Clout is a library for matching Ring HTTP requests. It uses the same routing syntax as used by popular Ruby web frameworks like Ruby on Rails and Sinatra.
Add the following to your project.clj dependencies:
[clout "2.2.1"]Require Clout in the normal way:
(require '[clout.core :as clout])These following examples also make use of the Ring-Mock library to generate Ring request maps:
(require '[ring.mock.request :as mock])Routes can match by keyword:
(clout/route-matches
"/article/:title"
(mock/request :get "/article/clojure"))
=> {:title "clojure"}Or with wildcards:
(clout/route-matches
"/public/*"
(mock/request :get "/public/style/screen.css"))
=> {:* "style/screen.css"}Clout can also match absolute routes:
(clout/route-matches
"http://subdomain.example.com/"
(mock/request :get "http://subdomain.example.com/"))
=> {}And scheme-relative routes:
(clout/route-matches
"//subdomain.example.com/"
(mock/request :get "http://subdomain.example.com/"))
=> {}
(clout/route-matches
"//subdomain.example.com/"
(mock/request :get "https://subdomain.example.com/"))
=> {}Clout supports both keywords and wildcards. Keywords (like ":title") will
match any character but the following: / . , ; ?. Wildcards (*) will match
anything.
If a route does not match, nil is returned:
(clout/route-matches "/products" (mock/request :get "/articles"))
=> nilFor additional performance, you can choose to pre-compile a route:
(def user-route
(clout/route-compile "/user/:id"))
(clout/route-matches user-route (mock/request :get "/user/10"))
=> {:id "10"}When compiling a route, you can specify a map of regular expressions to use for different keywords. This allows more specific routing:
(def user-route
(clout/route-compile "/user/:id" {:id #"\d+"}))
(clout/route-matches user-route (mock/request :get "/user/10"))
=> {:user "10"}
(clout/route-matches user-route (mock/request :get "/user/jsmith"))
=> nilYou can also specify regular expressions inline in braces after the keyword:
(def user-route
(clout/route-compile "/user/:id{\\d+}"))Note that regular expression escape sequences (like \d) need to be
double-escaped when placed inline in a string.
Copyright © 2018 James Reeves
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.
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