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