74 lines
2.1 KiB
TypeScript
74 lines
2.1 KiB
TypeScript
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { Event, Disposable } from 'vscode';
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export function filterEvent<T>(event: Event<T>, filter: (e: T) => boolean): Event<T> {
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return (listener, thisArgs = null, disposables?) => event(e => filter(e) && listener.call(thisArgs, e), null, disposables);
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}
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export function onceEvent<T>(event: Event<T>): Event<T> {
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return (listener, thisArgs = null, disposables?) => {
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const result = event(e => {
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result.dispose();
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return listener.call(thisArgs, e);
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}, null, disposables);
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return result;
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};
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}
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export interface PromiseAdapter<T, U> {
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(
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value: T,
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resolve:
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(value: U | PromiseLike<U>) => void,
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reject:
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(reason: any) => void
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): any;
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}
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const passthrough = (value: any, resolve: (value?: any) => void) => resolve(value);
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/**
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* Return a promise that resolves with the next emitted event, or with some future
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* event as decided by an adapter.
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*
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* If specified, the adapter is a function that will be called with
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* `(event, resolve, reject)`. It will be called once per event until it resolves or
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* rejects.
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*
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* The default adapter is the passthrough function `(value, resolve) => resolve(value)`.
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*
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* @param event the event
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* @param adapter controls resolution of the returned promise
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* @returns a promise that resolves or rejects as specified by the adapter
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*/
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export async function promiseFromEvent<T, U>(
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event: Event<T>,
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adapter: PromiseAdapter<T, U> = passthrough): Promise<U> {
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let subscription: Disposable;
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return new Promise<U>((resolve, reject) =>
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subscription = event((value: T) => {
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try {
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Promise.resolve(adapter(value, resolve, reject))
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.catch(reject);
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} catch (error) {
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reject(error);
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}
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})
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).then(
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(result: U) => {
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subscription.dispose();
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return result;
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},
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error => {
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subscription.dispose();
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throw error;
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}
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);
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}
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