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Amiga Games Extra 1996 September
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Amiga Games Extra CD-ROM 9-1996.iso
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publicdomain
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vim-4.2
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src
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charset.c
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1996-06-09
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/* vi:set ts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
*/
#include "vim.h"
#include "globals.h"
#include "proto.h"
#include "option.h"
/*
* chartab[] is used
* - to quickly recognize ID characters
* - to quickly recognize file name characters
* - to store the size of a character on the screen: Printable is 1 position,
* 2 otherwise
*/
static char_u chartab[256];
static int chartab_initialized = FALSE;
#define CHAR_MASK 0x3 /* low two bits for size */
#define CHAR_ID 0x4 /* third bit set for ID chars */
#define CHAR_IF 0x8 /* fourth bit set for file name chars */
/*
* init_chartab(): Fill chartab[] with flags for ID and file name characters
* and the size of characters on the screen (1 or 2 positions).
* Also fills b_chartab[] with flags for keyword characters for current
* buffer.
*
* Return FAIL if 'iskeyword', 'isident', 'isfname' or 'isprint' option has an
* error, OK otherwise.
*/
int
init_chartab()
{
int c;
int c2;
char_u *p;
int i;
int tilde;
int do_isalpha;
/*
* Set the default size for printable characters:
* From <Space> to '~' is 1 (printable), others are 2 (not printable).
* This also inits all 'isident' and 'isfname' flags to FALSE.
*/
c = 0;
while (c < ' ')
chartab[c++] = 2;
while (c <= '~')
chartab[c++] = 1;
while (c < 256)
chartab[c++] = 2;
/*
* Init word char flags all to FALSE
*/
if (curbuf != NULL)
for (c = 0; c < 256; ++c)
curbuf->b_chartab[c] = FALSE;
/*
* In lisp mode the '-' character is included in keywords.
*/
if (curbuf->b_p_lisp)
curbuf->b_chartab['-'] = TRUE;
/* Walk through the 'isident', 'iskeyword', 'isfname' and 'isprint'
* options Each option is a list of characters, character numbers or
* ranges, separated by commas, e.g.: "200-210,x,#-178,-"
*/
for (i = 0; i < 4; ++i)
{
if (i == 0)
p = p_isi; /* first round: 'isident' */
else if (i == 1)
p = p_isp; /* second round: 'isprint' */
else if (i == 2)
p = p_isf; /* third round: 'isfname' */
else /* i == 3 */
p = curbuf->b_p_isk; /* fourth round: 'iskeyword' */
while (*p)
{
tilde = FALSE;
do_isalpha = FALSE;
if (*p == '^' && p[1] != NUL)
{
tilde = TRUE;
++p;
}
if (isdigit(*p))
c = getdigits(&p);
else
c = *p++;
c2 = -1;
if (*p == '-' && p[1] != NUL)
{
++p;
if (isdigit(*p))
c2 = getdigits(&p);
else
c2 = *p++;
}
if (c < 0 || (c2 < c && c2 != -1) || c2 >= 256 ||
!(*p == NUL || *p == ','))
return FAIL;
if (c2 == -1) /* not a range */
{
/*
* A single '@' (not "@-@"):
* Decide on letters being ID/printable/keyword chars with
* standard function isalpha(). This takes care of locale.
*/
if (c == '@')
{
do_isalpha = TRUE;
c = 1;
c2 = 255;
}
else
c2 = c;
}
while (c <= c2)
{
if (!do_isalpha || isalpha(c))
{
if (i == 0) /* (re)set ID flag */
{
if (tilde)
chartab[c] &= ~CHAR_ID;
else
chartab[c] |= CHAR_ID;
}
else if (i == 1) /* set printable to 1 or 2 */
{
if (c < ' ' || c > '~')
chartab[c] = (chartab[c] & ~CHAR_MASK) +
(tilde ? 2 : 1);
}
else if (i == 2) /* (re)set fname flag */
{
if (tilde)
chartab[c] &= ~CHAR_IF;
else
chartab[c] |= CHAR_IF;
}
else /* i == 3 */ /* (re)set keyword flag */
curbuf->b_chartab[c] = !tilde;
}
++c;
}
p = skip_to_option_part(p);
}
}
chartab_initialized = TRUE;
return OK;
}
/*
* Translate any special characters in buf[bufsize].
* If there is not enough room, not all characters will be translated.
