chart2/source/inc/CommonFunctors.hxx

   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 #pragma once
  20
  21 #include <o3tl/any.hxx>
  22 #include <rtl/math.hxx>
  23 #include <com/sun/star/uno/Any.hxx>
  24 #include <rtl/ustring.hxx>
  25 #include "charttoolsdllapi.hxx"
  26
  27 #include <limits>
  28
  29 namespace chart::CommonFunctors
  30 {
  31
  32 /** unary function to convert any type T into a css::uno::Any.
  33
  34     <p>uno::makeAny is an inline function.  Thus is cannot be taken directly
  35     (via mem_fun_ptr)</p>
  36 */
  37 template< typename T >
  38     struct makeAny
  39 {
  40     css::uno::Any operator() ( const T & aVal )
  41     {
  42         return css::uno::Any( aVal );
  43     }
  44 };
  45
  46 /** unary function to convert css::uno::Any into a double number.
  47
  48     <p>In case no number can be generated from the Any, NaN is returned.</p>
  49 */
  50 struct OOO_DLLPUBLIC_CHARTTOOLS AnyToDouble
  51 {
  52     double operator() ( const css::uno::Any & rAny )
  53     {
  54         double fResult = std::numeric_limits<double>::quiet_NaN();
  55         rAny >>= fResult;
  56         return fResult;
  57     }
  58 };
  59
  60 /** unary function to convert css::uno::Any into an
  61     OUString.
  62 */
  63 struct OOO_DLLPUBLIC_CHARTTOOLS AnyToString
  64 {
  65     OUString operator() ( const css::uno::Any & rAny )
  66     {
  67         if( auto pDouble = o3tl::tryAccess<double>(rAny) )
  68         {
  69             if( std::isnan(*pDouble) )
  70                 return OUString();
  71             return ::rtl::math::doubleToUString(
  72                 * pDouble,
  73                 rtl_math_StringFormat_Automatic,
  74                 rtl_math_DecimalPlaces_Max, // use maximum decimal places available
  75                 '.', // decimal separator
  76                 true // remove trailing zeros
  77                 );
  78         }
  79         else if( auto s = o3tl::tryAccess<OUString>(rAny) )
  80         {
  81             return *s;
  82         }
  83
  84         return OUString();
  85     }
  86 };
  87
  88 /** unary function to convert an OUString into a double number.
  89
  90     <p>For conversion rtl::math::StringToDouble is used.</p>
  91  */
  92 struct OOO_DLLPUBLIC_CHARTTOOLS OUStringToDouble
  93 {
  94     double operator() ( std::u16string_view rStr )
  95     {
  96         rtl_math_ConversionStatus eConversionStatus;
  97         double fResult = ::rtl::math::stringToDouble( rStr, '.', ',', & eConversionStatus );
  98
  99         if( eConversionStatus != rtl_math_ConversionStatus_Ok )
 100             return std::numeric_limits<double>::quiet_NaN();
 101
 102         return fResult;
 103     }
 104 };
 105
 106 /** unary function to convert a double number into an OUString.
 107
 108     <p>For conversion rtl::math::DoubleToOUString is used.</p>
 109  */
 110 struct OOO_DLLPUBLIC_CHARTTOOLS DoubleToOUString
 111 {
 112     OUString operator() ( double fNumber )
 113     {
 114         return ::rtl::math::doubleToUString(
 115             fNumber,
 116             rtl_math_StringFormat_Automatic,
 117             rtl_math_DecimalPlaces_Max, // use maximum decimal places available
 118             '.',
 119             true
 120             );
 121     }
 122 };
 123
 124 } //  namespace chart::CommonFunctors
 125
 126 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */