Class SignatureHelpFeature

client/src/client.ts:1399–1442

}

class SignatureHelpFeature extends TextDocumentFeature<SignatureHelpRegistrationOptions> {

	constructor(client: BaseLanguageClient) {
		super(client, SignatureHelpRequest.type);
	}

	public fillClientCapabilities(capabilites: ClientCapabilities): void {
		let config = ensure(ensure(capabilites, 'textDocument')!, 'signatureHelp')!;
		config.dynamicRegistration = true;
		config.signatureInformation = { documentationFormat: [MarkupKind.Markdown, MarkupKind.PlainText] };
	}

	public initialize(capabilities: ServerCapabilities, documentSelector: DocumentSelector): void {
		if (!capabilities.signatureHelpProvider || !documentSelector) {
			return;
		}
		this.register(this.messages, {
			id: UUID.generateUuid(),
			registerOptions: Object.assign({}, { documentSelector: documentSelector }, capabilities.signatureHelpProvider)
		});
	}

	protected registerLanguageProvider(options: SignatureHelpRegistrationOptions): Disposable {
		let client = this._client;
		let providerSignatureHelp: ProvideSignatureHelpSignature = (document, position, token) => {
			return client.sendRequest(SignatureHelpRequest.type, client.code2ProtocolConverter.asTextDocumentPositionParams(document, position), token).then(
				client.protocol2CodeConverter.asSignatureHelp,
				(error) => {
					client.logFailedRequest(SignatureHelpRequest.type, error);
					return Promise.resolve(null);
				}
			);
		};
		let middleware = client.clientOptions.middleware!;
		let triggerCharacters = options.triggerCharacters || [];
		return Languages.registerSignatureHelpProvider(options.documentSelector!, {
			provideSignatureHelp: (document: TextDocument, position: VPosition, token: CancellationToken): ProviderResult<VSignatureHelp> => {
				return middleware.provideSignatureHelp
					? middleware.provideSignatureHelp(document, position, token, providerSignatureHelp)
					: providerSignatureHelp(document, position, token);
			}
		}, ...triggerCharacters);
	}
}

class DefinitionFeature extends TextDocumentFeature<TextDocumentRegistrationOptions> {