src/directives/stateDirectives.ts

/**
 * # Angular 1 Directives
 *
 * These are the directives included in UI-Router for Angular 1.
 * These directives are used in templates to create viewports and link/navigate to states.
 *
 * @ng1api
 * @preferred
 * @module directives
 */ /** for typedoc */
import { ng as angular } from "../angular";
import { IAugmentedJQuery, ITimeoutService, IScope, IInterpolateService } from "angular";

import {
    Obj, extend, forEach, tail, isString, isObject, isArray, parse, noop, unnestR, identity, uniqR, inArray, removeFrom,
    RawParams, PathNode, StateOrName, StateService, StateDeclaration, UIRouter
} from "ui-router-core";
import { UIViewData } from "./viewDirective";

/** @hidden Used for typedoc */
export interface ng1_directive {}

/** @hidden */
function parseStateRef(ref: string) {
  let paramsOnly = ref.match(/^\s*({[^}]*})\s*$/), parsed;
  if (paramsOnly) ref = '(' + paramsOnly[1] + ')';

  parsed = ref.replace(/\n/g, " ").match(/^\s*([^(]*?)\s*(\((.*)\))?\s*$/);
  if (!parsed || parsed.length !== 4) throw new Error("Invalid state ref '" + ref + "'");
  return { state: parsed[1] || null, paramExpr: parsed[3] || null };
}

/** @hidden */
function stateContext(el: IAugmentedJQuery) {
  let $uiView: UIViewData = (el.parent() as IAugmentedJQuery).inheritedData('$uiView');
  let path: PathNode[] = parse('$cfg.path')($uiView);
  return path ? tail(path).state.name : undefined;
}

/** @hidden */
function processedDef($state: StateService, $element: IAugmentedJQuery, def: Def): Def {
  let uiState = def.uiState || $state.current.name;
  let uiStateOpts = extend(defaultOpts($element, $state), def.uiStateOpts || {});
  let href = $state.href(uiState, def.uiStateParams, uiStateOpts);
  return { uiState, uiStateParams: def.uiStateParams, uiStateOpts, href };
}

/** @hidden */
interface TypeInfo {
  attr: string;
  isAnchor: boolean;
  clickable: boolean;
}

/** @hidden */
function getTypeInfo(el: IAugmentedJQuery): TypeInfo {
  // 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
  };
}

/** @hidden */
function clickHook(el: IAugmentedJQuery, $state: StateService, $timeout: ITimeoutService, type: TypeInfo, getDef: () => Def) {
  return function (e: JQueryMouseEventObject) {
    var button = e.which || e.button, target = getDef();

    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.uiState, target.uiStateParams, target.uiStateOpts);
      });
      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);
      };
    }
  };
}

/** @hidden */
function defaultOpts(el: IAugmentedJQuery, $state: StateService) {
  return {
    relative: stateContext(el) || $state.$current,
    inherit: true,
    source: "sref"
  };
}

/** @hidden */
function bindEvents(element: IAugmentedJQuery, scope: IScope, hookFn: (e: JQueryMouseEventObject) => void, uiStateOpts: any): void {
  let events;

  if (uiStateOpts) {
    events = uiStateOpts.events;
  }

  if (!isArray(events)) {
    events = ['click'];
  }

  let on = element.on ? 'on' : 'bind';
  for (let event of events) {
    element[on](event, hookFn);
  }

  scope.$on('$destroy', function() {
    let off = element.off ? 'off' : 'unbind';
    for (let event of events) {
      element[off](event, hookFn);
    }
  });
}

