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#pragma once
#include <mbgl/style/function/exponential_stops.hpp>
#include <mbgl/style/function/interval_stops.hpp>
#include <mbgl/style/function/categorical_stops.hpp>
#include <mbgl/style/function/identity_stops.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/variant.hpp>
#include <string>
namespace mbgl {
namespace style {
template <class T>
class SourceFunction {
public:
using Stops = std::conditional_t<
util::Interpolatable<T>,
variant<
ExponentialStops<T>,
IntervalStops<T>,
CategoricalStops<T>,
IdentityStops<T>>,
variant<
IntervalStops<T>,
CategoricalStops<T>,
IdentityStops<T>>>;
SourceFunction(std::string property_, Stops stops_)
: property(std::move(property_)),
stops(std::move(stops_)) {
}
T evaluate(const GeometryTileFeature& feature) const {
optional<Value> v = feature.getValue(property);
if (!v) {
return T();
}
return stops.match([&] (const auto& s) {
return s.evaluate(*v);
});
}
friend bool operator==(const SourceFunction& lhs,
const SourceFunction& rhs) {
return lhs.property == rhs.property && lhs.stops == rhs.stops;
}
std::string property;
Stops stops;
};
} // namespace style
} // namespace mbgl
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