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#include "string.hh"
#include <cstring>
#include "assert.hh"
#include "unit_tests.hh"
namespace Kakoune
{
namespace
{
// Avoid including all of <algorithm> just for this.
constexpr auto max(auto lhs, auto rhs) { return lhs > rhs ? lhs : rhs;}
constexpr auto min(auto lhs, auto rhs) { return lhs < rhs ? lhs : rhs;}
}
String::Data::Data(const char* data, size_t size, size_t capacity)
{
if (capacity > Short::capacity)
{
kak_assert(capacity <= Long::max_capacity);
u.l.ptr = Alloc{}.allocate(capacity+1);
u.l.size = size;
u.l.capacity = (capacity & Long::max_capacity);
u.l.mode = Long::active_mask;
if (data != nullptr)
memcpy(u.l.ptr, data, size);
u.l.ptr[size] = 0;
}
else
set_short(data, size);
}
String::Data& String::Data::operator=(const Data& other)
{
if (&other == this)
return *this;
const size_t new_size = other.size();
reserve<false>(new_size);
memcpy(data(), other.data(), new_size+1);
set_size(new_size);
return *this;
}
String::Data& String::Data::operator=(Data&& other) noexcept
{
if (&other == this)
return *this;
release();
if (other.is_long())
{
u.l = other.u.l;
other.set_empty();
}
else
u.s = other.u.s;
return *this;
}
template<bool copy>
void String::Data::reserve(size_t new_capacity)
{
auto const current_capacity = capacity();
if (current_capacity != 0 and new_capacity <= current_capacity)
return;
if (!is_long() and new_capacity <= Short::capacity)
return;
kak_assert(new_capacity <= Long::max_capacity);
new_capacity = max(new_capacity, // Do not upgrade new_capacity to be over limit.
min(current_capacity * 2, Long::max_capacity));
char* new_ptr = Alloc{}.allocate(new_capacity+1);
if (copy)
{
memcpy(new_ptr, data(), size()+1);
}
release();
u.l.size = size();
u.l.ptr = new_ptr;
u.l.capacity = (new_capacity & Long::max_capacity);
u.l.mode = Long::active_mask;
}
template void String::Data::reserve<true>(size_t);
template void String::Data::reserve<false>(size_t);
void String::Data::force_size(size_t new_size)
{
reserve<false>(new_size);
set_size(new_size);
data()[new_size] = 0;
}
void String::Data::append(const char* str, size_t len)
{
if (len == 0)
return;
const size_t new_size = size() + len;
reserve(new_size);
memcpy(data() + size(), str, len);
set_size(new_size);
data()[new_size] = 0;
}
void String::Data::clear()
{
release();
set_empty();
}
void String::resize(ByteCount size, char c)
{
const size_t target_size = (size_t)size;
const size_t current_size = m_data.size();
if (target_size < current_size)
m_data.set_size(target_size);
else if (target_size > current_size)
{
m_data.reserve(target_size);
m_data.set_size(target_size);
for (auto i = current_size; i < target_size; ++i)
m_data.data()[i] = c;
}
data()[target_size] = 0;
}
void String::Data::set_size(size_t size)
{
if (is_long())
u.l.size = size;
else
u.s.remaining_size = Short::capacity - size;
}
void String::Data::set_short(const char* data, size_t size)
{
kak_assert(size <= Short::capacity);
u.s.remaining_size = Short::capacity - size;
if (data != nullptr)
memcpy(u.s.string, data, size);
if (size != Short::capacity) // in this case, remaining_size is the null terminator
u.s.string[size] = 0;
}
UnitTest test_data{[]{
using Data = String::Data;
{ // Basic data usage.
Data data;
kak_assert(data.size() == 0);
kak_assert(not data.is_long());
kak_assert(data.capacity() == 23);
// Should be SSO-ed.
data.append("test", 4);
kak_assert(data.size() == 4);
kak_assert(data.capacity() == 23);
kak_assert(not data.is_long());
kak_assert(data.data() == StringView("test"));
}
{
char large_buf[2048];
memset(large_buf, 'x', 2048);
Data data(large_buf, 2048);
kak_assert(data.size() == 2048);
kak_assert(data.capacity() >= 2048);
data.clear();
kak_assert(data.size() == 0);
kak_assert(not data.is_long());
kak_assert(data.capacity() == 23);
}
}};
const String String::ms_empty;
}
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