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Macide Celik 2019-10-29 08:05:13 +03:00 committed by GitHub
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src/core/operations/Diff.mjs
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/**
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
import * as JsDiff from "diff";
import OperationError from "../errors/OperationError.mjs";
/**
* Diff operation
*/
class Diff extends Operation {
/**
* Diff constructor
*/
constructor() {
super();
this.name = "Diff";
this.module = "Diff";
this.description = "Compares two inputs (separated by the specified delimiter) and highlights the differences between them.";
this.infoURL = "https://wikipedia.org/wiki/File_comparison";
this.inputType = "string";
this.outputType = "html";
this.args = [
{
"name": "Sample delimiter",
"type": "binaryString",
"value": "\\n\\n"
},
{
"name": "Diff by",
"type": "option",
"value": ["Character", "Word", "Line", "Sentence", "CSS", "JSON"]
},
{
"name": "Show added",
"type": "boolean",
"value": true
},
{
"name": "Show removed",
"type": "boolean",
"value": true
},
{
"name": "Ignore whitespace",
"type": "boolean",
"value": false,
"hint": "Relevant for word and line"
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {html}
*/
run(input, args) {
const [
sampleDelim,
diffBy,
showAdded,
showRemoved,
ignoreWhitespace
] = args,
samples = input.split(sampleDelim);
let output = "",
diff;
// Node and Webpack load modules slightly differently
const jsdiff = JsDiff.default ? JsDiff.default : JsDiff;
if (!samples || samples.length !== 2) {
throw new OperationError("Incorrect number of samples, perhaps you need to modify the sample delimiter or add more samples?");
}
switch (diffBy) {
case "Character":
diff = jsdiff.diffChars(samples[0], samples[1]);
break;
case "Word":
if (ignoreWhitespace) {
diff = jsdiff.diffWords(samples[0], samples[1]);
} else {
diff = jsdiff.diffWordsWithSpace(samples[0], samples[1]);
}
break;
case "Line":
if (ignoreWhitespace) {
diff = jsdiff.diffTrimmedLines(samples[0], samples[1]);
} else {
diff = jsdiff.diffLines(samples[0], samples[1]);
}
break;
case "Sentence":
diff = jsdiff.diffSentences(samples[0], samples[1]);
break;
case "CSS":
diff = jsdiff.diffCss(samples[0], samples[1]);
break;
case "JSON":
diff = jsdiff.diffJson(samples[0], samples[1]);
break;
default:
throw new OperationError("Invalid 'Diff by' option.");
}
for (let i = 0; i < diff.length; i++) {
if (diff[i].added) {
if (showAdded) output += "<span class='hl5'>" + Utils.escapeHtml(diff[i].value) + "</span>";
} else if (diff[i].removed) {
if (showRemoved) output += "<span class='hl3'>" + Utils.escapeHtml(diff[i].value) + "</span>";
} else {
output += Utils.escapeHtml(diff[i].value);
}
}
return output;
}
}
export default Diff;