use std::any::TypeId;
use std::cell::{Ref, RefCell, RefMut};
use std::marker::PhantomData;
use std::sync::{Arc, Mutex, RwLock};
use crate::error::{Error, Result};
use crate::ffi;
use crate::lua::Lua;
use crate::types::{Callback, MaybeSend};
use crate::userdata::{
AnyUserData, MetaMethod, UserData, UserDataCell, UserDataFields, UserDataMethods,
};
use crate::util::{check_stack, get_userdata, StackGuard};
use crate::value::{FromLua, FromLuaMulti, ToLua, ToLuaMulti, Value};
#[cfg(not(feature = "send"))]
use std::rc::Rc;
#[cfg(feature = "async")]
use {
crate::types::AsyncCallback,
futures_core::future::Future,
futures_util::future::{self, TryFutureExt},
};
pub(crate) struct StaticUserDataMethods<'lua, T: 'static + UserData> {
pub(crate) methods: Vec<(Vec<u8>, Callback<'lua, 'static>)>,
#[cfg(feature = "async")]
pub(crate) async_methods: Vec<(Vec<u8>, AsyncCallback<'lua, 'static>)>,
pub(crate) meta_methods: Vec<(MetaMethod, Callback<'lua, 'static>)>,
#[cfg(feature = "async")]
pub(crate) async_meta_methods: Vec<(MetaMethod, AsyncCallback<'lua, 'static>)>,
_type: PhantomData<T>,
}
impl<'lua, T: 'static + UserData> Default for StaticUserDataMethods<'lua, T> {
fn default() -> StaticUserDataMethods<'lua, T> {
StaticUserDataMethods {
methods: Vec::new(),
#[cfg(feature = "async")]
async_methods: Vec::new(),
meta_methods: Vec::new(),
#[cfg(feature = "async")]
async_meta_methods: Vec::new(),
_type: PhantomData,
}
}
}
impl<'lua, T: 'static + UserData> UserDataMethods<'lua, T> for StaticUserDataMethods<'lua, T> {
fn add_method<S, A, R, M>(&mut self, name: &S, method: M)
where
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, &T, A) -> Result<R>,
{
self.methods
.push((name.as_ref().to_vec(), Self::box_method(method)));
}
fn add_method_mut<S, A, R, M>(&mut self, name: &S, method: M)
where
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
{
self.methods
.push((name.as_ref().to_vec(), Self::box_method_mut(method)));
}
#[cfg(feature = "async")]
fn add_async_method<S, A, R, M, MR>(&mut self, name: &S, method: M)
where
T: Clone,
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, T, A) -> MR,
MR: 'lua + Future<Output = Result<R>>,
{
self.async_methods
.push((name.as_ref().to_vec(), Self::box_async_method(method)));
}
fn add_function<S, A, R, F>(&mut self, name: &S, function: F)
where
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> Result<R>,
{
self.methods
.push((name.as_ref().to_vec(), Self::box_function(function)));
}
fn add_function_mut<S, A, R, F>(&mut self, name: &S, function: F)
where
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + FnMut(&'lua Lua, A) -> Result<R>,
{
self.methods
.push((name.as_ref().to_vec(), Self::box_function_mut(function)));
}
#[cfg(feature = "async")]
fn add_async_function<S, A, R, F, FR>(&mut self, name: &S, function: F)
where
S: AsRef<[u8]> + ?Sized,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> FR,
FR: 'lua + Future<Output = Result<R>>,
{
self.async_methods
.push((name.as_ref().to_vec(), Self::box_async_function(function)));
}
fn add_meta_method<S, A, R, M>(&mut self, meta: S, method: M)
where
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, &T, A) -> Result<R>,
{
self.meta_methods
.push((meta.into(), Self::box_method(method)));
}
fn add_meta_method_mut<S, A, R, M>(&mut self, meta: S, method: M)
where
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
{
self.meta_methods
.push((meta.into(), Self::box_method_mut(method)));
}
#[cfg(all(feature = "async", not(any(feature = "lua51", feature = "luau"))))]
fn add_async_meta_method<S, A, R, M, MR>(&mut self, meta: S, method: M)
where
T: Clone,
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, T, A) -> MR,
MR: 'lua + Future<Output = Result<R>>,
{
self.async_meta_methods
.push((meta.into(), Self::box_async_method(method)));
}
fn add_meta_function<S, A, R, F>(&mut self, meta: S, function: F)
where
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> Result<R>,
{
self.meta_methods
.push((meta.into(), Self::box_function(function)));
}
fn add_meta_function_mut<S, A, R, F>(&mut self, meta: S, function: F)
where
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + FnMut(&'lua Lua, A) -> Result<R>,
