/**
 * @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 { PRIMARY_OUTLET } from './shared';
import { createRoot, squashSegmentGroup, UrlSegment, UrlSegmentGroup, UrlTree } from './url_tree';
import { last, shallowEqual } from './utils/collection';
/**
 * Creates a `UrlTree` relative to an `ActivatedRouteSnapshot`.
 *
 * @publicApi
 *
 *
 * @param relativeTo The `ActivatedRouteSnapshot` to apply the commands to
 * @param commands An array of URL fragments with which to construct the new URL tree.
 * If the path is static, can be the literal URL string. For a dynamic path, pass an array of path
 * segments, followed by the parameters for each segment.
 * The fragments are applied to the one provided in the `relativeTo` parameter.
 * @param queryParams The query parameters for the `UrlTree`. `null` if the `UrlTree` does not have
 *     any query parameters.
 * @param fragment The fragment for the `UrlTree`. `null` if the `UrlTree` does not have a fragment.
 *
 * @usageNotes
 *
 * ```
 * // create /team/33/user/11
 * createUrlTreeFromSnapshot(snapshot, ['/team', 33, 'user', 11]);
 *
 * // create /team/33;expand=true/user/11
 * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {expand: true}, 'user', 11]);
 *
 * // you can collapse static segments like this (this works only with the first passed-in value):
 * createUrlTreeFromSnapshot(snapshot, ['/team/33/user', userId]);
 *
 * // If the first segment can contain slashes, and you do not want the router to split it,
 * // you can do the following:
 * createUrlTreeFromSnapshot(snapshot, [{segmentPath: '/one/two'}]);
 *
 * // create /team/33/(user/11//right:chat)
 * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {outlets: {primary: 'user/11', right:
 * 'chat'}}], null, null);
 *
 * // remove the right secondary node
 * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {outlets: {primary: 'user/11', right: null}}]);
 *
 * // For the examples below, assume the current URL is for the `/team/33/user/11` and the
 * `ActivatedRouteSnapshot` points to `user/11`:
 *
 * // navigate to /team/33/user/11/details
 * createUrlTreeFromSnapshot(snapshot, ['details']);
 *
 * // navigate to /team/33/user/22
 * createUrlTreeFromSnapshot(snapshot, ['../22']);
 *
 * // navigate to /team/44/user/22
 * createUrlTreeFromSnapshot(snapshot, ['../../team/44/user/22']);
 * ```
 */
export function createUrlTreeFromSnapshot(relativeTo, commands, queryParams = null, fragment = null) {
    const relativeToUrlSegmentGroup = createSegmentGroupFromRoute(relativeTo);
    return createUrlTreeFromSegmentGroup(relativeToUrlSegmentGroup, commands, queryParams, fragment);
}
export function createSegmentGroupFromRoute(route) {
    let targetGroup;
    function createSegmentGroupFromRouteRecursive(currentRoute) {
        const childOutlets = {};
        for (const childSnapshot of currentRoute.children) {
            const root = createSegmentGroupFromRouteRecursive(childSnapshot);
            childOutlets[childSnapshot.outlet] = root;
        }
        const segmentGroup = new UrlSegmentGroup(currentRoute.url, childOutlets);
        if (currentRoute === route) {
            targetGroup = segmentGroup;
        }
        return segmentGroup;
    }
    const rootCandidate = createSegmentGroupFromRouteRecursive(route.root);
    const rootSegmentGroup = createRoot(rootCandidate);
    return targetGroup ?? rootSegmentGroup;
}
export function createUrlTreeFromSegmentGroup(relativeTo, commands, queryParams, fragment) {
    let root = relativeTo;
    while (root.parent) {
        root = root.parent;
    }
    // There are no commands so the `UrlTree` goes to the same path as the one created from the
    // `UrlSegmentGroup`. All we need to do is update the `queryParams` and `fragment` without
    // applying any other logic.
    if (commands.length === 0) {
        return tree(root, root, root, queryParams, fragment);
    }
    const nav = computeNavigation(commands);
    if (nav.toRoot()) {
        return tree(root, root, new UrlSegmentGroup([], {}), queryParams, fragment);
    }
    const position = findStartingPositionForTargetGroup(nav, root, relativeTo);
    const newSegmentGroup = position.processChildren ?
        updateSegmentGroupChildren(position.segmentGroup, position.index, nav.commands) :
        updateSegmentGroup(position.segmentGroup, position.index, nav.commands);
    return tree(root, position.segmentGroup, newSegmentGroup, queryParams, fragment);
}
function isMatrixParams(command) {
    return typeof command === 'object' && command != null && !command.outlets && !command.segmentPath;
}
/**
 * Determines if a given command has an `outlets` map. When we encounter a command
 * with an outlets k/v map, we need to apply each outlet individually to the existing segment.
