                                         $negate = false;
 499                                         if ($guard[0] == "negate") {
 500                                                 $guard = $guard[1];
 501                                                 $negate = true;
 502                                         }
 503
 504                                         $passed = $this->reduce($guard) == self::$TRUE;
 505                                         if ($negate) $passed = !$passed;
 506
 507                                         $this->popEnv();
 508
 509                                         if ($passed) {
 510                                                 $groupPassed = true;
 511                                         } else {
 512                                                 $groupPassed = false;
 513                                                 break;
 514                                         }
 515                                 }
 516
 517                                 if ($groupPassed) break;
 518                         }
 519
 520                         if (!$groupPassed) {
 521                                 return false;
 522                         }
 523                 }
 524
 525                 if (empty($block->args)) {
 526                         return $block->isVararg || empty($orderedArgs) && empty($keywordArgs);
 527                 }
 528
 529                 $remainingArgs = $block->args;
 530                 if ($keywordArgs) {
 531                         $remainingArgs = array();
 532                         foreach ($block->args as $arg) {
 533                                 if ($arg[0] == "arg" && isset($keywordArgs[$arg[1]])) {
 534                                         continue;
 535                                 }
 536
 537                                 $remainingArgs[] = $arg;
 538                         }
 539                 }
 540
 541                 $i = -1; // no args
 542                 // try to match by arity or by argument literal
 543                 foreach ($remainingArgs as $i => $arg) {
 544                         switch ($arg[0]) {
 545                         case "lit":
 546                                 if (empty($orderedArgs[$i]) || !$this->eq($arg[1], $orderedArgs[$i])) {
 547                                         return false;
 548                                 }
 549                                 break;
 550                         case "arg":
 551                                 // no arg and no default value
 552                                 if (!isset($orderedArgs[$i]) && !isset($arg[2])) {
 553                                         return false;
 554                                 }
 555                                 break;
 556                         case "rest":
 557                                 $i--; // rest can be empty
 558                                 break 2;
 559                         }
 560                 }
 561
 562                 if ($block->isVararg) {
 563                         return true; // not having enough is handled above
 564                 } else {
 565                         $numMatched = $i + 1;
 566                         // greater than becuase default values always match
 567                         return $numMatched >= count($orderedArgs);
 568                 }
 569         }
 570
 571         protected function patternMatchAll($blocks, $orderedArgs, $keywordArgs, $skip=array()) {
 572                 $matches = null;
 573                 foreach ($blocks as $block) {
 574                         // skip seen blocks that don't have arguments
 575                         if (isset($skip[$block->id]) && !isset($block->args)) {
 576                                 continue;
 577                         }
 578
 579                         if ($this->patternMatch($block, $orderedArgs, $keywordArgs)) {
 580                                 $matches[] = $block;
 581                         }
 582                 }
 583
 584                 return $matches;
 585         }
 586
 587         // attempt to find blocks matched by path and args
 588         protected function findBlocks($searchIn, $path, $orderedArgs, $keywordArgs, $seen=array()) {
 589                 if ($searchIn == null) return null;
 590                 if (isset($seen[$searchIn->id])) return null;
 591                 $seen[$searchIn->id] = true;
 592
 593                 $name = $path[0];
 594
 595                 if (isset($searchIn->children[$name])) {
 596                         $blocks = $searchIn->children[$name];
 597                         if (count($path) == 1) {
 598                                 $matches = $this->patternMatchAll($blocks, $orderedArgs, $keywordArgs, $seen);
 599                                 if (!empty($matches)) {
 600                                         // This will return all blocks that match in the closest
 601                                         // scope that has any matching block, like lessjs
 602                                         return $matches;
 603                                 }
 604                         } else {
 605                                 $matches = array();
 606                                 foreach ($blocks as $subBlock) {
 607                                         $subMatches = $this->findBlocks($subBlock,
 608                                                 array_slice($path, 1), $orderedArgs, $keywordArgs, $seen);
 609
 610                                         if (!is_null($subMatches)) {
 611                                                 foreach ($subMatches as $sm) {
 612                                                         $matches[] = $sm;
 613                                                 }
 614                                         }
 615                                 }
 616
 617                                 return count($matches) > 0 ? $matches : null;
 618                         }
 619                 }
 620                 if ($searchIn->parent === $searchIn) return null;
 621                 return $this->findBlocks($searchIn->parent, $path, $orderedArgs, $keywordArgs, $seen);
 622         }
 623
 624         // sets all argument names in $args to either the default value
 625         // or the one passed in through $values
 626         protected function zipSetArgs($args, $orderedValues, $keywordValues) {
 627                 $assignedValues = array();
 628
 629                 $i = 0;
 630                 foreach ($args as  $a) {
 631                         if ($a[0] == "arg") {
 632                                 if (isset($keywordValues[$a[1]])) {
 633                                         // has keyword arg
 634                                         $value = $keywordValues[$a[1]];
 635                                 } elseif (isset($orderedValues[$i])) {
 636                                         // has ordered arg
 637                                         $value = $orderedValues[$i];
 638                                         $i++;
 639                                 } elseif (isset($a[2])) {
 640                                         // has default value
 641                                         $value = $a[2];
 642                                 } else {
 643                                         $this->throwError("Failed to assign arg " . $a[1]);
 644                                         $value = null; // :(
 645                                 }
 646
 647                                 $value = $this->reduce($value);
 648                                 $this->set($a[1], $value);
 649                                 $assignedValues[] = $value;
 650                         } else {
 651                                 // a lit
 652                                 $i++;
 653                         }
 654                 }
 655
 656                 // check for a rest
 657                 $last = end($args);
 658                 if ($last[0] == "rest") {
 659                         $rest = array_slice($orderedValues, count($args) - 1);
 660                         $this->set($last[1], $this->reduce(array("list", " ", $rest)));
 661                 }
 662
 663                 // wow is this the only true use of PHP's + operator for arrays?
 664                 $this->env->arguments = $assignedValues + $orderedValues;
 665         }
 666
 667         // compile a prop and update $lines or $blocks appropriately
 668         protected function compileProp($prop, $block, $out) {
 669                 // set error position context
 670                 $this->sourceLoc = isset($prop[-1]) ? $prop[-1] : -1;
 671
 672                 switch ($prop[0]) {
 673                 case 'assign':
 674                         list(, $name, $value) = $prop;
 675                         if ($name[0] == $this->vPrefix) {
 676                                 $this->set($name, $value);
 677                         } else {
 678                                 $out->lines[] = $this->formatter->property($name,
 679                                                 $this->compileValue($this->reduce($value)));
 680                         }
 681                         break;
 682                 case 'block':
 683                         list(, $child) = $prop;
 684                         $this->compileBlock($child);
 685                         break;
 686                 case 'mixin':
 687                         list(, $path, $args, $suffix) = $prop;
 688
 689                         $orderedArgs = array();
 690                         $keywordArgs = array();
 691                         foreach ((array)$args as $arg) {
 692                                 $argval = null;
 693                                 switch ($arg[0]) {
 694                                 case "arg":
 695                                         if (!isset($arg[2])) {
 696                                                 $orderedArgs[] = $this->reduce(array("variable", $arg[1]));
 697                                         } else {
 698                                                 $keywordArgs[$arg[1]] = $this->reduce($arg[2]);
 699                                         }
 700                                         break;
 701
 702                                 case "lit":
 703                                         $orderedArgs[] = $this->reduce($arg[1]);
 704                                         break;
 705                                 default:
 706                                         $this->throwError("Unknown arg type: " . $arg[0]);
 707                                 }
 708                         }
 709
 710                         $mixins = $this->findBlocks($block, $path, $orderedArgs, $keywordArgs);
 711
 712                         if ($mixins === null) {
 713                                 $this->throwError("{$prop[1][0]} is undefined");
 714                         }
 715
 716                         foreach ($mixins as $mixin) {
 717                                 if ($mixin === $block && !$orderedArgs) {
 718                                         continue;
 719                                 }
 720
 721                                 $haveScope = false;
 722                                 if (isset($mixin->parent->scope)) {
 723                                         $haveScope = true;
 724                                         $mixinParentEnv = $this->pushEnv();
 725                                         $mixinParentEnv->storeParent = $mixin->parent->scope;
 726                                 }
 727
 728                                 $haveArgs = false;
 729                                 if (isset($mixin->args)) {
 730                                         $haveArgs = true;
 731                                         $this->pushEnv();
 732                                         $this->zipSetArgs($mixin->args, $orderedArgs, $keywordArgs);
 733                                 }
 734
 735                                 $oldParent = $mixin->parent;
 736                                 if ($mixin != $block) $mixin->parent = $block;
 737
 738                                 foreach ($this->sortProps($mixin->props) as $subProp) {
 739                                         if ($suffix !== null &&
 740                                                 $subProp[0] == "assign" &&
 741                                                 is_string($subProp[1]) &&
 742                                                 $subProp[1]{0} != $this->vPrefix)
 743                                         {
 744                                                 $subProp[2] = array(
 745                                                         'list', ' ',
 746                                                         array($subProp[2], array('keyword', $suffix))
 747                                                 );
 748                                         }
 749
 750                                         $this->compileProp($subProp, $mixin, $out);
 751                                 }
 752
 753                                 $mixin->parent = $oldParent;
 754
 755                                 if ($haveArgs) $this->popEnv();
 756                                 if ($haveScope) $this->popEnv();
 757                         }
 758
 759                         break;
 760                 case 'raw':
 761                         $out->lines[] = $prop[1];
 762                         break;
 763                 case "directive":
 764                         list(, $name, $value) = $prop;
 765                         $out->lines[] = "@$name " . $this->compileValue($this->reduce($value)).';';
 766                         break;
 767                 case "comment":
 768                         $out->lines[] = $prop[1];
 769                         break;
 770                 case "import";
 771                         list(, $importPath, $importId) = $prop;
 772                         $importPath = $this->reduce($importPath);
 773
 774                         if (!isset($this->env->imports)) {
 775                                 $this->env->imports = array();
 776                         }
 777
 778                         $result = $this->tryImport($importPath, $block, $out);
 779
 780                         $this->env->imports[$importId] = $result === false ?
 781                                 array(false, "@import " . $this->compileValue($importPath).";") :
 782                                 $result;
 783
 784                         break;
 785                 case "import_mixin":
 786                         list(,$importId) = $prop;
 787                         $import = $this->env->imports[$importId];
 788                         if ($import[0] === false) {
 789                                 if (isset($import[1])) {
 790                                         $out->lines[] = $import[1];
 791                                 }
 792                         } else {
 793                                 list(, $bottom, $parser, $importDir) = $import;
 794                                 $this->compileImportedProps($bottom, $block, $out, $parser, $importDir);
 795                         }
 796
 797                         break;
 798                 default:
 799                         $this->throwError("unknown op: {$prop[0]}\n");
 800                 }
 801         }
 802
 803
 804         /**
 805          * Compiles a primitive value into a CSS property value.
 806          *
 807          * Values in lessphp are typed by being wrapped in arrays, their format is
 808          * typically:
 809          *
 810          *     array(type, contents [, additional_contents]*)
 811          *
 812          * The input is expected to be reduced. This function will not work on
 813          * things like expressions and variables.
