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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 https://mozilla.org/MPL/2.0/. */
//! Various utilities to glue JavaScript and the DOM implementation together.
use std::cell::RefCell;
use std::thread::LocalKey;
use js::conversions::ToJSValConvertible;
use js::glue::{IsWrapper, JSPrincipalsCallbacks, UnwrapObjectDynamic, UnwrapObjectStatic};
use js::jsapi::{
CallArgs, DOMCallbacks, HandleObject as RawHandleObject, JS_FreezeObject, JSContext, JSObject,
};
use js::rust::{HandleObject, MutableHandleValue, get_object_class, is_dom_class};
use script_bindings::interfaces::DomHelpers;
use script_bindings::settings_stack::StackEntry;
use crate::DomTypes;
use crate::dom::bindings::codegen::{InterfaceObjectMap, PrototypeList};
use crate::dom::bindings::constructor::{
call_html_constructor, pop_current_element_queue, push_new_element_queue,
};
use crate::dom::bindings::conversions::DerivedFrom;
use crate::dom::bindings::error::{Error, report_pending_exception, throw_dom_exception};
use crate::dom::bindings::principals::PRINCIPALS_CALLBACKS;
use crate::dom::bindings::proxyhandler::is_platform_object_same_origin;
use crate::dom::bindings::reflector::{DomObject, DomObjectWrap, reflect_dom_object};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::settings_stack;
use crate::dom::globalscope::GlobalScope;
use crate::dom::windowproxy::WindowProxyHandler;
use crate::realms::InRealm;
use crate::script_runtime::{CanGc, JSContext as SafeJSContext};
#[derive(JSTraceable, MallocSizeOf)]
/// Static data associated with a global object.
pub(crate) struct GlobalStaticData {
#[ignore_malloc_size_of = "WindowProxyHandler does not properly implement it anyway"]
/// The WindowProxy proxy handler for this global.
pub(crate) windowproxy_handler: &'static WindowProxyHandler,
}
impl GlobalStaticData {
/// Creates a new GlobalStaticData.
pub(crate) fn new() -> GlobalStaticData {
GlobalStaticData {
windowproxy_handler: WindowProxyHandler::proxy_handler(),
}
}
}
pub(crate) use script_bindings::utils::*;
/// Returns a JSVal representing the frozen JavaScript array
pub(crate) fn to_frozen_array<T: ToJSValConvertible>(
convertibles: &[T],
cx: SafeJSContext,
mut rval: MutableHandleValue,
_can_gc: CanGc,
) {
unsafe { convertibles.to_jsval(*cx, rval.reborrow()) };
rooted!(in(*cx) let obj = rval.to_object());
unsafe { JS_FreezeObject(*cx, RawHandleObject::from(obj.handle())) };
}
/// Returns wether `obj` is a platform object using dynamic unwrap
/// <https://heycam.github.io/webidl/#dfn-platform-object>
#[allow(dead_code)]
pub(crate) fn is_platform_object_dynamic(obj: *mut JSObject, cx: *mut JSContext) -> bool {
is_platform_object(obj, &|o| unsafe {
UnwrapObjectDynamic(o, cx, /* stopAtWindowProxy = */ false)
})
}
/// Returns wether `obj` is a platform object using static unwrap
/// <https://heycam.github.io/webidl/#dfn-platform-object>
pub(crate) fn is_platform_object_static(obj: *mut JSObject) -> bool {
is_platform_object(obj, &|o| unsafe { UnwrapObjectStatic(o) })
}
fn is_platform_object(
obj: *mut JSObject,
unwrap_obj: &dyn Fn(*mut JSObject) -> *mut JSObject,
) -> bool {
unsafe {
// Fast-path the common case
let mut clasp = get_object_class(obj);
if is_dom_class(&*clasp) {
return true;
}
// Now for simplicity check for security wrappers before anything else
if IsWrapper(obj) {
let unwrapped_obj = unwrap_obj(obj);
if unwrapped_obj.is_null() {
return false;
}
clasp = get_object_class(obj);
}
// TODO also check if JS_IsArrayBufferObject
is_dom_class(&*clasp)
}
}
unsafe extern "C" fn instance_class_has_proto_at_depth(
clasp: *const js::jsapi::JSClass,
proto_id: u32,
depth: u32,
) -> bool {
let domclass: *const DOMJSClass = clasp as *const _;
let domclass = &*domclass;
domclass.dom_class.interface_chain[depth as usize] as u32 == proto_id
}
#[allow(missing_docs)] // FIXME
pub(crate) const DOM_CALLBACKS: DOMCallbacks = DOMCallbacks {
instanceClassMatchesProto: Some(instance_class_has_proto_at_depth),
};
impl DomHelpers<crate::DomTypeHolder> for crate::DomTypeHolder {
fn throw_dom_exception(
cx: SafeJSContext,
global: &<crate::DomTypeHolder as DomTypes>::GlobalScope,
result: Error,
can_gc: CanGc,
) {
throw_dom_exception(cx, global, result, can_gc)
}
fn call_html_constructor<
T: DerivedFrom<<crate::DomTypeHolder as DomTypes>::Element> + DomObject,
>(
cx: SafeJSContext,
args: &CallArgs,
global: &<crate::DomTypeHolder as DomTypes>::GlobalScope,
proto_id: PrototypeList::ID,
creator: unsafe fn(SafeJSContext, HandleObject, *mut ProtoOrIfaceArray),
can_gc: CanGc,
) -> bool {
call_html_constructor::<T>(cx, args, global, proto_id, creator, can_gc)
}
fn settings_stack() -> &'static LocalKey<RefCell<Vec<StackEntry<crate::DomTypeHolder>>>> {
&settings_stack::STACK
}
fn principals_callbacks() -> &'static JSPrincipalsCallbacks {
&PRINCIPALS_CALLBACKS
}
fn is_platform_object_same_origin(cx: SafeJSContext, obj: RawHandleObject) -> bool {
unsafe { is_platform_object_same_origin(cx, obj) }
}
fn interface_map() -> &'static phf::Map<&'static [u8], for<'a> fn(SafeJSContext, HandleObject)>
{
&InterfaceObjectMap::MAP
}
fn push_new_element_queue() {
push_new_element_queue()
}
fn pop_current_element_queue(can_gc: CanGc) {
pop_current_element_queue(can_gc)
}
fn reflect_dom_object<T, U>(obj: Box<T>, global: &U, can_gc: CanGc) -> DomRoot<T>
where
T: DomObject + DomObjectWrap<crate::DomTypeHolder>,
U: DerivedFrom<GlobalScope>,
{
reflect_dom_object(obj, global, can_gc)
}
fn report_pending_exception(
cx: SafeJSContext,
dispatch_event: bool,
realm: InRealm,
can_gc: CanGc,
) {
report_pending_exception(cx, dispatch_event, realm, can_gc)
}
}
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