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      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 
     51 using namespace WTF;
     52 using namespace std;
     53 
     54 namespace 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.
     61 static 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 
     83 struct CSSPropertyInfo {
     84     unsigned propID: 30; // CSSPropertyID
     85     unsigned nameWithDash: 1;
     86     unsigned nameWithCssPrefix: 1;
     87 };
     88 
     89 static 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.
    106 static 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 
    161 void 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 
    187 void 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 
    198 void 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 
    226 void 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