4214 lines
185 KiB
JavaScript
4214 lines
185 KiB
JavaScript
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/**
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* web-streams-polyfill v3.2.1
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*/
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
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}(this, (function (exports) { 'use strict';
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/// <reference lib="es2015.symbol" />
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const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
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Symbol :
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description => `Symbol(${description})`;
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/// <reference lib="dom" />
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function noop() {
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return undefined;
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}
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function getGlobals() {
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if (typeof self !== 'undefined') {
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return self;
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}
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else if (typeof window !== 'undefined') {
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return window;
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}
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else if (typeof global !== 'undefined') {
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return global;
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}
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return undefined;
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}
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const globals = getGlobals();
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function typeIsObject(x) {
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return (typeof x === 'object' && x !== null) || typeof x === 'function';
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}
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const rethrowAssertionErrorRejection = noop;
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const originalPromise = Promise;
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const originalPromiseThen = Promise.prototype.then;
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const originalPromiseResolve = Promise.resolve.bind(originalPromise);
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const originalPromiseReject = Promise.reject.bind(originalPromise);
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function newPromise(executor) {
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return new originalPromise(executor);
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}
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function promiseResolvedWith(value) {
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return originalPromiseResolve(value);
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}
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function promiseRejectedWith(reason) {
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return originalPromiseReject(reason);
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}
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function PerformPromiseThen(promise, onFulfilled, onRejected) {
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// There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
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// approximation.
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return originalPromiseThen.call(promise, onFulfilled, onRejected);
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}
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function uponPromise(promise, onFulfilled, onRejected) {
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PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
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}
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function uponFulfillment(promise, onFulfilled) {
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uponPromise(promise, onFulfilled);
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}
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function uponRejection(promise, onRejected) {
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uponPromise(promise, undefined, onRejected);
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}
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function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
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return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
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}
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function setPromiseIsHandledToTrue(promise) {
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PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
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}
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const queueMicrotask = (() => {
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const globalQueueMicrotask = globals && globals.queueMicrotask;
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if (typeof globalQueueMicrotask === 'function') {
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return globalQueueMicrotask;
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}
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const resolvedPromise = promiseResolvedWith(undefined);
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return (fn) => PerformPromiseThen(resolvedPromise, fn);
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})();
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function reflectCall(F, V, args) {
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if (typeof F !== 'function') {
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throw new TypeError('Argument is not a function');
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}
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return Function.prototype.apply.call(F, V, args);
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}
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function promiseCall(F, V, args) {
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try {
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return promiseResolvedWith(reflectCall(F, V, args));
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}
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catch (value) {
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return promiseRejectedWith(value);
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}
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}
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// Original from Chromium
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// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
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const QUEUE_MAX_ARRAY_SIZE = 16384;
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/**
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* Simple queue structure.
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*
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* Avoids scalability issues with using a packed array directly by using
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* multiple arrays in a linked list and keeping the array size bounded.
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*/
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class SimpleQueue {
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constructor() {
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this._cursor = 0;
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this._size = 0;
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// _front and _back are always defined.
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this._front = {
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_elements: [],
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_next: undefined
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};
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this._back = this._front;
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// The cursor is used to avoid calling Array.shift().
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// It contains the index of the front element of the array inside the
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// front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
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this._cursor = 0;
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// When there is only one node, size === elements.length - cursor.
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this._size = 0;
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}
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get length() {
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return this._size;
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}
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// For exception safety, this method is structured in order:
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// 1. Read state
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// 2. Calculate required state mutations
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// 3. Perform state mutations
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push(element) {
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const oldBack = this._back;
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let newBack = oldBack;
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if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
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newBack = {
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_elements: [],
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_next: undefined
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};
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}
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// push() is the mutation most likely to throw an exception, so it
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// goes first.
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oldBack._elements.push(element);
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if (newBack !== oldBack) {
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this._back = newBack;
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oldBack._next = newBack;
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}
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++this._size;
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}
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// Like push(), shift() follows the read -> calculate -> mutate pattern for
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// exception safety.
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shift() { // must not be called on an empty queue
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const oldFront = this._front;
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let newFront = oldFront;
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const oldCursor = this._cursor;
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let newCursor = oldCursor + 1;
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const elements = oldFront._elements;
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const element = elements[oldCursor];
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if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
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newFront = oldFront._next;
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newCursor = 0;
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}
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// No mutations before this point.
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--this._size;
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this._cursor = newCursor;
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if (oldFront !== newFront) {
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this._front = newFront;
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}
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// Permit shifted element to be garbage collected.
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elements[oldCursor] = undefined;
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return element;
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}
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// The tricky thing about forEach() is that it can be called
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// re-entrantly. The queue may be mutated inside the callback. It is easy to
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// see that push() within the callback has no negative effects since the end
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// of the queue is checked for on every iteration. If shift() is called
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// repeatedly within the callback then the next iteration may return an
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// element that has been removed. In this case the callback will be called
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// with undefined values until we either "catch up" with elements that still
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// exist or reach the back of the queue.
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forEach(callback) {
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let i = this._cursor;
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let node = this._front;
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let elements = node._elements;
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while (i !== elements.length || node._next !== undefined) {
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if (i === elements.length) {
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node = node._next;
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elements = node._elements;
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i = 0;
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if (elements.length === 0) {
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break;
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}
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}
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callback(elements[i]);
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++i;
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}
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}
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// Return the element that would be returned if shift() was called now,
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// without modifying the queue.
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peek() { // must not be called on an empty queue
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const front = this._front;
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const cursor = this._cursor;
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return front._elements[cursor];
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}
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}
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function ReadableStreamReaderGenericInitialize(reader, stream) {
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reader._ownerReadableStream = stream;
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stream._reader = reader;
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if (stream._state === 'readable') {
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defaultReaderClosedPromiseInitialize(reader);
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}
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else if (stream._state === 'closed') {
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defaultReaderClosedPromiseInitializeAsResolved(reader);
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}
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else {
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defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
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}
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}
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// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
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// check.
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function ReadableStreamReaderGenericCancel(reader, reason) {
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const stream = reader._ownerReadableStream;
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return ReadableStreamCancel(stream, reason);
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}
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function ReadableStreamReaderGenericRelease(reader) {
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if (reader._ownerReadableStream._state === 'readable') {
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defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
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}
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else {
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defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
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}
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reader._ownerReadableStream._reader = undefined;
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reader._ownerReadableStream = undefined;
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}
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// Helper functions for the readers.
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function readerLockException(name) {
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return new TypeError('Cannot ' + name + ' a stream using a released reader');
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}
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// Helper functions for the ReadableStreamDefaultReader.
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function defaultReaderClosedPromiseInitialize(reader) {
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reader._closedPromise = newPromise((resolve, reject) => {
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reader._closedPromise_resolve = resolve;
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reader._closedPromise_reject = reject;
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});
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}
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function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
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defaultReaderClosedPromiseInitialize(reader);
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defaultReaderClosedPromiseReject(reader, reason);
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}
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function defaultReaderClosedPromiseInitializeAsResolved(reader) {
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defaultReaderClosedPromiseInitialize(reader);
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defaultReaderClosedPromiseResolve(reader);
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}
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function defaultReaderClosedPromiseReject(reader, reason) {
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if (reader._closedPromise_reject === undefined) {
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return;
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}
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setPromiseIsHandledToTrue(reader._closedPromise);
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reader._closedPromise_reject(reason);
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reader._closedPromise_resolve = undefined;
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reader._closedPromise_reject = undefined;
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}
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function defaultReaderClosedPromiseResetToRejected(reader, reason) {
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defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
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}
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function defaultReaderClosedPromiseResolve(reader) {
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if (reader._closedPromise_resolve === undefined) {
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return;
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}
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reader._closedPromise_resolve(undefined);
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reader._closedPromise_resolve = undefined;
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reader._closedPromise_reject = undefined;
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}
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const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
|
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const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
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const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
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const PullSteps = SymbolPolyfill('[[PullSteps]]');
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/// <reference lib="es2015.core" />
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
|
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const NumberIsFinite = Number.isFinite || function (x) {
|
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return typeof x === 'number' && isFinite(x);
|
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};
|
|||
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|
|||
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/// <reference lib="es2015.core" />
|
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
|
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const MathTrunc = Math.trunc || function (v) {
|
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return v < 0 ? Math.ceil(v) : Math.floor(v);
|
|||
|
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};
|
|||
|
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|
|||
|
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// https://heycam.github.io/webidl/#idl-dictionaries
|
|||
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function isDictionary(x) {
|
|||
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return typeof x === 'object' || typeof x === 'function';
|
|||
|
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}
|
|||
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function assertDictionary(obj, context) {
|
|||
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if (obj !== undefined && !isDictionary(obj)) {
|
|||
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throw new TypeError(`${context} is not an object.`);
|
|||
|
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}
|
|||
|
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}
|
|||
|
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// https://heycam.github.io/webidl/#idl-callback-functions
|
|||
|
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function assertFunction(x, context) {
|
|||
|
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if (typeof x !== 'function') {
|
|||
|
|
throw new TypeError(`${context} is not a function.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// https://heycam.github.io/webidl/#idl-object
|
|||
|
|
function isObject(x) {
|
|||
|
|
return (typeof x === 'object' && x !== null) || typeof x === 'function';
|
|||
|
|
}
|
|||
|
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function assertObject(x, context) {
|
|||
|
|
if (!isObject(x)) {
|
|||
|
|
throw new TypeError(`${context} is not an object.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function assertRequiredArgument(x, position, context) {
|
|||
|
|
if (x === undefined) {
|
|||
|
|
throw new TypeError(`Parameter ${position} is required in '${context}'.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function assertRequiredField(x, field, context) {
|
|||
|
|
if (x === undefined) {
|
|||
|
|
throw new TypeError(`${field} is required in '${context}'.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// https://heycam.github.io/webidl/#idl-unrestricted-double
|
|||
|
|
function convertUnrestrictedDouble(value) {
|
|||
|
|
return Number(value);
|
|||
|
|
}
|
|||
|
|
function censorNegativeZero(x) {
|
|||
|
|
return x === 0 ? 0 : x;
|
|||
|
|
}
|
|||
|
|
function integerPart(x) {
|
|||
|
|
return censorNegativeZero(MathTrunc(x));
|
|||
|
|
}
|
|||
|
|
// https://heycam.github.io/webidl/#idl-unsigned-long-long
|
|||
|
|
function convertUnsignedLongLongWithEnforceRange(value, context) {
|
|||
|
|
const lowerBound = 0;
|
|||
|
|
const upperBound = Number.MAX_SAFE_INTEGER;
|
|||
|
|
let x = Number(value);
|
|||
|
|
x = censorNegativeZero(x);
|
|||
|
|
if (!NumberIsFinite(x)) {
|
|||
|
|
throw new TypeError(`${context} is not a finite number`);
|
|||
|
|
}
|
|||
|
|
x = integerPart(x);
|
|||
|
|
if (x < lowerBound || x > upperBound) {
|
|||
|
|
throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
|
|||
|
|
}
|
|||
|
|
if (!NumberIsFinite(x) || x === 0) {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
// TODO Use BigInt if supported?
|
|||
|
|
// let xBigInt = BigInt(integerPart(x));
|
|||
|
|
// xBigInt = BigInt.asUintN(64, xBigInt);
|
|||
|
|
// return Number(xBigInt);
|
|||
|
|
return x;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function assertReadableStream(x, context) {
|
|||
|
|
if (!IsReadableStream(x)) {
|
|||
|
|
throw new TypeError(`${context} is not a ReadableStream.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Abstract operations for the ReadableStream.
|
|||
|
|
function AcquireReadableStreamDefaultReader(stream) {
|
|||
|
|
return new ReadableStreamDefaultReader(stream);
|
|||
|
|
}
|
|||
|
|
// ReadableStream API exposed for controllers.
|
|||
|
|
function ReadableStreamAddReadRequest(stream, readRequest) {
|
|||
|
|
stream._reader._readRequests.push(readRequest);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamFulfillReadRequest(stream, chunk, done) {
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
const readRequest = reader._readRequests.shift();
|
|||
|
|
if (done) {
|
|||
|
|
readRequest._closeSteps();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
readRequest._chunkSteps(chunk);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableStreamGetNumReadRequests(stream) {
|
|||
|
|
return stream._reader._readRequests.length;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamHasDefaultReader(stream) {
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
if (reader === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!IsReadableStreamDefaultReader(reader)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* A default reader vended by a {@link ReadableStream}.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableStreamDefaultReader {
|
|||
|
|
constructor(stream) {
|
|||
|
|
assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
|
|||
|
|
assertReadableStream(stream, 'First parameter');
|
|||
|
|
if (IsReadableStreamLocked(stream)) {
|
|||
|
|
throw new TypeError('This stream has already been locked for exclusive reading by another reader');
|
|||
|
|
}
|
|||
|
|
ReadableStreamReaderGenericInitialize(this, stream);
|
|||
|
|
this._readRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns a promise that will be fulfilled when the stream becomes closed,
|
|||
|
|
* or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
|
|||
|
|
*/
|
|||
|
|
get closed() {
|
|||
|
|
if (!IsReadableStreamDefaultReader(this)) {
|
|||
|
|
return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
|
|||
|
|
}
|
|||
|
|
return this._closedPromise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
|
|||
|
|
*/
|
|||
|
|
cancel(reason = undefined) {
|
|||
|
|
if (!IsReadableStreamDefaultReader(this)) {
|
|||
|
|
return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
|
|||
|
|
}
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('cancel'));
|
|||
|
|
}
|
|||
|
|
return ReadableStreamReaderGenericCancel(this, reason);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
|
|||
|
|
*
|
|||
|
|
* If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
|
|||
|
|
*/
|
|||
|
|
read() {
|
|||
|
|
if (!IsReadableStreamDefaultReader(this)) {
|
|||
|
|
return promiseRejectedWith(defaultReaderBrandCheckException('read'));
|
|||
|
|
}
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('read from'));
|
|||
|
|
}
|
|||
|
|
let resolvePromise;
|
|||
|
|
let rejectPromise;
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
resolvePromise = resolve;
|
|||
|
|
rejectPromise = reject;
|
|||
|
|
});
|
|||
|
|
const readRequest = {
|
|||
|
|
_chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
|
|||
|
|
_closeSteps: () => resolvePromise({ value: undefined, done: true }),
|
|||
|
|
_errorSteps: e => rejectPromise(e)
|
|||
|
|
};
|
|||
|
|
ReadableStreamDefaultReaderRead(this, readRequest);
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
|
|||
|
|
* If the associated stream is errored when the lock is released, the reader will appear errored in the same way
|
|||
|
|
* from now on; otherwise, the reader will appear closed.
|
|||
|
|
*
|
|||
|
|
* A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
|
|||
|
|
* the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
|
|||
|
|
* do so will throw a `TypeError` and leave the reader locked to the stream.
|
|||
|
|
*/
|
|||
|
|
releaseLock() {
|
|||
|
|
if (!IsReadableStreamDefaultReader(this)) {
|
|||
|
|
throw defaultReaderBrandCheckException('releaseLock');
|
|||
|
|
}
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (this._readRequests.length > 0) {
|
|||
|
|
throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
|
|||
|
|
}
|
|||
|
|
ReadableStreamReaderGenericRelease(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableStreamDefaultReader.prototype, {
|
|||
|
|
cancel: { enumerable: true },
|
|||
|
|
read: { enumerable: true },
|
|||
|
|
releaseLock: { enumerable: true },
|
|||
|
|
closed: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableStreamDefaultReader',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the readers.
|
|||
|
|
function IsReadableStreamDefaultReader(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableStreamDefaultReader;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultReaderRead(reader, readRequest) {
|
|||
|
|
const stream = reader._ownerReadableStream;
|
|||
|
|
stream._disturbed = true;
|
|||
|
|
if (stream._state === 'closed') {
|
|||
|
|
readRequest._closeSteps();
|
|||
|
|
}
|
|||
|
|
else if (stream._state === 'errored') {
|
|||
|
|
readRequest._errorSteps(stream._storedError);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
stream._readableStreamController[PullSteps](readRequest);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStreamDefaultReader.
|
|||
|
|
function defaultReaderBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <reference lib="es2018.asynciterable" />
|
|||
|
|
/* eslint-disable @typescript-eslint/no-empty-function */
|
|||
|
|
const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
|
|||
|
|
|
|||
|
|
/// <reference lib="es2018.asynciterable" />
|
|||
|
|
class ReadableStreamAsyncIteratorImpl {
|
|||
|
|
constructor(reader, preventCancel) {
|
|||
|
|
this._ongoingPromise = undefined;
|
|||
|
|
this._isFinished = false;
|
|||
|
|
this._reader = reader;
|
|||
|
|
this._preventCancel = preventCancel;
|
|||
|
|
}
|
|||
|
|
next() {
|
|||
|
|
const nextSteps = () => this._nextSteps();
|
|||
|
|
this._ongoingPromise = this._ongoingPromise ?
|
|||
|
|
transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
|
|||
|
|
nextSteps();
|
|||
|
|
return this._ongoingPromise;
|
|||
|
|
}
|
|||
|
|
return(value) {
|
|||
|
|
const returnSteps = () => this._returnSteps(value);
|
|||
|
|
return this._ongoingPromise ?
|
|||
|
|
transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
|
|||
|
|
returnSteps();
|
|||
|
|
}
|
|||
|
|
_nextSteps() {
|
|||
|
|
if (this._isFinished) {
|
|||
|
|
return Promise.resolve({ value: undefined, done: true });
|
|||
|
|
}
|
|||
|
|
const reader = this._reader;
|
|||
|
|
if (reader._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('iterate'));
|
|||
|
|
}
|
|||
|
|
let resolvePromise;
|
|||
|
|
let rejectPromise;
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
resolvePromise = resolve;
|
|||
|
|
rejectPromise = reject;
|
|||
|
|
});
|
|||
|
|
const readRequest = {
|
|||
|
|
_chunkSteps: chunk => {
|
|||
|
|
this._ongoingPromise = undefined;
|
|||
|
|
// This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
|
|||
|
|
// FIXME Is this a bug in the specification, or in the test?
