Fixing errors and adding a fourslash test

src/harness/fourslash.ts

@@ -206,6 +206,24 @@ namespace FourSlash {
 
         private inputFiles = ts.createMap<string>();  // Map between inputFile's fileName and its content for easily looking up when resolving references
 
+        private static getDisplayPartsJson(displayParts: ts.SymbolDisplayPart[]) {
+            let result = "";
+            ts.forEach(displayParts, part => {
+                if (result) {
+                    result += ",\n    ";
+                }
+                else {
+                    result = "[\n    ";
+                }
+                result += JSON.stringify(part);
+            });
+            if (result) {
+                result += "\n]";
+            }
+
+            return result;
+        }
+
         // Add input file which has matched file name with the given reference-file path.
         // This is necessary when resolveReference flag is specified
         private addMatchedInputFile(referenceFilePath: string, extensions: string[]) {
@@ -777,6 +795,20 @@ namespace FourSlash {
             ts.forEachProperty(this.rangesByText(), ranges => this.verifyRangesReferenceEachOther(ranges));
         }
 
+        public verifyDisplayPartsOfReferencedSymbol(expected: ts.SymbolDisplayPart[]) {
+            const referencedSymbols = this.findReferencesAtCaret();
+
+            if (referencedSymbols.length === 0) {
+                this.raiseError("No referenced symbols found at current caret position");
+            }
+            else if (referencedSymbols.length > 1) {
+                this.raiseError("More than one referenced symbol found");
+            }
+
+            assert.equal(TestState.getDisplayPartsJson(referencedSymbols[0].definition.displayParts),
+                TestState.getDisplayPartsJson(expected), this.messageAtLastKnownMarker("referenced symbol definition display parts"));
+        }
+
         private verifyReferencesWorker(references: ts.ReferenceEntry[], fileName: string, start: number, end: number, isWriteAccess?: boolean, isDefinition?: boolean) {
             for (let i = 0; i < references.length; i++) {
                 const reference = references[i];
@@ -811,6 +843,10 @@ namespace FourSlash {
             return this.languageService.getReferencesAtPosition(this.activeFile.fileName, this.currentCaretPosition);
         }
 
+        private findReferencesAtCaret() {
+            return this.languageService.findReferences(this.activeFile.fileName, this.currentCaretPosition);
+        }
+
         public getSyntacticDiagnostics(expected: string) {
             const diagnostics = this.languageService.getSyntacticDiagnostics(this.activeFile.fileName);
             this.testDiagnostics(expected, diagnostics);
@@ -856,30 +892,12 @@ namespace FourSlash {
             displayParts: ts.SymbolDisplayPart[],
             documentation: ts.SymbolDisplayPart[]) {
 
-            function getDisplayPartsJson(displayParts: ts.SymbolDisplayPart[]) {
-                let result = "";
-                ts.forEach(displayParts, part => {
-                    if (result) {
-                        result += ",\n    ";
-                    }
-                    else {
-                        result = "[\n    ";
-                    }
-                    result += JSON.stringify(part);
-                });
-                if (result) {
-                    result += "\n]";
-                }
-
-                return result;
-            }
-
             const actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
             assert.equal(actualQuickInfo.kind, kind, this.messageAtLastKnownMarker("QuickInfo kind"));
             assert.equal(actualQuickInfo.kindModifiers, kindModifiers, this.messageAtLastKnownMarker("QuickInfo kindModifiers"));
             assert.equal(JSON.stringify(actualQuickInfo.textSpan), JSON.stringify(textSpan), this.messageAtLastKnownMarker("QuickInfo textSpan"));
-            assert.equal(getDisplayPartsJson(actualQuickInfo.displayParts), getDisplayPartsJson(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
-            assert.equal(getDisplayPartsJson(actualQuickInfo.documentation), getDisplayPartsJson(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
+            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.displayParts), TestState.getDisplayPartsJson(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
+            assert.equal(TestState.getDisplayPartsJson(actualQuickInfo.documentation), TestState.getDisplayPartsJson(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
         }
 
         public verifyRenameLocations(findInStrings: boolean, findInComments: boolean, ranges?: Range[]) {
@@ -2947,6 +2965,10 @@ namespace FourSlashInterface {
             this.state.verifyRangesReferenceEachOther(ranges);
         }
 