*/
void
trans_characters(buf, bufsize)
char_u *buf;
int bufsize;
{
int len; /* length of string needing translation */
int room; /* room in buffer after string */
char_u *new; /* translated character */
int new_len; /* length of new[] */
len = STRLEN(buf);
room = bufsize - len;
while (*buf)
{
new = transchar(*buf);
new_len = STRLEN(new);
if (new_len > 1)
{
room -= new_len - 1;
if (room <= 0)
return;
vim_memmove(buf + new_len, buf + 1, (size_t)len);
}
vim_memmove(buf, new, (size_t)new_len);
buf += new_len;
--len;
}
}
/*
* Catch 22: chartab[] can't be initialized before the options are
* initialized, and initializing options may cause transchar() to be called!
* When chartab_initialized == FALSE don't use chartab[].
*/
char_u *
transchar(c)
int c;
{
static char_u buf[5];
int i;
i = 0;
if (IS_SPECIAL(c)) /* special key code, display as ~@ char */
{
buf[0] = '~';
buf[1] = '@';
i = 2;
c = K_SECOND(c);
}
if ((!chartab_initialized && c >= ' ' && c <= '~') ||
(chartab[c] & CHAR_MASK) == 1) /* printable character */
{
buf[i] = c;
buf[i + 1] = NUL;
}
else
transchar_nonprint(buf + i, c);
return buf;
}
void
transchar_nonprint(buf, c)
char_u *buf;
int c;
{
if (c <= 0x7f) /* 0x00 - 0x1f and 0x7f */
{
if (c == NL)
c = NUL; /* we use newline in place of a NUL */
buf[0] = '^';
buf[1] = c ^ 0x40; /* DEL displayed as ^? */
buf[2] = NUL;
}
else if (c >= ' ' + 0x80 && c <= '~' + 0x80) /* 0xa0 - 0xfe */
{
buf[0] = '|';
buf[1] = c - 0x80;
buf[2] = NUL;
}
else /* 0x80 - 0x9f and 0xff */
{
buf[0] = '~';
buf[1] = (c - 0x80) ^ 0x40; /* 0xff displayed as ~? */
buf[2] = NUL;
}
}
/*
* return the number of characters 'c' will take on the screen
* This is used very often, keep it fast!!!
*/
int
charsize(c)
register int c;
{
if (IS_SPECIAL(c))
return (chartab[K_SECOND(c)] & CHAR_MASK) + 2;
return (chartab[c] & CHAR_MASK);
}
/*
* Return the number of characters string 's' will take on the screen,
* counting TABs as two characters: "^I".
*/
int
strsize(s)
register char_u *s;
{
register int len = 0;
while (*s)
len += charsize(*s++);
return len;
}
/*
* Return the number of characters 'c' will take on the screen, taking
* into account the size of a tab.
* Use a define to make it fast, this is used very often!!!
* Also see getvcol() below.
*/
#define RET_WIN_BUF_CHARTABSIZE(wp, buf, c, col) \
if ((c) == TAB && !(wp)->w_p_list) \
{ \
register int ts; \
ts = (buf)->b_p_ts; \
return (int)(ts - (col % ts)); \
} \
else \
return charsize(c);
int
chartabsize(c, col)
register int c;
colnr_t col;
{
RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, c, col)
}
int
win_chartabsize(wp, c, col)
register WIN *wp;
register int c;
colnr_t col;
{
RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, c, col)
}
/*
* return the number of characters the string 's' will take on the screen,
* taking into account the size of a tab
*/
int
linetabsize(s)
char_u *s;
{
colnr_t col = 0;
while (*s != NUL)
col += lbr_chartabsize(s++, col);
return (int)col;
}
/*
* return TRUE if 'c' is a normal identifier character
* letters and characters from 'isident' option.
*/
int
isidchar(c)
int c;
{
return (c < 0x100 && (chartab[c] & CHAR_ID));
}
/*
* return TRUE if 'c' is a keyword character: Letters and characters from
* 'iskeyword' option for current buffer.
*/
int
iswordchar(c)
int c;
{
return (c < 0x100 && curbuf->b_chartab[c]);
}
/*
* return TRUE if 'c' is a valid file-name character
*/
int
isfilechar(c)
int c;
{
return (c < 0x100 && (chartab[c] & CHAR_IF));
}
/*
* return TRUE if 'c' is a printable character
*/
int
isprintchar(c)
int c;
{
return (c < 0x100 && (chartab[c] & CHAR_MASK) == 1);
}
/*
* like chartabsize(), but also check for line breaks on the screen
*/
int
lbr_chartabsize(s, col)
unsigned char *s;
colnr_t col;
{
if (!curwin->w_p_lbr && *p_sbr == NUL)
RET_WIN_BUF_CHARTABSIZE(curwin, curbuf, *s, col)
return win_lbr_chartabsize(curwin, s, col, NULL);
}
/*
* This function is used very often, keep it fast!!!!
