class Reline::LineEditor

def em_exchange_mark(key) 

def em_exchange_mark(key)
 unless @mark_pointer
inter = [@byte_pointer, @line_index]
ous_line_index = @line_index
pointer, @line_index = @mark_pointer
r = calculate_width(@line.byteslice(0, @byte_pointer))
r_max = calculate_width(@line)
pointer = new_pointer