C# VariableDeclaratorSyntax类代码示例

        internal SourceMemberFieldSymbol(
            SourceMemberContainerTypeSymbol containingType,
            VariableDeclaratorSyntax declarator,
            DeclarationModifiers modifiers,
            bool modifierErrors,
            DiagnosticBag diagnostics)
            : base(containingType, declarator.Identifier.ValueText, declarator.GetReference(), declarator.Identifier.GetLocation())
        {
            this.modifiers = modifiers;

            this.CheckAccessibility(diagnostics);

            var location = Location;
            if (modifierErrors)
            {
                // skip the following checks
            }
            else if (containingType.IsSealed && (DeclaredAccessibility == Accessibility.Protected || DeclaredAccessibility == Accessibility.ProtectedOrInternal))
            {
                diagnostics.Add(AccessCheck.GetProtectedMemberInSealedTypeError(containingType), location, this);
            }
            else if (IsVolatile && IsReadOnly)
            {
                diagnostics.Add(ErrorCode.ERR_VolatileAndReadonly, location, this);
            }
            else if (containingType.IsStatic && !IsStatic)
            {
                diagnostics.Add(ErrorCode.ERR_InstanceMemberInStaticClass, location, this);
            }

            // TODO: Consider checking presence of core type System.Runtime.CompilerServices.IsVolatile 
            // if there is a volatile modifier. Perhaps an appropriate error should be reported if the 
            // type isn’t available.
        }

 private static TypeDeclarationSyntax AddDisposeDeclarationToDisposeMethod(VariableDeclaratorSyntax variableDeclarator, TypeDeclarationSyntax type, INamedTypeSymbol typeSymbol)
 {
     var disposableMethod = typeSymbol.GetMembers("Dispose").OfType<IMethodSymbol>().FirstOrDefault(d => d.Arity == 0);
     var disposeStatement = SyntaxFactory.ParseStatement($"{variableDeclarator.Identifier.ToString()}.Dispose();");
     TypeDeclarationSyntax newType;
     if (disposableMethod == null)
     {
         var disposeMethod = SyntaxFactory.MethodDeclaration(SyntaxFactory.PredefinedType(SyntaxFactory.Token(SyntaxKind.VoidKeyword)), "Dispose")
               .WithModifiers(SyntaxFactory.TokenList(SyntaxFactory.Token(SyntaxKind.PublicKeyword)))
               .WithBody(SyntaxFactory.Block(disposeStatement))
               .WithAdditionalAnnotations(Formatter.Annotation);
         newType = ((dynamic)type).AddMembers(disposeMethod);
     }
     else
     {
         var existingDisposeMethod = (MethodDeclarationSyntax)disposableMethod.DeclaringSyntaxReferences.FirstOrDefault()?.GetSyntax();
         if (type.Members.Contains(existingDisposeMethod))
         {
             var newDisposeMethod = existingDisposeMethod.AddBodyStatements(disposeStatement)
                 .WithAdditionalAnnotations(Formatter.Annotation);
             newType = type.ReplaceNode(existingDisposeMethod, newDisposeMethod);
         }
         else
         {
             //we will simply anotate the code for now, but ideally we would change another document
             //for this to work we have to be able to fix more than one doc
             var fieldDeclaration = variableDeclarator.Parent.Parent;
             var newFieldDeclaration = fieldDeclaration.WithTrailingTrivia(SyntaxFactory.ParseTrailingTrivia($"//add {disposeStatement.ToString()} to the Dispose method on another file.").AddRange(fieldDeclaration.GetTrailingTrivia()))
                 .WithLeadingTrivia(fieldDeclaration.GetLeadingTrivia());
             newType = type.ReplaceNode(fieldDeclaration, newFieldDeclaration);
         }
     }
     return newType;
 }

		/// <summary>
		///   Normalizes the <paramref name="declaration" />.
		/// </summary>
		public override SyntaxNode VisitVariableDeclarator(VariableDeclaratorSyntax declaration)
		{
			var objectCreation = declaration?.Initializer?.Value as ObjectCreationExpressionSyntax;
			if (objectCreation == null)
				return declaration;

			var symbol = SemanticModel.GetDeclaredSymbol(declaration);
			if (symbol == null)
				return declaration;

