134 def person(author):

   135     """Returns the name before an email address,

   136     interpreting it as per RFC 5322

   137 

   138     >>> person(b'foo@bar')

   139     'foo'

   140     >>> person(b'Foo Bar <foo@bar>')

   141     'Foo Bar'

   142     >>> person(b'"Foo Bar" <foo@bar>')

   143     'Foo Bar'

   144     >>> person(b'"Foo \"buz\" Bar" <foo@bar>')

   145     'Foo "buz" Bar'

   146     >>> # The following are invalid, but do exist in real-life

   147     ...

   148     >>> person(b'Foo "buz" Bar <foo@bar>')

   149     'Foo "buz" Bar'

   150     >>> person(b'"Foo Bar <foo@bar>')

   151     'Foo Bar'

   152     """

   153     if '@' not in author:

   154         return author

   155     f = author.find('<')

   156     if f != -1:

   157         return author[:f].strip(' "').replace('\\"', '"')

   158     f = author.find('@')

   159     return author[:f].replace('.', ' ')

   160