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));
}