private static bool TryAnalyzeInvocationCondition(
SyntaxNodeAnalysisContext context,
ISyntaxFacts syntaxFacts,
IMethodSymbol?referenceEqualsMethodOpt,
TInvocationExpression invocation,
[NotNullWhen(true)] out SyntaxNode?conditionPartToCheck,
out bool isEquals)
{
conditionPartToCheck = null;
isEquals = true;
var expression = syntaxFacts.GetExpressionOfInvocationExpression(invocation);
var nameNode = syntaxFacts.IsIdentifierName(expression)
? expression
: syntaxFacts.IsSimpleMemberAccessExpression(expression)
? syntaxFacts.GetNameOfMemberAccessExpression(expression)
: null;
if (!syntaxFacts.IsIdentifierName(nameNode))
{
return(false);
}
syntaxFacts.GetNameAndArityOfSimpleName(nameNode, out var name, out _);
if (!syntaxFacts.StringComparer.Equals(name, nameof(ReferenceEquals)))
{
return(false);
}
var arguments = syntaxFacts.GetArgumentsOfInvocationExpression(invocation);
if (arguments.Count != 2)
{
return(false);
}
var conditionLeft = syntaxFacts.GetExpressionOfArgument(arguments[0]);
var conditionRight = syntaxFacts.GetExpressionOfArgument(arguments[1]);
if (conditionLeft == null || conditionRight == null)
{
return(false);
}
conditionPartToCheck = GetConditionPartToCheck(syntaxFacts, conditionLeft, conditionRight);
if (conditionPartToCheck == null)
{
return(false);
}
var semanticModel = context.SemanticModel;
var cancellationToken = context.CancellationToken;
var symbol = semanticModel.GetSymbolInfo(invocation, cancellationToken).Symbol;
return(referenceEqualsMethodOpt != null && referenceEqualsMethodOpt.Equals(symbol));
}
private static string?GetNameOfInvokedExpression(ISyntaxFacts syntaxFacts, SyntaxNode invokedExpression)
{
if (syntaxFacts.IsSimpleMemberAccessExpression(invokedExpression))
{
return(syntaxFacts.GetIdentifierOfSimpleName(syntaxFacts.GetNameOfMemberAccessExpression(invokedExpression)).ValueText);
}
if (syntaxFacts.IsIdentifierName(invokedExpression))
{
return(syntaxFacts.GetIdentifierOfSimpleName(invokedExpression).ValueText);
}
return(null);
}
private static bool IsValidFormatMethod(ISyntaxFacts syntaxFacts, SyntaxNode expression)
{
// When calling string.Format(...), the expression will be MemberAccessExpressionSyntax
if (syntaxFacts.IsSimpleMemberAccessExpression(expression))
{
var nameOfMemberAccessExpression = syntaxFacts.GetNameOfMemberAccessExpression(expression);
return(!syntaxFacts.IsGenericName(nameOfMemberAccessExpression) &&
syntaxFacts.GetIdentifierOfSimpleName(nameOfMemberAccessExpression).ValueText
== (nameof(string.Format)));
}
// When using static System.String and calling Format(...), the expression will be
// IdentifierNameSyntax
if (syntaxFacts.IsIdentifierName(expression))
{
return(syntaxFacts.GetIdentifierOfSimpleName(expression).ValueText
== (nameof(string.Format)));
}
return(false);
}
