Preparing the ground for AST outputing to JSON

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+/*
+    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 Lefteris <lefteris@ethdev.com>
+ * @date 2015
+ * Converts the AST into json format
+ */
+
+#pragma once
+
+#include <ostream>
+#include <libsolidity/ASTVisitor.h>
+#include <jsoncpp/json/json.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Converter of the AST into JSON format
+ */
+class ASTJsonConverter: public ASTConstVisitor
+{
+public:
+	/// Create a converter for the given abstract syntax tree. If the source is specified,
+	/// the corresponding parts of the source are printed with each node.
+	ASTJsonConverter(ASTNode const& _ast);
+	/// Output the json representation of the AST to _stream.
+	void print(std::ostream& _stream);
+
+	bool visit(ImportDirective const& _node) override;
+	bool visit(ContractDefinition const& _node) override;
+	bool visit(StructDefinition const& _node) override;
+	bool visit(ParameterList const& _node) override;
+	bool visit(FunctionDefinition const& _node) override;
+	bool visit(VariableDeclaration const& _node) override;
+	bool visit(TypeName const& _node) override;
+	bool visit(ElementaryTypeName const& _node) override;
+	bool visit(UserDefinedTypeName const& _node) override;
+	bool visit(Mapping const& _node) override;
+	bool visit(Statement const& _node) override;
+	bool visit(Block const& _node) override;
+	bool visit(IfStatement const& _node) override;
+	bool visit(BreakableStatement const& _node) override;
+	bool visit(WhileStatement const& _node) override;
+	bool visit(ForStatement const& _node) override;
+	bool visit(Continue const& _node) override;
+	bool visit(Break const& _node) override;
+	bool visit(Return const& _node) override;
+	bool visit(VariableDefinition const& _node) override;
+	bool visit(ExpressionStatement const& _node) override;
+	bool visit(Expression const& _node) override;
+	bool visit(Assignment const& _node) override;
+	bool visit(UnaryOperation const& _node) override;
+	bool visit(BinaryOperation const& _node) override;
+	bool visit(FunctionCall const& _node) override;
+	bool visit(NewExpression const& _node) override;
+	bool visit(MemberAccess const& _node) override;
+	bool visit(IndexAccess const& _node) override;
+	bool visit(PrimaryExpression const& _node) override;
+	bool visit(Identifier const& _node) override;
+	bool visit(ElementaryTypeNameExpression const& _node) override;
+	bool visit(Literal const& _node) override;
+
+	void endVisit(ImportDirective const&) override;
+	void endVisit(ContractDefinition const&) override;
+	void endVisit(StructDefinition const&) override;
+	void endVisit(ParameterList const&) override;
+	void endVisit(FunctionDefinition const&) override;
+	void endVisit(VariableDeclaration const&) override;
+	void endVisit(TypeName const&) override;
+	void endVisit(ElementaryTypeName const&) override;
+	void endVisit(UserDefinedTypeName const&) override;
+	void endVisit(Mapping const&) override;
+	void endVisit(Statement const&) override;
+	void endVisit(Block const&) override;
+	void endVisit(IfStatement const&) override;
+	void endVisit(BreakableStatement const&) override;
+	void endVisit(WhileStatement const&) override;
+	void endVisit(ForStatement const&) override;
+	void endVisit(Continue const&) override;
+	void endVisit(Break const&) override;
+	void endVisit(Return const&) override;
+	void endVisit(VariableDefinition const&) override;
+	void endVisit(ExpressionStatement const&) override;
+	void endVisit(Expression const&) override;
+	void endVisit(Assignment const&) override;
+	void endVisit(UnaryOperation const&) override;
+	void endVisit(BinaryOperation const&) override;
+	void endVisit(FunctionCall const&) override;
+	void endVisit(NewExpression const&) override;
+	void endVisit(MemberAccess const&) override;
+	void endVisit(IndexAccess const&) override;
+	void endVisit(PrimaryExpression const&) override;
+	void endVisit(Identifier const&) override;
+	void endVisit(ElementaryTypeNameExpression const&) override;
+	void endVisit(Literal const&) override;
+
+private:
+	void addJsonNode(std::string const& _typeName,
+					 std::initializer_list<std::pair<std::string const, std::string const>> _list);
+	void printType(Expression const& _expression);
+	bool goDeeper() { return true; }
+
+	Json::Value m_astJson;
+	Json::Value *m_childrenPtr;
+	std::string m_source;
+	ASTNode const* m_ast;
+};
+
+}
+}