How to use the SQL parser subsystem

Hi.

Is it possible to use the SQL parser embedded inside the postgres code via
some public API?
I wish to get a parsed SQL query in any format which lends itself to easy
analysis (structural, for example) so as to be able to find similarities
between queries.

I tried peeking around a bit, and tried pulling out src/backend/parser - but
that depends on other parts of the code, making it a bit non-trivial. Plus,
any changes in the base code upstream would not be available to this
pulled-out application over time. Looking further, I noticed on my Fedora
distribution that the pg devel package has a parser/parser.h file which
exposes the function 'raw_parser' which is the function that seemed most
interesting to me while exploring the code too.

I have some questions:
1] is 'raw_parser' the right function to parse an SQL statement (for mainly
structural/syntactic analysis)?
2] If yes, I found that none of the shared library files expose this
function - I could not link a simple C program with this function
successfully. (I tried all the .so files related to postgres! :-()
3] If not, what would be a better mechanism to re-use all the work already
done in postgres for SQL analysis?

regards,
jaju