1 files changed, 35 insertions, 0 deletions
diff --git a/src/mbgl/style/function/categorical_stops.cpp b/src/mbgl/style/function/categorical_stops.cpp
new file mode 100644
index 0000000000..bcdf170f17
--- /dev/null
+++ b/src/mbgl/style/function/categorical_stops.cpp
@@ -0,0 +1,35 @@
+#include <mbgl/style/function/categorical_stops.hpp>
+#include <mbgl/util/color.hpp>
+
+#include <array>
+
+namespace mbgl {
+namespace style {
+
+optional<CategoricalValue> categoricalValue(const Value& value) {
+    return value.match(
+        [] (bool t) { return optional<CategoricalValue>(t); },
+        [] (uint64_t t) { return optional<CategoricalValue>(int64_t(t)); },
+        [] (int64_t t) { return optional<CategoricalValue>(t); },
+        [] (double t) { return optional<CategoricalValue>(int64_t(t)); },
+        [] (const std::string& t) { return optional<CategoricalValue>(t); },
+        [] (const auto&) { return optional<CategoricalValue>(); }
+    );
+}
+
+template <class T>
+T CategoricalStops<T>::evaluate(const Value& value) const {
+    auto v = categoricalValue(value);
+    if (!v) {
+        return defaultValue;
+    }
+    auto it = stops.find(*v);
+    return it == stops.end() ? defaultValue : it->second;
+}
+
+template class CategoricalStops<float>;
+template class CategoricalStops<Color>;
+template class CategoricalStops<std::array<float, 2>>;
+
+} // namespace style
+} // namespace mbgl