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// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/cssom/css_computed_style_declaration.h"
#include "cobalt/cssom/css_declared_style_data.h"
#include "cobalt/dom/dom_exception.h"
namespace cobalt {
namespace cssom {
// This returns the result of serializing a CSS declaration block.
// https://www.w3.org/TR/cssom/#serialize-a-css-declaration-block
std::string CSSComputedStyleDeclaration::css_text(
script::ExceptionState* /*exception_state*/) const {
// The current implementation does not handle shorthands.
NOTIMPLEMENTED();
return data_ ? data_->SerializeCSSDeclarationBlock() : std::string();
}
void CSSComputedStyleDeclaration::set_css_text(
const std::string& /*css_text*/, script::ExceptionState* exception_state) {
dom::DOMException::Raise(dom::DOMException::kInvalidAccessErr,
exception_state);
}
// The length attribute must return the number of CSS declarations in the
// declarations.
// https://www.w3.org/TR/cssom/#dom-cssstyledeclaration-length
unsigned int CSSComputedStyleDeclaration::length() const {
// Computed style declarations have all known longhand properties.
return kMaxLonghandPropertyKey + 1;
}
// The item(index) method must return the property name of the CSS declaration
// at position index.
// https://www.w3.org/TR/cssom/#dom-cssstyledeclaration-item
base::Optional<std::string> CSSComputedStyleDeclaration::Item(
unsigned int index) const {
if (index >= length()) return base::nullopt;
return base::Optional<std::string>(
GetPropertyName(GetLexicographicalLonghandPropertyKey(index)));
}
std::string CSSComputedStyleDeclaration::GetDeclaredPropertyValueStringByKey(
const PropertyKey key) const {
if (!data_ || key == kNoneProperty) {
return std::string();
}
if (key > kMaxLonghandPropertyKey) {
// Shorthand properties are never directly stored as computed style
// properties.
// TODO: Implement serialization of css values, see
// https://www.w3.org/TR/cssom-1/#serializing-css-values
DCHECK_LE(key, kMaxEveryPropertyKey);
NOTIMPLEMENTED();
DLOG(WARNING) << "Unsupported property query for \"" << GetPropertyName(key)
<< "\": Returning of property value strings is not "
"supported for shorthand properties.";
return std::string();
}
const scoped_refptr<PropertyValue>& property_value =
data_->GetPropertyValueReference(key);
DCHECK(property_value);
return property_value->ToString();
}
void CSSComputedStyleDeclaration::SetPropertyValue(
const std::string& /*property_name*/, const std::string& /*property_value*/,
script::ExceptionState* exception_state) {
dom::DOMException::Raise(dom::DOMException::kInvalidAccessErr,
exception_state);
}
void CSSComputedStyleDeclaration::SetProperty(
const std::string& /*property_name*/, const std::string& /*property_value*/,
const std::string& /*priority*/, script::ExceptionState* exception_state) {
dom::DOMException::Raise(dom::DOMException::kInvalidAccessErr,
exception_state);
}
void CSSComputedStyleDeclaration::SetData(
const scoped_refptr<const CSSComputedStyleData>& data) {
data_ = data;
// After setting |data_|, |data_with_inherited_properties_| needs to be
// updated. It may have changed.
UpdateInheritedData();
}
void CSSComputedStyleDeclaration::UpdateInheritedData() {
if (!data_) {
// If there's no data, then there can be no data with inherited properties.
data_with_inherited_properties_ = NULL;
} else if (data_->has_declared_inherited_properties()) {
// Otherwise, if the data has inherited properties, then it's also the first
// data with inherited properties.
data_with_inherited_properties_ = data_;
} else {
// Otherwise, |data_with_inherited_properties_| should be set to the parent
// computed style's |data_with_inherited_properties_|. This is because the
// updates always cascade down the tree and the parent is guaranteed to
// have already been updated when the child is updated.
const scoped_refptr<CSSComputedStyleDeclaration>&
parent_computed_style_declaration =
data_->GetParentComputedStyleDeclaration();
if (parent_computed_style_declaration) {
data_with_inherited_properties_ =
parent_computed_style_declaration->data_with_inherited_properties_;
} else {
data_with_inherited_properties_ = NULL;
}
}
}
const scoped_refptr<PropertyValue>&
CSSComputedStyleDeclaration::GetInheritedPropertyValueReference(
PropertyKey key) const {
DCHECK(data_with_inherited_properties_);
return data_with_inherited_properties_->GetPropertyValueReference(key);
}
} // namespace cssom
} // namespace cobalt