mod operator;
mod function;
mod evaluate;

pub use self::evaluate::evaluate;

#[derive(Debug)]
pub enum EvalError {
	BadMath,
	TooBig,
	ZeroDivision,
	IncompatibleUnit,
	BadDefineName
}


impl ToString for EvalError {
	fn to_string(&self) -> String {
		match self {
			EvalError::BadMath => {
				String::from("Failed to evaluate expression")
			},
			EvalError::TooBig => {
				String::from("Number too big")
			},
			EvalError::ZeroDivision => {
				String::from("Division by zero")
			},
			EvalError::IncompatibleUnit => {
				String::from("Incompatible units")
			},
			EvalError::BadDefineName => {
				String::from("Invalid variable name")
			}
		}
	}
}