libgrust/libproc_macro_internal/tokentree.h

   1 // Copyright (C) 2023-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU Proc Macro Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // Under Section 7 of GPL version 3, you are granted additional
  15 // permissions described in the GCC Runtime Library Exception, version
  16 // 3.1, as published by the Free Software Foundation.
  17
  18 // You should have received a copy of the GNU General Public License and
  19 // a copy of the GCC Runtime Library Exception along with this program;
  20 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 #ifndef TOKENTREE_H
  24 #define TOKENTREE_H
  25
  26 #include "group.h"
  27 #include "ident.h"
  28 #include "punct.h"
  29 #include "literal.h"
  30
  31 namespace ProcMacro {
  32
  33 enum TokenTreeTag
  34 {
  35   GROUP,
  36   IDENT,
  37   PUNCT,
  38   LITERAL
  39 };
  40
  41 union TokenTreePayload
  42 {
  43   Group group;
  44   Ident ident;
  45   Punct punct;
  46   Literal literal;
  47 };
  48
  49 struct TokenTree
  50 {
  51   TokenTreeTag tag;
  52   TokenTreePayload payload;
  53
  54 public:
  55   static TokenTree make_tokentree (Group group);
  56   static TokenTree make_tokentree (Ident ident);
  57   static TokenTree make_tokentree (Punct punct);
  58   static TokenTree make_tokentree (Literal literal);
  59
  60   static void drop (TokenTree *tt);
  61 };
  62
  63 } // namespace ProcMacro
  64
  65 #endif /* ! TOKENTREE_H */