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authorCarlo Zancanaro <carlo@clearboxsystems.com.au>2013-08-10 00:53:06 +1000
committerCarlo Zancanaro <carlo@clearboxsystems.com.au>2013-08-10 00:53:06 +1000
commit809dee0523d267c49b970a91a5cbe7aa119627fd (patch)
tree39f71f1d33ceaef1766141902cc22ba0d66dd7a5
Initial commit.
-rw-r--r--.hgignore13
-rw-r--r--project.clj7
-rw-r--r--src/reverse_routing/core.clj82
3 files changed, 102 insertions, 0 deletions
diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..6b052fa
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,13 @@
+syntax: glob
+target
+lib
+classes
+checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+.lein-deps-sum
+.lein-failures
+.lein-plugins
+.lein-repl-history
diff --git a/project.clj b/project.clj
new file mode 100644
index 0000000..431b954
--- /dev/null
+++ b/project.clj
@@ -0,0 +1,7 @@
+(defproject reverse-routing "0.1.0-SNAPSHOT"
+ :description "FIXME: write description"
+ :url "http://example.com/FIXME"
+ :license {:name "Eclipse Public License"
+ :url "http://www.eclipse.org/legal/epl-v10.html"}
+ :dependencies [[org.clojure/clojure "1.5.1"]
+ [compojure "1.1.5"]])
diff --git a/src/reverse_routing/core.clj b/src/reverse_routing/core.clj
new file mode 100644
index 0000000..4936064
--- /dev/null
+++ b/src/reverse_routing/core.clj
@@ -0,0 +1,82 @@
+(ns reverse-routing.core
+ (:require [clojure.string :as string]))
+
+(defn wrap-reverse-routing [handler & {:keys [root] :or {:root ""}}]
+ (fn [request]
+ (let [route-table (->> handler meta ::routes)
+ request (assoc request
+ ::reverse-routes route-table
+ ::root root)]
+ (handler request))))
+
+(defn ^:private routing [request & handlers]
+ (some #(% request) handlers))
+
+(defn routes [& handlers]
+ (let [merge-first (partial merge-with (fn [x y] x))]
+ (apply vary-meta #(apply routing % handlers)
+ update-in [::routes]
+ merge-first (map (comp ::routes meta) handlers))))
+
+(defmacro context [path args & routes]
+ (let [string-path (if (vector? path) (first path) path)]
+ `(with-meta (compojure.core/context ~path ~args ~@routes)
+ {::routes (let [path-keys# (:keys (clout.core/route-compile ~string-path))
+ ~args [] ;; wow. could this be hackier? I doubt it.
+ ]
+ (->> (for [routes# (map (comp ::routes meta) (list ~@routes))
+ [key# val#] routes#]
+ [key# {:uri (str ~string-path (:uri val#))
+ :args (concat path-keys# (:args val#))
+ :type (:type val#)}])
+ (into {})))})))
+
+(defmacro register-route [route-name [type path args & body :as route]]
+ (let [string-path (if (vector? path) (first path) path)]
+ `(with-meta ~route
+ {::routes {~route-name {:uri ~string-path
+ :type ~(keyword (string/lower-case (name type)))
+ :args (:keys (clout.core/route-compile ~string-path))}}})))
+
+(defn url-for [request route & arg-values]
+ (let [{:keys [uri type args]} (-> request ::reverse-routes route)
+ root-path (::root request)]
+ (str root-path
+ (reduce (fn [string [name val]]
+ (clojure.string/replace string (str name) (str val)))
+ uri (map vector args arg-values)))))
+
+(comment
+
+ (require '[compojure.core :refer [GET]])
+
+ (def test-routes
+ (-> (routes
+ (->> (GET "/user/:id" {{id :id} :params :as request}
+ (url-for request :get-something id))
+ (register-route :get-user))
+ (->> (GET "/person/:id" {{id :id} :params :as request}
+ (url-for request :get-user id))
+ (register-route :get-person))
+ (context "/something/:id" [id]
+ (GET "/nom" []
+ "something, blah!")
+ (->> (GET "/name" {:as request}
+ (url-for request :get-person id))
+ (register-route :get-something))
+ (->> (GET ["/nam/:blah", :blah #"1\d+"] {{bloo :blah} :params :as request}
+ (url-for request :get-something-else id 10))
+ (register-route :get-something-else))))
+ wrap-reverse-routing))
+
+ (test-routes {:request-method :get
+ :scheme :http
+ ;;:uri "/something/15/name"
+ ;;:uri "/person/15"
+ :uri "/user/15"
+ ;;:uri "/something/15/nam/12"
+ ;;:uri "/something/10/nom"
+ :remote-addr "127.0.0.1"
+ :server-port 8080
+ :server-name "something"})
+ )