/**
 * `ui-sref`: A directive for linking to a state
 *
 * A directive which links to a state (and optionally, parameters).
 * When clicked, this directive activates the linked state with the supplied parameter values.
 *
 * ### Linked State
 * The attribute value of the `ui-sref` is the name of the state to link to.
 *
 * #### Example:
 * This will activate the `home` state when the link is clicked.
 * ```html
 * <a ui-sref="home">Home</a>
 * ```
 *
 * ### Relative Links
 * You can also use relative state paths within `ui-sref`, just like a relative path passed to `$state.go()` ([[StateService.go]]).
 * You just need to be aware that the path is relative to the state that *created* the link.
 * This allows a state to create a relative `ui-sref` which always targets the same destination.
 *
 * #### Example:
 * Both these links are relative to the parent state, even when a child state is currently active.
 * ```html
 * <a ui-sref=".child1">child 1 state</a>
 * <a ui-sref=".child2">child 2 state</a>
 * ```
 *
 * This link activates the parent state.
 * ```html
 * <a ui-sref="^">Return</a>
 * ```
 *
 * ### hrefs
 * If the linked state has a URL, the directive will automatically generate and
 * update the `href` attribute (using the [[StateService.href]]  method).
 *
 * #### Example:
 * Assuming the `users` state has a url of `/users/`
 * ```html
 * <a ui-sref="users" href="/users/">Users</a>
 * ```
 *
 * ### Parameter Values
 * In addition to the state name, a `ui-sref` can include parameter values which are applied when activating the state.
 * Param values can be provided in the `ui-sref` value after the state name, enclosed by parentheses.
 * The content inside the parentheses is an expression, evaluated to the parameter values.
 *
 * #### Example:
 * This example renders a list of links to users.
 * The state's `userId` parameter value comes from each user's `user.id` property.
 * ```html
 * <li ng-repeat="user in users">
 *   <a ui-sref="users.detail({ userId: user.id })">{{ user.displayName }}</a>
 * </li>
 * ```
 *
 * Note:
 * The parameter values expression is `$watch`ed for updates.
 *
 * ### Transition Options
 * You can specify [[TransitionOptions]] to pass to [[StateService.go]] by using the `ui-sref-opts` attribute.
 * Options are restricted to `location`, `inherit`, and `reload`.
 *
 * #### Example:
 * ```html
 * <a ui-sref="home" ui-sref-opts="{ reload: true }">Home</a>
 * ```
 *
 * ### Other DOM Events
 *
 * You can also customize which DOM events to respond to (instead of `click`) by
 * providing an `events` array in the `ui-sref-opts` attribute.
 *
 * #### Example:
 * ```html
 * <input type="text" ui-sref="contacts" ui-sref-opts="{ events: ['change', 'blur'] }">
 * ```
 *
 * ### Highlighting the active link
 * This directive can be used in conjunction with [[uiSrefActive]] to highlight the active link.
 *
 * ### Examples
 * If you have the following template:
 *
 * ```html
 * <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>
 * ```
 *
 * Then (assuming the current state is `contacts`) the rendered html including hrefs would be:
 *
 * ```html
 * <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 href="#/home" ui-sref="home" ui-sref-opts="{reload: true}">Home</a>
 * ```
 *
 * ### Notes
 *
 * - You can use `ui-sref` to change **only the parameter values** by omitting the state name and parentheses.
 * #### Example:
 * Sets the `lang` parameter to `en` and remains on the same state.
 *
 * ```html
 * <a ui-sref="{ lang: 'en' }">English</a>
 * ```
 *
 * - A middle-click, right-click, or ctrl-click is handled (natively) by the browser to open the href in a new window, for example.
 *
 * - Unlike the parameter values expression, the state name is not `$watch`ed (for performance reasons).
 * If you need to dynamically update the state being linked to, use the fully dynamic [[uiState]] directive.
 */
let uiSref: ng1_directive;
uiSref = ['$uiRouter', '$timeout',
  function $StateRefDirective($uiRouter: UIRouter, $timeout: ITimeoutService) {
    let $state = $uiRouter.stateService;

    return {
      restrict: 'A',
      require: ['?^uiSrefActive', '?^uiSrefActiveEq'],
      link: function (scope: IScope, element: IAugmentedJQuery, attrs: any, uiSrefActive: any) {
        let type = getTypeInfo(element);
        let active = uiSrefActive[1] || uiSrefActive[0];
        let unlinkInfoFn: Function = null;
        let hookFn;

        let rawDef = {} as Def;
        let getDef = () => processedDef($state, element, rawDef);

        let ref = parseStateRef(attrs.uiSref);
        rawDef.uiState = ref.state;
        rawDef.uiStateOpts = attrs.uiSrefOpts ? scope.$eval(attrs.uiSrefOpts) : {};

