module Antlr4::Runtime

  class PredicateTransition < AbstractPredicateTransition
    attr_reader :rule_index
    attr_reader :pred_index
    attr_reader :is_ctx_dependent # e.g., $i ref in pred

    def initialize(target, rule_index, pred_index, is_ctx_dependent)
      super(target)
      @rule_index = rule_index
      @pred_index = pred_index
      @is_ctx_dependent = is_ctx_dependent
    end

    def serialization_type
      PREDICATE
    end

    def epsilon?
      true
    end

    def matches(_symbol, _min_vocab_symbol, _max_vocab_symbol)
      false
    end

    def predicate
      SemanticContext::Predicate.new(@rule_index, @pred_index, @is_ctx_dependent)
    end

    def to_s
      'pred_' + @rule_index + ':' + @pred_index
    end
  end
end