Adding preparePasteEdits method to check if smart copy/paste should be applied

src/harness/client.ts

@@ -1020,6 +1020,16 @@ export class SessionClient implements LanguageService {
         return getSupportedCodeFixes();
     }
 
+    preparePasteEditsForFile(copiedFromFile: string, copiedTextSpan: TextRange[]): boolean {
+        const args: protocol.PreparePasteEditsRequestArgs = {
+            file: copiedFromFile,
+            copiedTextSpan: copiedTextSpan.map(span => ({ start: this.positionToOneBasedLineOffset(copiedFromFile, span.pos), end: this.positionToOneBasedLineOffset(copiedFromFile, span.end) })),
+        };
+        const request = this.processRequest<protocol.PreparePasteEditsRequest>(protocol.CommandTypes.PreparePasteEdits, args);
+        const response = this.processResponse<protocol.PreparePasteEditsResponse>(request);
+        return response.body;
+    }
+
     getPasteEdits(
         { targetFile, pastedText, pasteLocations, copiedFrom }: PasteEditsArgs,
         formatOptions: FormatCodeSettings,

src/harness/fourslashImpl.ts

@@ -3630,6 +3630,13 @@ export class TestState {
         assert.deepEqual(actualModuleSpecifiers, moduleSpecifiers);
     }
 
+    public verifyPreparePasteEdits(options: FourSlashInterface.PreparePasteEditsOptions): void {
+        const providePasteEdits = this.languageService.preparePasteEditsForFile(options.copiedFromFile, options.copiedTextRange);
+        if (providePasteEdits !== options.providePasteEdits) {
+            this.raiseError(`preparePasteEdits failed - Expected prepare paste edits to return ${options.providePasteEdits}, but got ${providePasteEdits}.`);
+        }
+    }
+
     public verifyPasteEdits(options: FourSlashInterface.PasteEditsOptions): void {
         const editInfo = this.languageService.getPasteEdits({ targetFile: this.activeFile.fileName, pastedText: options.args.pastedText, pasteLocations: options.args.pasteLocations, copiedFrom: options.args.copiedFrom, preferences: options.args.preferences }, this.formatCodeSettings);
         this.verifyNewContent({ newFileContent: options.newFileContents }, editInfo.edits);

src/harness/fourslashInterfaceImpl.ts

@@ -657,6 +657,9 @@ export class Verify extends VerifyNegatable {
         this.state.verifyOrganizeImports(newContent, mode, preferences);
     }
 
+    public preparePasteEdits(options: PreparePasteEditsOptions): void {
+        this.state.verifyPreparePasteEdits(options);
+    }
     public pasteEdits(options: PasteEditsOptions): void {
         this.state.verifyPasteEdits(options);
     }
@@ -2017,6 +2020,11 @@ export interface MoveToFileOptions {
     readonly preferences?: ts.UserPreferences;
 }
 
+export interface PreparePasteEditsOptions {
+    readonly providePasteEdits: boolean;
+    readonly copiedTextRange: ts.TextRange[];
+    readonly copiedFromFile: string;
+}
 export interface PasteEditsOptions {
     readonly newFileContents: { readonly [fileName: string]: string; };
     args: ts.PasteEditsArgs;

src/server/protocol.ts

@@ -169,6 +169,7 @@ export const enum CommandTypes {
     GetApplicableRefactors = "getApplicableRefactors",
     GetEditsForRefactor = "getEditsForRefactor",
     GetMoveToRefactoringFileSuggestions = "getMoveToRefactoringFileSuggestions",
+    PreparePasteEdits = "preparePasteEdits",
     GetPasteEdits = "getPasteEdits",
     /** @internal */
     GetEditsForRefactorFull = "getEditsForRefactor-full",
@@ -671,6 +672,20 @@ export interface GetMoveToRefactoringFileSuggestions extends Response {
     };
 }
 
