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+function parseStateRef(ref, current) {
+  var preparsed = ref.match(/^\s*({[^}]*})\s*$/), parsed;
+  if (preparsed) ref = current + '(' + preparsed[1] + ')';
+  parsed = ref.replace(/\n/g, " ").match(/^([^(]+?)\s*(\((.*)\))?$/);
+  if (!parsed || parsed.length !== 4) throw new Error("Invalid state ref '" + ref + "'");
+  return { state: parsed[1], paramExpr: parsed[3] || null };
+}
+
+function stateContext(el) {
+  var stateData = el.parent().inheritedData('$uiView');
+
+  if (stateData && stateData.state && stateData.state.name) {
+    return stateData.state;
+  }
+}
+
+function getTypeInfo(el) {
+  // SVGAElement does not use the href attribute, but rather the 'xlinkHref' attribute.
+  var isSvg = Object.prototype.toString.call(el.prop('href')) === '[object SVGAnimatedString]';
+  var isForm = el[0].nodeName === "FORM";
+
+  return {
+    attr: isForm ? "action" : (isSvg ? 'xlink:href' : 'href'),
+    isAnchor: el.prop("tagName").toUpperCase() === "A",
+    clickable: !isForm
+  };
+}
+
+function clickHook(el, $state, $timeout, type, current) {
+  return function(e) {
+    var button = e.which || e.button, target = current();
+
+    if (!(button > 1 || e.ctrlKey || e.metaKey || e.shiftKey || el.attr('target'))) {
+      // HACK: This is to allow ng-clicks to be processed before the transition is initiated:
+      var transition = $timeout(function() {
+        $state.go(target.state, target.params, target.options);
+      });
+      e.preventDefault();
+
+      // if the state has no URL, ignore one preventDefault from the <a> directive.
+      var ignorePreventDefaultCount = type.isAnchor && !target.href ? 1: 0;
+
+      e.preventDefault = function() {
+        if (ignorePreventDefaultCount-- <= 0) $timeout.cancel(transition);
+      };
+    }
+  };
+}
+
+function defaultOpts(el, $state) {
+  return { relative: stateContext(el) || $state.$current, inherit: true };
+}
+
+/**
+ * @ngdoc directive
+ * @name ui.router.state.directive:ui-sref
+ *
+ * @requires ui.router.state.$state
+ * @requires $timeout
+ *
+ * @restrict A
+ *
+ * @description
+ * A directive that binds a link (`<a>` tag) to a state. If the state has an associated
+ * URL, the directive will automatically generate & update the `href` attribute via
+ * the {@link ui.router.state.$state#methods_href $state.href()} method. Clicking
+ * the link will trigger a state transition with optional parameters.
+ *
+ * Also middle-clicking, right-clicking, and ctrl-clicking on the link will be
+ * handled natively by the browser.
+ *
+ * You can also use relative state paths within ui-sref, just like the relative
+ * paths passed to `$state.go()`. You just need to be aware that the path is relative
+ * to the state that the link lives in, in other words the state that loaded the
+ * template containing the link.
+ *
+ * You can specify options to pass to {@link ui.router.state.$state#go $state.go()}
+ * using the `ui-sref-opts` attribute. Options are restricted to `location`, `inherit`,
+ * and `reload`.
