gcc/rust/expand/rust-macro-invoc-lexer.h

   1 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   2
   3 // This file is part of GCC.
   4
   5 // GCC is free software; you can redistribute it and/or modify it under
   6 // the terms of the GNU General Public License as published by the Free
   7 // Software Foundation; either version 3, or (at your option) any later
   8 // version.
   9
  10 // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13 // for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with GCC; see the file COPYING3.  If not see
  17 // <http://www.gnu.org/licenses/>.
  18
  19 #ifndef RUST_MACRO_INVOC_LEXER_H
  20 #define RUST_MACRO_INVOC_LEXER_H
  21
  22 #include "rust-ast.h"
  23
  24 namespace Rust {
  25 class MacroInvocLexer
  26 {
  27 public:
  28   MacroInvocLexer (std::vector<std::unique_ptr<AST::Token>> stream)
  29     : offs (0), token_stream (std::move (stream))
  30   {}
  31
  32   // Returns token n tokens ahead of current position.
  33   const_TokenPtr peek_token (int n);
  34
  35   // Peeks the current token.
  36   const_TokenPtr peek_token () { return peek_token (0); }
  37
  38   // Advances current token to n + 1 tokens ahead of current position.
  39   void skip_token (int n);
  40
  41   // Skips the current token.
  42   void skip_token () { skip_token (0); }
  43
  44   // Splits the current token into two. Intended for use with nested generics
  45   // closes (i.e. T<U<X>> where >> is wrongly lexed as one token). Note that
  46   // this will only work with "simple" tokens like punctuation.
  47   void split_current_token (TokenId new_left, TokenId new_right);
  48
  49   std::string get_filename () const
  50   {
  51     // FIXME
  52     gcc_unreachable ();
  53     return "FIXME";
  54   }
  55
  56   size_t get_offs () const { return offs; }
  57
  58   std::vector<std::unique_ptr<AST::Token>>
  59   get_token_slice (size_t start_idx, size_t end_idx) const;
  60
  61 private:
  62   size_t offs;
  63   std::vector<std::unique_ptr<AST::Token>> token_stream;
  64 };
  65 } // namespace Rust
  66
  67 #endif // RUST_MACRO_INVOC_LEXER_H