@pkerschbaum/code-oss-file-service
Version:
VS Code ([microsoft/vscode](https://github.com/microsoft/vscode)) includes a rich "`FileService`" and "`DiskFileSystemProvider`" abstraction built on top of Node.js core modules (`fs`, `path`) and Electron's `shell` module. This package allows to use that
117 lines • 4.58 kB
JavaScript
;
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.throttle = exports.debounce = exports.memoize = exports.createDecorator = void 0;
function createDecorator(mapFn) {
return (target, key, descriptor) => {
let fnKey = null;
let fn = null;
if (typeof descriptor.value === 'function') {
fnKey = 'value';
fn = descriptor.value;
}
else if (typeof descriptor.get === 'function') {
fnKey = 'get';
fn = descriptor.get;
}
if (!fn) {
throw new Error('not supported');
}
descriptor[fnKey] = mapFn(fn, key);
};
}
exports.createDecorator = createDecorator;
function memoize(_target, key, descriptor) {
let fnKey = null;
let fn = null;
if (typeof descriptor.value === 'function') {
fnKey = 'value';
fn = descriptor.value;
if (fn.length !== 0) {
console.warn('Memoize should only be used in functions with zero parameters');
}
}
else if (typeof descriptor.get === 'function') {
fnKey = 'get';
fn = descriptor.get;
}
if (!fn) {
throw new Error('not supported');
}
const memoizeKey = `$memoize$${key}`;
descriptor[fnKey] = function (...args) {
if (!this.hasOwnProperty(memoizeKey)) {
Object.defineProperty(this, memoizeKey, {
configurable: false,
enumerable: false,
writable: false,
value: fn.apply(this, args)
});
}
return this[memoizeKey];
};
}
exports.memoize = memoize;
function debounce(delay, reducer, initialValueProvider) {
return createDecorator((fn, key) => {
const timerKey = `$debounce$${key}`;
const resultKey = `$debounce$result$${key}`;
return function (...args) {
if (!this[resultKey]) {
this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
}
clearTimeout(this[timerKey]);
if (reducer) {
this[resultKey] = reducer(this[resultKey], ...args);
args = [this[resultKey]];
}
this[timerKey] = setTimeout(() => {
fn.apply(this, args);
this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
}, delay);
};
});
}
exports.debounce = debounce;
function throttle(delay, reducer, initialValueProvider) {
return createDecorator((fn, key) => {
const timerKey = `$throttle$timer$${key}`;
const resultKey = `$throttle$result$${key}`;
const lastRunKey = `$throttle$lastRun$${key}`;
const pendingKey = `$throttle$pending$${key}`;
return function (...args) {
if (!this[resultKey]) {
this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
}
if (this[lastRunKey] === null || this[lastRunKey] === undefined) {
this[lastRunKey] = -Number.MAX_VALUE;
}
if (reducer) {
this[resultKey] = reducer(this[resultKey], ...args);
}
if (this[pendingKey]) {
return;
}
const nextTime = this[lastRunKey] + delay;
if (nextTime <= Date.now()) {
this[lastRunKey] = Date.now();
fn.apply(this, [this[resultKey]]);
this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
}
else {
this[pendingKey] = true;
this[timerKey] = setTimeout(() => {
this[pendingKey] = false;
this[lastRunKey] = Date.now();
fn.apply(this, [this[resultKey]]);
this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
}, nextTime - Date.now());
}
};
});
}
exports.throttle = throttle;
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