universal-router/src/generateUrls.js

/**
 * Universal Router (https://www.kriasoft.com/universal-router/)
 *
 * Copyright (c) 2015-present Kriasoft.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.txt file in the root directory of this source tree.
 */
import { parse, tokensToFunction, } from 'path-to-regexp';
function cacheRoutes(routesByName, route, routes) {
    if (route.name && routesByName.has(route.name)) {
        throw new Error(`Route "${route.name}" already exists`);
    }
    if (route.name) {
        routesByName.set(route.name, route);
    }
    if (routes) {
        for (let i = 0; i < routes.length; i++) {
            const childRoute = routes[i];
            childRoute.parent = route;
            cacheRoutes(routesByName, childRoute, childRoute.children);
        }
    }
}
/**
 * Create a function to generate urls by route names.
 */
function generateUrls(router, options) {
    if (!router) {
        throw new ReferenceError('Router is not defined');
    }
    const routesByName = new Map();
    const regexpByRoute = new Map();
    const opts = { encode: encodeURIComponent, ...options };
    return (routeName, params) => {
        let route = routesByName.get(routeName);
        if (!route) {
            routesByName.clear();
            regexpByRoute.clear();
            cacheRoutes(routesByName, router.root, router.root.children);
            route = routesByName.get(routeName);
            if (!route) {
                throw new Error(`Route "${routeName}" not found`);
            }
        }
        let regexp = regexpByRoute.get(route);
        if (!regexp) {
            let fullPath = '';
            let rt = route;
            while (rt) {
                const path = Array.isArray(rt.path) ? rt.path[0] : rt.path;
                if (path) {
                    fullPath = path + fullPath;
                }
                rt = rt.parent;
            }
            const tokens = parse(fullPath, opts);
            const toPath = tokensToFunction(tokens, opts);
            const keys = Object.create(null);
            for (let i = 0; i < tokens.length; i++) {
                const token = tokens[i];
                if (typeof token !== 'string') {
                    keys[token.name] = true;
                }
            }
            regexp = { toPath, keys };
            regexpByRoute.set(route, regexp);
        }
        let url = router.baseUrl + regexp.toPath(params) || '/';
        if (opts.stringifyQueryParams && params) {
            const queryParams = {};
            const keys = Object.keys(params);
            for (let i = 0; i < keys.length; i++) {
                const key = keys[i];
                if (!regexp.keys[key]) {
                    queryParams[key] = params[key];
                }
            }
            const query = opts.stringifyQueryParams(queryParams);
            if (query) {
                url += query.charAt(0) === '?' ? query : `?${query}`;
            }
        }
        return url;
    };
}
export default generateUrls;
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