/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { ɵRuntimeError as RuntimeError } from '@angular/core';
import { from, of, throwError } from 'rxjs';
import { catchError, concatMap, first, last, map, mergeMap, scan, switchMap, tap } from 'rxjs/operators';
import { navigationCancelingError } from './navigation_canceling_error';
import { runCanLoadGuards } from './operators/check_guards';
import { PRIMARY_OUTLET } from './shared';
import { createRoot, squashSegmentGroup, UrlSegmentGroup, UrlTree } from './url_tree';
import { forEach } from './utils/collection';
import { getOrCreateRouteInjectorIfNeeded, getOutlet, sortByMatchingOutlets } from './utils/config';
import { isImmediateMatch, match, matchWithChecks, noLeftoversInUrl, split } from './utils/config_matching';
import { isEmptyError } from './utils/type_guards';
const NG_DEV_MODE = typeof ngDevMode === 'undefined' || ngDevMode;
class NoMatch {
    constructor(segmentGroup) {
        this.segmentGroup = segmentGroup || null;
    }
}
class AbsoluteRedirect {
    constructor(urlTree) {
        this.urlTree = urlTree;
    }
}
function noMatch(segmentGroup) {
    return throwError(new NoMatch(segmentGroup));
}
function absoluteRedirect(newTree) {
    return throwError(new AbsoluteRedirect(newTree));
}
function namedOutletsRedirect(redirectTo) {
    return throwError(new RuntimeError(4000 /* RuntimeErrorCode.NAMED_OUTLET_REDIRECT */, NG_DEV_MODE &&
        `Only absolute redirects can have named outlets. redirectTo: '${redirectTo}'`));
}
function canLoadFails(route) {
    return throwError(navigationCancelingError(NG_DEV_MODE &&
        `Cannot load children because the guard of the route "path: '${route.path}'" returned false`, 3 /* NavigationCancellationCode.GuardRejected */));
}
/**
 * Returns the `UrlTree` with the redirection applied.
 *
 * Lazy modules are loaded along the way.
 */
export function applyRedirects(injector, configLoader, urlSerializer, urlTree, config) {
    return new ApplyRedirects(injector, configLoader, urlSerializer, urlTree, config).apply();
}
class ApplyRedirects {
    constructor(injector, configLoader, urlSerializer, urlTree, config) {
        this.injector = injector;
        this.configLoader = configLoader;
        this.urlSerializer = urlSerializer;
        this.urlTree = urlTree;
        this.config = config;
        this.allowRedirects = true;
    }
    apply() {
        const splitGroup = split(this.urlTree.root, [], [], this.config).segmentGroup;
        // TODO(atscott): creating a new segment removes the _sourceSegment _segmentIndexShift, which is
        // only necessary to prevent failures in tests which assert exact object matches. The `split` is
        // now shared between `applyRedirects` and `recognize` but only the `recognize` step needs these
        // properties. Before the implementations were merged, the `applyRedirects` would not assign
        // them. We should be able to remove this logic as a "breaking change" but should do some more
        // investigation into the failures first.
        const rootSegmentGroup = new UrlSegmentGroup(splitGroup.segments, splitGroup.children);
        const expanded$ = this.expandSegmentGroup(this.injector, this.config, rootSegmentGroup, PRIMARY_OUTLET);
        const urlTrees$ = expanded$.pipe(map((rootSegmentGroup) => {
            return this.createUrlTree(squashSegmentGroup(rootSegmentGroup), this.urlTree.queryParams, this.urlTree.fragment);
        }));
        return urlTrees$.pipe(catchError((e) => {
            if (e instanceof AbsoluteRedirect) {
                // After an absolute redirect we do not apply any more redirects!
                // If this implementation changes, update the documentation note in `redirectTo`.
