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/*
* Copyright (C) 2010, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/language.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/renderer/platform/text/platform_locale.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/thread_specific.h"
namespace blink {
namespace {
static String CanonicalizeLanguageIdentifier(const String& language_code) {
String copied_code = language_code;
// Platform::defaultLocale() might provide a language code with '_'.
copied_code.Replace('_', '-');
return copied_code;
}
// Main thread static AtomicString. This can be safely shared across threads.
const AtomicString* g_platform_language = nullptr;
const AtomicString& PlatformLanguage() {
DCHECK(g_platform_language->Impl()->IsStatic())
<< "global language string is used from multiple threads, and must be "
"static";
return *g_platform_language;
}
Vector<AtomicString>& PreferredLanguagesOverride() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(ThreadSpecific<Vector<AtomicString>>,
thread_specific_languages, ());
return *thread_specific_languages;
}
} // namespace
void InitializePlatformLanguage() {
DCHECK(IsMainThread());
DEFINE_STATIC_LOCAL(
// We add the platform language as a static string for two reasons:
// 1. it can be shared across threads.
// 2. since this is done very early on, we don't want to accidentally
// collide with a hard coded static string (like "fr" on SVG).
const AtomicString, platform_language, (([]() {
String canonicalized = CanonicalizeLanguageIdentifier(
Platform::Current()->DefaultLocale());
if (!canonicalized.empty()) {
StringImpl* impl =
StringImpl::CreateStatic(base::as_chars(canonicalized.Span8()));
return AtomicString(impl);
}
return AtomicString();
})()));
g_platform_language = &platform_language;
}
void OverrideUserPreferredLanguagesForTesting(
const Vector<AtomicString>& override) {
Vector<AtomicString>& canonicalized = PreferredLanguagesOverride();
canonicalized.resize(0);
canonicalized.reserve(override.size());
for (const auto& lang : override)
canonicalized.push_back(CanonicalizeLanguageIdentifier(lang));
Locale::ResetDefaultLocale();
}
AtomicString DefaultLanguage() {
Vector<AtomicString>& override = PreferredLanguagesOverride();
if (!override.empty())
return override[0];
return PlatformLanguage();
}
Vector<AtomicString> UserPreferredLanguages() {
Vector<AtomicString>& override = PreferredLanguagesOverride();
if (!override.empty())
return override;
Vector<AtomicString> languages;
languages.ReserveInitialCapacity(1);
languages.push_back(PlatformLanguage());
return languages;
}
wtf_size_t IndexOfBestMatchingLanguageInList(
const AtomicString& language,
const Vector<AtomicString>& language_list) {
AtomicString language_without_locale_match;
AtomicString language_match_but_not_locale;
wtf_size_t language_without_locale_match_index = 0;
wtf_size_t language_match_but_not_locale_match_index = 0;
bool can_match_language_only =
(language.length() == 2 ||
(language.length() >= 3 && language[2] == '-'));
for (wtf_size_t i = 0; i < language_list.size(); ++i) {
String canonicalized_language_from_list =
CanonicalizeLanguageIdentifier(language_list[i]);
if (language == canonicalized_language_from_list)
return i;
if (can_match_language_only &&
canonicalized_language_from_list.length() >= 2) {
if (language[0] == canonicalized_language_from_list[0] &&
language[1] == canonicalized_language_from_list[1]) {
if (!language_without_locale_match.length() &&
canonicalized_language_from_list.length() == 2) {
language_without_locale_match = language_list[i];
language_without_locale_match_index = i;
}
if (!language_match_but_not_locale.length() &&
canonicalized_language_from_list.length() >= 3) {
language_match_but_not_locale = language_list[i];
language_match_but_not_locale_match_index = i;
}
}
}
}
// If we have both a language-only match and a languge-but-not-locale match,
// return the languge-only match as is considered a "better" match. For
// example, if the list provided has both "en-GB" and "en" and the user
// prefers "en-US" we will return "en".
if (language_without_locale_match.length())
return language_without_locale_match_index;
if (language_match_but_not_locale.length())
return language_match_but_not_locale_match_index;
return language_list.size();
}
} // namespace blink
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