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# frozen_string_literal: true
class DeviceDetector
class MetadataExtractor < Struct.new(:user_agent, :regex_meta)
def call
regex_meta.any? ? extract_metadata : nil
end
private
def metadata_string
message = "#{name} (a child of MetadataExtractor) must implement the '#{__method__}' method."
raise NotImplementedError, message
end
def extract_metadata
user_agent.match(regex) do |match_data|
metadata_string.gsub(/\$(\d)/) do
match_data[Regexp.last_match(1).to_i].to_s
end.strip
end
end
def regex
@regex ||= regex_meta[:regex]
end
end
end
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