On 02/17/2017 08:26 PM, cecas...@aol.com wrote:
> David,
>
> I asked a question about this on the gtk-devel-list
>
> https://mail.gnome.org/archives/gtk-devel-list/2017-January/msg00018.html
>
> last month. A lot I didn't know about this. For UTF-8 it is a bit complicated
> even for English. For GTK's case in-sensitive search they use a casefold
> function and a normalizing function. This way you can do a case in-sensitive
> search on strings with ligatures and accents. If you are just sticking with
> asci english chars then just converting and comparing case should work. There
> is a bit more to it though for UTF-8 and unicode chars.
>
> I worked on this a little bit so that I could understand it better. My last
> attempt was
>
> https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/Csamples/search_textbuffer4.c
>
> The GTK developers are working on GTK4. GTK3.22 should be stable for 3. GTK2
> or 3 is fine with me.
>
> Eric
>
Thanks Eric,
I went though the GtkSourceView-3 code and was digesting the folding (slowly
digesting it). Yes, I'm using nothing but US ASCII set, though it is good to
incorporate (as I learn) the UTF-8 handing for other character sets.
I finally hit on something I like. I set several search options. I have
options for forward/backward search, search from cursor, search within
selected text, search whole words only. The following is the forward
case-insensitive search. The search term is provided in 'text' and I basically
just walk an iter over the search bounds and set the start and end iters
bracketing the matching term within the buffer. Seems to work fine:
else { /* search forward */
if (app->optcase) { /* case sensitive */
found = gtk_text_iter_forward_search (&iter, text, 0,
&mstart, &mend, NULL);
}
else { /* case insensitive */
gunichar c;
gchar *lctext = g_strdup (text); /* copy search text */
str2lower (lctext); /* convert to lower-case */
found = FALSE;
for (;;) {
gsize len = textlen; /* get char at iter */
c = g_unichar_tolower (gtk_text_iter_get_char (&iter));
if (c == (gunichar)lctext[0]) /* compare 1st in lctext */
{
mstart = iter; /* set start iter to current */
for (gsize i = 0; i < len; i++)
{
c = g_unichar_tolower (gtk_text_iter_get_char
(&iter));
/* compare/advance -- order IS important */
if (c != (gunichar)lctext[i] ||
!gtk_text_iter_forward_char (&iter))
goto next; /* start next search */
}
mend = iter; /* set end iter */
found = TRUE; /* found to true */
break;
}
next:; /* if at end of selecton break */
if (!gtk_text_iter_forward_char (&iter))
break;
}
if (lctext) g_free (lctext);
}
}
--
David C. Rankin, J.D.,P.E.
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