/* -*- 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 <stringconversiontools.hxx>

#include <rtl/math.hxx>

namespace basegfx::internal

{

        void skipSpaces(sal_Int32&      io_rPos,

                        std::u16string_view rStr,

                        const sal_Int32 nLen)

        {

            while( io_rPos < nLen &&

                    rStr[io_rPos] == ' ' )

            {

                ++io_rPos;

            }

        }

        static void skipSpacesAndCommas(sal_Int32&      io_rPos,

                                 std::u16string_view rStr,

                                 const sal_Int32 nLen)

        {

            while(io_rPos < nLen

                    && (rStr[io_rPos] == ' ' || rStr[io_rPos] == ','))

            {

                ++io_rPos;

            }

        }

        static bool getDoubleChar(double&         o_fRetval,

                           sal_Int32&      io_rPos,

                           std::u16string_view rStr)

        {

            const sal_Int64 nStrSize = rStr.size();

            sal_Unicode aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

            const sal_Int32 nStartPos = io_rPos;

            // sign

            if(aChar == '+' || aChar == '-')

            {

                aChar = rStr[++io_rPos];

            }

            // numbers before point

            while('0' <= aChar && '9' >= aChar)

            {

                io_rPos++;

                aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

            }

            // point

            if(aChar == '.')

            {

                io_rPos++;

                aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

            }

            // numbers after point

            while ('0' <= aChar && '9' >= aChar)

            {

                io_rPos++;

                aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

            }

            // 'e'

            if(aChar == 'e' || aChar == 'E')

            {

                io_rPos++;

                aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

                // sign for 'e'

                if(aChar == '+' || aChar == '-')

                {

                    io_rPos++;

                    aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

                }

                // number for 'e'

                while('0' <= aChar && '9' >= aChar)

                {

                    io_rPos++;

                    aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;

                }

            }

            const sal_Int32 nLen = io_rPos - nStartPos;

            if(nLen)

            {

                rStr = rStr.substr(nStartPos, nLen);

                rtl_math_ConversionStatus eStatus;

                o_fRetval = ::rtl::math::stringToDouble( rStr,

                                                            '.',

                                                            ',',

                                                            &eStatus );

                return ( eStatus == rtl_math_ConversionStatus_Ok );

            }

            return false;

        }

        bool importDoubleAndSpaces(double&         o_fRetval,

                                   sal_Int32&      io_rPos,

                                   std::u16string_view rStr,

                                   const sal_Int32 nLen )

        {

            if( !getDoubleChar(o_fRetval, io_rPos, rStr) )

                return false;

            skipSpacesAndCommas(io_rPos, rStr, nLen);

            return true;

        }

        bool importFlagAndSpaces(sal_Int32&      o_nRetval,

                                 sal_Int32&      io_rPos,

                                 std::u16string_view rStr,

                                 const sal_Int32 nLen)

        {

            sal_Unicode aChar( rStr[io_rPos] );

            if(aChar == '0')

            {

                o_nRetval = 0;

                ++io_rPos;

            }

            else if (aChar == '1')

            {

                o_nRetval = 1;

                ++io_rPos;

            }

            else

                return false;

            skipSpacesAndCommas(io_rPos, rStr, nLen);

            return true;

        }

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */