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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 "bindings/core/v8/V8CSSStyleDeclaration.h"
     33 
     34 #include "bindings/core/v8/ExceptionState.h"
     35 #include "bindings/core/v8/V8Binding.h"
     36 #include "core/CSSPropertyNames.h"
     37 #include "core/css/CSSPrimitiveValue.h"
     38 #include "core/css/CSSPropertyMetadata.h"
     39 #include "core/css/CSSStyleDeclaration.h"
     40 #include "core/css/CSSValue.h"
     41 #include "core/css/parser/CSSParser.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 
     53 namespace blink {
     54 
     55 // Check for a CSS prefix.
     56 // Passed prefix is all lowercase.
     57 // First character of the prefix within the property name may be upper or lowercase.
     58 // Other characters in the prefix within the property name must be lowercase.
     59 // The prefix within the property name must be followed by a capital letter.
     60 static bool hasCSSPropertyNamePrefix(const String& propertyName, const char* prefix)
     61 {
     62 #if ENABLE(ASSERT)
     63     ASSERT(*prefix);
     64     for (const char* p = prefix; *p; ++p)
     65         ASSERT(isASCIILower(*p));
     66     ASSERT(propertyName.length());
     67 #endif
     68 
     69     if (toASCIILower(propertyName[0]) != prefix[0])
     70         return false;
     71 
     72     unsigned length = propertyName.length();
     73     for (unsigned i = 1; i < length; ++i) {
     74         if (!prefix[i])
     75             return isASCIIUpper(propertyName[i]);
     76         if (propertyName[i] != prefix[i])
     77             return false;
     78     }
     79     return false;
     80 }
     81 
     82 struct CSSPropertyInfo {
     83     CSSPropertyID propID;
     84 };
     85 
     86 static CSSPropertyID cssResolvedPropertyID(const String& propertyName)
     87 {
     88     unsigned length = propertyName.length();
     89     if (!length)
     90         return CSSPropertyInvalid;
     91 
     92     StringBuilder builder;
     93     builder.reserveCapacity(length);
     94 
     95     unsigned i = 0;
     96     bool hasSeenDash = false;
     97 
     98     if (hasCSSPropertyNamePrefix(propertyName, "css"))
     99         i += 3;
    100     else if (hasCSSPropertyNamePrefix(propertyName, "webkit"))
    101         builder.append('-');
    102     else if (isASCIIUpper(propertyName[0]))
    103         return CSSPropertyInvalid;
    104 
    105     bool hasSeenUpper = isASCIIUpper(propertyName[i]);
    106 
    107     builder.append(toASCIILower(propertyName[i++]));
    108 
    109     for (; i < length; ++i) {
    110         UChar c = propertyName[i];
    111         if (!isASCIIUpper(c)) {
    112             if (c == '-')
    113                 hasSeenDash = true;
    114             builder.append(c);
    115         } else {
    116             hasSeenUpper = true;
    117             builder.append('-');
    118             builder.append(toASCIILower(c));
    119         }
    120     }
    121 
    122     // Reject names containing both dashes and upper-case characters, such as "border-rightColor".
    123     if (hasSeenDash && hasSeenUpper)
    124         return CSSPropertyInvalid;
    125 
    126     String propName = builder.toString();
    127     return cssPropertyID(propName);
    128 }
    129 
    130 // When getting properties on CSSStyleDeclarations, the name used from
    131 // Javascript and the actual name of the property are not the same, so
    132 // we have to do the following translation. The translation turns upper
    133 // case characters into lower case characters and inserts dashes to
    134 // separate words.
    135 //
    136 // Example: 'backgroundPositionY' -> 'background-position-y'
    137 //
    138 // Also, certain prefixes such as 'css-' are stripped.
