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.
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   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 <com/sun/star/uno/Sequence.hxx>
  25 #include <rtl/ustring.hxx>
  26 #include "charttoolsdllapi.hxx"
  27
  28 #include <algorithm>
  29 #include <limits>
  30
  31 namespace chart::CommonFunctors
  32 {
  33
  34 /** unary function to convert any type T into a css::uno::Any.
  35
  36     <p>uno::makeAny is an inline function.  Thus is cannot be taken directly
  37     (via mem_fun_ptr)</p>
  38 */
  39 struct makeAny
  40 {
  41     template< typename T >
  42     css::uno::Any operator() ( const T & aVal )
  43     {
  44         return css::uno::Any( aVal );
  45     }
  46 };
  47
  48 /** unary function to convert an OUString or css::uno::Any into a double number.
  49
  50     <p>For conversion of OUString, rtl::math::StringToDouble is used.</p>
  51     <p>In case no number can be generated from the Any, NaN is returned.</p>
  52  */
  53 struct OOO_DLLPUBLIC_CHARTTOOLS ToDouble
  54 {
  55     double operator() ( const css::uno::Any & rAny )
  56     {
  57         double fResult = std::numeric_limits<double>::quiet_NaN();
  58         rAny >>= fResult;
  59         return fResult;
  60     }
  61
  62     double operator() ( std::u16string_view rStr )
  63     {
  64         rtl_math_ConversionStatus eConversionStatus;
  65         double fResult = ::rtl::math::stringToDouble( rStr, '.', ',', & eConversionStatus );
  66
  67         if( eConversionStatus != rtl_math_ConversionStatus_Ok )
  68             return std::numeric_limits<double>::quiet_NaN();
  69
  70         return fResult;
  71     }
  72 };
  73
  74 /** unary function to convert a double number or css::uno::Any into an OUString.
  75
  76     <p>For conversion of doubles, rtl::math::DoubleToOUString is used.</p>
  77  */
  78 struct OOO_DLLPUBLIC_CHARTTOOLS ToString
  79 {
  80     OUString operator() ( const css::uno::Any & rAny )
  81     {
  82         if( auto pDouble = o3tl::tryAccess<double>(rAny) )
  83         {
  84             if( std::isnan(*pDouble) )
  85                 return OUString();
  86             return ::rtl::math::doubleToUString(
  87                 * pDouble,
  88                 rtl_math_StringFormat_Automatic,
  89                 rtl_math_DecimalPlaces_Max, // use maximum decimal places available
  90                 '.', // decimal separator
  91                 true // remove trailing zeros
  92                 );
  93         }
  94         else if( auto s = o3tl::tryAccess<OUString>(rAny) )
  95         {
  96             return *s;
  97         }
  98
  99         return OUString();
 100     }
 101
 102     OUString operator() ( double fNumber )
 103     {
 104         return ::rtl::math::doubleToUString(
 105             fNumber,
 106             rtl_math_StringFormat_Automatic,
 107             rtl_math_DecimalPlaces_Max, // use maximum decimal places available
 108             '.',
 109             true
 110             );
 111     }
 112 };
 113
 114 template <class Container, class Func> auto convertToSequence(const Container& container, Func f)
 115 {
 116     css::uno::Sequence<decltype(f(container[0]))> result(container.size());
 117     std::transform(container.begin(), container.end(), result.getArray(), f);
 118     return result;
 119 }
 120
 121 } //  namespace chart::CommonFunctors
 122
 123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */