1 files changed, 57 insertions, 0 deletions
diff --git a/src/mbgl/style/property_parsing.hpp b/src/mbgl/style/property_parsing.hpp
new file mode 100644
index 0000000000..478e192898
--- /dev/null
+++ b/src/mbgl/style/property_parsing.hpp
@@ -0,0 +1,57 @@
+#ifndef MBGL_PROPERTY_PARSING
+#define MBGL_PROPERTY_PARSING
+
+#include <mbgl/style/class_properties.hpp>
+
+#include <mapbox/optional.hpp>
+#include <rapidjson/document.h>
+
+namespace mbgl {
+
+using JSVal = rapidjson::Value;
+
+template <typename T>
+using optional = mapbox::util::optional<T>;
+
+namespace detail {
+
+template <typename T>
+optional<T> parseProperty(const char* name, const JSVal&);
+
+template <typename T>
+optional<T> parseProperty(const char* name, const JSVal&, const JSVal& transition);
+
+}
+
+template <typename T>
+void parseProperty(const char* name, PropertyKey key, ClassProperties& properties, const JSVal& value) {
+    if (!value.HasMember(name))
+        return;
+
+    const optional<T> res = detail::parseProperty<T>(name, value[name]);
+
+    if (res) {
+        properties.set(key, *res);
+    }
+}
+
+template <typename T>
+void parseProperty(const char* name, PropertyKey key, ClassProperties& properties, const JSVal& value, const char* transitionName) {
+    if (!value.HasMember(name))
+        return;
+
+    const JSVal& noTransition = JSVal { rapidjson::kObjectType };
+
+    const optional<T> res = detail::parseProperty<T>(name, value[name],
+        value.HasMember(transitionName)
+            ? value[transitionName]
+            : noTransition);
+
+    if (res) {
+        properties.set(key, *res);
+    }
+}
+
+}
+
+#endif