 814          */
 815         protected function compileValue($value) {
 816                 switch ($value[0]) {
 817                 case 'list':
 818                         // [1] - delimiter
 819                         // [2] - array of values
 820                         return implode($value[1], array_map(array($this, 'compileValue'), $value[2]));
 821                 case 'raw_color':
 822                         if (!empty($this->formatter->compressColors)) {
 823                                 return $this->compileValue($this->coerceColor($value));
 824                         }
 825                         return $value[1];
 826                 case 'keyword':
 827                         // [1] - the keyword
 828                         return $value[1];
 829                 case 'number':
 830                         list(, $num, $unit) = $value;
 831                         // [1] - the number
 832                         // [2] - the unit
 833                         if ($this->numberPrecision !== null) {
 834                                 $num = round($num, $this->numberPrecision);
 835                         }
 836                         return $num . $unit;
 837                 case 'string':
 838                         // [1] - contents of string (includes quotes)
 839                         list(, $delim, $content) = $value;
 840                         foreach ($content as &$part) {
 841                                 if (is_array($part)) {
 842                                         $part = $this->compileValue($part);
 843                                 }
 844                         }
 845                         return $delim . implode($content) . $delim;
 846                 case 'color':
 847                         // [1] - red component (either number or a %)
 848                         // [2] - green component
 849                         // [3] - blue component
 850                         // [4] - optional alpha component
 851                         list(, $r, $g, $b) = $value;
 852                         $r = round($r);
 853                         $g = round($g);
 854                         $b = round($b);
 855
 856                         if (count($value) == 5 && $value[4] != 1) { // rgba
 857                                 return 'rgba('.$r.','.$g.','.$b.','.$value[4].')';
 858                         }
 859
 860                         $h = sprintf("#%02x%02x%02x", $r, $g, $b);
 861
 862                         if (!empty($this->formatter->compressColors)) {
 863                                 // Converting hex color to short notation (e.g. #003399 to #039)
 864                                 if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
 865                                         $h = '#' . $h[1] . $h[3] . $h[5];
 866                                 }
 867                         }
 868
 869                         return $h;
 870
 871                 case 'function':
 872                         list(, $name, $args) = $value;
 873                         return $name.'('.$this->compileValue($args).')';
 874                 default: // assumed to be unit
 875                         $this->throwError("unknown value type: $value[0]");
 876                 }
 877         }
 878
 879         protected function lib_pow($args) {
 880                 list($base, $exp) = $this->assertArgs($args, 2, "pow");
 881                 return pow($this->assertNumber($base), $this->assertNumber($exp));
 882         }
 883
 884         protected function lib_pi() {
 885                 return pi();
 886         }
 887
 888         protected function lib_mod($args) {
 889                 list($a, $b) = $this->assertArgs($args, 2, "mod");
 890                 return $this->assertNumber($a) % $this->assertNumber($b);
 891         }
 892
 893         protected function lib_tan($num) {
 894                 return tan($this->assertNumber($num));
 895         }
 896
 897         protected function lib_sin($num) {
 898                 return sin($this->assertNumber($num));
 899         }
 900
 901         protected function lib_cos($num) {
 902                 return cos($this->assertNumber($num));
 903         }
 904
 905         protected function lib_atan($num) {
 906                 $num = atan($this->assertNumber($num));
 907                 return array("number", $num, "rad");
 908         }
 909
 910         protected function lib_asin($num) {
 911                 $num = asin($this->assertNumber($num));
 912                 return array("number", $num, "rad");
 913         }
 914
 915         protected function lib_acos($num) {
 916                 $num = acos($this->assertNumber($num));
 917                 return array("number", $num, "rad");
 918         }
 919
 920         protected function lib_sqrt($num) {
 921                 return sqrt($this->assertNumber($num));
 922         }
 923
 924         protected function lib_extract($value) {
 925                 list($list, $idx) = $this->assertArgs($value, 2, "extract");
 926                 $idx = $this->assertNumber($idx);
 927                 // 1 indexed
 928                 if ($list[0] == "list" && isset($list[2][$idx - 1])) {
 929                         return $list[2][$idx - 1];
 930                 }
 931         }
 932
 933         protected function lib_isnumber($value) {
 934                 return $this->toBool($value[0] == "number");
 935         }
 936
 937         protected function lib_isstring($value) {
 938                 return $this->toBool($value[0] == "string");
 939         }
 940
 941         protected function lib_iscolor($value) {
 942                 return $this->toBool($this->coerceColor($value));
 943         }
 944
 945         protected function lib_iskeyword($value) {
 946                 return $this->toBool($value[0] == "keyword");
 947         }
 948
 949         protected function lib_ispixel($value) {
 950                 return $this->toBool($value[0] == "number" && $value[2] == "px");
 951         }
 952
 953         protected function lib_ispercentage($value) {
 954                 return $this->toBool($value[0] == "number" && $value[2] == "%");
 955         }
 956
 957         protected function lib_isem($value) {
 958                 return $this->toBool($value[0] == "number" && $value[2] == "em");
 959         }
 960
 961         protected function lib_isrem($value) {
 962                 return $this->toBool($value[0] == "number" && $value[2] == "rem");
 963         }
 964
 965         protected function lib_rgbahex($color) {
 966                 $color = $this->coerceColor($color);
 967                 if (is_null($color))
 968                         $this->throwError("color expected for rgbahex");
 969
 970                 return sprintf("#%02x%02x%02x%02x",
 971                         isset($color[4]) ? $color[4]*255 : 255,
 972                         $color[1],$color[2], $color[3]);
 973         }
 974
 975         protected function lib_argb($color){
 976                 return $this->lib_rgbahex($color);
 977         }
 978
 979         // utility func to unquote a string
 980         protected function lib_e($arg) {
 981                 switch ($arg[0]) {
 982                         case "list":
 983                                 $items = $arg[2];
 984                                 if (isset($items[0])) {
 985                                         return $this->lib_e($items[0]);
 986                                 }
 987                                 $this->throwError("unrecognised input");
 988                         case "string":
 989                                 $arg[1] = "";
 990                                 return $arg;
 991                         case "keyword":
 992                                 return $arg;
 993                         default:
 994                                 return array("keyword", $this->compileValue($arg));
 995                 }
 996         }
 997
 998         protected function lib__sprintf($args) {
 999                 if ($args[0] != "list") return $args;
1000                 $values = $args[2];
1001                 $string = array_shift($values);
1002                 $template = $this->compileValue($this->lib_e($string));
1003
1004                 $i = 0;
1005                 if (preg_match_all('/%[dsa]/', $template, $m)) {
1006                         foreach ($m[0] as $match) {
1007                                 $val = isset($values[$i]) ?
1008                                         $this->reduce($values[$i]) : array('keyword', '');
1009
1010                                 // lessjs compat, renders fully expanded color, not raw color
1011                                 if ($color = $this->coerceColor($val)) {
1012                                         $val = $color;
1013                                 }
1014
1015                                 $i++;
1016                                 $rep = $this->compileValue($this->lib_e($val));
1017                                 $template = preg_replace('/'.self::preg_quote($match).'/',
1018                                         $rep, $template, 1);
1019                         }
1020                 }
1021
1022                 $d = $string[0] == "string" ? $string[1] : '"';
1023                 return array("string", $d, array($template));
1024         }
1025
1026         protected function lib_floor($arg) {
1027                 $value = $this->assertNumber($arg);
1028                 return array("number", floor($value), $arg[2]);
1029         }
1030
1031         protected function lib_ceil($arg) {
1032                 $value = $this->assertNumber($arg);
1033                 return array("number", ceil($value), $arg[2]);
1034         }
1035
1036         protected function lib_round($arg) {
1037                 if($arg[0] != "list") {
1038                         $value = $this->assertNumber($arg);
1039                         return array("number", round($value), $arg[2]);
1040                 } else {
1041                         $value = $this->assertNumber($arg[2][0]);
1042                         $precision = $this->assertNumber($arg[2][1]);
1043                         return array("number", round($value, $precision), $arg[2][0][2]);
1044                 }
1045         }
1046
1047         protected function lib_unit($arg) {
1048                 if ($arg[0] == "list") {
1049                         list($number, $newUnit) = $arg[2];
1050                         return array("number", $this->assertNumber($number),
1051                                 $this->compileValue($this->lib_e($newUnit)));
1052                 } else {
1053                         return array("number", $this->assertNumber($arg), "");
1054                 }
1055         }
1056
1057         /**
1058          * Helper function to get arguments for color manipulation functions.
1059          * takes a list that contains a color like thing and a percentage
1060          */
1061         protected function colorArgs($args) {
1062                 if ($args[0] != 'list' || count($args[2]) < 2) {
1063                         return array(array('color', 0, 0, 0), 0);
1064                 }
1065                 list($color, $delta) = $args[2];
1066                 $color = $this->assertColor($color);
1067                 $delta = floatval($delta[1]);
1068
1069                 return array($color, $delta);
1070         }
1071
1072         protected function lib_darken($args) {
1073                 list($color, $delta) = $this->colorArgs($args);
1074
1075                 $hsl = $this->toHSL($color);
1076                 $hsl[3] = $this->clamp($hsl[3] - $delta, 100);
1077                 return $this->toRGB($hsl);
1078         }
1079
1080         protected function lib_lighten($args) {
1081                 list($color, $delta) = $this->colorArgs($args);
1082
1083                 $hsl = $this->toHSL($color);
1084                 $hsl[3] = $this->clamp($hsl[3] + $delta, 100);
1085                 return $this->toRGB($hsl);
1086         }
1087
1088         protected function lib_saturate($args) {
1089                 list($color, $delta) = $this->colorArgs($args);
1090
1091                 $hsl = $this->toHSL($color);
1092                 $hsl[2] = $this->clamp($hsl[2] + $delta, 100);
1093                 return $this->toRGB($hsl);
1094         }
1095
1096         protected function lib_desaturate($args) {
1097                 list($color, $delta) = $this->colorArgs($args);
1098
1099                 $hsl = $this->toHSL($color);
1100                 $hsl[2] = $this->clamp($hsl[2] - $delta, 100);
1101                 return $this->toRGB($hsl);
1102         }
1103
1104         protected function lib_spin($args) {
1105                 list($color, $delta) = $this->colorArgs($args);
1106
1107                 $hsl = $this->toHSL($color);
1108
1109                 $hsl[1] = $hsl[1] + $delta % 360;
1110                 if ($hsl[1] < 0) $hsl[1] += 360;
1111
1112                 return $this->toRGB($hsl);
1113         }
1114
1115         protected function lib_fadeout($args) {
1116                 list($color, $delta) = $this->colorArgs($args);
1117                 $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
1118                 return $color;
1119         }
1120
1121         protected function lib_fadein($args) {
1122                 list($color, $delta) = $this->colorArgs($args);
1123                 $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
1124                 return $color;
1125         }
1126
1127         protected function lib_hue($color) {
1128                 $hsl = $this->toHSL($this->assertColor($color));
1129                 return round($hsl[1]);
1130         }
1131
1132         protected function lib_saturation($color) {
1133                 $hsl = $this->toHSL($this->assertColor($color));
1134                 return round($hsl[2]);
1135         }
1136
1137         protected function lib_lightness($color) {
1138                 $hsl = $this->toHSL($this->assertColor($color));
1139                 return round($hsl[3]);
1140         }
1141
1142         // get the alpha of a color
1143         // defaults to 1 for non-colors or colors without an alpha
1144         protected function lib_alpha($value) {
1145                 if (!is_null($color = $this->coerceColor($value))) {
1146                         return isset($color[4]) ? $color[4] : 1;
1147                 }
1148         }
1149
1150         // set the alpha of the color
1151         protected function lib_fade($args) {
1152                 list($color, $alpha) = $this->colorArgs($args);
1153                 $color[4] = $this->clamp($alpha / 100.0);
1154                 return $color;
1155         }
1156
1157         protected function lib_percentage($arg) {
1158                 $num = $this->assertNumber($arg);
1159                 return array("number", $num*100, "%");
1160         }
1161
1162         // mixes two colors by weight
1163         // mix(@color1, @color2, [@weight: 50%]);
1164         // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
1165         protected function lib_mix($args) {
1166                 if ($args[0] != "list" || count($args[2]) < 2)
1167                         $this->throwError("mix expects (color1, color2, weight)");
1168
1169                 list($first, $second) = $args[2];
1170                 $first = $this->assertColor($first);
1171                 $second = $this->assertColor($second);
1172
1173                 $first_a = $this->lib_alpha($first);
1174                 $second_a = $this->lib_alpha($second);
1175
1176                 if (isset($args[2][2])) {
1177                         $weight = $args[2][2][1] / 100.0;
1178                 } else {
1179                         $weight = 0.5;
1180                 }
1181
1182                 $w = $weight * 2 - 1;
1183                 $a = $first_a - $second_a;
1184
1185                 $w1 = (($w * $a == -1 ? $w : ($w + $a)/(1 + $w * $a)) + 1) / 2.0;
1186                 $w2 = 1.0 - $w1;
1187
1188                 $new = array('color',
1189                         $w1 * $first[1] + $w2 * $second[1],
1190                         $w1 * $first[2] + $w2 * $second[2],
1191                         $w1 * $first[3] + $w2 * $second[3],
1192                 );
1193
1194                 if ($first_a != 1.0 || $second_a != 1.0) {
1195                         $new[] = $first_a * $weight + $second_a * ($weight - 1);
1196                 }
1197
1198                 return $this->fixColor($new);
1199         }
1200
1201         protected function lib_contrast($args) {
1202                 if ($args[0] != 'list' || count($args[2]) < 3) {
1203                         return array(array('color', 0, 0, 0), 0);
1204                 }
1205
1206                 list($inputColor, $darkColor, $lightColor) = $args[2];
1207
1208                 $inputColor = $this->assertColor($inputColor);
1209                 $darkColor = $this->assertColor($darkColor);
1210                 $lightColor = $this->assertColor($lightColor);
1211                 $hsl = $this->toHSL($inputColor);
1212
1213                 if ($hsl[3] > 50) {
1214                         return $darkColor;
1215                 }
1216
1217                 return $lightColor;
1218         }
1219
1220         protected function assertColor($value, $error = "expected color value") {
1221                 $color = $this->coerceColor($value);
1222                 if (is_null($color)) $this->throwError($error);
1223                 return $color;
1224         }
1225
1226         protected function assertNumber($value, $error = "expecting number") {
1227                 if ($value[0] == "number") return $value[1];
1228                 $this->throwError($error);
1229         }
1230
1231         protected function assertArgs($value, $expectedArgs, $name="") {
1232                 if ($expectedArgs == 1) {
1233                         return $value;
1234                 } else {
1235                         if ($value[0] !== "list" || $value[1] != ",") $this->throwError("expecting list");
1236                         $values = $value[2];
1237                         $numValues = count($values);
1238                         if ($expectedArgs != $numValues) {
1239                                 if ($name) {
1240                                         $name = $name . ": ";
1241                                 }
1242
1243                                 $this->throwError("${name}expecting $expectedArgs arguments, got $numValues");
1244                         }
1245
1246                         return $values;
1247                 }
1248         }
1249
1250         protected function toHSL($color) {
1251                 if ($color[0] == 'hsl') return $color;
1252
1253                 $r = $color[1] / 255;
1254                 $g = $color[2] / 255;
1255                 $b = $color[3] / 255;
1256
1257                 $min = min($r, $g, $b);
1258                 $max = max($r, $g, $b);
1259
1260                 $L = ($min + $max) / 2;
1261                 if ($min == $max) {
1262                         $S = $H = 0;
1263                 } else {
1264                         if ($L < 0.5)
1265                                 $S = ($max - $min)/($max + $min);
1266                         else
1267                                 $S = ($max - $min)/(2.0 - $max - $min);
1268
1269                         if ($r == $max) $H = ($g - $b)/($max - $min);
1270                         elseif ($g == $max) $H = 2.0 + ($b - $r)/($max - $min);
1271                         elseif ($b == $max) $H = 4.0 + ($r - $g)/($max - $min);
1272
1273                 }
1274
1275                 $out = array('hsl',
1276                         ($H < 0 ? $H + 6 : $H)*60,
1277                         $S*100,
1278                         $L*100,
1279                 );
1280
1281                 if (count($color) > 4) $out[] = $color[4]; // copy alpha
1282                 return $out;
1283         }
1284
1285         protected function toRGB_helper($comp, $temp1, $temp2) {
1286                 if ($comp < 0) $comp += 1.0;
1287                 elseif ($comp > 1) $comp -= 1.0;
1288
1289                 if (6 * $comp < 1) return $temp1 + ($temp2 - $temp1) * 6 * $comp;
1290                 if (2 * $comp < 1) return $temp2;
1291                 if (3 * $comp < 2) return $temp1 + ($temp2 - $temp1)*((2/3) - $comp) * 6;
1292
1293                 return $temp1;
1294         }
1295
1296         /**
1297          * Converts a hsl array into a color value in rgb.
