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#include "skiff.h"
#include "skiff_validator.h"
#include <vector>
#include <stack>
namespace NSkiff {
////////////////////////////////////////////////////////////////////////////////
struct IValidatorNode;
using TValidatorNodeList = std::vector<std::shared_ptr<IValidatorNode>>;
using TSkiffSchemaList = std::vector<std::shared_ptr<TSkiffSchema>>;
static std::shared_ptr<IValidatorNode> CreateUsageValidatorNode(const std::shared_ptr<TSkiffSchema>& skiffSchema);
static TValidatorNodeList CreateUsageValidatorNodeList(const TSkiffSchemaList& skiffSchemaList);
////////////////////////////////////////////////////////////////////////////////
template <typename T>
inline void ThrowUnexpectedParseWrite(T wireType)
{
ythrow TSkiffException() << "Unexpected parse/write of \"" << ::ToString(wireType) << "\" token";
}
////////////////////////////////////////////////////////////////////////////////
struct IValidatorNode
{
virtual ~IValidatorNode() = default;
virtual void OnBegin(TValidatorNodeStack* /*validatorNodeStack*/)
{ }
virtual void OnChildDone(TValidatorNodeStack* /*validatorNodeStack*/)
{
Y_FAIL();
}
virtual void OnSimpleType(TValidatorNodeStack* /*validatorNodeStack*/, EWireType wireType)
{
ThrowUnexpectedParseWrite(wireType);
}
virtual void BeforeVariant8Tag()
{
ThrowUnexpectedParseWrite(EWireType::Variant8);
}
virtual void OnVariant8Tag(TValidatorNodeStack* /*validatorNodeStack*/, ui8 /*tag*/)
{
IValidatorNode::BeforeVariant8Tag();
}
virtual void BeforeVariant16Tag()
{
ThrowUnexpectedParseWrite(EWireType::Variant16);
}
virtual void OnVariant16Tag(TValidatorNodeStack* /*validatorNodeStack*/, ui16 /*tag*/)
{
IValidatorNode::BeforeVariant16Tag();
}
};
////////////////////////////////////////////////////////////////////////////////
class TValidatorNodeStack
{
public:
explicit TValidatorNodeStack(std::shared_ptr<IValidatorNode> validator)
: RootValidator_(std::move(validator))
{ }
void PushValidator(IValidatorNode* validator)
{
ValidatorStack_.push(validator);
validator->OnBegin(this);
}
void PopValidator()
{
Y_ABORT_UNLESS(!ValidatorStack_.empty());
ValidatorStack_.pop();
if (!ValidatorStack_.empty()) {
ValidatorStack_.top()->OnChildDone(this);
}
}
void PushRootIfRequired()
{
if (ValidatorStack_.empty()) {
PushValidator(RootValidator_.get());
}
}
IValidatorNode* Top() const
{
Y_ABORT_UNLESS(!ValidatorStack_.empty());
return ValidatorStack_.top();
}
bool IsFinished() const
{
return ValidatorStack_.empty();
}
private:
const std::shared_ptr<IValidatorNode> RootValidator_;
std::stack<IValidatorNode*> ValidatorStack_;
};
////////////////////////////////////////////////////////////////////////////////
class TNothingTypeValidator
: public IValidatorNode
{
public:
void OnBegin(TValidatorNodeStack* validatorNodeStack) override
{
validatorNodeStack->PopValidator();
}
};
////////////////////////////////////////////////////////////////////////////////
class TSimpleTypeUsageValidator
: public IValidatorNode
{
public:
explicit TSimpleTypeUsageValidator(EWireType type)
: Type_(type)
{ }
void OnSimpleType(TValidatorNodeStack* validatorNodeStack, EWireType type) override
{
if (type != Type_) {
ThrowUnexpectedParseWrite(type);
}
validatorNodeStack->PopValidator();
}
private:
const EWireType Type_;
};
////////////////////////////////////////////////////////////////////////////////
template <typename TTag>
void ValidateVariantTag(TValidatorNodeStack* validatorNodeStack, TTag tag, const TValidatorNodeList& children)
{
if (tag == EndOfSequenceTag<TTag>()) {
// Root validator is pushed into the stack before variant tag
// if the stack is empty.
