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      1 /*
      2  * Copyright (C) 2007-2009 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 "CSSParser.h"
     35 #include "CSSStyleDeclaration.h"
     36 #include "CSSValue.h"
     37 #include "CSSPrimitiveValue.h"
     38 #include "EventTarget.h"
     39 
     40 #include "V8Binding.h"
     41 #include "V8Proxy.h"
     42 
     43 #include <wtf/text/StringBuilder.h>
     44 #include <wtf/text/StringConcatenate.h>
     45 #include <wtf/ASCIICType.h>
     46 #include <wtf/PassRefPtr.h>
     47 #include <wtf/RefPtr.h>
     48 #include <wtf/StdLibExtras.h>
     49 #include <wtf/Vector.h>
     50 
     51 namespace WebCore {
     52 
     53 // FIXME: Next two functions look lifted verbatim from JSCSSStyleDeclarationCustom. Please remove duplication.
     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 #ifndef NDEBUG
     63     ASSERT(*prefix);
     64     for (const char* p = prefix; *p; ++p)
     65         ASSERT(WTF::isASCIILower(*p));
     66     ASSERT(propertyName.length());
     67 #endif
     68 
     69     if (WTF::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 WTF::isASCIIUpper(propertyName[i]);
     76         if (propertyName[i] != prefix[i])
     77             return false;
     78     }
     79     return false;
     80 }
     81 
     82 class CSSPropertyInfo {
     83 public:
     84     int propID;
     85     bool hadPixelOrPosPrefix;
     86     bool wasFilter;
     87 };
     88 
     89 // When getting properties on CSSStyleDeclarations, the name used from
     90 // Javascript and the actual name of the property are not the same, so
     91 // we have to do the following translation.  The translation turns upper
     92 // case characters into lower case characters and inserts dashes to
     93 // separate words.
     94 //
     95 // Example: 'backgroundPositionY' -> 'background-position-y'
     96 //
     97 // Also, certain prefixes such as 'pos', 'css-' and 'pixel-' are stripped
     98 // and the hadPixelOrPosPrefix out parameter is used to indicate whether or
     99 // not the property name was prefixed with 'pos-' or 'pixel-'.
    100 static CSSPropertyInfo* cssPropertyInfo(v8::Handle<v8::String>v8PropertyName)
    101 {
    102     String propertyName = toWebCoreString(v8PropertyName);
    103     typedef HashMap<String, CSSPropertyInfo*> CSSPropertyInfoMap;
    104     DEFINE_STATIC_LOCAL(CSSPropertyInfoMap, map, ());
    105     CSSPropertyInfo* propInfo = map.get(propertyName);
    106     if (!propInfo) {
    107         unsigned length = propertyName.length();
    108         bool hadPixelOrPosPrefix = false;
    109         if (!length)
    110             return 0;
    111 
    112         StringBuilder builder;
    113         builder.reserveCapacity(length);
    114 
    115         unsigned i = 0;
    116 
    117         if (hasCSSPropertyNamePrefix(propertyName, "css"))
    118             i += 3;
    119         else if (hasCSSPropertyNamePrefix(propertyName, "pixel")) {
    120             i += 5;
    121             hadPixelOrPosPrefix = true;
    122         } else if (hasCSSPropertyNamePrefix(propertyName, "pos")) {
    123             i += 3;
    124             hadPixelOrPosPrefix = true;
    125         } else if (hasCSSPropertyNamePrefix(propertyName, "webkit")
    126                 || hasCSSPropertyNamePrefix(propertyName, "khtml")
    127                 || hasCSSPropertyNamePrefix(propertyName, "apple"))
    128             builder.append('-');
    129         else if (WTF::isASCIIUpper(propertyName[0]))
    130             return 0;
    131 
    132         builder.append(WTF::toASCIILower(propertyName[i++]));
    133 
    134         for (; i < length; ++i) {
    135             UChar c = propertyName[i];
    136             if (!WTF::isASCIIUpper(c))
    137                 builder.append(c);
    138             else
    139                 builder.append(makeString('-', toASCIILower(c)));
    140         }
    141 
    142         String propName = builder.toString();
    143         int propertyID = cssPropertyID(propName);
    144         if (propertyID) {
    145             propInfo = new CSSPropertyInfo();
    146             propInfo->hadPixelOrPosPrefix = hadPixelOrPosPrefix;
    147             propInfo->wasFilter = (propName == "filter");
    148             propInfo->propID = propertyID;
    149             map.add(propertyName, propInfo);
    150         }
    151     }
    152     return propInfo;
    153 }
    154 
    155 v8::Handle<v8::Value> V8CSSStyleDeclaration::namedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
    156 {
    157     INC_STATS("DOM.CSSStyleDeclaration.NamedPropertyGetter");
    158     // First look for API defined attributes on the style declaration object.
    159     if (info.Holder()->HasRealNamedCallbackProperty(name))
    160         return notHandledByInterceptor();
    161 
    162     // Search the style declaration.
    163     CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder());
    164     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
    165 
    166     // Do not handle non-property names.
    167     if (!propInfo)
    168         return notHandledByInterceptor();
    169 
    170 
    171     RefPtr<CSSValue> cssValue = imp->getPropertyCSSValue(propInfo->propID);
    172     if (cssValue) {
    173         if (propInfo->hadPixelOrPosPrefix &&
    174             cssValue->cssValueType() == CSSValue::CSS_PRIMITIVE_VALUE) {
    175             return v8::Number::New(static_cast<CSSPrimitiveValue*>(
    176                 cssValue.get())->getFloatValue(CSSPrimitiveValue::CSS_PX));
    177         }
    178         return v8StringOrNull(cssValue->cssText());
    179     }
    180 
    181     String result = imp->getPropertyValue(propInfo->propID);
    182     if (result.isNull())
    183         result = "";  // convert null to empty string.
    184 
    185     // The 'filter' attribute is made undetectable in KJS/WebKit
    186     // to avoid confusion with IE's filter extension.
    187     if (propInfo->wasFilter)
    188         return v8UndetectableString(result);
    189 
    190     return v8String(result);
    191 }
    192 
    193 v8::Handle<v8::Value> V8CSSStyleDeclaration::namedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
    194 {
    195     INC_STATS("DOM.CSSStyleDeclaration.NamedPropertySetter");
    196     CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder());
    197     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
    198     if (!propInfo)
    199         return notHandledByInterceptor();
    200 
    201     String propertyValue = toWebCoreStringWithNullCheck(value);
    202     if (propInfo->hadPixelOrPosPrefix)
    203         propertyValue.append("px");
    204 
    205     ExceptionCode ec = 0;
    206     int importantIndex = propertyValue.find("!important", 0, false);
    207     bool important = false;
    208     if (importantIndex != -1) {
    209         important = true;
    210         propertyValue = propertyValue.left(importantIndex - 1);
    211     }
    212     imp->setProperty(propInfo->propID, propertyValue, important, ec);
    213 
    214     if (ec)
    215         throwError(ec);
    216 
    217     return value;
    218 }
    219 
    220 } // namespace WebCore
    221