bugPLY (Python Lex-Yacc) - Bugs: bug #2438, shift to empty.

 
 

bug #2438: shift to empty.

Submitted by:  None
Submitted on:  Sat 01 Feb 2003 04:30:26 AM UTC  
 
Category: NoneSeverity: 3 - Normal
Item Group: NoneStatus: None
Privacy: PublicAssigned to: None
Open/Closed: Open

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Sat 01 Feb 2003 04:50:21 AM UTC, comment #1:

I will need a specific example in order to track down the problem empties. Suggest looking at the CHANGES file to see if this yields any clues.

David Beazley <beazley>
Project Administrator
Sat 01 Feb 2003 04:30:26 AM UTC, original submission:

hi - my grammar that works with 1.1 fails with 1.3. The grammar is littered with empties. It appears that 1.3 implicity inserts all tokens when it sees an empty (which is fair, to account for all possible tokens), and then reduces to one of these instead of shifting the real matching token.

This only occurs on one of my grammar files (a MIB compiler) which is huge, complex and a killer to debug.

Also, there seems to be an subtle problem with recursion detection.. When a rule is missing (typo, etc) it thinks its recursive.

Jim..

Anonymous

 

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