Improve handling of escape sequence in selectors (fixes leafo#178)

Author: robocoder

scss.inc.php

@@ -3911,6 +3911,11 @@ protected function selectorSingle(&$out) {
 				continue;
 			}
 
+			if ($this->match('\\\\\S', $m)) {
+				$parts[] = $m[0];
+				continue;
+			}
+
 			// for keyframes
 			if ($this->unit($unit)) {
 				$parts[] = $unit;
@@ -4034,7 +4039,7 @@ protected function variable(&$out) {
 	}
 
 	protected function keyword(&$word, $eatWhitespace = null) {
-		if ($this->match('([\w_\-\*!"\'\\\\][\w\-_"\'\\\\]*)',
+		if ($this->match('(([\w_\-\*!"\']|[\\\\].)([\w\-_"\']|[\\\\].)*)',
 			$m, $eatWhitespace))
 		{
 			$word = $m[1];

tests/inputs/selectors.scss

@@ -185,3 +185,11 @@ div {
     }
 }
 
+$name: escape;
+.#{$name}\% {
+    color: red;
+}
+
+.escape-plan\% {
+    color: green;
+}

tests/outputs/selectors.css

@@ -333,3 +333,9 @@ div.foo div {
 
 .nice-fonts .main .message div .title, .nice-fonts div .message div .title {
   font-size: 24px; }
+
+.escape\% {
+  color: red; }
+
+.escape-plan\% {
+  color: green; }