source: trip-planner-front/node_modules/@angular/router/esm2015/src/recognize.js

/**
 * @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 { Observable, of } from 'rxjs';
import { ActivatedRouteSnapshot, inheritedParamsDataResolve, RouterStateSnapshot } from './router_state';
import { PRIMARY_OUTLET } from './shared';
import { last } from './utils/collection';
import { getOutlet, sortByMatchingOutlets } from './utils/config';
import { isImmediateMatch, match, noLeftoversInUrl, split } from './utils/config_matching';
import { TreeNode } from './utils/tree';
class NoMatch {
}
function newObservableError(e) {
    // TODO(atscott): This pattern is used throughout the router code and can be `throwError` instead.
    return new Observable((obs) => obs.error(e));
}
export function recognize(rootComponentType, config, urlTree, url, paramsInheritanceStrategy = 'emptyOnly', relativeLinkResolution = 'legacy') {
    try {
        const result = new Recognizer(rootComponentType, config, urlTree, url, paramsInheritanceStrategy, relativeLinkResolution)
            .recognize();
        if (result === null) {
            return newObservableError(new NoMatch());
        }
        else {
            return of(result);
        }
    }
    catch (e) {
        // Catch the potential error from recognize due to duplicate outlet matches and return as an
        // `Observable` error instead.
        return newObservableError(e);
    }
}
export class Recognizer {
    constructor(rootComponentType, config, urlTree, url, paramsInheritanceStrategy, relativeLinkResolution) {
        this.rootComponentType = rootComponentType;
        this.config = config;
        this.urlTree = urlTree;
        this.url = url;
        this.paramsInheritanceStrategy = paramsInheritanceStrategy;
        this.relativeLinkResolution = relativeLinkResolution;
    }
    recognize() {
        const rootSegmentGroup = split(this.urlTree.root, [], [], this.config.filter(c => c.redirectTo === undefined), this.relativeLinkResolution)
            .segmentGroup;
        const children = this.processSegmentGroup(this.config, rootSegmentGroup, PRIMARY_OUTLET);
        if (children === null) {
            return null;
        }
        // Use Object.freeze to prevent readers of the Router state from modifying it outside of a
        // navigation, resulting in the router being out of sync with the browser.
        const root = new ActivatedRouteSnapshot([], Object.freeze({}), Object.freeze(Object.assign({}, this.urlTree.queryParams)), this.urlTree.fragment, {}, PRIMARY_OUTLET, this.rootComponentType, null, this.urlTree.root, -1, {});
        const rootNode = new TreeNode(root, children);
        const routeState = new RouterStateSnapshot(this.url, rootNode);
        this.inheritParamsAndData(routeState._root);
        return routeState;
    }
    inheritParamsAndData(routeNode) {
        const route = routeNode.value;
        const i = inheritedParamsDataResolve(route, this.paramsInheritanceStrategy);
        route.params = Object.freeze(i.params);
        route.data = Object.freeze(i.data);
        routeNode.children.forEach(n => this.inheritParamsAndData(n));
    }
    processSegmentGroup(config, segmentGroup, outlet) {
        if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {
            return this.processChildren(config, segmentGroup);
        }
        return this.processSegment(config, segmentGroup, segmentGroup.segments, outlet);
    }
    /**
     * Matches every child outlet in the `segmentGroup` to a `Route` in the config. Returns `null` if
     * we cannot find a match for _any_ of the children.
     *
     * @param config - The `Routes` to match against
     * @param segmentGroup - The `UrlSegmentGroup` whose children need to be matched against the
     *     config.
