Add 'move to new file' refactor

src/compiler/core.ts

@@ -311,8 +311,8 @@ namespace ts {
     }
 
     /** Works like Array.prototype.findIndex, returning `-1` if no element satisfying the predicate is found. */
-    export function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean): number {
-        for (let i = 0; i < array.length; i++) {
+    export function findIndex<T>(array: ReadonlyArray<T>, predicate: (element: T, index: number) => boolean, startIndex = 0): number {
+        for (let i = startIndex; i < array.length; i++) {
             if (predicate(array[i], i)) {
                 return i;
             }

src/compiler/diagnosticMessages.json

@@ -4165,5 +4165,9 @@
     "Generate 'get' and 'set' accessors": {
         "category": "Message",
         "code": 95046
+    },
+    "Move to new file": {
+        "category": "Message",
+        "code": 95047
     }
 }

src/harness/fourslash.ts

@@ -2950,9 +2950,7 @@ Actual: ${stringify(fullActual)}`);
         }
 
         public verifyApplicableRefactorAvailableAtMarker(negative: boolean, markerName: string) {
-            const marker = this.getMarkerByName(markerName);
-            const applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, marker.position, ts.defaultPreferences);
-            const isAvailable = applicableRefactors && applicableRefactors.length > 0;
+            const isAvailable = this.getApplicableRefactors(this.getMarkerByName(markerName).position).length > 0;
             if (negative && isAvailable) {
                 this.raiseError(`verifyApplicableRefactorAvailableAtMarker failed - expected no refactor at marker ${markerName} but found some.`);
             }
@@ -2969,9 +2967,7 @@ Actual: ${stringify(fullActual)}`);
         }
 
         public verifyRefactorAvailable(negative: boolean, name: string, actionName?: string) {
-            const selection = this.getSelection();
-
-            let refactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, selection, ts.defaultPreferences) || [];
+            let refactors = this.getApplicableRefactors(this.getSelection());
             refactors = refactors.filter(r => r.name === name && (actionName === undefined || r.actions.some(a => a.name === actionName)));
             const isAvailable = refactors.length > 0;
 
@@ -2991,10 +2987,7 @@ Actual: ${stringify(fullActual)}`);
         }
 
         public verifyRefactor({ name, actionName, refactors }: FourSlashInterface.VerifyRefactorOptions) {
-            const selection = this.getSelection();
-
-            const actualRefactors = (this.languageService.getApplicableRefactors(this.activeFile.fileName, selection, ts.defaultPreferences) || ts.emptyArray)
-                .filter(r => r.name === name && r.actions.some(a => a.name === actionName));
+            const actualRefactors = this.getApplicableRefactors(this.getSelection()).filter(r => r.name === name && r.actions.some(a => a.name === actionName));
             this.assertObjectsEqual(actualRefactors, refactors);
         }
 
@@ -3004,8 +2997,7 @@ Actual: ${stringify(fullActual)}`);
                 throw new Error("Exactly one refactor range is allowed per test.");
             }
 
-            const applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, ts.first(ranges), ts.defaultPreferences);
-            const isAvailable = applicableRefactors && applicableRefactors.length > 0;
+            const isAvailable = this.getApplicableRefactors(ts.first(ranges)).length > 0;
             if (negative && isAvailable) {
                 this.raiseError(`verifyApplicableRefactorAvailableForRange failed - expected no refactor but found some.`);
             }
@@ -3016,7 +3008,7 @@ Actual: ${stringify(fullActual)}`);
 
         public applyRefactor({ refactorName, actionName, actionDescription, newContent: newContentWithRenameMarker }: FourSlashInterface.ApplyRefactorOptions) {
             const range = this.getSelection();
-            const refactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, range, ts.defaultPreferences);
+            const refactors = this.getApplicableRefactors(range);
             const refactorsWithName = refactors.filter(r => r.name === refactorName);
             if (refactorsWithName.length === 0) {
                 this.raiseError(`The expected refactor: ${refactorName} is not available at the marker location.\nAvailable refactors: ${refactors.map(r => r.name)}`);
@@ -3062,7 +3054,38 @@ Actual: ${stringify(fullActual)}`);
                     return { renamePosition, newContent };
                 }
             }
+        }
+
+        public moveToNewFile(options: FourSlashInterface.MoveToNewFileOptions): void {
+            assert(this.getRanges().length === 1);
+            const range = this.getRanges()[0];
+            const refactor = ts.find(this.getApplicableRefactors(range), r => r.name === "Move to new file");
+            assert(refactor.actions.length === 1);
+            const action = ts.first(refactor.actions);
+            assert(action.name === "Move to new file" && action.description === "Move to new file");
+
+            const editInfo = this.languageService.getEditsForRefactor(this.activeFile.fileName, this.formatCodeSettings, range, refactor.name, action.name, ts.defaultPreferences);
+            for (const edit of editInfo.edits) {
+                const newContent = options.newFileContents[edit.fileName];
+                if (newContent === undefined) {
+                    this.raiseError(`There was an edit in ${edit.fileName} but new content was not specified.`);
+                }
+                if (this.testData.files.some(f => f.fileName === edit.fileName)) {
+                    this.applyEdits(edit.fileName, edit.textChanges, /*isFormattingEdit*/ false);
+                    this.openFile(edit.fileName);
+                    this.verifyCurrentFileContent(newContent);
+                }
+                else {
+                    assert(edit.textChanges.length === 1);
+                    const change = ts.first(edit.textChanges);
+                    assert.deepEqual(change.span, ts.createTextSpan(0, 0));
+                    assert.equal(change.newText, newContent, `Content for ${edit.fileName}`);
+                }
+            }
 