1298          * Expects H to be in range of 0 to 360, S and L in 0 to 100
1299          */
1300         protected function toRGB($color) {
1301                 if ($color[0] == 'color') return $color;
1302
1303                 $H = $color[1] / 360;
1304                 $S = $color[2] / 100;
1305                 $L = $color[3] / 100;
1306
1307                 if ($S == 0) {
1308                         $r = $g = $b = $L;
1309                 } else {
1310                         $temp2 = $L < 0.5 ?
1311                                 $L*(1.0 + $S) :
1312                                 $L + $S - $L * $S;
1313
1314                         $temp1 = 2.0 * $L - $temp2;
1315
1316                         $r = $this->toRGB_helper($H + 1/3, $temp1, $temp2);
1317                         $g = $this->toRGB_helper($H, $temp1, $temp2);
1318                         $b = $this->toRGB_helper($H - 1/3, $temp1, $temp2);
1319                 }
1320
1321                 // $out = array('color', round($r*255), round($g*255), round($b*255));
1322                 $out = array('color', $r*255, $g*255, $b*255);
1323                 if (count($color) > 4) $out[] = $color[4]; // copy alpha
1324                 return $out;
1325         }
1326
1327         protected function clamp($v, $max = 1, $min = 0) {
1328                 return min($max, max($min, $v));
1329         }
1330
1331         /**
1332          * Convert the rgb, rgba, hsl color literals of function type
1333          * as returned by the parser into values of color type.
1334          */
1335         protected function funcToColor($func) {
1336                 $fname = $func[1];
1337                 if ($func[2][0] != 'list') return false; // need a list of arguments
1338                 $rawComponents = $func[2][2];
1339
1340                 if ($fname == 'hsl' || $fname == 'hsla') {
1341                         $hsl = array('hsl');
1342                         $i = 0;
1343                         foreach ($rawComponents as $c) {
1344                                 $val = $this->reduce($c);
1345                                 $val = isset($val[1]) ? floatval($val[1]) : 0;
1346
1347                                 if ($i == 0) $clamp = 360;
1348                                 elseif ($i < 3) $clamp = 100;
1349                                 else $clamp = 1;
1350
1351                                 $hsl[] = $this->clamp($val, $clamp);
1352                                 $i++;
1353                         }
1354
1355                         while (count($hsl) < 4) $hsl[] = 0;
1356                         return $this->toRGB($hsl);
1357
1358                 } elseif ($fname == 'rgb' || $fname == 'rgba') {
1359                         $components = array();
1360                         $i = 1;
1361                         foreach ($rawComponents as $c) {
1362                                 $c = $this->reduce($c);
1363                                 if ($i < 4) {
1364                                         if ($c[0] == "number" && $c[2] == "%") {
1365                                                 $components[] = 255 * ($c[1] / 100);
1366                                         } else {
1367                                                 $components[] = floatval($c[1]);
1368                                         }
1369                                 } elseif ($i == 4) {
1370                                         if ($c[0] == "number" && $c[2] == "%") {
1371                                                 $components[] = 1.0 * ($c[1] / 100);
1372                                         } else {
1373                                                 $components[] = floatval($c[1]);
1374                                         }
1375                                 } else break;
1376
1377                                 $i++;
1378                         }
1379                         while (count($components) < 3) $components[] = 0;
1380                         array_unshift($components, 'color');
1381                         return $this->fixColor($components);
1382                 }
1383
1384                 return false;
1385         }
1386
1387         protected function reduce($value, $forExpression = false) {
1388                 switch ($value[0]) {
1389                 case "interpolate":
1390                         $reduced = $this->reduce($value[1]);
1391                         $var = $this->compileValue($reduced);
1392                         $res = $this->reduce(array("variable", $this->vPrefix . $var));
1393
1394                         if ($res[0] == "raw_color") {
1395                                 $res = $this->coerceColor($res);
1396                         }
1397
1398                         if (empty($value[2])) $res = $this->lib_e($res);
1399
1400                         return $res;
1401                 case "variable":
1402                         $key = $value[1];
1403                         if (is_array($key)) {
1404                                 $key = $this->reduce($key);
1405                                 $key = $this->vPrefix . $this->compileValue($this->lib_e($key));
1406                         }
1407
1408                         $seen =& $this->env->seenNames;
1409
1410                         if (!empty($seen[$key])) {
1411                                 $this->throwError("infinite loop detected: $key");
1412                         }
1413
1414                         $seen[$key] = true;
1415                         $out = $this->reduce($this->get($key));
1416                         $seen[$key] = false;
1417                         return $out;
1418                 case "list":
1419                         foreach ($value[2] as &$item) {
1420                                 $item = $this->reduce($item, $forExpression);
1421                         }
1422                         return $value;
1423                 case "expression":
1424                         return $this->evaluate($value);
1425                 case "string":
1426                         foreach ($value[2] as &$part) {
1427                                 if (is_array($part)) {
1428                                         $strip = $part[0] == "variable";
1429                                         $part = $this->reduce($part);
1430                                         if ($strip) $part = $this->lib_e($part);
1431                                 }
1432                         }
1433                         return $value;
1434                 case "escape":
1435                         list(,$inner) = $value;
1436                         return $this->lib_e($this->reduce($inner));
1437                 case "function":
1438                         $color = $this->funcToColor($value);
1439                         if ($color) return $color;
1440
1441                         list(, $name, $args) = $value;
1442                         if ($name == "%") $name = "_sprintf";
1443                         $f = isset($this->libFunctions[$name]) ?
1444                                 $this->libFunctions[$name] : array($this, 'lib_'.$name);
1445
1446                         if (is_callable($f)) {
1447                                 if ($args[0] == 'list')
1448                                         $args = self::compressList($args[2], $args[1]);
1449
1450                                 $ret = call_user_func($f, $this->reduce($args, true), $this);
1451
1452                                 if (is_null($ret)) {
1453                                         return array("string", "", array(
1454                                                 $name, "(", $args, ")"
1455                                         ));
1456                                 }
1457
1458                                 // convert to a typed value if the result is a php primitive
1459                                 if (is_numeric($ret)) $ret = array('number', $ret, "");
1460                                 elseif (!is_array($ret)) $ret = array('keyword', $ret);
1461
1462                                 return $ret;
1463                         }
1464
1465                         // plain function, reduce args
1466                         $value[2] = $this->reduce($value[2]);
1467                         return $value;
1468                 case "unary":
1469                         list(, $op, $exp) = $value;
1470                         $exp = $this->reduce($exp);
1471
1472                         if ($exp[0] == "number") {
1473                                 switch ($op) {
1474                                 case "+":
1475                                         return $exp;
1476                                 case "-":
1477                                         $exp[1] *= -1;
1478                                         return $exp;
1479                                 }
1480                         }
1481                         return array("string", "", array($op, $exp));
1482                 }
1483
1484                 if ($forExpression) {
1485                         switch ($value[0]) {
1486                         case "keyword":
1487                                 if ($color = $this->coerceColor($value)) {
1488                                         return $color;
1489                                 }
1490                                 break;
1491                         case "raw_color":
1492                                 return $this->coerceColor($value);
1493                         }
1494                 }
1495
1496                 return $value;
1497         }
1498
1499
1500         // coerce a value for use in color operation
1501         protected function coerceColor($value) {
1502                 switch($value[0]) {
1503                         case 'color': return $value;
1504                         case 'raw_color':
1505                                 $c = array("color", 0, 0, 0);
1506                                 $colorStr = substr($value[1], 1);
1507                                 $num = hexdec($colorStr);
1508                                 $width = strlen($colorStr) == 3 ? 16 : 256;
1509
1510                                 for ($i = 3; $i > 0; $i--) { // 3 2 1
1511                                         $t = $num % $width;
1512                                         $num /= $width;
1513
1514                                         $c[$i] = $t * (256/$width) + $t * floor(16/$width);
1515                                 }
1516
1517                                 return $c;
1518                         case 'keyword':
1519                                 $name = $value[1];
1520                                 if (isset(self::$cssColors[$name])) {
1521                                         $rgba = explode(',', self::$cssColors[$name]);
1522
1523                                         if(isset($rgba[3]))
1524                                                 return array('color', $rgba[0], $rgba[1], $rgba[2], $rgba[3]);
1525
1526                                         return array('color', $rgba[0], $rgba[1], $rgba[2]);
1527                                 }
1528                                 return null;
1529                 }
1530         }
1531
1532         // make something string like into a string
1533         protected function coerceString($value) {
1534                 switch ($value[0]) {
1535                 case "string":
1536                         return $value;
1537                 case "keyword":
1538                         return array("string", "", array($value[1]));
1539                 }
1540                 return null;
1541         }
1542
1543         // turn list of length 1 into value type
1544         protected function flattenList($value) {
1545                 if ($value[0] == "list" && count($value[2]) == 1) {
1546                         return $this->flattenList($value[2][0]);
1547                 }
1548                 return $value;
1549         }
1550
1551         protected function toBool($a) {
1552                 if ($a) return self::$TRUE;
1553                 else return self::$FALSE;
1554         }
1555
1556         // evaluate an expression
1557         protected function evaluate($exp) {
1558                 list(, $op, $left, $right, $whiteBefore, $whiteAfter) = $exp;
1559
1560                 $left = $this->reduce($left, true);
1561                 $right = $this->reduce($right, true);
1562
1563                 if ($leftColor = $this->coerceColor($left)) {
1564                         $left = $leftColor;
1565                 }
1566
1567                 if ($rightColor = $this->coerceColor($right)) {
1568                         $right = $rightColor;
1569                 }
1570
1571                 $ltype = $left[0];
1572                 $rtype = $right[0];
1573
1574                 // operators that work on all types
1575                 if ($op == "and") {
1576                         return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
1577                 }
1578
1579                 if ($op == "=") {
1580                         return $this->toBool($this->eq($left, $right) );
1581                 }
1582
1583                 if ($op == "+" && !is_null($str = $this->stringConcatenate($left, $right))) {
1584                         return $str;
1585                 }
1586
1587                 // type based operators
1588                 $fname = "op_${ltype}_${rtype}";
1589                 if (is_callable(array($this, $fname))) {
1590                         $out = $this->$fname($op, $left, $right);
1591                         if (!is_null($out)) return $out;
1592                 }
1593
1594                 // make the expression look it did before being parsed
1595                 $paddedOp = $op;
1596                 if ($whiteBefore) $paddedOp = " " . $paddedOp;
1597                 if ($whiteAfter) $paddedOp .= " ";
1598
1599                 return array("string", "", array($left, $paddedOp, $right));
1600         }
1601
1602         protected function stringConcatenate($left, $right) {
1603                 if ($strLeft = $this->coerceString($left)) {
1604                         if ($right[0] == "string") {
1605                                 $right[1] = "";
1606                         }
1607                         $strLeft[2][] = $right;
1608                         return $strLeft;
1609                 }
1610
1611                 if ($strRight = $this->coerceString($right)) {
1612                         array_unshift($strRight[2], $left);
1613                         return $strRight;
1614                 }
1615         }
1616
1617
1618         // make sure a color's components don't go out of bounds
1619         protected function fixColor($c) {
1620                 foreach (range(1, 3) as $i) {
1621                         if ($c[$i] < 0) $c[$i] = 0;
1622                         if ($c[$i] > 255) $c[$i] = 255;
1623                 }
1624
1625                 return $c;
1626         }
1627
1628         protected function op_number_color($op, $lft, $rgt) {
1629                 if ($op == '+' || $op == '*') {
1630                         return $this->op_color_number($op, $rgt, $lft);
1631                 }
1632         }
1633
1634         protected function op_color_number($op, $lft, $rgt) {
1635                 if ($rgt[0] == '%') $rgt[1] /= 100;
1636
1637                 return $this->op_color_color($op, $lft,
1638                         array_fill(1, count($lft) - 1, $rgt[1]));
1639         }
1640
1641         protected function op_color_color($op, $left, $right) {
1642                 $out = array('color');
1643                 $max = count($left) > count($right) ? count($left) : count($right);
1644                 foreach (range(1, $max - 1) as $i) {
1645                         $lval = isset($left[$i]) ? $left[$i] : 0;
1646                         $rval = isset($right[$i]) ? $right[$i] : 0;
1647                         switch ($op) {
1648                         case '+':
1649                                 $out[] = $lval + $rval;
1650                                 break;
1651                         case '-':
1652                                 $out[] = $lval - $rval;
1653                                 break;
1654                         case '*':
1655                                 $out[] = $lval * $rval;
1656                                 break;
1657                         case '%':
1658                                 $out[] = $lval % $rval;
1659                                 break;
1660                         case '/':
1661                                 if ($rval == 0) $this->throwError("evaluate error: can't divide by zero");
1662                                 $out[] = $lval / $rval;
1663                                 break;
1664                         default:
1665                                 $this->throwError('evaluate error: color op number failed on op '.$op);
1666                         }
1667                 }
1668                 return $this->fixColor($out);
1669         }
1670
1671         function lib_red($color){
1672                 $color = $this->coerceColor($color);
1673                 if (is_null($color)) {
1674                         $this->throwError('color expected for red()');
1675                 }
1676
1677                 return $color[1];
1678         }
1679
1680         function lib_green($color){
1681                 $color = $this->coerceColor($color);
1682                 if (is_null($color)) {
1683                         $this->throwError('color expected for green()');
1684                 }
1685
1686                 return $color[2];
1687         }
1688
1689         function lib_blue($color){
1690                 $color = $this->coerceColor($color);
1691                 if (is_null($color)) {
1692                         $this->throwError('color expected for blue()');
1693                 }
1694
1695                 return $color[3];
1696         }
1697
1698
1699         // operator on two numbers
1700         protected function op_number_number($op, $left, $right) {
1701                 $unit = empty($left[2]) ? $right[2] : $left[2];
1702
1703                 $value = 0;
1704                 switch ($op) {
1705                 case '+':
1706                         $value = $left[1] + $right[1];
1707                         break;
1708                 case '*':
1709                         $value = $left[1] * $right[1];
1710                         break;
1711                 case '-':
1712                         $value = $left[1] - $right[1];
1713                         break;
1714                 case '%':
1715                         $value = $left[1] % $right[1];
1716                         break;
1717                 case '/':
1718                         if ($right[1] == 0) $this->throwError('parse error: divide by zero');
1719                         $value = $left[1] / $right[1];
1720                         break;
1721                 case '<':
1722                         return $this->toBool($left[1] < $right[1]);
1723                 case '>':
1724                         return $this->toBool($left[1] > $right[1]);
1725                 case '>=':
1726                         return $this->toBool($left[1] >= $right[1]);
1727                 case '=<':
1728                         return $this->toBool($left[1] <= $right[1]);
1729                 default:
1730                         $this->throwError('parse error: unknown number operator: '.$op);
1731                 }
1732
1733                 return array("number", $value, $unit);
1734         }
1735
1736
1737         /* environment functions */
1738
1739         protected function makeOutputBlock($type, $selectors = null) {
1740                 $b = new stdclass;
1741                 $b->lines = array();
1742                 $b->children = array();
1743                 $b->selectors = $selectors;
1744                 $b->type = $type;
1745                 $b->parent = $this->scope;
1746                 return $b;
1747         }
1748
1749         // the state of execution
1750         protected function pushEnv($block = null) {
1751                 $e = new stdclass;
1752                 $e->parent = $this->env;
1753                 $e->store = array();
1754                 $e->block = $block;
1755
1756                 $this->env = $e;
1757                 return $e;
1758         }
1759
1760         // pop something off the stack
1761         protected function popEnv() {
1762                 $old = $this->env;
1763                 $this->env = $this->env->parent;
1764                 return $old;
1765         }
1766
1767         // set something in the current env
1768         protected function set($name, $value) {
1769                 $this->env->store[$name] = $value;
1770         }
1771
1772
1773         // get the highest occurrence entry for a name
1774         protected function get($name) {
1775                 $current = $this->env;
1776
1777                 $isArguments = $name == $this->vPrefix . 'arguments';
1778                 while ($current) {
1779                         if ($isArguments && isset($current->arguments)) {
1780                                 return array('list', ' ', $current->arguments);
1781                         }
1782
1783                         if (isset($current->store[$name]))
1784                                 return $current->store[$name];
1785                         else {
1786                                 $current = isset($current->storeParent) ?
