1 files changed, 42 insertions, 0 deletions
diff --git a/serialize/magnum-vector2i.hpp b/serialize/magnum-vector2i.hpp
new file mode 100644
index 00000000..eb445e21
--- /dev/null
+++ b/serialize/magnum-vector2i.hpp
@@ -0,0 +1,42 @@
+#include <cstdio>
+#include <string>
+#include <limits>
+#include <exception>
+#include <Magnum/Magnum.h>
+#include <Magnum/Math/Vector2.h>
+#include <nlohmann/json.hpp>
+
+namespace nlohmann {
+
+template<typename t>
+requires std::is_integral_v<t>
+struct adl_serializer<Magnum::Math::Vector2<t>> final {
+    static void to_json(json& j, const Magnum::Math::Vector2<t>& val)
+    {
+        char buf[64];
+        using type = std::conditional_t<std::is_signed_v<t>, std::intmax_t, std::uintmax_t>;
+        constexpr auto format_string = std::is_signed_v<t> ? "%jd x %jd" : "%ju x %ju";
+        snprintf(buf, sizeof(buf), format_string, (type)val[0], (type)val[1]);
+        j = buf;
+    }
+    static void from_json(const json& j, Magnum::Math::Vector2<t>& val)
+    {
+        std::string str = j;
+        using type = std::conditional_t<std::is_signed_v<t>, std::intmax_t, std::uintmax_t>;
+        constexpr auto format_string = std::is_signed_v<t> ? "%jd x %jd%n" : "%ju x %ju%n";
+        type x = 0, y = 0;
+        int n = 0;
+        int ret = std::sscanf(str.c_str(), format_string, &x, &y, &n);
+        if (ret != 2 || (std::size_t)n != str.size() || x != (type)x || y != (type)y)
+        {
+            std::string msg; msg.reserve(128);
+            msg += "failed to parse string '";
+            msg += str;
+            msg += "' as Magnum::Vector2i";
+            throw std::invalid_argument(msg);
+        }
+        val = { (t)x, (t)y };
+    }
+};
+
+} // namespace nlohmann