+            for (const fileName in options.newFileContents) {
+                assert(editInfo.edits.some(e => e.fileName === fileName));
+            }
         }
 
         public verifyFileAfterApplyingRefactorAtMarker(
@@ -3278,6 +3301,10 @@ Actual: ${stringify(fullActual)}`);
                 this.verifyCurrentFileContent(options.newFileContents[fileName]);
             }
         }
+
+        private getApplicableRefactors(positionOrRange: number | ts.TextRange): ReadonlyArray<ts.ApplicableRefactorInfo> {
+            return this.languageService.getApplicableRefactors(this.activeFile.fileName, positionOrRange, ts.defaultPreferences) || ts.emptyArray;
+        }
     }
 
     export function runFourSlashTest(basePath: string, testType: FourSlashTestType, fileName: string) {
@@ -4373,6 +4400,10 @@ namespace FourSlashInterface {
         public getEditsForFileRename(options: GetEditsForFileRenameOptions) {
             this.state.getEditsForFileRename(options);
         }
+
+        public moveToNewFile(options: MoveToNewFileOptions): void {
+            this.state.moveToNewFile(options);
+        }
     }
 
     export class Edit {
@@ -4721,4 +4752,8 @@ namespace FourSlashInterface {
         readonly newPath: string;
         readonly newFileContents: { readonly [fileName: string]: string };
     }
+
+    export interface MoveToNewFileOptions {
+        readonly newFileContents: { readonly [fileName: string]: string };
+    }
 }

src/harness/tsconfig.json

@@ -115,6 +115,7 @@
         "../services/codefixes/useDefaultImport.ts",
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
+        "../services/refactors/moveToNewFile.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",

src/server/tsconfig.json

@@ -111,6 +111,7 @@
         "../services/codefixes/useDefaultImport.ts",
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
+        "../services/refactors/moveToNewFile.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",

src/server/tsconfig.library.json

@@ -117,6 +117,7 @@
         "../services/codefixes/useDefaultImport.ts",
         "../services/refactors/extractSymbol.ts",
         "../services/refactors/generateGetAccessorAndSetAccessor.ts",
+        "../services/refactors/moveToNewFile.ts",
         "../services/sourcemaps.ts",
         "../services/services.ts",
         "../services/breakpoints.ts",

src/services/codefixes/convertToEs6Module.ts

@@ -507,15 +507,6 @@ namespace ts.codefix {
             : makeImport(/*name*/ undefined, [makeImportSpecifier(propertyName, localName)], moduleSpecifier);
     }
 
-    function makeImport(name: Identifier | undefined, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: StringLiteralLike): ImportDeclaration {
-        return makeImportDeclaration(name, namedImports, moduleSpecifier);
-    }
-
-    export function makeImportDeclaration(name: Identifier, namedImports: ReadonlyArray<ImportSpecifier> | undefined, moduleSpecifier: Expression) {
-        const importClause = (name || namedImports) && createImportClause(name, namedImports && createNamedImports(namedImports));
-        return createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, importClause, moduleSpecifier);
-    }
-
     function makeImportSpecifier(propertyName: string | undefined, name: string): ImportSpecifier {
         return createImportSpecifier(propertyName !== undefined && propertyName !== name ? createIdentifier(propertyName) : undefined, createIdentifier(name));
     }

src/services/codefixes/fixInvalidImportSyntax.ts

@@ -28,7 +28,7 @@ namespace ts.codefix {
         const variations: CodeFixAction[] = [];
 
