Merge commit '551497ef94f6239b109316d8fab32f0909b13f73' as 'mod/less'

1 files changed, 2910 insertions, 0 deletions

diff --git a/mod/less/vendors/lessphp/lessc.inc.php b/mod/less/vendors/lessphp/lessc.inc.php
new file mode 100644
index 000000000..d710fdf8a
--- /dev/null
+++ b/mod/less/vendors/lessphp/lessc.inc.php
@@ -0,0 +1,2910 @@
+<?php
+
+/**
+ * lessphp v0.3.5
+ * 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 two stage process. The incoming file is parsed
+ * by `lessc_parser` into a tree, then compiled to CSS text by `lessc`. The
+ * compile step has an implicit step called reduction, where values are brought
+ * to their lowest form before being turned to text, eg. mathematical equations
+ * are solved, and variables are dereferenced.
+ *
+ * The `lessc` class creates an intstance of the parser, feeds it LESS code, then
+ * compiles the resulting tree to CSS
+ *
+ * The `lessc_parser` class is only concerned with parsing its input.
+ *
+ * The `lessc_formatter` classes are used to format the output of the CSS,
+ * controlling things like whitespace and line-breaks.
+ */
+class lessc {
+	static public $VERSION = "v0.3.5";
+	static protected $TRUE = array("keyword", "true");
+	static protected $FALSE = array("keyword", "false");
+
+	protected $libFunctions = array();
+
+	protected $indentLevel;
+
+	protected $env = null;
+
+	protected $allParsedFiles = array();
+
+	public $vPrefix = '@'; // prefix of abstract properties
+	public $mPrefix = '$'; // prefix of abstract blocks
+	public $parentSelector = '&';
+
+	// types that must be reduced before being compiled
+	static protected $dtypes = array('expression', 'variable',
+		'function', 'negative', 'list', 'lookup');
+
+	public $importDisabled = false;
+	public $importDir = '';
+
+	public $compat = true; // lessjs compatibility mode, does nothing right now
+
+	// set to the parser that generated the current line when compiling
+	// so we know how to create error messages
+	protected $sourceParser = null;
+	protected $sourceLoc = null;
+
+	// attempts to find the path of an import url, returns null for css files
+	function findImport($url) {
+		foreach ((array)$this->importDir as $dir) {
+			$full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
+			if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
+				return $file;
+			}
+		}
+
+		return null;
+	}
+
+	function fileExists($name) {
+		return is_file($name);
+	}
+
+	static function compressList($items, $delim) {
+		if (count($items) == 1) return $items[0];
+		else return array('list', $delim, $items);
+	}
+
+	static function preg_quote($what) {
+		return preg_quote($what, '/');
+	}
+
+	// just do a shallow property merge, seems to be what lessjs does
+	function mergeBlock($target, $from) {
+		$target = clone $target;
+		$target->props = array_merge($target->props, $from->props);
+		return $target;
+	}
+
+	// attempt to import $import into $parentBlock
+	// $props is the property array that will given to $parentBlock at the end
+	function mixImport($import, $parentBlock, &$props) {
+		list(, $url, $media) = $import;
+
+		if (empty($media) && substr_compare($url, '.css', -4, 4) !== 0) {
+			if ($this->importDisabled) {
+				$props[] = array('raw', '/* import disabled */');
+				return true;
+			}
+
+			$realPath = $this->findImport($url);
+			if (!is_null($realPath)) {
+				$this->addParsedFile($realPath);
+
+				$parser = new lessc_parser($this, $realPath);
+				$root = $parser->parse(file_get_contents($realPath));
+				$root->isRoot = false;
+				$root->parent = $parentBlock;
+
+				// handle all the imports in the new file
+				$pi = pathinfo($realPath);
+				$this->mixImports($root, $pi['dirname'].'/');
+
+				// inject imported blocks into this block, local will overwrite import
+				$parentBlock->children =
+					array_merge($root->children,$parentBlock->children);
+
+				// splice in the props
+				foreach ($root->props as $prop) {
+					// leave a reference to the file where it came from
+					if (isset($prop[-1]) && !is_array($prop[-1])) {
+						$prop[-1] = array($parser, $prop[-1]);
+					}
+					$props[] = $prop;
+				}
+
+				return true;
+			}
+		}
+
+		// fallback to regular css import
+		$props[] = array('raw', '@import url("'.$url.'")'.($media ? ' '.$media : '').';');
+		return false;
+	}
+
+	// import all imports mentioned in the block
+	function mixImports($block, $importDir = null) {
+		$oldImport = $this->importDir;
+		if (!is_null($importDir)) {
+			$this->importDir = array_merge((array)$importDir, (array)$this->importDir);
+		}
+
+		$props = array();
+		foreach ($block->props as $prop) {
+			if ($prop[0] == 'import') {
+				$this->mixImport($prop, $block, $props);
+			} else {
+				$props[] = $prop;
+			}
+		}
+		$block->props = $props;
+		$this->importDir = $oldImport;
+	}
+
+	/**
+	 * Recursively compiles a block.
+	 * @param $block the block
+	 * @param $parentTags the tags of the block that contained this one
+	 *
+	 * A block is analogous to a CSS block in most cases. A single less document
+	 * is encapsulated in a block when parsed, but it does not have parent tags
+	 * so all of it's children appear on the root level when compiled.
+	 *
+	 * Blocks are made up of props and children.
+	 *
+	 * Props are property instructions, array tuples which describe an action
+	 * to be taken, eg. write a property, set a variable, mixin a block.
+	 *
+	 * The children of a block are just all the blocks that are defined within.
+	 *
+	 * Compiling the block involves pushing a fresh environment on the stack,
+	 * and iterating through the props, compiling each one.
+	 *
+	 * See lessc::compileProp()
+	 *
+	 */
+	function compileBlock($block, $parent_tags = null) {
+		if (!empty($block->no_multiply)) {
+			$special_block = true;
+			$tags = array();
+		} else {
+			$special_block = false;
+
+			// evaluate expression tags
+			$tags = null;
+			if (is_array($block->tags)) {
+				$tags = array();
+				foreach ($block->tags as $tag) {
+					if (is_array($tag)) {
+						list(, $value) = $tag;
+						$tags[] = $this->compileValue($this->reduce($value));
+					} else {
+						$tags[] = $tag;
+					}
+				}
+			}
+
+			$tags = $this->multiplyTags($parent_tags, $tags);
+		}
+
+		$env = $this->pushEnv();
+		$env->nameDepth = array();
+
+		$lines = array();
+		$blocks = array();
+		$this->mixImports($block);
+
+		$idelta = $this->formatter->indentAmount($block);
+		$this->indentLevel += $idelta;
+
+		foreach ($this->sortProps($block->props) as $prop) {
+			$this->compileProp($prop, $block, $tags, $lines, $blocks);
+		}
+		$this->indentLevel -= $idelta;
+
+		$block->scope = $env;
+
+		$this->pop();
+
+		// override tags if it's a special block
+		if (isset($block->media)) {
+			$tags = $this->compileMedia($block);
+		} elseif (isset($block->keyframes)) {
+			$tags = $block->tags[0]." ".
