1 files changed, 46 insertions, 0 deletions
diff --git a/include/mbgl/style/conversion/color_ramp_property_value.hpp b/include/mbgl/style/conversion/color_ramp_property_value.hpp
new file mode 100644
index 0000000000..eeb9d0ae34
--- /dev/null
+++ b/include/mbgl/style/conversion/color_ramp_property_value.hpp
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <mbgl/style/color_ramp_property_value.hpp>
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/style/conversion/constant.hpp>
+#include <mbgl/style/conversion/function.hpp>
+#include <mbgl/style/conversion/expression.hpp>
+#include <mbgl/style/expression/value.hpp>
+#include <mbgl/style/expression/is_constant.hpp>
+#include <mbgl/style/expression/is_expression.hpp>
+#include <mbgl/style/expression/find_zoom_curve.hpp>
+
+namespace mbgl {
+namespace style {
+namespace conversion {
+
+template <>
+struct Converter<ColorRampPropertyValue> {
+    optional<ColorRampPropertyValue> operator()(const Convertible& value, Error& error) const {
+        if (isUndefined(value)) {
+            return ColorRampPropertyValue();
+        } else if (isExpression(value)) {
+            optional<std::unique_ptr<Expression>> expression = convert<std::unique_ptr<Expression>>(value, error, expression::type::Color);
+            if (!expression) {
+                return {};
+            }
+            assert(*expression);
+            if (!isFeatureConstant(**expression)) {
+                error = { "property expressions not supported" };
+                return {};
+            }
+            if (!isZoomConstant(**expression)) {
+                error = { "zoom expressions not supported" };
+                return {};
+            }
+            return {ColorRampPropertyValue(std::move(*expression))};
+        } else {
+            error = { "color ramp must be an expression" };
+            return {};
+        }
+    }
+};
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl