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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/strbuf.h>
#include <util/generic/hash.h>
#include <functional>
#include <initializer_list>
namespace NYql {
class TExecTransformerBase : public TAsyncCallbackTransformer<TExecTransformerBase> {
public:
using TStatusCallbackPair = std::pair<TStatus, TAsyncTransformCallbackFuture>;
using TPrerequisite = std::function<TStatus(const TExprNode::TPtr&)>;
using THandler = std::function<TStatusCallbackPair(const TExprNode::TPtr&, TExprNode::TPtr&, TExprContext&)>;
TStatusCallbackPair CallbackTransform(const TExprNode::TPtr& input, TExprNode::TPtr& output, TExprContext& ctx);
bool CanExec(const TExprNode& node) const {
return Handlers.contains(node.Content());
}
protected:
void AddHandler(std::initializer_list<TStringBuf> names, TPrerequisite prerequisite, THandler handler);
static TPrerequisite RequireAll();
static TPrerequisite RequireNone();
static TPrerequisite RequireFirst();
static TPrerequisite RequireAllOf(std::initializer_list<size_t> children);
static TPrerequisite RequireSequenceOf(std::initializer_list<size_t> children);
template <class TDerived>
TPrerequisite Require(TStatus(TDerived::* prerequisite)(const TExprNode::TPtr&)) {
return [this, prerequisite] (const TExprNode::TPtr& input) {
return (static_cast<TDerived*>(this)->*prerequisite)(input);
};
}
static TStatusCallbackPair ExecPass(const TExprNode::TPtr& input, TExprContext& ctx);
static THandler Pass();
template <class TDerived>
THandler Hndl(TStatusCallbackPair(TDerived::* handler)(const TExprNode::TPtr&, TExprNode::TPtr&, TExprContext&)) {
return [this, handler] (const TExprNode::TPtr& input, TExprNode::TPtr& output, TExprContext& ctx) {
return (static_cast<TDerived*>(this)->*handler)(input, output, ctx);
};
}
template <class TDerived>
THandler Hndl(TStatusCallbackPair(TDerived::* handler)(const TExprNode::TPtr&, TExprContext&)) {
return [this, handler] (const TExprNode::TPtr& input, TExprNode::TPtr& /*output*/, TExprContext& ctx) {
return (static_cast<TDerived*>(this)->*handler)(input, ctx);
};
}
protected:
struct THandlerInfo {
TPrerequisite Prerequisite;
THandler Handler;
};
THashMap<TStringBuf, THandlerInfo> Handlers;
};
} // NYql
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