detail/conversions/from_json.hpp

#pragma once

#include <algorithm> // transform
#include <array> // array
#include <forward_list> // forward_list
#include <iterator> // inserter, front_inserter, end
#include <map> // map
#include <string> // string
#include <tuple> // tuple, make_tuple
#include <type_traits> // is_arithmetic, is_same, is_enum, underlying_type, is_convertible
#include <unordered_map> // unordered_map
#include <utility> // pair, declval
#include <valarray> // valarray

#include <nlohmann/detail/exceptions.hpp>
#include <nlohmann/detail/macro_scope.hpp>
#include <nlohmann/detail/meta/cpp_future.hpp>
#include <nlohmann/detail/meta/identity_tag.hpp>
#include <nlohmann/detail/meta/type_traits.hpp>
#include <nlohmann/detail/value_t.hpp>

namespace nlohmann
{
namespace detail
{
template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename std::nullptr_t& n)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_null()))
    {
        JSON_THROW(type_error::create(302, "type must be null, but is " + std::string(j.type_name()), j));
    }
    n = nullptr;
}

// overloads for basic_json template parameters
template < typename BasicJsonType, typename ArithmeticType,
           enable_if_t < std::is_arithmetic<ArithmeticType>::value&&
                         !std::is_same<ArithmeticType, typename BasicJsonType::boolean_t>::value,
                         int > = 0 >
void get_arithmetic_value(const BasicJsonType& j, ArithmeticType& val)
{
    switch (static_cast<value_t>(j))
    {
        case value_t::number_unsigned:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_unsigned_t*>());
            break;
        }
        case value_t::number_integer:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_integer_t*>());
            break;
        }
        case value_t::number_float:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_float_t*>());
            break;
        }

        case value_t::null:
        case value_t::object:
        case value_t::array:
        case value_t::string:
        case value_t::boolean:
        case value_t::binary:
        case value_t::discarded:
        default:
            JSON_THROW(type_error::create(302, "type must be number, but is " + std::string(j.type_name()), j));
    }
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::boolean_t& b)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_boolean()))
    {
        JSON_THROW(type_error::create(302, "type must be boolean, but is " + std::string(j.type_name()), j));
    }
    b = *j.template get_ptr<const typename BasicJsonType::boolean_t*>();
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::string_t& s)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_string()))
    {
        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j));
    }
    s = *j.template get_ptr<const typename BasicJsonType::string_t*>();
}

template <
    typename BasicJsonType, typename ConstructibleStringType,
    enable_if_t <
        is_constructible_string_type<BasicJsonType, ConstructibleStringType>::value&&
        !std::is_same<typename BasicJsonType::string_t,
                      ConstructibleStringType>::value,
        int > = 0 >
void from_json(const BasicJsonType& j, ConstructibleStringType& s)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_string()))
    {
        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j));
    }

    s = *j.template get_ptr<const typename BasicJsonType::string_t*>();
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_float_t& val)
{
    get_arithmetic_value(j, val);
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_unsigned_t& val)
{
    get_arithmetic_value(j, val);
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::number_integer_t& val)
{
    get_arithmetic_value(j, val);
}

template<typename BasicJsonType, typename EnumType,
         enable_if_t<std::is_enum<EnumType>::value, int> = 0>
void from_json(const BasicJsonType& j, EnumType& e)
{
    typename std::underlying_type<EnumType>::type val;
    get_arithmetic_value(j, val);
    e = static_cast<EnumType>(val);
}

// forward_list doesn't have an insert method
template<typename BasicJsonType, typename T, typename Allocator,
         enable_if_t<is_getable<BasicJsonType, T>::value, int> = 0>
void from_json(const BasicJsonType& j, std::forward_list<T, Allocator>& l)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }
    l.clear();
    std::transform(j.rbegin(), j.rend(),
                   std::front_inserter(l), [](const BasicJsonType & i)
    {
        return i.template get<T>();
    });
}

