Parsing Ada?

[Jacob Sparre Andersen <sparre@nbi.dk>]

I have a project, which requires that I write/generate a parser for an
Ada subset:

+ Only package specifications.
+ No use clauses.
+ No type, object or function declarations (only procedures).
+ Procedures can only have "in" parameters.

I have attempted to use OpenToken to do the parsing, and although it
seems to work fine as a parser, the options for extracting information
from the parse tree are too limited (or maybe I just can't understand
the documentation).

I'm not that fond of generating the parser on-the-fly every time I run
my program.  I would prefer to compile the grammar to Ada source text,
which I then could compile into the program.

What open source parsers/parser generators are there for use in Ada
programs?  And what are your experiences with them?

So far I've found:

+ OpenToken
+ AdaGOOP
+ ayacc

Greetings,

Jacob
-- 
"It is very easy to get ridiculously confused about the
 tenses of time travel, but most things can be resolved
 by a sufficiently large ego."