+				$this->compileValue($this->reduce($block->keyframes));
+		} elseif ($special_block) { // font-face and the like
+			$tags = $block->tags[0];
+		}
+
+		return $this->formatter->block($tags, $special_block, $lines,
+			$blocks, $this->indentLevel);
+	}
+
+	function sortProps($props) {
+		$out = array();
+		foreach ($props as $prop) {
+			if ($prop[0] == "assign") $out[] = $prop;
+		}
+
+		foreach ($props as $prop) {
+			if ($prop[0] != "assign") $out[] = $prop;
+		}
+
+		return $out;
+	}
+
+	function expandParentSelectors(&$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 $count;
+	}
+
+	// find the fully qualified tags for a block and its parent's tags
+	function multiplyTags($parents, $current) {
+		if ($parents == null) {
+			if (is_array($current)) {
+				// get rid of parent selectors and escapes in top level tag
+				foreach ($current as &$tag) {
+					$this->expandParentSelectors($tag, "");
+				}
+			}
+			return $current;
+		}
+
+		$tags = array();
+		foreach ($parents as $ptag) {
+			foreach ($current as $tag) {
+				$count = $this->expandParentSelectors($tag, $ptag);
+
+				// don't prepend the parent tag if & was used
+				if ($count > 0) {
+					$tags[] = trim($tag);
+				} else {
+					$tags[] = trim($ptag . ' ' . $tag);
+				}
+			}
+		}
+
+		return $tags;
+	}
+
+	function eq($left, $right) {
+		return $left == $right;
+	}
+
+	function patternMatch($block, $callingArgs) {
+		// match the guards if it has them
+		// any one of the groups must have all its guards pass for a match
+		if (!empty($block->guards)) {
+			$group_passed = false;
+			foreach ($block->guards as $guard_group) {
+				foreach ($guard_group as $guard) {
+					$this->pushEnv();
+					$this->zipSetArgs($block->args, $callingArgs);
+
+					$negate = false;
+					if ($guard[0] == "negate") {
+						$guard = $guard[1];
+						$negate = true;
+					}
+
+					$passed = $this->reduce($guard) == self::$TRUE;
+					if ($negate) $passed = !$passed;
+
+					$this->pop();
+
+					if ($passed) {
+						$group_passed = true;
+					} else {
+						$group_passed = false;
+						break;
+					}
+				}
+
+				if ($group_passed) break;
+			}
+
+			if (!$group_passed) {
+				return false;
+			}
+		}
+
+		$numCalling = count($callingArgs);
+
+		if (empty($block->args)) {
+			return $block->is_vararg || $numCalling == 0;
+		}
+
+		$i = -1; // no args
+		// try to match by arity or by argument literal
+		foreach ($block->args as $i => $arg) {
+			switch ($arg[0]) {
+			case "lit":
+				if (empty($callingArgs[$i]) || !$this->eq($arg[1], $callingArgs[$i])) {
+					return false;
+				}
+				break;
+			case "arg":
+				// no arg and no default value
+				if (!isset($callingArgs[$i]) && !isset($arg[2])) {
+					return false;
+				}
+				break;
+			case "rest":
+				$i--; // rest can be empty
+				break 2;
+			}
+		}
+
+		if ($block->is_vararg) {
+			return true; // not having enough is handled above
+		} else {
+			$numMatched = $i + 1;
+			// greater than becuase default values always match
+			return $numMatched >= $numCalling;
+		}
+	}
+
+	function patternMatchAll($blocks, $callingArgs) {
+		$matches = null;
+		foreach ($blocks as $block) {
+			if ($this->patternMatch($block, $callingArgs)) {
+				$matches[] = $block;
+			}
+		}
+
+		return $matches;
+	}
+
+	// attempt to find blocks matched by path and args
+	function findBlocks($search_in, $path, $args, $seen=array()) {
+		if ($search_in == null) return null;
+		if (isset($seen[$search_in->id])) return null;
+		$seen[$search_in->id] = true;
+
+		$name = $path[0];
+
+		if (isset($search_in->children[$name])) {
+			$blocks = $search_in->children[$name];
+			if (count($path) == 1) {
+				$matches = $this->patternMatchAll($blocks, $args);
+				if (!empty($matches)) {
+					// This will return all blocks that match in the closest
+					// scope that has any matching block, like lessjs
+					return $matches;
+				}
+			} else {
+				return $this->findBlocks($blocks[0],
+					array_slice($path, 1), $args, $seen);
+			}
+		}
+
+		if ($search_in->parent === $search_in) return null;
+		return $this->findBlocks($search_in->parent, $path, $args, $seen);
+	}
+
+	// sets all argument names in $args to either the default value
+	// or the one passed in through $values
+	function zipSetArgs($args, $values) {
+		$i = 0;
+		$assigned_values = array();
+		foreach ($args as $a) {
+			if ($a[0] == "arg") {
+				if ($i < count($values) && !is_null($values[$i])) {
+					$value = $values[$i];
+				} elseif (isset($a[2])) {
+					$value = $a[2];
+				} else $value = null;
+
+				$value = $this->reduce($value);
+				$this->set($a[1], $value);
+				$assigned_values[] = $value;
+			}
+			$i++;
+		}
+
+		// check for a rest
+		$last = end($args);
+		if ($last[0] == "rest") {
+			$rest = array_slice($values, count($args) - 1);
+			$this->set($last[1], $this->reduce(array("list", " ", $rest)));
+		}
+
+		$this->env->arguments = $assigned_values;
+	}
+
+	// compile a prop and update $lines or $blocks appropriately
+	function compileProp($prop, $block, $tags, &$_lines, &$_blocks) {
+		// set error position context
+		if (isset($prop[-1])) {
+			if (is_array($prop[-1])) {
+				list($parser, $count) = $prop[-1];
+				$this->sourceParser = $parser;
+				$this->sourceLoc = $count;
+			} else {
+				$this->sourceParser = $this->parser;
+				$this->sourceLoc = $prop[-1];
+			}
+		} else {
+			$this->sourceLoc = -1;
+		}
+
+		switch ($prop[0]) {
+		case 'assign':
+			list(, $name, $value) = $prop;
+			if ($name[0] == $this->vPrefix) {
+				$this->set($name, $value);
+			} else {
+				$_lines[] = "$name:".
+					$this->compileValue($this->reduce($value)).";";
+			}
+			break;
+		case 'block':
+			list(, $child) = $prop;
+			$_blocks[] = $this->compileBlock($child, $tags);
+			break;
+		case 'mixin':
+			list(, $path, $args, $suffix) = $prop;
+
+			$args = array_map(array($this, "reduce"), (array)$args);
+			$mixins = $this->findBlocks($block, $path, $args);
+			if (is_null($mixins)) {
+				// echo "failed to find block: ".implode(" > ", $path)."\n";
+				break; // throw error here??