 */
function isCommandWithOutlets(command) {
    return typeof command === 'object' && command != null && command.outlets;
}
function tree(oldRoot, oldSegmentGroup, newSegmentGroup, queryParams, fragment) {
    let qp = {};
    if (queryParams) {
        Object.entries(queryParams).forEach(([name, value]) => {
            qp[name] = Array.isArray(value) ? value.map((v) => `${v}`) : `${value}`;
        });
    }
    let rootCandidate;
    if (oldRoot === oldSegmentGroup) {
        rootCandidate = newSegmentGroup;
    }
    else {
        rootCandidate = replaceSegment(oldRoot, oldSegmentGroup, newSegmentGroup);
    }
    const newRoot = createRoot(squashSegmentGroup(rootCandidate));
    return new UrlTree(newRoot, qp, fragment);
}
/**
 * Replaces the `oldSegment` which is located in some child of the `current` with the `newSegment`.
 * This also has the effect of creating new `UrlSegmentGroup` copies to update references. This
 * shouldn't be necessary but the fallback logic for an invalid ActivatedRoute in the creation uses
 * the Router's current url tree. If we don't create new segment groups, we end up modifying that
 * value.
 */
function replaceSegment(current, oldSegment, newSegment) {
    const children = {};
    Object.entries(current.children).forEach(([outletName, c]) => {
        if (c === oldSegment) {
            children[outletName] = newSegment;
        }
        else {
            children[outletName] = replaceSegment(c, oldSegment, newSegment);
        }
    });
    return new UrlSegmentGroup(current.segments, children);
}
class Navigation {
    constructor(isAbsolute, numberOfDoubleDots, commands) {
        this.isAbsolute = isAbsolute;
        this.numberOfDoubleDots = numberOfDoubleDots;
        this.commands = commands;
        if (isAbsolute && commands.length > 0 && isMatrixParams(commands[0])) {
            throw new RuntimeError(4003 /* RuntimeErrorCode.ROOT_SEGMENT_MATRIX_PARAMS */, (typeof ngDevMode === 'undefined' || ngDevMode) &&
                'Root segment cannot have matrix parameters');
        }
        const cmdWithOutlet = commands.find(isCommandWithOutlets);
        if (cmdWithOutlet && cmdWithOutlet !== last(commands)) {
            throw new RuntimeError(4004 /* RuntimeErrorCode.MISPLACED_OUTLETS_COMMAND */, (typeof ngDevMode === 'undefined' || ngDevMode) &&
                '{outlets:{}} has to be the last command');
        }
    }
    toRoot() {
        return this.isAbsolute && this.commands.length === 1 && this.commands[0] == '/';
    }
}
/** Transforms commands to a normalized `Navigation` */
function computeNavigation(commands) {
    if ((typeof commands[0] === 'string') && commands.length === 1 && commands[0] === '/') {
        return new Navigation(true, 0, commands);
    }
    let numberOfDoubleDots = 0;
    let isAbsolute = false;
    const res = commands.reduce((res, cmd, cmdIdx) => {
        if (typeof cmd === 'object' && cmd != null) {
            if (cmd.outlets) {
                const outlets = {};
                Object.entries(cmd.outlets).forEach(([name, commands]) => {
                    outlets[name] = typeof commands === 'string' ? commands.split('/') : commands;
                });
                return [...res, { outlets }];
            }
            if (cmd.segmentPath) {
                return [...res, cmd.segmentPath];
            }
        }
        if (!(typeof cmd === 'string')) {
            return [...res, cmd];
        }
        if (cmdIdx === 0) {
            cmd.split('/').forEach((urlPart, partIndex) => {
                if (partIndex == 0 && urlPart === '.') {
                    // skip './a'
                }
                else if (partIndex == 0 && urlPart === '') { //  '/a'
                    isAbsolute = true;
                }
                else if (urlPart === '..') { //  '../a'
                    numberOfDoubleDots++;
                }
                else if (urlPart != '') {
                    res.push(urlPart);
                }
            });
            return res;
        }
        return [...res, cmd];
    }, []);
    return new Navigation(isAbsolute, numberOfDoubleDots, res);
}
class Position {
    constructor(segmentGroup, processChildren, index) {
        this.segmentGroup = segmentGroup;
        this.processChildren = processChildren;
        this.index = index;
    }
}
function findStartingPositionForTargetGroup(nav, root, target) {
    if (nav.isAbsolute) {
        return new Position(root, true, 0);
    }
    if (!target) {
        // `NaN` is used only to maintain backwards compatibility with incorrectly mocked
        // `ActivatedRouteSnapshot` in tests. In prior versions of this code, the position here was
        // determined based on an internal property that was rarely mocked, resulting in `NaN`. In
        // reality, this code path should _never_ be touched since `target` is not allowed to be falsey.
