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# frozen_string_literal: true
module Html2rss
module ItemExtractors
##
# Returns the value of the +href+ attribute.
# It always returns absolute URLs. If the extracted +href+ value is a
# relative URL, it prepends the channel's URL.
#
# Imagine this +a+ HTML element with a +href+ attribute:
#
# <a href="/posts/latest-findings">...</a>
#
# YAML usage example:
# channel:
# url: http://blog-without-a-feed.example.com
# ...
# selectors:
# link:
# selector: a
# extractor: href
#
# Would return:
# 'http://blog-without-a-feed.example.com/posts/latest-findings'
class Href
# The available options for the href (attribute) extractor.
Options = Struct.new('HrefOptions', :selector, :channel, keyword_init: true)
##
# Initializes the Href extractor.
#
# @param xml [Nokogiri::XML::Element]
# @param options [Options]
def initialize(xml, options)
@options = options
@element = ItemExtractors.element(xml, options.selector)
@href = @element.attr('href').to_s
end
##
# Retrieves and returns the normalized absolute URL.
#
# @return [String] The absolute URL.
def get
return nil unless @href
sanitized_href = Html2rss::Utils.sanitize_url(@href)
Html2rss::Utils.build_absolute_url_from_relative(sanitized_href, @options.channel.url)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems