private static RowRegexExprNode Replace(RowRegexExprNode optionalParent, RowRegexExprNode originalNode, IList <RowRegexExprNode> expandedRepeat)
{
if (optionalParent == null)
{
var newParentNode = new RowRegexExprNodeConcatenation();
newParentNode.ChildNodes.AddAll(expandedRepeat);
return(newParentNode);
}
// for nested nodes, use a concatenation instead
if (optionalParent is RowRegexExprNodeNested ||
optionalParent is RowRegexExprNodeAlteration)
{
var concatenation = new RowRegexExprNodeConcatenation();
concatenation.ChildNodes.AddAll(expandedRepeat);
optionalParent.ReplaceChildNode(originalNode, Collections.SingletonList <RowRegexExprNode>(concatenation));
}
// concatenations are simply changed
else
{
optionalParent.ReplaceChildNode(originalNode, expandedRepeat);
}
return(null);
}
private static RowRegexExprNodeAlteration ExpandPermute(RowRegexExprNodePermute permute)
{
var e = PermutationEnumerator.Create(permute.ChildNodes.Count);
var parent = new RowRegexExprNodeAlteration();
foreach (int[] indexes in e)
{
var concat = new RowRegexExprNodeConcatenation();
parent.AddChildNode(concat);
for (var i = 0; i < indexes.Length; i++)
{
RowRegexExprNode toCopy = permute.ChildNodes[indexes[i]];
var copy = CheckedCopy(toCopy);
concat.AddChildNode(copy);
}
}
return(parent);
}
