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/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
39namespace blink {
40class CSSParserValueList;
41
42struct 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
79class MediaQueryExp  : public NoBaseWillBeGarbageCollectedFinalized<MediaQueryExp> {
80    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
81public:
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
101private:
102    MediaQueryExp(const String&, const MediaQueryExpValue&);
103
104    String m_mediaFeature;
105    MediaQueryExpValue m_expValue;
106};
107
108} // namespace
109
110#endif
111