just testing the environment

website/js/router.js

@@ -1,17 +1,37 @@
 const routes = [];
 let currentCleanup = null;
 
+/** @returns {{ regex: RegExp, paramNames: string[] }} */
+export function compileRoute(pattern) {
+    const paramNames = [];
+    const parts = pattern.replace(/\/:([^/]+)/g, (_, name) => {
+        paramNames.push(name);
+        return '/([^/]+)';
+    });
+    return { regex: new RegExp('^' + parts + '$'), paramNames };
+}
+
+/** Match a path against a string route pattern; returns params or null. */
+export function matchRoute(pattern, path) {
+    const { regex, paramNames } = compileRoute(pattern);
+    const match = path.match(regex);
+    if (!match) {
+        return null;
+    }
+    const params = {};
+    paramNames.forEach((name, i) => {
+        params[name] = decodeURIComponent(match[i + 1]);
+    });
+    return params;
+}
+
 export function addRoute(pattern, handler) {
     let regex;
-    const paramNames = [];
+    let paramNames = [];
     if (pattern instanceof RegExp) {
         regex = pattern;
     } else {
-        const parts = pattern.replace(/\/:([^/]+)/g, (_, name) => {
-            paramNames.push(name);
-            return '/([^/]+)';
-        });
-        regex = new RegExp('^' + parts + '$');
+        ({ regex, paramNames } = compileRoute(pattern));
     }
     routes.push({ regex, paramNames, handler });
 }