I have a treetop grammar like below:
grammar Addme
rule AddExpr
Num '+' Num
end
rule Num
[0-9]+ <ExprNumber>
end
end
This is working when I parse the expression:
g = AddmeParser.new
t = g.parse("1234+56789")
. . . there is a syntax node that matches "1234"
with type ExprNumber
. But, if I add parentheses to the rule like this:
rule Num
([0-9]+) <ExprNumber>
end
It will not match the class ExprNumber
. Why would this happen?
The node has already been created inside the parentheses. A module can be mixed in, but not a class.
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