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45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
// Loaded from https://deno.land/std@0.89.0/io/writers.ts
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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type Writer = Deno.Writer;
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type WriterSync = Deno.WriterSync;
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/** Writer utility for buffering string chunks */
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export class StringWriter implements Writer, WriterSync {
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private chunks: Uint8Array[] = [];
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private byteLength = 0;
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private cache: string | undefined;
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constructor(private base: string = "") {
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const c = new TextEncoder().encode(base);
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this.chunks.push(c);
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this.byteLength += c.byteLength;
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}
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write(p: Uint8Array): Promise<number> {
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return Promise.resolve(this.writeSync(p));
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}
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writeSync(p: Uint8Array): number {
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this.chunks.push(p);
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this.byteLength += p.byteLength;
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this.cache = undefined;
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return p.byteLength;
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}
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toString(): string {
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if (this.cache) {
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return this.cache;
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}
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const buf = new Uint8Array(this.byteLength);
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let offs = 0;
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for (const chunk of this.chunks) {
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buf.set(chunk, offs);
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offs += chunk.byteLength;
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}
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this.cache = new TextDecoder().decode(buf);
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return this.cache;
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}
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}
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