combinator method
Implementation
Parser<CombinatorNode> combinator() => [
(ref0(showToken) &
ref0(identifier)
.plusSeparated(ref1(token, ','))
.map((l) => l.elements))
.map((l) => ShowCombinatorNode(l[1] as List<String>)),
(ref0(hideToken) &
ref0(identifier)
.plusSeparated(ref1(token, ','))
.map((l) => l.elements))
.map((l) => HideCombinatorNode(l[1] as List<String>)),
].toChoiceParser();