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- Improve HostDefined field to allow multiple stored types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| use std::any::TypeId; | ||
|
|
||
| use boa_gc::{GcRef, GcRefCell, GcRefMut}; | ||
| use boa_macros::{Finalize, Trace}; | ||
| use rustc_hash::FxHashMap; | ||
|
|
||
| use crate::object::NativeObject; | ||
|
|
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| /// Map used to store the host defined objects. | ||
| #[doc(hidden)] | ||
| type HostDefinedMap = FxHashMap<TypeId, Box<dyn NativeObject>>; | ||
|
|
||
| /// This represents a `ECMASCript` specification \[`HostDefined`\] field. | ||
| /// | ||
| /// This allows storing types which are mapped by their [`TypeId`]. | ||
| #[derive(Default, Trace, Finalize)] | ||
| #[allow(missing_debug_implementations)] | ||
| pub struct HostDefined { | ||
| state: GcRefCell<HostDefinedMap>, | ||
| } | ||
|
|
||
| impl HostDefined { | ||
| /// Insert a type into the [`HostDefined`]. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn insert_default<T: NativeObject + Default>(&self) -> Option<Box<dyn NativeObject>> { | ||
| self.state | ||
| .borrow_mut() | ||
| .insert(TypeId::of::<T>(), Box::<T>::default()) | ||
| } | ||
|
|
||
| /// Insert a type into the [`HostDefined`]. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn insert<T: NativeObject>(&self, value: T) -> Option<Box<dyn NativeObject>> { | ||
| self.state | ||
| .borrow_mut() | ||
| .insert(TypeId::of::<T>(), Box::new(value)) | ||
| } | ||
|
|
||
| /// Check if the [`HostDefined`] has type T. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed mutably. | ||
| #[track_caller] | ||
| pub fn has<T: NativeObject>(&self) -> bool { | ||
| self.state.borrow().contains_key(&TypeId::of::<T>()) | ||
| } | ||
|
|
||
| /// Remove type T from [`HostDefined`], if it exists. | ||
| /// | ||
| /// Returns [`Some`] with the object if it exits, [`None`] otherwise. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn remove<T: NativeObject>(&self) -> Option<Box<dyn NativeObject>> { | ||
| self.state.borrow_mut().remove(&TypeId::of::<T>()) | ||
| } | ||
|
|
||
| /// Get type T from [`HostDefined`], if it exits. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn get<T: NativeObject>(&self) -> Option<GcRef<'_, T>> { | ||
| let state = self.state.borrow(); | ||
|
|
||
| state | ||
| .get(&TypeId::of::<T>()) | ||
| .map(Box::as_ref) | ||
| .and_then(<dyn NativeObject>::downcast_ref::<T>)?; | ||
|
|
||
| Some(GcRef::map(state, |state| { | ||
| state | ||
| .get(&TypeId::of::<T>()) | ||
| .map(Box::as_ref) | ||
| .and_then(<dyn NativeObject>::downcast_ref::<T>) | ||
| .expect("Should not fail") | ||
| })) | ||
| } | ||
|
|
||
| /// Get type T from [`HostDefined`], if it exits. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn get_mut<T: NativeObject>(&self) -> Option<GcRefMut<'_, HostDefinedMap, T>> { | ||
| let mut state = self.state.borrow_mut(); | ||
|
|
||
| state | ||
| .get_mut(&TypeId::of::<T>()) | ||
| .map(Box::as_mut) | ||
| .and_then(<dyn NativeObject>::downcast_mut::<T>)?; | ||
|
|
||
| Some(GcRefMut::map( | ||
| state, | ||
| |state: &mut FxHashMap<TypeId, Box<dyn NativeObject>>| { | ||
| state | ||
| .get_mut(&TypeId::of::<T>()) | ||
| .map(Box::as_mut) | ||
| .and_then(<dyn NativeObject>::downcast_mut::<T>) | ||
| .expect("Should not fail") | ||
| }, | ||
| )) | ||
| } | ||
|
|
||
| /// Clears all the objects. | ||
| /// | ||
| /// # Panics | ||
| /// | ||
| /// Panics if [`HostDefined`] field is borrowed. | ||
| #[track_caller] | ||
| pub fn clear(&self) { | ||
| self.state.borrow_mut().clear(); | ||
| } | ||
| } |
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