53 lines
1.8 KiB
Ruby
53 lines
1.8 KiB
Ruby
|
require 'rexml/document'
|
||
|
|
require 'rss'
|
||
|
|
|
||
|
|
class FeedElementInstaller
|
||
|
|
private_class_method :new
|
||
|
|
|
||
|
|
def self.install(element_name, feed)
|
||
|
|
# RSS Specification at http://cyber.harvard.edu/rss/rss.html#extendingRss
|
||
|
|
# > A RSS feed may contain [non-standard elements], only if those elements are *defined in a namespace*
|
||
|
|
|
||
|
|
new(element_name, feed).install if element_name.include?(':')
|
||
|
|
end
|
||
|
|
|
||
|
|
attr_reader :feed, :original_name, :element_namespace, :element_name, :element_accessor
|
||
|
|
|
||
|
|
def initialize(element_name, feed)
|
||
|
|
@feed = feed
|
||
|
|
@original_name = element_name
|
||
|
|
@element_namespace, @element_name = *element_name.split(':')
|
||
|
|
@element_accessor = "#{@element_namespace}_#{@element_name}"
|
||
|
|
end
|
||
|
|
|
||
|
|
def element_uri
|
||
|
|
@element_uri ||= REXML::Document.new(feed).root&.attributes&.namespaces&.fetch(@element_namespace, '') || ''
|
||
|
|
end
|
||
|
|
|
||
|
|
def install
|
||
|
|
install_in_rss unless installed_in_rss?
|
||
|
|
install_in_atom unless installed_in_atom?
|
||
|
|
end
|
||
|
|
|
||
|
|
private
|
||
|
|
|
||
|
|
def install_in_rss
|
||
|
|
RSS::Rss::Channel::Item.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
|
||
|
|
RSS::BaseListener.install_get_text_element(element_uri, element_name, element_accessor)
|
||
|
|
end
|
||
|
|
|
||
|
|
def install_in_atom
|
||
|
|
RSS::Atom::Entry.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
|
||
|
|
RSS::Atom::Feed::Entry.install_text_element(element_name, element_uri, '?', element_accessor, nil, original_name)
|
||
|
|
RSS::BaseListener.install_get_text_element(element_uri, element_name, element_accessor)
|
||
|
|
end
|
||
|
|
|
||
|
|
def installed_in_rss?
|
||
|
|
RSS::Rss::Channel::Item.method_defined?(element_accessor)
|
||
|
|
end
|
||
|
|
|
||
|
|
def installed_in_atom?
|
||
|
|
RSS::Atom::Entry.method_defined?(element_accessor) || RSS::Atom::Feed::Entry.method_defined?(element_accessor)
|
||
|
|
end
|
||
|
|
end
|