private Task <Document> GetUpdatedDocumentForRuleNameRename(Document document, SyntaxNode root, SyntaxNode nodeToFix, INamedTypeSymbol enumType, IEnumerable <IFieldSymbol> zeroValuedFields, CancellationToken cancellationToken)
{
Contract.ThrowIfFalse(zeroValuedFields.Count() == 1);
var zeroValuedField = zeroValuedFields.Single();
Contract.ThrowIfTrue(CA1008DiagnosticAnalyzer.IsMemberNamedNone(zeroValuedField));
var newFields = GetNewFieldsForRuleNameRename(enumType, zeroValuedField);
return(GetUpdatedDocumentWithFix(document, root, nodeToFix, newFields, cancellationToken));
}
private IList <ISymbol> GetNewFieldsForRuleNameMultipleZero(INamedTypeSymbol enumType, IEnumerable <IFieldSymbol> zeroValuedFields, SyntaxGenerator syntaxFactoryService)
{
// Diagnostic: Remove all members that have the value zero from '{0}' except for one member that is named 'None'.
// Fix: Remove all members that have the value zero except for one member that is named 'None'.
bool needsNewZeroValuedNoneField = true;
var set = zeroValuedFields.ToSet();
bool makeNextFieldExplicit = false;
var newFields = new List <ISymbol>();
foreach (IFieldSymbol field in enumType.GetMembers().Where(m => m.Kind == SymbolKind.Field))
{
var isZeroValued = set.Contains(field);
var isZeroValuedNamedNone = isZeroValued && CA1008DiagnosticAnalyzer.IsMemberNamedNone(field);
if (!isZeroValued || isZeroValuedNamedNone)
{
var newField = field;
if (makeNextFieldExplicit)
{
newField = GetExplicitlyAssignedField(field, syntaxFactoryService);
makeNextFieldExplicit = false;
}
newFields.Add(newField);
if (isZeroValuedNamedNone)
{
needsNewZeroValuedNoneField = false;
}
}
else
{
makeNextFieldExplicit = true;
}
}
if (needsNewZeroValuedNoneField)
{
var firstZeroValuedField = zeroValuedFields.First();
var constantValueExpression = syntaxFactoryService.LiteralExpression(firstZeroValuedField.ConstantValue);
var newInitializer = CreateConstantValueInitializer(constantValueExpression);
var newField = CodeGenerationSymbolFactory.CreateFieldSymbol(firstZeroValuedField.GetAttributes(), firstZeroValuedField.DeclaredAccessibility, firstZeroValuedField.GetSymbolModifiers(),
firstZeroValuedField.Type, "None", firstZeroValuedField.HasConstantValue, firstZeroValuedField.ConstantValue, newInitializer);
newFields.Insert(0, newField);
}
return(newFields);
}
private async Task ApplyRuleNameNoZeroValueAsync(SymbolEditor editor, INamedTypeSymbol enumType, CancellationToken cancellationToken)
{
// remove any non-zero member named 'None'
foreach (IFieldSymbol field in enumType.GetMembers().Where(m => m.Kind == SymbolKind.Field))
{
if (CA1008DiagnosticAnalyzer.IsMemberNamedNone(field))
{
await editor.EditOneDeclarationAsync(field, (e, d) => e.RemoveNode(d), cancellationToken);
}
}
// insert zero-valued member 'None' to top
await editor.EditOneDeclarationAsync(enumType, (e, d) => e.InsertMembers(d, 0, new[] { e.Generator.EnumMember("None") }), cancellationToken);
}
private async Task ApplyRuleNameMultipleZeroAsync(SymbolEditor editor, INamedTypeSymbol enumType, CancellationToken cancellationToken)
{
// Diagnostic: Remove all members that have the value zero from '{0}' except for one member that is named 'None'.
// Fix: Remove all members that have the value zero except for one member that is named 'None'.
bool needsNewZeroValuedNoneField = true;
var set = CA1008DiagnosticAnalyzer.GetZeroValuedFields(enumType).ToSet();
bool makeNextFieldExplicit = false;
foreach (IFieldSymbol field in enumType.GetMembers().Where(m => m.Kind == SymbolKind.Field))
{
var isZeroValued = set.Contains(field);
var isZeroValuedNamedNone = isZeroValued && CA1008DiagnosticAnalyzer.IsMemberNamedNone(field);
if (!isZeroValued || isZeroValuedNamedNone)
{
if (makeNextFieldExplicit)
{
await editor.EditOneDeclarationAsync(field, (e, d) => e.ReplaceNode(d, GetExplicitlyAssignedField(field, d, e.Generator)), cancellationToken);
makeNextFieldExplicit = false;
}
if (isZeroValuedNamedNone)
{
needsNewZeroValuedNoneField = false;
}
}
else
{
await editor.EditOneDeclarationAsync(field, (e, d) => e.RemoveNode(d), cancellationToken); // removes the field declaration
makeNextFieldExplicit = true;
}
}
if (needsNewZeroValuedNoneField)
{
await editor.EditOneDeclarationAsync(enumType, (e, d) => e.InsertMembers(d, 0, new[] { e.Generator.EnumMember("None") }), cancellationToken);
}
}
private IList <ISymbol> GetNewFieldsForRuleNameNoZeroValue(INamedTypeSymbol enumType, SyntaxGenerator syntaxFactoryService)
{
// Diagnostic: Add a member to '{0}' that has a value of zero with a suggested name of 'None'.
// Fix: Add a zero-valued member 'None' to enum.
var newFields = new List <ISymbol>();
var constantValueExpression = syntaxFactoryService.LiteralExpression(0);
var newInitializer = CreateConstantValueInitializer(constantValueExpression);
var newField = CodeGenerationSymbolFactory.CreateFieldSymbol(SpecializedCollections.EmptyList <AttributeData>(), Accessibility.Public,
default(SymbolModifiers), enumType.EnumUnderlyingType, "None", true, 0, newInitializer);
newFields.Add(newField);
foreach (var member in enumType.GetMembers())
{
if (!CA1008DiagnosticAnalyzer.IsMemberNamedNone(member))
{
newFields.Add(member);
}
}
return(newFields);
}