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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;
}
getAggregated() {
if (this.aggregateTimer) {
clearTimeout(this.aggregateTimer);
this.aggregateTimer = undefined;
}
const changes = this.aggregatedChanges;
const removals = this.aggregatedRemovals;
this.aggregatedChanges = new Set();
this.aggregatedRemovals = new Set();
return { changes, removals };
}
_onChange(item, mtime, file, type) {
file = file || item;
if (!this.paused) {
this.emit("change", file, mtime, type);
if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
this.aggregateTimer = setTimeout(this._onTimeout, this.aggregateTimeout);
}
this.aggregatedRemovals.delete(item);
this.aggregatedChanges.add(item);
}
_onRemove(item, file, type) {
file = file || item;
if (!this.paused) {
this.emit("remove", file, type);
if (this.aggregateTimer) clearTimeout(this.aggregateTimer);
this.aggregateTimer = setTimeout(this._onTimeout, this.aggregateTimeout);
}
this.aggregatedChanges.delete(item);
this.aggregatedRemovals.add(item);
}
_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;