Mail Archives: djgpp/1997/02/09/12:15:47
Gunnar Beushausen wrote:
> Does anyone know how to implement optionality into a bison script?
> I'm creating a command that's called "circle" with the arguments
> x_position, y_position, radius and color. But i want color to be an
> optional argumend. My current code looks like this
>
> | circle expression expression expression expression {circle();}
>
Try:
| circle expression expression expression {circle();}
| circle expression expression expression expression {circle();}
Bison will warn you about shift/reduce conflicts, but it does not matter.
Francois
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