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/*! * Module dependencies. */
'use strict';
const utils = require('./utils'); // eslint-disable-line no-unused-vars
/** * StateMachine represents a minimal `interface` for the * constructors it builds via StateMachine.ctor(...). * * @api private */
const StateMachine = module.exports = exports = function StateMachine() {};
/** * StateMachine.ctor('state1', 'state2', ...) * A factory method for subclassing StateMachine. * The arguments are a list of states. For each state, * the constructor's prototype gets state transition * methods named after each state. These transition methods * place their path argument into the given state. * * @param {String} state * @param {String} [state] * @return {Function} subclass constructor * @api private */
StateMachine.ctor = function() {  const states = [...arguments];
  const ctor = function() {    StateMachine.apply(this, arguments);    this.paths = {};    this.states = {};  };
  ctor.prototype = new StateMachine();
  ctor.prototype.stateNames = states;
  states.forEach(function(state) {    // Changes the `path`'s state to `state`.    ctor.prototype[state] = function(path) {      this._changeState(path, state);    };  });
  return ctor;};
/** * This function is wrapped by the state change functions: * * - `require(path)` * - `modify(path)` * - `init(path)` * * @api private */
StateMachine.prototype._changeState = function _changeState(path, nextState) {  const prevBucket = this.states[this.paths[path]];  if (prevBucket) delete prevBucket[path];
  this.paths[path] = nextState;  this.states[nextState] = this.states[nextState] || {};  this.states[nextState][path] = true;};
/*! * ignore */
StateMachine.prototype.clear = function clear(state) {  if (this.states[state] == null) {    return;  }  const keys = Object.keys(this.states[state]);  let i = keys.length;  let path;
  while (i--) {    path = keys[i];    delete this.states[state][path];    delete this.paths[path];  }};
/*! * ignore */
StateMachine.prototype.clearPath = function clearPath(path) {  const state = this.paths[path];  if (!state) {    return;  }  delete this.paths[path];  delete this.states[state][path];};
/** * Gets the paths for the given state, or empty object `{}` if none. * @api private */
StateMachine.prototype.getStatePaths = function getStatePaths(state) {  if (this.states[state] != null) {    return this.states[state];  }  return {};};
/** * Checks to see if at least one path is in the states passed in via `arguments` * e.g., this.some('required', 'inited') * * @param {String} state that we want to check for. * @api private */
StateMachine.prototype.some = function some() {  const _this = this;  const what = arguments.length ? arguments : this.stateNames;  return Array.prototype.some.call(what, function(state) {    if (_this.states[state] == null) {      return false;    }    return Object.keys(_this.states[state]).length;  });};
/** * This function builds the functions that get assigned to `forEach` and `map`, * since both of those methods share a lot of the same logic. * * @param {String} iterMethod is either 'forEach' or 'map' * @return {Function} * @api private */
StateMachine.prototype._iter = function _iter(iterMethod) {  return function() {    let states = [...arguments];    const callback = states.pop();
    if (!states.length) states = this.stateNames;
    const _this = this;
    const paths = states.reduce(function(paths, state) {      if (_this.states[state] == null) {        return paths;      }      return paths.concat(Object.keys(_this.states[state]));    }, []);
    return paths[iterMethod](function(path, i, paths) {      return callback(path, i, paths);    });  };};
/** * Iterates over the paths that belong to one of the parameter states. * * The function profile can look like: * this.forEach(state1, fn);         // iterates over all paths in state1 * this.forEach(state1, state2, fn); // iterates over all paths in state1 or state2 * this.forEach(fn);                 // iterates over all paths in all states * * @param {String} [state] * @param {String} [state] * @param {Function} callback * @api private */
StateMachine.prototype.forEach = function forEach() {  this.forEach = this._iter('forEach');  return this.forEach.apply(this, arguments);};
/** * Maps over the paths that belong to one of the parameter states. * * The function profile can look like: * this.forEach(state1, fn);         // iterates over all paths in state1 * this.forEach(state1, state2, fn); // iterates over all paths in state1 or state2 * this.forEach(fn);                 // iterates over all paths in all states * * @param {String} [state] * @param {String} [state] * @param {Function} callback * @return {Array} * @api private */
StateMachine.prototype.map = function map() {  this.map = this._iter('map');  return this.map.apply(this, arguments);};