@CommonOperationsU­
(function(global, binding, v8) {
'use strict';
const _queue = v8.createPrivateSymbol('[[queue]]');
const _queueTotalSize = v8.createPrivateSymbol('[[queueTotalSize]]');
const _isSettled = v8.createPrivateSymbol('isSettled');
const Boolean = global.Boolean;
const Number = global.Number;
const Number_isFinite = Number.isFinite;
const Number_isNaN = Number.isNaN;
const RangeError = global.RangeError;
const TypeError = global.TypeError;
const TypeError_prototype = TypeError.prototype;
const hasOwnProperty = v8.uncurryThis(global.Object.hasOwnProperty);
const getPrototypeOf = global.Object.getPrototypeOf.bind(global.Object);
const getOwnPropertyDescriptor =
global.Object.getOwnPropertyDescriptor.bind(global.Object);
const thenPromise = v8.uncurryThis(Promise.prototype.then);
const JSON_parse = global.JSON.parse.bind(global.JSON);
const JSON_stringify = global.JSON.stringify.bind(global.JSON);
function hasOwnPropertyNoThrow(x, property) {
return Boolean(x) && hasOwnProperty(x, property);
}
function streamInternalError() {
throw new RangeError('Stream API Internal Error');
}
function createPromise() {
const p = v8.createPromise();
p[_isSettled] = false;
return p;
}
function rejectPromise(p, reason) {
if (!v8.isPromise(p)) {
streamInternalError();
}
if (p[_isSettled] !== false) {
return;
}
p[_isSettled] = true;
v8.rejectPromise(p, reason);
}
function createRejectedPromise(reason) {
const p = createPromise();
rejectPromise(p, reason);
return p;
}
function resolvePromise(p, value) {
if (!v8.isPromise(p)) {
streamInternalError();
}
if (p[_isSettled] !== false) {
return;
}
p[_isSettled] = true;
v8.resolvePromise(p, value);
}
function createResolvedPromise(value) {
if (v8.isPromise(value)) {
return value;
}
const p = createPromise();
resolvePromise(p, value);
return p;
}
function markPromiseAsHandled(p) {
if (!v8.isPromise(p)) {
streamInternalError();
}
v8.markPromiseAsHandled(p);
}
function promiseState(p) {
if (!v8.isPromise(p)) {
streamInternalError();
}
return v8.promiseState(p);
}
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) {
size = Number(size);
if (!IsFiniteNonNegativeNumber(size)) {
throw new RangeError(binding.streamErrors.invalidSize);
}
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 binding.SimpleQueue();
container[_queueTotalSize] = 0;
}
function IsFiniteNonNegativeNumber(v) {
return Number_isFinite(v) && v >= 0;
}
function ValidateAndNormalizeHighWaterMark(highWaterMark) {
highWaterMark = Number(highWaterMark);
if (Number_isNaN(highWaterMark)) {
throw new RangeError(binding.streamErrors.invalidHWM);
}
if (highWaterMark < 0) {
throw new RangeError(binding.streamErrors.invalidHWM);
}
return highWaterMark;
}
function MakeSizeAlgorithmFromSizeFunction(size) {
if (size === undefined) {
return () => 1;
}
if (typeof size !== 'function') {
throw new TypeError(binding.streamErrors.sizeNotAFunction);
}
return size;
}
const callFunction = v8.uncurryThis(global.Function.prototype.call);
const errTmplMustBeFunctionOrUndefined = name =>
`${name} must be a function or undefined`;
const Function_bind = v8.uncurryThis(global.Function.prototype.bind);
function resolveMethod(O, P, nameForError) {
const method = O[P];
if (typeof method !== 'function' && typeof method !== 'undefined') {
throw new TypeError(errTmplMustBeFunctionOrUndefined(nameForError));
}
return method;
}
function CreateAlgorithmFromUnderlyingMethod(
underlyingObject, methodName, algoArgCount, methodNameForError) {
const method =
resolveMethod(underlyingObject, methodName, methodNameForError);
if (method === undefined) {
return () => createResolvedPromise();
}
if (algoArgCount === 0) {
return Function_bind(PromiseCall0, undefined, method, underlyingObject);
}
return Function_bind(PromiseCall1, undefined, method, underlyingObject);
}
function CreateAlgorithmFromUnderlyingMethodPassingController(
underlyingObject, methodName, algoArgCount, controller,
methodNameForError) {
const method =
resolveMethod(underlyingObject, methodName, methodNameForError);
if (method === undefined) {
return () => createResolvedPromise();
}
if (algoArgCount === 0) {
return Function_bind(
PromiseCall1, undefined, method, underlyingObject, controller);
}
return arg => PromiseCall2(method, underlyingObject, arg, controller);
}
function CallOrNoop1(O, P, arg0, nameForError) {
const method = resolveMethod(O, P, nameForError);
if (method === undefined) {
return undefined;
}
return callFunction(method, O, arg0);
}
function PromiseCall0(F, V) {
try {
return createResolvedPromise(callFunction(F, V));
} catch (e) {
return createRejectedPromise(e);
}
}
function PromiseCall1(F, V, arg0) {
try {
return createResolvedPromise(callFunction(F, V, arg0));
} catch (e) {
return createRejectedPromise(e);
}
}
function PromiseCall2(F, V, arg0, arg1) {
try {
return createResolvedPromise(callFunction(F, V, arg0, arg1));
} catch (e) {
return createRejectedPromise(e);
}
}
const kPull = 1;
const kCancel = 2;
const kChunk = 3;
const kClose = 4;
const kAbort = 5;
const kError = 6;
function isATypeError(object) {
return object !== null && getPrototypeOf(object) === TypeError_prototype;
}
function isADOMException(object) {
try {
callFunction(binding.DOMException_name_get, object);
return true;
} catch (e) {
return false;
}
}
function packReason(reason) {
switch (typeof reason) {
case 'string':
case 'number':
case 'boolean':
return {encoder: 'json', string: JSON_stringify(reason)};
case 'object':
try {
if (isATypeError(reason)) {
let message;
const descriptor = getOwnPropertyDescriptor(reason, 'message');
if (descriptor) {
message = descriptor.value;
if (typeof message !== 'string') {
message = undefined;
}
}
return {encoder: 'typeerror', string: message};
}
if (isADOMException(reason)) {
const message =
callFunction(binding.DOMException_message_get, reason);
const name = callFunction(binding.DOMException_name_get, reason);
return {
encoder: 'domexception',
string: JSON_stringify({message, name})
};
}
return {encoder: 'json', string: JSON_stringify(reason)};
} catch (e) {
return {encoder: 'typeerror', string: 'Cannot transfer message'};
}
default:
return {encoder: 'undefined', string: undefined};
}
}
function unpackReason(packedReason) {
const {encoder, string} = packedReason;
switch (encoder) {
case 'json':
return JSON_parse(string);
case 'typeerror':
return new TypeError(string);
case 'domexception':
const {message, name} = JSON_parse(string);
return new binding.DOMException(message, name);
case 'undefined':
return undefined;
}
}
function CreateCrossRealmTransformWritable(port) {
let backpressurePromise = createPromise();
callFunction(binding.EventTarget_addEventListener, port, 'message', evt => {
const {type, value} = callFunction(binding.MessageEvent_data_get, evt);
switch (type) {
case kPull:
resolvePromise(backpressurePromise);
backpressurePromise = undefined;
break;
case kCancel:
case kError:
binding.WritableStreamDefaultControllerErrorIfNeeded(
controller, unpackReason(value));
if (backpressurePromise !== undefined) {
resolvePromise(backpressurePromise);
backpressurePromise = undefined;
}
break;
}
});
callFunction(
binding.EventTarget_addEventListener, port, 'messageerror', () => {
const error = new binding.DOMException('chunk could not be cloned',
'DataCloneError');
callFunction(binding.MessagePort_postMessage, port,
{type: kError, value: packReason(error)});
callFunction(binding.MessagePort_close, port);
binding.WritableStreamDefaultControllerErrorIfNeeded(controller,
error);
});
callFunction(binding.MessagePort_start, port);
function doWrite(chunk) {
backpressurePromise = createPromise();
try {
callFunction(
binding.MessagePort_postMessage, port,
{type: kChunk, value: chunk});
} catch (e) {
callFunction(
binding.MessagePort_postMessage, port,
{type: kError, value: packReason(e)});
callFunction(binding.MessagePort_close, port);
throw e;
}
}
const stream = binding.CreateWritableStream(
() => undefined,
chunk => {
if (!backpressurePromise) {
return PromiseCall1(doWrite, null, chunk);
}
return thenPromise(backpressurePromise, () => doWrite(chunk));
},
() => {
callFunction(
binding.MessagePort_postMessage, port,
{type: kClose, value: undefined});
callFunction(binding.MessagePort_close, port);
return createResolvedPromise();
},
reason => {
callFunction(
binding.MessagePort_postMessage, port,
{type: kAbort, value: packReason(reason)});
callFunction(binding.MessagePort_close, port);
return createResolvedPromise();
});
const controller = binding.getWritableStreamController(stream);
return stream;
}
function CreateCrossRealmTransformReadable(port) {
let backpressurePromise = createPromise();
let finished = false;
callFunction(binding.EventTarget_addEventListener, port, 'message', evt => {
const {type, value} = callFunction(binding.MessageEvent_data_get, evt);
if (finished) {
return;
}
switch (type) {
case kChunk:
binding.ReadableStreamDefaultControllerEnqueue(controller, value);
resolvePromise(backpressurePromise);
backpressurePromise = createPromise();
break;
case kClose:
finished = true;
binding.ReadableStreamDefaultControllerClose(controller);
callFunction(binding.MessagePort_close, port);
break;
case kAbort:
case kError:
finished = true;
binding.ReadableStreamDefaultControllerError(
controller, unpackReason(value));
callFunction(binding.MessagePort_close, port);
break;
}
});
callFunction(
binding.EventTarget_addEventListener, port, 'messageerror', () => {
const error = new binding.DOMException('chunk could not be cloned',
'DataCloneError');
callFunction(binding.MessagePort_postMessage, port,
{type: kError, value: packReason(error)});
callFunction(binding.MessagePort_close, port);
binding.ReadableStreamDefaultControllerError(controller, error);
});
callFunction(binding.MessagePort_start, port);
const stream = binding.CreateReadableStream(
() => undefined,
() => {
callFunction(
binding.MessagePort_postMessage, port,
{type: kPull, value: undefined});
return backpressurePromise;
},
reason => {
finished = true;
callFunction(
binding.MessagePort_postMessage, port,
