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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Stats = require("./Stats");
class Watching {
constructor(compiler, watchOptions, handler) {
this.startTime = null;
this.invalid = false;
this.handler = handler;
this.callbacks = [];
this.closed = false;
this.suspended = false;
if (typeof watchOptions === "number") {
this.watchOptions = {
aggregateTimeout: watchOptions
};
} else if (watchOptions && typeof watchOptions === "object") {
this.watchOptions = Object.assign({}, watchOptions);
} else {
this.watchOptions = {};
}
this.watchOptions.aggregateTimeout =
this.watchOptions.aggregateTimeout || 200;
this.compiler = compiler;
this.running = true;
this.compiler.readRecords(err => {
if (err) return this._done(err);
this._go();
});
}
_go() {
this.startTime = Date.now();
this.running = true;
this.invalid = false;
this.compiler.hooks.watchRun.callAsync(this.compiler, err => {
if (err) return this._done(err);
const onCompiled = (err, compilation) => {
if (err) return this._done(err);
if (this.invalid) return this._done();
if (this.compiler.hooks.shouldEmit.call(compilation) === false) {
return this._done(null, compilation);
}
this.compiler.emitAssets(compilation, err => {
if (err) return this._done(err);
if (this.invalid) return this._done();
this.compiler.emitRecords(err => {
if (err) return this._done(err);
if (compilation.hooks.needAdditionalPass.call()) {
compilation.needAdditionalPass = true;
const stats = new Stats(compilation);
stats.startTime = this.startTime;
stats.endTime = Date.now();
this.compiler.hooks.done.callAsync(stats, err => {
if (err) return this._done(err);
this.compiler.hooks.additionalPass.callAsync(err => {
if (err) return this._done(err);
this.compiler.compile(onCompiled);
});
});
return;
}
return this._done(null, compilation);
});
});
};
this.compiler.compile(onCompiled);
});
}
_getStats(compilation) {
const stats = new Stats(compilation);
stats.startTime = this.startTime;
stats.endTime = Date.now();
return stats;
}
_done(err, compilation) {
this.running = false;
if (this.invalid) return this._go();
const stats = compilation ? this._getStats(compilation) : null;
if (err) {
this.compiler.hooks.failed.call(err);
this.handler(err, stats);
return;
}
this.compiler.hooks.done.callAsync(stats, () => {
this.handler(null, stats);
if (!this.closed) {
this.watch(
Array.from(compilation.fileDependencies),
Array.from(compilation.contextDependencies),
Array.from(compilation.missingDependencies)
);
}
for (const cb of this.callbacks) cb();
this.callbacks.length = 0;
});
}
watch(files, dirs, missing) {
this.pausedWatcher = null;
this.watcher = this.compiler.watchFileSystem.watch(
files,
dirs,
missing,
this.startTime,
this.watchOptions,
(
err,
filesModified,
contextModified,
missingModified,
fileTimestamps,
contextTimestamps,
removedFiles
) => {
this.pausedWatcher = this.watcher;
this.watcher = null;
if (err) {
return this.handler(err);
}
this.compiler.fileTimestamps = fileTimestamps;
this.compiler.contextTimestamps = contextTimestamps;
this.compiler.removedFiles = removedFiles;
if (!this.suspended) {
this._invalidate();
}
},
(fileName, changeTime) => {
this.compiler.hooks.invalid.call(fileName, changeTime);
}
);
}
invalidate(callback) {
if (callback) {
this.callbacks.push(callback);
}
if (this.watcher) {
this.compiler.fileTimestamps = this.watcher.getFileTimestamps();
this.compiler.contextTimestamps = this.watcher.getContextTimestamps();
}
return this._invalidate();
}
_invalidate() {
if (this.watcher) {
this.pausedWatcher = this.watcher;
this.watcher.pause();
this.watcher = null;
}
if (this.running) {
this.invalid = true;
return false;
} else {
this._go();
}
}
suspend() {
this.suspended = true;
this.invalid = false;
}
resume() {
if (this.suspended) {
this.suspended = false;
this._invalidate();
}
}
close(callback) {
const finalCallback = () => {
this.compiler.hooks.watchClose.call();
this.compiler.running = false;
this.compiler.watchMode = false;
if (callback !== undefined) callback();
};
this.closed = true;
if (this.watcher) {
this.watcher.close();
this.watcher = null;
}
if (this.pausedWatcher) {
this.pausedWatcher.close();
this.pausedWatcher = null;
}
if (this.running) {
this.invalid = true;
this._done = finalCallback;
} else {
finalCallback();
}
}
}
module.exports = Watching;