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Options.hpp
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Options.hpp
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#pragma once
#include <concepts>
#include <cstring>
#include <exception>
#include <filesystem>
#include <string>
#define EXPECTION(COND, VALUE) \
[&] { \
if (COND) try { \
return ::opt_helper::Expection<decltype(VALUE)>{VALUE}; \
} catch (...) { \
return ::opt_helper::Expection<decltype(VALUE)>{::opt_helper::FailType::Try}; \
} \
else return ::opt_helper::Expection<decltype(VALUE)>{::opt_helper::FailType::If}; \
}()
namespace opt_helper {
enum class FailType { If, Try, Non };
template <typename T>
struct Expection {
T value;
FailType reason = FailType::Non;
constexpr Expection() = default;
constexpr Expection(const Expection&) = default;
constexpr Expection(Expection&&) = default;
constexpr Expection& operator=(const Expection&) = default;
constexpr Expection& operator=(Expection&&) = default;
constexpr Expection(const T& d) {
value = d;
reason = FailType::Non;
}
constexpr Expection(const FailType& f) { reason = f; }
constexpr T& expect(auto&& f) {
if (reason != FailType::Non) {
if constexpr (std::convertible_to<decltype(f(reason)), T>) {
value = f(reason);
} else {
f(reason);
std::terminate();
}
}
return value;
}
};
template <typename T>
struct OptVal {
const T* data;
auto tos() {
if constexpr (std::is_same_v<std::remove_cvref_t<T>, char>) {
return EXPECTION(data != nullptr, std::string(data));
} else {
return EXPECTION(data != nullptr, std::wstring(data));
}
}
auto toi() { return EXPECTION(data != nullptr, std::stoi(data)); }
auto tol() { return EXPECTION(data != nullptr, std::stol(data)); }
auto toll() { return EXPECTION(data != nullptr, std::stoll(data)); }
auto toul() { return EXPECTION(data != nullptr, std::stoul(data)); }
auto toull() { return EXPECTION(data != nullptr, std::stoull(data)); }
auto tod() { return EXPECTION(data != nullptr, std::stod(data)); }
auto tof() { return EXPECTION(data != nullptr, std::stof(data)); }
auto told() { return EXPECTION(data != nullptr, std::stold(data)); }
auto tob() {
if constexpr (std::is_same_v<std::remove_cvref_t<T>, char>) {
return EXPECTION(data != nullptr, std::strcmp(data, "true") == 0);
} else {
return EXPECTION(data != nullptr, std::wcscmp(data, "true") == 0);
}
}
auto top() { return EXPECTION(data != nullptr, std::filesystem::path(data)); }
auto empty() { return data == nullptr || data[0] == '\0'; }
};
struct ExistResult {
bool exist;
bool has_arg;
constexpr operator bool() { return exist; }
};
template <typename T, typename U>
struct Parser {
T argc;
U** argv;
template <auto first_opt, auto... opt>
OptVal<U> get() {
if constexpr (std::is_same_v<std::remove_cvref_t<U>, char>) {
const char* r = nullptr;
for (T i = 0; i < argc; i++) {
bool not_match = false;
T index = 0;
for (auto c : first_opt) {
if (argv[i][index] != c || argv[i][index] == '\0') {
not_match = true;
break;
}
index++;
}
if (not_match) continue;
if (argv[i][index] != '=' || argv[i][index] == '\0'
|| (argv[i][index] == '=' && argv[i][index + 1] == '\0'))
r = nullptr;
else r = &argv[i][(argv[i][index] == '=' ? index + 1 : index)];
}
if (r == nullptr) {
if constexpr (sizeof...(opt) != 0) {
return get<opt...>();
} else {
return {nullptr};
}
} else {
return {r};
}
} else {
const wchar_t* r = nullptr;
for (T i = 0; i < argc; i++) {
bool not_match = false;
T index = 0;
for (auto c : first_opt) {
if (argv[i][index] != c || argv[i][index] == '\0') {
not_match = true;
break;
}
index++;
}
if (not_match) continue;
if (argv[i][index] != '=' || argv[i][index] == '\0'
|| (argv[i][index] == '=' && argv[i][index + 1] == '\0'))
r = nullptr;
else r = &argv[i][(argv[i][index] == '=' ? index + 1 : index)];
}
if (r == nullptr) {
if constexpr (sizeof...(opt) != 0) {
return get<opt...>();
} else {
return {nullptr};
}
} else {
return {r};
}
}
}
template <auto first_opt, auto... opt>
ExistResult exist() {
if constexpr (std::is_same_v<std::remove_cvref_t<U>, char>) {
for (T i = 0; i < argc; i++) {
if (std::strlen(argv[i]) < first_opt.length) continue;
bool match = true;
for (::std::size_t j = 0; j < std::strlen(argv[i]); j++) {
if (argv[i][j] != first_opt[j]) {
match = false;
break;
}
}
if (std::strlen(argv[i]) > first_opt.length && argv[i][std::strlen(argv[i]) + 1] != '=') match = false;
if (match)
return {true, std::strlen(argv[i]) > first_opt.length && argv[i][std::strlen(argv[i]) + 1] == '='};
}
if constexpr (sizeof...(opt) != 0) return exist<opt...>();
else return {false, false};
} else {
for (T i = 0; i < argc; i++) {
if (std::wcslen(argv[i]) < first_opt.length) continue;
bool match = true;
for (::std::size_t j = 0; j < std::wcslen(argv[i]); j++) {
if (argv[i][j] != first_opt[j]) {
match = false;
break;
}
}
if (std::wcslen(argv[i]) > first_opt.length && argv[i][std::wcslen(argv[i]) + 1] != '=') match = false;
if (match)
return {true, std::wcslen(argv[i]) > first_opt.length && argv[i][std::wcslen(argv[i]) + 1] == '='};
}
if constexpr (sizeof...(opt) != 0) return exist<opt...>();
else return {false, false};
}
}
};
} // namespace opt_helper