| #[macro_use] |
| extern crate nom; |
| |
| use nom::character::streaming::digit1 as digit; |
| |
| use std::str; |
| use std::str::FromStr; |
| |
| named!( |
| unsigned_float<f32>, |
| map_res!( |
| map_res!( |
| recognize!(alt!( |
| delimited!(digit, tag!("."), opt!(digit)) | delimited!(opt!(digit), tag!("."), digit) |
| )), |
| str::from_utf8 |
| ), |
| FromStr::from_str |
| ) |
| ); |
| |
| named!( |
| float<f32>, |
| map!( |
| pair!(opt!(alt!(tag!("+") | tag!("-"))), unsigned_float), |
| |(sign, value): (Option<&[u8]>, f32)| sign |
| .and_then(|s| if s[0] == b'-' { Some(-1f32) } else { None }) |
| .unwrap_or(1f32) * value |
| ) |
| ); |
| |
| #[test] |
| fn unsigned_float_test() { |
| assert_eq!(unsigned_float(&b"123.456;"[..]), Ok((&b";"[..], 123.456))); |
| assert_eq!(unsigned_float(&b"0.123;"[..]), Ok((&b";"[..], 0.123))); |
| assert_eq!(unsigned_float(&b"123.0;"[..]), Ok((&b";"[..], 123.0))); |
| assert_eq!(unsigned_float(&b"123.;"[..]), Ok((&b";"[..], 123.0))); |
| assert_eq!(unsigned_float(&b".123;"[..]), Ok((&b";"[..], 0.123))); |
| } |
| |
| #[test] |
| fn float_test() { |
| assert_eq!(float(&b"123.456;"[..]), Ok((&b";"[..], 123.456))); |
| assert_eq!(float(&b"+123.456;"[..]), Ok((&b";"[..], 123.456))); |
| assert_eq!(float(&b"-123.456;"[..]), Ok((&b";"[..], -123.456))); |
| } |
