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/*
* File: fix/fix.hpp
* Purpose: Financial Information Exchange parser in C++
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
*/
#ifndef _OCL_FIX_PARSER_HPP
#define _OCL_FIX_PARSER_HPP
#include <cstddef>
#include <cassert>
#include <utility>
#include <string>
#include <vector>
#include <cstdint>
#include <sys/types.h>
#include <unistd.h>
namespace ocl::fix
{
template <typename char_type>
class basic_visitor;
template <typename char_type>
struct basic_range;
template <typename char_type>
class basic_range_data;
/// @brief Buffer+Length structure
template <typename char_type = char>
using range_ptr_t = basic_range<char_type>;
namespace detail
{
template <typename char_type = char>
const char_type* begin_fix();
template <>
inline const char* begin_fix<char>()
{
return "FIX.4.2";
}
template <>
inline const char16_t* begin_fix<char16_t>()
{
return u"FIX.4.2";
}
template <>
inline const char8_t* begin_fix<char8_t>()
{
return u8"FIX.4.2";
}
} // namespace detail
template <typename char_type = char>
struct basic_range final
{
char_type* bytes_{nullptr};
size_t length_{};
bool is_valid() noexcept
{
return this->bytes_ && this->length_ > 0;
}
explicit operator bool()
{
return this->is_valid();
}
};
/// @brief Convert basic_range to usable string.
/// @note This function assumes that the basic_range is valid and contains ASCII bytes.
template <typename char_type = char>
inline std::basic_string<char_type> to_string(basic_range<char_type>& basic_range) noexcept
{
if (basic_range.length_ < 0)
return std::basic_string<char_type>{};
return std::basic_string<char_type>(basic_range.ascii_bytes_, basic_range.length_);
}
/// @brief a basic_range object containing the FIX packet values.
template <typename char_type = char>
class basic_range_data final
{
public:
std::size_t magic_len_{};
std::basic_string<char_type> magic_{};
std::size_t body_len_{};
std::vector<std::pair<std::basic_string<char_type>, std::basic_string<char_type>>> body_{};
static inline const char_type* begin = detail::begin_fix<char_type>();
explicit basic_range_data() = default;
~basic_range_data() = default;
basic_range_data& operator=(const basic_range_data&) = default;
basic_range_data(const basic_range_data&) = default;
std::basic_string<char_type> operator[](const std::basic_string<char_type>& key)
{
if (key.empty())
{
return std::basic_string<char_type>{};
}
for (const auto& pair : this->body_)
{
if (pair.first == key)
{
return pair.second;
}
}
return std::basic_string<char_type>{};
}
bool is_valid()
{
return magic_.starts_with(basic_range_data<char_type>::begin);
}
explicit operator bool()
{
return this->is_valid();
}
};
/// @brief basic_visitor object which returns a fix::basic_range_data instance.
template <typename char_type = char>
class basic_visitor final
{
public:
static constexpr const char_type soh = '|';
static constexpr const char_type eq = '=';
static constexpr uint32_t base = 10U;
explicit basic_visitor() = default;
~basic_visitor() = default;
basic_visitor& operator=(const basic_visitor&) = default;
basic_visitor(const basic_visitor&) = default;
basic_range<char_type> operator()(const std::basic_string<char_type>& in)
{
return this->visit(in);
}
basic_range_data<char_type> visit(const std::basic_string<char_type>& in)
{
thread_local basic_range_data<char_type> ret{};
if (in.empty())
return ret;
static thread_local std::basic_string<char_type> in_tmp{};
in_tmp.reserve(in.size());
try
{
for (auto& ch : in)
{
if (ch != basic_visitor::soh)
{
in_tmp += ch;
continue;
}
std::basic_string<char_type> key = in_tmp.substr(0, in_tmp.find(basic_visitor::eq));
std::basic_string<char_type> val = in_tmp.substr(in_tmp.find(basic_visitor::eq) + 1);
if (ret.magic_.empty())
{
ret.magic_ = val;
ret.magic_len_ = ret.magic_.size();
}
else
{
ret.body_.emplace_back(std::make_pair(key, val));
ret.body_len_ += in_tmp.size();
}
in_tmp.clear();
}
}
catch (...)
{
in_tmp.clear();
return ret;
}
in_tmp.clear();
return ret;
}
};
template <typename char_type = char, typename error_handler>
inline void must_pass(basic_range_data<char_type>& basic_range, error_handler& handler)
{
if (!basic_range.is_valid())
{
handler.template error<true>("Invalid FIX packet.");
}
}
using fix_tag_type = std::uint32_t;
using range_data = basic_range_data<char>;
using visitor = basic_visitor<char>;
} // namespace ocl::fix
#endif // ifndef _OCL_FIX_PARSER_HPP
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