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#include "tree_builder.h"
#include "attribute_consumer.h"
#include "helpers.h"
#include "attributes.h"
#include "attribute_consumer.h"
#include "node.h"
#include <yt/yt/core/actions/bind.h>
#include <yt/yt/core/yson/forwarding_consumer.h>
#include <library/cpp/yt/assert/assert.h>
#include <stack>
namespace NYT::NYTree {
////////////////////////////////////////////////////////////////////////////////
class TTreeBuilder
: public NYson::TForwardingYsonConsumer
, public ITreeBuilder
{
public:
explicit TTreeBuilder(INodeFactory* factory)
: Factory_(factory)
{
YT_ASSERT(Factory_);
}
void BeginTree() override
{
YT_VERIFY(NodeStack_.size() == 0);
}
INodePtr EndTree() override
{
// Failure here means that the tree is not fully constructed yet.
YT_VERIFY(NodeStack_.size() == 0);
YT_VERIFY(ResultNode_);
return ResultNode_;
}
void OnNode(INodePtr node) override
{
AddNode(node, false);
}
void OnMyStringScalar(TStringBuf value) override
{
auto node = Factory_->CreateString();
node->SetValue(TString(value));
AddNode(node, false);
}
void OnMyInt64Scalar(i64 value) override
{
auto node = Factory_->CreateInt64();
node->SetValue(value);
AddNode(node, false);
}
void OnMyUint64Scalar(ui64 value) override
{
auto node = Factory_->CreateUint64();
node->SetValue(value);
AddNode(node, false);
}
void OnMyDoubleScalar(double value) override
{
auto node = Factory_->CreateDouble();
node->SetValue(value);
AddNode(node, false);
}
void OnMyBooleanScalar(bool value) override
{
auto node = Factory_->CreateBoolean();
node->SetValue(value);
AddNode(node, false);
}
void OnMyEntity() override
{
AddNode(Factory_->CreateEntity(), false);
}
void OnMyBeginList() override
{
AddNode(Factory_->CreateList(), true);
}
void OnMyListItem() override
{
YT_ASSERT(!Key_);
}
void OnMyEndList() override
{
NodeStack_.pop();
}
void OnMyBeginMap() override
{
AddNode(Factory_->CreateMap(), true);
}
void OnMyKeyedItem(TStringBuf key) override
{
Key_ = TString(key);
}
void OnMyEndMap() override
{
NodeStack_.pop();
}
void OnMyBeginAttributes() override
{
YT_ASSERT(!AttributeConsumer_);
Attributes_ = CreateEphemeralAttributes();
AttributeConsumer_ = std::make_unique<TAttributeConsumer>(Attributes_.Get());
Forward(AttributeConsumer_.get(), nullptr, NYson::EYsonType::MapFragment);
}
void OnMyEndAttributes() override
{
AttributeConsumer_.reset();
YT_ASSERT(Attributes_);
}
private:
INodeFactory* const Factory_;
//! Contains nodes forming the current path in the tree.
std::stack<INodePtr> NodeStack_;
std::optional<TString> Key_;
INodePtr ResultNode_;
std::unique_ptr<TAttributeConsumer> AttributeConsumer_;
IAttributeDictionaryPtr Attributes_;
void AddNode(INodePtr node, bool push)
{
if (Attributes_) {
node->MutableAttributes()->MergeFrom(*Attributes_);
Attributes_ = nullptr;
}
if (NodeStack_.empty()) {
ResultNode_ = node;
} else {
auto collectionNode = NodeStack_.top();
if (Key_) {
if (!collectionNode->AsMap()->AddChild(*Key_, node)) {
THROW_ERROR_EXCEPTION("Duplicate key %Qv", *Key_);
}
Key_.reset();
} else {
collectionNode->AsList()->AddChild(node);
}
}
if (push) {
NodeStack_.push(node);
}
}
};
std::unique_ptr<ITreeBuilder> CreateBuilderFromFactory(INodeFactory* factory)
{
return std::unique_ptr<ITreeBuilder>(new TTreeBuilder(std::move(factory)));
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NYTree
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