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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import { Buffer } from "../io/buffer.ts";import { writeAll } from "../io/write_all.ts";import type { Reader } from "../io/types.ts";
/** * Create a {@linkcode Reader} from an iterable of {@linkcode Uint8Array}s. * * ```ts * import { readerFromIterable } from "https://deno.land/std@$STD_VERSION/streams/reader_from_iterable.ts"; * import { copy } from "https://deno.land/std@$STD_VERSION/io/copy.ts"; * * const file = await Deno.open("build.txt", { write: true }); * const reader = readerFromIterable((async function* () { *   while (true) { *     await new Promise((r) => setTimeout(r, 1000)); *     const message = `data: ${JSON.stringify(Deno.build)}\n\n`; *     yield new TextEncoder().encode(message); *   } * })()); * await copy(reader, file); * ``` * * @deprecated (will be removed after 1.0.0) Use {@linkcode ReadableStream.from} instead. */export function readerFromIterable(  iterable: Iterable<Uint8Array> | AsyncIterable<Uint8Array>,): Reader {  const iterator: Iterator<Uint8Array> | AsyncIterator<Uint8Array> =    (iterable as AsyncIterable<Uint8Array>)[Symbol.asyncIterator]?.() ??      (iterable as Iterable<Uint8Array>)[Symbol.iterator]?.();  const buffer = new Buffer();  return {    async read(p: Uint8Array): Promise<number | null> {      if (buffer.length === 0) {        const result = await iterator.next();        if (result.done) {          return null;        } else {          if (result.value.byteLength <= p.byteLength) {            p.set(result.value);            return result.value.byteLength;          }          p.set(result.value.subarray(0, p.byteLength));          await writeAll(buffer, result.value.subarray(p.byteLength));          return p.byteLength;        }      } else {        const n = await buffer.read(p);        if (n === null) {          return this.read(p);        }        return n;      }    },  };}