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std/io/readers.ts

Deno standard library
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The Standard Library has been moved to JSR. See the blog post for details.
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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; }}