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/*
* Copyright (C) 2007-2011 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/core/css/css_style_declaration.h"
#include <algorithm>
#include "third_party/blink/renderer/core/css/css_primitive_value.h"
#include "third_party/blink/renderer/core/css/css_property_id_templates.h"
#include "third_party/blink/renderer/core/css/css_property_names.h"
#include "third_party/blink/renderer/core/css/css_style_declaration.h"
#include "third_party/blink/renderer/core/css/css_value.h"
#include "third_party/blink/renderer/core/css/parser/css_parser.h"
#include "third_party/blink/renderer/core/css/properties/css_property.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/ascii_ctype.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
namespace {
// 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.
bool HasCSSPropertyNamePrefix(const AtomicString& property_name,
const char* prefix) {
#if DCHECK_IS_ON()
DCHECK(*prefix);
for (const char* p = prefix; *p; ++p)
DCHECK(IsASCIILower(*p));
DCHECK(property_name.length());
#endif
if (ToASCIILower(property_name[0]) != prefix[0])
return false;
unsigned length = property_name.length();
for (unsigned i = 1; i < length; ++i) {
if (!prefix[i])
return IsASCIIUpper(property_name[i]);
if (property_name[i] != prefix[i])
return false;
}
return false;
}
CSSPropertyID ParseCSSPropertyID(const ExecutionContext* execution_context,
const AtomicString& property_name) {
unsigned length = property_name.length();
if (!length)
return CSSPropertyID::kInvalid;
StringBuilder builder;
builder.ReserveCapacity(length);
unsigned i = 0;
bool has_seen_dash = false;
if (HasCSSPropertyNamePrefix(property_name, "webkit"))
builder.Append('-');
else if (IsASCIIUpper(property_name[0]))
return CSSPropertyID::kInvalid;
bool has_seen_upper = IsASCIIUpper(property_name[i]);
builder.Append(ToASCIILower(property_name[i++]));
for (; i < length; ++i) {
UChar c = property_name[i];
if (!IsASCIIUpper(c)) {
if (c == '-')
has_seen_dash = true;
builder.Append(c);
} else {
has_seen_upper = true;
builder.Append('-');
builder.Append(ToASCIILower(c));
}
}
// Reject names containing both dashes and upper-case characters, such as
// "border-rightColor".
if (has_seen_dash && has_seen_upper)
return CSSPropertyID::kInvalid;
String prop_name = builder.ToString();
return unresolvedCSSPropertyID(execution_context, prop_name);
}
// 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.
CSSPropertyID CssPropertyInfo(const ExecutionContext* execution_context,
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 unresolved_property =
ParseCSSPropertyID(execution_context, name);
if (unresolved_property == CSSPropertyID::kVariable)
unresolved_property = CSSPropertyID::kInvalid;
map.insert(name, unresolved_property);
DCHECK(!isValidCSSPropertyID(unresolved_property) ||
CSSProperty::Get(resolveCSSPropertyID(unresolved_property))
.IsWebExposed(execution_context));
return unresolved_property;
}
} // namespace
void CSSStyleDeclaration::Trace(Visitor* visitor) const {
ExecutionContextClient::Trace(visitor);
ScriptWrappable::Trace(visitor);
}
String CSSStyleDeclaration::AnonymousNamedGetter(const AtomicString& name) {
// Search the style declaration.
CSSPropertyID unresolved_property =
CssPropertyInfo(GetExecutionContext(), name);
// Do not handle non-property names.
if (!isValidCSSPropertyID(unresolved_property))
return String();
return GetPropertyValueInternal(resolveCSSPropertyID(unresolved_property));
}
NamedPropertySetterResult CSSStyleDeclaration::AnonymousNamedSetter(
ScriptState* script_state,
const AtomicString& name,
const String& value) {
const ExecutionContext* execution_context =
ExecutionContext::From(script_state);
if (!execution_context)
return NamedPropertySetterResult::kDidNotIntercept;
CSSPropertyID unresolved_property = CssPropertyInfo(execution_context, name);
if (!isValidCSSPropertyID(unresolved_property))
return NamedPropertySetterResult::kDidNotIntercept;
// We create the ExceptionState manually due to performance issues: adding
// [RaisesException] to the IDL causes the bindings layer to expensively
// create a std::string to set the ExceptionState's |property_name| argument,
// while we can use CSSProperty::GetPropertyName() here (see bug 829408).
ExceptionState exception_state(
script_state->GetIsolate(), ExceptionState::kSetterContext,
"CSSStyleDeclaration",
CSSProperty::Get(resolveCSSPropertyID(unresolved_property))
.GetPropertyName());
SetPropertyInternal(unresolved_property, String(), value, false,
execution_context->GetSecureContextMode(),
exception_state);
if (exception_state.HadException())
return NamedPropertySetterResult::kIntercepted;
return NamedPropertySetterResult::kIntercepted;
}
NamedPropertyDeleterResult CSSStyleDeclaration::AnonymousNamedDeleter(
const AtomicString& name) {
// Pretend to be deleted since web author can define their own property with
// the same name.
return NamedPropertyDeleterResult::kDeleted;
}
void CSSStyleDeclaration::NamedPropertyEnumerator(Vector<String>& names,
ExceptionState&) {
typedef Vector<String, numCSSProperties - 1> PreAllocatedPropertyVector;
DEFINE_STATIC_LOCAL(PreAllocatedPropertyVector, property_names, ());
const ExecutionContext* execution_context = GetExecutionContext();
if (property_names.IsEmpty()) {
for (CSSPropertyID property_id : CSSPropertyIDList()) {
const CSSProperty& property_class =
CSSProperty::Get(resolveCSSPropertyID(property_id));
if (property_class.IsWebExposed(execution_context))
property_names.push_back(property_class.GetJSPropertyName());
}
for (CSSPropertyID property_id : kCSSPropertyAliasList) {
const CSSUnresolvedProperty* property_class =
CSSUnresolvedProperty::GetAliasProperty(property_id);
if (property_class->IsWebExposed(execution_context))
property_names.push_back(property_class->GetJSPropertyName());
}
std::sort(property_names.begin(), property_names.end(),
WTF::CodeUnitCompareLessThan);
}
names = property_names;
}
bool CSSStyleDeclaration::NamedPropertyQuery(const AtomicString& name,
ExceptionState&) {
return isValidCSSPropertyID(CssPropertyInfo(GetExecutionContext(), name));
}
} // namespace blink
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