        return new Position(root, false, NaN);
    }
    if (target.parent === null) {
        return new Position(target, true, 0);
    }
    const modifier = isMatrixParams(nav.commands[0]) ? 0 : 1;
    const index = target.segments.length - 1 + modifier;
    return createPositionApplyingDoubleDots(target, index, nav.numberOfDoubleDots);
}
function createPositionApplyingDoubleDots(group, index, numberOfDoubleDots) {
    let g = group;
    let ci = index;
    let dd = numberOfDoubleDots;
    while (dd > ci) {
        dd -= ci;
        g = g.parent;
        if (!g) {
            throw new RuntimeError(4005 /* RuntimeErrorCode.INVALID_DOUBLE_DOTS */, (typeof ngDevMode === 'undefined' || ngDevMode) && 'Invalid number of \'../\'');
        }
        ci = g.segments.length;
    }
    return new Position(g, false, ci - dd);
}
function getOutlets(commands) {
    if (isCommandWithOutlets(commands[0])) {
        return commands[0].outlets;
    }
    return { [PRIMARY_OUTLET]: commands };
}
function updateSegmentGroup(segmentGroup, startIndex, commands) {
    if (!segmentGroup) {
        segmentGroup = new UrlSegmentGroup([], {});
    }
    if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {
        return updateSegmentGroupChildren(segmentGroup, startIndex, commands);
    }
    const m = prefixedWith(segmentGroup, startIndex, commands);
    const slicedCommands = commands.slice(m.commandIndex);
    if (m.match && m.pathIndex < segmentGroup.segments.length) {
        const g = new UrlSegmentGroup(segmentGroup.segments.slice(0, m.pathIndex), {});
        g.children[PRIMARY_OUTLET] =
            new UrlSegmentGroup(segmentGroup.segments.slice(m.pathIndex), segmentGroup.children);
        return updateSegmentGroupChildren(g, 0, slicedCommands);
    }
    else if (m.match && slicedCommands.length === 0) {
        return new UrlSegmentGroup(segmentGroup.segments, {});
    }
    else if (m.match && !segmentGroup.hasChildren()) {
        return createNewSegmentGroup(segmentGroup, startIndex, commands);
    }
    else if (m.match) {
        return updateSegmentGroupChildren(segmentGroup, 0, slicedCommands);
    }
    else {
        return createNewSegmentGroup(segmentGroup, startIndex, commands);
    }
}
function updateSegmentGroupChildren(segmentGroup, startIndex, commands) {
    if (commands.length === 0) {
        return new UrlSegmentGroup(segmentGroup.segments, {});
    }
    else {
        const outlets = getOutlets(commands);
        const children = {};
        // If the set of commands applies to anything other than the primary outlet and the child
        // segment is an empty path primary segment on its own, we want to apply the commands to the
        // empty child path rather than here. The outcome is that the empty primary child is effectively
        // removed from the final output UrlTree. Imagine the following config:
        //
        // {path: '', children: [{path: '**', outlet: 'popup'}]}.
        //
        // Navigation to /(popup:a) will activate the child outlet correctly Given a follow-up
        // navigation with commands
        // ['/', {outlets: {'popup': 'b'}}], we _would not_ want to apply the outlet commands to the
        // root segment because that would result in
        // //(popup:a)(popup:b) since the outlet command got applied one level above where it appears in
        // the `ActivatedRoute` rather than updating the existing one.
        //
        // Because empty paths do not appear in the URL segments and the fact that the segments used in
        // the output `UrlTree` are squashed to eliminate these empty paths where possible
        // https://github.com/angular/angular/blob/13f10de40e25c6900ca55bd83b36bd533dacfa9e/packages/router/src/url_tree.ts#L755
        // it can be hard to determine what is the right thing to do when applying commands to a
        // `UrlSegmentGroup` that is created from an "unsquashed"/expanded `ActivatedRoute` tree.
        // This code effectively "squashes" empty path primary routes when they have no siblings on
        // the same level of the tree.
