| use nom8::bytes::{tag, take_while_m_n}; |
| use nom8::prelude::*; |
| |
| #[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) |
| } |
| |
| fn hex_primary(input: &str) -> IResult<&str, u8> { |
| take_while_m_n(2, 2, is_hex_digit) |
| .map_res(from_hex) |
| .parse(input) |
| } |
| |
| fn hex_color(input: &str) -> IResult<&str, Color> { |
| let (input, _) = tag("#")(input)?; |
| let (input, (red, green, blue)) = (hex_primary, hex_primary, hex_primary).parse(input)?; |
| |
| Ok((input, Color { red, green, blue })) |
| } |
| |
| #[test] |
| fn parse_color() { |
| assert_eq!( |
| hex_color("#2F14DF"), |
| Ok(( |
| "", |
| Color { |
| red: 47, |
| green: 20, |
| blue: 223, |
| } |
| )) |
| ); |
| } |