1787                                         $current->storeParent : $current->parent;
1788                         }
1789                 }
1790
1791                 $this->throwError("variable $name is undefined");
1792         }
1793
1794         // inject array of unparsed strings into environment as variables
1795         protected function injectVariables($args) {
1796                 $this->pushEnv();
1797                 $parser = new lessc_parser($this, __METHOD__);
1798                 foreach ($args as $name => $strValue) {
1799                         if ($name{0} != '@') $name = '@'.$name;
1800                         $parser->count = 0;
1801                         $parser->buffer = (string)$strValue;
1802                         if (!$parser->propertyValue($value)) {
1803                                 throw new Exception("failed to parse passed in variable $name: $strValue");
1804                         }
1805
1806                         $this->set($name, $value);
1807                 }
1808         }
1809
1810         /**
1811          * Initialize any static state, can initialize parser for a file
1812          * $opts isn't used yet
1813          */
1814         public function __construct($fname = null) {
1815                 if ($fname !== null) {
1816                         // used for deprecated parse method
1817                         $this->_parseFile = $fname;
1818                 }
1819         }
1820
1821         public function compile($string, $name = null) {
1822                 $locale = setlocale(LC_NUMERIC, 0);
1823                 setlocale(LC_NUMERIC, "C");
1824
1825                 $this->parser = $this->makeParser($name);
1826                 $root = $this->parser->parse($string);
1827
1828                 $this->env = null;
1829                 $this->scope = null;
1830
1831                 $this->formatter = $this->newFormatter();
1832
1833                 if (!empty($this->registeredVars)) {
1834                         $this->injectVariables($this->registeredVars);
1835                 }
1836
1837                 $this->sourceParser = $this->parser; // used for error messages
1838                 $this->compileBlock($root);
1839
1840                 ob_start();
1841                 $this->formatter->block($this->scope);
1842                 $out = ob_get_clean();
1843                 setlocale(LC_NUMERIC, $locale);
1844                 return $out;
1845         }
1846
1847         public function compileFile($fname, $outFname = null) {
1848                 if (!is_readable($fname)) {
1849                         throw new Exception('load error: failed to find '.$fname);
1850                 }
1851
1852                 $pi = pathinfo($fname);
1853
1854                 $oldImport = $this->importDir;
1855
1856                 $this->importDir = (array)$this->importDir;
1857                 $this->importDir[] = $pi['dirname'].'/';
1858
1859                 $this->addParsedFile($fname);
1860
1861                 $out = $this->compile(file_get_contents($fname), $fname);
1862
1863                 $this->importDir = $oldImport;
1864
1865                 if ($outFname !== null) {
1866                         return file_put_contents($outFname, $out);
1867                 }
1868
1869                 return $out;
1870         }
1871
1872         // compile only if changed input has changed or output doesn't exist
1873         public function checkedCompile($in, $out) {
1874                 if (!is_file($out) || filemtime($in) > filemtime($out)) {
1875                         $this->compileFile($in, $out);
1876                         return true;
1877                 }
1878                 return false;
1879         }
1880
1881         /**
1882          * Execute lessphp on a .less file or a lessphp cache structure
1883          *
1884          * The lessphp cache structure contains information about a specific
1885          * less file having been parsed. It can be used as a hint for future
1886          * calls to determine whether or not a rebuild is required.
1887          *
1888          * The cache structure contains two important keys that may be used
1889          * externally:
1890          *
1891          * compiled: The final compiled CSS
1892          * updated: The time (in seconds) the CSS was last compiled
1893          *
1894          * The cache structure is a plain-ol' PHP associative array and can
1895          * be serialized and unserialized without a hitch.
1896          *
1897          * @param mixed $in Input
1898          * @param bool $force Force rebuild?
1899          * @return array lessphp cache structure
1900          */
1901         public function cachedCompile($in, $force = false) {
1902                 // assume no root
1903                 $root = null;
1904
1905                 if (is_string($in)) {
1906                         $root = $in;
1907                 } elseif (is_array($in) and isset($in['root'])) {
1908                         if ($force or ! isset($in['files'])) {
1909                                 // If we are forcing a recompile or if for some reason the
1910                                 // structure does not contain any file information we should
1911                                 // specify the root to trigger a rebuild.
1912                                 $root = $in['root'];
1913                         } elseif (isset($in['files']) and is_array($in['files'])) {
1914                                 foreach ($in['files'] as $fname => $ftime ) {
1915                                         if (!file_exists($fname) or filemtime($fname) > $ftime) {
1916                                                 // One of the files we knew about previously has changed
1917                                                 // so we should look at our incoming root again.
1918                                                 $root = $in['root'];
1919                                                 break;
1920                                         }
1921                                 }
1922                         }
1923                 } else {
1924                         // TODO: Throw an exception? We got neither a string nor something
1925                         // that looks like a compatible lessphp cache structure.
1926                         return null;
1927                 }
1928
1929                 if ($root !== null) {
1930                         // If we have a root value which means we should rebuild.
1931                         $out = array();
1932                         $out['root'] = $root;
1933                         $out['compiled'] = $this->compileFile($root);
1934                         $out['files'] = $this->allParsedFiles();
1935                         $out['updated'] = time();
1936                         return $out;
1937                 } else {
1938                         // No changes, pass back the structure
1939                         // we were given initially.
1940                         return $in;
1941                 }
1942
1943         }
1944
1945         // parse and compile buffer
1946         // This is deprecated
1947         public function parse($str = null, $initialVariables = null) {
1948                 if (is_array($str)) {
1949                         $initialVariables = $str;
1950                         $str = null;
1951                 }
1952
1953                 $oldVars = $this->registeredVars;
1954                 if ($initialVariables !== null) {
1955                         $this->setVariables($initialVariables);
1956                 }
1957
1958                 if ($str == null) {
1959                         if (empty($this->_parseFile)) {
1960                                 throw new exception("nothing to parse");
1961                         }
1962
1963                         $out = $this->compileFile($this->_parseFile);
1964                 } else {
1965                         $out = $this->compile($str);
1966                 }
1967
1968                 $this->registeredVars = $oldVars;
1969                 return $out;
1970         }
1971
1972         protected function makeParser($name) {
1973                 $parser = new lessc_parser($this, $name);
1974                 $parser->writeComments = $this->preserveComments;
1975
1976                 return $parser;
1977         }
1978
1979         public function setFormatter($name) {
1980                 $this->formatterName = $name;
1981         }
1982
1983         protected function newFormatter() {
1984                 $className = "lessc_formatter_lessjs";
1985                 if (!empty($this->formatterName)) {
1986                         if (!is_string($this->formatterName))
1987                                 return $this->formatterName;
1988                         $className = "lessc_formatter_$this->formatterName";
1989                 }
1990
1991                 return new $className;
1992         }
1993
1994         public function setPreserveComments($preserve) {
1995                 $this->preserveComments = $preserve;
1996         }
1997
1998         public function registerFunction($name, $func) {
1999                 $this->libFunctions[$name] = $func;
2000         }
2001
2002         public function unregisterFunction($name) {
2003                 unset($this->libFunctions[$name]);
2004         }
2005
2006         public function setVariables($variables) {
2007                 $this->registeredVars = array_merge($this->registeredVars, $variables);
2008         }
2009
2010         public function unsetVariable($name) {
2011                 unset($this->registeredVars[$name]);
2012         }
2013
2014         public function setImportDir($dirs) {
2015                 $this->importDir = (array)$dirs;
2016         }
2017
2018         public function addImportDir($dir) {
2019                 $this->importDir = (array)$this->importDir;
2020                 $this->importDir[] = $dir;
2021         }
2022
2023         public function allParsedFiles() {
2024                 return $this->allParsedFiles;
2025         }
2026
2027         public function addParsedFile($file) {
2028                 $this->allParsedFiles[realpath($file)] = filemtime($file);
2029         }
2030
2031         /**
2032          * Uses the current value of $this->count to show line and line number
2033          */
2034         protected function throwError($msg = null) {
2035                 if ($this->sourceLoc >= 0) {
2036                         $this->sourceParser->throwError($msg, $this->sourceLoc);
2037                 }
2038                 throw new exception($msg);
2039         }
2040
2041         // compile file $in to file $out if $in is newer than $out
2042         // returns true when it compiles, false otherwise
2043         public static function ccompile($in, $out, $less = null) {
2044                 if ($less === null) {
2045                         $less = new self;
2046                 }
2047                 return $less->checkedCompile($in, $out);
2048         }
2049
2050         public static function cexecute($in, $force = false, $less = null) {
2051                 if ($less === null) {
2052                         $less = new self;
2053                 }
2054                 return $less->cachedCompile($in, $force);
2055         }
2056
2057         static protected $cssColors = array(
2058                 'aliceblue' => '240,248,255',
2059                 'antiquewhite' => '250,235,215',
2060                 'aqua' => '0,255,255',
2061                 'aquamarine' => '127,255,212',
2062                 'azure' => '240,255,255',
2063                 'beige' => '245,245,220',
2064                 'bisque' => '255,228,196',
2065                 'black' => '0,0,0',
2066                 'blanchedalmond' => '255,235,205',
2067                 'blue' => '0,0,255',
2068                 'blueviolet' => '138,43,226',
2069                 'brown' => '165,42,42',
2070                 'burlywood' => '222,184,135',
2071                 'cadetblue' => '95,158,160',
2072                 'chartreuse' => '127,255,0',
2073                 'chocolate' => '210,105,30',
2074                 'coral' => '255,127,80',
2075                 'cornflowerblue' => '100,149,237',
2076                 'cornsilk' => '255,248,220',
2077                 'crimson' => '220,20,60',
2078                 'cyan' => '0,255,255',
2079                 'darkblue' => '0,0,139',
2080                 'darkcyan' => '0,139,139',
2081                 'darkgoldenrod' => '184,134,11',
2082                 'darkgray' => '169,169,169',
2083                 'darkgreen' => '0,100,0',
2084                 'darkgrey' => '169,169,169',
