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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/FlyString.h>
#include <AK/HashTable.h>
#include <AK/Optional.h>
#include <AK/Singleton.h>
#include <AK/String.h>
#include <AK/StringUtils.h>
#include <AK/StringView.h>
namespace AK {
struct FlyStringImplTraits : public Traits<StringImpl*> {
static unsigned hash(const StringImpl* s) { return s ? s->hash() : 0; }
static bool equals(const StringImpl* a, const StringImpl* b)
{
VERIFY(a);
VERIFY(b);
return *a == *b;
}
};
static AK::Singleton<HashTable<StringImpl*, FlyStringImplTraits>> s_table;
static HashTable<StringImpl*, FlyStringImplTraits>& fly_impls()
{
return *s_table;
}
void FlyString::did_destroy_impl(Badge<StringImpl>, StringImpl& impl)
{
fly_impls().remove(&impl);
}
FlyString::FlyString(const String& string)
{
if (string.is_null())
return;
if (string.impl()->is_fly()) {
m_impl = string.impl();
return;
}
auto it = fly_impls().find(const_cast<StringImpl*>(string.impl()));
if (it == fly_impls().end()) {
fly_impls().set(const_cast<StringImpl*>(string.impl()));
string.impl()->set_fly({}, true);
m_impl = string.impl();
} else {
VERIFY((*it)->is_fly());
m_impl = *it;
}
}
FlyString::FlyString(StringView const& string)
{
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_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;
}
}
template<typename T>
Optional<T> FlyString::to_int() const
{
return StringUtils::convert_to_int<T>(view());
}
template Optional<i8> FlyString::to_int() const;
template Optional<i16> FlyString::to_int() const;
template Optional<i32> FlyString::to_int() const;
template Optional<i64> FlyString::to_int() const;
template<typename T>
Optional<T> FlyString::to_uint() const
{
return StringUtils::convert_to_uint<T>(view());
}
template Optional<u8> FlyString::to_uint() const;
template Optional<u16> FlyString::to_uint() const;
template Optional<u32> FlyString::to_uint() const;
template Optional<u64> FlyString::to_uint() const;
bool FlyString::equals_ignoring_case(const StringView& other) const
{
return StringUtils::equals_ignoring_case(view(), other);
}
bool FlyString::starts_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::starts_with(view(), str, case_sensitivity);
}
bool FlyString::ends_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::ends_with(view(), str, case_sensitivity);
}
FlyString FlyString::to_lowercase() const
{
return String(*m_impl).to_lowercase();
}
bool FlyString::operator==(const String& other) const
{
if (m_impl == other.impl())
return true;
if (!m_impl)
return !other.impl();
if (!other.impl())
return false;
if (length() != other.length())
return false;
return !__builtin_memcmp(characters(), other.characters(), length());
}
bool FlyString::operator==(const StringView& string) const
{
return *this == String(string);
}
bool FlyString::operator==(const char* string) const
{
if (is_null())
return !string;
if (!string)
return false;
return !__builtin_strcmp(m_impl->characters(), string);
}
}
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