                this.allowRedirects = false;
                // we need to run matching, so we can fetch all lazy-loaded modules
                return this.match(e.urlTree);
            }
            if (e instanceof NoMatch) {
                throw this.noMatchError(e);
            }
            throw e;
        }));
    }
    match(tree) {
        const expanded$ = this.expandSegmentGroup(this.injector, this.config, tree.root, PRIMARY_OUTLET);
        const mapped$ = expanded$.pipe(map((rootSegmentGroup) => {
            return this.createUrlTree(squashSegmentGroup(rootSegmentGroup), tree.queryParams, tree.fragment);
        }));
        return mapped$.pipe(catchError((e) => {
            if (e instanceof NoMatch) {
                throw this.noMatchError(e);
            }
            throw e;
        }));
    }
    noMatchError(e) {
        return new RuntimeError(4002 /* RuntimeErrorCode.NO_MATCH */, NG_DEV_MODE && `Cannot match any routes. URL Segment: '${e.segmentGroup}'`);
    }
    createUrlTree(rootCandidate, queryParams, fragment) {
        const root = createRoot(rootCandidate);
        return new UrlTree(root, queryParams, fragment);
    }
    expandSegmentGroup(injector, routes, segmentGroup, outlet) {
        if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {
            return this.expandChildren(injector, routes, segmentGroup)
                .pipe(map((children) => new UrlSegmentGroup([], children)));
        }
        return this.expandSegment(injector, segmentGroup, routes, segmentGroup.segments, outlet, true);
    }
    // Recursively expand segment groups for all the child outlets
    expandChildren(injector, routes, segmentGroup) {
        // Expand outlets one at a time, starting with the primary outlet. We need to do it this way
        // because an absolute redirect from the primary outlet takes precedence.
        const childOutlets = [];
        for (const child of Object.keys(segmentGroup.children)) {
            if (child === 'primary') {
                childOutlets.unshift(child);
            }
            else {
                childOutlets.push(child);
            }
        }
        return from(childOutlets)
            .pipe(concatMap(childOutlet => {
            const child = segmentGroup.children[childOutlet];
            // Sort the routes so routes with outlets that match the segment appear
            // first, followed by routes for other outlets, which might match if they have an
            // empty path.
            const sortedRoutes = sortByMatchingOutlets(routes, childOutlet);
            return this.expandSegmentGroup(injector, sortedRoutes, child, childOutlet)
                .pipe(map(s => ({ segment: s, outlet: childOutlet })));
        }), scan((children, expandedChild) => {
            children[expandedChild.outlet] = expandedChild.segment;
            return children;
        }, {}), last());
    }
    expandSegment(injector, segmentGroup, routes, segments, outlet, allowRedirects) {
        return from(routes).pipe(concatMap(r => {
            const expanded$ = this.expandSegmentAgainstRoute(injector, segmentGroup, routes, r, segments, outlet, allowRedirects);
            return expanded$.pipe(catchError((e) => {
                if (e instanceof NoMatch) {
                    return of(null);
                }
                throw e;
            }));
        }), first((s) => !!s), catchError((e, _) => {
            if (isEmptyError(e)) {
                if (noLeftoversInUrl(segmentGroup, segments, outlet)) {
                    return of(new UrlSegmentGroup([], {}));
                }
                return noMatch(segmentGroup);
            }
            throw e;
        }));
    }
    expandSegmentAgainstRoute(injector, segmentGroup, routes, route, paths, outlet, allowRedirects) {
        if (!isImmediateMatch(route, segmentGroup, paths, outlet)) {
            return noMatch(segmentGroup);
        }
        if (route.redirectTo === undefined) {
            return this.matchSegmentAgainstRoute(injector, segmentGroup, route, paths, outlet);
        }
        if (allowRedirects && this.allowRedirects) {
            return this.expandSegmentAgainstRouteUsingRedirect(injector, segmentGroup, routes, route, paths, outlet);
        }
        return noMatch(segmentGroup);
    }
    expandSegmentAgainstRouteUsingRedirect(injector, segmentGroup, routes, route, segments, outlet) {
        if (route.path === '**') {
            return this.expandWildCardWithParamsAgainstRouteUsingRedirect(injector, routes, route, outlet);
        }
        return this.expandRegularSegmentAgainstRouteUsingRedirect(injector, segmentGroup, routes, route, segments, outlet);
    }
    expandWildCardWithParamsAgainstRouteUsingRedirect(injector, routes, route, outlet) {
        const newTree = this.applyRedirectCommands([], route.redirectTo, {});
        if (route.redirectTo.startsWith('/')) {
            return absoluteRedirect(newTree);
        }
        return this.lineralizeSegments(route, newTree).pipe(mergeMap((newSegments) => {
            const group = new UrlSegmentGroup(newSegments, {});
            return this.expandSegment(injector, group, routes, newSegments, outlet, false);
        }));
    }
    expandRegularSegmentAgainstRouteUsingRedirect(injector, segmentGroup, routes, route, segments, outlet) {
        const { matched, consumedSegments, remainingSegments, positionalParamSegments } = match(segmentGroup, route, segments);
        if (!matched)
            return noMatch(segmentGroup);
        const newTree = this.applyRedirectCommands(consumedSegments, route.redirectTo, positionalParamSegments);
        if (route.redirectTo.startsWith('/')) {
            return absoluteRedirect(newTree);
        }
        return this.lineralizeSegments(route, newTree).pipe(mergeMap((newSegments) => {
            return this.expandSegment(injector, segmentGroup, routes, newSegments.concat(remainingSegments), outlet, false);
        }));
    }
    matchSegmentAgainstRoute(injector, rawSegmentGroup, route, segments, outlet) {
        if (route.path === '**') {
            // Only create the Route's `EnvironmentInjector` if it matches the attempted navigation
            injector = getOrCreateRouteInjectorIfNeeded(route, injector);
            if (route.loadChildren) {
                const loaded$ = route._loadedRoutes ?
