Move SendableExtensionMacro from ExamplePlugin to MacroExamples target

Author: Matejkob

Examples/Sources/MacroExamples/Implementation/Extension/SendableExtensionMacro.swift

@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2023 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
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftSyntax
+import SwiftSyntaxMacros
+
+public enum SendableExtensionMacro: ExtensionMacro {
+  public static func expansion(
+    of node: AttributeSyntax,
+    attachedTo declaration: some DeclGroupSyntax,
+    providingExtensionsOf type: some TypeSyntaxProtocol,
+    conformingTo protocols: [TypeSyntax],
+    in context: some MacroExpansionContext
+  ) throws -> [ExtensionDeclSyntax] {
+    if protocols.isEmpty {
+      return []
+    }
+
+    let sendableExtension: DeclSyntax =
+      """
+      extension \(type.trimmed): Sendable {}
+      """
+
+    guard let extensionDecl = sendableExtension.as(ExtensionDeclSyntax.self) else {
+      return []
+    }
+
+    return [extensionDecl]
+  }
+}

Examples/Sources/MacroExamples/Implementation/Plugin.swift

@@ -41,6 +41,7 @@ struct MyPlugin: CompilerPlugin {
     PeerValueWithSuffixNameMacro.self,
     MemberDeprecatedMacro.self,
     EquatableConformanceMacro.self,
+    SendableExtensionMacro.self,
   ]
 }
 #endif

Examples/Sources/MacroExamples/Interface/ExtensionMacros.swift

@@ -14,3 +14,8 @@
 
 @attached(extension, conformances: Equatable)
 public macro equatable() = #externalMacro(module: "MacroExamplesImplementation", type: "EquatableConformanceMacro")
+
+// MARK: - Sendable Extension
+
+@attached(extension, conformances: Sendable)
+public macro sendable() = #externalMacro(module: "MacroExamplesImplementation", type: "SendableExtensionMacro")

Examples/Sources/MacroExamples/Playground/ExtensionMacrosPlayground.swift

@@ -26,3 +26,27 @@ func runEquatableConformanceMacroPlayground() {
 
   print("Is Tom different form Jerry?", cat == mouse ? "No" : "Yes")
 }
+
+// MARK: - Sendable Conformance
+
+@sendable
+final class Message {
+  let text: String
+  let sender: String
+
+  init(text: String, sender: String) {
+    self.text = text
+    self.sender = sender
+  }
+}
+
+func runSendableConformanceMacroPlayground() async {
+  let message = Message(text: "Hello, World!", sender: "Alice")
+
+  // Example using Task to demonstrate Sendable conformance
+  let newMessage = await Task {
+    message
+  }.value
+
+  print("Successfully transferred message from:", newMessage.sender)
+}

Examples/Sources/MacroExamples/Playground/main.swift

@@ -33,6 +33,7 @@ runExpressionMacrosPlayground()
 // MARK: - Extension Macros
 
 runEquatableConformanceMacroPlayground()
+await runSendableConformanceMacroPlayground()
 
 // MARK: - Member Attribute Macros
 

Examples/Tests/MacroExamples/Implementation/Extension/SendableExtensionMacroTests.swift

@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2023 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
+//
+//===----------------------------------------------------------------------===//
+
+import MacroExamplesImplementation
+import SwiftSyntaxMacros
+import SwiftSyntaxMacrosTestSupport
+import XCTest
+
+// FIXME: Uncomment when https://github.com/apple/swift-syntax/issues/2031 is fixed
+/*
+final class SendableExtensionMacroTests: XCTestCase {
+  private let macros = ["sendable": SendableExtensionMacro.self]
+
+  func testExpansionAddsSendableConformance() {
+    assertMacroExpansion(
+      """
+      @sendable
+      final class Message {
+        let text: String
+        let sender: String
+
+        init(text: String, sender: String) {
+          self.text = text
+          self.sender = sender
+        }
+      }
+      """,
+      expandedSource: """
+        final public class Message {
+          let text: String
+          let sender: String
+        }
+
+        extension Message: Sendable {
+        }
+        """,
+      macros: macros,
+      indentationWidth: .spaces(2)
+    )
+  }
+}
+*/