css.rs

#[macro_use]
extern crate nom;

use nom::is_hex_digit;

#[derive(Debug,PartialEq)]
pub struct Color {
  pub red:   u8,
  pub green: u8,
  pub blue:  u8,
}

named!(hex_primary<u8>,
  flat_map!(take_while_m_n!(2, 2, is_hex_digit), parse_to!(u8))
);

named!(hex_color<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(&b"#2F14DF"[..]), Ok((&b""[..], Color {
    red: 47,
    green: 20,
    blue: 223,
  })));
}