Created
March 26, 2013 10:30
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| require_relative "inet2" | |
| cart = Cart.new(ARGV.delete_at(0)) | |
| ARGV.each do |a| | |
| @items.each { |i| cart.add_items(i) if a == i.name } | |
| end | |
| cart.read_from_file | |
| cart.save_to_file |
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| class Cart | |
| attr_reader :items | |
| include ItemContainer | |
| def initialize(owner) | |
| @items = Array.new | |
| @owner = owner | |
| end | |
| def save_to_file | |
| File.open("#{@owner}_cart.txt" , "w") do |f| | |
| @items.each{ |i| f.puts i} | |
| end | |
| end | |
| def read_from_file | |
| File.readlines("#{@owner}_cart.txt").each {|i| @items << i.to_real_item} | |
| @items.uniq! | |
| rescue Errno::ENOENT | |
| File.open("#{@owner}_cart.txt" , "w") {} | |
| puts "file #{@owner}_cart.txt created" | |
| end | |
| end |
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| require_relative "string" | |
| require_relative "item_container" | |
| require_relative "cart" | |
| require_relative "item" | |
| require_relative "order" | |
| require_relative "virtual_item" | |
| require_relative "real_item" | |
| @items = [] | |
| @items<< RealItem.new( { :price=>109, :weight=>100, :name=> "car"} ) | |
| @items<< RealItem.new( { :price=>101, :weight=>100, :name=> "kettle"} ) | |
| @items<< RealItem.new( { :weight=>100, :name=> "dishwasher", :price=>100} ) | |
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| class Item | |
| @@discount = 0.05 | |
| def self.discount | |
| if Time.now.month == 3 | |
| return @@discount +0.1 | |
| else | |
| return @@discount | |
| end | |
| end | |
| def initialize(options={}) | |
| @real_price = options[:price] | |
| @name = options[:name] | |
| end | |
| def info | |
| yield(price) | |
| yield(name) | |
| end | |
| attr_reader :real_price, :name | |
| attr_writer :price | |
| def price | |
| (@real_price - @real_price*self.class.discount) + tax if @real_price | |
| end | |
| def to_s | |
| "#{self.name}:#{self.price}:#{self.weight}" | |
| end | |
| private | |
| def tax | |
| type_tax = if self.class == VirtualItem | |
| 1 | |
| else | |
| 2 | |
| end | |
| cost_tax = if @real_price>5 | |
| @real_price*0.2 | |
| else | |
| @real_price*0.1 | |
| end | |
| cost_tax +type_tax | |
| end | |
| end |
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| module ItemContainer | |
| module ClassMethods | |
| def min_price | |
| 50 | |
| end | |
| end | |
| module InstantMethods | |
| def add_items(item) | |
| unless item.price < self.class.min_price | |
| @items.push item | |
| end | |
| end | |
| def remove_item | |
| @items.pop | |
| end | |
| def validate | |
| @items.each{ |i| puts "Item has no price" if i.price.nil? } | |
| end | |
| def delete_invalid_items | |
| @items.delete_if { |i| i.price.nil? } | |
| end | |
| def count_valid_items | |
| @items.count { |i| i.price } | |
| end | |
| end | |
| def self.included(base) | |
| base.extend ClassMethods | |
| base.class_eval do | |
| include InstantMethods | |
| end | |
| end | |
| end |
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| class RealItem < Item | |
| attr_reader :weight | |
| attr_writer :weight | |
| def initialize(options ) | |
| @weight = options [:weight] | |
| super | |
| end | |
| def info | |
| yield (weight) | |
| super | |
| end | |
| end |
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| class String | |
| def to_real_item | |
| fields = self.chomp | |
| fields = fields.split(":") | |
| RealItem.new(name: fields[0], price: fields[1].to_i, weight: fields[2].to_i) | |
| end | |
| end |
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| class VirtualItem < Item | |
| end |
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