culors 1.6.0

//! CSS named color table.
//!
//! 148 entries lifted verbatim from culori 4.0.2
//! (`node_modules/culori/src/colors/named.js`). Lookup is case-insensitive
//! (callers lowercase the input first); `transparent` is handled separately
//! by the parse dispatcher because it carries an explicit alpha of 0.

/// Returns the 24-bit packed RGB value for the given lowercase CSS color
/// name, or `None` if unknown.
pub(crate) fn lookup(name: &str) -> Option<u32> {
    NAMED
        .binary_search_by(|probe| probe.0.cmp(name))
        .ok()
        .map(|i| NAMED[i].1)
}

/// Sorted list of (name, 24-bit RGB) pairs from culori's `named.js`.
/// Keeping it sorted lets us use `binary_search_by`.
const NAMED: &[(&str, u32)] = &[
    ("aliceblue", 0xf0f8ff),
    ("antiquewhite", 0xfaebd7),
    ("aqua", 0x00ffff),
    ("aquamarine", 0x7fffd4),
    ("azure", 0xf0ffff),
    ("beige", 0xf5f5dc),
    ("bisque", 0xffe4c4),
    ("black", 0x000000),
    ("blanchedalmond", 0xffebcd),
    ("blue", 0x0000ff),
    ("blueviolet", 0x8a2be2),
    ("brown", 0xa52a2a),
    ("burlywood", 0xdeb887),
    ("cadetblue", 0x5f9ea0),
    ("chartreuse", 0x7fff00),
    ("chocolate", 0xd2691e),
    ("coral", 0xff7f50),
    ("cornflowerblue", 0x6495ed),
    ("cornsilk", 0xfff8dc),
    ("crimson", 0xdc143c),
    ("cyan", 0x00ffff),
    ("darkblue", 0x00008b),
    ("darkcyan", 0x008b8b),
    ("darkgoldenrod", 0xb8860b),
    ("darkgray", 0xa9a9a9),
    ("darkgreen", 0x006400),
    ("darkgrey", 0xa9a9a9),
    ("darkkhaki", 0xbdb76b),
    ("darkmagenta", 0x8b008b),
    ("darkolivegreen", 0x556b2f),
    ("darkorange", 0xff8c00),
    ("darkorchid", 0x9932cc),
    ("darkred", 0x8b0000),
    ("darksalmon", 0xe9967a),
    ("darkseagreen", 0x8fbc8f),
    ("darkslateblue", 0x483d8b),
    ("darkslategray", 0x2f4f4f),
    ("darkslategrey", 0x2f4f4f),
    ("darkturquoise", 0x00ced1),
    ("darkviolet", 0x9400d3),
    ("deeppink", 0xff1493),
    ("deepskyblue", 0x00bfff),
    ("dimgray", 0x696969),
    ("dimgrey", 0x696969),
    ("dodgerblue", 0x1e90ff),
    ("firebrick", 0xb22222),
    ("floralwhite", 0xfffaf0),
    ("forestgreen", 0x228b22),
    ("fuchsia", 0xff00ff),
    ("gainsboro", 0xdcdcdc),
    ("ghostwhite", 0xf8f8ff),
    ("gold", 0xffd700),
    ("goldenrod", 0xdaa520),
    ("gray", 0x808080),
    ("green", 0x008000),
    ("greenyellow", 0xadff2f),
    ("grey", 0x808080),
    ("honeydew", 0xf0fff0),
    ("hotpink", 0xff69b4),
    ("indianred", 0xcd5c5c),
    ("indigo", 0x4b0082),
    ("ivory", 0xfffff0),
    ("khaki", 0xf0e68c),
    ("lavender", 0xe6e6fa),
    ("lavenderblush", 0xfff0f5),
    ("lawngreen", 0x7cfc00),
    ("lemonchiffon", 0xfffacd),
    ("lightblue", 0xadd8e6),
    ("lightcoral", 0xf08080),
    ("lightcyan", 0xe0ffff),
    ("lightgoldenrodyellow", 0xfafad2),
    ("lightgray", 0xd3d3d3),
    ("lightgreen", 0x90ee90),
    ("lightgrey", 0xd3d3d3),
    ("lightpink", 0xffb6c1),
    ("lightsalmon", 0xffa07a),
