state.js

/**
 * @ngdoc object
 * @name ui.router.state.$stateProvider
 *
 * @requires ui.router.router.$urlRouterProvider
 * @requires ui.router.util.$urlMatcherFactoryProvider
 * @requires $locationProvider
 *
 * @description
 * The new `$stateProvider` works similar to Angular's v1 router, but it focuses purely
 * on state.
 *
 * A state corresponds to a "place" in the application in terms of the overall UI and
 * navigation. A state describes (via the controller / template / view properties) what
 * the UI looks like and does at that place.
 *
 * States often have things in common, and the primary way of factoring out these
 * commonalities in this model is via the state hierarchy, i.e. parent/child states aka
 * nested states.
 *
 * The `$stateProvider` provides interfaces to declare these states for your app.
 */
$StateProvider.$inject = ['$urlRouterProvider', '$urlMatcherFactoryProvider', '$locationProvider'];
function $StateProvider(   $urlRouterProvider,   $urlMatcherFactory,           $locationProvider) {

  var root, states = {}, $state, queue = {}, abstractKey = 'abstract';

  // Builds state properties from definition passed to registerState()
  var stateBuilder = {

    // Derive parent state from a hierarchical name only if 'parent' is not explicitly defined.
    // state.children = [];
    // if (parent) parent.children.push(state);
    parent: function(state) {
      if (isDefined(state.parent) && state.parent) return findState(state.parent);
      // regex matches any valid composite state name
      // would match "contact.list" but not "contacts"
      var compositeName = /^(.+)\.[^.]+$/.exec(state.name);
      return compositeName ? findState(compositeName[1]) : root;
    },

    // inherit 'data' from parent and override by own values (if any)
    data: function(state) {
      if (state.parent && state.parent.data) {
        state.data = state.self.data = extend({}, state.parent.data, state.data);
      }
      return state.data;
    },

    // Build a URLMatcher if necessary, either via a relative or absolute URL
    url: function(state) {
      var url = state.url;

      if (isString(url)) {
        if (url.charAt(0) == '^') {
          return $urlMatcherFactory.compile(url.substring(1), state.strict);
        }
        return (state.parent.navigable || root).url.concat(url, state.strict);
      }

      if ($urlMatcherFactory.isMatcher(url) || url == null) {
        return url;
      }
      throw new Error("Invalid url '" + url + "' in state '" + state + "'");
    },

    // Keep track of the closest ancestor state that has a URL (i.e. is navigable)
    navigable: function(state) {
      return state.url ? state : (state.parent ? state.parent.navigable : null);
    },

    // Derive parameters for this state and ensure they're a super-set of parent's parameters
    params: function(state) {
      if (!state.params) {
        return state.url ? state.url.parameters() : state.parent.params;
      }
      if (!isArray(state.params)) throw new Error("Invalid params in state '" + state + "'");
      if (state.url) throw new Error("Both params and url specicified in state '" + state + "'");
      return state.params;
    },

    // If there is no explicit multi-view configuration, make one up so we don't have
    // to handle both cases in the view directive later. Note that having an explicit
    // 'views' property will mean the default unnamed view properties are ignored. This
    // is also a good time to resolve view names to absolute names, so everything is a
    // straight lookup at link time.
    views: function(state) {
      var views = {};

      forEach(isDefined(state.views) ? state.views : { '': state }, function (view, name) {
        if (name.indexOf('@') < 0) name += '@' + state.parent.name;
        views[name] = view;
      });
      return views;
    },

    ownParams: function(state) {
      if (!state.parent) {
        return state.params;
      }
      var paramNames = {}; forEach(state.params, function (p) { paramNames[p] = true; });

      forEach(state.parent.params, function (p) {
        if (!paramNames[p]) {
          throw new Error("Missing required parameter '" + p + "' in state '" + state.name + "'");
        }
        paramNames[p] = false;
      });
      var ownParams = [];

      forEach(paramNames, function (own, p) {
        if (own) ownParams.push(p);
      });
      return ownParams;
    },

