#include <config.h>
#include "lisp.h"
#include "buffer.h"
+#include "charset.h"
+#include "category.h"
#include "indent.h"
#include "frame.h"
#include "window.h"
/* Value of MODIFF when current_column was called */
int last_known_column_modified;
+static int current_column_1 ();
+
+/* Cache of beginning of line found by the last call of
+ current_column. */
+int current_column_bol_cache;
+
/* Get the display table to use for the current buffer. */
struct Lisp_Char_Table *
static void
width_run_cache_on_off ()
{
- if (NILP (current_buffer->cache_long_line_scans))
+ if (NILP (current_buffer->cache_long_line_scans)
+ /* And, for the moment, this feature doesn't work on multibyte
+ characters. */
+ || !NILP (current_buffer->enable_multibyte_characters))
{
/* It should be off. */
if (current_buffer->width_run_cache)
int to;
Lisp_Object window;
{
- Lisp_Object prop, position, end, overlay_limit, proplimit;
+ Lisp_Object prop, position, overlay_limit, proplimit;
Lisp_Object buffer;
+ int end;
XSETFASTINT (position, pos);
XSETBUFFER (buffer, current_buffer);
/* No matter what. don't go past next overlay change. */
if (XFASTINT (overlay_limit) < XFASTINT (proplimit))
proplimit = overlay_limit;
- end = Fnext_single_property_change (position, Qinvisible,
- buffer, proplimit);
- *next_boundary_p = XFASTINT (end);
+ end = XFASTINT (Fnext_single_property_change (position, Qinvisible,
+ buffer, proplimit));
+ /* Don't put the boundary in the middle of multibyte form if
+ there is no actual property change. */
+ if (end == pos + 100
+ && !NILP (current_buffer->enable_multibyte_characters)
+ && end < ZV)
+ while (pos < end && !CHAR_HEAD_P (POS_ADDR (end)))
+ end--;
+ *next_boundary_p = end;
}
/* if the `invisible' property is set, we can skip to
the next property change */
/* Cancel any recorded value of the horizontal position. */
+void
invalidate_current_column ()
{
last_known_column_point = 0;
register struct Lisp_Char_Table *dp = buffer_display_table ();
int stopchar;
- if (point == last_known_column_point
+ if (PT == last_known_column_point
&& MODIFF == last_known_column_modified)
return last_known_column;
- /* If the buffer has overlays or text properties,
+ /* If the buffer has overlays, text properties, or multibyte,
use a more general algorithm. */
if (BUF_INTERVALS (current_buffer)
|| !NILP (current_buffer->overlays_before)
- || !NILP (current_buffer->overlays_after))
- return current_column_1 (point);
+ || !NILP (current_buffer->overlays_after)
+ || !NILP (current_buffer->enable_multibyte_characters))
+ return current_column_1 (PT);
/* Scan backwards from point to the previous newline,
counting width. Tab characters are the only complicated case. */
/* Make a pointer for decrementing through the chars before point. */
- ptr = &FETCH_CHAR (point - 1) + 1;
+ ptr = POS_ADDR (PT - 1) + 1;
/* Make a pointer to where consecutive chars leave off,
going backwards from point. */
- if (point == BEGV)
+ if (PT == BEGV)
stop = ptr;
- else if (point <= GPT || BEGV > GPT)
+ else if (PT <= GPT || BEGV > GPT)
stop = BEGV_ADDR;
else
stop = GAP_END_ADDR;
col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
else if (c >= 040 && c < 0177)
col++;
- else if (c == '\n')
- break;
- else if (c == '\r' && EQ (current_buffer->selective_display, Qt))
- break;
+ else if (c == '\n'
