diff options
Diffstat (limited to 'Lib/email/_header_value_parser.py')
| -rw-r--r-- | Lib/email/_header_value_parser.py | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Lib/email/_header_value_parser.py b/Lib/email/_header_value_parser.py index 7da1bbaf8a8..ec2215a5e5f 100644 --- a/Lib/email/_header_value_parser.py +++ b/Lib/email/_header_value_parser.py @@ -92,6 +92,8 @@ TOKEN_ENDS = TSPECIALS | WSP ASPECIALS = TSPECIALS | set("*'%") ATTRIBUTE_ENDS = ASPECIALS | WSP EXTENDED_ATTRIBUTE_ENDS = ATTRIBUTE_ENDS - set('%') +NLSET = {'\n', '\r'} +SPECIALSNL = SPECIALS | NLSET def quote_string(value): return '"'+str(value).replace('\\', '\\\\').replace('"', r'\"')+'"' @@ -2802,9 +2804,13 @@ def _refold_parse_tree(parse_tree, *, policy): wrap_as_ew_blocked -= 1 continue tstr = str(part) - if part.token_type == 'ptext' and set(tstr) & SPECIALS: - # Encode if tstr contains special characters. - want_encoding = True + if not want_encoding: + if part.token_type == 'ptext': + # Encode if tstr contains special characters. + want_encoding = not SPECIALSNL.isdisjoint(tstr) + else: + # Encode if tstr contains newlines. + want_encoding = not NLSET.isdisjoint(tstr) try: tstr.encode(encoding) charset = encoding |