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+
+/*!
+ * Module dependencies.
+ */
+
+var utils = require('./utils');
+
+/*!
+ * StateMachine represents a minimal `interface` for the
+ * constructors it builds via StateMachine.ctor(...).
+ *
+ * @api private
+ */
+
+var 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
+ * @private
+ */
+
+StateMachine.ctor = function() {
+  var states = utils.args(arguments);
+
+  var ctor = function() {
+    StateMachine.apply(this, arguments);
+    this.paths = {};
+    this.states = {};
+    this.stateNames = states;
+
+    var i = states.length,
+        state;
+
+    while (i--) {
+      state = states[i];
+      this.states[state] = {};
+    }
+  };
+
+  ctor.prototype = new StateMachine();
+
+  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) {
+  var prevBucket = this.states[this.paths[path]];
+  if (prevBucket) delete prevBucket[path];
+
+  this.paths[path] = nextState;
+  this.states[nextState][path] = true;
+};
+
+/*!
+ * ignore
+ */
+
+StateMachine.prototype.clear = function clear(state) {
+  var keys = Object.keys(this.states[state]),
+      i = keys.length,
+      path;
+
+  while (i--) {
+    path = keys[i];
+    delete this.states[state][path];
+    delete this.paths[path];
+  }
+};
+
+/*!
+ * 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.
+ * @private
+ */
+
+StateMachine.prototype.some = function some() {
+  var _this = this;
+  var what = arguments.length ? arguments : this.stateNames;
+  return Array.prototype.some.call(what, function(state) {
+    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() {
+    var numArgs = arguments.length,
+        states = utils.args(arguments, 0, numArgs - 1),
+        callback = arguments[numArgs - 1];
+
+    if (!states.length) states = this.stateNames;
+
+    var _this = this;
+
+    var paths = states.reduce(function(paths, state) {
+      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
+ * @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}
+ * @private
+ */
+
+StateMachine.prototype.map = function map() {
+  this.map = this._iter('map');
+  return this.map.apply(this, arguments);
+};