76 lines
2.2 KiB
TypeScript
76 lines
2.2 KiB
TypeScript
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import { Injectable } from '@angular/core';
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import { Http } from '@angular/http';
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import { Observable } from 'rxjs/Observable';
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import { combineLatest } from 'rxjs/observable/combineLatest';
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import 'rxjs/add/operator/publish';
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import { Logger } from 'app/shared/logger.service';
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import { LocationService } from 'app/shared/location.service';
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export interface NavigationNode {
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url?: string;
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path?: string;
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title?: string;
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tooltip?: string;
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target?: string;
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children?: NavigationNode[];
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}
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export interface NavigationViews {
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[name: string]: NavigationNode;
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}
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export interface NavigationMap {
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[url: string]: NavigationMapItem;
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}
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export interface NavigationMapItem {
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node: NavigationNode;
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parents: NavigationNode[];
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}
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const NAVIGATION_PATH = 'content/navigation.json';
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@Injectable()
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export class NavigationService {
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navigationViews: Observable<NavigationViews>;
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currentNode: Observable<NavigationNode>;
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activeNodes: Observable<NavigationNode[]>;
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constructor(private http: Http, location: LocationService, private logger: Logger) {
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this.navigationViews = this.fetchNavigation();
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const currentMapItem = combineLatest(
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this.navigationViews.map(this.computeNavMap),
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location.currentUrl,
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(navMap, url) => navMap[url]);
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this.currentNode = currentMapItem.map(item => item.node).publish();
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this.activeNodes = currentMapItem.map(item => [item.node, ...item.parents]).publish();
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}
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private fetchNavigation(): Observable<NavigationViews> {
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// TODO: logging and error handling
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return this.http.get(NAVIGATION_PATH).map(res => res.json() as NavigationViews);
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}
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private computeNavMap(navigation: NavigationViews): NavigationMap {
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const navMap: NavigationMap = {};
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Object.keys(navigation).forEach(key => walk(navigation[key], null));
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return navMap;
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function walk(node: NavigationNode, parent: NavigationMapItem) {
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const item = { node, parents: [parent.node, ...parent.parents] };
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if (node.path) {
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// only map to this item if it has a doc associated with it
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navMap[node.path] = item;
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}
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if (node.children) {
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node.children.forEach(child => walk(child, item));
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}
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}
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}
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}
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