    // Keep a full path from the root down to this state as this is needed for state activation.
    path: function(state) {
      return state.parent ? state.parent.path.concat(state) : []; // exclude root from path
    },

    // Speed up $state.contains() as it's used a lot
    includes: function(state) {
      var includes = state.parent ? extend({}, state.parent.includes) : {};
      includes[state.name] = true;
      return includes;
    },

    $delegates: {}
  };

  function isRelative(stateName) {
    return stateName.indexOf(".") === 0 || stateName.indexOf("^") === 0;
  }

  function findState(stateOrName, base) {
    var isStr = isString(stateOrName),
        name  = isStr ? stateOrName : stateOrName.name,
        path  = isRelative(name);

    if (path) {
      if (!base) throw new Error("No reference point given for path '"  + name + "'");
      var rel = name.split("."), i = 0, pathLength = rel.length, current = base;

      for (; i < pathLength; i++) {
        if (rel[i] === "" && i === 0) {
          current = base;
          continue;
        }
        if (rel[i] === "^") {
          if (!current.parent) throw new Error("Path '" + name + "' not valid for state '" + base.name + "'");
          current = current.parent;
          continue;
        }
        break;
      }
      rel = rel.slice(i).join(".");
      name = current.name + (current.name && rel ? "." : "") + rel;
    }
    var state = states[name];

    if (state && (isStr || (!isStr && (state === stateOrName || state.self === stateOrName)))) {
      return state;
    }
    return undefined;
  }

  function queueState(parentName, state) {
    if (!queue[parentName]) {
      queue[parentName] = [];
    }
    queue[parentName].push(state);
  }

  function registerState(state) {
    // Wrap a new object around the state so we can store our private details easily.
    state = inherit(state, {
      self: state,
      resolve: state.resolve || {},
      toString: function() { return this.name; }
    });

    var name = state.name;
    if (!isString(name) || name.indexOf('@') >= 0) throw new Error("State must have a valid name");
    if (states.hasOwnProperty(name)) throw new Error("State '" + name + "'' is already defined");

    // Get parent name
    var parentName = (name.indexOf('.') !== -1) ? name.substring(0, name.lastIndexOf('.'))
        : (isString(state.parent)) ? state.parent
        : '';

    // If parent is not registered yet, add state to queue and register later
    if (parentName && !states[parentName]) {
      return queueState(parentName, state.self);
    }

    for (var key in stateBuilder) {
      if (isFunction(stateBuilder[key])) state[key] = stateBuilder[key](state, stateBuilder.$delegates[key]);
    }
    states[name] = state;

    // Register the state in the global state list and with $urlRouter if necessary.
    if (!state[abstractKey] && state.url) {
      $urlRouterProvider.when(state.url, ['$match', '$stateParams', function ($match, $stateParams) {
        if ($state.$current.navigable != state || !equalForKeys($match, $stateParams, state.ownParams)) {
          $state.transitionTo(state, $match, { location: false });
        }
      }]);
    }

    // Register any queued children
    if (queue[name]) {
      for (var i = 0; i < queue[name].length; i++) {
        registerState(queue[name][i]);
      }
    }

    return state;
  }


  // Implicit root state that is always active
  root = registerState({
    name: '',
    url: '^',
    views: null,
    'abstract': true
  });
  root.navigable = null;


