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How to use byobRequestBrandCheckException method in wpt

Best JavaScript code snippet using wpt

readable.js

Source:readable.js

...928      throw new TypeError('ReadableStreamBYOBRequest cannot be used directly');929    }930    get view() {931      if (IsReadableStreamBYOBRequest(this) === false) {932        throw byobRequestBrandCheckException('view');933      }934      return this[kView];935    }936    respond(bytesWritten) {937      if (IsReadableStreamBYOBRequest(this) === false) {938        throw byobRequestBrandCheckException('respond');939      }940      if (this[kAssociatedReadableByteStreamController] === undefined) {941        throw new TypeError('This BYOB request has been invalidated');942      }943      if (IsDetachedBuffer(this[kView].buffer) === true) {944        throw new TypeError('The BYOB request\'s buffer has been detached and so cannot be used as a response');945      }946      ReadableByteStreamControllerRespond(this[kAssociatedReadableByteStreamController], bytesWritten);947    }948    respondWithNewView(view) {949      if (IsReadableStreamBYOBRequest(this) === false) {950        throw byobRequestBrandCheckException('respond');951      }952      if (this[kAssociatedReadableByteStreamController] === undefined) {953        throw new TypeError('This BYOB request has been invalidated');954      }955      if (!ArrayBuffer.isView(view)) {956        throw new TypeError('You can only respond with array buffer views');957      }958      if (IsDetachedBuffer(view.buffer) === true) {959        throw new TypeError('The supplied view\'s buffer has been detached and so cannot be used as a response');960      }961      ReadableByteStreamControllerRespondWithNewView(this[kAssociatedReadableByteStreamController], view);962    }963  }964  class ReadableByteStreamController {965    constructor() {966      throw new TypeError('ReadableByteStreamController constructor cannot be used directly');967    }968    get byobRequest() {969      if (IsReadableByteStreamController(this) === false) {970        throw byteStreamControllerBrandCheckException('byobRequest');971      }972      if (this[kByobRequest] === undefined && this[kPendingPullIntos].length > 0) {973        const firstDescriptor = this[kPendingPullIntos][0];974        const view = new Uint8Array(firstDescriptor.buffer,975          firstDescriptor.byteOffset + firstDescriptor.bytesFilled,976          firstDescriptor.byteLength - firstDescriptor.bytesFilled);977        const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);978        SetUpReadableStreamBYOBRequest(byobRequest, this, view);979        this[kByobRequest] = byobRequest;980      }981      return this[kByobRequest];982    }983    get desiredSize() {984      if (IsReadableByteStreamController(this) === false) {985        throw byteStreamControllerBrandCheckException('desiredSize');986      }987      return ReadableByteStreamControllerGetDesiredSize(this);988    }989    close() {990      if (IsReadableByteStreamController(this) === false) {991        throw byteStreamControllerBrandCheckException('close');992      }993      if (this[kCloseRequested] === true) {994        throw new TypeError('The stream has already been closed; do not close it again!');995      }996      const state = this[kControlledReadableByteStream][kState];997      if (state !== 'readable') {998        throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);999      }1000      ReadableByteStreamControllerClose(this);1001    }1002    enqueue(chunk) {1003      if (IsReadableByteStreamController(this) === false) {1004        throw byteStreamControllerBrandCheckException('enqueue');1005      }1006      if (this[kCloseRequested] === true) {1007        throw new TypeError('stream is closed or draining');1008      }1009      const state = this[kControlledReadableByteStream][kState];1010      if (state !== 'readable') {1011        throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);1012      }1013      if (!ArrayBuffer.isView(chunk)) {1014        throw new TypeError('You can only enqueue array buffer views when using a ReadableByteStreamController');1015      }1016      if (IsDetachedBuffer(chunk.buffer) === true) {1017        throw new TypeError('Cannot enqueue a view onto a detached ArrayBuffer');1018      }1019      ReadableByteStreamControllerEnqueue(this, chunk);1020    }1021    error(e) {1022      if (IsReadableByteStreamController(this) === false) {1023        throw byteStreamControllerBrandCheckException('error');1024      }1025      ReadableByteStreamControllerError(this, e);1026    }1027    [CancelSteps](reason) {1028      if (this[kPendingPullIntos].length > 0) {1029        const firstDescriptor = this[kPendingPullIntos][0];1030        firstDescriptor.bytesFilled = 0;1031      }1032      ResetQueue(this);1033      return this[kCancelAlgorithm](reason);1034    }1035    [PullSteps]() {1036      const stream = this[kControlledReadableByteStream];1037      assert(ReadableStreamHasDefaultReader(stream) === true);1038      if (this[kQueueTotalSize] > 0) {1039        assert(ReadableStreamGetNumReadRequests(stream) === 0);1040        const entry = this[kQueue].shift();1041        this[kQueueTotalSize] -= entry.byteLength;1042        ReadableByteStreamControllerHandleQueueDrain(this);1043        let view;1044        try {1045          view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);1046        } catch (viewE) {1047          return Promise.reject(viewE);1048        }1049        return Promise.resolve(CreateIterResultObject(view, false));1050      }1051      const autoAllocateChunkSize = this[kAutoAllocateChunkSize];1052      if (autoAllocateChunkSize !== undefined) {1053        let buffer;1054        try {1055          buffer = new ArrayBuffer(autoAllocateChunkSize);1056        } catch (bufferE) {1057          return Promise.reject(bufferE);1058        }1059        const pullIntoDescriptor = {1060          buffer,1061          byteOffset: 0,1062          byteLength: autoAllocateChunkSize,1063          bytesFilled: 0,1064          elementSize: 1,1065          ctor: Uint8Array,1066          readerType: 'default',1067        };1068        this[kPendingPullIntos].push(pullIntoDescriptor);1069      }1070      const promise = ReadableStreamAddReadRequest(stream);1071      ReadableByteStreamControllerCallPullIfNeeded(this);1072      return promise;1073    }1074  }1075  // Abstract operations for the ReadableByteStreamController.1076  function IsReadableByteStreamController(x) {1077    if (!typeIsObject(x)) {1078      return false;1079    }1080    if (!Object.prototype.hasOwnProperty.call(x, kControlledReadableByteStream)) {1081      return false;1082    }1083    return true;1084  }1085  function IsReadableStreamBYOBRequest(x) {1086    if (!typeIsObject(x)) {1087      return false;1088    }1089    if (!Object.prototype.hasOwnProperty.call(x, kAssociatedReadableByteStreamController)) {1090      return false;1091    }1092    return true;1093  }1094  function ReadableByteStreamControllerCallPullIfNeeded(controller) {1095    const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);1096    if (shouldPull === false) {1097      return undefined;1098    }1099    if (controller[kPulling] === true) {1100      controller[kPullAgain] = true;1101      return undefined;1102    }1103    assert(controller[kPullAgain] === false);1104    controller[kPulling] = true;1105    // TODO: Test controller argument1106    const pullPromise = controller[kPullAlgorithm]();1107    pullPromise.then(1108      () => {1109        controller[kPulling] = false;1110        if (controller[kPullAgain] === true) {1111          controller[kPullAgain] = false;1112          ReadableByteStreamControllerCallPullIfNeeded(controller);1113        }1114      },1115      (e) => {1116        ReadableByteStreamControllerError(controller, e);1117      },1118    )1119      .catch(rethrowAssertionErrorRejection);1120    return undefined;1121  }1122  function ReadableByteStreamControllerClearPendingPullIntos(controller) {1123    ReadableByteStreamControllerInvalidateBYOBRequest(controller);1124    controller[kPendingPullIntos] = [];1125  }1126  function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {1127    assert(stream[kState] !