first commit

src/main/java/org/openautonomousconnection/luascript/events/JavaToLua.java

@@ -0,0 +1,47 @@
+package org.openautonomousconnection.luascript.events;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Coerces common Java values into Lua values.
+ */
+public final class JavaToLua {
+
+    private JavaToLua() { }
+
+    public static LuaValue coerce(Object v) {
+        if (v == null) return LuaValue.NIL;
+        if (v instanceof LuaValue lv) return lv;
+        if (v instanceof String s) return LuaValue.valueOf(s);
+        if (v instanceof Boolean b) return LuaValue.valueOf(b);
+        if (v instanceof Integer i) return LuaValue.valueOf(i);
+        if (v instanceof Long l) return LuaValue.valueOf(l);
+        if (v instanceof Float f) return LuaValue.valueOf(f);
+        if (v instanceof Double d) return LuaValue.valueOf(d);
+
+        if (v instanceof Map<?, ?> m) {
+            LuaTable t = new LuaTable();
+            for (Map.Entry<?, ?> e : m.entrySet()) {
+                Object k = e.getKey();
+                if (k == null) continue;
+                t.set(String.valueOf(k), coerce(e.getValue()));
+            }
+            return t;
+        }
+
+        if (v instanceof List<?> list) {
+            LuaTable t = new LuaTable();
+            int i = 1;
+            for (Object o : list) {
+                t.set(i++, coerce(o));
+            }
+            return t;
+        }
+
+        return LuaValue.valueOf(String.valueOf(v));
+    }
+}