scramble-generator/lib/index.js

Generate scrambles for Rubik's cubes

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Faces = exports.formatScramble = undefined;

var _scrambleUtilsCommon = require('scramble-utils-common');

Object.defineProperty(exports, 'Faces', {
  enumerable: true,
  get: function get() {
    return _scrambleUtilsCommon.Faces;
  }
});

var _helpers = require('./helpers');

var _formatter = require('./formatter');

var _formatter2 = _interopRequireDefault(_formatter);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Generates a random scramble for the given cube size.
 * @example
 * import generateScramble from 'scramble-generator';
 * generateScramble();
 * // R' U F D' L ...
 *
 * generateScramble({ cubeSize: 3, formatted: false });
 * // [ { face: 'U', inverted: false, double: true },
 * // { face: 'R', inverted: true, double: false },
 * // { face: 'D', inverted: false, double: true }, ... ]
 */
var generateScramble = function generateScramble() {
  var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      _ref$cubeSize = _ref.cubeSize,
      cubeSize = _ref$cubeSize === undefined ? 3 : _ref$cubeSize,
      _ref$length = _ref.length,
      length = _ref$length === undefined ? (cubeSize - 2) * 20 || 8 : _ref$length,
      _ref$formatted = _ref.formatted,
      formatted = _ref$formatted === undefined ? true : _ref$formatted;

  var scramble = [];
  var maxLayers = Math.floor(cubeSize / 2);
  var lastAxis = void 0;
  for (var i = 0; i < length; i++) {
    var faceSelections = _scrambleUtilsCommon.FaceList.filter(function (face) {
      return _scrambleUtilsCommon.FaceAxisInfo[face] !== lastAxis;
    });
    var rand = (0, _helpers.randomInRange)(0, faceSelections.length);
    var face = faceSelections[rand];
    lastAxis = _scrambleUtilsCommon.FaceAxisInfo[face];
    scramble.push((0, _scrambleUtilsCommon.createMove)({
      face: face,
      inverted: (0, _helpers.coinFlip)(),
      double: (0, _helpers.coinFlip)(),
      layerCount: (0, _helpers.randomInRange)(1, maxLayers + 1)
    }));
  }
  return formatted ? (0, _formatter2.default)(scramble) : scramble;
};

exports.formatScramble = _formatter2.default;
exports.default = generateScramble;