|
|||
|
|
queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
|
|||
|
|
},
|
|||
|
|
_closeSteps: () => {
|
|||
|
|
this._ongoingPromise = undefined;
|
|||
|
|
this._isFinished = true;
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
resolvePromise({ value: undefined, done: true });
|
|||
|
|
},
|
|||
|
|
_errorSteps: reason => {
|
|||
|
|
this._ongoingPromise = undefined;
|
|||
|
|
this._isFinished = true;
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
rejectPromise(reason);
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
ReadableStreamDefaultReaderRead(reader, readRequest);
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
_returnSteps(value) {
|
|||
|
|
if (this._isFinished) {
|
|||
|
|
return Promise.resolve({ value, done: true });
|
|||
|
|
}
|
|||
|
|
this._isFinished = true;
|
|||
|
|
const reader = this._reader;
|
|||
|
|
if (reader._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('finish iterating'));
|
|||
|
|
}
|
|||
|
|
if (!this._preventCancel) {
|
|||
|
|
const result = ReadableStreamReaderGenericCancel(reader, value);
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
return transformPromiseWith(result, () => ({ value, done: true }));
|
|||
|
|
}
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
return promiseResolvedWith({ value, done: true });
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
const ReadableStreamAsyncIteratorPrototype = {
|
|||
|
|
next() {
|
|||
|
|
if (!IsReadableStreamAsyncIterator(this)) {
|
|||
|
|
return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
|
|||
|
|
}
|
|||
|
|
return this._asyncIteratorImpl.next();
|
|||
|
|
},
|
|||
|
|
return(value) {
|
|||
|
|
if (!IsReadableStreamAsyncIterator(this)) {
|
|||
|
|
return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
|
|||
|
|
}
|
|||
|
|
return this._asyncIteratorImpl.return(value);
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
if (AsyncIteratorPrototype !== undefined) {
|
|||
|
|
Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the ReadableStream.
|
|||
|
|
function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
|
|||
|
|
const reader = AcquireReadableStreamDefaultReader(stream);
|
|||
|
|
const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
|
|||
|
|
const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
|
|||
|
|
iterator._asyncIteratorImpl = impl;
|
|||
|
|
return iterator;
|
|||
|
|
}
|
|||
|
|
function IsReadableStreamAsyncIterator(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
try {
|
|||
|
|
// noinspection SuspiciousTypeOfGuard
|
|||
|
|
return x._asyncIteratorImpl instanceof
|
|||
|
|
ReadableStreamAsyncIteratorImpl;
|
|||
|
|
}
|
|||
|
|
catch (_a) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStream.
|
|||
|
|
function streamAsyncIteratorBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <reference lib="es2015.core" />
|
|||
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
|
|||
|
|
const NumberIsNaN = Number.isNaN || function (x) {
|
|||
|
|
// eslint-disable-next-line no-self-compare
|
|||
|
|
return x !== x;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
function CreateArrayFromList(elements) {
|
|||
|
|
// We use arrays to represent lists, so this is basically a no-op.
|
|||
|
|
// Do a slice though just in case we happen to depend on the unique-ness.
|
|||
|
|
return elements.slice();
|
|||
|
|
}
|
|||
|
|
function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
|
|||
|
|
new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
|
|||
|
|
}
|
|||
|
|
// Not implemented correctly
|
|||
|
|
function TransferArrayBuffer(O) {
|
|||
|
|
return O;
|
|||
|
|
}
|
|||
|
|
// Not implemented correctly
|
|||
|
|
// eslint-disable-next-line @typescript-eslint/no-unused-vars
|
|||
|
|
function IsDetachedBuffer(O) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
function ArrayBufferSlice(buffer, begin, end) {
|
|||
|
|
// ArrayBuffer.prototype.slice is not available on IE10
|
|||
|
|
// https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
|
|||
|
|
if (buffer.slice) {
|
|||
|
|
return buffer.slice(begin, end);
|
|||
|
|
}
|
|||
|
|
const length = end - begin;
|
|||
|
|
const slice = new ArrayBuffer(length);
|
|||
|
|
CopyDataBlockBytes(slice, 0, buffer, begin, length);
|
|||
|
|
return slice;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function IsNonNegativeNumber(v) {
|
|||
|
|
if (typeof v !== 'number') {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (NumberIsNaN(v)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (v < 0) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
function CloneAsUint8Array(O) {
|
|||
|
|
const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
|
|||
|
|
return new Uint8Array(buffer);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function DequeueValue(container) {
|
|||
|
|
const pair = container._queue.shift();
|
|||
|
|
container._queueTotalSize -= pair.size;
|
|||
|
|
if (container._queueTotalSize < 0) {
|
|||
|
|
container._queueTotalSize = 0;
|
|||
|
|
}
|
|||
|
|
return pair.value;
|
|||
|
|
}
|
|||
|
|
function EnqueueValueWithSize(container, value, size) {
|
|||
|
|
if (!IsNonNegativeNumber(size) || size === Infinity) {
|
|||
|
|
throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
|
|||
|
|
}
|
|||
|
|
container._queue.push({ value, size });
|
|||
|
|
container._queueTotalSize += size;
|
|||
|
|
}
|
|||
|
|
function PeekQueueValue(container) {
|
|||
|
|
const pair = container._queue.peek();
|
|||
|
|
return pair.value;
|
|||
|
|
}
|
|||
|
|
function ResetQueue(container) {
|
|||
|
|
container._queue = new SimpleQueue();
|
|||
|
|
container._queueTotalSize = 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* A pull-into request in a {@link ReadableByteStreamController}.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableStreamBYOBRequest {
|
|||
|
|
constructor() {
|
|||
|
|
throw new TypeError('Illegal constructor');
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
|
|||
|
|
*/
|
|||
|
|
get view() {
|
|||
|
|
if (!IsReadableStreamBYOBRequest(this)) {
|
|||
|
|
throw byobRequestBrandCheckException('view');
|
|||
|
|
}
|
|||
|
|
return this._view;
|
|||
|
|
}
|
|||
|
|
respond(bytesWritten) {
|
|||
|
|
if (!IsReadableStreamBYOBRequest(this)) {
|
|||
|
|
throw byobRequestBrandCheckException('respond');
|
|||
|
|
}
|
|||
|
|
assertRequiredArgument(bytesWritten, 1, 'respond');
|
|||
|
|
bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
|
|||
|
|
if (this._associatedReadableByteStreamController === undefined) {
|
|||
|
|
throw new TypeError('This BYOB request has been invalidated');
|
|||
|
|
}
|
|||
|
|
if (IsDetachedBuffer(this._view.buffer)) ;
|
|||
|
|
ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
|
|||
|
|
}
|
|||
|
|
respondWithNewView(view) {
|
|||
|
|
if (!IsReadableStreamBYOBRequest(this)) {
|
|||
|
|
throw byobRequestBrandCheckException('respondWithNewView');
|
|||
|
|
}
|
|||
|
|
assertRequiredArgument(view, 1, 'respondWithNewView');
|
|||
|
|
if (!ArrayBuffer.isView(view)) {
|
|||
|
|
throw new TypeError('You can only respond with array buffer views');
|
|||
|
|
}
|
|||
|
|
if (this._associatedReadableByteStreamController === undefined) {
|
|||
|
|
throw new TypeError('This BYOB request has been invalidated');
|
|||
|
|
}
|
|||
|
|
if (IsDetachedBuffer(view.buffer)) ;
|
|||
|
|
ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
|
|||
|
|
respond: { enumerable: true },
|
|||
|
|
respondWithNewView: { enumerable: true },
|
|||
|
|
view: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableStreamBYOBRequest',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableByteStreamController {
|
|||
|
|
constructor() {
|
|||
|
|
throw new TypeError('Illegal constructor');
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the current BYOB pull request, or `null` if there isn't one.
|
|||
|
|
*/
|
|||
|
|
get byobRequest() {
|
|||
|
|
if (!IsReadableByteStreamController(this)) {
|
|||
|
|
throw byteStreamControllerBrandCheckException('byobRequest');
|
|||
|
|
}
|
|||
|
|
return ReadableByteStreamControllerGetBYOBRequest(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
|
|||
|
|
* over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
|
|||
|
|
*/
|
|||
|
|
get desiredSize() {
|
|||
|
|
if (!IsReadableByteStreamController(this)) {
|
|||
|
|
throw byteStreamControllerBrandCheckException('desiredSize');
|
|||
|
|
}
|
|||
|
|
return ReadableByteStreamControllerGetDesiredSize(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
|
|||
|
|
* the stream, but once those are read, the stream will become closed.
|
|||
|
|
*/
|
|||
|
|
close() {
|
|||
|
|
if (!IsReadableByteStreamController(this)) {
|
|||
|
|
throw byteStreamControllerBrandCheckException('close');
|
|||
|
|
}
|
|||
|
|
if (this._closeRequested) {
|
|||
|
|
throw new TypeError('The stream has already been closed; do not close it again!');
|
|||
|
|
}
|
|||
|
|
const state = this._controlledReadableByteStream._state;
|
|||
|
|
if (state !== 'readable') {
|
|||
|
|
throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerClose(this);
|
|||
|
|
}
|
|||
|
|
enqueue(chunk) {
|
|||
|
|
if (!IsReadableByteStreamController(this)) {
|
|||
|
|
throw byteStreamControllerBrandCheckException('enqueue');
|
|||
|
|
}
|
|||
|
|
assertRequiredArgument(chunk, 1, 'enqueue');
|
|||
|
|
if (!ArrayBuffer.isView(chunk)) {
|
|||
|
|
throw new TypeError('chunk must be an array buffer view');
|
|||
|
|
}
|
|||
|
|
if (chunk.byteLength === 0) {
|
|||
|
|
throw new TypeError('chunk must have non-zero byteLength');
|
|||
|
|
}
|
|||
|
|
if (chunk.buffer.byteLength === 0) {
|
|||
|
|
throw new TypeError(`chunk's buffer must have non-zero byteLength`);
|
|||
|
|
}
|
|||
|
|
if (this._closeRequested) {
|
|||
|
|
throw new TypeError('stream is closed or draining');
|
|||
|
|
}
|
|||
|
|
const state = this._controlledReadableByteStream._state;
|
|||
|
|
if (state !== 'readable') {
|
|||
|
|
throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerEnqueue(this, chunk);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
|
|||
|
|
*/
|
|||
|
|
error(e = undefined) {
|
|||
|
|
if (!IsReadableByteStreamController(this)) {
|
|||
|
|
throw byteStreamControllerBrandCheckException('error');
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerError(this, e);
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[CancelSteps](reason) {
|
|||
|
|
ReadableByteStreamControllerClearPendingPullIntos(this);
|
|||
|
|
ResetQueue(this);
|
|||
|
|
const result = this._cancelAlgorithm(reason);
|
|||
|
|
ReadableByteStreamControllerClearAlgorithms(this);
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[PullSteps](readRequest) {
|
|||
|
|
const stream = this._controlledReadableByteStream;
|
|||
|
|
if (this._queueTotalSize > 0) {
|
|||
|
|
const entry = this._queue.shift();
|
|||
|
|
this._queueTotalSize -= entry.byteLength;
|
|||
|
|
ReadableByteStreamControllerHandleQueueDrain(this);
|
|||
|
|
const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
|
|||
|
|
readRequest._chunkSteps(view);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const autoAllocateChunkSize = this._autoAllocateChunkSize;
|
|||
|
|
if (autoAllocateChunkSize !== undefined) {
|
|||
|
|
let buffer;
|
|||
|
|
try {
|
|||
|
|
buffer = new ArrayBuffer(autoAllocateChunkSize);
|
|||
|
|
}
|
|||
|
|
catch (bufferE) {
|
|||
|
|
readRequest._errorSteps(bufferE);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const pullIntoDescriptor = {
|
|||
|
|
buffer,
|
|||
|
|
bufferByteLength: autoAllocateChunkSize,
|
|||
|
|
byteOffset: 0,
|
|||
|
|
byteLength: autoAllocateChunkSize,
|
|||
|
|
bytesFilled: 0,
|
|||
|
|
elementSize: 1,
|
|||
|
|
viewConstructor: Uint8Array,
|
|||
|
|
readerType: 'default'
|
|||
|
|
};
|
|||
|
|
this._pendingPullIntos.push(pullIntoDescriptor);
|
|||
|
|
}
|
|||
|
|
ReadableStreamAddReadRequest(stream, readRequest);
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableByteStreamController.prototype, {
|
|||
|
|
close: { enumerable: true },
|
|||
|
|
enqueue: { enumerable: true },
|
|||
|
|
error: { enumerable: true },
|
|||
|
|
byobRequest: { enumerable: true },
|
|||
|
|
desiredSize: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableByteStreamController',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the ReadableByteStreamController.
|
|||
|
|
function IsReadableByteStreamController(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableByteStreamController;
|
|||
|
|
}
|
|||
|
|
function IsReadableStreamBYOBRequest(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableStreamBYOBRequest;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerCallPullIfNeeded(controller) {
|
|||
|
|
const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
|
|||
|
|
if (!shouldPull) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._pulling) {
|
|||
|
|
controller._pullAgain = true;
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
controller._pulling = true;
|
|||
|
|
// TODO: Test controller argument
|
|||
|
|
const pullPromise = controller._pullAlgorithm();
|
|||
|
|
uponPromise(pullPromise, () => {
|
|||
|
|
controller._pulling = false;
|
|||
|
|
if (controller._pullAgain) {
|
|||
|
|
controller._pullAgain = false;
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
}, e => {
|
|||
|
|
ReadableByteStreamControllerError(controller, e);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerClearPendingPullIntos(controller) {
|
|||
|
|
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
|
|||
|
|
controller._pendingPullIntos = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
|
|||
|
|
let done = false;
|
|||
|
|
if (stream._state === 'closed') {
|
|||
|
|
done = true;
|
|||
|
|
}
|
|||
|
|
const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
|
|||
|
|
if (pullIntoDescriptor.readerType === 'default') {
|
|||
|
|
ReadableStreamFulfillReadRequest(stream, filledView, done);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
|
|||
|
|
const bytesFilled = pullIntoDescriptor.bytesFilled;
|
|||
|
|
const elementSize = pullIntoDescriptor.elementSize;
|
|||
|
|
return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
|
|||
|
|
controller._queue.push({ buffer, byteOffset, byteLength });
|
|||
|
|
controller._queueTotalSize += byteLength;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
|
|||
|
|
const elementSize = pullIntoDescriptor.elementSize;
|
|||
|
|
const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
|
|||
|
|
const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
|
|||
|
|
const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
|
|||
|
|
const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
|
|||
|
|
let totalBytesToCopyRemaining = maxBytesToCopy;
|
|||
|
|
let ready = false;
|
|||
|
|
if (maxAlignedBytes > currentAlignedBytes) {
|
|||
|
|
totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
|
|||
|
|
ready = true;
|
|||
|
|
}
|
|||
|
|
const queue = controller._queue;
|
|||
|
|
while (totalBytesToCopyRemaining > 0) {
|
|||
|
|
const headOfQueue = queue.peek();
|
|||
|
|
const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
|
|||
|
|
const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
|
|||
|
|
CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
|
|||
|
|
if (headOfQueue.byteLength === bytesToCopy) {
|
|||
|
|
queue.shift();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
headOfQueue.byteOffset += bytesToCopy;
|
|||
|
|
headOfQueue.byteLength -= bytesToCopy;
|
|||
|
|
}
|
|||
|
|
controller._queueTotalSize -= bytesToCopy;
|
|||
|
|
ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
|
|||
|
|
totalBytesToCopyRemaining -= bytesToCopy;
|
|||
|
|
}
|
|||
|
|
return ready;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
|
|||
|
|
pullIntoDescriptor.bytesFilled += size;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerHandleQueueDrain(controller) {
|
|||
|
|
if (controller._queueTotalSize === 0 && controller._closeRequested) {
|
|||
|
|
ReadableByteStreamControllerClearAlgorithms(controller);
|
|||
|
|
ReadableStreamClose(controller._controlledReadableByteStream);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
|
|||
|
|
if (controller._byobRequest === null) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
controller._byobRequest._associatedReadableByteStreamController = undefined;
|
|||
|
|
controller._byobRequest._view = null;
|
|||
|
|
controller._byobRequest = null;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
|
|||
|
|
while (controller._pendingPullIntos.length > 0) {
|
|||
|
|
if (controller._queueTotalSize === 0) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const pullIntoDescriptor = controller._pendingPullIntos.peek();
|
|||
|
|
if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
|
|||
|
|
ReadableByteStreamControllerShiftPendingPullInto(controller);
|
|||
|
|
ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
let elementSize = 1;
|
|||
|
|
if (view.constructor !== DataView) {
|
|||
|
|
elementSize = view.constructor.BYTES_PER_ELEMENT;
|
|||
|
|
}
|
|||
|
|
const ctor = view.constructor;
|
|||
|
|
// try {
|
|||
|
|
const buffer = TransferArrayBuffer(view.buffer);
|
|||
|
|
// } catch (e) {
|
|||
|
|
// readIntoRequest._errorSteps(e);
|
|||
|
|
// return;
|
|||
|
|
// }
|
|||
|
|
const pullIntoDescriptor = {
|
|||
|
|
buffer,
|
|||
|
|
bufferByteLength: buffer.byteLength,
|
|||
|
|
byteOffset: view.byteOffset,
|
|||
|
|
byteLength: view.byteLength,
|
|||
|
|
bytesFilled: 0,
|
|||
|
|
elementSize,
|
|||
|
|
viewConstructor: ctor,
|
|||
|
|
readerType: 'byob'
|
|||
|
|
};
|
|||
|
|
if (controller._pendingPullIntos.length > 0) {
|
|||
|
|
controller._pendingPullIntos.push(pullIntoDescriptor);
|
|||
|
|
// No ReadableByteStreamControllerCallPullIfNeeded() call since:
|
|||
|
|
// - No change happens on desiredSize
|
|||
|
|
// - The source has already been notified of that there's at least 1 pending read(view)
|
|||
|
|
ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (stream._state === 'closed') {
|
|||
|
|
const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
|
|||
|
|
readIntoRequest._closeSteps(emptyView);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._queueTotalSize > 0) {
|
|||
|
|
if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
|
|||
|
|
const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
|
|||
|
|
ReadableByteStreamControllerHandleQueueDrain(controller);
|
|||
|
|
readIntoRequest._chunkSteps(filledView);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._closeRequested) {
|
|||
|
|
const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
|
|||
|
|
ReadableByteStreamControllerError(controller, e);
|
|||
|
|
readIntoRequest._errorSteps(e);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
controller._pendingPullIntos.push(pullIntoDescriptor);
|
|||
|
|
ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
if (ReadableStreamHasBYOBReader(stream)) {
|
|||
|
|
while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
|
|||
|
|
const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
|
|||
|
|
ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
|
|||
|
|
ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
|
|||
|
|
if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerShiftPendingPullInto(controller);
|
|||
|
|
const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
|
|||
|
|
if (remainderSize > 0) {
|
|||
|
|
const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
|
|||
|
|
const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
|
|||
|
|
ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
|
|||
|
|
}
|
|||
|
|
pullIntoDescriptor.bytesFilled -= remainderSize;
|
|||
|
|
ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
|
|||
|
|
ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
|
|||
|
|
const firstDescriptor = controller._pendingPullIntos.peek();
|
|||
|
|
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
|
|||
|
|
const state = controller._controlledReadableByteStream._state;
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
ReadableByteStreamControllerRespondInClosedState(controller);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerShiftPendingPullInto(controller) {
|
|||
|
|
const descriptor = controller._pendingPullIntos.shift();
|
|||
|
|
return descriptor;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerShouldCallPull(controller) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
if (stream._state !== 'readable') {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (controller._closeRequested) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!controller._started) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
|
|||
|
|
if (desiredSize > 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerClearAlgorithms(controller) {
|
|||
|
|
controller._pullAlgorithm = undefined;
|
|||
|
|
controller._cancelAlgorithm = undefined;
|
|||
|
|
}
|
|||
|
|
// A client of ReadableByteStreamController may use these functions directly to bypass state check.
