stem.h

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/* Copyright (C) 2005,2007,2010,2011,2013,2014,2015,2018,2019 Olly Betts
 * Copyright (C) 2010 Evgeny Sizikov
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */
 
#ifndef XAPIAN_INCLUDED_STEM_H
#define XAPIAN_INCLUDED_STEM_H
 
#if !defined XAPIAN_IN_XAPIAN_H && !defined XAPIAN_LIB_BUILD
# error Never use <xapian/stem.h> directly; include <xapian.h> instead.
#endif
 
#include <xapian/constinfo.h>
#include <xapian/intrusive_ptr.h>
#include <xapian/visibility.h>
 
#include <string>
 
namespace Xapian {
 
class XAPIAN_VISIBILITY_DEFAULT StemImplementation
    : public Xapian::Internal::intrusive_base
{
    void operator=(const StemImplementation &);
 
    StemImplementation(const StemImplementation &);
 
  public:
    StemImplementation() { }
 
    virtual ~StemImplementation();
 
    virtual std::string operator()(const std::string & word) = 0;
 
    virtual std::string get_description() const = 0;
};
 
class XAPIAN_VISIBILITY_DEFAULT Stem {
  public:
    Xapian::Internal::intrusive_ptr<StemImplementation> internal;
 
    Stem(const Stem & o);
 
    Stem & operator=(const Stem & o);
 
#ifdef XAPIAN_MOVE_SEMANTICS
    Stem(Stem && o);
 
    Stem & operator=(Stem && o);
#endif
 
    Stem();
 
    explicit Stem(const std::string& language);
    Stem(const std::string& language, bool fallback);
    explicit Stem(StemImplementation * p);
 
    ~Stem();
 
    std::string operator()(const std::string &word) const;
 
    bool is_none() const { return !internal.get(); }
 
    std::string get_description() const;
 
    static std::string get_available_languages() {
        const struct Xapian::Internal::constinfo * info =
            Xapian::Internal::get_constinfo_();
        return std::string(info->stemmer_data, info->stemmer_name_len);
    }
};
 
}
 
#endif // XAPIAN_INCLUDED_STEM_H