new feature to move methods and fields between types

Sources/SwiftLanguageService/CodeActions/MoveMember.swift

@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2026 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+@_spi(SourceKitLSP) import LanguageServerProtocol
+import SourceKitLSP
+import SwiftSyntax
+
+extension CodeActionKind {
+  static let refactorMove = CodeActionKind(rawValue: "refactor.move")
+}
+
+struct MoveMember: SyntaxCodeActionProvider {
+
+  static func codeActions(in scope: SyntaxCodeActionScope) -> [CodeAction] {
+
+    guard
+      let member =
+        scope.innermostNodeContainingRange?
+        .findParentOfSelf(
+          ofType: MemberBlockItemSyntax.self,
+          stoppingIf: { $0.is(SourceFileSyntax.self) }
+        )
+    else {
+      return []
+    }
+
+    return [
+      CodeAction(
+        title: "Move to another type",
+        kind: .refactorMove,
+        command: Command(
+          title: "Move to another type",
+          command: "swift.moveMember",
+          arguments: [
+            .string(scope.snapshot.uri.stringValue),
+            .int(member.position.utf8Offset),
+            .int(member.endPosition.utf8Offset),
+          ]
+        )
+      )
+    ]
+  }
+}

Sources/SwiftLanguageService/CodeActions/SyntaxCodeActions.swift

@@ -29,6 +29,7 @@ let allSyntaxCodeActions: [any SyntaxCodeActionProvider.Type] = {
     MigrateToNewIfLetSyntax.self,
     OpaqueParameterToGeneric.self,
     RemoveSeparatorsFromIntegerLiteral.self,
+    MoveMember.self,
   ]
   #if !NO_SWIFTPM_DEPENDENCY
   result.append(PackageManifestEdits.self)

Tests/SourceKitLSPTests/CodeActionTests.swift

@@ -1637,6 +1637,45 @@ final class CodeActionTests: SourceKitLSPTestCase {
       []
     }
   }
+
+  func testMoveMemberCodeAction() async throws {
+    let testClient = try await TestSourceKitLSPClient(capabilities: clientCapabilitiesWithCodeActionSupport)
+    let uri = DocumentURI(for: .swift)
+    let positions = testClient.openDocument(
+      """
+      struct MyStruct {
+        1️⃣func myFunction() {}
+      }
+      """,
+      uri: uri
+    )
+
+    let request = CodeActionRequest(
+      range: Range(positions["1️⃣"]),
+      context: .init(),
+      textDocument: TextDocumentIdentifier(uri)
+    )
+    let result = try await testClient.send(request)
+
+    // Make sure we get a "Move to another type" action.
+    let moveMemberAction = result?.codeActions?.first { action in
+      return action.title == "Move to another type"
+    }
+    XCTAssertNotNil(moveMemberAction)
+  }
+
+  func testMoveMemberCodeActionNotOfferedForTopLevelCode() async throws {
+    try await assertCodeActions(
+      """
+      1️⃣func topLevelFunction() {}
+      """,
+      markers: ["1️⃣"],
+      exhaustive: false
+    ) { _, _ in
+      []
+    }
+  }
+
   func testConvertComputedPropertyToZeroParameterFunction() async throws {
     let testClient = try await TestSourceKitLSPClient(capabilities: clientCapabilitiesWithCodeActionSupport)
     let uri = DocumentURI(for: .swift)