XMLAttributeValueView.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  XMLAttributeValueView.cpp
 
  Dmitry Vedenko
 
**********************************************************************/
 
#include "XMLAttributeValueView.h"
#include "FromChars.h"
 
#include <numeric>
 
XMLAttributeValueView::XMLAttributeValueView(bool value) noexcept
    : mInteger(value)
    , mType(Type::UnsignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(short value) noexcept
    : mInteger(value)
    , mType(Type::SignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(unsigned short value) noexcept
    : mInteger(value)
    , mType(Type::UnsignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(int value) noexcept
    : mInteger(value)
    , mType(Type::SignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(unsigned int value) noexcept
    : mInteger(value)
    , mType(Type::UnsignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(long value) noexcept
    : mInteger(value)
    , mType(Type::SignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(unsigned long value) noexcept
    : mInteger(value)
    , mType(Type::UnsignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(long long value) noexcept
    : mInteger(value)
    , mType(Type::SignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(unsigned long long value) noexcept
    : mInteger(value)
    , mType(Type::UnsignedInteger)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(float value) noexcept
    : mFloat(value)
    , mType(Type::Float)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(double value) noexcept
    : mDouble(value)
    , mType(Type::Double)
{
}
 
XMLAttributeValueView::XMLAttributeValueView(
   const std::string_view& value) noexcept
    : mType(Type::StringView)
{
   mStringView.Data = value.data();
   mStringView.Length = value.length();
}
 
XMLAttributeValueView::Type XMLAttributeValueView::GetType() const noexcept
{
   return mType;
}
 
bool XMLAttributeValueView::IsNull() const noexcept
{
   return mType == Type::Null;
}
 
bool XMLAttributeValueView::IsSignedInteger() const noexcept
{
   return mType == Type::SignedInteger;
}
 
bool XMLAttributeValueView::IsUnsignedInteger() const noexcept
{
   return mType == Type::UnsignedInteger;
}
 
bool XMLAttributeValueView::IsFloat() const noexcept
{
   return mType == Type::Float;
}
 
bool XMLAttributeValueView::IsDouble() const noexcept
{
   return mType == Type::Double;
}
 
bool XMLAttributeValueView::IsStringView() const noexcept
{
   return mType == Type::StringView;
}
 
bool XMLAttributeValueView::TryGet(bool& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(short& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(unsigned short& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(int& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(unsigned int& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(long& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(unsigned long& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(long long& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(unsigned long long& value) const noexcept
{
   return TryGetInteger(value);
}
 
bool XMLAttributeValueView::TryGet(float& value) const noexcept
{
   if (mType == Type::Float)
   {
      value = mFloat;
      return true;
   }
   else if (mType == Type::SignedInteger || mType == Type::UnsignedInteger)
   {
      value = mInteger;
      return true;
   }
   else if (mType == Type::StringView)
   {
      const char* end = mStringView.Data + mStringView.Length;
 
      float tempValue = {};
 
      const auto result = FromChars(mStringView.Data, end, tempValue);
 
      if (result.ec == std::errc() && result.ptr == end)
      {
         value = tempValue;
         return true;
      }
   }
 
   return false;
}
 
bool XMLAttributeValueView::TryGet(double& value) const noexcept
{
   if (mType == Type::Float)
   {
      value = mFloat;
      return true;
   }
   else if (mType == Type::Double)
   {
      value = mDouble;
      return true;
   }
   else if (mType == Type::SignedInteger || mType == Type::UnsignedInteger)
   {
      value = mInteger;
      return true;
   }
   else if (mType == Type::StringView)
   {
      const char* end = mStringView.Data + mStringView.Length;
 
      double tempValue = {};
 
      const auto result = FromChars(mStringView.Data, end, tempValue);
 
      if (result.ec == std::errc() && result.ptr == end)
      {
         value = tempValue;
         return true;
      }
   }
 
   return false;
}
 
bool XMLAttributeValueView::TryGet(std::string_view& value) const noexcept
{
   if (mType != Type::StringView)
      return false;
 
   value = std::string_view(mStringView.Data, mStringView.Length);
 
   return true;
}
 
std::string XMLAttributeValueView::ToString() const
{
   switch (mType)
   {
   case XMLAttributeValueView::Type::Null:
      return {};
   case XMLAttributeValueView::Type::SignedInteger:
      return std::to_string(mInteger);
   case XMLAttributeValueView::Type::UnsignedInteger:
      return std::to_string(static_cast<uint64_t>(mInteger));
   case XMLAttributeValueView::Type::Float:
      return std::to_string(mFloat);
   case XMLAttributeValueView::Type::Double:
      return std::to_string(mDouble);
   case XMLAttributeValueView::Type::StringView:
      return std::string(mStringView.Data, mStringView.Length);
   }
 
   return {};
}
 
wxString XMLAttributeValueView::ToWString() const
{
   switch (mType)
   {
   case XMLAttributeValueView::Type::Null:
      return {};
   case XMLAttributeValueView::Type::SignedInteger:
      return wxString() << mInteger;
   case XMLAttributeValueView::Type::UnsignedInteger:
      return wxString() << static_cast<uint64_t>(mInteger);
   case XMLAttributeValueView::Type::Float:
      return wxString() << mFloat;
   case XMLAttributeValueView::Type::Double:
      return wxString() << mDouble;
   case XMLAttributeValueView::Type::StringView:
      return wxString::FromUTF8(mStringView.Data, mStringView.Length);
   }
 
   return {};
}
 
template <typename ResultType>
bool CheckInteger(ResultType& output, int64_t value) noexcept
{
   constexpr int64_t minValue = std::numeric_limits<ResultType>::min();
   constexpr int64_t maxValue = std::numeric_limits<ResultType>::max();
 
   if (minValue <= value && value <= maxValue)
   {
      output = static_cast<ResultType>(value);
      return true;
   }
 
   return false;
}
 
template <typename ResultType>
bool CheckInteger(ResultType& output, uint64_t value) noexcept
{
   constexpr uint64_t maxValue = std::numeric_limits<ResultType>::max();
   const uint64_t unsignedValue = static_cast<uint64_t>(value);
 
   if (unsignedValue <= maxValue)
   {
      output = static_cast<ResultType>(unsignedValue);
      return true;
   }
 
   return false;
}
 
template <typename ResultType>
bool XMLAttributeValueView::TryGetInteger(ResultType& value) const noexcept
{
   static_assert(std::is_integral_v<ResultType>);
 
   if (mType == Type::SignedInteger)
   {
      return CheckInteger(value, mInteger);
   }
   else if (mType == Type::UnsignedInteger)
   {
      return CheckInteger(value, static_cast<uint64_t>(mInteger));
   }
   else if (mType == Type::StringView)
   {
      const char* end = mStringView.Data + mStringView.Length;
 
      ResultType tempValue = {};
 
      const auto result = FromChars(mStringView.Data, end, tempValue);
 
      if (result.ec == std::errc() && result.ptr == end)
      {
         value = tempValue;
         return true;
      }
   }
 
   return false;
}