* Warning: *head is only set if it's a non-zero value, init to 0 before
* calling.
*/
int
win_lbr_chartabsize(wp, s, col, head)
WIN *wp;
unsigned char *s;
colnr_t col;
int *head;
{
int c = *s;
int size;
colnr_t col2;
colnr_t colmax;
int added;
int numberextra;
/*
* No 'linebreak' and 'showbreak': return quickly.
*/
if (!wp->w_p_lbr && *p_sbr == NUL)
RET_WIN_BUF_CHARTABSIZE(wp, wp->w_buffer, c, col)
/*
* First get normal size, without 'linebreak'
*/
size = win_chartabsize(wp, c, col);
/*
* If 'linebreak' set check at a blank before a non-blank if the line needs a
* break here
*/
if (wp->w_p_lbr && isbreak(c) && !isbreak(s[1]) &&
!wp->w_p_list && wp->w_p_wrap)
{
numberextra = curwin->w_p_nu? 8: 0;
/* count all characters from first non-blank after a blank up to next
* non-blank after a blank */
col2 = col;
colmax = (((col + numberextra) / Columns) + 1) * Columns;
while ((c = *++s) != NUL && (isbreak(c) ||
(!isbreak(c) && (col2 == col || !isbreak(s[-1])))))
{
col2 += win_chartabsize(wp, c, col2);
if (col2 + numberextra >= colmax) /* doesn't fit */
{
size = Columns - ((col + numberextra) % Columns);
break;
}
}
}
/*
* May have to add something for 'showbreak' string at start of line
* Set *head to the size of what we add.
*/
added = 0;
if (*p_sbr != NUL && wp->w_p_wrap && col)
{
numberextra = curwin->w_p_nu? 8: 0;
col = (col + numberextra) % Columns;
if (col == 0 || col + size > (colnr_t)Columns)
{
added = STRLEN(p_sbr);
size += added;
if (col != 0)
added = 0;
}
}
if (head != NULL)
*head = added;
return size;
}
/*
* get virtual column number of pos
* start: on the first position of this character (TAB, ctrl)
* cursor: where the cursor is on this character (first char, except for TAB)
* end: on the last position of this character (TAB, ctrl)
*/
void
getvcol(wp, pos, start, cursor, end)
WIN *wp;
FPOS *pos;
colnr_t *start;
colnr_t *cursor;
colnr_t *end;
{
int col;
colnr_t vcol;
char_u *ptr;
int incr;
int head;
int ts = wp->w_buffer->b_p_ts;
int c;
vcol = 0;
ptr = ml_get_buf(wp->w_buffer, pos->lnum, FALSE);
/*
* This function is used very often, do some speed optimizations.
* When 'list', 'linebreak' and 'showbreak' are not set use a simple loop.
*/
if (!wp->w_p_list && !wp->w_p_lbr && *p_sbr == NUL)
{
head = 0;
for (col = pos->col; ; --col, ++ptr)
{
c = *ptr;
/* make sure we don't go past the end of the line */
if (c == NUL)
{
incr = 1; /* NUL at end of line only takes one column */
break;
}
/* A tab gets expanded, depending on the current column */
if (c == TAB)
incr = ts - (vcol % ts);
else
incr = charsize(c);
if (col == 0) /* character at pos.col */
break;
vcol += incr;
}
}
else
{
for (col = pos->col; ; --col, ++ptr)
{
/* A tab gets expanded, depending on the current column */
head = 0;
incr = win_lbr_chartabsize(wp, ptr, vcol, &head);
/* make sure we don't go past the end of the line */
if (*ptr == NUL)
{
incr = 1; /* NUL at end of line only takes one column */
break;
}
if (col == 0) /* character at pos.col */
break;
vcol += incr;
}
}
if (start != NULL)
*start = vcol + head;
if (end != NULL)
*end = vcol + incr - 1;
if (cursor != NULL)
{
if (*ptr == TAB && (State & NORMAL) && !wp->w_p_list)
*cursor = vcol + incr - 1; /* cursor at end */
else
*cursor = vcol + head; /* cursor at start */
}
}