private static bool IsFixable(
ExpressionSyntax left,
BinaryExpressionSyntax right,
SemanticModel semanticModel,
CancellationToken cancellationToken = default)
{
NullCheckExpressionInfo nullCheck = SyntaxInfo.NullCheckExpressionInfo(left);
if (!nullCheck.Success)
{
return(false);
}
ExpressionSyntax expression = nullCheck.Expression;
if (CSharpFactory.AreEquivalent(expression, right.Left))
{
return(right.IsKind(SyntaxKind.EqualsExpression, SyntaxKind.NotEqualsExpression) &&
SymbolEquals(expression, right.Left, semanticModel, cancellationToken) &&
CSharpUtility.IsEmptyStringExpression(right.Right, semanticModel, cancellationToken));
}
if (right.Left.IsKind(SyntaxKind.SimpleMemberAccessExpression))
{
var memberAccess = (MemberAccessExpressionSyntax)right.Left;
return(string.Equals(memberAccess.Name.Identifier.ValueText, "Length", StringComparison.Ordinal) &&
right.Right.IsNumericLiteralExpression("0") &&
semanticModel.GetSymbol(memberAccess, cancellationToken) is IPropertySymbol propertySymbol &&
!propertySymbol.IsIndexer &&
SymbolUtility.IsPublicInstance(propertySymbol, "Length") &&
propertySymbol.Type.SpecialType == SpecialType.System_Int32 &&
propertySymbol.ContainingType?.SpecialType == SpecialType.System_String &&
CSharpFactory.AreEquivalent(expression, memberAccess.Expression) &&
SymbolEquals(expression, memberAccess.Expression, semanticModel, cancellationToken));
}
return(false);
}