rusty_money/
error.rs

1use std::{error, fmt};
2
3/// Standard Error type for this crate.
4#[derive(Debug, PartialEq, Clone)]
5pub enum MoneyError {
6    InvalidCurrency,
7    InvalidAmount,
8    InvalidRatio,
9    /// Returned when arithmetic or comparison is attempted between different currencies.
10    CurrencyMismatch {
11        expected: &'static str,
12        actual: &'static str,
13    },
14    /// Returned when division by zero is attempted.
15    DivisionByZero,
16    /// Returned when an arithmetic operation overflows.
17    Overflow,
18    /// Returned when converting to FastMoney would lose precision.
19    PrecisionLoss,
20}
21
22impl fmt::Display for MoneyError {
23    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
24        match self {
25            MoneyError::InvalidCurrency => write!(f, "Currency was not valid"),
26            MoneyError::InvalidAmount => write!(f, "Amount not parsable"),
27            MoneyError::InvalidRatio => write!(f, "Ratio was not valid"),
28            MoneyError::CurrencyMismatch { expected, actual } => {
29                write!(
30                    f,
31                    "Currency mismatch: expected {}, got {}",
32                    expected, actual
33                )
34            }
35            MoneyError::DivisionByZero => write!(f, "Division by zero"),
36            MoneyError::Overflow => write!(f, "Arithmetic overflow"),
37            MoneyError::PrecisionLoss => write!(f, "Conversion would lose precision"),
38        }
39    }
40}
41
42impl error::Error for MoneyError {
43    fn description(&self) -> &str {
44        match self {
45            MoneyError::InvalidCurrency => "Currency was not valid",
46            MoneyError::InvalidAmount => "Amount not parsable",
47            MoneyError::InvalidRatio => "Ratio was not valid",
48            MoneyError::CurrencyMismatch { .. } => "Currency mismatch",
49            MoneyError::DivisionByZero => "Division by zero",
50            MoneyError::Overflow => "Arithmetic overflow",
51            MoneyError::PrecisionLoss => "Conversion would lose precision",
52        }
53    }
54}
55
56impl From<std::num::ParseIntError> for MoneyError {
57    fn from(_err: std::num::ParseIntError) -> MoneyError {
58        MoneyError::InvalidAmount
59    }
60}
rusty_money/error.rs

rusty_money/
error.rs