+			}
+
+			foreach ($mixins as $mixin) {
+				$old_scope = null;
+				if (isset($mixin->parent->scope)) {
+					$old_scope = $this->env;
+					$this->env = $mixin->parent->scope;
+				}
+
+				$have_args = false;
+				if (isset($mixin->args)) {
+					$have_args = true;
+					$this->pushEnv();
+					$this->zipSetArgs($mixin->args, $args);
+				}
+
+				$old_parent = $mixin->parent;
+				if ($mixin != $block) $mixin->parent = $block;
+
+				foreach ($this->sortProps($mixin->props) as $sub_prop) {
+					if($suffix !== null) {
+						$sub_prop[2] = array(
+							'list', ' ',
+							array($sub_prop[2], array('keyword', $suffix))
+						);
+					}
+
+					$this->compileProp($sub_prop, $mixin, $tags, $_lines, $_blocks);
+				}
+
+				$mixin->parent = $old_parent;
+
+				if ($have_args) $this->pop();
+
+				if ($old_scope) {
+					$this->env = $old_scope;
+				}
+			}
+
+			break;
+		case 'raw':
+			$_lines[] = $prop[1];
+			break;
+		case 'charset':
+			list(, $value) = $prop;
+			$_lines[] = '@charset '.$this->compileValue($this->reduce($value)).';';
+			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.
+	 */
+	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 'keyword':
+			// [1] - the keyword
+		case 'number':
+			// [1] - the number
+			return $value[1];
+		case 'escape':
+		case 'string':
+			// [1] - contents of string (includes quotes)
+
+			// search for inline variables to replace
+			$replace = array();
+			if (preg_match_all('/'.self::preg_quote($this->vPrefix).'\{([\w-_][0-9\w-_]*)\}/', $value[1], $m)) {
+				foreach ($m[1] as $name) {
+					if (!isset($replace[$name]))
+						$replace[$name] = $this->compileValue($this->reduce(array('variable', $this->vPrefix . $name)));
+				}
+			}
+
+			foreach ($replace as $var=>$val) {
+				if ($this->quoted($val)) {
+					$val = substr($val, 1, -1);
+				}
+				$value[1] = str_replace($this->vPrefix. '{'.$var.'}', $val, $value[1]);
+			}
+
+			return $value[1];
+		case 'color':
+			// [1] - red component (either number for 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, $b);
+
+			// Converting hex color to short notation (e.g. #003399 to #039) 
+			if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
+				$h = '#' . $h[1] . $h[3] . $h[5];
+			}
+
+			return $h;
+
+		case 'function':
+			// [1] - function name
+			// [2] - some array value representing arguments, either ['string', value] or ['list', ',', values[]]
+
+			// see if function evaluates to something else
+			$value = $this->reduce($value);
+			if ($value[0] == 'function') {
+				return $value[1].'('.$this->compileValue($value[2]).')';
+			}
+			else return $this->compileValue($value);
+		default: // assumed to be unit
+			return $value[1].$value[0];
+		}
+	}
+
+	function compileMedia($block) {
+		$mediaParts = array();
+		foreach ($block->media as $part) {
+			if ($part[0] == "raw") {
+				$mediaParts[] = $part[1];
+			} elseif ($part[0] == "assign") {
+				list(, $propName, $propVal) = $part;
+				$mediaParts[] = "$propName: ".
+					$this->compileValue($this->reduce($propVal));
+			}
+		}
+
+		return "@media ".trim(implode($mediaParts));
+	}
+
+	function lib_isnumber($value) {
+		return $this->toBool(is_numeric($value[1]) && $value[0] != "color");
+	}
+
+	function lib_isstring($value) {
+		return $this->toBool($value[0] == "string");
+	}
+
+	function lib_iscolor($value) {
+		return $this->toBool($this->coerceColor($value));
+	}
+
+	function lib_iskeyword($value) {
+		return $this->toBool($value[0] == "keyword");
+	}
+
+	function lib_ispixel($value) {
+		return $this->toBool($value[0] == "px");
+	}
+
+	function lib_ispercentage($value) {
+		return $this->toBool($value[0] == "%");
+	}
+
+	function lib_isem($value) {
+		return $this->toBool($value[0] == "em");
+	}
+
+	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 : 0,
+			$color[1],$color[2], $color[3]);
+	}
+
+	function lib_argb($color){
+            return $this->lib_rgbahex($color);
+        }
+
+	// utility func to unquote a string
+	function lib_e($arg) {
+		switch ($arg[0]) {
+			case "list":
+				$items = $arg[2];
+				if (isset($items[0])) {
+					return $this->lib_e($items[0]);
+				}
+				return "";
+			case "string":
+				$str = $this->compileValue($arg);
+				return substr($str, 1, -1);
+			default:
+				return $this->compileValue($arg);
+		}
+	}
+
+	function lib__sprintf($args) {
+		if ($args[0] != "list") return $args;
+		$values = $args[2];
+		$source = $this->reduce(array_shift($values));
+		if ($source[0] != "string") {
+			return $source;
+		}
+
+		$str = $source[1];
+		$i = 0;
+		if (preg_match_all('/%[dsa]/', $str, $m)) {
+			foreach ($m[0] as $match) {
+				$val = isset($values[$i]) ? $this->reduce($values[$i]) : array('keyword', '');
+				$i++;
+				switch ($match[1]) {
+				case "s":
+					if ($val[0] == "string") {
+						$rep = substr($val[1], 1, -1);
+						break;
+					}
+				default:
+					$rep = $this->compileValue($val);
+				}
+				$str = preg_replace('/'.self::preg_quote($match).'/', $rep, $str, 1);
+			}
+		}
+
+		return array('string', $str);
+	}
+
+	function lib_floor($arg) {
+		return array($arg[0], floor($arg[1]));
+	}
+
+	function lib_ceil($arg) {
+		return array($arg[0], ceil($arg[1]));
+	}
+
+	function lib_round($arg) {
+		return array($arg[0], round($arg[1]));
+	}
+
+	// is a string surrounded in quotes? returns the quoting char if true
+	function quoted($s) {
+		if (preg_match('/^("|\').*?\1$/', $s, $m))
+			return $m[1];
+		else return false;
+	}
+
+	/**
+	 * Helper function to get arguments for color functions.
+	 * Accepts invalid input, non colors interpreted as being black.
