protected virtual bool ExpandOptionalQuantifiersForBlock(GrammarAST block, bool variant)
{
IList<GrammarAST> children = new List<GrammarAST>();
for (int i = 0; i < block.ChildCount; i++)
{
GrammarAST child = (GrammarAST)block.GetChild(i);
if (child.Type != ANTLRParser.ALT)
{
children.Add(child);
continue;
}
GrammarAST expandedAlt = ExpandOptionalQuantifiersForAlt(child);
if (expandedAlt == null)
{
return false;
}
children.Add(expandedAlt);
}
GrammarAST newChildren = (GrammarAST)adaptor.Nil();
newChildren.AddChildren(children);
block.ReplaceChildren(0, block.ChildCount - 1, newChildren);
block.FreshenParentAndChildIndexesDeeply();
if (!variant && block.Parent is RuleAST)
{
RuleAST ruleAST = (RuleAST)block.Parent;
string ruleName = ruleAST.GetChild(0).Text;
Rule r = _rules[ruleName];
IList<GrammarAST> blockAlts = block.GetAllChildrenWithType(ANTLRParser.ALT);
r.numberOfAlts = blockAlts.Count;
r.alt = new Alternative[blockAlts.Count + 1];
for (int i = 0; i < blockAlts.Count; i++)
{
r.alt[i + 1] = new Alternative(r, i + 1);
r.alt[i + 1].ast = (AltAST)blockAlts[i];
}
}
return true;
}