+ || (c == '\r' && EQ (current_buffer->selective_display, Qt)))
+ {
+ ptr++;
+ break;
+ }
else if (c == '\t')
{
if (tab_seen)
col += post_tab;
}
+ if (ptr == BEGV_ADDR)
+ current_column_bol_cache = BEGV;
+ else
+ current_column_bol_cache = PTR_CHAR_POS (ptr);
last_known_column = col;
- last_known_column_point = point;
+ last_known_column_point = PT;
last_known_column_modified = MODIFF;
return col;
/* Start the scan at the beginning of this line with column number 0. */
register int col = 0;
- int scan = find_next_newline (pos, -1);
+ int scan = current_column_bol_cache = find_next_newline (pos, -1);
int next_boundary = scan;
+ int multibyte = !NILP (current_buffer->enable_multibyte_characters);
if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
goto endloop;
}
- c = FETCH_CHAR (scan);
+ c = FETCH_BYTE (scan);
if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
{
col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
col += tab_width;
col = col / tab_width * tab_width;
}
+ else if (multibyte && BASE_LEADING_CODE_P (c))
+ {
+ scan--;
+ /* Start of multi-byte form. */
+ if (c == LEADING_CODE_COMPOSITION)
+ {
+ unsigned char *ptr = POS_ADDR (scan);
+
+ int cmpchar_id = str_cmpchar_id (ptr, next_boundary - scan);
+ if (cmpchar_id >= 0)
+ {
+ scan += cmpchar_table[cmpchar_id]->len,
+ col += cmpchar_table[cmpchar_id]->width;
+ }
+ else
+ { /* invalid composite character */
+ scan++;
+ col += 4;
+ }
+ }
+ else
+ {
+ /* Here, we check that the following bytes are valid
+ constituents of multi-byte form. */
+ int len = BYTES_BY_CHAR_HEAD (c), i;
+
+ for (i = 1, scan++; i < len; i++, scan++)
+ /* We don't need range checking for PTR because there
+ are anchors (`\0') at GAP and Z. */
+ if (CHAR_HEAD_P (POS_ADDR (scan))) break;
+ if (i < len)
+ col += 4, scan -= i - 1;
+ else
+ col += WIDTH_BY_CHAR_HEAD (c);
+ }
+ }
else if (ctl_arrow && (c < 040 || c == 0177))
col += 2;
else if (c < 040 || c >= 0177)
endloop:
last_known_column = col;
- last_known_column_point = point;
+ last_known_column_point = PT;
last_known_column_modified = MODIFF;
return col;
Finsert_char (make_number (' '), column, Qt);
last_known_column = mincol;
- last_known_column_point = point;
+ last_known_column_point = PT;
last_known_column_modified = MODIFF;
XSETINT (column, mincol);
{
Lisp_Object val;
- XSETFASTINT (val, position_indentation (find_next_newline (point, -1)));
+ XSETFASTINT (val, position_indentation (find_next_newline (PT, -1)));
return val;
}
if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
- p = &FETCH_CHAR (pos);
+ p = POS_ADDR (pos);
/* STOP records the value of P at which we will need
to think about the gap, or about invisible text,
or about the end of the buffer. */
(if STOP_POS is the position of the gap)
rather than at the data after the gap. */
- stop = &FETCH_CHAR (stop_pos - 1) + 1;
- p = &FETCH_CHAR (pos);
+ stop = POS_ADDR (stop_pos - 1) + 1;
+ p = POS_ADDR (pos);
}
switch (*p++)
{
+ case 0240:
+ if (! NILP (current_buffer->enable_multibyte_characters))
+ return column;
case ' ':
column++;
break;
column += tab_width - column % tab_width;
break;
default:
- return column;
+ if (ASCII_BYTE_P (p[-1])
+ || NILP (current_buffer->enable_multibyte_characters))
+ return column;
+ {
+ int pos = PTR_CHAR_POS (p - 1);
+ int c = FETCH_MULTIBYTE_CHAR (pos);
+ if (CHAR_HAS_CATEGORY (c, ' '))
+ {
+ column++;
+ INC_POS (pos);
+ p = POS_ADDR (pos);
+ }
+ else
+ return column;
+ }
}
}
}
indented_beyond_p (pos, column)
int pos, column;
{
- while (pos > BEGV && FETCH_CHAR (pos) == '\n')
+ while (pos > BEGV && FETCH_BYTE (pos) == '\n')
pos = find_next_newline_no_quit (pos - 1, -1);
return (position_indentation (pos) >= column);
}
register int tab_width = XINT (current_buffer->tab_width);
register int ctl_arrow = !NILP (current_buffer->ctl_arrow);
register struct Lisp_Char_Table *dp = buffer_display_table ();
+ register int multibyte = !NILP (current_buffer->enable_multibyte_characters);
Lisp_Object val;
int prev_col;
CHECK_NATNUM (column, 0);
goal = XINT (column);
- pos = point;
+ pos = PT;
end = ZV;
next_boundary = pos;
if (col > goal)
{
end = pos;
- pos = find_next_newline (pos, -1);
+ pos = current_column_bol_cache;
col = 0;
}
- while (col < goal && pos < end)
+ while (pos < end)
{
while (pos == next_boundary)
{
goto endloop;
}
- c = FETCH_CHAR (pos);
+ /* Test reaching the goal column. We do this after skipping
+ invisible characters, so that we put point before the
+ character on which the cursor will appear. */
+ if (col >= goal)
+ break;
+
+ c = FETCH_BYTE (pos);
if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
{
col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
}
else if (ctl_arrow && (c < 040 || c == 0177))
col += 2;
- else if (c < 040 || c >= 0177)
+ else if (c < 040 || c == 0177)
col += 4;
- else
+ else if (c < 0177)
col++;
+ else if (multibyte && BASE_LEADING_CODE_P (c))
+ {
+ /* Start of multi-byte form. */
+ unsigned char *ptr;
+
+ pos--; /* rewind to the character head */
+ ptr = POS_ADDR (pos);
+ if (c == LEADING_CODE_COMPOSITION)
+ {
+ int cmpchar_id = str_cmpchar_id (ptr, end - pos);
+
+ if (cmpchar_id >= 0)
+ {
+ col += cmpchar_table[cmpchar_id]->width;
+ pos += cmpchar_table[cmpchar_id]->len;
+ }
+ else
+ { /* invalid composite character */
+ col += 4;
+ pos++;
+ }
+ }
+ else
+ {
+ /* Here, we check that the following bytes are valid
+ constituents of multi-byte form. */
+ int len = BYTES_BY_CHAR_HEAD (c), i;
+
+ for (i = 1, ptr++; i < len; i++, ptr++)
+ /* We don't need range checking for PTR because there
+ are anchors (`\0') both at GPT and Z. */
+ if (CHAR_HEAD_P (ptr)) break;
+ if (i < len)
+ col += 4, pos++;
+ else
+ col += WIDTH_BY_CHAR_HEAD (c), pos += i;
+ }
+ }
+ else
+ col += 4;
}
endloop:
{
int old_point;
- del_range (point - 1, point);
+ del_range (PT - 1, PT);
Findent_to (make_number (goal), Qnil);
- old_point = point;
+ old_point = PT;
Findent_to (make_number (col), Qnil);
SET_PT (old_point);
/* Set the last_known... vars consistently. */
Findent_to (make_number (col = goal), Qnil);
last_known_column = col;
- last_known_column_point = point;
+ last_known_column_point = PT;
last_known_column_modified = MODIFF;
XSETFASTINT (val, col);
into account. That is, beginning-of-line moves you to the hpos
-HSCROLL + (HSCROLL > 0).
- Note that FROMHPOS and TOHPOS should be expressed in real screen
- columns, taking HSCROLL and the truncation glyph at the left margin
- into account. That is, beginning-of-line moves you to the hpos
- -HSCROLL + (HSCROLL > 0).
-
For example, to find the buffer position of column COL of line LINE
of a certain window, pass the window's starting location as FROM
and the window's upper-left coordinates as FROMVPOS and FROMHPOS.
