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#pragma once
#include <util/generic/strbuf.h>
#include <util/system/defaults.h>
#include <library/cpp/yt/yson_string/public.h>
namespace NYT::NYson {
////////////////////////////////////////////////////////////////////////////////
//! A SAX-like interface for parsing a YSON stream.
struct IYsonConsumer
{
virtual ~IYsonConsumer() = default;
//! The current item is a string scalar (IStringNode).
/*!
* \param value A scalar value.
*/
virtual void OnStringScalar(TStringBuf value) = 0;
//! The current item is an integer scalar (IInt64Node).
/*!
* \param value A scalar value.
*/
virtual void OnInt64Scalar(i64 value) = 0;
//! The current item is an integer scalar (IUint64Node).
/*!
* \param value A scalar value.
*/
virtual void OnUint64Scalar(ui64 scalar) = 0;
//! The current item is an FP scalar (IDoubleNode).
/*!
* \param value A scalar value.
*/
virtual void OnDoubleScalar(double value) = 0;
//! The current item is an boolean scalar (IBooleanNode).
/*!
* \param value A scalar value.
*/
virtual void OnBooleanScalar(bool value) = 0;
//! The current item is an entity (IEntityNode).
virtual void OnEntity() = 0;
//! Starts a list (IListNode).
/*!
* The events describing a list are raised as follows:
* - #OnBeginList
* - For each item: #OnListItem followed by the description of the item
* - #OnEndList
*/
virtual void OnBeginList() = 0;
//! Designates a list item.
virtual void OnListItem() = 0;
//! Ends the current list.
virtual void OnEndList() = 0;
//! Starts a map (IMapNode).
/*!
* The events describing a map are raised as follows:
* - #OnBeginMap
* - For each item: #OnKeyedItem followed by the description of the item
* - #OnEndMap
*/
virtual void OnBeginMap() = 0;
//! Designates a keyed item (in map or in attributes).
/*!
* \param key Item key in the map.
*/
virtual void OnKeyedItem(TStringBuf key) = 0;
//! Ends the current map.
virtual void OnEndMap() = 0;
//! Starts attributes.
/*!
* An arbitrary node may be preceeded by attributes.
*
* The events describing attributes are raised as follows:
* - #OnBeginAttributes
* - For each item: #OnKeyedItem followed by the description of the item
* - #OnEndAttributes
*/
virtual void OnBeginAttributes() = 0;
//! Ends the current attribute list.
virtual void OnEndAttributes() = 0;
//! Inserts YSON-serialized node or fragment.
/*!
* \param yson Serialized data.
* \param type Type of data.
*/
virtual void OnRaw(TStringBuf yson, EYsonType type) = 0;
// Extension methods.
void OnRaw(const TYsonStringBuf& yson);
};
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NYson
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