On Mon, May 18, 2009 at 4:38 PM, samppi <rbysam...@gmail.com> wrote:
>
> I want to create a function that takes a variable of an error-kit
> error type and inserts it into a handle statement, but when I try, I
> get a strange error. What does the error mean, and is there a way to
> pass a variable error type into a handle statement without resorting
> to macros?
>
> Clojure 1.0.0-
> user=> (use 'clojure.contrib.error-kit)
> nil
> user=> (deferror parse-error [] []
> {:msg "WHEEE", :unhandled (throw-msg IllegalArgumentException)})
> #'user/parse-error
> user=> (defn a [error-type]
> (with-handler
> (raise parse-error)
> (handle error-type [x] x)))
> java.lang.RuntimeException: java.lang.RuntimeException:
> java.lang.RuntimeException: java.lang.Exception: Assert failed: v
> (NO_SOURCE_FILE:13)
When used this way, the first arg to 'handle' must be a literal argument type
name, not a local that contains something. However, you can actually match on
whatever you want (see the "The above is equivalent..." example in the .clj):
(defn a [error-type]
(with-handler
(raise parse-error)
(handle {tag :tag :as this-err}
(if (isa? tag error-type)
(prn :caught this-err)
(do-not-handle)))))
--Chouser
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