Fixes #283 #284
Fixes #283 #284
Conversation
…rrent one is not.
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Hello! Unfortunately, the patch you proposed introduces a regression and breaks the "parser_textTest" unit test, at 3 places:
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Right, I forgot about the tests. I think this bug can't be resolved without breaking other parts. As per RFC2047 spaces between adjacent encoded words are just separators but not meant to be displayed. A space between an encoded word and a regular ASCII text is not just a separator but also meant to be displayed. The problem is that As RFC2047 says:
In conclusion, it might be better to put a warning in the comments of |
```
mailbox(text("Test München West", charsets::UTF_8), "a@b.de").generate();
```
produces
```
=?us-ascii?Q?Test_?= =?utf-8?Q?M=C3=BCnchen?= =?us-ascii?Q?West?= <test@example.com>
```
The first space between ``Test`` and ``München`` is encoded as an
underscore along with the first word: ``Test_``. The second space
between ``München`` and ``West`` is encoded with neither of the two
words and thus lost. Decoding the text results in ``Test
MünchenWest`` instead of ``Test München West``.
This is caused by how ``vmime::text::createFromString()`` handles
transitions between 7-bit and 8-bit words: If an 8-bit word follows a
7-bit word, a space is appended to the previous word. The opposite
case of a 7-bit word following an 8-bit word *misses* this behaviour.
When one fixes this problem, a follow-up issue appears:
``text::createFromString("a b\xFFc d")`` tokenizes the input into
``m_words={word("a "), word("b\xFFc ", utf8), word("d")}``. This
"right-side alignment" nature of the whitespace is a problem for
word::generate():
As per RFC 2047, spaces between adjacent encoded words are just
separators but not meant to be displayed. A space between an encoded
word and a regular ASCII text is not just a separator but also meant
to be displayed.
When word::generate() outputs the b-word, it would have to strip one
space, but only when there is a transition from encoded-word to
unencoded word. word::generate() does not know whether d will be
encoded or unencoded.
The idea now is that we could change the tokenization of
``text::createFromString`` such that whitespace is at the *start* of
words rather than at the end. With that, word::generate() need not
know anything about the next word, but rather only the *previous*
one.
Thus, in this patch,
1. The tokenization of ``text::createFromString`` is changed to
left-align spaces and the function is fixed to account for
the missing space on transition.
2. ``word::generate`` learns how to steal a space character.
3. Testcases are adjusted to account for the shifted
position of the space.
Fixes: #283, #284
Co-authored-by: Vincent Richard <vincent@vincent-richard.net>
Prevents the loss of a space if the previous word is 8-bit but the current one is not. This equals the case of the current word being 8-bit but not the previous one.