WHITESPACE = _{ " " }

int = @{ ASCII_NONZERO_DIGIT ~ ASCII_DIGIT* }
float = @{ int ~ "." ~ ASCII_DIGIT+ }
num = @{ float | int }

operator = _{ "+" | "-" | "*" | "/" }

expr = { term ~ (operator ~ term)* }
term = _{ num | "(" ~ expr ~ ")" }

calculation = _{ SOI ~ expr ~ EOI }