class Grape::Middleware::Formatter

def mime_array
  accept = env[Grape::Http::Headers::HTTP_ACCEPT]
  return [] unless accept
  accept_into_mime_and_quality = %r{
    (
      \w+/[\w+.-]+)     # eg application/vnd.example.myformat+xml
    (?:
     (?:;[^,]*?)?       # optionally multiple formats in a row
     ;\s*q=([\w.]+)     # optional "quality" preference (eg q=0.5)
    )?
  }x
  vendor_prefix_pattern = /vnd\.[^+]+\+/
  accept.scan(accept_into_mime_and_quality)
        .sort_by { |_, quality_preference| -(quality_preference ? quality_preference.to_f : 1.0) }
        .flat_map { |mime, _| [mime, mime.sub(vendor_prefix_pattern, '')] }
end