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#pragma once
#include <mbgl/style/data_driven_property_value.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/conversion/function.hpp>
#include <mbgl/style/expression/is_expression.hpp>
#include <mbgl/style/expression/is_constant.hpp>
#include <mbgl/style/expression/find_zoom_curve.hpp>
#include <mbgl/style/expression/literal.hpp>
#include <mbgl/style/expression/value.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <unordered_set>
namespace mbgl {
namespace style {
namespace conversion {
template <class T>
struct Converter<DataDrivenPropertyValue<T>> {
optional<DataDrivenPropertyValue<T>> operator()(const Convertible& value, Error& error) const {
using namespace mbgl::style::expression;
if (isUndefined(value)) {
return DataDrivenPropertyValue<T>();
} else if (isExpression(value)) {
ParsingContext ctx(valueTypeToExpressionType<T>());
ParseResult expression = ctx.parseLayerPropertyExpression(value);
if (!expression) {
error = { ctx.getCombinedErrors() };
return {};
}
bool featureConstant = isFeatureConstant(**expression);
bool zoomConstant = isZoomConstant(**expression);
if (featureConstant && !zoomConstant) {
return DataDrivenPropertyValue<T>(CameraFunction<T>(std::move(*expression)));
} else if (!featureConstant && zoomConstant) {
return DataDrivenPropertyValue<T>(SourceFunction<T>(std::move(*expression)));
} else if (!featureConstant && !zoomConstant) {
return DataDrivenPropertyValue<T>(CompositeFunction<T>(std::move(*expression)));
} else {
auto literal = dynamic_cast<Literal*>(expression->get());
assert(literal);
optional<T> constant = fromExpressionValue<T>(literal->getValue());
if (!constant) {
return {};
}
return DataDrivenPropertyValue<T>(*constant);
}
} else if (!isObject(value)) {
optional<T> constant = convert<T>(value, error);
if (!constant) {
return {};
}
return DataDrivenPropertyValue<T>(*constant);
} else if (!objectMember(value, "property")) {
optional<CameraFunction<T>> function = convert<CameraFunction<T>>(value, error);
if (!function) {
return {};
}
return DataDrivenPropertyValue<T>(*function);
} else {
optional<CompositeFunction<T>> composite = convert<CompositeFunction<T>>(value, error);
if (composite) {
return DataDrivenPropertyValue<T>(*composite);
}
optional<SourceFunction<T>> source = convert<SourceFunction<T>>(value, error);
if (!source) {
return {};
}
return DataDrivenPropertyValue<T>(*source);
}
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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