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term: parse hex color string for OSC commands

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This commit is contained in:
Gregory Anders
2023-12-12 09:40:51 -06:00
parent e5acb082c1
commit 2da05a6d5c
1 changed files with 36 additions and 10 deletions
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46
src/terminal/color.zig
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@ -181,23 +181,42 @@ pub const RGB = struct {
return @intCast(@as(usize, color) * std.math.maxInt(u8) / divisor);
}
/// Parse a color specification of the form
/// Parse a color specification.
///
/// rgb:<red>/<green>/<blue>
/// Any of the following forms are accepted:
///
/// <red>, <green>, <blue> := h | hh | hhh | hhhh
/// 1. rgb:<red>/<green>/<blue>
///
/// where `h` is a single hexadecimal digit.
/// <red>, <green>, <blue> := h | hh | hhh | hhhh
///
/// Alternatively, the form
/// where `h` is a single hexadecimal digit.
///
/// rgbi:<red>/<green>/<blue>
/// 2. rgbi:<red>/<green>/<blue>
///
/// where <red>, <green>, and <blue> are floating point values between 0.0
/// and 1.0 (inclusive) is also accepted.
/// where <red>, <green>, and <blue> are floating point values between
/// 0.0 and 1.0 (inclusive).
///
/// 3. #hhhhhh
///
/// where `h` is a single hexadecimal digit.
pub fn parse(value: []const u8) !RGB {
const minimum_length = "rgb:a/a/a".len;
if (value.len < minimum_length or !std.mem.eql(u8, value[0..3], "rgb")) {
if (value.len == 0) {
return error.InvalidFormat;
}
if (value[0] == '#') {
if (value.len != 7) {
return error.InvalidFormat;
}
return RGB{
.r = try RGB.fromHex(value[1..3]),
.g = try RGB.fromHex(value[3..5]),
.b = try RGB.fromHex(value[5..7]),
};
}
if (value.len < "rgb:a/a/a".len or !std.mem.eql(u8, value[0..3], "rgb")) {
return error.InvalidFormat;
}
@ -271,6 +290,8 @@ test "RGB.parse" {
try testing.expectEqual(RGB{ .r = 255, .g = 0, .b = 0 }, try RGB.parse("rgbi:1.0/0/0"));
try testing.expectEqual(RGB{ .r = 127, .g = 160, .b = 0 }, try RGB.parse("rgb:7f/a0a0/0"));
try testing.expectEqual(RGB{ .r = 255, .g = 255, .b = 255 }, try RGB.parse("rgb:f/ff/fff"));
try testing.expectEqual(RGB{ .r = 255, .g = 255, .b = 255 }, try RGB.parse("#ffffff"));
try testing.expectEqual(RGB{ .r = 255, .g = 0, .b = 16 }, try RGB.parse("#ff0010"));
// Invalid format
try testing.expectError(error.InvalidFormat, RGB.parse("rgb;"));
@ -283,4 +304,9 @@ test "RGB.parse" {
try testing.expectError(error.InvalidFormat, RGB.parse("rgbi:a/a/a"));
try testing.expectError(error.InvalidFormat, RGB.parse("rgb:0.5/0.0/1.0"));
try testing.expectError(error.InvalidFormat, RGB.parse("rgb:not/hex/zz"));
try testing.expectError(error.InvalidFormat, RGB.parse("#"));
try testing.expectError(error.InvalidFormat, RGB.parse("#ff"));
try testing.expectError(error.InvalidFormat, RGB.parse("#ffff"));
try testing.expectError(error.InvalidFormat, RGB.parse("#fffff"));
try testing.expectError(error.InvalidFormat, RGB.parse("#gggggg"));
}