File indexing completed on 2024-12-22 05:36:22

 <?php
 
 /**
  * lessphp v0.4.0
  * http://leafo.net/lessphp
  *
  * LESS css compiler, adapted from http://lesscss.org
  *
  * Copyright 2012, Leaf Corcoran <leafot@gmail.com>
  * Licensed under MIT or GPLv3, see LICENSE
  */
 
 
 /**
  * The less compiler and parser.
  *
  * Converting LESS to CSS is a three stage process. The incoming file is parsed
  * by `lessc_parser` into a syntax tree, then it is compiled into another tree
  * representing the CSS structure by `lessc`. The CSS tree is fed into a
  * formatter, like `lessc_formatter` which then outputs CSS as a string.
  *
  * During the first compile, all values are *reduced*, which means that their
  * types are brought to the lowest form before being dump as strings. This
  * handles math equations, variable dereferences, and the like.
  *
  * The `parse` function of `lessc` is the entry point.
  *
  * In summary:
  *
  * The `lessc` class creates an intstance of the parser, feeds it LESS code,
  * then transforms the resulting tree to a CSS tree. This class also holds the
  * evaluation context, such as all available mixins and variables at any given
  * time.
  *
  * The `lessc_parser` class is only concerned with parsing its input.
  *
  * The `lessc_formatter` takes a CSS tree, and dumps it to a formatted string,
  * handling things like indentation.
  */
 class lessc {
   static public $VERSION = "v0.4.0";
   static protected $TRUE = array("keyword", "true");
   static protected $FALSE = array("keyword", "false");
 
   protected $libFunctions = array();
   protected $registeredVars = array();
   protected $preserveComments = false;
 
   public $vPrefix = '@'; // prefix of abstract properties
   public $mPrefix = '$'; // prefix of abstract blocks
   public $parentSelector = '&';
 
   public $importDisabled = false;
   public $importDir = '';
 
   protected $numberPrecision = null;
 
   protected $allParsedFiles = array();
 
   // set to the parser that generated the current line when compiling
   // so we know how to create error messages
   protected $sourceParser = null;
   protected $sourceLoc = null;
 
   static public $defaultValue = array("keyword", "");
 
   static protected $nextImportId = 0; // uniquely identify imports
 
   // attempts to find the path of an import url, returns null for css files
   protected function findImport($url) {
     foreach ((array)$this->importDir as $dir) {
       $full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
       if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
         return $file;
       }
     }
 
     return null;
   }
 
   protected function fileExists($name) {
     return is_file($name);
   }
 
   static public function compressList($items, $delim) {
     if (!isset($items[1]) && isset($items[0])) return $items[0];
     else return array('list', $delim, $items);
   }
 
   static public function preg_quote($what) {
     return preg_quote($what, '/');
   }
 
   protected function tryImport($importPath, $parentBlock, $out) {
     if ($importPath[0] == "function" && $importPath[1] == "url") {
       $importPath = $this->flattenList($importPath[2]);
     }
 
     $str = $this->coerceString($importPath);
     if ($str === null) return false;
 
     $url = $this->compileValue($this->lib_e($str));
 
     // don't import if it ends in css
     if (substr_compare($url, '.css', -4, 4) === 0) return false;
 
     $realPath = $this->findImport($url);
 
     if ($realPath === null) return false;
 
     if ($this->importDisabled) {
       return array(false, "/* import disabled */");
     }
 
     if (isset($this->allParsedFiles[realpath($realPath)])) {
       return array(false, null);
     }
 
     $this->addParsedFile($realPath);
     $parser = $this->makeParser($realPath);
     $root = $parser->parse(file_get_contents($realPath));
 
     // set the parents of all the block props
     foreach ($root->props as $prop) {
       if ($prop[0] == "block") {
         $prop[1]->parent = $parentBlock;
       }
     }
 
     // copy mixins into scope, set their parents
     // bring blocks from import into current block
     // TODO: need to mark the source parser these came from this file
     foreach ($root->children as $childName => $child) {
       if (isset($parentBlock->children[$childName])) {
         $parentBlock->children[$childName] = array_merge(
           $parentBlock->children[$childName],
           $child);
       } else {
         $parentBlock->children[$childName] = $child;
       }
     }
 
     $pi = pathinfo($realPath);
     $dir = $pi["dirname"];
 
     list($top, $bottom) = $this->sortProps($root->props, true);
     $this->compileImportedProps($top, $parentBlock, $out, $parser, $dir);
 
     return array(true, $bottom, $parser, $dir);
   }
 
   protected function compileImportedProps($props, $block, $out, $sourceParser, $importDir) {
     $oldSourceParser = $this->sourceParser;
 
     $oldImport = $this->importDir;
 
     // TODO: this is because the importDir api is stupid
     $this->importDir = (array)$this->importDir;
     array_unshift($this->importDir, $importDir);
 
     foreach ($props as $prop) {
       $this->compileProp($prop, $block, $out);
     }
 
     $this->importDir = $oldImport;
     $this->sourceParser = $oldSourceParser;
   }
 
   /**
    * Recursively compiles a block.
    *
    * A block is analogous to a CSS block in most cases. A single LESS document
    * is encapsulated in a block when parsed, but it does not have parent tags
    * so all of it's children appear on the root level when compiled.
    *
    * Blocks are made up of props and children.
    *
    * Props are property instructions, array tuples which describe an action
    * to be taken, eg. write a property, set a variable, mixin a block.
    *
    * The children of a block are just all the blocks that are defined within.
    * This is used to look up mixins when performing a mixin.
    *
    * Compiling the block involves pushing a fresh environment on the stack,
    * and iterating through the props, compiling each one.
    *
    * See lessc::compileProp()
    *
    */
   protected function compileBlock($block) {
     switch ($block->type) {
     case "root":
       $this->compileRoot($block);
       break;
     case null:
       $this->compileCSSBlock($block);
       break;
     case "media":
       $this->compileMedia($block);
       break;
     case "directive":
       $name = "@" . $block->name;
       if (!empty($block->value)) {
         $name .= " " . $this->compileValue($this->reduce($block->value));
       }
 
       $this->compileNestedBlock($block, array($name));
       break;
     default:
       $this->throwError("unknown block type: $block->type\n");
     }
   }
 
   protected function compileCSSBlock($block) {
     $env = $this->pushEnv();
 
     $selectors = $this->compileSelectors($block->tags);
     $env->selectors = $this->multiplySelectors($selectors);
     $out = $this->makeOutputBlock(null, $env->selectors);
 
     $this->scope->children[] = $out;
     $this->compileProps($block, $out);
 
     $block->scope = $env; // mixins carry scope with them!
     $this->popEnv();
   }
 
   protected function compileMedia($media) {
     $env = $this->pushEnv($media);
     $parentScope = $this->mediaParent($this->scope);
 
     $query = $this->compileMediaQuery($this->multiplyMedia($env));
 
     $this->scope = $this->makeOutputBlock($media->type, array($query));
     $parentScope->children[] = $this->scope;
 
     $this->compileProps($media, $this->scope);
 
     if (count($this->scope->lines) > 0) {
       $orphanSelelectors = $this->findClosestSelectors();
       if (!is_null($orphanSelelectors)) {
         $orphan = $this->makeOutputBlock(null, $orphanSelelectors);
         $orphan->lines = $this->scope->lines;
         array_unshift($this->scope->children, $orphan);
         $this->scope->lines = array();
       }
     }
 
     $this->scope = $this->scope->parent;
     $this->popEnv();
   }
 
   protected function mediaParent($scope) {
     while (!empty($scope->parent)) {
       if (!empty($scope->type) && $scope->type != "media") {
         break;
       }
       $scope = $scope->parent;
     }
 
     return $scope;
   }
 
   protected function compileNestedBlock($block, $selectors) {
     $this->pushEnv($block);
     $this->scope = $this->makeOutputBlock($block->type, $selectors);
     $this->scope->parent->children[] = $this->scope;
 
     $this->compileProps($block, $this->scope);
 
     $this->scope = $this->scope->parent;
     $this->popEnv();
   }
 
   protected function compileRoot($root) {
     $this->pushEnv();
     $this->scope = $this->makeOutputBlock($root->type);
     $this->compileProps($root, $this->scope);
     $this->popEnv();
   }
 
   protected function compileProps($block, $out) {
     foreach ($this->sortProps($block->props) as $prop) {
       $this->compileProp($prop, $block, $out);
     }
 
     $out->lines = array_values(array_unique($out->lines));
   }
 
   protected function sortProps($props, $split = false) {
     $vars = array();
     $imports = array();
     $other = array();
 
     foreach ($props as $prop) {
       switch ($prop[0]) {
       case "assign":
         if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix) {
           $vars[] = $prop;
         } else {
           $other[] = $prop;
         }
         break;
       case "import":
         $id = self::$nextImportId++;
         $prop[] = $id;
         $imports[] = $prop;
         $other[] = array("import_mixin", $id);
         break;
       default:
         $other[] = $prop;
       }
     }
 
     if ($split) {
       return array(array_merge($vars, $imports), $other);
     } else {
       return array_merge($vars, $imports, $other);
     }
   }
 
   protected function compileMediaQuery($queries) {
     $compiledQueries = array();
     foreach ($queries as $query) {
       $parts = array();
       foreach ($query as $q) {
         switch ($q[0]) {
         case "mediaType":
           $parts[] = implode(" ", array_slice($q, 1));
           break;
         case "mediaExp":
           if (isset($q[2])) {
             $parts[] = "($q[1]: " .
               $this->compileValue($this->reduce($q[2])) . ")";
           } else {
             $parts[] = "($q[1])";
           }
           break;
         case "variable":
           $parts[] = $this->compileValue($this->reduce($q));
         break;
         }
       }
 
       if (count($parts) > 0) {
         $compiledQueries[] =  implode(" and ", $parts);
       }
     }
 
     $out = "@media";
     if (!empty($parts)) {
       $out .= " " .
         implode($this->formatter->selectorSeparator, $compiledQueries);
     }
     return $out;
   }
 
   protected function multiplyMedia($env, $childQueries = null) {
     if (is_null($env) ||
       !empty($env->block->type) && $env->block->type != "media")
     {
       return $childQueries;
     }
 
     // plain old block, skip
     if (empty($env->block->type)) {
       return $this->multiplyMedia($env->parent, $childQueries);
     }
 
     $out = array();
     $queries = $env->block->queries;
     if (is_null($childQueries)) {
       $out = $queries;
     } else {
       foreach ($queries as $parent) {
         foreach ($childQueries as $child) {
           $out[] = array_merge($parent, $child);
         }
       }
     }
 
     return $this->multiplyMedia($env->parent, $out);
   }
 
   protected function expandParentSelectors(&$tag, $replace) {
     $parts = explode("$&$", $tag);
     $count = 0;
     foreach ($parts as &$part) {
       $part = str_replace($this->parentSelector, $replace, $part, $c);
       $count += $c;
     }
     $tag = implode($this->parentSelector, $parts);
     return $count;
   }
 
   protected function findClosestSelectors() {
     $env = $this->env;
     $selectors = null;
     while ($env !== null) {
       if (isset($env->selectors)) {
         $selectors = $env->selectors;
         break;
       }
       $env = $env->parent;
     }
 
     return $selectors;
   }
 
 
   // multiply $selectors against the nearest selectors in env
   protected function multiplySelectors($selectors) {
     // find parent selectors
 
     $parentSelectors = $this->findClosestSelectors();
     if (is_null($parentSelectors)) {
       // kill parent reference in top level selector
       foreach ($selectors as &$s) {
         $this->expandParentSelectors($s, "");
       }
 
       return $selectors;
     }
 
     $out = array();
     foreach ($parentSelectors as $parent) {
       foreach ($selectors as $child) {
         $count = $this->expandParentSelectors($child, $parent);
 
         // don't prepend the parent tag if & was used
         if ($count > 0) {
           $out[] = trim($child);
         } else {
           $out[] = trim($parent . ' ' . $child);
         }
       }
     }
 
     return $out;
   }
 
   // reduces selector expressions
   protected function compileSelectors($selectors) {
     $out = array();
 
     foreach ($selectors as $s) {
       if (is_array($s)) {
         list(, $value) = $s;
         $out[] = trim($this->compileValue($this->reduce($value)));
       } else {
         $out[] = $s;
       }
     }
 
     return $out;
   }
 
   protected function eq($left, $right) {
     return $left == $right;
   }
 
   protected function patternMatch($block, $orderedArgs, $keywordArgs) {
     // match the guards if it has them
     // any one of the groups must have all its guards pass for a match
     if (!empty($block->guards)) {
       $groupPassed = false;
       foreach ($block->guards as $guardGroup) {
         foreach ($guardGroup as $guard) {
           $this->pushEnv();
           $this->zipSetArgs($block->args, $orderedArgs, $keywordArgs);
 
