Swift package manifest refactoring actions

Package.swift

@@ -379,7 +379,7 @@ let package = Package(
 
     .testTarget(
       name: "SwiftRefactorTest",
-      dependencies: ["_SwiftSyntaxTestSupport", "SwiftRefactor"]
+      dependencies: ["_SwiftSyntaxTestSupport", "SwiftIDEUtils", "SwiftRefactor"]
     ),
 
     // MARK: - Deprecated targets

Sources/SwiftRefactor/CMakeLists.txt

@@ -21,6 +21,26 @@ add_swift_syntax_library(SwiftRefactor
   RefactoringProvider.swift
   RemoveSeparatorsFromIntegerLiteral.swift
   SyntaxUtils.swift
+
+  PackageManifest/AbsolutePath.swift
+  PackageManifest/AddPackageDependency.swift
+  PackageManifest/AddPackageTarget.swift
+  PackageManifest/AddPluginUsage.swift
+  PackageManifest/AddProduct.swift
+  PackageManifest/AddTargetDependency.swift
+  PackageManifest/ManifestEditError.swift
+  PackageManifest/ManifestEditRefactoringProvider.swift
+  PackageManifest/ManifestSyntaxRepresentable.swift
+  PackageManifest/PackageDependency.swift
+  PackageManifest/PackageEdit.swift
+  PackageManifest/PackageIdentity.swift
+  PackageManifest/ProductDescription.swift
+  PackageManifest/RelativePath.swift
+  PackageManifest/SemanticVersion.swift
+  PackageManifest/SourceControlURL.swift
+  PackageManifest/StringUtils.swift
+  PackageManifest/SyntaxEditUtils.swift
+  PackageManifest/Target.swift
 )
 
 target_link_swift_syntax_libraries(SwiftRefactor PUBLIC

Sources/SwiftRefactor/PackageManifest/AbsolutePath.swift

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+/// Syntactic wrapper type that describes an absolute path for refactoring
+/// purposes but does not interpret its contents.
+public struct AbsolutePath: CustomStringConvertible, Equatable, Hashable, Sendable {
+  public private(set) var description: String
+
+  public init(_ description: String) {
+    self.description = description
+  }
+}

Sources/SwiftRefactor/PackageManifest/AddPackageDependency.swift

@@ -0,0 +1,73 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) 2024 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftParser
+import SwiftSyntax
+import SwiftSyntaxBuilder
+
+/// Add a package dependency to a package manifest's source code.
+public struct AddPackageDependency: ManifestEditRefactoringProvider {
+  public struct Context {
+    public var dependency: PackageDependency
+
+    public init(dependency: PackageDependency) {
+      self.dependency = dependency
+    }
+  }
+
+  /// The set of argument labels that can occur after the "dependencies"
+  /// argument in the Package initializers.
+  ///
+  /// TODO: Could we generate this from the the PackageDescription module, so
+  /// we don't have keep it up-to-date manually?
+  private static let argumentLabelsAfterDependencies: Set<String> = [
+    "targets",
+    "swiftLanguageVersions",
+    "cLanguageStandard",
+    "cxxLanguageStandard",
+  ]
+
+  /// Produce the set of source edits needed to add the given package
+  /// dependency to the given manifest file.
+  public static func manifestRefactor(
+    syntax manifest: SourceFileSyntax,
+    in context: Context
+  ) throws -> PackageEdit {
+    let dependency = context.dependency
+    guard let packageCall = manifest.findCall(calleeName: "Package") else {
+      throw ManifestEditError.cannotFindPackage
+    }
+
+    let newPackageCall = try addPackageDependencyLocal(
+      dependency,
+      to: packageCall
+    )
+
+    return PackageEdit(
+      manifestEdits: [
+        .replace(packageCall, with: newPackageCall.description)
+      ]
+    )
+  }
+
+  /// Implementation of adding a package dependency to an existing call.
+  static func addPackageDependencyLocal(
+    _ dependency: PackageDependency,
+    to packageCall: FunctionCallExprSyntax
+  ) throws -> FunctionCallExprSyntax {
+    try packageCall.appendingToArrayArgument(
+      label: "dependencies",
+      trailingLabels: Self.argumentLabelsAfterDependencies,
+      newElement: dependency.asSyntax()
+    )
+  }
+}