// file      : build/token -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#ifndef BUILD_TOKEN
#define BUILD_TOKEN

#include <string>
#include <iosfwd>
#include <cstddef> // size_t
#include <cstdint> // uint64_t
#include <cassert>
#include <utility> // move

namespace build
{
  enum class token_type
  {
    eos,
    name,
    newline,
    pair_separator,
    colon,
    lcbrace,
    rcbrace,
    equal,
    plus_equal,
    dollar,
    lparen,
    rparen
  };

  class token
  {
  public:
    token_type
    type () const {return t_;}

    // Token is whitespace-separated from the previous token.
    //
    bool
    separated () const {return s_;}

    std::string const&
    name () const {assert (t_ == token_type::name); return n_;}

    std::uint64_t line () const {return l_;}
    std::uint64_t column () const {return c_;}

  public:
    token (token_type t, bool s, std::uint64_t l, std::uint64_t c)
        : t_ (t), s_ (s), l_ (l), c_ (c) {}

    token (std::string n, bool s, std::uint64_t l, std::uint64_t c)
        : t_ (token_type::name), s_ (s), n_ (std::move (n)), l_ (l), c_ (c) {}

  private:
    token_type t_;
    bool s_;
    std::string n_;

    std::uint64_t l_;
    std::uint64_t c_;
  };

  // Output the token value in a format suitable for diagnostics.
  //
  std::ostream&
  operator<< (std::ostream&, const token&);
}

#endif // BUILD_TOKEN