private bool TryAnalyzeAddInvocation(
TExpressionStatementSyntax statement,
out SyntaxNode instance)
{
instance = null;
var invocationExpression = _syntaxFacts.GetExpressionOfExpressionStatement(statement) as TInvocationExpressionSyntax;
if (invocationExpression == null)
{
return(false);
}
var arguments = _syntaxFacts.GetArgumentsOfInvocationExpression(invocationExpression);
if (arguments.Count < 1)
{
return(false);
}
foreach (var argument in arguments)
{
if (!_syntaxFacts.IsSimpleArgument(argument))
{
return(false);
}
}
var memberAccess = _syntaxFacts.GetExpressionOfInvocationExpression(invocationExpression) as TMemberAccessExpressionSyntax;
if (memberAccess == null)
{
return(false);
}
if (!_syntaxFacts.IsSimpleMemberAccessExpression(memberAccess))
{
return(false);
}
SyntaxNode memberName;
_syntaxFacts.GetPartsOfMemberAccessExpression(memberAccess, out instance, out memberName);
string name;
int arity;
_syntaxFacts.GetNameAndArityOfSimpleName(memberName, out name, out arity);
if (arity != 0 || !name.Equals(nameof(IList.Add)))
{
return(false);
}
return(true);
}
private void FixAllExpressionValueIsUnusedDiagnostics(
IOrderedEnumerable <Diagnostic> diagnostics,
SemanticModel semanticModel,
SyntaxNode root,
UnusedValuePreference preference,
UniqueVariableNameGenerator nameGenerator,
SyntaxEditor editor,
ISyntaxFactsService syntaxFacts,
CancellationToken cancellationToken)
{
// This method applies the code fix for diagnostics reported for expression statement dropping values.
// We replace each flagged expression statement with an assignment to a discard variable or a new unused local,
// based on the user's preference.
foreach (var diagnostic in diagnostics)
{
var expressionStatement = root.FindNode(diagnostic.Location.SourceSpan).FirstAncestorOrSelf <TExpressionStatementSyntax>();
if (expressionStatement == null)
{
continue;
}
var expression = syntaxFacts.GetExpressionOfExpressionStatement(expressionStatement);
switch (preference)
{
case UnusedValuePreference.DiscardVariable:
Debug.Assert(semanticModel.Language != LanguageNames.VisualBasic);
var discardAssignmentExpression = (TExpressionSyntax)editor.Generator.AssignmentStatement(
left: editor.Generator.IdentifierName(AbstractRemoveUnusedParametersAndValuesDiagnosticAnalyzer.DiscardVariableName),
right: expression.WithoutTrivia())
.WithTriviaFrom(expression)
.WithAdditionalAnnotations(Simplifier.Annotation, Formatter.Annotation);
editor.ReplaceNode(expression, discardAssignmentExpression);
break;
case UnusedValuePreference.UnusedLocalVariable:
// Add Simplifier annotation so that 'var'/explicit type is correctly added based on user options.
var localDecl = editor.Generator.LocalDeclarationStatement(
name: nameGenerator.GenerateUniqueNameAtSpanStart(expressionStatement),
initializer: expression.WithoutLeadingTrivia())
.WithTriviaFrom(expressionStatement)
.WithAdditionalAnnotations(Simplifier.Annotation, Formatter.Annotation);
editor.ReplaceNode(expressionStatement, localDecl);
break;
}
}
}
