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Re: How do I get regexp from expect at gdb_expect?
- From: Daniel Jacobowitz <drow at false dot org>
- To: GDB <gdb at sources dot redhat dot com>
- Date: Mon, 31 Jan 2005 22:52:36 -0500
- Subject: Re: How do I get regexp from expect at gdb_expect?
- References: <20050129025743.GA4053@white> <200501290309.j0T39F1i020834@tully.CS.Berkeley.EDU> <20050131150652.GA7955@white> <20050131162609.GA19459@nevyn.them.org> <20050131211042.GA8411@white> <20050131212122.GA10092@nevyn.them.org> <20050131220050.GB8411@white> <20050131220354.GA11955@nevyn.them.org> <20050131221247.GC8411@white>
On Mon, Jan 31, 2005 at 05:12:47PM -0500, Bob Rossi wrote:
> On Mon, Jan 31, 2005 at 05:03:54PM -0500, Daniel Jacobowitz wrote:
> > On Mon, Jan 31, 2005 at 05:00:50PM -0500, Bob Rossi wrote:
> > > It also tighten's up the MI output command matching, I honestly don't
> > > know how the -break-delete was getting eaten in the regular expression,
> > > unless $pattern happened to have a .*. Oops, in that case, I guess we
> > > aren't really validation much, anything could have come out of GDB, and
> > > it probably would have passed.
> >
> > Your pattern doesn't start with an anchor. -break-delete wasn't eaten;
> > we just started matching after it.
>
> Please forgive my ignorance, I've been reading online as much as
> possible to understand tcl/expect ...
>
> I understand how anchors work, however, I didn't realize you could start
> matching in the middle of what the 'buffer' is. If it started matching
> after it, does that mean it's skipped forever? So basically, you can
> match a subset of the output, and the rest is lost (never matched)?
That's correct.
> If that's the case, the testsuite for the MI is matching even less than
> I thought. GDB could output almost anything, but then just have to match
> the last string, and the testcase would pass, correct?
Yes. Sometimes this is even deliberate - fixing it would be
interesting, but probably quite hard.
--
Daniel Jacobowitz