  /**
   * @ngdoc function
   * @name ui.router.state.$stateProvider#decorator
   * @methodOf ui.router.state.$stateProvider
   *
   * @description
   * Allows you to extend (carefully) or override (at your own peril) the 
   * `stateBuilder` object used internally by `$stateProvider`. This can be used 
   * to add custom functionality to ui-router, for example inferring templateUrl 
   * based on the state name.
   *
   * When passing only a name, it returns the current (original or decorated) builder
   * function that matches `name`.
   *
   * The builder functions that can be decorated are listed below. Though not all
   * necessarily have a good use case for decoration, that is up to you to decide.
   *
   * In addition, users can attach custom decorators, which will generate new 
   * properties within the state's internal definition. There is currently no clear 
   * use-case for this beyond accessing internal states (i.e. $state.$current), 
   * however, expect this to become increasingly relevant as we introduce additional 
   * meta-programming features.
   *
   * **Warning**: Decorators should not be interdependent because the order of 
   * execution of the builder functions in nondeterministic. Builder functions 
   * should only be dependent on the state definition object and super function.
   *
   *
   * Existing builder functions and current return values:
   *
   * - parent - `{object}` - returns the parent state object.
   * - data - `{object}` - returns state data, including any inherited data that is not
   *   overridden by own values (if any).
   * - url - `{object}` - returns a UrlMatcher or null.
   * - navigable - returns closest ancestor state that has a URL (aka is 
   *   navigable).
   * - params - `{object}` - returns an array of state params that are ensured to 
   *   be a super-set of parent's params.
   * - views - `{object}` - returns a views object where each key is an absolute view 
   *   name (i.e. "viewName@stateName") and each value is the config object 
   *   (template, controller) for the view. Even when you don't use the views object 
   *   explicitly on a state config, one is still created for you internally.
   *   So by decorating this builder function you have access to decorating template 
   *   and controller properties.
   * - ownParams - `{object}` - returns an array of params that belong to the state, 
   *   not including any params defined by ancestor states.
   * - path - `{string}` - returns the full path from the root down to this state. 
   *   Needed for state activation.
   * - includes - `{object}` - returns an object that includes every state that 
   *   would pass a '$state.includes()' test.
   *
   * @example
   * <pre>
   * // Override the internal 'views' builder with a function that takes the state
   * // definition, and a reference to the internal function being overridden:
   * $stateProvider.decorator('views', function ($state, parent) {
   *   var result = {},
   *       views = parent(state);
   *
   *   angular.forEach(view, function (config, name) {
   *     var autoName = (state.name + '.' + name).replace('.', '/');
   *     config.templateUrl = config.templateUrl || '/partials/' + autoName + '.html';
   *     result[name] = config;
   *   });
   *   return result;
   * });
   *
   * $stateProvider.state('home', {
   *   views: {
   *     'contact.list': { controller: 'ListController' },
   *     'contact.item': { controller: 'ItemController' }
   *   }
   * });
   *
   * // ...
   *
   * $state.go('home');
   * // Auto-populates list and item views with /partials/home/contact/list.html,
   * // and /partials/home/contact/item.html, respectively.
   * </pre>
   *
   * @param {string} name The name of the builder function to decorate. 
   * @param {object} func A function that is responsible for decorating the original 
   * builder function. The function receives two parameters:
   *
   *   - `{object}` - state - The state config object.
   *   - `{object}` - super - The original builder function.
   *
   * @return {object} $stateProvider - $stateProvider instance
   */
  this.decorator = decorator;
  function decorator(name, func) {
    /*jshint validthis: true */
    if (isString(name) && !isDefined(func)) {
      return stateBuilder[name];
    }
    if (!isFunction(func) || !isString(name)) {
      return this;
    }
    if (stateBuilder[name] && !stateBuilder.$delegates[name]) {
      stateBuilder.$delegates[name] = stateBuilder[name];
    }
    stateBuilder[name] = func;
    return this;
  }