+	 */
+	function colorArgs($args) {
+		if ($args[0] != 'list' || count($args[2]) < 2) {
+			return array(array('color', 0, 0, 0));
+		}
+		list($color, $delta) = $args[2];
+		$color = $this->coerceColor($color);
+		if (is_null($color))
+			$color = array('color', 0, 0, 0);
+
+		$delta = floatval($delta[1]);
+
+		return array($color, $delta);
+	}
+
+	function lib_darken($args) {
+		list($color, $delta) = $this->colorArgs($args);
+
+		$hsl = $this->toHSL($color);
+		$hsl[3] = $this->clamp($hsl[3] - $delta, 100);
+		return $this->toRGB($hsl);
+	}
+
+	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);
+	}
+
+	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);
+	}
+
+	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);
+	}
+
+	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);
+	}
+
+	function lib_fadeout($args) {
+		list($color, $delta) = $this->colorArgs($args);
+		$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
+		return $color;
+	}
+
+	function lib_fadein($args) {
+		list($color, $delta) = $this->colorArgs($args);
+		$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
+		return $color;
+	}
+
+	function lib_hue($color) {
+		if ($color[0] != 'color') return 0;
+		$hsl = $this->toHSL($color);
+		return round($hsl[1]);
+	}
+
+	function lib_saturation($color) {
+		if ($color[0] != 'color') return 0;
+		$hsl = $this->toHSL($color);
+		return round($hsl[2]);
+	}
+
+	function lib_lightness($color) {
+		if ($color[0] != 'color') return 0;
+		$hsl = $this->toHSL($color);
+		return round($hsl[3]);
+	}
+
+	// get the alpha of a color
+	// defaults to 1 for non-colors or colors without an alpha
+	function lib_alpha($color) {
+		if ($color[0] != 'color') return 1;
+		return isset($color[4]) ? $color[4] : 1;
+	}
+
+	// set the alpha of the color
+	function lib_fade($args) {
+		list($color, $alpha) = $this->colorArgs($args);
+		$color[4] = $this->clamp($alpha / 100.0);
+		return $color;
+	}
+
+	function lib_percentage($number) {
+		return array('%', $number[1]*100);
+	}
+
+	// mixes two colors by weight
+	// mix(@color1, @color2, @weight);
+	// http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
+	function lib_mix($args) {
+		if ($args[0] != "list" || count($args[2]) < 3)
+			$this->throwError("mix expects (color1, color2, weight)");
+
+		list($first, $second, $weight) = $args[2];
+		$first = $this->assertColor($first);
+		$second = $this->assertColor($second);
+
+		$first_a = $this->lib_alpha($first);
+		$second_a = $this->lib_alpha($second);
+		$weight = $weight[1] / 100.0;
+
+		$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);
+	}
+
+	function assertColor($value, $error = "expected color value") {
+		$color = $this->coerceColor($value);
+		if (is_null($color)) $this->throwError($error);
+		return $color;
+	}
+
+	function toHSL($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 $out;
+	}
+
+	function toRGB_helper($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 $temp1;
+	}
+
+	/**
+	 * Converts a hsl array into a color value in rgb.
+	 * Expects H to be in range of 0 to 360, S and L in 0 to 100
+	 */
+	function toRGB($color) {
+		if ($color == '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 $out;
+	}
+
+	function clamp($v, $max = 1, $min = 0) {
+		return min($max, max($min, $v));
+	}
+
+	/**
+	 * Convert the rgb, rgba, hsl color literals of function type
+	 * as returned by the parser into values of color type.
+	 */
+	function funcToColor($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 < 4) $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] == '%') $components[] = 255 * ($c[1] / 100);
+					else $components[] = floatval($c[1]);
+				} elseif ($i == 4) {
+					if ($c[0] == '%') $components[] = 1.0 * ($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;
+	}
+
+	function toName($val) {
+		switch($val[0]) {
+		case "string":
+			return substr($val[1], 1, -1);
+		default:
+			return $val[1];
+		}
+	}
+
+	// reduce a delayed type to its final value
+	// dereference variables and solve equations
+	function reduce($var) {
+		// this is done here for infinite loop checking
+		if ($var[0] == "variable") {
+			$key = is_array($var[1]) ?
+				$this->vPrefix.$this->toName($this->reduce($var[1])) : $var[1];
+
+			$seen =& $this->env->seenNames;
+
+			if (!empty($seen[$key])) {
+				$this->throwError("infinite loop detected: $key");
+			}
+
+			$seen[$key] = true;
+
+			$out = $this->reduce($this->get($key));
+
+			$seen[$key] = false;
+
+			return $out;
+		}
+
+		while (in_array($var[0], self::$dtypes)) {
+			if ($var[0] == 'list') {
+				foreach ($var[2] as &$value) $value = $this->reduce($value);
+				break;
+			} elseif ($var[0] == 'expression') {
+				$var = $this->evaluate($var[1], $var[2], $var[3]);
+			} elseif ($var[0] == 'lookup') {
+				// do accessor here....
+				$var = array('number', 0);
+			} elseif ($var[0] == 'function') {
+				$color = $this->funcToColor($var);
+				if ($color) $var = $color;
+				else {
+					list($_, $name, $args) = $var;
+					if ($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]);
+
+						$var = call_user_func($f, $this->reduce($args), $this);
+
+						// convert to a typed value if the result is a php primitive
+						if (is_numeric($var)) $var = array('number', $var);
+						elseif (!is_array($var)) $var = array('keyword', $var);
+					} else {
+						// plain function, reduce args
+						$var[2] = $this->reduce($var[2]);
+					}
+				}
+				break; // done reducing after a function
+			} elseif ($var[0] == 'negative') {
+				$value = $this->reduce($var[1]);
+				if (is_numeric($value[1])) {
+					$value[1] = -1*$value[1];
+				}
+				$var = $value;
+			}
+		}
+
+		return $var;
+	}
+
+	function coerceColor($value) {
+		switch($value[0]) {
+			case 'color': return $value;
+			case 'keyword':
+				$name = $value[1];
+				if (isset(self::$cssColors[$name])) {
+					list($r, $g, $b) = explode(',', self::$cssColors[$name]);
+					return array('color', $r, $g, $b);
+				}
+				return null;
+		}
+	}
+
+	function toBool($a) {
+		if ($a) return self::$TRUE;
+		else return self::$FALSE;
+	}
+
+	// evaluate an expression
+	function evaluate($op, $left, $right) {
+		$left = $this->reduce($left);
+		$right = $this->reduce($right);
+
+		if ($left_color = $this->coerceColor($left)) {
+			$left = $left_color;
+		}
+
+		if ($right_color = $this->coerceColor($right)) {
+			$right = $right_color;
+		}
+
+		if ($op == "and") {
+			return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
+		}
+
+		if ($op == "=") {
+			return $this->toBool($this->eq($left, $right) );
+		}
+
+		if ($left[0] == 'color' && $right[0] == 'color') {