// valarray doesn't have an insert method
template<typename BasicJsonType, typename T,
         enable_if_t<is_getable<BasicJsonType, T>::value, int> = 0>
void from_json(const BasicJsonType& j, std::valarray<T>& l)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }
    l.resize(j.size());
    std::transform(j.begin(), j.end(), std::begin(l),
                   [](const BasicJsonType & elem)
    {
        return elem.template get<T>();
    });
}

template<typename BasicJsonType, typename T, std::size_t N>
auto from_json(const BasicJsonType& j, T (&arr)[N]) // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
-> decltype(j.template get<T>(), void())
{
    for (std::size_t i = 0; i < N; ++i)
    {
        arr[i] = j.at(i).template get<T>();
    }
}

template<typename BasicJsonType>
void from_json_array_impl(const BasicJsonType& j, typename BasicJsonType::array_t& arr, priority_tag<3> /*unused*/)
{
    arr = *j.template get_ptr<const typename BasicJsonType::array_t*>();
}

template<typename BasicJsonType, typename T, std::size_t N>
auto from_json_array_impl(const BasicJsonType& j, std::array<T, N>& arr,
                          priority_tag<2> /*unused*/)
-> decltype(j.template get<T>(), void())
{
    for (std::size_t i = 0; i < N; ++i)
    {
        arr[i] = j.at(i).template get<T>();
    }
}

template<typename BasicJsonType, typename ConstructibleArrayType,
         enable_if_t<
             std::is_assignable<ConstructibleArrayType&, ConstructibleArrayType>::value,
             int> = 0>
auto from_json_array_impl(const BasicJsonType& j, ConstructibleArrayType& arr, priority_tag<1> /*unused*/)
-> decltype(
    arr.reserve(std::declval<typename ConstructibleArrayType::size_type>()),
    j.template get<typename ConstructibleArrayType::value_type>(),
    void())
{
    using std::end;

    ConstructibleArrayType ret;
    ret.reserve(j.size());
    std::transform(j.begin(), j.end(),
                   std::inserter(ret, end(ret)), [](const BasicJsonType & i)
    {
        // get<BasicJsonType>() returns *this, this won't call a from_json
        // method when value_type is BasicJsonType
        return i.template get<typename ConstructibleArrayType::value_type>();
    });
    arr = std::move(ret);
}

template<typename BasicJsonType, typename ConstructibleArrayType,
         enable_if_t<
             std::is_assignable<ConstructibleArrayType&, ConstructibleArrayType>::value,
             int> = 0>
void from_json_array_impl(const BasicJsonType& j, ConstructibleArrayType& arr,
                          priority_tag<0> /*unused*/)
{
    using std::end;

    ConstructibleArrayType ret;
    std::transform(
        j.begin(), j.end(), std::inserter(ret, end(ret)),
        [](const BasicJsonType & i)
    {
        // get<BasicJsonType>() returns *this, this won't call a from_json
        // method when value_type is BasicJsonType
        return i.template get<typename ConstructibleArrayType::value_type>();
    });
    arr = std::move(ret);
}

template < typename BasicJsonType, typename ConstructibleArrayType,
           enable_if_t <
               is_constructible_array_type<BasicJsonType, ConstructibleArrayType>::value&&
               !is_constructible_object_type<BasicJsonType, ConstructibleArrayType>::value&&
               !is_constructible_string_type<BasicJsonType, ConstructibleArrayType>::value&&
               !std::is_same<ConstructibleArrayType, typename BasicJsonType::binary_t>::value&&
               !is_basic_json<ConstructibleArrayType>::value,
               int > = 0 >
auto from_json(const BasicJsonType& j, ConstructibleArrayType& arr)
-> decltype(from_json_array_impl(j, arr, priority_tag<3> {}),
j.template get<typename ConstructibleArrayType::value_type>(),
void())
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }

