Re: case-table functions clobbering extra slots

[Kenichi Handa <handa@m17n.org>]

In article <E1CuvLc-0007j3-Ko@fencepost.gnu.org>, Richard Stallman <rms@gnu.org> writes:

>     Downcase of dotted-I is dotted-i (`i'), but, in
>     lang. env. other than Turkish, upcase of dotted-i must be
>     dotless-I (`I').  So we need
>       (set-downcase-syntax dotted-I dotted-i table)

> Ok, if we need them both, please add both.

I've just installed these changes:

o lisp/case-table.el
    Add set-upcase-syntax and set-downcase-syntax, modify
    th other function to maintain upcase table.

o lisp/international/characters.el, lisp/international/latin-5.el:
    Setup cases of GREEK-FINAL-SIGMA, Y-WITH-DIAERESIS, 
    I-WITH-DOT-ABOVE, DOTLESS-i.

o src/casefiddle.c:
    Enable casify_object to change characters of different
    byte size.  Fix casify_region to work on such a case
    correctly.

o src/insdel.c
    Fix bugs of replace_range_2.

Now, upcase/downcase commands on the above characters seems
to work correctly.

But, I found case-fold searching and regexp matching doesn't
work as expected.  For instance, searching for DOTLESS-i
ignores `i' and `I' but find I-WITH-DOT-ABOVE.  On the other
hand, all of the following returns nil:
  (staring-match "DOTLESS-i" "i")
  (staring-match "DOTLESS-i" "I")
  (staring-match "DOTLESS-i" "I-WITH-DOT-ABOVE")

It seems that this behaviour is because compile-pattern is
given a downcase table and search_buffer is given a canon
table and an equiv table, but I still don't understand
the underlying logic of this difference.

---
Ken'ichi HANDA
handa@m17n.org