use crate::Tree;

grammar<'s>();


pub Tree: Tree = {
    "(" "+" <Tree*> ")" => Tree::Add(<>),
    "(" "-" <Tree+> ")" => Tree::Sub(<>),
    "(" "*" <Tree*> ")" => Tree::Mul(<>),
    "(" "/" <Tree+> ")" => Tree::Div(<>),
    r"[0-9]+(\.[0-9]+)?" => Tree::Val(<>.parse().unwrap()),
}