+ *
+ * @example
+ * Here's an example of how you'd use ui-sref and how it would compile. If you have the
+ * following template:
+ * <pre>
+ * <a ui-sref="home">Home</a> | <a ui-sref="about">About</a> | <a ui-sref="{page: 2}">Next page</a>
+ *
+ * <ul>
+ *     <li ng-repeat="contact in contacts">
+ *         <a ui-sref="contacts.detail({ id: contact.id })">{{ contact.name }}</a>
+ *     </li>
+ * </ul>
+ * </pre>
+ *
+ * Then the compiled html would be (assuming Html5Mode is off and current state is contacts):
+ * <pre>
+ * <a href="#/home" ui-sref="home">Home</a> | <a href="#/about" ui-sref="about">About</a> | <a href="#/contacts?page=2" ui-sref="{page: 2}">Next page</a>
+ *
+ * <ul>
+ *     <li ng-repeat="contact in contacts">
+ *         <a href="#/contacts/1" ui-sref="contacts.detail({ id: contact.id })">Joe</a>
+ *     </li>
+ *     <li ng-repeat="contact in contacts">
+ *         <a href="#/contacts/2" ui-sref="contacts.detail({ id: contact.id })">Alice</a>
+ *     </li>
+ *     <li ng-repeat="contact in contacts">
+ *         <a href="#/contacts/3" ui-sref="contacts.detail({ id: contact.id })">Bob</a>
+ *     </li>
+ * </ul>
+ *
+ * <a ui-sref="home" ui-sref-opts="{reload: true}">Home</a>
+ * </pre>
+ *
+ * @param {string} ui-sref 'stateName' can be any valid absolute or relative state
+ * @param {Object} ui-sref-opts options to pass to {@link ui.router.state.$state#go $state.go()}
+ */
+$StateRefDirective.$inject = ['$state', '$timeout'];
+function $StateRefDirective($state, $timeout) {
+  return {
+    restrict: 'A',
+    require: ['?^uiSrefActive', '?^uiSrefActiveEq'],
+    link: function(scope, element, attrs, uiSrefActive) {
+      var ref    = parseStateRef(attrs.uiSref, $state.current.name);
+      var def    = { state: ref.state, href: null, params: null };
+      var type   = getTypeInfo(element);
+      var active = uiSrefActive[1] || uiSrefActive[0];
+
+      def.options = extend(defaultOpts(element, $state), attrs.uiSrefOpts ? scope.$eval(attrs.uiSrefOpts) : {});
+
+      var update = function(val) {
+        if (val) def.params = angular.copy(val);
+        def.href = $state.href(ref.state, def.params, def.options);
+
+        if (active) active.$$addStateInfo(ref.state, def.params);
+        if (def.href !== null) attrs.$set(type.attr, def.href);
+      };
+
+      if (ref.paramExpr) {
+        scope.$watch(ref.paramExpr, function(val) { if (val !== def.params) update(val); }, true);
+        def.params = angular.copy(scope.$eval(ref.paramExpr));
+      }
+      update();
+
+      if (!type.clickable) return;
+      element.bind("click", clickHook(element, $state, $timeout, type, function() { return def; }));
+    }
+  };
+}
+
+/**
+ * @ngdoc directive
+ * @name ui.router.state.directive:ui-state
+ *
+ * @requires ui.router.state.uiSref
+ *
+ * @restrict A
+ *
+ * @description
+ * Much like ui-sref, but will accept named $scope properties to evaluate for a state definition,
+ * params and override options.
+ *
+ * @param {string} ui-state 'stateName' can be any valid absolute or relative state
+ * @param {Object} ui-state-params params to pass to {@link ui.router.state.$state#href $state.href()}
+ * @param {Object} ui-state-opts options to pass to {@link ui.router.state.$state#go $state.go()}
+ */
+$StateRefDynamicDirective.$inject = ['$state', '$timeout'];
+function $StateRefDynamicDirective($state, $timeout) {
+  return {
+    restrict: 'A',
+    require: ['?^uiSrefActive', '?^uiSrefActiveEq'],
+    link: function(scope, element, attrs, uiSrefActive) {
+      var type   = getTypeInfo(element);
+      var active = uiSrefActive[1] || uiSrefActive[0];
+      var group  = [attrs.uiState, attrs.uiStateParams || null, attrs.uiStateOpts || null];
+      var watch  = '[' + group.map(function(val) { return val || 'null'; }).join(', ') + ']';
+      var def    = { state: null, params: null, options: null, href: null };
+
+      function runStateRefLink (group) {
+        def.state = group[0]; def.params = group[1]; def.options = group[2];
+        def.href = $state.href(def.state, def.params, def.options);
+
+        if (active) active.$$addStateInfo(def.state, def.params);
+        if (def.href) attrs.$set(type.attr, def.href);
+      }
+
+      scope.$watch(watch, runStateRefLink, true);
+      runStateRefLink(scope.$eval(watch));
+
+      if (!type.clickable) return;
+      element.bind("click", clickHook(element, $state, $timeout, type, function() { return def; }));
+    }
+  };
+}
+
+
+/**
+ * @ngdoc directive
+ * @name ui.router.state.directive:ui-sref-active
+ *
+ * @requires ui.router.state.$state
+ * @requires ui.router.state.$stateParams
+ * @requires $interpolate
+ *
+ * @restrict A
+ *
+ * @description
+ * A directive working alongside ui-sref to add classes to an element when the
+ * related ui-sref directive's state is active, and removing them when it is inactive.