                    of({ routes: route._loadedRoutes, injector: route._loadedInjector }) :
                    this.configLoader.loadChildren(injector, route);
                return loaded$.pipe(map((cfg) => {
                    route._loadedRoutes = cfg.routes;
                    route._loadedInjector = cfg.injector;
                    return new UrlSegmentGroup(segments, {});
                }));
            }
            return of(new UrlSegmentGroup(segments, {}));
        }
        return matchWithChecks(rawSegmentGroup, route, segments, injector, this.urlSerializer)
            .pipe(switchMap(({ matched, consumedSegments, remainingSegments }) => {
            if (!matched)
                return noMatch(rawSegmentGroup);
            // If the route has an injector created from providers, we should start using that.
            injector = route._injector ?? injector;
            const childConfig$ = this.getChildConfig(injector, route, segments);
            return childConfig$.pipe(mergeMap((routerConfig) => {
                const childInjector = routerConfig.injector ?? injector;
                const childConfig = routerConfig.routes;
                const { segmentGroup: splitSegmentGroup, slicedSegments } = split(rawSegmentGroup, consumedSegments, remainingSegments, childConfig);
                // See comment on the other call to `split` about why this is necessary.
                const segmentGroup = new UrlSegmentGroup(splitSegmentGroup.segments, splitSegmentGroup.children);
                if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {
                    const expanded$ = this.expandChildren(childInjector, childConfig, segmentGroup);
                    return expanded$.pipe(map((children) => new UrlSegmentGroup(consumedSegments, children)));
                }
                if (childConfig.length === 0 && slicedSegments.length === 0) {
                    return of(new UrlSegmentGroup(consumedSegments, {}));
                }
                const matchedOnOutlet = getOutlet(route) === outlet;
                const expanded$ = this.expandSegment(childInjector, segmentGroup, childConfig, slicedSegments, matchedOnOutlet ? PRIMARY_OUTLET : outlet, true);
                return expanded$.pipe(map((cs) => new UrlSegmentGroup(consumedSegments.concat(cs.segments), cs.children)));
            }));
        }));
    }
    getChildConfig(injector, route, segments) {
        if (route.children) {
            // The children belong to the same module
            return of({ routes: route.children, injector });
        }
        if (route.loadChildren) {
            // lazy children belong to the loaded module
            if (route._loadedRoutes !== undefined) {
                return of({ routes: route._loadedRoutes, injector: route._loadedInjector });
            }
            return runCanLoadGuards(injector, route, segments, this.urlSerializer)
                .pipe(mergeMap((shouldLoadResult) => {
                if (shouldLoadResult) {
                    return this.configLoader.loadChildren(injector, route)
                        .pipe(tap((cfg) => {
                        route._loadedRoutes = cfg.routes;
                        route._loadedInjector = cfg.injector;
                    }));
                }
                return canLoadFails(route);
            }));
        }
        return of({ routes: [], injector });
    }
    lineralizeSegments(route, urlTree) {
        let res = [];
        let c = urlTree.root;
        while (true) {
            res = res.concat(c.segments);
            if (c.numberOfChildren === 0) {
                return of(res);
            }
            if (c.numberOfChildren > 1 || !c.children[PRIMARY_OUTLET]) {
                return namedOutletsRedirect(route.redirectTo);
            }
            c = c.children[PRIMARY_OUTLET];
        }
    }
    applyRedirectCommands(segments, redirectTo, posParams) {
        return this.applyRedirectCreateUrlTree(redirectTo, this.urlSerializer.parse(redirectTo), segments, posParams);
    }
    applyRedirectCreateUrlTree(redirectTo, urlTree, segments, posParams) {