        if (Object.keys(outlets).some(o => o !== PRIMARY_OUTLET) &&
            segmentGroup.children[PRIMARY_OUTLET] && segmentGroup.numberOfChildren === 1 &&
            segmentGroup.children[PRIMARY_OUTLET].segments.length === 0) {
            const childrenOfEmptyChild = updateSegmentGroupChildren(segmentGroup.children[PRIMARY_OUTLET], startIndex, commands);
            return new UrlSegmentGroup(segmentGroup.segments, childrenOfEmptyChild.children);
        }
        Object.entries(outlets).forEach(([outlet, commands]) => {
            if (typeof commands === 'string') {
                commands = [commands];
            }
            if (commands !== null) {
                children[outlet] = updateSegmentGroup(segmentGroup.children[outlet], startIndex, commands);
            }
        });
        Object.entries(segmentGroup.children).forEach(([childOutlet, child]) => {
            if (outlets[childOutlet] === undefined) {
                children[childOutlet] = child;
            }
        });
        return new UrlSegmentGroup(segmentGroup.segments, children);
    }
}
function prefixedWith(segmentGroup, startIndex, commands) {
    let currentCommandIndex = 0;
    let currentPathIndex = startIndex;
    const noMatch = { match: false, pathIndex: 0, commandIndex: 0 };
    while (currentPathIndex < segmentGroup.segments.length) {
        if (currentCommandIndex >= commands.length)
            return noMatch;
        const path = segmentGroup.segments[currentPathIndex];
        const command = commands[currentCommandIndex];
        // Do not try to consume command as part of the prefixing if it has outlets because it can
        // contain outlets other than the one being processed. Consuming the outlets command would
        // result in other outlets being ignored.
        if (isCommandWithOutlets(command)) {
            break;
        }
        const curr = `${command}`;
        const next = currentCommandIndex < commands.length - 1 ? commands[currentCommandIndex + 1] : null;
        if (currentPathIndex > 0 && curr === undefined)
            break;
        if (curr && next && (typeof next === 'object') && next.outlets === undefined) {
            if (!compare(curr, next, path))
                return noMatch;
            currentCommandIndex += 2;
        }
        else {
            if (!compare(curr, {}, path))
                return noMatch;
            currentCommandIndex++;
        }
        currentPathIndex++;
    }
    return { match: true, pathIndex: currentPathIndex, commandIndex: currentCommandIndex };
}
function createNewSegmentGroup(segmentGroup, startIndex, commands) {
    const paths = segmentGroup.segments.slice(0, startIndex);
    let i = 0;
    while (i < commands.length) {
        const command = commands[i];
        if (isCommandWithOutlets(command)) {
            const children = createNewSegmentChildren(command.outlets);
            return new UrlSegmentGroup(paths, children);
        }
        // if we start with an object literal, we need to reuse the path part from the segment
        if (i === 0 && isMatrixParams(commands[0])) {
            const p = segmentGroup.segments[startIndex];
            paths.push(new UrlSegment(p.path, stringify(commands[0])));
            i++;
            continue;
        }
        const curr = isCommandWithOutlets(command) ? command.outlets[PRIMARY_OUTLET] : `${command}`;
        const next = (i < commands.length - 1) ? commands[i + 1] : null;
        if (curr && next && isMatrixParams(next)) {
            paths.push(new UrlSegment(curr, stringify(next)));
            i += 2;
        }
        else {
            paths.push(new UrlSegment(curr, {}));
            i++;
        }
    }
    return new UrlSegmentGroup(paths, {});
}
function createNewSegmentChildren(outlets) {
    const children = {};
    Object.entries(outlets).forEach(([outlet, commands]) => {
        if (typeof commands === 'string') {
            commands = [commands];
        }
        if (commands !== null) {
            children[outlet] = createNewSegmentGroup(new UrlSegmentGroup([], {}), 0, commands);
        }
    });
    return children;
}
function stringify(params) {
    const res = {};
    Object.entries(params).forEach(([k, v]) => res[k] = `${v}`);
    return res;
}
function compare(path, params, segment) {
    return path == segment.path && shallowEqual(params, segment.parameters);
}