{
self.meta_methods
.push((meta.into(), Self::box_function_mut(function)));
}
#[cfg(all(feature = "async", not(any(feature = "lua51", feature = "luau"))))]
fn add_async_meta_function<S, A, R, F, FR>(&mut self, meta: S, function: F)
where
S: Into<MetaMethod>,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> FR,
FR: 'lua + Future<Output = Result<R>>,
{
self.async_meta_methods
.push((meta.into(), Self::box_async_function(function)));
}
fn add_callback(&mut self, name: Vec<u8>, callback: Callback<'lua, 'static>) {
self.methods.push((name, callback));
}
#[cfg(feature = "async")]
fn add_async_callback(&mut self, name: Vec<u8>, callback: AsyncCallback<'lua, 'static>) {
self.async_methods.push((name, callback));
}
fn add_meta_callback(&mut self, meta: MetaMethod, callback: Callback<'lua, 'static>) {
self.meta_methods.push((meta, callback));
}
#[cfg(feature = "async")]
fn add_async_meta_callback(
&mut self,
meta: MetaMethod,
callback: AsyncCallback<'lua, 'static>,
) {
self.async_meta_methods.push((meta, callback))
}
}
impl<'lua, T: 'static + UserData> StaticUserDataMethods<'lua, T> {
fn box_method<A, R, M>(method: M) -> Callback<'lua, 'static>
where
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, &T, A) -> Result<R>,
{
Box::new(move |lua, mut args| {
if let Some(front) = args.pop_front() {
let userdata = AnyUserData::from_lua(front, lua)?;
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 2)?;
let type_id = lua.push_userdata_ref(&userdata.0)?;
match type_id {
Some(id) if id == TypeId::of::<T>() => {
let ud = get_userdata_ref::<T>(lua.state)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(not(feature = "send"))]
Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
let ud = get_userdata_ref::<Rc<RefCell<T>>>(lua.state)?;
let ud = ud.try_borrow().map_err(|_| Error::UserDataBorrowError)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
let ud = get_userdata_ref::<Arc<Mutex<T>>>(lua.state)?;
let ud = ud.try_lock().map_err(|_| Error::UserDataBorrowError)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
let ud = get_userdata_ref::<Arc<parking_lot::Mutex<T>>>(lua.state)?;
let ud = ud.try_lock().ok_or(Error::UserDataBorrowError)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
let ud = get_userdata_ref::<Arc<RwLock<T>>>(lua.state)?;
let ud = ud.try_read().map_err(|_| Error::UserDataBorrowError)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
let ud = get_userdata_ref::<Arc<parking_lot::RwLock<T>>>(lua.state)?;
let ud = ud.try_read().ok_or(Error::UserDataBorrowError)?;
method(lua, &ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
_ => Err(Error::UserDataTypeMismatch),
}
}
} else {
Err(Error::FromLuaConversionError {
from: "missing argument",
to: "userdata",
message: None,
})
}
})
}
fn box_method_mut<A, R, M>(method: M) -> Callback<'lua, 'static>
where
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + FnMut(&'lua Lua, &mut T, A) -> Result<R>,
{
let method = RefCell::new(method);
Box::new(move |lua, mut args| {
if let Some(front) = args.pop_front() {
let userdata = AnyUserData::from_lua(front, lua)?;
let mut method = method
.try_borrow_mut()
.map_err(|_| Error::RecursiveMutCallback)?;
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 2)?;
let type_id = lua.push_userdata_ref(&userdata.0)?;
match type_id {
Some(id) if id == TypeId::of::<T>() => {
let mut ud = get_userdata_mut::<T>(lua.state)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(not(feature = "send"))]
Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
let ud = get_userdata_mut::<Rc<RefCell<T>>>(lua.state)?;
let mut ud = ud
.try_borrow_mut()
.map_err(|_| Error::UserDataBorrowMutError)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
let ud = get_userdata_mut::<Arc<Mutex<T>>>(lua.state)?;
let mut ud =
ud.try_lock().map_err(|_| Error::UserDataBorrowMutError)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
let ud = get_userdata_mut::<Arc<parking_lot::Mutex<T>>>(lua.state)?;
let mut ud = ud.try_lock().ok_or(Error::UserDataBorrowMutError)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
let ud = get_userdata_mut::<Arc<RwLock<T>>>(lua.state)?;
