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52 lines
931 B
52 lines
931 B
extern crate nom;
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use nom::IResult;
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use nom::bytes::complete::{tag, take_while_m_n};
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use nom::combinator::map_res;
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use nom::sequence::tuple;
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#[derive(Debug, PartialEq)]
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pub struct Color {
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pub red: u8,
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pub green: u8,
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pub blue: u8,
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}
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fn from_hex(input: &str) -> Result<u8, std::num::ParseIntError> {
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u8::from_str_radix(input, 16)
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}
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fn is_hex_digit(c: char) -> bool {
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c.is_digit(16)
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}
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fn hex_primary(input: &str) -> IResult<&str, u8> {
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map_res(
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take_while_m_n(2, 2, is_hex_digit),
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from_hex
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)(input)
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}
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fn hex_color(input: &str) -> IResult<&str, Color> {
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let (input, _) = tag("#")(input)?;
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let (input, (red, green, blue)) = tuple((hex_primary, hex_primary, hex_primary))(input)?;
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Ok((input, Color { red, green, blue }))
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}
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#[test]
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fn parse_color() {
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assert_eq!(
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hex_color("#2F14DF"),
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Ok((
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"",
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Color {
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red: 47,
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green: 20,
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blue: 223,
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}
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))
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);
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}
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