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/*
* File: core/chunk_string.hpp
* Purpose: String implementation for the OCL C++ library.
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss
*/
#ifndef OCL_UTILITY_CHUNK_STRING_HPP
#define OCL_UTILITY_CHUNK_STRING_HPP
#include <lib/core/includes.hpp>
#include <lib/io/print.hpp>
#include <cstring>
namespace ocl
{
template <typename char_type, std::size_t max_chunk_size = 8196>
class basic_chunk_string;
template <typename char_type, std::size_t max_chunk_size>
class basic_chunk_string final
{
private:
char_type packed_chunks_[max_chunk_size] = {0};
std::size_t chunk_total_{};
bool bad_{false};
public:
const bool& bad{bad_};
basic_chunk_string() = default;
basic_chunk_string(const char_type* in)
{
this->operator+=(in);
}
basic_chunk_string(const std::basic_string<char_type>& in)
{
this->operator+=(in);
}
~basic_chunk_string() = default;
basic_chunk_string& operator=(const basic_chunk_string&) = delete;
basic_chunk_string(const basic_chunk_string&) = delete;
public:
/// @brief Append a std::basic_string to the chunk string.
basic_chunk_string& operator+=(const char_type* in)
{
if (in == nullptr || bad_)
return *this;
const auto& sz = std::strlen(in);
this->operator+=(std::basic_string<char_type>(in, sz));
return *this;
}
basic_chunk_string& operator+=(const std::basic_string<char_type>& in)
{
if (in.empty() || bad_)
return *this;
if (in.size() > max_chunk_size)
{
bad_ = true;
return *this;
}
if (chunk_total_ > max_chunk_size)
{
bad_ = true;
return *this;
}
const auto& sz = in.size();
const static auto size_max_chunk = max_chunk_size;
const auto& ptr = in.data();
if (chunk_total_ < size_max_chunk)
{
std::memcpy(packed_chunks_ + chunk_total_, ptr, sz);
chunk_total_ += sz;
}
return *this;
}
/// @brief Convert to basic_string or return from cache.
std::basic_string<char_type> str() const noexcept
{
static std::basic_string<char_type> ret;
const auto& sz = ret.size();
if (chunk_total_ > sz)
ret.clear();
else
return ret;
ret = packed_chunks_;
return ret;
}
void print() noexcept
{
ocl::io::print(packed_chunks_);
}
};
template <typename char_type>
inline void print(basic_chunk_string<char_type>& fmt) noexcept
{
fmt.print();
}
} // namespace ocl
#endif // ifndef OCL_UTILITY_CHUNK_STRING_HPP
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