104 lines
2.5 KiB
TypeScript
104 lines
2.5 KiB
TypeScript
/*
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* Copyright (C) 2021 Aravinth Manivannan <realaravinth@batsense.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** Removes trailing slash from URI */
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const normalizeUri = (uri: string) => {
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uri = uri.trim();
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if (uri.length == 0) {
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throw new Error("uri is empty");
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}
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const uriLength = uri.length;
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if (uri[uriLength - 1] == "/") {
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uri = uri.slice(0, uriLength - 1);
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}
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return uri;
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};
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/** URI<-> Fn mapping type */
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type routeTuple = {
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pattern: RegExp;
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fn: () => void;
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};
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/**
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* Router that selectively executes fucntions
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* based on window.location.pathname
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* */
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export class Router {
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routes: Array<routeTuple>;
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constructor() {
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this.routes = [];
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}
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/**
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* registers a route-function pair with Router
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* @param {string} uri - route to be registered
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* @param {function} fn: - function to be registered when window.locatin.path
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* matches uri
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* */
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register(uri: string, fn: () => void): void {
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uri = normalizeUri(uri);
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const pattern = new RegExp(`^${uri}$`);
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const patterString = pattern.toString();
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if (
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this.routes.find((route) => {
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if (route.pattern.toString() == patterString) {
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return true;
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} else {
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return false;
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}
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})
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) {
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throw new Error("URI exists");
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}
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const route: routeTuple = {
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pattern,
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fn,
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};
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this.routes.push(route);
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}
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/**
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* executes registered function with route
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* matches window.pathname.location
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* */
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route(): void {
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const path = normalizeUri(window.location.pathname);
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let fn: undefined | (() => void);
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if (
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this.routes.find((route) => {
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if (path.match(route.pattern)) {
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fn = route.fn;
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return true;
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}
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})
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) {
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if (fn === undefined) {
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throw new Error("Route isn't registered");
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} else {
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return fn();
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}
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}
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}
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}
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