{type: kCancel, value: packReason(reason)});
callFunction(binding.MessagePort_close, port);
return createResolvedPromise();
},
0);
const controller = binding.getReadableStreamController(stream);
return stream;
}
binding.streamOperations = {
_queue,
_queueTotalSize,
createPromise,
createRejectedPromise,
createResolvedPromise,
hasOwnPropertyNoThrow,
rejectPromise,
resolvePromise,
markPromiseAsHandled,
promiseState,
CreateAlgorithmFromUnderlyingMethod,
CreateAlgorithmFromUnderlyingMethodPassingController,
CreateCrossRealmTransformWritable,
CreateCrossRealmTransformReadable,
DequeueValue,
EnqueueValueWithSize,
PeekQueueValue,
ResetQueue,
ValidateAndNormalizeHighWaterMark,
MakeSizeAlgorithmFromSizeFunction,
CallOrNoop1,
PromiseCall2
};
});
4CommonStringså	
(function(global, binding, v8) {
'use strict';
binding.streamErrors = {
cannotTransferLockedStream: 'Cannot transfer a locked stream',
cannotTransferContext: 'Cannot transfer from this context',
illegalInvocation: 'Illegal invocation',
illegalConstructor: 'Illegal constructor',
invalidType: 'Invalid type is specified',
invalidSize: 'The return value of a queuing strategy\'s size function ' +
'must be a finite, non-NaN, non-negative number',
sizeNotAFunction: 'A queuing strategy\'s size property must be a function',
invalidHWM:
'A queueing strategy\'s highWaterMark property must be a nonnegative, ' +
'non-NaN number',
};
});
,SimpleQueueý 
(function(global, binding, v8) {
'use strict';
const _front = v8.createPrivateSymbol('front');
const _back = v8.createPrivateSymbol('back');
const _cursor = v8.createPrivateSymbol('cursor');
const _size = v8.createPrivateSymbol('size');
const _elements = v8.createPrivateSymbol('elements');
const _next = v8.createPrivateSymbol('next');
const RangeError = global.RangeError;
function requireNonEmptyQueue(queue, functionName) {
if (queue[_size] === 0) {
throw new RangeError(
`${functionName}() must not be called on an empty queue`);
}
}
const QUEUE_MAX_ARRAY_SIZE = 16384;
class SimpleQueue {
constructor() {
this[_front] = {
[_elements]: new v8.InternalPackedArray(),
[_next]: undefined,
};
this[_back] = this[_front];
this[_cursor] = 0;
this[_size] = 0;
}
get length() {
return this[_size];
}
push(element) {
const oldBack = this[_back];
let newBack = oldBack;
if (oldBack[_elements].length === QUEUE_MAX_ARRAY_SIZE - 1) {
newBack = {
[_elements]: new v8.InternalPackedArray(),
[_next]: undefined,
};
}
oldBack[_elements].push(element);
if (newBack !== oldBack) {
this[_back] = newBack;
oldBack[_next] = newBack;
}
++this[_size];
}
shift() {
requireNonEmptyQueue(this, 'shift');
const oldFront = this[_front];
let newFront = oldFront;
const oldCursor = this[_cursor];
let newCursor = oldCursor + 1;
const elements = oldFront[_elements];
const element = elements[oldCursor];
if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
newFront = oldFront[_next];
newCursor = 0;
}
--this[_size];
this[_cursor] = newCursor;
if (oldFront !== newFront) {
this[_front] = newFront;
}
elements[oldCursor] = undefined;
return element;
}
forEach(callback) {
let i = this[_cursor];
let node = this[_front];
let elements = node[_elements];
while (i !== elements.length || node[_next] !== undefined) {
if (i === elements.length) {
node = node[_next];
elements = node[_elements];
i = 0;
if (elements.length === 0) {
break;
}
}
callback(elements[i]);
++i;
}
}
peek() {
requireNonEmptyQueue(this, 'peek');
const front = this[_front];
const cursor = this[_cursor];
return front[_elements][cursor];
}
}
binding.SimpleQueue = SimpleQueue;
});
dByteLengthQueuingStrategy�
(function(global, binding, v8) {
'use strict';
const defineProperty = global.Object.defineProperty;
class ByteLengthQueuingStrategy {
constructor(options) {
defineProperty(this, 'highWaterMark', {
value: options.highWaterMark,
enumerable: true,
configurable: true,
writable: true
});
}
size(chunk) {
return chunk.byteLength;
}
}
defineProperty(global, 'ByteLengthQueuingStrategy', {
value: ByteLengthQueuingStrategy,
enumerable: false,
configurable: true,
writable: true
});
});
PCountQueuingStrategy

(function(global, binding, v8) {
'use strict';
const defineProperty = global.Object.defineProperty;
class CountQueuingStrategy {
constructor(options) {
defineProperty(this, 'highWaterMark', {
value: options.highWaterMark,
enumerable: true,
configurable: true,
writable: true
});
}
size() {
return 1;
}
}
defineProperty(global, 'CountQueuingStrategy', {
value: CountQueuingStrategy,
enumerable: false,
configurable: true,
writable: true
});
class BuiltInCountQueuingStrategy {
constructor(highWaterMark) {
defineProperty(this, 'highWaterMark', {value: highWaterMark});
}
size() {
return 1;
}
}
binding.createBuiltInCountQueuingStrategy = highWaterMark =>
new BuiltInCountQueuingStrategy(highWaterMark);
});
8ReadableStream¸

(function(global, binding, v8) {
'use strict';
const _reader = v8.createPrivateSymbol('[[reader]]');
const _storedError = v8.createPrivateSymbol('[[storedError]]');
const _controller = v8.createPrivateSymbol('[[controller]]');
const _closedPromise = v8.createPrivateSymbol('[[closedPromise]]');
const _ownerReadableStream =
v8.createPrivateSymbol('[[ownerReadableStream]]');
const _readRequests = v8.createPrivateSymbol('[[readRequests]]');
const createWithExternalControllerSentinel =
v8.createPrivateSymbol('flag for UA-created ReadableStream to pass');
const _readableStreamBits =
v8.createPrivateSymbol('bit field for [[state]] and [[disturbed]]');
const DISTURBED = 0b1;
const STATE_MASK = 0b110;
const STATE_BITS_OFFSET = 1;
const STATE_READABLE = 0;
const STATE_CLOSED = 1;
const STATE_ERRORED = 2;
const _controlledReadableStream =
v8.createPrivateSymbol('[[controlledReadableStream]]');
const _strategyHWM = v8.createPrivateSymbol('[[strategyHWM]]');
const _readableStreamDefaultControllerBits = v8.createPrivateSymbol(
'bit field for [[started]], [[closeRequested]], [[pulling]], ' +
'[[pullAgain]]');
const internalReadableStreamSymbol = v8.createPrivateSymbol(
'internal ReadableStream in exposed ReadableStream interface');
const _lockNotifyTarget = v8.createPrivateSymbol('[[lockNotifyTarget]]');
const _strategySizeAlgorithm = v8.createPrivateSymbol(
'[[strategySizeAlgorithm]]');
const _pullAlgorithm = v8.createPrivateSymbol('[[pullAlgorithm]]');
const _cancelAlgorithm = v8.createPrivateSymbol('[[cancelAlgorithm]]');
const STARTED = 0b1;
const CLOSE_REQUESTED = 0b10;
const PULLING = 0b100;
const PULL_AGAIN = 0b1000;
const BLINK_LOCK_NOTIFICATIONS = 0b10000;
const ObjectCreate = global.Object.create;
const callFunction = v8.uncurryThis(global.Function.prototype.call);
const applyFunction = v8.uncurryThis(global.Function.prototype.apply);
const TypeError = global.TypeError;
const RangeError = global.RangeError;
const String = global.String;
const Promise = global.Promise;
const thenPromise = v8.uncurryThis(Promise.prototype.then);
const {
_queue,
_queueTotalSize,
createPromise,
createRejectedPromise,
createResolvedPromise,
hasOwnPropertyNoThrow,
rejectPromise,
resolvePromise,
markPromiseAsHandled,
CallOrNoop1,
CreateAlgorithmFromUnderlyingMethod,
CreateAlgorithmFromUnderlyingMethodPassingController,
CreateCrossRealmTransformReadable,
CreateCrossRealmTransformWritable,
DequeueValue,
EnqueueValueWithSize,
MakeSizeAlgorithmFromSizeFunction,
ValidateAndNormalizeHighWaterMark,
} = binding.streamOperations;
const streamErrors = binding.streamErrors;
const errEnqueueCloseRequestedStream =
'Cannot enqueue a chunk into a readable stream that is closed or ' +
'has been requested to be closed';
const errCancelReleasedReader =
'This readable stream reader has been released and cannot be used ' +
'to cancel its previous owner stream';
const errReadReleasedReader =
'This readable stream reader has been released and cannot be used ' +
'to read from its previous owner stream';
const errCloseCloseRequestedStream =
'Cannot close a readable stream that has already been requested to ' +
'be closed';
const errEnqueueClosedStream =
'Cannot enqueue a chunk into a closed readable stream';
const errEnqueueErroredStream =
'Cannot enqueue a chunk into an errored readable stream';
const errCloseClosedStream = 'Cannot close a closed readable stream';
const errCloseErroredStream = 'Cannot close an errored readable stream';
const errReaderConstructorBadArgument =
'ReadableStreamReader constructor argument is not a readable stream';
const errReaderConstructorStreamAlreadyLocked =
'ReadableStreamReader constructor can only accept readable streams ' +
'that are not yet locked to a reader';
const errReleaseReaderWithPendingRead =
'Cannot release a readable stream reader when it still has ' +
'outstanding read() calls that have not yet settled';
const errReleasedReaderClosedPromise =
'This readable stream reader has been released and cannot be used ' +
'to monitor the stream\'s state';
const errDestinationStreamClosed = 'Destination stream closed';
let useCounted = false;
class ReadableStream {
constructor(underlyingSource = {}, strategy = {},
internalArgument = undefined) {
const enableBlinkLockNotifications =
internalArgument === createWithExternalControllerSentinel;
if (!useCounted && !enableBlinkLockNotifications) {
binding.countUse('ReadableStreamConstructor');
useCounted = true;
}
InitializeReadableStream(this);
const size = strategy.size;
let highWaterMark = strategy.highWaterMark;
const type = underlyingSource.type;
const typeString = String(type);
if (typeString === 'bytes') {
throw new RangeError('bytes type is not yet implemented');
}
if (type !== undefined) {
throw new RangeError(streamErrors.invalidType);
}
const sizeAlgorithm = MakeSizeAlgorithmFromSizeFunction(size);
if (highWaterMark === undefined) {
highWaterMark = 1;
}
highWaterMark = ValidateAndNormalizeHighWaterMark(highWaterMark);
SetUpReadableStreamDefaultControllerFromUnderlyingSource(
this, underlyingSource, highWaterMark, sizeAlgorithm,
enableBlinkLockNotifications);
}
}
const ReadableStream_prototype = ReadableStream.prototype;
function ReadableStreamPipeTo(
