Hi all,
Imagine I have an expression grammar that has to deal with the following
expression:
age > 10 && < 20
When finding the above input, the grammar has to rewrite that into:
age > 10 && age < 20
My expression grammar is a typical expression grammar otherwise, but for
simplification lets imagine it is like this:
relationalExpression : operand (operator^ operand)*
operand : // will match the "age" token above;
operator: // will match operators, like the > and < above;
And then I have my "and" rule where I need to use the rewrite:
andRule : relationalExpression ( '&&' operator operand )*;
I tried the following:
andRule :
scope { CommonTree se1 = null; }
( relationalExpression -> relationalExpression )
( ( '&&' op=operator se2=operand ) -> ^('&&' $andRule ^( $op $se1 $se2 )
)*;
And then setting se1 in the relational expression, but the rewrite rule
does not allow me to reference $se1. I am probably over-thinking this, but
any help would be greatly appreciated. BTW, the "operand" is actually
several calls down in the real grammar... above is just a simplified
snippet, but the problem is the same.
Thanks,
Edson
--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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