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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 <ocl/fix/detail/config.hpp>
#include <string>
namespace ocl::fix
{
class visitor;
struct range;
class range_buffer;
/// @brief Buffer+Length structure
using range_ptr_type = range*;
using tag_type = std::string;
using value_type = std::string;
namespace detail
{
inline const char* begin_fix() noexcept
{
return "FIX.4.2";
}
} // namespace detail
struct 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 range to usable string.
/// @note This function assumes that the range is valid and contains ASCII bytes.
inline std::string to_string(range& range) noexcept
{
if (range.length_ < 1)
return std::string{};
return std::string(range.bytes_, range.length_);
}
/// @brief a range object containing the FIX packet values.
class range_buffer final
{
public:
std::size_t magic_len_{};
std::string magic_{};
string_hash_map<value_type> message_{};
static inline const char* begin = detail::begin_fix();
explicit range_buffer() = default;
~range_buffer() = default;
range_buffer& operator=(const range_buffer&) = default;
range_buffer(const range_buffer&) = default;
value_type operator[](const tag_type& key)
{
if (key.empty())
return value_type{};
auto it = message_.find(key);
if (it != message_.end())
return it->second;
return value_type{};
}
bool is_valid()
{
return this->operator[]("8").empty() == false;
}
explicit operator bool()
{
return this->is_valid();
}
};
/// @brief visitor object which returns a fix::range_buffer instance.
class visitor final
{
public:
/// AMLALE: Yeah...
static constexpr const int soh = '\x01';
static constexpr const char eq = '=';
static constexpr uint32_t base = 10U;
explicit visitor() = default;
~visitor() = default;
visitor& operator=(const visitor&) = default;
visitor(const visitor&) = default;
range_buffer operator()(const std::string& in)
{
return this->visit(in);
}
/// @brief Visit a FIX message and parse it into a range_buffer object.
/// @param in The input FIX message as a string.
/// @warning This function may throw exceptions.
range_buffer visit(const std::string& in)
{
range_buffer ret{};
if (in.empty())
return ret;
std::string key;
std::size_t off = 0UL;
while (off < in.size())
{
std::size_t eq_pos = in.find(eq, off);
if (eq_pos == std::string::npos)
break;
std::string tag = in.substr(off, eq_pos - off);
std::size_t soh_pos = in.find(soh, eq_pos + 1);
if (soh_pos == std::string::npos)
soh_pos = in.size();
std::string value = in.substr(eq_pos + 1, soh_pos - eq_pos - 1);
if (ret.magic_.empty())
{
ret.magic_ = value;
ret.magic_len_ = value.size();
}
ret.message_[tag] = value;
off = soh_pos + 1;
}
return ret;
}
};
} // namespace ocl::fix
#endif // ifndef _OCL_FIX_PARSER_HPP
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