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#ifndef VERSION_STRING_H
#define VERSION_STRING_H
#include <stdexcept>
#include <string>
class VersionString {
public:
VersionString()
: _major(0), _minor(0), _subminor(0), _hasMinor(0), _hasSubminor(0) {}
explicit VersionString(const std::string& str) {
if (str.empty()) throw std::runtime_error("Empty version string specified");
for (size_t i = 0; i != str.size(); ++i)
if (str[i] != '.' && (str[i] < '0' || str[i] > '9'))
throw std::runtime_error("Invalid version specified: '" + str + "'");
const size_t pos1 = str.find('.');
if (pos1 == std::string::npos) {
_major = std::atoi(str.c_str());
_minor = 0;
_subminor = 0;
_hasMinor = false;
_hasSubminor = false;
} else {
_major = std::atoi(str.substr(0, pos1).c_str());
_hasMinor = true;
const size_t pos2 = str.find('.', pos1 + 1);
if (pos2 == std::string::npos) {
_minor = std::atoi(str.substr(pos1 + 1).c_str());
_subminor = 0;
_hasSubminor = false;
} else {
_minor = std::atoi(str.substr(pos1 + 1, pos2 - pos1).c_str());
_subminor = std::atoi(str.substr(pos2 + 1).c_str());
_hasSubminor = true;
}
}
}
int Major() const { return _major; }
int Minor() const { return _minor; }
int Subminor() const { return _subminor; }
bool HasMinor() const { return _hasMinor; }
bool HasSubminor() const { return _hasSubminor; }
std::string String() const {
if (_hasMinor) {
if (_hasSubminor) {
return std::to_string(_major) + '.' + std::to_string(_minor) + '.' +
std::to_string(_subminor);
} else {
return std::to_string(_major) + '.' + std::to_string(_minor);
}
} else {
return std::to_string(_major);
}
}
private:
int _major, _minor, _subminor;
bool _hasMinor, _hasSubminor;
};
#endif
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