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#[macro_use]
extern crate nom;
#[derive(Debug, PartialEq)]
pub struct Color {
pub red: u8,
pub green: u8,
pub blue: u8,
}
fn from_hex(input: &str) -> Result<u8, std::num::ParseIntError> {
u8::from_str_radix(input, 16)
}
fn is_hex_digit(c: char) -> bool {
c.is_digit(16)
}
named!(hex_primary<&str, u8>,
map_res!(take_while_m_n!(2, 2, is_hex_digit), from_hex)
);
named!(hex_color<&str, Color>,
do_parse!(
tag!("#") >>
red: hex_primary >>
green: hex_primary >>
blue: hex_primary >>
(Color { red, green, blue })
)
);
#[test]
fn parse_color() {
assert_eq!(
hex_color("#2F14DF"),
Ok((
"",
Color {
red: 47,
green: 20,
blue: 223,
}
))
);
}
|
