Method: Textbringer::Buffer#delete_char

Defined in:
lib/textbringer/buffer.rb

#delete_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 626

def delete_char(n = 1)
  check_read_only_flag
  adjust_gap
  s = @point
  pos = get_pos(@point, n)
  if n > 0
    str = substring(s, pos)
    # fill the gap with NUL to avoid invalid byte sequence in UTF-8
    @contents.bytesplice(@gap_end...user_to_gap(pos), "\0" * (pos - @point))
    @gap_end += pos - @point
    @marks.each do |m|
      if m.location > pos
        m.location -= pos - @point
      elsif m.location > @point
        m.location = @point
      end
    end
    push_undo(DeleteAction.new(self, s, s, str))
    self.modified = true
  elsif n < 0
    str = substring(pos, s)
    update_line_and_column(@point, pos)
    # fill the gap with NUL to avoid invalid byte sequence in UTF-8
    @contents.bytesplice(user_to_gap(pos)...@gap_start, "\0" * (@point - pos))
    @marks.each do |m|
      if m.location >= @point
        m.location -= @point - pos
      elsif m.location > pos
        m.location = pos
      end
    end
    @point = @gap_start = pos
    push_undo(DeleteAction.new(self, s, pos, str))
    self.modified = true
  end
  @goal_column = nil
end