/* Indentation functions.
- Copyright (C) 1985,86,87,88,93,94,95 Free Software Foundation, Inc.
+ Copyright (C) 1985,86,87,88,93,94,95,98 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#include <config.h>
#include "lisp.h"
#include "buffer.h"
+#include "charset.h"
+#include "category.h"
#include "indent.h"
+#include "keyboard.h"
#include "frame.h"
#include "window.h"
#include "termchar.h"
/* Value of MODIFF when current_column was called */
int last_known_column_modified;
+static int current_column_1 ();
+static int position_indentation ();
+
+/* 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)
}
\f
+/* Skip some invisible characters starting from POS.
+ This includes characters invisible because of text properties
+ and characters invisible because of overlays.
+
+ If position POS is followed by invisible characters,
+ skip some of them and return the position after them.
+ Otherwise return POS itself.
+
+ Set *NEXT_BOUNDARY_P to the next position at which
+ it will be necessary to call this function again.
+
+ Don't scan past TO, and don't set *NEXT_BOUNDARY_P
+ to a value greater than TO.
+
+ If WINDOW is non-nil, and this buffer is displayed in WINDOW,
+ take account of overlays that apply only in WINDOW.
+
+ We don't necessarily skip all the invisible characters after POS
+ because that could take a long time. We skip a reasonable number
+ which can be skipped quickly. If there might be more invisible
+ characters immediately following, then *NEXT_BOUNDARY_P
+ will equal the return value. */
+
+int
+skip_invisible (pos, next_boundary_p, to, window)
+ int pos;
+ int *next_boundary_p;
+ int to;
+ Lisp_Object window;
+{
+ Lisp_Object prop, position, overlay_limit, proplimit;
+ Lisp_Object buffer;
+ int end;
+
+ XSETFASTINT (position, pos);
+ XSETBUFFER (buffer, current_buffer);
+
+ /* Give faster response for overlay lookup near POS. */
+ recenter_overlay_lists (current_buffer, pos);
+
+ /* We must not advance farther than the next overlay change.
+ The overlay change might change the invisible property;
+ or there might be overlay strings to be displayed there. */
+ overlay_limit = Fnext_overlay_change (position);
+ /* As for text properties, this gives a lower bound
+ for where the invisible text property could change. */
+ proplimit = Fnext_property_change (position, buffer, Qt);
+ if (XFASTINT (overlay_limit) < XFASTINT (proplimit))
+ proplimit = overlay_limit;
+ /* PROPLIMIT is now a lower bound for the next change
+ in invisible status. If that is plenty far away,
+ use that lower bound. */
+ if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to)
+ *next_boundary_p = XFASTINT (proplimit);
+ /* Otherwise, scan for the next `invisible' property change. */
+ else
+ {
+ /* Don't scan terribly far. */
+ XSETFASTINT (proplimit, min (pos + 100, to));
+ /* No matter what. don't go past next overlay change. */
+ if (XFASTINT (overlay_limit) < XFASTINT (proplimit))
+ proplimit = overlay_limit;
+ end = XFASTINT (Fnext_single_property_change (position, Qinvisible,
+ buffer, proplimit));
+#if 0
+ /* 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--;
+#endif
+ *next_boundary_p = end;
+ }
+ /* if the `invisible' property is set, we can skip to
+ the next property change */
+ if (!NILP (window) && EQ (XWINDOW (window)->buffer, buffer))
+ prop = Fget_char_property (position, Qinvisible, window);
+ else
+ prop = Fget_char_property (position, Qinvisible, buffer);
+ if (TEXT_PROP_MEANS_INVISIBLE (prop))
+ return *next_boundary_p;
+ return pos;
+}
+\f
+/* If a composition starts at POS/POS_BYTE and it doesn't stride over
+ POINT, set *LEN / *LEN_BYTE to the character and byte lengths, *WIDTH
+ to the width, and return 1. Otherwise, return 0. */
+
+static int
+check_composition (pos, pos_byte, point, len, len_byte, width)
+ int pos, pos_byte, point;
+ int *len, *len_byte, *width;
+{
+ Lisp_Object prop;
+ int start, end;
+ int id;
+
+ if (! find_composition (pos, -1, &start, &end, &prop, Qnil)
+ || pos != start || point < end
+ || !COMPOSITION_VALID_P (start, end, prop))
+ return 0;
+ if ((id = get_composition_id (pos, pos_byte, end - pos, prop, Qnil)) < 0)
+ return 0;
+
+ *len = COMPOSITION_LENGTH (prop);
+ *len_byte = CHAR_TO_BYTE (end) - pos_byte;
+ *width = composition_table[id]->width;
+ return 1;
+}
+\f
+/* Set variables WIDTH and BYTES for a multibyte sequence starting at P.