           $negate = false;
           if ($guard[0] == "negate") {
             $guard = $guard[1];
             $negate = true;
           }
 
           $passed = $this->reduce($guard) == self::$TRUE;
           if ($negate) $passed = !$passed;
 
           $this->popEnv();
 
           if ($passed) {
             $groupPassed = true;
           } else {
             $groupPassed = false;
             break;
           }
         }
 
         if ($groupPassed) break;
       }
 
       if (!$groupPassed) {
         return false;
       }
     }
 
     if (empty($block->args)) {
       return $block->isVararg || empty($orderedArgs) && empty($keywordArgs);
     }
 
     $remainingArgs = $block->args;
     if ($keywordArgs) {
       $remainingArgs = array();
       foreach ($block->args as $arg) {
         if ($arg[0] == "arg" && isset($keywordArgs[$arg[1]])) {
           continue;
         }
 
         $remainingArgs[] = $arg;
       }
     }
 
     $i = -1; // no args
     // try to match by arity or by argument literal
     foreach ($remainingArgs as $i => $arg) {
       switch ($arg[0]) {
       case "lit":
         if (empty($orderedArgs[$i]) || !$this->eq($arg[1], $orderedArgs[$i])) {
           return false;
         }
         break;
       case "arg":
         // no arg and no default value
         if (!isset($orderedArgs[$i]) && !isset($arg[2])) {
           return false;
         }
         break;
       case "rest":
         $i--; // rest can be empty
         break 2;
       }
     }
 
     if ($block->isVararg) {
       return true; // not having enough is handled above
     } else {
       $numMatched = $i + 1;
       // greater than becuase default values always match
       return $numMatched >= count($orderedArgs);
     }
   }
 
   protected function patternMatchAll($blocks, $orderedArgs, $keywordArgs, $skip=array()) {
     $matches = null;
     foreach ($blocks as $block) {
       // skip seen blocks that don't have arguments
       if (isset($skip[$block->id]) && !isset($block->args)) {
         continue;
       }
 
       if ($this->patternMatch($block, $orderedArgs, $keywordArgs)) {
         $matches[] = $block;
       }
     }
 
     return $matches;
   }
 
   // attempt to find blocks matched by path and args
   protected function findBlocks($searchIn, $path, $orderedArgs, $keywordArgs, $seen=array()) {
     if ($searchIn == null) return null;
     if (isset($seen[$searchIn->id])) return null;
     $seen[$searchIn->id] = true;
 
     $name = $path[0];
 
     if (isset($searchIn->children[$name])) {
       $blocks = $searchIn->children[$name];
       if (count($path) == 1) {
         $matches = $this->patternMatchAll($blocks, $orderedArgs, $keywordArgs, $seen);
         if (!empty($matches)) {
           // This will return all blocks that match in the closest
           // scope that has any matching block, like lessjs
           return $matches;
         }
       } else {
         $matches = array();
         foreach ($blocks as $subBlock) {
           $subMatches = $this->findBlocks($subBlock,
             array_slice($path, 1), $orderedArgs, $keywordArgs, $seen);
 
           if (!is_null($subMatches)) {
             foreach ($subMatches as $sm) {
               $matches[] = $sm;
             }
           }
         }
 
         return count($matches) > 0 ? $matches : null;
       }
     }
     if ($searchIn->parent === $searchIn) return null;
     return $this->findBlocks($searchIn->parent, $path, $orderedArgs, $keywordArgs, $seen);
   }
 
   // sets all argument names in $args to either the default value
   // or the one passed in through $values
   protected function zipSetArgs($args, $orderedValues, $keywordValues) {
     $assignedValues = array();
 
     $i = 0;
     foreach ($args as  $a) {
       if ($a[0] == "arg") {
         if (isset($keywordValues[$a[1]])) {
           // has keyword arg
           $value = $keywordValues[$a[1]];
         } elseif (isset($orderedValues[$i])) {
           // has ordered arg
           $value = $orderedValues[$i];
           $i++;
         } elseif (isset($a[2])) {
           // has default value
           $value = $a[2];
         } else {
           $this->throwError("Failed to assign arg " . $a[1]);
           $value = null; // :(
         }
 
         $value = $this->reduce($value);
         $this->set($a[1], $value);
         $assignedValues[] = $value;
       } else {
         // a lit
         $i++;
       }
     }
 
     // check for a rest
     $last = end($args);
     if ($last[0] == "rest") {
       $rest = array_slice($orderedValues, count($args) - 1);
       $this->set($last[1], $this->reduce(array("list", " ", $rest)));
     }
 
     // wow is this the only true use of PHP's + operator for arrays?
     $this->env->arguments = $assignedValues + $orderedValues;
   }
 
   // compile a prop and update $lines or $blocks appropriately
   protected function compileProp($prop, $block, $out) {
     // set error position context
     $this->sourceLoc = isset($prop[-1]) ? $prop[-1] : -1;
 
     switch ($prop[0]) {
     case 'assign':
       list(, $name, $value) = $prop;
       if ($name[0] == $this->vPrefix) {
         $this->set($name, $value);
       } else {
         $out->lines[] = $this->formatter->property($name,
             $this->compileValue($this->reduce($value)));
       }
       break;
     case 'block':
       list(, $child) = $prop;
       $this->compileBlock($child);
       break;
     case 'mixin':
       list(, $path, $args, $suffix) = $prop;
 
       $orderedArgs = array();
       $keywordArgs = array();
       foreach ((array)$args as $arg) {
         $argval = null;
         switch ($arg[0]) {
         case "arg":
           if (!isset($arg[2])) {
             $orderedArgs[] = $this->reduce(array("variable", $arg[1]));
           } else {
             $keywordArgs[$arg[1]] = $this->reduce($arg[2]);
           }
           break;
 
         case "lit":
           $orderedArgs[] = $this->reduce($arg[1]);
           break;
         default:
           $this->throwError("Unknown arg type: " . $arg[0]);
         }
       }
 
       $mixins = $this->findBlocks($block, $path, $orderedArgs, $keywordArgs);
 
       if ($mixins === null) {
         // fwrite(STDERR,"failed to find block: ".implode(" > ", $path)."\n");
         break; // throw error here??
       }
 
       foreach ($mixins as $mixin) {
         if ($mixin === $block && !$orderedArgs) {
           continue;
         }
 
         $haveScope = false;
         if (isset($mixin->parent->scope)) {
           $haveScope = true;
           $mixinParentEnv = $this->pushEnv();
           $mixinParentEnv->storeParent = $mixin->parent->scope;
         }
 
         $haveArgs = false;
         if (isset($mixin->args)) {
           $haveArgs = true;
           $this->pushEnv();
           $this->zipSetArgs($mixin->args, $orderedArgs, $keywordArgs);
         }
 
         $oldParent = $mixin->parent;
         if ($mixin != $block) $mixin->parent = $block;
 
         foreach ($this->sortProps($mixin->props) as $subProp) {
           if ($suffix !== null &&
             $subProp[0] == "assign" &&
             is_string($subProp[1]) &&
             $subProp[1]{0} != $this->vPrefix)
           {
             $subProp[2] = array(
               'list', ' ',
               array($subProp[2], array('keyword', $suffix))
             );
           }
 
           $this->compileProp($subProp, $mixin, $out);
         }
 
         $mixin->parent = $oldParent;
 
         if ($haveArgs) $this->popEnv();
         if ($haveScope) $this->popEnv();
       }
 
       break;
     case 'raw':
       $out->lines[] = $prop[1];
       break;
     case "directive":
       list(, $name, $value) = $prop;
       $out->lines[] = "@$name " . $this->compileValue($this->reduce($value)).';';
       break;
     case "comment":
       $out->lines[] = $prop[1];
       break;
     case "import";
       list(, $importPath, $importId) = $prop;
       $importPath = $this->reduce($importPath);
 
       if (!isset($this->env->imports)) {
         $this->env->imports = array();
       }
 
       $result = $this->tryImport($importPath, $block, $out);
 
       $this->env->imports[$importId] = $result === false ?
         array(false, "@import " . $this->compileValue($importPath).";") :
         $result;
 
       break;
     case "import_mixin":
       list(,$importId) = $prop;
       $import = $this->env->imports[$importId];
       if ($import[0] === false) {
         if (isset($import[1])) {
           $out->lines[] = $import[1];
         }
       } else {
         list(, $bottom, $parser, $importDir) = $import;
         $this->compileImportedProps($bottom, $block, $out, $parser, $importDir);
       }
 
       break;
     default:
       $this->throwError("unknown op: {$prop[0]}\n");
     }
   }
 
 
   /**
    * Compiles a primitive value into a CSS property value.
    *
    * Values in lessphp are typed by being wrapped in arrays, their format is
    * typically:
    *
    *     array(type, contents [, additional_contents]*)
    *
    * The input is expected to be reduced. This function will not work on
    * things like expressions and variables.
    */
   protected function compileValue($value) {
     switch ($value[0]) {
     case 'list':
       // [1] - delimiter
       // [2] - array of values
       return implode($value[1], array_map(array($this, 'compileValue'), $value[2]));
     case 'raw_color':
       if (!empty($this->formatter->compressColors)) {
         return $this->compileValue($this->coerceColor($value));
       }
       return $value[1];
     case 'keyword':
       // [1] - the keyword
       return $value[1];
     case 'number':
       list(, $num, $unit) = $value;
       // [1] - the number
       // [2] - the unit
       if ($this->numberPrecision !== null) {
         $num = round($num, $this->numberPrecision);
       }
       return $num . $unit;
     case 'string':
       // [1] - contents of string (includes quotes)
       list(, $delim, $content) = $value;
       foreach ($content as &$part) {
         if (is_array($part)) {
           $part = $this->compileValue($part);
         }
       }
       return $delim . implode($content) . $delim;
     case 'color':
       // [1] - red component (either number or a %)
       // [2] - green component
       // [3] - blue component
       // [4] - optional alpha component
       list(, $r, $g, $b) = $value;
       $r = round($r);
       $g = round($g);
       $b = round($b);
 
       if (count($value) == 5 && $value[4] != 1) { // rgba
         return 'rgba('.$r.','.$g.','.$b.','.$value[4].')';
       }
 
       $h = sprintf("#%02x%02x%02x", $r, $g, $b);
 
       if (!empty($this->formatter->compressColors)) {
         // Converting hex color to short notation (e.g. #003399 to #039)
         if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
           $h = '#' . $h[1] . $h[3] . $h[5];
         }
       }
 
       return $h;
 
     case 'function':
       list(, $name, $args) = $value;
       return $name.'('.$this->compileValue($args).')';
     default: // assumed to be unit
       $this->throwError("unknown value type: $value[0]");
     }
   }
 
   protected function lib_pow($args) {
     list($base, $exp) = $this->assertArgs($args, 2, "pow");
     return pow($this->assertNumber($base), $this->assertNumber($exp));
   }
 
   protected function lib_pi() {
     return pi();
   }
 
   protected function lib_mod($args) {
     list($a, $b) = $this->assertArgs($args, 2, "mod");
     return $this->assertNumber($a) % $this->assertNumber($b);
   }
 
   protected function lib_tan($num) {
     return tan($this->assertNumber($num));
   }
 
   protected function lib_sin($num) {
     return sin($this->assertNumber($num));
   }
 
   protected function lib_cos($num) {
     return cos($this->assertNumber($num));
   }
 
   protected function lib_atan($num) {
     $num = atan($this->assertNumber($num));
     return array("number", $num, "rad");
   }
 
   protected function lib_asin($num) {
     $num = asin($this->assertNumber($num));
     return array("number", $num, "rad");
   }
 
   protected function lib_acos($num) {
     $num = acos($this->assertNumber($num));
     return array("number", $num, "rad");
   }
 
   protected function lib_sqrt($num) {
     return sqrt($this->assertNumber($num));
   }
 
   protected function lib_extract($value) {
     list($list, $idx) = $this->assertArgs($value, 2, "extract");
     $idx = $this->assertNumber($idx);
     // 1 indexed
     if ($list[0] == "list" && isset($list[2][$idx - 1])) {
       return $list[2][$idx - 1];
     }
   }
 
   protected function lib_isnumber($value) {
     return $this->toBool($value[0] == "number");
   }
 
   protected function lib_isstring($value) {
     return $this->toBool($value[0] == "string");
   }
 
   protected function lib_iscolor($value) {
     return $this->toBool($this->coerceColor($value));
   }
 
   protected function lib_iskeyword($value) {
     return $this->toBool($value[0] == "keyword");
   }
 
   protected function lib_ispixel($value) {
     return $this->toBool($value[0] == "number" && $value[2] == "px");
   }
 
   protected function lib_ispercentage($value) {
     return $this->toBool($value[0] == "number" && $value[2] == "%");
   }
 
   protected function lib_isem($value) {
     return $this->toBool($value[0] == "number" && $value[2] == "em");
   }
 
   protected function lib_isrem($value) {
     return $this->toBool($value[0] == "number" && $value[2] == "rem");
   }
 
   protected function lib_rgbahex($color) {
     $color = $this->coerceColor($color);
     if (is_null($color))
       $this->throwError("color expected for rgbahex");
 
     return sprintf("#%02x%02x%02x%02x",
       isset($color[4]) ? $color[4]*255 : 255,
       $color[1],$color[2], $color[3]);
   }
 
   protected function lib_argb($color){
     return $this->lib_rgbahex($color);
   }
 
