termion/src/color.rs

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2016-03-07 16:39:25 +00:00
/// A terminal color.
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub enum Color {
/// Black.
Black,
/// Red.
Red,
/// Green.
Green,
/// Yellow.
Yellow,
/// Blue.
Blue,
/// Megenta.
Magenta,
/// Cyan.
Cyan,
/// White.
White,
/// High-intensity black.
HiBlack,
/// High-intensity red.
HiRed,
/// High-intensity green.
HiGreen,
/// High-intensity yellow.
HiYellow,
/// High-intensity blue.
HiBlue,
/// High-intensity megenta.
HiMagenta,
/// High-intensity cyan.
HiCyan,
/// High-intensity white.
HiWhite,
/// 216-color (r, g, b ≤ 5) RGB.
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Rgb(u8, u8, u8),
/// Grayscale (max value: 24)
Grayscale(u8),
}
use Color::*;
impl Color {
pub fn to_ansi_val(self) -> u8 {
self.debug_check();
match self {
Black => 0x0,
Red => 0x1,
Green => 0x2,
Yellow => 0x3,
Blue => 0x4,
Magenta => 0x5,
Cyan => 0x6,
White => 0x7,
HiBlack => 0x8,
HiRed => 0x9,
HiGreen => 0xA,
HiYellow => 0xB,
HiBlue => 0xC,
HiMagenta => 0xD,
HiCyan => 0xE,
HiWhite => 0xF,
Rgb(r, g, b) => 16 + 36 * r + 6 * g + b,
Grayscale(shade) => 0xE8 + shade,
}
}
fn debug_check(self) {
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match self {
Rgb(r, g, b) => {
debug_assert!(r <= 5, "Red color fragment (r = {}) is out of bound. Make sure r ≤ 5.", r);
debug_assert!(g <= 5, "Green color fragment (g = {}) is out of bound. Make sure g ≤ 5.", g);
debug_assert!(b <= 5, "Blue color fragment (b = {}) is out of bound. Make sure b ≤ 5.", b);
},
Grayscale(shade) => {
// Unfortunately, there are a little less than fifty shades.
debug_assert!(shade < 24, "Grayscale out of bound (shade = {}). There are only 24 shades of gray.", shade);
},
_ => {},
}
}
}