@angular/router
Version:
Angular - the routing library
296 lines • 43.1 kB
JavaScript
/**
* @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 { PRIMARY_OUTLET } from './shared';
import { UrlSegment, UrlSegmentGroup, UrlTree } from './url_tree';
import { forEach, last, shallowEqual } from './utils/collection';
export function createUrlTree(route, urlTree, commands, queryParams, fragment) {
if (commands.length === 0) {
return tree(urlTree.root, urlTree.root, urlTree, queryParams, fragment);
}
const nav = computeNavigation(commands);
if (nav.toRoot()) {
return tree(urlTree.root, new UrlSegmentGroup([], {}), urlTree, queryParams, fragment);
}
const startingPosition = findStartingPosition(nav, urlTree, route);
const segmentGroup = startingPosition.processChildren ?
updateSegmentGroupChildren(startingPosition.segmentGroup, startingPosition.index, nav.commands) :
updateSegmentGroup(startingPosition.segmentGroup, startingPosition.index, nav.commands);
return tree(startingPosition.segmentGroup, segmentGroup, urlTree, 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(oldSegmentGroup, newSegmentGroup, urlTree, queryParams, fragment) {
let qp = {};
if (queryParams) {
forEach(queryParams, (value, name) => {
qp[name] = Array.isArray(value) ? value.map((v) => `${v}`) : `${value}`;
});
}
if (urlTree.root === oldSegmentGroup) {
return new UrlTree(newSegmentGroup, qp, fragment);
}
return new UrlTree(replaceSegment(urlTree.root, oldSegmentGroup, newSegmentGroup), qp, fragment);
}
function replaceSegment(current, oldSegment, newSegment) {
const children = {};
forEach(current.children, (c, outletName) => {
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 Error('Root segment cannot have matrix parameters');
}
const cmdWithOutlet = commands.find(isCommandWithOutlets);
if (cmdWithOutlet && cmdWithOutlet !== last(commands)) {
throw new Error('{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 = {};
forEach(cmd.outlets, (commands, name) => {
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 findStartingPosition(nav, tree, route) {
if (nav.isAbsolute) {
return new Position(tree.root, true, 0);
}
if (route.snapshot._lastPathIndex === -1) {
const segmentGroup = route.snapshot._urlSegment;
// Pathless ActivatedRoute has _lastPathIndex === -1 but should not process children
// see issue #26224, #13011, #35687
// However, if the ActivatedRoute is the root we should process children like above.
const processChildren = segmentGroup === tree.root;
return new Position(segmentGroup, processChildren, 0);
}
const modifier = isMatrixParams(nav.commands[0]) ? 0 : 1;
const index = route.snapshot._lastPathIndex + modifier;
return createPositionApplyingDoubleDots(route.snapshot._urlSegment, 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 Error('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 = {};
forEach(outlets, (commands, outlet) => {
if (typeof commands === 'string') {
commands = [commands];
}
if (commands !== null) {
children[outlet] = updateSegmentGroup(segmentGroup.children[outlet], startIndex, commands);
}
});
forEach(segmentGroup.children, (child, childOutlet) => {
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 = `${command}`;
const next = currentCommandIndex < commands.length - 1 ? commands[currentCommandIndex + 1] : null;
if (currentPathIndex > 0 && curr === undefined)
break;
if (curr && next && (typeof next === 'object') && next.outlets === undefined) {
if (!compare(curr, next, path))
return noMatch;
currentCommandIndex += 2;
}
else {
if (!compare(curr, {}, path))
return noMatch;
currentCommandIndex++;
}
currentPathIndex++;
}
return { match: true, pathIndex: currentPathIndex, commandIndex: currentCommandIndex };
}
function createNewSegmentGroup(segmentGroup, startIndex, commands) {
const paths = segmentGroup.segments.slice(0, startIndex);
let i = 0;
while (i < commands.length) {
const command = commands[i];
if (isCommandWithOutlets(command)) {
const children = createNewSegmentChildren(command.outlets);
return new UrlSegmentGroup(paths, children);
}
// if we start with an object literal, we need to reuse the path part from the segment
if (i === 0 && isMatrixParams(commands[0])) {
const p = segmentGroup.segments[startIndex];
paths.push(new UrlSegment(p.path, commands[0]));
i++;
continue;
}
const curr = isCommandWithOutlets(command) ? command.outlets[PRIMARY_OUTLET] : `${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 = {};
forEach(outlets, (commands, outlet) => {
if (typeof commands === 'string') {
commands = [commands];
}
if (commands !== null) {
children[outlet] = createNewSegmentGroup(new UrlSegmentGroup([], {}), 0, commands);
}
});
return children;
}
function stringify(params) {
const res = {};
forEach(params, (v, k) => 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 {ActivatedRoute} from './router_state';\nimport {Params, PRIMARY_OUTLET} from './shared';\nimport {UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';\nimport {forEach, last, shallowEqual} from './utils/collection';\n\nexport function createUrlTree(\n    route: ActivatedRoute, urlTree: UrlTree, commands: any[], queryParams: Params,\n    fragment: string): UrlTree {\n  if (commands.length === 0) {\n    return tree(urlTree.root, urlTree.root, urlTree, queryParams, fragment);\n  }\n\n  const nav = computeNavigation(commands);\n\n  if (nav.toRoot()) {\n    return tree(urlTree.root, new UrlSegmentGroup([], {}), urlTree, queryParams, fragment);\n  }\n\n  const startingPosition = findStartingPosition(nav, urlTree, route);\n\n  const segmentGroup = startingPosition.processChildren 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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 findStartingPosition(nav: Navigation, tree: UrlTree, route: ActivatedRoute): Position {\n  if (nav.isAbsolute) {\n    return new Position(tree.root, true, 0);\n  }\n\n  if (route.snapshot._lastPathIndex === -1) {\n    const segmentGroup = route.snapshot._urlSegment;\n    // Pathless ActivatedRoute has _lastPathIndex === -1 but should not process children\n    // see issue #26224, #13011, #35687\n    // However, if the ActivatedRoute is the root we should process children like above.\n    const processChildren = segmentGroup === tree.root;\n    return new Position(segmentGroup, processChildren, 0);\n  }\n\n  const modifier = isMatrixParams(nav.commands[0]) ? 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