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apply changes to json.hpp.re2c

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This commit is contained in:
Théo DELRIEU 2017-01-15 21:01:29 +01:00
parent 68081cd112
commit 794dae8911
1 changed files with 125 additions and 66 deletions
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183
src/json.hpp.re2c
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@ -168,7 +168,7 @@ using is_unscoped_enum =
namespace detail
{
template <typename Json> std::string type_name(Json const &j)
template <typename Json> std::string type_name(const Json &j)
{
switch (j.m_type)
{
@ -189,6 +189,11 @@ template <typename Json> std::string type_name(Json const &j)
}
}
// dispatch utility (taken from ranges-v3)
template <unsigned N> struct priority_tag : priority_tag<N - 1> {};
template <> struct priority_tag<0> {};
// This is an experiment. I need this to move constructors out of basic_json.
// I'm sure there is a better way, but this might need a big basic_json refactoring
template <value_t> struct external_constructor;
@ -491,14 +496,15 @@ template <typename Json, typename ArithmeticType,
not std::is_same<ArithmeticType,
typename Json::boolean_t>::value,
int> = 0>
void get_arithmetic_value(Json const &j, ArithmeticType &val)
void get_arithmetic_value(const Json &j, ArithmeticType &val)
{
if (j.is_number_integer())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_integer_t*>();
else if (j.is_number_unsigned())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_unsigned_t*>();
// unsigned must be checked first, since is_number_integer() == true for unsigned
if (j.is_number_unsigned())
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_unsigned_t*>());
else if (j.is_number_integer())
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_integer_t*>());
else if (j.is_number_float())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_float_t*>();
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_float_t*>());
else
throw std::domain_error("type must be number, but is " + type_name(j));
}
@ -522,7 +528,7 @@ template <typename Json, typename FloatType,
enable_if_t<std::is_floating_point<FloatType>::value, int> = 0>
void to_json(Json &j, FloatType val) noexcept
{
external_constructor<value_t::number_float>::construct(j, val);
external_constructor<value_t::number_float>::construct(j, static_cast<typename Json::number_float_t>(val));
}
@ -533,7 +539,7 @@ template <
int> = 0>
void to_json(Json &j, CompatibleNumberUnsignedType val) noexcept
{
external_constructor<value_t::number_unsigned>::construct(j, val);
external_constructor<value_t::number_unsigned>::construct(j, static_cast<typename Json::number_unsigned_t>(val));
}
template <
@ -543,7 +549,7 @@ template <
int> = 0>
void to_json(Json &j, CompatibleNumberIntegerType val) noexcept
{
external_constructor<value_t::number_integer>::construct(j, val);
external_constructor<value_t::number_integer>::construct(j, static_cast<typename Json::number_integer_t>(val));
}
template <typename Json, typename UnscopedEnumType,
@ -559,7 +565,7 @@ template <
is_compatible_array_type<Json, CompatibleArrayType>::value or
std::is_same<typename Json::array_t, CompatibleArrayType>::value,
int> = 0>
void to_json(Json &j, CompatibleArrayType const &arr)
void to_json(Json &j, const CompatibleArrayType &arr)
{
external_constructor<value_t::array>::construct(j, arr);
}
@ -568,48 +574,48 @@ template <
typename Json, typename CompatibleObjectType,
enable_if_t<is_compatible_object_type<Json, CompatibleObjectType>::value,
int> = 0>
void to_json(Json &j, CompatibleObjectType const &arr)
void to_json(Json &j, const CompatibleObjectType &arr)
{
external_constructor<value_t::object>::construct(j, arr);
}
template <typename Json>
void from_json(Json const& j, typename Json::boolean_t& b)
void from_json(const Json & j, typename Json::boolean_t& b)
{
if (!j.is_boolean())
throw std::domain_error("type must be boolean, but is " + type_name(j));
b = *const_cast<Json&>(j).template get_ptr<typename Json::boolean_t*>();
b = *j.template get_ptr<const typename Json::boolean_t*>();
}
template <typename Json>
void from_json(Json const& j, typename Json::string_t& s)
void from_json(const Json & j, typename Json::string_t& s)
{
if (!j.is_string())
throw std::domain_error("type must be string, but is " + type_name(j));
s = *const_cast<Json&>(j).template get_ptr<typename Json::string_t*>();
s = *j.template get_ptr<const typename Json::string_t*>();
}
template <typename Json>
void from_json(Json const& j, typename Json::number_float_t& val)
void from_json(const Json & j, typename Json::number_float_t& val)
{
get_arithmetic_value(j, val);
}
template <typename Json>
void from_json(Json const& j, typename Json::number_unsigned_t& val)
void from_json(const Json & j, typename Json::number_unsigned_t& val)
{
get_arithmetic_value(j, val);
}
template <typename Json>
void from_json(Json const& j, typename Json::number_integer_t& val)
void from_json(const Json & j, typename Json::number_integer_t& val)
{
get_arithmetic_value(j, val);
}
template <typename Json, typename UnscopedEnumType,
enable_if_t<is_unscoped_enum<UnscopedEnumType>::value, int> = 0>
void from_json(Json const &j, UnscopedEnumType& e)
void from_json(const Json &j, UnscopedEnumType& e)
{
typename std::underlying_type<UnscopedEnumType>::type val = e;
get_arithmetic_value(j, val);
@ -617,16 +623,16 @@ void from_json(Json const &j, UnscopedEnumType& e)
}
template <typename Json>
void from_json(Json const &j, typename Json::array_t &arr)
void from_json(const Json &j, typename Json::array_t &arr)
{
if (!j.is_array())
throw std::domain_error("type must be array, but is " + type_name(j));
arr = *const_cast<Json&>(j).template get_ptr<typename Json::array_t*>();
arr = *j.template get_ptr<const typename Json::array_t*>();
}
// forward_list doesn't have an insert method, TODO find a way to avoid including forward_list
template <typename Json, typename T, typename Allocator>
void from_json(Json const&j, std::forward_list<T, Allocator>& l)
void from_json(const Json &j, std::forward_list<T, Allocator>& l)
{
// do not perform the check when user wants to retrieve jsons
// (except when it's null.. ?)
