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Diffstat (limited to 'libsolidity/ast/ASTVisitor.h')
| -rw-r--r-- | libsolidity/ast/ASTVisitor.h | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/libsolidity/ast/ASTVisitor.h b/libsolidity/ast/ASTVisitor.h new file mode 100644 index 00000000..14c09fb4 --- /dev/null +++ b/libsolidity/ast/ASTVisitor.h @@ -0,0 +1,294 @@ +/* + This file is part of cpp-ethereum. + + cpp-ethereum is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + cpp-ethereum is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>. +*/ +/** + * @author Christian <c@ethdev.com> + * @date 2014 + * AST visitor base class. + */ + +#pragma once + +#include <string> +#include <functional> +#include <vector> +#include <libsolidity/ast/AST.h> + +namespace dev +{ +namespace solidity +{ + +/** + * Visitor interface for the abstract syntax tree. This class is tightly bound to the + * implementation of @ref ASTNode::accept and its overrides. After a call to + * @ref ASTNode::accept, the function visit for the appropriate parameter is called and then + * (if it returns true) this continues recursively for all child nodes in document order + * (there is an exception for contracts). After all child nodes have been visited, endVisit is + * called for the node. + */ +class ASTVisitor +{ +public: + virtual bool visit(SourceUnit& _node) { return visitNode(_node); } + virtual bool visit(ImportDirective& _node) { return visitNode(_node); } + virtual bool visit(ContractDefinition& _node) { return visitNode(_node); } + virtual bool visit(InheritanceSpecifier& _node) { return visitNode(_node); } + virtual bool visit(StructDefinition& _node) { return visitNode(_node); } + virtual bool visit(EnumDefinition& _node) { return visitNode(_node); } + virtual bool visit(EnumValue& _node) { return visitNode(_node); } + virtual bool visit(ParameterList& _node) { return visitNode(_node); } + virtual bool visit(FunctionDefinition& _node) { return visitNode(_node); } + virtual bool visit(VariableDeclaration& _node) { return visitNode(_node); } + virtual bool visit(ModifierDefinition& _node) { return visitNode(_node); } + virtual bool visit(ModifierInvocation& _node) { return visitNode(_node); } + virtual bool visit(EventDefinition& _node) { return visitNode(_node); } + virtual bool visit(TypeName& _node) { return visitNode(_node); } + virtual bool visit(ElementaryTypeName& _node) { return visitNode(_node); } + virtual bool visit(UserDefinedTypeName& _node) { return visitNode(_node); } + virtual bool visit(Mapping& _node) { return visitNode(_node); } + virtual bool visit(ArrayTypeName& _node) { return visitNode(_node); } + virtual bool visit(Block& _node) { return visitNode(_node); } + virtual bool visit(PlaceholderStatement& _node) { return visitNode(_node); } + virtual bool visit(IfStatement& _node) { return visitNode(_node); } + virtual bool visit(WhileStatement& _node) { return visitNode(_node); } + virtual bool visit(ForStatement& _node) { return visitNode(_node); } + virtual bool visit(Continue& _node) { return visitNode(_node); } + virtual bool visit(Break& _node) { return visitNode(_node); } + virtual bool visit(Return& _node) { return visitNode(_node); } + virtual bool visit(Throw& _node) { return visitNode(_node); } + virtual bool visit(VariableDeclarationStatement& _node) { return visitNode(_node); } + virtual bool visit(ExpressionStatement& _node) { return visitNode(_node); } + virtual bool visit(Assignment& _node) { return visitNode(_node); } + virtual bool visit(TupleExpression& _node) { return visitNode(_node); } + virtual bool visit(UnaryOperation& _node) { return visitNode(_node); } + virtual bool visit(BinaryOperation& _node) { return visitNode(_node); } + virtual bool visit(FunctionCall& _node) { return visitNode(_node); } + virtual bool visit(NewExpression& _node) { return visitNode(_node); } + virtual bool visit(MemberAccess& _node) { return visitNode(_node); } + virtual bool visit(IndexAccess& _node) { return visitNode(_node); } + virtual bool