+
+ DP is a display table or NULL.
+
+ This macro is used in current_column_1, Fmove_to_column, and
+ compute_motion. */
+
+#define MULTIBYTE_BYTES_WIDTH(p, dp) \
+ do { \
+ int c; \
+ \
+ wide_column = 0; \
+ c = STRING_CHAR_AND_LENGTH (p, MAX_MULTIBYTE_LENGTH, bytes); \
+ if (BYTES_BY_CHAR_HEAD (*p) != bytes) \
+ width = bytes * 4; \
+ else \
+ { \
+ if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c))) \
+ width = XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; \
+ else \
+ width = WIDTH_BY_CHAR_HEAD (*p); \
+ if (width > 1) \
+ wide_column = width; \
+ } \
+ } while (0)
+
DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0,
"Return the horizontal position of point. Beginning of line is column 0.\n\
This is calculated by adding together the widths of all the displayed\n\
/* Cancel any recorded value of the horizontal position. */
+void
invalidate_current_column ()
{
last_known_column_point = 0;
register int tab_width = XINT (current_buffer->tab_width);
int ctl_arrow = !NILP (current_buffer->ctl_arrow);
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, text properties,
+ or multibyte characters, use a more general algorithm. */
+ if (BUF_INTERVALS (current_buffer)
+ || !NILP (current_buffer->overlays_before)
+ || !NILP (current_buffer->overlays_after)
+ || Z != Z_BYTE)
+ return current_column_1 ();
+
+ /* 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 = BYTE_POS_ADDR (PT_BYTE - 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 = BYTE_TO_CHAR (PTR_BYTE_POS (ptr));
+
+ last_known_column = col;
+ last_known_column_point = PT;
+ last_known_column_modified = MODIFF;
+
+ return col;
+}
+\f
+/* Return the column number of position POS
+ by scanning forward from the beginning of the line.
+ This function handles characters that are invisible
+ due to text properties or overlays. */
+
+static int
+current_column_1 ()
+{
+ 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 ();
+ int multibyte = !NILP (current_buffer->enable_multibyte_characters);
+
+ /* Start the scan at the beginning of this line with column number 0. */
+ register int col = 0;
+ int scan, scan_byte;
+ int next_boundary, next_boundary_byte;
+ int opoint = PT, opoint_byte = PT_BYTE;
+
+ scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1);
+ current_column_bol_cache = PT;
+ scan = PT, scan_byte = PT_BYTE;
+ SET_PT_BOTH (opoint, opoint_byte);
+ next_boundary = scan;
+ next_boundary_byte = scan_byte;
+
+ if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
+
+ /* Scan forward to the target position. */
+ while (scan < opoint)
+ {
+ int c;
+
+ /* Occasionally we may need to skip invisible text. */
+ while (scan == next_boundary)
+ {
+ int old_scan = scan;
+ /* This updates NEXT_BOUNDARY to the next place
+ where we might need to skip more invisible text. */
+ scan = skip_invisible (scan, &next_boundary, opoint, Qnil);
+ if (scan >= opoint)
+ goto endloop;
+ if (scan != old_scan)
+ scan_byte = CHAR_TO_BYTE (scan);
+ next_boundary_byte = CHAR_TO_BYTE (next_boundary);
+ }
+
+ /* Check composition sequence. */
+ {
+ int len, len_byte, width;
+
+ if (check_composition (scan, scan_byte, opoint,
+ &len, &len_byte, &width))
+ {
+ scan += len;
+ scan_byte += len_byte;
+ if (scan <= opoint)
+ col += width;
+ continue;
+ }
+ }
+
+ c = FETCH_BYTE (scan_byte);
+ if (dp != 0
+ && ! (multibyte && BASE_LEADING_CODE_P (c))
+ && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ {
