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comparison.hpp
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comparison.hpp
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#ifndef SEMVER_COMPARISON_HPP
#define SEMVER_COMPARISON_HPP
#include <string>
#include <algorithm>
#include <poac/util/semver/version.hpp>
// https://yohhoy.hatenadiary.jp/entry/20120115/p1
#undef min
#undef max
namespace semver {
namespace detail {
constexpr bool
is_digit(const char& c) noexcept {
return '0' <= c && c <= '9';
}
bool is_number(const std::string& s) {
return !s.empty()
&& std::find_if(s.begin(), s.end(),
[&](auto& c) { return !is_digit(c); }) == s.end();
}
bool gt_pre(const Version& lhs, const Version& rhs) {
// NOT having a prerelease is > having one
if (lhs.pre.empty() && !rhs.pre.empty()) { // gt
return true;
}
const int lhs_pre_size = static_cast<int>(lhs.pre.size());
const int rhs_pre_size = static_cast<int>(rhs.pre.size());
const int max_size = std::max(lhs_pre_size, rhs_pre_size);
for (int i = 0; i <= max_size; ++i) {
if (i >= lhs_pre_size && i >= rhs_pre_size) {
return false; // eq
}
else if (i >= lhs_pre_size) {
return false; // lt
}
else if (i >= rhs_pre_size) {
return true; // gt
}
else if (lhs.pre[i] == rhs.pre[i]) {
continue;
}
else if (!is_number(lhs.pre[i]) && is_number(rhs.pre[i])) {
return true;
}
else if (lhs.pre[i] > rhs.pre[i]) {
return true;
}
else if (is_number(lhs.pre[i]) && is_number(rhs.pre[i])) {
if (std::stoull(lhs.pre[i]) > std::stoull(rhs.pre[i])) {
return true;
}
}
else {
return false;
}
}
return false;
}
bool eq_pre(const Version& lhs, const Version& rhs) {
if (lhs.pre.empty() && rhs.pre.empty()) { // eq
return true;
}
const int lhs_pre_size = static_cast<int>(lhs.pre.size());
const int rhs_pre_size = static_cast<int>(rhs.pre.size());
const int max_size = std::max(lhs_pre_size, rhs_pre_size);
for (int i = 0; i <= max_size; ++i) {
if (i >= lhs_pre_size && i >= rhs_pre_size) {
return true; // eq
}
else if (i >= rhs_pre_size) {
return false; // gt
}
else if (i >= lhs_pre_size) {
return false; // lt
}
else if (lhs.pre[i] == rhs.pre[i]) {
continue;
}
else {
return false;
}
}
return true;
}
} // end namespace detail
inline bool
operator==(const Version& lhs, const Version& rhs) {
return lhs.major == rhs.major
&& lhs.minor == rhs.minor
&& lhs.patch == rhs.patch
&& detail::eq_pre(lhs, rhs);
}
inline bool
operator==(const Version& lhs, const std::string& rhs) {
return lhs == Version(rhs);
}
inline bool
operator==(const std::string& lhs, const Version& rhs) {
return Version(lhs) == rhs;
}
inline bool
operator==(const Version& lhs, const char* rhs) {
return lhs == Version(rhs);
}
inline bool
operator==(const char* lhs, const Version& rhs) {
return Version(lhs) == rhs;
}
inline bool
operator!=(const Version& lhs, const Version& rhs) {
return !(lhs == rhs);
}
inline bool
operator!=(const Version& lhs, const std::string& rhs) {
return !(lhs == rhs);
}
inline bool
operator!=(const std::string& lhs, const Version& rhs) {
return !(lhs == rhs);
}
inline bool
operator!=(const Version& lhs, const char* rhs) {
return !(lhs == rhs);
}
inline bool
operator!=(const char* lhs, const Version& rhs) {
return !(lhs == rhs);
}
inline bool
operator>(const Version& lhs, const Version& rhs) { // gt
if (lhs.major != rhs.major) {
return lhs.major > rhs.major;
}
else if (lhs.minor != rhs.minor) {
return lhs.minor > rhs.minor;
}
else if (lhs.patch != rhs.patch) {
return lhs.patch > rhs.patch;
}
else {
return detail::gt_pre(lhs, rhs);
}
}
inline bool
operator>(const Version& lhs, const std::string& rhs) {
return lhs > Version(rhs);
}
inline bool
operator>(const std::string& lhs, const Version& rhs) {
return Version(lhs) > rhs;
}
inline bool
operator>(const Version& lhs, const char* rhs) {
return lhs > Version(rhs);
}
inline bool
operator>(const char* lhs, const Version& rhs) {
return Version(lhs) > rhs;
}
inline bool
operator<(const Version& lhs, const Version& rhs) {
return rhs > lhs;
}
inline bool
operator<(const Version& lhs, const std::string& rhs) {
return rhs > lhs;
}
inline bool
operator<(const std::string& lhs, const Version& rhs) {
return rhs > lhs;
}
inline bool
operator<(const Version& lhs, const char* rhs) {
return rhs > lhs;
}
inline bool
operator<(const char* lhs, const Version& rhs) {
return rhs > lhs;
}
inline bool
operator>=(const Version& lhs, const Version& rhs) {
return lhs > rhs || lhs == rhs;
}
inline bool
operator>=(const Version& lhs, const std::string& rhs) {
return lhs > rhs || lhs == rhs;
}
inline bool
operator>=(const std::string& lhs, const Version& rhs) {
return lhs > rhs || lhs == rhs;
}
inline bool
operator>=(const Version& lhs, const char* rhs) {
return lhs > rhs || lhs == rhs;
}
inline bool
operator>=(const char* lhs, const Version& rhs) {
return lhs > rhs || lhs == rhs;
}
inline bool
operator<=(const Version& lhs, const Version& rhs) {
return lhs < rhs || lhs == rhs;
}
inline bool
operator<=(const Version& lhs, const std::string& rhs) {
return lhs < rhs || lhs == rhs;
}
inline bool
operator<=(const std::string& lhs, const Version& rhs) {
return lhs < rhs || lhs == rhs;
}
inline bool
operator<=(const Version& lhs, const char* rhs) {
return lhs < rhs || lhs == rhs;
}
inline bool
operator<=(const char* lhs, const Version& rhs) {
return lhs < rhs || lhs == rhs;
}
} // end namespace semver
#endif // !SEMVER_COMPARISON_HPP