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/* Previous grapheme cluster test.
Copyright (C) 2010-2024 Free Software Foundation, Inc.
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/>. */
/* Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. */
#include <config.h>
/* Specification. */
#include <unigbrk.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include "macros.h"
static void
test_u16_grapheme_prev (size_t len, ...)
{
const uint16_t *prev;
const uint16_t *end;
uint16_t s[16];
va_list args;
size_t n;
va_start (args, len);
n = 0;
for (;;)
{
int unit = va_arg (args, int);
if (unit == -1)
break;
else if (n >= sizeof s / sizeof *s)
abort ();
s[n++] = unit;
}
va_end (args);
end = s + n;
prev = u16_grapheme_prev (end, s);
if (prev != end - len)
{
size_t i;
if (prev == NULL)
fputs ("u16_grapheme_prev returned NULL", stderr);
else
fprintf (stderr, "u16_grapheme_prev skipped %tu units", end - prev);
fprintf (stderr, ", expected %zu:\n", len);
for (i = 0; i < n; i++)
fprintf (stderr, " %04x", s[i]);
putc ('\n', stderr);
fflush (stderr);
abort ();
}
}
int
main (void)
{
static const uint16_t s[] = { 'a', 'b', 'c' };
/* Empty string. */
ASSERT (u16_grapheme_prev (NULL, NULL) == NULL);
ASSERT (u16_grapheme_prev (s, s) == NULL);
/* Standalone 1-unit graphemes. */
test_u16_grapheme_prev (1, 'a', -1);
test_u16_grapheme_prev (1, 'a', 'b', -1);
test_u16_grapheme_prev (1, 'a', 'b', 'c', -1);
/* Multi-unit, single code point graphemes. */
#define HIRAGANA_A 0x3042 /* あ: Hiragana letter 'a'. */
test_u16_grapheme_prev (1, HIRAGANA_A, -1);
test_u16_grapheme_prev (1, HIRAGANA_A, 'x', -1);
test_u16_grapheme_prev (1, HIRAGANA_A, HIRAGANA_A, -1);
/* Combining accents. */
#define GRAVE 0x0300 /* Combining grave accent. */
#define ACUTE 0x0301 /* Combining acute accent. */
test_u16_grapheme_prev (2, 'e', ACUTE, -1);
test_u16_grapheme_prev (3, 'e', ACUTE, GRAVE, -1);
test_u16_grapheme_prev (1, 'e', ACUTE, 'x', -1);
test_u16_grapheme_prev (2, 'e', ACUTE, 'e', ACUTE, -1);
/* Surrogate pairs. */
test_u16_grapheme_prev (2, 0xd83d, 0xde10, -1); /* 😐: neutral face. */
test_u16_grapheme_prev (3, 0xd83d, 0xde10, GRAVE, -1);
return test_exit_status;
}
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