func evalOp(opName string, decimals *DecimalStack) error {
op := operators.FindOperatorFromString(opName)
if op == nil {
return errors.New("Either unmatched paren or unrecognized operator")
}
var args = make([]decimal.Decimal, op.Args)
for i := op.Args - 1; i >= 0; i-- {
arg, err := decimals.Pop()
if err != nil {
return errors.New("Not enough arguments to operator!")
}
args[i] = arg
}
decimals.Push(op.Operation(args))
return nil
}
func parseOperator(lit string) *operators.Operator {
return operators.FindOperatorFromString(lit)
}