/// <summary>Find elements matching selector.</summary>
/// <param name="query">CSS selector</param>
/// <param name="roots">root elements to descend into</param>
/// <returns>matching elements, empty if none</returns>
public static Elements Select(String query, IEnumerable <iText.StyledXmlParser.Jsoup.Nodes.Element> roots)
{
Validate.NotEmpty(query);
Validate.NotNull(roots);
Evaluator evaluator = QueryParser.Parse(query);
List <iText.StyledXmlParser.Jsoup.Nodes.Element> elements = new List <iText.StyledXmlParser.Jsoup.Nodes.Element
>();
IdentityDictionary <iText.StyledXmlParser.Jsoup.Nodes.Element, bool?> seenElements = new IdentityDictionary
<iText.StyledXmlParser.Jsoup.Nodes.Element, bool?>();
// dedupe elements by identity, not equality
foreach (iText.StyledXmlParser.Jsoup.Nodes.Element root in roots)
{
Elements found = Select(evaluator, root);
foreach (iText.StyledXmlParser.Jsoup.Nodes.Element el in found)
{
if (!seenElements.ContainsKey(el))
{
elements.Add(el);
seenElements.Put(el, true);
}
}
}
return(new Elements(elements));
}
private Tuple <Tree, Tree> CopyHelper(Tree node, Dictionary <string, Tree> newNamesToNodes)
{
Tree clone;
Tree newFoot = null;
if (node.IsLeaf())
{
if (node == Foot)
{
// found the foot node; pass it up.
clone = node.TreeFactory().NewTreeNode(node.Label(), new List <Tree>(0));
newFoot = clone;
}
else
{
clone = node.TreeFactory().NewLeaf(node.Label().LabelFactory().NewLabel(node.Label()));
}
}
else
{
var newChildren = new List <Tree>(node.Children().Length);
foreach (Tree child in node.Children())
{
Tuple <Tree, Tree> newChild = CopyHelper(child, newNamesToNodes);
newChildren.Add(newChild.Item1);
if (newChild.Item2 != null)
{
newFoot = newChild.Item2;
}
}
clone = node.TreeFactory().NewTreeNode(node.Label().LabelFactory().NewLabel(node.Label()), newChildren);
}
if (nodesToNames.ContainsKey(node))
{
newNamesToNodes.Add(nodesToNames[node], clone);
}
return(new Tuple <Tree, Tree>(clone, newFoot));
}