     */
    processChildren(config, segmentGroup) {
        const children = [];
        for (const childOutlet of Object.keys(segmentGroup.children)) {
            const child = segmentGroup.children[childOutlet];
            // Sort the config so that routes with outlets that match the one being activated appear
            // first, followed by routes for other outlets, which might match if they have an empty path.
            const sortedConfig = sortByMatchingOutlets(config, childOutlet);
            const outletChildren = this.processSegmentGroup(sortedConfig, child, childOutlet);
            if (outletChildren === null) {
                // Configs must match all segment children so because we did not find a match for this
                // outlet, return `null`.
                return null;
            }
            children.push(...outletChildren);
        }
        // Because we may have matched two outlets to the same empty path segment, we can have multiple
        // activated results for the same outlet. We should merge the children of these results so the
        // final return value is only one `TreeNode` per outlet.
        const mergedChildren = mergeEmptyPathMatches(children);
        if (typeof ngDevMode === 'undefined' || ngDevMode) {
            // This should really never happen - we are only taking the first match for each outlet and
            // merge the empty path matches.
            checkOutletNameUniqueness(mergedChildren);
        }
        sortActivatedRouteSnapshots(mergedChildren);
        return mergedChildren;
    }
    processSegment(config, segmentGroup, segments, outlet) {
        for (const r of config) {
            const children = this.processSegmentAgainstRoute(r, segmentGroup, segments, outlet);
            if (children !== null) {
                return children;
            }
        }
        if (noLeftoversInUrl(segmentGroup, segments, outlet)) {
            return [];
        }
        return null;
    }
    processSegmentAgainstRoute(route, rawSegment, segments, outlet) {
        if (route.redirectTo || !isImmediateMatch(route, rawSegment, segments, outlet))
            return null;
        let snapshot;
        let consumedSegments = [];
        let rawSlicedSegments = [];
        if (route.path === '**') {
            const params = segments.length > 0 ? last(segments).parameters : {};
            snapshot = new ActivatedRouteSnapshot(segments, params, Object.freeze(Object.assign({}, this.urlTree.queryParams)), this.urlTree.fragment, getData(route), getOutlet(route), route.component, route, getSourceSegmentGroup(rawSegment), getPathIndexShift(rawSegment) + segments.length, getResolve(route));
        }
        else {
            const result = match(rawSegment, route, segments);
            if (!result.matched) {
                return null;
            }
            consumedSegments = result.consumedSegments;
            rawSlicedSegments = segments.slice(result.lastChild);
            snapshot = new ActivatedRouteSnapshot(consumedSegments, result.parameters, Object.freeze(Object.assign({}, this.urlTree.queryParams)), this.urlTree.fragment, getData(route), getOutlet(route), route.component, route, getSourceSegmentGroup(rawSegment), getPathIndexShift(rawSegment) + consumedSegments.length, getResolve(route));
        }
        const childConfig = getChildConfig(route);
        const { segmentGroup, slicedSegments } = split(rawSegment, consumedSegments, rawSlicedSegments, 
        // Filter out routes with redirectTo because we are trying to create activated route
        // snapshots and don't handle redirects here. That should have been done in
        // `applyRedirects`.
        childConfig.filter(c => c.redirectTo === undefined), this.relativeLinkResolution);
        if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {
            const children = this.processChildren(childConfig, segmentGroup);
            if (children === null) {
                return null;
            }
            return [new TreeNode(snapshot, children)];
        }
        if (childConfig.length === 0 && slicedSegments.length === 0) {
            return [new TreeNode(snapshot, [])];
        }
        const matchedOnOutlet = getOutlet(route) === outlet;
        // If we matched a config due to empty path match on a different outlet, we need to continue
        // passing the current outlet for the segment rather than switch to PRIMARY.
        // Note that we switch to primary when we have a match because outlet configs look like this:
        // {path: 'a', outlet: 'a', children: [
        //  {path: 'b', component: B},
        //  {path: 'c', component: C},
        // ]}
        // Notice that the children of the named outlet are configured with the primary outlet
        const children = this.processSegment(childConfig, segmentGroup, slicedSegments, matchedOnOutlet ? PRIMARY_OUTLET : outlet);
        if (children === null) {
            return null;
        }
        return [new TreeNode(snapshot, children)];
    }
}
function sortActivatedRouteSnapshots(nodes) {
    nodes.sort((a, b) => {
        if (a.value.outlet === PRIMARY_OUTLET)
            return -1;
        if (b.value.outlet === PRIMARY_OUTLET)
            return 1;
        return a.value.outlet.localeCompare(b.value.outlet);
    });
}
function getChildConfig(route) {
    if (route.children) {
        return route.children;
    }
    if (route.loadChildren) {
        return route._loadedConfig.routes;
    }
    return [];
}
function hasEmptyPathConfig(node) {
    const config = node.value.routeConfig;
    return config && config.path === '' && config.redirectTo === undefined;
}
/**
 * Finds `TreeNode`s with matching empty path route configs and merges them into `TreeNode` with the
 * children from each duplicate. This is necessary because different outlets can match a single
 * empty path route config and the results need to then be merged.
