Null.h

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/*
 * Souffle - A Datalog Compiler
 * Copyright (c) 2015, 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 Null.h
 *
 * Defines the interface for Null transformation passes.
 *
 ***********************************************************************/
 
#pragma once
 
#include "ast/TranslationUnit.h"
#include "ast/transform/Meta.h"
#include "ast/transform/Transformer.h"
#include <set>
#include <string>
#include <vector>
 
namespace souffle::ast::transform {
 
/**
 * Transformer that does absolutely nothing
 */
class NullTransformer : public MetaTransformer {
private:
    bool transform(TranslationUnit& /* translationUnit */) override {
        return false;
    }
 
public:
    std::vector<Transformer*> getSubtransformers() const override {
        return {};
    }
 
    void setDebugReport() override {}
 
    void setVerbosity(bool /* verbose */) override {}
 
    void disableTransformers(const std::set<std::string>& /* transforms */) override {}
 
    std::string getName() const override {
        return "NullTransformer";
    }
 
    NullTransformer* clone() const override {
        return new NullTransformer();
    }
};
 
}  // namespace souffle::ast::transform