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const {
ArrayBufferPrototype,
ArrayBufferPrototypeSlice,
ArrayPrototypePush,
ArrayPrototypeShift,
AsyncIteratorPrototype,
FunctionPrototypeCall,
MathMax,
NumberIsNaN,
ObjectCreate,
PromisePrototypeThen,
PromiseResolve,
PromiseReject,
ReflectGet,
Symbol,
Uint8Array,
} = primordials;
const {
codes: {
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_OPERATION_FAILED,
},
} = require('internal/errors');
const {
copyArrayBuffer,
detachArrayBuffer
} = internalBinding('buffer');
const {
isPromise,
} = require('internal/util/types');
const {
inspect,
} = require('util');
const {
getPromiseDetails,
kPending,
} = internalBinding('util');
const assert = require('internal/assert');
const kState = Symbol('kState');
const kType = Symbol('kType');
const AsyncIterator = ObjectCreate(AsyncIteratorPrototype, {
next: {
__proto__: null,
configurable: true,
enumerable: true,
writable: true,
},
return: {
__proto__: null,
configurable: true,
enumerable: true,
writable: true,
},
});
function extractHighWaterMark(value, defaultHWM) {
if (value === undefined) return defaultHWM;
value = +value;
if (typeof value !== 'number' ||
NumberIsNaN(value) ||
value < 0)
throw new ERR_INVALID_ARG_VALUE.RangeError('strategy.highWaterMark', value);
return value;
}
function extractSizeAlgorithm(size) {
if (size === undefined) return () => 1;
if (typeof size !== 'function')
throw new ERR_INVALID_ARG_TYPE('strategy.size', 'Function', size);
return size;
}
function customInspect(depth, options, name, data) {
if (depth < 0)
return this;
const opts = {
...options,
depth: options.depth == null ? null : options.depth - 1
};
return `${name} ${inspect(data, opts)}`;
}
// These are defensive to work around the possibility that
// the buffer, byteLength, and byteOffset properties on
// ArrayBuffer and ArrayBufferView's may have been tampered with.
function ArrayBufferViewGetBuffer(view) {
return ReflectGet(view.constructor.prototype, 'buffer', view);
}
function ArrayBufferViewGetByteLength(view) {
return ReflectGet(view.constructor.prototype, 'byteLength', view);
}
function ArrayBufferViewGetByteOffset(view) {
return ReflectGet(view.constructor.prototype, 'byteOffset', view);
}
function ArrayBufferGetByteLength(view) {
return ReflectGet(ArrayBufferPrototype, 'byteLength', view);
}
function cloneAsUint8Array(view) {
const buffer = ArrayBufferViewGetBuffer(view);
const byteOffset = ArrayBufferViewGetByteOffset(view);
const byteLength = ArrayBufferViewGetByteLength(view);
return new Uint8Array(
ArrayBufferPrototypeSlice(buffer, byteOffset, byteOffset + byteLength)
);
}
function isBrandCheck(brand) {
return (value) => {
return value != null &&
value[kState] !== undefined &&
value[kType] === brand;
};
}
function transferArrayBuffer(buffer) {
const res = detachArrayBuffer(buffer);
if (res === undefined) {
throw new ERR_OPERATION_FAILED.TypeError(
'The ArrayBuffer could not be transferred');
}
return res;
}
function isDetachedBuffer(buffer) {
if (ArrayBufferGetByteLength(buffer) === 0) {
// TODO(daeyeon): Consider using C++ builtin to improve performance.
try {
new Uint8Array(buffer);
} catch (error) {
assert(error.name === 'TypeError');
return true;
}
}
return false;
}
function isViewedArrayBufferDetached(view) {
return (
ArrayBufferViewGetByteLength(view) === 0 &&
isDetachedBuffer(ArrayBufferViewGetBuffer(view))
);
}
function dequeueValue(controller) {
assert(controller[kState].queue !== undefined);
assert(controller[kState].queueTotalSize !== undefined);
assert(controller[kState].queue.length);
const {
value,
size,
} = ArrayPrototypeShift(controller[kState].queue);
controller[kState].queueTotalSize =
MathMax(0, controller[kState].queueTotalSize - size);
return value;
}
function resetQueue(controller) {
assert(controller[kState].queue !== undefined);
assert(controller[kState].queueTotalSize !== undefined);
controller[kState].queue = [];
controller[kState].queueTotalSize = 0;
}
function peekQueueValue(controller) {
assert(controller[kState].queue !== undefined);
assert(controller[kState].queueTotalSize !== undefined);
assert(controller[kState].queue.length);
return controller[kState].queue[0].value;
}
function enqueueValueWithSize(controller, value, size) {
assert(controller[kState].queue !== undefined);
assert(controller[kState].queueTotalSize !== undefined);
size = +size;
if (typeof size !== 'number' ||
size < 0 ||
NumberIsNaN(size) ||
size === Infinity) {
throw new ERR_INVALID_ARG_VALUE.RangeError('size', size);
}
ArrayPrototypePush(controller[kState].queue, { value, size });
controller[kState].queueTotalSize += size;
}
function ensureIsPromise(fn, thisArg, ...args) {
try {
const value = FunctionPrototypeCall(fn, thisArg, ...args);
return isPromise(value) ? value : PromiseResolve(value);
} catch (error) {
return PromiseReject(error);
}
}
function isPromisePending(promise) {
if (promise === undefined) return false;
const details = getPromiseDetails(promise);
return details?.[0] === kPending;
}
function setPromiseHandled(promise) {
// Alternatively, we could use the native API
// MarkAsHandled, but this avoids the extra boundary cross
// and is hopefully faster at the cost of an extra Promise
// allocation.
PromisePrototypeThen(promise, () => {}, () => {});
}
async function nonOpFlush() {}
function nonOpStart() {}
async function nonOpPull() {}
async function nonOpCancel() {}
async function nonOpWrite() {}
let transfer;
function lazyTransfer() {
if (transfer === undefined)
transfer = require('internal/webstreams/transfer');
return transfer;
}
module.exports = {
ArrayBufferViewGetBuffer,
ArrayBufferViewGetByteLength,
ArrayBufferViewGetByteOffset,
ArrayBufferGetByteLength,
AsyncIterator,
cloneAsUint8Array,
copyArrayBuffer,
customInspect,
dequeueValue,
ensureIsPromise,
enqueueValueWithSize,
extractHighWaterMark,
extractSizeAlgorithm,
lazyTransfer,
isBrandCheck,
isDetachedBuffer,
isPromisePending,
isViewedArrayBufferDetached,
peekQueueValue,
resetQueue,
setPromiseHandled,
transferArrayBuffer,
nonOpCancel,
nonOpFlush,
nonOpPull,
nonOpStart,
nonOpWrite,
kType,
kState,
};
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