watchpack.js
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Created: Mon, Nov 18, 09:20

watchpack.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/
	"use strict";

	const getWatcherManager = require("./getWatcherManager");
	const LinkResolver = require("./LinkResolver");
	const EventEmitter = require("events").EventEmitter;
	const globToRegExp = require("glob-to-regexp");
	const watchEventSource = require("./watchEventSource");

	let EXISTANCE_ONLY_TIME_ENTRY; // lazy required

	const EMPTY_ARRAY = [];
	const EMPTY_OPTIONS = {};

	function addWatchersToSet(watchers, set) {
	for (const w of watchers) {
	if (w !== true && !set.has(w.directoryWatcher)) {
	set.add(w.directoryWatcher);
	addWatchersToSet(w.directoryWatcher.directories.values(), set);
	}
	}
	}

	const stringToRegexp = ignored => {
	const source = globToRegExp(ignored, { globstar: true, extended: true })
	.source;
	const matchingStart = source.slice(0, source.length - 1) + "(?:$\|\\/)";
	return matchingStart;
	};

	const ignoredToRegexp = ignored => {
	if (Array.isArray(ignored)) {
	return new RegExp(ignored.map(i => stringToRegexp(i)).join("\|"));
	} else if (typeof ignored === "string") {
	return new RegExp(stringToRegexp(ignored));
	} else if (ignored instanceof RegExp) {
	return ignored;
	} else if (ignored) {
	throw new Error(`Invalid option for 'ignored': ${ignored}`);
	} else {
	return undefined;
	}
	};

	const normalizeOptions = options => {
	return {
	followSymlinks: !!options.followSymlinks,
	ignored: ignoredToRegexp(options.ignored),
	poll: options.poll
	};
	};

	const normalizeCache = new WeakMap();
	const cachedNormalizeOptions = options => {
	const cacheEntry = normalizeCache.get(options);
	if (cacheEntry !== undefined) return cacheEntry;
	const normalized = normalizeOptions(options);
	normalizeCache.set(options, normalized);
	return normalized;
	};

	class Watchpack extends EventEmitter {
	constructor(options) {
	super();
	if (!options) options = EMPTY_OPTIONS;
	this.options = options;
	this.aggregateTimeout =
	typeof options.aggregateTimeout === "number"
	? options.aggregateTimeout
	: 200;
	this.watcherOptions = cachedNormalizeOptions(options);
	this.watcherManager = getWatcherManager(this.watcherOptions);
	this.fileWatchers = new Map();
	this.directoryWatchers = new Map();
	this.startTime = undefined;
	this.paused = false;
	this.aggregatedChanges = new Set();
	this.aggregatedRemovals = new Set();
	this.aggregateTimer = undefined;
	this._onTimeout = this._onTimeout.bind(this);
	}

	watch(arg1, arg2, arg3) {
	let files, directories, missing, startTime;
	if (!arg2) {
	({
	files = EMPTY_ARRAY,
	directories = EMPTY_ARRAY,
	missing = EMPTY_ARRAY,
	startTime
	} = arg1);
	} else {
	files = arg1;
	directories = arg2;
	missing = EMPTY_ARRAY;
	startTime = arg3;
	}
	this.paused = false;
	const oldFileWatchers = this.fileWatchers;
	const oldDirectoryWatchers = this.directoryWatchers;
	const ignored = this.watcherOptions.ignored;
	const filter = ignored
	? path => !ignored.test(path.replace(/\\/g, "/"))
	: () => true;
	const addToMap = (map, key, item) => {
	const list = map.get(key);
	if (list === undefined) {
	map.set(key, [item]);
	} else {
	list.push(item);
	}
	};
	const fileWatchersNeeded = new Map();
	const directoryWatchersNeeded = new Map();
	const missingFiles = new Set();
	if (this.watcherOptions.followSymlinks) {
	const resolver = new LinkResolver();
	for (const file of files) {
	if (filter(file)) {
	for (const innerFile of resolver.resolve(file)) {
	if (file === innerFile \|\| filter(innerFile)) {
	addToMap(fileWatchersNeeded, innerFile, file);
	}
	}
	}
	}
	for (const file of missing) {
	if (filter(file)) {
	for (const innerFile of resolver.resolve(file)) {
	if (file === innerFile \|\| filter(innerFile)) {
	missingFiles.add(file);
	addToMap(fileWatchersNeeded, innerFile, file);
	}
	}
	}
	}
	for (const dir of directories) {
	if (filter(dir)) {
	let first = true;
	for (const innerItem of resolver.resolve(dir)) {
	if (filter(innerItem)) {
	addToMap(
	first ? directoryWatchersNeeded : fileWatchersNeeded,
	innerItem,
	dir
	);
	}
	first = false;
	}
	}
	}
	} else {
	for (const file of files) {
	if (filter(file)) {
	addToMap(fileWatchersNeeded, file, file);
	}
	}
	for (const file of missing) {
	if (filter(file)) {
	missingFiles.add(file);
	addToMap(fileWatchersNeeded, file, file);
	}
	}
	for (const dir of directories) {
	if (filter(dir)) {
	addToMap(directoryWatchersNeeded, dir, dir);
	}
	}
	}
	const newFileWatchers = new Map();
	const newDirectoryWatchers = new Map();
	const setupFileWatcher = (watcher, key, files) => {
	watcher.on("initial-missing", type => {
	for (const file of files) {
	if (!missingFiles.has(file)) this._onRemove(file, file, type);
	}
	});
	watcher.on("change", (mtime, type) => {
	for (const file of files) {
	this._onChange(file, mtime, file, type);
	}
	});
	watcher.on("remove", type => {
	for (const file of files) {
	this._onRemove(file, file, type);
	}
	});
	newFileWatchers.set(key, watcher);
	};
	const setupDirectoryWatcher = (watcher, key, directories) => {
	watcher.on("initial-missing", type => {
	for (const item of directories) {
	this._onRemove(item, item, type);
	}
	});
	watcher.on("change", (file, mtime, type) => {
	for (const item of directories) {
	this._onChange(item, mtime, file, type);
	}
	});
	watcher.on("remove", type => {
	for (const item of directories) {
	this._onRemove(item, item, type);
	}
	});
	newDirectoryWatchers.set(key, watcher);
	};
	// Close unneeded old watchers
	const fileWatchersToClose = [];
	const directoryWatchersToClose = [];
	for (const [key, w] of oldFileWatchers) {
	if (!fileWatchersNeeded.has(key)) {
	w.close();
	} else {
	fileWatchersToClose.push(w);
	}
	}
	for (const [key, w] of oldDirectoryWatchers) {
	if (!directoryWatchersNeeded.has(key)) {
	w.close();
	} else {
	directoryWatchersToClose.push(w);
	}
	}
	// Create new watchers and install handlers on these watchers
	watchEventSource.batch(() => {
	for (const [key, files] of fileWatchersNeeded) {
	const watcher = this.watcherManager.watchFile(key, startTime);
	if (watcher) {
	setupFileWatcher(watcher, key, files);
	}
	}
	for (const [key, directories] of directoryWatchersNeeded) {
	const watcher = this.watcherManager.watchDirectory(key, startTime);
	if (watcher) {
	setupDirectoryWatcher(watcher, key, directories);
	}
	}
	});
	// Close old watchers
	for (const w of fileWatchersToClose) w.close();
	for (const w of directoryWatchersToClose) w.close();
	// Store watchers
	this.fileWatchers = newFileWatchers;
	this.directoryWatchers = newDirectoryWatchers;
	this.startTime = startTime;
	}

