public static async Task ComputeRefactoringsAsync(RefactoringContext context, InitializerExpressionSyntax initializer)
{
if (!initializer.IsKind(
SyntaxKind.ObjectInitializerExpression,
SyntaxKind.CollectionInitializerExpression))
{
return;
}
if (!initializer.Expressions.Any())
{
return;
}
SyntaxNode parent = initializer.Parent;
if (parent?.Kind() != SyntaxKind.ObjectCreationExpression)
{
return;
}
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
if (!CanExpand(initializer, semanticModel, context.CancellationToken))
{
return;
}
if (parent.IsParentKind(SyntaxKind.SimpleAssignmentExpression))
{
SimpleAssignmentStatementInfo simpleAssignment = SyntaxInfo.SimpleAssignmentStatementInfo((AssignmentExpressionSyntax)parent.Parent);
if (simpleAssignment.Success)
{
RegisterRefactoring(context, simpleAssignment.Statement, initializer, simpleAssignment.Left);
}
}
else
{
LocalDeclarationStatementInfo localInfo = SyntaxInfo.LocalDeclarationStatementInfo((ExpressionSyntax)parent);
if (localInfo.Success)
{
var declarator = (VariableDeclaratorSyntax)parent.Parent.Parent;
RegisterRefactoring(
context,
localInfo.Statement,
initializer,
IdentifierName(declarator.Identifier.ValueText));
}
}
}
public static void AnalyzeLocalDeclarationStatement(SyntaxNodeAnalysisContext context)
{
if (context.Node.ContainsDiagnostics)
{
return;
}
var localDeclaration = (LocalDeclarationStatementSyntax)context.Node;
if (localDeclaration.IsConst)
{
return;
}
StatementListInfo statementsInfo = SyntaxInfo.StatementListInfo(localDeclaration);
if (!statementsInfo.Success)
{
return;
}
SyntaxList <StatementSyntax> statements = statementsInfo.Statements;
if (statements.Count <= 1)
{
return;
}
int index = statements.IndexOf(localDeclaration);
if (index == statements.Count - 1)
{
return;
}
LocalDeclarationStatementInfo localInfo = SyntaxInfo.LocalDeclarationStatementInfo(localDeclaration);
if (!localInfo.Success)
{
return;
}
ITypeSymbol typeSymbol = context.SemanticModel.GetTypeSymbol(localInfo.Type, context.CancellationToken);
if (typeSymbol?.SupportsConstantValue() != true)
{
return;
}
if (localInfo.Type.IsVar && !typeSymbol.SupportsExplicitDeclaration())
{
return;
}
foreach (VariableDeclaratorSyntax declarator in localInfo.Variables)
{
if (!HasConstantValue(declarator.Initializer?.Value, typeSymbol, context.SemanticModel, context.CancellationToken))
{
return;
}
}
if (!CanBeMarkedAsConst(localInfo.Variables, statements, index + 1))
{
return;
}
DiagnosticHelpers.ReportDiagnostic(context, DiagnosticDescriptors.MarkLocalVariableAsConst, localInfo.Type);
}
private static void AnalyzeLocalDeclarationStatement(SyntaxNodeAnalysisContext context)
{
if (context.Node.ContainsDiagnostics)
{
return;
}
var localDeclaration = (LocalDeclarationStatementSyntax)context.Node;
if (localDeclaration.IsConst)
{
return;
}
StatementListInfo statementsInfo = SyntaxInfo.StatementListInfo(localDeclaration);
if (!statementsInfo.Success)
{
return;
}
SyntaxList <StatementSyntax> statements = statementsInfo.Statements;
if (statements.Count <= 1)
{
return;
}
int index = statements.IndexOf(localDeclaration);
if (index == statements.Count - 1)
{
return;
}
LocalDeclarationStatementInfo localInfo = SyntaxInfo.LocalDeclarationStatementInfo(localDeclaration);
if (!localInfo.Success)
{
return;
}
ITypeSymbol typeSymbol = context.SemanticModel.GetTypeSymbol(localInfo.Type, context.CancellationToken);
if (typeSymbol?.SupportsConstantValue() != true)
{
return;
}
if (localInfo.Type.IsVar && !typeSymbol.SupportsExplicitDeclaration())
{
return;
}
foreach (VariableDeclaratorSyntax declarator in localInfo.Variables)
{
ExpressionSyntax value = declarator.Initializer?.Value?.WalkDownParentheses();
if (value?.IsMissing != false)
{
return;
}
if (!HasConstantValue(value, typeSymbol, context.SemanticModel, context.CancellationToken))
{
return;
}
}
if (!CanBeMarkedAsConst(localInfo.Variables, statements, index + 1))
{
return;
}
if (((CSharpParseOptions)context.Node.SyntaxTree.Options).LanguageVersion <= LanguageVersion.CSharp9 &&
ContainsInterpolatedString(localInfo.Variables))
{
return;
}
DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.MarkLocalVariableAsConst, localInfo.Type);
}