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// Copyright Maarten L. Hekkelman, 2019
// 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)
#pragma once
/// \file
/// various implementations of the from_element function that return the data contained in a zeep::json::element (JSON) object
#include <zeep/config.hpp>
#include <zeep/json/factory.hpp>
namespace zeep::json::detail
{
template<typename E>
void from_element(const E& e, std::nullptr_t& n)
{
if (not e.is_null())
throw std::runtime_error("Type should have been null but was " + e.type_name());
n = nullptr;
}
template<typename E, typename T,
std::enable_if_t<std::is_arithmetic_v<T> and not std::is_same_v<T, bool>, int> = 0>
void get_number(const E& e, T& v)
{
switch (e.type())
{
case value_type::number_int:
v = static_cast<T>(*e.template get_ptr<const typename E::int_type*>());
break;
case value_type::number_float:
v = static_cast<T>(*e.template get_ptr<const typename E::float_type*>());
break;
default:
throw std::runtime_error("Type should have been number but was " + e.type_name());
break;
}
}
template<typename E>
void from_element(const E& e, typename E::boolean_type& b)
{
if (not e.is_boolean())
throw std::runtime_error("Type should have been boolean but was" + e.type_name());
b = *e.template get_ptr<const typename E::boolean_type*>();
}
// template<typename E>
// void from_element(const E& e, typename E::string_type& s)
// {
// if (not e.is_string())
// throw std::runtime_error("Type should have been string but was " + e.type_name());
// s = *e.template get_ptr<const typename E::string_type*>();
// }
template<typename E>
void from_element(const E& e, std::string& s)
{
if (not e.is_string())
throw std::runtime_error("Type should have been string but was " + e.type_name());
s = *e.template get_ptr<const typename E::string_type*>();
}
template<typename E>
void from_element(const E& e, typename E::int_type& i)
{
get_number(e, i);
}
template<typename E>
void from_element(const E& e, typename E::float_type& f)
{
get_number(e, f);
}
template<typename E, typename A,
std::enable_if_t<
std::is_arithmetic_v<A> and
not std::is_same_v<A, typename E::boolean_type> and
not std::is_same_v<A, typename E::int_type> and
not std::is_same_v<A, typename E::float_type>, int> = 0>
void from_element(const E& e, A& v)
{
switch (e.type())
{
case value_type::boolean: v = static_cast<A>(*e.template get_ptr<const typename E::boolean_type*>()); break;
case value_type::number_int: v = static_cast<A>(*e.template get_ptr<const typename E::int_type*>()); break;
case value_type::number_float: v = static_cast<A>(*e.template get_ptr<const typename E::float_type*>()); break;
default: throw std::runtime_error("Type should have been number but was " + e.type_name()); break;
}
}
template<typename E, typename Enum, std::enable_if_t<std::is_enum_v<Enum>, int> = 0>
void from_element(const E& e, Enum &en)
{
if (value_serializer<Enum>::empty())
{
typename std::underlying_type_t<Enum> v;
get_number(e, v);
en = static_cast<Enum>(v);
}
else
{
if (not e.is_string())
throw std::runtime_error("Type should have been string but was " + e.type_name());
auto s = e.template get_ptr<const typename E::string_type*>();
en = value_serializer<Enum>::from_string(*s);
}
}
// arrays
// nice trick to enforce order in template selection
template<unsigned N> struct priority_tag : priority_tag < N - 1 > {};
template<> struct priority_tag<0> {};
template<typename E>
void from_element_array_impl(const E& e, typename E::array_type& arr, priority_tag<3>)
{
arr = *e.template get_ptr<const typename E::array_type*>();
}
template<typename E, typename T, size_t N>
auto from_element_array_impl(const E& e, std::array<T, N>& arr, priority_tag<2>)
-> decltype(e.template as<T>(), void())
{
for (size_t i = 0; i < N; ++i)
arr[i] = e.at(i).template as<T>();
}
template<typename E, typename A>
auto from_element_array_impl(const E& e, A& arr, priority_tag<1>)
-> decltype(
arr.reserve(std::declval<typename A::size_type>()),
e.template as<typename A::value_type>(),
void()
)
{
arr.reserve(e.size());
std::transform(e.begin(), e.end(), std::inserter(arr, std::end(arr)),
[](const E& i)
{
return i.template as<typename A::value_type>();
});
}
template<typename E, typename A>
void from_element_array_impl(const E& e, A& arr, priority_tag<0>)
{
std::transform(e.begin(), e.end(), std::inserter(arr, std::end(arr)),
[](const E& i)
{
return i.template as<typename A::value_type>();
});
}
template<typename E, typename A,
std::enable_if_t<
is_constructible_array_type_v<E, A>, int> = 0>
void from_element(const E& e, A& arr)
{
if (not e.is_array())
throw std::runtime_error("Type should have been array but was " + e.type_name());
from_element_array_impl(e, arr, priority_tag<3>{});
}
struct from_element_fn
{
template<typename T>
auto operator()(const element& j, T& val) const noexcept(noexcept(from_element(j, val)))
-> decltype(from_element(j, val), void())
{
return from_element(j, val);
}
};
namespace
{
constexpr const auto& from_element = typename ::zeep::json::detail::from_element_fn{};
}
}
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