Refactor `Function::bind` implementation.
Make it possible to bind async function arguments. Fixes #161
This commit is contained in:
parent
6b2ceb60c4
commit
2a8c5c7f82
|
@ -178,24 +178,17 @@ impl<'lua> Function<'lua> {
|
|||
/// # }
|
||||
/// ```
|
||||
pub fn bind<A: ToLuaMulti<'lua>>(&self, args: A) -> Result<Function<'lua>> {
|
||||
unsafe extern "C" fn bind_call_impl(state: *mut ffi::lua_State) -> c_int {
|
||||
unsafe extern "C" fn args_wrapper_impl(state: *mut ffi::lua_State) -> c_int {
|
||||
let nargs = ffi::lua_gettop(state);
|
||||
let nbinds = ffi::lua_tointeger(state, ffi::lua_upvalueindex(2)) as c_int;
|
||||
ffi::luaL_checkstack(state, nbinds + 2, ptr::null());
|
||||
|
||||
ffi::lua_settop(state, nargs + nbinds + 1);
|
||||
ffi::lua_rotate(state, -(nargs + nbinds + 1), nbinds + 1);
|
||||
|
||||
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(1));
|
||||
ffi::lua_replace(state, 1);
|
||||
let nbinds = ffi::lua_tointeger(state, ffi::lua_upvalueindex(1)) as c_int;
|
||||
ffi::luaL_checkstack(state, nbinds, ptr::null());
|
||||
|
||||
for i in 0..nbinds {
|
||||
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(i + 3));
|
||||
ffi::lua_replace(state, i + 2);
|
||||
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(i + 2));
|
||||
}
|
||||
ffi::lua_rotate(state, 1, nbinds);
|
||||
|
||||
ffi::lua_call(state, nargs + nbinds, ffi::LUA_MULTRET);
|
||||
ffi::lua_gettop(state)
|
||||
nargs + nbinds
|
||||
}
|
||||
|
||||
let lua = self.0.lua;
|
||||
|
@ -203,25 +196,35 @@ impl<'lua> Function<'lua> {
|
|||
let args = args.to_lua_multi(lua)?;
|
||||
let nargs = args.len() as c_int;
|
||||
|
||||
if nargs + 2 > ffi::LUA_MAX_UPVALUES {
|
||||
if nargs + 1 > ffi::LUA_MAX_UPVALUES {
|
||||
return Err(Error::BindError);
|
||||
}
|
||||
|
||||
unsafe {
|
||||
let args_wrapper = unsafe {
|
||||
let _sg = StackGuard::new(lua.state);
|
||||
check_stack(lua.state, nargs + 5)?;
|
||||
check_stack(lua.state, nargs + 3)?;
|
||||
|
||||
lua.push_ref(&self.0);
|
||||
ffi::lua_pushinteger(lua.state, nargs as ffi::lua_Integer);
|
||||
for arg in args {
|
||||
lua.push_value(arg)?;
|
||||
}
|
||||
protect_lua!(lua.state, nargs + 2, 1, fn(state) {
|
||||
ffi::lua_pushcclosure(state, bind_call_impl, ffi::lua_gettop(state));
|
||||
protect_lua!(lua.state, nargs + 1, 1, fn(state) {
|
||||
ffi::lua_pushcclosure(state, args_wrapper_impl, ffi::lua_gettop(state));
|
||||
})?;
|
||||
|
||||
Ok(Function(lua.pop_ref()))
|
||||
}
|
||||
Function(lua.pop_ref())
|
||||
};
|
||||
|
||||
lua.load(
|
||||
r#"
|
||||
local func, args_wrapper = ...
|
||||
return function(...)
|
||||
return func(args_wrapper(...))
|
||||
end
|
||||
"#,
|
||||
)
|
||||
.set_name("_mlua_bind")?
|
||||
.call((self.clone(), args_wrapper))
|
||||
}
|
||||
|
||||
/// Returns information about the function.
|
||||
|
|
|
@ -75,7 +75,10 @@ async fn test_async_call() -> Result<()> {
|
|||
async fn test_async_bind_call() -> Result<()> {
|
||||
let lua = Lua::new();
|
||||
|
||||
let sum = lua.create_async_function(|_lua, (a, b): (i64, i64)| async move { Ok(a + b) })?;
|
||||
let sum = lua.create_async_function(|_lua, (a, b): (i64, i64)| async move {
|
||||
tokio::task::yield_now().await;
|
||||
Ok(a + b)
|
||||
})?;
|
||||
|
||||
let plus_10 = sum.bind(10)?;
|
||||
lua.globals().set("plus_10", plus_10)?;
|
||||
|
|
Loading…
Reference in New Issue