2085                 'darkkhaki' => '189,183,107',
2086                 'darkmagenta' => '139,0,139',
2087                 'darkolivegreen' => '85,107,47',
2088                 'darkorange' => '255,140,0',
2089                 'darkorchid' => '153,50,204',
2090                 'darkred' => '139,0,0',
2091                 'darksalmon' => '233,150,122',
2092                 'darkseagreen' => '143,188,143',
2093                 'darkslateblue' => '72,61,139',
2094                 'darkslategray' => '47,79,79',
2095                 'darkslategrey' => '47,79,79',
2096                 'darkturquoise' => '0,206,209',
2097                 'darkviolet' => '148,0,211',
2098                 'deeppink' => '255,20,147',
2099                 'deepskyblue' => '0,191,255',
2100                 'dimgray' => '105,105,105',
2101                 'dimgrey' => '105,105,105',
2102                 'dodgerblue' => '30,144,255',
2103                 'firebrick' => '178,34,34',
2104                 'floralwhite' => '255,250,240',
2105                 'forestgreen' => '34,139,34',
2106                 'fuchsia' => '255,0,255',
2107                 'gainsboro' => '220,220,220',
2108                 'ghostwhite' => '248,248,255',
2109                 'gold' => '255,215,0',
2110                 'goldenrod' => '218,165,32',
2111                 'gray' => '128,128,128',
2112                 'green' => '0,128,0',
2113                 'greenyellow' => '173,255,47',
2114                 'grey' => '128,128,128',
2115                 'honeydew' => '240,255,240',
2116                 'hotpink' => '255,105,180',
2117                 'indianred' => '205,92,92',
2118                 'indigo' => '75,0,130',
2119                 'ivory' => '255,255,240',
2120                 'khaki' => '240,230,140',
2121                 'lavender' => '230,230,250',
2122                 'lavenderblush' => '255,240,245',
2123                 'lawngreen' => '124,252,0',
2124                 'lemonchiffon' => '255,250,205',
2125                 'lightblue' => '173,216,230',
2126                 'lightcoral' => '240,128,128',
2127                 'lightcyan' => '224,255,255',
2128                 'lightgoldenrodyellow' => '250,250,210',
2129                 'lightgray' => '211,211,211',
2130                 'lightgreen' => '144,238,144',
2131                 'lightgrey' => '211,211,211',
2132                 'lightpink' => '255,182,193',
2133                 'lightsalmon' => '255,160,122',
2134                 'lightseagreen' => '32,178,170',
2135                 'lightskyblue' => '135,206,250',
2136                 'lightslategray' => '119,136,153',
2137                 'lightslategrey' => '119,136,153',
2138                 'lightsteelblue' => '176,196,222',
2139                 'lightyellow' => '255,255,224',
2140                 'lime' => '0,255,0',
2141                 'limegreen' => '50,205,50',
2142                 'linen' => '250,240,230',
2143                 'magenta' => '255,0,255',
2144                 'maroon' => '128,0,0',
2145                 'mediumaquamarine' => '102,205,170',
2146                 'mediumblue' => '0,0,205',
2147                 'mediumorchid' => '186,85,211',
2148                 'mediumpurple' => '147,112,219',
2149                 'mediumseagreen' => '60,179,113',
2150                 'mediumslateblue' => '123,104,238',
2151                 'mediumspringgreen' => '0,250,154',
2152                 'mediumturquoise' => '72,209,204',
2153                 'mediumvioletred' => '199,21,133',
2154                 'midnightblue' => '25,25,112',
2155                 'mintcream' => '245,255,250',
2156                 'mistyrose' => '255,228,225',
2157                 'moccasin' => '255,228,181',
2158                 'navajowhite' => '255,222,173',
2159                 'navy' => '0,0,128',
2160                 'oldlace' => '253,245,230',
2161                 'olive' => '128,128,0',
2162                 'olivedrab' => '107,142,35',
2163                 'orange' => '255,165,0',
2164                 'orangered' => '255,69,0',
2165                 'orchid' => '218,112,214',
2166                 'palegoldenrod' => '238,232,170',
2167                 'palegreen' => '152,251,152',
2168                 'paleturquoise' => '175,238,238',
2169                 'palevioletred' => '219,112,147',
2170                 'papayawhip' => '255,239,213',
2171                 'peachpuff' => '255,218,185',
2172                 'peru' => '205,133,63',
2173                 'pink' => '255,192,203',
2174                 'plum' => '221,160,221',
2175                 'powderblue' => '176,224,230',
2176                 'purple' => '128,0,128',
2177                 'red' => '255,0,0',
2178                 'rosybrown' => '188,143,143',
2179                 'royalblue' => '65,105,225',
2180                 'saddlebrown' => '139,69,19',
2181                 'salmon' => '250,128,114',
2182                 'sandybrown' => '244,164,96',
2183                 'seagreen' => '46,139,87',
2184                 'seashell' => '255,245,238',
2185                 'sienna' => '160,82,45',
2186                 'silver' => '192,192,192',
2187                 'skyblue' => '135,206,235',
2188                 'slateblue' => '106,90,205',
2189                 'slategray' => '112,128,144',
2190                 'slategrey' => '112,128,144',
2191                 'snow' => '255,250,250',
2192                 'springgreen' => '0,255,127',
2193                 'steelblue' => '70,130,180',
2194                 'tan' => '210,180,140',
2195                 'teal' => '0,128,128',
2196                 'thistle' => '216,191,216',
2197                 'tomato' => '255,99,71',
2198                 'transparent' => '0,0,0,0',
2199                 'turquoise' => '64,224,208',
2200                 'violet' => '238,130,238',
2201                 'wheat' => '245,222,179',
2202                 'white' => '255,255,255',
2203                 'whitesmoke' => '245,245,245',
2204                 'yellow' => '255,255,0',
2205                 'yellowgreen' => '154,205,50'
2206         );
2207 }
2208
2209 // responsible for taking a string of LESS code and converting it into a
2210 // syntax tree
2211 class lessc_parser {
2212         static protected $nextBlockId = 0; // used to uniquely identify blocks
2213
2214         static protected $precedence = array(
2215                 '=<' => 0,
2216                 '>=' => 0,
2217                 '=' => 0,
2218                 '<' => 0,
2219                 '>' => 0,
2220
2221                 '+' => 1,
2222                 '-' => 1,
2223                 '*' => 2,
2224                 '/' => 2,
2225                 '%' => 2,
2226         );
2227
2228         static protected $whitePattern;
2229         static protected $commentMulti;
2230
2231         static protected $commentSingle = "//";
2232         static protected $commentMultiLeft = "/*";
2233         static protected $commentMultiRight = "*/";
2234
2235         // regex string to match any of the operators
2236         static protected $operatorString;
2237
2238         // these properties will supress division unless it's inside parenthases
2239         static protected $supressDivisionProps =
2240                 array('/border-radius$/i', '/^font$/i');
2241
2242         protected $blockDirectives = array("font-face", "keyframes", "page", "-moz-document", "viewport", "-moz-viewport", "-o-viewport", "-ms-viewport");
2243         protected $lineDirectives = array("charset");
2244
2245         /**
2246          * if we are in parens we can be more liberal with whitespace around
2247          * operators because it must evaluate to a single value and thus is less
2248          * ambiguous.
2249          *
2250          * Consider:
2251          *     property1: 10 -5; // is two numbers, 10 and -5
2252          *     property2: (10 -5); // should evaluate to 5
2253          */
2254         protected $inParens = false;
2255
2256         // caches preg escaped literals
2257         static protected $literalCache = array();
2258
2259         public function __construct($lessc, $sourceName = null) {
2260                 $this->eatWhiteDefault = true;
2261                 // reference to less needed for vPrefix, mPrefix, and parentSelector
2262                 $this->lessc = $lessc;
2263
2264                 $this->sourceName = $sourceName; // name used for error messages
2265
2266                 $this->writeComments = false;
2267
2268                 if (!self::$operatorString) {
2269                         self::$operatorString =
2270                                 '('.implode('|', array_map(array('lessc', 'preg_quote'),
2271                                         array_keys(self::$precedence))).')';
2272
2273                         $commentSingle = lessc::preg_quote(self::$commentSingle);
2274                         $commentMultiLeft = lessc::preg_quote(self::$commentMultiLeft);
2275                         $commentMultiRight = lessc::preg_quote(self::$commentMultiRight);
2276
2277                         self::$commentMulti = $commentMultiLeft.'.*?'.$commentMultiRight;
2278                         self::$whitePattern = '/'.$commentSingle.'[^\n]*\s*|('.self::$commentMulti.')\s*|\s+/Ais';
2279                 }
2280         }
2281
2282         public function parse($buffer) {
2283                 $this->count = 0;
2284                 $this->line = 1;
2285
2286                 $this->env = null; // block stack
2287                 $this->buffer = $this->writeComments ? $buffer : $this->removeComments($buffer);
2288                 $this->pushSpecialBlock("root");
2289                 $this->eatWhiteDefault = true;
2290                 $this->seenComments = array();
2291
2292                 // trim whitespace on head
2293                 // if (preg_match('/^\s+/', $this->buffer, $m)) {
2294                 //      $this->line += substr_count($m[0], "\n");
2295                 //      $this->buffer = ltrim($this->buffer);
2296                 // }
2297                 $this->whitespace();
2298
2299                 // parse the entire file
2300                 $lastCount = $this->count;
2301                 while (false !== $this->parseChunk());
2302
2303                 if ($this->count != strlen($this->buffer))
2304                         $this->throwError();
2305
2306                 // TODO report where the block was opened
2307                 if (!is_null($this->env->parent))
2308                         throw new exception('parse error: unclosed block');
2309
2310                 return $this->env;
2311         }
2312
2313         /**
2314          * Parse a single chunk off the head of the buffer and append it to the
2315          * current parse environment.
2316          * Returns false when the buffer is empty, or when there is an error.
2317          *
2318          * This function is called repeatedly until the entire document is
2319          * parsed.
2320          *
2321          * This parser is most similar to a recursive descent parser. Single
2322          * functions represent discrete grammatical rules for the language, and
2323          * they are able to capture the text that represents those rules.
2324          *
2325          * Consider the function lessc::keyword(). (all parse functions are
2326          * structured the same)
2327          *
2328          * The function takes a single reference argument. When calling the
2329          * function it will attempt to match a keyword on the head of the buffer.
2330          * If it is successful, it will place the keyword in the referenced
2331          * argument, advance the position in the buffer, and return true. If it
2332          * fails then it won't advance the buffer and it will return false.
2333          *
2334          * All of these parse functions are powered by lessc::match(), which behaves
2335          * the same way, but takes a literal regular expression. Sometimes it is
2336          * more convenient to use match instead of creating a new function.
2337          *
2338          * Because of the format of the functions, to parse an entire string of
2339          * grammatical rules, you can chain them together using &&.
2340          *
2341          * But, if some of the rules in the chain succeed before one fails, then
2342          * the buffer position will be left at an invalid state. In order to
2343          * avoid this, lessc::seek() is used to remember and set buffer positions.
2344          *
2345          * Before parsing a chain, use $s = $this->seek() to remember the current
2346          * position into $s. Then if a chain fails, use $this->seek($s) to
2347          * go back where we started.