    from_json_array_impl(j, arr, priority_tag<3> {});
}

template < typename BasicJsonType, typename T, std::size_t... Idx >
std::array<T, sizeof...(Idx)> from_json_inplace_array_impl(BasicJsonType&& j,
        identity_tag<std::array<T, sizeof...(Idx)>> /*unused*/, index_sequence<Idx...> /*unused*/)
{
    return { { std::forward<BasicJsonType>(j).at(Idx).template get<T>()... } };
}

template < typename BasicJsonType, typename T, std::size_t N >
auto from_json(BasicJsonType&& j, identity_tag<std::array<T, N>> tag)
-> decltype(from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {}))
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }

    return from_json_inplace_array_impl(std::forward<BasicJsonType>(j), tag, make_index_sequence<N> {});
}

template<typename BasicJsonType>
void from_json(const BasicJsonType& j, typename BasicJsonType::binary_t& bin)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_binary()))
    {
        JSON_THROW(type_error::create(302, "type must be binary, but is " + std::string(j.type_name()), j));
    }

    bin = *j.template get_ptr<const typename BasicJsonType::binary_t*>();
}

template<typename BasicJsonType, typename ConstructibleObjectType,
         enable_if_t<is_constructible_object_type<BasicJsonType, ConstructibleObjectType>::value, int> = 0>
void from_json(const BasicJsonType& j, ConstructibleObjectType& obj)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_object()))
    {
        JSON_THROW(type_error::create(302, "type must be object, but is " + std::string(j.type_name()), j));
    }

    ConstructibleObjectType ret;
    const auto* inner_object = j.template get_ptr<const typename BasicJsonType::object_t*>();
    using value_type = typename ConstructibleObjectType::value_type;
    std::transform(
        inner_object->begin(), inner_object->end(),
        std::inserter(ret, ret.begin()),
        [](typename BasicJsonType::object_t::value_type const & p)
    {
        return value_type(p.first, p.second.template get<typename ConstructibleObjectType::mapped_type>());
    });
    obj = std::move(ret);
}

// overload for arithmetic types, not chosen for basic_json template arguments
// (BooleanType, etc..); note: Is it really necessary to provide explicit
// overloads for boolean_t etc. in case of a custom BooleanType which is not
// an arithmetic type?
template < typename BasicJsonType, typename ArithmeticType,
           enable_if_t <
               std::is_arithmetic<ArithmeticType>::value&&
               !std::is_same<ArithmeticType, typename BasicJsonType::number_unsigned_t>::value&&
               !std::is_same<ArithmeticType, typename BasicJsonType::number_integer_t>::value&&
               !std::is_same<ArithmeticType, typename BasicJsonType::number_float_t>::value&&
               !std::is_same<ArithmeticType, typename BasicJsonType::boolean_t>::value,
               int > = 0 >
void from_json(const BasicJsonType& j, ArithmeticType& val)
{
    switch (static_cast<value_t>(j))
    {
        case value_t::number_unsigned:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_unsigned_t*>());
            break;
        }
        case value_t::number_integer:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_integer_t*>());
            break;
        }
        case value_t::number_float:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::number_float_t*>());
            break;
        }
        case value_t::boolean:
        {
            val = static_cast<ArithmeticType>(*j.template get_ptr<const typename BasicJsonType::boolean_t*>());
            break;
        }

        case value_t::null:
        case value_t::object:
        case value_t::array:
        case value_t::string:
        case value_t::binary:
        case value_t::discarded:
        default:
            JSON_THROW(type_error::create(302, "type must be number, but is " + std::string(j.type_name()), j));
    }
}

template<typename BasicJsonType, typename... Args, std::size_t... Idx>
std::tuple<Args...> from_json_tuple_impl_base(BasicJsonType&& j, index_sequence<Idx...> /*unused*/)
{
    return std::make_tuple(std::forward<BasicJsonType>(j).at(Idx).template get<Args>()...);
}

