1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
use std::error::Error as ErrorTrait;
use std::fmt;
pub type Result<T> = ::std::result::Result<T, Error>;
const ALPHABET_LENGTH_MESSAGE: &str =
"The provided alphabet does not contain enough unique characters";
const ILLEGAL_CHARACTER_MESSAGE: &str = "The provided alphabet contains an illegal character";
const SEPARATOR_MESSAGE: &str =
"The provided separators contain a character not found in the alphabet";
#[derive(Debug)]
pub enum Error {
AlphabetLength,
IllegalCharacter(char),
Separator,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::AlphabetLength => write!(f, "{}", ALPHABET_LENGTH_MESSAGE),
Error::IllegalCharacter(c) => write!(f, "{} ({})", ILLEGAL_CHARACTER_MESSAGE, c),
Error::Separator => write!(f, "{}", SEPARATOR_MESSAGE),
}
}
}
impl ErrorTrait for Error {
fn description(&self) -> &str {
match *self {
Error::AlphabetLength => ALPHABET_LENGTH_MESSAGE,
Error::IllegalCharacter(_) => ILLEGAL_CHARACTER_MESSAGE,
Error::Separator => SEPARATOR_MESSAGE,
}
}
}