= (INTEGERP (current_buffer->selective_display)
? XINT (current_buffer->selective_display)
: !NILP (current_buffer->selective_display) ? -1 : 0);
- int prev_vpos = vpos, prev_hpos = 0;
+ int prev_hpos = 0;
int selective_rlen
= (selective && dp && VECTORP (DISP_INVIS_VECTOR (dp))
? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0);
int next_width_run = from;
Lisp_Object window;
+ int multibyte = !NILP (current_buffer->enable_multibyte_characters);
+ int wide_column = 0; /* Set to 1 when a previous character
+ is wide-colomn. */
+ int prev_pos; /* Previous buffer position. */
+ int contin_hpos; /* HPOS of last column of continued line. */
+ int prev_tab_offset; /* Previous tab offset. */
+
XSETBUFFER (buffer, current_buffer);
XSETWINDOW (window, win);
if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
- pos = from;
+ pos = prev_pos = from;
+ contin_hpos = 0;
+ prev_tab_offset = tab_offset;
while (1)
{
while (pos == next_boundary)
{
+ int newpos;
+
/* If the caller says that the screen position came from an earlier
call to compute_motion, then we've already accounted for the
overlay strings at point. This is only true the first time
through, so clear the flag after testing it. */
if (!did_motion)
/* We need to skip past the overlay strings. Currently those
- strings must contain single-column printing characters;
+ strings must not contain TAB;
if we want to relax that restriction, something will have
to be changed here. */
- hpos += overlay_strings (pos, win, (char **)0);
+ {
+ unsigned char *ovstr;
+ int ovlen = overlay_strings (pos, win, &ovstr);
+ hpos += (multibyte ? strwidth (ovstr, ovlen) : ovlen);
+ }
did_motion = 0;
if (pos >= to)
(but not necessarily all that there are here),
and store in next_boundary the next position where
we need to call skip_invisible. */
- pos = skip_invisible (pos, &next_boundary, to, window);
+ newpos = skip_invisible (pos, &next_boundary, to, window);
+
+ if (newpos >= to)
+ goto after_loop;
+
+ pos = newpos;
}
/* Handle right margin. */
- if (hpos >= width
- && (hpos > width
- || (pos < ZV && FETCH_CHAR (pos) != '\n')))
+ /* Note on a wide-column character.
+
+ Characters are classified into the following three categories
+ according to the width (columns occupied on screen).
+
+ (1) single-column character: ex. `a'
+ (2) multi-column character: ex. `^A', TAB, `\033'
+ (3) wide-column character: ex. Japanese character, Chinese character
+ (In the following example, `W_' stands for them.)
+
+ Multi-column characters can be divided around the right margin,
+ but wide-column characters cannot.
+
+ NOTE:
+
+ (*) The cursor is placed on the next character after the point.
+
+ ----------
+ abcdefghi\
+ j ^---- next after the point
+ ^--- next char. after the point.
+ ----------
+ In case of sigle-column character
+
+ ----------
+ abcdefgh\\
+ 033 ^---- next after the point, next char. after the point.
+ ----------
+ In case of multi-column character
+
+ ----------
+ abcdefgh\\
+ W_ ^---- next after the point
+ ^---- next char. after the point.
+ ----------
+ In case of wide-column character
+
+ The problem here is continuation at a wide-column character.
+ In this case, the line may shorter less than WIDTH.
+ And we find the continuation AFTER it occurs.