+ col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
+ scan++;
+ scan_byte++;
+ continue;
+ }
+ if (c == '\n')
+ break;
+ if (c == '\r' && EQ (current_buffer->selective_display, Qt))
+ break;
+ scan++;
+ scan_byte++;
+ if (c == '\t')
+ {
+ int prev_col = col;
+ col += tab_width;
+ col = col / tab_width * tab_width;
+ }
+ else if (multibyte && BASE_LEADING_CODE_P (c))
+ {
+ unsigned char *ptr;
+ int bytes, width, wide_column;
+
+ scan_byte--;
+ ptr = BYTE_POS_ADDR (scan_byte);
+ MULTIBYTE_BYTES_WIDTH (ptr, dp);
+ scan_byte += bytes;
+ col += width;
+ }
+ else if (ctl_arrow && (c < 040 || c == 0177))
+ col += 2;
+ else if (c < 040 || c >= 0177)
+ col += 4;
+ else
+ col++;
+ }
+ 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);
}
\f
+static int position_indentation P_ ((int));
+
DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation,
0, 0, 0,
"Return the indentation of the current line.\n\
()
{
Lisp_Object val;
+ int opoint = PT, opoint_byte = PT_BYTE;
- XSETFASTINT (val, position_indentation (find_next_newline (point, -1)));
+ scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -1, 1);
+
+ XSETFASTINT (val, position_indentation (PT_BYTE));
+ SET_PT_BOTH (opoint, opoint_byte);
return val;
}
-position_indentation (pos)
- register int pos;
+static int
+position_indentation (pos_byte)
+ register int pos_byte;
{
register int column = 0;
register int tab_width = XINT (current_buffer->tab_width);
register unsigned char *p;
register unsigned char *stop;
+ unsigned char *start;
+ int next_boundary_byte = pos_byte;
+ int ceiling = next_boundary_byte;
if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
- stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1;
- p = &FETCH_CHAR (pos);
+ p = BYTE_POS_ADDR (pos_byte);
+ /* 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. */
+ stop = p;
+ /* START records the starting value of P. */
+ start = p;
while (1)
{
while (p == stop)
{
- if (pos == ZV)
+ int stop_pos_byte;
+
+ /* If we have updated P, set POS_BYTE to match.
+ The first time we enter the loop, POS_BYTE is already right. */
+ if (p != start)
+ pos_byte = PTR_BYTE_POS (p);
+ /* Consider the various reasons STOP might have been set here. */
+ if (pos_byte == ZV_BYTE)
return column;
- pos += p - &FETCH_CHAR (pos);
- p = &FETCH_CHAR (pos);
- stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1;
+ if (pos_byte == next_boundary_byte)
+ {
+ int next_boundary;
+ int pos = BYTE_TO_CHAR (pos_byte);
+ pos = skip_invisible (pos, &next_boundary, ZV, Qnil);
+ pos_byte = CHAR_TO_BYTE (pos);
+ next_boundary_byte = CHAR_TO_BYTE (next_boundary);
+ }
+ if (pos_byte >= ceiling)
+ ceiling = BUFFER_CEILING_OF (pos_byte) + 1;
+ /* Compute the next place we need to stop and think,
+ and set STOP accordingly. */
+ stop_pos_byte = min (ceiling, next_boundary_byte);
+ /* The -1 and +1 arrange to point at the first byte of gap
+ (if STOP_POS_BYTE is the position of the gap)
+ rather than at the data after the gap. */
+
+ stop = BYTE_POS_ADDR (stop_pos_byte - 1) + 1;
+ p = BYTE_POS_ADDR (pos_byte);
}
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 c;
+ pos_byte = PTR_BYTE_POS (p - 1);
+ c = FETCH_MULTIBYTE_CHAR (pos_byte);
+ if (CHAR_HAS_CATEGORY (c, ' '))
+ {
+ column++;
+ INC_POS (pos_byte);
+ p = BYTE_POS_ADDR (pos_byte);
+ }
+ else
+ return column;
+ }
}
}
}
/* Test whether the line beginning at POS is indented beyond COLUMN.
