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