Re: [Caml-list] Re: camlp4 question

[Christophe Raffalli <christophe.raffalli@univ-savoie.fr>]

Martin Jambon a écrit :
> On Thu, 8 Sep 2005, Christophe Raffalli wrote:
> 
>> Yet another question ....
>>
>> I was assuming you oculd ask the type of an expression in camlp4 to do 
>> an induction over it (the type) ....
> 
> 
> You can't, Camlp4 is only about parsing and transforming the syntax tree.
> 
> I imagine you could use a (complicated) 3-step approach:
> 1) preprocess the file with camlp4 and ignore the syntax extensions
> 2) compile the result with -dtypes
> 3) fetch the type information from the .annot file and reparse the 
> original file with camlp4. This time you can get the type of each 
> identifier and expand your special syntax constructs
> 
>> I do not see that in the manual !
>>
>> (you can only construct trees with camlp4, but you cannot match them ?)
> 
> 
> You can use quotations in patterns to read the syntax tree. Is it what 
> you mean?


Yes I saw that later (after acually using the type in MLast t odo the 
same ...)

All that lacks a lot of documentation, but in one day, I found my way ;-)

> 
> Martin
> 
> -- 
> Martin Jambon, PhD
> http://martin.jambon.free.fr