readable, dest, preventClose, preventAbort, preventCancel) {
const reader = AcquireReadableStreamDefaultReader(readable);
const writer = binding.AcquireWritableStreamDefaultWriter(dest);
let shuttingDown = false;
const promise = createPromise();
let reading = false;
let lastWrite;
if (checkInitialState()) {
thenPromise(reader[_closedPromise], onReaderClosed, readableError);
thenPromise(
binding.getWritableStreamDefaultWriterClosedPromise(writer),
undefined, writableError);
pump();
}
function checkInitialState() {
const state = ReadableStreamGetState(readable);
if (state === STATE_ERRORED) {
readableError(readable[_storedError]);
return false;
}
if (binding.isWritableStreamErrored(dest)) {
writableError(binding.getWritableStreamStoredError(dest));
return false;
}
if (state === STATE_CLOSED) {
readableClosed();
return false;
}
if (binding.isWritableStreamClosingOrClosed(dest)) {
writableStartedClosed();
return false;
}
return true;
}
function pump() {
if (shuttingDown) {
return;
}
const desiredSize =
binding.WritableStreamDefaultWriterGetDesiredSize(writer);
if (desiredSize === null) {
return;
}
if (desiredSize <= 0) {
thenPromise(
binding.getWritableStreamDefaultWriterReadyPromise(writer), pump,
writableError);
return;
}
reading = true;
thenPromise(
ReadableStreamDefaultReaderRead(reader), readFulfilled, readRejected);
}
function readFulfilled({value, done}) {
reading = false;
if (done) {
readableClosed();
return;
}
const write = binding.WritableStreamDefaultWriterWrite(writer, value);
lastWrite = write;
thenPromise(write, undefined, writableError);
pump();
}
function readRejected() {
reading = false;
readableError(readable[_storedError]);
}
function onReaderClosed() {
if (!reading) {
readableClosed();
}
}
function readableError(error) {
if (!preventAbort) {
shutdownWithAction(
binding.WritableStreamAbort, [dest, error], error, true);
} else {
shutdown(error, true);
}
}
function writableError(error) {
if (!preventCancel) {
shutdownWithAction(
ReadableStreamCancel, [readable, error], error, true);
} else {
shutdown(error, true);
}
}
function readableClosed() {
if (!preventClose) {
shutdownWithAction(
binding.WritableStreamDefaultWriterCloseWithErrorPropagation,
[writer]);
} else {
shutdown();
}
}
function writableStartedClosed() {
const destClosed = new TypeError(errDestinationStreamClosed);
if (!preventCancel) {
shutdownWithAction(
ReadableStreamCancel, [readable, destClosed], destClosed, true);
} else {
shutdown(destClosed, true);
}
}
function shutdownWithAction(
action, args, originalError = undefined, errorGiven = false) {
if (shuttingDown) {
return;
}
shuttingDown = true;
let p;
if (shouldWriteQueuedChunks()) {
p = thenPromise(writeQueuedChunks(),
() => applyFunction(action, undefined, args));
} else {
p = applyFunction(action, undefined, args);
}
thenPromise(
p, () => finalize(originalError, errorGiven),
newError => finalize(newError, true));
}
function shutdown(error = undefined, errorGiven = false) {
if (shuttingDown) {
return;
}
shuttingDown = true;
if (shouldWriteQueuedChunks()) {
thenPromise(writeQueuedChunks(), () => finalize(error, errorGiven));
} else {
finalize(error, errorGiven);
}
}
function finalize(error, errorGiven) {
binding.WritableStreamDefaultWriterRelease(writer);
ReadableStreamReaderGenericRelease(reader);
if (errorGiven) {
rejectPromise(promise, error);
} else {
resolvePromise(promise, undefined);
}
}
function shouldWriteQueuedChunks() {
return binding.isWritableStreamWritable(dest) &&
!binding.WritableStreamCloseQueuedOrInFlight(dest);
}
function writeQueuedChunks() {
if (lastWrite) {
return thenPromise(lastWrite, () => undefined, () => undefined);
}
return createResolvedPromise(undefined);
}
return promise;
}
function AcquireReadableStreamDefaultReader(stream) {
return new ReadableStreamDefaultReader(stream);
}
function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm,
highWaterMark, sizeAlgorithm,
enableBlinkLockNotifications) {
if (highWaterMark === undefined) {
highWaterMark = 1;
}
if (sizeAlgorithm === undefined) {
sizeAlgorithm = () => 1;
}
const stream = ObjectCreate(ReadableStream_prototype);
InitializeReadableStream(stream);
const controller = ObjectCreate(ReadableStreamDefaultController_prototype);
SetUpReadableStreamDefaultController(
stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm,
highWaterMark, sizeAlgorithm, enableBlinkLockNotifications);
return stream;
}
function InitializeReadableStream(stream) {
stream[_readableStreamBits] = 0b0;
ReadableStreamSetState(stream, STATE_READABLE);
stream[_reader] = undefined;
stream[_storedError] = undefined;
}
function IsReadableStream(x) {
return hasOwnPropertyNoThrow(x, _controller);
}
function IsReadableStreamDisturbed(stream) {
return stream[_readableStreamBits] & DISTURBED;
}
function IsReadableStreamLocked(stream) {
return stream[_reader] !== undefined;
}
function ReadableStreamTee(stream) {
const reader = AcquireReadableStreamDefaultReader(stream);
let closedOrErrored = false;
let canceled1 = false;
let canceled2 = false;
let reason1;
let reason2;
const cancelPromise = createPromise();
function pullAlgorithm() {
return thenPromise(
ReadableStreamDefaultReaderRead(reader), ({value, done}) => {
if (done && !closedOrErrored) {
if (!canceled1) {
ReadableStreamDefaultControllerClose(branch1controller);
}
if (!canceled2) {
ReadableStreamDefaultControllerClose(branch2controller);
}
closedOrErrored = true;
}
if (closedOrErrored) {
return;
}
if (!canceled1) {
ReadableStreamDefaultControllerEnqueue(branch1controller, value);
}
if (!canceled2) {
ReadableStreamDefaultControllerEnqueue(branch2controller, value);
}
});
}
function cancel1Algorithm(reason) {
canceled1 = true;
reason1 = reason;
if (canceled2) {
const cancelResult = ReadableStreamCancel(stream, [reason1, reason2]);
resolvePromise(cancelPromise, cancelResult);
}
return cancelPromise;
}
function cancel2Algorithm(reason) {
canceled2 = true;
reason2 = reason;
if (canceled1) {
const cancelResult = ReadableStreamCancel(stream, [reason1, reason2]);
resolvePromise(cancelPromise, cancelResult);
}
return cancelPromise;
}
const startAlgorithm = () => undefined;
const branch1Stream = CreateReadableStream(
startAlgorithm, pullAlgorithm, cancel1Algorithm, undefined, undefined,
false);
const branch2Stream = CreateReadableStream(
startAlgorithm, pullAlgorithm, cancel2Algorithm, undefined, undefined,
false);
const branch1controller = branch1Stream[_controller];
const branch2controller = branch2Stream[_controller];
thenPromise(reader[_closedPromise], undefined, r => {
if (closedOrErrored === true) {
return;
}
ReadableStreamDefaultControllerError(branch1controller, r);
ReadableStreamDefaultControllerError(branch2controller, r);
closedOrErrored = true;
});
return [branch1Stream, branch2Stream];
}
function ReadableStreamAddReadRequest(stream, forAuthorCode) {
const promise = createPromise();
stream[_reader][_readRequests].push({promise, forAuthorCode});
return promise;
}
function ReadableStreamCancel(stream, reason) {
stream[_readableStreamBits] |= DISTURBED;
const state = ReadableStreamGetState(stream);
if (state === STATE_CLOSED) {
return createResolvedPromise(undefined);
}
if (state === STATE_ERRORED) {
return createRejectedPromise(stream[_storedError]);
}
ReadableStreamClose(stream);
const sourceCancelPromise =
ReadableStreamDefaultControllerCancel(stream[_controller], reason);
return thenPromise(sourceCancelPromise, () => undefined);
}
function ReadableStreamClose(stream) {
ReadableStreamSetState(stream, STATE_CLOSED);
const reader = stream[_reader];
if (reader === undefined) {
return;
}
if (IsReadableStreamDefaultReader(reader) === true) {
reader[_readRequests].forEach(
request =>
resolvePromise(
request.promise,
ReadableStreamCreateReadResult(undefined, true,
request.forAuthorCode)));
reader[_readRequests] = new binding.SimpleQueue();
}
resolvePromise(reader[_closedPromise], undefined);
}
function ReadableStreamCreateReadResult(value, done, forAuthorCode) {
if (forAuthorCode) {
return {value, done};
}
const obj = ObjectCreate(null);
obj.value = value;
obj.done = done;
return obj;
}
function ReadableStreamError(stream, e) {
ReadableStreamSetState(stream, STATE_ERRORED);
stream[_storedError] = e;
const reader = stream[_reader];
if (reader === undefined) {
return;
}
if (IsReadableStreamDefaultReader(reader) === true) {
reader[_readRequests].forEach(request =>
rejectPromise(request.promise, e));
reader[_readRequests] = new binding.SimpleQueue();
}
rejectPromise(reader[_closedPromise], e);
markPromiseAsHandled(reader[_closedPromise]);
}
function ReadableStreamFulfillReadRequest(stream, chunk, done) {
const readRequest = stream[_reader][_readRequests].shift();
resolvePromise(readRequest.promise,
ReadableStreamCreateReadResult(chunk, done,
readRequest.forAuthorCode));
}
function ReadableStreamGetNumReadRequests(stream) {
const reader = stream[_reader];
const readRequests = reader[_readRequests];
return readRequests.length;
}
class ReadableStreamDefaultReader {
constructor(stream) {
if (stream[internalReadableStreamSymbol] !== undefined) {
stream = stream[internalReadableStreamSymbol];
}
if (IsReadableStream(stream) === false) {
throw new TypeError(errReaderConstructorBadArgument);
}
if (IsReadableStreamLocked(stream) === true) {
throw new TypeError(errReaderConstructorStreamAlreadyLocked);
}
ReadableStreamReaderGenericInitialize(this, stream);
this[_readRequests] = new binding.SimpleQueue();
}
get closed() {
if (IsReadableStreamDefaultReader(this) === false) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
return this[_closedPromise];
}
cancel(reason) {
if (IsReadableStreamDefaultReader(this) === false) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
if (this[_ownerReadableStream] === undefined) {
return createRejectedPromise(new TypeError(errCancelReleasedReader));
}
return ReadableStreamReaderGenericCancel(this, reason);
}
read() {
if (IsReadableStreamDefaultReader(this) === false) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
if (this[_ownerReadableStream] === undefined) {
