mirror of https://github.com/gchq/CyberChef.git
71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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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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import {INPUT_DELIM_OPTIONS} from "../lib/Delim.mjs";
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/**
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* Tail operation
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*/
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class Tail extends Operation {
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/**
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* Tail constructor
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*/
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constructor() {
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super();
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this.name = "Tail";
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this.module = "Default";
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this.description = "Like the UNIX tail utility.<br>Gets the last n lines.<br>Optionally you can select all lines after line n by entering a negative value for n.<br>The delimiter can be changed so that instead of lines, fields (i.e. commas) are selected instead.";
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this.infoURL = "https://wikipedia.org/wiki/Tail_(Unix)";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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"name": "Delimiter",
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"type": "option",
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"value": INPUT_DELIM_OPTIONS
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},
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{
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"name": "Number",
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"type": "number",
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"value": 10
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}
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];
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}
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/**
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* @param {string} 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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let delimiter = args[0];
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const number = args[1];
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delimiter = Utils.charRep(delimiter);
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const splitInput = input.split(delimiter);
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return splitInput
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.filter((line, lineIndex) => {
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lineIndex += 1;
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if (number < 0) {
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return lineIndex > -number;
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} else {
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return lineIndex > splitInput.length - number;
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}
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})
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.join(delimiter);
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}
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}
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export default Tail;
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