 */
function mergeEmptyPathMatches(nodes) {
    const result = [];
    // The set of nodes which contain children that were merged from two duplicate empty path nodes.
    const mergedNodes = new Set();
    for (const node of nodes) {
        if (!hasEmptyPathConfig(node)) {
            result.push(node);
            continue;
        }
        const duplicateEmptyPathNode = result.find(resultNode => node.value.routeConfig === resultNode.value.routeConfig);
        if (duplicateEmptyPathNode !== undefined) {
            duplicateEmptyPathNode.children.push(...node.children);
            mergedNodes.add(duplicateEmptyPathNode);
        }
        else {
            result.push(node);
        }
    }
    // For each node which has children from multiple sources, we need to recompute a new `TreeNode`
    // by also merging those children. This is necessary when there are multiple empty path configs in
    // a row. Put another way: whenever we combine children of two nodes, we need to also check if any
    // of those children can be combined into a single node as well.
    for (const mergedNode of mergedNodes) {
        const mergedChildren = mergeEmptyPathMatches(mergedNode.children);
        result.push(new TreeNode(mergedNode.value, mergedChildren));
    }
    return result.filter(n => !mergedNodes.has(n));
}
function checkOutletNameUniqueness(nodes) {
    const names = {};
    nodes.forEach(n => {
        const routeWithSameOutletName = names[n.value.outlet];
        if (routeWithSameOutletName) {
            const p = routeWithSameOutletName.url.map(s => s.toString()).join('/');
            const c = n.value.url.map(s => s.toString()).join('/');
            throw new Error(`Two segments cannot have the same outlet name: '${p}' and '${c}'.`);
        }
        names[n.value.outlet] = n.value;
    });
}
function getSourceSegmentGroup(segmentGroup) {
    let s = segmentGroup;
    while (s._sourceSegment) {
        s = s._sourceSegment;
    }
    return s;
}
function getPathIndexShift(segmentGroup) {
    let s = segmentGroup;
    let res = (s._segmentIndexShift ? s._segmentIndexShift : 0);
    while (s._sourceSegment) {
        s = s._sourceSegment;
        res += (s._segmentIndexShift ? s._segmentIndexShift : 0);
    }
    return res - 1;
}
function getData(route) {
    return route.data || {};
}
function getResolve(route) {
    return route.resolve || {};
}
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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 {Type} from '@angular/core';\nimport {Observable, Observer, of} from 'rxjs';\n\nimport {Data, ResolveData, Route, Routes} from './config';\nimport {ActivatedRouteSnapshot, inheritedParamsDataResolve, ParamsInheritanceStrategy, RouterStateSnapshot} from './router_state';\nimport {PRIMARY_OUTLET} from './shared';\nimport {UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';\nimport {last} from './utils/collection';\nimport {getOutlet, sortByMatchingOutlets} from './utils/config';\nimport {isImmediateMatch, match, noLeftoversInUrl, split} from './utils/config_matching';\nimport {TreeNode} from './utils/tree';\n\nclass NoMatch {}\n\nfunction newObservableError(e: unknown): Observable<RouterStateSnapshot> {\n  // TODO(atscott): This pattern is used throughout the router code and can be `throwError` instead.\n  return new Observable<RouterStateSnapshot>((obs: Observer<RouterStateSnapshot>) => obs.error(e));\n}\n\nexport function recognize(\n    rootComponentType: Type<any>|null, config: Routes, urlTree: UrlTree, url: string,\n    paramsInheritanceStrategy: ParamsInheritanceStrategy = 'emptyOnly',\n    relativeLinkResolution: 'legacy'|'corrected' = 'legacy'): Observable<RouterStateSnapshot> {\n  try {\n    const result = new Recognizer(\n                       rootComponentType, config, urlTree, url, paramsInheritanceStrategy,\n                       relativeLinkResolution)\n                       .recognize();\n    if (result === null) {\n      return newObservableError(new NoMatch());\n    } else {\n      return of(result);\n    }\n  } catch (e) {\n    // Catch the potential error from recognize due to duplicate outlet matches and return as an\n    // `Observable` error instead.