This seems like a bug to me.
user> `[~@(mapcat #(list (keyword %) (str %)) '(a b c))]
[:a "a" :b "b" :c "c"]
user> `(~@(mapcat #(list (keyword %) (str %)) '(a b c)))
(:a "a" :b "b" :c "c")
user> `#{~@(mapcat #(list (keyword %) (str %)) '(a b c))}
#{"a" "b" "c" :a :c :b}
user> `{~@(mapcat #(list (keyword %) (str %)) '(a b c))}
; Evaluation aborted. ArrayIndexOutOfBounds
user> `{~(keyword "x") ~(str "x")}
{:x "x"}
user> `{~@(list (keyword "x") (str "x"))}
; Evaluation aborted. ArrayIndexOutOfBounds
unquote seems to work with maps, but unquote-splicing fails even in
the simplest form with maps.
On Sun, Sep 5, 2010 at 2:19 PM, ingokr <ing...@gmail.com> wrote:
> Hello --
>
> I am trying to gain a better understanding of Clojure's macro
> language.
>
> The output I am aiming for (and which is to be used as code in another
> macro) is as follows:
>
> {:a a :b b :c c :d d}
>
> The attempt I made is as follows:
>
> (defmacro tm [& args]
> `{~@(mapcat (fn [x] (list (keyword x) x)) args)})
>
> Obviously, I am making a very basic mistake, because at the REPL I
> get:
>
> ---
> user=> (defmacro tm [& args]
> `{~@(mapcat (fn [x] (list (keyword x) x)) args)})
> java.lang.ArrayIndexOutOfBoundsException: 1
> java.lang.Exception: Unmatched delimiter: )
> ---
>
> Any pointers are greatly appreciated.
>
> Ingolf
>
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