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#pragma once
#include "public.h"
#include <library/cpp/yt/memory/ref.h>
#include <variant>
namespace NYT::NYson {
////////////////////////////////////////////////////////////////////////////////
//! Contains a sequence of bytes in YSON encoding annotated with EYsonType describing
//! the content. Could be null. Non-owning.
class TYsonStringBuf
{
public:
//! Constructs a null instance.
TYsonStringBuf();
//! Constructs an instance from TYsonString.
TYsonStringBuf(const TYsonString& ysonString);
//! Constructs a non-null instance with given type and content.
explicit TYsonStringBuf(
const TString& data,
EYsonType type = EYsonType::Node);
//! Constructs a non-null instance with given type and content.
explicit TYsonStringBuf(
TStringBuf data,
EYsonType type = EYsonType::Node);
//! Constructs a non-null instance with given type and content
//! (without this overload there is no way to construct TYsonStringBuf from
//! string literal).
explicit TYsonStringBuf(
const char* data,
EYsonType type = EYsonType::Node);
//! Returns |true| if the instance is not null.
explicit operator bool() const;
//! Returns the underlying YSON bytes. The instance must be non-null.
TStringBuf AsStringBuf() const;
//! Returns type of YSON contained here. The instance must be non-null.
EYsonType GetType() const;
protected:
TStringBuf Data_;
EYsonType Type_;
bool Null_;
};
////////////////////////////////////////////////////////////////////////////////
//! An owning version of TYsonStringBuf.
/*!
* Internally captures the data either via TString or a polymorphic ref-counted holder.
*/
class TYsonString
{
public:
//! Constructs a null instance.
TYsonString();
//! Constructs an instance from TYsonStringBuf.
//! Copies the data into a ref-counted payload.
explicit TYsonString(const TYsonStringBuf& ysonStringBuf);
//! Constructs an instance from TStringBuf.
//! Copies the data into a ref-counted payload.
explicit TYsonString(
TStringBuf data,
EYsonType type = EYsonType::Node);
//! Constructs an instance from TString.
//! Zero-copy for CoW TString: retains the reference to TString in payload.
explicit TYsonString(
const TString& data,
EYsonType type = EYsonType::Node);
//! Constructs an instance from TSharedRef.
//! Zero-copy; retains the reference to TSharedRef holder in payload.
explicit TYsonString(
const TSharedRef& ref,
EYsonType type = EYsonType::Node);
//! Returns |true| if the instance is not null.
explicit operator bool() const;
//! Returns type of YSON contained here. The instance must be non-null.
EYsonType GetType() const;
//! Returns the non-owning data. The instance must be non-null.
TStringBuf AsStringBuf() const;
//! Returns the data represented by TString. The instance must be non-null.
//! Copies the data in case the payload is not TString.
TString ToString() const;
//! Returns the data represented by TSharedRef. The instance must be non-null.
//! The data is never copied.
TSharedRef ToSharedRef() const;
//! Computes the hash code.
size_t ComputeHash() const;
private:
struct TNullPayload
{ };
using THolder = TRefCountedPtr;
std::variant<TNullPayload, THolder, TString> Payload_;
const char* Begin_;
ui64 Size_ : 56;
EYsonType Type_ : 8;
};
////////////////////////////////////////////////////////////////////////////////
bool operator == (const TYsonString& lhs, const TYsonString& rhs);
bool operator == (const TYsonString& lhs, const TYsonStringBuf& rhs);
bool operator == (const TYsonStringBuf& lhs, const TYsonString& rhs);
bool operator == (const TYsonStringBuf& lhs, const TYsonStringBuf& rhs);
bool operator != (const TYsonString& lhs, const TYsonString& rhs);
bool operator != (const TYsonString& lhs, const TYsonStringBuf& rhs);
bool operator != (const TYsonStringBuf& lhs, const TYsonString& rhs);
bool operator != (const TYsonStringBuf& lhs, const TYsonStringBuf& rhs);
TString ToString(const TYsonString& yson);
TString ToString(const TYsonStringBuf& yson);
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NYson
#define STRING_INL_H_
#include "string-inl.h"
#undef STRING_INL_H_
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