			ITypeSymbol type;
			string name;

			switch (symbol.Kind)
			{
				case SymbolKind.Field:
					var fieldSymbol = ((IFieldSymbol)symbol);
					type = fieldSymbol.Type;
					name = fieldSymbol.Name;
					break;
				case SymbolKind.Local:
					var localSymbol = ((ILocalSymbol)symbol);
					type = localSymbol.Type;
					name = localSymbol.Name;
					break;
				default:
					return declaration;
			}

			var fault = SemanticModel.GetTypeSymbol<Fault>();
			if (!type.Equals(fault) && !type.IsDerivedFrom(fault))
				return declaration;

			return declaration.WithInitializer(declaration.Initializer.WithValue(AddNameInitializer(fault, objectCreation, name)));
		}

        public override SyntaxNode VisitVariableDeclarator(VariableDeclaratorSyntax node)
        {
            if (node.Identifier.ToString() == renameFrom.ToString())
                node = node.WithIdentifier(renameTo);

            return base.VisitVariableDeclarator(node);
        }

        private async Task<Document> UseDeclarationExpression(Document document, ArgumentSyntax argument, VariableDeclaratorSyntax declarator,
              CancellationToken cancellationToken)
        {
            // get variable declaration
            var declaration = declarator.Parent;

            // get statement which contains both local declaration statement and method call with out argument
            var statement = DiagnosticAnalyzer.GetContainingStatement(declaration.Parent);

            // remove entire local declaration statement or just single variable declaration
            // depending on how many variables are declared within single local declaration statement
            var nodeToRemove = declaration.ChildNodes().OfType<VariableDeclaratorSyntax>().Count() > 1 ? declarator : declaration.Parent;
            var newStatement = statement.RemoveNode(nodeToRemove, SyntaxRemoveOptions.KeepEndOfLine);

            // get variable type
            var type = declaration.ChildNodes().First() as TypeSyntax;
            // create new Declaration Expression using variable type and declarator
            var newDeclarationExpression = SyntaxFactory.DeclarationExpression(type, declarator);
            // fix the trivia aroung Declaration Expression
            var firstToken = newDeclarationExpression.GetFirstToken();
            var leadingTrivia = firstToken.LeadingTrivia;
            var trimmedDeclarationExpression = newDeclarationExpression.ReplaceToken(firstToken, firstToken.WithLeadingTrivia(SyntaxTriviaList.Empty));
            // get ArgumentSyntax from newStatement which is equivalent to argument from original syntax tree
            var newArgument = newStatement.DescendantNodes()
                                          .FirstOrDefault(n => n.IsEquivalentTo(argument));
            // replace argument with new version, containing Declaration Expression
            newStatement = newStatement.ReplaceNode(newArgument.ChildNodes().First(), trimmedDeclarationExpression);

            // get root for current document and replace statement with new version
            var root = await document.GetSyntaxRootAsync(cancellationToken);
            var newRoot = root.ReplaceNode(statement, newStatement);

            // return document with modified syntax
            return document.WithSyntaxRoot(newRoot);
        }

 internal FieldMemberBuilder(NamedTypeSymbol owner, Binder enclosing, FieldDeclarationSyntax declaration, TypeSymbol type, VariableDeclaratorSyntax declarator)
     : base(enclosing.Location(declarator) as SourceLocation, owner, enclosing)
 {
     this.owner = owner;
     this.declaration = declaration;
     this.declarator = declarator;
     this.Type = type;
 }

 protected override void CompileDefaultInitialization(VariableDeclaratorSyntax declarator, TypeSyntax type)
 {
     Write("=");
     Write(Space);
     Write("(");
     CompileExpression(type);
     Write(")0");
 }

        public override SyntaxNode VisitVariableDeclarator(VariableDeclaratorSyntax node)
        {
            var substitution = result.Find(node);

            return substitution != null
                                ? substitution.Substitute()
                                : base.VisitVariableDeclarator(node);
        }

