Return all symbols in navto for empty string pattern (microsoft#55550)

Author: gabritto

src/harness/fourslashImpl.ts

@@ -3766,7 +3766,8 @@ export class TestState {
 
     public verifyNavigateTo(options: readonly FourSlashInterface.VerifyNavigateToOptions[]): void {
         for (const { pattern, expected, fileName } of options) {
-            const items = this.languageService.getNavigateToItems(pattern, /*maxResultCount*/ undefined, fileName);
+            const file = fileName && this.findFile(fileName).fileName;
+            const items = this.languageService.getNavigateToItems(pattern, /*maxResultCount*/ undefined, file);
             this.assertObjectsEqual(
                 items,
                 expected.map((e): ts.NavigateToItem => ({

src/services/patternMatcher.ts

@@ -121,6 +121,15 @@ export function createPatternMatcher(pattern: string): PatternMatcher | undefine
     const stringToWordSpans = new Map<string, TextSpan[]>();
 
     const dotSeparatedSegments = pattern.trim().split(".").map(p => createSegment(p.trim()));
+
+    // The pattern is an empty string, and it matches everything.
+    if (dotSeparatedSegments.length === 1 && dotSeparatedSegments[0].totalTextChunk.text === "") {
+        return {
+            getMatchForLastSegmentOfPattern: () => createPatternMatch(PatternMatchKind.substring, /*isCaseSensitive*/ true),
+            getFullMatch: () => createPatternMatch(PatternMatchKind.substring, /*isCaseSensitive*/ true),
+            patternContainsDots: false,
+        };
+    }
     // A segment is considered invalid if we couldn't find any words in it.
     if (dotSeparatedSegments.some(segment => !segment.subWordTextChunks.length)) return undefined;
 

src/testRunner/unittests/services/patternMatcher.ts

@@ -248,14 +248,6 @@ describe("unittests:: services:: PatternMatcher", () => {
             assertSegmentMatch("AddMetadataReference", "AMRe", { kind: ts.PatternMatchKind.camelCase, isCaseSensitive: true });
         });
 
-        it("BlankPattern", () => {
-            assertInvalidPattern("");
-        });
-
-        it("WhitespaceOnlyPattern", () => {
-            assertInvalidPattern(" ");
-        });
-
         it("EachWordSeparately1", () => {
             assertSegmentMatch("AddMetadataReference", "add Meta", { kind: ts.PatternMatchKind.prefix, isCaseSensitive: false });
         });
@@ -324,10 +316,6 @@ describe("unittests:: services:: PatternMatcher", () => {
         assert.deepEqual(ts.createPatternMatcher(pattern)!.getMatchForLastSegmentOfPattern(candidate), expected);
     }
 
-    function assertInvalidPattern(pattern: string) {
-        assert.equal(ts.createPatternMatcher(pattern), undefined);
-    }
-
     function assertFullMatch(dottedContainer: string, candidate: string, pattern: string, expected: ts.PatternMatch | undefined): void {
         assert.deepEqual(ts.createPatternMatcher(pattern)!.getFullMatch(dottedContainer.split("."), candidate), expected);
     }

tests/cases/fourslash/declareFunction.ts

@@ -1,5 +1,6 @@
 /// <reference path="fourslash.ts" />
 
+// @filename: index.ts
 ////declare function
 
-verify.navigateTo({ pattern: "", expected: [] });
+verify.navigateTo({ pattern: "", fileName: "index.ts", expected: [] });

tests/cases/fourslash/incorrectJsDocObjectLiteralType.ts

@@ -3,7 +3,7 @@
 // @Filename: /a.ts
 ////
 
-verify.navigateTo({ pattern: "", expected: [] });
+verify.navigateTo({ pattern: "", fileName: "/a.ts", expected: [] });
 edit.insert("/**\n * @typedef {Object} foo\n * @property {any} [obj]\n */\nexport default function foo() {\n}");
 verify.navigateTo({
     pattern: "foo",

tests/cases/fourslash/navto_emptyPattern.ts

@@ -0,0 +1,25 @@
+/// <reference path="fourslash.ts"/>
+
+// @filename: foo.ts
+//// const [|x: number = 1|];
+//// [|function y(x: string): string { return x; }|]
+
+
+const [x, y] = test.ranges();
+
+verify.navigateTo({
+    pattern: "",
+    fileName: "foo.ts",
+    expected: [{
+        name: "x",
+        kind: "const",
+        range: x,
+        matchKind: "substring",
+    },
+    {
+        name: "y",
+        kind: "function",
+        range: y,
+        matchKind: "substring",
+    }],
+});