from_ascii/
boolean.rs

1use std::fmt;
2use std::error::{Error};
3
4use base::{FromAscii};
5
6/// An error returned when parsing a `bool` from a ascii string fails.
7#[derive(Debug, Clone, PartialEq)]
8pub struct ParseBoolError {
9    kind: BoolErrorKind
10}
11
12#[derive(Debug, Clone, PartialEq)]
13enum BoolErrorKind {
14    BoolErrorKind
15}
16
17impl Error for ParseBoolError {
18    fn description(&self) -> &str {
19        "failed to parse bool"
20    }
21}
22
23impl fmt::Display for ParseBoolError {
24    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
25        "provided string was not `true` or `false`".fmt(f)
26    }
27}
28
29impl FromAscii for bool {
30    type Err = ParseBoolError;
31
32    #[inline]
33    fn from_ascii(s: &[u8]) -> Result<bool, ParseBoolError> {
34        match s {
35            b"true"  => Ok(true),
36            b"false" => Ok(false),
37            _       => Err(ParseBoolError { kind: BoolErrorKind::BoolErrorKind }),
38        }
39    }
40}
41
42#[cfg(test)]
43mod test {
44    use super::super::base::FromAscii;
45
46    #[test]
47    fn test_parse_bool() {
48        assert_eq!(bool::from_ascii(b"true"), Ok(true));
49        assert_eq!(bool::from_ascii(b"false"), Ok(false));
50        assert!(bool::from_ascii(b"").is_err());
51        assert!(bool::from_ascii(b"true ").is_err());
52        assert!(bool::from_ascii(b" false").is_err());
53    }
54}
from_ascii/boolean.rs

from_ascii/
boolean.rs
