mirror of
https://github.com/servo/servo.git
synced 2025-06-11 01:50:10 +00:00
48d193cb83
* extract code into CachedFrozenArray Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com> * fix borrow crash Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com> * fix already borrowed error using an else will cause the borrow to live more than it needs Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com> * restore return statement Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com> --------- Signed-off-by: Gae24 <96017547+Gae24@users.noreply.github.com>
52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
|
|
|
|
use js::conversions::ToJSValConvertible;
|
|
use js::jsapi::Heap;
|
|
use js::jsval::JSVal;
|
|
use js::rust::MutableHandleValue;
|
|
|
|
use crate::dom::bindings::cell::DomRefCell;
|
|
use crate::dom::bindings::utils::to_frozen_array;
|
|
use crate::script_runtime::JSContext;
|
|
|
|
#[derive(JSTraceable)]
|
|
pub struct CachedFrozenArray {
|
|
frozen_value: DomRefCell<Option<Heap<JSVal>>>,
|
|
}
|
|
|
|
impl CachedFrozenArray {
|
|
pub fn new() -> CachedFrozenArray {
|
|
CachedFrozenArray {
|
|
frozen_value: DomRefCell::new(None),
|
|
}
|
|
}
|
|
|
|
pub fn get_or_init<F: FnOnce() -> Vec<T>, T: ToJSValConvertible>(
|
|
&self,
|
|
f: F,
|
|
cx: JSContext,
|
|
mut retval: MutableHandleValue,
|
|
) {
|
|
if let Some(inner) = &*self.frozen_value.borrow() {
|
|
retval.set(inner.get());
|
|
return;
|
|
}
|
|
|
|
let array = f();
|
|
to_frozen_array(array.as_slice(), cx, retval);
|
|
|
|
// Safety: need to create the Heap value in its final memory location before setting it.
|
|
*self.frozen_value.borrow_mut() = Some(Heap::default());
|
|
self.frozen_value
|
|
.borrow()
|
|
.as_ref()
|
|
.unwrap()
|
|
.set(retval.get());
|
|
}
|
|
|
|
pub fn clear(&self) {
|
|
*self.frozen_value.borrow_mut() = None;
|
|
}
|
|
}
|