return createRejectedPromise(new TypeError(errReadReleasedReader));
}
return ReadableStreamDefaultReaderRead(this, true);
}
releaseLock() {
if (IsReadableStreamDefaultReader(this) === false) {
throw new TypeError(streamErrors.illegalInvocation);
}
if (this[_ownerReadableStream] === undefined) {
return;
}
if (this[_readRequests].length > 0) {
throw new TypeError(errReleaseReaderWithPendingRead);
}
ReadableStreamReaderGenericRelease(this);
}
}
function IsReadableStreamDefaultReader(x) {
return hasOwnPropertyNoThrow(x, _readRequests);
}
function ReadableStreamReaderGenericCancel(reader, reason) {
return ReadableStreamCancel(reader[_ownerReadableStream], reason);
}
function ReadableStreamReaderGenericInitialize(reader, stream) {
const controller = stream[_controller];
if (controller[_readableStreamDefaultControllerBits] &
BLINK_LOCK_NOTIFICATIONS) {
const lockNotifyTarget = controller[_lockNotifyTarget];
callFunction(lockNotifyTarget.notifyLockAcquired, lockNotifyTarget);
}
reader[_ownerReadableStream] = stream;
stream[_reader] = reader;
switch (ReadableStreamGetState(stream)) {
case STATE_READABLE:
reader[_closedPromise] = createPromise();
break;
case STATE_CLOSED:
reader[_closedPromise] = createResolvedPromise(undefined);
break;
case STATE_ERRORED:
reader[_closedPromise] = createRejectedPromise(stream[_storedError]);
markPromiseAsHandled(reader[_closedPromise]);
break;
}
}
function ReadableStreamReaderGenericRelease(reader) {
const controller = reader[_ownerReadableStream][_controller];
if (controller[_readableStreamDefaultControllerBits] &
BLINK_LOCK_NOTIFICATIONS) {
const lockNotifyTarget = controller[_lockNotifyTarget];
callFunction(lockNotifyTarget.notifyLockReleased, lockNotifyTarget);
}
if (ReadableStreamGetState(reader[_ownerReadableStream]) ===
STATE_READABLE) {
rejectPromise(
reader[_closedPromise],
new TypeError(errReleasedReaderClosedPromise));
} else {
reader[_closedPromise] =
createRejectedPromise(new TypeError(errReleasedReaderClosedPromise));
}
markPromiseAsHandled(reader[_closedPromise]);
reader[_ownerReadableStream][_reader] = undefined;
reader[_ownerReadableStream] = undefined;
}
function ReadableStreamDefaultReaderRead(reader, forAuthorCode = false) {
const stream = reader[_ownerReadableStream];
stream[_readableStreamBits] |= DISTURBED;
switch (ReadableStreamGetState(stream)) {
case STATE_CLOSED:
return createResolvedPromise(
ReadableStreamCreateReadResult(undefined, true, forAuthorCode));
case STATE_ERRORED:
return createRejectedPromise(stream[_storedError]);
default:
return ReadableStreamDefaultControllerPull(stream[_controller],
forAuthorCode);
}
}
class ReadableStreamDefaultController {
constructor() {
throw new TypeError(streamErrors.illegalConstructor);
}
get desiredSize() {
if (IsReadableStreamDefaultController(this) === false) {
throw new TypeError(streamErrors.illegalInvocation);
}
return ReadableStreamDefaultControllerGetDesiredSize(this);
}
close() {
if (IsReadableStreamDefaultController(this) === false) {
throw new TypeError(streamErrors.illegalInvocation);
}
if (ReadableStreamDefaultControllerCanCloseOrEnqueue(this) === false) {
let errorDescription;
if (this[_readableStreamDefaultControllerBits] & CLOSE_REQUESTED) {
errorDescription = errCloseCloseRequestedStream;
} else {
const stream = this[_controlledReadableStream];
switch (ReadableStreamGetState(stream)) {
case STATE_ERRORED:
errorDescription = errCloseErroredStream;
break;
case STATE_CLOSED:
errorDescription = errCloseClosedStream;
break;
}
}
throw new TypeError(errorDescription);
}
return ReadableStreamDefaultControllerClose(this);
}
enqueue(chunk) {
if (IsReadableStreamDefaultController(this) === false) {
throw new TypeError(streamErrors.illegalInvocation);
}
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
const stream = this[_controlledReadableStream];
throw getReadableStreamEnqueueError(stream, this);
}
return ReadableStreamDefaultControllerEnqueue(this, chunk);
}
error(e) {
if (IsReadableStreamDefaultController(this) === false) {
throw new TypeError(streamErrors.illegalInvocation);
}
return ReadableStreamDefaultControllerError(this, e);
}
}
const ReadableStreamDefaultController_prototype =
ReadableStreamDefaultController.prototype;
function ReadableStreamDefaultControllerCancel(controller, reason) {
controller[_queue] = new binding.SimpleQueue();
return controller[_cancelAlgorithm](reason);
}
function ReadableStreamDefaultControllerPull(controller, forAuthorCode) {
const stream = controller[_controlledReadableStream];
if (controller[_queue].length > 0) {
const chunk = DequeueValue(controller);
if ((controller[_readableStreamDefaultControllerBits] &
CLOSE_REQUESTED) &&
controller[_queue].length === 0) {
ReadableStreamClose(stream);
} else {
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}
return createResolvedPromise(
ReadableStreamCreateReadResult(chunk, false, forAuthorCode));
}
const pendingPromise = ReadableStreamAddReadRequest(stream, forAuthorCode);
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
return pendingPromise;
}
function IsReadableStreamDefaultController(x) {
return hasOwnPropertyNoThrow(x, _controlledReadableStream);
}
function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
const shouldPull =
ReadableStreamDefaultControllerShouldCallPull(controller);
if (shouldPull === false) {
return;
}
if (controller[_readableStreamDefaultControllerBits] & PULLING) {
controller[_readableStreamDefaultControllerBits] |= PULL_AGAIN;
return;
}
controller[_readableStreamDefaultControllerBits] |= PULLING;
thenPromise(
controller[_pullAlgorithm](),
() => {
controller[_readableStreamDefaultControllerBits] &= ~PULLING;
if (controller[_readableStreamDefaultControllerBits] & PULL_AGAIN) {
controller[_readableStreamDefaultControllerBits] &= ~PULL_AGAIN;
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}
},
e => {
ReadableStreamDefaultControllerError(controller, e);
});
}
function ReadableStreamDefaultControllerShouldCallPull(controller) {
if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
return false;
}
if (!(controller[_readableStreamDefaultControllerBits] & STARTED)) {
return false;
}
const stream = controller[_controlledReadableStream];
if (IsReadableStreamLocked(stream) === true &&
ReadableStreamGetNumReadRequests(stream) > 0) {
return true;
}
const desiredSize =
ReadableStreamDefaultControllerGetDesiredSize(controller);
return desiredSize > 0;
}
function ReadableStreamDefaultControllerClose(controller) {
controller[_readableStreamDefaultControllerBits] |= CLOSE_REQUESTED;
if (controller[_queue].length === 0) {
ReadableStreamClose(controller[_controlledReadableStream]);
}
}
function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
const stream = controller[_controlledReadableStream];
if (IsReadableStreamLocked(stream) === true &&
ReadableStreamGetNumReadRequests(stream) > 0) {
ReadableStreamFulfillReadRequest(stream, chunk, false);
} else {
let chunkSize;
try {
chunkSize = callFunction(controller[_strategySizeAlgorithm], undefined,
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 (ReadableStreamGetState(stream) !== STATE_READABLE) {
return;
}
controller[_queue] = new binding.SimpleQueue();
ReadableStreamError(stream, e);
}
function ReadableStreamDefaultControllerGetDesiredSize(controller) {
switch (ReadableStreamGetState(controller[_controlledReadableStream])) {
case STATE_ERRORED:
return null;
case STATE_CLOSED:
return 0;
default:
return controller[_strategyHWM] - controller[_queueTotalSize];
}
}
function ReadableStreamDefaultControllerHasBackpressure(controller) {
return !ReadableStreamDefaultControllerShouldCallPull(controller);
}
function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
if (controller[_readableStreamDefaultControllerBits] & CLOSE_REQUESTED) {
return false;
}
const state = ReadableStreamGetState(controller[_controlledReadableStream]);
return state === STATE_READABLE;
}
function SetUpReadableStreamDefaultController(
stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm,
highWaterMark, sizeAlgorithm, enableBlinkLockNotifications) {
controller[_controlledReadableStream] = stream;
controller[_queue] = new binding.SimpleQueue();
controller[_queueTotalSize] = 0;
controller[_readableStreamDefaultControllerBits] =
enableBlinkLockNotifications ? BLINK_LOCK_NOTIFICATIONS : 0b0;
controller[_strategySizeAlgorithm] = sizeAlgorithm;
controller[_strategyHWM] = highWaterMark;
controller[_pullAlgorithm] = pullAlgorithm;
controller[_cancelAlgorithm] = cancelAlgorithm;
stream[_controller] = controller;
thenPromise(createResolvedPromise(startAlgorithm()), () => {
controller[_readableStreamDefaultControllerBits] |= STARTED;
ReadableStreamDefaultControllerCallPullIfNeeded(controller);
}, r =>  ReadableStreamDefaultControllerError(controller, r));
}
function SetUpReadableStreamDefaultControllerFromUnderlyingSource(
stream, underlyingSource, highWaterMark, sizeAlgorithm,
enableBlinkLockNotifications) {
const controller = ObjectCreate(ReadableStreamDefaultController_prototype);
const startAlgorithm =
() => CallOrNoop1(underlyingSource, 'start', controller,
'underlyingSource.start');
const pullAlgorithm = CreateAlgorithmFromUnderlyingMethodPassingController(
underlyingSource, 'pull', 0, controller, 'underlyingSource.pull');
const cancelAlgorithm = CreateAlgorithmFromUnderlyingMethod(
underlyingSource, 'cancel', 1, 'underlyingSource.cancel');
if (enableBlinkLockNotifications) {
controller[_lockNotifyTarget] = underlyingSource;
}
SetUpReadableStreamDefaultController(
stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm,
highWaterMark, sizeAlgorithm, enableBlinkLockNotifications);
}
function ReadableStreamSerialize(readable, port) {
if (IsReadableStreamLocked(readable)) {
throw new TypeError(streamErrors.cannotTransferLockedStream);
}
if (!binding.MessagePort_postMessage) {
throw new TypeError(streamErrors.cannotTransferContext);
}
const writable = CreateCrossRealmTransformWritable(port);
const promise =
ReadableStreamPipeTo(readable, writable, false, false, false);
markPromiseAsHandled(promise);
