I can't speak to the issues that Gary raised, but I can help you with your
macro.
(defmacro servlet [servlet-name & meths]
`(reify Servlet
~@(for [meth meths]
(let [[method-name args & body] meth
method-name (hyphenated->camel-case method-name)]
`(~method-name ~args ~@body)))))
The key here is to keep track of when things are run. The `for` must be run
at compile time in order to generate the code we want, so we have to escape
it with ~@. The code that the `for` creates (in the form of a list) must
then be (quasi-)quoted again by the backtick.
Macros certainly take some getting used to.
On Tue, Jun 18, 2013 at 8:12 AM, Hussein B. <hubaghd...@gmail.com> wrote:
> Here is my fourth attempt:
>
> (defmacro servlet [servlet-name & meths]
> `(reify Servlet
> (for [meth ~meths]
> (let [[method-name args & body] ~meth
> camel-case-method-name (hyphenated->camel-case ~method-name)]
> (camel-case-method-name ~args ~@body)))))
>
> Still it is not working :(
>
> How to fix it?
>
> On Tuesday, June 18, 2013 12:04:50 AM UTC+2, Gary Trakhman wrote:
>
>> Unquoting 'camel-case-method-name' is going to try and replace the symbol
>> with it's value during compile-time in the context of the macro itself.
>>
>> also, reify isn't going to work if you need a named class to actually
>> wire up your servlet, for example with a web.xml. Also, consider that
>> you'll need some AOT compilation for the container to actually see the
>> servlet class.
>>
>>
>> On Mon, Jun 17, 2013 at 4:38 PM, Hussein B. <hubag...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> My target is to have something like this:
>>>
>>> (servlet "ArticlesServlet"
>>> (do-get [this request response]
>>> (println "Get Request"))
>>> (do-post [this request response]
>>> (println "Post Request")))
>>>
>>>
>>> I started with this:
>>>
>>> (defmacro servlet [servlet-name meths]
>>> `(reify Servlet
>>> (for [meth ~@meths]
>>> (let [[method-name params & body] meth
>>> camel-case-method-name (hyphenated->camel-case
>>> method-name)]
>>> (~camel-case-method-name ~@body)))))
>>>
>>> But of course, it is not working :)
>>>
>>> I get:
>>>
>>> CompilerException java.lang.RuntimeException: Unable to resolve symbol:
>>> camel-case-method-name in this context
>>>
>>> Why?
>>>
>>> And of course, feel super free to correct my Macro :)
>>>
>>> Thanks for help and time.
>>>
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>>
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