How to use ReadableByteStreamControllerShouldCallPull method in wpt

Best JavaScript code snippet using wpt

ReadableByteStreamInternals.js

Source:ReadableByteStreamInternals.js Github

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1/*2 * Copyright (C) 2016 Canon Inc. All rights reserved.3 *4 * Redistribution and use in source and binary forms, with or without5 * modification, are permitted provided that the following conditions6 * are met:7 * 1. Redistributions of source code must retain the above copyright8 * notice, this list of conditions and the following disclaimer.9 * 2. Redistributions in binary form must reproduce the above copyright10 * notice, this list of conditions and the following disclaimer in the11 * documentation and/or other materials provided with the distribution.12 *13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.24 */25// @conditional=ENABLE(READABLE_STREAM_API) && ENABLE(READABLE_BYTE_STREAM_API)26// @internal27function privateInitializeReadableByteStreamController(stream, underlyingByteSource, highWaterMark)28{29 "use strict";30 if (!@isReadableStream(stream))31 @throwTypeError("ReadableByteStreamController needs a ReadableStream");32 // readableStreamController is initialized with null value.33 if (stream.@readableStreamController !== null)34 @throwTypeError("ReadableStream already has a controller");35 this.@controlledReadableStream = stream;36 this.@underlyingByteSource = underlyingByteSource;37 this.@pullAgain = false;38 this.@pulling = false;39 @readableByteStreamControllerClearPendingPullIntos(this);40 this.@queue = [];41 this.@totalQueuedBytes = 0;42 this.@started = false;43 this.@closeRequested = false;44 let hwm = @Number(highWaterMark);45 if (@isNaN(hwm) || hwm < 0)46 @throwRangeError("highWaterMark value is negative or not a number");47 this.@strategyHWM = hwm;48 let autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;49 if (autoAllocateChunkSize !== @undefined) {50 autoAllocateChunkSize = @Number(autoAllocateChunkSize);51 if (autoAllocateChunkSize <= 0 || autoAllocateChunkSize === @Number.POSITIVE_INFINITY || autoAllocateChunkSize === @Number.NEGATIVE_INFINITY)52 @throwRangeError("autoAllocateChunkSize value is negative or equal to positive or negative infinity");53 }54 this.@autoAllocateChunkSize = autoAllocateChunkSize;55 this.@pendingPullIntos = [];56 const controller = this;57 const startResult = @promiseInvokeOrNoopNoCatch(underlyingByteSource, "start", [this]).@then(() => {58 controller.@started = true;59 @assert(!controller.@pulling);60 @assert(!controller.@pullAgain);61 @readableByteStreamControllerCallPullIfNeeded(controller);62 }, (error) => {63 if (stream.@state === @streamReadable)64 @readableByteStreamControllerError(controller, error);65 });66 this.@cancel = @readableByteStreamControllerCancel;67 this.@pull = @readableByteStreamControllerPull;68 return this;69}70function privateInitializeReadableStreamBYOBRequest(controller, view)71{72 "use strict";73 this.@associatedReadableByteStreamController = controller;74 this.@view = view;75}76function isReadableByteStreamController(controller)77{78 "use strict";79 // Same test mechanism as in isReadableStreamDefaultController (ReadableStreamInternals.js).80 // See corresponding function for explanations.81 return @isObject(controller) && !!controller.@underlyingByteSource;82}83function isReadableStreamBYOBRequest(byobRequest)84{85 "use strict";86 // Same test mechanism as in isReadableStreamDefaultController (ReadableStreamInternals.js).87 // See corresponding function for explanations.88 return @isObject(byobRequest) && !!byobRequest.@associatedReadableByteStreamController;89}90function isReadableStreamBYOBReader(reader)91{92 "use strict";93 // FIXME: Since BYOBReader is not yet implemented, always return false.94 // To be implemented at the same time as BYOBReader (see isReadableStreamDefaultReader95 // to apply same model).96 return false;97}98function readableByteStreamControllerCancel(controller, reason)99{100 "use strict";101 if (controller.@pendingPullIntos.length > 0)102 controller.@pendingPullIntos[0].bytesFilled = 0;103 controller.@queue = [];104 controller.@totalQueuedBytes = 0;105 return @promiseInvokeOrNoop(controller.@underlyingByteSource, "cancel", [reason]);106}107function readableByteStreamControllerError(controller, e)108{109 "use strict";110 @assert(controller.@controlledReadableStream.@state === @streamReadable);111 @readableByteStreamControllerClearPendingPullIntos(controller);112 controller.@queue = [];113 @readableStreamError(controller.@controlledReadableStream, e);114}115function readableByteStreamControllerClose(controller)116{117 "use strict";118 @assert(!controller.@closeRequested);119 @assert(controller.@controlledReadableStream.@state === @streamReadable);120 if (controller.@totalQueuedBytes > 0) {121 controller.@closeRequested = true;122 return;123 }124 if (controller.@pendingPullIntos.length > 0) {125 if (controller.@pendingPullIntos[0].bytesFilled > 0) {126 const e = new @TypeError("Close requested while there remain pending bytes");127 @readableByteStreamControllerError(controller, e);128 throw e;129 }130 }131 @readableStreamClose(controller.@controlledReadableStream);132}133function readableByteStreamControllerClearPendingPullIntos(controller)134{135 "use strict";136 // FIXME: To be implemented in conjunction with ReadableStreamBYOBRequest.137}138function readableByteStreamControllerGetDesiredSize(controller)139{140 "use strict";141 return controller.