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core.clj
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core.clj
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(ns compojure.core
"A concise syntax for generating Ring handlers."
(:require [clojure.string :as str])
(:use clout.core
compojure.response
[clojure.core.incubator :only (-?>)]
[clojure.tools.macro :only (name-with-attributes)]))
(defn- method-matches?
"True if this request matches the supplied request method."
[method request]
(let [request-method (request :request-method)
form-method (get-in request [:form-params "_method"])]
(if (and form-method (= request-method :post))
(= (str/upper-case (name method))
(str/upper-case form-method))
(= method request-method))))
(defn- if-method
"Evaluate the handler if the request method matches."
[method handler]
(fn [request]
(cond
(or (nil? method) (method-matches? method request))
(handler request)
(and (= :get method) (= :head (:request-method request)))
(-?> (handler request)
(assoc :body nil)))))
(defn- assoc-route-params
"Associate route parameters with the request map."
[request params]
(merge-with merge request {:route-params params, :params params}))
(defn- if-route
"Evaluate the handler if the route matches the request."
[route handler]
(fn [request]
(if-let [params (route-matches route request)]
(handler (assoc-route-params request params)))))
(defn- prepare-route
"Pre-compile the route."
[route]
(cond
(string? route)
`(route-compile ~route)
(vector? route)
`(route-compile
~(first route)
~(apply hash-map (rest route)))
:else
`(if (string? ~route)
(route-compile ~route)
~route)))
(defn- assoc-&-binding [binds req sym]
(assoc binds sym `(dissoc (:params ~req)
~@(map keyword (keys binds))
~@(map str (keys binds)))))
(defn- assoc-symbol-binding [binds req sym]
(assoc binds sym `(get-in ~req [:params ~(keyword sym)]
(get-in ~req [:params ~(str sym)]))))
(defn- vector-bindings
"Create the bindings for a vector of parameters."
[args req]
(loop [args args, binds {}]
(if-let [sym (first args)]
(cond
(= '& sym)
(recur (nnext args) (assoc-&-binding binds req (second args)))
(= :as sym)
(recur (nnext args) (assoc binds (second args) req))
(symbol? sym)
(recur (next args) (assoc-symbol-binding binds req sym))
:else
(throw (Exception. (str "Unexpected binding: " sym))))
(mapcat identity binds))))
(defmacro let-request [[bindings request] & body]
(if (vector? bindings)
`(let [~@(vector-bindings bindings request)] ~@body)
`(let [~bindings ~request] ~@body)))
(defn make-route
"Returns a function that will only call the handler if the method and Clout
route match the request."
[method route handler]
(if-method method
(if-route route
(fn [request]
(render (handler request) request)))))
(defn- compile-route
"Compile a route in the form (method path & body) into a function."
[method route bindings body]
`(make-route
~method ~(prepare-route route)
(fn [request#]
(let-request [~bindings request#] ~@body))))
(defn routing
"Apply a list of routes to a Ring request map."
[request & handlers]
(some #(% request) handlers))
(defn routes
"Create a Ring handler by combining several handlers into one."
[& handlers]
#(apply routing % handlers))
(defmacro defroutes
"Define a Ring handler function from a sequence of routes. The name may
optionally be followed by a doc-string and metadata map."
[name & routes]
(let [[name routes] (name-with-attributes name routes)]
`(def ~name (routes ~@routes))))
(defmacro GET "Generate a GET route."
[path args & body]
(compile-route :get path args body))
(defmacro POST "Generate a POST route."
[path args & body]
(compile-route :post path args body))
(defmacro PUT "Generate a PUT route."
[path args & body]
(compile-route :put path args body))
(defmacro DELETE "Generate a DELETE route."
[path args & body]
(compile-route :delete path args body))
(defmacro HEAD "Generate a HEAD route."
[path args & body]
(compile-route :head path args body))
(defmacro OPTIONS "Generate an OPTIONS route."
[path args & body]
(compile-route :options path args body))
(defmacro PATCH "Generate a PATCH route."
[path args & body]
(compile-route :patch path args body))
(defmacro ANY "Generate a route that matches any method."
[path args & body]
(compile-route nil path args body))
(defn- remove-suffix [path suffix]
(subs path 0 (- (count path) (count suffix))))
(defn- wrap-context [handler]
(fn [request]
(let [uri (:uri request)
path (:path-info request uri)
context (or (:context request) "")
subpath (-> request :route-params :__path-info)]
(handler
(-> request
(assoc :path-info (if (= subpath "") "/" subpath))
(assoc :context (remove-suffix uri subpath))
(update-in [:params] dissoc :__path-info)
(update-in [:route-params] dissoc :__path-info))))))
(defn- context-route [route]
(let [re-context {:__path-info #"|/.*"}]
(cond
(string? route)
`(route-compile ~(str route ":__path-info") ~re-context)
(vector? route)
`(route-compile
~(str (first route) ":__path-info")
~(merge (apply hash-map (rest route)) re-context))
:else
`(route-compile (str ~route ":__path-info") ~re-context))))
(defmacro context
"Give all routes in the form a common path prefix and set of bindings.
The following example demonstrates defining two routes with a common
path prefix ('/user/:id') and a common binding ('id'):
(context \"/user/:id\" [id]
(GET \"/profile\" [] ...)
(GET \"/settings\" [] ...))"
[path args & routes]
`(#'if-route ~(context-route path)
(#'wrap-context
(fn [request#]
(let-request [~args request#]
(routing request# ~@routes))))))
(defmacro let-routes
"Takes a vector of bindings and a body of routes. Equivalent to:
(let [...] (routes ...))"
[bindings & body]
`(let ~bindings (routes ~@body)))