ackintosh/gist:4010931

## gistfile1.rb
class Report
  attr_reader :title, :text
  attr_accessor :formatter

  def initialize(&formatter)
    @title = 'report title'
    @text = ['text1', 'text2', 'text3']
    @formatter = formatter
  end

  def output_report
    @formatter.call(self)
  end
end

HTML_FORMATTER = lambda do |context|
  puts "<html><head><title>#{context.title}</title></head>"
  puts '<body>'
  context.text.each do |line|
    puts "<p>#{line}</p>"
  end
  puts '</body></html>'
end

report = Report.new(&HTML_FORMATTER)
report.output_report
# <html><head><title>report title</title></head>
# <body>
# <p>text1</p>
# <p>text2</p>
# <p>text3</p>
# </body></html>


PLAIN_FORMATTER = lambda do |context|
  puts "*** #{report.title} ***"
  report.text.each do |line|
    puts(line)
  end
end

report.formatter = PLAIN_FORMATTER
report.output_report
# *** report title ***
# text1
# text2
# text3
	class Report
	attr_reader :title, :text
	attr_accessor :formatter

	def initialize(&formatter)
	@title = 'report title'
	@text = ['text1', 'text2', 'text3']
	@formatter = formatter
	end

	def output_report
	@formatter.call(self)
	end
	end

	HTML_FORMATTER = lambda do \|context\|
	puts "<html><head><title>#{context.title}</title></head>"
	puts '<body>'
	context.text.each do \|line\|
	puts "<p>#{line}</p>"
	end
	puts '</body></html>'
	end

	report = Report.new(&HTML_FORMATTER)
	report.output_report
	# <html><head><title>report title</title></head>
	# <body>
	# <p>text1</p>
	# <p>text2</p>
	# <p>text3</p>
	# </body></html>


	PLAIN_FORMATTER = lambda do \|context\|
	puts "* #{report.title} *"
	report.text.each do \|line\|
	puts(line)
	end
	end

	report.formatter = PLAIN_FORMATTER
	report.output_report
	# * report title *
	# text1
	# text2
	# text3