ArgumentParser.cpp

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/*
 * regexpl - Console Registry Explorer
 *
 * Copyright (C) 2000-2005 Nedko Arnaudov <nedko@users.sourceforge.net>
 *
 * 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

// ArgumentParser.cpp: implementation of the CArgumentParser class.
//

#include "ph.h"
#include "ArgumentParser.h"

// Construction/Destruction

CArgumentParser::CArgumentParser()
{
    m_pchArgumentList = NULL;
    m_pchArgumentListEnd = NULL;
    m_pchArgument = NULL;
}

CArgumentParser::~CArgumentParser()
{
}

void CArgumentParser::SetArgumentList(TCHAR *pchArguments)
{
    TCHAR *pch = m_pchArgumentList = pchArguments;
    m_pchArgumentListEnd = pchArguments + _tcslen(pchArguments);

    BOOL blnLongArg = FALSE;
    while (*pch)
    {
        switch(*pch)
        {
        case _T('^'):               // argument parser ignores escape sequences
                        if (pch[1])
                            pch++;
            break;
        case _T('\"'):
                        blnLongArg = !blnLongArg;
            break;
        case _T(' '):
                    case _T('\t'):
                        case _T('\r'):
                            case _T('\n'):
                                    if (!blnLongArg)
                                        *pch = 0;
            break;
        }
        pch++;
    }

    ResetArgumentIteration();
}

TCHAR * CArgumentParser::GetNextArgument()
{
    ASSERT(m_pchArgumentList);      // call SetArgumentList() before calling this function
    ASSERT(m_pchArgumentListEnd);   // call SetArgumentList() before calling this function
    ASSERT(m_pchArgumentListEnd >= m_pchArgumentList);

    // if this is begin of iteration
    if (!m_pchArgument)
        m_pchArgument = m_pchArgumentList;

    while(m_pchArgument)
    {
        if (m_pchArgument > m_pchArgumentListEnd)
        {   // if end of arguments list reached
            ASSERT(m_pchArgument - 1 == m_pchArgumentListEnd);
            break;
        }

        TCHAR *pchArg = m_pchArgument;

        // Next argument
        m_pchArgument += _tcslen(m_pchArgument)+1;

        if(*pchArg)
        {   // if argument is not an empty string
            return pchArg;
        }
    }

    return NULL;
}

void CArgumentParser::ResetArgumentIteration()
{
    m_pchArgument = NULL;
}