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       1              : // Copyright (C) 2025-2026 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_TOKEN_TREE_DESUGAR_H
      20              : #define RUST_TOKEN_TREE_DESUGAR_H
      21              : 
      22              : #include "rust-ast-visitor.h"
      23              : #include "rust-system.h"
      24              : #include "rust-ast.h"
      25              : 
      26              : namespace Rust {
      27              : namespace AST {
      28              : 
      29              : /**
      30              :  * Desugar a given token-tree before parsing it for a macro invocation. At the
      31              :  * moment, the sole purpose of this desugar is to transform doc-comments into
      32              :  * their attribute form (/// comment -> #[doc = "comment"])
      33              :  */
      34         2444 : class TokenTreeDesugar : public DefaultASTVisitor
      35              : {
      36              : public:
      37         2444 :   TokenTreeDesugar () : desugared (std::vector<std::unique_ptr<TokenTree>> ())
      38              :   {}
      39              : 
      40              :   DelimTokenTree go (DelimTokenTree &tts);
      41              : 
      42              : private:
      43              :   std::vector<std::unique_ptr<TokenTree>> desugared;
      44              :   void append (TokenPtr &&new_token);
      45              :   void append (std::unique_ptr<TokenTree> &&new_token);
      46              : 
      47              :   using DefaultASTVisitor::visit;
      48              : 
      49              :   virtual void visit (Token &tts) override;
      50              : };
      51              : 
      52              : } // namespace AST
      53              : } // namespace Rust
      54              : 
      55              : #endif //! RUST_TOKEN_TREE_DESUGAR_H