    139 static CSSPropertyInfo* cssPropertyInfo(v8::Handle<v8::String> v8PropertyName)
    140 {
    141     String propertyName = toCoreString(v8PropertyName);
    142     typedef HashMap<String, CSSPropertyInfo*> CSSPropertyInfoMap;
    143     DEFINE_STATIC_LOCAL(CSSPropertyInfoMap, map, ());
    144     CSSPropertyInfo* propInfo = map.get(propertyName);
    145     if (!propInfo) {
    146         propInfo = new CSSPropertyInfo();
    147         propInfo->propID = cssResolvedPropertyID(propertyName);
    148         map.add(propertyName, propInfo);
    149     }
    150     if (!propInfo->propID)
    151         return 0;
    152     ASSERT(CSSPropertyMetadata::isEnabledProperty(propInfo->propID));
    153     return propInfo;
    154 }
    155 
    156 void V8CSSStyleDeclaration::namedPropertyEnumeratorCustom(const v8::PropertyCallbackInfo<v8::Array>& info)
    157 {
    158     typedef Vector<String, numCSSProperties - 1> PreAllocatedPropertyVector;
    159     DEFINE_STATIC_LOCAL(PreAllocatedPropertyVector, propertyNames, ());
    160     static unsigned propertyNamesLength = 0;
    161 
    162     if (propertyNames.isEmpty()) {
    163         for (int id = firstCSSProperty; id <= lastCSSProperty; ++id) {
    164             CSSPropertyID propertyId = static_cast<CSSPropertyID>(id);
    165             if (CSSPropertyMetadata::isEnabledProperty(propertyId))
    166                 propertyNames.append(getJSPropertyName(propertyId));
    167         }
    168         std::sort(propertyNames.begin(), propertyNames.end(), codePointCompareLessThan);
    169         propertyNamesLength = propertyNames.size();
    170     }
    171 
    172     v8::Handle<v8::Array> properties = v8::Array::New(info.GetIsolate(), propertyNamesLength);
    173     for (unsigned i = 0; i < propertyNamesLength; ++i) {
    174         String key = propertyNames.at(i);
    175         ASSERT(!key.isNull());
    176         properties->Set(v8::Integer::New(info.GetIsolate(), i), v8String(info.GetIsolate(), key));
    177     }
    178 
    179     v8SetReturnValue(info, properties);
    180 }
    181 
    182 void V8CSSStyleDeclaration::namedPropertyQueryCustom(v8::Local<v8::String> v8Name, const v8::PropertyCallbackInfo<v8::Integer>& info)
    183 {
    184     // NOTE: cssPropertyInfo lookups incur several mallocs.
    185     // Successful lookups have the same cost the first time, but are cached.
    186     if (cssPropertyInfo(v8Name)) {
    187         v8SetReturnValueInt(info, 0);
    188         return;
    189     }
    190 }
    191 
    192 void V8CSSStyleDeclaration::namedPropertyGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
    193 {
    194     // First look for API defined attributes on the style declaration object.
    195     if (info.Holder()->HasRealNamedCallbackProperty(name))
    196         return;
    197 
    198     // Search the style declaration.
    199     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
    200 
    201     // Do not handle non-property names.
    202     if (!propInfo)
    203         return;
    204 
    205     CSSStyleDeclaration* impl = V8CSSStyleDeclaration::toImpl(info.Holder());
    206     RefPtrWillBeRawPtr<CSSValue> cssValue = impl->getPropertyCSSValueInternal(static_cast<CSSPropertyID>(propInfo->propID));
    207     if (cssValue) {
    208         v8SetReturnValueStringOrNull(info, cssValue->cssText(), info.GetIsolate());
    209         return;
    210     }
    211 
    212     String result = impl->getPropertyValueInternal(static_cast<CSSPropertyID>(propInfo->propID));
    213     v8SetReturnValueString(info, result, info.GetIsolate());
    214 }
    215 
    216 void V8CSSStyleDeclaration::namedPropertySetterCustom(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
    217 {
    218     CSSStyleDeclaration* impl = V8CSSStyleDeclaration::toImpl(info.Holder());
    219     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
    220     if (!propInfo)
    221         return;
    222 
    223     TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, propertyValue, value);
    224     ExceptionState exceptionState(ExceptionState::SetterContext, getPropertyName(static_cast<CSSPropertyID>(propInfo->propID)), "CSSStyleDeclaration", info.Holder(), info.GetIsolate());
    225     impl->setPropertyInternal(static_cast<CSSPropertyID>(propInfo->propID), propertyValue, false, exceptionState);
    226 
    227     if (exceptionState.throwIfNeeded())
    228         return;
    229 
    230     v8SetReturnValue(info, value);
    231 }
    232 
    233 } // namespace blink
    234