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#include "3party/jansson/myjansson.hpp"
#include <type_traits>
using namespace std;
namespace
{
template <typename T>
typename enable_if<is_integral<T>::value, void>::type ReadIntegral(json_t * root,
string const & field, T & result)
{
auto * val = my::GetJSONObligatoryField(root, field);
if (!json_is_number(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json number."));
result = static_cast<T>(json_integer_value(val));
}
template <typename T>
typename enable_if<is_integral<T>::value, void>::type ReadIntegralOptional(json_t * root,
string const & field,
T & result)
{
auto * val = my::GetJSONOptionalField(root, field);
if (!val)
{
result = 0;
return;
}
if (!json_is_number(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json number."));
result = static_cast<T>(json_integer_value(val));
}
} // namespace
namespace my
{
json_t * GetJSONObligatoryField(json_t * root, std::string const & field)
{
auto * value = my::GetJSONOptionalField(root, field);
if (!value)
MYTHROW(my::Json::Exception, ("Obligatory field", field, "is absent."));
return value;
}
json_t * GetJSONOptionalField(json_t * root, std::string const & field)
{
if (!json_is_object(root))
MYTHROW(my::Json::Exception, ("Bad json object while parsing", field));
return json_object_get(root, field.c_str());
}
} // namespace my
void FromJSONObject(json_t * root, string const & field, double & result)
{
auto * val = my::GetJSONObligatoryField(root, field);
if (!json_is_number(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json number."));
result = json_number_value(val);
}
void FromJSONObject(json_t * root, string const & field, int & result)
{
ReadIntegral(root, field, result);
}
void FromJSONObject(json_t * root, string const & field, int64_t & result)
{
ReadIntegral(root, field, result);
}
void FromJSONObjectOptionalField(json_t * root, string const & field, int & result)
{
ReadIntegralOptional(root, field, result);
}
void FromJSONObjectOptionalField(json_t * root, string const & field, int64_t & result)
{
ReadIntegralOptional(root, field, result);
}
void FromJSONObjectOptionalField(json_t * root, string const & field, double & result)
{
json_t * val = my::GetJSONOptionalField(root, field);
if (!val)
{
result = 0.0;
return;
}
if (!json_is_number(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json number."));
result = json_number_value(val);
}
void FromJSONObjectOptionalField(json_t * root, string const & field, bool & result, bool def)
{
json_t * val = my::GetJSONOptionalField(root, field);
if (!val)
{
result = def;
return;
}
if (!json_is_boolean(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a boolean value."));
result = json_is_true(val);
}
void FromJSONObjectOptionalField(json_t * root, string const & field, json_t *& result)
{
json_t * obj = my::GetJSONOptionalField(root, field);
if (!obj)
{
result = nullptr;
return;
}
if (!json_is_object(obj))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json object."));
FromJSON(obj, result);
}
void ToJSONObject(json_t & root, string const & field, double value)
{
json_object_set_new(&root, field.c_str(), json_real(value));
}
void ToJSONObject(json_t & root, string const & field, int value)
{
ToJSONObject(root, field, static_cast<int64_t>(value));
}
void ToJSONObject(json_t & root, std::string const & field, int64_t value)
{
json_object_set_new(&root, field.c_str(), json_integer(value));
}
void FromJSON(json_t * root, string & result)
{
if (!json_is_string(root))
MYTHROW(my::Json::Exception, ("The field must contain a json string."));
result = json_string_value(root);
}
void FromJSONObject(json_t * root, string const & field, string & result)
{
auto * val = my::GetJSONObligatoryField(root, field);
if (!json_is_string(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json string."));
result = json_string_value(val);
}
void ToJSONObject(json_t & root, string const & field, string const & value)
{
json_object_set_new(&root, field.c_str(), json_string(value.c_str()));
}
void FromJSONObjectOptionalField(json_t * root, string const & field, string & result)
{
auto * val = my::GetJSONOptionalField(root, field);
if (!val)
{
result.clear();
return;
}
if (!json_is_string(val))
MYTHROW(my::Json::Exception, ("The field", field, "must contain a json string."));
result = json_string_value(val);
}
namespace strings
{
void FromJSONObject(json_t * root, string const & field, UniString & result)
{
string s;
FromJSONObject(root, field, s);
result = strings::MakeUniString(s);
}
void ToJSONObject(json_t & root, string const & field, UniString const & value)
{
return ToJSONObject(root, field, strings::ToUtf8(value));
}
} // namespace strings
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