/// <summary>
/// Replaces all node for which predicate returns true anywhere in the tree
/// with a clone of template.
/// </summary>
/// <returns>the number of nodes replaced</returns>
public int ReplaceNodes(NodePredicate predicate, Node template)
{
ReplaceVisitor visitor = new ReplaceVisitor(predicate, template);
Accept(visitor);
return(visitor.Matches);
}
public virtual IEnumerable <EvalNode> Collect(NodePredicate predicate)
{
if (predicate(this))
{
return new List <EvalNode>()
{
this
}
}
;
else
{
return(Enumerable.Empty <EvalNode>());
}
}
public override IEnumerable <EvalNode> Collect(NodePredicate predicate)
{
List <EvalNode> ret = new List <EvalNode>();
if (predicate(this))
{
ret.Add(this);
}
foreach (var child in children)
{
ret.AddRange(child.Collect(predicate));
}
return(ret);
}
/// <summary>
/// Replaces all occurrences of the pattern pattern anywhere in the tree
/// with a clone of template.
/// </summary>
/// <returns>the number of nodes replaced</returns>
public int ReplaceNodes(Node pattern, Node template)
{
NodePredicate predicate = new NodePredicate(pattern.Matches);
return(ReplaceNodes(predicate, template));
}
public ReplaceVisitor(NodePredicate predicate, Node template)
{
_predicate = predicate;
_template = template;
}