 /// <summary>
 /// Returns true if the given expression flows in the target.
 /// </summary>
 /// <param name="variable">Variable</param>
 /// <param name="target">Target</param>
 /// <param name="syntaxNode">SyntaxNode</param>
 /// <param name="cfgNode">ControlFlowGraphNode</param>
 /// <param name="targetSyntaxNode">Target syntaxNode</param>
 /// <param name="targetCfgNode">Target controlFlowGraphNode</param>
 /// <param name="model">SemanticModel</param>
 /// <returns>Boolean</returns>
 internal static bool FlowsIntoTarget(VariableDeclaratorSyntax variable, ISymbol target,
     SyntaxNode syntaxNode, ControlFlowGraphNode cfgNode, SyntaxNode targetSyntaxNode,
     ControlFlowGraphNode targetCfgNode, SemanticModel model)
 {
     ISymbol reference = model.GetDeclaredSymbol(variable);
     return DataFlowAnalysis.FlowsIntoTarget(reference, target, syntaxNode,
         cfgNode, targetSyntaxNode, targetCfgNode);
 }

        private void TypeChecks(TypeSymbol type, BaseFieldDeclarationSyntax fieldSyntax, VariableDeclaratorSyntax declarator, DiagnosticBag diagnostics)
        {
            if (type.IsStatic)
            {
                // Cannot declare a variable of static type '{0}'
                diagnostics.Add(ErrorCode.ERR_VarDeclIsStaticClass, this.Location, type);
            }
            else if (type.SpecialType == SpecialType.System_Void)
            {
                diagnostics.Add(ErrorCode.ERR_FieldCantHaveVoidType, fieldSyntax.Declaration.Type.Location);
            }
            else if (type.IsRestrictedType())
            {
                diagnostics.Add(ErrorCode.ERR_FieldCantBeRefAny, fieldSyntax.Declaration.Type.Location, type);
            }
            else if (IsConst && !type.CanBeConst())
            {
                SyntaxToken constToken = default(SyntaxToken);
                foreach (var modifier in fieldSyntax.Modifiers)
                {
                    if (modifier.CSharpKind() == SyntaxKind.ConstKeyword)
                    {
                        constToken = modifier;
                        break;
                    }
                }
                Debug.Assert(constToken.CSharpKind() == SyntaxKind.ConstKeyword);

                diagnostics.Add(ErrorCode.ERR_BadConstType, constToken.GetLocation(), type);
            }
            else
            {
                if (ContainingType.TypeKind == TypeKind.Struct && !IsStatic && !IsConst)
                {
                    var initializerOpt = declarator.Initializer;
                    if (initializerOpt != null)
                    {
                        // '{0}': cannot have instance field initializers in structs
                        diagnostics.Add(ErrorCode.ERR_FieldInitializerInStruct, this.Location, this);
                    }
                }

                if (IsVolatile && !type.IsValidVolatileFieldType())
                {
                    // '{0}': a volatile field cannot be of the type '{1}'
                    diagnostics.Add(ErrorCode.ERR_VolatileStruct, this.Location, this, type);
                }
            }

            HashSet<DiagnosticInfo> useSiteDiagnostics = null;
            if (!this.IsNoMoreVisibleThan(type, ref useSiteDiagnostics))
            {
                // Inconsistent accessibility: field type '{1}' is less accessible than field '{0}'
                diagnostics.Add(ErrorCode.ERR_BadVisFieldType, this.Location, this, type);
            }

            diagnostics.Add(this.Location, useSiteDiagnostics);
        }

 internal static BoundStatement AddSequencePoint(VariableDeclaratorSyntax declaratorSyntax, BoundStatement rewrittenStatement)
 {
     SyntaxNode node;
     TextSpan? part;
     GetBreakpointSpan(declaratorSyntax, out node, out part);
     var result = BoundSequencePoint.Create(declaratorSyntax, part, rewrittenStatement);
     result.WasCompilerGenerated = rewrittenStatement.WasCompilerGenerated;
     return result;
 }

        public static string GetDescription(this VariableDeclarationSyntax declaration, VariableDeclaratorSyntax declarator)
        {
            var result = new StringBuilder();

            result.Append(declaration.Type.ToStringIgnoringMacroReferences());
            result.Append(" ");
            result.Append(declarator.Identifier.GetFullyQualifiedName());