|
|||
|
|
function ReadableByteStreamControllerClose(controller) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
if (controller._closeRequested || stream._state !== 'readable') {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._queueTotalSize > 0) {
|
|||
|
|
controller._closeRequested = true;
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._pendingPullIntos.length > 0) {
|
|||
|
|
const firstPendingPullInto = controller._pendingPullIntos.peek();
|
|||
|
|
if (firstPendingPullInto.bytesFilled > 0) {
|
|||
|
|
const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
|
|||
|
|
ReadableByteStreamControllerError(controller, e);
|
|||
|
|
throw e;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerClearAlgorithms(controller);
|
|||
|
|
ReadableStreamClose(stream);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerEnqueue(controller, chunk) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
if (controller._closeRequested || stream._state !== 'readable') {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const buffer = chunk.buffer;
|
|||
|
|
const byteOffset = chunk.byteOffset;
|
|||
|
|
const byteLength = chunk.byteLength;
|
|||
|
|
const transferredBuffer = TransferArrayBuffer(buffer);
|
|||
|
|
if (controller._pendingPullIntos.length > 0) {
|
|||
|
|
const firstPendingPullInto = controller._pendingPullIntos.peek();
|
|||
|
|
if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
|
|||
|
|
firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerInvalidateBYOBRequest(controller);
|
|||
|
|
if (ReadableStreamHasDefaultReader(stream)) {
|
|||
|
|
if (ReadableStreamGetNumReadRequests(stream) === 0) {
|
|||
|
|
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
if (controller._pendingPullIntos.length > 0) {
|
|||
|
|
ReadableByteStreamControllerShiftPendingPullInto(controller);
|
|||
|
|
}
|
|||
|
|
const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
|
|||
|
|
ReadableStreamFulfillReadRequest(stream, transferredView, false);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else if (ReadableStreamHasBYOBReader(stream)) {
|
|||
|
|
// TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
|
|||
|
|
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
|
|||
|
|
ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerError(controller, e) {
|
|||
|
|
const stream = controller._controlledReadableByteStream;
|
|||
|
|
if (stream._state !== 'readable') {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerClearPendingPullIntos(controller);
|
|||
|
|
ResetQueue(controller);
|
|||
|
|
ReadableByteStreamControllerClearAlgorithms(controller);
|
|||
|
|
ReadableStreamError(stream, e);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerGetBYOBRequest(controller) {
|
|||
|
|
if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
|
|||
|
|
const firstDescriptor = controller._pendingPullIntos.peek();
|
|||
|
|
const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
|
|||
|
|
const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
|
|||
|
|
SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
|
|||
|
|
controller._byobRequest = byobRequest;
|
|||
|
|
}
|
|||
|
|
return controller._byobRequest;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerGetDesiredSize(controller) {
|
|||
|
|
const state = controller._controlledReadableByteStream._state;
|
|||
|
|
if (state === 'errored') {
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
return controller._strategyHWM - controller._queueTotalSize;
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerRespond(controller, bytesWritten) {
|
|||
|
|
const firstDescriptor = controller._pendingPullIntos.peek();
|
|||
|
|
const state = controller._controlledReadableByteStream._state;
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
if (bytesWritten !== 0) {
|
|||
|
|
throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
if (bytesWritten === 0) {
|
|||
|
|
throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
|
|||
|
|
}
|
|||
|
|
if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
|
|||
|
|
throw new RangeError('bytesWritten out of range');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
|
|||
|
|
ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamControllerRespondWithNewView(controller, view) {
|
|||
|
|
const firstDescriptor = controller._pendingPullIntos.peek();
|
|||
|
|
const state = controller._controlledReadableByteStream._state;
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
if (view.byteLength !== 0) {
|
|||
|
|
throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
if (view.byteLength === 0) {
|
|||
|
|
throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
|
|||
|
|
throw new RangeError('The region specified by view does not match byobRequest');
|
|||
|
|
}
|
|||
|
|
if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
|
|||
|
|
throw new RangeError('The buffer of view has different capacity than byobRequest');
|
|||
|
|
}
|
|||
|
|
if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
|
|||
|
|
throw new RangeError('The region specified by view is larger than byobRequest');
|
|||
|
|
}
|
|||
|
|
const viewByteLength = view.byteLength;
|
|||
|
|
firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
|
|||
|
|
ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
|
|||
|
|
}
|
|||
|
|
function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
|
|||
|
|
controller._controlledReadableByteStream = stream;
|
|||
|
|
controller._pullAgain = false;
|
|||
|
|
controller._pulling = false;
|
|||
|
|
controller._byobRequest = null;
|
|||
|
|
// Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
|
|||
|
|
controller._queue = controller._queueTotalSize = undefined;
|
|||
|
|
ResetQueue(controller);
|
|||
|
|
controller._closeRequested = false;
|
|||
|
|
controller._started = false;
|
|||
|
|
controller._strategyHWM = highWaterMark;
|
|||
|
|
controller._pullAlgorithm = pullAlgorithm;
|
|||
|
|
controller._cancelAlgorithm = cancelAlgorithm;
|
|||
|
|
controller._autoAllocateChunkSize = autoAllocateChunkSize;
|
|||
|
|
controller._pendingPullIntos = new SimpleQueue();
|
|||
|
|
stream._readableStreamController = controller;
|
|||
|
|
const startResult = startAlgorithm();
|
|||
|
|
uponPromise(promiseResolvedWith(startResult), () => {
|
|||
|
|
controller._started = true;
|
|||
|
|
ReadableByteStreamControllerCallPullIfNeeded(controller);
|
|||
|
|
}, r => {
|
|||
|
|
ReadableByteStreamControllerError(controller, r);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
|
|||
|
|
const controller = Object.create(ReadableByteStreamController.prototype);
|
|||
|
|
let startAlgorithm = () => undefined;
|
|||
|
|
let pullAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
let cancelAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
if (underlyingByteSource.start !== undefined) {
|
|||
|
|
startAlgorithm = () => underlyingByteSource.start(controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingByteSource.pull !== undefined) {
|
|||
|
|
pullAlgorithm = () => underlyingByteSource.pull(controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingByteSource.cancel !== undefined) {
|
|||
|
|
cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
|
|||
|
|
}
|
|||
|
|
const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
|
|||
|
|
if (autoAllocateChunkSize === 0) {
|
|||
|
|
throw new TypeError('autoAllocateChunkSize must be greater than 0');
|
|||
|
|
}
|
|||
|
|
SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
|
|||
|
|
}
|
|||
|
|
function SetUpReadableStreamBYOBRequest(request, controller, view) {
|
|||
|
|
request._associatedReadableByteStreamController = controller;
|
|||
|
|
request._view = view;
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStreamBYOBRequest.
|
|||
|
|
function byobRequestBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableByteStreamController.
|
|||
|
|
function byteStreamControllerBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Abstract operations for the ReadableStream.
|
|||
|
|
function AcquireReadableStreamBYOBReader(stream) {
|
|||
|
|
return new ReadableStreamBYOBReader(stream);
|
|||
|
|
}
|
|||
|
|
// ReadableStream API exposed for controllers.
|
|||
|
|
function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
|
|||
|
|
stream._reader._readIntoRequests.push(readIntoRequest);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
const readIntoRequest = reader._readIntoRequests.shift();
|
|||
|
|
if (done) {
|
|||
|
|
readIntoRequest._closeSteps(chunk);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
readIntoRequest._chunkSteps(chunk);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableStreamGetNumReadIntoRequests(stream) {
|
|||
|
|
return stream._reader._readIntoRequests.length;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamHasBYOBReader(stream) {
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
if (reader === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!IsReadableStreamBYOBReader(reader)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* A BYOB reader vended by a {@link ReadableStream}.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableStreamBYOBReader {
|
|||
|
|
constructor(stream) {
|
|||
|
|
assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
|
|||
|
|
assertReadableStream(stream, 'First parameter');
|
|||
|
|
if (IsReadableStreamLocked(stream)) {
|
|||
|
|
throw new TypeError('This stream has already been locked for exclusive reading by another reader');
|
|||
|
|
}
|
|||
|
|
if (!IsReadableByteStreamController(stream._readableStreamController)) {
|
|||
|
|
throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
|
|||
|
|
'source');
|
|||
|
|
}
|
|||
|
|
ReadableStreamReaderGenericInitialize(this, stream);
|
|||
|
|
this._readIntoRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
|
|||
|
|
* the reader's lock is released before the stream finishes closing.
|
|||
|
|
*/
|
|||
|
|
get closed() {
|
|||
|
|
if (!IsReadableStreamBYOBReader(this)) {
|
|||
|
|
return promiseRejectedWith(byobReaderBrandCheckException('closed'));
|
|||
|
|
}
|
|||
|
|
return this._closedPromise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
|
|||
|
|
*/
|
|||
|
|
cancel(reason = undefined) {
|
|||
|
|
if (!IsReadableStreamBYOBReader(this)) {
|
|||
|
|
return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
|
|||
|
|
}
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('cancel'));
|
|||
|
|
}
|
|||
|
|
return ReadableStreamReaderGenericCancel(this, reason);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Attempts to reads bytes into view, and returns a promise resolved with the result.
|
|||
|
|
*
|
|||
|
|
* If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
|
|||
|
|
*/
|
|||
|
|
read(view) {
|
|||
|
|
if (!IsReadableStreamBYOBReader(this)) {
|
|||
|
|
return promiseRejectedWith(byobReaderBrandCheckException('read'));
|
|||
|
|
}
|
|||
|
|
if (!ArrayBuffer.isView(view)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('view must be an array buffer view'));
|
|||
|
|
}
|
|||
|
|
if (view.byteLength === 0) {
|
|||
|
|
return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
|
|||
|
|
}
|
|||
|
|
if (view.buffer.byteLength === 0) {
|
|||
|
|
return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
|
|||
|
|
}
|
|||
|
|
if (IsDetachedBuffer(view.buffer)) ;
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(readerLockException('read from'));
|
|||
|
|
}
|
|||
|
|
let resolvePromise;
|
|||
|
|
let rejectPromise;
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
resolvePromise = resolve;
|
|||
|
|
rejectPromise = reject;
|
|||
|
|
});
|
|||
|
|
const readIntoRequest = {
|
|||
|
|
_chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
|
|||
|
|
_closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
|
|||
|
|
_errorSteps: e => rejectPromise(e)
|
|||
|
|
};
|
|||
|
|
ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
|
|||
|
|
* If the associated stream is errored when the lock is released, the reader will appear errored in the same way
|
|||
|
|
* from now on; otherwise, the reader will appear closed.
|
|||
|
|
*
|
|||
|
|
* A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
|
|||
|
|
* the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
|
|||
|
|
* do so will throw a `TypeError` and leave the reader locked to the stream.
|
|||
|
|
*/
|
|||
|
|
releaseLock() {
|
|||
|
|
if (!IsReadableStreamBYOBReader(this)) {
|
|||
|
|
throw byobReaderBrandCheckException('releaseLock');
|
|||
|
|
}
|
|||
|
|
if (this._ownerReadableStream === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (this._readIntoRequests.length > 0) {
|
|||
|
|
throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
|
|||
|
|
}
|
|||
|
|
ReadableStreamReaderGenericRelease(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableStreamBYOBReader.prototype, {
|
|||
|
|
cancel: { enumerable: true },
|
|||
|
|
read: { enumerable: true },
|
|||
|
|
releaseLock: { enumerable: true },
|
|||
|
|
closed: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableStreamBYOBReader',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the readers.
|
|||
|
|
function IsReadableStreamBYOBReader(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableStreamBYOBReader;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
|
|||
|
|
const stream = reader._ownerReadableStream;
|
|||
|
|
stream._disturbed = true;
|
|||
|
|
if (stream._state === 'errored') {
|
|||
|
|
readIntoRequest._errorSteps(stream._storedError);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStreamBYOBReader.
|
|||
|
|
function byobReaderBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function ExtractHighWaterMark(strategy, defaultHWM) {
|
|||
|
|
const { highWaterMark } = strategy;
|
|||
|
|
if (highWaterMark === undefined) {
|
|||
|
|
return defaultHWM;
|
|||
|
|
}
|
|||
|
|
if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
|
|||
|
|
throw new RangeError('Invalid highWaterMark');
|
|||
|
|
}
|
|||
|
|
return highWaterMark;
|
|||
|
|
}
|
|||
|
|
function ExtractSizeAlgorithm(strategy) {
|
|||
|
|
const { size } = strategy;
|
|||
|
|
if (!size) {
|
|||
|
|
return () => 1;
|
|||
|
|
}
|
|||
|
|
return size;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertQueuingStrategy(init, context) {
|
|||
|
|
assertDictionary(init, context);
|
|||
|
|
const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
|
|||
|
|
const size = init === null || init === void 0 ? void 0 : init.size;
|
|||
|
|
return {
|
|||
|
|
highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
|
|||
|
|
size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function convertQueuingStrategySize(fn, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return chunk => convertUnrestrictedDouble(fn(chunk));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertUnderlyingSink(original, context) {
|
|||
|
|
assertDictionary(original, context);
|
|||
|
|
const abort = original === null || original === void 0 ? void 0 : original.abort;
|
|||
|
|
const close = original === null || original === void 0 ? void 0 : original.close;
|
|||
|
|
const start = original === null || original === void 0 ? void 0 : original.start;
|
|||
|
|
const type = original === null || original === void 0 ? void 0 : original.type;
|
|||
|
|
const write = original === null || original === void 0 ? void 0 : original.write;
|
|||
|
|
return {
|
|||
|
|
abort: abort === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
|
|||
|
|
close: close === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
|
|||
|
|
start: start === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
|
|||
|
|
write: write === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
|
|||
|
|
type
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSinkAbortCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (reason) => promiseCall(fn, original, [reason]);
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSinkCloseCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return () => promiseCall(fn, original, []);
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSinkStartCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (controller) => reflectCall(fn, original, [controller]);
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSinkWriteCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function assertWritableStream(x, context) {
|
|||
|
|
if (!IsWritableStream(x)) {
|
|||
|
|
throw new TypeError(`${context} is not a WritableStream.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function isAbortSignal(value) {
|
|||
|
|
if (typeof value !== 'object' || value === null) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
try {
|
|||
|
|
return typeof value.aborted === 'boolean';
|
|||
|
|
}
|
|||
|
|
catch (_a) {
|
|||
|
|
// AbortSignal.prototype.aborted throws if its brand check fails
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
const supportsAbortController = typeof AbortController === 'function';
|
|||
|
|
/**
|
|||
|
|
* Construct a new AbortController, if supported by the platform.
|
|||
|
|
*
|
|||
|
|
* @internal
|
|||
|
|
*/
|
|||
|
|
function createAbortController() {
|
|||
|
|
if (supportsAbortController) {
|
|||
|
|
return new AbortController();
|
|||
|
|
}
|
|||
|
|
return undefined;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* A writable stream represents a destination for data, into which you can write.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class WritableStream {
|
|||
|
|
constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
|
|||
|
|
if (rawUnderlyingSink === undefined) {
|
|||
|
|
rawUnderlyingSink = null;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
assertObject(rawUnderlyingSink, 'First parameter');
|
|||
|
|
}
|
|||
|
|
const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
|
|||
|
|
const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
|
|||
|
|
InitializeWritableStream(this);
|
|||
|
|
const type = underlyingSink.type;
|
|||
|
|
if (type !== undefined) {
|
|||
|
|
throw new RangeError('Invalid type is specified');
|
|||
|
|
}
|
|||
|
|
const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
|
|||
|
|
const highWaterMark = ExtractHighWaterMark(strategy, 1);
|
|||
|
|
SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns whether or not the writable stream is locked to a writer.
