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