        function update() {
          let def = getDef();
          if (unlinkInfoFn) unlinkInfoFn();
          if (active) unlinkInfoFn = active.$$addStateInfo(def.uiState, def.uiStateParams);
          if (def.href != null) attrs.$set(type.attr, def.href);
        }

        if (ref.paramExpr) {
          scope.$watch(ref.paramExpr, function (val) {
            rawDef.uiStateParams = extend({}, val);
            update();
          }, true);
          rawDef.uiStateParams = extend({}, scope.$eval(ref.paramExpr));
        }

        update();

        scope.$on('$destroy', <any> $uiRouter.stateRegistry.onStatesChanged(update));
        scope.$on('$destroy', <any> $uiRouter.transitionService.onSuccess({}, update));

        if (!type.clickable) return;
        hookFn = clickHook(element, $state, $timeout, type, getDef);
        bindEvents(element, scope, hookFn, rawDef.uiStateOpts);
      }
    };
  }];

/**
 * `ui-state`: A fully dynamic directive for linking to a state
 *
 * A directive which links to a state (and optionally, parameters).
 * When clicked, this directive activates the linked state with the supplied parameter values.
 *
 * **This directive is very similar to [[uiSref]], but it `$observe`s and `$watch`es/evaluates all its inputs.**
 *
 * A directive which links to a state (and optionally, parameters).
 * When clicked, this directive activates the linked state with the supplied parameter values.
 *
 * ### Linked State
 * The attribute value of `ui-state` is an expression which is `$watch`ed and evaluated as the state to link to.
 * **This is in contrast with `ui-sref`, which takes a state name as a string literal.**
 *
 * #### Example:
 * Create a list of links.
 * ```html
 * <li ng-repeat="link in navlinks">
 *   <a ui-state="link.state">{{ link.displayName }}</a>
 * </li>
 * ```
 *
 * ### Relative Links
 * If the expression evaluates to a relative path, it is processed like [[uiSref]].
 * You just need to be aware that the path is relative to the state that *created* the link.
 * This allows a state to create relative `ui-state` which always targets the same destination.
 *
 * ### hrefs
 * If the linked state has a URL, the directive will automatically generate and
 * update the `href` attribute (using the [[StateService.href]]  method).
 *
 * ### Parameter Values
 * In addition to the state name expression, a `ui-state` can include parameter values which are applied when activating the state.
 * Param values should be provided using the `ui-state-params` attribute.
 * The `ui-state-params` attribute value is `$watch`ed and evaluated as an expression.
 *
 * #### Example:
 * This example renders a list of links with param values.
 * The state's `userId` parameter value comes from each user's `user.id` property.
 * ```html
 * <li ng-repeat="link in navlinks">
 *   <a ui-state="link.state" ui-state-params="link.params">{{ link.displayName }}</a>
 * </li>
 * ```
 *
 * ### Transition Options
 * You can specify [[TransitionOptions]] to pass to [[StateService.go]] by using the `ui-state-opts` attribute.
 * Options are restricted to `location`, `inherit`, and `reload`.
 * The value of the `ui-state-opts` is `$watch`ed and evaluated as an expression.
 *
 * #### Example:
 * ```html
 * <a ui-state="returnto.state" ui-state-opts="{ reload: true }">Home</a>
 * ```
 *
 * ### Other DOM Events
 *
 * You can also customize which DOM events to respond to (instead of `click`) by
 * providing an `events` array in the `ui-state-opts` attribute.
 *
 * #### Example:
 * ```html
 * <input type="text" ui-state="contacts" ui-state-opts="{ events: ['change', 'blur'] }">
 * ```
 *
 * ### Highlighting the active link
 * This directive can be used in conjunction with [[uiSrefActive]] to highlight the active link.
 *
 * ### Notes
 *
 * - You can use `ui-params` to change **only the parameter values** by omitting the state name and supplying only `ui-state-params`.
 *   However, it might be simpler to use [[uiSref]] parameter-only links.
 *
 * #### Example:
 * Sets the `lang` parameter to `en` and remains on the same state.
 *
 * ```html
 * <a ui-state="" ui-state-params="{ lang: 'en' }">English</a>
 * ```
 *