+			$out = $this->op_color_color($op, $left, $right);
+			return $out;
+		}
+
+		if ($left[0] == 'color') {
+			return $this->op_color_number($op, $left, $right);
+		}
+
+		if ($right[0] == 'color') {
+			return $this->op_number_color($op, $left, $right);
+		}
+
+		// concatenate strings
+		if ($op == '+' && $left[0] == 'string') {
+			$append = $this->compileValue($right);
+			if ($this->quoted($append)) $append = substr($append, 1, -1);
+
+			$lhs = $this->compileValue($left);
+			if ($q = $this->quoted($lhs)) $lhs = substr($lhs, 1, -1);
+			if (!$q) $q = '';
+
+			return array('string', $q.$lhs.$append.$q);
+		}
+
+		if ($left[0] == 'keyword' || $right[0] == 'keyword' ||
+			$left[0] == 'string' || $right[0] == 'string')
+		{
+			// look for negative op
+			if ($op == '-') $right[1] = '-'.$right[1];
+			return array('keyword', $this->compileValue($left) .' '. $this->compileValue($right));
+		}
+
+		// default to number operation
+		return $this->op_number_number($op, $left, $right);
+	}
+
+	// make sure a color's components don't go out of bounds
+	function fixColor($c) {
+		foreach (range(1, 3) as $i) {
+			if ($c[$i] < 0) $c[$i] = 0;
+			if ($c[$i] > 255) $c[$i] = 255;
+		}
+
+		return $c;
+	}
+
+	function op_number_color($op, $lft, $rgt) {
+		if ($op == '+' || $op = '*') {
+			return $this->op_color_number($op, $rgt, $lft);
+		}
+	}
+
+	function op_color_number($op, $lft, $rgt) {
+		if ($rgt[0] == '%') $rgt[1] /= 100;
+
+		return $this->op_color_color($op, $lft,
+			array_fill(1, count($lft) - 1, $rgt[1]));
+	}
+
+	function op_color_color($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);
+	}
+
+	// operator on two numbers
+	function op_number_number($op, $left, $right) {
+		$type = is_null($left) ? "number" : $left[0];
+		if ($type == "number") $type = $right[0];
+
+		$value = 0;
+		switch ($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($type, $value);
+	}
+
+
+	/* environment functions */
+
+	// used for compiliation variable state
+	function pushEnv() {
+		$e = new stdclass;
+		$e->parent = $this->env;
+
+		$this->store = array();
+
+		$this->env = $e;
+		return $e;
+	}
+
+	// pop something off the stack
+	function pop() {
+		$old = $this->env;
+		$this->env = $this->env->parent;
+		return $old;
+	}
+
+	// set something in the current env
+	function set($name, $value) {
+		$this->env->store[$name] = $value;
+	}
+
+
+	// get the highest occurrence entry for a name
+	function get($name) {
+		$current = $this->env;
+
+		$is_arguments = $name == $this->vPrefix . 'arguments';
+		while ($current) {
+			if ($is_arguments && isset($current->arguments)) {
+				return array('list', ' ', $current->arguments);
+			}
+
+			if (isset($current->store[$name]))
+				return $current->store[$name];
+			else
+				$current = $current->parent;
+		}
+
+		return null;
+	}
+
+	// create a child parser (for compiling an import)
+	protected function createChild($fname) {
+		$less = new lessc($fname);
+		$less->importDir = array_merge((array)$less->importDir, (array)$this->importDir);
+		$less->formatter = $this->formatter;
+		$less->compat = $this->compat;
+		return $less;
+	}
+
+	// inject array of unparsed strings into environment as variables
+	protected function injectVariables($args) {
+		$this->pushEnv();
+		$parser = new lessc_parser($this, __METHOD__);
+		foreach ($args as $name => $str_value) {
+			if ($name{0} != '@') $name = '@'.$name;
+			$parser->count = 0;
+			$parser->buffer = (string)$str_value;
+			if (!$parser->propertyValue($value)) {
+				throw new Exception("failed to parse passed in variable $name: $str_value");
+			}
+
+			$this->set($name, $value);
+		}
+	}
+
+	// parse and compile buffer
+	function parse($str = null, $initialVariables = null) {
+		if (is_array($str)) {
+			$initialVariables = $str;
+			$str = null;
+		}
+
+		$locale = setlocale(LC_NUMERIC, 0);
+		setlocale(LC_NUMERIC, "C");
+
+		$name = null;
+		if (is_null($str)) {
+			if (empty($this->fileName))
+				throw new exception("nothing to parse");
+
+			$name = $this->fileName;
+			$str = file_get_contents($this->fileName);
+		}
+
+		$this->parser = new lessc_parser($this, $name);
+		$root = $this->parser->parse($str);
+
+		$this->formatter = $this->newFormatter();
+
+		if ($initialVariables) $this->injectVariables($initialVariables);
+		$this->indentLevel = -1;
+		$out = $this->compileBlock($root);
+		setlocale(LC_NUMERIC, $locale);
+		return $out;
+	}
+
+	function setFormatter($name) {
+		$this->formatterName = $name;
+	}
+
+	function newFormatter() {
+		$className = "lessc_formatter";
+		if (!empty($this->formatterName)) {
+			if (!is_string($this->formatterName))
+				return $this->formatterName;
+			$className = "lessc_formatter_$this->formatterName";
+		}
+
+		return new $className;
+	}
+
+	/**
+	 * Uses the current value of $this->count to show line and line number
+	 */
+	function throwError($msg = null) {
+		if ($this->sourceLoc >= 0) {
+			$this->sourceParser->throwError($msg, $this->sourceLoc);
+		}
+		throw new exception($msg);
+	}
+
+	/**
+	 * Initialize any static state, can initialize parser for a file
+	 * $opts isn't used yet
+	 */
+	function __construct($fname = null, $opts = null) {
+		if ($fname) {
+			if (!is_file($fname)) {
+				throw new Exception('load error: failed to find '.$fname);
+			}
+			$pi = pathinfo($fname);
+
+			$this->fileName = $fname;
+			$this->importDir = $pi['dirname'].'/';
+			$this->addParsedFile($fname);
+		}
+	}
+
+	public function registerFunction($name, $func) {
+		$this->libFunctions[$name] = $func;
+	}
+
+	public function unregisterFunction($name) {
+		unset($this->libFunctions[$name]);
+	}
+
+	public function allParsedFiles() { return $this->allParsedFiles; }
+	protected function addParsedFile($file) {
+		$this->allParsedFiles[realpath($file)] = filemtime($file);
+	}
+
+
+	// compile file $in to file $out if $in is newer than $out
+	// returns true when it compiles, false otherwise
+	public static function ccompile($in, $out) {
+		if (!is_file($out) || filemtime($in) > filemtime($out)) {
+			$less = new lessc($in);
+			file_put_contents($out, $less->parse());
+			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 $force Force rebuild?
+	 * @return array lessphp cache structure
+	 */
+	public static function cexecute($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.
+			$less = new lessc($root);
+			$out = array();
+			$out['root'] = $root;
+			$out['compiled'] = $less->parse();
+			$out['files'] = $less->allParsedFiles();
+			$out['updated'] = time();
+			return $out;
+		} else {
+			// No changes, pass back the structure
+			// we were given initially.
