1/*
2 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21#ifndef Pair_h
22#define Pair_h
23
24#include <wtf/RefCounted.h>
25#include "CSSPrimitiveValue.h"
26#include <wtf/PassRefPtr.h>
27#include <wtf/text/StringBuilder.h>
28
29namespace WebCore {
30
31// A primitive value representing a pair.  This is useful for properties like border-radius, background-size/position,
32// and border-spacing (all of which are space-separated sets of two values).  At the moment we are only using it for
33// border-radius and background-size, but (FIXME) border-spacing and background-position could be converted over to use
34// it (eliminating some extra -webkit- internal properties).
35class Pair : public RefCounted<Pair> {
36public:
37    static PassRefPtr<Pair> create()
38    {
39        return adoptRef(new Pair);
40    }
41    static PassRefPtr<Pair> create(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
42    {
43        return adoptRef(new Pair(first, second));
44    }
45    virtual ~Pair() { }
46
47    CSSPrimitiveValue* first() const { return m_first.get(); }
48    CSSPrimitiveValue* second() const { return m_second.get(); }
49
50    void setFirst(PassRefPtr<CSSPrimitiveValue> first) { m_first = first; }
51    void setSecond(PassRefPtr<CSSPrimitiveValue> second) { m_second = second; }
52
53    String cssText() const
54    {
55
56        return generateCSSString(first()->cssText(), second()->cssText());
57    }
58
59    bool equals(const Pair& other) const { return compareCSSValuePtr(m_first, other.m_first) && compareCSSValuePtr(m_second, other.m_second); }
60
61#if ENABLE(CSS_VARIABLES)
62    String serializeResolvingVariables(const HashMap<AtomicString, String>& variables) const
63    {
64        return generateCSSString(first()->customSerializeResolvingVariables(variables),
65                                 second()->customSerializeResolvingVariables(variables));
66    }
67
68    bool hasVariableReference() const { return first()->hasVariableReference() || second()->hasVariableReference(); }
69#endif
70
71private:
72    Pair() : m_first(0), m_second(0) { }
73    Pair(PassRefPtr<CSSPrimitiveValue> first, PassRefPtr<CSSPrimitiveValue> second)
74        : m_first(first), m_second(second) { }
75
76    static String generateCSSString(const String& first, const String& second)
77    {
78        if (first == second)
79            return first;
80        return first + ' ' + second;
81    }
82
83    RefPtr<CSSPrimitiveValue> m_first;
84    RefPtr<CSSPrimitiveValue> m_second;
85};
86
87} // namespace
88
89#endif
90