1/*
2 * Copyright (C) 2012 Motorola Mobility Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above
11 *    copyright notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Motorola Mobility Inc. nor the names of its
14 *    contributors may be used to endorse or promote products derived from this
15 *    software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "config.h"
31#include "core/css/DOMWindowCSS.h"
32
33#include "core/css/CSSPropertyMetadata.h"
34#include "core/css/StylePropertySet.h"
35#include "core/css/parser/CSSParser.h"
36#include "wtf/text/WTFString.h"
37
38namespace blink {
39
40PassRefPtrWillBeRawPtr<DOMWindowCSS> DOMWindowCSS::create()
41{
42    return adoptRefWillBeNoop(new DOMWindowCSS());
43}
44
45static String valueWithoutImportant(const String& value)
46{
47    if (!value.endsWith("important", false))
48        return value;
49
50    String newValue = value;
51    int bangIndex = newValue.length() - 9 - 1;
52    if (newValue[bangIndex] == ' ')
53        bangIndex--;
54    newValue = newValue.left(bangIndex);
55
56    return newValue;
57}
58
59bool DOMWindowCSS::supports(const String& property, const String& value) const
60{
61    CSSPropertyID propertyID = cssPropertyID(property.stripWhiteSpace());
62    if (propertyID == CSSPropertyInvalid)
63        return false;
64    ASSERT(CSSPropertyMetadata::isEnabledProperty(propertyID));
65
66    // CSSParser::parseValue() won't work correctly if !important is present,
67    // so just get rid of it. It doesn't matter to supports() if it's actually
68    // there or not, provided how it's specified in the value is correct.
69    String normalizedValue = value.stripWhiteSpace().simplifyWhiteSpace();
70    normalizedValue = valueWithoutImportant(normalizedValue);
71
72    if (normalizedValue.isEmpty())
73        return false;
74
75    RefPtrWillBeRawPtr<MutableStylePropertySet> dummyStyle = MutableStylePropertySet::create();
76    return CSSParser::parseValue(dummyStyle.get(), propertyID, normalizedValue, false, HTMLStandardMode, 0);
77}
78
79bool DOMWindowCSS::supports(const String& conditionText) const
80{
81    return CSSParser::parseSupportsCondition(conditionText);
82}
83
84}
85