@strategyHWM - controller.@totalQueuedBytes;142}143function readableStreamHasBYOBReader(stream)144{145 "use strict";146 return stream.@reader !== @undefined && @isReadableStreamBYOBReader(stream.@reader);147}148function readableStreamHasDefaultReader(stream)149{150 "use strict";151 return stream.@reader !== @undefined && @isReadableStreamDefaultReader(stream.@reader);152}153function readableByteStreamControllerHandleQueueDrain(controller) {154 "use strict";155 @assert(controller.@controlledReadableStream.@state === @streamReadable);156 if (!controller.@totalQueuedBytes && controller.@closeRequested)157 @readableStreamClose(controller.@controlledReadableStream);158 else159 @readableByteStreamControllerCallPullIfNeeded(controller);160}161function readableByteStreamControllerPull(controller)162{163 "use strict";164 const stream = controller.@controlledReadableStream;165 @assert(@readableStreamHasDefaultReader(stream));166 if (controller.@totalQueuedBytes > 0) {167 @assert(stream.@reader.@readRequests.length === 0);168 const entry = controller.@queue.@shift();169 controller.@totalQueuedBytes -= entry.byteLength;170 @readableByteStreamControllerHandleQueueDrain(controller);171 let view;172 try {173 view = new @Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);174 } catch (error) {175 return @Promise.@reject(error);176 }177 return @Promise.@resolve({value: view, done: false});178 }179 if (controller.@autoAllocateChunkSize !== @undefined) {180 let buffer;181 try {182 buffer = new @ArrayBuffer(controller.@autoAllocateChunkSize);183 } catch (error) {184 return @Promise.@reject(error);185 }186 const pullIntoDescriptor = {187 buffer,188 byteOffset: 0,189 byteLength: controller.@autoAllocateChunkSize,190 bytesFilled: 0,191 elementSize: 1,192 ctor: @Uint8Array,193 readerType: 'default'194 };195 controller.@pendingPullIntos.@push(pullIntoDescriptor);196 }197 const promise = @readableStreamAddReadRequest(stream);198 @readableByteStreamControllerCallPullIfNeeded(controller);199 return promise;200}201function readableByteStreamControllerShouldCallPull(controller)202{203 "use strict";204 const stream = controller.@controlledReadableStream;205 if (stream.@state !== @streamReadable)206 return false;207 if (controller.@closeRequested)208 return false;209 if (!controller.@started)210 return false;211 if (@readableStreamHasDefaultReader(stream) && stream.@reader.@readRequests.length > 0)212 return true;213 if (@readableStreamHasBYOBReader(stream) && stream.@reader.@readIntoRequests.length > 0)214 return true;215 if (@readableByteStreamControllerGetDesiredSize(controller) > 0)216 return true;217 return false;218}219function readableByteStreamControllerCallPullIfNeeded(controller)220{221 "use strict";222 if (!@readableByteStreamControllerShouldCallPull(controller))223 return;224 if (controller.@pulling) {225 controller.@pullAgain = true;226 return;227 }228 @assert(!controller.@pullAgain);229 controller.@pulling = true;230 @promiseInvokeOrNoop(controller.@underlyingByteSource, "pull", [controller]).@then(() => {231 controller.@pulling = false;232 if (controller.@pullAgain) {233 controller.@pullAgain = false;234 @readableByteStreamControllerCallPullIfNeeded(controller);235 }236 }, (error) => {237 if (controller.@controlledReadableStream.@state === @streamReadable)238 @readableByteStreamControllerError(controller, error);239 });240}241function transferBufferToCurrentRealm(buffer)242{243 "use strict";244 // FIXME: Determine what should be done here exactly (what is already existing in current245 // codebase and what has to be added). According to spec, Transfer operation should be246 // performed in order to transfer buffer to current realm. For the moment, simply return247 // received buffer.248 return buffer;249}250function readableByteStreamControllerEnqueue(controller, chunk)251{252 "use strict";253 const stream = controller.@controlledReadableStream;254 @assert(!controller.@closeRequested);255 @assert(stream.@state === @streamReadable);256 const buffer = chunk.buffer;257 const byteOffset = chunk.byteOffset;258 const byteLength = chunk.byteLength;259 const transferredBuffer = @transferBufferToCurrentRealm(buffer);260 if (@readableStreamHasDefaultReader(stream)) {261 if (!stream.@reader.@readRequests.length)262 @readableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);263 else {264 @assert(!controller.@queue.length);265 let transferredView = new @Uint8Array(transferredBuffer, byteOffset, byteLength);266 @readableStreamFulfillReadRequest(stream, transferredView, false);267 }268 return;269 }270 if (@readableStreamHasBYOBReader(stream)) {271 // FIXME: To be implemented once ReadableStreamBYOBReader has been implemented (for the moment,272 // test cannot be true).273 @throwTypeError("ReadableByteStreamController enqueue operation has no support for BYOB reader");274 return;275 }276 @assert(!@isReadableStreamLocked(stream));277 @readableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);278}279function readableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength)280{281 "use strict";282 controller.@queue.@push({283 buffer: buffer,284 byteOffset: byteOffset,285 byteLength: byteLength286 });287 controller.@totalQueuedBytes += byteLength;...

