CyberChef/src/core/operations/SymmetricDifference.mjs

99 lines
2.4 KiB
JavaScript
Raw Normal View History

2018-04-09 12:13:23 +02:00
/**
* @author d98762625 [d98762625@gmail.com]
* @copyright Crown Copyright 2018
* @license Apache-2.0
*/
import Utils from "../Utils";
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
2018-04-09 12:13:23 +02:00
/**
* Set Symmetric Difference operation
*/
class SymmetricDifference extends Operation {
/**
* Symmetric Difference constructor
*/
constructor() {
super();
this.name = "Symmetric Difference";
this.module = "Default";
2018-04-11 19:29:02 +02:00
this.description = "Calculates the symmetric difference of two sets.";
2018-04-09 12:13:23 +02:00
this.inputType = "string";
this.outputType = "string";
this.args = [
{
name: "Sample delimiter",
type: "binaryString",
value: Utils.escapeHtml("\\n\\n")
},
{
name: "Item delimiter",
type: "binaryString",
value: ","
},
];
}
/**
* Validate input length
2018-04-11 19:29:02 +02:00
*
2018-04-09 12:13:23 +02:00
* @param {Object[]} sets
* @throws {Error} if not two sets
*/
validateSampleNumbers(sets) {
if (!sets || (sets.length !== 2)) {
throw new OperationError("Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?");
2018-04-09 12:13:23 +02:00
}
}
/**
* Run the difference operation
2018-04-11 19:29:02 +02:00
*
* @param {string} input
* @param {Object[]} args
* @returns {string}
* @throws {OperationError}
2018-04-09 12:13:23 +02:00
*/
run(input, args) {
[this.sampleDelim, this.itemDelimiter] = args;
const sets = input.split(this.sampleDelim);
this.validateSampleNumbers(sets);
2018-04-09 12:13:23 +02:00
2018-04-11 19:29:02 +02:00
return this.runSymmetricDifference(...sets.map(s => s.split(this.itemDelimiter)));
2018-04-09 12:13:23 +02:00
}
/**
* Get elements in set a that are not in set b
*
* @param {Object[]} a
* @param {Object[]} b
* @returns {Object[]}
*/
runSetDifference(a, b) {
return a.filter((item) => {
return b.indexOf(item) === -1;
});
}
/**
* Get elements of each set that aren't in the other set.
*
* @param {Object[]} a
* @param {Object[]} b
* @return {Object[]}
*/
runSymmetricDifference(a, b) {
return this.runSetDifference(a, b)
.concat(this.runSetDifference(b, a))
.join(this.itemDelimiter);
}
}
export default SymmetricDifference;