	close() {
	this.paused = true;
	if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
	for (const w of this.fileWatchers.values()) w.close();
	for (const w of this.directoryWatchers.values()) w.close();
	this.fileWatchers.clear();
	this.directoryWatchers.clear();
	}

	pause() {
	this.paused = true;
	if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
	}

	getTimes() {
	const directoryWatchers = new Set();
	addWatchersToSet(this.fileWatchers.values(), directoryWatchers);
	addWatchersToSet(this.directoryWatchers.values(), directoryWatchers);
	const obj = Object.create(null);
	for (const w of directoryWatchers) {
	const times = w.getTimes();
	for (const file of Object.keys(times)) obj[file] = times[file];
	}
	return obj;
	}

	getTimeInfoEntries() {
	if (EXISTANCE_ONLY_TIME_ENTRY === undefined) {
	EXISTANCE_ONLY_TIME_ENTRY = require("./DirectoryWatcher")
	.EXISTANCE_ONLY_TIME_ENTRY;
	}
	const directoryWatchers = new Set();
	addWatchersToSet(this.fileWatchers.values(), directoryWatchers);
	addWatchersToSet(this.directoryWatchers.values(), directoryWatchers);
	const map = new Map();
	for (const w of directoryWatchers) {
	const times = w.getTimeInfoEntries();
	for (const [path, entry] of times) {
	if (map.has(path)) {
	if (entry === EXISTANCE_ONLY_TIME_ENTRY) continue;
	const value = map.get(path);
	if (value === entry) continue;
	if (value !== EXISTANCE_ONLY_TIME_ENTRY) {
	map.set(path, Object.assign({}, value, entry));
	continue;
	}
	}
	map.set(path, entry);
	}
	}
	return map;
	}

	_onChange(item, mtime, file, type) {
	file = file \|\| item;
	if (this.paused) return;
	this.emit("change", file, mtime, type);
	if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
	this.aggregatedRemovals.delete(item);
	this.aggregatedChanges.add(item);
	this.aggregateTimer = setTimeout(this._onTimeout, this.aggregateTimeout);
	}

	_onRemove(item, file, type) {
	file = file \|\| item;
	if (this.paused) return;
	this.emit("remove", file, type);
	if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
	this.aggregatedChanges.delete(item);
	this.aggregatedRemovals.add(item);
	this.aggregateTimer = setTimeout(this._onTimeout, this.aggregateTimeout);
	}

	_onTimeout() {
	this.aggregateTimer = undefined;
	const changes = this.aggregatedChanges;
	const removals = this.aggregatedRemovals;
	this.aggregatedChanges = new Set();
	this.aggregatedRemovals = new Set();
	this.emit("aggregated", changes, removals);
	}
	}

	module.exports = Watchpack;

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watchpack.js
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watchpack.js
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