|
|||
|
|
*/
|
|||
|
|
get locked() {
|
|||
|
|
if (!IsWritableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$2('locked');
|
|||
|
|
}
|
|||
|
|
return IsWritableStreamLocked(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
|
|||
|
|
* immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
|
|||
|
|
* mechanism of the underlying sink.
|
|||
|
|
*
|
|||
|
|
* The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
|
|||
|
|
* that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
|
|||
|
|
* the stream) if the stream is currently locked.
|
|||
|
|
*/
|
|||
|
|
abort(reason = undefined) {
|
|||
|
|
if (!IsWritableStream(this)) {
|
|||
|
|
return promiseRejectedWith(streamBrandCheckException$2('abort'));
|
|||
|
|
}
|
|||
|
|
if (IsWritableStreamLocked(this)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
|
|||
|
|
}
|
|||
|
|
return WritableStreamAbort(this, reason);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
|
|||
|
|
* close behavior. During this time any further attempts to write will fail (without erroring the stream).
|
|||
|
|
*
|
|||
|
|
* The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
|
|||
|
|
* successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
|
|||
|
|
* a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
|
|||
|
|
*/
|
|||
|
|
close() {
|
|||
|
|
if (!IsWritableStream(this)) {
|
|||
|
|
return promiseRejectedWith(streamBrandCheckException$2('close'));
|
|||
|
|
}
|
|||
|
|
if (IsWritableStreamLocked(this)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
|
|||
|
|
}
|
|||
|
|
if (WritableStreamCloseQueuedOrInFlight(this)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
|
|||
|
|
}
|
|||
|
|
return WritableStreamClose(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
|
|||
|
|
* is locked, no other writer can be acquired until this one is released.
|
|||
|
|
*
|
|||
|
|
* This functionality is especially useful for creating abstractions that desire the ability to write to a stream
|
|||
|
|
* without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
|
|||
|
|
* the same time, which would cause the resulting written data to be unpredictable and probably useless.
|
|||
|
|
*/
|
|||
|
|
getWriter() {
|
|||
|
|
if (!IsWritableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$2('getWriter');
|
|||
|
|
}
|
|||
|
|
return AcquireWritableStreamDefaultWriter(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(WritableStream.prototype, {
|
|||
|
|
abort: { enumerable: true },
|
|||
|
|
close: { enumerable: true },
|
|||
|
|
getWriter: { enumerable: true },
|
|||
|
|
locked: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'WritableStream',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the WritableStream.
|
|||
|
|
function AcquireWritableStreamDefaultWriter(stream) {
|
|||
|
|
return new WritableStreamDefaultWriter(stream);
|
|||
|
|
}
|
|||
|
|
// Throws if and only if startAlgorithm throws.
|
|||
|
|
function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
|
|||
|
|
const stream = Object.create(WritableStream.prototype);
|
|||
|
|
InitializeWritableStream(stream);
|
|||
|
|
const controller = Object.create(WritableStreamDefaultController.prototype);
|
|||
|
|
SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
|
|||
|
|
return stream;
|
|||
|
|
}
|
|||
|
|
function InitializeWritableStream(stream) {
|
|||
|
|
stream._state = 'writable';
|
|||
|
|
// The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
|
|||
|
|
// 'erroring' or 'errored'. May be set to an undefined value.
|
|||
|
|
stream._storedError = undefined;
|
|||
|
|
stream._writer = undefined;
|
|||
|
|
// Initialize to undefined first because the constructor of the controller checks this
|
|||
|
|
// variable to validate the caller.
|
|||
|
|
stream._writableStreamController = undefined;
|
|||
|
|
// This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
|
|||
|
|
// producer without waiting for the queued writes to finish.
|
|||
|
|
stream._writeRequests = new SimpleQueue();
|
|||
|
|
// Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
|
|||
|
|
// them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
|
|||
|
|
stream._inFlightWriteRequest = undefined;
|
|||
|
|
// The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
|
|||
|
|
// has been detached.
|
|||
|
|
stream._closeRequest = undefined;
|
|||
|
|
// Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
|
|||
|
|
// from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
|
|||
|
|
stream._inFlightCloseRequest = undefined;
|
|||
|
|
// The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
|
|||
|
|
stream._pendingAbortRequest = undefined;
|
|||
|
|
// The backpressure signal set by the controller.
|
|||
|
|
stream._backpressure = false;
|
|||
|
|
}
|
|||
|
|
function IsWritableStream(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof WritableStream;
|
|||
|
|
}
|
|||
|
|
function IsWritableStreamLocked(stream) {
|
|||
|
|
if (stream._writer === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
function WritableStreamAbort(stream, reason) {
|
|||
|
|
var _a;
|
|||
|
|
if (stream._state === 'closed' || stream._state === 'errored') {
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
stream._writableStreamController._abortReason = reason;
|
|||
|
|
(_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
|
|||
|
|
// TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
|
|||
|
|
// but it doesn't know that signaling abort runs author code that might have changed the state.
|
|||
|
|
// Widen the type again by casting to WritableStreamState.
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'closed' || state === 'errored') {
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
if (stream._pendingAbortRequest !== undefined) {
|
|||
|
|
return stream._pendingAbortRequest._promise;
|
|||
|
|
}
|
|||
|
|
let wasAlreadyErroring = false;
|
|||
|
|
if (state === 'erroring') {
|
|||
|
|
wasAlreadyErroring = true;
|
|||
|
|
// reason will not be used, so don't keep a reference to it.
|
|||
|
|
reason = undefined;
|
|||
|
|
}
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
stream._pendingAbortRequest = {
|
|||
|
|
_promise: undefined,
|
|||
|
|
_resolve: resolve,
|
|||
|
|
_reject: reject,
|
|||
|
|
_reason: reason,
|
|||
|
|
_wasAlreadyErroring: wasAlreadyErroring
|
|||
|
|
};
|
|||
|
|
});
|
|||
|
|
stream._pendingAbortRequest._promise = promise;
|
|||
|
|
if (!wasAlreadyErroring) {
|
|||
|
|
WritableStreamStartErroring(stream, reason);
|
|||
|
|
}
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
function WritableStreamClose(stream) {
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'closed' || state === 'errored') {
|
|||
|
|
return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
|
|||
|
|
}
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
const closeRequest = {
|
|||
|
|
_resolve: resolve,
|
|||
|
|
_reject: reject
|
|||
|
|
};
|
|||
|
|
stream._closeRequest = closeRequest;
|
|||
|
|
});
|
|||
|
|
const writer = stream._writer;
|
|||
|
|
if (writer !== undefined && stream._backpressure && state === 'writable') {
|
|||
|
|
defaultWriterReadyPromiseResolve(writer);
|
|||
|
|
}
|
|||
|
|
WritableStreamDefaultControllerClose(stream._writableStreamController);
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
// WritableStream API exposed for controllers.
|
|||
|
|
function WritableStreamAddWriteRequest(stream) {
|
|||
|
|
const promise = newPromise((resolve, reject) => {
|
|||
|
|
const writeRequest = {
|
|||
|
|
_resolve: resolve,
|
|||
|
|
_reject: reject
|
|||
|
|
};
|
|||
|
|
stream._writeRequests.push(writeRequest);
|
|||
|
|
});
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
function WritableStreamDealWithRejection(stream, error) {
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'writable') {
|
|||
|
|
WritableStreamStartErroring(stream, error);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
WritableStreamFinishErroring(stream);
|
|||
|
|
}
|
|||
|
|
function WritableStreamStartErroring(stream, reason) {
|
|||
|
|
const controller = stream._writableStreamController;
|
|||
|
|
stream._state = 'erroring';
|
|||
|
|
stream._storedError = reason;
|
|||
|
|
const writer = stream._writer;
|
|||
|
|
if (writer !== undefined) {
|
|||
|
|
WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
|
|||
|
|
}
|
|||
|
|
if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
|
|||
|
|
WritableStreamFinishErroring(stream);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamFinishErroring(stream) {
|
|||
|
|
stream._state = 'errored';
|
|||
|
|
stream._writableStreamController[ErrorSteps]();
|
|||
|
|
const storedError = stream._storedError;
|
|||
|
|
stream._writeRequests.forEach(writeRequest => {
|
|||
|
|
writeRequest._reject(storedError);
|
|||
|
|
});
|
|||
|
|
stream._writeRequests = new SimpleQueue();
|
|||
|
|
if (stream._pendingAbortRequest === undefined) {
|
|||
|
|
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const abortRequest = stream._pendingAbortRequest;
|
|||
|
|
stream._pendingAbortRequest = undefined;
|
|||
|
|
if (abortRequest._wasAlreadyErroring) {
|
|||
|
|
abortRequest._reject(storedError);
|
|||
|
|
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
|
|||
|
|
uponPromise(promise, () => {
|
|||
|
|
abortRequest._resolve();
|
|||
|
|
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|||
|
|
}, (reason) => {
|
|||
|
|
abortRequest._reject(reason);
|
|||
|
|
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function WritableStreamFinishInFlightWrite(stream) {
|
|||
|
|
stream._inFlightWriteRequest._resolve(undefined);
|
|||
|
|
stream._inFlightWriteRequest = undefined;
|
|||
|
|
}
|
|||
|
|
function WritableStreamFinishInFlightWriteWithError(stream, error) {
|
|||
|
|
stream._inFlightWriteRequest._reject(error);
|
|||
|
|
stream._inFlightWriteRequest = undefined;
|
|||
|
|
WritableStreamDealWithRejection(stream, error);
|
|||
|
|
}
|
|||
|
|
function WritableStreamFinishInFlightClose(stream) {
|
|||
|
|
stream._inFlightCloseRequest._resolve(undefined);
|
|||
|
|
stream._inFlightCloseRequest = undefined;
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'erroring') {
|
|||
|
|
// The error was too late to do anything, so it is ignored.
|
|||
|
|
stream._storedError = undefined;
|
|||
|
|
if (stream._pendingAbortRequest !== undefined) {
|
|||
|
|
stream._pendingAbortRequest._resolve();
|
|||
|
|
stream._pendingAbortRequest = undefined;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
stream._state = 'closed';
|
|||
|
|
const writer = stream._writer;
|
|||
|
|
if (writer !== undefined) {
|
|||
|
|
defaultWriterClosedPromiseResolve(writer);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamFinishInFlightCloseWithError(stream, error) {
|
|||
|
|
stream._inFlightCloseRequest._reject(error);
|
|||
|
|
stream._inFlightCloseRequest = undefined;
|
|||
|
|
// Never execute sink abort() after sink close().
|
|||
|
|
if (stream._pendingAbortRequest !== undefined) {
|
|||
|
|
stream._pendingAbortRequest._reject(error);
|
|||
|
|
stream._pendingAbortRequest = undefined;
|
|||
|
|
}
|
|||
|
|
WritableStreamDealWithRejection(stream, error);
|
|||
|
|
}
|
|||
|
|
// TODO(ricea): Fix alphabetical order.
|
|||
|
|
function WritableStreamCloseQueuedOrInFlight(stream) {
|
|||
|
|
if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
function WritableStreamHasOperationMarkedInFlight(stream) {
|
|||
|
|
if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
function WritableStreamMarkCloseRequestInFlight(stream) {
|
|||
|
|
stream._inFlightCloseRequest = stream._closeRequest;
|
|||
|
|
stream._closeRequest = undefined;
|
|||
|
|
}
|
|||
|
|
function WritableStreamMarkFirstWriteRequestInFlight(stream) {
|
|||
|
|
stream._inFlightWriteRequest = stream._writeRequests.shift();
|
|||
|
|
}
|
|||
|
|
function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
|
|||
|
|
if (stream._closeRequest !== undefined) {
|
|||
|
|
stream._closeRequest._reject(stream._storedError);
|
|||
|
|
stream._closeRequest = undefined;
|
|||
|
|
}
|
|||
|
|
const writer = stream._writer;
|
|||
|
|
if (writer !== undefined) {
|
|||
|
|
defaultWriterClosedPromiseReject(writer, stream._storedError);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamUpdateBackpressure(stream, backpressure) {
|
|||
|
|
const writer = stream._writer;
|
|||
|
|
if (writer !== undefined && backpressure !== stream._backpressure) {
|
|||
|
|
if (backpressure) {
|
|||
|
|
defaultWriterReadyPromiseReset(writer);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
defaultWriterReadyPromiseResolve(writer);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
stream._backpressure = backpressure;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* A default writer vended by a {@link WritableStream}.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class WritableStreamDefaultWriter {
|
|||
|
|
constructor(stream) {
|
|||
|
|
assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
|
|||
|
|
assertWritableStream(stream, 'First parameter');
|
|||
|
|
if (IsWritableStreamLocked(stream)) {
|
|||
|
|
throw new TypeError('This stream has already been locked for exclusive writing by another writer');
|
|||
|
|
}
|
|||
|
|
this._ownerWritableStream = stream;
|
|||
|
|
stream._writer = this;
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'writable') {
|
|||
|
|
if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
|
|||
|
|
defaultWriterReadyPromiseInitialize(this);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
defaultWriterReadyPromiseInitializeAsResolved(this);
|
|||
|
|
}
|
|||
|
|
defaultWriterClosedPromiseInitialize(this);
|
|||
|
|
}
|
|||
|
|
else if (state === 'erroring') {
|
|||
|
|
defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
|
|||
|
|
defaultWriterClosedPromiseInitialize(this);
|
|||
|
|
}
|
|||
|
|
else if (state === 'closed') {
|
|||
|
|
defaultWriterReadyPromiseInitializeAsResolved(this);
|
|||
|
|
defaultWriterClosedPromiseInitializeAsResolved(this);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
const storedError = stream._storedError;
|
|||
|
|
defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
|
|||
|
|
defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
|
|||
|
|
* the writer’s lock is released before the stream finishes closing.
|
|||
|
|
*/
|
|||
|
|
get closed() {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
|
|||
|
|
}
|
|||
|
|
return this._closedPromise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
|
|||
|
|
* A producer can use this information to determine the right amount of data to write.
|
|||
|
|
*
|
|||
|
|
* It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
|
|||
|
|
* queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
|
|||
|
|
* the writer’s lock is released.
|
|||
|
|
*/
|
|||
|
|
get desiredSize() {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
throw defaultWriterBrandCheckException('desiredSize');
|
|||
|
|
}
|
|||
|
|
if (this._ownerWritableStream === undefined) {
|
|||
|
|
throw defaultWriterLockException('desiredSize');
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultWriterGetDesiredSize(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
|
|||
|
|
* from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
|
|||
|
|
* back to zero or below, the getter will return a new promise that stays pending until the next transition.
|
|||
|
|
*
|
|||
|
|
* If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
|
|||
|
|
* rejected.
|
|||
|
|
*/
|
|||
|
|
get ready() {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
|
|||
|
|
}
|
|||
|
|
return this._readyPromise;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
|
|||
|
|
*/
|
|||
|
|
abort(reason = undefined) {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
|
|||
|
|
}
|
|||
|
|
if (this._ownerWritableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(defaultWriterLockException('abort'));
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultWriterAbort(this, reason);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
|
|||
|
|
*/
|
|||
|
|
close() {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
return promiseRejectedWith(defaultWriterBrandCheckException('close'));
|
|||
|
|
}
|
|||
|
|
const stream = this._ownerWritableStream;
|
|||
|
|
if (stream === undefined) {
|
|||
|
|
return promiseRejectedWith(defaultWriterLockException('close'));
|
|||
|
|
}
|
|||
|
|
if (WritableStreamCloseQueuedOrInFlight(stream)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultWriterClose(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
|
|||
|
|
* If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
|
|||
|
|
* now on; otherwise, the writer will appear closed.
|
|||
|
|
*
|
|||
|
|
* Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
|
|||
|
|
* promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
|
|||
|
|
* It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
|
|||
|
|
* other producers from writing in an interleaved manner.
|
|||
|
|
*/
|
|||
|
|
releaseLock() {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
throw defaultWriterBrandCheckException('releaseLock');
|
|||
|
|
}
|
|||
|
|
const stream = this._ownerWritableStream;
|
|||
|
|
if (stream === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
WritableStreamDefaultWriterRelease(this);
|
|||
|
|
}
|
|||
|
|
write(chunk = undefined) {
|
|||
|
|
if (!IsWritableStreamDefaultWriter(this)) {
|
|||
|
|
return promiseRejectedWith(defaultWriterBrandCheckException('write'));
|
|||
|
|
}
|
|||
|
|
if (this._ownerWritableStream === undefined) {
|
|||
|
|
return promiseRejectedWith(defaultWriterLockException('write to'));
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultWriterWrite(this, chunk);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(WritableStreamDefaultWriter.prototype, {
|
|||
|
|
abort: { enumerable: true },
|
|||
|
|
close: { enumerable: true },
|
|||
|
|
releaseLock: { enumerable: true },
|
|||
|
|
write: { enumerable: true },
|
|||
|
|
closed: { enumerable: true },
|
|||
|
|
desiredSize: { enumerable: true },
|
|||
|
|
ready: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'WritableStreamDefaultWriter',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the WritableStreamDefaultWriter.
|
|||
|
|
function IsWritableStreamDefaultWriter(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof WritableStreamDefaultWriter;
|
|||
|
|
}
|
|||
|
|
// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
|
|||
|
|
function WritableStreamDefaultWriterAbort(writer, reason) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
return WritableStreamAbort(stream, reason);
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterClose(writer) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
return WritableStreamClose(stream);
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
if (state === 'errored') {
|
|||
|
|
return promiseRejectedWith(stream._storedError);
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultWriterClose(writer);
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
|
|||
|
|
if (writer._closedPromiseState === 'pending') {
|
|||
|
|
defaultWriterClosedPromiseReject(writer, error);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
defaultWriterClosedPromiseResetToRejected(writer, error);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
|
|||
|
|
if (writer._readyPromiseState === 'pending') {
|
|||
|
|
defaultWriterReadyPromiseReject(writer, error);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
defaultWriterReadyPromiseResetToRejected(writer, error);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterGetDesiredSize(writer) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'errored' || state === 'erroring') {
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterRelease(writer) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
|
|||
|
|
WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
|
|||
|
|
// The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
|
|||
|
|
// rejected until afterwards. This means that simply testing state will not work.
