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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/fonts/AcceptLanguagesResolver.h"
#include "platform/Language.h"
#include "platform/text/LocaleToScriptMapping.h"
#include <unicode/locid.h>
namespace blink {
UScriptCode AcceptLanguagesResolver::m_preferredHanScript = USCRIPT_COMMON;
const char* AcceptLanguagesResolver::m_preferredHanSkFontMgrLocale = nullptr;
// SkFontMgr requires script-based locale names, like "zh-Hant" and "zh-Hans",
// instead of "zh-CN" and "zh-TW".
static const char* toSkFontMgrLocaleForHan(UScriptCode script)
{
switch (script) {
case USCRIPT_KATAKANA_OR_HIRAGANA:
return "ja-jp";
case USCRIPT_HANGUL:
return "ko-kr";
case USCRIPT_SIMPLIFIED_HAN:
return "zh-Hans";
case USCRIPT_TRADITIONAL_HAN:
return "zh-Hant";
default:
ASSERT_NOT_REACHED();
return nullptr;
}
}
void AcceptLanguagesResolver::acceptLanguagesChanged(
const String& acceptLanguages)
{
// Use the UI locale if it can disambiguate the Unified Han.
// Historically we use ICU on Windows. crbug.com/586520
#if OS(WIN)
// Since Chrome synchronizes the ICU default locale with its UI locale,
// this ICU locale tells the current UI locale of Chrome.
m_preferredHanScript = scriptCodeForHanFromLocale(
icu::Locale::getDefault().getName(), '_');
#else
m_preferredHanScript = scriptCodeForHanFromLocale(defaultLanguage());
#endif
if (m_preferredHanScript != USCRIPT_COMMON) {
// We don't need additional locale if defaultLanguage() can disambiguate
// since it's always passed to matchFamilyStyleCharacter() separately.
m_preferredHanSkFontMgrLocale = nullptr;
return;
}
updateFromAcceptLanguages(acceptLanguages);
}
void AcceptLanguagesResolver::updateFromAcceptLanguages(
const String& acceptLanguages)
{
// Use the first acceptLanguages that can disambiguate.
Vector<String> languages;
acceptLanguages.split(',', languages);
for (String token : languages) {
token = token.stripWhiteSpace();
m_preferredHanScript = scriptCodeForHanFromLocale(token);
if (m_preferredHanScript != USCRIPT_COMMON) {
m_preferredHanSkFontMgrLocale = toSkFontMgrLocaleForHan(
m_preferredHanScript);
return;
}
}
m_preferredHanScript = USCRIPT_COMMON;
m_preferredHanSkFontMgrLocale = nullptr;
}
} // namespace blink
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