   // utility func to unquote a string
   protected function lib_e($arg) {
     switch ($arg[0]) {
       case "list":
         $items = $arg[2];
         if (isset($items[0])) {
           return $this->lib_e($items[0]);
         }
         return self::$defaultValue;
       case "string":
         $arg[1] = "";
         return $arg;
       case "keyword":
         return $arg;
       default:
         return array("keyword", $this->compileValue($arg));
     }
   }
 
   protected function lib__sprintf($args) {
     if ($args[0] != "list") return $args;
     $values = $args[2];
     $string = array_shift($values);
     $template = $this->compileValue($this->lib_e($string));
 
     $i = 0;
     if (preg_match_all('/%[dsa]/', $template, $m)) {
       foreach ($m[0] as $match) {
         $val = isset($values[$i]) ?
           $this->reduce($values[$i]) : array('keyword', '');
 
         // lessjs compat, renders fully expanded color, not raw color
         if ($color = $this->coerceColor($val)) {
           $val = $color;
         }
 
         $i++;
         $rep = $this->compileValue($this->lib_e($val));
         $template = preg_replace('/'.self::preg_quote($match).'/',
           $rep, $template, 1);
       }
     }
 
     $d = $string[0] == "string" ? $string[1] : '"';
     return array("string", $d, array($template));
   }
 
   protected function lib_floor($arg) {
     $value = $this->assertNumber($arg);
     return array("number", floor($value), $arg[2]);
   }
 
   protected function lib_ceil($arg) {
     $value = $this->assertNumber($arg);
     return array("number", ceil($value), $arg[2]);
   }
 
   protected function lib_round($arg) {
     $value = $this->assertNumber($arg);
     return array("number", round($value), $arg[2]);
   }
 
   protected function lib_unit($arg) {
     if ($arg[0] == "list") {
       list($number, $newUnit) = $arg[2];
       return array("number", $this->assertNumber($number),
         $this->compileValue($this->lib_e($newUnit)));
     } else {
       return array("number", $this->assertNumber($arg), "");
     }
   }
 
   /**
    * Helper function to get arguments for color manipulation functions.
    * takes a list that contains a color like thing and a percentage
    */
   protected function colorArgs($args) {
     if ($args[0] != 'list' || count($args[2]) < 2) {
       return array(array('color', 0, 0, 0), 0);
     }
     list($color, $delta) = $args[2];
     $color = $this->assertColor($color);
     $delta = floatval($delta[1]);
 
     return array($color, $delta);
   }
 
   protected function lib_darken($args) {
     list($color, $delta) = $this->colorArgs($args);
 
     $hsl = $this->toHSL($color);
     $hsl[3] = $this->clamp($hsl[3] - $delta, 100);
     return $this->toRGB($hsl);
   }
 
   protected function lib_lighten($args) {
     list($color, $delta) = $this->colorArgs($args);
 
     $hsl = $this->toHSL($color);
     $hsl[3] = $this->clamp($hsl[3] + $delta, 100);
     return $this->toRGB($hsl);
   }
 
   protected function lib_saturate($args) {
     list($color, $delta) = $this->colorArgs($args);
 
     $hsl = $this->toHSL($color);
     $hsl[2] = $this->clamp($hsl[2] + $delta, 100);
     return $this->toRGB($hsl);
   }
 
   protected function lib_desaturate($args) {
     list($color, $delta) = $this->colorArgs($args);
 
     $hsl = $this->toHSL($color);
     $hsl[2] = $this->clamp($hsl[2] - $delta, 100);
     return $this->toRGB($hsl);
   }
 
   protected function lib_spin($args) {
     list($color, $delta) = $this->colorArgs($args);
 
     $hsl = $this->toHSL($color);
 
     $hsl[1] = $hsl[1] + $delta % 360;
     if ($hsl[1] < 0) $hsl[1] += 360;
 
     return $this->toRGB($hsl);
   }
 
   protected function lib_fadeout($args) {
     list($color, $delta) = $this->colorArgs($args);
     $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
     return $color;
   }
 
   protected function lib_fadein($args) {
     list($color, $delta) = $this->colorArgs($args);
     $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
     return $color;
   }
 
   protected function lib_hue($color) {
     $hsl = $this->toHSL($this->assertColor($color));
     return round($hsl[1]);
   }
 
   protected function lib_saturation($color) {
     $hsl = $this->toHSL($this->assertColor($color));
     return round($hsl[2]);
   }
 
   protected function lib_lightness($color) {
     $hsl = $this->toHSL($this->assertColor($color));
     return round($hsl[3]);
   }
 
   // get the alpha of a color
   // defaults to 1 for non-colors or colors without an alpha
   protected function lib_alpha($value) {
     if (!is_null($color = $this->coerceColor($value))) {
       return isset($color[4]) ? $color[4] : 1;
     }
   }
 
   // set the alpha of the color
   protected function lib_fade($args) {
     list($color, $alpha) = $this->colorArgs($args);
     $color[4] = $this->clamp($alpha / 100.0);
     return $color;
   }
 
   protected function lib_percentage($arg) {
     $num = $this->assertNumber($arg);
     return array("number", $num*100, "%");
   }
 
   // mixes two colors by weight
   // mix(@color1, @color2, [@weight: 50%]);
   // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
   protected function lib_mix($args) {
     if ($args[0] != "list" || count($args[2]) < 2)
       $this->throwError("mix expects (color1, color2, weight)");
 
     list($first, $second) = $args[2];
     $first = $this->assertColor($first);
     $second = $this->assertColor($second);
 
     $first_a = $this->lib_alpha($first);
     $second_a = $this->lib_alpha($second);
 
     if (isset($args[2][2])) {
       $weight = $args[2][2][1] / 100.0;
     } else {
       $weight = 0.5;
     }
 
     $w = $weight * 2 - 1;
     $a = $first_a - $second_a;
 
     $w1 = (($w * $a == -1 ? $w : ($w + $a)/(1 + $w * $a)) + 1) / 2.0;
     $w2 = 1.0 - $w1;
 
     $new = array('color',
       $w1 * $first[1] + $w2 * $second[1],
       $w1 * $first[2] + $w2 * $second[2],
       $w1 * $first[3] + $w2 * $second[3],
     );
 
     if ($first_a != 1.0 || $second_a != 1.0) {
       $new[] = $first_a * $weight + $second_a * ($weight - 1);
     }
 
     return $this->fixColor($new);
   }
 
   protected function lib_contrast($args) {
     if ($args[0] != 'list' || count($args[2]) < 3) {
       return array(array('color', 0, 0, 0), 0);
     }
 
     list($inputColor, $darkColor, $lightColor) = $args[2];
 
     $inputColor = $this->assertColor($inputColor);
     $darkColor = $this->assertColor($darkColor);
     $lightColor = $this->assertColor($lightColor);
     $hsl = $this->toHSL($inputColor);
 
     if ($hsl[3] > 50) {
       return $darkColor;
     }
 
     return $lightColor;
   }
 
   protected function assertColor($value, $error = "expected color value") {
     $color = $this->coerceColor($value);
     if (is_null($color)) $this->throwError($error);
     return $color;
   }
 
   protected function assertNumber($value, $error = "expecting number") {
     if ($value[0] == "number") return $value[1];
     $this->throwError($error);
   }
 
   protected function assertArgs($value, $expectedArgs, $name="") {
     if ($expectedArgs == 1) {
       return $value;
     } else {
       if ($value[0] !== "list" || $value[1] != ",") $this->throwError("expecting list");
       $values = $value[2];
       $numValues = count($values);
       if ($expectedArgs != $numValues) {
         if ($name) {
           $name = $name . ": ";
         }
 
         $this->throwError("${name}expecting $expectedArgs arguments, got $numValues");
       }
 
       return $values;
     }
   }
 
   protected function toHSL($color) {
     if ($color[0] == 'hsl') return $color;
 
     $r = $color[1] / 255;
     $g = $color[2] / 255;
     $b = $color[3] / 255;
 
     $min = min($r, $g, $b);
     $max = max($r, $g, $b);
 
     $L = ($min + $max) / 2;
     if ($min == $max) {
       $S = $H = 0;
     } else {
       if ($L < 0.5)
         $S = ($max - $min)/($max + $min);
       else
         $S = ($max - $min)/(2.0 - $max - $min);
 
       if ($r == $max) $H = ($g - $b)/($max - $min);
       elseif ($g == $max) $H = 2.0 + ($b - $r)/($max - $min);
       elseif ($b == $max) $H = 4.0 + ($r - $g)/($max - $min);
 
     }
 
     $out = array('hsl',
       ($H < 0 ? $H + 6 : $H)*60,
       $S*100,
       $L*100,
     );
 
     if (count($color) > 4) $out[] = $color[4]; // copy alpha
     return $out;
   }
 
   protected function toRGB_helper($comp, $temp1, $temp2) {
     if ($comp < 0) $comp += 1.0;
     elseif ($comp > 1) $comp -= 1.0;
 
     if (6 * $comp < 1) return $temp1 + ($temp2 - $temp1) * 6 * $comp;
     if (2 * $comp < 1) return $temp2;
     if (3 * $comp < 2) return $temp1 + ($temp2 - $temp1)*((2/3) - $comp) * 6;
 
     return $temp1;
   }
 
   /**
    * Converts a hsl array into a color value in rgb.
    * Expects H to be in range of 0 to 360, S and L in 0 to 100
    */
   protected function toRGB($color) {
     if ($color[0] == 'color') return $color;
 
     $H = $color[1] / 360;
     $S = $color[2] / 100;
     $L = $color[3] / 100;
 
     if ($S == 0) {
       $r = $g = $b = $L;
     } else {
       $temp2 = $L < 0.5 ?
         $L*(1.0 + $S) :
         $L + $S - $L * $S;
 
       $temp1 = 2.0 * $L - $temp2;
 
       $r = $this->toRGB_helper($H + 1/3, $temp1, $temp2);
       $g = $this->toRGB_helper($H, $temp1, $temp2);
       $b = $this->toRGB_helper($H - 1/3, $temp1, $temp2);
     }
 
     // $out = array('color', round($r*255), round($g*255), round($b*255));
     $out = array('color', $r*255, $g*255, $b*255);
     if (count($color) > 4) $out[] = $color[4]; // copy alpha
     return $out;
   }
 
   protected function clamp($v, $max = 1, $min = 0) {
     return min($max, max($min, $v));
   }
 
   /**
    * Convert the rgb, rgba, hsl color literals of function type
    * as returned by the parser into values of color type.
    */
   protected function funcToColor($func) {
     $fname = $func[1];
     if ($func[2][0] != 'list') return false; // need a list of arguments
     $rawComponents = $func[2][2];
 
     if ($fname == 'hsl' || $fname == 'hsla') {
       $hsl = array('hsl');
       $i = 0;
       foreach ($rawComponents as $c) {
         $val = $this->reduce($c);
         $val = isset($val[1]) ? floatval($val[1]) : 0;
 
         if ($i == 0) $clamp = 360;
         elseif ($i < 3) $clamp = 100;
         else $clamp = 1;
 
