80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
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#pragma once
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#include "../../num/parse.hpp"
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#include <optional>
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#include <string_view>
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#include <limits>
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#include <concepts>
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#include <cmath>
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#define NS_YYCC_NUM_PARSE ::yycc::num::parse
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namespace yycc::carton::clap::validator {
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/**
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* @brief The concept for checking whether given type is a valid command line argument validator.
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* @details
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* A valid command line argument validator must have a type name or alias called "ReturnType"
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* indicating the return value of this validator.
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*
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* And, it also should have an member function called "validate"
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* which receive <TT>const std::string_view&</TT> as its only argument,
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* and return <TT>std::optional<ReturnType></TT> as result.
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* If this \t std::optional is empty, it means that there is some error occurs when validating,
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* otherwise, it is the validated value.
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*/
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template<typename T>
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concept Validator = requires(const T& t, const std::u8string_view& sv) {
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// Check whether there is T::ReturnType type
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typename T::ReturnType;
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// Check whether there is "validate" member function and it has correct signature.
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{ t.validate(sv) } -> std::same_as<std::optional<typename T::ReturnType>>;
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};
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template<std::integral T, auto TMin = std::numeric_limits<T>::min(), auto TMax = std::numeric_limits<T>::max()>
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struct IntegralValidator {
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static_assert(TMin <= TMax);
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using ReturnType = T;
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std::optional<ReturnType> validate(const std::u8string_view& sv) {
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auto rv = NS_YYCC_NUM_PARSE::parse<ReturnType>(sv);
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if (rv) {
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auto value = rv.value();
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if (value > TMax || value < TMin) return std::nullopt;
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else return value;
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} else return std::nullopt;
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}
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};
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template<std::floating_point T, auto TMin = std::numeric_limits<T>::lowest(), auto TMax = std::numeric_limits<T>::max()>
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struct FloatingPointValidator {
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static_assert(std::isfinite(TMin));
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static_assert(std::isfinite(TMax));
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static_assert(TMin <= TMax);
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using ReturnType = T;
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std::optional<ReturnType> validate(const std::u8string_view& sv) {
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auto rv = NS_YYCC_NUM_PARSE::parse<ReturnType>(sv);
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if (rv) {
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auto value = rv.value();
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if (value > TMax || value < TMin) return std::nullopt;
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else return value;
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} else return std::nullopt;
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}
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};
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struct BoolValidator {
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using ReturnType = bool;
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std::optional<ReturnType> validate(const std::u8string_view& sv) {
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auto rv = NS_YYCC_NUM_PARSE::parse<ReturnType>(sv);
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if (rv) return rv.value();
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else return std::nullopt;
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}
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};
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struct StringValidator {
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using ReturnType = std::u8string;
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std::optional<ReturnType> validate(const std::u8string_view& sv) { return std::u8string(sv); }
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};
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} // namespace yycc::carton::clap::validator
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#undef NS_YYCC_NUM_PARSE
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