deno.land / std@0.166.0 / io / writers.ts

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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
import type { Writer, WriterSync } from "./types.d.ts";
const decoder = new TextDecoder();
/** Writer utility for buffering string chunks */export class StringWriter implements Writer, WriterSync { #chunks: Uint8Array[] = []; #byteLength = 0; #cache: string | undefined;
constructor(private base: string = "") { const c = new TextEncoder().encode(base); this.#chunks.push(c); this.#byteLength += c.byteLength; }
write(p: Uint8Array): Promise<number> { return Promise.resolve(this.writeSync(p)); }
writeSync(p: Uint8Array): number { this.#chunks.push(new Uint8Array(p)); this.#byteLength += p.byteLength; this.#cache = undefined; return p.byteLength; }
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 = decoder.decode(buf); return this.#cache; }}
std
Deno standard library
GitHub Repositorydenoland/deno_std
GitHub Stars
2448

Version Info

Tagged at
2 months ago