Detached Rulesets support

lessc.inc.php

@@ -690,6 +690,7 @@ protected function compileProp($prop, $block, $out) {
 			list(, $child) = $prop;
 			$this->compileBlock($child);
 			break;
+		case 'ruleset':
 		case 'mixin':
 			list(, $path, $args, $suffix) = $prop;
 
@@ -720,6 +721,11 @@ protected function compileProp($prop, $block, $out) {
 				$this->throwError("{$prop[1][0]} is undefined");
 			}
 
+			if(strpos($prop[1][0], "$") === 0) {
+				//Use Ruleset Logic - Only last element
+				$mixins = array(array_pop($mixins));
+			}
+
 			foreach ($mixins as $mixin) {
 				if ($mixin === $block && !$orderedArgs) {
 					continue;
@@ -2458,6 +2464,16 @@ protected function parseChunk() {
 						$this->append(array("directive", $dirName, $dirValue));
 						return true;
 					}
+				} elseif ($this->literal(":", true)) {
+					//Ruleset Definition
+					if (($this->openString("{", $dirValue, null, array(";")) || true) &&
+							$this->literal("{"))
+					{
+						$dir = $this->pushBlock($this->fixTags(array("@".$dirName)));
+						$dir->name = $dirName;
+						if (isset($dirValue)) $dir->value = $dirValue;
+						return true;
+					}
 				}
 			}
 

tests/inputs/ruleset.less

@@ -0,0 +1,11 @@
+@detached-ruleset: { background: red; border: none; };
+@detached-ruleset: { background: blue; };
+
+body {
+  .top {
+    @detached-ruleset();
+  }
+}
+.top {
+  @detached-ruleset();
+}

tests/outputs/ruleset.css

@@ -0,0 +1,6 @@
+body .top {
+  background: blue;
+}
+.top {
+  background: blue;
+}