        const newRoot = this.createSegmentGroup(redirectTo, urlTree.root, segments, posParams);
        return new UrlTree(newRoot, this.createQueryParams(urlTree.queryParams, this.urlTree.queryParams), urlTree.fragment);
    }
    createQueryParams(redirectToParams, actualParams) {
        const res = {};
        forEach(redirectToParams, (v, k) => {
            const copySourceValue = typeof v === 'string' && v.startsWith(':');
            if (copySourceValue) {
                const sourceName = v.substring(1);
                res[k] = actualParams[sourceName];
            }
            else {
                res[k] = v;
            }
        });
        return res;
    }
    createSegmentGroup(redirectTo, group, segments, posParams) {
        const updatedSegments = this.createSegments(redirectTo, group.segments, segments, posParams);
        let children = {};
        forEach(group.children, (child, name) => {
            children[name] = this.createSegmentGroup(redirectTo, child, segments, posParams);
        });
        return new UrlSegmentGroup(updatedSegments, children);
    }
    createSegments(redirectTo, redirectToSegments, actualSegments, posParams) {
        return redirectToSegments.map(s => s.path.startsWith(':') ? this.findPosParam(redirectTo, s, posParams) :
            this.findOrReturn(s, actualSegments));
    }
    findPosParam(redirectTo, redirectToUrlSegment, posParams) {
        const pos = posParams[redirectToUrlSegment.path.substring(1)];
        if (!pos)
            throw new RuntimeError(4001 /* RuntimeErrorCode.MISSING_REDIRECT */, NG_DEV_MODE &&
                `Cannot redirect to '${redirectTo}'. Cannot find '${redirectToUrlSegment.path}'.`);
        return pos;
    }
    findOrReturn(redirectToUrlSegment, actualSegments) {
        let idx = 0;
        for (const s of actualSegments) {
            if (s.path === redirectToUrlSegment.path) {
                actualSegments.splice(idx);
                return s;
            }
            idx++;
        }
        return redirectToUrlSegment;
    }
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {EnvironmentInjector, ɵRuntimeError as RuntimeError} from '@angular/core';\nimport {from, Observable, of, throwError} from 'rxjs';\nimport {catchError, concatMap, first, last, map, mergeMap, scan, switchMap, tap} from 'rxjs/operators';\n\nimport {RuntimeErrorCode} from './errors';\nimport {NavigationCancellationCode} from './events';\nimport {LoadedRouterConfig, Route, Routes} from './models';\nimport {navigationCancelingError} from './navigation_canceling_error';\nimport {runCanLoadGuards} from './operators/check_guards';\nimport {RouterConfigLoader} from './router_config_loader';\nimport {Params, PRIMARY_OUTLET} from './shared';\nimport {createRoot, squashSegmentGroup, UrlSegment, UrlSegmentGroup, UrlSerializer, UrlTree} from './url_tree';\nimport {forEach} from './utils/collection';\nimport {getOrCreateRouteInjectorIfNeeded, getOutlet, sortByMatchingOutlets} from './utils/config';\nimport {isImmediateMatch, match, matchWithChecks, noLeftoversInUrl, split} from './utils/config_matching';\nimport {isEmptyError} from './utils/type_guards';\n\nconst NG_DEV_MODE = typeof ngDevMode === 'undefined' || ngDevMode;\n\nclass NoMatch {\n  public segmentGroup: UrlSegmentGroup|null;\n\n  constructor(segmentGroup?: UrlSegmentGroup) {\n    this.segmentGroup = segmentGroup || null;\n  }\n}\n\nclass AbsoluteRedirect {\n  constructor(public urlTree: UrlTree) {}\n}\n\nfunction noMatch(segmentGroup: UrlSegmentGroup): Observable<UrlSegmentGroup> {\n  return throwError(new NoMatch(segmentGroup));\n}\n\nfunction absoluteRedirect(newTree: UrlTree): Observable<any> {\n  return throwError(new AbsoluteRedirect(newTree));\n}\n\nfunction namedOutletsRedirect(redirectTo: string): Observable<any> {\n  return throwError(new RuntimeError(\n      RuntimeErrorCode.NAMED_OUTLET_REDIRECT,\n      NG_DEV_MODE &&\n          `Only absolute redirects can have named outlets. redirectTo: '${redirectTo}'`));\n}\n\nfunction canLoadFails(route: Route): Observable<LoadedRouterConfig> {\n  return throwError(navigationCancelingError(\n      NG_DEV_MODE &&\n          `Cannot load children because the guard of the route \"path: '${\n              route.path}'\" returned false`,\n      NavigationCancellationCode.GuardRejected));\n}\n\n/**\n * Returns the `UrlTree` with the redirection applied.