colors

src/color.zig

@@ -0,0 +1,49 @@
+const std = @import("std");
+const fmt = std.fmt;
+
+pub const RGB = struct {
+    r: u8,
+    g: u8,
+    b: u8,
+
+    pub fn init(comptime string: []const u8) !RGB {
+        std.debug.assert(string.len == 6 or string.len == 7);
+        comptime var index: usize = 0;
+        if (string[0] == '#') index += 1;
+        return .{
+            .r = try fmt.parseInt(u8, string[index .. index + 2], 16),
+            .g = try fmt.parseInt(u8, string[index + 2 .. index + 4], 16),
+            .b = try fmt.parseInt(u8, string[index + 4 .. index + 6], 16),
+        };
+    }
+};
+
+// pub const Default256 = [_]RGB{
+//     RGB{ .r = 0, .g = 0, .b = 0 },
+//     RGB{ .r = 204, .g = 4, .b = 3 },
+//     RGB{ .r = 25, .g = 203, .b = 0 },
+//     RGB{ .r = 206, .g = 203, .b = 0 },
+//     RGB{ .r = 13, .g = 115, .b = 204 },
+//     RGB{ .r = 203, .g = 30, .b = 209 },
+//     RGB{ .r = 13, .g = 205, .b = 205 },
+//     RGB{ .r = 221, .g = 221, .b = 221 },
+// };
+
+test "RGB init from string" {
+    const red = try RGB.init("#ff0000");
+    try std.testing.expectEqual(0xff, red.r);
+    try std.testing.expectEqual(0x00, red.g);
+    try std.testing.expectEqual(0x00, red.b);
+
+    const green = try RGB.init("00ff00");
+    try std.testing.expectEqual(0x00, green.r);
+    try std.testing.expectEqual(0xff, green.g);
+    try std.testing.expectEqual(0x00, green.b);
+
+    const blue = try RGB.init("#0000ff");
+    try std.testing.expectEqual(0x00, blue.r);
+    try std.testing.expectEqual(0x00, blue.g);
+    try std.testing.expectEqual(0xff, blue.b);
+
+    try std.testing.expectError(fmt.ParseIntError.InvalidCharacter, RGB.init("xyzxyz"));
+}