a

1 files changed, 41 insertions, 0 deletions

diff --git a/serialize/magnum-vector.hpp b/serialize/magnum-vector.hpp
new file mode 100644
index 00000000..39924a9b
--- /dev/null
+++ b/serialize/magnum-vector.hpp
@@ -0,0 +1,41 @@
+#include <cstdio>
+#include <string>
+#include <exception>
+#include <Magnum/Magnum.h>
+#include <Magnum/Math/Vector2.h>
+#include <nlohmann/json.hpp>
+
+namespace nlohmann {
+
+template<typename t>
+struct adl_serializer<Magnum::Math::Vector2<t>> final {
+    static void to_json(json& j, const Magnum::Math::Vector2<t>& x);
+    static void from_json(const json& j, Magnum::Math::Vector2<t>& x);
+};
+
+template<typename t>
+void adl_serializer<Magnum::Math::Vector2<t>>::to_json(json& j, const Magnum::Math::Vector2<t>& val)
+{
+    char buf[64];
+    snprintf(buf, sizeof(buf), "%d x %d", val[0], val[1]);
+    j = buf;
+}
+
+template<typename t>
+void adl_serializer<Magnum::Math::Vector2<t>>::from_json(const json& j, Magnum::Math::Vector2<t>& val)
+{
+    std::string str = j;
+    int x = 0, y = 0, n = 0;
+    int ret = std::sscanf(str.c_str(), "%d x %d%n", &x, &y, &n);
+    if (ret != 2 || (std::size_t)n != str.size())
+    {
+        std::string msg; msg.reserve(64 + str.size());
+        msg += "failed to parse string '";
+        msg += str;
+        msg += "' as Magnum::Vector2i";
+        throw std::invalid_argument(msg);
+    }
+    val = { x, y };
+}
+
+} // namespace nlohmann