feat(aio): add tooltip to nav node if none specified

aio/src/app/navigation/navigation.service.spec.ts

@@ -80,20 +80,54 @@ describe('NavigationService', () => {
     it('should do WHAT(?) if the request fails');
   });
 
+  describe('node.tooltip', () => {
+    let view: NavigationNode[];
+
+    const sideNav: NavigationNode[] = [
+      { title: 'a', tooltip: 'a tip' },
+      { title: 'b' },
+      { title: 'c!'},
+      { url: 'foo' }
+    ];
+
+    beforeEach(() => {
+      navService.navigationViews.subscribe(views => view = views.sideNav);
+      backend.connectionsArray[0].mockRespond(createResponse({sideNav}));
+    });
+
+    it('should have the supplied tooltip', () => {
+      expect(view[0].tooltip).toEqual('a tip');
+    });
+
+    it('should create a tooltip from title + period', () => {
+      expect(view[1].tooltip).toEqual('b.');
+    });
+
+    it('should create a tooltip from title, keeping its trailing punctuation', () => {
+      expect(view[2].tooltip).toEqual('c!');
+    });
+
+    it('should not create a tooltip if there is no title', () => {
+      expect(view[3].tooltip).toBeUndefined();
+    });
+  });
+
   describe('currentNode', () => {
     let currentNode: CurrentNode;
     let locationService: MockLocationService;
 
-    const topBarNodes: NavigationNode[] = [{ url: 'features', title: 'Features' }];
+    const topBarNodes: NavigationNode[] = [
+      { url: 'features', title: 'Features', tooltip: 'tip' }
+    ];
     const sideNavNodes: NavigationNode[] = [
-        { title: 'a', children: [
-          { url: 'b', title: 'b', children: [
-            { url: 'c', title: 'c' },
-            { url: 'd', title: 'd' }
+        { title: 'a', tooltip: 'tip', children: [
+          { url: 'b', title: 'b', tooltip: 'tip', children: [
+            { url: 'c', title: 'c', tooltip: 'tip' },
+            { url: 'd', title: 'd', tooltip: 'tip' }
           ] },
-          { url: 'e', title: 'e' }
+          { url: 'e', title: 'e', tooltip: 'tip' }
         ] },
-        { url: 'f', title: 'f' }
+        { url: 'f', title: 'f', tooltip: 'tip' }
       ];
 
     const navJson = {
@@ -199,6 +233,7 @@ describe('NavigationService', () => {
   describe('docVersions', () => {
     let actualDocVersions: NavigationNode[];
     let docVersions: NavigationNode[];
+    let expectedDocVersions: NavigationNode[];
 
     beforeEach(() => {
       actualDocVersions = [];
@@ -207,12 +242,16 @@ describe('NavigationService', () => {
         { title: 'v2', url: 'https://v2.angular.io' }
       ];
 
+      expectedDocVersions = docVersions.map(v => (
+        {...v, ...{ tooltip: v.title + '.'}})
+      );
+
       navService.navigationViews.subscribe(views => actualDocVersions = views.docVersions);
     });
 
     it('should extract the docVersions', () => {
       backend.connectionsArray[0].mockRespond(createResponse({ docVersions }));
-      expect(actualDocVersions).toEqual(docVersions);
+      expect(actualDocVersions).toEqual(expectedDocVersions);
     });
   });
 });

aio/src/app/navigation/navigation.service.ts

@@ -90,7 +90,7 @@ export class NavigationService {
    */
   private getCurrentNode(navigationViews: Observable<NavigationViews>): Observable<CurrentNode> {
     const currentNode = combineLatest(
-      navigationViews.map(this.computeUrlToNavNodesMap),
+      navigationViews.map(views => this.computeUrlToNavNodesMap(views)),
       this.location.currentPath,
       (navMap, url) => {
         const urlKey = url.startsWith('api/') ? 'api' : url;
@@ -110,21 +110,42 @@ export class NavigationService {
   private computeUrlToNavNodesMap(navigation: NavigationViews) {
     const navMap = new Map<string, CurrentNode>();
     Object.keys(navigation)
-      .forEach(view => navigation[view].forEach(node => walkNodes(view, node)));
+      .forEach(view => navigation[view]
+        .forEach(node => this.walkNodes(view, navMap, node)));
     return navMap;
+  }
 
-    function walkNodes(view: string, node: NavigationNode, ancestors: NavigationNode[] = []) {
+  /**
+   * Add tooltip to node if it doesn't have one and have title.
+   * If don't want tooltip, specify `"tooltip": ""` in navigation.json
+   */
+  private ensureHasTooltip(node: NavigationNode) {
+    const title = node.title;
+    const tooltip = node.tooltip;
+    if (tooltip == null && title ) {
+      // add period if no trailing punctuation
+      node.tooltip = title + (/[a-zA-Z0-9]$/.test(title) ? '.' : '');
+    }
+  }
+  /**
+   * Walk the nodes of a navigation tree-view,
+   * patching them and computing their ancestor nodes
+   */
+  private walkNodes(
+    view: string, navMap: Map<string, CurrentNode>,
+    node: NavigationNode, ancestors: NavigationNode[] = []) {
       const nodes = [node, ...ancestors];
       const url = node.url;
+      this.ensureHasTooltip(node);
 
-      // only map to this node if it has a url associated with it
+      // only map to this node if it has a url
       if (url) {
         // Strip off trailing slashes from nodes in the navMap - they are not relevant to matching
         navMap[url.replace(/\/$/, '')] = { url, view, nodes };
       }
+
       if (node.children) {
-        node.children.forEach(child => walkNodes(view, child, nodes));
-      }
+        node.children.forEach(child => this.walkNodes(view, navMap, child, nodes));
       }
     }
 }