kopylovvlad · September 16, 2017 10:40
diff --git a/template_method.rb b/template_method.rb
 class Item
  attr_reader :title, :description, :price
  def initialize(arg = {})
    @title = arg[:title]
    @description = arg[:description]
    @price = arg[:price]
  end
 end

 class AbstractReport
  attr_reader :title, :items
  def initialize(arg = {})
    @title = arg[:title]
    @items = arg[:items]
  end

  def create_report
    main_template
      .gsub(/%items_placeholder%/, items_string_array.join(joiner))
      .gsub(/%report_title%/, title)
  end

  private

  def items_string_array
    items.map do |item|
      item_template
        .gsub(/%title%/, item.title)
        .gsub(/%description%/, item.description)
        .gsub(/%price%/, item.price)
    end
  end

  def joiner
    ''
  end

  def main_template
    raise 'Called abstract method: main_template'
  end

  def item_template
    raise 'Called abstract method: item_template'
  end
 end

 class TextReport < AbstractReport
  def main_template
    [
      'Text Report.',
      'Report title: %report_title%',
      'Items are:',
      '%items_placeholder%'
    ].join("\n")
  end

  def item_template
    [
      'Item:',
      "title: '%title%',",
      "description: '%description%',",
      "price: '%price%'\n"
    ].join("\n")
  end
 end

 class JSONReport < AbstractReport
  def main_template
    "{\"type\":\"JSON Report\",\"title\":\"%report_title%\",\"items\":[%items_placeholder%]}"
  end

  def item_template
    "{\"title\":\"%title%\",\"description\":\"%description%\",\"price\":\"%price%\"}"
  end

  def joiner
    ','
  end
 end

 class HTMLReport < AbstractReport;
  def main_template
    [
      '<!DOCTYPE html>',
      '<html>',
      ' <head>',
      '  <meta charset="utf-8">',
      '  <title>%report_title%</title>',
      ' </head>',
      ' <body>',
      '  <div>',
      '    %items_placeholder%',
      '  </div>',
      ' </body>',
      '</html>'
    ].join("\n")
  end

  def item_template
    [
      '<p>',
      '      <span>title: %title%</span>',
      '      <span>description: %description%</span>',
      '      <span>price: %price%</span>',
      "    <p>"
    ].join("\n")
  end
 end

 PARAMS = {
  title: 'Report for 3 items',
  items: [
    Item.new(title: 'Item 1', description: 'It is not nice item', price: '10'),
    Item.new(title: 'Item 2', description: 'Not bad', price: '20'),
    Item.new(title: 'Item 3', description: 'Very good item', price: '30')
  ]
 }

 puts TextReport.new(PARAMS).create_report
 =begin
 Text Report.
 Report title: Report for 3 items
 Items are:
 Item:
 title: 'Item 1',
 description: 'It is not nice item',
 price: '10'
 Item:
 title: 'Item 2',
 description: 'Not bad',
 price: '20'
 Item:
 title: 'Item 3',
 description: 'Very good item',
 price: '30'
 =end

 puts JSONReport.new(PARAMS).create_report
 #{"type":"JSON Report","title":"Report for 3 items","items":[{"title":"Item 1","description":"It is not nice item","price":"10"},{"title":"Item 2","description":"Not bad","price":"20"},{"title":"Item 3","description":"Very good item","price":"30"}]}

 puts HTMLReport.new(PARAMS).create_report
 =begin
 <!DOCTYPE html>
 <html>
 <head>
  <meta charset="utf-8">
  <title>Report for 3 items</title>
 </head>
 <body>
  <div>
    <p>
      <span>title: Item 1</span>
      <span>description: It is not nice item</span>
      <span>price: 10</span>
    <p><p>
      <span>title: Item 2</span>
      <span>description: Not bad</span>
      <span>price: 20</span>
    <p><p>
      <span>title: Item 3</span>
      <span>description: Very good item</span>
      <span>price: 30</span>
    <p>
  </div>
 </body>
 </html>
 =end
	class Item
	attr_reader :title, :description, :price
	def initialize(arg = {})
	@title = arg[:title]
	@description = arg[:description]
	@price = arg[:price]
	end
	end

	class AbstractReport
	attr_reader :title, :items
	def initialize(arg = {})
	@title = arg[:title]
	@items = arg[:items]
	end

	def create_report
	main_template
	.gsub(/%items_placeholder%/, items_string_array.join(joiner))
	.gsub(/%report_title%/, title)
	end

	private

	def items_string_array
	items.map do \|item\|
	item_template
	.gsub(/%title%/, item.title)
	.gsub(/%description%/, item.description)
	.gsub(/%price%/, item.price)
	end
	end

	def joiner
	''
	end

	def main_template
	raise 'Called abstract method: main_template'
	end

	def item_template
	raise 'Called abstract method: item_template'
	end
	end

	class TextReport < AbstractReport
	def main_template
	[
	'Text Report.',
	'Report title: %report_title%',
	'Items are:',
	'%items_placeholder%'
	].join("\n")
	end

	def item_template
	[
	'Item:',
	"title: '%title%',",
	"description: '%description%',",
	"price: '%price%'\n"
	].join("\n")
	end
	end

	class JSONReport < AbstractReport
	def main_template
	"{\"type\":\"JSON Report\",\"title\":\"%report_title%\",\"items\":[%items_placeholder%]}"
	end

	def item_template
	"{\"title\":\"%title%\",\"description\":\"%description%\",\"price\":\"%price%\"}"
	end

	def joiner
	','
	end
	end

	class HTMLReport < AbstractReport;
	def main_template
	[
	'<!DOCTYPE html>',
	'<html>',
	' <head>',
	' <meta charset="utf-8">',
	' <title>%report_title%</title>',
	' </head>',
	' <body>',
	' <div>',
	' %items_placeholder%',
	' </div>',
	' </body>',
	'</html>'
	].join("\n")
	end

	def item_template
	[
	'<p>',
	' <span>title: %title%</span>',
	' <span>description: %description%</span>',
	' <span>price: %price%</span>',
	" <p>"
	].join("\n")
	end
	end

	PARAMS = {
	title: 'Report for 3 items',
	items: [
	Item.new(title: 'Item 1', description: 'It is not nice item', price: '10'),
	Item.new(title: 'Item 2', description: 'Not bad', price: '20'),
	Item.new(title: 'Item 3', description: 'Very good item', price: '30')
	]
	}

	puts TextReport.new(PARAMS).create_report
	=begin
	Text Report.
	Report title: Report for 3 items
	Items are:
	Item:
	title: 'Item 1',
	description: 'It is not nice item',
	price: '10'
	Item:
	title: 'Item 2',
	description: 'Not bad',
	price: '20'
	Item:
	title: 'Item 3',
	description: 'Very good item',
	price: '30'
	=end

	puts JSONReport.new(PARAMS).create_report
	#{"type":"JSON Report","title":"Report for 3 items","items":[{"title":"Item 1","description":"It is not nice item","price":"10"},{"title":"Item 2","description":"Not bad","price":"20"},{"title":"Item 3","description":"Very good item","price":"30"}]}

	puts HTMLReport.new(PARAMS).create_report
	=begin
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Report for 3 items</title>
	</head>
	<body>
	<div>
	<p>
	<span>title: Item 1</span>
	<span>description: It is not nice item</span>
	<span>price: 10</span>
	<p><p>
	<span>title: Item 2</span>
	<span>description: Not bad</span>
	<span>price: 20</span>
	<p><p>
	<span>title: Item 3</span>
	<span>description: Very good item</span>
	<span>price: 30</span>
	<p>
	</div>
	</body>
	</html>
	=end