ladybird/AK/DeprecatedFlyString.cpp

109 lines
2.7 KiB
C++

/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteString.h>
#include <AK/DeprecatedFlyString.h>
#include <AK/HashTable.h>
#include <AK/Optional.h>
#include <AK/Singleton.h>
#include <AK/StringUtils.h>
#include <AK/StringView.h>
namespace AK {
struct DeprecatedFlyStringImplTraits : public Traits<StringImpl const*> {
static unsigned hash(StringImpl const* s) { return s->hash(); }
static bool equals(StringImpl const* a, StringImpl const* b)
{
return *a == *b;
}
};
static Singleton<HashTable<StringImpl const*, DeprecatedFlyStringImplTraits>> s_table;
static HashTable<StringImpl const*, DeprecatedFlyStringImplTraits>& fly_impls()
{
return *s_table;
}
void DeprecatedFlyString::did_destroy_impl(Badge<StringImpl>, StringImpl& impl)
{
fly_impls().remove(&impl);
}
DeprecatedFlyString::DeprecatedFlyString(ByteString const& string)
: m_impl(string.impl())
{
if (string.impl()->is_fly())
return;
auto it = fly_impls().find(string.impl());
if (it == fly_impls().end()) {
fly_impls().set(string.impl());
string.impl()->set_fly({}, true);
m_impl = string.impl();
} else {
VERIFY((*it)->is_fly());
m_impl = **it;
}
}
DeprecatedFlyString::DeprecatedFlyString(StringView string)
: m_impl(StringImpl::the_empty_stringimpl())
{
if (string.is_null())
return;
auto it = fly_impls().find(string.hash(), [&](auto& candidate) {
return string == *candidate;
});
if (it == fly_impls().end()) {
auto new_string = string.to_byte_string();
fly_impls().set(new_string.impl());
new_string.impl()->set_fly({}, true);
m_impl = new_string.impl();
} else {
VERIFY((*it)->is_fly());
m_impl = **it;
}
}
bool DeprecatedFlyString::equals_ignoring_ascii_case(StringView other) const
{
return StringUtils::equals_ignoring_ascii_case(view(), other);
}
bool DeprecatedFlyString::starts_with(StringView str, CaseSensitivity case_sensitivity) const
{
return StringUtils::starts_with(view(), str, case_sensitivity);
}
bool DeprecatedFlyString::ends_with(StringView str, CaseSensitivity case_sensitivity) const
{
return StringUtils::ends_with(view(), str, case_sensitivity);
}
DeprecatedFlyString DeprecatedFlyString::to_lowercase() const
{
return ByteString(*m_impl).to_lowercase();
}
bool DeprecatedFlyString::operator==(ByteString const& other) const
{
return m_impl == other.impl() || view() == other.view();
}
bool DeprecatedFlyString::operator==(StringView string) const
{
return view() == string;
}
bool DeprecatedFlyString::operator==(char const* string) const
{
return view() == string;
}
}