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unicode: optional table for better handling of neutral bidi chars

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Off:
function                                             old     new   delta
unicode_bidi_isrtl                                     -      55     +55
isrtl_str                                             51      65     +14
unicode_isrtl                                         55       -     -55
read_line_input                                     5003    4937     -66
------------------------------------------------------------------------------
(add/remove: 1/4 grow/shrink: 1/1 up/down: 69/-121)           Total: -52 bytes

On:
function                                             old     new   delta
static.neutral_b                                       -     320    +320
static.neutral_p                                       -     142    +142
unicode_bidi_isrtl                                     -      55     +55
unicode_bidi_is_neutral_wchar                          -      55     +55
isrtl_str                                             51      59      +8
unicode_isrtl                                         55       -     -55
read_line_input                                     5003    4937     -66
------------------------------------------------------------------------------
(add/remove: 4/4 grow/shrink: 1/1 up/down: 580/-121)          Total: 459 bytes

Signed-off-by: Tomas Heinrich <heinrich.tomas@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Tomas Heinrich
2010-03-26 13:13:24 +01:00
committed by Denys Vlasenko
parent 385b4562e3
commit aa167556cd
5 changed files with 284 additions and 106 deletions
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14
libbb/lineedit.c
View File

@ -1742,9 +1742,10 @@ static int lineedit_read_key(char *read_key_buffer)
static int isrtl_str(void)
{
int idx = cursor;
while (command_ps[idx] >= ' ' && command_ps[idx] < 127 && !isalpha(command_ps[idx]))
while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
idx++;
return unicode_isrtl(command_ps[idx]);
return unicode_bidi_isrtl(command_ps[idx]);
}
#else
# define isrtl_str() 0
@ -2220,19 +2221,18 @@ int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, li
command_ps[cursor] = ic;
command_ps[cursor + 1] = BB_NUL;
cmdedit_set_out_char(' ');
if (unicode_isrtl(ic))
if (unicode_bidi_isrtl(ic))
input_backward(1);
} else {
/* In the middle, insert */
/* is char right-to-left, or "neutral" one (e.g. comma) added to rtl text? */
int rtl = ENABLE_UNICODE_BIDI_SUPPORT ? (unicode_isrtl(ic) || (ic < 127 && !isalpha(ic) && isrtl_str())) : 0;
int sc = cursor;
memmove(command_ps + sc + 1, command_ps + sc,
(command_len - sc) * sizeof(command_ps[0]));
command_ps[sc] = ic;
if (!rtl)
sc++;
/* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
if (!isrtl_str())
sc++; /* no */
/* rewrite from cursor */
input_end();
/* to prev x pos + 1 */