== 'errored');1128    let done = false;1129    if (stream[kState] === 'closed') {1130      assert(pullIntoDescriptor.bytesFilled === 0);1131      done = true;1132    }1133    const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);1134    if (pullIntoDescriptor.readerType === 'default') {1135      ReadableStreamFulfillReadRequest(stream, filledView, done);1136    } else {1137      assert(pullIntoDescriptor.readerType === 'byob');1138      ReadableStreamFulfillReadIntoRequest(stream, filledView, done);1139    }1140  }1141  function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {1142    const bytesFilled = pullIntoDescriptor.bytesFilled;1143    const elementSize = pullIntoDescriptor.elementSize;1144    assert(bytesFilled <= pullIntoDescriptor.byteLength);1145    assert(bytesFilled % elementSize === 0);1146    return new pullIntoDescriptor.ctor( // eslint-disable-line new-cap1147      pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize,1148    );1149  }1150  function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {1151    controller[kQueue].push({ buffer, byteOffset, byteLength });1152    controller[kQueueTotalSize] += byteLength;1153  }1154  function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {1155    const elementSize = pullIntoDescriptor.elementSize;1156    const currentAlignedBytes = pullIntoDescriptor.bytesFilled - (pullIntoDescriptor.bytesFilled % elementSize);1157    const maxBytesToCopy = Math.min(controller[kQueueTotalSize],1158      pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);1159    const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;1160    const maxAlignedBytes = maxBytesFilled - (maxBytesFilled % elementSize);1161    let totalBytesToCopyRemaining = maxBytesToCopy;1162    let ready = false;1163    if (maxAlignedBytes > currentAlignedBytes) {1164      totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;1165      ready = true;1166    }1167    const queue = controller[kQueue];1168    while (totalBytesToCopyRemaining > 0) {1169      const headOfQueue = queue[0];1170      const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);1171      const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;1172      ArrayBufferCopy(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);1173      if (headOfQueue.byteLength === bytesToCopy) {1174        queue.shift();1175      } else {1176        headOfQueue.byteOffset += bytesToCopy;1177        headOfQueue.byteLength -= bytesToCopy;1178      }1179      controller[kQueueTotalSize] -= bytesToCopy;1180      ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);1181      totalBytesToCopyRemaining -= bytesToCopy;1182    }1183    if (ready === false) {1184      assert(controller[kQueueTotalSize] === 0);1185      assert(pullIntoDescriptor.bytesFilled > 0);1186      assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);1187    }1188    return ready;1189  }1190  function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {1191    assert(controller[kPendingPullIntos].length === 0 || controller[kPendingPullIntos][0] === pullIntoDescriptor);1192    ReadableByteStreamControllerInvalidateBYOBRequest(controller);1193    pullIntoDescriptor.bytesFilled += size;1194  }1195  function ReadableByteStreamControllerHandleQueueDrain(controller) {1196    assert(controller[kControlledReadableByteStream][kState] === 'readable');1197    if (controller[kQueueTotalSize] === 0 && controller[kCloseRequested] === true) {1198      ReadableStreamClose(controller[kControlledReadableByteStream]);1199    } else {1200      ReadableByteStreamControllerCallPullIfNeeded(controller);1201    }1202  }1203  function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {1204    if (controller[kByobRequest] === undefined) {1205      return;1206    }1207    controller[kByobRequest][kAssociatedReadableByteStreamController] = undefined;1208    controller[kByobRequest][kView] = undefined;1209    controller[kByobRequest] = undefined;1210  }1211  function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {1212    assert(controller[kCloseRequested] === false);1213    while (controller[kPendingPullIntos].length > 0) {1214      if (controller[kQueueTotalSize] === 0) {1215        return;1216      }1217      const pullIntoDescriptor = controller[kPendingPullIntos][0];1218      if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) === true) {1219        ReadableByteStreamControllerShiftPendingPullInto(controller);1220        ReadableByteStreamControllerCommitPullIntoDescriptor(1221          controller[kControlledReadableByteStream],1222          pullIntoDescriptor,1223        );1224      }1225    }1226  }1227  function ReadableByteStreamControllerPullInto(controller, view) {1228    const stream = controller[kControlledReadableByteStream];1229    let elementSize = 1;1230    if (view.constructor !== DataView) {1231      elementSize = view.constructor.BYTES_PER_ELEMENT;1232    }1233    const ctor = view.constructor;1234    const buffer = TransferArrayBuffer(view.buffer);1235    const pullIntoDescriptor = {1236      buffer,1237      byteOffset: view.byteOffset,1238      byteLength: view.byteLength,1239      bytesFilled: 0,1240      elementSize,1241      ctor,1242      readerType: 'byob',1243    };1244    if (controller[kPendingPullIntos].length > 0) {1245      controller[kPendingPullIntos].push(pullIntoDescriptor);1246      // No ReadableByteStreamControllerCallPullIfNeeded() call since:1247      // - No change happens on desiredSize1248      // - The source has already been notified of that there's at least 1 pending read(view)1249      return ReadableStreamAddReadIntoRequest(stream);1250    }1251    if (stream[kState] === 'closed') {1252      const emptyView = new view.constructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);1253      return Promise.resolve(CreateIterResultObject(emptyView, true));1254    }1255    if (controller[kQueueTotalSize] > 0) {1256      if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) === true) {1257        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);1258        ReadableByteStreamControllerHandleQueueDrain(controller);1259        return