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https://github.com/Microsoft/vscode
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271 lines
8.5 KiB
JavaScript
271 lines
8.5 KiB
JavaScript
/*---------------------------------------------------------------------------------------------
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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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// @ts-check
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/// <reference path='debugger-scripts-api.d.ts' />
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const path = require('path');
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const fsPromise = require('fs/promises');
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const parcelWatcher = require('@parcel/watcher');
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// This file is loaded by the vscode-diagnostic-tools extension and injected into the debugger.
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/** @type {RunFunction} */
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module.exports.run = async function (debugSession) {
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const watcher = await DirWatcher.watchRecursively(path.join(__dirname, '../out/'));
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const sub = watcher.onDidChange(changes => {
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const supportedChanges = changes.filter(c => c.path.endsWith('.js') || c.path.endsWith('.css'));
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debugSession.evalJs(function (changes, debugSessionName) {
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// This function is stringified and injected into the debuggee.
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/** @type {{ count: number; originalWindowTitle: any; timeout: any; shouldReload: boolean }} */
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const hotReloadData = globalThis.$hotReloadData || (globalThis.$hotReloadData = { count: 0, messageHideTimeout: undefined, shouldReload: false });
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/**
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* @param {string} path
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* @param {string} newSrc
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*/
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function handleChange(path, newSrc) {
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const relativePath = path.replace(/\\/g, '/').split('/out/')[1];
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if (relativePath.endsWith('.css')) {
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handleCssChange(relativePath);
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} else if (relativePath.endsWith('.js')) {
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handleJsChange(relativePath, newSrc);
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}
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}
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/**
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* @param {string} relativePath
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*/
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function handleCssChange(relativePath) {
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if (typeof document === 'undefined') {
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return;
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}
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const styleSheet = (/** @type {HTMLLinkElement[]} */ ([...document.querySelectorAll(`link[rel='stylesheet']`)]))
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.find(l => new URL(l.href, document.location.href).pathname.endsWith(relativePath));
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if (styleSheet) {
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setMessage(`reload ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
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console.log(debugSessionName, 'css reloaded', relativePath);
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styleSheet.href = styleSheet.href.replace(/\?.*/, '') + '?' + Date.now();
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} else {
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setMessage(`could not reload ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
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console.log(debugSessionName, 'ignoring css change, as stylesheet is not loaded', relativePath);
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}
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}
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/**
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* @param {string} relativePath
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* @param {string} newSrc
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*/
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function handleJsChange(relativePath, newSrc) {
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const moduleIdStr = trimEnd(relativePath, '.js');
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/** @type {any} */
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const requireFn = globalThis.require;
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const moduleManager = requireFn.moduleManager;
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if (!moduleManager) {
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console.log(debugSessionName, 'ignoring js change, as moduleManager is not available', relativePath);
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return;
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}
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const moduleId = moduleManager._moduleIdProvider.getModuleId(moduleIdStr);
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const oldModule = moduleManager._modules2[moduleId];
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if (!oldModule) {
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console.log(debugSessionName, 'ignoring js change, as module is not loaded', relativePath);
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return;
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}
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// Check if we can reload
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const g = /** @type {GlobalThisAddition} */ (globalThis);
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// A frozen copy of the previous exports
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const oldExports = Object.freeze({ ...oldModule.exports });
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const reloadFn = g.$hotReload_applyNewExports?.({ oldExports, newSrc });
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if (!reloadFn) {
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console.log(debugSessionName, 'ignoring js change, as module does not support hot-reload', relativePath);
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hotReloadData.shouldReload = true;
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setMessage(`hot reload not supported for ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
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return;
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}
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// Eval maintains source maps
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function newScript(/* this parameter is used by newSrc */ define) {
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// eslint-disable-next-line no-eval
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eval(newSrc); // CodeQL [SM01632] This code is only executed during development. It is required for the hot-reload functionality.
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}
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newScript(/* define */ function (deps, callback) {
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// Evaluating the new code was successful.
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// Redefine the module
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delete moduleManager._modules2[moduleId];
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moduleManager.defineModule(moduleIdStr, deps, callback);
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const newModule = moduleManager._modules2[moduleId];
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// Patch the exports of the old module, so that modules using the old module get the new exports
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Object.assign(oldModule.exports, newModule.exports);
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// We override the exports so that future reloads still patch the initial exports.
