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// Copyright 2015 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/css_parser/border_shorthand_property_parse_structures.h"
#include "cobalt/base/polymorphic_downcast.h"
#include "cobalt/cssom/property_list_value.h"
namespace cobalt {
namespace css_parser {
void BorderShorthandToLonghand::Assign4BordersBasedOnPropertyList(
const scoped_refptr<cssom::PropertyValue>& property_list) {
DCHECK(property_list);
DCHECK(property_list->GetTypeId() ==
base::GetTypeId<cssom::PropertyListValue>());
const cssom::PropertyListValue* list =
base::polymorphic_downcast<cssom::PropertyListValue*>(
property_list.get());
switch (list->value().size()) {
case 1: {
// If right is missing, it is the same as top. A missing left is the same
// as right. A missing bottom is the same as top.
border_top = list->value()[0];
border_right = list->value()[0];
border_bottom = list->value()[0];
border_left = list->value()[0];
break;
}
case 2: {
// If left is mising, it is the same as right; If bottom is missing, it is
// the same as top.
border_top = list->value()[0];
border_right = list->value()[1];
border_bottom = list->value()[0];
border_left = list->value()[1];
break;
}
case 3: {
// A missing left is the same as right.
border_top = list->value()[0];
border_right = list->value()[1];
border_bottom = list->value()[2];
border_left = list->value()[1];
break;
}
case 4: {
border_top = list->value()[0];
border_right = list->value()[1];
border_bottom = list->value()[2];
border_left = list->value()[3];
break;
}
default:
NOTREACHED();
}
}
} // namespace css_parser
} // namespace cobalt