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      1 /*
      2  * CSS Media Query
      3  *
      4  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen (at) 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/MediaFeatureNames.h"
     34 #include "core/css/CSSPrimitiveValue.h"
     35 #include "core/css/CSSValue.h"
     36 #include "wtf/PassOwnPtr.h"
     37 #include "wtf/RefPtr.h"
     38 
     39 namespace blink {
     40 class CSSParserValueList;
     41 
     42 struct MediaQueryExpValue {
     43     CSSValueID id;
     44     double value;
     45     CSSPrimitiveValue::UnitType unit;
     46     unsigned numerator;
     47     unsigned denominator;
     48 
     49     bool isID;
     50     bool isValue;
     51     bool isRatio;
     52 
     53     MediaQueryExpValue()
     54         : id(CSSValueInvalid)
     55         , value(0)
     56         , unit(CSSPrimitiveValue::CSS_UNKNOWN)
     57         , numerator(0)
     58         , denominator(1)
     59         , isID(false)
     60         , isValue(false)
     61         , isRatio(false)
     62     {
     63     }
     64 
     65     bool isValid() const { return (isID || isValue || isRatio); }
     66     String cssText() const;
     67     bool equals(const MediaQueryExpValue& expValue) const
     68     {
     69         if (isID)
     70             return (id == expValue.id);
     71         if (isValue)
     72             return (value == expValue.value);
     73         if (isRatio)
     74             return (numerator == expValue.numerator && denominator == expValue.denominator);
     75         return !expValue.isValid();
     76     }
     77 };
     78 
     79 class MediaQueryExp  : public NoBaseWillBeGarbageCollectedFinalized<MediaQueryExp> {
     80     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     81 public:
     82     static PassOwnPtrWillBeRawPtr<MediaQueryExp> createIfValid(const String& mediaFeature, CSSParserValueList*);
     83     ~MediaQueryExp();
     84 
     85     const String& mediaFeature() const { return m_mediaFeature; }
     86 
     87     MediaQueryExpValue expValue() const { return m_expValue; }
     88 
     89     bool operator==(const MediaQueryExp& other) const;
     90 
     91     bool isViewportDependent() const;
     92 
     93     String serialize() const;
     94 
     95     PassOwnPtrWillBeRawPtr<MediaQueryExp> copy() const { return adoptPtrWillBeNoop(new MediaQueryExp(*this)); }
     96 
     97     MediaQueryExp(const MediaQueryExp& other);
     98 
     99     void trace(Visitor* visitor) { }
    100 
    101 private:
    102     MediaQueryExp(const String&, const MediaQueryExpValue&);
    103 
    104     String m_mediaFeature;
    105     MediaQueryExpValue m_expValue;
    106 };
    107 
    108 } // namespace
    109 
    110 #endif
    111