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/*
* File: fix/parser.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 <core/config.hpp>
#include <hashing/crc_hash.hpp>
#include <io/print.hpp>
#include <string>
namespace ocl::fix
{
class basic_visitor;
struct basic_range;
class basic_range_data;
/// @brief Buffer+Length structure
using range_ptr_t = basic_range*;
namespace detail
{
inline const char* begin_fix() noexcept
{
return "FIX.4.2";
}
} // namespace detail
struct basic_range final
{
char* 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.
inline std::string to_string(basic_range& basic_range) noexcept
{
if (basic_range.length_ < 1)
return std::string{};
return std::string(basic_range.bytes_, basic_range.length_);
}
/// @brief a basic_range object containing the FIX packet values.
class basic_range_data final
{
public:
std::size_t magic_len_{};
std::string magic_{};
string_hash_map<std::string> message_{};
static inline const char* begin = detail::begin_fix();
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::string operator[](const std::string& key)
{
if (key.empty())
return std::string{};
auto it = message_.find(key);
if (it != message_.end())
return it->second;
return std::string{};
}
bool is_valid()
{
return this->operator[]("8").empty() == false;
}
explicit operator bool()
{
return this->is_valid();
}
};
/// @brief basic_visitor object which returns a fix::basic_range_data instance.
class basic_visitor final
{
public:
/// AMLALE: Yeah...
static constexpr const int soh = '\x01';
static constexpr const char 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_data operator()(const std::string& in)
{
return this->visit(in);
}
/// @brief Visit a FIX message and parse it into a basic_range_data object.
/// @param in The input FIX message as a string.
/// @warning This function may throw exceptions.
basic_range_data visit(const std::string& in)
{
basic_range_data ret{};
if (in.empty())
return ret;
std::string key;
std::size_t off = 0UL;
while (off < in.size())
{
// Find the '=' separator
std::size_t eq_pos = in.find(eq, off);
if (eq_pos == std::string::npos)
break;
// Extract tag (everything from current position to '=')
std::string tag = in.substr(off, eq_pos - off);
// Find the SOH delimiter after the value (or end of string)
std::size_t soh_pos = in.find(soh, eq_pos + 1);
if (soh_pos == std::string::npos)
soh_pos = in.size();
// Extract value (everything from after '=' to SOH)
std::string value = in.substr(eq_pos + 1, soh_pos - eq_pos - 1);
// Store first value as magic (should be BeginString)
if (ret.magic_.empty())
{
ret.magic_ = value;
ret.magic_len_ = value.size();
}
// Store tag-value pair
ret.message_[tag] = value;
// Move to position after the SOH
off = soh_pos + 1;
}
return ret;
}
};
using fix_tag_type = std::string;
using range_data = basic_range_data;
using visitor = basic_visitor;
} // namespace ocl::fix
#endif // ifndef _OCL_FIX_PARSER_HPP
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