Blank lines are treated as if they had the same indentation as the
preceding line. */
+
int
-indented_beyond_p (pos, column)
- int pos, column;
+indented_beyond_p (pos, pos_byte, column)
+ int pos, pos_byte, column;
{
- while (pos > BEGV && FETCH_CHAR (pos) == '\n')
- pos = find_next_newline_no_quit (pos - 1, -1);
- return (position_indentation (pos) >= column);
-}
+ int val;
+ int opoint = PT, opoint_byte = PT_BYTE;
+ SET_PT_BOTH (pos, pos_byte);
+ while (PT > BEGV && FETCH_BYTE (PT_BYTE) == '\n')
+ scan_newline (PT - 1, PT_BYTE - 1, BEGV, BEGV_BYTE, -1, 0);
+
+ val = position_indentation (PT_BYTE);
+ SET_PT_BOTH (opoint, opoint_byte);
+ return val >= column;
+}
\f
DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p",
"Move point to column COLUMN in the current line.\n\
\n\
If specified column is within a character, point goes after that character.\n\
If it's past end of line, point goes to end of line.\n\n\
-A non-nil second (optional) argument FORCE means, if the line\n\
-is too short to reach column COLUMN then add spaces/tabs to get there,\n\
-and if COLUMN is in the middle of a tab character, change it to spaces.\n\
+A non-nil second (optional) argument FORCE means,\n\
+if COLUMN is in the middle of a tab character, change it to spaces.\n\
+In addition, if FORCE is t, and the line is too short\n\
+to reach column COLUMN, add spaces/tabs to get there.\n\
\n\
The return value is the current column.")
(column, force)
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;
- int c;
+ int prev_col = 0;
+ int c = 0;
+ int next_boundary;
+
+ int pos_byte, end_byte, next_boundary_byte;
if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
CHECK_NATNUM (column, 0);
goal = XINT (column);
- retry:
- pos = point;
+ pos = PT;
+ pos_byte = PT_BYTE;
end = ZV;
+ end_byte = ZV_BYTE;
+ next_boundary = pos;
+ next_boundary_byte = PT_BYTE;
/* If we're starting past the desired column,
back up to beginning of line and scan from there. */
if (col > goal)
{
- pos = find_next_newline (pos, -1);
+ end = pos;
+ pos = current_column_bol_cache;
+ pos_byte = CHAR_TO_BYTE (pos);
col = 0;
}
- while (col < goal && pos < end)
+ while (pos < end)
{
- c = FETCH_CHAR (pos);
- if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ while (pos == next_boundary)
+ {
+ int prev = pos;
+ pos = skip_invisible (pos, &next_boundary, end, Qnil);
+ if (pos != prev)
+ pos_byte = CHAR_TO_BYTE (pos);
+ next_boundary_byte = CHAR_TO_BYTE (next_boundary);
+ if (pos >= end)
+ goto endloop;
+ }
+
+ /* 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;
+
+ /* Check composition sequence. */
+ {
+ int len, len_byte, width;
+
+ if (check_composition (pos, pos_byte, Z, &len, &len_byte, &width))
+ {
+ pos += len;
+ pos_byte += len_byte;
+ col += width;
+ continue;
+ }
+ }
+
+ c = FETCH_BYTE (pos_byte);
+ if (dp != 0
+ && ! (multibyte && BASE_LEADING_CODE_P (c))
+ && VECTORP (DISP_CHAR_VECTOR (dp, c)))
{
col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
+ pos_byte++;
pos++;
continue;
}
if (c == '\r' && EQ (current_buffer->selective_display, Qt))
break;
pos++;
+ pos_byte++;
if (c == '\t')
{
prev_col = col;
}
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;
+ int bytes, width, wide_column;
+
+ pos_byte--;
