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fcbf80b0fb
I wrote this for bug 1682003, but I split it off it because I don't really _need_ it (I need it on one place where I know I have valid utf-8). I think this is a sensible thing to do though. This throws on invalid utf-8 via: https://searchfox.org/mozilla-central/rev/0bcf81557b89e7757c44e25bb4bc7f4cb8619dc9/js/src/vm/CharacterEncoding.cpp#432 This would allow doing stuff like resolving promises using nsCStrings slightly more conveniently / efficiently than using NS_ConvertUTF*. Differential Revision: https://phabricator.services.mozilla.com/D99589
124 lines
4.4 KiB
C++
124 lines
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/ToJSValue.h"
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#include "mozilla/dom/DOMException.h"
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#include "mozilla/dom/Exceptions.h"
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#include "mozilla/dom/Promise.h"
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#include "mozilla/dom/WindowProxyHolder.h"
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#include "nsAString.h"
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#include "nsContentUtils.h"
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#include "nsStringBuffer.h"
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#include "xpcpublic.h"
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namespace mozilla::dom {
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bool ToJSValue(JSContext* aCx, const nsAString& aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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// Make sure we're called in a compartment
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MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
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// XXXkhuey I'd love to use xpc::NonVoidStringToJsval here, but it requires
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// a non-const nsAString for silly reasons.
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nsStringBuffer* sharedBuffer;
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if (!XPCStringConvert::ReadableToJSVal(aCx, aArgument, &sharedBuffer,
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aValue)) {
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return false;
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}
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if (sharedBuffer) {
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NS_ADDREF(sharedBuffer);
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}
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return true;
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}
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bool ToJSValue(JSContext* aCx, const nsACString& aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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return UTF8StringToJsval(aCx, aArgument, aValue);
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}
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bool ToJSValue(JSContext* aCx, nsresult aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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RefPtr<Exception> exception = CreateException(aArgument);
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return ToJSValue(aCx, exception, aValue);
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}
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bool ToJSValue(JSContext* aCx, ErrorResult&& aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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MOZ_ASSERT(aArgument.Failed());
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MOZ_ASSERT(
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!aArgument.IsUncatchableException(),
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"Doesn't make sense to convert uncatchable exception to a JS value!");
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MOZ_ALWAYS_TRUE(aArgument.MaybeSetPendingException(aCx));
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MOZ_ALWAYS_TRUE(JS_GetPendingException(aCx, aValue));
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JS_ClearPendingException(aCx);
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return true;
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}
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bool ToJSValue(JSContext* aCx, Promise& aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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aValue.setObject(*aArgument.PromiseObj());
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return MaybeWrapObjectValue(aCx, aValue);
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}
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bool ToJSValue(JSContext* aCx, const WindowProxyHolder& aArgument,
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JS::MutableHandle<JS::Value> aValue) {
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BrowsingContext* bc = aArgument.get();
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if (!bc) {
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aValue.setNull();
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return true;
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}
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JS::Rooted<JSObject*> windowProxy(aCx);
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if (bc->IsInProcess()) {
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windowProxy = bc->GetWindowProxy();
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if (!windowProxy) {
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nsPIDOMWindowOuter* window = bc->GetDOMWindow();
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if (!window) {
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// Torn down enough that we should just return null.
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aValue.setNull();
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return true;
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}
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if (!window->EnsureInnerWindow()) {
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return Throw(aCx, NS_ERROR_UNEXPECTED);
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}
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windowProxy = bc->GetWindowProxy();
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}
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return ToJSValue(aCx, windowProxy, aValue);
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}
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if (!GetRemoteOuterWindowProxy(aCx, bc, /* aTransplantTo = */ nullptr,
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&windowProxy)) {
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return false;
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}
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aValue.setObjectOrNull(windowProxy);
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return true;
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}
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// Static assertion tests for the `binding_detail::ScriptableInterfaceType`
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// helper template, used by `ToJSValue`.
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namespace binding_detail {
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static_assert(std::is_same_v<ScriptableInterfaceType<nsISupports>, nsISupports>,
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"nsISupports works with ScriptableInterfaceType");
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static_assert(
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std::is_same_v<ScriptableInterfaceType<nsIGlobalObject>, nsISupports>,
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"non-scriptable interfaces get a fallback");
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static_assert(std::is_same_v<ScriptableInterfaceType<nsIObserver>, nsIObserver>,
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"scriptable interfaces should get the correct type");
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static_assert(std::is_same_v<ScriptableInterfaceType<nsIRunnable>, nsIRunnable>,
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"scriptable interfaces should get the correct type");
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class SingleScriptableInterface : public nsIObserver {};
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static_assert(
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std::is_same_v<ScriptableInterfaceType<SingleScriptableInterface>,
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nsIObserver>,
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"Concrete type with one scriptable interface picks the correct interface");
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class MultiScriptableInterface : public nsIObserver, public nsIRunnable {};
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static_assert(std::is_same_v<ScriptableInterfaceType<MultiScriptableInterface>,
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nsISupports>,
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"Concrete type with multiple scriptable interfaces falls back");
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} // namespace binding_detail
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} // namespace mozilla::dom
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