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//===- CommentVisitor.h - Visitor for Comment subclasses --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_COMMENTVISITOR_H
#define LLVM_CLANG_AST_COMMENTVISITOR_H
#include "clang/AST/Comment.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
namespace clang {
namespace comments {
template <template <typename> class Ptr, typename ImplClass,
typename RetTy = void, class... ParamTys>
class CommentVisitorBase {
public:
#define PTR(CLASS) typename Ptr<CLASS>::type
#define DISPATCH(NAME, CLASS) \
return static_cast<ImplClass *>(this)->visit##NAME( \
static_cast<PTR(CLASS)>(C), std::forward<ParamTys>(P)...)
RetTy visit(PTR(Comment) C, ParamTys... P) {
if (!C)
return RetTy();
switch (C->getCommentKind()) {
default: llvm_unreachable("Unknown comment kind!");
#define ABSTRACT_COMMENT(COMMENT)
#define COMMENT(CLASS, PARENT) \
case CommentKind::CLASS: \
DISPATCH(CLASS, CLASS);
#include "clang/AST/CommentNodes.inc"
#undef ABSTRACT_COMMENT
#undef COMMENT
}
}
// If the derived class does not implement a certain Visit* method, fall back
// on Visit* method for the superclass.
#define ABSTRACT_COMMENT(COMMENT) COMMENT
#define COMMENT(CLASS, PARENT) \
RetTy visit##CLASS(PTR(CLASS) C, ParamTys... P) { DISPATCH(PARENT, PARENT); }
#include "clang/AST/CommentNodes.inc"
#undef ABSTRACT_COMMENT
#undef COMMENT
RetTy visitComment(PTR(Comment) C, ParamTys... P) { return RetTy(); }
#undef PTR
#undef DISPATCH
};
template <typename ImplClass, typename RetTy = void, class... ParamTys>
class CommentVisitor : public CommentVisitorBase<std::add_pointer, ImplClass,
RetTy, ParamTys...> {};
template <typename ImplClass, typename RetTy = void, class... ParamTys>
class ConstCommentVisitor
: public CommentVisitorBase<llvm::make_const_ptr, ImplClass, RetTy,
ParamTys...> {};
} // namespace comments
} // namespace clang
#endif // LLVM_CLANG_AST_COMMENTVISITOR_H
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