+        public findReferencesDefinitionDisplayPartsAtCaretAre(expected: ts.SymbolDisplayPart[]) {
+            this.state.verifyDisplayPartsOfReferencedSymbol(expected);
+        }
+
         public rangesWithSameTextReferenceEachOther() {
             this.state.verifyRangesWithSameTextReferenceEachOther();
         }

src/services/services.ts

@@ -6328,7 +6328,8 @@ namespace ts {
                     fileName: targetLabel.getSourceFile().fileName,
                     kind: ScriptElementKind.label,
                     name: labelName,
-                    textSpan: createTextSpanFromBounds(targetLabel.getStart(), targetLabel.getEnd())
+                    textSpan: createTextSpanFromBounds(targetLabel.getStart(), targetLabel.getEnd()),
+                    displayParts: [displayPart(labelName, SymbolDisplayPartKind.text)]
                 };
 
                 return [{ definition, references }];
@@ -6568,6 +6569,11 @@ namespace ts {
                     getThisReferencesInFile(sourceFile, searchSpaceNode, possiblePositions, references);
                 }
 
+                const thisOrSuperSymbol = typeChecker.getSymbolAtLocation(thisOrSuperKeyword);
+
+                const { displayParts } =  getSymbolDisplayPartsDocumentationAndSymbolKind(
+                    thisOrSuperSymbol, thisOrSuperKeyword.getSourceFile(), getContainerNode(thisOrSuperKeyword), thisOrSuperKeyword);
+
                 return [{
                     definition: {
                         containerKind: "",
@@ -6575,7 +6581,8 @@ namespace ts {
                         fileName: node.getSourceFile().fileName,
                         kind: ScriptElementKind.variableElement,
                         name: "this",
-                        textSpan: createTextSpanFromBounds(node.getStart(), node.getEnd())
+                        textSpan: createTextSpanFromBounds(node.getStart(), node.getEnd()),
+                        displayParts
                     },
                     references: references
                 }];

tests/cases/fourslash/findReferencesDefinitionDisplayParts.ts

@@ -0,0 +1,23 @@
+/// <reference path='fourslash.ts'/>
+
+//// class Gre/*1*/eter {
+////     someFunction() { th/*2*/is;  }
+//// }
+////
+//// type Options = "opt/*3*/ion 1" | "option 2";
+//// let myOption: Options = "option 1";
+////
+//// some/*4*/Label:
+//// break someLabel;
+
+goTo.marker("1");
+verify.findReferencesDefinitionDisplayPartsAtCaretAre([{ text: "class", kind: "keyword" }, { text: " ", kind: "space" }, { text: "Greeter", kind: "className" }]);
+
+goTo.marker("2");
+verify.findReferencesDefinitionDisplayPartsAtCaretAre([{ text: "this", kind: "keyword" }, { text: ":", kind: "punctuation" }, { text: " ", kind: "space" }, { text: "this", kind: "keyword" }]);
+
+goTo.marker("3");
+verify.findReferencesDefinitionDisplayPartsAtCaretAre([{ text: "\"option 1\"", kind: "stringLiteral" }]);
+
+goTo.marker("4");
+verify.findReferencesDefinitionDisplayPartsAtCaretAre([{ text: "someLabel", kind: "text" }]);

tests/cases/fourslash/fourslash.ts

@@ -171,6 +171,7 @@ declare namespace FourSlashInterface {
          * If `ranges` is omitted, this is `test.ranges()`.
          */
         rangesReferenceEachOther(ranges?: Range[]): void;
+        findReferencesDefinitionDisplayPartsAtCaretAre(expected: ts.SymbolDisplayPart[]): void;
         rangesWithSameTextReferenceEachOther(): void;
         currentParameterHelpArgumentNameIs(name: string): void;
         currentParameterSpanIs(parameter: string): void;