+
+ */
+
+ if (hpos > width)
{
if (hscroll
|| (truncate_partial_width_windows
|| !NILP (current_buffer->truncate_lines))
{
/* Truncating: skip to newline. */
- pos = find_before_next_newline (pos, to, 1);
+ if (pos <= to) /* This IF is needed because we may past TO */
+ pos = find_before_next_newline (pos, to, 1);
hpos = width;
/* If we just skipped next_boundary,
loop around in the main while
and handle it. */
if (pos >= next_boundary)
next_boundary = pos + 1;
+ prev_hpos = width;
+ prev_tab_offset = tab_offset;
}
else
{
/* Continuing. */
- vpos += hpos / width;
- tab_offset += hpos - hpos % width;
- hpos %= width;
+ /* Remember the previous value. */
+ prev_tab_offset = tab_offset;
+
+ if (wide_column)
+ {
+ hpos -= prev_hpos;
+ tab_offset += prev_hpos;
+ }
+ else
+ {
+ tab_offset += width;
+ hpos -= width;
+ }
+ vpos++;
+ contin_hpos = prev_hpos;
+ prev_hpos = 0;
}
}
/* Stop if past the target buffer position or screen position. */
- if (pos >= to)
- break;
- if (vpos > tovpos || (vpos == tovpos && hpos >= tohpos))
+ if (pos > to)
+ {
+ /* Go back to the previous position. */
+ pos = prev_pos;
+ hpos = prev_hpos;
+ tab_offset = prev_tab_offset;
+
+ /* NOTE on contin_hpos, hpos, and prev_hpos.
+
+ ----------
+ abcdefgh\\
+ W_ ^---- contin_hpos
+ | ^----- hpos
+ \---- prev_hpos
+ ----------
+ */
+
+ if (contin_hpos && prev_hpos == 0
+ && contin_hpos < width && !wide_column)
+ {
+ /* Line breaking occurs in the middle of multi-column
+ character. Go back to previous line. */
+ hpos = contin_hpos;
+ vpos = vpos - 1;
+ }
+ else if (c == '\n')
+ /* If previous character is NEWLINE,
+ set VPOS back to previous line */
+ vpos = vpos - 1;
+ break;
+ }
+
+ if (vpos > tovpos || vpos == tovpos && hpos >= tohpos)
+ {
+ if (contin_hpos && prev_hpos == 0
+ && ((hpos > tohpos && contin_hpos == width) || wide_column))
+ { /* Line breaks because we can't put the character at the
+ previous line any more. It is not the multi-column
+ character continued in middle. Go back to previous
+ buffer position, screen position, and set tab offset
+ to previous value. It's the beginning of the
+ line. */
+ pos = prev_pos;
+ hpos = prev_hpos;
+ tab_offset = prev_tab_offset;
+ }
+ break;
+ }
+ if (pos == ZV) /* We cannot go beyond ZV. Stop here. */
break;
- prev_vpos = vpos;
prev_hpos = hpos;
+ prev_pos = pos;
+ wide_column = 0;
/* Consult the width run cache to see if we can avoid inspecting
the text character-by-character. */
/* We have to scan the text character-by-character. */
else
{
- c = FETCH_CHAR (pos);
+ c = FETCH_BYTE (pos);
pos++;
/* Perhaps add some info to the width_run_cache. */
/* Is this character part of the current run? If so, extend
the run. */
if (pos - 1 == width_run_end
- && width_table[c] == width_run_width)
+ && XFASTINT (width_table[c]) == width_run_width)
width_run_end = pos;
/* The previous run is over, since this is a character at a
width_run_start, width_run_end);
/* Start recording a new width run. */
- width_run_width = width_table[c];
+ width_run_width = XFASTINT (width_table[c]);
width_run_start = pos - 1;
width_run_end = pos;
}
}
- if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))
+ && ! (multibyte && BASE_LEADING_CODE_P (c)))
hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
else if (c >= 040 && c < 0177)
hpos++;
{
if (selective > 0 && indented_beyond_p (pos, selective))
{
- /* Skip any number of invisible lines all at once */
- do
- pos = find_before_next_newline (pos, to, 1) + 1;
- while (pos < to
- && indented_beyond_p (pos, selective));
- /* Allow for the " ..." that is displayed for them. */
- if (selective_rlen)
+ /* If (pos == to), we don't have to take care of
+ selective display. */
+ if (pos < to)
{
- hpos += selective_rlen;
- if (hpos >= width)
- hpos = width;
+ /* Skip any number of invisible lines all at once */
+ do
+ pos = find_before_next_newline (pos, to, 1) + 1;
+ while (pos < to
+ && indented_beyond_p (pos, selective));
+ /* Allow for the " ..." that is displayed for them. */
+ if (selective_rlen)
+ {
+ hpos += selective_rlen;
+ if (hpos >= width)
+ hpos = width;
+ }
+ --pos;
+ /* We have skipped the invis text, but not the
+ newline after. */
}
- --pos;
- /* We have skipped the invis text, but not the
- newline after. */
}
else
{
hpos++;
tab_offset = 0;
}
+ contin_hpos = 0;
}
else if (c == CR && selective < 0)
{
/* In selective display mode,
everything from a ^M to the end of the line is invisible.
Stop *before* the real newline. */
- pos = find_before_next_newline (pos, to, 1);
+ if (pos < to)
+ pos = find_before_next_newline (pos, to, 1);
/* If we just skipped next_boundary,
loop around in the main while
and handle it. */
hpos = width;
}
}
+ else if (multibyte && BASE_LEADING_CODE_P (c))
+ {
+ /* Start of multi-byte form. */
+ unsigned char *ptr;
+ int len, actual_len;
+
+ pos--; /* rewind POS */
+
+ ptr = (((pos) >= GPT ? GAP_SIZE : 0) + (pos) + BEG_ADDR - 1);
+ len = ((pos) >= GPT ? ZV : GPT) - (pos);
+
+ c = STRING_CHAR_AND_LENGTH (ptr, len, actual_len);
+
+ if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
+ else if (actual_len == 1)
+ hpos += 4;
+ else if (COMPOSITE_CHAR_P (c))
+ {
+ int id = COMPOSITE_CHAR_ID (c);
+ int width = (id < n_cmpchars) ? cmpchar_table[id]->width : 0;
+ hpos += width;
+ if (width > 1)
+ wide_column = 1;
+ }
+ else
+ {
+ int width = WIDTH_BY_CHAR_HEAD (*ptr);
+ hpos += width;
+ if (width > 1)
+ wide_column = 1;
+ }
+
+ pos += actual_len;
+ }
else
hpos += (ctl_arrow && c < 0200) ? 2 : 4;
}
}
+ after_loop:
+
/* Remember any final width run in the cache. */
if (current_buffer->width_run_cache
&& width_run_width == 1
val_compute_motion.hpos = hpos;
val_compute_motion.vpos = vpos;
val_compute_motion.prevhpos = prev_hpos;
+ /* We alalways handle all of them here; none of them remain to do. */
+ val_compute_motion.ovstring_chars_done = 0;
/* Nonzero if have just continued a line */
- val_compute_motion.contin
- = (pos != from
- && (val_compute_motion.vpos != prev_vpos)
- && c != '\n');
+ val_compute_motion.contin = (contin_hpos && prev_hpos == 0);
return &val_compute_motion;
}
int col;
int width = window_internal_width (w) - 1;
- if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n')
+ if (pos == BEGV)
+ return MINI_WINDOW_P (w) ? -minibuf_prompt_width : 0;
+ if (FETCH_BYTE (pos - 1) == '\n')
return 0;
TEMP_SET_PT (pos);
col = current_column ();
TEMP_SET_PT (opoint);
+ /* Modulo is no longer valid, as a line may get shorter than WIDTH
+ columns by continuation of a wide-column character. Just return
+ COL here. */
+#if 0
+ /* In the continuation of the first line in a minibuffer we must
+ take the width of the prompt into account. */
+ if (MINI_WINDOW_P (w) && col >= width - minibuf_prompt_width
+ && find_next_newline_no_quit (pos, -1) == BEGV)
+ return col - (col + minibuf_prompt_width) % width;
return col - (col % width);
+#endif
+ return col;
}
\f
lmargin + (XFASTINT (prevline) == BEG
? start_hpos : 0),
0,
- from, 1 << (BITS_PER_INT - 2), 0,
- width, hscroll, 0, w);
+ from,
+ /* Don't care for VPOS... */
+ 1 << (BITS_PER_SHORT - 1),
+ /* ... nor HPOS. */
+ 1 << (BITS_PER_SHORT - 1),
+ width, hscroll,
+ /* This compensates for start_hpos
+ so that a tab as first character
+ still occupies 8 columns. */
+ (XFASTINT (prevline) == BEG
+ ? -start_hpos : 0),
+ w);
vpos -= pos.vpos;
first = 0;
from = XFASTINT (prevline);
