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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/LayoutLocale.h"
#include "platform/Language.h"
#include "platform/fonts/AcceptLanguagesResolver.h"
#include "platform/text/LocaleToScriptMapping.h"
#include "wtf/HashMap.h"
#include "wtf/text/AtomicStringHash.h"
#include "wtf/text/StringHash.h"
#include <hb.h>
#include <unicode/locid.h>
namespace blink {
const LayoutLocale* LayoutLocale::s_default = nullptr;
const LayoutLocale* LayoutLocale::s_system = nullptr;
const LayoutLocale* LayoutLocale::s_defaultForHan = nullptr;
bool LayoutLocale::s_defaultForHanComputed = false;
static hb_language_t toHarfbuzLanguage(const AtomicString& locale) {
CString localeAsLatin1 = locale.latin1();
return hb_language_from_string(localeAsLatin1.data(),
localeAsLatin1.length());
}
// SkFontMgr requires script-based locale names, like "zh-Hant" and "zh-Hans",
// instead of "zh-CN" and "zh-TW".
static const char* toSkFontMgrLocale(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:
return nullptr;
}
}
const char* LayoutLocale::localeForSkFontMgr() const {
if (m_stringForSkFontMgr.isNull()) {
m_stringForSkFontMgr = toSkFontMgrLocale(m_script);
if (m_stringForSkFontMgr.isNull())
m_stringForSkFontMgr = m_string.ascii();
}
return m_stringForSkFontMgr.data();
}
void LayoutLocale::computeScriptForHan() const {
if (isUnambiguousHanScript(m_script)) {
m_scriptForHan = m_script;
m_hasScriptForHan = true;
return;
}
m_scriptForHan = scriptCodeForHanFromSubtags(m_string);
if (m_scriptForHan == USCRIPT_COMMON)
m_scriptForHan = USCRIPT_SIMPLIFIED_HAN;
else
m_hasScriptForHan = true;
DCHECK(isUnambiguousHanScript(m_scriptForHan));
}
UScriptCode LayoutLocale::scriptForHan() const {
if (m_scriptForHan == USCRIPT_COMMON)
computeScriptForHan();
return m_scriptForHan;
}
bool LayoutLocale::hasScriptForHan() const {
if (m_scriptForHan == USCRIPT_COMMON)
computeScriptForHan();
return m_hasScriptForHan;
}
const LayoutLocale* LayoutLocale::localeForHan(
const LayoutLocale* contentLocale) {
if (contentLocale && contentLocale->hasScriptForHan())
return contentLocale;
if (!s_defaultForHanComputed)
computeLocaleForHan();
return s_defaultForHan;
}
void LayoutLocale::computeLocaleForHan() {
if (const LayoutLocale* locale = AcceptLanguagesResolver::localeForHan())
s_defaultForHan = locale;
else if (getDefault().hasScriptForHan())
s_defaultForHan = &getDefault();
else if (getSystem().hasScriptForHan())
s_defaultForHan = &getSystem();
else
s_defaultForHan = nullptr;
s_defaultForHanComputed = true;
}
const char* LayoutLocale::localeForHanForSkFontMgr() const {
const char* locale = toSkFontMgrLocale(scriptForHan());
DCHECK(locale);
return locale;
}
LayoutLocale::LayoutLocale(const AtomicString& locale)
: m_string(locale),
m_harfbuzzLanguage(toHarfbuzLanguage(locale)),
m_script(localeToScriptCodeForFontSelection(locale)),
m_scriptForHan(USCRIPT_COMMON),
m_hasScriptForHan(false),
m_hyphenationComputed(false) {}
using LayoutLocaleMap =
HashMap<AtomicString, RefPtr<LayoutLocale>, CaseFoldingHash>;
static LayoutLocaleMap& getLocaleMap() {
DEFINE_STATIC_LOCAL(LayoutLocaleMap, localeMap, ());
return localeMap;
}
const LayoutLocale* LayoutLocale::get(const AtomicString& locale) {
if (locale.isNull())
return nullptr;
auto result = getLocaleMap().add(locale, nullptr);
if (result.isNewEntry)
result.storedValue->value = adoptRef(new LayoutLocale(locale));
return result.storedValue->value.get();
}
const LayoutLocale& LayoutLocale::getDefault() {
if (s_default)
return *s_default;
AtomicString locale = defaultLanguage();
s_default = get(!locale.isEmpty() ? locale : "en");
return *s_default;
}
const LayoutLocale& LayoutLocale::getSystem() {
if (s_system)
return *s_system;
// Platforms such as Windows can give more information than the default
// locale, such as "en-JP" for English speakers in Japan.
String name = icu::Locale::getDefault().getName();
s_system = get(AtomicString(name.replace('_', '-')));
return *s_system;
}
PassRefPtr<LayoutLocale> LayoutLocale::createForTesting(
const AtomicString& locale) {
return adoptRef(new LayoutLocale(locale));
}
void LayoutLocale::clearForTesting() {
s_default = nullptr;
s_system = nullptr;
s_defaultForHan = nullptr;
s_defaultForHanComputed = false;
getLocaleMap().clear();
}
Hyphenation* LayoutLocale::getHyphenation() const {
if (m_hyphenationComputed)
return m_hyphenation.get();
m_hyphenationComputed = true;
m_hyphenation = Hyphenation::platformGetHyphenation(localeString());
return m_hyphenation.get();
}
void LayoutLocale::setHyphenationForTesting(
const AtomicString& localeString,
PassRefPtr<Hyphenation> hyphenation) {
const LayoutLocale& locale = valueOrDefault(get(localeString));
locale.m_hyphenationComputed = true;
locale.m_hyphenation = hyphenation;
}
} // namespace blink
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