}
function ReadableStreamDeserialize(port) {
return CreateCrossRealmTransformReadable(port);
}
function ReadableStreamGetState(stream) {
return (stream[_readableStreamBits] & STATE_MASK) >> STATE_BITS_OFFSET;
}
function ReadableStreamSetState(stream, state) {
stream[_readableStreamBits] = (stream[_readableStreamBits] & ~STATE_MASK) |
(state << STATE_BITS_OFFSET);
}
function IsReadableStreamReadable(stream) {
return ReadableStreamGetState(stream) === STATE_READABLE;
}
function IsReadableStreamClosed(stream) {
return ReadableStreamGetState(stream) === STATE_CLOSED;
}
function IsReadableStreamErrored(stream) {
return ReadableStreamGetState(stream) === STATE_ERRORED;
}
function getReadableStreamEnqueueError(stream, controller) {
if (controller[_readableStreamDefaultControllerBits] & CLOSE_REQUESTED) {
return new TypeError(errEnqueueCloseRequestedStream);
}
const state = ReadableStreamGetState(stream);
if (state === STATE_ERRORED) {
return new TypeError(errEnqueueErroredStream);
}
return new TypeError(errEnqueueClosedStream);
}
function getReadableStreamController(stream) {
return stream[_controller];
}
function getReadableStreamStoredError(stream) {
return stream[_storedError];
}
function createReadableStream(underlyingSource, strategy) {
return new ReadableStream(underlyingSource, strategy);
}
function createReadableStreamWithExternalController(
underlyingSource, strategy) {
return new ReadableStream(
underlyingSource, strategy, createWithExternalControllerSentinel);
}
Object.assign(binding, {
AcquireReadableStreamDefaultReader,
createReadableStream,
createReadableStreamWithExternalController,
IsReadableStream,
IsReadableStreamDisturbed,
IsReadableStreamLocked,
IsReadableStreamReadable,
IsReadableStreamClosed,
IsReadableStreamErrored,
IsReadableStreamDefaultReader,
ReadableStreamDefaultReaderRead,
ReadableStreamCancel,
ReadableStreamTee,
ReadableStreamPipeTo,
ReadableStreamSerialize,
ReadableStreamDeserialize,
internalReadableStreamSymbol,
ReadableStreamDefaultControllerClose,
ReadableStreamDefaultControllerGetDesiredSize,
ReadableStreamDefaultControllerEnqueue,
ReadableStreamDefaultControllerError,
CreateReadableStream,
ReadableStreamDefaultControllerCanCloseOrEnqueue,
ReadableStreamDefaultControllerHasBackpressure,
getReadableStreamEnqueueError,
getReadableStreamController,
getReadableStreamStoredError,
});
});
8WritableStreamº£

(function(global, binding, v8) {
'use strict';
const _abortAlgorithm = v8.createPrivateSymbol('[[abortAlgorithm]]');
const _closeAlgorithm = v8.createPrivateSymbol('[[closeAlgorithm]]');
const _closeRequest = v8.createPrivateSymbol('[[closeRequest]]');
const _inFlightWriteRequest =
v8.createPrivateSymbol('[[inFlightWriteRequest]]');
const _inFlightCloseRequest =
v8.createPrivateSymbol('[[inFlightCloseRequest]]');
const _pendingAbortRequest =
v8.createPrivateSymbol('[[pendingAbortRequest]]');
const _stateAndFlags = v8.createPrivateSymbol('[[state]] and flags');
const _storedError = v8.createPrivateSymbol('[[storedError]]');
const _writableStreamController =
v8.createPrivateSymbol('[[writableStreamController]]');
const _writer = v8.createPrivateSymbol('[[writer]]');
const _writeRequests = v8.createPrivateSymbol('[[writeRequests]]');
const _closedPromise = v8.createPrivateSymbol('[[closedPromise]]');
const _ownerWritableStream =
v8.createPrivateSymbol('[[ownerWritableStream]]');
const _readyPromise = v8.createPrivateSymbol('[[readyPromise]]');
const _controlledWritableStream =
v8.createPrivateSymbol('[[controlledWritableStream]]');
const _started = v8.createPrivateSymbol('[[started]]');
const _strategyHWM = v8.createPrivateSymbol('[[strategyHWM]]');
const _strategySizeAlgorithm =
v8.createPrivateSymbol('[[strategySizeAlgorithm]]');
const _writeAlgorithm = v8.createPrivateSymbol('[[writeAlgorithm]]');
const internalWritableStreamSymbol = v8.createPrivateSymbol(
'internal WritableStream in exposed WritableStream interface');
const WRITABLE = 0;
const CLOSED = 1;
const ERRORING = 2;
const ERRORED = 3;
const STATE_MASK = 0xF;
const BACKPRESSURE_FLAG = 0x10;
const ObjectCreate = global.Object.create;
const Function_call = v8.uncurryThis(global.Function.prototype.call);
const TypeError = global.TypeError;
const RangeError = global.RangeError;
const Boolean = global.Boolean;
const Promise = global.Promise;
const thenPromise = v8.uncurryThis(Promise.prototype.then);
const {
_queue,
_queueTotalSize,
createPromise,
createRejectedPromise,
createResolvedPromise,
hasOwnPropertyNoThrow,
rejectPromise,
resolvePromise,
markPromiseAsHandled,
promiseState,
CreateAlgorithmFromUnderlyingMethod,
CreateAlgorithmFromUnderlyingMethodPassingController,
DequeueValue,
EnqueueValueWithSize,
MakeSizeAlgorithmFromSizeFunction,
PeekQueueValue,
ResetQueue,
ValidateAndNormalizeHighWaterMark,
CreateCrossRealmTransformReadable,
CreateCrossRealmTransformWritable,
CallOrNoop1,
} = binding.streamOperations;
const streamErrors = binding.streamErrors;
const errWriterLockReleasedPrefix =
'This writable stream writer has been released and cannot be ';
const errCloseCloseRequestedStream = 'Cannot close a writable stream that ' +
'has already been requested to be closed';
const templateErrorCannotActionOnStateStream = (action, state) =>
`Cannot ${action} a ${state} writable stream`;
const errReleasedWriterClosedPromise = 'This writable stream writer has ' +
'been released and cannot be used to monitor the stream\'s state';
const verbUsedToGetTheDesiredSize = 'used to get the desiredSize';
const verbAborted = 'aborted';
const verbClosed = 'closed';
const verbWrittenTo = 'written to';
function createWriterLockReleasedError(verb) {
return new TypeError(errWriterLockReleasedPrefix + verb);
}
const stateNames = {
[CLOSED]: 'closed',
[ERRORED]: 'errored'
};
function createCannotActionOnStateStreamError(action, state) {
return new TypeError(
templateErrorCannotActionOnStateStream(action, stateNames[state]));
}
function rejectPromises(queue, e) {
queue.forEach(promise => rejectPromise(promise, e));
}
class WritableStream {
constructor(underlyingSink = {}, strategy = {}) {
InitializeWritableStream(this);
const size = strategy.size;
let highWaterMark = strategy.highWaterMark;
const type = underlyingSink.type;
if (type !== undefined) {
throw new RangeError(streamErrors.invalidType);
}
const sizeAlgorithm = MakeSizeAlgorithmFromSizeFunction(size);
if (highWaterMark === undefined) {
highWaterMark = 1;
}
highWaterMark = ValidateAndNormalizeHighWaterMark(highWaterMark);
SetUpWritableStreamDefaultControllerFromUnderlyingSink(
this, underlyingSink, highWaterMark, sizeAlgorithm);
}
}
const WritableStream_prototype = WritableStream.prototype;
function createWritableStream(underlyingSink, strategy) {
return new WritableStream(underlyingSink, strategy);
}
function AcquireWritableStreamDefaultWriter(stream) {
return new WritableStreamDefaultWriter(stream);
}
function CreateWritableStream(
startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,
highWaterMark, sizeAlgorithm) {
if (highWaterMark === undefined) {
highWaterMark = 1;
}
if (sizeAlgorithm === undefined) {
sizeAlgorithm = () => 1;
}
const stream = ObjectCreate(WritableStream_prototype);
InitializeWritableStream(stream);
const controller = ObjectCreate(WritableStreamDefaultController_prototype);
SetUpWritableStreamDefaultController(
stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,
abortAlgorithm, highWaterMark, sizeAlgorithm);
return stream;
}
function InitializeWritableStream(stream) {
stream[_stateAndFlags] = WRITABLE;
stream[_storedError] = undefined;
stream[_writer] = undefined;
stream[_writableStreamController] = undefined;
stream[_inFlightWriteRequest] = undefined;
stream[_closeRequest] = undefined;
stream[_inFlightCloseRequest] = undefined;
stream[_pendingAbortRequest] = undefined;
stream[_writeRequests] = new binding.SimpleQueue();
}
function IsWritableStream(x) {
return hasOwnPropertyNoThrow(x, _writableStreamController);
}
function IsWritableStreamLocked(stream) {
return stream[_writer] !== undefined;
}
function WritableStreamAbort(stream, reason) {
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === CLOSED || state === ERRORED) {
return createResolvedPromise(undefined);
}
if (stream[_pendingAbortRequest] !== undefined) {
return stream[_pendingAbortRequest].promise;
}
const wasAlreadyErroring = state === ERRORING;
if (wasAlreadyErroring) {
reason = undefined;
}
const promise = createPromise();
stream[_pendingAbortRequest] = {promise, reason, wasAlreadyErroring};
if (!wasAlreadyErroring) {
WritableStreamStartErroring(stream, reason);
}
return promise;
}
function WritableStreamAddWriteRequest(stream) {
const promise = createPromise();
stream[_writeRequests].push(promise);
return promise;
}
function WritableStreamDealWithRejection(stream, error) {
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === WRITABLE) {
WritableStreamStartErroring(stream, error);
return;
}
WritableStreamFinishErroring(stream);
}
function WritableStreamStartErroring(stream, reason) {
const controller = stream[_writableStreamController];
stream[_stateAndFlags] = (stream[_stateAndFlags] & ~STATE_MASK) | 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[_stateAndFlags] = (stream[_stateAndFlags] & ~STATE_MASK) | ERRORED;
WritableStreamDefaultControllerErrorSteps(
stream[_writableStreamController]);
const storedError = stream[_storedError];
rejectPromises(stream[_writeRequests], storedError);
stream[_writeRequests] = new binding.SimpleQueue();
if (stream[_pendingAbortRequest] === undefined) {
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const abortRequest = stream[_pendingAbortRequest];
stream[_pendingAbortRequest] = undefined;
if (abortRequest.wasAlreadyErroring === true) {
rejectPromise(abortRequest.promise, storedError);
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
return;
}
const promise = WritableStreamDefaultControllerAbortSteps(
stream[_writableStreamController], abortRequest.reason);
thenPromise(
promise,
() => {
resolvePromise(abortRequest.promise, undefined);