\n *\n * Lazy modules are loaded along the way.\n */\nexport function applyRedirects(\n    injector: EnvironmentInjector, configLoader: RouterConfigLoader, urlSerializer: UrlSerializer,\n    urlTree: UrlTree, config: Routes): Observable<UrlTree> {\n  return new ApplyRedirects(injector, configLoader, urlSerializer, urlTree, config).apply();\n}\n\nclass ApplyRedirects {\n  private allowRedirects: boolean = true;\n\n  constructor(\n      private injector: EnvironmentInjector, private configLoader: RouterConfigLoader,\n      private urlSerializer: UrlSerializer, private urlTree: UrlTree, private config: Routes) {}\n\n  apply(): Observable<UrlTree> {\n    const splitGroup = split(this.urlTree.root, [], [], this.config).segmentGroup;\n    // TODO(atscott): creating a new segment removes the _sourceSegment _segmentIndexShift, which is\n    // only necessary to prevent failures in tests which assert exact object matches. The `split` is\n    // now shared between `applyRedirects` and `recognize` but only the `recognize` step needs these\n    // properties. Before the implementations were merged, the `applyRedirects` would not assign\n    // them. We should be able to remove this logic as a \"breaking change\" but should do some more\n    // investigation into the failures first.\n    const rootSegmentGroup = new UrlSegmentGroup(splitGroup.segments, splitGroup.children);\n\n    const expanded$ =\n        this.expandSegmentGroup(this.injector, this.config, rootSegmentGroup, PRIMARY_OUTLET);\n    const urlTrees$ = expanded$.pipe(map((rootSegmentGroup: UrlSegmentGroup) => {\n      return this.createUrlTree(\n          squashSegmentGroup(rootSegmentGroup), this.urlTree.queryParams, this.urlTree.fragment);\n    }));\n    return urlTrees$.pipe(catchError((e: any) => {\n      if (e instanceof AbsoluteRedirect) {\n        // After an absolute redirect we do not apply any more redirects!\n        // If this implementation changes, update the documentation note in `redirectTo`.\n        this.allowRedirects = false;\n        // we need to run matching, so we can fetch all lazy-loaded modules\n        return this.match(e.urlTree);\n      }\n\n      if (e instanceof NoMatch) {\n        throw this.noMatchError(e);\n      }\n\n      throw e;\n    }));\n  }\n\n  private match(tree: UrlTree): Observable<UrlTree> {\n    const expanded$ =\n        this.expandSegmentGroup(this.injector, this.config, tree.root, PRIMARY_OUTLET);\n    const mapped$ = expanded$.pipe(map((rootSegmentGroup: UrlSegmentGroup) => {\n      return this.createUrlTree(\n          squashSegmentGroup(rootSegmentGroup), tree.queryParams, tree.fragment);\n    }));\n    return mapped$.pipe(catchError((e: any): Observable<UrlTree> => {\n      if (e instanceof NoMatch) {\n        throw this.noMatchError(e);\n      }\n\n      throw e;\n    }));\n  }\n\n  private noMatchError(e: NoMatch): any {\n    return new RuntimeError(\n        RuntimeErrorCode.NO_MATCH,\n        NG_DEV_MODE && `Cannot match any routes. URL Segment: '${e.segmentGroup}'`);\n  }\n\n  private createUrlTree(rootCandidate: UrlSegmentGroup, queryParams: Params, fragment: string|null):\n      UrlTree {\n    const root = createRoot(rootCandidate);\n    return new UrlTree(root, queryParams, fragment);\n  }\n\n  private expandSegmentGroup(\n      injector: EnvironmentInjector, routes: Route[], segmentGroup: UrlSegmentGroup,\n      outlet: string): Observable<UrlSegmentGroup> {\n    if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {\n      return this.expandChildren(injector, routes, segmentGroup)\n          .pipe(map((children: any) => new UrlSegmentGroup([], children)));\n    }\n\n    return this.expandSegment(injector, segmentGroup, routes, segmentGroup.segments, outlet, true);\n  }\n\n  // Recursively expand segment groups for all the child outlets\n  private expandChildren(\n      injector: EnvironmentInjector, routes: Route[],\n      segmentGroup: UrlSegmentGroup): Observable<{[name: string]: UrlSegmentGroup}> {\n    // Expand outlets one at a time, starting with the primary outlet. We need to do it this way\n    // because an absolute redirect from the primary outlet takes precedence.