49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#ifndef MONICELLI_AST_VISITOR_H
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#define MONICELLI_AST_VISITOR_H
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// Copyright 2017 the Monicelli project authors. All rights reserved.
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// Use of this source code is governed by a GPLv3 license, see LICENSE.txt.
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#include "ast.def"
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#include "ast.h"
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#include "errors.h"
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namespace monicelli {
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#define DECLARE_CLASS(NAME) class NAME;
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#define DEFAULT_VISIT(NAME) \
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T visit##NAME(const NAME*) { UNREACHABLE("Unhandled " #NAME "."); }
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#define DISPATCH_CONST_STATEMENT(NAME) \
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case AstNode::TYPE_##NAME: \
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return derived().visit##NAME(static_cast<const NAME*>(node));
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AST_NODES(DECLARE_CLASS)
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template<typename AstVisitorImpl, typename T> class ConstAstVisitor {
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public:
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AST_NODES(DEFAULT_VISIT)
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T visit(const AstNode* node) {
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switch (node->getClassType()) {
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AST_NODES(DISPATCH_CONST_STATEMENT)
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default:
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UNREACHABLE("Unknown AstNode type class.");
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}
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}
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T visit(const AstNode& node) { return visit(&node); }
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private:
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AstVisitorImpl& derived() { return *static_cast<AstVisitorImpl*>(this); }
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};
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#undef DECLARE_CLASS
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#undef DEFAULT_VISIT
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#undef DISPATCH_CONST_STATEMENT
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} // namespace monicelli
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#endif
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