@ -641,13 +647,47 @@ void from_json(Json const&j, std::forward_list<T, Allocator>& l)
l.push_front(it->template get<T>());
}
template <typename Json, typename CompatibleArrayType>
void from_json_array_impl(const Json &j, CompatibleArrayType &arr, priority_tag<0>)
{
using std::begin;
using std::end;
std::transform(
j.begin(), j.end(), std::inserter(arr, end(arr)), [](const Json &i)
{
// get<Json>() returns *this, this won't call a from_json method when
// value_type is Json
return i.template get<typename CompatibleArrayType::value_type>();
});
}
template <typename Json, typename CompatibleArrayType>
auto from_json_array_impl(const Json &j, CompatibleArrayType &arr, priority_tag<1>)
-> decltype(
arr.reserve(std::declval<typename CompatibleArrayType::size_type>()),
void())
{
using std::begin;
using std::end;
arr.reserve(j.size());
std::transform(
j.begin(), j.end(), std::inserter(arr, end(arr)), [](const Json &i)
{
// get<Json>() returns *this, this won't call a from_json method when
// value_type is Json
return i.template get<typename CompatibleArrayType::value_type>();
});
}
template <
typename Json, typename CompatibleArrayType,
enable_if_t<is_compatible_array_type<Json, CompatibleArrayType>::value and
not std::is_same<typename Json::array_t,
CompatibleArrayType>::value,
int> = 0>
void from_json(Json const &j, CompatibleArrayType &arr)
void from_json(const Json &j, CompatibleArrayType &arr)
{
if (j.is_null())
throw std::domain_error("type must be array, but is " + type_name(j));
@ -657,16 +697,7 @@ void from_json(Json const &j, CompatibleArrayType &arr)
if (!j.is_array())
throw std::domain_error("type must be array, but is " + type_name(j));
}
using std::begin;
using std::end;
std::transform(
j.begin(), j.end(), std::inserter(arr, end(arr)), [](Json const &i)
{
// get<Json>() returns *this, this won't call a from_json method when
// value_type is Json
return i.template get<typename CompatibleArrayType::value_type>();
});
from_json_array_impl(j, arr, priority_tag<1>{});
}
@ -674,12 +705,12 @@ template <
typename Json, typename CompatibleObjectType,
enable_if_t<is_compatible_object_type<Json, CompatibleObjectType>::value,
int> = 0>
void from_json(Json const &j, CompatibleObjectType &obj)
void from_json(const Json &j, CompatibleObjectType &obj)
{
if (!j.is_object())
throw std::domain_error("type must be object, but is " + type_name(j));
auto inner_object = const_cast<Json&>(j).template get_ptr<typename Json::object_t*>();
auto inner_object = j.template get_ptr<const typename Json::object_t*>();
using std::begin;
using std::end;
// we could avoid the assignment, but this might require a for loop, which
@ -700,16 +731,16 @@ template <
not std::is_same<ArithmeticType, typename Json::number_float_t>::value and
not std::is_same<ArithmeticType, typename Json::boolean_t>::value,
int> = 0>
void from_json(Json const &j, ArithmeticType &val)
void from_json(const Json &j, ArithmeticType &val)
{
if (j.is_number_integer())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_integer_t*>();
else if (j.is_number_unsigned())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_unsigned_t*>();
if (j.is_number_unsigned())
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_unsigned_t*>());
else if (j.is_number_integer())
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_integer_t*>());
else if (j.is_number_float())
val = *const_cast<Json&>(j).template get_ptr<typename Json::number_float_t*>();
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::number_float_t*>());
else if (j.is_boolean())
val = *const_cast<Json&>(j).template get_ptr<typename Json::boolean_t*>();
val = static_cast<ArithmeticType>(*j.template get_ptr<const typename Json::boolean_t*>());
else
throw std::domain_error("type must be number, but is " + type_name(j));
}
@ -717,23 +748,52 @@ void from_json(Json const &j, ArithmeticType &val)
struct to_json_fn
{
template <typename Json, typename T>
constexpr auto operator()(Json&& j, T&& val) const
noexcept(noexcept(to_json(std::forward<Json>(j), std::forward<T>(val))))
-> decltype(to_json(std::forward<Json>(j), std::forward<T>(val)),
auto call(Json& j, T&& val, priority_tag<1>) const
