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bug#23097: 24.5; ispell.el: lines with both CASECHARS and NOT-CASECHARS


From: Nikolay Kudryavtsev
Subject: bug#23097: 24.5; ispell.el: lines with both CASECHARS and NOT-CASECHARS get sent to the spell checker
Date: Wed, 23 Mar 2016 21:11:19 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

Each entry ispell-dictionary-alist has elements called CASECHARS and NOT-CASECHARS. They are used for defining what gets sent to the spell checker and what does not.

One use case for them is that, if you have two dictionaries for languages with totally different alphabets, you can spellcheck a file where both languages are mixed together. In theory.

Here's what happens in practice:
If line contains only CASECHARS, it gets sent to the spell checker.
If line contains only NOT-CASECHARS, it does not get sent to the spell checker. If line contains both CASECHARS and NOT-CASECHARS, the whole line gets sent to the spell checker.

Sending the whole line makes NOT-CASECHARS pretty useless. I think the reasonable behavior in this case would be sending the line word by word.

Here's how to repeat this with aspell.
1. Starting from emacs -Q eval this:
(setq ispell-program-name "aspell")
(defun ispell-set-my-dictionaries()
(setq ispell-dictionary-alist (delq (assoc "english" ispell-dictionary-alist) ispell-dictionary-alist))
  (add-to-list 'ispell-dictionary-alist
'("english" "[kcat]" "[dogh]" "[']" nil ("-B") nil iso-8859-1))) (advice-add 'ispell-set-spellchecker-params :after #'ispell-set-my-dictionaries)
2. ispell-change-dictionary to english.
3. ispell-buffer a buffer containing this:
kat
doh
kat doh

"Kat" at the first line would get sent to aspell, since it passes CASECHARS. This is fine. "Doh" at the second line would be ignored, since it's not in CASECHARS. This is fine too. At the line with both words, not only "kat" would get sent, but also "doh" and that's what we don't want to happen.

--
Best Regards,
Nikolay Kudryavtsev






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