class ActionView::PathResolver

def build_query(path, details)
  query = @pattern.dup
  prefix = path.prefix.empty? ? "" : "#{escape_entry(path.prefix)}\\1"
  query.gsub!(/\:prefix(\/)?/, prefix)
  partial = escape_entry(path.partial? ? "_#{path.name}" : path.name)
  query.gsub!(/\:action/, partial)
  details.each do |ext, variants|
    query.gsub!(/\:#{ext}/, "{#{variants.compact.uniq.join(',')}}")
  end
  File.expand_path(query, @path)
end