Buffer used to parse strings into lines.
type 
The buffer handle.
 
exception No_next_line
The exception thrown by next_line_exn.
 
val make : ?filename:string -> unit -> t
Make a new empty buffer. The optional filename is used only
      for error reporting; it should be set to the name of the file,
      if any, from which you will feed the buffer.
 
val feed_string : t -> string -> unit
Feed the parser with an arbitrary string buffer.
 
val queued_lines : t -> int
Get the number of lines ready-to-use in the buffer/queue.
 
val is_empty : t -> bool
Tell if the parser's buffers are empty or not. For instance,
      when there is no more content to feed and next_line returns
      None, is_empty p = true means that the content did not end
      with a complete line.
 
val contents : t -> Biocaml_lines.item list * string option
Return any remaining lines and the unfinished string, without
      removing them from the buffer.
 
val empty : t -> unit
Empty the buffer. Subsequent call to contents will return
      ([], None).