  /**
   * @ngdoc function
   * @name ui.router.state.$stateProvider#state
   * @methodOf ui.router.state.$stateProvider
   *
   * @description
   * Registers a state configuration under a given state name. The stateConfig object
   * has the following acceptable properties.
   * 
   * - [`template`, `templateUrl`, `templateProvider`] - There are three ways to setup
   *   your templates.
   *
   *   - `{string|object}` - template - String HTML content, or function that returns an HTML
   *   string.
   *   - `{string}` - templateUrl - String URL path to template file OR function,
   *   that returns URL path string.
   *   - `{object}` - templateProvider - Provider function that returns HTML content
   *   string.
   *
   * - [`controller`, `controllerProvider`] - A controller paired to the state. You can
   *   either use a controller, or a controller provider.
   *
   *   - `{string|object}` - controller - Controller function or controller name.
   *   - `{object}` - controllerProvider - Injectable provider function that returns
   *   the actual controller or string.
   *
   * - `{object}` - resolve - A map of dependencies which should be injected into the
   *   controller.
   *
   * - `{string}` - url - A url with optional parameters. When a state is navigated or
   *   transitioned to, the `$stateParams` service will be populated with any 
   *   parameters that were passed.
   *
   * - `{object}` - params - An array of parameter names or regular expressions. Only 
   *   use this within a state if you are not using url. Otherwise you can specify your
   *   parameters within the url. When a state is navigated or transitioned to, the 
   *   $stateParams service will be populated with any parameters that were passed.
   *
   * - `{object}` - views - Use the views property to set up multiple views. 
   *   If you don't need multiple views within a single state this property is not 
   *   needed. Tip: remember that often nested views are more useful and powerful 
   *   than multiple sibling views.
   *
   * - `{boolean}` - abstract - An abstract state will never be directly activated, 
   *   but can provide inherited properties to its common children states.
   *
   * - `{object}` - onEnter - Callback function for when a state is entered. Good way
   *   to trigger an action or dispatch an event, such as opening a dialog.
   *
   * - `{object}` - onExit - Callback function for when a state is exited. Good way to
   *   trigger an action or dispatch an event, such as opening a dialog.
   *
   * - `{object}` - data - Arbitrary data object, useful for custom configuration.
   *
   * @example
   * <pre>
   * // The state() method takes a unique stateName (String) and a stateConfig (Object)
   * $stateProvider.state(stateName, stateConfig);
   *
   * // stateName can be a single top-level name (must be unique).
   * $stateProvider.state("home", {});
   *
   * // Or it can be a nested state name. This state is a child of the above "home" state.
   * $stateProvider.state("home.newest", {});
   *
   * // Nest states as deeply as needed.
   * $stateProvider.state("home.newest.abc.xyz.inception", {});
   *
   * // state() returns $stateProvider, so you can chain state declarations.
   * $stateProvider
   *   .state("home", {})
   *   .state("about", {})
   *   .state("contacts", {});
   * </pre>
   *
   * @param {string} name A unique state name, e.g. "home", "about", "contacts". 
   * To create a parent/child state use a dot, e.g. "about.sales", "home.newest".
   * @param {object} definition State configuratino object.
   */
  this.state = state;
  function state(name, definition) {
    /*jshint validthis: true */
    if (isObject(name)) definition = name;
    else definition.name = name;
    registerState(definition);
    return this;
  }

  /**
   * @ngdoc object
   * @name ui.router.state.$state
   *
   * @requires $rootScope
   * @requires $q
   * @requires ui.router.state.$view
   * @requires $injector
   * @requires ui.router.util.$resolve
   * @requires ui.router.state.$stateParams
   *
   * @property {object} params A param object, e.g. {sectionId: section.id)}, that 
   * you'd like to test against the current active state.
   * @property {object} current A reference to the state's config object. However 
   * you passed it in. Useful for accessing custom data.
   * @property {object} transition Currently pending transition. A promise that'll 
   * resolve or reject.
   *
   * @description
   * `$state` service is responsible for representing states as well as transitioning
   * between them. It also provides interfaces to ask for current state or even states
   * you're coming from.
   */
  // $urlRouter is injected just to ensure it gets instantiated
  this.$get = $get;
  $get.$inject = ['$rootScope', '$q', '$view', '$injector', '$resolve', '$stateParams', '$location', '$urlRouter'];
  function $get(   $rootScope,   $q,   $view,   $injector,   $resolve,   $stateParams,   $location,   $urlRouter) {

