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AK: Simplify String::repeated by leveraging StringBase helpers

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Dan Klishch 2023-10-28 17:15:40 -04:00 committed by Andrew Kaster
parent 7dbe357e9f
commit 5d6cd65e29
Notes: sideshowbarker 2024-07-16 19:42:24 +09:00 
Author: https://github.com/DanShaders
Commit: https://github.com/SerenityOS/serenity/commit/5d6cd65e29
Pull-request: https://github.com/SerenityOS/serenity/pull/21661
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/kleinesfilmroellchen
Reviewed-by: https://github.com/trflynn89
1 changed files with 23 additions and 34 deletions
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57
AK/String.cpp
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@ -134,31 +134,19 @@ ErrorOr<String> String::repeated(u32 code_point, size_t count)
code_point_as_utf8[i++] = static_cast<u8>(byte);
});
auto copy_to_buffer = [&](u8* buffer) {
if (code_point_byte_length == 1) {
memset(buffer, code_point_as_utf8[0], count);
return;
}
for (i = 0; i < count; ++i)
memcpy(buffer + (i * code_point_byte_length), code_point_as_utf8.data(), code_point_byte_length);
};
auto total_byte_count = code_point_byte_length * count;
if (total_byte_count <= MAX_SHORT_STRING_BYTE_COUNT) {
ShortString short_string;
copy_to_buffer(short_string.storage);
short_string.byte_count_and_short_string_flag = (total_byte_count << 1) | SHORT_STRING_FLAG;
return String { short_string };
}
u8* buffer = nullptr;
auto new_string_data = TRY(Detail::StringData::create_uninitialized(total_byte_count, buffer));
copy_to_buffer(buffer);
return String { move(new_string_data) };
String result;
TRY(result.replace_with_new_string(total_byte_count, [&](Bytes buffer) {
if (code_point_byte_length == 1) {
buffer.fill(code_point_as_utf8[0]);
} else {
for (i = 0; i < count; ++i)
memcpy(buffer.data() + (i * code_point_byte_length), code_point_as_utf8.data(), code_point_byte_length);
}
return ErrorOr<void> {};
}));
return result;
}
StringView String::bytes_as_string_view() const
@ -462,18 +450,19 @@ bool String::equals_ignoring_ascii_case(StringView other) const
String String::repeated(String const& input, size_t count)
{
VERIFY(!Checked<size_t>::multiplication_would_overflow(count, input.bytes().size()));
u8* buffer = nullptr;
auto data = MUST(Detail::StringData::create_uninitialized(count * input.bytes().size(), buffer));
if (input.bytes().size() == 1) {
memset(buffer, input.bytes().first(), count);
return String { move(data) };
}
for (size_t i = 0; i < count; ++i) {
memcpy(buffer + (i * input.bytes().size()), input.bytes().data(), input.bytes().size());
}
return String { data };
String result;
size_t input_size = input.bytes().size();
MUST(result.replace_with_new_string(count * input_size, [&](Bytes buffer) {
if (input_size == 1) {
buffer.fill(input.bytes().first());
} else {
for (size_t i = 0; i < count; ++i)
input.bytes().copy_to(buffer.slice(i * input_size, input_size));
}
return ErrorOr<void> {};
}));
return result;
}
}