noexcept(noexcept(to_json(j, std::forward<T>(val))))
-> decltype(to_json(j, std::forward<T>(val)),
void())
{
return to_json(std::forward<Json>(j), std::forward<T>(val));
return to_json(j, std::forward<T>(val));
}
template <typename Json, typename T>
void call(Json&, T&&, priority_tag<0>) const noexcept
{
static_assert(sizeof(Json) == 0, "to_json method in T's namespace can not be called");
}
public:
template <typename Json, typename T>
void operator()(Json &j, T &&val) const
noexcept(noexcept(std::declval<to_json_fn>().call(j, std::forward<T>(val), priority_tag<1>{})))
{
return call(j, std::forward<T>(val), priority_tag<1>{});
}
};
struct from_json_fn
{
private:
template <typename Json, typename T>
constexpr auto operator()(Json&& j, T& val) const
noexcept(noexcept(from_json(std::forward<Json>(j), val)))
-> decltype(from_json(std::forward<Json>(j), val), void())
auto call(const Json &j, T &val, priority_tag<1>) const
noexcept(noexcept(from_json(j, val)))
-> decltype(from_json(j, val), void())
{
return from_json(std::forward<Json>(j), val);
return from_json(j, val);
}
template <typename Json, typename T>
void call(const Json &, T&, priority_tag<0>) const noexcept
{
static_assert(sizeof(Json) == 0, "from_json method in T's namespace can not be called");
}
public:
template <typename Json, typename T>
void operator()(const Json &j, T &val) const
noexcept(noexcept(std::declval<from_json_fn>().call(j, val, priority_tag<1>{})))
{
return call(j, val, priority_tag<1>{});
}
};
@ -756,7 +816,6 @@ struct DecimalSeparator : std::numpunct<char>
return '.';
}
};
}
// taken from ranges-v3
@ -772,8 +831,8 @@ constexpr T static_const<T>::value;
inline namespace
{
constexpr auto const& to_json = static_const<detail::to_json_fn>::value;
constexpr auto const& from_json = static_const<detail::from_json_fn>::value;
constexpr const auto & to_json = static_const<detail::to_json_fn>::value;
constexpr const auto & from_json = static_const<detail::from_json_fn>::value;
}
// default JSONSerializer template argument, doesn't care about template argument
@ -788,7 +847,8 @@ struct adl_serializer
}
template <typename Json, typename T>
static void to_json(Json& j, T&& val)
static void to_json(Json &j, T &&val) noexcept(
noexcept(::nlohmann::to_json(j, std::forward<T>(val))))
{
::nlohmann::to_json(j, std::forward<T>(val));
}
@ -888,7 +948,7 @@ class basic_json
{
private:
template <::nlohmann::value_t> friend struct detail::external_constructor;
template <typename Json> friend std::string detail::type_name(Json const &);
template <typename Json> friend std::string detail::type_name(const Json &);
/// workaround type for MSVC
using basic_json_t = basic_json<ObjectType, ArrayType, StringType,
BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType,
@ -2967,16 +3027,16 @@ class basic_json
uncvref_t<T>>::value,
int> = 0>
// do we really want the uncvref ? if a user call get<int &>, shouldn't we
// i know there is a special behaviour for boolean_t* and such
// static assert ?
// i know there is a special behaviour for boolean_t* and such
auto get() const noexcept(noexcept(JSONSerializer<uncvref_t<T>>::from_json(
std::declval<basic_json_t const &>(), std::declval<uncvref_t<T> &>())))
std::declval<const basic_json_t &>(), std::declval<uncvref_t<T> &>())))
-> uncvref_t<T>
{
using type = uncvref_t<T>;
static_assert(std::is_default_constructible<type>::value &&
static_assert(std::is_default_constructible<type>::value and
std::is_copy_constructible<type>::value,
"user-defined types must be DefaultConstructible and "
"Types must be DefaultConstructible and "
"CopyConstructible when used with get");
type ret;
JSONSerializer<type>::from_json(*this, ret);
@ -2992,12 +3052,11 @@ class basic_json
detail::has_non_default_from_json<basic_json_t,
uncvref_t<T>>::value,
int> = 0>
constexpr uncvref_t<T> get() const noexcept(noexcept(JSONSerializer<T>::from_json(std::declval<basic_json_t const&>())))
uncvref_t<T> get() const noexcept(noexcept(JSONSerializer<T>::from_json(std::declval<const basic_json_t &>())))
{
return JSONSerializer<T>::from_json(*this);
}
// TODO what to do with those...
/*!
@brief get a pointer value (explicit)