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/* 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 http://mozilla.org/MPL/2.0/. */
use dom::bindings::error::Fallible;
use dom::bindings::global::GlobalRef;
use dom::bindings::reflector::{Reflectable, Reflector};
use js::jsapi::{JSAutoCompartment, RootedObject, CallArgs, JS_GetFunctionObject, JS_NewFunction};
use js::jsapi::{JSContext, HandleValue, HandleObject, IsPromiseObject, CallOriginalPromiseResolve};
use js::jsapi::{MutableHandleObject, NewPromiseObject};
use js::jsval::{JSVal, UndefinedValue};
use std::ptr;
use std::rc::Rc;
#[dom_struct]
pub struct Promise {
reflector: Reflector
}
impl Promise {
#[allow(unsafe_code)]
pub fn new(global: GlobalRef) -> Rc<Promise> {
let cx = global.get_cx();
let mut obj = RootedObject::new(cx, ptr::null_mut());
unsafe {
Promise::create_js_promise(cx, HandleObject::null(), obj.handle_mut());
}
Promise::new_with_js_promise(obj.handle())
}
#[allow(unsafe_code, unrooted_must_root)]
fn new_with_js_promise(obj: HandleObject) -> Rc<Promise> {
unsafe {
assert!(IsPromiseObject(obj));
}
let mut promise = Promise {
reflector: Reflector::new(),
};
promise.init_reflector(obj.get());
Rc::new(promise)
}
#[allow(unsafe_code)]
unsafe fn create_js_promise(cx: *mut JSContext, proto: HandleObject, mut obj: MutableHandleObject) {
let do_nothing_func = JS_NewFunction(cx, Some(do_nothing_promise_executor), 2, 0, ptr::null());
assert!(!do_nothing_func.is_null());
let do_nothing_obj = RootedObject::new(cx, JS_GetFunctionObject(do_nothing_func));
assert!(!do_nothing_obj.handle().is_null());
*obj = NewPromiseObject(cx, do_nothing_obj.handle(), proto);
assert!(!obj.is_null());
}
#[allow(unrooted_must_root, unsafe_code)]
pub fn Resolve(global: GlobalRef,
cx: *mut JSContext,
value: HandleValue) -> Fallible<Rc<Promise>> {
let _ac = JSAutoCompartment::new(cx, global.reflector().get_jsobject().get());
let p = unsafe {
RootedObject::new(cx, CallOriginalPromiseResolve(cx, value))
};
assert!(!p.handle().is_null());
Ok(Promise::new_with_js_promise(p.handle()))
}
}
#[allow(unsafe_code)]
unsafe extern fn do_nothing_promise_executor(_cx: *mut JSContext, argc: u32, vp: *mut JSVal) -> bool {
let args = CallArgs::from_vp(vp, argc);
*args.rval() = UndefinedValue();
true
}
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