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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| use std::any::{Any, TypeId}; | ||
| use std::cell::{Cell, Ref, RefCell, RefMut, UnsafeCell}; | ||
| use std::fmt; | ||
| use std::ops::{Deref, DerefMut}; | ||
| use std::result::Result as StdResult; | ||
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| use rustc_hash::FxHashMap; | ||
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| use crate::state::LuaGuard; | ||
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| use super::MaybeSend; | ||
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| #[cfg(not(feature = "send"))] | ||
| type Container = UnsafeCell<FxHashMap<TypeId, RefCell<Box<dyn Any>>>>; | ||
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| #[cfg(feature = "send")] | ||
| type Container = UnsafeCell<FxHashMap<TypeId, RefCell<Box<dyn Any + Send>>>>; | ||
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| /// A container for arbitrary data associated with the Lua state. | ||
| #[derive(Debug, Default)] | ||
| pub struct AppData { | ||
| container: Container, | ||
| borrow: Cell<usize>, | ||
| } | ||
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| impl AppData { | ||
| #[track_caller] | ||
| pub(crate) fn insert<T: MaybeSend + 'static>(&self, data: T) -> Option<T> { | ||
| match self.try_insert(data) { | ||
| Ok(data) => data, | ||
| Err(_) => panic!("cannot mutably borrow app data container"), | ||
| } | ||
| } | ||
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| pub(crate) fn try_insert<T: MaybeSend + 'static>(&self, data: T) -> StdResult<Option<T>, T> { | ||
| if self.borrow.get() != 0 { | ||
| return Err(data); | ||
| } | ||
| // SAFETY: we checked that there are no other references to the container | ||
| Ok(unsafe { &mut *self.container.get() } | ||
| .insert(TypeId::of::<T>(), RefCell::new(Box::new(data))) | ||
| .and_then(|data| data.into_inner().downcast::<T>().ok().map(|data| *data))) | ||
| } | ||
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| #[track_caller] | ||
| pub(crate) fn borrow<T: 'static>(&self, guard: Option<LuaGuard>) -> Option<AppDataRef<T>> { | ||
| let data = unsafe { &*self.container.get() } | ||
| .get(&TypeId::of::<T>())? | ||
| .borrow(); | ||
| self.borrow.set(self.borrow.get() + 1); | ||
| Some(AppDataRef { | ||
| data: Ref::filter_map(data, |data| data.downcast_ref()).ok()?, | ||
| borrow: &self.borrow, | ||
| _guard: guard, | ||
| }) | ||
| } | ||
|
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| #[track_caller] | ||
| pub(crate) fn borrow_mut<T: 'static>( | ||
| &self, | ||
| guard: Option<LuaGuard>, | ||
| ) -> Option<AppDataRefMut<T>> { | ||
| let data = unsafe { &*self.container.get() } | ||
| .get(&TypeId::of::<T>())? | ||
| .borrow_mut(); | ||
| self.borrow.set(self.borrow.get() + 1); | ||
| Some(AppDataRefMut { | ||
| data: RefMut::filter_map(data, |data| data.downcast_mut()).ok()?, | ||
| borrow: &self.borrow, | ||
| _guard: guard, | ||
| }) | ||
| } | ||
|
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| #[track_caller] | ||
| pub(crate) fn remove<T: 'static>(&self) -> Option<T> { | ||
| if self.borrow.get() != 0 { | ||
| panic!("cannot mutably borrow app data container"); | ||
| } | ||
| // SAFETY: we checked that there are no other references to the container | ||
| unsafe { &mut *self.container.get() } | ||
| .remove(&TypeId::of::<T>())? | ||
| .into_inner() | ||
| .downcast::<T>() | ||
| .ok() | ||
| .map(|data| *data) | ||
| } | ||
| } | ||
|
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| /// A wrapper type for an immutably borrowed value from an app data container. | ||
| /// | ||
| /// This type is similar to [`Ref`]. | ||
| pub struct AppDataRef<'a, T: ?Sized + 'a> { | ||
| data: Ref<'a, T>, | ||
| borrow: &'a Cell<usize>, | ||
| _guard: Option<LuaGuard>, | ||
| } | ||
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| impl<T: ?Sized> Drop for AppDataRef<'_, T> { | ||
| fn drop(&mut self) { | ||
| self.borrow.set(self.borrow.get() - 1); | ||
| } | ||
| } | ||
|
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| impl<T: ?Sized> Deref for AppDataRef<'_, T> { | ||
| type Target = T; | ||
|
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| #[inline] | ||
| fn deref(&self) -> &Self::Target { | ||
| &self.data | ||
| } | ||
| } | ||
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| impl<T: ?Sized + fmt::Display> fmt::Display for AppDataRef<'_, T> { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| (**self).fmt(f) | ||
| } | ||
| } | ||
|
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| impl<T: ?Sized + fmt::Debug> fmt::Debug for AppDataRef<'_, T> { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| (**self).fmt(f) | ||
| } | ||
| } | ||
|
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| /// A wrapper type for a mutably borrowed value from an app data container. | ||
| /// | ||
| /// This type is similar to [`RefMut`]. | ||
| pub struct AppDataRefMut<'a, T: ?Sized + 'a> { | ||
| data: RefMut<'a, T>, | ||
| borrow: &'a Cell<usize>, | ||
| _guard: Option<LuaGuard>, | ||
| } | ||
|
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| impl<T: ?Sized> Drop for AppDataRefMut<'_, T> { | ||
| fn drop(&mut self) { | ||
| self.borrow.set(self.borrow.get() - 1); | ||
| } | ||
| } | ||
|
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| impl<T: ?Sized> Deref for AppDataRefMut<'_, T> { | ||
| type Target = T; | ||
|
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| #[inline] | ||
| fn deref(&self) -> &Self::Target { | ||
| &self.data | ||
| } | ||
| } | ||
|
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| impl<T: ?Sized> DerefMut for AppDataRefMut<'_, T> { | ||
| #[inline] | ||
| fn deref_mut(&mut self) -> &mut Self::Target { | ||
| &mut self.data | ||
| } | ||
| } | ||
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| impl<T: ?Sized + fmt::Display> fmt::Display for AppDataRefMut<'_, T> { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| (**self).fmt(f) | ||
| } | ||
| } | ||
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| impl<T: ?Sized + fmt::Debug> fmt::Debug for AppDataRefMut<'_, T> { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| (**self).fmt(f) | ||
| } | ||
| } | ||
|
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| #[cfg(test)] | ||
| mod assertions { | ||
| use super::*; | ||
|
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| #[cfg(not(feature = "send"))] | ||
| static_assertions::assert_not_impl_any!(AppData: Send); | ||
| #[cfg(feature = "send")] | ||
| static_assertions::assert_impl_all!(AppData: Send); | ||
|
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| // Must be !Send | ||
| static_assertions::assert_not_impl_any!(AppDataRef<()>: Send); | ||
| static_assertions::assert_not_impl_any!(AppDataRefMut<()>: Send); | ||
| } |