Add interface LabelledStatementInfo

Author: JsonFreeman

src/compiler/parser.ts

@@ -385,6 +385,14 @@ module ts {
  CrossingFunctionBoundary
  }
 
+ interface LabelledStatementInfo {
+ addLabel(label: Identifier): void;
+ pushCurrentLabelSet(isIterationStatement: boolean): void;
+ pushFunctionBoundary(): void;
+ pop(): void;
+ nodeIsNestedInLabel(label: Identifier, requireIterationStatement: boolean, stopAtFunctionBoundary: boolean): ControlBlockContext;
+ }
+
  export function createSourceFile(filename: string, sourceText: string, languageVersion: ScriptTarget): SourceFile {
  var file: SourceFile;
  var scanner: Scanner;
@@ -402,8 +410,7 @@ module ts {
  var inSwitchStatement = ControlBlockContext.NotNested;
  var inIterationStatement = ControlBlockContext.NotNested;
 
- var labelledStatementInfo = (() => {
- // TODO(jfreeman): Implement a data structure for tracking labels
+ var labelledStatementInfo: LabelledStatementInfo = (() => {
  var functionBoundarySentinel: StringSet = {};
  var currentLabelSet: StringSet;
  var labelSetStack: StringSet[];