         $hsl[] = $this->clamp($val, $clamp);
         $i++;
       }
 
       while (count($hsl) < 4) $hsl[] = 0;
       return $this->toRGB($hsl);
 
     } elseif ($fname == 'rgb' || $fname == 'rgba') {
       $components = array();
       $i = 1;
       foreach ($rawComponents as $c) {
         $c = $this->reduce($c);
         if ($i < 4) {
           if ($c[0] == "number" && $c[2] == "%") {
             $components[] = 255 * ($c[1] / 100);
           } else {
             $components[] = floatval($c[1]);
           }
         } elseif ($i == 4) {
           if ($c[0] == "number" && $c[2] == "%") {
             $components[] = 1.0 * ($c[1] / 100);
           } else {
             $components[] = floatval($c[1]);
           }
         } else break;
 
         $i++;
       }
       while (count($components) < 3) $components[] = 0;
       array_unshift($components, 'color');
       return $this->fixColor($components);
     }
 
     return false;
   }
 
   protected function reduce($value, $forExpression = false) {
     switch ($value[0]) {
     case "interpolate":
       $reduced = $this->reduce($value[1]);
       $var = $this->compileValue($reduced);
       $res = $this->reduce(array("variable", $this->vPrefix . $var));
 
       if ($res[0] == "raw_color") {
         $res = $this->coerceColor($res);
       }
 
       if (empty($value[2])) $res = $this->lib_e($res);
 
       return $res;
     case "variable":
       $key = $value[1];
       if (is_array($key)) {
         $key = $this->reduce($key);
         $key = $this->vPrefix . $this->compileValue($this->lib_e($key));
       }
 
       $seen =& $this->env->seenNames;
 
       if (!empty($seen[$key])) {
         $this->throwError("infinite loop detected: $key");
       }
 
       $seen[$key] = true;
       $out = $this->reduce($this->get($key, self::$defaultValue));
       $seen[$key] = false;
       return $out;
     case "list":
       foreach ($value[2] as &$item) {
         $item = $this->reduce($item, $forExpression);
       }
       return $value;
     case "expression":
       return $this->evaluate($value);
     case "string":
       foreach ($value[2] as &$part) {
         if (is_array($part)) {
           $strip = $part[0] == "variable";
           $part = $this->reduce($part);
           if ($strip) $part = $this->lib_e($part);
         }
       }
       return $value;
     case "escape":
       list(,$inner) = $value;
       return $this->lib_e($this->reduce($inner));
     case "function":
       $color = $this->funcToColor($value);
       if ($color) return $color;
 
       list(, $name, $args) = $value;
       if ($name == "%") $name = "_sprintf";
       $f = isset($this->libFunctions[$name]) ?
         $this->libFunctions[$name] : array($this, 'lib_'.$name);
 
       if (is_callable($f)) {
         if ($args[0] == 'list')
           $args = self::compressList($args[2], $args[1]);
 
         $ret = call_user_func($f, $this->reduce($args, true), $this);
 
         if (is_null($ret)) {
           return array("string", "", array(
             $name, "(", $args, ")"
           ));
         }
 
         // convert to a typed value if the result is a php primitive
         if (is_numeric($ret)) $ret = array('number', $ret, "");
         elseif (!is_array($ret)) $ret = array('keyword', $ret);
 
         return $ret;
       }
 
       // plain function, reduce args
       $value[2] = $this->reduce($value[2]);
       return $value;
     case "unary":
       list(, $op, $exp) = $value;
       $exp = $this->reduce($exp);
 
       if ($exp[0] == "number") {
         switch ($op) {
         case "+":
           return $exp;
         case "-":
           $exp[1] *= -1;
           return $exp;
         }
       }
       return array("string", "", array($op, $exp));
     }
 
     if ($forExpression) {
       switch ($value[0]) {
       case "keyword":
         if ($color = $this->coerceColor($value)) {
           return $color;
         }
         break;
       case "raw_color":
         return $this->coerceColor($value);
       }
     }
 
     return $value;
   }
 
 
   // coerce a value for use in color operation
   protected function coerceColor($value) {
     switch($value[0]) {
       case 'color': return $value;
       case 'raw_color':
         $c = array("color", 0, 0, 0);
         $colorStr = substr($value[1], 1);
         $num = hexdec($colorStr);
         $width = strlen($colorStr) == 3 ? 16 : 256;
 
         for ($i = 3; $i > 0; $i--) { // 3 2 1
           $t = $num % $width;
           $num /= $width;
 
           $c[$i] = $t * (256/$width) + $t * floor(16/$width);
         }
 
         return $c;
       case 'keyword':
         $name = $value[1];
         if (isset(self::$cssColors[$name])) {
           $rgba = explode(',', self::$cssColors[$name]);
 
           if(isset($rgba[3]))
             return array('color', $rgba[0], $rgba[1], $rgba[2], $rgba[3]);
 
           return array('color', $rgba[0], $rgba[1], $rgba[2]);
         }
         return null;
     }
   }
 
   // make something string like into a string
   protected function coerceString($value) {
     switch ($value[0]) {
     case "string":
       return $value;
     case "keyword":
       return array("string", "", array($value[1]));
     }
     return null;
   }
 
   // turn list of length 1 into value type
   protected function flattenList($value) {
     if ($value[0] == "list" && count($value[2]) == 1) {
       return $this->flattenList($value[2][0]);
     }
     return $value;
   }
 
   protected function toBool($a) {
     if ($a) return self::$TRUE;
     else return self::$FALSE;
   }
 
   // evaluate an expression
   protected function evaluate($exp) {
     list(, $op, $left, $right, $whiteBefore, $whiteAfter) = $exp;
 
     $left = $this->reduce($left, true);
     $right = $this->reduce($right, true);
 
     if ($leftColor = $this->coerceColor($left)) {
       $left = $leftColor;
     }
 
     if ($rightColor = $this->coerceColor($right)) {
       $right = $rightColor;
     }
 
     $ltype = $left[0];
     $rtype = $right[0];
 
     // operators that work on all types
     if ($op == "and") {
       return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
     }
 
     if ($op == "=") {
       return $this->toBool($this->eq($left, $right) );
     }
 
     if ($op == "+" && !is_null($str = $this->stringConcatenate($left, $right))) {
       return $str;
     }
 
     // type based operators
     $fname = "op_${ltype}_${rtype}";
     if (is_callable(array($this, $fname))) {
       $out = $this->$fname($op, $left, $right);
       if (!is_null($out)) return $out;
     }
 
     // make the expression look it did before being parsed
     $paddedOp = $op;
     if ($whiteBefore) $paddedOp = " " . $paddedOp;
     if ($whiteAfter) $paddedOp .= " ";
 
     return array("string", "", array($left, $paddedOp, $right));
   }
 
   protected function stringConcatenate($left, $right) {
     if ($strLeft = $this->coerceString($left)) {
       if ($right[0] == "string") {
         $right[1] = "";
       }
       $strLeft[2][] = $right;
       return $strLeft;
     }
 
     if ($strRight = $this->coerceString($right)) {
       array_unshift($strRight[2], $left);
       return $strRight;
     }
   }
 
 
   // make sure a color's components don't go out of bounds
   protected function fixColor($c) {
     foreach (range(1, 3) as $i) {
       if ($c[$i] < 0) $c[$i] = 0;
       if ($c[$i] > 255) $c[$i] = 255;
     }
 
     return $c;
   }
 
   protected function op_number_color($op, $lft, $rgt) {
     if ($op == '+' || $op == '*') {
       return $this->op_color_number($op, $rgt, $lft);
     }
   }
 
   protected function op_color_number($op, $lft, $rgt) {
     if ($rgt[0] == '%') $rgt[1] /= 100;
 
     return $this->op_color_color($op, $lft,
       array_fill(1, count($lft) - 1, $rgt[1]));
   }
 
   protected function op_color_color($op, $left, $right) {
     $out = array('color');
     $max = count($left) > count($right) ? count($left) : count($right);
     foreach (range(1, $max - 1) as $i) {
       $lval = isset($left[$i]) ? $left[$i] : 0;
       $rval = isset($right[$i]) ? $right[$i] : 0;
       switch ($op) {
       case '+':
         $out[] = $lval + $rval;
         break;
       case '-':
         $out[] = $lval - $rval;
         break;
       case '*':
         $out[] = $lval * $rval;
         break;
       case '%':
         $out[] = $lval % $rval;
         break;
       case '/':
         if ($rval == 0) $this->throwError("evaluate error: can't divide by zero");
         $out[] = $lval / $rval;
         break;
       default:
         $this->throwError('evaluate error: color op number failed on op '.$op);
       }
     }
     return $this->fixColor($out);
   }
 
   function lib_red($color){
     $color = $this->coerceColor($color);
     if (is_null($color)) {
       $this->throwError('color expected for red()');
     }
 
     return $color[1];
   }
 
   function lib_green($color){
     $color = $this->coerceColor($color);
     if (is_null($color)) {
       $this->throwError('color expected for green()');
     }
 
     return $color[2];
   }
 
   function lib_blue($color){
     $color = $this->coerceColor($color);
     if (is_null($color)) {
       $this->throwError('color expected for blue()');
     }
 
     return $color[3];
   }
 
 
   // operator on two numbers
   protected function op_number_number($op, $left, $right) {
     $unit = empty($left[2]) ? $right[2] : $left[2];
 
     $value = 0;
     switch ($op) {
     case '+':
       $value = $left[1] + $right[1];
       break;
     case '*':
       $value = $left[1] * $right[1];
       break;
     case '-':
       $value = $left[1] - $right[1];
       break;
     case '%':
       $value = $left[1] % $right[1];
       break;
     case '/':
       if ($right[1] == 0) $this->throwError('parse error: divide by zero');
       $value = $left[1] / $right[1];
       break;
     case '<':
       return $this->toBool($left[1] < $right[1]);
     case '>':
       return $this->toBool($left[1] > $right[1]);
     case '>=':
       return $this->toBool($left[1] >= $right[1]);
     case '=<':
       return $this->toBool($left[1] <= $right[1]);
     default:
       $this->throwError('parse error: unknown number operator: '.$op);
     }
 
     return array("number", $value, $unit);
   }
 
 
   /* environment functions */
 
   protected function makeOutputBlock($type, $selectors = null) {
     $b = new stdclass;
     $b->lines = array();
     $b->children = array();
     $b->selectors = $selectors;
     $b->type = $type;
     $b->parent = $this->scope;
     return $b;
   }
 
   // the state of execution
   protected function pushEnv($block = null) {
     $e = new stdclass;
     $e->parent = $this->env;
     $e->store = array();
     $e->block = $block;
 
     $this->env = $e;
     return $e;
   }
 
   // pop something off the stack
   protected function popEnv() {
     $old = $this->env;
     $this->env = $this->env->parent;
     return $old;
   }
 
   // set something in the current env
   protected function set($name, $value) {
     $this->env->store[$name] = $value;
   }
 
 
   // get the highest occurrence entry for a name
   protected function get($name, $default=null) {
     $current = $this->env;
 
     $isArguments = $name == $this->vPrefix . 'arguments';
     while ($current) {
       if ($isArguments && isset($current->arguments)) {
         return array('list', ' ', $current->arguments);
       }
 
       if (isset($current->store[$name]))
         return $current->store[$name];
       else {
         $current = isset($current->storeParent) ?
           $current->storeParent : $current->parent;
       }
     }
 
     return $default;
   }
 
   // inject array of unparsed strings into environment as variables
   protected function injectVariables($args) {
     $this->pushEnv();
     $parser = new lessc_parser($this, __METHOD__);
     foreach ($args as $name => $strValue) {
       if ($name{0} != '@') $name = '@'.$name;
       $parser->count = 0;
       $parser->buffer = (string)$strValue;
       if (!$parser->propertyValue($value)) {
         throw new Exception("failed to parse passed in variable $name: $strValue");
       }
 
       $this->set($name, $value);
     }
   }
 
   /**
    * Initialize any static state, can initialize parser for a file
    * $opts isn't used yet
    */
   public function __construct($fname = null) {
     if ($fname !== null) {
       // used for deprecated parse method
       $this->_parseFile = $fname;
     }
   }
 
   public function compile($string, $name = null) {
     $locale = setlocale(LC_NUMERIC, 0);
     setlocale(LC_NUMERIC, "C");
 
     $this->parser = $this->makeParser($name);
     $root = $this->parser->parse($string);
 
     $this->env = null;
     $this->scope = null;
 