    var TransitionSuperseded = $q.reject(new Error('transition superseded'));
    var TransitionPrevented = $q.reject(new Error('transition prevented'));
    var TransitionAborted = $q.reject(new Error('transition aborted'));
    var TransitionFailed = $q.reject(new Error('transition failed'));
    var currentLocation = $location.url();

    function syncUrl() {
      if ($location.url() !== currentLocation) {
        $location.url(currentLocation);
        $location.replace();
      }
    }

    root.locals = { resolve: null, globals: { $stateParams: {} } };
    $state = {
      params: {},
      current: root.self,
      $current: root,
      transition: null
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#reload
     * @methodOf ui.router.state.$state
     *
     * @description
     * Reloads the current state by re-transitioning to it.
     *
     * @example
     * <pre>
     * var app angular.module('app', ['ui.router.state']);
     *
     * app.controller('ctrl', function ($state) {
     *   $state.reload();
     * });
     * </pre>
     */
    $state.reload = function reload() {
      $state.transitionTo($state.current, $stateParams, { reload: true, inherit: false, notify: false });
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#go
     * @methodOf ui.router.state.$state
     *
     * @description
     * Convenience method for transitioning to a new state. `$state.go` calls 
     * `$state.transitionTo` internally but automatically sets options to 
     * `{ location: true, inherit: true, relative: $state.$current, notify: true }`. 
     * This allows you to easily use an absolute or relative to path and specify 
     * only the parameters you'd like to update (while letting unspecified parameters 
     * inherit from the current state.
     *
     * Some examples:
     *
     * - `$state.go('contact.detail')` - will go to the `contact.detail` state
     * - `$state.go('^')` - will go to a parent state
     * - `$state.go('^.sibling')` - will go to a sibling state
     * - `$state.go('.child.grandchild')` - will go to grandchild state
     *
     * @example
     * <pre>
     * var app = angular.module('app', ['ui.router.state']);
     *
     * app.controller('ctrl', function ($scope, $state) {
     *   $scope.changeState = function () {
     *     $state.go('contact.detail');
     *   };
     * });
     * </pre>
     *
     * @param {string} to Absolute State Name or Relative State Path.
     * @param {object} params A map of the parameters that will be sent to the state, 
     * will populate $stateParams.
     * @param {object} options If Object is passed, object is an options hash.
     */
    $state.go = function go(to, params, options) {
      return this.transitionTo(to, params, extend({ inherit: true, relative: $state.$current }, options));
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#transitionTo
     * @methodOf ui.router.state.$state
     *
     * @description
     * Low-level method for transitioning to a new state. {@link ui.router.state.$state#methods_go $state.go}
     * uses `transitionTo` internally. `$state.go` is recommended in most situations.
     *
     * @example
     * <pre>
     * var app = angular.module('app', ['ui.router.state']);
     *
     * app.controller('ctrl', function ($scope, $state) {
     *   $scope.changeState = function () {
     *     $state.transitionTo('contact.detail');
     *   };
     * });
     * </pre>
     *
     * @param {string} to Absolute State Name or Relative State Path.
     * @param {object} params A map of the parameters that will be sent to the state, 
     * will populate $stateParams.
     * @param {object} options If Object is passed, object is an options hash.
     */
    $state.transitionTo = function transitionTo(to, toParams, options) {
      toParams = toParams || {};
      options = extend({
        location: true, inherit: false, relative: null, notify: true, reload: false, $retry: false
      }, options || {});

      var from = $state.$current, fromParams = $state.params, fromPath = from.path;
      var evt, toState = findState(to, options.relative);

      if (!isDefined(toState)) {
        // Broadcast not found event and abort the transition if prevented
        var redirect = { to: to, toParams: toParams, options: options };
        evt = $rootScope.$broadcast('$stateNotFound', redirect, from.self, fromParams);
        if (evt.defaultPrevented) {
          syncUrl();
          return TransitionAborted;
        }