\n    return newObservableError(e);\n  }\n}\n\nexport class Recognizer {\n  constructor(\n      private rootComponentType: Type<any>|null, private config: Routes, private urlTree: UrlTree,\n      private url: string, private paramsInheritanceStrategy: ParamsInheritanceStrategy,\n      private relativeLinkResolution: 'legacy'|'corrected') {}\n\n  recognize(): RouterStateSnapshot|null {\n    const rootSegmentGroup =\n        split(\n            this.urlTree.root, [], [], this.config.filter(c => c.redirectTo === undefined),\n            this.relativeLinkResolution)\n            .segmentGroup;\n\n    const children = this.processSegmentGroup(this.config, rootSegmentGroup, PRIMARY_OUTLET);\n    if (children === null) {\n      return null;\n    }\n\n    // Use Object.freeze to prevent readers of the Router state from modifying it outside of a\n    // navigation, resulting in the router being out of sync with the browser.\n    const root = new ActivatedRouteSnapshot(\n        [], Object.freeze({}), Object.freeze({...this.urlTree.queryParams}), this.urlTree.fragment,\n        {}, PRIMARY_OUTLET, this.rootComponentType, null, this.urlTree.root, -1, {});\n\n    const rootNode = new TreeNode<ActivatedRouteSnapshot>(root, children);\n    const routeState = new RouterStateSnapshot(this.url, rootNode);\n    this.inheritParamsAndData(routeState._root);\n    return routeState;\n  }\n\n  inheritParamsAndData(routeNode: TreeNode<ActivatedRouteSnapshot>): void {\n    const route = routeNode.value;\n\n    const i = inheritedParamsDataResolve(route, this.paramsInheritanceStrategy);\n    route.params = Object.freeze(i.params);\n    route.data = Object.freeze(i.data);\n\n    routeNode.children.forEach(n => this.inheritParamsAndData(n));\n  }\n\n  processSegmentGroup(config: Route[], segmentGroup: UrlSegmentGroup, outlet: string):\n      TreeNode<ActivatedRouteSnapshot>[]|null {\n    if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {\n      return this.processChildren(config, segmentGroup);\n    }\n\n    return this.processSegment(config, segmentGroup, segmentGroup.segments, outlet);\n  }\n\n  /**\n   * Matches every child outlet in the `segmentGroup` to a `Route` in the config. Returns `null` if\n   * we cannot find a match for _any_ of the children.\n   *\n   * @param config - The `Routes` to match against\n   * @param segmentGroup - The `UrlSegmentGroup` whose children need to be matched against the\n   *     config.\n   */\n  processChildren(config: Route[], segmentGroup: UrlSegmentGroup):\n      TreeNode<ActivatedRouteSnapshot>[]|null {\n    const children: Array<TreeNode<ActivatedRouteSnapshot>> = [];\n    for (const childOutlet of Object.keys(segmentGroup.children)) {\n      const child = segmentGroup.children[childOutlet];\n      // Sort the config so that routes with outlets that match the one being activated appear\n      // first, followed by routes for other outlets, which might match if they have an empty path.\n      const sortedConfig = sortByMatchingOutlets(config, childOutlet);\n      const outletChildren = this.processSegmentGroup(sortedConfig, child, childOutlet);\n      if (outletChildren === null) {\n        // Configs must match all segment children so because we did not find a match for this\n        // outlet, return `null`.\n        return null;\n      }\n      children.push(...outletChildren);\n    }\n    // Because we may have matched two outlets to the same empty path segment, we can have multiple\n    // activated results for the same outlet. We should merge the children of these results so the\n    // final return value is only one `TreeNode` per outlet.