bool try_stou(const pal::string_t& str, unsigned* num)
{
if (str.empty())
{
return false;
}
if (str.find_first_not_of(_X("0123456789")) != pal::string_t::npos)
{
return false;
}
*num = (unsigned) std::stoul(str);
return true;
}
size_t index_of_non_numeric(const pal::string_t& str, unsigned i)
{
return str.find_first_not_of(_X("0123456789"), i);
}
bool parse_internal(const pal::string_t& ver, fx_ver_t* fx_ver, bool parse_only_production)
{
size_t maj_start = 0;
size_t maj_sep = ver.find(_X('.'));
if (maj_sep == pal::string_t::npos)
{
return false;
}
unsigned major = 0;
if (!try_stou(ver.substr(maj_start, maj_sep), &major))
{
return false;
}
size_t min_start = maj_sep + 1;
size_t min_sep = ver.find(_X('.'), min_start);
if (min_sep == pal::string_t::npos)
{
return false;
}
unsigned minor = 0;
if (!try_stou(ver.substr(min_start, min_sep - min_start), &minor))
{
return false;
}
unsigned patch = 0;
size_t pat_start = min_sep + 1;
size_t pat_sep = ver.find_first_not_of(_X("0123456789"), pat_start);
if (pat_sep == pal::string_t::npos)
{
if (!try_stou(ver.substr(pat_start), &patch))
{
return false;
}
*fx_ver = fx_ver_t(major, minor, patch);
return true;
}
if (parse_only_production)
{
// This is a prerelease or has build suffix.
return false;
}
if (!try_stou(ver.substr(pat_start, pat_sep - pat_start), &patch))
{
return false;
}
size_t pre_start = pat_sep;
size_t pre_sep = ver.find(_X('+'), pre_start);
if (pre_sep == pal::string_t::npos)
{
*fx_ver = fx_ver_t(major, minor, patch, ver.substr(pre_start));
return true;
}
else
{
size_t build_start = pre_sep + 1;
*fx_ver = fx_ver_t(major, minor, patch, ver.substr(pre_start, pre_sep - pre_start), ver.substr(build_start));
return true;
}
}