1 files changed, 43 insertions, 0 deletions
diff --git a/src/mbgl/style/function/identity_stops.cpp b/src/mbgl/style/function/identity_stops.cpp
new file mode 100644
index 0000000000..e210b4d773
--- /dev/null
+++ b/src/mbgl/style/function/identity_stops.cpp
@@ -0,0 +1,43 @@
+#include <mbgl/style/function/identity_stops.hpp>
+#include <mbgl/util/color.hpp>
+
+#include <array>
+
+namespace mbgl {
+namespace style {
+
+template <>
+float IdentityStops<float>::evaluate(const Value& value) const {
+    return numericValue<float>(value)
+        .value_or(0.0f);
+}
+
+template <>
+Color IdentityStops<Color>::evaluate(const Value& value) const {
+    if (!value.is<std::string>()) {
+        return Color::black();
+    }
+
+    return Color::parse(value.get<std::string>())
+        .value_or(Color::black());
+}
+
+template <>
+std::array<float, 2> IdentityStops<std::array<float, 2>>::evaluate(const Value& value) const {
+    if (!value.is<std::vector<Value>>()) {
+        return {{ 0, 0 }};
+    }
+
+    const std::vector<Value>& vector = value.get<std::vector<Value>>();
+    if (vector.size() != 2 || !numericValue<float>(vector[0]) || !numericValue<float>(vector[1])) {
+        return {{ 0, 0 }};
+    }
+
+    return {{
+        *numericValue<float>(vector[0]),
+        *numericValue<float>(vector[1])
+    }};
+}
+
+} // namespace style
+} // namespace mbgl