1/*
2 * CSS Media Query
3 *
4 * Copyright (C) 2005, 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#include "config.h"
30#include "MediaQuery.h"
31
32#include "MediaQueryExp.h"
33#include <wtf/NonCopyingSort.h>
34#include <wtf/text/StringBuilder.h>
35
36namespace WebCore {
37
38// http://dev.w3.org/csswg/cssom/#serialize-a-media-query
39String MediaQuery::serialize() const
40{
41    StringBuilder result;
42    if (!m_ignored) {
43        switch (m_restrictor) {
44        case MediaQuery::Only:
45            result.append("only ");
46            break;
47        case MediaQuery::Not:
48            result.append("not ");
49            break;
50        case MediaQuery::None:
51            break;
52        }
53
54        if (m_expressions->isEmpty()) {
55            result.append(m_mediaType);
56            return result.toString();
57        }
58
59        if (m_mediaType != "all" || m_restrictor != None) {
60            result.append(m_mediaType);
61            result.append(" and ");
62        }
63
64        result.append(m_expressions->at(0)->serialize());
65        for (size_t i = 1; i < m_expressions->size(); ++i) {
66            result.append(" and ");
67            result.append(m_expressions->at(i)->serialize());
68        }
69    } else {
70        // If query is invalid, serialized text should turn into "not all".
71        result.append("not all");
72    }
73    return result.toString();
74}
75
76static bool expressionCompare(const OwnPtr<MediaQueryExp>& a, const OwnPtr<MediaQueryExp>& b)
77{
78    return codePointCompare(a->serialize(), b->serialize()) < 0;
79}
80
81
82MediaQuery::MediaQuery(Restrictor r, const String& mediaType, PassOwnPtr<Vector<OwnPtr<MediaQueryExp> > > exprs)
83    : m_restrictor(r)
84    , m_mediaType(mediaType.lower())
85    , m_expressions(exprs)
86    , m_ignored(false)
87{
88    if (!m_expressions) {
89        m_expressions = adoptPtr(new Vector<OwnPtr<MediaQueryExp> >);
90        return;
91    }
92
93    nonCopyingSort(m_expressions->begin(), m_expressions->end(), expressionCompare);
94
95    // remove all duplicated expressions
96    String key;
97    for (int i = m_expressions->size() - 1; i >= 0; --i) {
98
99        // if not all of the expressions is valid the media query must be ignored.
100        if (!m_ignored)
101            m_ignored = !m_expressions->at(i)->isValid();
102
103        if (m_expressions->at(i)->serialize() == key)
104            m_expressions->remove(i);
105        else
106            key = m_expressions->at(i)->serialize();
107    }
108}
109
110MediaQuery::MediaQuery(const MediaQuery& o)
111    : m_restrictor(o.m_restrictor)
112    , m_mediaType(o.m_mediaType)
113    , m_expressions(adoptPtr(new Vector<OwnPtr<MediaQueryExp> >(o.m_expressions->size())))
114    , m_ignored(o.m_ignored)
115    , m_serializationCache(o.m_serializationCache)
116{
117    for (unsigned i = 0; i < m_expressions->size(); ++i)
118        (*m_expressions)[i] = o.m_expressions->at(i)->copy();
119}
120
121MediaQuery::~MediaQuery()
122{
123}
124
125// http://dev.w3.org/csswg/cssom/#compare-media-queries
126bool MediaQuery::operator==(const MediaQuery& other) const
127{
128    return cssText() == other.cssText();
129}
130
131// http://dev.w3.org/csswg/cssom/#serialize-a-list-of-media-queries
132String MediaQuery::cssText() const
133{
134    if (m_serializationCache.isNull())
135        const_cast<MediaQuery*>(this)->m_serializationCache = serialize();
136
137    return m_serializationCache;
138}
139
140} //namespace
141