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
},
reason => {
rejectPromise(abortRequest.promise, reason);
WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
});
}
function WritableStreamFinishInFlightWrite(stream) {
resolvePromise(stream[_inFlightWriteRequest], undefined);
stream[_inFlightWriteRequest] = undefined;
}
function WritableStreamFinishInFlightWriteWithError(stream, error) {
rejectPromise(stream[_inFlightWriteRequest], error);
stream[_inFlightWriteRequest] = undefined;
WritableStreamDealWithRejection(stream, error);
}
function WritableStreamFinishInFlightClose(stream) {
resolvePromise(stream[_inFlightCloseRequest], undefined);
stream[_inFlightCloseRequest] = undefined;
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === ERRORING) {
stream[_storedError] = undefined;
if (stream[_pendingAbortRequest] !== undefined) {
resolvePromise(stream[_pendingAbortRequest].promise, undefined);
stream[_pendingAbortRequest] = undefined;
}
}
stream[_stateAndFlags] = (stream[_stateAndFlags] & ~STATE_MASK) | CLOSED;
const writer = stream[_writer];
if (writer !== undefined) {
resolvePromise(writer[_closedPromise], undefined);
}
}
function WritableStreamFinishInFlightCloseWithError(stream, error) {
rejectPromise(stream[_inFlightCloseRequest], error);
stream[_inFlightCloseRequest] = undefined;
if (stream[_pendingAbortRequest] !== undefined) {
rejectPromise(stream[_pendingAbortRequest].promise, error);
stream[_pendingAbortRequest] = undefined;
}
WritableStreamDealWithRejection(stream, error);
}
function WritableStreamCloseQueuedOrInFlight(stream) {
return stream[_closeRequest] !== undefined ||
stream[_inFlightCloseRequest] !== undefined;
}
function WritableStreamHasOperationMarkedInFlight(stream) {
return stream[_inFlightWriteRequest] !== undefined ||
stream[_inFlightCloseRequest] !== undefined;
}
function WritableStreamMarkCloseRequestInFlight(stream) {
stream[_inFlightCloseRequest] = stream[_closeRequest];
stream[_closeRequest] = undefined;
}
function WritableStreamMarkFirstWriteRequestInFlight(stream) {
const writeRequest = stream[_writeRequests].shift();
stream[_inFlightWriteRequest] = writeRequest;
}
function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
if (stream[_closeRequest] !== undefined) {
rejectPromise(stream[_closeRequest], stream[_storedError]);
stream[_closeRequest] = undefined;
}
const writer = stream[_writer];
if (writer !== undefined) {
rejectPromise(writer[_closedPromise], stream[_storedError]);
markPromiseAsHandled(writer[_closedPromise]);
}
}
function WritableStreamUpdateBackpressure(stream, backpressure) {
const writer = stream[_writer];
if (writer !== undefined &&
backpressure !== Boolean(stream[_stateAndFlags] & BACKPRESSURE_FLAG)) {
if (backpressure) {
writer[_readyPromise] = createPromise();
} else {
resolvePromise(writer[_readyPromise], undefined);
}
}
if (backpressure) {
stream[_stateAndFlags] |= BACKPRESSURE_FLAG;
} else {
stream[_stateAndFlags] &= ~BACKPRESSURE_FLAG;
}
}
function WritableStreamSerialize(writable, port) {
if (IsWritableStreamLocked(writable)) {
throw new TypeError(streamErrors.cannotTransferLockedStream);
}
if (!binding.MessagePort_postMessage) {
throw new TypeError(streamErrors.cannotTransferContext);
}
const readable = CreateCrossRealmTransformReadable(port);
const promise =
binding.ReadableStreamPipeTo(readable, writable, false, false, false);
markPromiseAsHandled(promise);
}
function WritableStreamDeserialize(port) {
return CreateCrossRealmTransformWritable(port);
}
function isWritableStreamErrored(stream) {
return (stream[_stateAndFlags] & STATE_MASK) === ERRORED;
}
function isWritableStreamClosingOrClosed(stream) {
return WritableStreamCloseQueuedOrInFlight(stream) ||
(stream[_stateAndFlags] & STATE_MASK) === CLOSED;
}
function getWritableStreamStoredError(stream) {
return stream[_storedError];
}
function isWritableStreamWritable(stream) {
return  (stream[_stateAndFlags] & STATE_MASK) === WRITABLE;
}
function isWritableStreamErroring(stream) {
return  (stream[_stateAndFlags] & STATE_MASK) === ERRORING;
}
function getWritableStreamController(stream) {
return stream[_writableStreamController];
}
class WritableStreamDefaultWriter {
constructor(stream) {
if (stream[internalWritableStreamSymbol] !== undefined) {
stream = stream[internalWritableStreamSymbol];
}
if (!IsWritableStream(stream)) {
throw new TypeError(streamErrors.illegalConstructor);
}
if (IsWritableStreamLocked(stream)) {
throw new TypeError(streamErrors.illegalConstructor);
}
this[_ownerWritableStream] = stream;
stream[_writer] = this;
const state = stream[_stateAndFlags] & STATE_MASK;
switch (state) {
case WRITABLE: {
if (!WritableStreamCloseQueuedOrInFlight(stream) &&
stream[_stateAndFlags] & BACKPRESSURE_FLAG) {
this[_readyPromise] = createPromise();
} else {
this[_readyPromise] = createResolvedPromise(undefined);
}
this[_closedPromise] = createPromise();
break;
}
case ERRORING: {
this[_readyPromise] = createRejectedPromise(stream[_storedError]);
markPromiseAsHandled(this[_readyPromise]);
this[_closedPromise] = createPromise();
break;
}
case CLOSED: {
this[_readyPromise] = createResolvedPromise(undefined);
this[_closedPromise] = createResolvedPromise(undefined);
break;
}
default: {
const storedError = stream[_storedError];
this[_readyPromise] = createRejectedPromise(storedError);
markPromiseAsHandled(this[_readyPromise]);
this[_closedPromise] = createRejectedPromise(storedError);
markPromiseAsHandled(this[_closedPromise]);
break;
}
}
}
get closed() {
if (!IsWritableStreamDefaultWriter(this)) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
return this[_closedPromise];
}
get desiredSize() {
if (!IsWritableStreamDefaultWriter(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
if (this[_ownerWritableStream] === undefined) {
throw createWriterLockReleasedError(verbUsedToGetTheDesiredSize);
}
return WritableStreamDefaultWriterGetDesiredSize(this);
}
get ready() {
if (!IsWritableStreamDefaultWriter(this)) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
return this[_readyPromise];
}
abort(reason) {
if (!IsWritableStreamDefaultWriter(this)) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
if (this[_ownerWritableStream] === undefined) {
return createRejectedPromise(
createWriterLockReleasedError(verbAborted));
}
return WritableStreamDefaultWriterAbort(this, reason);
}
close() {
if (!IsWritableStreamDefaultWriter(this)) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
const stream = this[_ownerWritableStream];
if (stream === undefined) {
return createRejectedPromise(createWriterLockReleasedError(verbClosed));
}
if (WritableStreamCloseQueuedOrInFlight(stream)) {
return createRejectedPromise(
new TypeError(errCloseCloseRequestedStream));
}
return WritableStreamDefaultWriterClose(this);
}
releaseLock() {
if (!IsWritableStreamDefaultWriter(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
const stream = this[_ownerWritableStream];
if (stream === undefined) {
return;
}
WritableStreamDefaultWriterRelease(this);
}
write(chunk) {
if (!IsWritableStreamDefaultWriter(this)) {
return createRejectedPromise(
new TypeError(streamErrors.illegalInvocation));
}
if (this[_ownerWritableStream] === undefined) {
return createRejectedPromise(
createWriterLockReleasedError(verbWrittenTo));
}
return WritableStreamDefaultWriterWrite(this, chunk);
}
}
function IsWritableStreamDefaultWriter(x) {
return hasOwnPropertyNoThrow(x, _ownerWritableStream);
}
function WritableStreamDefaultWriterAbort(writer, reason) {
const stream = writer[_ownerWritableStream];
return WritableStreamAbort(stream, reason);
}
function WritableStreamDefaultWriterClose(writer) {
const stream = writer[_ownerWritableStream];
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === CLOSED || state === ERRORED) {
return createRejectedPromise(
createCannotActionOnStateStreamError('close', state));
}
const promise = createPromise();
stream[_closeRequest] = promise;
if ((stream[_stateAndFlags] & BACKPRESSURE_FLAG) && state === WRITABLE) {
resolvePromise(writer[_readyPromise], undefined);
}
WritableStreamDefaultControllerClose(stream[_writableStreamController]);
return promise;
}
function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
const stream = writer[_ownerWritableStream];
const state = stream[_stateAndFlags] & STATE_MASK;
if (WritableStreamCloseQueuedOrInFlight(stream) || state === CLOSED) {
return createResolvedPromise(undefined);
}
if (state === ERRORED) {
return createRejectedPromise(stream[_storedError]);
}
return WritableStreamDefaultWriterClose(writer);
}
function WritableStreamDefaultWriterEnsureClosedPromiseRejected(
writer, error) {
if (promiseState(writer[_closedPromise]) === v8.kPROMISE_PENDING) {
rejectPromise(writer[_closedPromise], error);
} else {
writer[_closedPromise] = createRejectedPromise(error);
}
markPromiseAsHandled(writer[_closedPromise]);
}
function WritableStreamDefaultWriterEnsureReadyPromiseRejected(
writer, error) {
if (promiseState(writer[_readyPromise]) === v8.kPROMISE_PENDING) {
rejectPromise(writer[_readyPromise], error);
} else {
writer[_readyPromise] = createRejectedPromise(error);
}
markPromiseAsHandled(writer[_readyPromise]);
}
function WritableStreamDefaultWriterGetDesiredSize(writer) {
const stream = writer[_ownerWritableStream];
const state = stream[_stateAndFlags] & STATE_MASK;
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(errReleasedWriterClosedPromise);
WritableStreamDefaultWriterEnsureReadyPromiseRejected(
writer, releasedError);
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 createRejectedPromise(
createWriterLockReleasedError(verbWrittenTo));
}
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === ERRORED) {
return createRejectedPromise(stream[_storedError]);
}
if (WritableStreamCloseQueuedOrInFlight(stream)) {
return createRejectedPromise(new TypeError(
templateErrorCannotActionOnStateStream('write to', 'closing')));
}
if (state === CLOSED) {
return createRejectedPromise(
createCannotActionOnStateStreamError('write to', CLOSED));
}
if (state === ERRORING) {