+ * The primary use-case is to simplify the special appearance of navigation menus
+ * relying on `ui-sref`, by having the "active" state's menu button appear different,
+ * distinguishing it from the inactive menu items.
+ *
+ * ui-sref-active can live on the same element as ui-sref or on a parent element. The first
+ * ui-sref-active found at the same level or above the ui-sref will be used.
+ *
+ * Will activate when the ui-sref's target state or any child state is active. If you
+ * need to activate only when the ui-sref target state is active and *not* any of
+ * it's children, then you will use
+ * {@link ui.router.state.directive:ui-sref-active-eq ui-sref-active-eq}
+ *
+ * @example
+ * Given the following template:
+ * <pre>
+ * <ul>
+ *   <li ui-sref-active="active" class="item">
+ *     <a href ui-sref="app.user({user: 'bilbobaggins'})">@bilbobaggins</a>
+ *   </li>
+ * </ul>
+ * </pre>
+ *
+ *
+ * When the app state is "app.user" (or any children states), and contains the state parameter "user" with value "bilbobaggins",
+ * the resulting HTML will appear as (note the 'active' class):
+ * <pre>
+ * <ul>
+ *   <li ui-sref-active="active" class="item active">
+ *     <a ui-sref="app.user({user: 'bilbobaggins'})" href="/users/bilbobaggins">@bilbobaggins</a>
+ *   </li>
+ * </ul>
+ * </pre>
+ *
+ * The class name is interpolated **once** during the directives link time (any further changes to the
+ * interpolated value are ignored).
+ *
+ * Multiple classes may be specified in a space-separated format:
+ * <pre>
+ * <ul>
+ *   <li ui-sref-active='class1 class2 class3'>
+ *     <a ui-sref="app.user">link</a>
+ *   </li>
+ * </ul>
+ * </pre>
+ *
+ * It is also possible to pass ui-sref-active an expression that evaluates
+ * to an object hash, whose keys represent active class names and whose
+ * values represent the respective state names/globs.
+ * ui-sref-active will match if the current active state **includes** any of
+ * the specified state names/globs, even the abstract ones.
+ *
+ * @Example
+ * Given the following template, with "admin" being an abstract state:
+ * <pre>
+ * <div ui-sref-active="{'active': 'admin.*'}">
+ *   <a ui-sref-active="active" ui-sref="admin.roles">Roles</a>
+ * </div>
+ * </pre>
+ *
+ * When the current state is "admin.roles" the "active" class will be applied
+ * to both the <div> and <a> elements. It is important to note that the state
+ * names/globs passed to ui-sref-active shadow the state provided by ui-sref.
+ */
+
+/**
+ * @ngdoc directive
+ * @name ui.router.state.directive:ui-sref-active-eq
+ *
+ * @requires ui.router.state.$state
+ * @requires ui.router.state.$stateParams
+ * @requires $interpolate
+ *
+ * @restrict A
+ *
+ * @description
+ * The same as {@link ui.router.state.directive:ui-sref-active ui-sref-active} but will only activate
+ * when the exact target state used in the `ui-sref` is active; no child states.
