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Diffstat (limited to 'CHANGES')
| -rw-r--r-- | CHANGES | 20 |
1 files changed, 16 insertions, 4 deletions
@@ -1,6 +1,18 @@ Version 2.4 ----------------------------- 05/04/08: beazley + A version number is now embedded in the table file signature so that + yacc can more gracefully accomodate changes to the output format + in the future. + +05/04/08: beazley + Removed undocumented .pushback() method on grammar productions. I'm + not sure this ever worked and can't recall ever using it. Might have + been an abandoned idea that never really got fleshed out. This + feature was never described or tested so removing it is hopefully + harmless. + +05/04/08: beazley Added extra error checking to yacc() to detect precedence rules defined for undefined terminal symbols. This allows yacc() to detect a potential problem that can be really tricky to debug if no warning message or error @@ -103,15 +115,15 @@ Version 2.4 11/27/07: beazley Added the ability to put the parser into error-handling mode - from within a normal production. To do this, simply call - the .error() method like this: + from within a normal production. To do this, simply raise + a yacc.SyntaxError exception like this: def p_some_production(p): 'some_production : prod1 prod2' ... - p.error() # Signal an error + raise yacc.SyntaxError # Signal an error - A number of things happen after error() has been called. + A number of things happen after this occurs: - The last symbol shifted onto the symbol stack is discarded and parser state backed up to what it was before the |