module Roda::RodaPlugins::Assets::RequestClassMethods

def assets_matchers
  @assets_matchers ||= [:css, :js].map do |t|
    [t.to_s.freeze, assets_regexp(t)].freeze if roda_class.assets_opts[t]
  end.compact.freeze
end

def assets_regexp(type)
  o = roda_class.assets_opts
  if compiled = o[:compiled]
    assets = compiled.select{|k,_| k =~ /\A#{type}/}.map do |k, md|
      "#{k.sub(/\A#{type}/, '')}.#{md}.#{type}"
    end
    /#{o[:"compiled_#{type}_prefix"]}(#{Regexp.union(assets)})/
  else
    assets = unnest_assets_hash(o[type])
    /#{o[:"#{type}_prefix"]}(#{Regexp.union(assets.uniq)})#{o[:"#{type}_suffix"]}/
  end
end

def unnest_assets_hash(h)
  case h
  when Hash
    h.map do |k,v|
      assets = unnest_assets_hash(v)
      assets = assets.map{|x| "#{k}/#{x}"} if roda_class.assets_opts[:group_subdirs]
      assets
    end.flatten(1)
  else
    Array(h)
  end
end