Antlr4.Runtime.Misc.IntervalSet.ToString C# (CSharp) Метод

        public virtual string ToString(bool elemAreChar)
        {
            StringBuilder buf = new StringBuilder();
            if (this.intervals == null || this.intervals.Count == 0)
            {
                return "{}";
            }
            if (this.Count > 1)
            {
                buf.Append("{");
            }

            bool first = true;
            foreach (Interval I in intervals)
            {
                if (!first)
                    buf.Append(", ");

                first = false;
                int a = I.a;
                int b = I.b;
                if (a == b)
                {
                    if (a == TokenConstants.EOF)
                    {
                        buf.Append("<EOF>");
                    }
                    else
                    {
                        if (elemAreChar)
                        {
                            buf.Append("'").Append((char)a).Append("'");
                        }
                        else
                        {
                            buf.Append(a);
                        }
                    }
                }
                else
                {
                    if (elemAreChar)
                    {
                        buf.Append("'").Append((char)a).Append("'..'").Append((char)b).Append("'");
                    }
                    else
                    {
                        buf.Append(a).Append("..").Append(b);
                    }
                }
            }
            if (this.Count > 1)
            {
                buf.Append("}");
            }
            return buf.ToString();
        }

 public void TestIsolatedElements()
 {
     IntervalSet s = new IntervalSet();
     s.Add(1);
     s.Add('z');
     s.Add('\uFFF0');
     String expecting = "{1, 122, 65520}";
     Assert.AreEqual(s.ToString(), expecting);
 }