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#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_
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