|
|||
|
|
WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
|
|||
|
|
stream._writer = undefined;
|
|||
|
|
writer._ownerWritableStream = undefined;
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultWriterWrite(writer, chunk) {
|
|||
|
|
const stream = writer._ownerWritableStream;
|
|||
|
|
const controller = stream._writableStreamController;
|
|||
|
|
const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
|
|||
|
|
if (stream !== writer._ownerWritableStream) {
|
|||
|
|
return promiseRejectedWith(defaultWriterLockException('write to'));
|
|||
|
|
}
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'errored') {
|
|||
|
|
return promiseRejectedWith(stream._storedError);
|
|||
|
|
}
|
|||
|
|
if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
|
|||
|
|
return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
|
|||
|
|
}
|
|||
|
|
if (state === 'erroring') {
|
|||
|
|
return promiseRejectedWith(stream._storedError);
|
|||
|
|
}
|
|||
|
|
const promise = WritableStreamAddWriteRequest(stream);
|
|||
|
|
WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
|
|||
|
|
return promise;
|
|||
|
|
}
|
|||
|
|
const closeSentinel = {};
|
|||
|
|
/**
|
|||
|
|
* Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class WritableStreamDefaultController {
|
|||
|
|
constructor() {
|
|||
|
|
throw new TypeError('Illegal constructor');
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
|
|||
|
|
*
|
|||
|
|
* @deprecated
|
|||
|
|
* This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
|
|||
|
|
* Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
|
|||
|
|
*/
|
|||
|
|
get abortReason() {
|
|||
|
|
if (!IsWritableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$2('abortReason');
|
|||
|
|
}
|
|||
|
|
return this._abortReason;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
|
|||
|
|
*/
|
|||
|
|
get signal() {
|
|||
|
|
if (!IsWritableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$2('signal');
|
|||
|
|
}
|
|||
|
|
if (this._abortController === undefined) {
|
|||
|
|
// Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
|
|||
|
|
// We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
|
|||
|
|
// so instead we only implement support for `signal` if we find a global `AbortController` constructor.
|
|||
|
|
throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
|
|||
|
|
}
|
|||
|
|
return this._abortController.signal;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
|
|||
|
|
*
|
|||
|
|
* This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
|
|||
|
|
* sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
|
|||
|
|
* normal lifecycle of interactions with the underlying sink.
|
|||
|
|
*/
|
|||
|
|
error(e = undefined) {
|
|||
|
|
if (!IsWritableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$2('error');
|
|||
|
|
}
|
|||
|
|
const state = this._controlledWritableStream._state;
|
|||
|
|
if (state !== 'writable') {
|
|||
|
|
// The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
|
|||
|
|
// just treat it as a no-op.
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
WritableStreamDefaultControllerError(this, e);
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[AbortSteps](reason) {
|
|||
|
|
const result = this._abortAlgorithm(reason);
|
|||
|
|
WritableStreamDefaultControllerClearAlgorithms(this);
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[ErrorSteps]() {
|
|||
|
|
ResetQueue(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(WritableStreamDefaultController.prototype, {
|
|||
|
|
abortReason: { enumerable: true },
|
|||
|
|
signal: { enumerable: true },
|
|||
|
|
error: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'WritableStreamDefaultController',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations implementing interface required by the WritableStream.
|
|||
|
|
function IsWritableStreamDefaultController(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof WritableStreamDefaultController;
|
|||
|
|
}
|
|||
|
|
function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
|
|||
|
|
controller._controlledWritableStream = stream;
|
|||
|
|
stream._writableStreamController = controller;
|
|||
|
|
// Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
|
|||
|
|
controller._queue = undefined;
|
|||
|
|
controller._queueTotalSize = undefined;
|
|||
|
|
ResetQueue(controller);
|
|||
|
|
controller._abortReason = undefined;
|
|||
|
|
controller._abortController = createAbortController();
|
|||
|
|
controller._started = false;
|
|||
|
|
controller._strategySizeAlgorithm = sizeAlgorithm;
|
|||
|
|
controller._strategyHWM = highWaterMark;
|
|||
|
|
controller._writeAlgorithm = writeAlgorithm;
|
|||
|
|
controller._closeAlgorithm = closeAlgorithm;
|
|||
|
|
controller._abortAlgorithm = abortAlgorithm;
|
|||
|
|
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
|
|||
|
|
WritableStreamUpdateBackpressure(stream, backpressure);
|
|||
|
|
const startResult = startAlgorithm();
|
|||
|
|
const startPromise = promiseResolvedWith(startResult);
|
|||
|
|
uponPromise(startPromise, () => {
|
|||
|
|
controller._started = true;
|
|||
|
|
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|||
|
|
}, r => {
|
|||
|
|
controller._started = true;
|
|||
|
|
WritableStreamDealWithRejection(stream, r);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
|
|||
|
|
const controller = Object.create(WritableStreamDefaultController.prototype);
|
|||
|
|
let startAlgorithm = () => undefined;
|
|||
|
|
let writeAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
let closeAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
let abortAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
if (underlyingSink.start !== undefined) {
|
|||
|
|
startAlgorithm = () => underlyingSink.start(controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingSink.write !== undefined) {
|
|||
|
|
writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingSink.close !== undefined) {
|
|||
|
|
closeAlgorithm = () => underlyingSink.close();
|
|||
|
|
}
|
|||
|
|
if (underlyingSink.abort !== undefined) {
|
|||
|
|
abortAlgorithm = reason => underlyingSink.abort(reason);
|
|||
|
|
}
|
|||
|
|
SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
|
|||
|
|
}
|
|||
|
|
// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
|
|||
|
|
function WritableStreamDefaultControllerClearAlgorithms(controller) {
|
|||
|
|
controller._writeAlgorithm = undefined;
|
|||
|
|
controller._closeAlgorithm = undefined;
|
|||
|
|
controller._abortAlgorithm = undefined;
|
|||
|
|
controller._strategySizeAlgorithm = undefined;
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerClose(controller) {
|
|||
|
|
EnqueueValueWithSize(controller, closeSentinel, 0);
|
|||
|
|
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
|
|||
|
|
try {
|
|||
|
|
return controller._strategySizeAlgorithm(chunk);
|
|||
|
|
}
|
|||
|
|
catch (chunkSizeE) {
|
|||
|
|
WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
|
|||
|
|
return 1;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerGetDesiredSize(controller) {
|
|||
|
|
return controller._strategyHWM - controller._queueTotalSize;
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
|
|||
|
|
try {
|
|||
|
|
EnqueueValueWithSize(controller, chunk, chunkSize);
|
|||
|
|
}
|
|||
|
|
catch (enqueueE) {
|
|||
|
|
WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const stream = controller._controlledWritableStream;
|
|||
|
|
if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
|
|||
|
|
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
|
|||
|
|
WritableStreamUpdateBackpressure(stream, backpressure);
|
|||
|
|
}
|
|||
|
|
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the WritableStreamDefaultController.
|
|||
|
|
function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
|
|||
|
|
const stream = controller._controlledWritableStream;
|
|||
|
|
if (!controller._started) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (stream._inFlightWriteRequest !== undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const state = stream._state;
|
|||
|
|
if (state === 'erroring') {
|
|||
|
|
WritableStreamFinishErroring(stream);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._queue.length === 0) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const value = PeekQueueValue(controller);
|
|||
|
|
if (value === closeSentinel) {
|
|||
|
|
WritableStreamDefaultControllerProcessClose(controller);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
WritableStreamDefaultControllerProcessWrite(controller, value);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
|
|||
|
|
if (controller._controlledWritableStream._state === 'writable') {
|
|||
|
|
WritableStreamDefaultControllerError(controller, error);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerProcessClose(controller) {
|
|||
|
|
const stream = controller._controlledWritableStream;
|
|||
|
|
WritableStreamMarkCloseRequestInFlight(stream);
|
|||
|
|
DequeueValue(controller);
|
|||
|
|
const sinkClosePromise = controller._closeAlgorithm();
|
|||
|
|
WritableStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
uponPromise(sinkClosePromise, () => {
|
|||
|
|
WritableStreamFinishInFlightClose(stream);
|
|||
|
|
}, reason => {
|
|||
|
|
WritableStreamFinishInFlightCloseWithError(stream, reason);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
|
|||
|
|
const stream = controller._controlledWritableStream;
|
|||
|
|
WritableStreamMarkFirstWriteRequestInFlight(stream);
|
|||
|
|
const sinkWritePromise = controller._writeAlgorithm(chunk);
|
|||
|
|
uponPromise(sinkWritePromise, () => {
|
|||
|
|
WritableStreamFinishInFlightWrite(stream);
|
|||
|
|
const state = stream._state;
|
|||
|
|
DequeueValue(controller);
|
|||
|
|
if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
|
|||
|
|
const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
|
|||
|
|
WritableStreamUpdateBackpressure(stream, backpressure);
|
|||
|
|
}
|
|||
|
|
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
|
|||
|
|
}, reason => {
|
|||
|
|
if (stream._state === 'writable') {
|
|||
|
|
WritableStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
}
|
|||
|
|
WritableStreamFinishInFlightWriteWithError(stream, reason);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function WritableStreamDefaultControllerGetBackpressure(controller) {
|
|||
|
|
const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
|
|||
|
|
return desiredSize <= 0;
|
|||
|
|
}
|
|||
|
|
// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
|
|||
|
|
function WritableStreamDefaultControllerError(controller, error) {
|
|||
|
|
const stream = controller._controlledWritableStream;
|
|||
|
|
WritableStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
WritableStreamStartErroring(stream, error);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the WritableStream.
|
|||
|
|
function streamBrandCheckException$2(name) {
|
|||
|
|
return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the WritableStreamDefaultController.
|
|||
|
|
function defaultControllerBrandCheckException$2(name) {
|
|||
|
|
return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the WritableStreamDefaultWriter.
|
|||
|
|
function defaultWriterBrandCheckException(name) {
|
|||
|
|
return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
|
|||
|
|
}
|
|||
|
|
function defaultWriterLockException(name) {
|
|||
|
|
return new TypeError('Cannot ' + name + ' a stream using a released writer');
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseInitialize(writer) {
|
|||
|
|
writer._closedPromise = newPromise((resolve, reject) => {
|
|||
|
|
writer._closedPromise_resolve = resolve;
|
|||
|
|
writer._closedPromise_reject = reject;
|
|||
|
|
writer._closedPromiseState = 'pending';
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
|
|||
|
|
defaultWriterClosedPromiseInitialize(writer);
|
|||
|
|
defaultWriterClosedPromiseReject(writer, reason);
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseInitializeAsResolved(writer) {
|
|||
|
|
defaultWriterClosedPromiseInitialize(writer);
|
|||
|
|
defaultWriterClosedPromiseResolve(writer);
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseReject(writer, reason) {
|
|||
|
|
if (writer._closedPromise_reject === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
setPromiseIsHandledToTrue(writer._closedPromise);
|
|||
|
|
writer._closedPromise_reject(reason);
|
|||
|
|
writer._closedPromise_resolve = undefined;
|
|||
|
|
writer._closedPromise_reject = undefined;
|
|||
|
|
writer._closedPromiseState = 'rejected';
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseResetToRejected(writer, reason) {
|
|||
|
|
defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
|
|||
|
|
}
|
|||
|
|
function defaultWriterClosedPromiseResolve(writer) {
|
|||
|
|
if (writer._closedPromise_resolve === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
writer._closedPromise_resolve(undefined);
|
|||
|
|
writer._closedPromise_resolve = undefined;
|
|||
|
|
writer._closedPromise_reject = undefined;
|
|||
|
|
writer._closedPromiseState = 'resolved';
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseInitialize(writer) {
|
|||
|
|
writer._readyPromise = newPromise((resolve, reject) => {
|
|||
|
|
writer._readyPromise_resolve = resolve;
|
|||
|
|
writer._readyPromise_reject = reject;
|
|||
|
|
});
|
|||
|
|
writer._readyPromiseState = 'pending';
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
|
|||
|
|
defaultWriterReadyPromiseInitialize(writer);
|
|||
|
|
defaultWriterReadyPromiseReject(writer, reason);
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseInitializeAsResolved(writer) {
|
|||
|
|
defaultWriterReadyPromiseInitialize(writer);
|
|||
|
|
defaultWriterReadyPromiseResolve(writer);
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseReject(writer, reason) {
|
|||
|
|
if (writer._readyPromise_reject === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
setPromiseIsHandledToTrue(writer._readyPromise);
|
|||
|
|
writer._readyPromise_reject(reason);
|
|||
|
|
writer._readyPromise_resolve = undefined;
|
|||
|
|
writer._readyPromise_reject = undefined;
|
|||
|
|
writer._readyPromiseState = 'rejected';
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseReset(writer) {
|
|||
|
|
defaultWriterReadyPromiseInitialize(writer);
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseResetToRejected(writer, reason) {
|
|||
|
|
defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
|
|||
|
|
}
|
|||
|
|
function defaultWriterReadyPromiseResolve(writer) {
|
|||
|
|
if (writer._readyPromise_resolve === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
writer._readyPromise_resolve(undefined);
|
|||
|
|
writer._readyPromise_resolve = undefined;
|
|||
|
|
writer._readyPromise_reject = undefined;
|
|||
|
|
writer._readyPromiseState = 'fulfilled';
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <reference lib="dom" />
|
|||
|
|
const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
|
|||
|
|
|
|||
|
|
/// <reference types="node" />
|
|||
|
|
function isDOMExceptionConstructor(ctor) {
|
|||
|
|
if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
try {
|
|||
|
|
new ctor();
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
catch (_a) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function createDOMExceptionPolyfill() {
|
|||
|
|
// eslint-disable-next-line no-shadow
|
|||
|
|
const ctor = function DOMException(message, name) {
|
|||
|
|
this.message = message || '';
|
|||
|
|
this.name = name || 'Error';
|
|||
|
|
if (Error.captureStackTrace) {
|
|||
|
|
Error.captureStackTrace(this, this.constructor);
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
ctor.prototype = Object.create(Error.prototype);
|
|||
|
|
Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
|
|||
|
|
return ctor;
|
|||
|
|
}
|
|||
|
|
// eslint-disable-next-line no-redeclare
|
|||
|
|
const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
|
|||
|
|
|
|||
|
|
function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
|
|||
|
|
const reader = AcquireReadableStreamDefaultReader(source);
|
|||
|
|
const writer = AcquireWritableStreamDefaultWriter(dest);
|
|||
|
|
source._disturbed = true;
|
|||
|
|
let shuttingDown = false;
|
|||
|
|
// This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
|
|||
|
|
let currentWrite = promiseResolvedWith(undefined);
|
|||
|
|
return newPromise((resolve, reject) => {
|
|||
|
|
let abortAlgorithm;
|
|||
|
|
if (signal !== undefined) {
|
|||
|
|
abortAlgorithm = () => {
|
|||
|
|
const error = new DOMException$1('Aborted', 'AbortError');
|
|||
|
|
const actions = [];
|
|||
|
|
if (!preventAbort) {
|
|||
|
|
actions.push(() => {
|
|||
|
|
if (dest._state === 'writable') {
|
|||
|
|
return WritableStreamAbort(dest, error);
|
|||
|
|
}
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
if (!preventCancel) {
|
|||
|
|
actions.push(() => {
|
|||
|
|
if (source._state === 'readable') {
|
|||
|
|
return ReadableStreamCancel(source, error);
|
|||
|
|
}
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
|
|||
|
|
};
|
|||
|
|
if (signal.aborted) {
|
|||
|
|
abortAlgorithm();
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
signal.addEventListener('abort', abortAlgorithm);
|
|||
|
|
}
|
|||
|
|
// Using reader and writer, read all chunks from this and write them to dest
|
|||
|
|
// - Backpressure must be enforced
|
|||
|
|
// - Shutdown must stop all activity
|
|||
|
|
function pipeLoop() {
|
|||
|
|
return newPromise((resolveLoop, rejectLoop) => {
|
|||
|
|
function next(done) {
|
|||
|
|
if (done) {
|
|||
|
|
resolveLoop();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
// Use `PerformPromiseThen` instead of `uponPromise` to avoid
|
|||
|
|
// adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
|
|||
|
|
PerformPromiseThen(pipeStep(), next, rejectLoop);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
next(false);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function pipeStep() {
|
|||
|
|
if (shuttingDown) {
|
|||
|
|
return promiseResolvedWith(true);
|
|||
|
|
}
|
|||
|
|
return PerformPromiseThen(writer._readyPromise, () => {
|
|||
|
|
return newPromise((resolveRead, rejectRead) => {
|
|||
|
|
ReadableStreamDefaultReaderRead(reader, {
|
|||
|
|
_chunkSteps: chunk => {
|
|||
|
|
currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
|
|||
|
|
resolveRead(false);
|
|||
|
|
},
|
|||
|
|
_closeSteps: () => resolveRead(true),
|
|||
|
|
_errorSteps: rejectRead
|
|||
|
|
});
|
|||
|
|
});
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Errors must be propagated forward
|
|||
|
|
isOrBecomesErrored(source, reader._closedPromise, storedError => {
|
|||
|
|
if (!preventAbort) {
|
|||
|
|
shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
shutdown(true, storedError);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
// Errors must be propagated backward
|
|||
|
|
isOrBecomesErrored(dest, writer._closedPromise, storedError => {
|
|||
|
|
if (!preventCancel) {
|
|||
|
|
shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
shutdown(true, storedError);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
// Closing must be propagated forward
|
|||
|
|
isOrBecomesClosed(source, reader._closedPromise, () => {
|
|||
|
|
if (!preventClose) {
|
|||
|
|
shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
shutdown();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
// Closing must be propagated backward
|
|||
|
|
if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
|
|||
|
|
const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
|
|||
|
|
if (!preventCancel) {
|
|||
|
|
shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
shutdown(true, destClosed);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
setPromiseIsHandledToTrue(pipeLoop());
|
|||
|
|
function waitForWritesToFinish() {
|
|||
|
|
// Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
|
|||
|
|
// for that too.
