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Str.walkScalars

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Folkert 2022-07-04 18:01:19 +02:00
parent 1de9270ecf
commit 6d7c329698
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15 changed files with 109 additions and 2 deletions
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1
crates/compiler/builtins/bitcode/src/main.zig
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@ -159,6 +159,7 @@ comptime {
exportStrFn(str.substringUnsafe, "substring_unsafe");
exportStrFn(str.getUnsafe, "get_unsafe");
exportStrFn(str.reserve, "reserve");
exportStrFn(str.getScalarUnsafe, "get_scalar_unsafe");
exportStrFn(str.appendScalar, "append_scalar");
exportStrFn(str.strToUtf8C, "to_utf8");
exportStrFn(str.fromUtf8C, "from_utf8");

20
crates/compiler/builtins/bitcode/src/str.zig
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@ -2469,3 +2469,23 @@ pub fn reserve(string: RocStr, capacity: usize) callconv(.C) RocStr {
return string;
}
}
pub fn getScalarUnsafe(string: RocStr, index: usize) callconv(.C) extern struct { bytesParsed: usize, scalar: u32 } {
const slice = string.asSlice();
const bytesParsed = @intCast(usize, std.unicode.utf8ByteSequenceLength(slice[index]) catch unreachable);
const scalar = std.unicode.utf8Decode(slice[index .. index + bytesParsed]) catch unreachable;
return .{ .bytesParsed = bytesParsed, .scalar = @intCast(u32, scalar) };
}
test "getScalarUnsafe" {
const data_bytes = "A";
var data = RocStr.init(data_bytes, data_bytes.len);
const result = getScalarUnsafe(data, 0);
const expected = try std.unicode.utf8Decode("A");
try expectEqual(result.scalar, @intCast(u32, expected));
try expectEqual(result.bytesParsed, 1);
}