private static SyntaxRemoveOptions CreateSyntaxRemoveOptions(
TLocalDeclarationStatement localDeclaration,
IBlockFactsService blockFacts)
{
var removeOptions = SyntaxGenerator.DefaultRemoveOptions;
if (localDeclaration != null)
{
if (localDeclaration.GetLeadingTrivia().Contains(t => t.IsDirective))
{
removeOptions |= SyntaxRemoveOptions.KeepLeadingTrivia;
}
else
{
var statementParent = localDeclaration.Parent;
if (blockFacts.IsExecutableBlock(statementParent))
{
var siblings = blockFacts.GetExecutableBlockStatements(statementParent);
var localDeclarationIndex = siblings.IndexOf(localDeclaration);
if (localDeclarationIndex != 0)
{
// if we're removing the first statement in a block, then we
// want to have the elastic marker on it so that the next statement
// properly formats with the space left behind. But if it's
// not the first statement then just keep the trivia as is
// so that the statement before and after it stay appropriately
// spaced apart.
removeOptions &= ~SyntaxRemoveOptions.AddElasticMarker;
}
}
}
}
return(removeOptions);
}
protected override bool ShouldOfferFixForLocalDeclaration(IBlockFactsService blockFacts, SyntaxNode node)
{
// If the fix location is not for a local declaration then we can allow it (eg, when inside a for
// or catch).
if (node.Parent?.Parent is not LocalDeclarationStatementSyntax localDeclaration)
{
return(true);
}
// Local declarations must be parented by an executable block, or global statement, otherwise
// removing them would be invalid (and more than likely crash the fixer)
return(localDeclaration.Parent is GlobalStatementSyntax ||
blockFacts.IsExecutableBlock(localDeclaration.Parent));
}
private static bool TryGetSiblingStatement(
ISyntaxFactsService syntaxFacts,
IBlockFactsService blockFacts,
SyntaxNode ifOrElseIf,
int relativeIndex,
out SyntaxNode statement)
{
if (syntaxFacts.IsExecutableStatement(ifOrElseIf) &&
blockFacts.IsExecutableBlock(ifOrElseIf.Parent))
{
var blockStatements = blockFacts.GetExecutableBlockStatements(ifOrElseIf.Parent);
statement = blockStatements.ElementAtOrDefault(blockStatements.IndexOf(ifOrElseIf) + relativeIndex);
return(statement != null);
}
statement = null;
return(false);
}
