CommentVisitor.h source code [clang_source_code/include/clang/AST/CommentVisitor.h]

1	//===- CommentVisitor.h - Visitor for Comment subclasses --------- C++ --===//
2	//
3	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4	// See https://llvm.org/LICENSE.txt for license information.
5	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6	//
7	//===----------------------------------------------------------------------===//
8
9	#ifndef LLVM_CLANG_AST_COMMENTVISITOR_H
10	#define LLVM_CLANG_AST_COMMENTVISITOR_H
11
12	#include "clang/AST/Comment.h"
13	#include "llvm/ADT/STLExtras.h"
14	#include "llvm/Support/ErrorHandling.h"
15
16	namespace clang {
17	namespace comments {
18	template <template <typename> class Ptr, typename ImplClass,
19	typename RetTy = void, class... ParamTys>
20	class CommentVisitorBase {
21	public:
22	#define PTR(CLASS) typename Ptr<CLASS>::type
23	#define DISPATCH(NAME, CLASS) \
24	return static_cast<ImplClass *>(this)->visit##NAME( \
25	static_cast<PTR(CLASS)>(C), std::forward<ParamTys>(P)...)
26
27	RetTy visit(PTR(Comment) C, ParamTys... P) {
28	if (!C)
29	return RetTy();
30
31	switch (C->getCommentKind()) {
32	default: llvm_unreachable("Unknown comment kind!");
33	#define ABSTRACT_COMMENT(COMMENT)
34	#define COMMENT(CLASS, PARENT) \
35	case Comment::CLASS##Kind: DISPATCH(CLASS, CLASS);
36	#include "clang/AST/CommentNodes.inc"
37	#undef ABSTRACT_COMMENT
38	#undef COMMENT
39	}
40	}
41
42	// If the derived class does not implement a certain Visit* method, fall back
43	// on Visit* method for the superclass.
44	#define ABSTRACT_COMMENT(COMMENT) COMMENT
45	#define COMMENT(CLASS, PARENT) \
46	RetTy visit##CLASS(PTR(CLASS) C, ParamTys... P) { DISPATCH(PARENT, PARENT); }
47	#include "clang/AST/CommentNodes.inc"
48	#undef ABSTRACT_COMMENT
49	#undef COMMENT
50
51	RetTy visitComment(PTR(Comment) C, ParamTys... P) { return RetTy(); }
52
53	#undef PTR
54	#undef DISPATCH
55	};
56
57	template <typename ImplClass, typename RetTy = void, class... ParamTys>
58	class CommentVisitor : public CommentVisitorBase<std::add_pointer, ImplClass,
59	RetTy, ParamTys...> {};
60
61	template <typename ImplClass, typename RetTy = void, class... ParamTys>
62	class ConstCommentVisitor
63	: public CommentVisitorBase<llvm::make_const_ptr, ImplClass, RetTy,
64	ParamTys...> {};
65
66	} // namespace comments
67	} // namespace clang
68
69	#endif // LLVM_CLANG_AST_COMMENTVISITOR_H
70

clang::comments::CommentVisitorBase::visit

clang::comments::CommentVisitorBase::visitComment

Clang Project