third_party/WebKit/Source/core/css/MediaQueryExp.h

/*
 * CSS Media Query
 *
 * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 *
 * 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 THE AUTHOR ``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 COMPUTER, INC. OR
 * 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.
 */

#ifndef MediaQueryExp_h
#define MediaQueryExp_h

#include "core/CSSValueKeywords.h"
#include "core/CoreExport.h"
#include "core/MediaFeatureNames.h"
#include "core/css/CSSPrimitiveValue.h"
#include "core/css/CSSValue.h"
#include "wtf/Allocator.h"
#include "wtf/RefPtr.h"

namespace blink {

class CSSParserToken;

struct MediaQueryExpValue {
  DISALLOW_NEW();
  CSSValueID id;
  double value;
  CSSPrimitiveValue::UnitType unit;
  unsigned numerator;
  unsigned denominator;

  bool isID;
  bool isValue;
  bool isRatio;

  MediaQueryExpValue()
      : id(CSSValueInvalid),
        value(0),
        unit(CSSPrimitiveValue::UnitType::Unknown),
        numerator(0),
        denominator(1),
        isID(false),
        isValue(false),
        isRatio(false) {}

  bool isValid() const { return (isID || isValue || isRatio); }
  String cssText() const;
  bool equals(const MediaQueryExpValue& expValue) const {
    if (isID)
      return (id == expValue.id);
    if (isValue)
      return (value == expValue.value);
    if (isRatio)
      return (numerator == expValue.numerator &&
              denominator == expValue.denominator);
    return !expValue.isValid();
  }
};

class CORE_EXPORT MediaQueryExp
    : public GarbageCollectedFinalized<MediaQueryExp> {
 public:
  static MediaQueryExp* createIfValid(const String& mediaFeature,
                                      const Vector<CSSParserToken, 4>&);
  ~MediaQueryExp();

  const String& mediaFeature() const { return m_mediaFeature; }

  MediaQueryExpValue expValue() const { return m_expValue; }

  bool operator==(const MediaQueryExp& other) const;

  bool isViewportDependent() const;

  bool isDeviceDependent() const;

  String serialize() const;

  MediaQueryExp* copy() const { return new MediaQueryExp(*this); }

  MediaQueryExp(const MediaQueryExp& other);

  DEFINE_INLINE_TRACE() {}

 private:
  MediaQueryExp(const String&, const MediaQueryExpValue&);

  String m_mediaFeature;
  MediaQueryExpValue m_expValue;
};

}  // namespace blink

#endif