return createRejectedPromise(stream[_storedError]);
}
const promise = WritableStreamAddWriteRequest(stream);
WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
return promise;
}
function getWritableStreamDefaultWriterClosedPromise(writer) {
return writer[_closedPromise];
}
function getWritableStreamDefaultWriterReadyPromise(writer) {
return writer[_readyPromise];
}
class WritableStreamDefaultController {
constructor() {
throw new TypeError(streamErrors.illegalConstructor);
}
error(e) {
if (!IsWritableStreamDefaultController(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
const state =
this[_controlledWritableStream][_stateAndFlags] & STATE_MASK;
if (state !== WRITABLE) {
return;
}
WritableStreamDefaultControllerError(this, e);
}
}
const WritableStreamDefaultController_prototype =
WritableStreamDefaultController.prototype;
function WritableStreamDefaultControllerAbortSteps(controller, reason) {
const result = controller[_abortAlgorithm](reason);
WritableStreamDefaultControllerClearAlgorithms(controller);
return result;
}
function WritableStreamDefaultControllerErrorSteps(controller) {
ResetQueue(controller);
}
function IsWritableStreamDefaultController(x) {
return hasOwnPropertyNoThrow(x, _controlledWritableStream);
}
function SetUpWritableStreamDefaultController(
stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,
abortAlgorithm, highWaterMark, sizeAlgorithm) {
controller[_controlledWritableStream] = stream;
stream[_writableStreamController] = controller;
controller[_queue] = undefined;
controller[_queueTotalSize] = undefined;
ResetQueue(controller);
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 = createResolvedPromise(startResult);
thenPromise(
startPromise,
() => {
controller[_started] = true;
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
},
r => {
controller[_started] = true;
WritableStreamDealWithRejection(stream, r);
});
}
function SetUpWritableStreamDefaultControllerFromUnderlyingSink(
stream, underlyingSink, highWaterMark, sizeAlgorithm) {
const controller = ObjectCreate(WritableStreamDefaultController_prototype);
const startAlgorithm =
() => CallOrNoop1(underlyingSink, 'start', controller,
'underlyingSink.start');
const writeAlgorithm = CreateAlgorithmFromUnderlyingMethodPassingController(
underlyingSink, 'write', 1, controller, 'underlyingSink.write');
const closeAlgorithm = CreateAlgorithmFromUnderlyingMethod(
underlyingSink, 'close', 0, 'underlyingSink.close');
const abortAlgorithm = CreateAlgorithmFromUnderlyingMethod(
underlyingSink, 'abort', 1, 'underlyingSink.abort');
SetUpWritableStreamDefaultController(stream, controller, startAlgorithm,
writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark,
sizeAlgorithm);
}
function WritableStreamDefaultControllerClearAlgorithms(controller) {
controller[_writeAlgorithm] = undefined;
controller[_closeAlgorithm] = undefined;
controller[_abortAlgorithm] = undefined;
}
function WritableStreamDefaultControllerClose(controller) {
EnqueueValueWithSize(controller, 'close', 0);
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
try {
return Function_call(controller[_strategySizeAlgorithm], undefined,
chunk);
} catch (e) {
WritableStreamDefaultControllerErrorIfNeeded(controller, e);
return 1;
}
}
function WritableStreamDefaultControllerGetDesiredSize(controller) {
return controller[_strategyHWM] - controller[_queueTotalSize];
}
function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
const writeRecord = {chunk};
try {
EnqueueValueWithSize(controller, writeRecord, chunkSize);
} catch (e) {
WritableStreamDefaultControllerErrorIfNeeded(controller, e);
return;
}
const stream = controller[_controlledWritableStream];
if (!WritableStreamCloseQueuedOrInFlight(stream) &&
(stream[_stateAndFlags] & STATE_MASK) === WRITABLE) {
const backpressure =
WritableStreamDefaultControllerGetBackpressure(controller);
WritableStreamUpdateBackpressure(stream, backpressure);
}
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
}
function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
const stream = controller[_controlledWritableStream];
if (!controller[_started]) {
return;
}
if (stream[_inFlightWriteRequest] !== undefined) {
return;
}
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === CLOSED || state === ERRORED) {
return;
}
if (state === ERRORING) {
WritableStreamFinishErroring(stream);
return;
}
if (controller[_queue].length === 0) {
return;
}
const writeRecord = PeekQueueValue(controller);
if (writeRecord === 'close') {
WritableStreamDefaultControllerProcessClose(controller);
} else {
WritableStreamDefaultControllerProcessWrite(
controller, writeRecord.chunk);
}
}
function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
const state =
controller[_controlledWritableStream][_stateAndFlags] & STATE_MASK;
if (state === WRITABLE) {
WritableStreamDefaultControllerError(controller, error);
}
}
function WritableStreamDefaultControllerProcessClose(controller) {
const stream = controller[_controlledWritableStream];
WritableStreamMarkCloseRequestInFlight(stream);
DequeueValue(controller);
const sinkClosePromise = controller[_closeAlgorithm]();
WritableStreamDefaultControllerClearAlgorithms(controller);
thenPromise(
sinkClosePromise, () => WritableStreamFinishInFlightClose(stream),
reason => WritableStreamFinishInFlightCloseWithError(stream, reason));
}
function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
const stream = controller[_controlledWritableStream];
WritableStreamMarkFirstWriteRequestInFlight(stream);
const sinkWritePromise = controller[_writeAlgorithm](chunk);
thenPromise(
sinkWritePromise,
() => {
WritableStreamFinishInFlightWrite(stream);
const state = stream[_stateAndFlags] & STATE_MASK;
DequeueValue(controller);
if (!WritableStreamCloseQueuedOrInFlight(stream) &&
state === WRITABLE) {
const backpressure =
WritableStreamDefaultControllerGetBackpressure(controller);
WritableStreamUpdateBackpressure(stream, backpressure);
}
WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
},
reason => {
const state = stream[_stateAndFlags] & STATE_MASK;
if (state === WRITABLE) {
WritableStreamDefaultControllerClearAlgorithms(controller);
}
WritableStreamFinishInFlightWriteWithError(stream, reason);
});
}
function WritableStreamDefaultControllerGetBackpressure(controller) {
const desiredSize =
WritableStreamDefaultControllerGetDesiredSize(controller);
return desiredSize <= 0;
}
function WritableStreamDefaultControllerError(controller, error) {
const stream = controller[_controlledWritableStream];
WritableStreamDefaultControllerClearAlgorithms(controller);
WritableStreamStartErroring(stream, error);
}
Object.assign(binding, {
AcquireWritableStreamDefaultWriter,
IsWritableStream,
isWritableStreamClosingOrClosed,
isWritableStreamErrored,
isWritableStreamWritable,
IsWritableStreamLocked,
WritableStreamAbort,
WritableStreamCloseQueuedOrInFlight,
WritableStreamDefaultWriterCloseWithErrorPropagation,
getWritableStreamDefaultWriterClosedPromise,
WritableStreamDefaultWriterGetDesiredSize,
getWritableStreamDefaultWriterReadyPromise,
WritableStreamDefaultWriterRelease,
WritableStreamDefaultWriterWrite,
getWritableStreamStoredError,
createWritableStream,
internalWritableStreamSymbol,
WritableStreamSerialize,
WritableStreamDeserialize,
CreateWritableStream,
WritableStream,
WritableStreamDefaultControllerErrorIfNeeded,
isWritableStreamErroring,
getWritableStreamController,
WritableStreamDefaultControllerClose,
});
});
<TransformStream�Ë
(function(global, binding, v8) {
'use strict';
const _backpressure = v8.createPrivateSymbol('[[backpressure]]');
const _backpressureChangePromise =
v8.createPrivateSymbol('[[backpressureChangePromise]]');
const _readable = v8.createPrivateSymbol('[[readable]]');
const _transformStreamController =
v8.createPrivateSymbol('[[transformStreamController]]');
const _writable = v8.createPrivateSymbol('[[writable]]');
const _controlledTransformStream =
v8.createPrivateSymbol('[[controlledTransformStream]]');
const _flushAlgorithm = v8.createPrivateSymbol('[[flushAlgorithm]]');
const _transformAlgorithm = v8.createPrivateSymbol('[[transformAlgorithm]]');
const ObjectCreate = global.Object.create;
const TypeError = global.TypeError;
const RangeError = global.RangeError;
const Promise = global.Promise;
const thenPromise = v8.uncurryThis(Promise.prototype.then);
const {
createPromise,
createRejectedPromise,
createResolvedPromise,
hasOwnPropertyNoThrow,
resolvePromise,
CreateAlgorithmFromUnderlyingMethod,
CallOrNoop1,
MakeSizeAlgorithmFromSizeFunction,
PromiseCall2,
ValidateAndNormalizeHighWaterMark
} = binding.streamOperations;
const streamErrors = binding.streamErrors;
const errStreamTerminated = 'The transform stream has been terminated';
let useCounted = false;
class TransformStream {
constructor(transformer = {},
writableStrategy = {}, readableStrategy = {}) {
if (!useCounted) {
binding.countUse('TransformStreamConstructor');
useCounted = true;
}
const writableSizeFunction = writableStrategy.size;
let writableHighWaterMark = writableStrategy.highWaterMark;
const readableSizeFunction = readableStrategy.size;
let readableHighWaterMark = readableStrategy.highWaterMark;
const writableType = transformer.writableType;
if (writableType !== undefined) {
throw new RangeError(streamErrors.invalidType);
}
const writableSizeAlgorithm =
MakeSizeAlgorithmFromSizeFunction(writableSizeFunction);
if (writableHighWaterMark === undefined) {
writableHighWaterMark = 1;
}
writableHighWaterMark =
ValidateAndNormalizeHighWaterMark(writableHighWaterMark);
const readableType = transformer.readableType;
if (readableType !== undefined) {
throw new RangeError(streamErrors.invalidType);
}
const readableSizeAlgorithm =
MakeSizeAlgorithmFromSizeFunction(readableSizeFunction);
if (readableHighWaterMark === undefined) {
readableHighWaterMark = 0;
}
readableHighWaterMark =
ValidateAndNormalizeHighWaterMark(readableHighWaterMark);
const startPromise = createPromise();
InitializeTransformStream(
this, startPromise, writableHighWaterMark, writableSizeAlgorithm,
