@@ -1,204 +1,8 @@
1−/*
2− * This is an implementation of wcwidth() and wcswidth() (defined in
3− * IEEE Std 1002.1-2001) for Unicode.
4− *
5− * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
6− * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
7− *
8− * In fixed-width output devices, Latin characters all occupy a single
9− * "cell" position of equal width, whereas ideographic CJK characters
10− * occupy two such cells. Interoperability between terminal-line
11− * applications and (teletype-style) character terminals using the
12− * UTF-8 encoding requires agreement on which character should advance
13− * the cursor by how many cell positions. No established formal
14− * standards exist at present on which Unicode character shall occupy
15− * how many cell positions on character terminals. These routines are
16− * a first attempt of defining such behavior based on simple rules
17− * applied to data provided by the Unicode Consortium.
18− *
19− * For some graphical characters, the Unicode standard explicitly
20− * defines a character-cell width via the definition of the East Asian
21− * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
22− * In all these cases, there is no ambiguity about which width a
23− * terminal shall use. For characters in the East Asian Ambiguous (A)
24− * class, the width choice depends purely on a preference of backward
25− * compatibility with either historic CJK or Western practice.
26− * Choosing single-width for these characters is easy to justify as
27− * the appropriate long-term solution, as the CJK practice of
28− * displaying these characters as double-width comes from historic
29− * implementation simplicity (8-bit encoded characters were displayed
30− * single-width and 16-bit ones double-width, even for Greek,
31− * Cyrillic, etc.) and not any typographic considerations.
32− *
33− * Much less clear is the choice of width for the Not East Asian
34− * (Neutral) class. Existing practice does not dictate a width for any
35− * of these characters. It would nevertheless make sense
36− * typographically to allocate two character cells to characters such
37− * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
38− * represented adequately with a single-width glyph. The following
39− * routines at present merely assign a single-cell width to all
40− * neutral characters, in the interest of simplicity. This is not
41− * entirely satisfactory and should be reconsidered before
42− * establishing a formal standard in this area. At the moment, the
43− * decision which Not East Asian (Neutral) characters should be
44− * represented by double-width glyphs cannot yet be answered by
45− * applying a simple rule from the Unicode database content. Setting
46− * up a proper standard for the behavior of UTF-8 character terminals
47− * will require a careful analysis not only of each Unicode character,
48− * but also of each presentation form, something the author of these
49− * routines has avoided to do so far.
50− *
51− * http://www.unicode.org/unicode/reports/tr11/
52− *
53− * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
54− *
55− * Permission to use, copy, modify, and distribute this software
56− * for any purpose and without fee is hereby granted. The author
57− * disclaims all warranties with regard to this software.
58− *
59− * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
60− */
611
622#include <HsFFI.h>
63−
64−struct interval {
65− int first;
66− int last;
67−};
68−
69−/* auxiliary function for binary search in interval table */
70−static int vty_bisearch(HsChar ucs, const struct interval *table, int max) {
71− int min = 0;
72− int mid;
73−
74− if (ucs < table[0].first || ucs > table[max].last)
75− return 0;
76− while (max >= min) {
77− mid = (min + max) / 2;
78− if (ucs > table[mid].last)
79− min = mid + 1;
80− else if (ucs < table[mid].first)
81− max = mid - 1;
82− else
83− return 1;
84− }
85−
86− return 0;
87−}
88−
89−
90−/* The following two functions define the column width of an ISO 10646
91− * character as follows:
92− *
93− * - The null character (U+0000) has a column width of 0.
94− *
95− * - Other C0/C1 control characters and DEL will lead to a return
96− * value of -1.
97− *
98− * - Non-spacing and enclosing combining characters (general
99− * category code Mn or Me in the Unicode database) have a
100− * column width of 0.
101− *
102− * - SOFT HYPHEN (U+00AD) has a column width of 1.
103− *
104− * - Other format characters (general category code Cf in the Unicode
105− * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
106− *
107− * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
108− * have a column width of 0.
109− *
110− * - Spacing characters in the East Asian Wide (W) or East Asian
111− * Full-width (F) category as defined in Unicode Technical
112− * Report #11 have a column width of 2.
113− *
114− * - All remaining characters (including all printable
115− * ISO 8859-1 and WGL4 characters, Unicode control characters,
116− * etc.) have a column width of 1.
117− *
118− * This implementation assumes that wchar_t characters are encoded
119− * in ISO 10646.
120− */
3+#include <utf8proc.h>
1214
1225HsInt vty_mk_wcwidth(HsChar ucs)
1236{
124− /* sorted list of non-overlapping intervals of non-spacing characters */
125− /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
126− static const struct interval combining[] = {
127− { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
128− { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
129− { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
130− { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
131− { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
132− { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
133− { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
134− { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
135− { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
136− { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
137− { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
138− { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
139− { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
140− { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
141− { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
142− { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
143− { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
144− { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
145− { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
146− { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
147− { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
148− { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
149− { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
150− { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
151− { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
152− { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
153− { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
154− { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
155− { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
156− { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
157− { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
158− { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
159− { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
160− { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
161− { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
162− { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
163− { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
164− { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
165− { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
166− { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
167− { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
168− { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
169− { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
170− { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
171− { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
172− { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
173− { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
174− { 0xE0100, 0xE01EF }
175− };
176−
177− /* test for 8-bit control characters */
178− if (ucs == 0)
179− return 0;
180− if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
181− return -1;
182−
183− /* binary search in table of non-spacing characters */
184− if (vty_bisearch(ucs, combining,
185− sizeof(combining) / sizeof(struct interval) - 1))
186− return 0;
187−
188− /* if we arrive here, ucs is not a combining or C0/C1 control character */
189−
190− return 1 +
191− (ucs >= 0x1100 &&
192− (ucs <= 0x115f || /* Hangul Jamo init. consonants */
193− ucs == 0x2329 || ucs == 0x232a ||
194− (ucs >= 0x2e80 && ucs <= 0xa4cf &&
195− ucs != 0x303f) || /* CJK ... Yi */
196− (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
197− (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
198− (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
199− (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
200− (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
201− (ucs >= 0xffe0 && ucs <= 0xffe6) ||
202− (ucs >= 0x20000 && ucs <= 0x2fffd) ||
203− (ucs >= 0x30000 && ucs <= 0x3fffd)));
7+ return (HsInt) utf8proc_charwidth((utf8proc_int32_t) ucs);
2048}