utils.h

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#ifndef NNGN_LUA_UTILS_H
#define NNGN_LUA_UTILS_H
 
#include <lua.hpp>
 
#include "os/platform.h"
#include "utils/log.h"
#include "utils/scoped.h"
#include "utils/utils.h"
 
namespace nngn::lua {
 
inline auto defer_settop(lua_State *L, int i = -1) {
    return make_scoped(
        std::bind_front(lua_settop, L, i == -1 ? lua_gettop(L) : i));
}
 
class defer_pop {
public:
    NNGN_MOVE_ONLY(defer_pop)
    explicit defer_pop(lua_State *L_, int n_ = 1) : L{L_}, n{n_} {}
    ~defer_pop(void) { if(this->n) lua_pop(L, n); }
    void set_n(int n_) { this->n = n_; }
private:
    lua_State *L;
    int n;
};
 
inline auto stack_mark(lua_State *L, int extra = 0) {
    if constexpr(!Platform::debug)
        return empty{};
    else
        return make_scoped([](auto L_, int t0) {
            if(const int t1 = lua_gettop(L_); t0 != t1)
                Log::l()
                    << "unexpected stack top: "
                    << t1 << " != " << t0 << '\n';
        }, L, lua_gettop(L) + extra);
}
 
}
 
#endif