\n    const mergedChildren = mergeEmptyPathMatches(children);\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      // This should really never happen - we are only taking the first match for each outlet and\n      // merge the empty path matches.\n      checkOutletNameUniqueness(mergedChildren);\n    }\n    sortActivatedRouteSnapshots(mergedChildren);\n    return mergedChildren;\n  }\n\n  processSegment(\n      config: Route[], segmentGroup: UrlSegmentGroup, segments: UrlSegment[],\n      outlet: string): TreeNode<ActivatedRouteSnapshot>[]|null {\n    for (const r of config) {\n      const children = this.processSegmentAgainstRoute(r, segmentGroup, segments, outlet);\n      if (children !== null) {\n        return children;\n      }\n    }\n    if (noLeftoversInUrl(segmentGroup, segments, outlet)) {\n      return [];\n    }\n\n    return null;\n  }\n\n  processSegmentAgainstRoute(\n      route: Route, rawSegment: UrlSegmentGroup, segments: UrlSegment[],\n      outlet: string): TreeNode<ActivatedRouteSnapshot>[]|null {\n    if (route.redirectTo || !isImmediateMatch(route, rawSegment, segments, outlet)) return null;\n\n    let snapshot: ActivatedRouteSnapshot;\n    let consumedSegments: UrlSegment[] = [];\n    let rawSlicedSegments: UrlSegment[] = [];\n\n    if (route.path === '**') {\n      const params = segments.length > 0 ? last(segments)!.parameters : {};\n      snapshot = new ActivatedRouteSnapshot(\n          segments, params, Object.freeze({...this.urlTree.queryParams}), this.urlTree.fragment,\n          getData(route), getOutlet(route), route.component!, route,\n          getSourceSegmentGroup(rawSegment), getPathIndexShift(rawSegment) + segments.length,\n          getResolve(route));\n    } else {\n      const result = match(rawSegment, route, segments);\n      if (!result.matched) {\n        return null;\n      }\n      consumedSegments = result.consumedSegments;\n      rawSlicedSegments = segments.slice(result.lastChild);\n\n      snapshot = new ActivatedRouteSnapshot(\n          consumedSegments, result.parameters, Object.freeze({...this.urlTree.queryParams}),\n          this.urlTree.fragment, getData(route), getOutlet(route), route.component!, route,\n          getSourceSegmentGroup(rawSegment),\n          getPathIndexShift(rawSegment) + consumedSegments.length, getResolve(route));\n    }\n\n    const childConfig: Route[] = getChildConfig(route);\n\n    const {segmentGroup, slicedSegments} = split(\n        rawSegment, consumedSegments, rawSlicedSegments,\n        // Filter out routes with redirectTo because we are trying to create activated route\n        // snapshots and don't handle redirects here. That should have been done in\n        // `applyRedirects`.\n        childConfig.filter(c => c.redirectTo === undefined), this.relativeLinkResolution);\n\n    if (slicedSegments.length === 0 && segmentGroup.hasChildren()) {\n      const children = this.processChildren(childConfig, segmentGroup);\n      if (children === null) {\n        return null;\n      }\n      return [new TreeNode<ActivatedRouteSnapshot>(snapshot, children)];\n    }\n\n    if (childConfig.length === 0 && slicedSegments.length === 0) {\n      return [new TreeNode<ActivatedRouteSnapshot>(snapshot, [])];\n    }\n\n    const matchedOnOutlet = getOutlet(route) === outlet;\n    // If we matched a config due to empty path match on a different outlet, we need to continue\n    // passing the current outlet for the segment rather than switch to PRIMARY.