basegfx/source/tools/stringconversiontools.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <stringconversiontools.hxx>
  21 #include <rtl/math.hxx>
  22
  23 namespace basegfx::internal
  24 {
  25         void skipSpaces(sal_Int32&      io_rPos,
  26                         std::u16string_view rStr,
  27                         const sal_Int32 nLen)
  28         {
  29             while( io_rPos < nLen &&
  30                     rStr[io_rPos] == ' ' )
  31             {
  32                 ++io_rPos;
  33             }
  34         }
  35
  36         static void skipSpacesAndCommas(sal_Int32&      io_rPos,
  37                                  std::u16string_view rStr,
  38                                  const sal_Int32 nLen)
  39         {
  40             while(io_rPos < nLen
  41                     && (rStr[io_rPos] == ' ' || rStr[io_rPos] == ','))
  42             {
  43                 ++io_rPos;
  44             }
  45         }
  46
  47         static bool getDoubleChar(double&         o_fRetval,
  48                            sal_Int32&      io_rPos,
  49                            std::u16string_view rStr)
  50         {
  51             const sal_Int64 nStrSize = rStr.size();
  52             sal_Unicode aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  53             const sal_Int32 nStartPos = io_rPos;
  54
  55             // sign
  56             if(aChar == '+' || aChar == '-')
  57             {
  58                 aChar = rStr[++io_rPos];
  59             }
  60
  61             // numbers before point
  62             while('0' <= aChar && '9' >= aChar)
  63             {
  64                 io_rPos++;
  65                 aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  66             }
  67
  68             // point
  69             if(aChar == '.')
  70             {
  71                 io_rPos++;
  72                 aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  73             }
  74
  75             // numbers after point
  76             while ('0' <= aChar && '9' >= aChar)
  77             {
  78                 io_rPos++;
  79                 aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  80             }
  81
  82             // 'e'
  83             if(aChar == 'e' || aChar == 'E')
  84             {
  85                 io_rPos++;
  86                 aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  87
  88                 // sign for 'e'
  89                 if(aChar == '+' || aChar == '-')
  90                 {
  91                     io_rPos++;
  92                     aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
  93                 }
  94
  95                 // number for 'e'
  96                 while('0' <= aChar && '9' >= aChar)
  97                 {
  98                     io_rPos++;
  99                     aChar = io_rPos < nStrSize ? rStr[io_rPos] : 0;
 100                 }
 101             }
 102
 103             const sal_Int32 nLen = io_rPos - nStartPos;
 104             if(nLen)
 105             {
 106                 rStr = rStr.substr(nStartPos, nLen);
 107                 rtl_math_ConversionStatus eStatus;
 108                 o_fRetval = ::rtl::math::stringToDouble( rStr,
 109                                                             '.',
 110                                                             ',',
 111                                                             &eStatus );
 112                 return ( eStatus == rtl_math_ConversionStatus_Ok );
 113             }
 114
 115             return false;
 116         }
 117
 118         bool importDoubleAndSpaces(double&         o_fRetval,
 119                                    sal_Int32&      io_rPos,
 120                                    std::u16string_view rStr,
 121                                    const sal_Int32 nLen )
 122         {
 123             if( !getDoubleChar(o_fRetval, io_rPos, rStr) )
 124                 return false;
 125
 126             skipSpacesAndCommas(io_rPos, rStr, nLen);
 127
 128             return true;
 129         }
 130
 131         bool importFlagAndSpaces(sal_Int32&      o_nRetval,
 132                                  sal_Int32&      io_rPos,
 133                                  std::u16string_view rStr,
 134                                  const sal_Int32 nLen)
 135         {
 136             sal_Unicode aChar( rStr[io_rPos] );
 137
 138             if(aChar == '0')
 139             {
 140                 o_nRetval = 0;
 141                 ++io_rPos;
 142             }
 143             else if (aChar == '1')
 144             {
 145                 o_nRetval = 1;
 146                 ++io_rPos;
 147             }
 148             else
 149                 return false;
 150
 151             skipSpacesAndCommas(io_rPos, rStr, nLen);
 152
 153             return true;
 154         }
 155
 156 }
 157
 158 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */