bug#10494: 24.0.92; Syntax table and non-ASCII character interaction

[npostavs]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: npostavs@users.sourceforge.net
>> Cc: 10494@debbugs.gnu.org,  aaronecay@gmail.com
>> Date: Sat, 13 Aug 2016 10:19:34 -0400
>> 
>> >>     (modify-syntax-entry ?’ "w" text-mode-syntax-table)
>> >>     (defconst my-text-char-script-table
>> >>       (let ((table (copy-sequence char-script-table)))
>> >>         (aset table ?’ 'latin)
>> >>         table))
>> >> 
>> >>     (defun my-text-mode-hook ()
>> >>       (set (make-local-variable 'char-script-table)
>> >>            my-text-char-script-table))
>> >>     (add-hook 'text-mode-hook 'my-text-mode-hook)
>> >
>> > Are you sure nothing in text-mode will ever want to use \s_ in any
>> > regexp?
>> 
>> Did you mean \> (word boundary) or \s. (punctation)?  \s_ doesn't match
>> ’ regardless because its syntax class is punctuation, not symbol.
>
> Sorry, I guess I was thinking of \cl.  It will not match ’, although
> it might be expected.

Which could be fixed by (modify-category-entry ?’ ?l).

I would suggest this additional docstring patch, because I was confused
at first as to what CATEGORY was supposed to be (I looked around a bit
for how to create some kind of "category object"):

diff --git i/src/category.c w/src/category.c
index 4397f66..31ac2ec 100644
--- i/src/category.c
+++ w/src/category.c
@@ -336,6 +336,7 @@ DEFUN ("modify-category-entry", Fmodify_category_entry,
 the current buffer's category table.
 CHARACTER can be either a single character or a cons representing the
 lower and upper ends of an inclusive character range to modify.
+CATEGORY must be a category name (a character between ` ' and `~').
 If optional fourth argument RESET is non-nil,
 then delete CATEGORY from the category set instead of adding it.  */)
   (Lisp_Object character, Lisp_Object category, Lisp_Object table, Lisp_Object 
reset)

>
> Anyway, my point is that these char-tables should really be treated as
> read-only by Lisp applications.

Right, but I think this bug is about the user modifying stuff.