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doc [ci skip] #10129

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- document lua vim.loop #10123
This commit is contained in:
Justin M. Keyes
2019-06-10 15:53:42 +02:00
committed by GitHub
parent c83926cd0a
commit 04e2ba85b1
5 changed files with 106 additions and 45 deletions
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49
src/nvim/mbyte.c
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@@ -456,43 +456,50 @@ static bool intable(const struct interval *table, size_t n_items, int c)
return false;
}
/*
* For UTF-8 character "c" return 2 for a double-width character, 1 for others.
* Returns 4 or 6 for an unprintable character.
* Is only correct for characters >= 0x80.
* When p_ambw is "double", return 2 for a character with East Asian Width
* class 'A'(mbiguous).
*/
/// For UTF-8 character "c" return 2 for a double-width character, 1 for others.
/// Returns 4 or 6 for an unprintable character.
/// Is only correct for characters >= 0x80.
/// When p_ambw is "double", return 2 for a character with East Asian Width
/// class 'A'(mbiguous).
///
/// @note Tables `doublewidth` and `ambiguous` are generated by
/// gen_unicode_tables.lua, which must be manually invoked as needed.
int utf_char2cells(int c)
{
if (c >= 0x100) {
#ifdef USE_WCHAR_FUNCTIONS
/*
* Assume the library function wcwidth() works better than our own
* stuff. It should return 1 for ambiguous width chars!
*/
//
// Assume the library function wcwidth() works better than our own
// stuff. It should return 1 for ambiguous width chars!
//
int n = wcwidth(c);
if (n < 0)
return 6; /* unprintable, displays <xxxx> */
if (n > 1)
if (n < 0) {
return 6; // unprintable, displays <xxxx>
}
if (n > 1) {
return n;
}
#else
if (!utf_printable(c))
return 6; /* unprintable, displays <xxxx> */
if (intable(doublewidth, ARRAY_SIZE(doublewidth), c))
if (!utf_printable(c)) {
return 6; // unprintable, displays <xxxx>
}
if (intable(doublewidth, ARRAY_SIZE(doublewidth), c)) {
return 2;
}
#endif
if (p_emoji && intable(emoji_width, ARRAY_SIZE(emoji_width), c)) {
return 2;
}
} else if (c >= 0x80 && !vim_isprintc(c)) {
// Characters below 0x100 are influenced by 'isprint' option.
return 4; // unprintable, displays <xx>
}
/* Characters below 0x100 are influenced by 'isprint' option */
else if (c >= 0x80 && !vim_isprintc(c))
return 4; /* unprintable, displays <xx> */
if (c >= 0x80 && *p_ambw == 'd' && intable(ambiguous, ARRAY_SIZE(ambiguous), c))
if (c >= 0x80 && *p_ambw == 'd'
&& intable(ambiguous, ARRAY_SIZE(ambiguous), c)) {
return 2;
}
return 1;
}