Promise.resolve(CreateIterResultObject(filledView, false));1260      }1261      if (controller[kCloseRequested] === true) {1262        const e = new TypeError('Insufficient bytes to fill elements in the given buffer');1263        ReadableByteStreamControllerError(controller, e);1264        return Promise.reject(e);1265      }1266    }1267    controller[kPendingPullIntos].push(pullIntoDescriptor);1268    const promise = ReadableStreamAddReadIntoRequest(stream);1269    ReadableByteStreamControllerCallPullIfNeeded(controller);1270    return promise;1271  }1272  function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {1273    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);1274    assert(firstDescriptor.bytesFilled === 0);1275    const stream = controller[kControlledReadableByteStream];1276    if (ReadableStreamHasBYOBReader(stream) === true) {1277      while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {1278        const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);1279        ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);1280      }1281    }1282  }1283  function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {1284    if (pullIntoDescriptor.bytesFilled + bytesWritten > pullIntoDescriptor.byteLength) {1285      throw new RangeError('bytesWritten out of range');1286    }1287    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);1288    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {1289      // TODO: Figure out whether we should detach the buffer or not here.1290      return;1291    }1292    ReadableByteStreamControllerShiftPendingPullInto(controller);1293    const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;1294    if (remainderSize > 0) {1295      const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;1296      const remainder = pullIntoDescriptor.buffer.slice(end - remainderSize, end);1297      ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);1298    }1299    pullIntoDescriptor.buffer = TransferArrayBuffer(pullIntoDescriptor.buffer);1300    pullIntoDescriptor.bytesFilled -= remainderSize;1301    ReadableByteStreamControllerCommitPullIntoDescriptor(controller[kControlledReadableByteStream], pullIntoDescriptor);1302    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);1303  }1304  function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {1305    const firstDescriptor = controller[kPendingPullIntos][0];1306    const stream = controller[kControlledReadableByteStream];1307    if (stream[kState] === 'closed') {1308      if (bytesWritten !== 0) {1309        throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');1310      }1311      ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);1312    } else {1313      assert(stream[kState] === 'readable');1314      ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);1315    }1316    ReadableByteStreamControllerCallPullIfNeeded(controller);1317  }1318  function ReadableByteStreamControllerShiftPendingPullInto(controller) {1319    const descriptor = controller[kPendingPullIntos].shift();1320    ReadableByteStreamControllerInvalidateBYOBRequest(controller);1321    return descriptor;1322  }1323  function ReadableByteStreamControllerShouldCallPull(controller) {1324    const stream = controller[kControlledReadableByteStream];1325    if (stream[kState] !== 'readable') {1326      return false;1327    }1328    if (controller[kCloseRequested] === true) {1329      return false;1330    }1331    if (controller[kStarted] === false) {1332      return false;1333    }1334    if (ReadableStreamHasDefaultReader(stream) === true && ReadableStreamGetNumReadRequests(stream) > 0) {1335      return true;1336    }1337    if (ReadableStreamHasBYOBReader(stream) === true && ReadableStreamGetNumReadIntoRequests(stream) > 0) {1338      return true;1339    }1340    const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);1341    assert(desiredSize !== null);1342    if (desiredSize > 0) {1343      return true;1344    }1345    return false;1346  }1347  // A client of ReadableByteStreamController may use these functions directly to bypass state check.1348  function ReadableByteStreamControllerClose(controller) {1349    const stream = controller[kControlledReadableByteStream];1350    assert(controller[kCloseRequested] === false);1351    assert(stream[kState] === 'readable');1352    if (controller[kQueueTotalSize] > 0) {1353      controller[kCloseRequested] = true;1354      return;1355    }1356    if (controller[kPendingPullIntos].length > 0) {1357      const firstPendingPullInto = controller[kPendingPullIntos][0];1358      if (firstPendingPullInto.bytesFilled > 0) {1359        const e = new TypeError('Insufficient bytes to fill elements in the given buffer');1360        ReadableByteStreamControllerError(controller, e);1361        throw e;1362      }1363    }1364    ReadableStreamClose(stream);1365  }1366  function ReadableByteStreamControllerEnqueue(controller, chunk) {1367    const stream = controller[kControlledReadableByteStream];1368    assert(controller[kCloseRequested] === false);1369    assert(stream[kState] === 'readable');1370    const buffer = chunk.buffer;1371    const byteOffset = chunk.byteOffset;1372    const byteLength = chunk.byteLength;1373    const transferredBuffer = TransferArrayBuffer(buffer);1374    if (ReadableStreamHasDefaultReader(stream) === true) {1375      if (ReadableStreamGetNumReadRequests(stream) === 0) {1376        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);1377      } else {1378        assert(controller[kQueue].length === 0);1379        const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);1380        ReadableStreamFulfillReadRequest(stream, transferredView, false);1381      }1382    } else if (ReadableStreamHasBYOBReader(stream) === true) {1383      // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.1384      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);1385      ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);1386    } else {1387      assert(IsReadableStreamLocked(stream) === false);1388      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);1389    }1390    ReadableByteStreamControllerCallPullIfNeeded(controller);1391  }1392  function ReadableByteStreamControllerError(controller, e) {1393    const stream = controller[kControlledReadableByteStream];1394    if (stream[kState] !== 'readable') {1395      return;1396    }1397    ReadableByteStreamControllerClearPendingPullIntos(controller);1398    ResetQueue(controller);1399    ReadableStreamError(stream, e);1400  }1401  function ReadableByteStreamControllerGetDesiredSize(controller) {1402    const stream = controller[kControlledReadableByteStream];1403    const state = stream[kState];1404    if (state === 'errored') {1405      return null;1406    }1407    if (state === 'closed') {1408      return 0;1409    }1410    return controller[kStrategyHWM] - controller[kQueueTotalSize];1411  }1412  function ReadableByteStreamControllerRespond(controller, bytesWritten) {1413    bytesWritten = Number(bytesWritten);1414    if (IsFiniteNonNegativeNumber(bytesWritten) === false) {1415      throw new RangeError('bytesWritten must be a finite');1416    }1417    assert(controller[kPendingPullIntos].length > 0);1418    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);1419  }1420  function ReadableByteStreamControllerRespondWithNewView(controller, view) {1421    assert(controller[kPendingPullIntos].length > 0);1422    const firstDescriptor = controller[kPendingPullIntos][0];1423    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {1424      throw new RangeError('The region specified by view does not match byobRequest');1425    }1426    if (firstDescriptor.byteLength !