Why is a custom SyntaxNode subclass not working with parentheses?

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Apr 27, 2016, 5:25:39 PM4/27/16

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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?

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