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#pragma once
#include <mbgl/style/function/camera_function.hpp>
#include <mbgl/style/function/source_function.hpp>
#include <mbgl/style/function/composite_function.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/value.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <class T>
optional<optional<T>> convertDefaultValue(const Convertible& value, Error& error) {
auto defaultValueValue = objectMember(value, "default");
if (!defaultValueValue) {
return optional<T>();
}
auto defaultValue = convert<T>(*defaultValueValue, error);
if (!defaultValue) {
error = { R"(wrong type for "default": )" + error.message };
return {};
}
return { *defaultValue };
}
optional<std::unique_ptr<expression::Expression>> convertCameraFunctionToExpression(expression::type::Type, const Convertible&, Error&);
optional<std::unique_ptr<expression::Expression>> convertSourceFunctionToExpression(expression::type::Type, const Convertible&, Error&);
optional<std::unique_ptr<expression::Expression>> convertCompositeFunctionToExpression(expression::type::Type, const Convertible&, Error&);
template <class T>
struct Converter<CameraFunction<T>> {
optional<CameraFunction<T>> operator()(const Convertible& value, Error& error) const {
auto expression = convertCameraFunctionToExpression(expression::valueTypeToExpressionType<T>(), value, error);
if (!expression) {
return {};
}
return CameraFunction<T>(std::move(*expression), false);
}
};
template <class T>
struct Converter<SourceFunction<T>> {
optional<SourceFunction<T>> operator()(const Convertible& value, Error& error) const {
auto expression = convertSourceFunctionToExpression(expression::valueTypeToExpressionType<T>(), value, error);
if (!expression) {
return {};
}
auto defaultValue = convertDefaultValue<T>(value, error);
if (!defaultValue) {
return {};
}
return SourceFunction<T>(std::move(*expression), *defaultValue);
}
};
template <class T>
struct Converter<CompositeFunction<T>> {
optional<CompositeFunction<T>> operator()(const Convertible& value, Error& error) const {
auto expression = convertCompositeFunctionToExpression(expression::valueTypeToExpressionType<T>(), value, error);
if (!expression) {
return {};
}
auto defaultValue = convertDefaultValue<T>(value, error);
if (!defaultValue) {
return {};
}
return CompositeFunction<T>(std::move(*expression), *defaultValue);
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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