/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <tools/wldcrd.hxx>

/** Tests, whether a wildcard in pWild will match for pStr.

 *

 * '*' in pWild means n chars for n > 0.

 * '?' in pWild mean match exactly one character.

 *

 */

bool WildCard::ImpMatch( std::u16string_view aWild, std::u16string_view aStr )

{

    const sal_Unicode* pPosAfterAsterisk = nullptr;

    const sal_Unicode* pWild = aWild.data();

    const sal_Unicode* pWildEnd = aWild.data() + aWild.size();

    const sal_Unicode* pStr = aStr.data();

    const sal_Unicode* pStrEnd = aStr.data() + aStr.size();

    while (pWild != pWildEnd)

    {

        switch (*pWild)

        {

            case '?':

                if ( pStr == pStrEnd )

                    return false;

                break; // Match -> proceed to the next character

            case '\\': // Escaping '?' and '*'; don't we need to escape '\\'?

                if ((pWild + 1 != pWildEnd) && ((*(pWild + 1) == '?') || (*(pWild + 1) == '*')))

                    pWild++;

                [[fallthrough]];

            default: // No wildcard, literal match

                if (pStr == pStrEnd)

                    return false;

                if (*pWild == *pStr)

                    break; // Match -> proceed to the next character

                if (!pPosAfterAsterisk)

                    return false;

                pWild = pPosAfterAsterisk;

                [[fallthrough]];

            case '*':

                while ( pWild != pWildEnd && *pWild == '*' )

                    pWild++;

                if ( pWild == pWildEnd )

                    return true;

                // Consider strange things like "**?*?*"

                while (*pWild == '?')

                {

                    if (pStr == pStrEnd)

                        return false;

                    pWild++;

                    pStr++;

                    while (pWild != pWildEnd && *pWild == '*')

                        pWild++;

                    if (pWild == pWildEnd)

                        return true;

                }

                // At this point, we are past wildcards, and a literal match must follow

                if ( pStr == pStrEnd )

                    return false;

                pPosAfterAsterisk = pWild;

                if ((*pWild == '\\') && (pWild + 1 != pWildEnd) && ((*(pWild + 1) == '?') || (*(pWild + 1) == '*')))

                    pWild++;

                while (*pStr != *pWild)

                {

                    pStr++;

                    if ( pStr == pStrEnd )

                        return false;

                }

                break; // Match -> proceed to the next character

        }

        // We arrive here when the current characters in pWild and pStr match

        assert(pWild != pWildEnd);

        pWild++;

        assert(pStr != pStrEnd);

        pStr++;

        if (pWild == pWildEnd && pPosAfterAsterisk && pStr != pStrEnd)

            pWild = pPosAfterAsterisk; // Try again on the rest of pStr

    }

    assert(pWild == pWildEnd);

    return pStr == pStrEnd;

}

bool WildCard::Matches( std::u16string_view rString ) const

{

    std::u16string_view aTmpWild = aWildString;

    size_t nSepPos;

    if ( cSepSymbol != '\0' )

    {

        while ( (nSepPos = aTmpWild.find(cSepSymbol)) != std::u16string_view::npos )

        {

            // Check all split wildcards

            if ( ImpMatch( aTmpWild.substr( 0, nSepPos ), rString ) )

                return true;

            aTmpWild = aTmpWild.substr(nSepPos + 1); // remove separator

        }

    }

    return ImpMatch( aTmpWild, rString );

}

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