visit(Identifier& _node) { return visitNode(_node); } + virtual bool visit(ElementaryTypeNameExpression& _node) { return visitNode(_node); } + virtual bool visit(Literal& _node) { return visitNode(_node); } + + virtual void endVisit(SourceUnit& _node) { endVisitNode(_node); } + virtual void endVisit(ImportDirective& _node) { endVisitNode(_node); } + virtual void endVisit(ContractDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(InheritanceSpecifier& _node) { endVisitNode(_node); } + virtual void endVisit(StructDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(EnumDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(EnumValue& _node) { endVisitNode(_node); } + virtual void endVisit(ParameterList& _node) { endVisitNode(_node); } + virtual void endVisit(FunctionDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(VariableDeclaration& _node) { endVisitNode(_node); } + virtual void endVisit(ModifierDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(ModifierInvocation& _node) { endVisitNode(_node); } + virtual void endVisit(EventDefinition& _node) { endVisitNode(_node); } + virtual void endVisit(TypeName& _node) { endVisitNode(_node); } + virtual void endVisit(ElementaryTypeName& _node) { endVisitNode(_node); } + virtual void endVisit(UserDefinedTypeName& _node) { endVisitNode(_node); } + virtual void endVisit(Mapping& _node) { endVisitNode(_node); } + virtual void endVisit(ArrayTypeName& _node) { endVisitNode(_node); } + virtual void endVisit(Block& _node) { endVisitNode(_node); } + virtual void endVisit(PlaceholderStatement& _node) { endVisitNode(_node); } + virtual void endVisit(IfStatement& _node) { endVisitNode(_node); } + virtual void endVisit(WhileStatement& _node) { endVisitNode(_node); } + virtual void endVisit(ForStatement& _node) { endVisitNode(_node); } + virtual void endVisit(Continue& _node) { endVisitNode(_node); } + virtual void endVisit(Break& _node) { endVisitNode(_node); } + virtual void endVisit(Return& _node) { endVisitNode(_node); } + virtual void endVisit(Throw& _node) { endVisitNode(_node); } + virtual void endVisit(VariableDeclarationStatement& _node) { endVisitNode(_node); } + virtual void endVisit(ExpressionStatement& _node) { endVisitNode(_node); } + virtual void endVisit(Assignment& _node) { endVisitNode(_node); } + virtual void endVisit(TupleExpression& _node) { endVisitNode(_node); } + virtual void endVisit(UnaryOperation& _node) { endVisitNode(_node); } + virtual void endVisit(BinaryOperation& _node) { endVisitNode(_node); } + virtual void endVisit(FunctionCall& _node) { endVisitNode(_node); } + virtual void endVisit(NewExpression& _node) { endVisitNode(_node); } + virtual void endVisit(MemberAccess& _node) { endVisitNode(_node); } + virtual void endVisit(IndexAccess& _node) { endVisitNode(_node); } + virtual void endVisit(Identifier& _node) { endVisitNode(_node); } + virtual void endVisit(ElementaryTypeNameExpression& _node) { endVisitNode(_node); } + virtual void endVisit(Literal& _node) { endVisitNode(_node); } + +protected: + /// Generic function called by default for each node, to be overridden by derived classes + /// if behaviour unspecific to a node type is desired. + virtual bool visitNode(ASTNode&) { return true; } + /// Generic function called by default for each node, to be overridden by derived classes + /// if behaviour unspecific to a node type is desired. + virtual void endVisitNode(ASTNode&) { } +}; + +class ASTConstVisitor +{ +public: + virtual bool visit(SourceUnit const& _node) { return visitNode(_node); } + virtual bool visit(ImportDirective const& _node) { return visitNode(_node); } + virtual bool visit(ContractDefinition const& _node) { return visitNode(_node); } + virtual bool visit(InheritanceSpecifier const& _node) { return visitNode(_node); } + virtual bool visit(StructDefinition const& _node) { return visitNode(_node); } + virtual bool visit(EnumDefinition const& _node) { return visitNode(_node); } + virtual bool visit(EnumValue const& _node) { return visitNode(_node); } + virtual