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//===--- CommentVisitor.h - Visitor for Comment subclasses ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Comment.h"
#include "llvm/Support/ErrorHandling.h"
namespace clang {
namespace comments {
template <typename T> struct make_ptr { typedef T *type; };
template <typename T> struct make_const_ptr { typedef const T *type; };
template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
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))
RetTy visit(PTR(Comment) C) {
if (!C)
return RetTy();
switch (C->getCommentKind()) {
default: llvm_unreachable("Unknown comment kind!");
#define ABSTRACT_COMMENT(COMMENT)
#define COMMENT(CLASS, PARENT) \
case Comment::CLASS##Kind: 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) { DISPATCH(PARENT, PARENT); }
#include "clang/AST/CommentNodes.inc"
#undef ABSTRACT_COMMENT
#undef COMMENT
RetTy visitComment(PTR(Comment) C) { return RetTy(); }
#undef PTR
#undef DISPATCH
};
template<typename ImplClass, typename RetTy=void>
class CommentVisitor :
public CommentVisitorBase<make_ptr, ImplClass, RetTy> {};
template<typename ImplClass, typename RetTy=void>
class ConstCommentVisitor :
public CommentVisitorBase<make_const_ptr, ImplClass, RetTy> {};
} // end namespace comments
} // end namespace clang
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