        // Allow the handler to return a promise to defer state lookup retry
        if (evt.retry) {
          if (options.$retry) {
            syncUrl();
            return TransitionFailed;
          }
          var retryTransition = $state.transition = $q.when(evt.retry);
          retryTransition.then(function() {
            if (retryTransition !== $state.transition) return TransitionSuperseded;
            redirect.options.$retry = true;
            return $state.transitionTo(redirect.to, redirect.toParams, redirect.options);
          }, function() {
            return TransitionAborted;
          });
          syncUrl();
          return retryTransition;
        }

        // Always retry once if the $stateNotFound was not prevented
        // (handles either redirect changed or state lazy-definition)
        to = redirect.to;
        toParams = redirect.toParams;
        options = redirect.options;
        toState = findState(to, options.relative);
        if (!isDefined(toState)) {
          if (options.relative) throw new Error("Could not resolve '" + to + "' from state '" + options.relative + "'");
          throw new Error("No such state '" + to + "'");
        }
      }
      if (toState[abstractKey]) throw new Error("Cannot transition to abstract state '" + to + "'");
      if (options.inherit) toParams = inheritParams($stateParams, toParams || {}, $state.$current, toState);
      to = toState;

      var toPath = to.path;

      // Starting from the root of the path, keep all levels that haven't changed
      var keep, state, locals = root.locals, toLocals = [];
      for (keep = 0, state = toPath[keep];
           state && state === fromPath[keep] && equalForKeys(toParams, fromParams, state.ownParams) && !options.reload;
           keep++, state = toPath[keep]) {
        locals = toLocals[keep] = state.locals;
      }

      // If we're going to the same state and all locals are kept, we've got nothing to do.
      // But clear 'transition', as we still want to cancel any other pending transitions.
      // TODO: We may not want to bump 'transition' if we're called from a location change that we've initiated ourselves,
      // because we might accidentally abort a legitimate transition initiated from code?
      if (shouldTriggerReload(to, from, locals, options) ) {
        if ( to.self.reloadOnSearch !== false )
          syncUrl();
        $state.transition = null;
        return $q.when($state.current);
      }

      // Normalize/filter parameters before we pass them to event handlers etc.
      toParams = normalize(to.params, toParams || {});

      // Broadcast start event and cancel the transition if requested
      if (options.notify) {
        evt = $rootScope.$broadcast('$stateChangeStart', to.self, toParams, from.self, fromParams);
        if (evt.defaultPrevented) {
          syncUrl();
          return TransitionPrevented;
        }
      }

      // Resolve locals for the remaining states, but don't update any global state just
      // yet -- if anything fails to resolve the current state needs to remain untouched.
      // We also set up an inheritance chain for the locals here. This allows the view directive
      // to quickly look up the correct definition for each view in the current state. Even
      // though we create the locals object itself outside resolveState(), it is initially
      // empty and gets filled asynchronously. We need to keep track of the promise for the
      // (fully resolved) current locals, and pass this down the chain.
      var resolved = $q.when(locals);
      for (var l=keep; l<toPath.length; l++, state=toPath[l]) {
        locals = toLocals[l] = inherit(locals);
        resolved = resolveState(state, toParams, state===to, resolved, locals);
      }

      // Once everything is resolved, we are ready to perform the actual transition
      // and return a promise for the new state. We also keep track of what the
      // current promise is, so that we can detect overlapping transitions and
      // keep only the outcome of the last transition.
      var transition = $state.transition = resolved.then(function () {
        var l, entering, exiting;

        if ($state.transition !== transition) return TransitionSuperseded;

        // Exit 'from' states not kept
        for (l=fromPath.length-1; l>=keep; l--) {
          exiting = fromPath[l];
          if (exiting.self.onExit) {
            $injector.invoke(exiting.self.onExit, exiting.self, exiting.locals.globals);
          }
          exiting.locals = null;
        }

