84 lines
2.0 KiB
TypeScript
84 lines
2.0 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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export class Tree<T> {
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/** @internal */
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_root: TreeNode<T>;
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constructor(root: TreeNode<T>) { this._root = root; }
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get root(): T { return this._root.value; }
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/**
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* @deprecated (use ActivatedRoute.parent instead)
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*/
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parent(t: T): T {
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const p = this.pathFromRoot(t);
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return p.length > 1 ? p[p.length - 2] : null;
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}
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/**
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* @deprecated (use ActivatedRoute.children instead)
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*/
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children(t: T): T[] {
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const n = findNode(t, this._root);
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return n ? n.children.map(t => t.value) : [];
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}
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/**
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* @deprecated (use ActivatedRoute.firstChild instead)
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*/
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firstChild(t: T): T {
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const n = findNode(t, this._root);
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return n && n.children.length > 0 ? n.children[0].value : null;
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}
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/**
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* @deprecated
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*/
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siblings(t: T): T[] {
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const p = findPath(t, this._root, []);
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if (p.length < 2) return [];
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const c = p[p.length - 2].children.map(c => c.value);
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return c.filter(cc => cc !== t);
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}
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/**
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* @deprecated (use ActivatedRoute.pathFromRoot instead)
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*/
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pathFromRoot(t: T): T[] { return findPath(t, this._root, []).map(s => s.value); }
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}
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function findNode<T>(expected: T, c: TreeNode<T>): TreeNode<T> {
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if (expected === c.value) return c;
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for (let cc of c.children) {
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const r = findNode(expected, cc);
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if (r) return r;
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}
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return null;
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}
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function findPath<T>(expected: T, c: TreeNode<T>, collected: TreeNode<T>[]): TreeNode<T>[] {
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collected.push(c);
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if (expected === c.value) return collected;
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for (let cc of c.children) {
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const cloned = collected.slice(0);
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const r = findPath(expected, cc, cloned);
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if (r.length > 0) return r;
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}
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return [];
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}
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export class TreeNode<T> {
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constructor(public value: T, public children: TreeNode<T>[]) {}
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toString(): string { return `TreeNode(${this.value})`; }
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} |