polymer-build
Version:
A library of Gulp build tasks
320 lines • 12.6 kB
JavaScript
;
/**
* @license
* Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at
* http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at
* http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at
* http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at
* http://polymer.github.io/PATENTS.txt
*/
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
Object.defineProperty(exports, "__esModule", { value: true });
const mz_1 = require("mz");
const utils_1 = require("polymer-analyzer/lib/core/utils");
const stream_1 = require("stream");
const File = require("vinyl");
const multipipe = require('multipipe');
if (Symbol.asyncIterator === undefined) {
// tslint:disable-next-line: no-any polyfilling.
Symbol.asyncIterator = Symbol('asyncIterator');
}
/**
* Waits for the given ReadableStream
*/
function waitFor(stream) {
return new Promise((resolve, reject) => {
stream.on('end', resolve);
stream.on('error', reject);
});
}
exports.waitFor = waitFor;
/**
* Waits for all the given ReadableStreams
*/
function waitForAll(streams) {
return Promise.all(streams.map((s) => waitFor(s)));
}
exports.waitForAll = waitForAll;
/**
* Returns the string contents of a Vinyl File object, waiting for
* all chunks if the File is a stream.
*/
function getFileContents(file) {
return __awaiter(this, void 0, void 0, function* () {
if (file.isBuffer()) {
return file.contents.toString('utf-8');
}
else if (file.isStream()) {
const stream = file.contents;
stream.setEncoding('utf-8');
const contents = [];
stream.on('data', (chunk) => contents.push(chunk));
return new Promise((resolve, reject) => {
stream.on('end', () => resolve(contents.join('')));
stream.on('error', reject);
});
}
throw new Error(`Unable to get contents of file ${file.path}. ` +
`It has neither a buffer nor a stream.`);
});
}
exports.getFileContents = getFileContents;
/**
* Composes multiple streams (or Transforms) into one.
*/
function compose(streams) {
if (streams && streams.length > 0) {
return multipipe(streams);
}
else {
return new stream_1.PassThrough({ objectMode: true });
}
}
exports.compose = compose;
/**
* An asynchronous queue that is read as an async iterable.
*/
class AsyncQueue {
constructor() {
this.blockedOn = undefined;
this.backlog = [];
this._closed = false;
this._finished = false;
}
/**
* Add the given value onto the queue.
*
* The return value of this method resolves once the value has been removed
* from the queue. Useful for flow control.
*
* Must not be called after the queue has been closed.
*/
write(value) {
return __awaiter(this, void 0, void 0, function* () {
if (this._closed) {
throw new Error('Wrote to closed writable iterable');
}
return this._write({ value, done: false });
});
}
/**
* True once the queue has been closed and all input has been read from it.
*/
get finished() {
return this._finished;
}
/**
* Close the queue, indicating that no more values will be written.
*
* If this method is not called, a consumer iterating over the values will
* wait forever.
*
* The returned promise resolves once the consumer has been notified of the
* end of the queue.
*/
close() {
return __awaiter(this, void 0, void 0, function* () {
this._closed = true;
return this._write({ done: true });
});
}
_write(value) {
return __awaiter(this, void 0, void 0, function* () {
if (this.blockedOn) {
this.blockedOn.resolve(value);
this.blockedOn = undefined;
}
else {
const deferred = new utils_1.Deferred();
this.backlog.push({ value, deferred });
yield deferred.promise;
}
});
}
/**
* Iterate over values in the queue. Not intended for multiple readers.
* In the case where there are multiple readers, some values may be received
* by multiple readers, but all values will be seen by at least one reader.
*/
[Symbol.asyncIterator]() {
return __asyncGenerator(this, arguments, function* _a() {
while (true) {
let value;
const maybeValue = this.backlog.shift();
if (maybeValue) {
maybeValue.deferred.resolve(undefined);
value = maybeValue.value;
}
else {
this.blockedOn = new utils_1.Deferred();
value = yield __await(this.blockedOn.promise);
}
if (value.done) {
this._finished = true;
this._write(value);
return yield __await(void 0);
}
else {
yield yield __await(value.value);
}
}
});
}
}
/**
* Implements `stream.Transform` via standard async iteration.
*
* The main advantage over implementing stream.Transform itself is that correct
* error handling is built in and easy to get right, simply by using
* async/await.
*
* `In` and `Out` extend `{}` because they may not be `null`.
*/
class AsyncTransformStream extends stream_1.Transform {
constructor() {
super(...arguments);
this._inputs = new AsyncQueue();
this._initialized = false;
this._writingFinished = new utils_1.Deferred();
}
_initializeOnce() {
if (this._initialized === false) {
this._initialized = true;
const transformDonePromise = (() => __awaiter(this, void 0, void 0, function* () {
var e_1, _a;
try {
for (var _b = __asyncValues(this._transformIter(this._inputs)), _c; _c = yield _b.next(), !_c.done;) {
const value = _c.value;
// TODO(rictic): if `this.push` returns false, should we wait until
// we get a drain event to keep iterating?
this.push(value);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (_c && !_c.done && (_a = _b.return)) yield _a.call(_b);
}
finally { if (e_1) throw e_1.error; }
}
}))();
transformDonePromise.then(() => {
if (this._inputs.finished) {
this._writingFinished.resolve(undefined);
}
else {
this.emit('error', new Error(`${this.constructor.name}` +
` did not consume all input while transforming.`));
// Since _transformIter has exited, but not all input was consumed,
// this._flush won't be called. We need to signal manually that
// no more output will be written by this stream.
this.push(null);
}
}, (err) => this.emit('error', err));
}
}
/**
* Don't override.
*
* Passes input into this._inputs.
*/
_transform(input, _encoding, callback) {
this._initializeOnce();
this._inputs.write(input).then(() => {
callback();
}, (err) => callback(err));
}
/**
* Don't override.
*
* Finish writing out the outputs.
*/
_flush(callback) {
return __awaiter(this, void 0, void 0, function* () {
try {
// We won't get any more inputs. Wait for them all to be processed.
yield this._inputs.close();
// Wait for all of our output to be written.
yield this._writingFinished.promise;
callback();
}
catch (e) {
callback(e);
}
});
}
}
exports.AsyncTransformStream = AsyncTransformStream;
/**
* A stream that takes file path strings, and outputs full Vinyl file objects
* for the file at each location.
*/
class VinylReaderTransform extends AsyncTransformStream {
constructor() {
super({ objectMode: true });
}
_transformIter(paths) {
return __asyncGenerator(this, arguments, function* _transformIter_1() {
var e_2, _a;
try {
for (var paths_1 = __asyncValues(paths), paths_1_1; paths_1_1 = yield __await(paths_1.next()), !paths_1_1.done;) {
const filePath = paths_1_1.value;
yield yield __await(new File({ path: filePath, contents: yield __await(mz_1.fs.readFile(filePath)) }));
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (paths_1_1 && !paths_1_1.done && (_a = paths_1.return)) yield __await(_a.call(paths_1));
}
finally { if (e_2) throw e_2.error; }
}
});
}
}
exports.VinylReaderTransform = VinylReaderTransform;
/**
* pipeStreams() takes in a collection streams and pipes them together,
* returning the last stream in the pipeline. Each element in the `streams`
* array must be either a stream, or an array of streams (see PipeStream).
* pipeStreams() will then flatten this array before piping them all together.
*/
function pipeStreams(streams) {
return Array.prototype.concat.apply([], streams)
.reduce((a, b) => {
return a.pipe(b);
});
}
exports.pipeStreams = pipeStreams;
//# sourceMappingURL=streams.js.map