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#pragma once
#include <yql/essentials/core/yql_graph_transformer.h>
#include <yql/essentials/core/expr_nodes/yql_expr_nodes.h>
#include <yql/essentials/ast/yql_expr.h>
#include <util/generic/hash.h>
#include <util/generic/strbuf.h>
#include <functional>
#include <initializer_list>
namespace NYql {
class TVisitorTransformerBase: public TSyncTransformerBase {
public:
using THandler = std::function<TStatus(const TExprNode::TPtr&, TExprNode::TPtr&, TExprContext&)>;
TVisitorTransformerBase(bool failOnUnknown)
: FailOnUnknown(failOnUnknown)
{
}
TStatus DoTransform(TExprNode::TPtr input, TExprNode::TPtr& output, TExprContext& ctx) final;
void Rewind() final {
}
bool CanParse(const TExprNode& node) const {
return Handlers.contains(node.Content());
}
protected:
void AddHandler(std::initializer_list<TStringBuf> names, THandler handler);
template <class TDerived>
THandler Hndl(TStatus(TDerived::* handler)(const TExprNode::TPtr&, TExprNode::TPtr&, TExprContext&)) {
return [this, handler] (TExprNode::TPtr input, TExprNode::TPtr& output, TExprContext& ctx) {
return (static_cast<TDerived*>(this)->*handler)(input, output, ctx);
};
}
template <class TDerived>
THandler Hndl(TStatus(TDerived::* handler)(const TExprNode::TPtr&, TExprContext&)) {
return [this, handler] (TExprNode::TPtr input, TExprNode::TPtr& /*output*/, TExprContext& ctx) {
return (static_cast<TDerived*>(this)->*handler)(input, ctx);
};
}
template <class TDerived>
THandler Hndl(TStatus(TDerived::* handler)(NNodes::TExprBase, TExprContext&)) {
return [this, handler] (TExprNode::TPtr input, TExprNode::TPtr& /*output*/, TExprContext& ctx) {
return (static_cast<TDerived*>(this)->*handler)(NNodes::TExprBase(input), ctx);
};
}
THandler Hndl(TStatus(*handler)(const TExprNode::TPtr&, TExprContext&)) {
return [handler] (TExprNode::TPtr input, TExprNode::TPtr& /*output*/, TExprContext& ctx) {
return handler(input, ctx);
};
}
THandler Hndl(TStatus(*handler)(NNodes::TExprBase, TExprContext&)) {
return [handler] (TExprNode::TPtr input, TExprNode::TPtr& /*output*/, TExprContext& ctx) {
return handler(NNodes::TExprBase(input), ctx);
};
}
protected:
const bool FailOnUnknown;
THashMap<TStringBuf, THandler> Handlers;
};
} // NYql
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