GNU bug report logs - #18826
24.3.94; c++-mode bad indentation after programmatic insert with locally changed syntax table

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 18826 <at> debbugs.gnu.org
Subject: bug#18826: 24.3.94; c++-mode bad indentation after programmatic insert with locally changed syntax table
Date: Sun, 26 Oct 2014 13:03:44 -0400

>>> (with-syntax-table (make-char-table 'syntax-table nil)
>>> (modify-syntax-entry ?\( "(")
>>> (modify-syntax-entry ?\) ")")
>>> (modify-syntax-entry ?< "(")
>>> (modify-syntax-entry ?> ")")
>>> (insert "fgets(0, 1, 2)"))
>> 
>> Why do that?

> To include angle brackets in paren syntax class.

But `insert' doesn't use that temporary syntax-table (aside from
indirect use in before/after-change-functions, obviously).  So why use
`with-syntax-table' around a call to `insert'?

> It seems that I should only change the current syntax table only
> around the `backward-sexp' and `parse-partial-sexp' calls there, but
> not when doing any text modification.

Yes.  And even then, this should not be necessary since the major mode
already does it (or should do it) for you.


        Stefan

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