validatorNodeStack->PopValidator();
} else if (tag >= children.size()) {
ythrow TSkiffException() << "Variant tag \"" << tag << "\" "
<< "exceeds number of children \"" << children.size();
} else {
validatorNodeStack->PushValidator(children[tag].get());
}
}
class TVariant8TypeUsageValidator
: public IValidatorNode
{
public:
explicit TVariant8TypeUsageValidator(TValidatorNodeList children)
: Children_(std::move(children))
{ }
void BeforeVariant8Tag() override
{ }
void OnVariant8Tag(TValidatorNodeStack* validatorNodeStack, ui8 tag) override
{
ValidateVariantTag(validatorNodeStack, tag, Children_);
}
void OnChildDone(TValidatorNodeStack* validatorNodeStack) override
{
validatorNodeStack->PopValidator();
}
private:
const TValidatorNodeList Children_;
};
////////////////////////////////////////////////////////////////////////////////
class TVariant16TypeUsageValidator
: public IValidatorNode
{
public:
explicit TVariant16TypeUsageValidator(TValidatorNodeList children)
: Children_(std::move(children))
{ }
void BeforeVariant16Tag() override
{ }
void OnVariant16Tag(TValidatorNodeStack* validatorNodeStack, ui16 tag) override
{
ValidateVariantTag(validatorNodeStack, tag, Children_);
}
void OnChildDone(TValidatorNodeStack* validatorNodeStack) override
{
validatorNodeStack->PopValidator();
}
private:
const TValidatorNodeList Children_;
};
////////////////////////////////////////////////////////////////////////////////
class TRepeatedVariant8TypeUsageValidator
: public IValidatorNode
{
public:
explicit TRepeatedVariant8TypeUsageValidator(TValidatorNodeList children)
: Children_(std::move(children))
{ }
void BeforeVariant8Tag() override
{ }
void OnVariant8Tag(TValidatorNodeStack* validatorNodeStack, ui8 tag) override
{
ValidateVariantTag(validatorNodeStack, tag, Children_);
}
void OnChildDone(TValidatorNodeStack* /*validatorNodeStack*/) override
{ }
private:
const TValidatorNodeList Children_;
};
////////////////////////////////////////////////////////////////////////////////
class TRepeatedVariant16TypeUsageValidator
: public IValidatorNode
{
public:
explicit TRepeatedVariant16TypeUsageValidator(TValidatorNodeList children)
: Children_(std::move(children))
{ }
void BeforeVariant16Tag() override
{ }
void OnVariant16Tag(TValidatorNodeStack* validatorNodeStack, ui16 tag) override
{
ValidateVariantTag(validatorNodeStack, tag, Children_);
}
void OnChildDone(TValidatorNodeStack* /*validatorNodeStack*/) override
{ }
private:
const TValidatorNodeList Children_;
};
////////////////////////////////////////////////////////////////////////////////
class TTupleTypeUsageValidator
: public IValidatorNode
{
public:
explicit TTupleTypeUsageValidator(TValidatorNodeList children)
: Children_(std::move(children))
{ }
void OnBegin(TValidatorNodeStack* validatorNodeStack) override
{
Position_ = 0;
if (!Children_.empty()) {
validatorNodeStack->PushValidator(Children_[0].get());
}
}
void OnChildDone(TValidatorNodeStack* validatorNodeStack) override
{
Position_++;
if (Position_ < Children_.size()) {
validatorNodeStack->PushValidator(Children_[Position_].get());
} else {
validatorNodeStack->PopValidator();
}
}
private:
const TValidatorNodeList Children_;
ui32 Position_ = 0;
};
////////////////////////////////////////////////////////////////////////////////
TSkiffValidator::TSkiffValidator(std::shared_ptr<TSkiffSchema> skiffSchema)
: Context_(std::make_unique<TValidatorNodeStack>(CreateUsageValidatorNode(std::move(skiffSchema))))
{ }
TSkiffValidator::~TSkiffValidator()
{ }
void TSkiffValidator::BeforeVariant8Tag()
{
Context_->PushRootIfRequired();
Context_->Top()->BeforeVariant8Tag();
}
void TSkiffValidator::OnVariant8Tag(ui8 tag)
{
Context_->PushRootIfRequired();
Context_->Top()->OnVariant8Tag(Context_.get(), tag);
}
void TSkiffValidator::BeforeVariant16Tag()
{
Context_->PushRootIfRequired();
Context_->Top()->BeforeVariant16Tag();
}
void TSkiffValidator::OnVariant16Tag(ui16 tag)
{
Context_->PushRootIfRequired();
Context_->Top()->OnVariant16Tag(Context_.get(), tag);
}
void TSkiffValidator::OnSimpleType(EWireType value)
{
Context_->PushRootIfRequired();
Context_->Top()->OnSimpleType(Context_.get(), value);
}
void TSkiffValidator::ValidateFinished()
{
if (!Context_->IsFinished()) {
ythrow TSkiffException() << "Parse/write is not finished";
}
}
////////////////////////////////////////////////////////////////////////////////
TValidatorNodeList CreateUsageValidatorNodeList(const TSkiffSchemaList& skiffSchemaList)
{
TValidatorNodeList result;
result.reserve(skiffSchemaList.size());
for (const auto& skiffSchema : skiffSchemaList) {
result.push_back(CreateUsageValidatorNode(skiffSchema));
}
return result;
}
std::shared_ptr<IValidatorNode> CreateUsageValidatorNode(const std::shared_ptr<TSkiffSchema>& skiffSchema)
{
switch (skiffSchema->GetWireType()) {
case EWireType::Int8:
case EWireType::Int16:
case EWireType::Int32:
case EWireType::Int64:
case EWireType::Int128:
case EWireType::Uint8:
case EWireType::Uint16:
case EWireType::Uint32:
case EWireType::Uint64:
case EWireType::Uint128:
case EWireType::Double:
case EWireType::Boolean:
case EWireType::String32:
case EWireType::Yson32:
return std::make_shared<TSimpleTypeUsageValidator>(skiffSchema->GetWireType());
case EWireType::Nothing:
return std::make_shared<TNothingTypeValidator>();
case EWireType::Tuple:
return std::make_shared<TTupleTypeUsageValidator>(CreateUsageValidatorNodeList(skiffSchema->GetChildren()));
case EWireType::Variant8:
return std::make_shared<TVariant8TypeUsageValidator>(CreateUsageValidatorNodeList(skiffSchema->GetChildren()));
case EWireType::Variant16:
return std::make_shared<TVariant16TypeUsageValidator>(CreateUsageValidatorNodeList(skiffSchema->GetChildren()));
case EWireType::RepeatedVariant8:
return std::make_shared<TRepeatedVariant8TypeUsageValidator>(CreateUsageValidatorNodeList(skiffSchema->GetChildren()));
case EWireType::RepeatedVariant16:
return std::make_shared<TRepeatedVariant16TypeUsageValidator>(CreateUsageValidatorNodeList(skiffSchema->GetChildren()));
}
Y_FAIL();
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NSkiff
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