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#include <mbgl/style/conversion.hpp>
namespace mbgl {
namespace style {
namespace conversion {
Result<Value> normalizeFilterValue(const std::string& key, const optional<Value>& value) {
if (!value) {
return Error { "filter expression value must be a boolean, number, or string" };
} else if (key != "$type") {
return *value;
} else if (*value == std::string("Point")) {
return Value(uint64_t(FeatureType::Point));
} else if (*value == std::string("LineString")) {
return Value(uint64_t(FeatureType::LineString));
} else if (*value == std::string("Polygon")) {
return Value(uint64_t(FeatureType::Polygon));
} else {
return Error { "value for $type filter must be Point, LineString, or Polygon" };
}
}
} // namespace conversion
} // namespace style
} // namespace mbgl
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