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