Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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,
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "nsAString.h"
#include "nsContentUtils.h"
#include "xpcpublic.h"
namespace mozilla::dom {
bool ToJSValue(JSContext* aCx, const nsAString& aArgument,
JS::MutableHandle<JS::Value> aValue) {
// Make sure we're called in a compartment
MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
return xpc::NonVoidStringToJsval(aCx, aArgument, aValue);
}
bool ToJSValue(JSContext* aCx, const nsACString& aArgument,
JS::MutableHandle<JS::Value> aValue) {
return UTF8StringToJsval(aCx, aArgument, aValue);
}
bool ToJSValue(JSContext* aCx, nsresult aArgument,
JS::MutableHandle<JS::Value> aValue) {
RefPtr<Exception> exception = CreateException(aArgument);
return ToJSValue(aCx, exception, aValue);
}
bool ToJSValue(JSContext* aCx, ErrorResult&& aArgument,
JS::MutableHandle<JS::Value> aValue) {
MOZ_ASSERT(aArgument.Failed());
MOZ_ASSERT(
!aArgument.IsUncatchableException(),
"Doesn't make sense to convert uncatchable exception to a JS value!");
MOZ_ALWAYS_TRUE(aArgument.MaybeSetPendingException(aCx));
MOZ_ALWAYS_TRUE(JS_GetPendingException(aCx, aValue));
JS_ClearPendingException(aCx);
return true;
}
bool ToJSValue(JSContext* aCx, Promise& aArgument,
JS::MutableHandle<JS::Value> aValue) {
aValue.setObject(*aArgument.PromiseObj());
return MaybeWrapObjectValue(aCx, aValue);
}
bool ToJSValue(JSContext* aCx, const WindowProxyHolder& aArgument,
JS::MutableHandle<JS::Value> aValue) {
BrowsingContext* bc = aArgument.get();
if (!bc) {
aValue.setNull();
return true;
}
JS::Rooted<JSObject*> windowProxy(aCx);
if (bc->IsInProcess()) {
windowProxy = bc->GetWindowProxy();
if (!windowProxy) {
nsPIDOMWindowOuter* window = bc->GetDOMWindow();
if (!window) {
// Torn down enough that we should just return null.
aValue.setNull();
return true;
}
if (!window->EnsureInnerWindow()) {
return Throw(aCx, NS_ERROR_UNEXPECTED);
}
windowProxy = bc->GetWindowProxy();
}
return ToJSValue(aCx, windowProxy, aValue);
}
if (!GetRemoteOuterWindowProxy(aCx, bc, /* aTransplantTo = */ nullptr,
&windowProxy)) {
return false;
}
aValue.setObjectOrNull(windowProxy);
return true;
}
// Static assertion tests for the `binding_detail::ScriptableInterfaceType`
// helper template, used by `ToJSValue`.
namespace binding_detail {
static_assert(std::is_same_v<ScriptableInterfaceType<nsISupports>, nsISupports>,
"nsISupports works with ScriptableInterfaceType");
static_assert(
std::is_same_v<ScriptableInterfaceType<nsIGlobalObject>, nsISupports>,
"non-scriptable interfaces get a fallback");
static_assert(std::is_same_v<ScriptableInterfaceType<nsIObserver>, nsIObserver>,
"scriptable interfaces should get the correct type");
static_assert(std::is_same_v<ScriptableInterfaceType<nsIRunnable>, nsIRunnable>,
"scriptable interfaces should get the correct type");
class SingleScriptableInterface : public nsIObserver {};
static_assert(
std::is_same_v<ScriptableInterfaceType<SingleScriptableInterface>,
nsIObserver>,
"Concrete type with one scriptable interface picks the correct interface");
class MultiScriptableInterface : public nsIObserver, public nsIRunnable {};
static_assert(std::is_same_v<ScriptableInterfaceType<MultiScriptableInterface>,
nsISupports>,
"Concrete type with multiple scriptable interfaces falls back");
} // namespace binding_detail
} // namespace mozilla::dom