#ifndef muz_PARSER_HPP
#define muz_PARSER_HPP

#include "commons.hpp"
#include "Lexer.hpp"

namespace muz
{
  MUZ_ERROR(syntax_error);

  /**
   * Build an AST given a token list.
   * @see Node
   * @see Lexer
   **/
  class Parser
  {
  public:
    explicit Parser();
    virtual ~Parser();

    std::shared_ptr<Node> parse(Lexer& lexer);

  private:
    std::vector<std::shared_ptr<Node>> m_tokens;
    size_t m_cursor = 0;

    int current_line();
    std::shared_ptr<Node> consume(std::optional<NodeType> type=std::nullopt);
    NodeType peek(size_t lookahead=0) const;
    bool next_is(NodeType type, size_t lookahead=0) const;

    std::shared_ptr<Node> parse_prog();
    std::shared_ptr<Node> parse_instr();
    std::shared_ptr<Node> parse_dir();
    std::shared_ptr<Node> parse_cmd();
    std::shared_ptr<Node> parse_arg();
    std::shared_ptr<Node> parse_literal();

  };
}

#endif