Add LayoutLocale class

third_party/WebKit/Source/platform/LayoutLocale.h

+// 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.
+
+#ifndef LayoutLocale_h
+#define LayoutLocale_h
+
+#include "platform/PlatformExport.h"
+#include "platform/text/Hyphenation.h"
+#include "wtf/Forward.h"
+#include "wtf/RefCounted.h"
+#include "wtf/text/AtomicString.h"
+
+#include <unicode/uscript.h>
+
+struct hb_language_impl_t;
+
+namespace blink {
+
+class Hyphenation;
+
+class PLATFORM_EXPORT LayoutLocale : public RefCounted<LayoutLocale> {
+public:
+    static const LayoutLocale* get(const AtomicString& locale);
+    static const LayoutLocale& getDefault();
+    static const LayoutLocale& valueOrDefault(const LayoutLocale* locale) { return locale ? *locale : getDefault(); }
+
+    const AtomicString& localeString() const { return m_string; }
+    static const AtomicString& localeString(const LayoutLocale* locale) { return locale ? locale->m_string : nullAtom; }
+    operator const AtomicString&() const { return m_string; }
+    CString ascii() const { return m_string.ascii(); }
+
+    const hb_language_impl_t* harfbuzzLanguage() const { return m_harfbuzzLanguage; }
+    const CString& localeForSkFontMgr() const;
+    UScriptCode script() const { return m_script; }
+    UScriptCode scriptForHan() const;
+
+    Hyphenation* getHyphenation() const;
+
+    static void clearForTesting();
+    static void setHyphenationForTesting(const AtomicString&, PassRefPtr<Hyphenation>);
+
+private:
+    explicit LayoutLocale(const AtomicString&);
+
+    AtomicString m_string;
+    mutable CString m_stringForSkFontMgr;
+    mutable RefPtr<Hyphenation> m_hyphenation;
+
+    // hb_language_t is defined in hb.h, which not all files can include.
+    const hb_language_impl_t* m_harfbuzzLanguage;
+
+    UScriptCode m_script;
+    mutable UScriptCode m_scriptForHan;
+
+    mutable unsigned m_hyphenationComputed : 1;
+
+    static const LayoutLocale* s_default;
+};
+
+} // namespace blink
+
+#endif // LayoutLocale_h