System.IO.TextReader.Peek C# (CSharp) Method

        public virtual int Peek()
        {
            return -1;
        }

 private string AccumulatePartial(TextReader reader)
 {
     StringBuilder buffer = new StringBuilder();
     buffer.Append(">");
     do
     {
         reader.Read();
     }
     while(char.IsWhiteSpace((char)reader.Peek()));
     while(true)
     {
         var peek = (char)reader.Peek();
         if (peek == '}' || peek == '~' || char.IsWhiteSpace(peek))
         {
             break;
         }
         var node = reader.Read();
         if (node == -1)
         {
             throw new InvalidOperationException("Reached end of template before the expression was closed.");
         }
         else
         {
             buffer.Append((char)node);
         }
     }
     return buffer.ToString();
 }