1/* 2 * Copyright (C) 2007-2011 Google 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 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32#include "V8CSSStyleDeclaration.h" 33 34#include "CSSPropertyNames.h" 35#include "bindings/v8/ExceptionState.h" 36#include "bindings/v8/V8Binding.h" 37#include "core/css/CSSParser.h" 38#include "core/css/CSSPrimitiveValue.h" 39#include "core/css/CSSStyleDeclaration.h" 40#include "core/css/CSSValue.h" 41#include "core/css/RuntimeCSSEnabled.h" 42#include "core/events/EventTarget.h" 43#include "wtf/ASCIICType.h" 44#include "wtf/PassRefPtr.h" 45#include "wtf/RefPtr.h" 46#include "wtf/StdLibExtras.h" 47#include "wtf/Vector.h" 48#include "wtf/text/StringBuilder.h" 49#include "wtf/text/StringConcatenate.h" 50 51using namespace WTF; 52using namespace std; 53 54namespace WebCore { 55 56// Check for a CSS prefix. 57// Passed prefix is all lowercase. 58// First character of the prefix within the property name may be upper or lowercase. 59// Other characters in the prefix within the property name must be lowercase. 60// The prefix within the property name must be followed by a capital letter. 61static bool hasCSSPropertyNamePrefix(const String& propertyName, const char* prefix) 62{ 63#ifndef NDEBUG 64 ASSERT(*prefix); 65 for (const char* p = prefix; *p; ++p) 66 ASSERT(isASCIILower(*p)); 67 ASSERT(propertyName.length()); 68#endif 69 70 if (toASCIILower(propertyName[0]) != prefix[0]) 71 return false; 72 73 unsigned length = propertyName.length(); 74 for (unsigned i = 1; i < length; ++i) { 75 if (!prefix[i]) 76 return isASCIIUpper(propertyName[i]); 77 if (propertyName[i] != prefix[i]) 78 return false; 79 } 80 return false; 81} 82 83struct CSSPropertyInfo { 84 unsigned propID: 30; // CSSPropertyID 85 unsigned nameWithDash: 1; 86 unsigned nameWithCssPrefix: 1; 87}; 88 89static inline void countCssPropertyInfoUsage(const CSSPropertyInfo& propInfo) 90{ 91 if (propInfo.nameWithDash) 92 UseCounter::count(activeDOMWindow(), UseCounter::CSSStyleDeclarationPropertyName); 93 if (propInfo.propID == CSSPropertyFloat && !propInfo.nameWithCssPrefix) 94 UseCounter::count(activeDOMWindow(), UseCounter::CSSStyleDeclarationFloatPropertyName); 95} 96 97// When getting properties on CSSStyleDeclarations, the name used from 98// Javascript and the actual name of the property are not the same, so 99// we have to do the following translation. The translation turns upper 100// case characters into lower case characters and inserts dashes to 101// separate words. 102// 103// Example: 'backgroundPositionY' -> 'background-position-y' 104// 105// Also, certain prefixes such as 'css-' are stripped. 106static CSSPropertyInfo* cssPropertyInfo(v8::Handle<v8::String> v8PropertyName) 107{ 108 String propertyName = toCoreString(v8PropertyName); 109 typedef HashMap<String, CSSPropertyInfo*> CSSPropertyInfoMap; 110 DEFINE_STATIC_LOCAL(CSSPropertyInfoMap, map, ()); 111 CSSPropertyInfo* propInfo = map.get(propertyName); 112 if (!propInfo) { 113 unsigned length = propertyName.length(); 114 if (!length) 115 return 0; 116 117 StringBuilder builder; 118 builder.reserveCapacity(length); 119 120 unsigned i = 0; 121 bool hasSeenDash = false; 122 bool hasSeenCssPrefix = false; 123 124 if (hasCSSPropertyNamePrefix(propertyName, "css")) { 125 hasSeenCssPrefix = true; 126 i += 3; 127 } else if (hasCSSPropertyNamePrefix(propertyName, "webkit")) { 128 builder.append('-'); 129 } else if (isASCIIUpper(propertyName[0])) { 130 return 0; 131 } 132 133 builder.append(toASCIILower(propertyName[i++])); 134 135 for (; i < length; ++i) { 136 UChar c = propertyName[i]; 137 if (!isASCIIUpper(c)) { 138 if (c == '-') 139 hasSeenDash = true; 140 builder.append(c); 141 } 142 else { 143 builder.append('-'); 144 builder.append(toASCIILower(c)); 145 } 146 } 147 148 String propName = builder.toString(); 149 CSSPropertyID propertyID = cssPropertyID(propName); 150 if (propertyID && RuntimeCSSEnabled::isCSSPropertyEnabled(propertyID)) { 151 propInfo = new CSSPropertyInfo(); 152 propInfo->propID = propertyID; 153 propInfo->nameWithDash = hasSeenDash; 154 propInfo->nameWithCssPrefix = hasSeenCssPrefix; 155 map.add(propertyName, propInfo); 156 } 157 } 158 return propInfo; 159} 160 161void V8CSSStyleDeclaration::namedPropertyEnumeratorCustom(const v8::PropertyCallbackInfo<v8::Array>& info) 162{ 163 typedef Vector<String, numCSSProperties - 1> PreAllocatedPropertyVector; 164 DEFINE_STATIC_LOCAL(PreAllocatedPropertyVector, propertyNames, ()); 165 static unsigned propertyNamesLength = 0; 166 167 if (propertyNames.isEmpty()) { 168 for (int id = firstCSSProperty; id <= lastCSSProperty; ++id) { 169 CSSPropertyID propertyId = static_cast<CSSPropertyID>(id); 170 if (RuntimeCSSEnabled::isCSSPropertyEnabled(propertyId)) 171 propertyNames.append(getJSPropertyName(propertyId)); 172 } 173 sort(propertyNames.begin(), propertyNames.end(), codePointCompareLessThan); 174 propertyNamesLength = propertyNames.size(); 175 } 176 177 v8::Handle<v8::Array> properties = v8::Array::New(info.GetIsolate(), propertyNamesLength); 178 for (unsigned i = 0; i < propertyNamesLength; ++i) { 179 String key = propertyNames.at(i); 180 ASSERT(!key.isNull()); 181 properties->Set(v8::Integer::New(i, info.GetIsolate()), v8String(info.GetIsolate(), key)); 182 } 183 184 v8SetReturnValue(info, properties); 185} 186 187void V8CSSStyleDeclaration::namedPropertyQueryCustom(v8::Local<v8::String> v8Name, const v8::PropertyCallbackInfo<v8::Integer>& info) 188{ 189 // NOTE: cssPropertyInfo lookups incur several mallocs. 190 // Successful lookups have the same cost the first time, but are cached. 191 if (CSSPropertyInfo* propInfo = cssPropertyInfo(v8Name)) { 192 countCssPropertyInfoUsage(*propInfo); 193 v8SetReturnValueInt(info, 0); 194 return; 195 } 196} 197 198void V8CSSStyleDeclaration::namedPropertyGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info) 199{ 200 // First look for API defined attributes on the style declaration object. 201 if (info.Holder()->HasRealNamedCallbackProperty(name)) 202 return; 203 204 // Search the style declaration. 205 CSSPropertyInfo* propInfo = cssPropertyInfo(name); 206 207 // Do not handle non-property names. 208 if (!propInfo) 209 return; 210 211 countCssPropertyInfoUsage(*propInfo); 212 CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder()); 213 RefPtr<CSSValue> cssValue = imp->getPropertyCSSValueInternal(static_cast<CSSPropertyID>(propInfo->propID)); 214 if (cssValue) { 215 v8SetReturnValueStringOrNull(info, cssValue->cssText(), info.GetIsolate()); 216 return; 217 } 218 219 String result = imp->getPropertyValueInternal(static_cast<CSSPropertyID>(propInfo->propID)); 220 if (result.isNull()) 221 result = ""; // convert null to empty string. 222 223 v8SetReturnValueString(info, result, info.GetIsolate()); 224} 225 226void V8CSSStyleDeclaration::namedPropertySetterCustom(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info) 227{ 228 CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder()); 229 CSSPropertyInfo* propInfo = cssPropertyInfo(name); 230 if (!propInfo) 231 return; 232 233 countCssPropertyInfoUsage(*propInfo); 234 V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<WithNullCheck>, propertyValue, value); 235 ExceptionState exceptionState(ExceptionState::SetterContext, getPropertyName(static_cast<CSSPropertyID>(propInfo->propID)), "CSSStyleDeclaration", info.Holder(), info.GetIsolate()); 236 imp->setPropertyInternal(static_cast<CSSPropertyID>(propInfo->propID), propertyValue, false, exceptionState); 237 238 if (exceptionState.throwIfNeeded()) 239 return; 240 241 v8SetReturnValue(info, value); 242} 243 244} // namespace WebCore 245