2348          */
2349         protected function parseChunk() {
2350                 if (empty($this->buffer)) return false;
2351                 $s = $this->seek();
2352
2353                 // setting a property
2354                 if ($this->keyword($key) && $this->assign() &&
2355                         $this->propertyValue($value, $key) && $this->end())
2356                 {
2357                         $this->append(array('assign', $key, $value), $s);
2358                         return true;
2359                 } else {
2360                         $this->seek($s);
2361                 }
2362
2363
2364                 // look for special css blocks
2365                 if ($this->literal('@', false)) {
2366                         $this->count--;
2367
2368                         // media
2369                         if ($this->literal('@media')) {
2370                                 if (($this->mediaQueryList($mediaQueries) || true)
2371                                         && $this->literal('{'))
2372                                 {
2373                                         $media = $this->pushSpecialBlock("media");
2374                                         $media->queries = is_null($mediaQueries) ? array() : $mediaQueries;
2375                                         return true;
2376                                 } else {
2377                                         $this->seek($s);
2378                                         return false;
2379                                 }
2380                         }
2381
2382                         if ($this->literal("@", false) && $this->keyword($dirName)) {
2383                                 if ($this->isDirective($dirName, $this->blockDirectives)) {
2384                                         if (($this->openString("{", $dirValue, null, array(";")) || true) &&
2385                                                 $this->literal("{"))
2386                                         {
2387                                                 $dir = $this->pushSpecialBlock("directive");
2388                                                 $dir->name = $dirName;
2389                                                 if (isset($dirValue)) $dir->value = $dirValue;
2390                                                 return true;
2391                                         }
2392                                 } elseif ($this->isDirective($dirName, $this->lineDirectives)) {
2393                                         if ($this->propertyValue($dirValue) && $this->end()) {
2394                                                 $this->append(array("directive", $dirName, $dirValue));
2395                                                 return true;
2396                                         }
2397                                 }
2398                         }
2399
2400                         $this->seek($s);
2401                 }
2402
2403                 // setting a variable
2404                 if ($this->variable($var) && $this->assign() &&
2405                         $this->propertyValue($value) && $this->end())
2406                 {
2407                         $this->append(array('assign', $var, $value), $s);
2408                         return true;
2409                 } else {
2410                         $this->seek($s);
2411                 }
2412
2413                 if ($this->import($importValue)) {
2414                         $this->append($importValue, $s);
2415                         return true;
2416                 }
2417
2418                 // opening parametric mixin
2419                 if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) &&
2420                         ($this->guards($guards) || true) &&
2421                         $this->literal('{'))
2422                 {
2423                         $block = $this->pushBlock($this->fixTags(array($tag)));
2424                         $block->args = $args;
2425                         $block->isVararg = $isVararg;
2426                         if (!empty($guards)) $block->guards = $guards;
2427                         return true;
2428                 } else {
2429                         $this->seek($s);
2430                 }
2431
2432                 // opening a simple block
2433                 if ($this->tags($tags) && $this->literal('{')) {
2434                         $tags = $this->fixTags($tags);
2435                         $this->pushBlock($tags);
2436                         return true;
2437                 } else {
2438                         $this->seek($s);
2439                 }
2440
2441                 // closing a block
2442                 if ($this->literal('}', false)) {
2443                         try {
2444                                 $block = $this->pop();
2445                         } catch (exception $e) {
2446                                 $this->seek($s);
2447                                 $this->throwError($e->getMessage());
2448                         }
2449
2450                         $hidden = false;
2451                         if (is_null($block->type)) {
2452                                 $hidden = true;
2453                                 if (!isset($block->args)) {
2454                                         foreach ($block->tags as $tag) {
2455                                                 if (!is_string($tag) || $tag{0} != $this->lessc->mPrefix) {
2456                                                         $hidden = false;
2457                                                         break;
2458                                                 }
2459                                         }
2460                                 }
2461
2462                                 foreach ($block->tags as $tag) {
2463                                         if (is_string($tag)) {
2464                                                 $this->env->children[$tag][] = $block;
2465                                         }
2466                                 }
2467                         }
2468
2469                         if (!$hidden) {
2470                                 $this->append(array('block', $block), $s);
2471                         }
2472
2473                         // this is done here so comments aren't bundled into he block that
2474                         // was just closed
2475                         $this->whitespace();
2476                         return true;
2477                 }
2478
2479                 // mixin
2480                 if ($this->mixinTags($tags) &&
2481                         ($this->argumentDef($argv, $isVararg) || true) &&
2482                         ($this->keyword($suffix) || true) && $this->end())
2483                 {
2484                         $tags = $this->fixTags($tags);
2485                         $this->append(array('mixin', $tags, $argv, $suffix), $s);
2486                         return true;
2487                 } else {
2488                         $this->seek($s);
2489                 }
2490
2491                 // spare ;
2492                 if ($this->literal(';')) return true;
2493
2494                 return false; // got nothing, throw error
2495         }
2496
2497         protected function isDirective($dirname, $directives) {
2498                 // TODO: cache pattern in parser
2499                 $pattern = implode("|",
2500                         array_map(array("lessc", "preg_quote"), $directives));
2501                 $pattern = '/^(-[a-z-]+-)?(' . $pattern . ')$/i';
2502
2503                 return preg_match($pattern, $dirname);
2504         }
2505
2506         protected function fixTags($tags) {
2507                 // move @ tags out of variable namespace
2508                 foreach ($tags as &$tag) {
2509                         if ($tag{0} == $this->lessc->vPrefix)
2510                                 $tag[0] = $this->lessc->mPrefix;
2511                 }
2512                 return $tags;
2513         }
2514
2515         // a list of expressions
2516         protected function expressionList(&$exps) {
2517                 $values = array();
2518
2519                 while ($this->expression($exp)) {
2520                         $values[] = $exp;
2521                 }
2522
2523                 if (count($values) == 0) return false;
2524
2525                 $exps = lessc::compressList($values, ' ');
2526                 return true;
2527         }
2528
2529         /**
2530          * Attempt to consume an expression.
2531          * @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
2532          */
2533         protected function expression(&$out) {
2534                 if ($this->value($lhs)) {
2535                         $out = $this->expHelper($lhs, 0);
2536
2537                         // look for / shorthand
2538                         if (!empty($this->env->supressedDivision)) {
2539                                 unset($this->env->supressedDivision);
2540                                 $s = $this->seek();
2541                                 if ($this->literal("/") && $this->value($rhs)) {
2542                                         $out = array("list", "",
2543                                                 array($out, array("keyword", "/"), $rhs));
2544                                 } else {
2545                                         $this->seek($s);
2546                                 }
2547                         }
2548
2549                         return true;
2550                 }
2551                 return false;
2552         }
2553
2554         /**
2555          * recursively parse infix equation with $lhs at precedence $minP
2556          */
2557         protected function expHelper($lhs, $minP) {
2558                 $this->inExp = true;
2559                 $ss = $this->seek();
2560
2561                 while (true) {
2562                         $whiteBefore = isset($this->buffer[$this->count - 1]) &&
2563                                 ctype_space($this->buffer[$this->count - 1]);
2564
2565                         // If there is whitespace before the operator, then we require
2566                         // whitespace after the operator for it to be an expression
2567                         $needWhite = $whiteBefore && !$this->inParens;
2568
2569                         if ($this->match(self::$operatorString.($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP) {
2570                                 if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/" && empty($this->env->supressedDivision)) {
2571                                         foreach (self::$supressDivisionProps as $pattern) {
2572                                                 if (preg_match($pattern, $this->env->currentProperty)) {
2573                                                         $this->env->supressedDivision = true;
2574                                                         break 2;
2575                                                 }
2576                                         }
2577                                 }
2578
2579
2580                                 $whiteAfter = isset($this->buffer[$this->count - 1]) &&
2581                                         ctype_space($this->buffer[$this->count - 1]);
2582
2583                                 if (!$this->value($rhs)) break;
2584
2585                                 // peek for next operator to see what to do with rhs
2586                                 if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {
2587                                         $rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
2588                                 }
2589
2590                                 $lhs = array('expression', $m[1], $lhs, $rhs, $whiteBefore, $whiteAfter);
2591                                 $ss = $this->seek();
2592
2593                                 continue;
2594                         }
2595
2596                         break;
2597                 }
2598
2599                 $this->seek($ss);
2600
2601                 return $lhs;
2602         }
2603
2604         // consume a list of values for a property
2605         public function propertyValue(&$value, $keyName = null) {
2606                 $values = array();
2607
2608                 if ($keyName !== null) $this->env->currentProperty = $keyName;
2609
2610                 $s = null;
2611                 while ($this->expressionList($v)) {
2612                         $values[] = $v;
2613                         $s = $this->seek();
2614                         if (!$this->literal(',')) break;
2615                 }
2616
2617                 if ($s) $this->seek($s);
2618
2619                 if ($keyName !== null) unset($this->env->currentProperty);
2620
2621                 if (count($values) == 0) return false;
2622
2623                 $value = lessc::compressList($values, ', ');
2624                 return true;
2625         }
2626
2627         protected function parenValue(&$out) {
2628                 $s = $this->seek();
2629
2630                 // speed shortcut
2631                 if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(") {
2632                         return false;
2633                 }
2634
2635                 $inParens = $this->inParens;
2636                 if ($this->literal("(") &&
2637                         ($this->inParens = true) && $this->expression($exp) &&
2638                         $this->literal(")"))
2639                 {
2640                         $out = $exp;
2641                         $this->inParens = $inParens;
2642                         return true;
2643                 } else {
2644                         $this->inParens = $inParens;
2645                         $this->seek($s);
2646                 }
2647
2648                 return false;
2649         }
2650
2651         // a single value
2652         protected function value(&$value) {
2653                 $s = $this->seek();
2654
2655                 // speed shortcut
2656                 if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "-") {
2657                         // negation
2658                         if ($this->literal("-", false) &&
2659                                 (($this->variable($inner) && $inner = array("variable", $inner)) ||
2660                                 $this->unit($inner) ||
2661                                 $this->parenValue($inner)))
2662                         {
2663                                 $value = array("unary", "-", $inner);
2664                                 return true;
2665                         } else {
2666                                 $this->seek($s);
2667                         }
2668                 }
2669
2670                 if ($this->parenValue($value)) return true;
2671                 if ($this->unit($value)) return true;
2672                 if ($this->color($value)) return true;
2673                 if ($this->func($value)) return true;
2674                 if ($this->string($value)) return true;
2675
2676                 if ($this->keyword($word)) {
2677                         $value = array('keyword', $word);
2678                         return true;
2679                 }
2680
2681                 // try a variable
2682                 if ($this->variable($var)) {
2683                         $value = array('variable', $var);
2684                         return true;
2685                 }
2686
2687                 // unquote string (should this work on any type?
2688                 if ($this->literal("~") && $this->string($str)) {
2689                         $value = array("escape", $str);
2690                         return true;
2691                 } else {
2692                         $this->seek($s);
2693                 }
2694
2695                 // css hack: \0
2696                 if ($this->literal('\\') && $this->match('([0-9]+)', $m)) {
2697                         $value = array('keyword', '\\'.$m[1]);
2698                         return true;
2699                 } else {
2700                         $this->seek($s);
2701                 }
2702
2703                 return false;
2704         }
2705
2706         // an import statement
2707         protected function import(&$out) {
2708                 $s = $this->seek();
2709                 if (!$this->literal('@import')) return false;
2710
2711                 // @import "something.css" media;
2712                 // @import url("something.css") media;
2713                 // @import url(something.css) media;
2714
2715                 if ($this->propertyValue($value)) {
2716                         $out = array("import", $value);
2717                         return true;
2718                 }
2719         }
2720
2721         protected function mediaQueryList(&$out) {
2722                 if ($this->genericList($list, "mediaQuery", ",", false)) {
2723                         $out = $list[2];
2724                         return true;
2725                 }
2726                 return false;
2727         }
2728
2729         protected function mediaQuery(&$out) {
2730                 $s = $this->seek();
2731
2732                 $expressions = null;
2733                 $parts = array();
2734
2735                 if (($this->literal("only") && ($only = true) || $this->literal("not") && ($not = true) || true) && $this->keyword($mediaType)) {
2736                         $prop = array("mediaType");
2737                         if (isset($only)) $prop[] = "only";
2738                         if (isset($not)) $prop[] = "not";
2739                         $prop[] = $mediaType;
2740                         $parts[] = $prop;
2741                 } else {
2742                         $this->seek($s);
2743                 }
2744
2745
2746                 if (!empty($mediaType) && !$this->literal("and")) {
2747                         // ~
2748                 } else {
2749                         $this->genericList($expressions, "mediaExpression", "and", false);
2750                         if (is_array($expressions)) $parts = array_merge($parts, $expressions[2]);
2751                 }
2752
2753                 if (count($parts) == 0) {
2754                         $this->seek($s);
2755                         return false;
2756                 }
2757
2758                 $out = $parts;
2759                 return true;
2760         }
2761
2762         protected function mediaExpression(&$out) {
2763                 $s = $this->seek();
2764                 $value = null;
2765                 if ($this->literal("(") &&
2766                         $this->keyword($feature) &&
2767                         ($this->literal(":") && $this->expression($value) || true) &&
2768                         $this->literal(")"))
2769                 {
2770                         $out = array("mediaExp", $feature);
2771                         if ($value) $out[] = $value;
2772                         return true;
2773                 } elseif ($this->variable($variable)) {
2774                         $out = array('variable', $variable);
2775                         return true;
2776                 }
2777
2778                 $this->seek($s);
2779                 return false;
2780         }
2781
2782         // an unbounded string stopped by $end
2783         protected function openString($end, &$out, $nestingOpen=null, $rejectStrs = null) {
2784                 $oldWhite = $this->eatWhiteDefault;
2785                 $this->eatWhiteDefault = false;
2786
2787                 $stop = array("'", '"', "@{", $end);
2788                 $stop = array_map(array("lessc", "preg_quote"), $stop);
2789                 // $stop[] = self::$commentMulti;
2790
2791                 if (!is_null($rejectStrs)) {
2792                         $stop = array_merge($stop, $rejectStrs);
2793                 }
2794
2795                 $patt = '(.*?)('.implode("|", $stop).')';
2796
2797                 $nestingLevel = 0;
2798
2799                 $content = array();
2800                 while ($this->match($patt, $m, false)) {
2801                         if (!empty($m[1])) {
2802                                 $content[] = $m[1];
2803                                 if ($nestingOpen) {
2804                                         $nestingLevel += substr_count($m[1], $nestingOpen);
2805                                 }
2806                         }
2807
2808                         $tok = $m[2];
2809
2810                         $this->count-= strlen($tok);
2811                         if ($tok == $end) {
2812                                 if ($nestingLevel == 0) {
2813                                         break;
2814                                 } else {
2815                                         $nestingLevel--;
2816                                 }
2817                         }
2818
2819                         if (($tok == "'" || $tok == '"') && $this->string($str)) {
2820                                 $content[] = $str;
2821                                 continue;
2822                         }
2823
2824                         if ($tok == "@{" && $this->interpolation($inter)) {
2825                                 $content[] = $inter;
2826                                 continue;
2827                         }
2828
2829                         if (!empty($rejectStrs) && in_array($tok, $rejectStrs)) {
2830                                 break;
2831                         }
2832
2833                         $content[] = $tok;
2834                         $this->count+= strlen($tok);
2835                 }
2836
2837                 $this->eatWhiteDefault = $oldWhite;
2838
2839                 if (count($content) == 0) return false;
2840
2841                 // trim the end
2842                 if (is_string(end($content))) {
2843                         $content[count($content) - 1] = rtrim(end($content));
2844                 }
2845
2846                 $out = array("string", "", $content);
2847                 return true;
2848         }
2849
2850         protected function string(&$out) {
2851                 $s = $this->seek();
2852                 if ($this->literal('"', false)) {
2853                         $delim = '"';
2854                 } elseif ($this->literal("'", false)) {
2855                         $delim = "'";
2856                 } else {
2857                         return false;
2858                 }
2859
2860                 $content = array();
2861
2862                 // look for either ending delim , escape, or string interpolation
2863                 $patt = '([^\n]*?)(@\{|\\\\|' .
