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

 
 

bug #2438: shift to empty.

Submitter:  None
Submitted:  Sat 01 Feb 2003 04:30:26 AM UTC
   
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned 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>
Group 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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