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#include <mbgl/style/expression/is_constant.hpp>
namespace mbgl {
namespace style {
namespace expression {
bool isFeatureConstant(const Expression& expression) {
if (auto e = dynamic_cast<const CompoundExpressionBase*>(&expression)) {
const std::string name = e->getName();
optional<std::size_t> parameterCount = e->getParameterCount();
if (name == "get" && parameterCount && *parameterCount == 1) {
return false;
} else if (name == "has" && parameterCount && *parameterCount == 1) {
return false;
} else if (
name == "properties" ||
name == "geometry-type" ||
name == "id"
) {
return false;
}
}
bool featureConstant = true;
expression.eachChild([&](const Expression& e) {
if (featureConstant && !isFeatureConstant(e)) {
featureConstant = false;
}
});
return featureConstant;
}
bool isZoomConstant(const Expression& e) {
return isGlobalPropertyConstant(e, std::array<std::string, 1>{{"zoom"}});
}
} // namespace expression
} // namespace style
} // namespace mbgl
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