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#pragma once
#include <mbgl/style/function.hpp>
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/constant.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <class T>
struct Converter<Function<T>> {
template <class V>
Result<Function<T>> operator()(const V& value) const {
if (!isObject(value)) {
return Error { "function must be an object" };
}
auto stopsValue = objectMember(value, "stops");
if (!stopsValue) {
return Error { "function value must specify stops" };
}
if (!isArray(*stopsValue)) {
return Error { "function stops must be an array" };
}
if (arrayLength(*stopsValue) == 0) {
return Error { "function must have at least one stop" };
}
std::vector<std::pair<float, T>> stops;
for (std::size_t i = 0; i < arrayLength(*stopsValue); ++i) {
const auto& stopValue = arrayMember(*stopsValue, i);
if (!isArray(stopValue)) {
return Error { "function stop must be an array" };
}
if (arrayLength(stopValue) != 2) {
return Error { "function stop must have two elements" };
}
optional<float> z = toNumber(arrayMember(stopValue, 0));
if (!z) {
return Error { "function stop zoom level must be a number" };
}
Result<T> v = convert<T>(arrayMember(stopValue, 1));
if (!v) {
return v.error();
}
stops.emplace_back(*z, *v);
}
auto baseValue = objectMember(value, "base");
if (!baseValue) {
return Function<T>(stops, 1.0f);
}
optional<float> base = toNumber(*baseValue);
if (!base) {
return Error { "function base must be a number"};
}
return Function<T>(stops, *base);
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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