gnubol: Recovery

[RKRayhawk@aol.com]

I have a quetion.  Does anyone know how to get the line number of the 
lookahead token?

My guess is that when a nasty dangling unterminated condtional is being 
recursed that, should we want to we can build a tree that represents its 
various open levels. As we get to the reduction of the problem child we 
might, if we have so designed, have that tree available for walking.

If we then walk we can say that at each line S, an open conditional started 
that did not end explicitly so we are ending it implicitly. The thing that 
ends the problem is the lookahead, which is not quite here in the current 
rule. Can we get the line number of the lookahead that is precipitating the 
multiple reductions.  So that we can say the implied terminator was assumed 
at line T, (which line T is the line number of the lookahead token)? Where 
would a lexer have been able to put that? is there any chance that (speaking 
bison here) a hyper extended $n can reference a YYSTYPE with the line number 
in tow? even though it is the lookahead.  Can we ever get to the lookahead 
with $n?

Bob Rayhawk


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