third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp

/*
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "bindings/core/v8/V8CSSStyleDeclaration.h"

#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/V8Binding.h"
#include "core/CSSPropertyNames.h"
#include "core/css/CSSPrimitiveValue.h"
#include "core/css/CSSPropertyMetadata.h"
#include "core/css/CSSStyleDeclaration.h"
#include "core/css/CSSValue.h"
#include "core/css/parser/CSSParser.h"
#include "core/dom/custom/CEReactionsScope.h"
#include "core/events/EventTarget.h"
#include "wtf/ASCIICType.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/StdLibExtras.h"
#include "wtf/Vector.h"
#include "wtf/text/StringBuilder.h"
#include "wtf/text/StringConcatenate.h"
#include <algorithm>

using namespace WTF;

namespace blink {

// Check for a CSS prefix.
// Passed prefix is all lowercase.
// First character of the prefix within the property name may be upper or
// lowercase.
// Other characters in the prefix within the property name must be lowercase.
// The prefix within the property name must be followed by a capital letter.
static bool hasCSSPropertyNamePrefix(const String& propertyName,
                                     const char* prefix) {
#if ENABLE(ASSERT)
  ASSERT(*prefix);
  for (const char* p = prefix; *p; ++p)
    ASSERT(isASCIILower(*p));
  ASSERT(propertyName.length());
#endif

  if (toASCIILower(propertyName[0]) != prefix[0])
    return false;

  unsigned length = propertyName.length();
  for (unsigned i = 1; i < length; ++i) {
    if (!prefix[i])
      return isASCIIUpper(propertyName[i]);
    if (propertyName[i] != prefix[i])
      return false;
  }
  return false;
}

static CSSPropertyID parseCSSPropertyID(const String& propertyName) {
  unsigned length = propertyName.length();
  if (!length)
    return CSSPropertyInvalid;

  StringBuilder builder;
  builder.reserveCapacity(length);

  unsigned i = 0;
  bool hasSeenDash = false;

  if (hasCSSPropertyNamePrefix(propertyName, "webkit"))
    builder.append('-');
  else if (isASCIIUpper(propertyName[0]))
    return CSSPropertyInvalid;

  bool hasSeenUpper = isASCIIUpper(propertyName[i]);

  builder.append(toASCIILower(propertyName[i++]));

  for (; i < length; ++i) {
    UChar c = propertyName[i];
    if (!isASCIIUpper(c)) {
      if (c == '-')
        hasSeenDash = true;
      builder.append(c);
    } else {
      hasSeenUpper = true;
      builder.append('-');
      builder.append(toASCIILower(c));
    }
  }

  // Reject names containing both dashes and upper-case characters, such as
  // "border-rightColor".
  if (hasSeenDash && hasSeenUpper)
    return CSSPropertyInvalid;

  String propName = builder.toString();
  return unresolvedCSSPropertyID(propName);
}

// When getting properties on CSSStyleDeclarations, the name used from
// Javascript and the actual name of the property are not the same, so
// we have to do the following translation. The translation turns upper
// case characters into lower case characters and inserts dashes to
// separate words.
//
// Example: 'backgroundPositionY' -> 'background-position-y'
//
// Also, certain prefixes such as 'css-' are stripped.
static CSSPropertyID cssPropertyInfo(const AtomicString& name) {
  typedef HashMap<String, CSSPropertyID> CSSPropertyIDMap;
  DEFINE_STATIC_LOCAL(CSSPropertyIDMap, map, ());
  CSSPropertyIDMap::iterator iter = map.find(name);
  if (iter != map.end())
    return iter->value;

  CSSPropertyID unresolvedProperty = parseCSSPropertyID(name);
  if (unresolvedProperty == CSSPropertyVariable)
    unresolvedProperty = CSSPropertyInvalid;
  map.add(name, unresolvedProperty);
  ASSERT(!unresolvedProperty ||
         CSSPropertyMetadata::isEnabledProperty(unresolvedProperty));
  return unresolvedProperty;
}

void V8CSSStyleDeclaration::namedPropertyEnumeratorCustom(
    const v8::PropertyCallbackInfo<v8::Array>& info) {
  typedef Vector<String, numCSSProperties - 1> PreAllocatedPropertyVector;
  DEFINE_STATIC_LOCAL(PreAllocatedPropertyVector, propertyNames, ());
  static unsigned propertyNamesLength = 0;

  if (propertyNames.isEmpty()) {
    for (int id = firstCSSProperty; id <= lastCSSProperty; ++id) {
      CSSPropertyID propertyId = static_cast<CSSPropertyID>(id);
      if (CSSPropertyMetadata::isEnabledProperty(propertyId))
        propertyNames.append(getJSPropertyName(propertyId));
    }
    std::sort(propertyNames.begin(), propertyNames.end(),
              codePointCompareLessThan);
    propertyNamesLength = propertyNames.size();
  }

  v8::Local<v8::Context> context = info.GetIsolate()->GetCurrentContext();
  v8::Local<v8::Array> properties =
      v8::Array::New(info.GetIsolate(), propertyNamesLength);
  for (unsigned i = 0; i < propertyNamesLength; ++i) {
    String key = propertyNames.at(i);
    ASSERT(!key.isNull());
    if (!v8CallBoolean(properties->CreateDataProperty(
            context, i, v8String(info.GetIsolate(), key))))
      return;
  }

  v8SetReturnValue(info, properties);
}

void V8CSSStyleDeclaration::namedPropertyQueryCustom(
    const AtomicString& name,
    const v8::PropertyCallbackInfo<v8::Integer>& info) {
  // NOTE: cssPropertyInfo lookups incur several mallocs.
  // Successful lookups have the same cost the first time, but are cached.
  if (cssPropertyInfo(name)) {
    v8SetReturnValueInt(info, 0);
    return;
  }
}

void V8CSSStyleDeclaration::namedPropertyGetterCustom(
    const AtomicString& name,
    const v8::PropertyCallbackInfo<v8::Value>& info) {
  // Search the style declaration.
  CSSPropertyID unresolvedProperty = cssPropertyInfo(name);

  // Do not handle non-property names.
  if (!unresolvedProperty)
    return;
  CSSPropertyID resolvedProperty = resolveCSSPropertyID(unresolvedProperty);

  CSSStyleDeclaration* impl = V8CSSStyleDeclaration::toImpl(info.Holder());
  const CSSValue* cssValue =
      impl->getPropertyCSSValueInternal(resolvedProperty);
  if (cssValue) {
    v8SetReturnValueStringOrNull(info, cssValue->cssText(), info.GetIsolate());
    return;
  }

  String result = impl->getPropertyValueInternal(resolvedProperty);
  v8SetReturnValueString(info, result, info.GetIsolate());
}

void V8CSSStyleDeclaration::namedPropertySetterCustom(
    const AtomicString& name,
    v8::Local<v8::Value> value,
    const v8::PropertyCallbackInfo<v8::Value>& info) {
  CSSStyleDeclaration* impl = V8CSSStyleDeclaration::toImpl(info.Holder());
  CSSPropertyID unresolvedProperty = cssPropertyInfo(name);
  if (!unresolvedProperty)
    return;

  CEReactionsScope ceReactionsScope;

  TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, propertyValue, value);
  ExceptionState exceptionState(
      ExceptionState::SetterContext,
      getPropertyName(resolveCSSPropertyID(unresolvedProperty)),
      "CSSStyleDeclaration", info.Holder(), info.GetIsolate());
  impl->setPropertyInternal(unresolvedProperty, String(), propertyValue, false,
                            exceptionState);

  v8SetReturnValue(info, value);
}

}  // namespace blink