+ ptr = BYTE_POS_ADDR (pos_byte);
+ MULTIBYTE_BYTES_WIDTH (ptr, dp);
+ pos_byte += bytes;
+ col += width;
+ }
+ else
+ col += 4;
}
+ endloop:
- SET_PT (pos);
+ SET_PT_BOTH (pos, pos_byte);
/* If a tab char made us overshoot, change it to spaces
and scan through it again. */
if (!NILP (force) && col > goal && c == '\t' && prev_col < goal)
{
- int old_point;
-
- del_range (point - 1, point);
- Findent_to (make_number (goal), Qnil);
- old_point = point;
+ int goal_pt, goal_pt_byte;
+
+ /* Insert spaces in front of the tab to reach GOAL. Do this
+ first so that a marker at the end of the tab gets
+ adjusted. */
+ SET_PT_BOTH (PT - 1, PT_BYTE - 1);
+ Finsert_char (make_number (' '), make_number (goal - prev_col), Qt);
+
+ /* Now delete the tab, and indent to COL. */
+ del_range (PT, PT + 1);
+ goal_pt = PT;
+ goal_pt_byte = PT_BYTE;
Findent_to (make_number (col), Qnil);
- SET_PT (old_point);
+ SET_PT_BOTH (goal_pt, goal_pt_byte);
+
/* Set the last_known... vars consistently. */
col = goal;
}
/* If line ends prematurely, add space to the end. */
- if (col < goal && !NILP (force))
+ if (col < goal && EQ (force, Qt))
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);
return val;
}
-
\f
/* compute_motion: compute buffer posn given screen posn and vice versa */
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.
register int vpos = fromvpos;
register int pos;
- register int c;
+ int pos_byte;
+ register int c = 0;
register int tab_width = XFASTINT (current_buffer->tab_width);
register int ctl_arrow = !NILP (current_buffer->ctl_arrow);
register struct Lisp_Char_Table *dp = window_display_table (win);
= (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);
+ /* If previous char scanned was a wide character,
+ this is the column where it ended. Otherwise, this is 0. */
+ int wide_column_end_hpos = 0;
+ int prev_pos; /* Previous buffer position. */
+ int prev_pos_byte; /* 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);
run cache, because that's based on the buffer's display table. */
width_table = 0;
- if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
+ if (tab_width <= 0 || tab_width > 1000)
+ tab_width = 8;
- pos = from;
+ immediate_quit = 1;
+ QUIT;
+
+ pos = prev_pos = from;
+ pos_byte = prev_pos_byte = CHAR_TO_BYTE (from);
+ contin_hpos = 0;
+ prev_tab_offset = tab_offset;
while (1)
{
while (pos == next_boundary)
{
+ int pos_here = pos;
+ int newpos;
+
+ /* Don't skip invisible if we are already at the margin. */
+ if (vpos > tovpos || vpos == tovpos && hpos >= tohpos)
+ {
+ if (contin_hpos && prev_hpos == 0
+ && hpos > tohpos
+ && (contin_hpos == width || wide_column_end_hpos > width))
+ { /* 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;
+ pos_byte = prev_pos_byte;
+ hpos = prev_hpos;
+ tab_offset = prev_tab_offset;
+ }
+ break;
+ }
+
/* 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 && ovlen > 0)
+ ? strwidth (ovstr, ovlen) : ovlen);
+ }
did_motion = 0;
if (pos >= to)
break;
- {
- Lisp_Object prop, position, end, limit, proplimit;
-
- XSETFASTINT (position, pos);
-
- /* Give faster response for overlay lookup near POS. */
- recenter_overlay_lists (current_buffer, pos);
-
- /* We must not advance farther than the next overlay change.
