camlp5

Pre Processor Pretty Printer for OCaml - classical version
Objective Caml (OCaml) is an implementation of the ML language,
based on the Caml Light dialect extended with a complete
class-based object system and a powerful module system in the
style of Standard ML.
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CamlP4 is a Pre-Processor-Pretty-Printer for Objective Caml. It
offers tools for syntax (Stream Parsers and Grammars) and the
ability to modify the concrete syntax of the language
(Quotations, Syntax Extensions).
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This package contains the "classical" version of CamlP4
executables and libraries for pre-processing and pretty-printing
OCaml sources both interactively and in a batch fashion. The
"classical" version is the implementation of CamlP4 which used
to be distributed with OCaml before the release of version 3.10.