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 "core/css/MediaQuery.h"
31
32 #include "core/MediaTypeNames.h"
33 #include "core/css/MediaQueryExp.h"
34 #include "core/html/parser/HTMLParserIdioms.h"
35 #include "wtf/NonCopyingSort.h"
36 #include "wtf/text/StringBuilder.h"
37
38 namespace WebCore {
39
40 // http://dev.w3.org/csswg/cssom/#serialize-a-media-query
serialize() const41 String MediaQuery::serialize() const
42 {
43 StringBuilder result;
44 switch (m_restrictor) {
45 case MediaQuery::Only:
46 result.append("only ");
47 break;
48 case MediaQuery::Not:
49 result.append("not ");
50 break;
51 case MediaQuery::None:
52 break;
53 }
54
55 if (m_expressions->isEmpty()) {
56 result.append(m_mediaType);
57 return result.toString();
58 }
59
60 if (m_mediaType != MediaTypeNames::all || m_restrictor != None) {
61 result.append(m_mediaType);
62 result.append(" and ");
63 }
64
65 result.append(m_expressions->at(0)->serialize());
66 for (size_t i = 1; i < m_expressions->size(); ++i) {
67 result.append(" and ");
68 result.append(m_expressions->at(i)->serialize());
69 }
70 return result.toString();
71 }
72
expressionCompare(const OwnPtrWillBeMember<MediaQueryExp> & a,const OwnPtrWillBeMember<MediaQueryExp> & b)73 static bool expressionCompare(const OwnPtrWillBeMember<MediaQueryExp>& a, const OwnPtrWillBeMember<MediaQueryExp>& b)
74 {
75 return codePointCompare(a->serialize(), b->serialize()) < 0;
76 }
77
createNotAll()78 PassOwnPtrWillBeRawPtr<MediaQuery> MediaQuery::createNotAll()
79 {
80 return adoptPtrWillBeNoop(new MediaQuery(MediaQuery::Not, MediaTypeNames::all, nullptr));
81 }
82
MediaQuery(Restrictor r,const String & mediaType,PassOwnPtrWillBeRawPtr<ExpressionHeapVector> expressions)83 MediaQuery::MediaQuery(Restrictor r, const String& mediaType, PassOwnPtrWillBeRawPtr<ExpressionHeapVector> expressions)
84 : m_restrictor(r)
85 , m_mediaType(attemptStaticStringCreation(mediaType.lower()))
86 , m_expressions(expressions)
87 {
88 if (!m_expressions) {
89 m_expressions = adoptPtrWillBeNoop(new ExpressionHeapVector);
90 return;
91 }
92
93 nonCopyingSort(m_expressions->begin(), m_expressions->end(), expressionCompare);
94
95 // Remove all duplicated expressions.
96 MediaQueryExp* key = 0;
97 for (int i = m_expressions->size() - 1; i >= 0; --i) {
98 MediaQueryExp* exp = m_expressions->at(i).get();
99
100 if (key && *exp == *key)
101 m_expressions->remove(i);
102 else
103 key = exp;
104 }
105 }
106
MediaQuery(const MediaQuery & o)107 MediaQuery::MediaQuery(const MediaQuery& o)
108 : m_restrictor(o.m_restrictor)
109 , m_mediaType(o.m_mediaType)
110 , m_expressions(adoptPtrWillBeNoop(new ExpressionHeapVector(o.m_expressions->size())))
111 , m_serializationCache(o.m_serializationCache)
112 {
113 for (unsigned i = 0; i < m_expressions->size(); ++i)
114 (*m_expressions)[i] = o.m_expressions->at(i)->copy();
115 }
116
~MediaQuery()117 MediaQuery::~MediaQuery()
118 {
119 }
120
121 // http://dev.w3.org/csswg/cssom/#compare-media-queries
operator ==(const MediaQuery & other) const122 bool MediaQuery::operator==(const MediaQuery& other) const
123 {
124 return cssText() == other.cssText();
125 }
126
127 // http://dev.w3.org/csswg/cssom/#serialize-a-list-of-media-queries
cssText() const128 String MediaQuery::cssText() const
129 {
130 if (m_serializationCache.isNull())
131 const_cast<MediaQuery*>(this)->m_serializationCache = serialize();
132
133 return m_serializationCache;
134 }
135
trace(Visitor * visitor)136 void MediaQuery::trace(Visitor* visitor)
137 {
138 // We don't support tracing of vectors of OwnPtrs (ie. OwnPtr<Vector<OwnPtr<MediaQuery> > >).
139 // Since this is a transitional object we are just ifdef'ing it out when oilpan is not enabled.
140 #if ENABLE(OILPAN)
141 visitor->trace(m_expressions);
142 #endif
143 }
144
145 }
146