//# 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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 {ɵRuntimeError as RuntimeError} from '@angular/core';\n\nimport {RuntimeErrorCode} from './errors';\nimport {ActivatedRouteSnapshot} from './router_state';\nimport {Params, PRIMARY_OUTLET} from './shared';\nimport {createRoot, squashSegmentGroup, UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';\nimport {last, shallowEqual} from './utils/collection';\n\n\n/**\n * Creates a `UrlTree` relative to an `ActivatedRouteSnapshot`.\n *\n * @publicApi\n *\n *\n * @param relativeTo The `ActivatedRouteSnapshot` to apply the commands to\n * @param commands An array of URL fragments with which to construct the new URL tree.\n * If the path is static, can be the literal URL string. For a dynamic path, pass an array of path\n * segments, followed by the parameters for each segment.\n * The fragments are applied to the one provided in the `relativeTo` parameter.\n * @param queryParams The query parameters for the `UrlTree`. `null` if the `UrlTree` does not have\n *     any query parameters.\n * @param fragment The fragment for the `UrlTree`. `null` if the `UrlTree` does not have a fragment.\n *\n * @usageNotes\n *\n * ```\n * // create /team/33/user/11\n * createUrlTreeFromSnapshot(snapshot, ['/team', 33, 'user', 11]);\n *\n * // create /team/33;expand=true/user/11\n * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {expand: true}, 'user', 11]);\n *\n * // you can collapse static segments like this (this works only with the first passed-in value):\n * createUrlTreeFromSnapshot(snapshot, ['/team/33/user', userId]);\n *\n * // If the first segment can contain slashes, and you do not want the router to split it,\n * // you can do the following:\n * createUrlTreeFromSnapshot(snapshot, [{segmentPath: '/one/two'}]);\n *\n * // create /team/33/(user/11//right:chat)\n * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {outlets: {primary: 'user/11', right:\n * 'chat'}}], null, null);\n *\n * // remove the right secondary node\n * createUrlTreeFromSnapshot(snapshot, ['/team', 33, {outlets: {primary: 'user/11', right: null}}]);\n *\n * // For the examples below, assume the current URL is for the `/team/33/user/11` and the\n * `ActivatedRouteSnapshot` points to `user/11`:\n *\n * // navigate to /team/33/user/11/details\n * createUrlTreeFromSnapshot(snapshot, ['details']);\n *\n * // navigate to /team/33/user/22\n * createUrlTreeFromSnapshot(snapshot, ['../22']);\n *\n * // navigate to /team/44/user/22\n * createUrlTreeFromSnapshot(snapshot, ['../../team/44/user/22']);\n * ```\n */\nexport function createUrlTreeFromSnapshot(\n    relativeTo: ActivatedRouteSnapshot, commands: any[], queryParams: Params|null = null,\n    fragment: string|null = null): UrlTree {\n  const relativeToUrlSegmentGroup = createSegmentGroupFromRoute(relativeTo);\n  return createUrlTreeFromSegmentGroup(relativeToUrlSegmentGroup, commands, queryParams, fragment);\n}\n\nexport function createSegmentGroupFromRoute(route: ActivatedRouteSnapshot): UrlSegmentGroup {\n  let targetGroup: UrlSegmentGroup|undefined;\n\n  function createSegmentGroupFromRouteRecursive(currentRoute: ActivatedRouteSnapshot):\n      UrlSegmentGroup {\n    const childOutlets: {[outlet: string]: UrlSegmentGroup} = {};\n    for (const childSnapshot of currentRoute.children) {\n      const root = createSegmentGroupFromRouteRecursive(childSnapshot);\n      childOutlets[childSnapshot.outlet] = root;\n    }\n    const segmentGroup = new UrlSegmentGroup(currentRoute.url, childOutlets);\n    if (currentRoute === route) {\n      targetGroup = segmentGroup;\n    }\n    return segmentGroup;\n  }\n  const rootCandidate = createSegmentGroupFromRouteRecursive(route.root);\n  const rootSegmentGroup = createRoot(rootCandidate);\n\n  return targetGroup ?? rootSegmentGroup;\n}\n\nexport function createUrlTreeFromSegmentGroup(\n    relativeTo: UrlSegmentGroup, commands: any[], queryParams: Params|null,\n    fragment: string|null): UrlTree {\n  let root = relativeTo;\n  while (root.parent) {\n    root = root.parent;\n  }\n  // There are no commands so the `UrlTree` goes to the same path as the one created from the\n  // `UrlSegmentGroup`. All we need to do is update the `queryParams` and `fragment` without\n  // applying any other logic.\n  if (commands.length === 0) {\n    return tree(root, root, root, queryParams, fragment);\n  }\n\n  const nav = computeNavigation(commands);\n\n  if (nav.toRoot()) {\n    return tree(root, root, new UrlSegmentGroup([], {}), queryParams, fragment);\n  }\n\n  const position = findStartingPositionForTargetGroup(nav, root, relativeTo);\n  const newSegmentGroup = position.processChildren ?