public static async Task <Document> RefactorAsync(
Document document,
PropertyDeclarationSyntax propertyDeclaration,
bool prefixIdentifierWithUnderscore = true,
CancellationToken cancellationToken = default(CancellationToken))
{
SyntaxNode oldRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
string fieldName = TextUtility.ToCamelCase(
propertyDeclaration.Identifier.ValueText,
prefixWithUnderscore: prefixIdentifierWithUnderscore);
FieldDeclarationSyntax fieldDeclaration = CreateBackingField(propertyDeclaration, fieldName)
.WithFormatterAnnotation();
PropertyDeclarationSyntax newPropertyDeclaration = ExpandPropertyAndAddBackingField(propertyDeclaration, fieldName)
.WithTriviaFrom(propertyDeclaration)
.WithFormatterAnnotation();
var parentMember = (MemberDeclarationSyntax)propertyDeclaration.Parent;
SyntaxList <MemberDeclarationSyntax> members = parentMember.GetMembers();
int propertyIndex = members.IndexOf(propertyDeclaration);
if (propertyDeclaration.IsReadOnlyAutoProperty())
{
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
IEnumerable <ReferencedSymbol> referencedSymbols = await SymbolFinder.FindReferencesAsync(
semanticModel.GetDeclaredSymbol(propertyDeclaration, cancellationToken),
document.Project.Solution,
cancellationToken).ConfigureAwait(false);
ImmutableArray <IdentifierNameSyntax> identifierNames = SyntaxUtility
.FindNodes <IdentifierNameSyntax>(oldRoot, referencedSymbols)
.ToImmutableArray();
var rewriter = new IdentifierNameSyntaxRewriter(identifierNames, Identifier(fieldName));
var newParentMember = (MemberDeclarationSyntax)rewriter.Visit(parentMember);
members = newParentMember.GetMembers();
}
int indexOfLastField = members.LastIndexOf(f => f.IsKind(SyntaxKind.FieldDeclaration));
SyntaxList <MemberDeclarationSyntax> newMembers = members
.Replace(members[propertyIndex], newPropertyDeclaration)
.Insert(indexOfLastField + 1, fieldDeclaration);
SyntaxNode newRoot = oldRoot.ReplaceNode(parentMember, parentMember.SetMembers(newMembers));
return(document.WithSyntaxRoot(newRoot));
}
private static async Task <Document> ReplacePropertyWithAutoPropertyAsync(
Document document,
PropertyDeclarationSyntax property,
CancellationToken cancellationToken)
{
SyntaxNode oldRoot = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var parentMember = (MemberDeclarationSyntax)property.Parent;
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
ISymbol fieldSymbol = GetFieldSymbol(property, semanticModel, cancellationToken);
var declarator = (VariableDeclaratorSyntax)await fieldSymbol.DeclaringSyntaxReferences[0].GetSyntaxAsync(cancellationToken).ConfigureAwait(false);
var variableDeclaration = (VariableDeclarationSyntax)declarator.Parent;
SyntaxList <MemberDeclarationSyntax> members = parentMember.GetMembers();
int propertyIndex = members.IndexOf(property);
int fieldIndex = members.IndexOf((FieldDeclarationSyntax)variableDeclaration.Parent);
IEnumerable <ReferencedSymbol> referencedSymbols = await SymbolFinder.FindReferencesAsync(
fieldSymbol,
document.Project.Solution,
cancellationToken).ConfigureAwait(false);
ImmutableArray <IdentifierNameSyntax> identifierNames = SyntaxUtility
.FindNodes <IdentifierNameSyntax>(oldRoot, referencedSymbols)
.ToImmutableArray();
var rewriter = new IdentifierNameSyntaxRewriter(identifierNames, Identifier(property.Identifier.ValueText));
var newParentMember = (MemberDeclarationSyntax)rewriter.Visit(parentMember);
members = newParentMember.GetMembers();
if (variableDeclaration.Variables.Count == 1)
{
newParentMember = newParentMember.RemoveNode(
newParentMember.GetMemberAt(fieldIndex),
SyntaxRemoveOptions.KeepUnbalancedDirectives);
if (propertyIndex > fieldIndex)
{
propertyIndex--;
}
}
else
{
var field = (FieldDeclarationSyntax)members[fieldIndex];
FieldDeclarationSyntax newField = field.RemoveNode(
field.Declaration.Variables[variableDeclaration.Variables.IndexOf(declarator)],
SyntaxRemoveOptions.KeepUnbalancedDirectives);
members = members.Replace(field, newField.WithFormatterAnnotation());
newParentMember = newParentMember.SetMembers(members);
}
members = newParentMember.GetMembers();
property = (PropertyDeclarationSyntax)members[propertyIndex];
PropertyDeclarationSyntax newProperty = CreateAutoProperty(property, declarator.Initializer);
members = members.Replace(property, newProperty);
newParentMember = newParentMember.SetMembers(members);
SyntaxNode newRoot = oldRoot.ReplaceNode(parentMember, newParentMember);
return(document.WithSyntaxRoot(newRoot));
}