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/*
* File: fix/parser.hpp
* Purpose: Financial Information Exchange parser in C++
* Author: Amlal El Mahrouss (founder@snu.systems)
* Copyright 2025, Amlal El Mahrouss and SNU Systems Corp all rights reserved.
*/
#ifndef _SNU_FIX_PARSER_HPP
#define _SNU_FIX_PARSER_HPP
#include <cstddef>
#include <cassert>
#include <utility>
#include <string>
#include <vector>
namespace snu::fix
{
template <typename char_type>
struct visitor;
template <typename char_type>
struct range;
template <typename char_type>
struct range_data;
/// @brief Buffer+Length structure
template <typename char_type>
using range_ptr_t = range<char_type>;
namespace detail
{
template <typename char_type>
const char_type* begin_fix();
template <>
inline const char* begin_fix<char>()
{
return "FIX.";
}
template <>
inline const char16_t* begin_fix<char16_t>()
{
return u"FIX.";
}
template <>
inline const char8_t* begin_fix<char8_t>()
{
return u8"FIX.";
}
} // namespace detail
template <typename char_type>
struct range final
{
char_type* bytes_;
size_t length_;
bool is_valid()
{
return bytes_ && length_ > 0;
}
operator bool()
{
return this->is_valid();
}
};
/// @brief Convert range to usable string.
/// @note This function assumes that the range is valid and contains ASCII bytes.
template <typename char_type>
inline std::basic_string<char_type> to_string(range<char_type>& range) noexcept
{
if (range.length_ < 0)
return std::basic_string<char_type>{};
return std::basic_string<char_type>(range.ascii_bytes_, range.length_);
}
/// @brief a range object containing the FIX packet values.
template <typename char_type>
class range_data final
{
public:
std::basic_string<char_type> msg_magic_;
std::size_t msg_body_len_;
std::vector<std::pair<std::basic_string<char_type>, std::basic_string<char_type>>> msg_body_;
static inline const char_type* begin = detail::begin_fix<char_type>();
explicit range_data() = default;
~range_data() = default;
range_data& operator=(const range_data&) = default;
range_data(const 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 : msg_body_)
{
if (pair.first == key)
{
return pair.second;
}
}
return std::basic_string<char_type>{};
}
bool is_valid()
{
return msg_magic_.starts_with(range_data<char_type>::begin);
}
operator bool()
{
return this->is_valid();
}
};
/// @brief visitor object which returns a fix::range_data instance.
template <typename char_type>
class visitor final
{
public:
static constexpr const char_type soh = '|';
static constexpr const char_type eq = '=';
static constexpr uint32_t base = 10U;
explicit visitor() = default;
~visitor() = default;
visitor& operator=(const visitor&) = default;
visitor(const visitor&) = default;
range<char_type> operator()(const std::basic_string<char_type>& in)
{
return this->visit(in);
}
range_data<char_type> visit(const std::basic_string<char_type>& in)
{
thread_local range_data<char_type> ret{};
if (in.empty())
return ret;
thread_local std::basic_string<char_type> in_tmp{};
in_tmp.reserve(in.size());
try
{
for (auto& ch : in)
{
if (ch != visitor::soh)
{
in_tmp += ch;
continue;
}
std::basic_string<char_type> key = in_tmp.substr(0, in_tmp.find(visitor::eq));
std::basic_string<char_type> val = in_tmp.substr(in_tmp.find(visitor::eq) + 1);
if (ret.msg_magic_.empty())
{
ret.msg_magic_ = val;
}
else
{
ret.msg_body_.emplace_back(std::make_pair(key, val));
ret.msg_body_len_ += in_tmp.size();
}
in_tmp.clear();
}
}
catch (...)
{
in_tmp.clear();
return ret;
}
in_tmp.clear();
return ret;
}
};
} // namespace snu::fix
#endif // ifndef _SNU_FIX_PARSER_HPP
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