readableHighWaterMark, readableSizeAlgorithm);
SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
const startResult = CallOrNoop1(
transformer, 'start', this[_transformStreamController],
'transformer.start');
resolvePromise(startPromise, startResult);
}
get readable() {
if (!IsTransformStream(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
return this[_readable];
}
get writable() {
if (!IsTransformStream(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
return this[_writable];
}
}
const TransformStream_prototype = TransformStream.prototype;
function CreateTransformStream(
startAlgorithm, transformAlgorithm, flushAlgorithm, writableHighWaterMark,
writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
if (writableHighWaterMark === undefined) {
writableHighWaterMark = 1;
}
if (writableSizeAlgorithm === undefined) {
writableSizeAlgorithm = () => 1;
}
if (readableHighWaterMark === undefined) {
readableHighWaterMark = 0;
}
if (readableSizeAlgorithm === undefined) {
readableSizeAlgorithm = () => 1;
}
const stream = ObjectCreate(TransformStream_prototype);
const startPromise = createPromise();
InitializeTransformStream(
stream, startPromise, writableHighWaterMark, writableSizeAlgorithm,
readableHighWaterMark, readableSizeAlgorithm);
const controller = ObjectCreate(TransformStreamDefaultController_prototype);
SetUpTransformStreamDefaultController(
stream, controller, transformAlgorithm, flushAlgorithm);
const startResult = startAlgorithm();
resolvePromise(startPromise, startResult);
return stream;
}
function InitializeTransformStream(
stream, startPromise, writableHighWaterMark, writableSizeAlgorithm,
readableHighWaterMark, readableSizeAlgorithm) {
const startAlgorithm = () => startPromise;
const writeAlgorithm = chunk =>
TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
const abortAlgorithm = reason =>
TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
const closeAlgorithm = () =>
TransformStreamDefaultSinkCloseAlgorithm(stream);
stream[_writable] = binding.CreateWritableStream(
startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,
writableHighWaterMark, writableSizeAlgorithm);
const pullAlgorithm = () =>
TransformStreamDefaultSourcePullAlgorithm(stream);
const cancelAlgorithm = reason => {
TransformStreamErrorWritableAndUnblockWrite(stream, reason);
return createResolvedPromise(undefined);
};
stream[_readable] = binding.CreateReadableStream(
startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,
readableSizeAlgorithm, false);
stream[_backpressure] = undefined;
stream[_backpressureChangePromise] = undefined;
TransformStreamSetBackpressure(stream, true);
stream[_transformStreamController] = undefined;
}
function IsTransformStream(x) {
return hasOwnPropertyNoThrow(x, _transformStreamController);
}
function TransformStreamError(stream, e) {
const readable = stream[_readable];
if (binding.IsReadableStreamReadable(readable)) {
binding.ReadableStreamDefaultControllerError(
binding.getReadableStreamController(readable), e);
}
TransformStreamErrorWritableAndUnblockWrite(stream, e);
}
function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
TransformStreamDefaultControllerClearAlgorithms(
stream[_transformStreamController]);
binding.WritableStreamDefaultControllerErrorIfNeeded(
binding.getWritableStreamController(stream[_writable]), e);
if (stream[_backpressure]) {
TransformStreamSetBackpressure(stream, false);
}
}
function TransformStreamSetBackpressure(stream, backpressure) {
if (stream[_backpressureChangePromise] !== undefined) {
resolvePromise(stream[_backpressureChangePromise], undefined);
}
stream[_backpressureChangePromise] = createPromise();
stream[_backpressure] = backpressure;
}
class TransformStreamDefaultController {
constructor() {
throw new TypeError(streamErrors.illegalConstructor);
}
get desiredSize() {
if (!IsTransformStreamDefaultController(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
const readableController = binding.getReadableStreamController(
this[_controlledTransformStream][_readable]);
return binding.ReadableStreamDefaultControllerGetDesiredSize(
readableController);
}
enqueue(chunk) {
if (!IsTransformStreamDefaultController(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
TransformStreamDefaultControllerEnqueue(this, chunk);
}
error(reason) {
if (!IsTransformStreamDefaultController(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
TransformStreamDefaultControllerError(this, reason);
}
terminate() {
if (!IsTransformStreamDefaultController(this)) {
throw new TypeError(streamErrors.illegalInvocation);
}
TransformStreamDefaultControllerTerminate(this);
}
}
const TransformStreamDefaultController_prototype =
TransformStreamDefaultController.prototype;
function IsTransformStreamDefaultController(x) {
return hasOwnPropertyNoThrow(x, _controlledTransformStream);
}
function SetUpTransformStreamDefaultController(
stream, controller, transformAlgorithm, flushAlgorithm) {
controller[_controlledTransformStream] = stream;
stream[_transformStreamController] = controller;
controller[_transformAlgorithm] = transformAlgorithm;
controller[_flushAlgorithm] = flushAlgorithm;
}
function SetUpTransformStreamDefaultControllerFromTransformer(
stream, transformer) {
const controller = ObjectCreate(TransformStreamDefaultController_prototype);
let transformAlgorithm;
const transformMethod = transformer.transform;
if (transformMethod !== undefined) {
if (typeof transformMethod !== 'function') {
throw new TypeError('transformer.transform is not a function');
}
transformAlgorithm = chunk =>
PromiseCall2(transformMethod, transformer, chunk, controller);
} else {
transformAlgorithm = chunk => {
try {
TransformStreamDefaultControllerEnqueue(controller, chunk);
return createResolvedPromise();
} catch (resultValue) {
return createRejectedPromise(resultValue);
}
};
}
const flushAlgorithm = CreateAlgorithmFromUnderlyingMethod(
transformer, 'flush', 1, 'transformer.flush');
SetUpTransformStreamDefaultController(
stream, controller, transformAlgorithm, flushAlgorithm);
}
function TransformStreamDefaultControllerClearAlgorithms(controller) {
controller[_transformAlgorithm] = undefined;
controller[_flushAlgorithm] = undefined;
}
function TransformStreamDefaultControllerEnqueue(controller, chunk) {
const stream = controller[_controlledTransformStream];
const readableController =
binding.getReadableStreamController(stream[_readable]);
if (!binding.ReadableStreamDefaultControllerCanCloseOrEnqueue(
readableController)) {
throw binding.getReadableStreamEnqueueError(stream[_readable],
readableController);
}
try {
binding.ReadableStreamDefaultControllerEnqueue(readableController, chunk);
} catch (e) {
TransformStreamErrorWritableAndUnblockWrite(stream, e);
throw binding.getReadableStreamStoredError(stream[_readable]);
}
const backpressure = binding.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, controller);
return thenPromise(transformPromise, undefined, r => {
TransformStreamError(controller[_controlledTransformStream], r);
throw r;
});
}
function TransformStreamDefaultControllerTerminate(controller) {
const stream = controller[_controlledTransformStream];
const readableController =
binding.getReadableStreamController(stream[_readable]);
if (binding.ReadableStreamDefaultControllerCanCloseOrEnqueue(
readableController)) {
binding.ReadableStreamDefaultControllerClose(readableController);
}
const error = new TypeError(errStreamTerminated);
TransformStreamErrorWritableAndUnblockWrite(stream, error);
}
function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
const controller = stream[_transformStreamController];
if (stream[_backpressure]) {
const backpressureChangePromise = stream[_backpressureChangePromise];
return thenPromise(backpressureChangePromise, () => {
const writable = stream[_writable];
if (binding.isWritableStreamErroring(writable)) {
throw binding.getWritableStreamStoredError(writable);
}
return TransformStreamDefaultControllerPerformTransform(controller,
chunk);
});
}
return TransformStreamDefaultControllerPerformTransform(controller, chunk);
}
function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
TransformStreamError(stream, reason);
return createResolvedPromise();
}
function TransformStreamDefaultSinkCloseAlgorithm(stream) {
const readable = stream[_readable];
const controller = stream[_transformStreamController];
const flushPromise = controller[_flushAlgorithm](controller);
TransformStreamDefaultControllerClearAlgorithms(controller);
return thenPromise(
flushPromise,
() => {
if (binding.IsReadableStreamErrored(readable)) {
throw binding.getReadableStreamStoredError(readable);
}
const readableController =
binding.getReadableStreamController(readable);
if (binding.ReadableStreamDefaultControllerCanCloseOrEnqueue(
readableController)) {
binding.ReadableStreamDefaultControllerClose(readableController);
}
},
r => {
TransformStreamError(stream, r);
throw binding.getReadableStreamStoredError(readable);
});
}
function TransformStreamDefaultSourcePullAlgorithm(stream) {
TransformStreamSetBackpressure(stream, false);
return stream[_backpressureChangePromise];
}
function createTransformStreamSimple(transformAlgorithm, flushAlgorithm) {
return CreateTransformStream(() => createResolvedPromise(),
transformAlgorithm, flushAlgorithm);
}
function createTransformStream(
transformer, writableStrategy, readableStrategy) {
if (transformer === undefined) {
transformer = ObjectCreate(null);
}
if (writableStrategy === undefined) {
writableStrategy = ObjectCreate(null);
}
if (readableStrategy === undefined) {
readableStrategy = ObjectCreate(null);
}
return new TransformStream(transformer, writableStrategy, readableStrategy);
}
function getTransformStreamReadable(stream) {
return stream[_readable];
}
function getTransformStreamWritable(stream) {
return stream[_writable];
}
Object.assign(binding, {
createTransformStreamSimple,
createTransformStream,
TransformStreamDefaultControllerEnqueue,
getTransformStreamReadable,
getTransformStreamWritable
});
});