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-rw-r--r--js/xpconnect/src/XPCLocale.cpp153
1 files changed, 153 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCLocale.cpp b/js/xpconnect/src/XPCLocale.cpp
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+++ b/js/xpconnect/src/XPCLocale.cpp
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+/* -*- 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, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Assertions.h"
+
+#include "js/LocaleSensitive.h"
+
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIPrefService.h"
+#include "nsServiceManagerUtils.h"
+#include "mozilla/Services.h"
+#include "mozilla/CycleCollectedJSRuntime.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/intl/LocaleService.h"
+#include "mozilla/Preferences.h"
+
+#include "xpcpublic.h"
+#include "xpcprivate.h"
+
+using namespace mozilla;
+using mozilla::intl::LocaleService;
+
+class XPCLocaleObserver : public nsIObserver {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIOBSERVER
+
+ void Init();
+
+ private:
+ virtual ~XPCLocaleObserver() = default;
+};
+
+NS_IMPL_ISUPPORTS(XPCLocaleObserver, nsIObserver);
+
+void XPCLocaleObserver::Init() {
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+
+ observerService->AddObserver(this, "intl:app-locales-changed", false);
+
+ Preferences::AddStrongObserver(this, "javascript.use_us_english_locale");
+}
+
+NS_IMETHODIMP
+XPCLocaleObserver::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ if (!strcmp(aTopic, "intl:app-locales-changed") ||
+ (!strcmp(aTopic, "nsPref:changed") &&
+ !NS_strcmp(aData, u"javascript.use_us_english_locale"))) {
+ JSRuntime* rt = CycleCollectedJSRuntime::Get()->Runtime();
+ if (!xpc_LocalizeRuntime(rt)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ return NS_OK;
+ }
+
+ return NS_ERROR_UNEXPECTED;
+}
+
+/**
+ * JS locale callbacks implemented by XPCOM modules. These are theoretically
+ * safe for use on multiple threads. Unfortunately, the intl code underlying
+ * these XPCOM modules doesn't yet support this, so in practice
+ * XPCLocaleCallbacks are limited to the main thread.
+ */
+struct XPCLocaleCallbacks : public JSLocaleCallbacks {
+ XPCLocaleCallbacks() {
+ MOZ_COUNT_CTOR(XPCLocaleCallbacks);
+
+ // Disable the toLocaleUpper/Lower case hooks to use the standard,
+ // locale-insensitive definition from String.prototype. (These hooks are
+ // only consulted when JS_HAS_INTL_API is not set.) Since JS_HAS_INTL_API
+ // is always set, these hooks should be disabled.
+ localeToUpperCase = nullptr;
+ localeToLowerCase = nullptr;
+ localeCompare = nullptr;
+ localeToUnicode = nullptr;
+
+ // It's going to be retained by the ObserverService.
+ RefPtr<XPCLocaleObserver> locObs = new XPCLocaleObserver();
+ locObs->Init();
+ }
+
+ ~XPCLocaleCallbacks() {
+ AssertThreadSafety();
+ MOZ_COUNT_DTOR(XPCLocaleCallbacks);
+ }
+
+ /**
+ * Return the XPCLocaleCallbacks that's hidden away in |rt|. (This impl uses
+ * the locale callbacks struct to store away its per-context data.)
+ */
+ static XPCLocaleCallbacks* This(JSRuntime* rt) {
+ // Locale information for |cx| was associated using xpc_LocalizeContext;
+ // assert and double-check this.
+ const JSLocaleCallbacks* lc = JS_GetLocaleCallbacks(rt);
+ MOZ_ASSERT(lc);
+ MOZ_ASSERT(lc->localeToUpperCase == nullptr);
+ MOZ_ASSERT(lc->localeToLowerCase == nullptr);
+ MOZ_ASSERT(lc->localeCompare == nullptr);
+ MOZ_ASSERT(lc->localeToUnicode == nullptr);
+
+ const XPCLocaleCallbacks* ths = static_cast<const XPCLocaleCallbacks*>(lc);
+ ths->AssertThreadSafety();
+ return const_cast<XPCLocaleCallbacks*>(ths);
+ }
+
+ private:
+ void AssertThreadSafety() const {
+ NS_ASSERT_OWNINGTHREAD(XPCLocaleCallbacks);
+ }
+
+ NS_DECL_OWNINGTHREAD
+};
+
+bool xpc_LocalizeRuntime(JSRuntime* rt) {
+ // We want to assign the locale callbacks only the first time we
+ // localize the context.
+ // All consequent calls to this function are result of language changes
+ // and should not assign it again.
+ const JSLocaleCallbacks* lc = JS_GetLocaleCallbacks(rt);
+ if (!lc) {
+ JS_SetLocaleCallbacks(rt, new XPCLocaleCallbacks());
+ }
+
+ // Set the default locale.
+
+ // Check a pref to see if we should use US English locale regardless
+ // of the system locale.
+ if (Preferences::GetBool("javascript.use_us_english_locale", false)) {
+ return JS_SetDefaultLocale(rt, "en-US");
+ }
+
+ // No pref has been found, so get the default locale from the
+ // regional prefs locales.
+ AutoTArray<nsCString, 10> rpLocales;
+ LocaleService::GetInstance()->GetRegionalPrefsLocales(rpLocales);
+
+ MOZ_ASSERT(rpLocales.Length() > 0);
+ return JS_SetDefaultLocale(rt, rpLocales[0].get());
+}
+
+void xpc_DelocalizeRuntime(JSRuntime* rt) {
+ const XPCLocaleCallbacks* lc = XPCLocaleCallbacks::This(rt);
+ JS_SetLocaleCallbacks(rt, nullptr);
+ delete lc;
+}