protected virtual GrammarAST ExpandOptionalQuantifiersForAlt(GrammarAST alt)
{
if (alt.ChildCount == 0)
{
return null;
}
if (alt.GetChild(0).Type == ANTLRParser.OPTIONAL)
{
GrammarAST root = (GrammarAST)adaptor.Nil();
GrammarAST alt2 = alt.DupTree();
alt2.DeleteChild(0);
if (alt2.ChildCount == 0)
{
adaptor.AddChild(alt2, adaptor.Create(ANTLRParser.EPSILON, "EPSILON"));
}
alt.SetChild(0, alt.GetChild(0).GetChild(0));
if (alt.GetChild(0).Type == ANTLRParser.BLOCK && alt.GetChild(0).ChildCount == 1 && alt.GetChild(0).GetChild(0).Type == ANTLRParser.ALT)
{
GrammarAST list = (GrammarAST)adaptor.Nil();
foreach (object tree in ((GrammarAST)alt.GetChild(0).GetChild(0)).Children)
{
adaptor.AddChild(list, tree);
}
adaptor.ReplaceChildren(alt, 0, 0, list);
}
adaptor.AddChild(root, alt);
adaptor.AddChild(root, alt2);
return root;
}
else if (alt.GetChild(0).Type == ANTLRParser.CLOSURE)
{
GrammarAST root = (GrammarAST)adaptor.Nil();
GrammarAST alt2 = alt.DupTree();
alt2.DeleteChild(0);
if (alt2.ChildCount == 0)
{
adaptor.AddChild(alt2, adaptor.Create(ANTLRParser.EPSILON, "EPSILON"));
}
PlusBlockAST plusBlockAST = new PlusBlockAST(ANTLRParser.POSITIVE_CLOSURE, adaptor.CreateToken(ANTLRParser.POSITIVE_CLOSURE, "+"), null);
for (int i = 0; i < alt.GetChild(0).ChildCount; i++)
{
plusBlockAST.AddChild(alt.GetChild(0).GetChild(i));
}
alt.SetChild(0, plusBlockAST);
adaptor.AddChild(root, alt);
adaptor.AddChild(root, alt2);
return root;
}
return alt;
}