Hmmm. It's hard to say for certain. However, I just tested the calculator
example with an added power operator (right precedence) and it worked
correctly. There are some debugging modes for yacc.parse() that might be
worth investigating here.
http://www.dabeaz.com/ply/ply.html#ply_nn46
Cheers,
Dave
On Nov 23, 2009, at 7:26 PM, Alex_Gaynor wrote:
> I've got a grammar with precedence:
>
> precedence = (
> ("nonassoc", "COMPARISON"),
> ("left", "AMPER", "VBAR", "CIRCUMFLEX"),
> ("left", "PLUS", "MINUS"),
> ("left", "STAR", "SLASH", "PERCENT"),
> ("right", "UNARY"),
> ("right", "POWER"),
> )
>
> Which I believe is correct. However given: a ** b ** c; it parses it
> as:
> [('BinOpNode', ('BinOpNode', ('NameNode', 'a'), ('NameNode', 'b'),
> '**'), ('NameNode', 'c'), '**')]
>
> Whereas I would expect:
> [('BinOpNode', ('NameNode', 'a'), ('BinOpNode', ('NameNode', 'b'),
> ('NameNode', 'c'), '**'), '**')]
>
> Hopefully that syntax is clear. Any suggestions as to why I'm getting
> an incorrect parse.
>
> Alex
>
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