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/*
* This source code is released into the public domain.
*/
module;
#include <concepts>
#include <format>
#include <string>
#include <ucl.h>
export module nihil.ucl:type;
import :error;
namespace nihil::ucl {
// Our strongly-typed version of ::ucl_type.
export enum struct object_type {
object = UCL_OBJECT,
array = UCL_ARRAY,
integer = UCL_INT,
real = UCL_FLOAT,
string = UCL_STRING,
boolean = UCL_BOOLEAN,
time = UCL_TIME,
userdata = UCL_USERDATA,
null = UCL_NULL,
};
// Get the name of a type.
export auto str(object_type type) -> std::string_view {
using namespace std::literals;
switch (type) {
case object_type::object:
return "object"sv;
case object_type::array:
return "array"sv;
case object_type::integer:
return "integer"sv;
case object_type::real:
return "real"sv;
case object_type::string:
return "string"sv;
case object_type::boolean:
return "boolean"sv;
case object_type::time:
return "time"sv;
case object_type::userdata:
return "userdata"sv;
case object_type::null:
return "null"sv;
default:
// Don't fail here, since UCL might add more types that we
// don't know about.
return "unknown"sv;
}
}
// Concept of a UCL data type.
export template<typename T>
concept datatype = requires(T o) {
{ o.get_ucl_object() } -> std::convertible_to<::ucl_object_t const *>;
{ o.type() } -> std::same_as<object_type>;
{ T::ucl_type } -> std::convertible_to<object_type>;
};
// Exception thrown when a type assertion fails.
export struct type_mismatch : error {
type_mismatch(object_type expected_type, object_type actual_type)
: error(std::format("UCL type mismatch: expected type '{}' "
"!= actual type '{}'",
str(expected_type), str(actual_type)))
, _expected_type(expected_type)
, _actual_type(actual_type)
{}
// The type we expected.
auto expected_type(this type_mismatch const &self) -> object_type
{
return self._expected_type;
}
// The type we got.
auto actual_type(this type_mismatch const &self) -> object_type
{
return self._actual_type;
}
private:
object_type _expected_type;
object_type _actual_type;
};
} // namespace nihil::ucl
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