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require 'forwardable'
require 'rss/rss'
module RSS
module Maker
module Base
def self.append_features(klass)
super
klass.module_eval(<<-EOC, __FILE__, __LINE__)
OTHER_ELEMENTS = []
NEED_INITIALIZE_VARIABLES = []
def self.inherited(subclass)
subclass.const_set("OTHER_ELEMENTS",
OTHER_ELEMENTS.dup)
subclass.const_set("NEED_INITIALIZE_VARIABLES",
NEED_INITIALIZE_VARIABLES.dup)
end
def self.add_other_element(variable_name)
const_get("OTHER_ELEMENTS") << variable_name
end
def self.other_elements
const_get("OTHER_ELEMENTS")
end
def self.add_need_initialize_variable(variable_name)
const_get("NEED_INITIALIZE_VARIABLES") << variable_name
end
def self.need_initialize_variables
const_get("NEED_INITIALIZE_VARIABLES")
end
EOC
end
def initialize(maker)
@maker = maker
initialize_variables
end
def have_required_values?
true
end
private
def initialize_variables
self.class.need_initialize_variables.each do |variable_name|
instance_eval("@#{variable_name} = nil", __FILE__, __LINE__)
end
end
def setup_other_elements(rss)
self.class.other_elements.each do |element|
__send__("setup_#{element}", rss, current_element(rss))
end
end
def setup_values(target)
set = false
if have_required_values?
variables.each do |var|
setter = "#{var}="
if target.respond_to?(setter)
value = self.__send__(var)
if value
target.__send__(setter, value)
set = true
end
end
end
end
set
end
def variables
self.class.need_initialize_variables
end
end
class RSSBase
include Base
class << self
def make(&block)
new.make(&block)
end
end
attr_reader :rss_version, :xml_stylesheets
attr_reader :channel, :image, :items, :textinput
attr_accessor :version, :encoding, :standalone
def initialize(rss_version)
super(self)
@rss_version = rss_version
@version = "1.0"
@encoding = "UTF-8"
@standalone = nil
@xml_stylesheets = make_xml_stylesheets
@channel = make_channel
@image = make_image
@items = make_items
@textinput = make_textinput
end
def make(&block)
block.call(self) if block
to_rss
end
def current_element(rss)
rss
end
private
def make_xml_stylesheets
XMLStyleSheets.new(self)
end
def make_channel
self.class::Channel.new(self)
end
def make_image
self.class::Image.new(self)
end
def make_items
self.class::Items.new(self)
end
def make_textinput
self.class::Textinput.new(self)
end
def setup_xml_stylesheets(rss)
@xml_stylesheets.to_rss(rss)
end
end
class XMLStyleSheets
include Base
extend Forwardable
def_delegators(:@xml_stylesheets, :<<, :[], :[]=, :first, :last)
def_delegators(:@xml_stylesheets, :push, :pop, :shift, :unshift)
def initialize(maker)
super
@xml_stylesheets = []
end
def to_rss(rss)
@xml_stylesheets.each do |xss|
xss.to_rss(rss)
end
end
def new_xml_stylesheet
xss = XMLStyleSheet.new(@maker)
@xml_stylesheets << xss
xss
end
class XMLStyleSheet
include Base
::RSS::XMLStyleSheet::ATTRIBUTES.each do |attribute|
attr_accessor attribute
add_need_initialize_variable(attribute)
end
def to_rss(rss)
xss = ::RSS::XMLStyleSheet.new
set = setup_values(xss)
if set
rss.xml_stylesheets << xss
end
end
end
end
class ChannelBase
include Base
attr_reader :cloud
%w(about title link description language copyright
managingEditor webMaster rating docs skipDays
skipHours date lastBuildDate category generator ttl
).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
def initialize(maker)
super
@cloud = make_cloud
end
def current_element(rss)
rss.channel
end
private
def make_cloud
self.class::Cloud.new(@maker)
end
class CloudBase
include Base
%w(domain port path registerProcedure protocol).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
def current_element(rss)
rss.channel.cloud
end
end
end
class ImageBase
include Base
%w(title url width height description).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
def link
@maker.channel.link
end
def current_element(rss)
rss.image
end
end
class ItemsBase
include Base
extend Forwardable
def_delegators(:@items, :<<, :[], :[]=, :first, :last)
def_delegators(:@items, :push, :pop, :shift, :unshift)
attr_accessor :sort
def initialize(maker)
super
@items = []
@sort = false
end
def normalize
sort_if_need
end
def current_element(rss)
rss.items
end
def new_item
item = self.class::Item.new(@maker)
@items << item
item
end
private
def sort_if_need
if @sort.respond_to?(:call)
@items.sort do |x, y|
@sort.call(x, y)
end
elsif @sort
@items.sort do |x, y|
y <=> x
end
else
@items
end
end
class ItemBase
include Base
%w(guid enclosure source category).each do |element|
attr_reader element
add_other_element(element)
module_eval(<<-EOC, __FILE__, __LINE__)
private
def setup_#{element}(rss, current)
@#{element}.to_rss(rss, current)
end
def make_#{element}
self.class::#{element[0,1].upcase}#{element[1..-1]}.new(@maker)
end
EOC
end
%w(title link description date author comments).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
def initialize(maker)
super
@guid = make_guid
@enclosure = make_enclosure
@source = make_source
@category = make_category
end
def <=>(other)
if @date and other.date
@date <=> other.date
elsif @date
1
elsif other.date
-1
else
0
end
end
def current_element(rss)
rss.items.last
end
class GuidBase
include Base
%w(isPermaLink content).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
end
class EnclosureBase
include Base
%w(url length type).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
end
class SourceBase
include Base
%w(url content).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
end
class CategoryBase
include Base
%w(domain content).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
end
end
end
class TextinputBase
include Base
%w(title description name link).each do |element|
attr_accessor element
add_need_initialize_variable(element)
end
def current_element(rss)
rss.textinput
end
end
end
end
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