1 //===- CommentVisitor.h - Visitor for Comment subclasses --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_CLANG_AST_COMMENTVISITOR_H
11 #define LLVM_CLANG_AST_COMMENTVISITOR_H
13 #include "clang/AST/Comment.h"
14 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/Support/ErrorHandling.h"
19 template <template <typename> class Ptr, typename ImplClass,
20 typename RetTy = void, class... ParamTys>
21 class CommentVisitorBase {
23 #define PTR(CLASS) typename Ptr<CLASS>::type
24 #define DISPATCH(NAME, CLASS) \
25 return static_cast<ImplClass *>(this)->visit##NAME( \
26 static_cast<PTR(CLASS)>(C), std::forward<ParamTys>(P)...)
28 RetTy visit(PTR(Comment) C, ParamTys... P) {
32 switch (C->getCommentKind()) {
33 default: llvm_unreachable("Unknown comment kind!");
34 #define ABSTRACT_COMMENT(COMMENT)
35 #define COMMENT(CLASS, PARENT) \
36 case Comment::CLASS##Kind: DISPATCH(CLASS, CLASS);
37 #include "clang/AST/CommentNodes.inc"
38 #undef ABSTRACT_COMMENT
43 // If the derived class does not implement a certain Visit* method, fall back
44 // on Visit* method for the superclass.
45 #define ABSTRACT_COMMENT(COMMENT) COMMENT
46 #define COMMENT(CLASS, PARENT) \
47 RetTy visit##CLASS(PTR(CLASS) C, ParamTys... P) { DISPATCH(PARENT, PARENT); }
48 #include "clang/AST/CommentNodes.inc"
49 #undef ABSTRACT_COMMENT
52 RetTy visitComment(PTR(Comment) C, ParamTys... P) { return RetTy(); }
58 template <typename ImplClass, typename RetTy = void, class... ParamTys>
59 class CommentVisitor : public CommentVisitorBase<std::add_pointer, ImplClass,
60 RetTy, ParamTys...> {};
62 template <typename ImplClass, typename RetTy = void, class... ParamTys>
63 class ConstCommentVisitor
64 : public CommentVisitorBase<llvm::make_const_ptr, ImplClass, RetTy,
67 } // namespace comments
70 #endif // LLVM_CLANG_AST_COMMENTVISITOR_H