mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-07-25 10:22:14 +00:00
7f069efbc4
Utf16FlyString more or less works exactly the same as FlyString. It will store the raw encoded data of the string instance. If the string is a short ASCII string, Utf16FlyString holds the ShortString bytes; else, Utf16FlyString holds a pointer to the Utf16StringData.
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/HashTable.h>
|
|
#include <AK/Singleton.h>
|
|
#include <AK/Utf16FlyString.h>
|
|
|
|
namespace AK {
|
|
|
|
struct Utf16FlyStringTableHashTraits : public Traits<Detail::Utf16StringData const*> {
|
|
static u32 hash(Detail::Utf16StringData const* string) { return string->hash(); }
|
|
static bool equals(Detail::Utf16StringData const* a, Detail::Utf16StringData const* b) { return *a == *b; }
|
|
};
|
|
|
|
static auto& all_utf16_fly_strings()
|
|
{
|
|
static Singleton<HashTable<Detail::Utf16StringData const*, Utf16FlyStringTableHashTraits>> table;
|
|
return *table;
|
|
}
|
|
|
|
namespace Detail {
|
|
|
|
void did_destroy_utf16_fly_string_data(Badge<Detail::Utf16StringData>, Detail::Utf16StringData const& data)
|
|
{
|
|
all_utf16_fly_strings().remove(&data);
|
|
}
|
|
|
|
}
|
|
|
|
template<typename ViewType>
|
|
Optional<Utf16FlyString> Utf16FlyString::create_fly_string_from_cache(ViewType const& string)
|
|
{
|
|
if (string.is_empty())
|
|
return {};
|
|
|
|
if constexpr (IsSame<ViewType, StringView>) {
|
|
if (string.length() <= Detail::MAX_SHORT_STRING_BYTE_COUNT && string.is_ascii())
|
|
return Utf16String::from_utf8_without_validation(string);
|
|
} else {
|
|
if (string.length_in_code_units() <= Detail::MAX_SHORT_STRING_BYTE_COUNT && string.is_ascii())
|
|
return Utf16String::from_utf16_without_validation(string);
|
|
}
|
|
|
|
if (auto it = all_utf16_fly_strings().find(string.hash(), [&](auto const& entry) { return *entry == string; }); it != all_utf16_fly_strings().end())
|
|
return Utf16FlyString { Detail::Utf16StringBase(**it) };
|
|
|
|
return {};
|
|
}
|
|
|
|
Utf16FlyString Utf16FlyString::from_utf8(StringView string)
|
|
{
|
|
if (auto result = create_fly_string_from_cache(string); result.has_value())
|
|
return result.release_value();
|
|
return Utf16String::from_utf8(string);
|
|
}
|
|
|
|
Utf16FlyString Utf16FlyString::from_utf8_without_validation(StringView string)
|
|
{
|
|
if (auto result = create_fly_string_from_cache(string); result.has_value())
|
|
return result.release_value();
|
|
return Utf16String::from_utf8_without_validation(string);
|
|
}
|
|
|
|
Utf16FlyString Utf16FlyString::from_utf16(Utf16View const& string)
|
|
{
|
|
if (auto result = create_fly_string_from_cache(string); result.has_value())
|
|
return result.release_value();
|
|
return Utf16String::from_utf16(string);
|
|
}
|
|
|
|
Utf16FlyString Utf16FlyString::from_utf16_without_validation(Utf16View const& string)
|
|
{
|
|
if (auto result = create_fly_string_from_cache(string); result.has_value())
|
|
return result.release_value();
|
|
return Utf16String::from_utf16_without_validation(string);
|
|
}
|
|
|
|
Utf16FlyString::Utf16FlyString(Utf16String const& string)
|
|
{
|
|
if (string.has_short_ascii_storage()) {
|
|
m_data = string;
|
|
return;
|
|
}
|
|
|
|
auto const* data = string.data({});
|
|
|
|
if (data->is_fly_string()) {
|
|
m_data = string;
|
|
return;
|
|
}
|
|
|
|
if (auto it = all_utf16_fly_strings().find(data); it == all_utf16_fly_strings().end()) {
|
|
m_data = string;
|
|
|
|
all_utf16_fly_strings().set(data);
|
|
data->mark_as_fly_string({});
|
|
} else {
|
|
m_data.set_data({}, *it);
|
|
}
|
|
}
|
|
|
|
size_t Utf16FlyString::number_of_utf16_fly_strings()
|
|
{
|
|
return all_utf16_fly_strings().size();
|
|
}
|
|
|
|
}
|