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utf8.c: use a table for double_width

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Refactor git_wcwidth() and replace the if-else-if chain.
Use the table double_width which is scanned by the bisearch() function,
which is already used to find combining code points.

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Torsten Bögershausen 2014-05-09 23:51:38 +02:00 committed by Junio C Hamano
parent d813ab970d
commit 08460345b5
1 changed files with 18 additions and 23 deletions
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41
utf8.c
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@ -126,6 +126,19 @@ static int git_wcwidth(ucs_char_t ch)
{ 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 },
{ 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF }
};
static const struct interval double_width[] = {
{ 0x1100, 0x115F },
{ 0x2329, 0x232A },
{ 0x2E80, 0x303E },
{ 0x3040, 0xA4CF },
{ 0xAC00, 0xD7A3 },
{ 0xF900, 0xFAFF },
{ 0xFE30, 0xFE6F },
{ 0xFF00, 0xFF60 },
{ 0xFFE0, 0xFFE6 },
{ 0x20000, 0x2FFFD },
{ 0x30000, 0x3FFFD }
};
/* test for 8-bit control characters */
if (ch == 0)
@ -138,30 +151,12 @@ static int git_wcwidth(ucs_char_t ch)
/ sizeof(struct interval) - 1))
return 0;
/*
* If we arrive here, ch is neither a combining nor a C0/C1
* control character.
*/
/* binary search in table of double width characters */
if (bisearch(ch, double_width, sizeof(double_width)
/ sizeof(struct interval) - 1))
return 2;
return 1 +
(ch >= 0x1100 &&
/* Hangul Jamo init. consonants */
(ch <= 0x115f ||
ch == 0x2329 || ch == 0x232a ||
/* CJK ... Yi */
(ch >= 0x2e80 && ch <= 0xa4cf &&
ch != 0x303f) ||
/* Hangul Syllables */
(ch >= 0xac00 && ch <= 0xd7a3) ||
/* CJK Compatibility Ideographs */
(ch >= 0xf900 && ch <= 0xfaff) ||
/* CJK Compatibility Forms */
(ch >= 0xfe30 && ch <= 0xfe6f) ||
/* Fullwidth Forms */
(ch >= 0xff00 && ch <= 0xff60) ||
(ch >= 0xffe0 && ch <= 0xffe6) ||
(ch >= 0x20000 && ch <= 0x2fffd) ||
(ch >= 0x30000 && ch <= 0x3fffd)));
return 1;
}
/*