2864                         lessc::preg_quote($delim).')';
2865
2866                 $oldWhite = $this->eatWhiteDefault;
2867                 $this->eatWhiteDefault = false;
2868
2869                 while ($this->match($patt, $m, false)) {
2870                         $content[] = $m[1];
2871                         if ($m[2] == "@{") {
2872                                 $this->count -= strlen($m[2]);
2873                                 if ($this->interpolation($inter, false)) {
2874                                         $content[] = $inter;
2875                                 } else {
2876                                         $this->count += strlen($m[2]);
2877                                         $content[] = "@{"; // ignore it
2878                                 }
2879                         } elseif ($m[2] == '\\') {
2880                                 $content[] = $m[2];
2881                                 if ($this->literal($delim, false)) {
2882                                         $content[] = $delim;
2883                                 }
2884                         } else {
2885                                 $this->count -= strlen($delim);
2886                                 break; // delim
2887                         }
2888                 }
2889
2890                 $this->eatWhiteDefault = $oldWhite;
2891
2892                 if ($this->literal($delim)) {
2893                         $out = array("string", $delim, $content);
2894                         return true;
2895                 }
2896
2897                 $this->seek($s);
2898                 return false;
2899         }
2900
2901         protected function interpolation(&$out) {
2902                 $oldWhite = $this->eatWhiteDefault;
2903                 $this->eatWhiteDefault = true;
2904
2905                 $s = $this->seek();
2906                 if ($this->literal("@{") &&
2907                         $this->openString("}", $interp, null, array("'", '"', ";")) &&
2908                         $this->literal("}", false))
2909                 {
2910                         $out = array("interpolate", $interp);
2911                         $this->eatWhiteDefault = $oldWhite;
2912                         if ($this->eatWhiteDefault) $this->whitespace();
2913                         return true;
2914                 }
2915
2916                 $this->eatWhiteDefault = $oldWhite;
2917                 $this->seek($s);
2918                 return false;
2919         }
2920
2921         protected function unit(&$unit) {
2922                 // speed shortcut
2923                 if (isset($this->buffer[$this->count])) {
2924                         $char = $this->buffer[$this->count];
2925                         if (!ctype_digit($char) && $char != ".") return false;
2926                 }
2927
2928                 if ($this->match('([0-9]+(?:\.[0-9]*)?|\.[0-9]+)([%a-zA-Z]+)?', $m)) {
2929                         $unit = array("number", $m[1], empty($m[2]) ? "" : $m[2]);
2930                         return true;
2931                 }
2932                 return false;
2933         }
2934
2935         // a # color
2936         protected function color(&$out) {
2937                 if ($this->match('(#(?:[0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{3}))', $m)) {
2938                         if (strlen($m[1]) > 7) {
2939                                 $out = array("string", "", array($m[1]));
2940                         } else {
2941                                 $out = array("raw_color", $m[1]);
2942                         }
2943                         return true;
2944                 }
2945
2946                 return false;
2947         }
2948
2949         // consume an argument definition list surrounded by ()
2950         // each argument is a variable name with optional value
2951         // or at the end a ... or a variable named followed by ...
2952         // arguments are separated by , unless a ; is in the list, then ; is the
2953         // delimiter.
2954         protected function argumentDef(&$args, &$isVararg) {
2955                 $s = $this->seek();
2956                 if (!$this->literal('(')) return false;
2957
2958                 $values = array();
2959                 $delim = ",";
2960                 $method = "expressionList";
2961
2962                 $isVararg = false;
2963                 while (true) {
2964                         if ($this->literal("...")) {
2965                                 $isVararg = true;
2966                                 break;
2967                         }
2968
2969                         if ($this->$method($value)) {
2970                                 if ($value[0] == "variable") {
2971                                         $arg = array("arg", $value[1]);
2972                                         $ss = $this->seek();
2973
2974                                         if ($this->assign() && $this->$method($rhs)) {
2975                                                 $arg[] = $rhs;
2976                                         } else {
2977                                                 $this->seek($ss);
2978                                                 if ($this->literal("...")) {
2979                                                         $arg[0] = "rest";
2980                                                         $isVararg = true;
2981                                                 }
2982                                         }
2983
2984                                         $values[] = $arg;
2985                                         if ($isVararg) break;
2986                                         continue;
2987                                 } else {
2988                                         $values[] = array("lit", $value);
2989                                 }
2990                         }
2991
2992
2993                         if (!$this->literal($delim)) {
2994                                 if ($delim == "," && $this->literal(";")) {
2995                                         // found new delim, convert existing args
2996                                         $delim = ";";
2997                                         $method = "propertyValue";
2998
2999                                         // transform arg list
3000                                         if (isset($values[1])) { // 2 items
3001                                                 $newList = array();
3002                                                 foreach ($values as $i => $arg) {
3003                                                         switch($arg[0]) {
3004                                                         case "arg":
3005                                                                 if ($i) {
3006                                                                         $this->throwError("Cannot mix ; and , as delimiter types");
3007                                                                 }
3008                                                                 $newList[] = $arg[2];
3009                                                                 break;
3010                                                         case "lit":
3011                                                                 $newList[] = $arg[1];
3012                                                                 break;
3013                                                         case "rest":
3014                                                                 $this->throwError("Unexpected rest before semicolon");
3015                                                         }
3016                                                 }
3017
3018                                                 $newList = array("list", ", ", $newList);
3019
3020                                                 switch ($values[0][0]) {
3021                                                 case "arg":
3022                                                         $newArg = array("arg", $values[0][1], $newList);
3023                                                         break;
3024                                                 case "lit":
3025                                                         $newArg = array("lit", $newList);
3026                                                         break;
3027                                                 }
3028
3029                                         } elseif ($values) { // 1 item
3030                                                 $newArg = $values[0];
3031                                         }
3032
3033                                         if ($newArg) {
3034                                                 $values = array($newArg);
3035                                         }
3036                                 } else {
3037                                         break;
3038                                 }
3039                         }
3040                 }
3041
3042                 if (!$this->literal(')')) {
3043                         $this->seek($s);
3044                         return false;
3045                 }
3046
3047                 $args = $values;
3048
3049                 return true;
3050         }
3051
3052         // consume a list of tags
3053         // this accepts a hanging delimiter
3054         protected function tags(&$tags, $simple = false, $delim = ',') {
3055                 $tags = array();
3056                 while ($this->tag($tt, $simple)) {
3057                         $tags[] = $tt;
3058                         if (!$this->literal($delim)) break;
3059                 }
3060                 if (count($tags) == 0) return false;
3061
3062                 return true;
3063         }
3064
3065         // list of tags of specifying mixin path
3066         // optionally separated by > (lazy, accepts extra >)
3067         protected function mixinTags(&$tags) {
3068                 $s = $this->seek();
3069                 $tags = array();
3070                 while ($this->tag($tt, true)) {
3071                         $tags[] = $tt;
3072                         $this->literal(">");
3073                 }
3074
3075                 if (count($tags) == 0) return false;
3076
3077                 return true;
3078         }
3079
3080         // a bracketed value (contained within in a tag definition)
3081         protected function tagBracket(&$parts, &$hasExpression) {
3082                 // speed shortcut
3083                 if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "[") {
3084                         return false;
3085                 }
3086
3087                 $s = $this->seek();
3088
3089                 $hasInterpolation = false;
3090
3091                 if ($this->literal("[", false)) {
3092                         $attrParts = array("[");
3093                         // keyword, string, operator
3094                         while (true) {
3095                                 if ($this->literal("]", false)) {
3096                                         $this->count--;
3097                                         break; // get out early
3098                                 }
3099
3100                                 if ($this->match('\s+', $m)) {
3101                                         $attrParts[] = " ";
3102                                         continue;
3103                                 }
3104                                 if ($this->string($str)) {
3105                                         // escape parent selector, (yuck)
3106                                         foreach ($str[2] as &$chunk) {
3107                                                 $chunk = str_replace($this->lessc->parentSelector, "$&$", $chunk);
3108                                         }
3109
3110                                         $attrParts[] = $str;
3111                                         $hasInterpolation = true;
3112                                         continue;
3113                                 }
3114
3115                                 if ($this->keyword($word)) {
3116                                         $attrParts[] = $word;
3117                                         continue;
3118                                 }
3119
3120                                 if ($this->interpolation($inter, false)) {
3121                                         $attrParts[] = $inter;
3122                                         $hasInterpolation = true;
3123                                         continue;
3124                                 }
3125
3126                                 // operator, handles attr namespace too
3127                                 if ($this->match('[|-~\$\*\^=]+', $m)) {
3128                                         $attrParts[] = $m[0];
3129                                         continue;
3130                                 }
3131
3132                                 break;
3133                         }
3134
3135                         if ($this->literal("]", false)) {
3136                                 $attrParts[] = "]";
3137                                 foreach ($attrParts as $part) {
3138                                         $parts[] = $part;
3139                                 }
3140                                 $hasExpression = $hasExpression || $hasInterpolation;
3141                                 return true;
3142                         }
3143                         $this->seek($s);
3144                 }
3145
3146                 $this->seek($s);
3147                 return false;
3148         }
3149
3150         // a space separated list of selectors
3151         protected function tag(&$tag, $simple = false) {
3152                 if ($simple)
3153                         $chars = '^@,:;{}\][>\(\) "\'';
3154                 else
3155                         $chars = '^@,;{}["\'';
3156
3157                 $s = $this->seek();
3158
3159                 $hasExpression = false;
3160                 $parts = array();
3161                 while ($this->tagBracket($parts, $hasExpression));
3162
3163                 $oldWhite = $this->eatWhiteDefault;
3164                 $this->eatWhiteDefault = false;
3165
3166                 while (true) {
3167                         if ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
3168                                 $parts[] = $m[1];
3169                                 if ($simple) break;
3170
3171                                 while ($this->tagBracket($parts, $hasExpression));
3172                                 continue;
3173                         }
3174
3175                         if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "@") {
3176                                 if ($this->interpolation($interp)) {
3177                                         $hasExpression = true;
3178                                         $interp[2] = true; // don't unescape
3179                                         $parts[] = $interp;
3180                                         continue;
3181                                 }
3182
3183                                 if ($this->literal("@")) {
3184                                         $parts[] = "@";
3185                                         continue;
3186                                 }
3187                         }
3188
3189                         if ($this->unit($unit)) { // for keyframes
3190                                 $parts[] = $unit[1];
3191                                 $parts[] = $unit[2];
3192                                 continue;
3193                         }
3194
3195                         break;
3196                 }
3197
3198                 $this->eatWhiteDefault = $oldWhite;
3199                 if (!$parts) {
3200                         $this->seek($s);
3201                         return false;
3202                 }
3203
3204                 if ($hasExpression) {
3205                         $tag = array("exp", array("string", "", $parts));
3206                 } else {
3207                         $tag = trim(implode($parts));
3208                 }
3209
3210                 $this->whitespace();
3211                 return true;
3212         }
3213
3214         // a css function
3215         protected function func(&$func) {
3216                 $s = $this->seek();
3217
3218                 if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
3219                         $fname = $m[1];
3220
3221                         $sPreArgs = $this->seek();
3222
3223                         $args = array();
3224                         while (true) {
3225                                 $ss = $this->seek();
3226                                 // this ugly nonsense is for ie filter properties
3227                                 if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
3228                                         $args[] = array("string", "", array($name, "=", $value));
3229                                 } else {
3230                                         $this->seek($ss);
3231                                         if ($this->expressionList($value)) {
3232                                                 $args[] = $value;
3233                                         }
3234                                 }
3235
3236                                 if (!$this->literal(',')) break;
3237                         }
3238                         $args = array('list', ',', $args);
3239
3240                         if ($this->literal(')')) {
3241                                 $func = array('function', $fname, $args);
3242                                 return true;
3243                         } elseif ($fname == 'url') {
3244                                 // couldn't parse and in url? treat as string
3245                                 $this->seek($sPreArgs);
3246                                 if ($this->openString(")", $string) && $this->literal(")")) {
3247                                         $func = array('function', $fname, $string);
3248                                         return true;
3249                                 }
3250                         }
3251                 }
3252
3253                 $this->seek($s);
3254                 return false;
3255         }
3256
3257         // consume a less variable
3258         protected function variable(&$name) {
3259                 $s = $this->seek();
3260                 if ($this->literal($this->lessc->vPrefix, false) &&
3261                         ($this->variable($sub) || $this->keyword($name)))
3262                 {
3263                         if (!empty($sub)) {
3264                                 $name = array('variable', $sub);
3265                         } else {
3266                                 $name = $this->lessc->vPrefix.$name;
3267                         }
3268                         return true;
3269                 }
3270
3271                 $name = null;
3272                 $this->seek($s);
3273                 return false;
3274         }
3275
3276         /**
3277          * Consume an assignment operator
3278          * Can optionally take a name that will be set to the current property name
3279          */
3280         protected function assign($name = null) {
3281                 if ($name) $this->currentProperty = $name;
3282                 return $this->literal(':') || $this->literal('=');
3283         }
3284
3285         // consume a keyword
3286         protected function keyword(&$word) {
3287                 if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m)) {
3288                         $word = $m[1];
3289                         return true;
3290                 }
3291                 return false;
3292         }
3293
3294         // consume an end of statement delimiter
3295         protected function end() {
3296                 if ($this->literal(';')) {
3297                         return true;
3298                 } elseif ($this->count == strlen($this->buffer) || $this->buffer[$this->count] == '}') {
3299                         // if there is end of file or a closing block next then we don't need a ;
3300                         return true;
3301                 }
3302                 return false;
3303         }
3304
3305         protected function guards(&$guards) {
3306                 $s = $this->seek();
3307
3308                 if (!$this->literal("when")) {
3309                         $this->seek($s);
3310                         return false;
3311                 }
3312
3313                 $guards = array();
3314
3315                 while ($this->guardGroup($g)) {
3316                         $guards[] = $g;
3317                         if (!$this->literal(",")) break;
3318                 }
3319
3320                 if (count($guards) == 0) {
3321                         $guards = null;
3322                         $this->seek($s);
3323                         return false;
3324                 }
3325
3326                 return true;
3327         }
3328
3329         // a bunch of guards that are and'd together
3330         // TODO rename to guardGroup
3331         protected function guardGroup(&$guardGroup) {
3332                 $s = $this->seek();
3333                 $guardGroup = array();
3334                 while ($this->guard($guard)) {
3335                         $guardGroup[] = $guard;
3336                         if (!$this->literal("and")) break;
3337                 }
3338
3339                 if (count($guardGroup) == 0) {
3340                         $guardGroup = null;
3341                         $this->seek($s);
3342                         return false;
3343                 }
3344
3345                 return true;
3346         }
3347
3348         protected function guard(&$guard) {
3349                 $s = $this->seek();
3350                 $negate = $this->literal("not");
3351
3352                 if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
3353                         $guard = $exp;
3354                         if ($negate) $guard = array("negate", $guard);
3355                         return true;
3356                 }
3357
3358                 $this->seek($s);
3359                 return false;
3360         }
3361
3362         /* raw parsing functions */
3363
3364         protected function literal($what, $eatWhitespace = null) {
3365                 if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
3366
3367                 // shortcut on single letter
3368                 if (!isset($what[1]) && isset($this->buffer[$this->count])) {
3369                         if ($this->buffer[$this->count] == $what) {
3370                                 if (!$eatWhitespace) {
3371                                         $this->count++;
3372                                         return true;
3373                                 }
3374                                 // goes below...
