private static async Task <Document> InsertCloseParenthesisAsync(
Document document,
ParenthesizedExpressionSyntax parenthesizedExpression,
CancellationToken cancellationToken)
{
var sourceText = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
if (parenthesizedExpression.Expression is ConditionalExpressionSyntax conditional &&
parenthesizedExpression.GetAncestor <InterpolatedStringExpressionSyntax>()?.StringStartToken.Kind() == SyntaxKind.InterpolatedStringStartToken)
{
// If they have something like:
//
// var s3 = $""Text1 { true ? ""Text2""[|:|]
// NextLineOfCode();
//
// We will update this initially to:
//
// var s3 = $""Text1 { (true ? ""Text2""[|:|]
// NextLineOfCode();
//
// And we have to decide where the close paren should go. Based on the parse tree, the
// 'NextLineOfCode()' expression will be pulled into the WhenFalse portion of the conditional.
// So placing the close paren after the conditional woudl result in: 'NextLineOfCode())'.
//
// However, the user intent is likely that NextLineOfCode is not part of the conditional
// So instead find the colon and place the close paren after that, producing:
//
// var s3 = $""Text1 { (true ? ""Text2"":)
// NextLineOfCode();
var endToken = sourceText.AreOnSameLine(conditional.ColonToken, conditional.WhenFalse.GetFirstToken())
? conditional.WhenFalse.GetLastToken()
: conditional.ColonToken;
var closeParenPosition = endToken.Span.End;
var textWithCloseParenthesis = sourceText.Replace(closeParenPosition, 0, ")");
return(document.WithText(textWithCloseParenthesis));
}
var root = await document.GetRequiredSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var newCloseParen = SyntaxFactory.Token(SyntaxKind.CloseParenToken).WithTriviaFrom(parenthesizedExpression.CloseParenToken);
var parenthesizedExpressionWithClosingParen = parenthesizedExpression.WithCloseParenToken(newCloseParen);
var newRoot = root.ReplaceNode(parenthesizedExpression, parenthesizedExpressionWithClosingParen);
return(document.WithSyntaxRoot(newRoot));
}