|
|||
|
|
const oldCurrentWrite = currentWrite;
|
|||
|
|
return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
|
|||
|
|
}
|
|||
|
|
function isOrBecomesErrored(stream, promise, action) {
|
|||
|
|
if (stream._state === 'errored') {
|
|||
|
|
action(stream._storedError);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
uponRejection(promise, action);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function isOrBecomesClosed(stream, promise, action) {
|
|||
|
|
if (stream._state === 'closed') {
|
|||
|
|
action();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
uponFulfillment(promise, action);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function shutdownWithAction(action, originalIsError, originalError) {
|
|||
|
|
if (shuttingDown) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
shuttingDown = true;
|
|||
|
|
if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
|
|||
|
|
uponFulfillment(waitForWritesToFinish(), doTheRest);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
doTheRest();
|
|||
|
|
}
|
|||
|
|
function doTheRest() {
|
|||
|
|
uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function shutdown(isError, error) {
|
|||
|
|
if (shuttingDown) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
shuttingDown = true;
|
|||
|
|
if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
|
|||
|
|
uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
finalize(isError, error);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function finalize(isError, error) {
|
|||
|
|
WritableStreamDefaultWriterRelease(writer);
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
if (signal !== undefined) {
|
|||
|
|
signal.removeEventListener('abort', abortAlgorithm);
|
|||
|
|
}
|
|||
|
|
if (isError) {
|
|||
|
|
reject(error);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
resolve(undefined);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableStreamDefaultController {
|
|||
|
|
constructor() {
|
|||
|
|
throw new TypeError('Illegal constructor');
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
|
|||
|
|
* over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
|
|||
|
|
*/
|
|||
|
|
get desiredSize() {
|
|||
|
|
if (!IsReadableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$1('desiredSize');
|
|||
|
|
}
|
|||
|
|
return ReadableStreamDefaultControllerGetDesiredSize(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
|
|||
|
|
* the stream, but once those are read, the stream will become closed.
|
|||
|
|
*/
|
|||
|
|
close() {
|
|||
|
|
if (!IsReadableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$1('close');
|
|||
|
|
}
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
|
|||
|
|
throw new TypeError('The stream is not in a state that permits close');
|
|||
|
|
}
|
|||
|
|
ReadableStreamDefaultControllerClose(this);
|
|||
|
|
}
|
|||
|
|
enqueue(chunk = undefined) {
|
|||
|
|
if (!IsReadableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$1('enqueue');
|
|||
|
|
}
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
|
|||
|
|
throw new TypeError('The stream is not in a state that permits enqueue');
|
|||
|
|
}
|
|||
|
|
return ReadableStreamDefaultControllerEnqueue(this, chunk);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
|
|||
|
|
*/
|
|||
|
|
error(e = undefined) {
|
|||
|
|
if (!IsReadableStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException$1('error');
|
|||
|
|
}
|
|||
|
|
ReadableStreamDefaultControllerError(this, e);
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[CancelSteps](reason) {
|
|||
|
|
ResetQueue(this);
|
|||
|
|
const result = this._cancelAlgorithm(reason);
|
|||
|
|
ReadableStreamDefaultControllerClearAlgorithms(this);
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
/** @internal */
|
|||
|
|
[PullSteps](readRequest) {
|
|||
|
|
const stream = this._controlledReadableStream;
|
|||
|
|
if (this._queue.length > 0) {
|
|||
|
|
const chunk = DequeueValue(this);
|
|||
|
|
if (this._closeRequested && this._queue.length === 0) {
|
|||
|
|
ReadableStreamDefaultControllerClearAlgorithms(this);
|
|||
|
|
ReadableStreamClose(stream);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableStreamDefaultControllerCallPullIfNeeded(this);
|
|||
|
|
}
|
|||
|
|
readRequest._chunkSteps(chunk);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
ReadableStreamAddReadRequest(stream, readRequest);
|
|||
|
|
ReadableStreamDefaultControllerCallPullIfNeeded(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableStreamDefaultController.prototype, {
|
|||
|
|
close: { enumerable: true },
|
|||
|
|
enqueue: { enumerable: true },
|
|||
|
|
error: { enumerable: true },
|
|||
|
|
desiredSize: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableStreamDefaultController',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the ReadableStreamDefaultController.
|
|||
|
|
function IsReadableStreamDefaultController(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableStreamDefaultController;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
|
|||
|
|
const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
|
|||
|
|
if (!shouldPull) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (controller._pulling) {
|
|||
|
|
controller._pullAgain = true;
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
controller._pulling = true;
|
|||
|
|
const pullPromise = controller._pullAlgorithm();
|
|||
|
|
uponPromise(pullPromise, () => {
|
|||
|
|
controller._pulling = false;
|
|||
|
|
if (controller._pullAgain) {
|
|||
|
|
controller._pullAgain = false;
|
|||
|
|
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
}, e => {
|
|||
|
|
ReadableStreamDefaultControllerError(controller, e);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerShouldCallPull(controller) {
|
|||
|
|
const stream = controller._controlledReadableStream;
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!controller._started) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
|
|||
|
|
if (desiredSize > 0) {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerClearAlgorithms(controller) {
|
|||
|
|
controller._pullAlgorithm = undefined;
|
|||
|
|
controller._cancelAlgorithm = undefined;
|
|||
|
|
controller._strategySizeAlgorithm = undefined;
|
|||
|
|
}
|
|||
|
|
// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
|
|||
|
|
function ReadableStreamDefaultControllerClose(controller) {
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const stream = controller._controlledReadableStream;
|
|||
|
|
controller._closeRequested = true;
|
|||
|
|
if (controller._queue.length === 0) {
|
|||
|
|
ReadableStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
ReadableStreamClose(stream);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
const stream = controller._controlledReadableStream;
|
|||
|
|
if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
|
|||
|
|
ReadableStreamFulfillReadRequest(stream, chunk, false);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
let chunkSize;
|
|||
|
|
try {
|
|||
|
|
chunkSize = controller._strategySizeAlgorithm(chunk);
|
|||
|
|
}
|
|||
|
|
catch (chunkSizeE) {
|
|||
|
|
ReadableStreamDefaultControllerError(controller, chunkSizeE);
|
|||
|
|
throw chunkSizeE;
|
|||
|
|
}
|
|||
|
|
try {
|
|||
|
|
EnqueueValueWithSize(controller, chunk, chunkSize);
|
|||
|
|
}
|
|||
|
|
catch (enqueueE) {
|
|||
|
|
ReadableStreamDefaultControllerError(controller, enqueueE);
|
|||
|
|
throw enqueueE;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerError(controller, e) {
|
|||
|
|
const stream = controller._controlledReadableStream;
|
|||
|
|
if (stream._state !== 'readable') {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
ResetQueue(controller);
|
|||
|
|
ReadableStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
ReadableStreamError(stream, e);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerGetDesiredSize(controller) {
|
|||
|
|
const state = controller._controlledReadableStream._state;
|
|||
|
|
if (state === 'errored') {
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
if (state === 'closed') {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
return controller._strategyHWM - controller._queueTotalSize;
|
|||
|
|
}
|
|||
|
|
// This is used in the implementation of TransformStream.
|
|||
|
|
function ReadableStreamDefaultControllerHasBackpressure(controller) {
|
|||
|
|
if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
|
|||
|
|
const state = controller._controlledReadableStream._state;
|
|||
|
|
if (!controller._closeRequested && state === 'readable') {
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
|
|||
|
|
controller._controlledReadableStream = stream;
|
|||
|
|
controller._queue = undefined;
|
|||
|
|
controller._queueTotalSize = undefined;
|
|||
|
|
ResetQueue(controller);
|
|||
|
|
controller._started = false;
|
|||
|
|
controller._closeRequested = false;
|
|||
|
|
controller._pullAgain = false;
|
|||
|
|
controller._pulling = false;
|
|||
|
|
controller._strategySizeAlgorithm = sizeAlgorithm;
|
|||
|
|
controller._strategyHWM = highWaterMark;
|
|||
|
|
controller._pullAlgorithm = pullAlgorithm;
|
|||
|
|
controller._cancelAlgorithm = cancelAlgorithm;
|
|||
|
|
stream._readableStreamController = controller;
|
|||
|
|
const startResult = startAlgorithm();
|
|||
|
|
uponPromise(promiseResolvedWith(startResult), () => {
|
|||
|
|
controller._started = true;
|
|||
|
|
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
|
|||
|
|
}, r => {
|
|||
|
|
ReadableStreamDefaultControllerError(controller, r);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
|
|||
|
|
const controller = Object.create(ReadableStreamDefaultController.prototype);
|
|||
|
|
let startAlgorithm = () => undefined;
|
|||
|
|
let pullAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
let cancelAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
if (underlyingSource.start !== undefined) {
|
|||
|
|
startAlgorithm = () => underlyingSource.start(controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingSource.pull !== undefined) {
|
|||
|
|
pullAlgorithm = () => underlyingSource.pull(controller);
|
|||
|
|
}
|
|||
|
|
if (underlyingSource.cancel !== undefined) {
|
|||
|
|
cancelAlgorithm = reason => underlyingSource.cancel(reason);
|
|||
|
|
}
|
|||
|
|
SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStreamDefaultController.
|
|||
|
|
function defaultControllerBrandCheckException$1(name) {
|
|||
|
|
return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function ReadableStreamTee(stream, cloneForBranch2) {
|
|||
|
|
if (IsReadableByteStreamController(stream._readableStreamController)) {
|
|||
|
|
return ReadableByteStreamTee(stream);
|
|||
|
|
}
|
|||
|
|
return ReadableStreamDefaultTee(stream);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamDefaultTee(stream, cloneForBranch2) {
|
|||
|
|
const reader = AcquireReadableStreamDefaultReader(stream);
|
|||
|
|
let reading = false;
|
|||
|
|
let readAgain = false;
|
|||
|
|
let canceled1 = false;
|
|||
|
|
let canceled2 = false;
|
|||
|
|
let reason1;
|
|||
|
|
let reason2;
|
|||
|
|
let branch1;
|
|||
|
|
let branch2;
|
|||
|
|
let resolveCancelPromise;
|
|||
|
|
const cancelPromise = newPromise(resolve => {
|
|||
|
|
resolveCancelPromise = resolve;
|
|||
|
|
});
|
|||
|
|
function pullAlgorithm() {
|
|||
|
|
if (reading) {
|
|||
|
|
readAgain = true;
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
reading = true;
|
|||
|
|
const readRequest = {
|
|||
|
|
_chunkSteps: chunk => {
|
|||
|
|
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
|
|||
|
|
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
|
|||
|
|
// successful synchronously-available reads get ahead of asynchronously-available errors.
|
|||
|
|
queueMicrotask(() => {
|
|||
|
|
readAgain = false;
|
|||
|
|
const chunk1 = chunk;
|
|||
|
|
const chunk2 = chunk;
|
|||
|
|
// There is no way to access the cloning code right now in the reference implementation.
|
|||
|
|
// If we add one then we'll need an implementation for serializable objects.
|
|||
|
|
// if (!canceled2 && cloneForBranch2) {
|
|||
|
|
// chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
|
|||
|
|
// }
|
|||
|
|
if (!canceled1) {
|
|||
|
|
ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
|
|||
|
|
}
|
|||
|
|
if (!canceled2) {
|
|||
|
|
ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
|
|||
|
|
}
|
|||
|
|
reading = false;
|
|||
|
|
if (readAgain) {
|
|||
|
|
pullAlgorithm();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
},
|
|||
|
|
_closeSteps: () => {
|
|||
|
|
reading = false;
|
|||
|
|
if (!canceled1) {
|
|||
|
|
ReadableStreamDefaultControllerClose(branch1._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (!canceled2) {
|
|||
|
|
ReadableStreamDefaultControllerClose(branch2._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (!canceled1 || !canceled2) {
|
|||
|
|
resolveCancelPromise(undefined);
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
_errorSteps: () => {
|
|||
|
|
reading = false;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
ReadableStreamDefaultReaderRead(reader, readRequest);
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
function cancel1Algorithm(reason) {
|
|||
|
|
canceled1 = true;
|
|||
|
|
reason1 = reason;
|
|||
|
|
if (canceled2) {
|
|||
|
|
const compositeReason = CreateArrayFromList([reason1, reason2]);
|
|||
|
|
const cancelResult = ReadableStreamCancel(stream, compositeReason);
|
|||
|
|
resolveCancelPromise(cancelResult);
|
|||
|
|
}
|
|||
|
|
return cancelPromise;
|
|||
|
|
}
|
|||
|
|
function cancel2Algorithm(reason) {
|
|||
|
|
canceled2 = true;
|
|||
|
|
reason2 = reason;
|
|||
|
|
if (canceled1) {
|
|||
|
|
const compositeReason = CreateArrayFromList([reason1, reason2]);
|
|||
|
|
const cancelResult = ReadableStreamCancel(stream, compositeReason);
|
|||
|
|
resolveCancelPromise(cancelResult);
|
|||
|
|
}
|
|||
|
|
return cancelPromise;
|
|||
|
|
}
|
|||
|
|
function startAlgorithm() {
|
|||
|
|
// do nothing
|
|||
|
|
}
|
|||
|
|
branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
|
|||
|
|
branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
|
|||
|
|
uponRejection(reader._closedPromise, (r) => {
|
|||
|
|
ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
|
|||
|
|
ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
|
|||
|
|
if (!canceled1 || !canceled2) {
|
|||
|
|
resolveCancelPromise(undefined);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
return [branch1, branch2];
|
|||
|
|
}
|
|||
|
|
function ReadableByteStreamTee(stream) {
|
|||
|
|
let reader = AcquireReadableStreamDefaultReader(stream);
|
|||
|
|
let reading = false;
|
|||
|
|
let readAgainForBranch1 = false;
|
|||
|
|
let readAgainForBranch2 = false;
|
|||
|
|
let canceled1 = false;
|
|||
|
|
let canceled2 = false;
|
|||
|
|
let reason1;
|
|||
|
|
let reason2;
|
|||
|
|
let branch1;
|
|||
|
|
let branch2;
|
|||
|
|
let resolveCancelPromise;
|
|||
|
|
const cancelPromise = newPromise(resolve => {
|
|||
|
|
resolveCancelPromise = resolve;
|
|||
|
|
});
|
|||
|
|
function forwardReaderError(thisReader) {
|
|||
|
|
uponRejection(thisReader._closedPromise, r => {
|
|||
|
|
if (thisReader !== reader) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerError(branch1._readableStreamController, r);
|
|||
|
|
ReadableByteStreamControllerError(branch2._readableStreamController, r);
|
|||
|
|
if (!canceled1 || !canceled2) {
|
|||
|
|
resolveCancelPromise(undefined);
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function pullWithDefaultReader() {
|
|||
|
|
if (IsReadableStreamBYOBReader(reader)) {
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
reader = AcquireReadableStreamDefaultReader(stream);
|
|||
|
|
forwardReaderError(reader);
|
|||
|
|
}
|
|||
|
|
const readRequest = {
|
|||
|
|
_chunkSteps: chunk => {
|
|||
|
|
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
|
|||
|
|
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
|
|||
|
|
// successful synchronously-available reads get ahead of asynchronously-available errors.
|
|||
|
|
queueMicrotask(() => {
|
|||
|
|
readAgainForBranch1 = false;
|
|||
|
|
readAgainForBranch2 = false;
|
|||
|
|
const chunk1 = chunk;
|
|||
|
|
let chunk2 = chunk;
|
|||
|
|
if (!canceled1 && !canceled2) {
|
|||
|
|
try {
|
|||
|
|
chunk2 = CloneAsUint8Array(chunk);
|
|||
|
|
}
|
|||
|
|
catch (cloneE) {
|
|||
|
|
ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
|
|||
|
|
ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
|
|||
|
|
resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if (!canceled1) {
|
|||
|
|
ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
|
|||
|
|
}
|
|||
|
|
if (!canceled2) {
|
|||
|
|
ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
|
|||
|
|
}
|
|||
|
|
reading = false;
|
|||
|
|
if (readAgainForBranch1) {
|
|||
|
|
pull1Algorithm();
|
|||
|
|
}
|
|||
|
|
else if (readAgainForBranch2) {
|
|||
|
|
pull2Algorithm();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
},
|
|||
|
|
_closeSteps: () => {
|
|||
|
|
reading = false;
|
|||
|
|
if (!canceled1) {
|
|||
|
|
ReadableByteStreamControllerClose(branch1._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (!canceled2) {
|
|||
|
|
ReadableByteStreamControllerClose(branch2._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (branch1._readableStreamController._pendingPullIntos.length > 0) {
|
|||
|
|
ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
|
|||
|
|
}
|
|||
|
|
if (branch2._readableStreamController._pendingPullIntos.length > 0) {
|
|||
|
|
ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
|
|||
|
|
}
|
|||
|
|
if (!canceled1 || !canceled2) {
|
|||
|
|
resolveCancelPromise(undefined);
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
_errorSteps: () => {
|
|||
|
|
reading = false;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
ReadableStreamDefaultReaderRead(reader, readRequest);
|
|||
|
|
}
|
|||
|
|
function pullWithBYOBReader(view, forBranch2) {
|
|||
|
|
if (IsReadableStreamDefaultReader(reader)) {
|
|||
|
|
ReadableStreamReaderGenericRelease(reader);
|
|||
|
|
reader = AcquireReadableStreamBYOBReader(stream);
|
|||
|
|
forwardReaderError(reader);
|
|||
|
|
}
|
|||
|
|
const byobBranch = forBranch2 ? branch2 : branch1;
|
|||
|
|
const otherBranch = forBranch2 ? branch1 : branch2;
|
|||
|
|
const readIntoRequest = {
|
|||
|
|
_chunkSteps: chunk => {
|
|||
|
|
// This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
|
|||
|
|
// reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
|
|||
|
|
// successful synchronously-available reads get ahead of asynchronously-available errors.
