1 files changed, 68 insertions, 0 deletions
diff --git a/include/systems/lua.hpp b/include/systems/lua.hpp
new file mode 100644
index 0000000..0d8528b
--- /dev/null
+++ b/include/systems/lua.hpp
@@ -0,0 +1,68 @@
+#ifndef SYSTEMS_LUA_HPP_
+#define SYSTEMS_LUA_HPP_
+
+#include <string>
+#include <lua.hpp>
+
+#include <vector2.hpp>
+
+class LuaScript {
+private:
+	lua_State* state;
+	std::string script;
+
+public:
+	LuaScript(const std::string& sc = "")
+		: script(sc) {
+		state = luaL_newstate();
+		luaL_openlibs(state);
+		luaL_loadstring(state, script.c_str());
+		lua_pcall(state, 0, 0, 0);
+	}
+
+	inline auto operator()(void) {
+		lua_getglobal(state, "update");
+		lua_pcall(state, 0, LUA_MULTRET, 0);
+		if (lua_gettop(state) != 2)
+			return vec2();
+		vec2 ret (lua_tonumber(state, 1), lua_tonumber(state, 2));
+		lua_pop(state, 2);
+		return ret;
+	}
+};
+
+class LuaSystem {
+private:
+	class LuaInterpreter {
+	private:
+		lua_State* state;
+
+	public:
+		LuaInterpreter(void) {
+			state = luaL_newstate();
+			luaL_openlibs(state);
+		}
+
+		void registerFunc(const std::string& name, lua_CFunction func) {
+			lua_pushcclosure(state, func, 0);
+			lua_setglobal(state, name.c_str());
+		}
+
+		void loadFile(const std::string& name) {
+			luaL_dofile(state, name.c_str());
+			lua_pcall(state, 0, 0, 0); // 'prime' the file
+		}
+
+		void runFunc(const std::string& name) {
+			lua_getglobal(state, name.c_str());
+			lua_pcall(state, 0, 0, 0);
+		}
+	};
+
+public:
+	inline static LuaScript makeScript(const std::string& s) {
+		return LuaScript(s);
+	}
+};
+
+#endif // SYSTEMS_LUA_HPP_