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newModule.exports = oldModule.exports;
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const successful = reloadFn(newModule.exports);
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if (!successful) {
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hotReloadData.shouldReload = true;
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setMessage(`hot reload failed ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
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console.log(debugSessionName, 'hot reload was not successful', relativePath);
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return;
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}
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console.log(debugSessionName, 'hot reloaded', moduleIdStr);
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setMessage(`successfully reloaded ${formatPath(relativePath)} - ${new Date().toLocaleTimeString()}`);
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});
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}
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/**
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* @param {string} message
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*/
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function setMessage(message) {
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const domElem = /** @type {HTMLDivElement | undefined} */ (document.querySelector('.titlebar-center .window-title'));
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if (!domElem) { return; }
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if (!hotReloadData.timeout) {
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hotReloadData.originalWindowTitle = domElem.innerText;
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} else {
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clearTimeout(hotReloadData.timeout);
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}
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if (hotReloadData.shouldReload) {
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message += ' (manual reload required)';
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}
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domElem.innerText = message;
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hotReloadData.timeout = setTimeout(() => {
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hotReloadData.timeout = undefined;
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// If wanted, we can restore the previous title message
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// domElem.replaceChildren(hotReloadData.originalWindowTitle);
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}, 5000);
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}
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/**
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* @param {string} path
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* @returns {string}
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*/
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function formatPath(path) {
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const parts = path.split('/');
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parts.reverse();
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let result = parts[0];
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parts.shift();
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for (const p of parts) {
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if (result.length + p.length > 40) {
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break;
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}
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result = p + '/' + result;
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if (result.length > 20) {
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break;
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}
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}
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return result;
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}
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function trimEnd(str, suffix) {
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if (str.endsWith(suffix)) {
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return str.substring(0, str.length - suffix.length);
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}
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return str;
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}
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for (const change of changes) {
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handleChange(change.path, change.newContent);
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}
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}, supportedChanges, debugSession.name.substring(0, 25));
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});
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return {
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dispose() {
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sub.dispose();
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watcher.dispose();
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}
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};
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};
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class DirWatcher {
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/**
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*
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* @param {string} dir
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* @returns {Promise<DirWatcher>}
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*/
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static async watchRecursively(dir) {
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/** @type {((changes: { path: string, newContent: string }[]) => void)[]} */
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const listeners = [];
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/** @type {Map<string, string> } */
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const fileContents = new Map();
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/** @type {Map<string, { path: string, newContent: string }>} */
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const changes = new Map();
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/** @type {(handler: (changes: { path: string, newContent: string }[]) => void) => IDisposable} */
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const event = (handler) => {
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listeners.push(handler);
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return {
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dispose: () => {
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const idx = listeners.indexOf(handler);
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if (idx >= 0) {
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listeners.splice(idx, 1);
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}
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}
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};
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};
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const r = parcelWatcher.subscribe(dir, async (err, events) => {
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for (const e of events) {
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if (e.type === 'update') {
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const newContent = await fsPromise.readFile(e.path, 'utf8');
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if (fileContents.get(e.path) !== newContent) {
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fileContents.set(e.path, newContent);
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changes.set(e.path, { path: e.path, newContent });
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}
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}
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}
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if (changes.size > 0) {
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debounce(() => {
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const uniqueChanges = Array.from(changes.values());
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changes.clear();
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listeners.forEach(l => l(uniqueChanges));
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})();
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}
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});
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const result = await r;
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return new DirWatcher(event, () => result.unsubscribe());
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}
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/**
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* @param {(handler: (changes: { path: string, newContent: string }[]) => void) => IDisposable} onDidChange
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* @param {() => void} unsub
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*/
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constructor(onDidChange, unsub) {
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this.onDidChange = onDidChange;
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this.unsub = unsub;
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}
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dispose() {
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this.unsub();
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}
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}
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/**
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* Debounce function calls
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* @param {() => void} fn
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* @param {number} delay
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*/
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function debounce(fn, delay = 50) {
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let timeoutId;
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return function (...args) {
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clearTimeout(timeoutId);
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timeoutId = setTimeout(() => {
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fn.apply(this, args);
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}, delay);
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};
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}
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