bool visit(ParameterList const& _node) { return visitNode(_node); } + virtual bool visit(FunctionDefinition const& _node) { return visitNode(_node); } + virtual bool visit(VariableDeclaration const& _node) { return visitNode(_node); } + virtual bool visit(ModifierDefinition const& _node) { return visitNode(_node); } + virtual bool visit(ModifierInvocation const& _node) { return visitNode(_node); } + virtual bool visit(EventDefinition const& _node) { return visitNode(_node); } + virtual bool visit(TypeName const& _node) { return visitNode(_node); } + virtual bool visit(ElementaryTypeName const& _node) { return visitNode(_node); } + virtual bool visit(UserDefinedTypeName const& _node) { return visitNode(_node); } + virtual bool visit(Mapping const& _node) { return visitNode(_node); } + virtual bool visit(ArrayTypeName const& _node) { return visitNode(_node); } + virtual bool visit(Block const& _node) { return visitNode(_node); } + virtual bool visit(PlaceholderStatement const& _node) { return visitNode(_node); } + virtual bool visit(IfStatement const& _node) { return visitNode(_node); } + virtual bool visit(WhileStatement const& _node) { return visitNode(_node); } + virtual bool visit(ForStatement const& _node) { return visitNode(_node); } + virtual bool visit(Continue const& _node) { return visitNode(_node); } + virtual bool visit(Break const& _node) { return visitNode(_node); } + virtual bool visit(Return const& _node) { return visitNode(_node); } + virtual bool visit(Throw const& _node) { return visitNode(_node); } + virtual bool visit(VariableDeclarationStatement const& _node) { return visitNode(_node); } + virtual bool visit(ExpressionStatement const& _node) { return visitNode(_node); } + virtual bool visit(Assignment const& _node) { return visitNode(_node); } + virtual bool visit(TupleExpression const& _node) { return visitNode(_node); } + virtual bool visit(UnaryOperation const& _node) { return visitNode(_node); } + virtual bool visit(BinaryOperation const& _node) { return visitNode(_node); } + virtual bool visit(FunctionCall const& _node) { return visitNode(_node); } + virtual bool visit(NewExpression const& _node) { return visitNode(_node); } + virtual bool visit(MemberAccess const& _node) { return visitNode(_node); } + virtual bool visit(IndexAccess const& _node) { return visitNode(_node); } + virtual bool visit(Identifier const& _node) { return visitNode(_node); } + virtual bool visit(ElementaryTypeNameExpression const& _node) { return visitNode(_node); } + virtual bool visit(Literal const& _node) { return visitNode(_node); } + + virtual void endVisit(SourceUnit const& _node) { endVisitNode(_node); } + virtual void endVisit(ImportDirective const& _node) { endVisitNode(_node); } + virtual void endVisit(ContractDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(InheritanceSpecifier const& _node) { endVisitNode(_node); } + virtual void endVisit(StructDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(EnumDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(EnumValue const& _node) { endVisitNode(_node); } + virtual void endVisit(ParameterList const& _node) { endVisitNode(_node); } + virtual void endVisit(FunctionDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(VariableDeclaration const& _node) { endVisitNode(_node); } + virtual void endVisit(ModifierDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(ModifierInvocation const& _node) { endVisitNode(_node); } + virtual void endVisit(EventDefinition const& _node) { endVisitNode(_node); } + virtual void endVisit(TypeName const& _node) { endVisitNode(_node); } + virtual void endVisit(ElementaryTypeName const& _node) { endVisitNode(_node); } + virtual void endVisit(UserDefinedTypeName const& _node) { endVisitNode(_node); } + virtual void endVisit(Mapping const& _node) { endVisitNode(_node); } + virtual void endVisit(ArrayTypeName const& _node) { endVisitNode(_node); } + virtual void endVisit(Block const& _node) { endVisitNode(_node); } + virtual void