\n    const childOutlets: string[] = [];\n    for (const child of Object.keys(segmentGroup.children)) {\n      if (child === 'primary') {\n        childOutlets.unshift(child);\n      } else {\n        childOutlets.push(child);\n      }\n    }\n\n    return from(childOutlets)\n        .pipe(\n            concatMap(childOutlet => {\n              const child = segmentGroup.children[childOutlet];\n              // Sort the routes so routes with outlets that match the segment appear\n              // first, followed by routes for other outlets, which might match if they have an\n              // empty path.\n              const sortedRoutes = sortByMatchingOutlets(routes, childOutlet);\n              return this.expandSegmentGroup(injector, sortedRoutes, child, childOutlet)\n                  .pipe(map(s => ({segment: s, outlet: childOutlet})));\n            }),\n            scan(\n                (children, expandedChild) => {\n                  children[expandedChild.outlet] = expandedChild.segment;\n                  return children;\n                },\n                {} as {[outlet: string]: UrlSegmentGroup}),\n            last(),\n        );\n  }\n\n  private expandSegment(\n      injector: EnvironmentInjector, segmentGroup: UrlSegmentGroup, routes: Route[],\n      segments: UrlSegment[], outlet: string,\n      allowRedirects: boolean): Observable<UrlSegmentGroup> {\n    return from(routes).pipe(\n        concatMap(r => {\n          const expanded$ = this.expandSegmentAgainstRoute(\n              injector, segmentGroup, routes, r, segments, outlet, allowRedirects);\n          return expanded$.pipe(catchError((e: any) => {\n            if (e instanceof NoMatch) {\n              return of(null);\n            }\n            throw e;\n          }));\n        }),\n        first((s): s is UrlSegmentGroup => !!s), catchError((e: any, _: any) => {\n          if (isEmptyError(e)) {\n            if (noLeftoversInUrl(segmentGroup, segments, outlet)) {\n              return of(new UrlSegmentGroup([], {}));\n            }\n            return noMatch(segmentGroup);\n          }\n          throw e;\n        }));\n  }\n\n  private expandSegmentAgainstRoute(\n      injector: EnvironmentInjector, segmentGroup: UrlSegmentGroup, routes: Route[], route: Route,\n      paths: UrlSegment[], outlet: string, allowRedirects: boolean): Observable<UrlSegmentGroup> {\n    if (!isImmediateMatch(route, segmentGroup, paths, outlet)) {\n      return noMatch(segmentGroup);\n    }\n\n    if (route.redirectTo === undefined) {\n      return this.matchSegmentAgainstRoute(injector, segmentGroup, route, paths, outlet);\n    }\n\n    if (allowRedirects && this.allowRedirects) {\n      return this.expandSegmentAgainstRouteUsingRedirect(\n          injector, segmentGroup, routes, route, paths, outlet);\n    }\n\n    return noMatch(segmentGroup);\n  }\n\n  private expandSegmentAgainstRouteUsingRedirect(\n      injector: EnvironmentInjector, segmentGroup: UrlSegmentGroup, routes: Route[], route: Route,\n      segments: UrlSegment[], outlet: string): Observable<UrlSegmentGroup> {\n    if (route.path === '**') {\n      return this.expandWildCardWithParamsAgainstRouteUsingRedirect(\n          injector, routes, route, outlet);\n    }\n\n    return this.expandRegularSegmentAgainstRouteUsingRedirect(\n        injector, segmentGroup, routes, route, segments, outlet);\n  }\n\n  private expandWildCardWithParamsAgainstRouteUsingRedirect(\n      injector: EnvironmentInjector, routes: Route[], route: Route,\n      outlet: string): Observable<UrlSegmentGroup> {\n    const newTree = this.applyRedirectCommands([], route.redirectTo!, {});\n    if (route.redirectTo!.startsWith('/')) {\n      return absoluteRedirect(newTree);\n    }\n\n    return this.lineralizeSegments(route, newTree).pipe(mergeMap((newSegments: UrlSegment[]) => {\n      const group = new UrlSegmentGroup(newSegments, {});\n      return this.expandSegment(injector, group, routes, newSegments, outlet, false);\n    }));\n  }\n\n  private expandRegularSegmentAgainstRouteUsingRedirect(\n      injector: EnvironmentInjector, segmentGroup: UrlSegmentGroup, routes: Route[], route: Route,\n      segments: UrlSegment[], outlet: string): Observable<UrlSegmentGroup> {\n    const {matched, consumedSegments, remainingSegments, positionalParamSegments} =\n        match(segmentGroup, route, segments);\n    if (!matched) return noMatch(segmentGroup);\n\n    const newTree =\n        this.applyRedirectCommands(consumedSegments, route.redirectTo!, positionalParamSegments);\n    if (route.redirectTo!.startsWith('/')) {\n      return absoluteRedirect(newTree);\n    }\n\n    return this.lineralizeSegments(route, newTree).pipe(mergeMap((newSegments: UrlSegment[]) => {\n      return this.expandSegment(\n          injector, segmentGroup, routes, newSegments.concat(remainingSegments), outlet, false);\n    }));\n  }\n\n  private matchSegmentAgainstRoute(\n      injector: EnvironmentInjector, rawSegmentGroup: UrlSegmentGroup, route: Route,\n      segments: UrlSegment[], outlet: string): Observable<UrlSegmentGroup> {\n    if (route.path === '**') {\n      // Only create the Route's `EnvironmentInjector` if it matches the attempted navigation\n      injector = getOrCreateRouteInjectorIfNeeded(route, injector);\n      if (route.loadChildren) {\n        const loaded$ = route._loadedRoutes ?\n            of({routes: route._loadedRoutes, injector: route._loadedInjector}) :\n            this.configLoader.loadChildren(injector, route);\n        return loaded$.pipe(map((cfg: LoadedRouterConfig) => {\n          route._loadedRoutes = cfg.routes;\n          route._loadedInjector = cfg.injector;\n          return new UrlSegmentGroup(segments, {});\n        }));\n      }\n\n      return of(new UrlSegmentGroup(segments, {}));\n    }\n\n    return matchWithChecks(rawSegmentGroup, route, segments, injector, this.urlSerializer)\n        .pipe(\n            switchMap(({matched, consumedSegments, remainingSegments}) => {\n              if (!matched) return noMatch(rawSegmentGroup);\n\n              // If the route has an injector created from providers, we should start using that.\n              injector = route._injector ?? injector;\n              const childConfig$ = this.getChildConfig(injector, route, segments);\n\n              return childConfig$.pipe(mergeMap((routerConfig: LoadedRouterConfig) => {\n                const childInjector = routerConfig.injector ?? injector;\n                const childConfig = routerConfig.routes;\n\n                const {segmentGroup: splitSegmentGroup, slicedSegments} =\n                    split(rawSegmentGroup, consumedSegments, remainingSegments, childConfig);\n                // See comment on the other call to `split` about why this is necessary.\n                const segmentGroup =\n                    new UrlSegmentGroup(splitSegmentGroup.segments, splitSegmentGroup.children);\n\n                if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {\n                  const expanded$ = this.expandChildren(childInjector, childConfig, segmentGroup);\n                  return expanded$.pipe(\n                      map((children: any) => new UrlSegmentGroup(consumedSegments, children)));\n                }\n\n                if (childConfig.length === 0 && slicedSegments.length === 0) {\n                  return of(new UrlSegmentGroup(consumedSegments, {}));\n                }\n\n                const matchedOnOutlet = getOutlet(route) === outlet;\n                const expanded$ = this.expandSegment(\n                    childInjector, segmentGroup, childConfig, slicedSegments,\n                    matchedOnOutlet ? PRIMARY_OUTLET : outlet, true);\n                return expanded$.pipe(\n                    map((cs: UrlSegmentGroup) => new UrlSegmentGroup(\n                            consumedSegments.concat(cs.segments), cs.children)));\n              }));\n            }),\n        );\n  }\n\n  private getChildConfig(injector: EnvironmentInjector, route: Route, segments: UrlSegment[]):\n      Observable<LoadedRouterConfig> {\n    if (route.children) {\n      // The children belong to the same module\n      return of({routes: route.children, injector});\n    }\n\n    if (route.loadChildren) {\n      // lazy children belong to the loaded module\n      if (route._loadedRoutes !