+ *
+ */
+$StateRefActiveDirective.$inject = ['$state', '$stateParams', '$interpolate'];
+function $StateRefActiveDirective($state, $stateParams, $interpolate) {
+  return  {
+    restrict: "A",
+    controller: ['$scope', '$element', '$attrs', '$timeout', function ($scope, $element, $attrs, $timeout) {
+      var states = [], activeClasses = {}, activeEqClass, uiSrefActive;
+
+      // There probably isn't much point in $observing this
+      // uiSrefActive and uiSrefActiveEq share the same directive object with some
+      // slight difference in logic routing
+      activeEqClass = $interpolate($attrs.uiSrefActiveEq || '', false)($scope);
+
+      try {
+        uiSrefActive = $scope.$eval($attrs.uiSrefActive);
+      } catch (e) {
+        // Do nothing. uiSrefActive is not a valid expression.
+        // Fall back to using $interpolate below
+      }
+      uiSrefActive = uiSrefActive || $interpolate($attrs.uiSrefActive || '', false)($scope);
+      if (isObject(uiSrefActive)) {
+        forEach(uiSrefActive, function(stateOrName, activeClass) {
+          if (isString(stateOrName)) {
+            var ref = parseStateRef(stateOrName, $state.current.name);
+            addState(ref.state, $scope.$eval(ref.paramExpr), activeClass);
+          }
+        });
+      }
+
+      // Allow uiSref to communicate with uiSrefActive[Equals]
+      this.$$addStateInfo = function (newState, newParams) {
+        // we already got an explicit state provided by ui-sref-active, so we
+        // shadow the one that comes from ui-sref
+        if (isObject(uiSrefActive) && states.length > 0) {
+          return;
+        }
+        addState(newState, newParams, uiSrefActive);
+        update();
+      };
+
+      $scope.$on('$stateChangeSuccess', update);
+
+      function addState(stateName, stateParams, activeClass) {
+        var state = $state.get(stateName, stateContext($element));
+        var stateHash = createStateHash(stateName, stateParams);
+
+        states.push({
+          state: state || { name: stateName },
+          params: stateParams,
+          hash: stateHash
+        });
+
+        activeClasses[stateHash] = activeClass;
+      }
+
+      /**
+       * @param {string} state
+       * @param {Object|string} [params]
+       * @return {string}
+       */
+      function createStateHash(state, params) {
+        if (!isString(state)) {
+          throw new Error('state should be a string');
+        }
+        if (isObject(params)) {
+          return state + toJson(params);
+        }
+        params = $scope.$eval(params);
+        if (isObject(params)) {
+          return state + toJson(params);
+        }
+        return state;
+      }
+
+      // Update route state
+      function update() {
+        for (var i = 0; i < states.length; i++) {
+          if (anyMatch(states[i].state, states[i].params)) {
+            addClass($element, activeClasses[states[i].hash]);
+          } else {
+            removeClass($element, activeClasses[states[i].hash]);
+          }
+
+          if (exactMatch(states[i].state, states[i].params)) {
+            addClass($element, activeEqClass);
+          } else {
+            removeClass($element, activeEqClass);
+          }
+        }
+      }
+
+      function addClass(el, className) { $timeout(function () { el.addClass(className); }); }
+      function removeClass(el, className) { el.removeClass(className); }
+      function anyMatch(state, params) { return $state.includes(state.name, params); }
+      function exactMatch(state, params) { return $state.is(state.name, params); }
+
+      update();
+    }]
+  };
+}
+
+angular.module('ui.router.state')
+  .directive('uiSref', $StateRefDirective)
+  .directive('uiSrefActive', $StateRefActiveDirective)
+  .directive('uiSrefActiveEq', $StateRefActiveDirective)
+  .directive('uiState', $StateRefDynamicDirective);