endVisit(PlaceholderStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(IfStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(WhileStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(ForStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(Continue const& _node) { endVisitNode(_node); } + virtual void endVisit(Break const& _node) { endVisitNode(_node); } + virtual void endVisit(Return const& _node) { endVisitNode(_node); } + virtual void endVisit(Throw const& _node) { endVisitNode(_node); } + virtual void endVisit(VariableDeclarationStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(ExpressionStatement const& _node) { endVisitNode(_node); } + virtual void endVisit(Assignment const& _node) { endVisitNode(_node); } + virtual void endVisit(TupleExpression const& _node) { endVisitNode(_node); } + virtual void endVisit(UnaryOperation const& _node) { endVisitNode(_node); } + virtual void endVisit(BinaryOperation const& _node) { endVisitNode(_node); } + virtual void endVisit(FunctionCall const& _node) { endVisitNode(_node); } + virtual void endVisit(NewExpression const& _node) { endVisitNode(_node); } + virtual void endVisit(MemberAccess const& _node) { endVisitNode(_node); } + virtual void endVisit(IndexAccess const& _node) { endVisitNode(_node); } + virtual void endVisit(Identifier const& _node) { endVisitNode(_node); } + virtual void endVisit(ElementaryTypeNameExpression const& _node) { endVisitNode(_node); } + virtual void endVisit(Literal const& _node) { endVisitNode(_node); } + +protected: + /// Generic function called by default for each node, to be overridden by derived classes + /// if behaviour unspecific to a node type is desired. + virtual bool visitNode(ASTNode const&) { return true; } + /// Generic function called by default for each node, to be overridden by derived classes + /// if behaviour unspecific to a node type is desired. + virtual void endVisitNode(ASTNode const&) { } +}; + +/** + * Utility class that accepts std::functions and calls them for visitNode and endVisitNode. + */ +class SimpleASTVisitor: public ASTConstVisitor +{ +public: + SimpleASTVisitor( + std::function<bool(ASTNode const&)> _onVisit, + std::function<void(ASTNode const&)> _onEndVisit + ): m_onVisit(_onVisit), m_onEndVisit(_onEndVisit) {} + +protected: + virtual bool visitNode(ASTNode const& _n) override { return m_onVisit ? m_onVisit(_n) : true; } + virtual void endVisitNode(ASTNode const& _n) override { m_onEndVisit(_n); } + +private: + std::function<bool(ASTNode const&)> m_onVisit; + std::function<void(ASTNode const&)> m_onEndVisit; +}; + +/** + * Utility class that visits the AST in depth-first order and calls a function on each node and each edge. + * Child nodes are only visited if the node callback of the parent returns true. + * The node callback of a parent is called before any edge or node callback involving the children. + * The edge callbacks of all children are called before the edge callback of the parent. + * This way, the node callback can be used as an initializing callback and the edge callbacks can be + * used to compute a "reduce" function. + */ +class ASTReduce: public ASTConstVisitor +{ +public: + /** + * Constructs a new ASTReduce object with the given callback functions. + * @param _onNode called for each node, before its child edges and nodes, should return true to descend deeper + * @param _onEdge called for each edge with (parent, child) + */ + ASTReduce( + std::function<bool(ASTNode const&)> _onNode, + std::function<void(ASTNode const&, ASTNode const&)> _onEdge + ): m_onNode(_onNode), m_onEdge(_onEdge) + { + } + +protected: + bool visitNode(ASTNode const& _node) override + { + m_parents.push_back(&_node); + return m_onNode(_node); + } + void endVisitNode(ASTNode const& _node) override + { + m_parents.pop_back(); + if (!m_parents.empty()) + m_onEdge(*m_parents.back(), _node); + } + +private: + std::vector<ASTNode const*> m_parents; + std::function<bool(ASTNode const&)> m_onNode; + std::function<void(ASTNode const&, ASTNode const&)> m_onEdge; +}; + +} +} |