8a62caabc3
This implements support for using Promises in WebIDL, executing promise callbacks in batches (equivalent to running all enqueued jobs from a setTimeout(0)), and attaching native callbacks to promise objects. This is the combined work of myself, @dati91, and @mmatyas based on the following prior work in Gecko: * Codegen.py * Promise.webidl * Promise.cpp/Promise.h * PromiseNativeHandler.h This does not implement microtasks per #4283. This allows us to make progress on testing code that requires the use of Promises right now; the microtasks work is more complicated, but also largely orthogonal to implement. Requires https://github.com/servo/mozjs/pull/89, https://github.com/servo/rust-mozjs/pull/287, and https://github.com/servo/rust-mozjs/pull/294. --- - [X] `./mach build -d` does not report any errors - [X] `./mach test-tidy` does not report any errors - [X] These changes fix #4282 - [X] There are tests for these changes Source-Repo: https://github.com/servo/servo Source-Revision: 2b1a39c2ae14b78e437551d05f0e691a13e5d183
50 lines
1.6 KiB
Rust
50 lines
1.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::bindings::codegen::Bindings::PromiseNativeHandlerBinding;
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use dom::bindings::global::GlobalRef;
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use dom::bindings::js::Root;
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use dom::bindings::reflector::{Reflector, reflect_dom_object};
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use dom::bindings::trace::JSTraceable;
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use heapsize::HeapSizeOf;
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use js::jsapi::{JSContext, HandleValue};
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pub trait Callback: JSTraceable + HeapSizeOf {
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fn callback(&self, cx: *mut JSContext, v: HandleValue);
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}
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#[dom_struct]
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pub struct PromiseNativeHandler {
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reflector: Reflector,
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resolve: Option<Box<Callback>>,
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reject: Option<Box<Callback>>,
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}
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impl PromiseNativeHandler {
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pub fn new(global: GlobalRef,
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resolve: Option<Box<Callback>>,
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reject: Option<Box<Callback>>)
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-> Root<PromiseNativeHandler> {
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reflect_dom_object(box PromiseNativeHandler {
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reflector: Reflector::new(),
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resolve: resolve,
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reject: reject,
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}, global, PromiseNativeHandlerBinding::Wrap)
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}
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fn callback(callback: &Option<Box<Callback>>, cx: *mut JSContext, v: HandleValue) {
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if let Some(ref callback) = *callback {
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callback.callback(cx, v)
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}
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}
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pub fn resolved_callback(&self, cx: *mut JSContext, v: HandleValue) {
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PromiseNativeHandler::callback(&self.resolve, cx, v)
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}
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pub fn rejected_callback(&self, cx: *mut JSContext, v: HandleValue) {
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PromiseNativeHandler::callback(&self.reject, cx, v)
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}
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}
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