mirror of https://github.com/gchq/CyberChef.git
129 lines
3.8 KiB
JavaScript
129 lines
3.8 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";
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import Utils from "../Utils";
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import * as JsDiff from "diff";
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import OperationError from "../errors/OperationError";
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/**
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* Diff operation
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*/
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class Diff extends Operation {
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/**
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* Diff constructor
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*/
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constructor() {
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super();
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this.name = "Diff";
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this.module = "Diff";
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this.description = "Compares two inputs (separated by the specified delimiter) and highlights the differences between them.";
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this.inputType = "string";
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this.outputType = "html";
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this.args = [
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{
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"name": "Sample delimiter",
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"type": "binaryString",
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"value": "\\n\\n"
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},
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{
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"name": "Diff by",
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"type": "option",
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"value": ["Character", "Word", "Line", "Sentence", "CSS", "JSON"]
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},
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{
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"name": "Show added",
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"type": "boolean",
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"value": true
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},
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{
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"name": "Show removed",
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"type": "boolean",
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"value": true
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},
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{
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"name": "Ignore whitespace",
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"type": "boolean",
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"value": false,
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"hint": "Relevant for word and line"
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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 {html}
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*/
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run(input, args) {
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const [
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sampleDelim,
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diffBy,
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showAdded,
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showRemoved,
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ignoreWhitespace
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] = args,
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samples = input.split(sampleDelim);
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let output = "",
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diff;
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// Node and Webpack load modules slightly differently
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const jsdiff = JsDiff.default ? JsDiff.default : JsDiff;
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if (!samples || samples.length !== 2) {
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throw new OperationError("Incorrect number of samples, perhaps you need to modify the sample delimiter or add more samples?");
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}
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switch (diffBy) {
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case "Character":
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diff = jsdiff.diffChars(samples[0], samples[1]);
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break;
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case "Word":
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if (ignoreWhitespace) {
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diff = jsdiff.diffWords(samples[0], samples[1]);
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} else {
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diff = jsdiff.diffWordsWithSpace(samples[0], samples[1]);
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}
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break;
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case "Line":
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if (ignoreWhitespace) {
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diff = jsdiff.diffTrimmedLines(samples[0], samples[1]);
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} else {
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diff = jsdiff.diffLines(samples[0], samples[1]);
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}
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break;
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case "Sentence":
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diff = jsdiff.diffSentences(samples[0], samples[1]);
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break;
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case "CSS":
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diff = jsdiff.diffCss(samples[0], samples[1]);
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break;
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case "JSON":
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diff = jsdiff.diffJson(samples[0], samples[1]);
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break;
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default:
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throw new OperationError("Invalid 'Diff by' option.");
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}
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for (let i = 0; i < diff.length; i++) {
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if (diff[i].added) {
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if (showAdded) output += "<span class='hl5'>" + Utils.escapeHtml(diff[i].value) + "</span>";
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} else if (diff[i].removed) {
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if (showRemoved) output += "<span class='hl3'>" + Utils.escapeHtml(diff[i].value) + "</span>";
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} else {
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output += Utils.escapeHtml(diff[i].value);
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}
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}
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return output;
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}
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}
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export default Diff;
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