public static Task <Document> InlineLazyInitializationAsync(
Document document,
IfStatementSyntax ifStatement,
CancellationToken cancellationToken = default)
{
StatementListInfo statementsInfo = SyntaxInfo.StatementListInfo(ifStatement);
var assignmentStatement = (ExpressionStatementSyntax)ifStatement.SingleNonBlockStatementOrDefault();
SimpleAssignmentStatementInfo assignmentInfo = SyntaxInfo.SimpleAssignmentStatementInfo(assignmentStatement, walkDownParentheses: false);
ExpressionSyntax right = assignmentInfo.Right;
int index = statementsInfo.IndexOf(ifStatement);
var expressionStatement2 = (ExpressionStatementSyntax)statementsInfo[index + 1];
SimpleMemberInvocationStatementInfo invocationInfo = SyntaxInfo.SimpleMemberInvocationStatementInfo(expressionStatement2);
ExpressionSyntax expression = invocationInfo.Expression;
var newLeading = new List <SyntaxTrivia>(ifStatement.GetLeadingTrivia());
ExpressionSyntax coalesceExpression;
if (document.SupportsLanguageFeature(CSharpLanguageFeature.NullCoalescingAssignmentOperator))
{
AddTrivia(ifStatement.DescendantTrivia(TextSpan.FromBounds(ifStatement.SpanStart, right.SpanStart)).ToSyntaxTriviaList());
coalesceExpression = CoalesceAssignmentExpression(expression.WithoutTrivia(), right.WithoutTrivia());
}
else
{
AddTrivia(ifStatement.DescendantTrivia(TextSpan.FromBounds(ifStatement.SpanStart, assignmentInfo.AssignmentExpression.SpanStart)).ToSyntaxTriviaList());
coalesceExpression = CoalesceExpression(expression.WithoutTrivia(), ParenthesizedExpression(assignmentInfo.AssignmentExpression.WithoutTrivia()));
}
AddTrivia(ifStatement.DescendantTrivia(TextSpan.FromBounds(right.Span.End, ifStatement.Span.End)).ToSyntaxTriviaList());
AddTrivia(ifStatement.GetTrailingTrivia());
AddTrivia(expressionStatement2.GetLeadingTrivia());
ParenthesizedExpressionSyntax newExpression = ParenthesizedExpression(coalesceExpression)
.WithLeadingTrivia(newLeading)
.WithTrailingTrivia(expression.GetTrailingTrivia());
StatementSyntax newExpressionStatement = expressionStatement2.ReplaceNode(expression, newExpression);
StatementListInfo newStatements = statementsInfo
.Replace(expressionStatement2, newExpressionStatement)
.RemoveAt(index);
return(document.ReplaceStatementsAsync(statementsInfo, newStatements, cancellationToken));
void AddTrivia(SyntaxTriviaList trivia)
{
if (!trivia.IsEmptyOrWhitespace())
{
newLeading.AddRange(trivia);
}
}
}