for lruby parser

repl.lrb

# shell.lrb  ## LinearRuby version of the shell class from definitions.
@main = self
@context = @main
@cid = 0
@input = nil
@res = nil
@excep = []
@running = nil

def start
  if @running == true;  return false;  end
  @cid = 0;  @excep = [];  @running = true
  while @running do
    print @context.class.to_s+":"[email protected]_s+"<<"
	@input = gets.chomp
    if @input.to_s.downcase == "exit";  @running = false;  @res = "Stopping shell."
    else
	  begin;  @res = @context.instance_eval(@input)
	  rescue => e;  @res = "Exception: "+e.to_s+"\n"+e.backtrace.join("\n")
	  end
	end
	print @context.class.to_s+":"[email protected]_s+">> "[email protected]_s+"\n"
	@cid += 1
  end
end
def stop
  if @running == false;  return false;  end
  @running = false
end

start