Merge remote-tracking branch 'origin/master' into feature/custom-vector-source

1 files changed, 46 insertions, 0 deletions

diff --git a/include/mbgl/style/conversion/data_driven_property_value.hpp b/include/mbgl/style/conversion/data_driven_property_value.hpp
new file mode 100644
index 0000000000..83f44fdb27
--- /dev/null
+++ b/include/mbgl/style/conversion/data_driven_property_value.hpp
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <mbgl/style/data_driven_property_value.hpp>
+#include <mbgl/style/conversion.hpp>
+#include <mbgl/style/conversion/constant.hpp>
+#include <mbgl/style/conversion/function.hpp>
+
+namespace mbgl {
+namespace style {
+namespace conversion {
+
+template <class T>
+struct Converter<DataDrivenPropertyValue<T>> {
+    template <class V>
+    Result<DataDrivenPropertyValue<T>> operator()(const V& value) const {
+        if (isUndefined(value)) {
+            return {};
+        } else if (!isObject(value)) {
+            Result<T> constant = convert<T>(value);
+            if (!constant) {
+                return constant.error();
+            }
+            return DataDrivenPropertyValue<T>(*constant);
+        } else if (!objectMember(value, "property")) {
+            Result<CameraFunction<T>> function = convert<CameraFunction<T>>(value);
+            if (!function) {
+                return function.error();
+            }
+            return DataDrivenPropertyValue<T>(*function);
+        } else {
+            Result<CompositeFunction<T>> composite = convert<CompositeFunction<T>>(value);
+            if (composite) {
+                return DataDrivenPropertyValue<T>(*composite);
+            }
+            Result<SourceFunction<T>> source = convert<SourceFunction<T>>(value);
+            if (!source) {
+                return source.error();
+            }
+            return DataDrivenPropertyValue<T>(*source);
+        }
+    }
+};
+
+} // namespace conversion
+} // namespace style
+} // namespace mbgl