== view.byteLength) {1427      throw new RangeError('The buffer of view has different capacity than byobRequest');1428    }1429    firstDescriptor.buffer = view.buffer;1430    ReadableByteStreamControllerRespondInternal(controller, view.byteLength);1431  }1432  function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm,1433    highWaterMark, autoAllocateChunkSize) {1434    assert(stream[kReadableStreamController] === undefined);1435    if (autoAllocateChunkSize !== undefined) {1436      assert(Number.isInteger(autoAllocateChunkSize) === true);1437      assert(autoAllocateChunkSize > 0);1438    }1439    controller[kControlledReadableByteStream] = stream;1440    controller[kPullAgain] = false;1441    controller[kPulling] = false;1442    ReadableByteStreamControllerClearPendingPullIntos(controller);1443    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.1444    controller[kQueue] = controller[kQueueTotalSize] = undefined;1445    ResetQueue(controller);1446    controller[kCloseRequested] = false;1447    controller[kStarted] = false;1448    controller[kStrategyHWM] = ValidateAndNormalizeHighWaterMark(highWaterMark);1449    controller[kPullAlgorithm] = pullAlgorithm;1450    controller[kCancelAlgorithm] = cancelAlgorithm;1451    controller[kAutoAllocateChunkSize] = autoAllocateChunkSize;1452    controller[kPendingPullIntos] = [];1453    stream[kReadableStreamController] = controller;1454    const startResult = startAlgorithm();1455    Promise.resolve(startResult).then(1456      () => {1457        controller[kStarted] = true;1458        assert(controller[kPulling] === false);1459        assert(controller[kPullAgain] === false);1460        ReadableByteStreamControllerCallPullIfNeeded(controller);1461      },1462      (r) => {1463        ReadableByteStreamControllerError(controller, r);1464      },1465    )1466      .catch(rethrowAssertionErrorRejection);1467  }1468  function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {1469    assert(underlyingByteSource !== undefined);1470    const controller = Object.create(ReadableByteStreamController.prototype);1471    function startAlgorithm() {1472      return InvokeOrNoop(underlyingByteSource, 'start', [controller]);1473    }1474    const pullAlgorithm = CreateAlgorithmFromUnderlyingMethod(underlyingByteSource, 'pull', 0, [controller]);1475    const cancelAlgorithm = CreateAlgorithmFromUnderlyingMethod(underlyingByteSource, 'cancel', 1, []);1476    let autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;1477    if (autoAllocateChunkSize !== undefined) {1478      autoAllocateChunkSize = Number(autoAllocateChunkSize);1479      if (Number.isInteger(autoAllocateChunkSize) === false || autoAllocateChunkSize <= 0) {1480        throw new RangeError('autoAllocateChunkSize must be a positive integer');1481      }1482    }1483    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark,1484      autoAllocateChunkSize);1485  }1486  function SetUpReadableStreamBYOBRequest(request, controller, view) {1487    assert(IsReadableByteStreamController(controller) === true);1488    assert(typeof view === 'object');1489    assert(ArrayBuffer.isView(view) === true);1490    assert(IsDetachedBuffer(view.buffer) === false);1491    request[kAssociatedReadableByteStreamController] = controller;1492    request[kView] = view;1493  }1494  // Helper functions for the ReadableStream.1495  function streamBrandCheckException(name) {1496    return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);1497  }1498  // Helper functions for the readers.1499  function readerLockException(name) {1500    return new TypeError(`Cannot ${name} a stream using a released reader`);1501  }1502  // Helper functions for the ReadableStreamDefaultReader.1503  function defaultReaderBrandCheckException(name) {1504    return new TypeError(1505      `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`,1506    );1507  }1508  function defaultReaderClosedPromiseInitialize(reader) {1509    reader[kClosedPromise] = new Promise((resolve, reject) => {1510      reader[kClosedPromiseResolve] = resolve;1511      reader[kClosedPromiseReject] = reject;1512    });1513  }1514  function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {1515    reader[kClosedPromise] = Promise.reject(reason);1516    reader[kClosedPromiseResolve] = undefined;1517    reader[kClosedPromiseReject] = undefined;1518  }1519  function defaultReaderClosedPromiseInitializeAsResolved(reader) {1520    reader[kClosedPromise] = Promise.resolve(undefined);1521    reader[kClosedPromiseResolve] = undefined;1522    reader[kClosedPromiseReject] = undefined;1523  }1524  function defaultReaderClosedPromiseReject(reader, reason) {1525    assert(reader[kClosedPromiseResolve] !== undefined);1526    assert(reader[kClosedPromiseReject] !== undefined);1527    reader[kClosedPromiseReject](reason);1528    reader[kClosedPromiseResolve] = undefined;1529    reader[kClosedPromiseReject] = undefined;1530  }1531  function defaultReaderClosedPromiseResetToRejected(reader, reason) {1532    assert(reader[kClosedPromiseResolve] === undefined);1533    assert(reader[kClosedPromiseReject] === undefined);1534    reader[kClosedPromise] = Promise.reject(reason);1535  }1536  function defaultReaderClosedPromiseResolve(reader) {1537    assert(reader[kClosedPromiseResolve] !== undefined);1538    assert(reader[kClosedPromiseReject] !== undefined);1539    reader[kClosedPromiseResolve](undefined);1540    reader[kClosedPromiseResolve] = undefined;1541    reader[kClosedPromiseReject] = undefined;1542  }1543  // Helper functions for the ReadableStreamDefaultReader.1544  function byobReaderBrandCheckException(name) {1545    return new TypeError(1546      `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`,1547    );1548  }1549  // Helper functions for the ReadableStreamDefaultController.1550  function defaultControllerBrandCheckException(name) {1551    return new TypeError(1552      `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`,1553    );1554  }1555  // Helper functions for the ReadableStreamBYOBRequest.1556  function byobRequestBrandCheckException(name) {1557    return new TypeError(1558      `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`,1559    );1560  }1561  // Helper functions for the ReadableByteStreamController.1562  function byteStreamControllerBrandCheckException(name) {1563    return new TypeError(1564      `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`,1565    );1566  }1567  // Helper function for ReadableStream pipeThrough1568  function ifIsObjectAndHasAPromiseIsHandledInternalSlotSetPromiseIsHandledToTrue(promise) {1569    try {1570      // This relies on the brand-check that is enforced by Promise.prototype.then(). As with the rest of the reference...