|
|||
|
|
queueMicrotask(() => {
|
|||
|
|
readAgainForBranch1 = false;
|
|||
|
|
readAgainForBranch2 = false;
|
|||
|
|
const byobCanceled = forBranch2 ? canceled2 : canceled1;
|
|||
|
|
const otherCanceled = forBranch2 ? canceled1 : canceled2;
|
|||
|
|
if (!otherCanceled) {
|
|||
|
|
let clonedChunk;
|
|||
|
|
try {
|
|||
|
|
clonedChunk = CloneAsUint8Array(chunk);
|
|||
|
|
}
|
|||
|
|
catch (cloneE) {
|
|||
|
|
ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
|
|||
|
|
ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
|
|||
|
|
resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
if (!byobCanceled) {
|
|||
|
|
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
|
|||
|
|
}
|
|||
|
|
ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
|
|||
|
|
}
|
|||
|
|
else if (!byobCanceled) {
|
|||
|
|
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
|
|||
|
|
}
|
|||
|
|
reading = false;
|
|||
|
|
if (readAgainForBranch1) {
|
|||
|
|
pull1Algorithm();
|
|||
|
|
}
|
|||
|
|
else if (readAgainForBranch2) {
|
|||
|
|
pull2Algorithm();
|
|||
|
|
}
|
|||
|
|
});
|
|||
|
|
},
|
|||
|
|
_closeSteps: chunk => {
|
|||
|
|
reading = false;
|
|||
|
|
const byobCanceled = forBranch2 ? canceled2 : canceled1;
|
|||
|
|
const otherCanceled = forBranch2 ? canceled1 : canceled2;
|
|||
|
|
if (!byobCanceled) {
|
|||
|
|
ReadableByteStreamControllerClose(byobBranch._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (!otherCanceled) {
|
|||
|
|
ReadableByteStreamControllerClose(otherBranch._readableStreamController);
|
|||
|
|
}
|
|||
|
|
if (chunk !== undefined) {
|
|||
|
|
if (!byobCanceled) {
|
|||
|
|
ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
|
|||
|
|
}
|
|||
|
|
if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
|
|||
|
|
ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
if (!byobCanceled || !otherCanceled) {
|
|||
|
|
resolveCancelPromise(undefined);
|
|||
|
|
}
|
|||
|
|
},
|
|||
|
|
_errorSteps: () => {
|
|||
|
|
reading = false;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
|
|||
|
|
}
|
|||
|
|
function pull1Algorithm() {
|
|||
|
|
if (reading) {
|
|||
|
|
readAgainForBranch1 = true;
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
reading = true;
|
|||
|
|
const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
|
|||
|
|
if (byobRequest === null) {
|
|||
|
|
pullWithDefaultReader();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
pullWithBYOBReader(byobRequest._view, false);
|
|||
|
|
}
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
function pull2Algorithm() {
|
|||
|
|
if (reading) {
|
|||
|
|
readAgainForBranch2 = true;
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
reading = true;
|
|||
|
|
const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
|
|||
|
|
if (byobRequest === null) {
|
|||
|
|
pullWithDefaultReader();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
pullWithBYOBReader(byobRequest._view, true);
|
|||
|
|
}
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
function cancel1Algorithm(reason) {
|
|||
|
|
canceled1 = true;
|
|||
|
|
reason1 = reason;
|
|||
|
|
if (canceled2) {
|
|||
|
|
const compositeReason = CreateArrayFromList([reason1, reason2]);
|
|||
|
|
const cancelResult = ReadableStreamCancel(stream, compositeReason);
|
|||
|
|
resolveCancelPromise(cancelResult);
|
|||
|
|
}
|
|||
|
|
return cancelPromise;
|
|||
|
|
}
|
|||
|
|
function cancel2Algorithm(reason) {
|
|||
|
|
canceled2 = true;
|
|||
|
|
reason2 = reason;
|
|||
|
|
if (canceled1) {
|
|||
|
|
const compositeReason = CreateArrayFromList([reason1, reason2]);
|
|||
|
|
const cancelResult = ReadableStreamCancel(stream, compositeReason);
|
|||
|
|
resolveCancelPromise(cancelResult);
|
|||
|
|
}
|
|||
|
|
return cancelPromise;
|
|||
|
|
}
|
|||
|
|
function startAlgorithm() {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
|
|||
|
|
branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
|
|||
|
|
forwardReaderError(reader);
|
|||
|
|
return [branch1, branch2];
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertUnderlyingDefaultOrByteSource(source, context) {
|
|||
|
|
assertDictionary(source, context);
|
|||
|
|
const original = source;
|
|||
|
|
const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
|
|||
|
|
const cancel = original === null || original === void 0 ? void 0 : original.cancel;
|
|||
|
|
const pull = original === null || original === void 0 ? void 0 : original.pull;
|
|||
|
|
const start = original === null || original === void 0 ? void 0 : original.start;
|
|||
|
|
const type = original === null || original === void 0 ? void 0 : original.type;
|
|||
|
|
return {
|
|||
|
|
autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
|
|||
|
|
cancel: cancel === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
|
|||
|
|
pull: pull === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
|
|||
|
|
start: start === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
|
|||
|
|
type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSourceCancelCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (reason) => promiseCall(fn, original, [reason]);
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSourcePullCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (controller) => promiseCall(fn, original, [controller]);
|
|||
|
|
}
|
|||
|
|
function convertUnderlyingSourceStartCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (controller) => reflectCall(fn, original, [controller]);
|
|||
|
|
}
|
|||
|
|
function convertReadableStreamType(type, context) {
|
|||
|
|
type = `${type}`;
|
|||
|
|
if (type !== 'bytes') {
|
|||
|
|
throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
|
|||
|
|
}
|
|||
|
|
return type;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertReaderOptions(options, context) {
|
|||
|
|
assertDictionary(options, context);
|
|||
|
|
const mode = options === null || options === void 0 ? void 0 : options.mode;
|
|||
|
|
return {
|
|||
|
|
mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function convertReadableStreamReaderMode(mode, context) {
|
|||
|
|
mode = `${mode}`;
|
|||
|
|
if (mode !== 'byob') {
|
|||
|
|
throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
|
|||
|
|
}
|
|||
|
|
return mode;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertIteratorOptions(options, context) {
|
|||
|
|
assertDictionary(options, context);
|
|||
|
|
const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
|
|||
|
|
return { preventCancel: Boolean(preventCancel) };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertPipeOptions(options, context) {
|
|||
|
|
assertDictionary(options, context);
|
|||
|
|
const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
|
|||
|
|
const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
|
|||
|
|
const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
|
|||
|
|
const signal = options === null || options === void 0 ? void 0 : options.signal;
|
|||
|
|
if (signal !== undefined) {
|
|||
|
|
assertAbortSignal(signal, `${context} has member 'signal' that`);
|
|||
|
|
}
|
|||
|
|
return {
|
|||
|
|
preventAbort: Boolean(preventAbort),
|
|||
|
|
preventCancel: Boolean(preventCancel),
|
|||
|
|
preventClose: Boolean(preventClose),
|
|||
|
|
signal
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function assertAbortSignal(signal, context) {
|
|||
|
|
if (!isAbortSignal(signal)) {
|
|||
|
|
throw new TypeError(`${context} is not an AbortSignal.`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertReadableWritablePair(pair, context) {
|
|||
|
|
assertDictionary(pair, context);
|
|||
|
|
const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
|
|||
|
|
assertRequiredField(readable, 'readable', 'ReadableWritablePair');
|
|||
|
|
assertReadableStream(readable, `${context} has member 'readable' that`);
|
|||
|
|
const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
|
|||
|
|
assertRequiredField(writable, 'writable', 'ReadableWritablePair');
|
|||
|
|
assertWritableStream(writable, `${context} has member 'writable' that`);
|
|||
|
|
return { readable, writable };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* A readable stream represents a source of data, from which you can read.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ReadableStream {
|
|||
|
|
constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
|
|||
|
|
if (rawUnderlyingSource === undefined) {
|
|||
|
|
rawUnderlyingSource = null;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
assertObject(rawUnderlyingSource, 'First parameter');
|
|||
|
|
}
|
|||
|
|
const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
|
|||
|
|
const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
|
|||
|
|
InitializeReadableStream(this);
|
|||
|
|
if (underlyingSource.type === 'bytes') {
|
|||
|
|
if (strategy.size !== undefined) {
|
|||
|
|
throw new RangeError('The strategy for a byte stream cannot have a size function');
|
|||
|
|
}
|
|||
|
|
const highWaterMark = ExtractHighWaterMark(strategy, 0);
|
|||
|
|
SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
|
|||
|
|
const highWaterMark = ExtractHighWaterMark(strategy, 1);
|
|||
|
|
SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
|
|||
|
|
*/
|
|||
|
|
get locked() {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$1('locked');
|
|||
|
|
}
|
|||
|
|
return IsReadableStreamLocked(this);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Cancels the stream, signaling a loss of interest in the stream by a consumer.
|
|||
|
|
*
|
|||
|
|
* The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
|
|||
|
|
* method, which might or might not use it.
|
|||
|
|
*/
|
|||
|
|
cancel(reason = undefined) {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
return promiseRejectedWith(streamBrandCheckException$1('cancel'));
|
|||
|
|
}
|
|||
|
|
if (IsReadableStreamLocked(this)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
|
|||
|
|
}
|
|||
|
|
return ReadableStreamCancel(this, reason);
|
|||
|
|
}
|
|||
|
|
getReader(rawOptions = undefined) {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$1('getReader');
|
|||
|
|
}
|
|||
|
|
const options = convertReaderOptions(rawOptions, 'First parameter');
|
|||
|
|
if (options.mode === undefined) {
|
|||
|
|
return AcquireReadableStreamDefaultReader(this);
|
|||
|
|
}
|
|||
|
|
return AcquireReadableStreamBYOBReader(this);
|
|||
|
|
}
|
|||
|
|
pipeThrough(rawTransform, rawOptions = {}) {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$1('pipeThrough');
|
|||
|
|
}
|
|||
|
|
assertRequiredArgument(rawTransform, 1, 'pipeThrough');
|
|||
|
|
const transform = convertReadableWritablePair(rawTransform, 'First parameter');
|
|||
|
|
const options = convertPipeOptions(rawOptions, 'Second parameter');
|
|||
|
|
if (IsReadableStreamLocked(this)) {
|
|||
|
|
throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
|
|||
|
|
}
|
|||
|
|
if (IsWritableStreamLocked(transform.writable)) {
|
|||
|
|
throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
|
|||
|
|
}
|
|||
|
|
const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
|
|||
|
|
setPromiseIsHandledToTrue(promise);
|
|||
|
|
return transform.readable;
|
|||
|
|
}
|
|||
|
|
pipeTo(destination, rawOptions = {}) {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
|
|||
|
|
}
|
|||
|
|
if (destination === undefined) {
|
|||
|
|
return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
|
|||
|
|
}
|
|||
|
|
if (!IsWritableStream(destination)) {
|
|||
|
|
return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
|
|||
|
|
}
|
|||
|
|
let options;
|
|||
|
|
try {
|
|||
|
|
options = convertPipeOptions(rawOptions, 'Second parameter');
|
|||
|
|
}
|
|||
|
|
catch (e) {
|
|||
|
|
return promiseRejectedWith(e);
|
|||
|
|
}
|
|||
|
|
if (IsReadableStreamLocked(this)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
|
|||
|
|
}
|
|||
|
|
if (IsWritableStreamLocked(destination)) {
|
|||
|
|
return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
|
|||
|
|
}
|
|||
|
|
return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Tees this readable stream, returning a two-element array containing the two resulting branches as
|
|||
|
|
* new {@link ReadableStream} instances.
|
|||
|
|
*
|
|||
|
|
* Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
|
|||
|
|
* To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
|
|||
|
|
* propagated to the stream's underlying source.
|
|||
|
|
*
|
|||
|
|
* Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
|
|||
|
|
* this could allow interference between the two branches.
|
|||
|
|
*/
|
|||
|
|
tee() {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$1('tee');
|
|||
|
|
}
|
|||
|
|
const branches = ReadableStreamTee(this);
|
|||
|
|
return CreateArrayFromList(branches);
|
|||
|
|
}
|
|||
|
|
values(rawOptions = undefined) {
|
|||
|
|
if (!IsReadableStream(this)) {
|
|||
|
|
throw streamBrandCheckException$1('values');
|
|||
|
|
}
|
|||
|
|
const options = convertIteratorOptions(rawOptions, 'First parameter');
|
|||
|
|
return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ReadableStream.prototype, {
|
|||
|
|
cancel: { enumerable: true },
|
|||
|
|
getReader: { enumerable: true },
|
|||
|
|
pipeThrough: { enumerable: true },
|
|||
|
|
pipeTo: { enumerable: true },
|
|||
|
|
tee: { enumerable: true },
|
|||
|
|
values: { enumerable: true },
|
|||
|
|
locked: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ReadableStream',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
|
|||
|
|
Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
|
|||
|
|
value: ReadableStream.prototype.values,
|
|||
|
|
writable: true,
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Abstract operations for the ReadableStream.
|
|||
|
|
// Throws if and only if startAlgorithm throws.
|
|||
|
|
function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
|
|||
|
|
const stream = Object.create(ReadableStream.prototype);
|
|||
|
|
InitializeReadableStream(stream);
|
|||
|
|
const controller = Object.create(ReadableStreamDefaultController.prototype);
|
|||
|
|
SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
|
|||
|
|
return stream;
|
|||
|
|
}
|
|||
|
|
// Throws if and only if startAlgorithm throws.
|
|||
|
|
function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
|
|||
|
|
const stream = Object.create(ReadableStream.prototype);
|
|||
|
|
InitializeReadableStream(stream);
|
|||
|
|
const controller = Object.create(ReadableByteStreamController.prototype);
|
|||
|
|
SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
|
|||
|
|
return stream;
|
|||
|
|
}
|
|||
|
|
function InitializeReadableStream(stream) {
|
|||
|
|
stream._state = 'readable';
|
|||
|
|
stream._reader = undefined;
|
|||
|
|
stream._storedError = undefined;
|
|||
|
|
stream._disturbed = false;
|
|||
|
|
}
|
|||
|
|
function IsReadableStream(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ReadableStream;
|
|||
|
|
}
|
|||
|
|
function IsReadableStreamLocked(stream) {
|
|||
|
|
if (stream._reader === undefined) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
// ReadableStream API exposed for controllers.
|
|||
|
|
function ReadableStreamCancel(stream, reason) {
|
|||
|
|
stream._disturbed = true;
|
|||
|
|
if (stream._state === 'closed') {
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
if (stream._state === 'errored') {
|
|||
|
|
return promiseRejectedWith(stream._storedError);
|
|||
|
|
}
|
|||
|
|
ReadableStreamClose(stream);
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
|
|||
|
|
reader._readIntoRequests.forEach(readIntoRequest => {
|
|||
|
|
readIntoRequest._closeSteps(undefined);
|
|||
|
|
});
|
|||
|
|
reader._readIntoRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
|
|||
|
|
return transformPromiseWith(sourceCancelPromise, noop);
|
|||
|
|
}
|
|||
|
|
function ReadableStreamClose(stream) {
|
|||
|
|
stream._state = 'closed';
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
if (reader === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
defaultReaderClosedPromiseResolve(reader);
|
|||
|
|
if (IsReadableStreamDefaultReader(reader)) {
|
|||
|
|
reader._readRequests.forEach(readRequest => {
|
|||
|
|
readRequest._closeSteps();
|
|||
|
|
});
|
|||
|
|
reader._readRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function ReadableStreamError(stream, e) {
|
|||
|
|
stream._state = 'errored';
|
|||
|
|
stream._storedError = e;
|
|||
|
|
const reader = stream._reader;
|
|||
|
|
if (reader === undefined) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
defaultReaderClosedPromiseReject(reader, e);
|
|||
|
|
if (IsReadableStreamDefaultReader(reader)) {
|
|||
|
|
reader._readRequests.forEach(readRequest => {
|
|||
|
|
readRequest._errorSteps(e);
|
|||
|
|
});
|
|||
|
|
reader._readRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
reader._readIntoRequests.forEach(readIntoRequest => {
|
|||
|
|
readIntoRequest._errorSteps(e);
|
|||
|
|
});
|
|||
|
|
reader._readIntoRequests = new SimpleQueue();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ReadableStream.
|
|||
|
|
function streamBrandCheckException$1(name) {
|
|||
|
|
return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertQueuingStrategyInit(init, context) {
|
|||
|
|
assertDictionary(init, context);
|
|||
|
|
const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
|
|||
|
|
assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
|
|||
|
|
return {
|
|||
|
|
highWaterMark: convertUnrestrictedDouble(highWaterMark)
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// The size function must not have a prototype property nor be a constructor
|
|||
|
|
const byteLengthSizeFunction = (chunk) => {
|
|||
|
|
return chunk.byteLength;
|
|||
|
|
};
|
|||
|
|
try {
|
|||
|
|
Object.defineProperty(byteLengthSizeFunction, 'name', {
|
|||
|
|
value: 'size',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
catch (_a) {
|
|||
|
|
// This property is non-configurable in older browsers, so ignore if this throws.
|
|||
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* A queuing strategy that counts the number of bytes in each chunk.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class ByteLengthQueuingStrategy {
|
|||
|
|
constructor(options) {
|
|||
|
|
assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
|
|||
|
|
options = convertQueuingStrategyInit(options, 'First parameter');
|
|||
|
|
this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the high water mark provided to the constructor.
|
|||
|
|
*/
|
|||
|
|
get highWaterMark() {
|
|||
|
|
if (!IsByteLengthQueuingStrategy(this)) {
|
|||
|
|
throw byteLengthBrandCheckException('highWaterMark');
|
|||
|
|
}
|
|||
|
|
return this._byteLengthQueuingStrategyHighWaterMark;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Measures the size of `chunk` by returning the value of its `byteLength` property.