 * - A middle-click, right-click, or ctrl-click is handled (natively) by the browser to open the href in a new window, for example.
 * ```
 */
let uiState: ng1_directive;
uiState = ['$uiRouter', '$timeout',
  function $StateRefDynamicDirective($uiRouter: UIRouter, $timeout: ITimeoutService) {
    let $state = $uiRouter.stateService;

    return {
      restrict: 'A',
      require: ['?^uiSrefActive', '?^uiSrefActiveEq'],
      link: function (scope: IScope, element: IAugmentedJQuery, attrs: any, uiSrefActive: any) {
        let type = getTypeInfo(element);
        let active = uiSrefActive[1] || uiSrefActive[0];
        let unlinkInfoFn: Function = null;
        let hookFn;

        let rawDef = {} as Def;
        let getDef = () => processedDef($state, element, rawDef);

        let inputAttrs = ['uiState', 'uiStateParams', 'uiStateOpts'];
        let watchDeregFns = inputAttrs.reduce((acc, attr) => (acc[attr] = noop, acc), {});

        function update() {
          let def = getDef();
          if (unlinkInfoFn) unlinkInfoFn();
          if (active) unlinkInfoFn = active.$$addStateInfo(def.uiState, def.uiStateParams);
          if (def.href != null) attrs.$set(type.attr, def.href);
        }

        inputAttrs.forEach((field) => {
          rawDef[field] = attrs[field] ? scope.$eval(attrs[field]) : null;

          attrs.$observe(field, (expr) => {
            watchDeregFns[field]();
            watchDeregFns[field] = scope.$watch(expr, (newval) => {
              rawDef[field] = newval;
              update();
            }, true);
          })
        });

        update();

        scope.$on('$destroy', <any> $uiRouter.stateRegistry.onStatesChanged(update));
        scope.$on('$destroy', <any> $uiRouter.transitionService.onSuccess({}, update));

        if (!type.clickable) return;
        hookFn = clickHook(element, $state, $timeout, type, getDef);
        bindEvents(element, scope, hookFn, rawDef.uiStateOpts);
      }
    };
  }];


/**
 * `ui-sref-active` and `ui-sref-active-eq`: A directive that adds a CSS class when a `ui-sref` is active
 *
 * A directive working alongside [[uiSref]] and [[uiState]] to add classes to an element when the
 * related directive's state is active (and remove them when it is inactive).
 *
 * The primary use-case is to highlight the active link in navigation menus,
 * distinguishing it from the inactive menu items.
 *
 * ### Linking to a `ui-sref` or `ui-state`
 * `ui-sref-active` can live on the same element as `ui-sref`/`ui-state`, or it can be on a parent element.
 * If a `ui-sref-active` is a parent to more than one `ui-sref`/`ui-state`, it will apply the CSS class when **any of the links are active**.
 *
 * ### Matching
 *
 * The `ui-sref-active` directive applies the CSS class when the `ui-sref`/`ui-state`'s target state **or any child state is active**.
 * This is a "fuzzy match" which uses [[StateService.includes]].
 *
 * The `ui-sref-active-eq` directive applies the CSS class when the `ui-sref`/`ui-state`'s target state is directly active (not when child states are active).
 * This is an "exact match" which uses [[StateService.is]].
 *
 * ### Parameter values
 * If the `ui-sref`/`ui-state` includes parameter values, the current parameter values must match the link's values for the link to be highlighted.
 * This allows a list of links to the same state with different parameters to be rendered, and the correct one highlighted.
 *
 * #### Example:
 * ```html
 * <li ng-repeat="user in users" ui-sref-active="active">
 *   <a ui-sref="user.details({ userId: user.id })">{{ user.lastName }}</a>
 * </li>
 * ```
 *
 * ### Examples
 *
 * Given the following template:
 * #### Example:
 * ```html
 * <ul>
 *   <li ui-sref-active="active" class="item">
 *     <a href ui-sref="app.user({user: 'bilbobaggins'})">@bilbobaggins</a>
 *   </li>
 * </ul>
 * ```
 *
 * When the app state is `app.user` (or any child state),
 * and contains the state parameter "user" with value "bilbobaggins",
 * the resulting HTML will appear as (note the 'active' class):
 *
 * ```html
 * <ul>
 *   <li ui-sref-active="active" class="item active">
 *     <a ui-sref="app.user({user: 'bilbobaggins'})" href="/users/bilbobaggins">@bilbobaggins</a>
 *   </li>
 * </ul>