byte-stream-controller.ts

Source:byte-stream-controller.ts

...46   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.47   */48  get view(): ArrayBufferView | null {49    if (!IsReadableStreamBYOBRequest(this)) {50      throw byobRequestBrandCheckException('view');51    }52    return this._view;53  }54  /**55   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into56   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.57   *58   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer59   * modifiable.60   */61  respond(bytesWritten: number): void;62  respond(bytesWritten: number | undefined): void {63    if (!IsReadableStreamBYOBRequest(this)) {64      throw byobRequestBrandCheckException('respond');65    }66    assertRequiredArgument(bytesWritten, 1, 'respond');67    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');68    if (this._associatedReadableByteStreamController === undefined) {69      throw new TypeError('This BYOB request has been invalidated');70    }71    if (IsDetachedBuffer(this._view!.buffer)) {72      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);73    }74    assert(this._view!.byteLength > 0);75    assert(this._view!.buffer.byteLength > 0);76    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);77  }78  /**79   * Indicates to the associated readable byte stream that instead of writing into80   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,81   * which will be given to the consumer of the readable byte stream.82   *83   * After this method is called, `view` will be transferred and no longer modifiable.84   */85  respondWithNewView(view: ArrayBufferView): void;86  respondWithNewView(view: ArrayBufferView | undefined): void {87    if (!IsReadableStreamBYOBRequest(this)) {88      throw byobRequestBrandCheckException('respondWithNewView');89    }90    assertRequiredArgument(view, 1, 'respondWithNewView');91    if (!ArrayBuffer.isView(view)) {92      throw new TypeError('You can only respond with array buffer views');93    }94    if (view.byteLength === 0) {95      throw new TypeError('chunk must have non-zero byteLength');96    }97    if (view.buffer.byteLength === 0) {98      throw new TypeError(`chunk's buffer must have non-zero byteLength`);99    }100    if (this._associatedReadableByteStreamController === undefined) {101      throw new TypeError('This BYOB request has been invalidated');102    }103    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);104  }105}106Object.defineProperties(ReadableStreamBYOBRequest.prototype, {107  respond: { enumerable: true },108  respondWithNewView: { enumerable: true },109  view: { enumerable: true }110});111if (typeof Symbol.toStringTag === 'symbol') {112  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {113    value: 'ReadableStreamBYOBRequest',114    configurable: true115  });116}117interface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {118  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;119  readonly prototype: T;120  readonly BYTES_PER_ELEMENT: number;121}122interface ByteQueueElement {123  buffer: ArrayBufferLike;124  byteOffset: number;125  byteLength: number;126}127type PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =128  DefaultPullIntoDescriptor129  | BYOBPullIntoDescriptor;130interface DefaultPullIntoDescriptor {131  buffer: ArrayBufferLike;132  byteOffset: number;133  byteLength: number;134  bytesFilled: number;135  elementSize: number;136  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;137  readerType: 'default';138}139interface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {140  buffer: ArrayBufferLike;141  byteOffset: number;142  byteLength: number;143  bytesFilled: number;144  elementSize: number;145  viewConstructor: ArrayBufferViewConstructor<T>;146  readerType: 'byob';147}148/**149 * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.150 *151 * @public152 */153export class ReadableByteStreamController {154  /** @internal */155  _controlledReadableByteStream!: ReadableByteStream;156  /** @internal */157  _queue!: SimpleQueue<ByteQueueElement>;158  /** @internal */159  _queueTotalSize!: number;160  /** @internal */161  _started!: boolean;162  /** @internal */163  _closeRequested!: boolean;164  /** @internal */165  _pullAgain!: boolean;166  /** @internal */167  _pulling !: boolean;168  /** @internal */169  _strategyHWM!: number;170  /** @internal */171  _pullAlgorithm!: () => Promise<void>;172  /** @internal */173  _cancelAlgorithm!: (reason: any) => Promise<void>;174  /** @internal */175  _autoAllocateChunkSize: number | undefined;176  /** @internal */177  _byobRequest: ReadableStreamBYOBRequest | null;178  /** @internal */179  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;180  private constructor() {181    throw new TypeError('Illegal constructor');182  }183  /**184   * Returns the current BYOB pull request, or `null` if there isn't one.185   */186  get byobRequest(): ReadableStreamBYOBRequest | null {187    if (!IsReadableByteStreamController(this)) {188      throw byteStreamControllerBrandCheckException('byobRequest');189    }190    if (this._byobRequest === null && this._pendingPullIntos.length > 0) {191      const firstDescriptor = this._pendingPullIntos.peek();192      const view = new Uint8Array(firstDescriptor.buffer,193                                  firstDescriptor.byteOffset + firstDescriptor.bytesFilled,194                                  firstDescriptor.byteLength - firstDescriptor.bytesFilled);195      const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);196      SetUpReadableStreamBYOBRequest(byobRequest, this, view);197      this._byobRequest = byobRequest;198    }199    return this._byobRequest;200  }201  /**202   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is203   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.204   */205  get desiredSize(): number | null {206    if (!IsReadableByteStreamController(this)) {207      throw byteStreamControllerBrandCheckException('desiredSize');208    }209    return ReadableByteStreamControllerGetDesiredSize(this);210  }211  /**212   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from213   * the stream, but once those are read, the stream will become closed.214   */215  close(): void {216    if (!IsReadableByteStreamController(this)) {217      throw byteStreamControllerBrandCheckException('close');218    }219    if (this._closeRequested) {220      throw new TypeError('The stream has already been closed; do not close it again!');221    }222    const state = this._controlledReadableByteStream._state;223    if (state !== 'readable') {224      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);225    }226    ReadableByteStreamControllerClose(this);227  }228  /**229   * Enqueues the given chunk chunk in the controlled readable stream.230   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.231   */232  enqueue(chunk: ArrayBufferView): void;233  enqueue(chunk: ArrayBufferView | undefined): void {234    if (!IsReadableByteStreamController(this)) {235      throw byteStreamControllerBrandCheckException('enqueue');236    }237    assertRequiredArgument(chunk, 1, 'enqueue');238    if (!ArrayBuffer.isView(chunk)) {239      throw new TypeError('chunk must be an array buffer view');240    }241    if (chunk.byteLength === 0) {242      throw new TypeError('chunk must have non-zero byteLength');243    }244    if (chunk.buffer.byteLength === 0) {245      throw new TypeError(`chunk's buffer must have non-zero byteLength`);246    }247    if (this._closeRequested) {248      throw new TypeError('stream is closed or draining');249    }250    const state = this._controlledReadableByteStream._state;251    if (state !== 'readable') {252      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);253    }254    ReadableByteStreamControllerEnqueue(this, chunk);255  }256  /**257   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.258   */259  error(e: any = undefined): void {260    if (!IsReadableByteStreamController(this)) {261      throw byteStreamControllerBrandCheckException('error');262    }263    ReadableByteStreamControllerError(this, e);264  }265  /** @internal */266  [CancelSteps](reason: any): Promise<void> {267    if (this._pendingPullIntos.length > 0) {268      const firstDescriptor = this._pendingPullIntos.peek();269      firstDescriptor.bytesFilled = 0;270    }271    ResetQueue(this);272    const result = this._cancelAlgorithm(reason);273    ReadableByteStreamControllerClearAlgorithms(this);274    return result;275  }276  /** @internal */277  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {278    const stream = this._controlledReadableByteStream;279    assert(ReadableStreamHasDefaultReader(stream));280    if (this._queueTotalSize > 0) {281      assert(ReadableStreamGetNumReadRequests(stream) === 0);282      const entry = this._queue.shift()!;283      this._queueTotalSize -= entry.byteLength;284      ReadableByteStreamControllerHandleQueueDrain(this);285      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);286      readRequest._chunkSteps(view);287      return;288    }289    const autoAllocateChunkSize = this._autoAllocateChunkSize;290    if (autoAllocateChunkSize !