vendor.rb

class TemplateProcessor
  attribute_reader :vendor_templates
  
  def initialize(templates)
    @vendor_template = templates
  end
  
  def process(code)
    vendor_templates.reduce(code) do |result, vendor_template|
        vendor_template.process(code)
    end
  end
  
#   vendor_template_id issues
  # one domain
  def domain
      @vendor_template.map(&:domain).first
  end
  # or join multi domain ??? 
   def domain
      @vendor_template.map(&:domain).join(',')
  end
end

### Modify vendor detect: 
def detect(code)
  candidates = @domains.values.select { |t| t.domain_matches?(code_or_url) }
  substitutable = candidates.select { |t| t.would_substitute?(code_or_url) }
  TemplateProcessor.new(substitutable)
end