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 "DOMCSSNamespace.h"
32
33#include "CSSMarkup.h"
34#include "CSSParser.h"
35#include "CSSPropertyParser.h"
36#include "StyleProperties.h"
37#include <wtf/text/StringBuilder.h>
38#include <wtf/text/WTFString.h>
39
40namespace WebCore {
41
42static String valueWithoutImportant(const String& value)
43{
44 if (!value.endsWithIgnoringASCIICase("important"))
45 return value;
46
47 String newValue = value;
48 int bangIndex = newValue.length() - 9 - 1;
49 if (newValue[bangIndex] == ' ')
50 bangIndex--;
51 newValue = newValue.left(bangIndex);
52
53 return newValue;
54}
55
56bool DOMCSSNamespace::supports(Document& document, const String& property, const String& value)
57{
58 CSSPropertyID propertyID = cssPropertyID(property.stripWhiteSpace());
59
60 if (propertyID == CSSPropertyInvalid)
61 return false;
62
63 // CSSParser::parseValue() won't work correctly if !important is present,
64 // so just get rid of it. It doesn't matter to supports() if it's actually
65 // there or not, provided how it's specified in the value is correct.
66 String normalizedValue = value.stripWhiteSpace().simplifyWhiteSpace();
67 normalizedValue = valueWithoutImportant(normalizedValue);
68
69 if (normalizedValue.isEmpty())
70 return false;
71
72 auto dummyStyle = MutableStyleProperties::create();
73 return CSSParser::parseValue(dummyStyle, propertyID, normalizedValue, false, document) != CSSParser::ParseResult::Error;
74}
75
76bool DOMCSSNamespace::supports(Document& document, const String& conditionText)
77{
78 CSSParserContext context(document);
79 CSSParser parser(context);
80 return parser.parseSupportsCondition(conditionText);
81}
82
83String DOMCSSNamespace::escape(const String& ident)
84{
85 StringBuilder builder;
86 serializeIdentifier(ident, builder);
87 return builder.toString();
88}
89
90}
91