- The overlay change might change the invisible property;
- or there might be overlay strings to be displayed there. */
- limit = Fnext_overlay_change (position);
- /* As for text properties, this gives a lower bound
- for where the invisible text property could change. */
- proplimit = Fnext_property_change (position, buffer, Qt);
- if (XFASTINT (limit) < XFASTINT (proplimit))
- proplimit = limit;
- /* PROPLIMIT is now a lower bound for the next change
- in invisible status. If that is plenty far away,
- use that lower bound. */
- if (XFASTINT (proplimit) > pos + 100 || XFASTINT (proplimit) >= to)
- next_boundary = XFASTINT (proplimit);
- /* Otherwise, scan for the next `invisible' property change. */
- else
- {
- /* Don't scan terribly far. */
- XSETFASTINT (proplimit, min (pos + 100, to));
- /* No matter what. don't go past next overlay change. */
- if (XFASTINT (limit) < XFASTINT (proplimit))
- proplimit = limit;
- end = Fnext_single_property_change (position, Qinvisible,
- buffer, proplimit);
- next_boundary = XFASTINT (end);
- }
- /* if the `invisible' property is set, we can skip to
- the next property change */
- prop = Fget_char_property (position, Qinvisible, window);
- if (TEXT_PROP_MEANS_INVISIBLE (prop))
- pos = next_boundary;
- }
+ /* Advance POS past invisible characters
+ (but not necessarily all that there are here),
+ and store in next_boundary the next position where
+ we need to call skip_invisible. */
+ newpos = skip_invisible (pos, &next_boundary, to, window);
+
+ if (newpos >= to)
+ {
+ pos = min (to, newpos);
+ pos_byte = CHAR_TO_BYTE (pos);
+ goto after_loop;
+ }
+
+ if (newpos != pos_here)
+ {
+ pos = newpos;
+ pos_byte = CHAR_TO_BYTE (pos);
+ }
}
/* 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
&& width + 1 < FRAME_WIDTH (XFRAME (WINDOW_FRAME (win))))
|| !NILP (current_buffer->truncate_lines))
{
- /* Truncating: skip to newline. */
- 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;
+ /* Truncating: skip to newline, unless we are already past
+ TO (we need to go back below). */
+ if (pos <= to)
+ {
+ pos = find_before_next_newline (pos, to, 1);
+ pos_byte = CHAR_TO_BYTE (pos);
+ 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_end_hpos > width)
+ {
+ 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;
+ pos_byte = prev_pos_byte;
+ 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_end_hpos)
+ {
+ /* 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_end_hpos > width))
+ { /* 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;
+ pos_byte = prev_pos_byte;
+ 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;
+ prev_pos_byte = pos_byte;
+ wide_column_end_hpos = 0;
/* Consult the width run cache to see if we can avoid inspecting
the text character-by-character. */
hpos = run_end_hpos;
if (run_end > pos)
prev_hpos = hpos - common_width;
- pos = run_end;
+ if (pos != run_end)
+ {
+ pos = run_end;
+ pos_byte = CHAR_TO_BYTE (pos);
+ }
}
next_width_run = run_end + 1;
/* We have to scan the text character-by-character. */
else
{
- c = FETCH_CHAR (pos);
- pos++;
+ c = FETCH_BYTE (pos_byte);
+
+ /* Check composition sequence. */
+ {
+ int len, len_byte, width;
+
+ if (check_composition (pos, pos_byte, to, &len, &len_byte, &width))
+ {
+ pos += len;
+ pos_byte += len_byte;
+ hpos += width;
+ continue;
+ }
+ }
+
+ pos++, pos_byte++;
