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41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.DelimiterParser = void 0;
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const stream_1 = require("stream");
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/**
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* A transform stream that emits data each time a byte sequence is received.
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* @extends Transform
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*
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* To use the `Delimiter` parser, provide a delimiter as a string, buffer, or array of bytes. Runs in O(n) time.
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*/
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class DelimiterParser extends stream_1.Transform {
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constructor({ delimiter, includeDelimiter = false, ...options }) {
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super(options);
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if (delimiter === undefined) {
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throw new TypeError('"delimiter" is not a bufferable object');
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}
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if (delimiter.length === 0) {
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throw new TypeError('"delimiter" has a 0 or undefined length');
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}
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this.includeDelimiter = includeDelimiter;
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this.delimiter = Buffer.from(delimiter);
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this.buffer = Buffer.alloc(0);
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}
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_transform(chunk, encoding, cb) {
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let data = Buffer.concat([this.buffer, chunk]);
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let position;
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while ((position = data.indexOf(this.delimiter)) !== -1) {
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this.push(data.slice(0, position + (this.includeDelimiter ? this.delimiter.length : 0)));
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data = data.slice(position + this.delimiter.length);
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}
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this.buffer = data;
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cb();
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}
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_flush(cb) {
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this.push(this.buffer);
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this.buffer = Buffer.alloc(0);
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cb();
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}
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}
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exports.DelimiterParser = DelimiterParser;
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