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* Pure environment-agnostic module for compiling route patterns and matching URLs.
*/
export class RouteMatcher {
/**
* Brings a declared route pattern into the form a normalized hash has.
*
* A hash is normalized to `#/path` before matching, but the pattern used to
* be compiled exactly as written -- so only a pattern spelled `#/...`
* could ever match. `''`, `'/'` and `'/about'` compiled to regexes
* (`^$`, `^/$`, `^/about$`) that no normalized hash can satisfy, and the
* route was silently dead: no match, no error, an empty container.
*
* The scaffolded routing template hid this by declaring the root twice,
* `'': 'Home'` next to `'#/': 'Home'`, so the working spelling carried the
* dead one. The compiler already treats all four forms as the same route
* (`normalizeRoute` in lib/compiler/atlas/routes.js), so this is also what
* makes Atlas's model and the runtime agree about what a route table says.
* @param {string} routePattern - The pattern as declared.
* @returns {string} The pattern in `#/path` form.
*/
static normalizePattern(routePattern) {
let path = String(routePattern);
if (path.startsWith('#')) path = path.slice(1);
if (!path.startsWith('/')) path = '/' + path;
return '#' + path;
}
/**
* Compiles a route pattern into a regular expression, tracking parameter names.
* @param {string} routePattern - The route pattern (e.g. '/user/:id').
* @returns {{regex: RegExp, paramNames: string[]}}
*/
static compileRoute(routePattern) {
const paramNames = [];
const escaped = routePattern.replace(/[.+^${}()|[\]\\]/g, '\\$&');
const regexStr = escaped.replace(/(:[a-zA-Z0-9_$]+)|(\*)/g, (_match, param) => {
if (param) {
paramNames.push(param.slice(1));
return '([^/]+)';
}
paramNames.push('wildcard');
return '(.*)';
});
return { regex: new RegExp(`^${regexStr}$`), paramNames };
}
/**
* Normalizes a hash string with an optional namespace prefix.
* @param {string} hash - Raw hash string (e.g. '#/app1/home').
* @param {string} [prefix] - Namespace prefix (e.g. '/app1').
* @returns {string|null} Normalized hash (e.g. '#/home'), or null if prefix does not match.
*/
static normalizeHash(hash, prefix) {
let normalized = hash || '#/';
const secondHashIndex = normalized.indexOf('#', 1);
if (secondHashIndex !== -1) {
normalized = normalized.substring(0, secondHashIndex);
}
// A bare '#' is what every `<a href="#">` in a page puts in the URL, and
// what a browser leaves behind when a hash is cleared. It means the root,
// so it has to normalize to the root rather than to a path of its own that
// no pattern can match.
if (normalized === '#') {
normalized = '#/';
}
if (prefix) {
const expectedStart = '#' + prefix;
if (!normalized.startsWith(expectedStart)) {
return null;
}
normalized = '#' + normalized.substring(expectedStart.length);
if (!normalized.startsWith('#/')) {
normalized = '#/' + normalized.substring(1);
}
}
return normalized;
}
/**
* Recursively finds a route match.
* @param {Object} routes - The routes configuration
* @param {string} decodedPath - The decoded path to match against
* @param {string} basePath - The accumulated base path
* @param {Object|null} parentDef - The parent route definition, if any
* @returns {Object|null} The match result or null if not found
*/
static _findMatch(routes, decodedPath, basePath = '', parentDef = null) {
for (const [routePattern, routeDef] of Object.entries(routes)) {
if (routePattern === '*') continue;
let fullPattern = routePattern;
if (basePath) {
if (basePath.endsWith('/') && routePattern.startsWith('/')) {
fullPattern = basePath + routePattern.slice(1);
} else if (!basePath.endsWith('/') && !routePattern.startsWith('/')) {
fullPattern = basePath + '/' + routePattern;
} else {
fullPattern = basePath + routePattern;
}
}
// Normalized here rather than per declared pattern, so a nested child
// joins to its parent as written and the join is normalized once.
fullPattern = RouteMatcher.normalizePattern(fullPattern);
const { regex, paramNames } = RouteMatcher.compileRoute(fullPattern);
const match = decodedPath.match(regex);
if (match) {
return {
pattern: fullPattern,
definition: routeDef,
parent: parentDef,
match,
paramNames
};
}
if (routeDef && typeof routeDef === 'object' && routeDef.children) {
let childRoutes = routeDef.children;
if (Array.isArray(childRoutes)) {
childRoutes = childRoutes.reduce((acc, child) => {
acc[child.path] = child;
return acc;
}, {});
}
const nestedMatch = this._findMatch(childRoutes, decodedPath, fullPattern, {
pattern: fullPattern,
definition: routeDef
});
if (nestedMatch) return nestedMatch;
}
}
return null;
}
/**
* Checks if the route definitions have a non-fallback match for the given hash.
* @param {Object<string, any>} routes - Map of route patterns.
* @param {string} hash - The URL hash.
* @param {object} [options] - Router options (e.g. prefix).
* @returns {boolean} True if a non-fallback route matches.
*/
static matches(routes, hash, options = {}) {
const normalizedHash = RouteMatcher.normalizeHash(hash, options.prefix);
if (normalizedHash === null) {
return false;
}
const [pathPart] = normalizedHash.split('?');
let decodedPath;
try {
decodedPath = decodeURIComponent(pathPart);
} catch {
decodedPath = pathPart;
}
return !!this._findMatch(routes, decodedPath);
}
/**
* Matches a hash string against a collection of routes.
* @param {Object<string, any>} routes - Map of route patterns to definitions.
* @param {string} hash - The URL hash.
* @param {object} [options] - Router options (e.g. prefix).
* @param {Iterable<object>} [activeRouters] - Active router instances to check for fallback wildcard resolution.
* @param {object} [currentRouter] - The current router instance.
* @returns {object}
*/
static matchRoute(routes, hash, options = {}, activeRouters = [], currentRouter = null) {
const normalizedHash = RouteMatcher.normalizeHash(hash, options.prefix);
if (normalizedHash === null) {
return { matchedRoute: null, params: {}, otherRouterMatches: false, normalizedHash: null };
}
let matchedRoute = null;
const params = {};
const query = {};
const [pathPart, queryPart] = normalizedHash.split('?');
let decodedPath;
try {
decodedPath = decodeURIComponent(pathPart);
} catch {
decodedPath = pathPart;
}
if (queryPart) {
const queryParams = new URLSearchParams(queryPart);
for (const [key, value] of queryParams.entries()) {
if (value === 'true') {
query[key] = true;
} else if (value === 'false') {
query[key] = false;
} else if (/^\d+$/.test(value)) {
query[key] = Number(value);
} else {
query[key] = value;
}
}
}
const found = this._findMatch(routes, decodedPath);
if (found) {
matchedRoute = { pattern: found.pattern, definition: found.definition };
if (found.parent) {
matchedRoute.parent = found.parent;
}
found.paramNames.forEach((name, idx) => {
const value = found.match[idx + 1];
try {
params[name] = decodeURIComponent(value);
} catch {
params[name] = value;
}
});
if (Object.keys(query).length > 0) {
params.query = { ...query };
}
}
let otherRouterMatches = false;
if (!matchedRoute && routes['*']) {
const rawHash = hash || '#/';
otherRouterMatches = Array.from(activeRouters || []).some(
(r) => r !== currentRouter && typeof r.matches === 'function' && r.matches(rawHash),
);
if (!otherRouterMatches) {
matchedRoute = { pattern: '*', definition: routes['*'] };
}
}
return { matchedRoute, params, query, path: pathPart, otherRouterMatches, normalizedHash };
}
}
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