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use std::error;
use std::fmt;
use std::result;
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug)]
pub struct Error {
kind: Kind,
message: &'static str,
}
impl Error {
pub(crate) fn new(kind: Kind, message: &'static str) -> Error {
Error { kind, message }
}
}
#[derive(Debug)]
pub enum Kind {
EmptyString,
OutOfRange,
InvalidDigit(usize, u8),
CheckDigitUnsupported(usize, u8),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.kind {
Kind::InvalidDigit(idx, digit) => {
write!(f, "{} Byte value {} at index {}", self.message, digit, idx)
}
_ => write!(f, "{}", self.message),
}
}
}
impl error::Error for Error {}
#[cfg(test)]
impl PartialEq for Error {
fn eq(&self, other: &Error) -> bool {
fn kind_value(kind: &Kind) -> i32 {
match *kind {
Kind::EmptyString => 1,
Kind::OutOfRange => 2,
Kind::InvalidDigit(..) => 3,
Kind::CheckDigitUnsupported(..) => 4,
}
}
kind_value(&self.kind) == kind_value(&other.kind)
}
}