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feat: add toggle_case

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Danylo Kondratiev 2026-01-22 23:33:09 +02:00 • committed by CJ van den Berg
parent d7c02f0700
commit b2cb003d82
Signed by: neurocyte
GPG key ID: 8EB1E1BB660E3FB9
2 changed files with 42 additions and 0 deletions
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18
src/buffer/unicode.zig
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@ -201,6 +201,24 @@ pub fn switch_case(allocator: std.mem.Allocator, text: []const u8) TransformErro
to_upper(allocator, text);
}
pub fn toggle_case(allocator: std.mem.Allocator, text: []const u8) TransformError![]u8 {
var result: std.Io.Writer.Allocating = .init(allocator);
defer result.deinit();
const writer = &result.writer;
const view: Utf8View = .initUnchecked(text);
var it = view.iterator();
while (it.nextCodepoint()) |cp| {
const cp_ = if (uucode.get(.is_lowercase, cp))
uucode.get(.simple_uppercase_mapping, cp) orelse cp
else
uucode.get(.simple_lowercase_mapping, cp) orelse cp;
var utf8_buf: [6]u8 = undefined;
const size = try utf8Encode(cp_, &utf8_buf);
try writer.writeAll(utf8_buf[0..size]);
}
return result.toOwnedSlice();
}
pub fn is_lowercase(text: []const u8) bool {
return utf8_predicate_all(.is_lowercase, text);
}