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Using AI Code Generation

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1const { ReadableStream, CountQueuingStrategy } = require('stream/web');2const rs = new ReadableStream({3 pull(controller) {4 controller.enqueue('a');5 controller.close();6 }7}, new CountQueuingStrategy({ highWaterMark: 1 }));8const reader = rs.getReader();9const read = reader.read();10read.then(console.log);11read.then(console.log);12 at Function.from (buffer.js:315:9)13 at ReadableByteStreamControllerShouldCallPull (internal/streams/readable.js:1017:25)14 at ReadableStreamDefaultControllerCallPullIfNeeded (internal/streams/readable.js:1012:3)15 at ReadableStreamDefaultControllerClose (internal/streams/readable.js:1052:5)16 at ReadableStreamClose (internal/streams/readable.js:1059:3)17 at ReadableStream.cancel (internal/streams/readable.js:1038:5)18 at ReadableStream.cancel (internal/streams/whatwg.js:67:24)19 at ReadableStream.cancel (internal/streams/whatwg.js:67:24)20 at ReadableStream.cancel (internal/streams/whatwg.js:67:24)21 at ReadableStream.cancel (internal/streams/whatwg.js:67:24)

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Using AI Code Generation

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1'use strict';2const { ReadableStream, CountQueuingStrategy } = require('stream/web');3const { ReadableByteStreamControllerShouldCallPull } = require('./resources/readable-byte-stream-controller');4const { assert_equals } = require('../util/assert');5const rs = new ReadableStream({6 pull(controller) {7 ReadableByteStreamControllerShouldCallPull(controller);8 }9}, new CountQueuingStrategy({ highWaterMark: 0 }));10rs.getReader().read().then(({ value, done }) => {11 assert_equals(value, null);12 assert_equals(done, true);13});

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Using AI Code Generation

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1var rs = new ReadableStream({2 pull: function(controller) {3 controller.enqueue(new Uint8Array([1, 2, 3]));4 controller.close();5 }6});7var reader = rs.getReader();8var readPromise = reader.read();9readPromise.then(function(result) {10 assert_array_equals(result.value, [1, 2, 3]);11 assert_false(result.done);12 return reader.read();13}).then(function(result) {14 assert_equals(result.value, undefined);15 assert_true(result.done);16});

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Using AI Code Generation

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1var rs = new ReadableStream({2 pull: function(controller) {3 controller.shouldCallPull = false;4 }5});6var reader = rs.getReader();7reader.read().then(function(result) {8 assert_equals(result.value, undefined);9 assert_true(result.done);10}, function(e) {11 assert_unreached(e);12});13var rs = new ReadableStream({14 pull: function(controller) {15 controller.shouldCallPull = true;16 }17});18var reader = rs.getReader();19reader.read().then(function(result) {20 assert_equals(result.value, undefined);21 assert_true(result.done);22}, function(e) {23 assert_unreached(e);24});25var rs = new ReadableStream({26 pull: function(controller) {27 controller.shouldCallPull = true;28 }29});30var reader = rs.getReader();31reader.read().then(function(result) {32 assert_equals(result.value, undefined);33 assert_true(result.done);34}, function(e) {35 assert_unreached(e);36});37var rs = new ReadableStream({38 pull: function(controller) {39 controller.enqueue(new Uint8Array([1, 2, 3]));40 }41});42var reader = rs.getReader();43var promise = reader.read(new Uint8Array(3));44promise.then(function(result) {45 assert_equals(result.value[0], 1);46 assert_equals(result.value[1], 2);47 assert_equals(result.value[2], 3);48 assert_false(result.done);49 return reader.read(new Uint8Array

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