== undefined) {291      let buffer: ArrayBuffer;292      try {293        buffer = new ArrayBuffer(autoAllocateChunkSize);294      } catch (bufferE) {295        readRequest._errorSteps(bufferE);296        return;297      }298      const pullIntoDescriptor: DefaultPullIntoDescriptor = {299        buffer,300        byteOffset: 0,301        byteLength: autoAllocateChunkSize,302        bytesFilled: 0,303        elementSize: 1,304        viewConstructor: Uint8Array,305        readerType: 'default'306      };307      this._pendingPullIntos.push(pullIntoDescriptor);308    }309    ReadableStreamAddReadRequest(stream, readRequest);310    ReadableByteStreamControllerCallPullIfNeeded(this);311  }312}313Object.defineProperties(ReadableByteStreamController.prototype, {314  close: { enumerable: true },315  enqueue: { enumerable: true },316  error: { enumerable: true },317  byobRequest: { enumerable: true },318  desiredSize: { enumerable: true }319});320if (typeof Symbol.toStringTag === 'symbol') {321  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {322    value: 'ReadableByteStreamController',323    configurable: true324  });325}326// Abstract operations for the ReadableByteStreamController.327export function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {328  if (!typeIsObject(x)) {329    return false;330  }331  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {332    return false;333  }334  return true;335}336function IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {337  if (!typeIsObject(x)) {338    return false;339  }340  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {341    return false;342  }343  return true;344}345function ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {346  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);347  if (!shouldPull) {348    return;349  }350  if (controller._pulling) {351    controller._pullAgain = true;352    return;353  }354  assert(!controller._pullAgain);355  controller._pulling = true;356  // TODO: Test controller argument357  const pullPromise = controller._pullAlgorithm();358  uponPromise(359    pullPromise,360    () => {361      controller._pulling = false;362      if (controller._pullAgain) {363        controller._pullAgain = false;364        ReadableByteStreamControllerCallPullIfNeeded(controller);365      }366    },367    e => {368      ReadableByteStreamControllerError(controller, e);369    }370  );371}372function ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {373  ReadableByteStreamControllerInvalidateBYOBRequest(controller);374  controller._pendingPullIntos = new SimpleQueue();375}376function ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(stream: ReadableByteStream,377                                                                                         pullIntoDescriptor: PullIntoDescriptor<T>) {378  assert(stream._state !== 'errored');379  let done = false;380  if (stream._state === 'closed') {381    assert(pullIntoDescriptor.bytesFilled === 0);382    done = true;383  }384  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);385  if (pullIntoDescriptor.readerType === 'default') {386    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);387  } else {388    assert(pullIntoDescriptor.readerType === 'byob');389    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);390  }391}392function ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(pullIntoDescriptor: PullIntoDescriptor<T>): T {393  const bytesFilled = pullIntoDescriptor.bytesFilled;394  const elementSize = pullIntoDescriptor.elementSize;395  assert(bytesFilled <= pullIntoDescriptor.byteLength);396  assert(bytesFilled % elementSize === 0);397  return new pullIntoDescriptor.viewConstructor(398    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;399}400function ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,401                                                         buffer: ArrayBufferLike,402                                                         byteOffset: number,403                                                         byteLength: number) {404  controller._queue.push({ buffer, byteOffset, byteLength });405  controller._queueTotalSize += byteLength;406}407function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,408                                                                     pullIntoDescriptor: PullIntoDescriptor) {409  const elementSize = pullIntoDescriptor.elementSize;410  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;411  const maxBytesToCopy = Math.min(controller._queueTotalSize,412                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);413  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;414  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;415  let totalBytesToCopyRemaining = maxBytesToCopy;416  let ready = false;417  if (maxAlignedBytes > currentAlignedBytes) {418    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;419    ready = true;420  }421  const queue = controller._queue;422  while (totalBytesToCopyRemaining > 0) {423    const headOfQueue = queue.peek();424    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);425    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;426    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);427    if (headOfQueue.byteLength === bytesToCopy) {428      queue.shift();429    } else {430      headOfQueue.byteOffset += bytesToCopy;431      headOfQueue.byteLength -= bytesToCopy;432    }433    controller._queueTotalSize -= bytesToCopy;434    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);435    totalBytesToCopyRemaining -= bytesToCopy;436  }437  if (!ready) {438    assert(controller._queueTotalSize === 0);439    assert(pullIntoDescriptor.bytesFilled > 0);440    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);441  }442  return ready;443}444function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,445                                                                size: number,446                                                                pullIntoDescriptor: PullIntoDescriptor) {447  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);448  ReadableByteStreamControllerInvalidateBYOBRequest(controller);449  pullIntoDescriptor.bytesFilled += size;450}451function ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {452  assert(controller._controlledReadableByteStream._state === 'readable');453  if (controller._queueTotalSize === 0 && controller._closeRequested) {454    ReadableByteStreamControllerClearAlgorithms(controller);455    ReadableStreamClose(controller._controlledReadableByteStream);456  } else {457    ReadableByteStreamControllerCallPullIfNeeded(controller);458  }459}460function ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {461  if (controller._byobRequest === null) {462    return;463  }464  controller._byobRequest._associatedReadableByteStreamController = undefined!;465  controller._byobRequest._view = null!;466  controller._byobRequest = null;467}468function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {469  assert(!controller._closeRequested);470  while (controller._pendingPullIntos.length > 0) {471    if (controller._queueTotalSize === 0) {472      return;473    }474    const pullIntoDescriptor = controller._pendingPullIntos.peek();475    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {476      ReadableByteStreamControllerShiftPendingPullInto(controller);477      ReadableByteStreamControllerCommitPullIntoDescriptor(478        controller._controlledReadableByteStream,479        pullIntoDescriptor480      );481    }482  }483}484export function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(485  controller: ReadableByteStreamController,486  view: T,487  readIntoRequest: ReadIntoRequest<T>488): void {489  const stream = controller._controlledReadableByteStream;490  let elementSize = 1;491  if (view.constructor !== DataView) {492    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;493  }494  const ctor = view.constructor as ArrayBufferViewConstructor<T>;495  const buffer = TransferArrayBuffer(view.buffer);496  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {497    buffer,498    byteOffset: view.byteOffset,499    byteLength: view.byteLength,500    bytesFilled: 0,501    elementSize,502    viewConstructor: ctor,503    readerType: 'byob'504  };505  if (controller._pendingPullIntos.length > 0) {506    controller._pendingPullIntos.push(pullIntoDescriptor);507    // No ReadableByteStreamControllerCallPullIfNeeded() call since:508    // - No change happens on desiredSize509    // - The source has already been notified of that there's at least 1 pending read(view)510    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);511    return;512  }513  if (stream._state === 'closed') {514    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);515    readIntoRequest._closeSteps(emptyView);516    return;517  }518  if (controller._queueTotalSize > 0) {519    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {520      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);521      ReadableByteStreamControllerHandleQueueDrain(controller);522      readIntoRequest._chunkSteps(filledView);523      return;524    }525    if (controller._closeRequested) {526      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');527      ReadableByteStreamControllerError(controller, e);528      readIntoRequest._errorSteps(e);529      return;530    }531  }532  controller._pendingPullIntos.push(pullIntoDescriptor);533  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);534  ReadableByteStreamControllerCallPullIfNeeded(controller);535}536function ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,537                                                          firstDescriptor: PullIntoDescriptor) {538  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);539  assert(firstDescriptor.bytesFilled === 0);540  const stream = controller._controlledReadableByteStream;541  if (ReadableStreamHasBYOBReader(stream)) {542    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {543      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);544      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);545    }546  }547}548function ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,549                                                            bytesWritten: number,550                                                            pullIntoDescriptor: PullIntoDescriptor) {551  if (pullIntoDescriptor.bytesFilled + bytesWritten > pullIntoDescriptor.byteLength) {552    throw new RangeError('bytesWritten out of range');553  }554  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);555  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {556    // TODO: Figure out whether we should detach the buffer or not here.557    return;558  }559  ReadableByteStreamControllerShiftPendingPullInto(controller);560  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;561  if (remainderSize > 0) {562    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;563    const remainder = pullIntoDescriptor.buffer.slice(end - remainderSize, end);564    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);565  }566  pullIntoDescriptor.buffer = TransferArrayBuffer(pullIntoDescriptor.buffer);567  pullIntoDescriptor.bytesFilled -= remainderSize;568  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);569  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);570}571function ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {572  const firstDescriptor = controller._pendingPullIntos.peek();573  const stream = controller._controlledReadableByteStream;574  if (stream._state === 'closed') {575    if (bytesWritten !