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 <[email protected]> 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 <[email protected]> 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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>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
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--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
--
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first post.
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