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//! Property set per codepoint that Ghostty cares about.
//!
//! Adding to this lets you find new properties but also potentially makes
//! our lookup tables less efficient. Any changes to this should run the
//! benchmarks in src/bench to verify that we haven't regressed.
const Properties = @This();
const std = @import("std");
/// Codepoint width. We clamp to [0, 2] since Ghostty handles control
/// characters and we max out at 2 for wide characters (i.e. 3-em dash
/// becomes a 2-em dash).
width: u2 = 0,
/// Grapheme boundary class.
grapheme_boundary_class: GraphemeBoundaryClass = .invalid,
// Needed for lut.Generator
pub fn eql(a: Properties, b: Properties) bool {
return a.width == b.width and
a.grapheme_boundary_class == b.grapheme_boundary_class;
}
// Needed for lut.Generator
pub fn format(
self: Properties,
writer: *std.Io.Writer,
) !void {
try writer.print(
\\.{{
\\ .width= {},
\\ .grapheme_boundary_class= .{s},
\\}}
, .{
self.width,
@tagName(self.grapheme_boundary_class),
});
}
/// Possible grapheme boundary classes. This isn't an exhaustive list:
/// we omit control, CR, LF, etc. because in Ghostty's usage that are
/// impossible because they're handled by the terminal.
pub const GraphemeBoundaryClass = enum(u4) {
invalid,
L,
V,
T,
LV,
LVT,
prepend,
extend,
zwj,
spacing_mark,
regional_indicator,
extended_pictographic,
extended_pictographic_base, // \p{Extended_Pictographic} & \p{Emoji_Modifier_Base}
emoji_modifier, // \p{Emoji_Modifier}
/// Returns true if this is an extended pictographic type. This
/// should be used instead of comparing the enum value directly
/// because we classify multiple.
pub fn isExtendedPictographic(self: GraphemeBoundaryClass) bool {
return switch (self) {
.extended_pictographic,
.extended_pictographic_base,
=> true,
else => false,
};
}
};
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