== 0) {576      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');577    }578    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);579  } else {580    assert(stream._state === 'readable');581    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);582  }583  ReadableByteStreamControllerCallPullIfNeeded(controller);584}585function ReadableByteStreamControllerShiftPendingPullInto(controller: ReadableByteStreamController): PullIntoDescriptor {586  const descriptor = controller._pendingPullIntos.shift()!;587  ReadableByteStreamControllerInvalidateBYOBRequest(controller);588  return descriptor;589}590function ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {591  const stream = controller._controlledReadableByteStream;592  if (stream._state !== 'readable') {593    return false;594  }595  if (controller._closeRequested) {596    return false;597  }598  if (!controller._started) {599    return false;600  }601  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {602    return true;603  }604  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {605    return true;606  }607  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);608  assert(desiredSize !== null);609  if (desiredSize! > 0) {610    return true;611  }612  return false;613}614function ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {615  controller._pullAlgorithm = undefined!;616  controller._cancelAlgorithm = undefined!;617}618// A client of ReadableByteStreamController may use these functions directly to bypass state check.619function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {620  const stream = controller._controlledReadableByteStream;621  if (controller._closeRequested || stream._state !== 'readable') {622    return;623  }624  if (controller._queueTotalSize > 0) {625    controller._closeRequested = true;626    return;627  }628  if (controller._pendingPullIntos.length > 0) {629    const firstPendingPullInto = controller._pendingPullIntos.peek();630    if (firstPendingPullInto.bytesFilled > 0) {631      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');632      ReadableByteStreamControllerError(controller, e);633      throw e;634    }635  }636  ReadableByteStreamControllerClearAlgorithms(controller);637  ReadableStreamClose(stream);638}639function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {640  const stream = controller._controlledReadableByteStream;641  if (controller._closeRequested || stream._state !== 'readable') {642    return;643  }644  const buffer = chunk.buffer;645  const byteOffset = chunk.byteOffset;646  const byteLength = chunk.byteLength;647  const transferredBuffer = TransferArrayBuffer(buffer);648  if (ReadableStreamHasDefaultReader(stream)) {649    if (ReadableStreamGetNumReadRequests(stream) === 0) {650      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);651    } else {652      assert(controller._queue.length === 0);653      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);654      ReadableStreamFulfillReadRequest(stream, transferredView, false);655    }656  } else if (ReadableStreamHasBYOBReader(stream)) {657    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.658    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);659    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);660  } else {661    assert(!IsReadableStreamLocked(stream));662    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);663  }664  ReadableByteStreamControllerCallPullIfNeeded(controller);665}666function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {667  const stream = controller._controlledReadableByteStream;668  if (stream._state !== 'readable') {669    return;670  }671  ReadableByteStreamControllerClearPendingPullIntos(controller);672  ResetQueue(controller);673  ReadableByteStreamControllerClearAlgorithms(controller);674  ReadableStreamError(stream, e);675}676function ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {677  const stream = controller._controlledReadableByteStream;678  const state = stream._state;679  if (state === 'errored') {680    return null;681  }682  if (state === 'closed') {683    return 0;684  }685  return controller._strategyHWM - controller._queueTotalSize;686}687function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {688  bytesWritten = Number(bytesWritten);689  if (!IsFiniteNonNegativeNumber(bytesWritten)) {690    throw new RangeError('bytesWritten must be a finite');691  }692  assert(controller._pendingPullIntos.length > 0);693  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);694}695function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,696                                                        view: ArrayBufferView) {697  assert(controller._pendingPullIntos.length > 0);698  const firstDescriptor = controller._pendingPullIntos.peek();699  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {700    throw new RangeError('The region specified by view does not match byobRequest');701  }702  if (firstDescriptor.byteLength !== view.byteLength) {703    throw new RangeError('The buffer of view has different capacity than byobRequest');704  }705  firstDescriptor.buffer = view.buffer;706  ReadableByteStreamControllerRespondInternal(controller, view.byteLength);707}708export function SetUpReadableByteStreamController(stream: ReadableByteStream,709                                                  controller: ReadableByteStreamController,710                                                  startAlgorithm: () => void | PromiseLike<void>,711                                                  pullAlgorithm: () => Promise<void>,712                                                  cancelAlgorithm: (reason: any) => Promise<void>,713                                                  highWaterMark: number,714                                                  autoAllocateChunkSize: number | undefined) {715  assert(stream._readableStreamController === undefined);716  if (autoAllocateChunkSize !== undefined) {717    assert(NumberIsInteger(autoAllocateChunkSize));718    assert(autoAllocateChunkSize > 0);719  }720  controller._controlledReadableByteStream = stream;721  controller._pullAgain = false;722  controller._pulling = false;723  controller._byobRequest = null;724  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.725  controller._queue = controller._queueTotalSize = undefined!;726  ResetQueue(controller);727  controller._closeRequested = false;728  controller._started = false;729  controller._strategyHWM = highWaterMark;730  controller._pullAlgorithm = pullAlgorithm;731  controller._cancelAlgorithm = cancelAlgorithm;732  controller._autoAllocateChunkSize = autoAllocateChunkSize;733  controller._pendingPullIntos = new SimpleQueue();734  stream._readableStreamController = controller;735  const startResult = startAlgorithm();736  uponPromise(737    promiseResolvedWith(startResult),738    () => {739      controller._started = true;740      assert(!controller._pulling);741      assert(!controller._pullAgain);742      ReadableByteStreamControllerCallPullIfNeeded(controller);743    },744    r => {745      ReadableByteStreamControllerError(controller, r);746    }747  );748}749export function SetUpReadableByteStreamControllerFromUnderlyingSource(750  stream: ReadableByteStream,751  underlyingByteSource: ValidatedUnderlyingByteSource,752  highWaterMark: number753) {754  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);755  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;756  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);757  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);758  if (underlyingByteSource.start !== undefined) {759    startAlgorithm = () => underlyingByteSource.start!(controller);760  }761  if (underlyingByteSource.pull !== undefined) {762    pullAlgorithm = () => underlyingByteSource.pull!(controller);763  }764  if (underlyingByteSource.cancel !== undefined) {765    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);766  }767  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;768  SetUpReadableByteStreamController(769    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize770  );771}772function SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,773                                        controller: ReadableByteStreamController,774                                        view: ArrayBufferView) {775  assert(IsReadableByteStreamController(controller));776  assert(typeof view === 'object');777  assert(ArrayBuffer.isView(view));778  assert(!IsDetachedBuffer(view.buffer));779  request._associatedReadableByteStreamController = controller;780  request._view = view;781}782// Helper functions for the ReadableStreamBYOBRequest.783function byobRequestBrandCheckException(name: string): TypeError {784  return new TypeError(785    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);786}787// Helper functions for the ReadableByteStreamController.788function byteStreamControllerBrandCheckException(name: string): TypeError {789  return new TypeError(790    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);...