let mut ud =
ud.try_write().map_err(|_| Error::UserDataBorrowMutError)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
let ud = get_userdata_mut::<Arc<parking_lot::RwLock<T>>>(lua.state)?;
let mut ud = ud.try_write().ok_or(Error::UserDataBorrowMutError)?;
method(lua, &mut ud, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
}
_ => Err(Error::UserDataTypeMismatch),
}
}
} else {
Err(Error::FromLuaConversionError {
from: "missing argument",
to: "userdata",
message: None,
})
}
})
}
#[cfg(feature = "async")]
fn box_async_method<A, R, M, MR>(method: M) -> AsyncCallback<'lua, 'static>
where
T: Clone,
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, T, A) -> MR,
MR: 'lua + Future<Output = Result<R>>,
{
Box::new(move |lua, mut args| {
let fut_res = || {
if let Some(front) = args.pop_front() {
let userdata = AnyUserData::from_lua(front, lua)?;
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 2)?;
let type_id = lua.push_userdata_ref(&userdata.0)?;
match type_id {
Some(id) if id == TypeId::of::<T>() => {
let ud = get_userdata_ref::<T>(lua.state)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
#[cfg(not(feature = "send"))]
Some(id) if id == TypeId::of::<Rc<RefCell<T>>>() => {
let ud = get_userdata_ref::<Rc<RefCell<T>>>(lua.state)?;
let ud = ud.try_borrow().map_err(|_| Error::UserDataBorrowError)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
Some(id) if id == TypeId::of::<Arc<Mutex<T>>>() => {
let ud = get_userdata_ref::<Arc<Mutex<T>>>(lua.state)?;
let ud = ud.try_lock().map_err(|_| Error::UserDataBorrowError)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::Mutex<T>>>() => {
let ud = get_userdata_ref::<Arc<parking_lot::Mutex<T>>>(lua.state)?;
let ud = ud.try_lock().ok_or(Error::UserDataBorrowError)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
Some(id) if id == TypeId::of::<Arc<RwLock<T>>>() => {
let ud = get_userdata_ref::<Arc<RwLock<T>>>(lua.state)?;
let ud = ud.try_read().map_err(|_| Error::UserDataBorrowError)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
#[cfg(feature = "parking_lot")]
Some(id) if id == TypeId::of::<Arc<parking_lot::RwLock<T>>>() => {
let ud =
get_userdata_ref::<Arc<parking_lot::RwLock<T>>>(lua.state)?;
let ud = ud.try_read().ok_or(Error::UserDataBorrowError)?;
Ok(method(lua, ud.clone(), A::from_lua_multi(args, lua)?))
}
_ => Err(Error::UserDataTypeMismatch),
}
}
} else {
Err(Error::FromLuaConversionError {
from: "missing argument",
to: "userdata",
message: None,
})
}
};
match fut_res() {
Ok(fut) => Box::pin(fut.and_then(move |ret| future::ready(ret.to_lua_multi(lua)))),
Err(e) => Box::pin(future::err(e)),
}
})
}
fn box_function<A, R, F>(function: F) -> Callback<'lua, 'static>
where
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> Result<R>,
{
Box::new(move |lua, args| function(lua, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua))
}
fn box_function_mut<A, R, F>(function: F) -> Callback<'lua, 'static>
where
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + FnMut(&'lua Lua, A) -> Result<R>,
{
let function = RefCell::new(function);
Box::new(move |lua, args| {
let function = &mut *function
.try_borrow_mut()
.map_err(|_| Error::RecursiveMutCallback)?;
function(lua, A::from_lua_multi(args, lua)?)?.to_lua_multi(lua)
})
}
#[cfg(feature = "async")]
fn box_async_function<A, R, F, FR>(function: F) -> AsyncCallback<'lua, 'static>
where
A: FromLuaMulti<'lua>,
R: ToLuaMulti<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, A) -> FR,
FR: 'lua + Future<Output = Result<R>>,
{
Box::new(move |lua, args| {
let args = match A::from_lua_multi(args, lua) {
Ok(args) => args,
Err(e) => return Box::pin(future::err(e)),
};
Box::pin(function(lua, args).and_then(move |ret| future::ready(ret.to_lua_multi(lua))))
})
}
}
pub(crate) struct StaticUserDataFields<'lua, T: 'static + UserData> {
pub(crate) field_getters: Vec<(Vec<u8>, Callback<'lua, 'static>)>,
pub(crate) field_setters: Vec<(Vec<u8>, Callback<'lua, 'static>)>,
#[allow(clippy::type_complexity)]
pub(crate) meta_fields: Vec<(
MetaMethod,
Box<dyn Fn(&'lua Lua) -> Result<Value<'lua>> + 'static>,
)>,
_type: PhantomData<T>,
}
