C# ReturnStatement.AddChild方法代码示例

			public override object Visit (Return returnStatement)
			{
				var result = new ReturnStatement ();
				
				result.AddChild (new CSharpTokenNode (Convert (returnStatement.loc), "return".Length), ReturnStatement.Roles.Keyword);
				if (returnStatement.Expr != null)
					result.AddChild ((INode)returnStatement.Expr.Accept (this), ReturnStatement.Roles.Expression);
				
				var location = LocationsBag.GetLocations (returnStatement);
				if (location != null)
					result.AddChild (new CSharpTokenNode (Convert (location[0]), 1), ReturnStatement.Roles.Semicolon);
				
				return result;
			}

        // IMPORTANT NOTE:
        // The grammar consists of a few LALR(1) conflicts. These issues are, however, correctly handled, due to the fact that the grammar 
        // is defined in a specific order making the already added parser actions have precedence over the other.
        //
        // Known conflicts that are correctly handled:
        //
        // - ELSE:          Shift/Reduce conflict Dangling ELSE problem.  Lots of articles are around on the internet. 
        //                  The shift action is taken here.
        //
        // - CLOSE_PARENS:  Shift/Reduce conflict. This is due to the fact that the explicit cast expression is like the parenthesized 
        //                  expression. The shift action is taken here.
        //
        // - STAR:          Reduce/Reduce conflict, between VariableType -> TypeNameExpression and PrimaryExpression -> TypeNameExpression, 
        //                  due to the fact variable types can have '*', and look therefore like a binary operator expression. 
        //                  The first reduce action is taken here.

        public CSharpGrammar()
        {
            // Please let me know if there is a better way of tidying this :s

            TokenMapping.Add((int)ERROR, Error);

            #region Definitions to use later

            var statementList = new GrammarDefinition("StatementList");
            var statementListOptional = new GrammarDefinition("StatementListOptional",
                rule: null
                      | statementList);

            var blockStatement = new GrammarDefinition("BlockStatement");

            var variableDeclarator = new GrammarDefinition("VariableDeclarator");
            var variableDeclaratorList = new GrammarDefinition("VariableDeclaratorList");
            variableDeclaratorList.Rule = variableDeclarator
                                          | variableDeclaratorList
                                          + ToElement(COMMA)
                                          + variableDeclarator;
            var variableDeclaration = new GrammarDefinition("VariableDeclaration");
            var variableInitializer = new GrammarDefinition("VariableInitializer");
            var arrayInitializer = new GrammarDefinition("ArrayInitializer");
            var arrayInitializerOptional = new GrammarDefinition("ArrayInitializerOptional",
                rule: null | arrayInitializer);
            var identifierInsideBody = new GrammarDefinition("IdentifierInsideBody",
                rule: ToElement(IDENTIFIER),
                createNode: node => ToIdentifier(node.Children[0].Result));
            var identifierInsideBodyOptional = new GrammarDefinition("IdentifierInsideBodyOptional",
                rule: null | identifierInsideBody);

            variableDeclarator.Rule = identifierInsideBody
                                      | identifierInsideBody
                                      + ToElement(EQUALS)
                                      + variableInitializer;
            variableDeclarator.ComputeResult = node =>
            {
                var result = new VariableDeclarator((Identifier) node.Children[0].Result);
                if (node.Children.Count > 1)
                {
                    result.OperatorToken = (AstToken) node.Children[1].Result;
                    result.Value = (Expression) node.Children[2].Result;
                }
                return result;
            };

            var typeReference = new GrammarDefinition("TypeReference");

            var identifierExpression = new GrammarDefinition("IdentifierExpression",
                rule: identifierInsideBody,
                createNode: node => new IdentifierExpression((Identifier) node.Children[0].Result));

            var usingDirectiveListOptional = new GrammarDefinition("UsingDirectiveListOptional");

            #endregion

            #region Type References

            var namespaceOrTypeExpression = new GrammarDefinition("NamespaceOrTypeExpression");

            namespaceOrTypeExpression.Rule = identifierExpression |
                                             namespaceOrTypeExpression
                                             + ToElement(DOT)
                                             + ToElement(IDENTIFIER);

            namespaceOrTypeExpression.ComputeResult = node =>
            {
                if (node.Children.Count == 1)
                    return ToTypeReference((IConvertibleToType) node.Children[0].Result);
                var result = new MemberTypeReference();
                result.Target = (TypeReference) node.Children[0].Result;
                result.AddChild(AstNodeTitles.Accessor, node.Children[1].Result);
                result.Identifier = ToIdentifier(node.Children[2].Result);
                return result;
            };

            ComputeResultDelegate createPrimitiveTypeExpression = node =>
            {
                if (node.Children[0].Result is PrimitiveTypeReference)
                    return node.Children[0].Result;
                return new PrimitiveTypeReference
                {
                    Identifier = ToIdentifier(node.Children[0].Result),
//.........这里部分代码省略.........