+			return $in;
+		}
+
+	}
+
+	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',
+		'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,
+	);
+
+	// 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');
+
+	/**
+	 * @link http://www.w3.org/TR/css3-values/
+	 */
+	static protected $units = array(
+		'em', 'ex', 'px', 'gd', 'rem', 'vw', 'vh', 'vm', 'ch', // Relative length units
+		'in', 'cm', 'mm', 'pt', 'pc', // Absolute length units
+		'%', // Percentages
+		'deg', 'grad', 'rad', 'turn', // Angles
+		'ms', 's', // Times
+		'Hz', 'kHz', //Frequencies
+	);
+
+	/**
+	 * 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 $inParens = false;
+
+	function __construct($lessc, $sourceName = null) {
+		// reference to less needed for vPrefix, mPrefix, and parentSelector
+		$this->lessc = $lessc;
+
+		$this->sourceName = $sourceName; // name used for error messages
+
+		if (!self::$operatorString) {
+			self::$operatorString =
+				'('.implode('|', array_map(array('lessc', 'preg_quote'),
+					array_keys(self::$precedence))).')';
+		}
+	}
+
+	function parse($buffer) {
+		$this->count = 0;
+		$this->line = 1;
+
+		$this->env = null; // block stack
+		$this->buffer = $this->removeComments($buffer);
+		$this->pushBlock(null); // root
+
+		// trim whitespace on head
+		if (preg_match('/^\s+/', $this->buffer, $m)) {
+			$this->line += substr_count($m[0], "\n");
+			$this->buffer = ltrim($this->buffer);
+		}
+
+		// 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');
+
+		$this->env->isRoot = true;
+		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->env->parent == null && $this->literal('@', false)) {
+			$this->count--;
+
+			// a font-face block
+			if ($this->literal('@font-face') && $this->literal('{')) {
+				$b = $this->pushSpecialBlock('@font-face');
+				return true;
+			} else {
+				$this->seek($s);
+			}
+
+			// charset
+			if ($this->literal('@charset') && $this->propertyValue($value) &&
+				$this->end())
+			{
+				$this->append(array('charset', $value), $s);
+				return true;
+			} else {
+				$this->seek($s);
+			}
+
+
+			// media
+			if ($this->literal('@media') && $this->mediaTypes($types) &&
+				$this->literal('{'))
+			{
+				$b = $this->pushSpecialBlock('@media');
+				$b->media = $types;
+				return true;
+			} else {
+				$this->seek($s);
+			}
+
+			// css animations
+			if ($this->match('(@(-[a-z]+-)?keyframes)', $m) &&
+				$this->propertyValue($value) && $this->literal('{'))
+			{
+				$b = $this->pushSpecialBlock(trim($m[0]));
+				$b->keyframes = $value;
+				return true;
+			} else {
+				$this->seek($s);
+			}
+
+			if ($this->literal("@page") &&
+				($this->match('(:(left|right))', $m) || true) &&
+				$this->literal("{"))
+			{
+				$name = "@page";
+				if ($m) $name = $name . " " . $m[1];
+				$this->pushSpecialBlock($name);
+				return true;
+			} else {
+				$this->seek($s);
+			}
+		}
+
+		if (isset($this->env->keyframes)) {
+			if ($this->keyframeTags($ktags) && $this->literal('{')) {
+				$this->pushSpecialBlock($ktags);
+				return true;
+			} else {
+				$this->seek($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 ($this->import($url, $media)) {
+			$this->append(array('import', $url, $media), $s);
+			return true;
+
+			// don't check .css files
+			if (empty($media) && substr_compare($url, '.css', -4, 4) !== 0) {
+				if ($this->importDisabled) {
+					$this->append(array('raw', '/* import disabled */'));
+				} else {
+					$path = $this->findImport($url);
+					if (!is_null($path)) {
+						$this->append(array('import', $path), $s);
+						return true;
+					}
+				}
+			}
+
+			$this->append(array('raw', '@import url("'.$url.'")'.
+				($media ? ' '.$media : '').';'), $s);
+			return true;
+		}
+
+		// opening parametric mixin
+		if ($this->tag($tag, true) && $this->argumentDef($args, $is_vararg) &&
+			($this->guards($guards) || true) &&
+			$this->literal('{'))
+		{
+			$block = $this->pushBlock($this->fixTags(array($tag)));
+			$block->args = $args;
+			$block->is_vararg = $is_vararg;
+			if (!empty($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('}')) {
+			try {
+				$block = $this->pop();
+			} catch (exception $e) {
+				$this->seek($s);
+				$this->throwError($e->getMessage());
+			}
+
+			$hidden = true;
+			if (!isset($block->args)) foreach ($block->tags as $tag) {
+				if (!is_string($tag) || $tag{0} != $this->lessc->mPrefix) {
+					$hidden = false;
+					break;
+				}
+			}
+
+			if (!$hidden) $this->append(array('block', $block), $s);
+
+			foreach ($block->tags as $tag) {
+				if (is_string($tag)) {
+					$this->env->children[$tag][] = $block;
+				}
+			}
+
+			return true;
+		}
+
+		// mixin
+		if ($this->mixinTags($tags) &&
+			($this->argumentValues($argv) || true) &&
+			($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 ($this->literal(';')) return true;
+
+		return false; // got nothing, throw error
+	}
+
+	protected function fixTags($tags) {
+		// move @ tags out of variable namespace
+		foreach ($tags as &$tag) {
+			if ($tag{0} == $this->lessc->vPrefix)
+				$tag[0] = $this->lessc->mPrefix;
+		}
+		return $tags;
+	}
+
+	protected function keyframeTags(&$tags) {
+		$s = $this->seek();
+		$tags = array();
+		while($this->match("(to|from|[0-9]+%)", $m)) {
+			$tags[] = $m[1];
+			if (!$this->literal(",")) break;
+		}
+
+		if (count($tags) == 0) {
+			$this->seek($s);
+			return false;
+		}
+
+		return true;
+	}
+
+	// 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) {
+		$s = $this->seek();
+		if ($this->literal('(') && ($this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
+			$lhs = $exp;
+		} elseif ($this->seek($s) && $this->value($val)) {
+			$lhs = $val;
+		} else {
+			$this->inParens = false;
+			$this->seek($s);
+			return false;
+		}
+
+		$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);
+			}
+		}
+
+		$this->inParens = false;
+		return true;
+	}
+
+	/**
+	 * recursively parse infix equation with $lhs at precedence $minP
+	 */
+	protected function expHelper($lhs, $minP) {
+		$this->inExp = true;
+		$ss = $this->seek();
+
+		// if there was whitespace before the operator, then we require whitespace after
+		// the operator for it to be a mathematical operator.