impl<'lua, T: 'static + UserData> Default for StaticUserDataFields<'lua, T> {
fn default() -> StaticUserDataFields<'lua, T> {
StaticUserDataFields {
field_getters: Vec::new(),
field_setters: Vec::new(),
meta_fields: Vec::new(),
_type: PhantomData,
}
}
}
impl<'lua, T: 'static + UserData> UserDataFields<'lua, T> for StaticUserDataFields<'lua, T> {
fn add_field_method_get<S, R, M>(&mut self, name: &S, method: M)
where
S: AsRef<[u8]> + ?Sized,
R: ToLua<'lua>,
M: 'static + MaybeSend + Fn(&'lua Lua, &T) -> Result<R>,
{
self.field_getters.push((
name.as_ref().to_vec(),
StaticUserDataMethods::box_method(move |lua, data, ()| method(lua, data)),
));
}
fn add_field_method_set<S, A, M>(&mut self, name: &S, method: M)
where
S: AsRef<[u8]> + ?Sized,
A: FromLua<'lua>,
M: 'static + MaybeSend + FnMut(&'lua Lua, &mut T, A) -> Result<()>,
{
self.field_setters.push((
name.as_ref().to_vec(),
StaticUserDataMethods::box_method_mut(method),
));
}
fn add_field_function_get<S, R, F>(&mut self, name: &S, function: F)
where
S: AsRef<[u8]> + ?Sized,
R: ToLua<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua, AnyUserData<'lua>) -> Result<R>,
{
self.field_getters.push((
name.as_ref().to_vec(),
StaticUserDataMethods::<T>::box_function(function),
));
}
fn add_field_function_set<S, A, F>(&mut self, name: &S, mut function: F)
where
S: AsRef<[u8]> + ?Sized,
A: FromLua<'lua>,
F: 'static + MaybeSend + FnMut(&'lua Lua, AnyUserData<'lua>, A) -> Result<()>,
{
self.field_setters.push((
name.as_ref().to_vec(),
StaticUserDataMethods::<T>::box_function_mut(move |lua, (data, val)| {
function(lua, data, val)
}),
));
}
fn add_meta_field_with<S, R, F>(&mut self, meta: S, f: F)
where
S: Into<MetaMethod>,
R: ToLua<'lua>,
F: 'static + MaybeSend + Fn(&'lua Lua) -> Result<R>,
{
let meta = meta.into();
self.meta_fields.push((
meta.clone(),
Box::new(move |lua| {
let value = f(lua)?.to_lua(lua)?;
if meta == MetaMethod::Index || meta == MetaMethod::NewIndex {
match value {
Value::Nil | Value::Table(_) | Value::Function(_) => {}
_ => {
return Err(Error::MetaMethodTypeError {
method: meta.to_string(),
type_name: value.type_name(),
message: Some("expected nil, table or function".to_string()),
})
}
}
}
Ok(value)
}),
));
}
fn add_field_getter(&mut self, name: Vec<u8>, callback: Callback<'lua, 'static>) {
self.field_getters.push((name, callback));
}
fn add_field_setter(&mut self, name: Vec<u8>, callback: Callback<'lua, 'static>) {
self.field_setters.push((name, callback));
}
}
#[inline]
unsafe fn get_userdata_ref<'a, T>(state: *mut ffi::lua_State) -> Result<Ref<'a, T>> {
(*get_userdata::<UserDataCell<T>>(state, -1)).try_borrow()
}
#[inline]
unsafe fn get_userdata_mut<'a, T>(state: *mut ffi::lua_State) -> Result<RefMut<'a, T>> {
(*get_userdata::<UserDataCell<T>>(state, -1)).try_borrow_mut()
}
macro_rules! lua_userdata_impl {
($type:ty) => {
impl<T: 'static + UserData> UserData for $type {
fn add_fields<'lua, F: UserDataFields<'lua, Self>>(fields: &mut F) {
let mut orig_fields = StaticUserDataFields::default();
T::add_fields(&mut orig_fields);
for (name, callback) in orig_fields.field_getters {
fields.add_field_getter(name, callback);
}
for (name, callback) in orig_fields.field_setters {
fields.add_field_setter(name, callback);
}
}
fn add_methods<'lua, M: UserDataMethods<'lua, Self>>(methods: &mut M) {
let mut orig_methods = StaticUserDataMethods::default();
T::add_methods(&mut orig_methods);
for (name, callback) in orig_methods.methods {
methods.add_callback(name, callback);
}
#[cfg(feature = "async")]
for (name, callback) in orig_methods.async_methods {
methods.add_async_callback(name, callback);
}
for (meta, callback) in orig_methods.meta_methods {
methods.add_meta_callback(meta, callback);
}
#[cfg(feature = "async")]
for (meta, callback) in orig_methods.async_meta_methods {
methods.add_async_meta_callback(meta, callback);
}
}
}
};
}
#[cfg(not(feature = "send"))]
lua_userdata_impl!(Rc<RefCell<T>>);
lua_userdata_impl!(Arc<Mutex<T>>);
lua_userdata_impl!(Arc<RwLock<T>>);
#[cfg(feature = "parking_lot")]
lua_userdata_impl!(Arc<parking_lot::Mutex<T>>);
#[cfg(feature = "parking_lot")]
lua_userdata_impl!(Arc<parking_lot::RwLock<T>>);