template < typename BasicJsonType, class A1, class A2 >
std::pair<A1, A2> from_json_tuple_impl(BasicJsonType&& j, identity_tag<std::pair<A1, A2>> /*unused*/, priority_tag<0> /*unused*/)
{
    return {std::forward<BasicJsonType>(j).at(0).template get<A1>(),
            std::forward<BasicJsonType>(j).at(1).template get<A2>()};
}

template<typename BasicJsonType, typename A1, typename A2>
void from_json_tuple_impl(BasicJsonType&& j, std::pair<A1, A2>& p, priority_tag<1> /*unused*/)
{
    p = from_json_tuple_impl(std::forward<BasicJsonType>(j), identity_tag<std::pair<A1, A2>> {}, priority_tag<0> {});
}

template<typename BasicJsonType, typename... Args>
std::tuple<Args...> from_json_tuple_impl(BasicJsonType&& j, identity_tag<std::tuple<Args...>> /*unused*/, priority_tag<2> /*unused*/)
{
    return from_json_tuple_impl_base<BasicJsonType, Args...>(std::forward<BasicJsonType>(j), index_sequence_for<Args...> {});
}

template<typename BasicJsonType, typename... Args>
void from_json_tuple_impl(BasicJsonType&& j, std::tuple<Args...>& t, priority_tag<3> /*unused*/)
{
    t = from_json_tuple_impl_base<BasicJsonType, Args...>(std::forward<BasicJsonType>(j), index_sequence_for<Args...> {});
}

template<typename BasicJsonType, typename TupleRelated>
auto from_json(BasicJsonType&& j, TupleRelated&& t)
-> decltype(from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), priority_tag<3> {}))
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }

    return from_json_tuple_impl(std::forward<BasicJsonType>(j), std::forward<TupleRelated>(t), priority_tag<3> {});
}

template < typename BasicJsonType, typename Key, typename Value, typename Compare, typename Allocator,
           typename = enable_if_t < !std::is_constructible <
                                        typename BasicJsonType::string_t, Key >::value >>
void from_json(const BasicJsonType& j, std::map<Key, Value, Compare, Allocator>& m)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }
    m.clear();
    for (const auto& p : j)
    {
        if (JSON_HEDLEY_UNLIKELY(!p.is_array()))
        {
            JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(p.type_name()), j));
        }
        m.emplace(p.at(0).template get<Key>(), p.at(1).template get<Value>());
    }
}

template < typename BasicJsonType, typename Key, typename Value, typename Hash, typename KeyEqual, typename Allocator,
           typename = enable_if_t < !std::is_constructible <
                                        typename BasicJsonType::string_t, Key >::value >>
void from_json(const BasicJsonType& j, std::unordered_map<Key, Value, Hash, KeyEqual, Allocator>& m)
{
    if (JSON_HEDLEY_UNLIKELY(!j.is_array()))
    {
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name()), j));
    }
    m.clear();
    for (const auto& p : j)
    {
        if (JSON_HEDLEY_UNLIKELY(!p.is_array()))
        {
            JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(p.type_name()), j));
        }
        m.emplace(p.at(0).template get<Key>(), p.at(1).template get<Value>());
    }
}

struct from_json_fn
{
    template<typename BasicJsonType, typename T>
    auto operator()(const BasicJsonType& j, T&& val) const
    noexcept(noexcept(from_json(j, std::forward<T>(val))))
    -> decltype(from_json(j, std::forward<T>(val)))
    {
        return from_json(j, std::forward<T>(val));
    }
};
}  // namespace detail

/// namespace to hold default `from_json` function
/// to see why this is required:
/// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4381.html
namespace // NOLINT(cert-dcl59-cpp,fuchsia-header-anon-namespaces,google-build-namespaces)
{
constexpr const auto& from_json = detail::static_const<detail::from_json_fn>::value; // NOLINT(misc-definitions-in-headers)
} // namespace
} // namespace nlohmann