Ralf Schlatterbeck <r...@runtux.com> added the comment:
maybe it would be a good start to include the examples at the end of RFC2047
into the regression tests? These examples at least support the case that a '?'
may immediately follow an encoded string:
encoded form displayed as
(=?ISO-8859-1?Q?a?= =?ISO-8859-1?Q?b?=) (ab)
when trying this in python 2.7:
>>> decode_header ('(=?ISO-8859-1?Q?a?= =?ISO-8859-1?Q?b?=)')
[('(', None), ('a', 'iso-8859-1'), ('=?ISO-8859-1?Q?b?=)', None)]
this fails. So I consider this a bug.
Note that although RFC2047 is vague concerning the interpretation if two
encoded strings could follow each other without a whitespace, these *are* seen
in the wild and *are* interpreted correctly by the mailers I've tested: mutt,
thunderbird, exchange in various versions, even lotus notes seems to get this
right. So I guess python should be "liberal in what you accept" and parse
something like
'(=?ISO-8859-1?Q?a?==?ISO-8859-1?Q?b?=)'
into
[ ('(', None)
, ('a', 'iso-8859-1')
, ('b', 'iso-8859-1')
, (')', None)
]
----------
nosy: +runtux
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