1 /* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
3 * Permission is hereby granted, free of charge, to any person
4 * obtaining a copy of this software and associated documentation
5 * files (the "Software"), to deal in the Software without
6 * restriction, including without limitation the rights to use, copy,
7 * modify, merge, publish, distribute, sublicense, and/or sell copies
8 * of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be
12 * included in all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
18 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
19 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 #include "telescope.h"
35 static const uint8_t utf8d[] = {
36 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
37 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
38 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
39 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
40 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
41 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
42 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
43 0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
44 0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
45 0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
46 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
47 1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
48 1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
49 1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1, // s7..s8
52 static inline uint32_t
53 decode(uint32_t* restrict state, uint32_t* restrict codep, uint8_t byte)
55 uint32_t type = utf8d[byte];
57 *codep = (*state != UTF8_ACCEPT) ?
58 (byte & 0x3fu) | (*codep << 6) :
59 (0xff >> type) & (byte);
61 *state = utf8d[256 + *state*16 + type];
66 /* end of the converter, utility functions ahead */
68 #define ZERO_WIDTH_SPACE 0x200B
70 /* public version of decode */
72 utf8_decode(uint32_t* restrict state, uint32_t* restrict codep, uint8_t byte)
74 return decode(state, codep, byte);
77 /* encode cp in s. s must be at least 4 bytes wide */
79 utf8_encode(uint32_t cp, char *s)
84 } else if (cp <= 0x7FF) {
85 s[1] = (uint8_t)(( cp & 0x3F ) + 0x80);
86 s[0] = (uint8_t)(((cp >> 6) & 0x1F) + 0xC0);
88 } else if (cp <= 0xFFFF) {
89 s[2] = (uint8_t)(( cp & 0x3F) + 0x80);
90 s[1] = (uint8_t)(((cp >> 6) & 0x3F) + 0x80);
91 s[0] = (uint8_t)(((cp >> 12) & 0x0F) + 0xE0);
93 } else if (cp <= 0x10FFFF) {
94 s[3] = (uint8_t)(( cp & 0x3F) + 0x80);
95 s[2] = (uint8_t)(((cp >> 6) & 0x3F) + 0x80);
96 s[1] = (uint8_t)(((cp >> 12) & 0x3F) + 0x80);
97 s[0] = (uint8_t)(((cp >> 18) & 0x07) + 0xF0);
106 utf8_nth(char *s, size_t n)
109 uint32_t cp = 0, state = 0;
111 for (i = 0; *s && i < n; ++s)
112 if (!decode(&state, &cp, *s))
115 if (state != UTF8_ACCEPT)
125 uint32_t cp = 0, state = 0;
130 if (!decode(&state, &cp, *s))
135 /* returns only 0, 1, 2 or 8. assumes sizeof(wchar_t) is 4 */
137 utf8_chwidth(uint32_t cp)
139 /* XXX: if we're running on a platform where sizeof(wchar_t)
140 * == 2 what to do? The manpage for wcwidth and wcs isn't
141 * clear about the encoding, but if it's 16 bit wide I assume
142 * it must use UTF-16... right? */
143 assert(sizeof(wchar_t) == 4);
146 * quick and dirty fix for the tabs. In the future we may
147 * want to expand tabs into N spaces, but for the time being
148 * this seems to be good enough (tm).
153 return wcwidth((wchar_t)cp);
156 /* NOTE: n is the number of codepoints, NOT the byte length. In
157 * other words, s MUST be NUL-terminated. */
159 utf8_snwidth(const char *s, size_t n)
162 uint32_t cp = 0, state = 0;
165 for (i = 0; *s && i < n; ++s)
166 if (!decode(&state, &cp, *s)) {
168 tot += utf8_chwidth(cp);
175 utf8_swidth(const char *s)
178 uint32_t cp = 0, state = 0;
182 if (!decode(&state, &cp, *s))
183 tot += utf8_chwidth(cp);
189 utf8_swidth_between(const char *str, const char *end)
192 uint32_t cp = 0, state = 0;
195 for (; *str && str < end; ++str)
196 if (!decode(&state, &cp, *str))
197 tot += utf8_chwidth(cp);
202 utf8_next_cp(const char *s)
204 uint32_t cp = 0, state = 0;
207 if (!decode(&state, &cp, *s))
213 utf8_prev_cp(const char *start, const char *base)
217 for (; start > base; start--) {
219 if ((c & 0xC0) != 0x80)
227 * XXX: This is not correct. There are codepoints classified as
228 * "emoji", but these can be joined toghether to form more complex
229 * emoji. There is an ufficial list of what these valid combinations
230 * are, but it would require a costly lookup (a trie can be used to
231 * reduce the times, but...). The following approach is conceptually
232 * simpler: if there is a sequence of "emoji codepoints" (or ZWS) and
233 * then a space, consider everything before the space a single emoji.
234 * It needs a special check for numbers (yes, 0..9 and # are
235 * technically speaking emojis) but otherwise seems to work well in
239 emojied_line(const char *s, const char **space_ret)
241 uint32_t cp = 0, state = 0;
242 int only_numbers = 1;
245 if (!decode(&state, &cp, *s)) {
246 if (cp == ZERO_WIDTH_SPACE)
250 return !only_numbers;
254 if (cp < '0' || cp > '9')