Re: [Caml-list] Is it possible to extend OCaml lexer rules via Camlp4?

[Nicolas Pouillard <nicolas.pouillard@gmail.com>]

On Thu, Nov 3, 2011 at 10:16 AM, Jérémie Dimino <jeremie@dimino.org> wrote:
> Hi,
>
> On Thu, Nov 03, 2011 at 04:12:29PM +0900, Jun Furuse wrote:
>> I want to have pcre regexp literals in the same syntax as Perl i.e.
>> /hello\sworld\\n/. Currently what we do in OCaml is Pcre.regexp
>> "hello\\sworld\\\\n", where the backslash char must be escaped in a
>> OCaml string literal. This is lousy for scripting in OCaml.

As said earlier Camlp4's lexer is not extensible. One can change
the meaning of the token stream using the token filters but this
won't work in your case. The third option is to use quotations this
is really the adapted feature for this task. Of course the syntax
won't be as concise as /bla/...

Regarding OCaml lexing you may be interested in camllexer [1] which
is not intended to be extensible but is very small and selfcontained.
If you really want to hack your own lexical syntax I suggest you to fork
camllexer and change it for your purpose.

[1]: https://github.com/np/camllexer

Best regards,

-- 
Nicolas Pouillard
http://nicolaspouillard.fr