         // import Bluebird from "bluebird";
-        variations.push(createAction(context, sourceFile, node, makeImportDeclaration(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier)));
+        variations.push(createAction(context, sourceFile, node, makeImport(namespace.name, /*namedImports*/ undefined, node.moduleSpecifier)));
 
         if (getEmitModuleKind(opts) === ModuleKind.CommonJS) {
             // import Bluebird = require("bluebird");

src/services/codefixes/useDefaultImport.ts

@@ -37,6 +37,6 @@ namespace ts.codefix {
     }
 
     function doChange(changes: textChanges.ChangeTracker, sourceFile: SourceFile, info: Info): void {
-        changes.replaceNode(sourceFile, info.importNode, makeImportDeclaration(info.name, /*namedImports*/ undefined, info.moduleSpecifier));
+        changes.replaceNode(sourceFile, info.importNode, makeImport(info.name, /*namedImports*/ undefined, info.moduleSpecifier));
     }
 }

src/services/importTracker.ts

@@ -248,7 +248,7 @@ namespace ts.FindAllReferences {
                 const { name } = importClause;
                 // If a default import has the same name as the default export, allow to rename it.
                 // Given `import f` and `export default function f`, we will rename both, but for `import g` we will rename just that.
-                if (name && (!isForRename || name.escapedText === symbolName(exportSymbol))) {
+                if (name && (!isForRename || name.escapedText === symbolEscapedNameNoDefault(exportSymbol))) {
                     const defaultImportAlias = checker.getSymbolAtLocation(name);
                     addSearch(name, defaultImportAlias);
                 }
@@ -534,7 +534,7 @@ namespace ts.FindAllReferences {
             // If the import has a different name than the export, do not continue searching.
             // If `importedName` is undefined, do continue searching as the export is anonymous.
             // (All imports returned from this function will be ignored anyway if we are in rename and this is a not a named export.)
-            const importedName = symbolName(importedSymbol);
+            const importedName = symbolEscapedNameNoDefault(importedSymbol);
             if (importedName === undefined || importedName === InternalSymbolName.Default || importedName === symbol.escapedName) {
                 return { kind: ImportExport.Import, symbol: importedSymbol, ...isImport };
             }
@@ -606,17 +606,6 @@ namespace ts.FindAllReferences {
         return isExternalModuleSymbol(exportingModuleSymbol) ? { exportingModuleSymbol, exportKind } : undefined;
     }
 
-    function symbolName(symbol: Symbol): __String | undefined {
-        if (symbol.escapedName !== InternalSymbolName.Default) {
-            return symbol.escapedName;
-        }
-
-        return forEach(symbol.declarations, decl => {
-            const name = getNameOfDeclaration(decl);
-            return name && name.kind === SyntaxKind.Identifier && name.escapedText;
-        });
-    }
-
     /** If at an export specifier, go to the symbol it refers to. */
     function skipExportSpecifierSymbol(symbol: Symbol, checker: TypeChecker): Symbol {
         // For `export { foo } from './bar", there's nothing to skip, because it does not create a new alias. But `export { foo } does.

src/services/refactorProvider.ts

@@ -38,7 +38,7 @@ namespace ts {
         }
     }
 
-    export function getRefactorContextLength(context: RefactorContext): number {
-        return context.endPosition === undefined ? 0 : context.endPosition - context.startPosition;
+    export function getRefactorContextSpan({ startPosition, endPosition }: RefactorContext): TextSpan {
+        return createTextSpanFromBounds(startPosition, endPosition === undefined ? startPosition : endPosition);
     }
 }

src/services/refactors/extractSymbol.ts

@@ -8,7 +8,7 @@ namespace ts.refactor.extractSymbol {
      * Exported for tests.
      */
     export function getAvailableActions(context: RefactorContext): ApplicableRefactorInfo[] | undefined {
-        const rangeToExtract = getRangeToExtract(context.file, { start: context.startPosition, length: getRefactorContextLength(context) });
+        const rangeToExtract = getRangeToExtract(context.file, getRefactorContextSpan(context));
 
         const targetRange: TargetRange = rangeToExtract.targetRange;
         if (targetRange === undefined) {
@@ -87,7 +87,7 @@ namespace ts.refactor.extractSymbol {
 
     /* Exported for tests */
     export function getEditsForAction(context: RefactorContext, actionName: string): RefactorEditInfo | undefined {
-        const rangeToExtract = getRangeToExtract(context.file, { start: context.startPosition, length: getRefactorContextLength(context) });
+        const rangeToExtract = getRangeToExtract(context.file, getRefactorContextSpan(context));
         const targetRange: TargetRange = rangeToExtract.targetRange;
 
         const parsedFunctionIndexMatch = /^function_scope_(\d+)$/.exec(actionName);