public ProductionReference addBrackets(ProductionReference inner, TermCons outer, ProductionReference leftCapture, ProductionReference rightCapture) { if (requiresBracketWithSimpleAlgorithm(outer, leftCapture, rightCapture, inner)) { int position = getPosition(inner, outer); Sort outerSort = ((NonTerminal)outer.production().items().apply(position)).sort(); Sort innerSort = inner.production().sort(); for (Tuple2<Sort, scala.collection.immutable.List<Production>> sort : iterable(m.bracketProductionsFor())) { boolean isCorrectOuterSort = m.subsorts().lessThanEq(sort._1(), outerSort); if (isCorrectOuterSort) { for (Production p : mutable(sort._2())) { boolean isCorrectInnerSort = stream(p.items()) .filter(i -> i instanceof NonTerminal) .map(i -> (NonTerminal) i) .map(NonTerminal::sort) .filter(s -> m.subsorts().lessThanEq(innerSort, s)) .findAny().isPresent(); if (isCorrectInnerSort) { return TermCons.apply(ConsPStack.singleton(inner), p); } } } } return TermCons.apply(ConsPStack.singleton(inner), Production(Sorts.KBott(), Seq(NonTerminal(Sorts.K())))); } return inner; }