LambdaNodeMapper.h

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/*
 * Souffle - A Datalog Compiler
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved
 * Licensed under the Universal Permissive License v 1.0 as shown at:
 * - https://opensource.org/licenses/UPL
 * - <souffle root>/licenses/SOUFFLE-UPL.txt
 */
 
/************************************************************************
 *
 * @file LambdaNodeMapper.h
 *
 * Defines lambda node mappers class
 *
 ***********************************************************************/
 
#pragma once
 
#include "ast/utility/NodeMapper.h"
#include <memory>
#include <utility>
 
namespace souffle::ast {
 
namespace detail {
 
/**
 * A special NodeMapper wrapping a lambda conducting node transformations.
 */
template <typename Lambda>
class LambdaNodeMapper : public NodeMapper {
    const Lambda& lambda;
 
public:
    LambdaNodeMapper(const Lambda& lambda) : lambda(lambda) {}
 
    Own<Node> operator()(Own<Node> node) const override {
        return lambda(std::move(node));
    }
};
}  // namespace detail
 
/**
 * Creates a node mapper based on a corresponding lambda expression.
 */
template <typename Lambda>
detail::LambdaNodeMapper<Lambda> makeLambdaAstMapper(const Lambda& lambda) {
    return detail::LambdaNodeMapper<Lambda>(lambda);
}
 
}  // namespace souffle::ast