I did some checking and there is indeed a bug in ply-2.5. In practice, this
bug is unlikely to affect most users since it pertains to a relatively obscure
feature.
However, I have made a fix and added a unit test for it in the PLY subversion
repository. If you check out the most recent version, it should be fixed.
On the subject of bug fixes, I would like to put out a new PLY release by the
end of the year. So, if anyone has any bug fixes or suggestions for
improvement, please
let me know. Normally I would have done this earlier, but I've been a little
sidetracked working on the 4th edition of the Python Essential Reference book
(shameless
plug :-).
Cheers,
Dave
On Tue 04/11/08 9:56 AM , David Beazley [EMAIL PROTECTED] sent:
>
> Hmmm. I'm don't know off the top of my head why there would be a
> difference, but I'll definitely check into it along with a few other thing
> for the PLY-2.6 release.
> Cheers,
> Dave
>
>
> On Tue 04/11/08 7:05 AM , apwaters apwat
> [EMAIL PROTECTED] sent:>
> > In attempting to upgrade from version 2.3 to 2.5
> of Ply I found a> difference which does not seem to be mentioned
> in the documentation.>
> > Running the code below produces a different
> answer on 2.3 and 2.5. On> 2.3 it prints A, on 2.5 it prints B. Reading the
> documentation implies> that 2.3 is correct and 2.5 is wrong.
> >
> > from ply import lex, yacc
> >
> > t_A = 'A'
> > t_B = 'B'
> > t_C = 'C'
> >
> > tokens = ('A', 'B', 'C')
> >
> > the_lexer = lex.lex()
> >
> > def p_start(t):
> > '''start : A nest C'''
> >
> > def p_nest(t):
> > '''nest : B'''
> > print t[-1]
> >
> > the_parser = yacc.yacc(debug = False,
> write_tables = False)>
> > the_parser.parse('ABC', the_lexer)
> >
> >
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