            return result.ToString().Replace(Environment.NewLine, string.Empty);
        }

 private static PropertyDeclarationSyntax GetSimpleProperty(PropertyDeclarationSyntax property, VariableDeclaratorSyntax variableDeclarator)
 {
     var simpleGetSetPropetie = property.WithAccessorList(SyntaxFactory.AccessorList(SyntaxFactory.List(new[] {
             SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration).WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken)),
             SyntaxFactory.AccessorDeclaration(SyntaxKind.SetAccessorDeclaration).WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken))
         })));
     return variableDeclarator.Initializer == null ?
         simpleGetSetPropetie :
         simpleGetSetPropetie.WithInitializer(variableDeclarator.Initializer)
             .WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken));
 }

        public override void VisitVariableDeclarator(VariableDeclaratorSyntax node)
        {
            if (node.Ancestors().Any(x => x is FunctionDefinitionSyntax))
                CreateTag(node.Identifier, _classificationService.LocalVariableIdentifier);
            else if (node.Ancestors().Any(x => x is TypeDefinitionSyntax))
                CreateTag(node.Identifier, _classificationService.FieldIdentifier);
            else
                CreateTag(node.Identifier, _classificationService.GlobalVariableIdentifier);

            base.VisitVariableDeclarator(node);
        }

		private async Task<Document> MakeParameterAsync(Document document, VariableDeclaratorSyntax typeDecl, CancellationToken cancellationToken)
		{
			var root = await document.GetSyntaxRootAsync(cancellationToken);
			string varKeyword = string.Empty, varName = string.Empty;

			//Predefined variable type (string, int, etc...)
			var preDefType = typeDecl.Parent.ChildNodes().OfType<PredefinedTypeSyntax>().FirstOrDefault();
			if (preDefType != null)
			{
				varKeyword = preDefType.Keyword.ToString();
				var varDecl = typeDecl.Parent.ChildNodes().OfType<VariableDeclaratorSyntax>().FirstOrDefault();
				varName = varDecl?.Identifier.ToString();
			}
			else //var
			{
				var identName = typeDecl.Parent.ChildNodes().OfType<IdentifierNameSyntax>().FirstOrDefault();

				//Access the semantic model to determine actual type
				var model = document.GetSemanticModelAsync().Result;
                var type = model.GetTypeInfo(identName).Type;
				varKeyword = type.ToMinimalDisplayString(model, typeDecl.SpanStart);

				var varDecl = typeDecl.Parent.ChildNodes().OfType<VariableDeclaratorSyntax>().FirstOrDefault();
				varName = varDecl?.Identifier.ToString();
			}

			MethodDeclarationSyntax mds = typeDecl.Ancestors().OfType<MethodDeclarationSyntax>().FirstOrDefault();

			//Add the existing and new parameters
			ParameterSyntax ps = SyntaxFactory.Parameter(SyntaxFactory.Identifier(string.Concat(varKeyword, " ", varName)));
			var newList = SyntaxFactory.ParameterList(SyntaxFactory.SeparatedList<ParameterSyntax>().AddRange(
				mds.ParameterList.ChildNodes().OfType<ParameterSyntax>()).Add(ps));

			var methodNode = typeDecl.Ancestors().OfType<MethodDeclarationSyntax>().FirstOrDefault();
			var variableNode = typeDecl.Parent.Parent;
			var variableParentNode = typeDecl.Parent.Parent.Parent;

			//Track the nodes we'll be using 
			var newRoot = root.TrackNodes(methodNode, variableNode, variableParentNode);

			//Remode/replace the variable declaration
			var trackedVariableParentNode = newRoot.GetCurrentNode(variableParentNode);
			var trackedVariableNode = newRoot.GetCurrentNode(variableNode);
			var newVariableParentNode = trackedVariableParentNode.RemoveNode(trackedVariableNode, SyntaxRemoveOptions.KeepNoTrivia);
			newRoot = newRoot.ReplaceNode(trackedVariableParentNode, newVariableParentNode);

			//Replace the method parameters
			var trackedMethodNode = newRoot.GetCurrentNode(methodNode);
			var newMethodNode = trackedMethodNode.ReplaceNode(trackedMethodNode.ParameterList, newList);
			newRoot = newRoot.ReplaceNode(trackedMethodNode, newMethodNode);

			return document.WithSyntaxRoot(newRoot);
		}