\n      updateSegmentGroupChildren(position.segmentGroup, position.index, nav.commands) :\n      updateSegmentGroup(position.segmentGroup, position.index, nav.commands);\n  return tree(root, position.segmentGroup, newSegmentGroup, queryParams, fragment);\n}\n\nfunction isMatrixParams(command: any): boolean {\n  return typeof command === 'object' && command != null && !command.outlets && !command.segmentPath;\n}\n\n/**\n * Determines if a given command has an `outlets` map. When we encounter a command\n * with an outlets k/v map, we need to apply each outlet individually to the existing segment.\n */\nfunction isCommandWithOutlets(command: any): command is {outlets: {[key: string]: any}} {\n  return typeof command === 'object' && command != null && command.outlets;\n}\n\nfunction tree(\n    oldRoot: UrlSegmentGroup, oldSegmentGroup: UrlSegmentGroup, newSegmentGroup: UrlSegmentGroup,\n    queryParams: Params|null, fragment: string|null): UrlTree {\n  let qp: any = {};\n  if (queryParams) {\n    Object.entries(queryParams).forEach(([name, value]) => {\n      qp[name] = Array.isArray(value) ? value.map((v: any) => `${v}`) : `${value}`;\n    });\n  }\n\n  let rootCandidate: UrlSegmentGroup;\n  if (oldRoot === oldSegmentGroup) {\n    rootCandidate = newSegmentGroup;\n  } else {\n    rootCandidate = replaceSegment(oldRoot, oldSegmentGroup, newSegmentGroup);\n  }\n\n  const newRoot = createRoot(squashSegmentGroup(rootCandidate));\n  return new UrlTree(newRoot, qp, fragment);\n}\n\n/**\n * Replaces the `oldSegment` which is located in some child of the `current` with the `newSegment`.\n * This also has the effect of creating new `UrlSegmentGroup` copies to update references. This\n * shouldn't be necessary but the fallback logic for an invalid ActivatedRoute in the creation uses\n * the Router's current url tree. If we don't create new segment groups, we end up modifying that\n * value.\n */\nfunction replaceSegment(\n    current: UrlSegmentGroup, oldSegment: UrlSegmentGroup,\n    newSegment: UrlSegmentGroup): UrlSegmentGroup {\n  const children: {[key: string]: UrlSegmentGroup} = {};\n  Object.entries(current.children).forEach(([outletName, c]) => {\n    if (c === oldSegment) {\n      children[outletName] = newSegment;\n    } else {\n      children[outletName] = replaceSegment(c, oldSegment, newSegment);\n    }\n  });\n  return new UrlSegmentGroup(current.segments, children);\n}\n\nclass Navigation {\n  constructor(\n      public isAbsolute: boolean, public numberOfDoubleDots: number, public commands: any[]) {\n    if (isAbsolute && commands.length > 0 && isMatrixParams(commands[0])) {\n      throw new RuntimeError(\n          RuntimeErrorCode.ROOT_SEGMENT_MATRIX_PARAMS,\n          (typeof ngDevMode === 'undefined' || ngDevMode) &&\n              'Root segment cannot have matrix parameters');\n    }\n\n    const cmdWithOutlet = commands.find(isCommandWithOutlets);\n    if (cmdWithOutlet && cmdWithOutlet !== last(commands)) {\n      throw new RuntimeError(\n          RuntimeErrorCode.MISPLACED_OUTLETS_COMMAND,\n          (typeof ngDevMode === 'undefined' || ngDevMode) &&\n              '{outlets:{}} has to be the last command');\n    }\n  }\n\n  public toRoot(): boolean {\n    return this.isAbsolute && this.commands.length === 1 && this.commands[0] == '/';\n  }\n}\n\n/** Transforms commands to a normalized `Navigation` */\nfunction computeNavigation(commands: any[]): Navigation {\n  if ((typeof commands[0] === 'string') && commands.length === 1 && commands[0] === '/') {\n    return new Navigation(true, 0, commands);\n  }\n\n  let numberOfDoubleDots = 0;\n  let isAbsolute = false;\n\n  const res: any[] = commands.reduce((res, cmd, cmdIdx) => {\n    if (typeof cmd === 'object' && cmd != null) {\n      if (cmd.outlets) {\n        const outlets: {[k: string]: any} = {};\n        Object.entries(cmd.outlets).forEach(([name, commands]) => {\n          outlets[name] = typeof commands === 'string' ? commands.split('/') : commands;\n        });\n        return [...res, {outlets}];\n      }\n\n      if (cmd.segmentPath) {\n        return [...res, cmd.segmentPath];\n      }\n    }\n\n    if (!(typeof cmd === 'string')) {\n      return [...res, cmd];\n    }\n\n    if (cmdIdx === 0) {\n      cmd.split('/').forEach((urlPart, partIndex) => {\n        if (partIndex == 0 && urlPart === '.') {\n          // skip './a'\n        } else if (partIndex == 0 && urlPart === '') {  //  '/a'\n          isAbsolute = true;\n        } else if (urlPart === '..') {  //  '../a'\n          numberOfDoubleDots++;\n        } else if (urlPart != '') {\n          res.push(urlPart);\n        }\n      });\n\n      return res;\n    }\n\n    return [...res, cmd];\n  }, []);\n\n  return new Navigation(isAbsolute, numberOfDoubleDots, res);\n}\n\nclass Position {\n  constructor(\n      public segmentGroup: UrlSegmentGroup, public processChildren: boolean, public index: number) {\n  }\n}\n\nfunction findStartingPositionForTargetGroup(\n    nav: Navigation, root: UrlSegmentGroup, target: UrlSegmentGroup): Position {\n  if (nav.isAbsolute) {\n    return new Position(root, true, 0);\n  }\n\n  if (!target) {\n    // `NaN` is used only to maintain backwards compatibility with incorrectly mocked\n    // `ActivatedRouteSnapshot` in tests. In prior versions of this code, the position here was\n    // determined based on an internal property that was rarely mocked, resulting in `NaN`. In\n    // reality, this code path should _never_ be touched since `target` is not allowed to be falsey.