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Support for hex numbers in string to integer conversions (with '0x' prefix) and special keywords in string to bool conversions (true/false/on/off/yes/no)

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This commit is contained in:
Bart Trzynadlowski 2016-08-24 04:11:52 +00:00
parent f08ad1584f
commit c2f80cef6b
1 changed files with 75 additions and 0 deletions
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75
Src/Util/GenericValue.h
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@ -7,9 +7,80 @@
#include <sstream>
#include <stdexcept>
#include <memory>
#include <cctype>
namespace Util
{
namespace detail
{
// Support for hexadecimal conversion for 16-bit or greater integers.
// Cannot distinguish chars from 8-bit integers, so unsupported there.
template <typename T>
struct IntegerEncodableAsHex
{
static constexpr const bool value = std::is_integral<T>::value && sizeof(T) >= 2 && sizeof(T) <= 8;
};
// This case should never actually be called
template <typename T>
static typename std::enable_if<!IntegerEncodableAsHex<T>::value, T>::type ParseInteger(const std::string &str)
{
return T();
}
// This case will be generated for hex encodable integers and executed
template <typename T>
static typename std::enable_if<IntegerEncodableAsHex<T>::value, T>::type ParseInteger(const std::string &str)
{
T tmp = 0;
if (str.find_first_of("0x") == 0 || str.find_first_of("-0x") == 0 || str.find_first_of("+0x") == 0)
{
bool negative = str[0] == '-';
size_t start_at = 2 + ((negative || str[0] == '+') ? 1 : 0);
for (size_t i = start_at; i < str.size(); i++)
{
tmp *= 16;
char c = str[i];
if (isdigit(c))
tmp |= (c - '0');
else if (isupper(c))
tmp |= (c - 'A' + 10);
else if (islower(c))
tmp |= (c - 'a' + 10);
}
if (negative)
tmp *= -1;
return tmp;
}
std::stringstream ss;
ss << str;
ss >> tmp;
return tmp;
}
// This case should never actually be called
template <typename T>
inline T ParseBool(const std::string &str)
{
return T();
}
// This case will be generated for bools
template <>
inline bool ParseBool<bool>(const std::string &str)
{
if (!Util::Stricmp(str.c_str(), "true") || !Util::Stricmp(str.c_str(), "on") || !Util::Stricmp(str.c_str(), "yes"))
return true;
if (!Util::Stricmp(str.c_str(), "false") || !Util::Stricmp(str.c_str(), "off") || !Util::Stricmp(str.c_str(), "no"))
return false;
bool tmp;
std::stringstream ss;
ss << str;
ss >> tmp;
return tmp;
}
}
class GenericValue
{
private:
@ -38,6 +109,10 @@ namespace Util
{
if (m_type == std::type_index(typeid(T)))
return *reinterpret_cast<const T *>(GetData());
if (m_type == std::type_index(typeid(std::string)) && detail::IntegerEncodableAsHex<T>::value)
return detail::ParseInteger<T>(Value<std::string>()); // special case string -> integer conversion
if (m_type == std::type_index(typeid(std::string)) && std::type_index(typeid(T)) == std::type_index(typeid(bool)))
return detail::ParseBool<T>(Value<std::string>()); // special case string -> bool conversion
std::stringstream ss;
Serialize(&ss);
T tmp;