public static SyntaxNode Unparenthesize(
this ISyntaxFacts syntaxFacts, SyntaxNode node)
{
SyntaxToken openParenToken;
SyntaxNode operand;
SyntaxToken closeParenToken;
if (syntaxFacts.IsParenthesizedPattern(node))
{
syntaxFacts.GetPartsOfParenthesizedPattern(node,
out openParenToken, out operand, out closeParenToken);
}
else
{
syntaxFacts.GetPartsOfParenthesizedExpression(node,
out openParenToken, out operand, out closeParenToken);
}
var leadingTrivia = openParenToken.LeadingTrivia
.Concat(openParenToken.TrailingTrivia)
.Where(t => !syntaxFacts.IsElastic(t))
.Concat(operand.GetLeadingTrivia());
var trailingTrivia = operand.GetTrailingTrivia()
.Concat(closeParenToken.LeadingTrivia)
.Where(t => !syntaxFacts.IsElastic(t))
.Concat(closeParenToken.TrailingTrivia);
var resultNode = operand
.WithLeadingTrivia(leadingTrivia)
.WithTrailingTrivia(trailingTrivia);
// If there's no trivia between the original node and the tokens around it, then add
// elastic markers so the formatting engine will spaces if necessary to keep things
// parseable.
if (resultNode.GetLeadingTrivia().Count == 0)
{
var previousToken = node.GetFirstToken().GetPreviousToken();
if (previousToken.TrailingTrivia.Count == 0 &&
syntaxFacts.IsWordOrNumber(previousToken) &&
syntaxFacts.IsWordOrNumber(resultNode.GetFirstToken()))
{
resultNode = resultNode.WithPrependedLeadingTrivia(syntaxFacts.ElasticMarker);
}
}
if (resultNode.GetTrailingTrivia().Count == 0)
{
var nextToken = node.GetLastToken().GetNextToken();
if (nextToken.LeadingTrivia.Count == 0 &&
syntaxFacts.IsWordOrNumber(nextToken) &&
syntaxFacts.IsWordOrNumber(resultNode.GetLastToken()))
{
resultNode = resultNode.WithAppendedTrailingTrivia(syntaxFacts.ElasticMarker);
}
}
return(resultNode);
}
public static SyntaxNode GetExpressionOfParenthesizedExpression(
this ISyntaxFacts syntaxFacts,
SyntaxNode node
)
{
syntaxFacts.GetPartsOfParenthesizedExpression(node, out _, out var expression, out _);
return(expression);
}