        // Enter 'to' states not kept
        for (l=keep; l<toPath.length; l++) {
          entering = toPath[l];
          entering.locals = toLocals[l];
          if (entering.self.onEnter) {
            $injector.invoke(entering.self.onEnter, entering.self, entering.locals.globals);
          }
        }

        // Run it again, to catch any transitions in callbacks
        if ($state.transition !== transition) return TransitionSuperseded;

        // Update globals in $state
        $state.$current = to;
        $state.current = to.self;
        $state.params = toParams;
        copy($state.params, $stateParams);
        $state.transition = null;

        // Update $location
        var toNav = to.navigable;
        if (options.location && toNav) {
          $location.url(toNav.url.format(toNav.locals.globals.$stateParams));

          if (options.location === 'replace') {
            $location.replace();
          }
        }

        if (options.notify) {
          $rootScope.$broadcast('$stateChangeSuccess', to.self, toParams, from.self, fromParams);
        }
        currentLocation = $location.url();

        return $state.current;
      }, function (error) {
        if ($state.transition !== transition) return TransitionSuperseded;

        $state.transition = null;
        $rootScope.$broadcast('$stateChangeError', to.self, toParams, from.self, fromParams, error);
        syncUrl();

        return $q.reject(error);
      });

      return transition;
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#is
     * @methodOf ui.router.state.$state
     *
     * @description
     * Similar to {@link ui.router.state.$state#methods_includes $state.includes},
     * but only checks for the full state name. If params is supplied then it will be 
     * tested for strict equality against the current active params object, so all params 
     * must match with none missing and no extras.
     *
     * @example
     * <pre>
     * $state.is('contact.details.item'); // returns true
     * $state.is(contactDetailItemStateObject); // returns true
     *
     * // everything else would return false
     * </pre>
     *
     * @param {string|object} stateName The state name or state object you'd like to check.
     * @param {object} params A param object, e.g. `{sectionId: section.id}`, that you'd like 
     * to test against the current active state.
     * @returns {boolean} Returns true or false whether its the state or not.
     */
    $state.is = function is(stateOrName, params) {
      var state = findState(stateOrName);

      if (!isDefined(state)) {
        return undefined;
      }

      if ($state.$current !== state) {
        return false;
      }

      return isDefined(params) && params !== null ? angular.equals($stateParams, params) : true;
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#includes
     * @methodOf ui.router.state.$state
     *
     * @description
     * A method to determine if the current active state is equal to or is the child of the 
     * state stateName. If any params are passed then they will be tested for a match as well.
     * Not all the parameters need to be passed, just the ones you'd like to test for equality.
     *
     * @example
     * <pre>
     * $state.includes("contacts"); // returns true
     * $state.includes("contacts.details"); // returns true
     * $state.includes("contacts.details.item"); // returns true
     * $state.includes("contacts.list"); // returns false
     * $state.includes("about"); // returns false
     * </pre>
     *
     * @param {string} stateOrName A partial name to be searched for within the current state name.
     * @param {object} params A param object, e.g. `{sectionId: section.id}`, 
     * that you'd like to test against the current active state.
     * @returns {boolean} True or false
     */
    $state.includes = function includes(stateOrName, params) {
      var state = findState(stateOrName);
      if (!isDefined(state)) {
        return undefined;
      }

      if (!isDefined($state.$current.includes[state.name])) {
        return false;
      }

      var validParams = true;
      angular.forEach(params, function(value, key) {
        if (!isDefined($stateParams[key]) || $stateParams[key] !== value) {
          validParams = false;
        }
      });
      return validParams;
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#href
     * @methodOf ui.router.state.$state
     *
     * @description
     * A url generation method that returns the compiled url for the given state populated with the given params.
     *
     * @example
     * <pre>
     * expect($state.href("about.person", { person: "bob" })).toEqual("/about/bob");
     * </pre>
     *
     * @param {string|object} stateOrName The state name or state object you'd like to generate a url from.
     * @param {object} params An object of parameter values to fill the state's required parameters.
     * @returns {string} url
     */
    $state.href = function href(stateOrName, params, options) {
      options = extend({ lossy: true, inherit: false, absolute: false, relative: $state.$current }, options || {});
      var state = findState(stateOrName, options.relative);
      if (!isDefined(state)) return null;

