json-validator/include/jvalidate/status.h

#pragma once

#include <compare>

namespace jvalidate {
class Status {
public:
  enum Enum { Accept, Reject, Noop };

private:
  Enum state_;

public:
  Status(bool state) : state_(state ? Accept : Reject) {}
  Status(Enum state) : state_(state) {}

  explicit operator bool() const { return state_ != Reject; }

  friend Status operator!(Status val) {
    if (val.state_ == Noop) {
      return Status::Noop;
    }
    return val.state_ == Reject ? Accept : Reject;
  }

  friend Status operator|(Status lhs, Status rhs) {
    if (lhs.state_ == Noop && rhs.state_ == Noop) {
      return Noop;
    }
    if (lhs.state_ == Accept || rhs.state_ == Accept) {
      return Accept;
    }
    return Reject;
  }

  friend Status operator&(Status lhs, Status rhs) {
    if (lhs.state_ == Noop && rhs.state_ == Noop) {
      return Noop;
    }
    if (lhs.state_ == Reject || rhs.state_ == Reject) {
      return Reject;
    }
    return Accept;
  }

  Status & operator&=(Status rhs) { return *this = *this & rhs; }
  Status & operator|=(Status rhs) { return *this = *this | rhs; }

  friend auto operator==(Status lhs, Status::Enum rhs) {
    return static_cast<int>(lhs.state_) == static_cast<int>(rhs);
  }
  friend auto operator!=(Status lhs, Status::Enum rhs) {
    return static_cast<int>(lhs.state_) != static_cast<int>(rhs);
  }
  friend auto operator<=>(Status lhs, Status rhs) {
    return static_cast<int>(lhs.state_) <=> static_cast<int>(rhs.state_);
  }
};
}