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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/. */
//! The `Reflector` struct.
use dom::bindings::global::{GlobalRef, GlobalRoot, global_root_from_reflector};
use dom::bindings::js::Root;
use js::jsapi::{HandleObject, JSContext, JSObject};
use std::cell::UnsafeCell;
use std::ptr;
/// Create the reflector for a new DOM object and yield ownership to the
/// reflector.
pub fn reflect_dom_object<T: Reflectable>(obj: Box<T>,
global: GlobalRef,
wrap_fn: fn(*mut JSContext, GlobalRef, Box<T>) -> Root<T>)
-> Root<T> {
wrap_fn(global.get_cx(), global, obj)
}
/// A struct to store a reference to the reflector of a DOM object.
#[allow(unrooted_must_root)]
#[must_root]
#[servo_lang = "reflector"]
#[derive(HeapSizeOf)]
// If you're renaming or moving this field, update the path in plugins::reflector as well
pub struct Reflector {
#[ignore_heap_size_of = "defined and measured in rust-mozjs"]
object: UnsafeCell<*mut JSObject>,
}
#[allow(unrooted_must_root)]
impl PartialEq for Reflector {
fn eq(&self, other: &Reflector) -> bool {
unsafe { *self.object.get() == *other.object.get() }
}
}
impl Reflector {
/// Get the reflector.
#[inline]
pub fn get_jsobject(&self) -> HandleObject {
unsafe { HandleObject::from_marked_location(self.object.get()) }
}
/// Initialize the reflector. (May be called only once.)
pub fn set_jsobject(&mut self, object: *mut JSObject) {
unsafe {
let obj = self.object.get();
assert!((*obj).is_null());
assert!(!object.is_null());
*obj = object;
}
}
/// Return a pointer to the memory location at which the JS reflector
/// object is stored. Used to root the reflector, as
/// required by the JSAPI rooting APIs.
pub fn rootable(&self) -> *mut *mut JSObject {
self.object.get()
}
/// Create an uninitialized `Reflector`.
pub fn new() -> Reflector {
Reflector {
object: UnsafeCell::new(ptr::null_mut()),
}
}
}
/// A trait to provide access to the `Reflector` for a DOM object.
pub trait Reflectable {
/// Returns the receiver's reflector.
fn reflector(&self) -> &Reflector;
/// Initializes the Reflector
fn init_reflector(&mut self, obj: *mut JSObject);
/// Returns the global object of the realm that the Reflectable was created in.
fn global(&self) -> GlobalRoot where Self: Sized {
global_root_from_reflector(self)
}
}
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