+/**
+ * Request to check if `pasteEdits` should be provided for a given location post copying text from that location.
+ */
+export interface PreparePasteEditsRequest extends FileRequest {
+    command: CommandTypes.PreparePasteEdits;
+    arguments: PreparePasteEditsRequestArgs;
+}
+export interface PreparePasteEditsRequestArgs extends FileRequestArgs {
+    copiedTextSpan: TextSpan[];
+}
+export interface PreparePasteEditsResponse extends Response {
+    body: boolean;
+}
+
 /**
  * Request refactorings at a given position post pasting text from some other location.
  */

src/server/session.ts

@@ -966,6 +966,7 @@ const invalidSyntacticModeCommands: readonly protocol.CommandTypes[] = [
     protocol.CommandTypes.NavtoFull,
     protocol.CommandTypes.DocumentHighlights,
     protocol.CommandTypes.DocumentHighlightsFull,
+    protocol.CommandTypes.PreparePasteEdits,
 ];
 
 export interface SessionOptions {
@@ -2966,6 +2967,10 @@ export class Session<TMessage = string> implements EventSender {
         return project.getLanguageService().getMoveToRefactoringFileSuggestions(file, this.extractPositionOrRange(args, scriptInfo), this.getPreferences(file));
     }
 
+    private preparePasteEdits(args: protocol.PreparePasteEditsRequestArgs): boolean {
+        const { file, project } = this.getFileAndProject(args);
+        return project.getLanguageService().preparePasteEditsForFile(file, args.copiedTextSpan.map(copies => this.getRange({ file, startLine: copies.start.line, startOffset: copies.start.offset, endLine: copies.end.line, endOffset: copies.end.offset }, this.projectService.getScriptInfoForNormalizedPath(file)!)));
+    }
     private getPasteEdits(args: protocol.GetPasteEditsRequestArgs): protocol.PasteEditsAction | undefined {
         const { file, project } = this.getFileAndProject(args);
         const copiedFrom = args.copiedFrom
@@ -3716,6 +3721,9 @@ export class Session<TMessage = string> implements EventSender {
         [protocol.CommandTypes.GetMoveToRefactoringFileSuggestions]: (request: protocol.GetMoveToRefactoringFileSuggestionsRequest) => {
             return this.requiredResponse(this.getMoveToRefactoringFileSuggestions(request.arguments));
         },
+        [protocol.CommandTypes.PreparePasteEdits]: (request: protocol.PreparePasteEditsRequest) => {
+            return this.requiredResponse(this.preparePasteEdits(request.arguments));
+        },
         [protocol.CommandTypes.GetPasteEdits]: (request: protocol.GetPasteEditsRequest) => {
             return this.requiredResponse(this.getPasteEdits(request.arguments));
         },

src/services/_namespaces/ts.preparePasteEdits.ts

@@ -0,0 +1 @@
+export * from "../preparePasteEdits.js";

src/services/_namespaces/ts.ts

@@ -58,5 +58,7 @@ import * as textChanges from "./ts.textChanges.js";
 export { textChanges };
 import * as formatting from "./ts.formatting.js";
 export { formatting };
+import * as PreparePasteEdits from "./ts.preparePasteEdits.js";
+export { PreparePasteEdits };
 import * as pasteEdits from "./ts.PasteEdits.js";
 export { pasteEdits };

src/services/preparePasteEdits.ts

@@ -0,0 +1,46 @@
+import {
+    findAncestor,
+    forEachChild,
+    getTokenAtPosition,
+    isIdentifier,
+    rangeContainsPosition,
+    rangeContainsRange,
+    SourceFile,
+    SymbolFlags,
+    TextRange,
+    TypeChecker,
+} from "./_namespaces/ts.js";
+import { isInImport } from "./refactors/moveToFile.js";
+
+/** @internal */
+export function preparePasteEdits(
+    sourceFile: SourceFile,
+    copiedFromRange: TextRange[],
+    checker: TypeChecker,
+): boolean {
+    let shouldProvidePasteEdits = false;
+    copiedFromRange.forEach(range => {
+        const enclosingNode = findAncestor(
+            getTokenAtPosition(sourceFile, range.pos),
+            ancestorNode => rangeContainsRange(ancestorNode, range),
+        );
+        if (!enclosingNode) return;
+        forEachChild(enclosingNode, function checkNameResolution(node) {
+            if (shouldProvidePasteEdits) return;
+            if (isIdentifier(node) && rangeContainsPosition(range, node.getStart(sourceFile))) {
+                const resolvedSymbol = checker.resolveName(node.text, node, SymbolFlags.All, /*excludeGlobals*/ false);
+                if (resolvedSymbol && resolvedSymbol.declarations) {
+                    for (const decl of resolvedSymbol.declarations) {
+                        if (isInImport(decl) || !!(node.text && sourceFile.symbol && sourceFile.symbol.exports?.has(node.escapedText))) {
+                            shouldProvidePasteEdits = true;
+                            return;
+                        }
+                    }
+                }
+            }
+            node.forEachChild(checkNameResolution);
+        });
+        if (shouldProvidePasteEdits) return;
+    });
+    return shouldProvidePasteEdits;
+}