\n    // Note that we switch to primary when we have a match because outlet configs look like this:\n    // {path: 'a', outlet: 'a', children: [\n    //  {path: 'b', component: B},\n    //  {path: 'c', component: C},\n    // ]}\n    // Notice that the children of the named outlet are configured with the primary outlet\n    const children = this.processSegment(\n        childConfig, segmentGroup, slicedSegments, matchedOnOutlet ? PRIMARY_OUTLET : outlet);\n    if (children === null) {\n      return null;\n    }\n    return [new TreeNode<ActivatedRouteSnapshot>(snapshot, children)];\n  }\n}\n\nfunction sortActivatedRouteSnapshots(nodes: TreeNode<ActivatedRouteSnapshot>[]): void {\n  nodes.sort((a, b) => {\n    if (a.value.outlet === PRIMARY_OUTLET) return -1;\n    if (b.value.outlet === PRIMARY_OUTLET) return 1;\n    return a.value.outlet.localeCompare(b.value.outlet);\n  });\n}\n\nfunction getChildConfig(route: Route): Route[] {\n  if (route.children) {\n    return route.children;\n  }\n\n  if (route.loadChildren) {\n    return route._loadedConfig!.routes;\n  }\n\n  return [];\n}\n\nfunction hasEmptyPathConfig(node: TreeNode<ActivatedRouteSnapshot>) {\n  const config = node.value.routeConfig;\n  return config && config.path === '' && config.redirectTo === undefined;\n}\n\n/**\n * Finds `TreeNode`s with matching empty path route configs and merges them into `TreeNode` with the\n * children from each duplicate. This is necessary because different outlets can match a single\n * empty path route config and the results need to then be merged.\n */\nfunction mergeEmptyPathMatches(nodes: Array<TreeNode<ActivatedRouteSnapshot>>):\n    Array<TreeNode<ActivatedRouteSnapshot>> {\n  const result: Array<TreeNode<ActivatedRouteSnapshot>> = [];\n  // The set of nodes which contain children that were merged from two duplicate empty path nodes.\n  const mergedNodes: Set<TreeNode<ActivatedRouteSnapshot>> = new Set();\n\n  for (const node of nodes) {\n    if (!hasEmptyPathConfig(node)) {\n      result.push(node);\n      continue;\n    }\n\n    const duplicateEmptyPathNode =\n        result.find(resultNode => node.value.routeConfig === resultNode.value.routeConfig);\n    if (duplicateEmptyPathNode !== undefined) {\n      duplicateEmptyPathNode.children.push(...node.children);\n      mergedNodes.add(duplicateEmptyPathNode);\n    } else {\n      result.push(node);\n    }\n  }\n  // For each node which has children from multiple sources, we need to recompute a new `TreeNode`\n  // by also merging those children. This is necessary when there are multiple empty path configs in\n  // a row. Put another way: whenever we combine children of two nodes, we need to also check if any\n  // of those children can be combined into a single node as well.\n  for (const mergedNode of mergedNodes) {\n    const mergedChildren = mergeEmptyPathMatches(mergedNode.children);\n    result.push(new TreeNode(mergedNode.value, mergedChildren));\n  }\n  return result.filter(n => !mergedNodes.has(n));\n}\n\nfunction checkOutletNameUniqueness(nodes: TreeNode<ActivatedRouteSnapshot>[]): void {\n  const names: {[k: string]: ActivatedRouteSnapshot} = {};\n  nodes.forEach(n => {\n    const routeWithSameOutletName = names[n.value.outlet];\n    if (routeWithSameOutletName) {\n      const p = routeWithSameOutletName.url.map(s => s.toString()).join('/');\n      const c = n.value.url.map(s => s.toString()).join('/');\n      throw new Error(`Two segments cannot have the same outlet name: '${p}' and '${c}'.`);\n    }\n    names[n.value.outlet] = n.value;\n  });\n}\n\nfunction getSourceSegmentGroup(segmentGroup: UrlSegmentGroup): UrlSegmentGroup {\n  let s = segmentGroup;\n  while (s._sourceSegment) {\n    s = s._sourceSegment;\n  }\n  return s;\n}\n\nfunction getPathIndexShift(segmentGroup: UrlSegmentGroup): number {\n  let s = segmentGroup;\n  let res = (s._segmentIndexShift ? s._segmentIndexShift : 0);\n  while (s._sourceSegment) {\n    s = s._sourceSegment;\n    res += (s._segmentIndexShift ? s._segmentIndexShift : 0);\n  }\n  return res - 1;\n}\n\nfunction getData(route: Route): Data {\n  return route.data || {};\n}\n\nfunction getResolve(route: Route): ResolveData {\n  return route.resolve || {};\n}\n"]}