Using AI Code Generation

1wptb.byobRequestBrandCheckException();2wptb.byobRequestBrandCheckException();3wptb.byobRequestBrandCheckException();4wptb.byobRequestBrandCheckException();5wptb.byobRequestBrandCheckException();6wptb.byobRequestBrandCheckException();7wptb.byobRequestBrandCheckException();8wptb.byobRequestBrandCheckException();9wptb.byobRequestBrandCheckException();10wptb.byobRequestBrandCheckException();11wptb.byobRequestBrandCheckException();12wptb.byobRequestBrandCheckException();13wptb.byobRequestBrandCheckException();14wptb.byobRequestBrandCheckException();15wptb.byobRequestBrandCheckException();16wptb.byobRequestBrandCheckException();17wptb.byobRequestBrandCheckException();18wptb.byobRequestBrandCheckException();

Using AI Code Generation

1var wpt = new Worker('worker.js');2wpt.onmessage = function(e) {3    postMessage(e.data);4}5wpt.postMessage({type: 'byobRequestBrandCheckException'});6self.onmessage = function(e) {7    if (e.data.type == 'byobRequestBrandCheckException') {8        var ab = new ArrayBuffer(1);9        var u8a = new Uint8Array(ab);10        var byobRequest = new ReadableStream().getReader({mode: 'byob'}).read(u8a);11        try {12            byobRequest.constructor.prototype.constructor = 1;13        } catch (e) {14            postMessage("pass");15        }16    }17}

Using AI Code Generation

1var byobRequestBrandCheckException = function() {2  var r = new ReadableStream({3    pull(controller) {4      return controller.byobRequest;5    }6  });7  var reader = r.getReader({mode: "byob"});8  reader.read(new Uint8Array(1));9}10byobRequestBrandCheckException();

Using AI Code Generation

1function testBrandCheckException() {2  var request = new BYOBRequest();3  var view = new Uint8Array(8);4  request.view = view;5  request.byobRequestBrandCheckException();6}7  testBrandCheckException();

Using AI Code Generation

1var wpt = new WebPageTest('www.webpagetest.org');2wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {3  if (err) return console.log(err);4  console.log(data);5});6var wpt = new WebPageTest('www.webpagetest.org');7wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {8  if (err) return console.log(err);9  console.log(data);10});11var wpt = new WebPageTest('www.webpagetest.org');12wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {13  if (err) return console.log(err);14  console.log(data);15});16var wpt = new WebPageTest('www.webpagetest.org');17wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {18  if (err) return console.log(err);19  console.log(data);20});21var wpt = new WebPageTest('www.webpagetest.org');22wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {23  if (err) return console.log(err);24  console.log(data);25});26var wpt = new WebPageTest('www.webpagetest.org');27wpt.byobRequestBrandCheckException('www.webpagetest.org', 'TestBrandCheckException', function(err, data) {28  if (err) return console.log(err);29  console.log(data);30});31var wpt = new WebPageTest('www.webpagetest.org');32wpt.byobRequestBrandCheckException('

Using AI Code Generation

1var brandCheck = new XMLHttpRequest();2brandCheck.send();3brandCheck.onreadystatechange = function() {4    if (brandCheck.readyState == 4 && brandCheck.status == 200) {5        var brand = brandCheck.responseText;6        var brandCheck2 = new XMLHttpRequest();7        brandCheck2.send();8        brandCheck2.onreadystatechange = function() {9            if (brandCheck2.readyState == 4 && brandCheck2.status == 200) {10                var brand2 = brandCheck2.responseText;11                if (brand != brand2) {12                    document.getElementById("result").innerHTML = "PASS";13                }14            }15        }16    }17}18import os19import sys20import urlparse21import wptserve22def main(request, response):23    url_parts = urlparse.urlparse(request.url)24    query = urlparse.parse_qs(url_parts.query)25    brand = query.get("brand")[0]26    request.server.stash.take("brand")27    request.server.stash.put("brand", brand)28    response.headers.set("Content-Type", "text/html")29import os30import sys31import urlparse32import wptserve33def main(request, response):34    url_parts = urlparse.urlparse(request.url)35    query = urlparse.parse_qs(url_parts.query)36    brand = query.get("brand")[0]37    request.server.stash.take("brand")38    request.server.stash.put("brand", brand)39    response.headers.set("Content-Type", "text/html")40import os41import sys42import urlparse43import wptserve44def main(request, response):45    url_parts = urlparse.urlparse(request.url)46    query = urlparse.parse_qs(url_parts.query)47    brand = query.get("brand")[0]48    request.server.stash.take("brand")49    request.server.stash.put("brand", brand)50    response.headers.set("Content-Type", "text/html")51import os52import sys53import urlparse54import wptserve55def main(request, response):

Using AI Code Generation

1var byobRequest = new Uint8Array(1).buffer;2var writer = new WritableStream().getWriter({type: 'byob'});3writer.write(byobRequest).then(function() {4  test(function() {5    assert_unreached('write() should reject');6  }, 'write() should reject');7}, function(error) {8  test(function() {9    assert_equals(error.name, 'TypeError', 'error should be a TypeError');10  }, 'error should be a TypeError');11});12var byobRequest = new Uint8Array(1).buffer;13var writer = new WritableStream().getWriter({type: 'byob'});14writer.write(byobRequest).then(function() {15  test(function() {16    assert_unreached('write() should reject');17  }, 'write() should reject');18}, function(error) {19  test(function() {20    assert_equals(error.name, 'TypeError', 'error should be a TypeError');21  }, 'error should be a TypeError');22});23var byobRequest = new Uint8Array(1).buffer;24var writer = new WritableStream().getWriter({type: 'byob'});25writer.write(byobRequest).then(function() {26  test(function() {27    assert_unreached('write() should reject');28  }, 'write() should reject');29}, function(error) {30  test(function() {31    assert_equals(error.name, 'TypeError', 'error should be a TypeError');32  }, 'error should be a TypeError');33});34var byobRequest = new Uint8Array(1).buffer;35var writer = new WritableStream().getWriter({type: 'byob'});36writer.write(byobRequest).then(function() {37  test(function

Using AI Code Generation

1var wpt = new Worker("worker.js");2wpt.postMessage({type:"brandCheckException"});3wpt.onmessage = function(event) {4    var result = event.data;5    if (result === "pass")6        postMessage("pass");7        postMessage("fail");8}9var brandCheckException = function() {10    var ab = new ArrayBuffer(16);11    var dv = new DataView(ab);12    dv.setUint8(0, 1);13}14var wpt;15onmessage = function(event) {16    var data = event.data;17    if (data.type === "brandCheckException") {18        wpt = new Worker("worker.js");19        wpt.postMessage({type:"brandCheckException"});20        wpt.onmessage = function(event) {21            var result = event.data;22            if (result === "pass")23                postMessage("pass");24                postMessage("fail");25        }26    } else if (data.type === "brandCheckException") {27        try {28            brandCheckException();29            postMessage("fail");30        } catch (e) {31            if (e instanceof TypeError)32                postMessage("pass");33                postMessage("fail");34        }35    }36}37 > +    var ab = new ArrayBuffer(16);38> +    var dv = new DataView(ab);39> +    dv.setUint8(0, 1);40> +}

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.