3375                         } else {
3376                                 return false;
3377                         }
3378                 }
3379
3380                 if (!isset(self::$literalCache[$what])) {
3381                         self::$literalCache[$what] = lessc::preg_quote($what);
3382                 }
3383
3384                 return $this->match(self::$literalCache[$what], $m, $eatWhitespace);
3385         }
3386
3387         protected function genericList(&$out, $parseItem, $delim="", $flatten=true) {
3388                 $s = $this->seek();
3389                 $items = array();
3390                 while ($this->$parseItem($value)) {
3391                         $items[] = $value;
3392                         if ($delim) {
3393                                 if (!$this->literal($delim)) break;
3394                         }
3395                 }
3396
3397                 if (count($items) == 0) {
3398                         $this->seek($s);
3399                         return false;
3400                 }
3401
3402                 if ($flatten && count($items) == 1) {
3403                         $out = $items[0];
3404                 } else {
3405                         $out = array("list", $delim, $items);
3406                 }
3407
3408                 return true;
3409         }
3410
3411
3412         // advance counter to next occurrence of $what
3413         // $until - don't include $what in advance
3414         // $allowNewline, if string, will be used as valid char set
3415         protected function to($what, &$out, $until = false, $allowNewline = false) {
3416                 if (is_string($allowNewline)) {
3417                         $validChars = $allowNewline;
3418                 } else {
3419                         $validChars = $allowNewline ? "." : "[^\n]";
3420                 }
3421                 if (!$this->match('('.$validChars.'*?)'.lessc::preg_quote($what), $m, !$until)) return false;
3422                 if ($until) $this->count -= strlen($what); // give back $what
3423                 $out = $m[1];
3424                 return true;
3425         }
3426
3427         // try to match something on head of buffer
3428         protected function match($regex, &$out, $eatWhitespace = null) {
3429                 if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
3430
3431                 $r = '/'.$regex.($eatWhitespace && !$this->writeComments ? '\s*' : '').'/Ais';
3432                 if (preg_match($r, $this->buffer, $out, null, $this->count)) {
3433                         $this->count += strlen($out[0]);
3434                         if ($eatWhitespace && $this->writeComments) $this->whitespace();
3435                         return true;
3436                 }
3437                 return false;
3438         }
3439
3440         // match some whitespace
3441         protected function whitespace() {
3442                 if ($this->writeComments) {
3443                         $gotWhite = false;
3444                         while (preg_match(self::$whitePattern, $this->buffer, $m, null, $this->count)) {
3445                                 if (isset($m[1]) && empty($this->commentsSeen[$this->count])) {
3446                                         $this->append(array("comment", $m[1]));
3447                                         $this->commentsSeen[$this->count] = true;
3448                                 }
3449                                 $this->count += strlen($m[0]);
3450                                 $gotWhite = true;
3451                         }
3452                         return $gotWhite;
3453                 } else {
3454                         $this->match("", $m);
3455                         return strlen($m[0]) > 0;
3456                 }
3457         }
3458
3459         // match something without consuming it
3460         protected function peek($regex, &$out = null, $from=null) {
3461                 if (is_null($from)) $from = $this->count;
3462                 $r = '/'.$regex.'/Ais';
3463                 $result = preg_match($r, $this->buffer, $out, null, $from);
3464
3465                 return $result;
3466         }
3467
3468         // seek to a spot in the buffer or return where we are on no argument
3469         protected function seek($where = null) {
3470                 if ($where === null) return $this->count;
3471                 else $this->count = $where;
3472                 return true;
3473         }
3474
3475         /* misc functions */
3476
3477         public function throwError($msg = "parse error", $count = null) {
3478                 $count = is_null($count) ? $this->count : $count;
3479
3480                 $line = $this->line +
3481                         substr_count(substr($this->buffer, 0, $count), "\n");
3482
3483                 if (!empty($this->sourceName)) {
3484                         $loc = "$this->sourceName on line $line";
3485                 } else {
3486                         $loc = "line: $line";
3487                 }
3488
3489                 // TODO this depends on $this->count
3490                 if ($this->peek("(.*?)(\n|$)", $m, $count)) {
3491                         throw new exception("$msg: failed at `$m[1]` $loc");
3492                 } else {
3493                         throw new exception("$msg: $loc");
3494                 }
3495         }
3496
3497         protected function pushBlock($selectors=null, $type=null) {
3498                 $b = new stdclass;
3499                 $b->parent = $this->env;
3500
3501                 $b->type = $type;
3502                 $b->id = self::$nextBlockId++;
3503
3504                 $b->isVararg = false; // TODO: kill me from here
3505                 $b->tags = $selectors;
3506
3507                 $b->props = array();
3508                 $b->children = array();
3509
3510                 $this->env = $b;
3511                 return $b;
3512         }
3513
3514         // push a block that doesn't multiply tags
3515         protected function pushSpecialBlock($type) {
3516                 return $this->pushBlock(null, $type);
3517         }
3518
3519         // append a property to the current block
3520         protected function append($prop, $pos = null) {
3521                 if ($pos !== null) $prop[-1] = $pos;
3522                 $this->env->props[] = $prop;
3523         }
3524
3525         // pop something off the stack
3526         protected function pop() {
3527                 $old = $this->env;
3528                 $this->env = $this->env->parent;
3529                 return $old;
3530         }
3531
3532         // remove comments from $text
3533         // todo: make it work for all functions, not just url
3534         protected function removeComments($text) {
3535                 $look = array(
3536                         'url(', '//', '/*', '"', "'"
3537                 );
3538
3539                 $out = '';
3540                 $min = null;
3541                 while (true) {
3542                         // find the next item
3543                         foreach ($look as $token) {
3544                                 $pos = strpos($text, $token);
3545                                 if ($pos !== false) {
3546                                         if (!isset($min) || $pos < $min[1]) $min = array($token, $pos);
3547                                 }
3548                         }
3549
3550                         if (is_null($min)) break;
3551
3552                         $count = $min[1];
3553                         $skip = 0;
3554                         $newlines = 0;
3555                         switch ($min[0]) {
3556                         case 'url(':
3557                                 if (preg_match('/url\(.*?\)/', $text, $m, 0, $count))
3558                                         $count += strlen($m[0]) - strlen($min[0]);
3559                                 break;
3560                         case '"':
3561                         case "'":
3562                                 if (preg_match('/'.$min[0].'.*?(?<!\\\\)'.$min[0].'/', $text, $m, 0, $count))
3563                                         $count += strlen($m[0]) - 1;
3564                                 break;
3565                         case '//':
3566                                 $skip = strpos($text, "\n", $count);
3567                                 if ($skip === false) $skip = strlen($text) - $count;
3568                                 else $skip -= $count;
3569                                 break;
3570                         case '/*':
3571                                 if (preg_match('/\/\*.*?\*\//s', $text, $m, 0, $count)) {
3572                                         $skip = strlen($m[0]);
3573                                         $newlines = substr_count($m[0], "\n");
3574                                 }
3575                                 break;
3576                         }
3577
3578                         if ($skip == 0) $count += strlen($min[0]);
3579
3580                         $out .= substr($text, 0, $count).str_repeat("\n", $newlines);
3581                         $text = substr($text, $count + $skip);
3582
3583                         $min = null;
3584                 }
3585
3586                 return $out.$text;
3587         }
3588
3589 }
3590
3591 class lessc_formatter_classic {
3592         public $indentChar = "  ";
3593
3594         public $break = "\n";
3595         public $open = " {";
3596         public $close = "}";
3597         public $selectorSeparator = ", ";
3598         public $assignSeparator = ":";
3599
3600         public $openSingle = " { ";
3601         public $closeSingle = " }";
3602
3603         public $disableSingle = false;
3604         public $breakSelectors = false;
3605
3606         public $compressColors = false;
3607
3608         public function __construct() {
3609                 $this->indentLevel = 0;
3610         }
3611
3612         public function indentStr($n = 0) {
3613                 return str_repeat($this->indentChar, max($this->indentLevel + $n, 0));
3614         }
3615
3616         public function property($name, $value) {
3617                 return $name . $this->assignSeparator . $value . ";";
3618         }
3619
3620         protected function isEmpty($block) {
3621                 if (empty($block->lines)) {
3622                         foreach ($block->children as $child) {
3623                                 if (!$this->isEmpty($child)) return false;
3624                         }
3625
3626                         return true;
3627                 }
3628                 return false;
3629         }
3630
3631         public function block($block) {
3632                 if ($this->isEmpty($block)) return;
3633
3634                 $inner = $pre = $this->indentStr();
3635
3636                 $isSingle = !$this->disableSingle &&
3637                         is_null($block->type) && count($block->lines) == 1;
3638
3639                 if (!empty($block->selectors)) {
3640                         $this->indentLevel++;
3641
3642                         if ($this->breakSelectors) {
3643                                 $selectorSeparator = $this->selectorSeparator . $this->break . $pre;
3644                         } else {
3645                                 $selectorSeparator = $this->selectorSeparator;
3646                         }
3647
3648                         echo $pre .
3649                                 implode($selectorSeparator, $block->selectors);
3650                         if ($isSingle) {
3651                                 echo $this->openSingle;
3652                                 $inner = "";
3653                         } else {
3654                                 echo $this->open . $this->break;
3655                                 $inner = $this->indentStr();
3656                         }
3657
3658                 }
3659
3660                 if (!empty($block->lines)) {
3661                         $glue = $this->break.$inner;
3662                         echo $inner . implode($glue, $block->lines);
3663                         if (!$isSingle && !empty($block->children)) {
3664                                 echo $this->break;
3665                         }
3666                 }
3667
3668                 foreach ($block->children as $child) {
3669                         $this->block($child);
3670                 }
3671
3672                 if (!empty($block->selectors)) {
3673                         if (!$isSingle && empty($block->children)) echo $this->break;
3674
3675                         if ($isSingle) {
3676                                 echo $this->closeSingle . $this->break;
3677                         } else {
3678                                 echo $pre . $this->close . $this->break;
3679                         }
3680
3681                         $this->indentLevel--;
3682                 }
3683         }
3684 }
3685
3686 class lessc_formatter_compressed extends lessc_formatter_classic {
3687         public $disableSingle = true;
3688         public $open = "{";
3689         public $selectorSeparator = ",";
3690         public $assignSeparator = ":";
3691         public $break = "";
3692         public $compressColors = true;
3693
3694         public function indentStr($n = 0) {
3695                 return "";
3696         }
3697 }
3698
3699 class lessc_formatter_lessjs extends lessc_formatter_classic {
3700         public $disableSingle = true;
3701         public $breakSelectors = true;
3702         public $assignSeparator = ": ";
3703         public $selectorSeparator = ",";
3704 }
3705
3706