formalang/include/regular/RegularTree.hpp

#pragma once
#include <vector>
#include <memory>
#include <string>
#include <string_view>

namespace regular {
class RegularTree {
 public:
  class Node {
   public:
    enum class Type {
      Addition, Concatenation, Word
    };
    enum class Modifier {
      Plus, Star, None
    };

    Node();
    Node(Type);

    void Parse(const std::string&);
    void Print() const;
    std::vector<std::unique_ptr<Node>> children;
    std::string word;
    Type type;
    Modifier modifier = Modifier::None;
    std::string ToString() const;
   private:
    void ParseCurrentType(const std::string_view);
    void Compression();
    void Compression2();
    void Print(int nesting_level) const;
  };

  RegularTree(const std::string&);
  const Node& GetNode() const;
  void Print() const;
  std::string ToString() const;

 private:
  Node node_;
};
}