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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.type Reader = Deno.Reader;import { encode } from "../encoding/utf8.ts";
/** Reader utility for strings */export class StringReader implements Reader {  private offs = 0;  private buf = new Uint8Array(encode(this.s));
  constructor(private readonly s: string) {}
  read(p: Uint8Array): Promise<number | Deno.EOF> {    const n = Math.min(p.byteLength, this.buf.byteLength - this.offs);    p.set(this.buf.slice(this.offs, this.offs + n));    this.offs += n;    if (n === 0) {      return Promise.resolve(Deno.EOF);    }    return Promise.resolve(n);  }}
/** Reader utility for combining multiple readers */export class MultiReader implements Reader {  private readonly readers: Reader[];  private currentIndex = 0;
  constructor(...readers: Reader[]) {    this.readers = readers;  }
  async read(p: Uint8Array): Promise<number | Deno.EOF> {    const r = this.readers[this.currentIndex];    if (!r) return Deno.EOF;    const result = await r.read(p);    if (result === Deno.EOF) {      this.currentIndex++;      return 0;    }    return result;  }}