that one doesn't actually work, maybe, not sure why exactly but the
assert is ignored
=> (def component? number?)
#'runtime.q/component?
=> (defmacro defcomponent [name co]
`(assert (component? ~co) "Not a valid IComponent")
`(def ~name ~co))
#'runtime.q/defcomponent
=> (defcomponent a "a")
#'runtime.q/a
The `(do ...) one works though,
=> (defmacro a []
`(println 1)
`(println 2)
)
#'runtime.q/a
=> (a)
2
nil
=> (defmacro a []
`(do
(println 1)
(println 2)
)
)
#'runtime.q/a
=> (a)
1
2
nil
On Thu, Feb 21, 2013 at 3:14 PM, Jim foo.bar <jimpil1...@gmail.com
<mailto:jimpil1...@gmail.com>> wrote:
I tried this and it works, but I need 2 backticks and I'm
essentially generating the assert-form when the macro is
called...I'd like to generate only the def-form at run-time...
(defmacro defcomponent [name co]
`(assert (component? ~co) "Not a valid IComponent")
`(def ~name ~co))
it looks ugly doesn't it?
Jim
On 21/02/13 14:11, AtKaaZ wrote:
or you could place the assert inside the backquote
On Thu, Feb 21, 2013 at 3:10 PM, Jim foo.bar
<jimpil1...@gmail.com <mailto:jimpil1...@gmail.com>> wrote:
On 21/02/13 14:07, Jim foo.bar wrote:
Hi all,
I''d like to have a macro like the following but
preferably without the 'eval' inside the assertion form:
(defmacro defcomponent [name co]
(assert (component? (eval co)) "Not a valid IComponent")
`(def ~name ~co))
If I don't use eval, everything works as long as I pass
a var in...However if I pass in something like (String.
"jam") it is not being evaluated and thus is a list not
an object...and it will never satisfy IComponent.
any thoughts?
thanks in advance :)
Jim
I could have phrased this better...One of my arguments has
to NOT be evaluated (name) but the other needs to be
evaluated (co) so I can assert whatever I want to assert on
it...I cannot use 'defn' (it will cause 'name' to be
evaluated) so my only option is a macro that forces eval on
the second arg, yes?
Jim
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