+
+		$needWhite = false;
+		if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
+			$needWhite = true;
+		}
+
+		// try to find a valid operator
+		while ($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;
+					}
+				}
+			}
+
+			// get rhs
+			$s = $this->seek();
+			$p = $this->inParens;
+			if ($this->literal('(') && ($this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
+				$this->inParens = $p;
+				$rhs = $exp;
+			} else {
+				$this->inParens = $p;
+				if ($this->seek($s) && $this->value($val)) {
+					$rhs = $val;
+				} else {
+					break;
+				}
+			}
+
+			// peek for next operator to see what to do with rhs
+			if ($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);
+			$ss = $this->seek();
+
+			$needWhite = false;
+			if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
+				$needWhite = true;
+			}
+		}
+		$this->seek($ss);
+
+		return $lhs;
+	}
+
+	// consume a list of values for a property
+	public function propertyValue(&$value, $keyName=null) {
+		$values = array();
+
+		if (!is_null($keyName)) $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 (!is_null($keyName)) unset($this->env->currentProperty);
+
+		if (count($values) == 0) return false;
+
+		$value = lessc::compressList($values, ', ');
+		return true;
+	}
+
+	// a single value
+	protected function value(&$value) {
+		// try a unit
+		if ($this->unit($value)) return true;
+
+		// see if there is a negation
+		$s = $this->seek();
+		if ($this->literal('-', false)) {
+			$value = null;
+			if ($this->variable($var)) {
+				$value = array('variable', $var);
+			} elseif ($this->buffer{$this->count} == "(" && $this->expression($exp)) {
+				$value = $exp;
+			} else {
+				$this->seek($s);
+			}
+
+			if (!is_null($value)) {
+				$value = array('negative', $value);
+				return true;
+			}
+		} else {
+			$this->seek($s);
+		}
+
+		// accessor
+		// must be done before color
+		// this needs negation too
+		if ($this->accessor($a)) {
+			$a[1] = $this->fixTags($a[1]);
+			$value = $a;
+			return true;
+		}
+
+		// color
+		if ($this->color($value)) return true;
+
+		// css function
+		// must be done after color
+		if ($this->func($value)) return true;
+
+		// string
+		if ($this->string($tmp, $d)) {
+			$value = array('string', $d.$tmp.$d);
+			return true;
+		}
+
+		// try a keyword
+		if ($this->keyword($word)) {
+			$value = array('keyword', $word);
+			return true;
+		}
+
+		// try a variable
+		if ($this->variable($var)) {
+			$value = array('variable', $var);
+			return true;
+		}
+
+		// unquote string
+		if ($this->literal("~") && $this->string($value, $d)) {
+			$value = array("escape", $value);
+			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(&$url, &$media) {
+		$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->literal('url(')) $parens = true; else $parens = false;
+
+		if (!$this->string($url)) {
+			if ($parens && $this->to(')', $url)) {
+				$parens = false; // got em
+			} else {
+				$this->seek($s);
+				return false;
+			}
+		}
+
+		if ($parens && !$this->literal(')')) {
+			$this->seek($s);
+			return false;
+		}
+
+		// now the rest is media
+		return $this->to(';', $media, false, true);
+	}
+
+	// a list of media types, very lenient
+	protected function mediaTypes(&$parts) {
+		$parts = array();
+		while ($this->to("(", $chunk, false, "[^{]")) {
+			$parts[] = array('raw', $chunk."(");
+			$s = $this->seek();
+			if ($this->keyword($name) && $this->assign() &&
+				$this->propertyValue($value))
+			{
+				$parts[] = array('assign', $name, $value);
+			} else {
+				$this->seek($s);
+			}
+		}
+
+		if ($this->to('{', $rest, true, true)) {
+			$parts[] = array('raw', $rest);
+			return true;
+		}
+
+		$parts = null;
+		return false;
+	}
+
+	// a scoped value accessor
+	// .hello > @scope1 > @scope2['value'];
+	protected function accessor(&$var) {
+		$s = $this->seek();
+
+		if (!$this->tags($scope, true, '>') || !$this->literal('[')) {
+			$this->seek($s);
+			return false;
+		}
+
+		// either it is a variable or a property
+		// why is a property wrapped in quotes, who knows!
+		if ($this->variable($name)) {
+			// ~
+		} elseif ($this->literal("'") && $this->keyword($name) && $this->literal("'")) {
+			// .. $this->count is messed up if we wanted to test another access type
+		} else {
+			$this->seek($s);
+			return false;
+		}
+
+		if (!$this->literal(']')) {
+			$this->seek($s);
+			return false;
+		}
+
+		$var = array('lookup', $scope, $name);
+		return true;
+	}
+
+	// a string
+	protected function string(&$string, &$d = null) {
+		$s = $this->seek();
+		if ($this->literal('"', false)) {
+			$delim = '"';
+		} elseif ($this->literal("'", false)) {
+			$delim = "'";
+		} else {
+			return false;
+		}
+
+		if (!$this->to($delim, $string)) {
+			$this->seek($s);
+			return false;
+		}
+
+		$d = $delim;
+		return true;
+	}
+
+	/**
+	 * Consume a number and optionally a unit.
+	 * Can also consume a font shorthand if it is a simple case.
+	 * $allowed restricts the types that are matched.
+	 */
+	protected function unit(&$unit, $allowed = null) {
+		if (!$allowed) $allowed = self::$units;
+
+		if ($this->match('(-?[0-9]*(\.)?[0-9]+)('.implode('|', $allowed).')?', $m)) {
+			if (!isset($m[3])) $m[3] = 'number';
+			$unit = array($m[3], $m[1]);
+
+			return true;
+		}
+
+		return false;
+	}
+
+	// a # color
+	protected function color(&$out) {
+		$color = array('color');
+
+		if ($this->match('(#([0-9a-f]{6})|#([0-9a-f]{3}))', $m)) {
+			if (isset($m[3])) {
+				$num = $m[3];
+				$width = 16;
+			} else {
+				$num = $m[2];
+				$width = 256;
+			}
+
+			$num = hexdec($num);
+			foreach (array(3,2,1) as $i) {
+				$t = $num % $width;
+				$num /= $width;
+
+				$color[$i] = $t * (256/$width) + $t * floor(16/$width);
+			}
+
+			$out = $color;
+			return true;
+		}
+
+		return false;
+	}
+
+	// consume a list of property values delimited by ; and wrapped in ()
+	protected function argumentValues(&$args, $delim = ',') {
+		$s = $this->seek();
+		if (!$this->literal('(')) return false;
+
+		$values = array();
+		while (true) {
+			if ($this->expressionList($value)) $values[] = $value;
+			if (!$this->literal($delim)) break;
+			else {
+				if ($value == null) $values[] = null;
+				$value = null;
+			}
+		}
+
+		if (!$this->literal(')')) {
+			$this->seek($s);
+			return false;
+		}
+
+		$args = $values;
+		return true;
+	}
+
+	// consume an argument definition list surrounded by ()
+	// each argument is a variable name with optional value
+	// or at the end a ... or a variable named followed by ...
