State of the parser

Create a new parser state. pos is the initial position, it defaults to {line=1;col=0;offset=0}.

Reset the given parsing state. The following always succeed:

  reset t ?pos;
  assert (t = create ?pos ())

Number of characters fed to the parser

Prevent the state from receiving any more characters. Trying to feed more characters will result in an exception, unless the state is reset.