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 "DOMWindowCSS.h"
32
33#if ENABLE(CSS3_CONDITIONAL_RULES)
34
35#include "CSSParser.h"
36#include "StylePropertySet.h"
37#include <wtf/text/WTFString.h>
38
39namespace WebCore {
40
41PassRefPtr<DOMWindowCSS> DOMWindowCSS::create()
42{
43    return adoptRef(new DOMWindowCSS());
44}
45
46static String valueWithoutImportant(const String& value)
47{
48    if (!value.endsWith("important", false))
49        return value;
50
51    String newValue = value;
52    int bangIndex = newValue.length() - 9 - 1;
53    if (newValue[bangIndex] == ' ')
54        bangIndex--;
55    newValue = newValue.left(bangIndex);
56
57    return newValue;
58}
59
60bool DOMWindowCSS::supports(const String& property, const String& value) const
61{
62    CSSPropertyID propertyID = cssPropertyID(property.stripWhiteSpace());
63
64    if (propertyID == CSSPropertyInvalid)
65        return false;
66
67    // CSSParser::parseValue() won't work correctly if !important is present,
68    // so just get rid of it. It doesn't matter to supports() if it's actually
69    // there or not, provided how it's specified in the value is correct.
70    String normalizedValue = value.stripWhiteSpace().simplifyWhiteSpace();
71    normalizedValue = valueWithoutImportant(normalizedValue);
72
73    if (normalizedValue.isEmpty())
74        return false;
75
76    RefPtr<MutableStylePropertySet> dummyStyle = MutableStylePropertySet::create();
77    return CSSParser::parseValue(dummyStyle.get(), propertyID, normalizedValue, false, CSSStrictMode, 0);
78}
79
80bool DOMWindowCSS::supports(const String& conditionText) const
81{
82    CSSParserContext context(CSSStrictMode);
83    CSSParser parser(context);
84    return parser.parseSupportsCondition(conditionText);
85}
86
87}
88
89#endif
90