this is what i'd use
(def component? number?)
*(defmacro defcomponent [name co]
`(let [c# ~co]
(assert (component? c#)
(str "Not a valid IComponent passed:\nevaluated form: `"
(pr-str c#) "`\noriginal form: `"
'~co "`\nfull form: `" '~&form "`"
"\nlocation: " ~(meta &form) " file: " ~*file*
))
(def ~name c#)
)
)*
=> *assert*
true
=> (defcomponent a (do "a" (str "b")))
AssertionError Assert failed: Not a valid IComponent passed:
evaluated form: `"b"`
original form: `(do "a" (str "b"))`
full form: `(defcomponent a (do "a" (str "b")))`
location: {:column 1, :line 96} file: util\funxions.clj
(util.funxions/component? c__33004__auto__) util.funxions/eval33010
(funxions.clj:96)
(defcomponent a (do "a" (str "b")))
=>* (defcomponent a (+ 1 2))*
#'runtime.q/a
=> a
3
On Thu, Feb 21, 2013 at 3:51 PM, AtKaaZ <[email protected]> wrote:
> I think the assert is working but either something eats up the thrown
> exception silently which would explain why def isn't reached, OR the
> defcomponent is never called, OR it is called with a different name param
> as you'd have expected. Try putting something before the assert to log if
> that point was ever reached.
>
>
> On Thu, Feb 21, 2013 at 3:29 PM, Jim foo.bar <[email protected]> wrote:
>
>> oops major typo! the correct is:
>>
>>
>> (defmacro defcomponent [name co]
>> `(let [c# ~co]
>> (assert (component? c#) "Not a valid IComponent")
>> (def ~name c#)))
>>
>> However, this doesn't work! Something weird with the assertion...If I
>> comment it out it works as expected, otherwise the var is unbound at the
>> end! strange stuff....I may end up using 'eval' as I used to...
>>
>> Jim
>>
>>
>>
>> On 21/02/13 14:20, Jim foo.bar wrote:
>>
>> I settled for:
>>
>> (defmacro defcomponent [name co]
>> `(let [c# ~co]
>> (assert (component? c# "Not a valid IComponent"))
>> (def ~name c#)))
>>
>> Jim
>>
>> On 21/02/13 14:18, AtKaaZ wrote:
>>
>> 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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>>
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>>
>
>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
>
--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
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