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 * Copyright (c) 2015-2017, Intel Corporation
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 * modification, are permitted provided that the following conditions are met:
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 *    may be used to endorse or promote products derived from this software
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/** \file
 * \brief Corpus Generation tool.
 */

#ifndef NG_CORPUS_GENERATOR_H_
#define NG_CORPUS_GENERATOR_H_

#include "ng_corpus_properties.h"

#include <memory>
#include <string>
#include <vector>

namespace ue2 {

class ExpressionInfo;
class NGHolder;

} // namespace ue2

struct CorpusGenerationFailure {
    explicit CorpusGenerationFailure(const std::string s) :
        message(std::move(s)) {}
    std::string message;
};

/** \brief Abstract interface to corpus generator tool. */
class CorpusGenerator {
public:
    virtual ~CorpusGenerator();

    /** \brief Build some corpora.
     *
     * Generate a set of corpora, placed in the \a data vector, for the current
     * NFAGraph according to the parameters provided by the CorpusProperties
     * object. Returns the number of corpora generated.
     */
    virtual void generateCorpus(std::vector<std::string> &data) = 0;
};

/** \brief Build a concrete impl conforming to the \ref CorpusGenerator
 * interface. */
std::unique_ptr<CorpusGenerator>
makeCorpusGenerator(const ue2::NGHolder &g, const ue2::ExpressionInfo &expr,
                    CorpusProperties &props);

#endif