# Tokay Calc
version : 0.4

_ : Char< \t>+                         # redefine whitespace to just tab and space

Factor : @{
    Float _                            # built-in 64-bit signed float token
    Int _                              # built-in 64-bit signed int token
    '(' _ Expr Expect<')'> _
}

Term : @{
    Term '*' _ Factor     $1 * $4
    Term '/' _ Factor     $1 / $4
    Factor
}

Expr : @{
    Expr '+' _ Term       $1 + $4
    Expr '-' _ Term       $1 - $4
    Term
}


begin print("Tokay Calc " + version)   # print at startup

Expr _ print("= " + $1)                # execute each expression
'exit' exit                            # exit command
                                       # any other input, e.g. newline, is ignored