== undefined) {\n        return of({routes: route._loadedRoutes, injector: route._loadedInjector});\n      }\n\n      return runCanLoadGuards(injector, route, segments, this.urlSerializer)\n          .pipe(mergeMap((shouldLoadResult: boolean) => {\n            if (shouldLoadResult) {\n              return this.configLoader.loadChildren(injector, route)\n                  .pipe(tap((cfg: LoadedRouterConfig) => {\n                    route._loadedRoutes = cfg.routes;\n                    route._loadedInjector = cfg.injector;\n                  }));\n            }\n            return canLoadFails(route);\n          }));\n    }\n\n    return of({routes: [], injector});\n  }\n\n  private lineralizeSegments(route: Route, urlTree: UrlTree): Observable<UrlSegment[]> {\n    let res: UrlSegment[] = [];\n    let c = urlTree.root;\n    while (true) {\n      res = res.concat(c.segments);\n      if (c.numberOfChildren === 0) {\n        return of(res);\n      }\n\n      if (c.numberOfChildren > 1 || !c.children[PRIMARY_OUTLET]) {\n        return namedOutletsRedirect(route.redirectTo!);\n      }\n\n      c = c.children[PRIMARY_OUTLET];\n    }\n  }\n\n  private applyRedirectCommands(\n      segments: UrlSegment[], redirectTo: string, posParams: {[k: string]: UrlSegment}): UrlTree {\n    return this.applyRedirectCreateUrlTree(\n        redirectTo, this.urlSerializer.parse(redirectTo), segments, posParams);\n  }\n\n  private applyRedirectCreateUrlTree(\n      redirectTo: string, urlTree: UrlTree, segments: UrlSegment[],\n      posParams: {[k: string]: UrlSegment}): UrlTree {\n    const newRoot = this.createSegmentGroup(redirectTo, urlTree.root, segments, posParams);\n    return new UrlTree(\n        newRoot, this.createQueryParams(urlTree.queryParams, this.urlTree.queryParams),\n        urlTree.fragment);\n  }\n\n  private createQueryParams(redirectToParams: Params, actualParams: Params): Params {\n    const res: Params = {};\n    forEach(redirectToParams, (v: any, k: string) => {\n      const copySourceValue = typeof v === 'string' && v.startsWith(':');\n      if (copySourceValue) {\n        const sourceName = v.substring(1);\n        res[k] = actualParams[sourceName];\n      } else {\n        res[k] = v;\n      }\n    });\n    return res;\n  }\n\n  private createSegmentGroup(\n      redirectTo: string, group: UrlSegmentGroup, segments: UrlSegment[],\n      posParams: {[k: string]: UrlSegment}): UrlSegmentGroup {\n    const updatedSegments = this.createSegments(redirectTo, group.segments, segments, posParams);\n\n    let children: {[n: string]: UrlSegmentGroup} = {};\n    forEach(group.children, (child: UrlSegmentGroup, name: string) => {\n      children[name] = this.createSegmentGroup(redirectTo, child, segments, posParams);\n    });\n\n    return new UrlSegmentGroup(updatedSegments, children);\n  }\n\n  private createSegments(\n      redirectTo: string, redirectToSegments: UrlSegment[], actualSegments: UrlSegment[],\n      posParams: {[k: string]: UrlSegment}): UrlSegment[] {\n    return redirectToSegments.map(\n        s => s.path.startsWith(':') ? this.findPosParam(redirectTo, s, posParams) :\n                                      this.findOrReturn(s, actualSegments));\n  }\n\n  private findPosParam(\n      redirectTo: string, redirectToUrlSegment: UrlSegment,\n      posParams: {[k: string]: UrlSegment}): UrlSegment {\n    const pos = posParams[redirectToUrlSegment.path.substring(1)];\n    if (!pos)\n      throw new RuntimeError(\n          RuntimeErrorCode.MISSING_REDIRECT,\n          NG_DEV_MODE &&\n              `Cannot redirect to '${redirectTo}'. Cannot find '${redirectToUrlSegment.path}'.`);\n    return pos;\n  }\n\n  private findOrReturn(redirectToUrlSegment: UrlSegment, actualSegments: UrlSegment[]): UrlSegment {\n    let idx = 0;\n    for (const s of actualSegments) {\n      if (s.path === redirectToUrlSegment.path) {\n        actualSegments.splice(idx);\n        return s;\n      }\n      idx++;\n    }\n    return redirectToUrlSegment;\n  }\n}\n"]}