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
36 namespace WebCore {
37
38 // http://dev.w3.org/csswg/cssom/#serialize-a-media-query
serialize() const39 String MediaQuery::serialize() const
40 {
41 StringBuilder result;
42
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 return result.toString();
70 }
71
expressionCompare(const OwnPtr<MediaQueryExp> & a,const OwnPtr<MediaQueryExp> & b)72 static bool expressionCompare(const OwnPtr<MediaQueryExp>& a, const OwnPtr<MediaQueryExp>& b)
73 {
74 return codePointCompare(a->serialize(), b->serialize()) < 0;
75 }
76
77
MediaQuery(Restrictor r,const String & mediaType,PassOwnPtr<Vector<OwnPtr<MediaQueryExp>>> exprs)78 MediaQuery::MediaQuery(Restrictor r, const String& mediaType, PassOwnPtr<Vector<OwnPtr<MediaQueryExp> > > exprs)
79 : m_restrictor(r)
80 , m_mediaType(mediaType.lower())
81 , m_expressions(exprs)
82 , m_ignored(false)
83 {
84 if (!m_expressions) {
85 m_expressions = adoptPtr(new Vector<OwnPtr<MediaQueryExp> >);
86 return;
87 }
88
89 nonCopyingSort(m_expressions->begin(), m_expressions->end(), expressionCompare);
90
91 // remove all duplicated expressions
92 String key;
93 for (int i = m_expressions->size() - 1; i >= 0; --i) {
94
95 // if not all of the expressions is valid the media query must be ignored.
96 if (!m_ignored)
97 m_ignored = !m_expressions->at(i)->isValid();
98
99 if (m_expressions->at(i)->serialize() == key)
100 m_expressions->remove(i);
101 else
102 key = m_expressions->at(i)->serialize();
103 }
104 }
105
~MediaQuery()106 MediaQuery::~MediaQuery()
107 {
108 }
109
110 // http://dev.w3.org/csswg/cssom/#compare-media-queries
operator ==(const MediaQuery & other) const111 bool MediaQuery::operator==(const MediaQuery& other) const
112 {
113 return cssText() == other.cssText();
114 }
115
116 // http://dev.w3.org/csswg/cssom/#serialize-a-list-of-media-queries
cssText() const117 String MediaQuery::cssText() const
118 {
119 if (m_serializationCache.isNull())
120 const_cast<MediaQuery*>(this)->m_serializationCache = serialize();
121
122 return m_serializationCache;
123 }
124
125 } //namespace
126