mirror of https://github.com/gchq/CyberChef.git
98 lines
2.6 KiB
JavaScript
98 lines
2.6 KiB
JavaScript
/**
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* @author d98762625 [d98762625@gmail.com]
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* @copyright Crown Copyright 2018
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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 OperationError from "../errors/OperationError";
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/**
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* Set cartesian product operation
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*/
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class CartesianProduct extends Operation {
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/**
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* Cartesian Product constructor
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*/
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constructor() {
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super();
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this.name = "Cartesian Product";
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this.module = "Default";
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this.description = "Calculates the cartesian product of multiple sets of data, returning all possible combinations.";
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this.infoURL = "https://wikipedia.org/wiki/Cartesian_product";
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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: "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: "Item delimiter",
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type: "binaryString",
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value: ","
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},
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];
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}
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/**
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* Validate input length
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*
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* @param {Object[]} sets
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* @throws {OperationError} if fewer than 2 sets
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*/
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validateSampleNumbers(sets) {
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if (!sets || sets.length < 2) {
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throw new OperationError("Incorrect number of sets, perhaps you" +
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" need to modify the sample delimiter or add more samples?");
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}
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}
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/**
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* Run the product operation
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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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* @throws {OperationError}
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*/
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run(input, args) {
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[this.sampleDelim, this.itemDelimiter] = args;
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const sets = input.split(this.sampleDelim);
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this.validateSampleNumbers(sets);
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return this.runCartesianProduct(...sets.map(s => s.split(this.itemDelimiter)));
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}
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/**
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* Return the cartesian product of the two inputted sets.
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*
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* @param {Object[]} a
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* @param {Object[]} b
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* @param {Object[]} c
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* @returns {string}
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*/
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runCartesianProduct(a, b, ...c) {
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/**
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* https://stackoverflow.com/a/43053803/7200497
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* @returns {Object[]}
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*/
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const f = (a, b) => [].concat(...a.map(d => b.map(e => [].concat(d, e))));
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/**
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* https://stackoverflow.com/a/43053803/7200497
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* @returns {Object[][]}
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*/
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const cartesian = (a, b, ...c) => (b ? cartesian(f(a, b), ...c) : a);
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return cartesian(a, b, ...c)
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.map(set => `(${set.join(",")})`)
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.join(this.itemDelimiter);
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}
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}
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export default CartesianProduct;
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