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/* Word breaks in UTF-8/UTF-16/UTF-32 strings. -*- coding: utf-8 -*-
Copyright (C) 2009-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
/* This file implements section 4 "Word Boundaries"
of Unicode Standard Annex #29 <https://www.unicode.org/reports/tr29/>. */
void
FUNC (const UNIT *s, size_t n, char *p)
{
if (n > 0)
{
const UNIT *s_end = s + n;
/* Word break property of the last character.
-1 at the very beginning of the string. */
int last_char_prop = -1;
/* Format and Extend characters are ignored; this means, the mostly used
unit is the complex character (= character with subsequent ignored
characters).
Word break property of the last complex character.
-1 at the very beginning of the string. */
int last_compchar_prop = -1;
char *last_compchar_ptr = NULL;
/* For recognizing rules involving 3 complex characters:
Word break property of the second-to-last complex character.
-1 at the very beginning of the string. */
int secondlast_compchar_prop = -1;
/* Number of consecutive regional indicator (RI) characters seen
immediately before the current point. */
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_UNSAFE (&uc, s, s_end - s);
int prop = uc_wordbreak_property (uc);
/* No break at the start of the string. */
if (last_char_prop >= 0)
{
/* No break between CR and LF (WB3). */
if (last_char_prop == WBP_CR && prop == WBP_LF)
/* *p = 0 */;
/* Break before and after newlines (WB3a, WB3b). */
else if ((last_char_prop == WBP_CR
|| last_char_prop == WBP_LF
|| last_char_prop == WBP_NEWLINE)
|| (prop == WBP_CR
|| prop == WBP_LF
|| prop == WBP_NEWLINE))
*p = 1;
/* No break within emoji zwj sequence (WB3c). */
else if (last_char_prop == WBP_ZWJ
&& uc_is_property_extended_pictographic (uc))
/* *p = 0 */;
/* Keep horizontal whitespace together (WB3d). */
else if (last_char_prop == WBP_WSS && prop == WBP_WSS)
/* *p = 0 */;
/* Ignore Format and Extend characters (WB4). */
else if (prop == WBP_EXTEND
|| prop == WBP_FORMAT
|| prop == WBP_ZWJ)
/* *p = 0 */;
else
{
/* No break in these situations (see UAX #29):
secondlast last current
(ALetter | HL) (MidLetter | MidNumLet | SQ) × (ALetter | HL) (WB7)
(ALetter | HL) × (MidLetter | MidNumLet | SQ) (ALetter | HL) (WB6)
Numeric (MidNum | MidNumLet | SQ) × Numeric (WB11)
Numeric × (MidNum | MidNumLet | SQ) Numeric (WB12)
HL × DQ HL (WB7b)
HL DQ × HL (WB7c)
^ (RI RI)* RI × RI (WB15)
[^RI] (RI RI)* RI × RI (WB16)
*/
/* No break across certain punctuation. Also, disable word
breaks that were recognized earlier (due to lookahead of
only one complex character). */
if (((prop == WBP_ALETTER
|| prop == WBP_HL)
&& (last_compchar_prop == WBP_MIDLETTER
|| last_compchar_prop == WBP_MIDNUMLET
|| last_compchar_prop == WBP_SQ)
&& (secondlast_compchar_prop == WBP_ALETTER
|| secondlast_compchar_prop == WBP_HL))
|| (prop == WBP_NUMERIC
&& (last_compchar_prop == WBP_MIDNUM
|| last_compchar_prop == WBP_MIDNUMLET
|| last_compchar_prop == WBP_SQ)
&& secondlast_compchar_prop == WBP_NUMERIC)
|| (prop == WBP_HL
&& last_compchar_prop == WBP_DQ
&& secondlast_compchar_prop == WBP_HL))
{
*last_compchar_ptr = 0;
/* *p = 0; */
}
/* Break before RI, if odd number of RI's are
preceding (WB15, WB16). */
else if (last_compchar_prop == WBP_RI && prop == WBP_RI)
{
if (ri_count % 2 == 0)
*p = 1;
/* else *p = 0 */
}
/* Break after Format and Extend character. */
else if (last_compchar_prop == WBP_EXTEND
|| last_compchar_prop == WBP_FORMAT)
*p = 1;
else
{
int last_compchar_index =
uniwbrk_prop_index[last_compchar_prop];
int index = uniwbrk_prop_index[prop];
/* Break between unknown pair (WB999). */
if (last_compchar_index < 0 || index < 0)
*p = 1;
/* Perform a single table lookup. */
else if (uniwbrk_table[last_compchar_index][index])
*p = 1;
/* else *p = 0; */
}
}
}
last_char_prop = prop;
/* Ignore Format and Extend characters, except at the
start of the line (WB4). */
if (last_compchar_prop < 0
|| last_compchar_prop == WBP_CR
|| last_compchar_prop == WBP_LF
|| last_compchar_prop == WBP_NEWLINE
|| !(prop == WBP_EXTEND || prop == WBP_FORMAT || prop == WBP_ZWJ))
{
secondlast_compchar_prop = last_compchar_prop;
last_compchar_prop = prop;
last_compchar_ptr = p;
if (prop == WBP_RI)
ri_count++;
else
ri_count = 0;
}
s += count;
p += count;
}
}
}
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