static VariableDeclarationSyntax ReplaceStartValue(VariableDeclarationSyntax declaration, ExpressionSyntax newStartValue)
{
if (declaration == null) return null;
var variable = declaration.Variables[0].WithInitializer(SyntaxFactory.EqualsValueClause(newStartValue));
return declaration.WithVariables(new SeparatedSyntaxList<VariableDeclaratorSyntax>().Add(variable));
}
private static List<BaseFieldDeclarationSyntax> DeclarationSplitter(
Document document,
VariableDeclarationSyntax declaration,
Func<VariableDeclarationSyntax, BaseFieldDeclarationSyntax> declarationFactory,
SyntaxTriviaList declarationTrailingTrivia)
{
SeparatedSyntaxList<VariableDeclaratorSyntax> variables = declaration.Variables;
VariableDeclaratorSyntax first = variables.First();
BaseFieldDeclarationSyntax previous = null;
var newFieldDeclarations = new List<BaseFieldDeclarationSyntax>(variables.Count);
foreach (SyntaxNodeOrToken nodeOrToken in variables.GetWithSeparators())
{
if (previous == null)
{
VariableDeclaratorSyntax variable = (VariableDeclaratorSyntax)nodeOrToken.AsNode();
variable = variable.WithIdentifier(variable.Identifier.WithoutLeadingWhitespace());
var variableDeclarator = SyntaxFactory.SingletonSeparatedList(variable);
previous = declarationFactory(declaration.WithVariables(variableDeclarator));
if (variable != first)
{
var triviaList = previous.GetLeadingTrivia().WithoutDirectiveTrivia();
previous = previous.WithLeadingTrivia(triviaList);
}
}
else
{
SyntaxToken commaToken = nodeOrToken.AsToken();
SyntaxTriviaList trailingTrivia = commaToken.TrailingTrivia;
if (trailingTrivia.Any())
{
if (!trailingTrivia.Last().IsKind(SyntaxKind.EndOfLineTrivia))
{
trailingTrivia = trailingTrivia.WithoutTrailingWhitespace().Add(FormattingHelper.GetNewLineTrivia(document));
}
}
else
{
trailingTrivia = SyntaxTriviaList.Create(FormattingHelper.GetNewLineTrivia(document));
}
newFieldDeclarations.Add(previous.WithTrailingTrivia(trailingTrivia));
previous = null;
}
}
newFieldDeclarations.Add(previous.WithTrailingTrivia(declarationTrailingTrivia));
return newFieldDeclarations;
}
