Mercurial > lasercutter
annotate src/clojure/contrib/with_ns.clj @ 10:ef7dbbd6452c
added clojure source goodness
| author | Robert McIntyre <rlm@mit.edu> |
|---|---|
| date | Sat, 21 Aug 2010 06:25:44 -0400 |
| parents | |
| children |
| rev | line source |
|---|---|
| rlm@10 | 1 ;;; with_ns.clj -- temporary namespace macro |
| rlm@10 | 2 |
| rlm@10 | 3 ;; by Stuart Sierra, http://stuartsierra.com/ |
| rlm@10 | 4 ;; March 28, 2009 |
| rlm@10 | 5 |
| rlm@10 | 6 ;; Copyright (c) Stuart Sierra, 2009. All rights reserved. The use |
| rlm@10 | 7 ;; and distribution terms for this software are covered by the Eclipse |
| rlm@10 | 8 ;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) |
| rlm@10 | 9 ;; which can be found in the file epl-v10.html at the root of this |
| rlm@10 | 10 ;; distribution. By using this software in any fashion, you are |
| rlm@10 | 11 ;; agreeing to be bound by the terms of this license. You must not |
| rlm@10 | 12 ;; remove this notice, or any other, from this software. |
| rlm@10 | 13 |
| rlm@10 | 14 |
| rlm@10 | 15 (ns |
| rlm@10 | 16 ^{:author "Stuart Sierra", |
| rlm@10 | 17 :doc "Temporary namespace macro"} |
| rlm@10 | 18 clojure.contrib.with-ns) |
| rlm@10 | 19 |
| rlm@10 | 20 (defmacro with-ns |
| rlm@10 | 21 "Evaluates body in another namespace. ns is either a namespace |
| rlm@10 | 22 object or a symbol. This makes it possible to define functions in |
| rlm@10 | 23 namespaces other than the current one." |
| rlm@10 | 24 [ns & body] |
| rlm@10 | 25 `(binding [*ns* (the-ns ~ns)] |
| rlm@10 | 26 ~@(map (fn [form] `(eval '~form)) body))) |
| rlm@10 | 27 |
| rlm@10 | 28 (defmacro with-temp-ns |
| rlm@10 | 29 "Evaluates body in an anonymous namespace, which is then immediately |
| rlm@10 | 30 removed. The temporary namespace will 'refer' clojure.core." |
| rlm@10 | 31 [& body] |
| rlm@10 | 32 `(try |
| rlm@10 | 33 (create-ns 'sym#) |
| rlm@10 | 34 (let [result# (with-ns 'sym# |
| rlm@10 | 35 (clojure.core/refer-clojure) |
| rlm@10 | 36 ~@body)] |
| rlm@10 | 37 result#) |
| rlm@10 | 38 (finally (remove-ns 'sym#)))) |