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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef CVRT_TEXT_H_018727339083427097434
#define CVRT_TEXT_H_018727339083427097434
#include <chrono>
#include <zen/utf.h>
#include <zen/string_tools.h>
namespace zen
{
/**
\file
\brief Handle conversion of string-convertible types to and from std::string.
It is \b not required to call these functions directly. They are implicitly used by zen::XmlElement::getValue(),
zen::XmlElement::setValue(), zen::XmlElement::getAttribute() and zen::XmlElement::setAttribute().
\n\n
Conversions for the following user types are supported by default:
- strings - std::string, std::wstring, char*, wchar_t*, char, wchar_t, etc..., all STL-compatible-string-classes
- numbers - int, double, float, bool, long, etc..., all built-in numbers
- STL containers - std::map, std::set, std::vector, std::list, etc..., all STL-compatible-containers
- std::pair
You can add support for additional types via template specialization. \n\n
Specialize zen::readStruc() and zen::writeStruc() to enable conversion from structured user types to XML elements.
Specialize zen::readText() and zen::writeText() to enable conversion from string-convertible user types to std::string.
Prefer latter if possible since it does not only enable conversions from XML elements to user data, but also from and to XML attributes.
\n\n
<b> Example: </b> type "bool"
\code
namespace zen
{
template <> inline
void writeText(const bool& value, std::string& output)
{
output = value ? "true" : "false";
}
template <> inline
bool readText(const std::string& input, bool& value)
{
const std::string tmp = trimCpy(input);
if (tmp == "true")
value = true;
else if (tmp == "false")
value = false;
else
return false;
return true;
}
}
\endcode
*/
///Convert text to user data - used by XML elements and attributes
/**
\param input Input text.
\param value Conversion target value.
\return "true" if value was read successfully.
*/
template <class T> bool readText(const std::string& input, T& value);
///Convert user data into text - used by XML elements and attributes
/**
\param value The value to be converted.
\param output Output text.
*/
template <class T> void writeText(const T& value, std::string& output);
/* Different classes of data types:
-----------------------------
| structured | readStruc/writeStruc - e.g. string-convertible types, STL containers, std::pair, structured user types
| ------------------------- |
| | to-string-convertible | | readText/writeText - e.g. string-like types, all built-in arithmetic numbers, bool
| | --------------- | |
| | | string-like | | | utfTo - e.g. std::string, wchar_t*, char[], wchar_t, wxString, MyStringClass, ...
| | --------------- | |
| ------------------------- |
-----------------------------
*/
//------------------------------ implementation -------------------------------------
template <class T>
struct IsChronoDuration
{
private:
using Yes = char[1];
using No = char[2];
template <class Rep, class Period>
static Yes& isDuration(std::chrono::duration<Rep, Period>);
static No& isDuration(...);
public:
enum { value = sizeof(isDuration(std::declval<T>())) == sizeof(Yes) };
};
//Conversion from arbitrary types to text (for use with XML elements and attributes)
enum class TextType
{
boolean,
number,
chrono,
string,
other,
};
template <class T>
struct GetTextType : std::integral_constant<TextType,
std::is_same_v<T, bool> ? TextType::boolean :
isStringLike<T> ? TextType::string : //string before number to correctly handle char/wchar_t -> this was an issue with Loki only!
isArithmetic<T> ? TextType::number : //
IsChronoDuration<T>::value ? TextType::chrono :
TextType::other> {};
//######################################################################################
template <class T, TextType type>
struct ConvertText;
/* -> expected interface
{
void writeText(const T& value, std::string& output) const;
bool readText(const std::string& input, T& value) const;
};
*/
//partial specialization: type bool
template <class T>
struct ConvertText<T, TextType::boolean>
{
void writeText(bool value, std::string& output) const
{
output = value ? "true" : "false";
}
bool readText(const std::string& input, bool& value) const
{
const std::string tmp = trimCpy(input);
if (tmp == "true")
value = true;
else if (tmp == "false")
value = false;
else
return false;
return true;
}
};
//partial specialization: handle conversion for all built-in arithmetic types!
template <class T>
struct ConvertText<T, TextType::number>
{
void writeText(const T& value, std::string& output) const
{
output = numberTo<std::string>(value);
}
bool readText(const std::string& input, T& value) const
{
value = stringTo<T>(input);
return true;
}
};
template <class T>
struct ConvertText<T, TextType::chrono>
{
void writeText(const T& value, std::string& output) const
{
output = numberTo<std::string>(value.count());
}
bool readText(const std::string& input, T& value) const
{
value = T(stringTo<typename T::rep>(input));
return true;
}
};
//partial specialization: handle conversion for all string-like types!
template <class T>
struct ConvertText<T, TextType::string>
{
void writeText(const T& value, std::string& output) const
{
output = utfTo<std::string>(value);
}
bool readText(const std::string& input, T& value) const
{
value = utfTo<T>(input);
return true;
}
};
//partial specialization: unknown type
template <class T>
struct ConvertText<T, TextType::other>
{
//###########################################################################################################################################
static_assert(sizeof(T) == -1);
/*
ATTENTION: The data type T is yet unknown to the zen::Xml framework!
Please provide a specialization for T of the following two functions in order to handle conversions to XML elements and attributes
template <> void zen::writeText(const T& value, std::string& output)
template <> bool zen::readText(const std::string& input, T& value)
If T is structured and cannot be converted to a text representation specialize these two functions to allow at least for conversions to XML elements:
template <> void zen::writeStruc(const T& value, XmlElement& output)
template <> bool zen::readStruc(const XmlElement& input, T& value)
*/
//###########################################################################################################################################
};
template <class T> inline
void writeText(const T& value, std::string& output)
{
ConvertText<T, GetTextType<T>::value>().writeText(value, output);
}
template <class T> inline
bool readText(const std::string& input, T& value)
{
return ConvertText<T, GetTextType<T>::value>().readText(input, value);
}
}
#endif //CVRT_TEXT_H_018727339083427097434
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