src/services/refactors/moveToFile.ts

@@ -1000,8 +1000,8 @@ function forEachTopLevelDeclaration<T>(statement: Statement, cb: (node: TopLevel
         }
     }
 }
-
-function isInImport(decl: Declaration) {
+/** @internal */
+export function isInImport(decl: Declaration): boolean {
     switch (decl.kind) {
         case SyntaxKind.ImportEqualsDeclaration:
         case SyntaxKind.ImportSpecifier:

src/services/services.ts

@@ -258,6 +258,7 @@ import {
     positionIsSynthesized,
     PossibleProgramFileInfo,
     PragmaMap,
+    PreparePasteEdits,
     PrivateIdentifier,
     Program,
     PropertyName,
@@ -1613,6 +1614,7 @@ const invalidOperationsInSyntacticMode: readonly (keyof LanguageService)[] = [
     "getRenameInfo",
     "findRenameLocations",
     "getApplicableRefactors",
+    "preparePasteEditsForFile",
 ];
 export function createLanguageService(
     host: LanguageServiceHost,
@@ -2300,6 +2302,15 @@ export function createLanguageService(
         };
     }
 
+    function preparePasteEditsForFile(fileName: string, copiedTextRange: TextRange[]): boolean {
+        synchronizeHostData();
+        return PreparePasteEdits.preparePasteEdits(
+            getValidSourceFile(fileName),
+            copiedTextRange,
+            program.getTypeChecker(),
+        );
+    }
+
     function getPasteEdits(
         args: PasteEditsArgs,
         formatOptions: FormatCodeSettings,
@@ -3416,6 +3427,7 @@ export function createLanguageService(
         uncommentSelection,
         provideInlayHints,
         getSupportedCodeFixes,
+        preparePasteEditsForFile,
         getPasteEdits,
         mapCode,
     };

src/services/types.ts

@@ -699,6 +699,7 @@ export interface LanguageService {
     /** @internal */ mapCode(fileName: string, contents: string[], focusLocations: TextSpan[][] | undefined, formatOptions: FormatCodeSettings, preferences: UserPreferences): readonly FileTextChanges[];
 
     dispose(): void;
+    preparePasteEditsForFile(fileName: string, copiedTextRanges: TextRange[]): boolean;
     getPasteEdits(
         args: PasteEditsArgs,
         formatOptions: FormatCodeSettings,

tests/baselines/reference/api/typescript.d.ts

@@ -107,6 +107,7 @@ declare namespace ts {
                 GetApplicableRefactors = "getApplicableRefactors",
                 GetEditsForRefactor = "getEditsForRefactor",
                 GetMoveToRefactoringFileSuggestions = "getMoveToRefactoringFileSuggestions",
+                PreparePasteEdits = "preparePasteEdits",
                 GetPasteEdits = "getPasteEdits",
                 OrganizeImports = "organizeImports",
                 GetEditsForFileRename = "getEditsForFileRename",
@@ -514,6 +515,19 @@ declare namespace ts {
                     files: string[];
                 };
             }
+            /**
+             * Request to check if `pasteEdits` should be provided for a given location post copying text from that location.
+             */
+            export interface PreparePasteEditsRequest extends FileRequest {
+                command: CommandTypes.PreparePasteEdits;
+                arguments: PreparePasteEditsRequestArgs;
+            }
+            export interface PreparePasteEditsRequestArgs extends FileRequestArgs {
+                copiedTextSpan: TextSpan[];
+            }
+            export interface PreparePasteEditsResponse extends Response {
+                body: boolean;
+            }
             /**
              * Request refactorings at a given position post pasting text from some other location.
              */
@@ -3556,6 +3570,7 @@ declare namespace ts {
             private getApplicableRefactors;
             private getEditsForRefactor;
             private getMoveToRefactoringFileSuggestions;
+            private preparePasteEdits;
             private getPasteEdits;
             private organizeImports;
             private getEditsForFileRename;
@@ -10211,6 +10226,7 @@ declare namespace ts {
         uncommentSelection(fileName: string, textRange: TextRange): TextChange[];
         getSupportedCodeFixes(fileName?: string): readonly string[];
         dispose(): void;
+        preparePasteEditsForFile(fileName: string, copiedTextRanges: TextRange[]): boolean;
         getPasteEdits(args: PasteEditsArgs, formatOptions: FormatCodeSettings): PasteEdits;
     }
     interface JsxClosingTagInfo {

tests/cases/fourslash/fourslash.ts

@@ -458,6 +458,11 @@ declare namespace FourSlashInterface {
         toggleMultilineComment(newFileContent: string): void;
         commentSelection(newFileContent: string): void;
         uncommentSelection(newFileContent: string): void;
+        preparePasteEdits(options: {
+            copiedFromFile: string,
+            copiedTextRange: { pos: number, end: number }[],
+            providePasteEdits: boolean
+        }): void;
         pasteEdits(options: {
             newFileContents: { readonly [fileName: string]: string };
             args: {

tests/cases/fourslash/preparePasteEdits_multipleLocations.ts

@@ -0,0 +1,22 @@
+/// <reference path='fourslash.ts' />
+
+// @module: commonjs
+// @allowJs: true
+
+// @Filename: /file1.js
+//// import { aa, bb } = require("./other");
+//// [|const r = 10;|]
+//// export const s = 12;
+//// [|export const t = aa + bb + r + s;
+//// const u = 1;|]
+
+// @Filename: /other.js
+//// export const aa = 1;
+//// export const bb = 2;
+//// module.exports = { aa, bb };
+
+verify.preparePasteEdits({
+    copiedFromFile: "/file1.js",
+    copiedTextRange: test.ranges(),
+    providePasteEdits: true,
+})

tests/cases/fourslash/preparePasteEdits_resolvedIdentifiers.ts

@@ -0,0 +1,20 @@
+/// <reference path='./fourslash.ts' />
+
+// @Filename: /file2.ts
+////import { b } from './file1';
+////export const a = 1;
+//// [|function MyFunction() {}
+//// namespace MyFunction {
+////     export const value = b;
+//// }|]
+////const c = a + 20;
+////const t = 9;
+
+// @Filename: /file1.ts
+////export const b = 2;
+
+verify.preparePasteEdits({
+    copiedFromFile: "/file2.ts",
+    copiedTextRange: test.ranges(),
+    providePasteEdits: true,
+})

tests/cases/fourslash/preparePasteEdits_resolvedTypeParameters.ts

@@ -0,0 +1,19 @@
+/// <reference path='./fourslash.ts' />
+
+// @Filename: /file2.ts
+//// import { T } from './file1';
+////
+//// [|function MyFunction(param: T): T {
+////    type U = { value: T }
+////    const localVariable: U = { value: param };
+////    return localVariable.value;
+//// }|]
+
+// @Filename: /file1.ts
+//// export type T = string;
+
+verify.preparePasteEdits({
+    copiedFromFile: "/file2.ts",
+    copiedTextRange: test.ranges(),
+    providePasteEdits: true
+})

tests/cases/fourslash/preparePasteEdits_returnFalse.ts

@@ -0,0 +1,13 @@
+/// <reference path='./fourslash.ts' />
+
+// @Filename: /file1.ts
+//// [|const a = 1;|]
+//// [|function foo() {
+////     console.log("testing");}|]
+//// [|//This is a comment|]
+
+verify.preparePasteEdits({
+    copiedFromFile: "/file1.ts",
+    copiedTextRange: test.ranges(),
+    providePasteEdits: false,
+})