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/* Grapheme cluster break function.
Copyright (C) 2010-2020 Free Software Foundation, Inc.
Written by Ben Pfaff <blp@cs.stanford.edu>, 2010.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
void
FUNC (const UNIT *s, size_t n, char *p)
{
if (n > 0)
{
const UNIT *s_end = s + n;
/* Grapheme Cluster break property of the last character.
-1 at the very beginning of the string. */
int last_char_prop = -1;
/* Grapheme Cluster break property of the last complex character.
-1 at the very beginning of the string. */
int last_compchar_prop = -1;
size_t ri_count = 0;
/* Don't break inside multibyte characters. */
memset (p, 0, n);
while (s < s_end)
{
ucs4_t uc;
int count = U_MBTOUC (&uc, s, s_end - s);
int prop = uc_graphemeclusterbreak_property (uc);
/* Break at the start of the string (GB1). */
if (last_char_prop < 0)
*p = 1;
else
{
/* No break between CR and LF (GB3). */
if (last_char_prop == GBP_CR && prop == GBP_LF)
/* *p = 0 */;
/* Break before and after newlines (GB4, GB5). */
else if ((last_char_prop == GBP_CR
|| last_char_prop == GBP_LF
|| last_char_prop == GBP_CONTROL)
|| (prop == GBP_CR
|| prop == GBP_LF
|| prop == GBP_CONTROL))
*p = 1;
/* No break between Hangul syllable sequences (GB6, GB7, GB8). */
else if ((last_char_prop == GBP_L
&& (prop == GBP_L
|| prop == GBP_V
|| prop == GBP_LV
|| prop == GBP_LVT))
|| ((last_char_prop == GBP_LV
|| last_char_prop == GBP_V)
&& (prop == GBP_V
|| prop == GBP_T))
|| ((last_char_prop == GBP_LVT
|| last_char_prop == GBP_T)
&& prop == GBP_T))
/* *p = 0 */;
/* No break before extending characters or ZWJ (GB9). */
else if (prop == GBP_EXTEND || prop == GBP_ZWJ)
/* *p = 0 */;
/* No break before SpacingMarks (GB9a). */
else if (prop == GBP_SPACINGMARK)
/* *p = 0 */;
/* No break after Prepend characters (GB9b). */
else if (last_char_prop == GBP_PREPEND)
/* *p = 0 */;
/* No break within emoji modifier sequences (GB10). */
else if ((last_compchar_prop == GBP_EB
|| last_compchar_prop == GBP_EBG)
&& prop == GBP_EM)
/* *p = 0 */;
/* No break within emoji zwj sequences (GB11). */
else if (last_char_prop == GBP_ZWJ
&& (prop == GBP_GAZ
|| prop == GBP_EBG))
/* *p = 0 */;
/* No break between RI if there is an odd number of RI
characters before (GB12, GB13). */
else if (prop == GBP_RI)
{
if (ri_count % 2 == 0)
*p = 1;
/* else *p = 0; */
}
/* Break everywhere (GBP999). */
else
*p = 1;
}
last_char_prop = prop;
if (!(prop == GBP_EXTEND
&& (last_compchar_prop == GBP_EB
|| last_compchar_prop == GBP_EBG)))
last_compchar_prop = prop;
if (prop == GBP_RI)
ri_count++;
else
ri_count = 0;
s += count;
p += count;
}
}
}
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