{-# OPTIONS_GHC -Wno-warnings-deprecations #-}
{-|
Module      : HsLua.Core.Unsafe
Copyright   : © 2019-2024 Albert Krewinkel
License     : MIT
Maintainer  : Albert Krewinkel <tarleb@hslua.org>

Unsafe Lua functions.

This module exports functions which conflict with those in 'HsLua.Core'.
It is intended to be imported qualified.
-}
module HsLua.Core.Unsafe
  ( next
  )
where

import Control.Monad ((<$!>))
import HsLua.Core.Types (LuaE, StackIndex, liftLua, fromLuaBool)
import Lua.Primary (lua_next)

-- | Wrapper for 'lua_next'.
--
-- __WARNING__: @lua_next@ is unsafe in Haskell: This function will
-- cause an unrecoverable crash an error if the given key is neither
-- @nil@ nor present in the table. Consider using the safe
-- @'HsLua.Core.next'@ function in HsLua.Core instead.
next :: StackIndex -> LuaE e Bool
next :: forall e. StackIndex -> LuaE e Bool
next StackIndex
idx = (State -> IO Bool) -> LuaE e Bool
forall a e. (State -> IO a) -> LuaE e a
liftLua ((State -> IO Bool) -> LuaE e Bool)
-> (State -> IO Bool) -> LuaE e Bool
forall a b. (a -> b) -> a -> b
$ \State
l -> LuaBool -> Bool
fromLuaBool (LuaBool -> Bool) -> IO LuaBool -> IO Bool
forall (m :: * -> *) a b. Monad m => (a -> b) -> m a -> m b
<$!> State -> StackIndex -> IO LuaBool
lua_next State
l StackIndex
idx
{-# INLINABLE next #-}