Define rethrow as a function; Alf's probably right. Also, change to:
~message.
user=> (defn rethrow [ex-class] `(catch ~ex-class x# (throw x#)))
#'user/rethrow
user=>
user=> (defmacro handle-ex [message & body]
`(try ~@body ~(rethrow IllegalArgumentException)
(catch Exception x# (throw (IllegalArgumentException. ~message)))))
#'user/handle-ex
user=>
user=> (handle-ex "no" (throw (IllegalArgumentException. "yes")))
IllegalArgumentException yes user/eval9 (NO_SOURCE_FILE:7)
On Monday, April 1, 2013 8:21:30 AM UTC-7, Bill Robertson wrote:
>
> I was all excited when I was able to consolidate a lot of try/catch logic
> behind a macro earlier this morning. All was good.
>
> I felt like I could do a better job of communicating my intentions in the
> code though with a rethrow construct rather than writing
> (catch FooException #f (throw #f))
>
> I would have liked to have been able to simply write
> (rethrow FooException)
>
> This failed. Poking around the docs a bit, I see that try/catch is a
> special form. Which makes sense.
>
> user=> (defmacro rethrow [ex-class] `(catch ~ex-class x# (throw x#)))
> #'user/rethrow
> user=> (defmacro handle-ex [message & body] `(try ~@body (rethrow
> IllegalArgumentException) (catch Exception x# (throw
> (IllegalArgumentException. message)))))
> #'user/handle-ex
> user=> (handle-ex "no" (throw (IllegalArgumentException. "yes")))
> CompilerException java.lang.RuntimeException: Unable to resolve symbol:
> catch in this context, compiling:(NO_SOURCE_PATH:1:1)
>
> It was a longshot, but I tried to qualify catch. That fails too, because
> it's not really there...
>
> user=> (defmacro rethrow [ex-class] `(clojure.core/catch ~ex-class x#
> (throw x#)))
> #'user/rethrow
> user=> (defmacro handle-ex [message & body] `(try ~@body (rethrow
> IllegalArgumentException) (catch Exception x# (throw
> (IllegalArgumentException. message)))))
> #'user/handle-ex
> user=> (handle-ex "no" (throw (IllegalArgumentException. "yes")))
> CompilerException java.lang.RuntimeException: No such var:
> clojure.core/catch, compiling:(NO_SOURCE_PATH:1:1)
>
> Is this possible to do within the normal bounds of the language?
>
> Thanks!
>
>
>
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