      params = inheritParams($stateParams, params || {}, $state.$current, state);
      var nav = (state && options.lossy) ? state.navigable : state;
      var url = (nav && nav.url) ? nav.url.format(normalize(state.params, params || {})) : null;
      if (!$locationProvider.html5Mode() && url) {
        url = "#" + $locationProvider.hashPrefix() + url;
      }
      if (options.absolute && url) {
        url = $location.protocol() + '://' +
              $location.host() +
              ($location.port() == 80 || $location.port() == 443 ? '' : ':' + $location.port()) +
              (!$locationProvider.html5Mode() && url ? '/' : '') +
              url;
      }
      return url;
    };

    /**
     * @ngdoc function
     * @name ui.router.state.$state#get
     * @methodOf ui.router.state.$state
     *
     * @description
     * Returns the state configuration object for any state by passing the name
     * as a string. Without any arguments it'll return a array of all configured
     * state objects.
     *
     * @param {string|object} stateOrName The name of the state for which you'd like 
     * to get the original state configuration object for.
     * @returns {object} State configuration object or array of all objects.
     */
    $state.get = function (stateOrName, context) {
      if (!isDefined(stateOrName)) {
        var list = [];
        forEach(states, function(state) { list.push(state.self); });
        return list;
      }
      var state = findState(stateOrName, context);
      return (state && state.self) ? state.self : null;
    };

    function resolveState(state, params, paramsAreFiltered, inherited, dst) {
      // Make a restricted $stateParams with only the parameters that apply to this state if
      // necessary. In addition to being available to the controller and onEnter/onExit callbacks,
      // we also need $stateParams to be available for any $injector calls we make during the
      // dependency resolution process.
      var $stateParams = (paramsAreFiltered) ? params : filterByKeys(state.params, params);
      var locals = { $stateParams: $stateParams };

      // Resolve 'global' dependencies for the state, i.e. those not specific to a view.
      // We're also including $stateParams in this; that way the parameters are restricted
      // to the set that should be visible to the state, and are independent of when we update
      // the global $state and $stateParams values.
      dst.resolve = $resolve.resolve(state.resolve, locals, dst.resolve, state);
      var promises = [ dst.resolve.then(function (globals) {
        dst.globals = globals;
      }) ];
      if (inherited) promises.push(inherited);

      // Resolve template and dependencies for all views.
      forEach(state.views, function (view, name) {
        var injectables = (view.resolve && view.resolve !== state.resolve ? view.resolve : {});
        injectables.$template = [ function () {
          return $view.load(name, { view: view, locals: locals, params: $stateParams, notify: false }) || '';
        }];

        promises.push($resolve.resolve(injectables, locals, dst.resolve, state).then(function (result) {
          // References to the controller (only instantiated at link time)
          if (isFunction(view.controllerProvider) || isArray(view.controllerProvider)) {
            var injectLocals = angular.extend({}, injectables, locals);
            result.$$controller = $injector.invoke(view.controllerProvider, null, injectLocals);
          } else {
            result.$$controller = view.controller;
          }
          // Provide access to the state itself for internal use
          result.$$state = state;
          dst[name] = result;
        }));
      });

      // Wait for all the promises and then return the activation object
      return $q.all(promises).then(function (values) {
        return dst;
      });
    }

    return $state;
  }

  function shouldTriggerReload(to, from, locals, options) {
    if ( to === from && ((locals === from.locals && !options.reload) || (to.self.reloadOnSearch === false)) ) {
      return true;
    }
  }
}

angular.module('ui.router.state')
  .value('$stateParams', {})
  .provider('$state', $StateProvider);