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