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/*
* File: fix/parser_impl.cpp
* 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.
*/
#define OCL_FIX_HAS_IMPL
#include <ocl/fix/parser.hpp>
namespace ocl::fix
{
namespace detail
{
inline const char* begin_fix() noexcept
{
return "FIX.4.2";
}
} // namespace detail
struct visitor::impl final
{
public:
static constexpr int soh = '\x01';
static constexpr char eq = '=';
static constexpr unsigned base = 10U;
explicit impl() = default;
~impl() = default;
impl& operator=(const impl&) = delete;
impl(const impl&) = delete;
/// @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 boost::string_view& in)
{
if (auto begin = detail::begin_fix(); begin != range_buffer::begin)
range_buffer::begin = begin;
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).to_string();
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).to_string();
if (ret.magic_.empty())
{
ret.magic_ = value;
ret.magic_len_ = value.size();
}
ret.message_[tag] = value;
off = soh_pos + 1;
}
return ret;
}
};
visitor::visitor() = default;
visitor::~visitor() = default;
/// \brief Alias of visit.
range_buffer visitor::operator()(const std::string& in)
{
return impl_->visit(in.data());
}
/// @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 visitor::visit(const std::string& in)
{
return impl_->visit(in.data());
}
} // namespace ocl::fix
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