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How to use ReadableByteStreamControllerShouldCallPull method in wpt

Best JavaScript code snippet using wpt

ReadableByteStreamInternals.js

Source:ReadableByteStreamInternals.js

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;...

Using AI Code Generation

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)

Using AI Code Generation

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});

Using AI Code Generation

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});

Using AI Code Generation

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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