[m-dev.] Proposal: parsing module for the library.

[Ralph Becket]

Julien Fischer, Thursday, 15 January 2009:
> 
> On Tue, 13 Jan 2009, Ralph Becket wrote:
> 
> >Here's a diff addressing most of the review comments:
> >
> >--- parsing.m	2009-01-13 16:52:32.206161260 +1100
> >+++ parsing_utils.m	2009-01-13 16:59:03.720192432 +1100
> >@@ -1,14 +1,14 @@
> >%-----------------------------------------------------------------------------%
> >-% parsing.m
> >+% parsing_utils.m
> >% Ralph Becket <rafe at csse.unimelb.edu.au>
> >% Tue Jan 13 11:32:49 EST 2009
> >% vim: ft=mercury ts=4 sw=4 et wm=0 tw=0
> >%
> >-% Support for DCG style parsers.
> >+% Utilities for recursive descent parsers.
> >%
> >%-----------------------------------------------------------------------------%
> 
> You should use the the same style of header comment used in the rest of
> the stdlib.
> 
> It looks fine to me otherwise , although you will need to add samples and
> tests, update library/library.m and the NEWS file etc as well.

Another question: the parser(T) type and parser inst are useful for
higher order parser signatures, but I think using

:- pred p(src::in, ...)
	: parser(T) `with_inst` parser

on other predicate signatures is less clear than simply writing

:- pred p(src::in, ..., T::out, ps::in, ps::out) is semidet.

Any opinion on that one?
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