RE: [Caml-list] A syntax extension to simplify List manipulation

["Alexander Voinov" <avoinov@gmail.com>]

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Hi

 

I've thrown in your version and used it within that big app, a portion of
which I've presented as an 'example' for the syntax extension. Everything
works well. I've also checked that the compiler correctly points to
locations of syntax errors (probably this was the problem which forced me to
move to camlp5). I will test it more.

 

Can I incorporate your contribution into the deliverable for that extension?

 

Now that this tiny project grows, it's probably worth introducing a
configure script with parameters like --without-interatei and
--enable-camlp5.

 

Thank you!

 

Alexander

 

 

From: blue storm [mailto:bluestorm.dylc@gmail.com] 
Sent: Monday, January 25, 2010 2:32 PM
To: Alexander Voinov
Cc: Damien Doligez; caml-list@yquem.inria.fr
Subject: Re: [Caml-list] A syntax extension to simplify List manipulation

 

On Mon, Jan 25, 2010 at 10:45 PM, Alexander Voinov <avoinov@gmail.com>
wrote:

I've updated this extension to remove the dependency on ExtLib (as suggested
previously). The price is that iteratei is not available with the core List
module.

If you do need iteratei, first uncomment the

# WITH_ITERATEI = 1

line in the Makefile (and do a fresh build), and, second, always

open ExtLib;;


I think you should keep iteratei by default : if the user use an
insufficient List module, he will get a classical "unbound value
List.iteratei" error from the compiler, and will easily relate it to the
code using your extension (as the "iteratei" name is apparent).
If you document that point, it could be much easier than a compile-time
option that requires one to edit the Makefile. If you really want an option
to disallow iteratei syntaxically, you could use command-line options to
make that choice at runtime (that would be more flexible).
I don't know how well camlp5 handle command-line parameters, so I can't help
you there. 



Regarding camlp4, I don't remember why this extension didn't work with it
after that big refactoring, which gave birth to camlp5. I'm making a TODO
for myself to take a look at this.


In case you're interested, attached is a short camlp4 (>= 3.10) port of your
extension (wich wasn't thoroughly tested). As you can see, changes are
minimal. This is just in case, I don't have any opinion on what preprocessor
you should use.
 

The tarball is: http://www.voinov.org/FP/spbSyntax-1.0.1.tgz

(and also http://www.voinov.org/FP/spbSyntax.tgz)

 

PS : the software license is the zlib/png license. Maybe you should mention
it explicitely.


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