     $this->formatter = $this->newFormatter();
 
     if (!empty($this->registeredVars)) {
       $this->injectVariables($this->registeredVars);
     }
 
     $this->sourceParser = $this->parser; // used for error messages
     $this->compileBlock($root);
 
     ob_start();
     $this->formatter->block($this->scope);
     $out = ob_get_clean();
     setlocale(LC_NUMERIC, $locale);
     return $out;
   }
 
   public function compileFile($fname, $outFname = null) {
     if (!is_readable($fname)) {
       throw new Exception('load error: failed to find '.$fname);
     }
 
     $pi = pathinfo($fname);
 
     $oldImport = $this->importDir;
 
     $this->importDir = (array)$this->importDir;
     $this->importDir[] = $pi['dirname'].'/';
 
     $this->addParsedFile($fname);
 
     $out = $this->compile(file_get_contents($fname), $fname);
 
     $this->importDir = $oldImport;
 
     if ($outFname !== null) {
       return file_put_contents($outFname, $out);
     }
 
     return $out;
   }
 
   // compile only if changed input has changed or output doesn't exist
   public function checkedCompile($in, $out) {
     if (!is_file($out) || filemtime($in) > filemtime($out)) {
       $this->compileFile($in, $out);
       return true;
     }
     return false;
   }
 
   /**
    * Execute lessphp on a .less file or a lessphp cache structure
    *
    * The lessphp cache structure contains information about a specific
    * less file having been parsed. It can be used as a hint for future
    * calls to determine whether or not a rebuild is required.
    *
    * The cache structure contains two important keys that may be used
    * externally:
    *
    * compiled: The final compiled CSS
    * updated: The time (in seconds) the CSS was last compiled
    *
    * The cache structure is a plain-ol' PHP associative array and can
    * be serialized and unserialized without a hitch.
    *
    * @param mixed $in Input
    * @param bool $force Force rebuild?
    * @return array lessphp cache structure
    */
   public function cachedCompile($in, $force = false) {
     // assume no root
     $root = null;
 
     if (is_string($in)) {
       $root = $in;
     } elseif (is_array($in) and isset($in['root'])) {
       if ($force or ! isset($in['files'])) {
         // If we are forcing a recompile or if for some reason the
         // structure does not contain any file information we should
         // specify the root to trigger a rebuild.
         $root = $in['root'];
       } elseif (isset($in['files']) and is_array($in['files'])) {
         foreach ($in['files'] as $fname => $ftime ) {
           if (!file_exists($fname) or filemtime($fname) > $ftime) {
             // One of the files we knew about previously has changed
             // so we should look at our incoming root again.
             $root = $in['root'];
             break;
           }
         }
       }
     } else {
       // TODO: Throw an exception? We got neither a string nor something
       // that looks like a compatible lessphp cache structure.
       return null;
     }
 
     if ($root !== null) {
       // If we have a root value which means we should rebuild.
       $out = array();
       $out['root'] = $root;
       $out['compiled'] = $this->compileFile($root);
       $out['files'] = $this->allParsedFiles();
       $out['updated'] = time();
       return $out;
     } else {
       // No changes, pass back the structure
       // we were given initially.
       return $in;
     }
 
   }
 
   // parse and compile buffer
   // This is deprecated
   public function parse($str = null, $initialVariables = null) {
     if (is_array($str)) {
       $initialVariables = $str;
       $str = null;
     }
 
     $oldVars = $this->registeredVars;
     if ($initialVariables !== null) {
       $this->setVariables($initialVariables);
     }
 
     if ($str == null) {
       if (empty($this->_parseFile)) {
         throw new exception("nothing to parse");
       }
 
       $out = $this->compileFile($this->_parseFile);
     } else {
       $out = $this->compile($str);
     }
 
     $this->registeredVars = $oldVars;
     return $out;
   }
 
   protected function makeParser($name) {
     $parser = new lessc_parser($this, $name);
     $parser->writeComments = $this->preserveComments;
 
     return $parser;
   }
 
   public function setFormatter($name) {
     $this->formatterName = $name;
   }
 
   protected function newFormatter() {
     $className = "lessc_formatter_lessjs";
     if (!empty($this->formatterName)) {
       if (!is_string($this->formatterName))
         return $this->formatterName;
       $className = "lessc_formatter_$this->formatterName";
     }
 
     return new $className;
   }
 
   public function setPreserveComments($preserve) {
     $this->preserveComments = $preserve;
   }
 
   public function registerFunction($name, $func) {
     $this->libFunctions[$name] = $func;
   }
 
   public function unregisterFunction($name) {
     unset($this->libFunctions[$name]);
   }
 
   public function setVariables($variables) {
     $this->registeredVars = array_merge($this->registeredVars, $variables);
   }
 
   public function unsetVariable($name) {
     unset($this->registeredVars[$name]);
   }
 
   public function setImportDir($dirs) {
     $this->importDir = (array)$dirs;
   }
 
   public function addImportDir($dir) {
     $this->importDir = (array)$this->importDir;
     $this->importDir[] = $dir;
   }
 
   public function allParsedFiles() {
     return $this->allParsedFiles;
   }
 
   protected function addParsedFile($file) {
     $this->allParsedFiles[realpath($file)] = filemtime($file);
   }
 
   /**
    * Uses the current value of $this->count to show line and line number
    */
   protected function throwError($msg = null) {
     if ($this->sourceLoc >= 0) {
       $this->sourceParser->throwError($msg, $this->sourceLoc);
     }
     throw new exception($msg);
   }
 
   // compile file $in to file $out if $in is newer than $out
   // returns true when it compiles, false otherwise
   public static function ccompile($in, $out, $less = null) {
     if ($less === null) {
       $less = new self;
     }
     return $less->checkedCompile($in, $out);
   }
 
   public static function cexecute($in, $force = false, $less = null) {
     if ($less === null) {
       $less = new self;
     }
     return $less->cachedCompile($in, $force);
   }
 
   static protected $cssColors = array(
     'aliceblue' => '240,248,255',
     'antiquewhite' => '250,235,215',
     'aqua' => '0,255,255',
     'aquamarine' => '127,255,212',
     'azure' => '240,255,255',
     'beige' => '245,245,220',
     'bisque' => '255,228,196',
     'black' => '0,0,0',
     'blanchedalmond' => '255,235,205',
     'blue' => '0,0,255',
     'blueviolet' => '138,43,226',
     'brown' => '165,42,42',
     'burlywood' => '222,184,135',
     'cadetblue' => '95,158,160',
     'chartreuse' => '127,255,0',
     'chocolate' => '210,105,30',
     'coral' => '255,127,80',
     'cornflowerblue' => '100,149,237',
     'cornsilk' => '255,248,220',
     'crimson' => '220,20,60',
     'cyan' => '0,255,255',
     'darkblue' => '0,0,139',
     'darkcyan' => '0,139,139',
     'darkgoldenrod' => '184,134,11',
     'darkgray' => '169,169,169',
     'darkgreen' => '0,100,0',
     'darkgrey' => '169,169,169',
     'darkkhaki' => '189,183,107',
     'darkmagenta' => '139,0,139',
     'darkolivegreen' => '85,107,47',
     'darkorange' => '255,140,0',
     'darkorchid' => '153,50,204',
     'darkred' => '139,0,0',
     'darksalmon' => '233,150,122',
     'darkseagreen' => '143,188,143',
     'darkslateblue' => '72,61,139',
     'darkslategray' => '47,79,79',
     'darkslategrey' => '47,79,79',
     'darkturquoise' => '0,206,209',
     'darkviolet' => '148,0,211',
     'deeppink' => '255,20,147',
     'deepskyblue' => '0,191,255',
     'dimgray' => '105,105,105',
     'dimgrey' => '105,105,105',
     'dodgerblue' => '30,144,255',
     'firebrick' => '178,34,34',
     'floralwhite' => '255,250,240',
     'forestgreen' => '34,139,34',
     'fuchsia' => '255,0,255',
     'gainsboro' => '220,220,220',
     'ghostwhite' => '248,248,255',
     'gold' => '255,215,0',
     'goldenrod' => '218,165,32',
     'gray' => '128,128,128',
     'green' => '0,128,0',
     'greenyellow' => '173,255,47',
     'grey' => '128,128,128',
     'honeydew' => '240,255,240',
     'hotpink' => '255,105,180',
     'indianred' => '205,92,92',
     'indigo' => '75,0,130',
     'ivory' => '255,255,240',
     'khaki' => '240,230,140',
     'lavender' => '230,230,250',
     'lavenderblush' => '255,240,245',
     'lawngreen' => '124,252,0',
     'lemonchiffon' => '255,250,205',
     'lightblue' => '173,216,230',
     'lightcoral' => '240,128,128',
     'lightcyan' => '224,255,255',
     'lightgoldenrodyellow' => '250,250,210',
     'lightgray' => '211,211,211',
     'lightgreen' => '144,238,144',
     'lightgrey' => '211,211,211',
     'lightpink' => '255,182,193',
     'lightsalmon' => '255,160,122',
     'lightseagreen' => '32,178,170',
     'lightskyblue' => '135,206,250',
     'lightslategray' => '119,136,153',
     'lightslategrey' => '119,136,153',
     'lightsteelblue' => '176,196,222',
     'lightyellow' => '255,255,224',
     'lime' => '0,255,0',
     'limegreen' => '50,205,50',
     'linen' => '250,240,230',
     'magenta' => '255,0,255',
     'maroon' => '128,0,0',
     'mediumaquamarine' => '102,205,170',
     'mediumblue' => '0,0,205',
     'mediumorchid' => '186,85,211',
     'mediumpurple' => '147,112,219',
     'mediumseagreen' => '60,179,113',
     'mediumslateblue' => '123,104,238',
     'mediumspringgreen' => '0,250,154',
     'mediumturquoise' => '72,209,204',
     'mediumvioletred' => '199,21,133',
     'midnightblue' => '25,25,112',
     'mintcream' => '245,255,250',
     'mistyrose' => '255,228,225',
     'moccasin' => '255,228,181',
     'navajowhite' => '255,222,173',
     'navy' => '0,0,128',
     'oldlace' => '253,245,230',
     'olive' => '128,128,0',
     'olivedrab' => '107,142,35',
     'orange' => '255,165,0',
     'orangered' => '255,69,0',
     'orchid' => '218,112,214',
     'palegoldenrod' => '238,232,170',
     'palegreen' => '152,251,152',
     'paleturquoise' => '175,238,238',
     'palevioletred' => '219,112,147',
     'papayawhip' => '255,239,213',
     'peachpuff' => '255,218,185',
     'peru' => '205,133,63',
     'pink' => '255,192,203',
     'plum' => '221,160,221',
     'powderblue' => '176,224,230',
     'purple' => '128,0,128',
     'red' => '255,0,0',
     'rosybrown' => '188,143,143',
     'royalblue' => '65,105,225',
     'saddlebrown' => '139,69,19',
     'salmon' => '250,128,114',
     'sandybrown' => '244,164,96',
     'seagreen' => '46,139,87',
     'seashell' => '255,245,238',
     'sienna' => '160,82,45',
     'silver' => '192,192,192',
     'skyblue' => '135,206,235',
     'slateblue' => '106,90,205',
     'slategray' => '112,128,144',
     'slategrey' => '112,128,144',
     'snow' => '255,250,250',
     'springgreen' => '0,255,127',
     'steelblue' => '70,130,180',
     'tan' => '210,180,140',
     'teal' => '0,128,128',
     'thistle' => '216,191,216',
     'tomato' => '255,99,71',
     'transparent' => '0,0,0,0',
     'turquoise' => '64,224,208',
     'violet' => '238,130,238',
     'wheat' => '245,222,179',
     'white' => '255,255,255',
     'whitesmoke' => '245,245,245',
     'yellow' => '255,255,0',
     'yellowgreen' => '154,205,50'
   );
 }
 
 // responsible for taking a string of LESS code and converting it into a
 // syntax tree
 class lessc_parser {
   static protected $nextBlockId = 0; // used to uniquely identify blocks
 
   static protected $precedence = array(
     '=<' => 0,
     '>=' => 0,
     '=' => 0,
     '<' => 0,
     '>' => 0,
 
     '+' => 1,
     '-' => 1,
     '*' => 2,
     '/' => 2,
     '%' => 2,
   );
 
   static protected $whitePattern;
   static protected $commentMulti;
 
   static protected $commentSingle = "//";
   static protected $commentMultiLeft = "/*";
   static protected $commentMultiRight = "*/";
 
