141 lines
4.3 KiB
TypeScript
141 lines
4.3 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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export module collections {
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const hasOwnProperty = Object.prototype.hasOwnProperty;
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export function lookup<T>(collection: { [keys: string]: T }, key: string): T | null {
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if (hasOwnProperty.call(collection, key)) {
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return collection[key];
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}
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return null;
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}
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export function insert<T>(collection: { [keys: string]: T }, key: string, value: T): void {
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collection[key] = value;
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}
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export function lookupOrInsert<T>(collection: { [keys: string]: T }, key: string, value: T): T {
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if (hasOwnProperty.call(collection, key)) {
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return collection[key];
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} else {
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collection[key] = value;
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return value;
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}
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}
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export function forEach<T>(collection: { [keys: string]: T }, callback: (entry: { key: string; value: T }) => void): void {
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for (const key in collection) {
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if (hasOwnProperty.call(collection, key)) {
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callback({
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key: key,
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value: collection[key]
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});
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}
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}
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}
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export function contains(collection: { [keys: string]: any }, key: string): boolean {
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return hasOwnProperty.call(collection, key);
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}
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}
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export module strings {
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/**
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* The empty string. The one and only.
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*/
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export const empty = '';
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export const eolUnix = '\r\n';
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export function format(value: string, ...rest: any[]): string {
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return value.replace(/({\d+})/g, function (match) {
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const index = Number(match.substring(1, match.length - 1));
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return String(rest[index]) || match;
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});
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}
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}
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export module graph {
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export interface Node<T> {
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data: T;
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incoming: { [key: string]: Node<T> };
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outgoing: { [key: string]: Node<T> };
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}
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export function newNode<T>(data: T): Node<T> {
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return {
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data: data,
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incoming: {},
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outgoing: {}
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};
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}
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export class Graph<T> {
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private _nodes: { [key: string]: Node<T> } = {};
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constructor(private _hashFn: (element: T) => string) {
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// empty
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}
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traverse(start: T, inwards: boolean, callback: (data: T) => void): void {
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const startNode = this.lookup(start);
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if (!startNode) {
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return;
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}
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this._traverse(startNode, inwards, {}, callback);
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}
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private _traverse(node: Node<T>, inwards: boolean, seen: { [key: string]: boolean }, callback: (data: T) => void): void {
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const key = this._hashFn(node.data);
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if (collections.contains(seen, key)) {
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return;
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}
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seen[key] = true;
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callback(node.data);
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const nodes = inwards ? node.outgoing : node.incoming;
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collections.forEach(nodes, (entry) => this._traverse(entry.value, inwards, seen, callback));
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}
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inertEdge(from: T, to: T): void {
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const fromNode = this.lookupOrInsertNode(from);
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const toNode = this.lookupOrInsertNode(to);
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fromNode.outgoing[this._hashFn(to)] = toNode;
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toNode.incoming[this._hashFn(from)] = fromNode;
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}
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removeNode(data: T): void {
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const key = this._hashFn(data);
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delete this._nodes[key];
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collections.forEach(this._nodes, (entry) => {
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delete entry.value.outgoing[key];
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delete entry.value.incoming[key];
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});
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}
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lookupOrInsertNode(data: T): Node<T> {
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const key = this._hashFn(data);
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let node = collections.lookup(this._nodes, key);
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if (!node) {
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node = newNode(data);
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this._nodes[key] = node;
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}
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return node;
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}
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lookup(data: T): Node<T> | null {
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return collections.lookup(this._nodes, this._hashFn(data));
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}
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}
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}
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