public static SyntaxNode IntroduceFieldFromConstructorAsync(SyntaxNode root, ConstructorDeclarationSyntax constructorStatement, ParameterSyntax parameter)
{
var oldClass = constructorStatement.FirstAncestorOrSelf <ClassDeclarationSyntax>();
var newClass = oldClass;
var fieldMembers = oldClass.Members.OfType <FieldDeclarationSyntax>();
var fieldName = parameter.Identifier.ValueText;
if (!fieldMembers.Any(p => p.Declaration.Variables.First().Identifier.Text == fieldName && p.Declaration.Type.ToString() == parameter.Type.ToString()))
{
var identifierPostFix = 0;
while (fieldMembers.Any(p => p.Declaration.Variables.Any(d => d.Identifier.Text == fieldName)))
{
fieldName = parameter.Identifier.ValueText + ++identifierPostFix;
}
var newField = SyntaxFactory.FieldDeclaration(SyntaxFactory.VariableDeclaration(parameter.Type)
.WithVariables(SyntaxFactory.SingletonSeparatedList(SyntaxFactory.VariableDeclarator(SyntaxFactory.Identifier(fieldName)))))
.WithModifiers(SyntaxFactory.TokenList(new[] { SyntaxFactory.Token(SyntaxKind.PrivateKeyword), SyntaxFactory.Token(SyntaxKind.ReadOnlyKeyword) }))
.WithAdditionalAnnotations(Formatter.Annotation);
newClass = newClass.WithMembers(newClass.Members.Insert(0, newField)).WithoutAnnotations(Formatter.Annotation);
}
var assignmentField = SyntaxFactory.ExpressionStatement(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression,
SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, SyntaxFactory.ThisExpression(),
SyntaxFactory.IdentifierName(fieldName)), SyntaxFactory.IdentifierName(parameter.Identifier.ValueText)));
var newConstructor = constructorStatement.WithBody(constructorStatement.Body.AddStatements(assignmentField));
newClass = newClass.ReplaceNode(newClass.DescendantNodes().OfType <ConstructorDeclarationSyntax>().First(), newConstructor);
var newRoot = root.ReplaceNode(oldClass, newClass);
return(newRoot);
}
public override void VisitConstructorDeclaration(ConstructorDeclarationSyntax node)
{
var containingTypeSyntax = node.FirstAncestorOrSelf <TypeDeclarationSyntax>();
var methodSymbol = this.SemanticModel.GetDeclaredSymbol(node);
this.ProcessMethodDecl(node, containingTypeSyntax, methodSymbol);
base.VisitConstructorDeclaration(node);
}
public CodeRefactoring GetRefactoring(IDocument document, TextSpan textSpan, CancellationToken cancellationToken)
{
SyntaxNode root = (SyntaxNode)document.GetSyntaxRoot(cancellationToken);
SyntaxToken token = root.FindToken(textSpan.Start, findInsideTrivia: true);
// Verify is the selected token an identifier
if (token.Kind == SyntaxKind.IdentifierToken && token.Span.Start <= textSpan.End && textSpan.End <= token.Span.End)
{
ISemanticModel model = document.GetSemanticModel(cancellationToken);
CommonSyntaxNode parentNode = token.Parent;
// Verify that the selected node is an identifier of constructor
if (!(parentNode is ConstructorDeclarationSyntax))
{
return(null);
}
ConstructorDeclarationSyntax ctorDeclaration = (ConstructorDeclarationSyntax)parentNode;
if (ctorDeclaration.HasDiagnostics)
{
return(null);
}
// This refactoring does not apply to static constructors
if (ctorDeclaration.Modifiers.Any(m => m.Kind == SyntaxKind.StaticKeyword))
{
return(null);
}
// Get the containing type
ClassDeclarationSyntax typeDeclaration = ctorDeclaration.FirstAncestorOrSelf <ClassDeclarationSyntax>();
if (typeDeclaration == null)
{
return(null);
}
return(new CodeRefactoring(
new[] { new ReplaceConstructorWithFactoryMethodAction(document, ctorDeclaration, typeDeclaration) },
token.Span));
}
return(null);
}
private async Task <ConstructorDeclarationSyntax> DocumentConstructorAsync(CodeFixContext context, ConstructorDeclarationSyntax constructor, CancellationToken cancellationToken)
{
if (constructor == null)
{
return(null);
