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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/css/cascade_layer.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
CascadeLayer* CascadeLayer::FindDirectSubLayer(const AtomicString& name) const {
// Anonymous layers are all distinct.
if (name == g_empty_atom) {
return nullptr;
}
for (const auto& sub_layer : direct_sub_layers_) {
if (sub_layer->GetName() == name) {
return sub_layer.Get();
}
}
return nullptr;
}
CascadeLayer* CascadeLayer::GetOrAddSubLayer(
const StyleRuleBase::LayerName& name) {
CascadeLayer* layer = this;
for (const AtomicString& name_part : name) {
CascadeLayer* direct_sub_layer = layer->FindDirectSubLayer(name_part);
if (!direct_sub_layer) {
direct_sub_layer = MakeGarbageCollected<CascadeLayer>(name_part);
layer->direct_sub_layers_.push_back(direct_sub_layer);
}
layer = direct_sub_layer;
}
return layer;
}
String CascadeLayer::ToStringForTesting() const {
StringBuilder result;
ToStringInternal(result, "");
return result.ReleaseString();
}
void CascadeLayer::ToStringInternal(StringBuilder& result,
const String& prefix) const {
for (const auto& sub_layer : direct_sub_layers_) {
String name =
sub_layer->name_.length() ? sub_layer->name_ : String("(anonymous)");
if (result.length()) {
result.Append(",");
}
result.Append(prefix);
result.Append(name);
sub_layer->ToStringInternal(result, StrCat({prefix, name, "."}));
}
}
void CascadeLayer::Merge(const CascadeLayer& other, LayerMap& mapping) {
mapping.insert(&other, this);
for (CascadeLayer* sub_layer : other.direct_sub_layers_) {
GetOrAddSubLayer({sub_layer->GetName()})->Merge(*sub_layer, mapping);
}
}
void CascadeLayer::Trace(blink::Visitor* visitor) const {
visitor->Trace(direct_sub_layers_);
}
} // namespace blink
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