80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
/**
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* @author ThomasNotTom
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* @copyright Crown Copyright 2025
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import Utils from "../Utils.mjs";
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/**
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* Line Break operation
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*/
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class LineBreak extends Operation {
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/**
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* LineBreak constructor
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*/
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constructor() {
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super();
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this.name = "Line Break";
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this.module = "Default";
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this.description = "Breaks the input text every <code>n</code> characters.";
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this.inputType = "ArrayBuffer";
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this.outputType = "string";
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this.args = [
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{
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"name": "Line break width",
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"type": "number",
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"value": 16,
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"min": 1
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}, {
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"name": "Remove leading whitespace",
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"type": "boolean",
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"value": false
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}
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];
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}
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/**
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* @param {ArrayBuffer} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const lines = [];
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const lineWidth = args[0];
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const removeLeading = args[1];
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const msg = Utils.arrayBufferToStr(input, false);
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let i = 0;
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while (i < msg.length) {
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let slice = msg.slice(i, i + lineWidth);
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let leadingWhitespace = 0;
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if (removeLeading) {
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const match = slice.match(/^\s*/);
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leadingWhitespace = match ? match[0].length : 0;
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slice = slice.trimStart();
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}
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slice = msg.slice(i, i + lineWidth + leadingWhitespace);
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if (removeLeading) {
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slice = slice.trimStart();
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}
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i += lineWidth + leadingWhitespace;
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if (slice.length === 0) continue;
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lines.push(slice);
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}
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return lines.join("\n");
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}
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}
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export default LineBreak;
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