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

   1 /*
   2  * CSS Media Query
   3  *
   4  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
   5  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  20  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  21  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  24  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef MediaQueryExp_h
  30 #define MediaQueryExp_h
  31
  32 #include "core/CSSValueKeywords.h"
  33 #include "core/CoreExport.h"
  34 #include "core/MediaFeatureNames.h"
  35 #include "core/css/CSSPrimitiveValue.h"
  36 #include "core/css/CSSValue.h"
  37 #include "wtf/Allocator.h"
  38 #include "wtf/PassOwnPtr.h"
  39 #include "wtf/RefPtr.h"
  40
  41 namespace blink {
  42
  43 class CSSParserToken;
  44
  45 struct MediaQueryExpValue {
  46     DISALLOW_ALLOCATION();
  47     CSSValueID id;
  48     double value;
  49     CSSPrimitiveValue::UnitType unit;
  50     unsigned numerator;
  51     unsigned denominator;
  52
  53     bool isID;
  54     bool isValue;
  55     bool isRatio;
  56
  57     MediaQueryExpValue()
  58         : id(CSSValueInvalid)
  59         , value(0)
  60         , unit(CSSPrimitiveValue::UnitType::Unknown)
  61         , numerator(0)
  62         , denominator(1)
  63         , isID(false)
  64         , isValue(false)
  65         , isRatio(false)
  66     {
  67     }
  68
  69     bool isValid() const { return (isID || isValue || isRatio); }
  70     String cssText() const;
  71     bool equals(const MediaQueryExpValue& expValue) const
  72     {
  73         if (isID)
  74             return (id == expValue.id);
  75         if (isValue)
  76             return (value == expValue.value);
  77         if (isRatio)
  78             return (numerator == expValue.numerator && denominator == expValue.denominator);
  79         return !expValue.isValid();
  80     }
  81 };
  82
  83 class CORE_EXPORT MediaQueryExp  : public NoBaseWillBeGarbageCollectedFinalized<MediaQueryExp> {
  84     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(MediaQueryExp);
  85 public:
  86     static PassOwnPtrWillBeRawPtr<MediaQueryExp> createIfValid(const String& mediaFeature, const Vector<CSSParserToken, 4>&);
  87     ~MediaQueryExp();
  88
  89     const String& mediaFeature() const { return m_mediaFeature; }
  90
  91     MediaQueryExpValue expValue() const { return m_expValue; }
  92
  93     bool operator==(const MediaQueryExp& other) const;
  94
  95     bool isViewportDependent() const;
  96
  97     String serialize() const;
  98
  99     PassOwnPtrWillBeRawPtr<MediaQueryExp> copy() const { return adoptPtrWillBeNoop(new MediaQueryExp(*this)); }
 100
 101     MediaQueryExp(const MediaQueryExp& other);
 102
 103     DEFINE_INLINE_TRACE() { }
 104
 105 private:
 106     MediaQueryExp(const String&, const MediaQueryExpValue&);
 107
 108     String m_mediaFeature;
 109     MediaQueryExpValue m_expValue;
 110 };
 111
 112 } // namespace
 113
 114 #endif