\n    return new Position(root, false, NaN);\n  }\n  if (target.parent === null) {\n    return new Position(target, true, 0);\n  }\n\n  const modifier = isMatrixParams(nav.commands[0]) ? 0 : 1;\n  const index = target.segments.length - 1 + modifier;\n  return createPositionApplyingDoubleDots(target, index, nav.numberOfDoubleDots);\n}\n\nfunction createPositionApplyingDoubleDots(\n    group: UrlSegmentGroup, index: number, numberOfDoubleDots: number): Position {\n  let g = group;\n  let ci = index;\n  let dd = numberOfDoubleDots;\n  while (dd > ci) {\n    dd -= ci;\n    g = g.parent!;\n    if (!g) {\n      throw new RuntimeError(\n          RuntimeErrorCode.INVALID_DOUBLE_DOTS,\n          (typeof ngDevMode === 'undefined' || ngDevMode) && 'Invalid number of \\'../\\'');\n    }\n    ci = g.segments.length;\n  }\n  return new Position(g, false, ci - dd);\n}\n\nfunction getOutlets(commands: unknown[]): {[k: string]: unknown[]|string} {\n  if (isCommandWithOutlets(commands[0])) {\n    return commands[0].outlets;\n  }\n\n  return {[PRIMARY_OUTLET]: commands};\n}\n\nfunction updateSegmentGroup(\n    segmentGroup: UrlSegmentGroup, startIndex: number, commands: any[]): UrlSegmentGroup {\n  if (!segmentGroup) {\n    segmentGroup = new UrlSegmentGroup([], {});\n  }\n  if (segmentGroup.segments.length === 0 && segmentGroup.hasChildren()) {\n    return updateSegmentGroupChildren(segmentGroup, startIndex, commands);\n  }\n\n  const m = prefixedWith(segmentGroup, startIndex, commands);\n  const slicedCommands = commands.slice(m.commandIndex);\n  if (m.match && m.pathIndex < segmentGroup.segments.length) {\n    const g = new UrlSegmentGroup(segmentGroup.segments.slice(0, m.pathIndex), {});\n    g.children[PRIMARY_OUTLET] =\n        new UrlSegmentGroup(segmentGroup.segments.slice(m.pathIndex), segmentGroup.children);\n    return updateSegmentGroupChildren(g, 0, slicedCommands);\n  } else if (m.match && slicedCommands.length === 0) {\n    return new UrlSegmentGroup(segmentGroup.segments, {});\n  } else if (m.match && !segmentGroup.hasChildren()) {\n    return createNewSegmentGroup(segmentGroup, startIndex, commands);\n  } else if (m.match) {\n    return updateSegmentGroupChildren(segmentGroup, 0, slicedCommands);\n  } else {\n    return createNewSegmentGroup(segmentGroup, startIndex, commands);\n  }\n}\n\nfunction updateSegmentGroupChildren(\n    segmentGroup: UrlSegmentGroup, startIndex: number, commands: any[]): UrlSegmentGroup {\n  if (commands.length === 0) {\n    return new UrlSegmentGroup(segmentGroup.segments, {});\n  } else {\n    const outlets = getOutlets(commands);\n    const children: {[key: string]: UrlSegmentGroup} = {};\n    // If the set of commands applies to anything other than the primary outlet and the child\n    // segment is an empty path primary segment on its own, we want to apply the commands to the\n    // empty child path rather than here. The outcome is that the empty primary child is effectively\n    // removed from the final output UrlTree. Imagine the following config:\n    //\n    // {path: '', children: [{path: '**', outlet: 'popup'}]}.\n    //\n    // Navigation to /(popup:a) will activate the child outlet correctly Given a follow-up\n    // navigation with commands\n    // ['/', {outlets: {'popup': 'b'}}], we _would not_ want to apply the outlet commands to the\n    // root segment because that would result in\n    // //(popup:a)(popup:b) since the outlet command got applied one level above where it appears in\n    // the `ActivatedRoute` rather than updating the existing one.\n    //\n    // Because empty paths do not appear in the URL segments and the fact that the segments used in\n    // the output `UrlTree` are squashed to eliminate these empty paths where possible\n    // https://github.com/angular/angular/blob/13f10de40e25c6900ca55bd83b36bd533dacfa9e/packages/router/src/url_tree.ts#L755\n    // it can be hard to determine what is the right thing to do when applying commands to a\n    // `UrlSegmentGroup` that is created from an \"unsquashed\"/expanded `ActivatedRoute` tree.