   // regex string to match any of the operators
   static protected $operatorString;
 
   // these properties will supress division unless it's inside parenthases
   static protected $supressDivisionProps =
     array('/border-radius$/i', '/^font$/i');
 
   protected $blockDirectives = array("font-face", "keyframes", "page", "-moz-document", "viewport", "-moz-viewport", "-o-viewport", "-ms-viewport");
   protected $lineDirectives = array("charset");
 
   /**
    * if we are in parens we can be more liberal with whitespace around
    * operators because it must evaluate to a single value and thus is less
    * ambiguous.
    *
    * Consider:
    *     property1: 10 -5; // is two numbers, 10 and -5
    *     property2: (10 -5); // should evaluate to 5
    */
   protected $inParens = false;
 
   // caches preg escaped literals
   static protected $literalCache = array();
 
   public function __construct($lessc, $sourceName = null) {
     $this->eatWhiteDefault = true;
     // reference to less needed for vPrefix, mPrefix, and parentSelector
     $this->lessc = $lessc;
 
     $this->sourceName = $sourceName; // name used for error messages
 
     $this->writeComments = false;
 
     if (!self::$operatorString) {
       self::$operatorString =
         '('.implode('|', array_map(array('lessc', 'preg_quote'),
           array_keys(self::$precedence))).')';
 
       $commentSingle = lessc::preg_quote(self::$commentSingle);
       $commentMultiLeft = lessc::preg_quote(self::$commentMultiLeft);
       $commentMultiRight = lessc::preg_quote(self::$commentMultiRight);
 
       self::$commentMulti = $commentMultiLeft.'.*?'.$commentMultiRight;
       self::$whitePattern = '/'.$commentSingle.'[^\n]*\s*|('.self::$commentMulti.')\s*|\s+/Ais';
     }
   }
 
   public function parse($buffer) {
     $this->count = 0;
     $this->line = 1;
 
     $this->env = null; // block stack
     $this->buffer = $this->writeComments ? $buffer : $this->removeComments($buffer);
     $this->pushSpecialBlock("root");
     $this->eatWhiteDefault = true;
     $this->seenComments = array();
 
     // trim whitespace on head
     // if (preg_match('/^\s+/', $this->buffer, $m)) {
     //  $this->line += substr_count($m[0], "\n");
     //  $this->buffer = ltrim($this->buffer);
     // }
     $this->whitespace();
 
     // parse the entire file
     $lastCount = $this->count;
     while (false !== $this->parseChunk());
 
     if ($this->count != strlen($this->buffer))
       $this->throwError();
 
     // TODO report where the block was opened
     if (!is_null($this->env->parent))
       throw new exception('parse error: unclosed block');
 
     return $this->env;
   }
 
   /**
    * Parse a single chunk off the head of the buffer and append it to the
    * current parse environment.
    * Returns false when the buffer is empty, or when there is an error.
    *
    * This function is called repeatedly until the entire document is
    * parsed.
    *
    * This parser is most similar to a recursive descent parser. Single
    * functions represent discrete grammatical rules for the language, and
    * they are able to capture the text that represents those rules.
    *
    * Consider the function lessc::keyword(). (all parse functions are
    * structured the same)
    *
    * The function takes a single reference argument. When calling the
    * function it will attempt to match a keyword on the head of the buffer.
    * If it is successful, it will place the keyword in the referenced
    * argument, advance the position in the buffer, and return true. If it
    * fails then it won't advance the buffer and it will return false.
    *
    * All of these parse functions are powered by lessc::match(), which behaves
    * the same way, but takes a literal regular expression. Sometimes it is
    * more convenient to use match instead of creating a new function.
    *
    * Because of the format of the functions, to parse an entire string of
    * grammatical rules, you can chain them together using &&.
    *
    * But, if some of the rules in the chain succeed before one fails, then
    * the buffer position will be left at an invalid state. In order to
    * avoid this, lessc::seek() is used to remember and set buffer positions.
    *
    * Before parsing a chain, use $s = $this->seek() to remember the current
    * position into $s. Then if a chain fails, use $this->seek($s) to
    * go back where we started.
    */
   protected function parseChunk() {
     if (empty($this->buffer)) return false;
     $s = $this->seek();
 
     // setting a property
     if ($this->keyword($key) && $this->assign() &&
       $this->propertyValue($value, $key) && $this->end())
     {
       $this->append(array('assign', $key, $value), $s);
       return true;
     } else {
       $this->seek($s);
     }
 
 
     // look for special css blocks
     if ($this->literal('@', false)) {
       $this->count--;
 
       // media
       if ($this->literal('@media')) {
         if (($this->mediaQueryList($mediaQueries) || true)
           && $this->literal('{'))
         {
           $media = $this->pushSpecialBlock("media");
           $media->queries = is_null($mediaQueries) ? array() : $mediaQueries;
           return true;
         } else {
           $this->seek($s);
           return false;
         }
       }
 
       if ($this->literal("@", false) && $this->keyword($dirName)) {
         if ($this->isDirective($dirName, $this->blockDirectives)) {
           if (($this->openString("{", $dirValue, null, array(";")) || true) &&
             $this->literal("{"))
           {
             $dir = $this->pushSpecialBlock("directive");
             $dir->name = $dirName;
             if (isset($dirValue)) $dir->value = $dirValue;
             return true;
           }
         } elseif ($this->isDirective($dirName, $this->lineDirectives)) {
           if ($this->propertyValue($dirValue) && $this->end()) {
             $this->append(array("directive", $dirName, $dirValue));
             return true;
           }
         }
       }
 
       $this->seek($s);
     }
 
     // setting a variable
     if ($this->variable($var) && $this->assign() &&
       $this->propertyValue($value) && $this->end())
     {
       $this->append(array('assign', $var, $value), $s);
       return true;
     } else {
       $this->seek($s);
     }
 
     if ($this->import($importValue)) {
       $this->append($importValue, $s);
       return true;
     }
 
     // opening parametric mixin
     if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) &&
       ($this->guards($guards) || true) &&
       $this->literal('{'))
     {
       $block = $this->pushBlock($this->fixTags(array($tag)));
       $block->args = $args;
       $block->isVararg = $isVararg;
       if (!empty($guards)) $block->guards = $guards;
       return true;
     } else {
       $this->seek($s);
     }
 
     // opening a simple block
     if ($this->tags($tags) && $this->literal('{')) {
       $tags = $this->fixTags($tags);
       $this->pushBlock($tags);
       return true;
     } else {
       $this->seek($s);
     }
 
     // closing a block
     if ($this->literal('}', false)) {
       try {
         $block = $this->pop();
       } catch (exception $e) {
         $this->seek($s);
         $this->throwError($e->getMessage());
       }
 
       $hidden = false;
       if (is_null($block->type)) {
         $hidden = true;
         if (!isset($block->args)) {
           foreach ($block->tags as $tag) {
             if (!is_string($tag) || $tag{0} != $this->lessc->mPrefix) {
               $hidden = false;
               break;
             }
           }
         }
 
         foreach ($block->tags as $tag) {
           if (is_string($tag)) {
             $this->env->children[$tag][] = $block;
           }
         }
       }
 
       if (!$hidden) {
         $this->append(array('block', $block), $s);
       }
 
       // this is done here so comments aren't bundled into he block that
       // was just closed
       $this->whitespace();
       return true;
     }
 
     // mixin
     if ($this->mixinTags($tags) &&
       ($this->argumentDef($argv, $isVararg) || true) &&
       ($this->keyword($suffix) || true) && $this->end())
     {
       $tags = $this->fixTags($tags);
       $this->append(array('mixin', $tags, $argv, $suffix), $s);
       return true;
     } else {
       $this->seek($s);
     }
 
     // spare ;
     if ($this->literal(';')) return true;
 
     return false; // got nothing, throw error
   }
 
   protected function isDirective($dirname, $directives) {
     // TODO: cache pattern in parser
     $pattern = implode("|",
       array_map(array("lessc", "preg_quote"), $directives));
     $pattern = '/^(-[a-z-]+-)?(' . $pattern . ')$/i';
 
     return preg_match($pattern, $dirname);
   }
 
   protected function fixTags($tags) {
     // move @ tags out of variable namespace
     foreach ($tags as &$tag) {
       if ($tag{0} == $this->lessc->vPrefix)
         $tag[0] = $this->lessc->mPrefix;
     }
     return $tags;
   }
 
   // a list of expressions
   protected function expressionList(&$exps) {
     $values = array();
 
     while ($this->expression($exp)) {
       $values[] = $exp;
     }
 
     if (count($values) == 0) return false;
 
     $exps = lessc::compressList($values, ' ');
     return true;
   }
 
   /**
    * Attempt to consume an expression.
    * @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
    */
   protected function expression(&$out) {
     if ($this->value($lhs)) {
       $out = $this->expHelper($lhs, 0);
 
       // look for / shorthand
       if (!empty($this->env->supressedDivision)) {
         unset($this->env->supressedDivision);
         $s = $this->seek();
         if ($this->literal("/") && $this->value($rhs)) {
           $out = array("list", "",
             array($out, array("keyword", "/"), $rhs));
         } else {
           $this->seek($s);
         }
       }
 
       return true;
     }
     return false;
   }
 
   /**
    * recursively parse infix equation with $lhs at precedence $minP
    */
   protected function expHelper($lhs, $minP) {
     $this->inExp = true;
     $ss = $this->seek();
 
     while (true) {
       $whiteBefore = isset($this->buffer[$this->count - 1]) &&
         ctype_space($this->buffer[$this->count - 1]);
 
       // If there is whitespace before the operator, then we require
       // whitespace after the operator for it to be an expression
       $needWhite = $whiteBefore && !$this->inParens;
 
       if ($this->match(self::$operatorString.($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP) {
         if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/" && empty($this->env->supressedDivision)) {
           foreach (self::$supressDivisionProps as $pattern) {
             if (preg_match($pattern, $this->env->currentProperty)) {
               $this->env->supressedDivision = true;
               break 2;
             }
           }
         }
 
 
         $whiteAfter = isset($this->buffer[$this->count - 1]) &&
           ctype_space($this->buffer[$this->count - 1]);
 
         if (!$this->value($rhs)) break;
 
         // peek for next operator to see what to do with rhs
         if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {
           $rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
         }
 
         $lhs = array('expression', $m[1], $lhs, $rhs, $whiteBefore, $whiteAfter);
         $ss = $this->seek();
 
         continue;
       }
 
       break;
     }
 
     $this->seek($ss);
 
     return $lhs;
   }
 
   // consume a list of values for a property
   public function propertyValue(&$value, $keyName = null) {
     $values = array();
 
     if ($keyName !== null) $this->env->currentProperty = $keyName;
 
     $s = null;
     while ($this->expressionList($v)) {
       $values[] = $v;
       $s = $this->seek();
       if (!$this->literal(',')) break;
     }
 
     if ($s) $this->seek($s);
 
     if ($keyName !== null) unset($this->env->currentProperty);
 
     if (count($values) == 0) return false;
 
     $value = lessc::compressList($values, ', ');
     return true;
   }
 
   protected function parenValue(&$out) {
     $s = $this->seek();
 
     // speed shortcut
     if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(") {
       return false;
     }
 
     $inParens = $this->inParens;
     if ($this->literal("(") &&
       ($this->inParens = true) && $this->expression($exp) &&
       $this->literal(")"))
     {
       $out = $exp;
       $this->inParens = $inParens;
       return true;
     } else {
       $this->inParens = $inParens;
       $this->seek($s);
     }
 
     return false;
   }
 
   // a single value
   protected function value(&$value) {
     $s = $this->seek();
 
     // speed shortcut
     if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "-") {
       // negation
       if ($this->literal("-", false) &&
         (($this->variable($inner) && $inner = array("variable", $inner)) ||
         $this->unit($inner) ||
         $this->parenValue($inner)))
       {
         $value = array("unary", "-", $inner);
         return true;
       } else {
         $this->seek($s);
       }
     }
 
     if ($this->parenValue($value)) return true;
     if ($this->unit($value)) return true;
     if ($this->color($value)) return true;
     if ($this->func($value)) return true;
     if ($this->string($value)) return true;
 
     if ($this->keyword($word)) {
       $value = array('keyword', $word);
       return true;
     }
 
     // try a variable
     if ($this->variable($var)) {
       $value = array('variable', $var);
       return true;
     }
 
