stem.cc

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/* Copyright (C) 2007,2008,2010,2011,2012,2015,2018,2019 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
 */

#include <config.h>

#include <xapian/stem.h>

#include <xapian/error.h>

#include "steminternal.h"

#include "allsnowballheaders.h"
#include "keyword.h"
#include "sbl-dispatch.h"

#include <string>

using namespace std;

namespace Xapian {

Stem::Stem(const Stem & o) : internal(o.internal) { }

Stem &
Stem::operator=(const Stem & o)
{
    internal = o.internal;
    return *this;
}

Stem::Stem(Stem &&) = default;

Stem &
Stem::operator=(Stem &&) = default;

Stem::Stem() { }

static StemImplementation*
stem_internal_factory(const std::string& language, bool fallback)
{
    int l = keyword2(tab, language.data(), language.size());
    if (l >= 0) {
        switch (static_cast<sbl_code>(l)) {
            case ARABIC:
                return new InternalStemArabic;
            case ARMENIAN:
                return new InternalStemArmenian;
            case BASQUE:
                return new InternalStemBasque;
            case CATALAN:
                return new InternalStemCatalan;
            case DANISH:
                return new InternalStemDanish;
            case DUTCH:
                return new InternalStemDutch;
            case EARLYENGLISH:
                return new InternalStemEarlyenglish;
            case ENGLISH:
                return new InternalStemEnglish;
            case FINNISH:
                return new InternalStemFinnish;
            case FRENCH:
                return new InternalStemFrench;
            case GERMAN:
                return new InternalStemGerman;
            case GERMAN2:
                return new InternalStemGerman2;
            case HUNGARIAN:
                return new InternalStemHungarian;
            case INDONESIAN:
                return new InternalStemIndonesian;
            case IRISH:
                return new InternalStemIrish;
            case ITALIAN:
                return new InternalStemItalian;
            case KRAAIJ_POHLMANN:
                return new InternalStemKraaij_pohlmann;
            case LITHUANIAN:
                return new InternalStemLithuanian;
            case LOVINS:
                return new InternalStemLovins;
            case NEPALI:
                return new InternalStemNepali;
            case NORWEGIAN:
                return new InternalStemNorwegian;
            case NONE:
                return NULL;
            case PORTUGUESE:
                return new InternalStemPortuguese;
            case PORTER:
                return new InternalStemPorter;
            case RUSSIAN:
                return new InternalStemRussian;
            case ROMANIAN:
                return new InternalStemRomanian;
            case SPANISH:
                return new InternalStemSpanish;
            case SWEDISH:
                return new InternalStemSwedish;
            case TAMIL:
                return new InternalStemTamil;
            case TURKISH:
                return new InternalStemTurkish;
        }
    }
    if (fallback || language.empty())
        return NULL;
    throw Xapian::InvalidArgumentError("Language code " + language + " unknown");
}

Stem::Stem(const std::string& language)
    : internal(stem_internal_factory(language, false)) { }

Stem::Stem(const std::string& language, bool fallback)
    : internal(stem_internal_factory(language, fallback)) { }

Stem::Stem(StemImplementation * p) : internal(p) { }

Stem::~Stem() { }

string
Stem::operator()(const std::string &word) const
{
    if (!internal.get() || word.empty()) return word;
    return internal->operator()(word);
}

string
Stem::get_description() const
{
    string desc = "Xapian::Stem(";
    if (internal.get()) {
        desc += internal->get_description();
        desc += ')';
    } else {
        desc += "none)";
    }
    return desc;
}

}