// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license. type Writer = Deno.Writer; import { decode, encode } from "../strings/strings.ts"; /** Writer utility for buffering string chunks */ export class StringWriter implements Writer { private chunks: Uint8Array[] = []; private byteLength: number = 0; constructor(private base: string = "") { const c = encode(base); this.chunks.push(c); this.byteLength += c.byteLength; } async write(p: Uint8Array): Promise<number> { this.chunks.push(p); this.byteLength += p.byteLength; this.cache = null; return p.byteLength; } private cache: string; toString(): string { if (this.cache) { return this.cache; } const buf = new Uint8Array(this.byteLength); let offs = 0; for (const chunk of this.chunks) { buf.set(chunk, offs); offs += chunk.byteLength; } this.cache = decode(buf); return this.cache; } }