File: LayoutLocale.h

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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.

#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& getSystem();
  static const LayoutLocale& valueOrDefault(const LayoutLocale* locale) {
    return locale ? *locale : getDefault();
  }

  bool operator==(const LayoutLocale& other) const {
    return m_string == other.m_string;
  }
  bool operator!=(const LayoutLocale& other) const {
    return m_string != other.m_string;
  }

  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 char* localeForSkFontMgr() const;
  UScriptCode script() const { return m_script; }

  // Disambiguation of the Unified Han Ideographs.
  UScriptCode scriptForHan() const;
  bool hasScriptForHan() const;
  static const LayoutLocale* localeForHan(const LayoutLocale*);
  static void invalidateLocaleForHan() { s_defaultForHanComputed = false; }
  const char* localeForHanForSkFontMgr() const;

  Hyphenation* getHyphenation() const;

  static PassRefPtr<LayoutLocale> createForTesting(const AtomicString&);
  static void clearForTesting();
  static void setHyphenationForTesting(const AtomicString&,
                                       PassRefPtr<Hyphenation>);

 private:
  explicit LayoutLocale(const AtomicString&);

  void computeScriptForHan() const;
  static void computeLocaleForHan();

  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_hasScriptForHan : 1;
  mutable unsigned m_hyphenationComputed : 1;

  static const LayoutLocale* s_default;
  static const LayoutLocale* s_system;
  static const LayoutLocale* s_defaultForHan;
  static bool s_defaultForHanComputed;
};

}  // namespace blink

#endif  // LayoutLocale_h