camlp4

Pre Processor Pretty Printer for OCaml
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 basic CamlP4 executables and libraries
for pre-processing and pretty-printing OCaml sources both
interactively and in a batch fashion.