export function getCodeActions(
	model: ITextModel,
	rangeOrSelection: Range | Selection,
	trigger: CodeActionTrigger,
	token: CancellationToken
): Promise<CodeActionSet> {
	const filter = trigger.filter || {};

	const codeActionContext: CodeActionContext = {
		only: filter.kind ? filter.kind.value : undefined,
		trigger: trigger.type === 'manual' ? CodeActionTriggerKind.Manual : CodeActionTriggerKind.Automatic
	};

	const chainedCancellation = new CancellationTokenSource();
	token.onCancellationRequested(() => chainedCancellation.cancel());

	const providers = getCodeActionProviders(model, filter);

	const promises = providers.map(provider => {
		return Promise.resolve(provider.provideCodeActions(model, rangeOrSelection, codeActionContext, chainedCancellation.token)).then(providedCodeActions => {
			if (!Array.isArray(providedCodeActions)) {
				return [];
			}
			return providedCodeActions.filter(action => action && filtersAction(filter, action));
		}, (err): CodeAction[] => {
			if (isPromiseCanceledError(err)) {
				throw err;
			}

			onUnexpectedExternalError(err);
			return [];
		});
	});

	const listener = CodeActionProviderRegistry.onDidChange(() => {
		const newProviders = CodeActionProviderRegistry.all(model);
		if (!equals(newProviders, providers)) {
			chainedCancellation.cancel();
		}
	});

	return Promise.all(promises)
		.then(flatten)
		.then(actions => new CodeActionSet(actions))
		.finally(() => {
			listener.dispose();
		});
}

		return new Promise<IRequestContext>((c, e) => {
			const endpoint = parseUrl(options.url!);

			const opts: https.RequestOptions = {
				hostname: endpoint.hostname,
				port: endpoint.port ? parseInt(endpoint.port) : (endpoint.protocol === 'https:' ? 443 : 80),
				protocol: endpoint.protocol,
				path: endpoint.path,
				method: options.type || 'GET',
				headers: options.headers,
				agent: options.agent,
				rejectUnauthorized: isBoolean(options.strictSSL) ? options.strictSSL : true
			};

			if (options.user && options.password) {
				opts.auth = options.user + ':' + options.password;
			}

			req = rawRequest(opts, (res: http.IncomingMessage) => {
				const followRedirects: number = isNumber(options.followRedirects) ? options.followRedirects : 3;
				if (res.statusCode && res.statusCode >= 300 && res.statusCode < 400 && followRedirects > 0 && res.headers['location']) {
					request(assign({}, options, {
						url: res.headers['location'],
						followRedirects: followRedirects - 1
					}), token).then(c, e);
				} else {
					let stream: Stream = res;

					if (res.headers['content-encoding'] === 'gzip') {
						stream = stream.pipe(createGunzip());
					}

					c({ res, stream } as IRequestContext);
				}
			});

			req.on('error', e);

			if (options.timeout) {
				req.setTimeout(options.timeout);
			}

			if (options.data) {
				if (typeof options.data === 'string') {
					req.write(options.data);
				} else {
					options.data.pipe(req);
					return;
				}
			}

			req.end();

			token.onCancellationRequested(() => {
				req.abort();
				e(canceled());
			});
		});

	return new Promise<IRequestContext>((resolve, reject) => {

		xhr.open(options.type || 'GET', options.url || '', true, options.user, options.password);
		setRequestHeaders(xhr, options);

		xhr.responseType = 'arraybuffer';
		xhr.onerror = e => reject(new Error(xhr.statusText && ('XHR failed: ' + xhr.statusText)));
		xhr.onload = (e) => {
			resolve({
				res: {
					statusCode: xhr.status,
					headers: getResponseHeaders(xhr)
				},
				stream: new class ArrayBufferStream extends Readable {

					private _buffer: Buffer;
					private _offset: number;
					private _length: number;

					constructor(arraybuffer: ArrayBuffer) {
						super();
						this._buffer = Buffer.from(new Uint8Array(arraybuffer));
						this._offset = 0;
						this._length = this._buffer.length;
					}

					_read(size: number) {
						if (this._offset < this._length) {
							this.push(this._buffer.slice(this._offset, (this._offset + size)));
							this._offset += size;
						} else {
							this.push(null);
						}
					}

				}(xhr.response)
			});
		};
		xhr.ontimeout = e => reject(new Error(`XHR timeout: ${options.timeout}ms`));

		if (options.timeout) {
			xhr.timeout = options.timeout;
		}

		// TODO: remove any
		xhr.send(options.data as any);

		// cancel
		token.onCancellationRequested(() => {
			xhr.abort();
			reject(canceled());
		});
	});