public PreviousSymbol(LexerResult s, ParseTreeNode p, List <string> r, List <string> n,
bool optional)
{
symbol = (LexerResult)s.Clone(); // (lex results never mutated)
parent = p; // .clone(); // Capture state of subtree on construction.
if (s.BLEFT != null)
{
parent.children.Add(s.BLEFT);
}
if (s.TLEFT != null)
{
parent.children.Add(s.TLEFT);
}
// Avoid crashing on null values.
if (r == null)
{
regions = new List <string>();
regionNonterminals = new List <string>();
}
else
{
regions = r;
regionNonterminals = n;
}
regionsOptional = optional;
}
public override ParseTreeNode clone()
{
// Node labels and stoke data will be fixed for a given node (ref. only), but children will
// differ for different parse trees (new copy).
LexerResult resultCopy = (LexerResult)symbolData.Clone();
SymbolTreeNode nodeCopy = new SymbolTreeNode(resultCopy);
nodeCopy.strokes = strokes;
nodeCopy.lbt = null;
if (lbt != null)
{
nodeCopy.lbt = new LBT(lbt); // copy lbt
}
if (children != null)
{
foreach (ParseTreeNode child in children)
{
nodeCopy.children.Add(child.clone());
}
}
nodeCopy.symbolData = symbolData;
return(nodeCopy);
}
