node.hpp

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#ifndef NODE_HPP_
#define NODE_HPP_

#include <iosfwd>
#include <memory>
#include <string>
#include <vector>

class node_impl;

class node;

typedef std::vector<node> node_list;

typedef std::vector<std::string> identifier_list;

class node {
public:
  node();
  node(double number);
  node(std::string identifier);
  node(char op, node operand);
  node(node left, char op, node right);
  node(identifier_list parameters, node definition);
  node(std::string name, node_list const& arguments);

  node(node const&) = default;
  node(node&&) = default;
  node& operator=(node const&) = default;
  node& operator=(node&&) = default;
  ~node();

  void print(std::ostream& stream, int indent = 0) const;
  double evaluate() const;
  std::string to_string() const;
  identifier_list const& get_parameters() const;

private:
  static std::shared_ptr<node_impl> make_binary_operator(node, char, node);

  std::shared_ptr<node_impl> pimpl_;
};

#endif