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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import * as sym from "./symbols.ts";
import {
isReadableStreamAsyncIterator,
ReadableStreamAsyncIterator,
readableStreamCreateReadResult,
readableStreamReaderGenericCancel,
readableStreamReaderGenericRelease,
readableStreamDefaultReaderRead,
} from "./internals.ts";
import { assert } from "../../util.ts";
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const AsyncIteratorPrototype: AsyncIterableIterator<any> = Object
.getPrototypeOf(Object.getPrototypeOf(async function* () {}).prototype);
export const ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIterator =
Object.setPrototypeOf({
next(
this: ReadableStreamAsyncIterator,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
): Promise<ReadableStreamReadResult<any>> {
if (!isReadableStreamAsyncIterator(this)) {
return Promise.reject(
new TypeError("invalid ReadableStreamAsyncIterator."),
);
}
const reader = this[sym.asyncIteratorReader];
if (!reader[sym.ownerReadableStream]) {
return Promise.reject(
new TypeError("reader owner ReadableStream is undefined."),
);
}
return readableStreamDefaultReaderRead(reader).then((result) => {
assert(typeof result === "object");
const { done } = result;
assert(typeof done === "boolean");
if (done) {
readableStreamReaderGenericRelease(reader);
}
const { value } = result;
return readableStreamCreateReadResult(value, done, true);
});
},
return(
this: ReadableStreamAsyncIterator,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
value?: any | PromiseLike<any>,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
): Promise<ReadableStreamReadResult<any>> {
if (!isReadableStreamAsyncIterator(this)) {
return Promise.reject(
new TypeError("invalid ReadableStreamAsyncIterator."),
);
}
const reader = this[sym.asyncIteratorReader];
if (!reader[sym.ownerReadableStream]) {
return Promise.reject(
new TypeError("reader owner ReadableStream is undefined."),
);
}
if (reader[sym.readRequests].length) {
return Promise.reject(
new TypeError("reader has outstanding read requests."),
);
}
if (!this[sym.preventCancel]) {
const result = readableStreamReaderGenericCancel(reader, value);
readableStreamReaderGenericRelease(reader);
return result.then(() =>
readableStreamCreateReadResult(value, true, true)
);
}
readableStreamReaderGenericRelease(reader);
return Promise.resolve(
readableStreamCreateReadResult(value, true, true),
);
},
}, AsyncIteratorPrototype);
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