    ("lightseagreen", 0x20b2aa),
    ("lightskyblue", 0x87cefa),
    ("lightslategray", 0x778899),
    ("lightslategrey", 0x778899),
    ("lightsteelblue", 0xb0c4de),
    ("lightyellow", 0xffffe0),
    ("lime", 0x00ff00),
    ("limegreen", 0x32cd32),
    ("linen", 0xfaf0e6),
    ("magenta", 0xff00ff),
    ("maroon", 0x800000),
    ("mediumaquamarine", 0x66cdaa),
    ("mediumblue", 0x0000cd),
    ("mediumorchid", 0xba55d3),
    ("mediumpurple", 0x9370db),
    ("mediumseagreen", 0x3cb371),
    ("mediumslateblue", 0x7b68ee),
    ("mediumspringgreen", 0x00fa9a),
    ("mediumturquoise", 0x48d1cc),
    ("mediumvioletred", 0xc71585),
    ("midnightblue", 0x191970),
    ("mintcream", 0xf5fffa),
    ("mistyrose", 0xffe4e1),
    ("moccasin", 0xffe4b5),
    ("navajowhite", 0xffdead),
    ("navy", 0x000080),
    ("oldlace", 0xfdf5e6),
    ("olive", 0x808000),
    ("olivedrab", 0x6b8e23),
    ("orange", 0xffa500),
    ("orangered", 0xff4500),
    ("orchid", 0xda70d6),
    ("palegoldenrod", 0xeee8aa),
    ("palegreen", 0x98fb98),
    ("paleturquoise", 0xafeeee),
    ("palevioletred", 0xdb7093),
    ("papayawhip", 0xffefd5),
    ("peachpuff", 0xffdab9),
    ("peru", 0xcd853f),
    ("pink", 0xffc0cb),
    ("plum", 0xdda0dd),
    ("powderblue", 0xb0e0e6),
    ("purple", 0x800080),
    ("rebeccapurple", 0x663399),
    ("red", 0xff0000),
    ("rosybrown", 0xbc8f8f),
    ("royalblue", 0x4169e1),
    ("saddlebrown", 0x8b4513),
    ("salmon", 0xfa8072),
    ("sandybrown", 0xf4a460),
    ("seagreen", 0x2e8b57),
    ("seashell", 0xfff5ee),
    ("sienna", 0xa0522d),
    ("silver", 0xc0c0c0),
    ("skyblue", 0x87ceeb),
    ("slateblue", 0x6a5acd),
    ("slategray", 0x708090),
    ("slategrey", 0x708090),
    ("snow", 0xfffafa),
    ("springgreen", 0x00ff7f),
    ("steelblue", 0x4682b4),
    ("tan", 0xd2b48c),
    ("teal", 0x008080),
    ("thistle", 0xd8bfd8),
    ("tomato", 0xff6347),
    ("turquoise", 0x40e0d0),
    ("violet", 0xee82ee),
    ("wheat", 0xf5deb3),
    ("white", 0xffffff),
    ("whitesmoke", 0xf5f5f5),
    ("yellow", 0xffff00),
    ("yellowgreen", 0x9acd32),
];

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn table_is_sorted() {
        for pair in NAMED.windows(2) {
            assert!(
                pair[0].0 < pair[1].0,
                "not sorted: {} >= {}",
                pair[0].0,
                pair[1].0
            );
        }
    }

    #[test]
    fn known_colors() {
        assert_eq!(lookup("red"), Some(0xff0000));
        assert_eq!(lookup("cornflowerblue"), Some(0x6495ed));
        assert_eq!(lookup("rebeccapurple"), Some(0x663399));
        assert_eq!(lookup("yellowgreen"), Some(0x9acd32));
    }

    #[test]
    fn unknown_returns_none() {
        assert_eq!(lookup("notacolor"), None);
        assert_eq!(lookup(""), None);
        assert_eq!(lookup("RED"), None); // caller must lowercase
    }

    #[test]
    fn entry_count() {
        assert_eq!(NAMED.len(), 148);
    }
}