use crate::{Token, Tree, Val};


grammar<'s>();


pub(crate) Trees = Tree*;

Tree: Tree<'s> = {
    "(" <Trees> ")" => Tree::Branch(<>),
    Val => Tree::Leaf(<>)

}

Val: Val<'s> = {
    "@int" => Val::Int(<>),
    "@float" => Val::Float(<>),
    "@id" => Val::Ident(<>),
}


extern {
    type Location = usize;
    type Error = crate::LexError;

    enum Token<'s> {
        "(" => Token::Lparen,
        ")" => Token::Rparen,
        "@id" => Token::Ident(<&'s str>),
        "@int" => Token::Int(<i64>),
        "@float" => Token::Float(<f64>),
    }
}