val_vmotion.hpos = lmargin;
val_vmotion.contin = 0;
val_vmotion.prevhpos = 0;
+ val_vmotion.ovstring_chars_done = 0;
+ val_vmotion.tab_offset = 0; /* For accumulating tab offset. */
return &val_vmotion;
}
}
/* Moving downward is simple, but must calculate from beg of line
to determine hpos of starting point */
- if (from > BEGV && FETCH_CHAR (from - 1) != '\n')
+ if (from > BEGV && FETCH_BYTE (from - 1) != '\n')
{
Lisp_Object propval;
lmargin + (XFASTINT (prevline) == BEG
? start_hpos : 0),
0,
- from, 1 << (BITS_PER_INT - 2), 0,
- width, hscroll, 0, w);
+ from,
+ /* Don't care for VPOS... */
+ 1 << (BITS_PER_SHORT - 1),
+ /* ... nor HPOS. */
+ 1 << (BITS_PER_SHORT - 1),
+ width, hscroll,
+ (XFASTINT (prevline) == BEG ? -start_hpos : 0),
+ w);
did_motion = 1;
}
else
{
pos.hpos = lmargin + (from == BEG ? start_hpos : 0);
pos.vpos = 0;
+ pos.tab_offset = 0;
did_motion = 0;
}
return compute_motion (from, vpos, pos.hpos, did_motion,
- ZV, vtarget, - (1 << (BITS_PER_INT - 2)),
- width, hscroll, pos.vpos * width, w);
+ ZV, vtarget, - (1 << (BITS_PER_SHORT - 1)),
+ width, hscroll,
+ pos.tab_offset - (from == BEG ? start_hpos : 0),
+ w);
}
DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0,
- "Move to start of screen line LINES lines down.\n\
-If LINES is negative, this is moving up.\n\
+ "Move point to start of the screen line LINES lines down.\n\
+If LINES is negative, this means moving up.\n\
+\n\
+This function is an ordinary cursor motion function\n\
+which calculates the new position based on how text would be displayed.\n\
+The new position may be the start of a line,\n\
+or just the start of a continuation line.\n\
+The function returns number of screen lines moved over;\n\
+that usually equals LINES, but may be closer to zero\n\
+if beginning or end of buffer was reached.\n\
\n\
The optional second argument WINDOW specifies the window to use for\n\
parameters such as width, horizontal scrolling, and so on.\n\
-the default is the selected window.\n\
-It does not matter what buffer is displayed in WINDOW.\n\
-`vertical-motion' always uses the current buffer.\n\
+The default is to use the selected window's parameters.\n\
\n\
-Sets point to position found; this may be start of line\n\
-or just the start of a continuation line.\n\
-Returns number of lines moved; may be closer to zero than LINES\n\
-if beginning or end of buffer was reached.")
+`vertical-motion' always uses the current buffer,\n\
+regardless of which buffer is displayed in WINDOW.\n\
+This is consistent with other cursor motion functions\n\
+and makes it possible to use `vertical-motion' in any buffer,\n\
+whether or not it is currently displayed in some window.")
(lines, window)
Lisp_Object lines, window;
{
else
window = selected_window;
- pos = *vmotion (point, (int) XINT (lines), XWINDOW (window));
+ pos = *vmotion (PT, (int) XINT (lines), XWINDOW (window));
SET_PT (pos.bufpos);
return make_number (pos.vpos);