224 lines
7.9 KiB
C++
224 lines
7.9 KiB
C++
/*
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* Copyright (C) 2010, 2013, 2016, 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/Language.h>
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#include <wtf/HashMap.h>
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#include <wtf/Lock.h>
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#include <wtf/Logging.h>
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#include <wtf/NeverDestroyed.h>
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#include <wtf/text/TextStream.h>
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#include <wtf/text/WTFString.h>
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#if USE(CF) && !PLATFORM(WIN)
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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namespace WTF {
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static Lock cachedPlatformPreferredLanguagesLock;
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static Vector<String>& cachedFullPlatformPreferredLanguages() WTF_REQUIRES_LOCK(cachedPlatformPreferredLanguagesLock)
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{
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static NeverDestroyed<Vector<String>> languages;
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return languages;
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}
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static Vector<String>& cachedMinimizedPlatformPreferredLanguages() WTF_REQUIRES_LOCK(cachedPlatformPreferredLanguagesLock)
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{
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static NeverDestroyed<Vector<String>> languages;
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return languages;
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}
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static Lock preferredLanguagesOverrideLock;
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static Vector<String>& preferredLanguagesOverride() WTF_REQUIRES_LOCK(preferredLanguagesOverrideLock)
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{
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static NeverDestroyed<Vector<String>> override;
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return override;
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}
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typedef HashMap<void*, LanguageChangeObserverFunction> ObserverMap;
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static ObserverMap& observerMap()
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{
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static LazyNeverDestroyed<ObserverMap> map;
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static std::once_flag onceKey;
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std::call_once(onceKey, [&] {
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map.construct();
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});
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return map.get();
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}
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void addLanguageChangeObserver(void* context, LanguageChangeObserverFunction customObserver)
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{
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observerMap().set(context, customObserver);
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}
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void removeLanguageChangeObserver(void* context)
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{
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ASSERT(observerMap().contains(context));
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observerMap().remove(context);
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}
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void languageDidChange()
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{
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{
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Locker locker { cachedPlatformPreferredLanguagesLock };
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cachedFullPlatformPreferredLanguages().clear();
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cachedMinimizedPlatformPreferredLanguages().clear();
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}
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for (auto& observer : copyToVector(observerMap())) {
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if (observerMap().contains(observer.key))
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observer.value(observer.key);
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}
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}
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String defaultLanguage(ShouldMinimizeLanguages shouldMinimizeLanguages)
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{
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auto languages = userPreferredLanguages(shouldMinimizeLanguages);
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if (languages.size()) {
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LOG_WITH_STREAM(Language, stream << "defaultLanguage() is returning " << languages[0]);
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return languages[0];
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}
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LOG(Language, "defaultLanguage() is returning the empty string.");
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return emptyString();
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}
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Vector<String> userPreferredLanguagesOverride()
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{
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Locker locker { preferredLanguagesOverrideLock };
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return preferredLanguagesOverride();
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}
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void overrideUserPreferredLanguages(const Vector<String>& override)
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{
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LOG_WITH_STREAM(Language, stream << "Languages are being overridden to: " << override);
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{
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Locker locker { preferredLanguagesOverrideLock };
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preferredLanguagesOverride() = override;
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}
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languageDidChange();
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}
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static Vector<String> isolatedCopy(const Vector<String>& strings)
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{
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Vector<String> copy;
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copy.reserveInitialCapacity(strings.size());
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for (auto& language : strings)
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copy.uncheckedAppend(language.isolatedCopy());
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return copy;
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}
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Vector<String> userPreferredLanguages(ShouldMinimizeLanguages shouldMinimizeLanguages)
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{
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{
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Locker locker { preferredLanguagesOverrideLock };
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Vector<String>& override = preferredLanguagesOverride();
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if (!override.isEmpty()) {
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LOG_WITH_STREAM(Language, stream << "Languages are overridden: " << override);
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return isolatedCopy(override);
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}
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}
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Locker locker { cachedPlatformPreferredLanguagesLock };
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auto& languages = shouldMinimizeLanguages == ShouldMinimizeLanguages::Yes ? cachedMinimizedPlatformPreferredLanguages() : cachedFullPlatformPreferredLanguages();
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if (languages.isEmpty()) {
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LOG(Language, "userPreferredLanguages() cache miss");
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languages = platformUserPreferredLanguages(shouldMinimizeLanguages);
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} else
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LOG(Language, "userPreferredLanguages() cache hit");
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return isolatedCopy(languages);
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}
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#if !PLATFORM(COCOA)
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static String canonicalLanguageIdentifier(const String& languageCode)
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{
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String lowercaseLanguageCode = languageCode.convertToASCIILowercase();
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if (lowercaseLanguageCode.length() >= 3 && lowercaseLanguageCode[2] == '_')
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lowercaseLanguageCode.replace(2, 1, "-");
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return lowercaseLanguageCode;
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}
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size_t indexOfBestMatchingLanguageInList(const String& language, const Vector<String>& languageList, bool& exactMatch)
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{
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String lowercaseLanguage = language.convertToASCIILowercase();
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String languageWithoutLocaleMatch;
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String languageMatchButNotLocale;
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size_t languageWithoutLocaleMatchIndex = 0;
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size_t languageMatchButNotLocaleMatchIndex = 0;
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bool canMatchLanguageOnly = (lowercaseLanguage.length() == 2 || (lowercaseLanguage.length() >= 3 && lowercaseLanguage[2] == '-'));
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for (size_t i = 0; i < languageList.size(); ++i) {
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String canonicalizedLanguageFromList = canonicalLanguageIdentifier(languageList[i]);
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if (lowercaseLanguage == canonicalizedLanguageFromList) {
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exactMatch = true;
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return i;
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}
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if (canMatchLanguageOnly && canonicalizedLanguageFromList.length() >= 2) {
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if (lowercaseLanguage[0] == canonicalizedLanguageFromList[0] && lowercaseLanguage[1] == canonicalizedLanguageFromList[1]) {
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if (!languageWithoutLocaleMatch.length() && canonicalizedLanguageFromList.length() == 2) {
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languageWithoutLocaleMatch = languageList[i];
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languageWithoutLocaleMatchIndex = i;
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}
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if (!languageMatchButNotLocale.length() && canonicalizedLanguageFromList.length() >= 3) {
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languageMatchButNotLocale = languageList[i];
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languageMatchButNotLocaleMatchIndex = i;
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}
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}
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}
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}
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exactMatch = false;
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// If we have both a language-only match and a languge-but-not-locale match, return the
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// languge-only match as is considered a "better" match. For example, if the list
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// provided has both "en-GB" and "en" and the user prefers "en-US" we will return "en".
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if (languageWithoutLocaleMatch.length())
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return languageWithoutLocaleMatchIndex;
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if (languageMatchButNotLocale.length())
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return languageMatchButNotLocaleMatchIndex;
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return languageList.size();
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}
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#endif // !PLATFORM(COCOA)
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String displayNameForLanguageLocale(const String& localeName)
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{
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#if USE(CF) && !PLATFORM(WIN)
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if (!localeName.isEmpty())
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return adoptCF(CFLocaleCopyDisplayNameForPropertyValue(adoptCF(CFLocaleCopyCurrent()).get(), kCFLocaleIdentifier, localeName.createCFString().get())).get();
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#endif
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return localeName;
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}
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}
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