def initialize(prev_sq, fmt)

@prev_sq = prev_sq

@fmt = fmt

@shown = prev_sq.nil? || $opt_all_ruby_show_dup

@content = String.new

@status = nil

end

attr_reader :prev_sq, :content, :status, :shown

def drop_prev

@prev_sq = nil

end

def difference_found

if @prev_sq

@prev_sq.force_output

end

@shown = true

end

def start

if @prev_sq &&

@prev_sq.prev_sq &&

@prev_sq.prev_sq.prev_sq

if @prev_sq.prev_sq.prev_sq.shown &&

!@prev_sq.prev_sq.shown &&

!@prev_sq.shown

@fmt.output_dots

end

@prev_sq.prev_sq.drop_prev

end

return @fmt.start if @shown

end

def output_data(s)

@content << s

return @fmt.output_data(s) if @shown

return if @prev_sq.content.start_with? @content

difference_found

@fmt.start

@fmt.output_data(@content)

end

def show_status(status)

@status = status

return @fmt.show_status(status) if @shown

return if @prev_sq.content == @content &&

@prev_sq.status == status

difference_found

@fmt.start

@fmt.output_data(@content)

@fmt.show_status(@status)

end

def last_linebreak

return @fmt.last_linebreak if @shown

end

def force_output

return if @shown

if @prev_sq &&

@prev_sq.prev_sq &&

@prev_sq.prev_sq.shown &&

!@prev_sq.shown

@fmt.output_dots

end

@shown = true

@fmt.start

@fmt.output_data(@content)

@fmt.show_status(@status)

@fmt.last_linebreak

end