public static void AnalyzeIfStatement(SyntaxNodeAnalysisContext context)
{
var ifStatement = (IfStatementSyntax)context.Node;
if (ifStatement.IsSimpleIf() &&
!ifStatement.ContainsDiagnostics)
{
SyntaxList <StatementSyntax> statements;
if (ifStatement.TryGetContainingList(out statements) &&
!IsPartOfLazyInitialization(ifStatement, statements))
{
EqualsToNullExpression equalsToNull;
if (EqualsToNullExpression.TryCreate(ifStatement.Condition, out equalsToNull))
{
SimpleAssignmentStatement assignment;
if (SimpleAssignmentStatement.TryCreate(ifStatement.GetSingleStatementOrDefault(), out assignment) &&
SyntaxComparer.AreEquivalent(assignment.Left, equalsToNull.Left) &&
assignment.Right.IsSingleLine() &&
!ifStatement.SpanContainsDirectives())
{
int index = statements.IndexOf(ifStatement);
if (index > 0)
{
StatementSyntax previousStatement = statements[index - 1];
if (!previousStatement.ContainsDiagnostics &&
CanRefactor(previousStatement, ifStatement, equalsToNull.Left, ifStatement.Parent))
{
context.ReportDiagnostic(DiagnosticDescriptors.UseCoalesceExpression, previousStatement);
}
}
if (index < statements.Count - 1)
{
StatementSyntax nextStatement = statements[index + 1];
if (!nextStatement.ContainsDiagnostics)
{
MemberInvocationStatement memberInvocation;
if (MemberInvocationStatement.TryCreate(nextStatement, out memberInvocation) &&
SyntaxComparer.AreEquivalent(equalsToNull.Left, memberInvocation.Expression) &&
!ifStatement.Parent.ContainsDirectives(TextSpan.FromBounds(ifStatement.SpanStart, nextStatement.Span.End)))
{
context.ReportDiagnostic(DiagnosticDescriptors.InlineLazyInitialization, ifStatement);
}
}
}
}
}
}
}
}
public static void AnalyzeIfStatement(SyntaxNodeAnalysisContext context, INamedTypeSymbol expressionType)
{
var ifStatement = (IfStatementSyntax)context.Node;
if (ifStatement.IsSimpleIf() &&
!ifStatement.ContainsDiagnostics)
{
NotEqualsToNullExpression notEqualsToNull;
if (NotEqualsToNullExpression.TryCreate(ifStatement.Condition, out notEqualsToNull))
{
MemberInvocationStatement memberInvocation;
if (MemberInvocationStatement.TryCreate(ifStatement.GetSingleStatementOrDefault(), out memberInvocation) &&
notEqualsToNull.Left.IsEquivalentTo(memberInvocation.Expression, topLevel: false) &&
!ifStatement.IsInExpressionTree(expressionType, context.SemanticModel, context.CancellationToken) &&
!ifStatement.SpanContainsDirectives())
{
context.ReportDiagnostic(DiagnosticDescriptors.UseConditionalAccess, ifStatement);
}
}
}
}