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RE: C++ mode and c-beginning-of-current-token
From: |
Herbert Euler |
Subject: |
RE: C++ mode and c-beginning-of-current-token |
Date: |
Sat, 12 May 2007 23:30:07 +0800 |
I found some additional strange behaviors. First, the error in a
buffer would only be signaled once. If an error is already signaled,
typing again does not cause another same error get signaled, but
font-lock is broken after that. Normally, characters are assigned
with face property as they are typed. For example, when I type
#include in a c++-mode buffer, the whole word is assigned with
font-lock-preprocessor-face after the first letter, l, is typed (when
# is typed, face are not set). However, in the C++ buffer in which an
error has been signaled, font-lock does not work on the erroneous
region. The erroneous starts with the beginning of the buffer (where
the original error is signaled), and ends with a statement (defined
with `c-beginning-of-statement' and `c-end-of-statement'). For
example, suppose the first line of a buffer is as below (-!- is the
point position):
-!-#include <iostream>
#include <vector>
and no errors have been signaled. Now I type C-o, the buffer content
is now
-!-
#include <iostream>
#include <vector>
Now I type #, an error is signaled (this is slightly different from
typing in an empty buffer, in such a case the error is signaled when
typing i, rather than #). Now if I finish the first line as below:
#include <iostream>-!-
#include <iostream>
#include <vector>
The second #include <iostream> and content follows it is still
colored, while the first one is not. Text properties on the first
line are (c-in-sws t auto-composed t fontified t). If other content
are typed now, for example the following:
#include <iostream>
int
main ()
{
}
-!-
#include <iostream>
#include <vector>
all of them are not colored; text properties of the non-colored
content but the first line are (c-is-sws t auto-composed t fontified
t), and of the first line is changed to (c-is-sws t c-in-sws t
auto-composed t fontified t).
If I invoke `font-lock-fontify-region' on non-colored region manually,
they will be fontified correctly. Font-lock in other parts of the
buffer works, but is abnormal as usual. And there are other strange
behaviors, but they are too complicated for me to describe, so I
intend to describe only if you need.
Hope the above information helps. Thanks.
Regards,
Guanpeng Xu
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