Limited identifying identifiers after dots to keywords.

src/compiler/parser.ts

@@ -648,6 +648,10 @@ module ts {
         return SyntaxKind.FirstKeyword <= token && token <= SyntaxKind.LastKeyword;
     }
 
+    export function isTrivia(token: SyntaxKind) {
+        return SyntaxKind.FirstTriviaToken <= token && token <= SyntaxKind.LastTriviaToken;
+    }
+
     export function isModifier(token: SyntaxKind): boolean {
         switch (token) {
             case SyntaxKind.PublicKeyword:

src/services/services.ts

@@ -4556,7 +4556,7 @@ module ts {
                             token = SyntaxKind.RegularExpressionLiteral;
                         }
                     }
-                    else if (lastNonTriviaToken === SyntaxKind.DotToken) {
+                    else if (lastNonTriviaToken === SyntaxKind.DotToken && isKeyword(token)) {
                         token = SyntaxKind.Identifier;
                     }
 
@@ -4611,10 +4611,6 @@ module ts {
                     result.entries.push({ length: length, classification: classification });
                 }
             }
-
-            function isTrivia(token: SyntaxKind) {
-                return SyntaxKind.FirstTriviaToken <= token && token <= SyntaxKind.LastTriviaToken;
-            }
         }
 
         function isBinaryExpressionOperatorToken(token: SyntaxKind): boolean {

tests/cases/unittests/services/colorization.ts

@@ -189,6 +189,12 @@ describe('Colorization', function () {
                 identifier("var"));
         });
 
+        it("correctly classifies a string literal after a dot", function () {
+            test("a.\"var\"",
+                ts.EndOfLineState.Start,
+                stringLiteral("\"var\""));
+        });
+
         it("correctly classifies a keyword after a dot separated by comment trivia", function () {
             test("a./*hello world*/ var",
                 ts.EndOfLineState.Start,