     // unquote string (should this work on any type?
     if ($this->literal("~") && $this->string($str)) {
       $value = array("escape", $str);
       return true;
     } else {
       $this->seek($s);
     }
 
     // css hack: \0
     if ($this->literal('\\') && $this->match('([0-9]+)', $m)) {
       $value = array('keyword', '\\'.$m[1]);
       return true;
     } else {
       $this->seek($s);
     }
 
     return false;
   }
 
   // an import statement
   protected function import(&$out) {
     $s = $this->seek();
     if (!$this->literal('@import')) return false;
 
     // @import "something.css" media;
     // @import url("something.css") media;
     // @import url(something.css) media;
 
     if ($this->propertyValue($value)) {
       $out = array("import", $value);
       return true;
     }
   }
 
   protected function mediaQueryList(&$out) {
     if ($this->genericList($list, "mediaQuery", ",", false)) {
       $out = $list[2];
       return true;
     }
     return false;
   }
 
   protected function mediaQuery(&$out) {
     $s = $this->seek();
 
     $expressions = null;
     $parts = array();
 
     if (($this->literal("only") && ($only = true) || $this->literal("not") && ($not = true) || true) && $this->keyword($mediaType)) {
       $prop = array("mediaType");
       if (isset($only)) $prop[] = "only";
       if (isset($not)) $prop[] = "not";
       $prop[] = $mediaType;
       $parts[] = $prop;
     } else {
       $this->seek($s);
     }
 
 
     if (!empty($mediaType) && !$this->literal("and")) {
       // ~
     } else {
       $this->genericList($expressions, "mediaExpression", "and", false);
       if (is_array($expressions)) $parts = array_merge($parts, $expressions[2]);
     }
 
     if (count($parts) == 0) {
       $this->seek($s);
       return false;
     }
 
     $out = $parts;
     return true;
   }
 
   protected function mediaExpression(&$out) {
     $s = $this->seek();
     $value = null;
     if ($this->literal("(") &&
       $this->keyword($feature) &&
       ($this->literal(":") && $this->expression($value) || true) &&
       $this->literal(")"))
     {
       $out = array("mediaExp", $feature);
       if ($value) $out[] = $value;
       return true;
     } elseif ($this->variable($variable)) {
       $out = array('variable', $variable);
       return true;
     }
 
     $this->seek($s);
     return false;
   }
 
   // an unbounded string stopped by $end
   protected function openString($end, &$out, $nestingOpen=null, $rejectStrs = null) {
     $oldWhite = $this->eatWhiteDefault;
     $this->eatWhiteDefault = false;
 
     $stop = array("'", '"', "@{", $end);
     $stop = array_map(array("lessc", "preg_quote"), $stop);
     // $stop[] = self::$commentMulti;
 
     if (!is_null($rejectStrs)) {
       $stop = array_merge($stop, $rejectStrs);
     }
 
     $patt = '(.*?)('.implode("|", $stop).')';
 
     $nestingLevel = 0;
 
     $content = array();
     while ($this->match($patt, $m, false)) {
       if (!empty($m[1])) {
         $content[] = $m[1];
         if ($nestingOpen) {
           $nestingLevel += substr_count($m[1], $nestingOpen);
         }
       }
 
       $tok = $m[2];
 
       $this->count-= strlen($tok);
       if ($tok == $end) {
         if ($nestingLevel == 0) {
           break;
         } else {
           $nestingLevel--;
         }
       }
 
       if (($tok == "'" || $tok == '"') && $this->string($str)) {
         $content[] = $str;
         continue;
       }
 
       if ($tok == "@{" && $this->interpolation($inter)) {
         $content[] = $inter;
         continue;
       }
 
       if (!empty($rejectStrs) && in_array($tok, $rejectStrs)) {
         break;
       }
 
       $content[] = $tok;
       $this->count+= strlen($tok);
     }
 
     $this->eatWhiteDefault = $oldWhite;
 
     if (count($content) == 0) return false;
 
     // trim the end
     if (is_string(end($content))) {
       $content[count($content) - 1] = rtrim(end($content));
     }
 
     $out = array("string", "", $content);
     return true;
   }
 
   protected function string(&$out) {
     $s = $this->seek();
     if ($this->literal('"', false)) {
       $delim = '"';
     } elseif ($this->literal("'", false)) {
       $delim = "'";
     } else {
       return false;
     }
 
     $content = array();
 
     // look for either ending delim , escape, or string interpolation
     $patt = '([^\n]*?)(@\{|\\\\|' .
       lessc::preg_quote($delim).')';
 
     $oldWhite = $this->eatWhiteDefault;
     $this->eatWhiteDefault = false;
 
     while ($this->match($patt, $m, false)) {
       $content[] = $m[1];
       if ($m[2] == "@{") {
         $this->count -= strlen($m[2]);
         if ($this->interpolation($inter, false)) {
           $content[] = $inter;
         } else {
           $this->count += strlen($m[2]);
           $content[] = "@{"; // ignore it
         }
       } elseif ($m[2] == '\\') {
         $content[] = $m[2];
         if ($this->literal($delim, false)) {
           $content[] = $delim;
         }
       } else {
         $this->count -= strlen($delim);
         break; // delim
       }
     }
 
     $this->eatWhiteDefault = $oldWhite;
 
     if ($this->literal($delim)) {
       $out = array("string", $delim, $content);
       return true;
     }
 
     $this->seek($s);
     return false;
   }
 
   protected function interpolation(&$out) {
     $oldWhite = $this->eatWhiteDefault;
     $this->eatWhiteDefault = true;
 
     $s = $this->seek();
     if ($this->literal("@{") &&
       $this->openString("}", $interp, null, array("'", '"', ";")) &&
       $this->literal("}", false))
     {
       $out = array("interpolate", $interp);
       $this->eatWhiteDefault = $oldWhite;
       if ($this->eatWhiteDefault) $this->whitespace();
       return true;
     }
 
     $this->eatWhiteDefault = $oldWhite;
     $this->seek($s);
     return false;
   }
 
   protected function unit(&$unit) {
     // speed shortcut
     if (isset($this->buffer[$this->count])) {
       $char = $this->buffer[$this->count];
       if (!ctype_digit($char) && $char != ".") return false;
     }
 
     if ($this->match('([0-9]+(?:\.[0-9]*)?|\.[0-9]+)([%a-zA-Z]+)?', $m)) {
       $unit = array("number", $m[1], empty($m[2]) ? "" : $m[2]);
       return true;
     }
     return false;
   }
 
   // a # color
   protected function color(&$out) {
     if ($this->match('(#(?:[0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{3}))', $m)) {
       if (strlen($m[1]) > 7) {
         $out = array("string", "", array($m[1]));
       } else {
         $out = array("raw_color", $m[1]);
       }
       return true;
     }
 
     return false;
   }
 
   // consume an argument definition list surrounded by ()
   // each argument is a variable name with optional value
   // or at the end a ... or a variable named followed by ...
   // arguments are separated by , unless a ; is in the list, then ; is the
   // delimiter.
   protected function argumentDef(&$args, &$isVararg) {
     $s = $this->seek();
     if (!$this->literal('(')) return false;
 
     $values = array();
     $delim = ",";
     $method = "expressionList";
 
     $isVararg = false;
     while (true) {
       if ($this->literal("...")) {
         $isVararg = true;
         break;
       }
 
       if ($this->$method($value)) {
         if ($value[0] == "variable") {
           $arg = array("arg", $value[1]);
           $ss = $this->seek();
 
           if ($this->assign() && $this->$method($rhs)) {
             $arg[] = $rhs;
           } else {
             $this->seek($ss);
             if ($this->literal("...")) {
               $arg[0] = "rest";
               $isVararg = true;
             }
           }
 
           $values[] = $arg;
           if ($isVararg) break;
           continue;
         } else {
           $values[] = array("lit", $value);
         }
       }
 
 
       if (!$this->literal($delim)) {
         if ($delim == "," && $this->literal(";")) {
           // found new delim, convert existing args
           $delim = ";";
           $method = "propertyValue";
 
           // transform arg list
           if (isset($values[1])) { // 2 items
             $newList = array();
             foreach ($values as $i => $arg) {
               switch($arg[0]) {
               case "arg":
                 if ($i) {
                   $this->throwError("Cannot mix ; and , as delimiter types");
                 }
                 $newList[] = $arg[2];
                 break;
               case "lit":
                 $newList[] = $arg[1];
                 break;
               case "rest":
                 $this->throwError("Unexpected rest before semicolon");
               }
             }
 
             $newList = array("list", ", ", $newList);
 
             switch ($values[0][0]) {
             case "arg":
               $newArg = array("arg", $values[0][1], $newList);
               break;
             case "lit":
               $newArg = array("lit", $newList);
               break;
             }
 
           } elseif ($values) { // 1 item
             $newArg = $values[0];
           }
 
           if ($newArg) {
             $values = array($newArg);
           }
         } else {
           break;
         }
       }
     }
 
     if (!$this->literal(')')) {
       $this->seek($s);
       return false;
     }
 
     $args = $values;
 
     return true;
   }
 
   // consume a list of tags
   // this accepts a hanging delimiter
   protected function tags(&$tags, $simple = false, $delim = ',') {
     $tags = array();
     while ($this->tag($tt, $simple)) {
       $tags[] = $tt;
       if (!$this->literal($delim)) break;
     }
     if (count($tags) == 0) return false;
 
     return true;
   }
 
   // list of tags of specifying mixin path
   // optionally separated by > (lazy, accepts extra >)
   protected function mixinTags(&$tags) {
     $s = $this->seek();
     $tags = array();
     while ($this->tag($tt, true)) {
       $tags[] = $tt;
       $this->literal(">");
     }
 
     if (count($tags) == 0) return false;
 
     return true;
   }
 
   // a bracketed value (contained within in a tag definition)
   protected function tagBracket(&$parts, &$hasExpression) {
     // speed shortcut
     if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "[") {
       return false;
     }
 
     $s = $this->seek();
 
     $hasInterpolation = false;
 
     if ($this->literal("[", false)) {
       $attrParts = array("[");
       // keyword, string, operator
       while (true) {
         if ($this->literal("]", false)) {
           $this->count--;
           break; // get out early
         }
 
         if ($this->match('\s+', $m)) {
           $attrParts[] = " ";
           continue;
         }
         if ($this->string($str)) {
           // escape parent selector, (yuck)
           foreach ($str[2] as &$chunk) {
             $chunk = str_replace($this->lessc->parentSelector, "$&$", $chunk);
           }
 
           $attrParts[] = $str;
           $hasInterpolation = true;
           continue;
         }
 
         if ($this->keyword($word)) {
           $attrParts[] = $word;
           continue;
         }
 
         if ($this->interpolation($inter, false)) {
           $attrParts[] = $inter;
           $hasInterpolation = true;
           continue;
         }
 
         // operator, handles attr namespace too
         if ($this->match('[|-~\$\*\^=]+', $m)) {
           $attrParts[] = $m[0];
           continue;
         }
 
         break;
       }
 
       if ($this->literal("]", false)) {
         $attrParts[] = "]";
         foreach ($attrParts as $part) {
           $parts[] = $part;
         }
         $hasExpression = $hasExpression || $hasInterpolation;
         return true;
       }
       $this->seek($s);
     }
 
     $this->seek($s);
     return false;
   }
 
   // a space separated list of selectors
   protected function tag(&$tag, $simple = false) {
     if ($simple)
       $chars = '^@,:;{}\][>\(\) "\'';
     else
       $chars = '^@,;{}["\'';
 
     $s = $this->seek();
 
     $hasExpression = false;
     $parts = array();
     while ($this->tagBracket($parts, $hasExpression));
 
     $oldWhite = $this->eatWhiteDefault;
     $this->eatWhiteDefault = false;
 
     while (true) {
       if ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
         $parts[] = $m[1];
         if ($simple) break;
 
         while ($this->tagBracket($parts, $hasExpression));
         continue;
       }
 
       if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "@") {
         if ($this->interpolation($interp)) {
           $hasExpression = true;
           $interp[2] = true; // don't unescape
           $parts[] = $interp;
           continue;
         }
 
         if ($this->literal("@")) {
           $parts[] = "@";
           continue;
         }
       }
 
       if ($this->unit($unit)) { // for keyframes
         $parts[] = $unit[1];
         $parts[] = $unit[2];
         continue;
       }
 
       break;
     }
 
     $this->eatWhiteDefault = $oldWhite;
     if (!$parts) {
       $this->seek($s);
       return false;
     }
 
     if ($hasExpression) {
       $tag = array("exp", array("string", "", $parts));
     } else {
       $tag = trim(implode($parts));
     }
 
