[Caml-list] [ANN] cppo 0.9.2 - cpp for OCaml

[Martin Jambon <martin.jambon@ens-lyon.org>]

Dear list,

I would like to announce the release of cppo 0.9.2 which contains a few
additional features since the last announcement in 2009.

  http://martin.jambon.free.fr/cppo.html

cppo is a lightweight preprocessor analogous to cpp and compatible with
the OCaml syntax. It provides the classic directives #define, #include,
#ifdef, etc.

Documentation: http://martin.jambon.free.fr/cppo-manual-0.9.2.txt


New features:

1. #ext directive: calling external preprocessors
2. STRINGIFY and CONCAT


1. #ext directive: calling external preprocessors
=================================================

The new #ext directive allows to call an external command to process a
lines of input until #endext.

$ cat example1.ml
let msg =
#ext rot13
  "BPnzy ehyrf!"
#endext

let () = print_endline msg

$ ocamlopt -o example1 \
  -pp "cppo -x rot13:\"tr '[a-zA-Z]' '[n-za-mN-ZA-M]'\"" example1.ml

$ ./example1
OCaml rules!


2. STRINGIFY and CONCAT
=======================

STRINGIFY allows to build string literals from unquoted text. This is
useful for including source code in error messages. STRINGIFY(foo) is
the equivalent of #foo in cpp syntax.

CONCAT concatenates its two arguments into a single identifier.
CONCAT(a, b) is the equivalent of a ## b in cpp syntax.



Enjoy.


Martin

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