Update luaffi

crates/luaffi/src/option.rs

@@ -1,78 +0,0 @@
-use crate::{Cdef, CdefBuilder, FfiReturnConvention, FromFfi, ToFfi, Type, TypeBuilder, display};
-use std::{ffi::c_int, fmt::Display, ptr};
-
-#[repr(C)]
-#[allow(non_camel_case_types)]
-pub enum lua_option<T> {
-    None,    // __tag = 0
-    Some(T), // __tag = 1
-}
-
-unsafe impl<T: Type> Type for lua_option<T> {
-    fn name() -> impl Display {
-        display!("option__{}", T::name())
-    }
-
-    fn cdecl(name: impl Display) -> impl Display {
-        display!("struct option__{} {name}", T::name())
-    }
-
-    fn build(b: &mut TypeBuilder) {
-        b.include::<T>().cdef::<Self>();
-    }
-}
-
-unsafe impl<T: Type> Cdef for lua_option<T> {
-    fn build(b: &mut CdefBuilder) {
-        b.field::<c_int>("__tag").field::<T>("__value");
-    }
-}
-
-unsafe impl<T: FromFfi> FromFfi for Option<T> {
-    type From = lua_option<T::From>;
-    type FromArg = *mut Self::From; // pass by-ref
-
-    fn require_keepalive() -> bool {
-        T::require_keepalive()
-    }
-
-    fn prelude(arg: &str) -> impl Display {
-        let ct = Self::From::name();
-        display!(
-            "if {arg} == nil then {arg} = __new(__ct.{ct}); else {}{arg} = __new(__ct.{ct}, 1, {arg}); end; ",
-            T::prelude(arg)
-        )
-    }
-
-    fn convert(from: Self::From) -> Self {
-        match from {
-            lua_option::Some(value) => Some(T::convert(value)),
-            lua_option::None => None,
-        }
-    }
-
-    fn convert_arg(from: Self::FromArg) -> Self {
-        debug_assert!(!from.is_null());
-        Self::convert(unsafe { ptr::replace(from, lua_option::None) })
-    }
-}
-
-unsafe impl<T: ToFfi> ToFfi for Option<T> {
-    type To = lua_option<T::To>;
-
-    fn convert(self) -> Self::To {
-        match self {
-            Some(value) => lua_option::Some(value.convert()),
-            None => lua_option::None,
-        }
-    }
-
-    fn postlude(ret: &str, _conv: FfiReturnConvention) -> impl Display {
-        // if we don't have a value, return nil. otherwise copy out the inner value immediately,
-        // forget the option cdata, then call postlude on the inner value.
-        display!(
-            "if {ret}.__tag == 0 then {ret} = nil; else {ret} = {ret}.__value; {}end; ",
-            T::postlude(ret, FfiReturnConvention::ByValue)
-        )
-    }
-}