}
SemanticModel semanticModel = await context.Document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
INamedTypeSymbol apiCallClass = semanticModel.GetDeclaredSymbol(constructor.FirstAncestorOrSelf <ClassDeclarationSyntax>(), cancellationToken);
string parameterName = constructor.ParameterList.Parameters[0].Identifier.ValueText;
DocumentationCommentTriviaSyntax documentationComment = XmlSyntaxFactory.DocumentationComment(
XmlSyntaxFactory.SummaryElement(
XmlSyntaxFactory.Text("Initializes a new instance of the "),
XmlSyntaxFactory.SeeElement(SyntaxFactory.TypeCref(SyntaxFactory.ParseTypeName(apiCallClass.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)))),
XmlSyntaxFactory.Text(" class"),
XmlSyntaxFactory.NewLine(),
XmlSyntaxFactory.Text("with the behavior provided by another "),
XmlSyntaxFactory.SeeElement(SyntaxFactory.TypeCref(SyntaxFactory.ParseTypeName("global::OpenStack.Net.IHttpApiCall<T>"))),
XmlSyntaxFactory.Text(" instance.")),
XmlSyntaxFactory.NewLine(),
XmlSyntaxFactory.ParamElement(
parameterName,
XmlSyntaxFactory.List(
XmlSyntaxFactory.Text("The "),
XmlSyntaxFactory.SeeElement(SyntaxFactory.TypeCref(SyntaxFactory.ParseTypeName("global::OpenStack.Net.IHttpApiCall<T>"))),
XmlSyntaxFactory.Text(" providing the behavior for the API call."))),
XmlSyntaxFactory.NewLine(),
XmlSyntaxFactory.ExceptionElement(
SyntaxFactory.TypeCref(SyntaxFactory.ParseTypeName("global::System.ArgumentNullException")),
XmlSyntaxFactory.List(
XmlSyntaxFactory.Text("If "),
XmlSyntaxFactory.ParamRefElement(parameterName),
XmlSyntaxFactory.Text(" is "),
XmlSyntaxFactory.NullKeywordElement(),
XmlSyntaxFactory.Text("."))))
.WithAdditionalAnnotations(Simplifier.Annotation);
SyntaxTrivia documentationTrivia = SyntaxFactory.Trivia(documentationComment);
return(constructor.WithLeadingTrivia(constructor.GetLeadingTrivia().Add(documentationTrivia)));
}
public static SyntaxNode IntroduceFieldFromConstructor(SyntaxNode root, ConstructorDeclarationSyntax constructorStatement, ParameterSyntax parameter)
{
// There are no constructors in interfaces, therefore all types remaining type (class and struct) are fine.
var oldType = constructorStatement.FirstAncestorOrSelf <TypeDeclarationSyntax>();
var newType = oldType;
var fieldName = parameter.Identifier.ValueText;
var fieldType = parameter.Type;
var members = ExtractMembersFromClass(oldType.Members);
var addMember = false;
if (!members.Any(p => p.Key == fieldName && p.Value == fieldType.ToString()))
{
var identifierPostFix = 0;
while (members.Any(p => p.Key == fieldName))
{
fieldName = parameter.Identifier.ValueText + ++identifierPostFix;
}
addMember = true;
}
var assignmentField = SyntaxFactory.ExpressionStatement(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression,
SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, SyntaxFactory.ThisExpression(),
SyntaxFactory.IdentifierName(fieldName)), SyntaxFactory.IdentifierName(parameter.Identifier.ValueText)));
var newConstructor = constructorStatement.WithBody(constructorStatement.Body.AddStatements(assignmentField));
newType = newType.ReplaceNode(constructorStatement, newConstructor);
if (addMember)
{
var newField = SyntaxFactory.FieldDeclaration(SyntaxFactory.VariableDeclaration(parameter.Type)
.WithVariables(SyntaxFactory.SingletonSeparatedList(SyntaxFactory.VariableDeclarator(SyntaxFactory.Identifier(fieldName)))))
.WithModifiers(SyntaxFactory.TokenList(new[] { SyntaxFactory.Token(SyntaxKind.PrivateKeyword), SyntaxFactory.Token(SyntaxKind.ReadOnlyKeyword) }))
.WithAdditionalAnnotations(Formatter.Annotation);
newType = newType.WithMembers(newType.Members.Insert(0, newField)).WithoutAnnotations(Formatter.Annotation);
}
var newRoot = root.ReplaceNode(oldType, newType);
return(newRoot);
}