 * ```
 *
 * ### Glob mode
 *
 * It is possible to pass `ui-sref-active` an expression that evaluates to an object.
 * The objects keys represent active class names and 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:
 * ```html
 * <div ui-sref-active="{'active': 'admin.**'}">
 *   <a ui-sref-active="active" ui-sref="admin.roles">Roles</a>
 * </div>
 * ```
 *
 * 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` override any state provided by a linked `ui-sref`.
 *
 * ### Notes:
 *
 * - 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: `ui-sref-active='class1 class2 class3'`
 */
let uiSrefActive: ng1_directive;
uiSrefActive = ['$state', '$stateParams', '$interpolate', '$uiRouter',
  function $StateRefActiveDirective($state: StateService, $stateParams: Obj, $interpolate: IInterpolateService, $uiRouter: UIRouter) {
    return {
      restrict: "A",
      controller: ['$scope', '$element', '$attrs',
        function ($scope: IScope, $element: IAugmentedJQuery, $attrs: any) {
          let states: StateData[] = [],
              activeEqClass: string,
              uiSrefActive: any;

          // 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: StateOrName, activeClass: string) {
              if (isString(stateOrName)) {
                let ref = parseStateRef(stateOrName);
                addState(ref.state, $scope.$eval(ref.paramExpr), activeClass);
              }
            });
          }

          // Allow uiSref to communicate with uiSrefActive[Equals]
          this.$$addStateInfo = function (newState: string, newParams: Obj) {
            // 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;
            }
            let deregister = addState(newState, newParams, uiSrefActive);
            update();
            return deregister;
          };

          function updateAfterTransition(trans) {
            trans.promise.then(update);
          }

          $scope.$on('$stateChangeSuccess', update);
          $scope.$on('$destroy', <any> $uiRouter.transitionService.onStart({}, updateAfterTransition));
          if ($uiRouter.globals.transition) {
            updateAfterTransition($uiRouter.globals.transition);
          }

          function addState(stateName: string, stateParams: Obj, activeClass: string) {
            var state = $state.get(stateName, stateContext($element));

            var stateInfo = {
              state: state || { name: stateName },
              params: stateParams,
              activeClass: activeClass
            };

            states.push(stateInfo);

            return function removeState() {
              removeFrom(states)(stateInfo);
            }
          }

          // Update route state
          function update() {
            const splitClasses = str =>
                str.split(/\s/).filter(identity);
            const getClasses = (stateList: StateData[]) =>
                stateList.map(x => x.activeClass).map(splitClasses).reduce(unnestR, []);

            let allClasses = getClasses(states).concat(splitClasses(activeEqClass)).reduce(uniqR, []);
            let fuzzyClasses = getClasses(states.filter(x => $state.includes(x.state.name, x.params)));
            let exactlyMatchesAny = !!states.filter(x => $state.is(x.state.name, x.params)).length;
            let exactClasses = exactlyMatchesAny ? splitClasses(activeEqClass) : [];

            let addClasses = fuzzyClasses.concat(exactClasses).reduce(uniqR, []);
            let removeClasses = allClasses.filter(cls => !inArray(addClasses, cls));

            $scope.$evalAsync(() => {
              addClasses.forEach(className => $element.addClass(className));
              removeClasses.forEach(className => $element.removeClass(className));
            });
          }

          update();
        }]
    };
  }];

/** @hidden */
interface Def { uiState: string; href: string; uiStateParams: Obj; uiStateOpts: any; }
/** @hidden */
interface StateData { state: StateDeclaration; params: RawParams; activeClass: string; }

angular.module('ui.router.state')
    .directive('uiSref', uiSref)
    .directive('uiSrefActive', uiSrefActive)
    .directive('uiSrefActiveEq', uiSrefActive)
    .directive('uiState', uiState);