fix #538

modules/reitit-core/src/reitit/core.cljc

@@ -73,6 +73,23 @@
 ;; Different routers
 ;;
 
+(defn empty-router
+  "Creates an empty routes, not matching to anything"
+  ([] (empty-router nil))
+  ([opts]
+   ^{:type ::router}
+   (reify Router
+     (router-name [_]
+       :empty-router)
+     (routes [_])
+     (compiled-routes [_])
+     (options [_]
+       opts)
+     (route-names [_])
+     (match-by-path [_ _])
+     (match-by-name [_ _])
+     (match-by-name [_ _ _]))))
+
 (defn linear-router
   "Creates a linear-router from resolved routes and optional
   expanded options. See [[router]] for available options, plus the following:
@@ -180,6 +197,8 @@
   ([compiled-routes]
    (trie-router compiled-routes {}))
   ([compiled-routes opts]
+   (if-not compiled-routes
+     (empty-router opts)
      (let [compiler (::trie/trie-compiler opts (trie/compiler))
            names (impl/find-names compiled-routes opts)
            [pl nl] (reduce
@@ -219,7 +238,7 @@
              (match nil)))
          (match-by-name [_ name path-params]
            (if-let [match (impl/fast-get lookup name)]
-           (match (impl/path-params path-params))))))))
+             (match (impl/path-params path-params)))))))))
 
 (defn single-static-path-router
   "Creates a fast router of 1 static route(s) and optional

test/cljc/reitit/core_test.cljc

@@ -431,3 +431,10 @@
                  {:conflicts nil})]
     (is (= :root (-> (r/match-by-path router "/") :data :name)))
     (is (= :root (-> (r/match-by-path router2 "/") :data :name)))))
+
+(deftest routing-bug-test-538
+  (let [router (r/router
+                [["/:a"]
+                 ["/:b"]]
+                {:conflicts nil})]
+    (is (nil? (r/match-by-path router "")))))