     $this->whitespace();
     return true;
   }
 
   // a css function
   protected function func(&$func) {
     $s = $this->seek();
 
     if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
       $fname = $m[1];
 
       $sPreArgs = $this->seek();
 
       $args = array();
       while (true) {
         $ss = $this->seek();
         // this ugly nonsense is for ie filter properties
         if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
           $args[] = array("string", "", array($name, "=", $value));
         } else {
           $this->seek($ss);
           if ($this->expressionList($value)) {
             $args[] = $value;
           }
         }
 
         if (!$this->literal(',')) break;
       }
       $args = array('list', ',', $args);
 
       if ($this->literal(')')) {
         $func = array('function', $fname, $args);
         return true;
       } elseif ($fname == 'url') {
         // couldn't parse and in url? treat as string
         $this->seek($sPreArgs);
         if ($this->openString(")", $string) && $this->literal(")")) {
           $func = array('function', $fname, $string);
           return true;
         }
       }
     }
 
     $this->seek($s);
     return false;
   }
 
   // consume a less variable
   protected function variable(&$name) {
     $s = $this->seek();
     if ($this->literal($this->lessc->vPrefix, false) &&
       ($this->variable($sub) || $this->keyword($name)))
     {
       if (!empty($sub)) {
         $name = array('variable', $sub);
       } else {
         $name = $this->lessc->vPrefix.$name;
       }
       return true;
     }
 
     $name = null;
     $this->seek($s);
     return false;
   }
 
   /**
    * Consume an assignment operator
    * Can optionally take a name that will be set to the current property name
    */
   protected function assign($name = null) {
     if ($name) $this->currentProperty = $name;
     return $this->literal(':') || $this->literal('=');
   }
 
   // consume a keyword
   protected function keyword(&$word) {
     if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m)) {
       $word = $m[1];
       return true;
     }
     return false;
   }
 
   // consume an end of statement delimiter
   protected function end() {
     if ($this->literal(';')) {
       return true;
     } elseif ($this->count == strlen($this->buffer) || $this->buffer[$this->count] == '}') {
       // if there is end of file or a closing block next then we don't need a ;
       return true;
     }
     return false;
   }
 
   protected function guards(&$guards) {
     $s = $this->seek();
 
     if (!$this->literal("when")) {
       $this->seek($s);
       return false;
     }
 
     $guards = array();
 
     while ($this->guardGroup($g)) {
       $guards[] = $g;
       if (!$this->literal(",")) break;
     }
 
     if (count($guards) == 0) {
       $guards = null;
       $this->seek($s);
       return false;
     }
 
     return true;
   }
 
   // a bunch of guards that are and'd together
   // TODO rename to guardGroup
   protected function guardGroup(&$guardGroup) {
     $s = $this->seek();
     $guardGroup = array();
     while ($this->guard($guard)) {
       $guardGroup[] = $guard;
       if (!$this->literal("and")) break;
     }
 
     if (count($guardGroup) == 0) {
       $guardGroup = null;
       $this->seek($s);
       return false;
     }
 
     return true;
   }
 
   protected function guard(&$guard) {
     $s = $this->seek();
     $negate = $this->literal("not");
 
     if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
       $guard = $exp;
       if ($negate) $guard = array("negate", $guard);
       return true;
     }
 
     $this->seek($s);
     return false;
   }
 
   /* raw parsing functions */
 
   protected function literal($what, $eatWhitespace = null) {
     if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
 
     // shortcut on single letter
     if (!isset($what[1]) && isset($this->buffer[$this->count])) {
       if ($this->buffer[$this->count] == $what) {
         if (!$eatWhitespace) {
           $this->count++;
           return true;
         }
         // goes below...
       } else {
         return false;
       }
     }
 
     if (!isset(self::$literalCache[$what])) {
       self::$literalCache[$what] = lessc::preg_quote($what);
     }
 
     return $this->match(self::$literalCache[$what], $m, $eatWhitespace);
   }
 
   protected function genericList(&$out, $parseItem, $delim="", $flatten=true) {
     $s = $this->seek();
     $items = array();
     while ($this->$parseItem($value)) {
       $items[] = $value;
       if ($delim) {
         if (!$this->literal($delim)) break;
       }
     }
 
     if (count($items) == 0) {
       $this->seek($s);
       return false;
     }
 
     if ($flatten && count($items) == 1) {
       $out = $items[0];
     } else {
       $out = array("list", $delim, $items);
     }
 
     return true;
   }
 
 
   // advance counter to next occurrence of $what
   // $until - don't include $what in advance
   // $allowNewline, if string, will be used as valid char set
   protected function to($what, &$out, $until = false, $allowNewline = false) {
     if (is_string($allowNewline)) {
       $validChars = $allowNewline;
     } else {
       $validChars = $allowNewline ? "." : "[^\n]";
     }
     if (!$this->match('('.$validChars.'*?)'.lessc::preg_quote($what), $m, !$until)) return false;
     if ($until) $this->count -= strlen($what); // give back $what
     $out = $m[1];
     return true;
   }
 
   // try to match something on head of buffer
   protected function match($regex, &$out, $eatWhitespace = null) {
     if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
 
     $r = '/'.$regex.($eatWhitespace && !$this->writeComments ? '\s*' : '').'/Ais';
     if (preg_match($r, $this->buffer, $out, null, $this->count)) {
       $this->count += strlen($out[0]);
       if ($eatWhitespace && $this->writeComments) $this->whitespace();
       return true;
     }
     return false;
   }
 
   // match some whitespace
   protected function whitespace() {
     if ($this->writeComments) {
       $gotWhite = false;
       while (preg_match(self::$whitePattern, $this->buffer, $m, null, $this->count)) {
         if (isset($m[1]) && empty($this->commentsSeen[$this->count])) {
           $this->append(array("comment", $m[1]));
           $this->commentsSeen[$this->count] = true;
         }
         $this->count += strlen($m[0]);
         $gotWhite = true;
       }
       return $gotWhite;
     } else {
       $this->match("", $m);
       return strlen($m[0]) > 0;
     }
   }
 
   // match something without consuming it
   protected function peek($regex, &$out = null, $from=null) {
     if (is_null($from)) $from = $this->count;
     $r = '/'.$regex.'/Ais';
     $result = preg_match($r, $this->buffer, $out, null, $from);
 
     return $result;
   }
 
   // seek to a spot in the buffer or return where we are on no argument
   protected function seek($where = null) {
     if ($where === null) return $this->count;
     else $this->count = $where;
     return true;
   }
 
   /* misc functions */
 
   public function throwError($msg = "parse error", $count = null) {
     $count = is_null($count) ? $this->count : $count;
 
     $line = $this->line +
       substr_count(substr($this->buffer, 0, $count), "\n");
 
     if (!empty($this->sourceName)) {
       $loc = "$this->sourceName on line $line";
     } else {
       $loc = "line: $line";
     }
 
     // TODO this depends on $this->count
     if ($this->peek("(.*?)(\n|$)", $m, $count)) {
       throw new exception("$msg: failed at `$m[1]` $loc");
     } else {
       throw new exception("$msg: $loc");
     }
   }
 
   protected function pushBlock($selectors=null, $type=null) {
     $b = new stdclass;
     $b->parent = $this->env;
 
     $b->type = $type;
     $b->id = self::$nextBlockId++;
 
     $b->isVararg = false; // TODO: kill me from here
     $b->tags = $selectors;
 
     $b->props = array();
     $b->children = array();
 
     $this->env = $b;
     return $b;
   }
 
   // push a block that doesn't multiply tags
   protected function pushSpecialBlock($type) {
     return $this->pushBlock(null, $type);
   }
 
   // append a property to the current block
   protected function append($prop, $pos = null) {
     if ($pos !== null) $prop[-1] = $pos;
     $this->env->props[] = $prop;
   }
 
   // pop something off the stack
   protected function pop() {
     $old = $this->env;
     $this->env = $this->env->parent;
     return $old;
   }
 
   // remove comments from $text
   // todo: make it work for all functions, not just url
   protected function removeComments($text) {
     $look = array(
       'url(', '//', '/*', '"', "'"
     );
 
     $out = '';
     $min = null;
     while (true) {
       // find the next item
       foreach ($look as $token) {
         $pos = strpos($text, $token);
         if ($pos !== false) {
           if (!isset($min) || $pos < $min[1]) $min = array($token, $pos);
         }
       }
 
       if (is_null($min)) break;
 
       $count = $min[1];
       $skip = 0;
       $newlines = 0;
       switch ($min[0]) {
       case 'url(':
         if (preg_match('/url\(.*?\)/', $text, $m, 0, $count))
           $count += strlen($m[0]) - strlen($min[0]);
         break;
       case '"':
       case "'":
         if (preg_match('/'.$min[0].'.*?(?<!\\\\)'.$min[0].'/', $text, $m, 0, $count))
           $count += strlen($m[0]) - 1;
         break;
       case '//':
         $skip = strpos($text, "\n", $count);
         if ($skip === false) $skip = strlen($text) - $count;
         else $skip -= $count;
         break;
       case '/*':
         if (preg_match('/\/\*.*?\*\//s', $text, $m, 0, $count)) {
           $skip = strlen($m[0]);
           $newlines = substr_count($m[0], "\n");
         }
         break;
       }
 
       if ($skip == 0) $count += strlen($min[0]);
 
       $out .= substr($text, 0, $count).str_repeat("\n", $newlines);
       $text = substr($text, $count + $skip);
 
       $min = null;
     }
 
     return $out.$text;
   }
 
 }
 
 class lessc_formatter_classic {
   public $indentChar = "  ";
 
   public $break = "\n";
   public $open = " {";
   public $close = "}";
   public $selectorSeparator = ", ";
   public $assignSeparator = ":";
 
   public $openSingle = " { ";
   public $closeSingle = " }";
 
   public $disableSingle = false;
   public $breakSelectors = false;
 
   public $compressColors = false;
 
   public function __construct() {
     $this->indentLevel = 0;
   }
 
   public function indentStr($n = 0) {
     return str_repeat($this->indentChar, max($this->indentLevel + $n, 0));
   }
 
   public function property($name, $value) {
     return $name . $this->assignSeparator . $value . ";";
   }
 
   protected function isEmpty($block) {
     if (empty($block->lines)) {
       foreach ($block->children as $child) {
         if (!$this->isEmpty($child)) return false;
       }
 
       return true;
     }
     return false;
   }
 
   public function block($block) {
     if ($this->isEmpty($block)) return;
 
     $inner = $pre = $this->indentStr();
 
     $isSingle = !$this->disableSingle &&
       is_null($block->type) && count($block->lines) == 1;
 
     if (!empty($block->selectors)) {
       $this->indentLevel++;
 
       if ($this->breakSelectors) {
         $selectorSeparator = $this->selectorSeparator . $this->break . $pre;
       } else {
         $selectorSeparator = $this->selectorSeparator;
       }
 
       echo $pre .
         implode($selectorSeparator, $block->selectors);
       if ($isSingle) {
         echo $this->openSingle;
         $inner = "";
       } else {
         echo $this->open . $this->break;
         $inner = $this->indentStr();
       }
 
     }
 
     if (!empty($block->lines)) {
       $glue = $this->break.$inner;
       echo $inner . implode($glue, $block->lines);
       if (!$isSingle && !empty($block->children)) {
         echo $this->break;
       }
     }
 
     foreach ($block->children as $child) {
       $this->block($child);
     }
 
     if (!empty($block->selectors)) {
       if (!$isSingle && empty($block->children)) echo $this->break;
 
       if ($isSingle) {
         echo $this->closeSingle . $this->break;
       } else {
         echo $pre . $this->close . $this->break;
       }
 
       $this->indentLevel--;
     }
   }
 }
 
 class lessc_formatter_compressed extends lessc_formatter_classic {
   public $disableSingle = true;
   public $open = "{";
   public $selectorSeparator = ",";
   public $assignSeparator = ":";
   public $break = "";
   public $compressColors = true;
 
   public function indentStr($n = 0) {
     return "";
   }
 }
 
 class lessc_formatter_lessjs extends lessc_formatter_classic {
   public $disableSingle = true;
   public $breakSelectors = true;
   public $assignSeparator = ": ";
   public $selectorSeparator = ",";
 }