|
|||
|
|
*/
|
|||
|
|
get size() {
|
|||
|
|
if (!IsByteLengthQueuingStrategy(this)) {
|
|||
|
|
throw byteLengthBrandCheckException('size');
|
|||
|
|
}
|
|||
|
|
return byteLengthSizeFunction;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
|
|||
|
|
highWaterMark: { enumerable: true },
|
|||
|
|
size: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'ByteLengthQueuingStrategy',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Helper functions for the ByteLengthQueuingStrategy.
|
|||
|
|
function byteLengthBrandCheckException(name) {
|
|||
|
|
return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
|
|||
|
|
}
|
|||
|
|
function IsByteLengthQueuingStrategy(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof ByteLengthQueuingStrategy;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// The size function must not have a prototype property nor be a constructor
|
|||
|
|
const countSizeFunction = () => {
|
|||
|
|
return 1;
|
|||
|
|
};
|
|||
|
|
try {
|
|||
|
|
Object.defineProperty(countSizeFunction, 'name', {
|
|||
|
|
value: 'size',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
catch (_a) {
|
|||
|
|
// This property is non-configurable in older browsers, so ignore if this throws.
|
|||
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* A queuing strategy that counts the number of chunks.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class CountQueuingStrategy {
|
|||
|
|
constructor(options) {
|
|||
|
|
assertRequiredArgument(options, 1, 'CountQueuingStrategy');
|
|||
|
|
options = convertQueuingStrategyInit(options, 'First parameter');
|
|||
|
|
this._countQueuingStrategyHighWaterMark = options.highWaterMark;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the high water mark provided to the constructor.
|
|||
|
|
*/
|
|||
|
|
get highWaterMark() {
|
|||
|
|
if (!IsCountQueuingStrategy(this)) {
|
|||
|
|
throw countBrandCheckException('highWaterMark');
|
|||
|
|
}
|
|||
|
|
return this._countQueuingStrategyHighWaterMark;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Measures the size of `chunk` by always returning 1.
|
|||
|
|
* This ensures that the total queue size is a count of the number of chunks in the queue.
|
|||
|
|
*/
|
|||
|
|
get size() {
|
|||
|
|
if (!IsCountQueuingStrategy(this)) {
|
|||
|
|
throw countBrandCheckException('size');
|
|||
|
|
}
|
|||
|
|
return countSizeFunction;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(CountQueuingStrategy.prototype, {
|
|||
|
|
highWaterMark: { enumerable: true },
|
|||
|
|
size: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'CountQueuingStrategy',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Helper functions for the CountQueuingStrategy.
|
|||
|
|
function countBrandCheckException(name) {
|
|||
|
|
return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
|
|||
|
|
}
|
|||
|
|
function IsCountQueuingStrategy(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof CountQueuingStrategy;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
function convertTransformer(original, context) {
|
|||
|
|
assertDictionary(original, context);
|
|||
|
|
const flush = original === null || original === void 0 ? void 0 : original.flush;
|
|||
|
|
const readableType = original === null || original === void 0 ? void 0 : original.readableType;
|
|||
|
|
const start = original === null || original === void 0 ? void 0 : original.start;
|
|||
|
|
const transform = original === null || original === void 0 ? void 0 : original.transform;
|
|||
|
|
const writableType = original === null || original === void 0 ? void 0 : original.writableType;
|
|||
|
|
return {
|
|||
|
|
flush: flush === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
|
|||
|
|
readableType,
|
|||
|
|
start: start === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
|
|||
|
|
transform: transform === undefined ?
|
|||
|
|
undefined :
|
|||
|
|
convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
|
|||
|
|
writableType
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
function convertTransformerFlushCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (controller) => promiseCall(fn, original, [controller]);
|
|||
|
|
}
|
|||
|
|
function convertTransformerStartCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (controller) => reflectCall(fn, original, [controller]);
|
|||
|
|
}
|
|||
|
|
function convertTransformerTransformCallback(fn, original, context) {
|
|||
|
|
assertFunction(fn, context);
|
|||
|
|
return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// Class TransformStream
|
|||
|
|
/**
|
|||
|
|
* A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
|
|||
|
|
* known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
|
|||
|
|
* In a manner specific to the transform stream in question, writes to the writable side result in new data being
|
|||
|
|
* made available for reading from the readable side.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class TransformStream {
|
|||
|
|
constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
|
|||
|
|
if (rawTransformer === undefined) {
|
|||
|
|
rawTransformer = null;
|
|||
|
|
}
|
|||
|
|
const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
|
|||
|
|
const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
|
|||
|
|
const transformer = convertTransformer(rawTransformer, 'First parameter');
|
|||
|
|
if (transformer.readableType !== undefined) {
|
|||
|
|
throw new RangeError('Invalid readableType specified');
|
|||
|
|
}
|
|||
|
|
if (transformer.writableType !== undefined) {
|
|||
|
|
throw new RangeError('Invalid writableType specified');
|
|||
|
|
}
|
|||
|
|
const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
|
|||
|
|
const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
|
|||
|
|
const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
|
|||
|
|
const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
|
|||
|
|
let startPromise_resolve;
|
|||
|
|
const startPromise = newPromise(resolve => {
|
|||
|
|
startPromise_resolve = resolve;
|
|||
|
|
});
|
|||
|
|
InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
|
|||
|
|
SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
|
|||
|
|
if (transformer.start !== undefined) {
|
|||
|
|
startPromise_resolve(transformer.start(this._transformStreamController));
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
startPromise_resolve(undefined);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* The readable side of the transform stream.
|
|||
|
|
*/
|
|||
|
|
get readable() {
|
|||
|
|
if (!IsTransformStream(this)) {
|
|||
|
|
throw streamBrandCheckException('readable');
|
|||
|
|
}
|
|||
|
|
return this._readable;
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* The writable side of the transform stream.
|
|||
|
|
*/
|
|||
|
|
get writable() {
|
|||
|
|
if (!IsTransformStream(this)) {
|
|||
|
|
throw streamBrandCheckException('writable');
|
|||
|
|
}
|
|||
|
|
return this._writable;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(TransformStream.prototype, {
|
|||
|
|
readable: { enumerable: true },
|
|||
|
|
writable: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'TransformStream',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
|
|||
|
|
function startAlgorithm() {
|
|||
|
|
return startPromise;
|
|||
|
|
}
|
|||
|
|
function writeAlgorithm(chunk) {
|
|||
|
|
return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
|
|||
|
|
}
|
|||
|
|
function abortAlgorithm(reason) {
|
|||
|
|
return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
|
|||
|
|
}
|
|||
|
|
function closeAlgorithm() {
|
|||
|
|
return TransformStreamDefaultSinkCloseAlgorithm(stream);
|
|||
|
|
}
|
|||
|
|
stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
|
|||
|
|
function pullAlgorithm() {
|
|||
|
|
return TransformStreamDefaultSourcePullAlgorithm(stream);
|
|||
|
|
}
|
|||
|
|
function cancelAlgorithm(reason) {
|
|||
|
|
TransformStreamErrorWritableAndUnblockWrite(stream, reason);
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
|
|||
|
|
// The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
|
|||
|
|
stream._backpressure = undefined;
|
|||
|
|
stream._backpressureChangePromise = undefined;
|
|||
|
|
stream._backpressureChangePromise_resolve = undefined;
|
|||
|
|
TransformStreamSetBackpressure(stream, true);
|
|||
|
|
stream._transformStreamController = undefined;
|
|||
|
|
}
|
|||
|
|
function IsTransformStream(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof TransformStream;
|
|||
|
|
}
|
|||
|
|
// This is a no-op if both sides are already errored.
|
|||
|
|
function TransformStreamError(stream, e) {
|
|||
|
|
ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
|
|||
|
|
TransformStreamErrorWritableAndUnblockWrite(stream, e);
|
|||
|
|
}
|
|||
|
|
function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
|
|||
|
|
TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
|
|||
|
|
WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
|
|||
|
|
if (stream._backpressure) {
|
|||
|
|
// Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
|
|||
|
|
// cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
|
|||
|
|
// _backpressure is set.
|
|||
|
|
TransformStreamSetBackpressure(stream, false);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function TransformStreamSetBackpressure(stream, backpressure) {
|
|||
|
|
// Passes also when called during construction.
|
|||
|
|
if (stream._backpressureChangePromise !== undefined) {
|
|||
|
|
stream._backpressureChangePromise_resolve();
|
|||
|
|
}
|
|||
|
|
stream._backpressureChangePromise = newPromise(resolve => {
|
|||
|
|
stream._backpressureChangePromise_resolve = resolve;
|
|||
|
|
});
|
|||
|
|
stream._backpressure = backpressure;
|
|||
|
|
}
|
|||
|
|
// Class TransformStreamDefaultController
|
|||
|
|
/**
|
|||
|
|
* Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
|
|||
|
|
*
|
|||
|
|
* @public
|
|||
|
|
*/
|
|||
|
|
class TransformStreamDefaultController {
|
|||
|
|
constructor() {
|
|||
|
|
throw new TypeError('Illegal constructor');
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
|
|||
|
|
*/
|
|||
|
|
get desiredSize() {
|
|||
|
|
if (!IsTransformStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException('desiredSize');
|
|||
|
|
}
|
|||
|
|
const readableController = this._controlledTransformStream._readable._readableStreamController;
|
|||
|
|
return ReadableStreamDefaultControllerGetDesiredSize(readableController);
|
|||
|
|
}
|
|||
|
|
enqueue(chunk = undefined) {
|
|||
|
|
if (!IsTransformStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException('enqueue');
|
|||
|
|
}
|
|||
|
|
TransformStreamDefaultControllerEnqueue(this, chunk);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Errors both the readable side and the writable side of the controlled transform stream, making all future
|
|||
|
|
* interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
|
|||
|
|
*/
|
|||
|
|
error(reason = undefined) {
|
|||
|
|
if (!IsTransformStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException('error');
|
|||
|
|
}
|
|||
|
|
TransformStreamDefaultControllerError(this, reason);
|
|||
|
|
}
|
|||
|
|
/**
|
|||
|
|
* Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
|
|||
|
|
* transformer only needs to consume a portion of the chunks written to the writable side.
|
|||
|
|
*/
|
|||
|
|
terminate() {
|
|||
|
|
if (!IsTransformStreamDefaultController(this)) {
|
|||
|
|
throw defaultControllerBrandCheckException('terminate');
|
|||
|
|
}
|
|||
|
|
TransformStreamDefaultControllerTerminate(this);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Object.defineProperties(TransformStreamDefaultController.prototype, {
|
|||
|
|
enqueue: { enumerable: true },
|
|||
|
|
error: { enumerable: true },
|
|||
|
|
terminate: { enumerable: true },
|
|||
|
|
desiredSize: { enumerable: true }
|
|||
|
|
});
|
|||
|
|
if (typeof SymbolPolyfill.toStringTag === 'symbol') {
|
|||
|
|
Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
|
|||
|
|
value: 'TransformStreamDefaultController',
|
|||
|
|
configurable: true
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// Transform Stream Default Controller Abstract Operations
|
|||
|
|
function IsTransformStreamDefaultController(x) {
|
|||
|
|
if (!typeIsObject(x)) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
return x instanceof TransformStreamDefaultController;
|
|||
|
|
}
|
|||
|
|
function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
|
|||
|
|
controller._controlledTransformStream = stream;
|
|||
|
|
stream._transformStreamController = controller;
|
|||
|
|
controller._transformAlgorithm = transformAlgorithm;
|
|||
|
|
controller._flushAlgorithm = flushAlgorithm;
|
|||
|
|
}
|
|||
|
|
function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
|
|||
|
|
const controller = Object.create(TransformStreamDefaultController.prototype);
|
|||
|
|
let transformAlgorithm = (chunk) => {
|
|||
|
|
try {
|
|||
|
|
TransformStreamDefaultControllerEnqueue(controller, chunk);
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
catch (transformResultE) {
|
|||
|
|
return promiseRejectedWith(transformResultE);
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
let flushAlgorithm = () => promiseResolvedWith(undefined);
|
|||
|
|
if (transformer.transform !== undefined) {
|
|||
|
|
transformAlgorithm = chunk => transformer.transform(chunk, controller);
|
|||
|
|
}
|
|||
|
|
if (transformer.flush !== undefined) {
|
|||
|
|
flushAlgorithm = () => transformer.flush(controller);
|
|||
|
|
}
|
|||
|
|
SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultControllerClearAlgorithms(controller) {
|
|||
|
|
controller._transformAlgorithm = undefined;
|
|||
|
|
controller._flushAlgorithm = undefined;
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultControllerEnqueue(controller, chunk) {
|
|||
|
|
const stream = controller._controlledTransformStream;
|
|||
|
|
const readableController = stream._readable._readableStreamController;
|
|||
|
|
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
|
|||
|
|
throw new TypeError('Readable side is not in a state that permits enqueue');
|
|||
|
|
}
|
|||
|
|
// We throttle transform invocations based on the backpressure of the ReadableStream, but we still
|
|||
|
|
// accept TransformStreamDefaultControllerEnqueue() calls.
|
|||
|
|
try {
|
|||
|
|
ReadableStreamDefaultControllerEnqueue(readableController, chunk);
|
|||
|
|
}
|
|||
|
|
catch (e) {
|
|||
|
|
// This happens when readableStrategy.size() throws.
|
|||
|
|
TransformStreamErrorWritableAndUnblockWrite(stream, e);
|
|||
|
|
throw stream._readable._storedError;
|
|||
|
|
}
|
|||
|
|
const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
|
|||
|
|
if (backpressure !== stream._backpressure) {
|
|||
|
|
TransformStreamSetBackpressure(stream, true);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultControllerError(controller, e) {
|
|||
|
|
TransformStreamError(controller._controlledTransformStream, e);
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
|
|||
|
|
const transformPromise = controller._transformAlgorithm(chunk);
|
|||
|
|
return transformPromiseWith(transformPromise, undefined, r => {
|
|||
|
|
TransformStreamError(controller._controlledTransformStream, r);
|
|||
|
|
throw r;
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultControllerTerminate(controller) {
|
|||
|
|
const stream = controller._controlledTransformStream;
|
|||
|
|
const readableController = stream._readable._readableStreamController;
|
|||
|
|
ReadableStreamDefaultControllerClose(readableController);
|
|||
|
|
const error = new TypeError('TransformStream terminated');
|
|||
|
|
TransformStreamErrorWritableAndUnblockWrite(stream, error);
|
|||
|
|
}
|
|||
|
|
// TransformStreamDefaultSink Algorithms
|
|||
|
|
function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
|
|||
|
|
const controller = stream._transformStreamController;
|
|||
|
|
if (stream._backpressure) {
|
|||
|
|
const backpressureChangePromise = stream._backpressureChangePromise;
|
|||
|
|
return transformPromiseWith(backpressureChangePromise, () => {
|
|||
|
|
const writable = stream._writable;
|
|||
|
|
const state = writable._state;
|
|||
|
|
if (state === 'erroring') {
|
|||
|
|
throw writable._storedError;
|
|||
|
|
}
|
|||
|
|
return TransformStreamDefaultControllerPerformTransform(controller, chunk);
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
return TransformStreamDefaultControllerPerformTransform(controller, chunk);
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
|
|||
|
|
// abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
|
|||
|
|
// errored.
|
|||
|
|
TransformStreamError(stream, reason);
|
|||
|
|
return promiseResolvedWith(undefined);
|
|||
|
|
}
|
|||
|
|
function TransformStreamDefaultSinkCloseAlgorithm(stream) {
|
|||
|
|
// stream._readable cannot change after construction, so caching it across a call to user code is safe.
|
|||
|
|
const readable = stream._readable;
|
|||
|
|
const controller = stream._transformStreamController;
|
|||
|
|
const flushPromise = controller._flushAlgorithm();
|
|||
|
|
TransformStreamDefaultControllerClearAlgorithms(controller);
|
|||
|
|
// Return a promise that is fulfilled with undefined on success.
|
|||
|
|
return transformPromiseWith(flushPromise, () => {
|
|||
|
|
if (readable._state === 'errored') {
|
|||
|
|
throw readable._storedError;
|
|||
|
|
}
|
|||
|
|
ReadableStreamDefaultControllerClose(readable._readableStreamController);
|
|||
|
|
}, r => {
|
|||
|
|
TransformStreamError(stream, r);
|
|||
|
|
throw readable._storedError;
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
// TransformStreamDefaultSource Algorithms
|
|||
|
|
function TransformStreamDefaultSourcePullAlgorithm(stream) {
|
|||
|
|
// Invariant. Enforced by the promises returned by start() and pull().
|
|||
|
|
TransformStreamSetBackpressure(stream, false);
|
|||
|
|
// Prevent the next pull() call until there is backpressure.
|
|||
|
|
return stream._backpressureChangePromise;
|
|||
|
|
}
|
|||
|
|
// Helper functions for the TransformStreamDefaultController.
|
|||
|
|
function defaultControllerBrandCheckException(name) {
|
|||
|
|
return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
|
|||
|
|
}
|
|||
|
|
// Helper functions for the TransformStream.
|
|||
|
|
function streamBrandCheckException(name) {
|
|||
|
|
return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
|
|||
|
|
exports.CountQueuingStrategy = CountQueuingStrategy;
|
|||
|
|
exports.ReadableByteStreamController = ReadableByteStreamController;
|
|||
|
|
exports.ReadableStream = ReadableStream;
|
|||
|
|
exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
|
|||
|
|
exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
|
|||
|
|
exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
|
|||
|
|
exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
|
|||
|
|
exports.TransformStream = TransformStream;
|
|||
|
|
exports.TransformStreamDefaultController = TransformStreamDefaultController;
|
|||
|
|
exports.WritableStream = WritableStream;
|
|||
|
|
exports.WritableStreamDefaultController = WritableStreamDefaultController;
|
|||
|
|
exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
|
|||
|
|
|
|||
|
|
Object.defineProperty(exports, '__esModule', { value: true });
|
|||
|
|
|
|||
|
|
})));
|
|||
|
|
//# sourceMappingURL=ponyfill.es2018.js.map
|