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; }