Antlr4.Runtime.Dfa.DFA.SetPrecedenceStartState C# (CSharp) Метод

        public void SetPrecedenceStartState(int precedence, DFAState startState)
        {
            if (!IsPrecedenceDfa)
            {
                throw new Exception("Only precedence DFAs may contain a precedence start state.");
            }

            if (precedence < 0)
            {
                return;
            }

            // synchronization on s0 here is ok. when the DFA is turned into a
            // precedence DFA, s0 will be initialized once and not updated again
            lock (s0)
            {
                // s0.edges is never null for a precedence DFA
                if (precedence >= s0.edges.Length)
                {
                    s0.edges = Arrays.CopyOf(s0.edges, precedence + 1);
                }

                s0.edges[precedence] = startState;
            }
        }