Add typeHierarchy/supertypes support (#25)

Co-authored-by: Erik Krietsch <ekrietsch@expediagroup.com>

Author: erikkrietsch

README.md

@@ -138,7 +138,7 @@ The LSP [specification](https://microsoft.github.io/language-server-protocol/spe
 | textDocument/willSave | ✅ |
 | textDocument/willSaveWaitUntil | ✅ |
 | typeHierarchy/subtypes | ✅ |
-| typeHierarchy/supertypes | - |
+| typeHierarchy/supertypes | ✅ |
 | window/logMessage | ✅ |
 | window/showDocument | ✅ |
 | window/showMessage | ✅ |

Sources/LanguageServerProtocol/Client/JSONRPCServerConnection.swift

@@ -185,6 +185,8 @@ public actor JSONRPCServerConnection: ServerConnection {
 			return try await session.response(to: method, params: params)
 		case .typeHierarchySubtypes(let params, _):
 			return try await session.response(to: method, params: params)
+		case .typeHierarchySupertypes(let params, _):
+			return try await session.response(to: method, params: params)
 		case let .custom(method, params, _):
 			return try await session.response(to: method, params: params)
 		}

Sources/LanguageServerProtocol/Client/ServerConnection.swift

@@ -725,4 +725,9 @@ extension ServerConnection {
 	public func typeHierarchySubtypes(_ params: TypeHierarchySubtypesParams) async throws -> TypeHierarchySubtypesResponse {
 		try await sendRequest(.typeHierarchySubtypes(params, ClientRequest.NullHandler))
 	}
+
+	public func typeHierarchySupertypes(_ params: TypeHierarchySupertypesParams) async throws -> TypeHierarchySupertypesResponse
+	{
+		try await sendRequest(.typeHierarchySupertypes(params, ClientRequest.NullHandler))
+	}
 }

Sources/LanguageServerProtocol/LanguageFeatures/TypeHeirarchy.swift

@@ -70,3 +70,20 @@ public struct TypeHierarchySubtypesParams: Codable, Hashable, Sendable {
 }
 
 public typealias TypeHierarchySubtypesResponse = [TypeHierarchyItem]?
+
+public struct TypeHierarchySupertypesParams: Codable, Hashable, Sendable {
+	public let workDoneToken: ProgressToken?
+	public let partialResultToken: ProgressToken?
+	public let item: TypeHierarchyItem
+
+	public init(
+		workDoneToken: ProgressToken? = nil, partialResultToken: ProgressToken? = nil,
+		item: TypeHierarchyItem
+	) {
+		self.workDoneToken = workDoneToken
+		self.partialResultToken = partialResultToken
+		self.item = item
+	}
+}
+
+public typealias TypeHierarchySupertypesResponse = [TypeHierarchyItem]?

Sources/LanguageServerProtocol/LanguageServerProtocol.swift

@@ -167,6 +167,7 @@ public enum ClientRequest: Sendable {
 		case callHierarchyIncomingCalls = "callHierarchy/incomingCalls"
 		case callHierarchyOutgoingCalls = "callHierarchy/outgoingCalls"
 		case typeHierarchySubtypes = "typeHierarchy/subtypes"
+		case typeHierarchySupertypes = "typeHierarchy/supertypes"
 		case custom
 	}
 
@@ -221,6 +222,8 @@ public enum ClientRequest: Sendable {
 	case callHierarchyOutgoingCalls(
 		CallHierarchyOutgoingCallsParams, Handler<CallHierarchyOutgoingCallsResponse>)
 	case typeHierarchySubtypes(TypeHierarchySubtypesParams, Handler<TypeHierarchySubtypesResponse>)
+	case typeHierarchySupertypes(
+		TypeHierarchySupertypesParams, Handler<TypeHierarchySupertypesResponse>)
 	case custom(String, LSPAny, Handler<LSPAny>)
 
 	public var method: Method {
@@ -323,6 +326,8 @@ public enum ClientRequest: Sendable {
 			return .callHierarchyOutgoingCalls
 		case .typeHierarchySubtypes:
 			return .typeHierarchySubtypes
+		case .typeHierarchySupertypes:
+			return .typeHierarchySupertypes
 		case .custom:
 			return .custom
 		}