private IEnumerable <SyntaxNodeOrToken> DescendantNodesAndTokensOnly(TextSpan span, Func <SyntaxNode, bool> descendIntoChildren, bool includeSelf)
{
if (includeSelf && IsInSpan(ref span, this.FullSpan))
{
yield return(this);
}
using (var stack = new ChildSyntaxListEnumeratorStack(this, descendIntoChildren))
{
while (stack.IsNotEmpty)
{
SyntaxNodeOrToken value;
if (stack.TryGetNextInSpan(ref span, out value))
{
// PERF: Push before yield return so that "value" is 'dead' after the yield
// and therefore doesn't need to be stored in the iterator state machine. This
// saves a field.
var nodeValue = value.AsNode();
if (nodeValue != null)
{
stack.PushChildren(nodeValue, descendIntoChildren);
}
yield return(value);
}
}
}
}
public TwoEnumeratorListStack(SyntaxNode startingNode, Func <SyntaxNode, bool> descendIntoChildren)
{
this.nodeStack = new ChildSyntaxListEnumeratorStack(startingNode, descendIntoChildren);
if (this.nodeStack.IsNotEmpty)
{
this.discriminatorStack = ArrayBuilder <Which> .GetInstance();
this.discriminatorStack.Push(Which.Node);
}
else
{
this.discriminatorStack = null;
}
}
public ThreeEnumeratorListStack(SyntaxNode startingNode, Func <SyntaxNode, bool> descendIntoChildren)
{
_nodeStack = new ChildSyntaxListEnumeratorStack(startingNode, descendIntoChildren);
_triviaStack = new TriviaListEnumeratorStack();
if (_nodeStack.IsNotEmpty)
{
_tokenStack = ArrayBuilder <SyntaxNodeOrToken> .GetInstance();
_discriminatorStack = ArrayBuilder <Which> .GetInstance();
_discriminatorStack.Push(Which.Node);
}
else
{
_tokenStack = null;
_discriminatorStack = null;
}
}
private IEnumerable <SyntaxTrivia> DescendantTriviaOnly(TextSpan span, Func <SyntaxNode, bool> descendIntoChildren)
{
using (var stack = new ChildSyntaxListEnumeratorStack(this, descendIntoChildren))
{
SyntaxNodeOrToken value;
while (stack.IsNotEmpty)
{
if (stack.TryGetNextInSpan(ref span, out value))
{
if (value.IsNode)
{
var nodeValue = value.AsNode();
stack.PushChildren(nodeValue, descendIntoChildren);
}
else if (value.IsToken)
{
var token = value.AsToken();
foreach (var trivia in token.LeadingTrivia)
{
if (IsInSpan(ref span, trivia.FullSpan))
{
yield return(trivia);
}
}
foreach (var trivia in token.TrailingTrivia)
{
if (IsInSpan(ref span, trivia.FullSpan))
{
yield return(trivia);
}
}
}
}
}
}
}