\n    // This code effectively \"squashes\" empty path primary routes when they have no siblings on\n    // the same level of the tree.\n    if (Object.keys(outlets).some(o => o !== PRIMARY_OUTLET) &&\n        segmentGroup.children[PRIMARY_OUTLET] && segmentGroup.numberOfChildren === 1 &&\n        segmentGroup.children[PRIMARY_OUTLET].segments.length === 0) {\n      const childrenOfEmptyChild =\n          updateSegmentGroupChildren(segmentGroup.children[PRIMARY_OUTLET], startIndex, commands);\n      return new UrlSegmentGroup(segmentGroup.segments, childrenOfEmptyChild.children);\n    }\n\n    Object.entries(outlets).forEach(([outlet, commands]) => {\n      if (typeof commands === 'string') {\n        commands = [commands];\n      }\n      if (commands !== null) {\n        children[outlet] = updateSegmentGroup(segmentGroup.children[outlet], startIndex, commands);\n      }\n    });\n\n    Object.entries(segmentGroup.children).forEach(([childOutlet, child]) => {\n      if (outlets[childOutlet] === undefined) {\n        children[childOutlet] = child;\n      }\n    });\n    return new UrlSegmentGroup(segmentGroup.segments, children);\n  }\n}\n\nfunction prefixedWith(segmentGroup: UrlSegmentGroup, startIndex: number, commands: any[]) {\n  let currentCommandIndex = 0;\n  let currentPathIndex = startIndex;\n\n  const noMatch = {match: false, pathIndex: 0, commandIndex: 0};\n  while (currentPathIndex < segmentGroup.segments.length) {\n    if (currentCommandIndex >= commands.length) return noMatch;\n    const path = segmentGroup.segments[currentPathIndex];\n    const command = commands[currentCommandIndex];\n    // Do not try to consume command as part of the prefixing if it has outlets because it can\n    // contain outlets other than the one being processed. Consuming the outlets command would\n    // result in other outlets being ignored.\n    if (isCommandWithOutlets(command)) {\n      break;\n    }\n    const curr = `${command}`;\n    const next =\n        currentCommandIndex < commands.length - 1 ? commands[currentCommandIndex + 1] : null;\n\n    if (currentPathIndex > 0 && curr === undefined) break;\n\n    if (curr && next && (typeof next === 'object') && next.outlets === undefined) {\n      if (!compare(curr, next, path)) return noMatch;\n      currentCommandIndex += 2;\n    } else {\n      if (!compare(curr, {}, path)) return noMatch;\n      currentCommandIndex++;\n    }\n    currentPathIndex++;\n  }\n\n  return {match: true, pathIndex: currentPathIndex, commandIndex: currentCommandIndex};\n}\n\nfunction createNewSegmentGroup(\n    segmentGroup: UrlSegmentGroup, startIndex: number, commands: any[]): UrlSegmentGroup {\n  const paths = segmentGroup.segments.slice(0, startIndex);\n\n  let i = 0;\n  while (i < commands.length) {\n    const command = commands[i];\n    if (isCommandWithOutlets(command)) {\n      const children = createNewSegmentChildren(command.outlets);\n      return new UrlSegmentGroup(paths, children);\n    }\n\n    // if we start with an object literal, we need to reuse the path part from the segment\n    if (i === 0 && isMatrixParams(commands[0])) {\n      const p = segmentGroup.segments[startIndex];\n      paths.push(new UrlSegment(p.path, stringify(commands[0])));\n      i++;\n      continue;\n    }\n\n    const curr = isCommandWithOutlets(command) ? command.outlets[PRIMARY_OUTLET] : `${command}`;\n    const next = (i < commands.length - 1) ? commands[i + 1] : null;\n    if (curr && next && isMatrixParams(next)) {\n      paths.push(new UrlSegment(curr, stringify(next)));\n      i += 2;\n    } else {\n      paths.push(new UrlSegment(curr, {}));\n      i++;\n    }\n  }\n  return new UrlSegmentGroup(paths, {});\n}\n\nfunction createNewSegmentChildren(outlets: {[name: string]: unknown[]|string}):\n    {[outlet: string]: UrlSegmentGroup} {\n  const children: {[outlet: string]: UrlSegmentGroup} = {};\n  Object.entries(outlets).forEach(([outlet, commands]) => {\n    if (typeof commands === 'string') {\n      commands = [commands];\n    }\n    if (commands !== null) {\n      children[outlet] = createNewSegmentGroup(new UrlSegmentGroup([], {}), 0, commands);\n    }\n  });\n  return children;\n}\n\nfunction stringify(params: {[key: string]: any}): {[key: string]: string} {\n  const res: {[key: string]: string} = {};\n  Object.entries(params).forEach(([k, v]) => res[k] = `${v}`);\n  return res;\n}\n\nfunction compare(path: string, params: {[key: string]: any}, segment: UrlSegment): boolean {\n  return path == segment.path && shallowEqual(params, segment.parameters);\n}\n"]}