1 /* Previous grapheme cluster test.
2 Copyright (C) 2010-2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. */
31 test_u16_grapheme_prev (size_t len
, ...)
43 int unit
= va_arg (args
, int);
46 else if (n
>= sizeof s
/ sizeof *s
)
54 prev
= u16_grapheme_prev (end
, s
);
55 if (prev
!= end
- len
)
60 fputs ("u16_grapheme_prev returned NULL", stderr
);
62 fprintf (stderr
, "u16_grapheme_prev skipped %zu units", end
- prev
);
63 fprintf (stderr
, ", expected %zu:\n", len
);
64 for (i
= 0; i
< n
; i
++)
65 fprintf (stderr
, " %04x", s
[i
]);
74 static const uint16_t s
[] = { 'a', 'b', 'c' };
77 ASSERT (u16_grapheme_prev (NULL
, NULL
) == NULL
);
78 ASSERT (u16_grapheme_prev (s
, s
) == NULL
);
80 /* Standalone 1-unit graphemes. */
81 test_u16_grapheme_prev (1, 'a', -1);
82 test_u16_grapheme_prev (1, 'a', 'b', -1);
83 test_u16_grapheme_prev (1, 'a', 'b', 'c', -1);
85 /* Multi-unit, single code point graphemes. */
86 #define HIRAGANA_A 0x3042 /* あ: Hiragana letter 'a'. */
87 test_u16_grapheme_prev (1, HIRAGANA_A
, -1);
88 test_u16_grapheme_prev (1, HIRAGANA_A
, 'x', -1);
89 test_u16_grapheme_prev (1, HIRAGANA_A
, HIRAGANA_A
, -1);
91 /* Combining accents. */
92 #define GRAVE 0x0300 /* Combining grave accent. */
93 #define ACUTE 0x0301 /* Combining acute accent. */
94 test_u16_grapheme_prev (2, 'e', ACUTE
, -1);
95 test_u16_grapheme_prev (3, 'e', ACUTE
, GRAVE
, -1);
96 test_u16_grapheme_prev (1, 'e', ACUTE
, 'x', -1);
97 test_u16_grapheme_prev (2, 'e', ACUTE
, 'e', ACUTE
, -1);
99 /* Surrogate pairs. */
100 test_u16_grapheme_prev (2, 0xd83d, 0xde10, -1); /* 😐: neutral face. */
101 test_u16_grapheme_prev (3, 0xd83d, 0xde10, GRAVE
, -1);