+	protected function argumentDef(&$args, &$is_vararg, $delim = ',') {
+		$s = $this->seek();
+		if (!$this->literal('(')) return false;
+
+		$values = array();
+
+		$is_vararg = false;
+		while (true) {
+			if ($this->literal("...")) {
+				$is_vararg = true;
+				break;
+			}
+
+			if ($this->variable($vname)) {
+				$arg = array("arg", $vname);
+				$ss = $this->seek();
+				if ($this->assign() && $this->expressionList($value)) {
+					$arg[] = $value;
+				} else {
+					$this->seek($ss);
+					if ($this->literal("...")) {
+						$arg[0] = "rest";
+						$is_vararg = true;
+					}
+				}
+				$values[] = $arg;
+				if ($is_vararg) break;
+				continue;
+			}
+
+			if ($this->value($literal)) {
+				$values[] = array("lit", $literal);
+			}
+
+			if (!$this->literal($delim)) break;
+		}
+
+		if (!$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 >)
+	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(&$value) {
+		$s = $this->seek();
+		if ($this->literal('[') && $this->to(']', $c, true) && $this->literal(']', false)) {
+			$value = '['.$c.']';
+			// whitespace?
+			if ($this->match('', $_)) $value .= $_[0];
+
+			// escape parent selector, (yuck)
+			$value = str_replace($this->lessc->parentSelector, "$&$", $value);
+			return true;
+		}
+
+		$this->seek($s);
+		return false;
+	}
+
+	protected function tagExpression(&$value) {
+		$s = $this->seek();
+		if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
+			$value = array('exp', $exp);
+			return true;
+		}
+
+		$this->seek($s);
+		return false;
+	}
+
+	// a single tag
+	protected function tag(&$tag, $simple = false) {
+		if ($simple)
+			$chars = '^,:;{}\][>\(\) "\'';
+		else
+			$chars = '^,;{}["\'';
+
+		if (!$simple && $this->tagExpression($tag)) {
+			return true;
+		}
+
+		$tag = '';
+		while ($this->tagBracket($first)) $tag .= $first;
+		while ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
+			$tag .= $m[1];
+			if ($simple) break;
+
+			while ($this->tagBracket($brack)) $tag .= $brack;
+		}
+		$tag = trim($tag);
+		if ($tag == '') return false;
+
+		return true;
+	}
+
+	// a css function
+	protected function func(&$func) {
+		$s = $this->seek();
+
+		if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
+			$fname = $m[1];
+
+			$s_pre_args = $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('list', '=', array(array('keyword', $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
+				$this->seek($s_pre_args);
+				if ($this->to(')', $content, true) && $this->literal(')')) {
+					$func = array('function', $fname,array('string', $content));
+					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->guard_group($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 guard_group(&$guard_group) {
+		$s = $this->seek();
+		$guard_group = array();
+		while ($this->guard($guard)) {
+			$guard_group[] = $guard;
+			if (!$this->literal("and")) break;
+		}
+
+		if (count($guard_group) == 0) {
+			$guard_group = 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, $eatWhitespace = true) {
+		// this is here mainly prevent notice from { } string accessor
+		if ($this->count >= strlen($this->buffer)) return false;
+
+		// shortcut on single letter
+		if (!$eatWhitespace && strlen($what) == 1) {
+			if ($this->buffer{$this->count} == $what) {
+				$this->count++;
+				return true;
+			}
+			else return false;
+		}
+
+		return $this->match(lessc::preg_quote($what), $m, $eatWhitespace);
+	}
+
+
+	// 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 = true) {
+		$r = '/'.$regex.($eatWhitespace ? '\s*' : '').'/Ais';
+		if (preg_match($r, $this->buffer, $out, null, $this->count)) {
+			$this->count += strlen($out[0]);
+			return true;
+		}
+		return false;
+	}
+
+	// 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: $loc");
+		}
+	}
+
+	protected function pushBlock($tags) {
+		$b = new stdclass;
+		$b->parent = $this->env;
+
+		$b->id = self::$nextBlockId++;
+		$b->is_vararg = false;
+		$b->tags = $tags;
+		$b->props = array();
+		$b->children = array();
+
+		$this->env = $b;
+		return $b;
+	}
+
+	// push a block that doesn't multiply tags
+	protected function pushSpecialBlock($name) {
+		$b = $this->pushBlock(array($name));
+		$b->no_multiply = true;
+		return $b;
+	}
+
+	// append a property to the current block
+	function append($prop, $pos = null) {
+		if (!is_null($pos)) $prop[-1] = $pos;
+		$this->env->props[] = $prop;
+	}
+
+	// pop something off the stack
+	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;
+		$done = false;
+		while (true) {
+			// find the next item
+			foreach ($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 {
+	public $indentChar = "  ";
+
+	public $break = "\n";
+	public $open = " {";
+	public $close = "}";
+	public $tagSeparator = ", ";
+
+	public $disableSingle = false;
+	public $openSingle = " { ";
+	public $closeSingle = " }";
+
+	// returns the amount of indent that should happen for a block
+	function indentAmount($block) {
+		return isset($block->isRoot) || !empty($block->no_multiply) ? 1 : 0;
+	}
+
+	// an $indentLevel of -1 signifies the root level
+	function block($tags, $wrapChildren, $lines, $children, $indentLevel) {
+		$indent = str_repeat($this->indentChar, max($indentLevel, 0));
+
+		// what $lines is imploded by
+		$nl = $indentLevel == -1 ? $this->break :
+			$this->break.$indent.$this->indentChar;
+
+		ob_start();
+
+		$isSingle = !$this->disableSingle && !$wrapChildren
+			&& count($lines) <= 1;
+
+		$showDelim = !empty($tags) && (count($lines) > 0 || $wrapChildren);
+
+		if ($showDelim) {
+			if (is_array($tags)) {
+				$tags = implode($this->tagSeparator, $tags);
+			}
+
+			echo $indent.$tags;
+			if ($isSingle) echo $this->openSingle;
+			else {
+				echo $this->open;
+				if (!empty($lines)) echo $nl;
+				else echo $this->break;
+			}
+		}
+
+		echo implode($nl, $lines);
+
+		if ($wrapChildren) {
+			if (!empty($lines)) echo $this->break;
+			foreach ($children as $child) echo $child;
+		}
+
+		if ($showDelim) {
+			if ($isSingle) echo $this->closeSingle;
+			else {
+				if (!$wrapChildren) echo $this->break;
+				echo $indent.$this->close;
+			}
+			echo $this->break;
+		} elseif (!empty($lines)) {
+			echo $this->break;
+		}
+
+		if (!$wrapChildren)
+			foreach ($children as $child) echo $child;
+
+		return ob_get_clean();
+	}
+
+	function property($name, $values) {
+		return "";
+	}
+}
+
+class lessc_formatter_compressed extends lessc_formatter {
+	public $indentChar = "";
+
+	public $break = "";
+	public $open = "{";
+	public $close = "}";
+	public $tagSeparator = ",";
+	public $disableSingle = true;
+}
+
+class lessc_formatter_indent extends lessc_formatter {
+	function indentAmount($block) {
+		if (isset($block->isRoot)) return 1;
+		$numLines = 0;
+		foreach ($block->props as $prop) {
+			$t = $prop[0];
+			if ($t != 'block' && $t != 'mixin') {
+				$numLines++;
+			}
+		}
+		return $numLines > 0 ? 1 : 0;
+	}
+}
+