internal static TSyntax AddLeadingTrivia <TSyntax>(this TSyntax node, InternalSyntax.SyntaxList <GreenNode> trivia) where TSyntax : GreenNode
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (!trivia.Any())
{
return(node);
}
var tk = (node as SyntaxToken.Green);
TSyntax result;
if (tk != null)
{
// Cannot add unexpected tokens as leading trivia on a missing token since
// if the unexpected tokens end with a statement terminator, the missing
// token would follow the statement terminator. That would result in an
// incorrect syntax tree and if this missing token is the end of an expression,
// and the expression represents a transition between VB and XML, the
// terminator will be overlooked (see ParseXmlEmbedded for instance).
if (IsMissingToken(tk))
{
var leadingTrivia = trivia.GetStartOfTrivia();
var trailingTrivia = trivia.GetEndOfTrivia();
tk = SyntaxToken.Green.AddLeadingTrivia(tk, leadingTrivia).AddTrailingTrivia(trailingTrivia);
}
else
{
tk = SyntaxToken.Green.AddLeadingTrivia(tk, trivia);
}
result = ((TSyntax)((object)tk));
}
else
{
result = FirstTokenReplacer.Replace(node, t => SyntaxToken.Green.AddLeadingTrivia(t, trivia));
}
return(result);
}
internal static InternalSyntax.SyntaxList <GreenNode> GetStartOfTrivia(this InternalSyntax.SyntaxList <GreenNode> trivia)
{
return(trivia.GetStartOfTrivia(trivia.GetIndexOfEndOfTrivia()));
}
