Is there a lex utility for Ada that handles unicode?

[brian.b.mcguinness@lmco.com]

Is there some equivalent of the lex utility that produces
Ada code rather than C code, and is capable of handling
any character in the Unicode basic code plane?  I am
thinking of using it on strings read from a GUI created
with GtkAda, so it would probably be best if it accepted
UTF-8 strings, but I could convert the input to a wide
string if necessary.

Thanks.

--- Brian