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// SPDX-License-Identifier: BSL-1.0
// Copyright 2025-2026, Amlal El Mahrouss (amlal@nekernel.org)
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// Official repository: https://github.com/ocl-foss-org/fix
#ifndef OCL_FIX_PARSER
#define OCL_FIX_PARSER
#include <ocl/fix/detail/config.hpp>
#include <fstream>
#include <string>
#include <memory>
namespace ocl::fix
{
class visitor;
struct range;
class range_buffer;
/// @brief Buffer+Length structure
using range_ptr_type = range*;
using range_type = range;
using tag_type = std::string;
using value_type = std::string;
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_);
}
inline std::string to_string(const 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 boost::string_view& begin;
explicit range_buffer() = default;
~range_buffer() = default;
range_buffer& operator=(const range_buffer&) = default;
range_buffer(const range_buffer&) = default;
[[nodiscard("please use the returned value of the tag.")]]
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()
{
constexpr auto magic_tag = "8";
return this->operator[](magic_tag).empty() == false;
}
explicit operator bool()
{
return this->is_valid();
}
};
/// @brief visitor object which returns a fix::range_buffer instance.
class visitor final
{
struct impl;
std::unique_ptr<impl> impl_;
#ifndef OCL_FIX_HAS_IMPL
struct impl
{
};
#endif
public:
visitor();
~visitor();
/// @brief Alias of visit.
range_buffer operator()(const std::string& in);
/// @brief Visits 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);
};
} // namespace ocl::fix
inline std::ostream& operator<<(std::ostream& os, ocl::fix::range& r)
{
os << ocl::fix::to_string(r);
return os;
}
inline std::ostream& operator<<(std::ostream& os, const ocl::fix::range& r)
{
os << ocl::fix::to_string(r);
return os;
}
#endif // ifndef OCL_FIX_PARSER
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