65 lines
1.4 KiB
Rust
65 lines
1.4 KiB
Rust
#[derive(Clone, Debug, Eq, PartialEq)]
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pub struct Colour {
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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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#[derive(Debug)]
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pub struct InvalidRgb;
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impl Colour {
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pub(crate) fn from(string: &str) -> Result<Colour, InvalidRgb> {
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let values: Vec<&str> = string.trim_matches(',').split(',').collect();
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if values.len() != 3 {
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return Err(InvalidRgb);
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}
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let red: u8 = values[0].parse().unwrap_or(0);
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let green: u8 = values[1].parse().unwrap_or(0);
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let blue: u8 = values[2].parse().unwrap_or(0);
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Ok(Colour { red, green, blue })
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}
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}
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impl ToString for Colour {
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fn to_string(&self) -> String {
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format!("{},{},{}", self.red, self.green, self.blue)
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}
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}
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#[cfg(test)]
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mod test {
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use crate::colour::Colour;
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#[test]
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fn colour_from_string() {
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assert_eq!(
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Colour::from("0,255,0").unwrap(),
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Colour { red: 0, green: 255, blue: 0 }
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);
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}
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#[test]
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fn colour_to_string() {
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assert_eq!(Colour { red: 22, green: 33, blue: 44, }.to_string(), "22,33,44".to_string());
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}
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#[test]
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fn colour_missing_value() {
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assert!(Colour::from("0,0").is_err());
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}
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#[test]
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fn colour_ambiguous_value() {
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assert!(Colour::from("0,0,").is_err());
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}
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#[test]
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fn colour_extraneous_value() {
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assert!(Colour::from("0,0,0,0").is_err());
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}
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}
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