/* Perhaps add some info to the width_run_cache. */
if (current_buffer->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
+ && ! (multibyte && BASE_LEADING_CODE_P (c))
+ && VECTORP (DISP_CHAR_VECTOR (dp, c)))
hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
else if (c >= 040 && c < 0177)
hpos++;
}
else if (c == '\n')
{
- if (selective > 0 && indented_beyond_p (pos, selective))
+ if (selective > 0
+ && indented_beyond_p (pos, pos_byte, 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);
+ if (pos < to)
+ pos++;
+ pos_byte = CHAR_TO_BYTE (pos);
+ }
+ while (pos < to
+ && indented_beyond_p (pos, pos_byte, selective));
+ /* Allow for the " ..." that is displayed for them. */
+ if (selective_rlen)
+ {
+ hpos += selective_rlen;
+ if (hpos >= width)
+ hpos = width;
+ }
+ DEC_BOTH (pos, pos_byte);
+ /* 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);
+ pos_byte = CHAR_TO_BYTE (pos);
+ }
/* 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 bytes, width, wide_column;
+
+ pos_byte--; /* rewind POS_BYTE */
+ ptr = BYTE_POS_ADDR (pos_byte);
+ MULTIBYTE_BYTES_WIDTH (ptr, dp);
+ pos_byte += bytes;
+ if (wide_column)
+ wide_column_end_hpos = hpos + wide_column;
+ hpos += width;
+ }
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
width_run_start, width_run_end);
val_compute_motion.bufpos = pos;
+ val_compute_motion.bytepos = pos_byte;
val_compute_motion.hpos = hpos;
val_compute_motion.vpos = vpos;
- val_compute_motion.prevhpos = prev_hpos;
+ if (contin_hpos && prev_hpos == 0)
+ val_compute_motion.prevhpos = contin_hpos;
+ else
+ 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);
+ immediate_quit = 0;
return &val_compute_motion;
}
+
#if 0 /* The doc string is too long for some compilers,
but make-docfile can find it in this comment. */
DEFUN ("compute-motion", Ffoo, Sfoo, 7, 7, 0,
being displayed, perhaps because the line was continued within it.\n\
If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.\n\
\n\
-WINDOW is the window to operate on. Currently this is used only to\n\
-find the display table. It does not matter what buffer WINDOW displays;\n\
-`compute-motion' always operates on the current buffer.\n\
+WINDOW is the window to operate on. It is used to choose the display table;\n\
+if it is showing the current buffer, it is used also for\n\
+deciding which overlay properties apply.\n\
+Note that `compute-motion' always operates on the current buffer.\n\
\n\
The value is a list of five elements:\n\
(POS HPOS VPOS PREVHPOS CONTIN)\n\
Lisp_Object from, frompos, to, topos;
Lisp_Object width, offsets, window;
{
- Lisp_Object bufpos, hpos, vpos, prevhpos, contin;
+ Lisp_Object bufpos, hpos, vpos, prevhpos;
struct position *pos;
int hscroll, tab_offset;
CHECK_NUMBER_COERCE_MARKER (from, 0);
CHECK_CONS (frompos, 0);
- CHECK_NUMBER (XCONS (frompos)->car, 0);
- CHECK_NUMBER (XCONS (frompos)->cdr, 0);
+ CHECK_NUMBER (XCAR (frompos), 0);
+ CHECK_NUMBER (XCDR (frompos), 0);
CHECK_NUMBER_COERCE_MARKER (to, 0);
CHECK_CONS (topos, 0);
- CHECK_NUMBER (XCONS (topos)->car, 0);
- CHECK_NUMBER (XCONS (topos)->cdr, 0);
+ CHECK_NUMBER (XCAR (topos), 0);
+ CHECK_NUMBER (XCDR (topos), 0);
CHECK_NUMBER (width, 0);
if (!NILP (offsets))
{
CHECK_CONS (offsets, 0);
- CHECK_NUMBER (XCONS (offsets)->car, 0);
- CHECK_NUMBER (XCONS (offsets)->cdr, 0);
- hscroll = XINT (XCONS (offsets)->car);
- tab_offset = XINT (XCONS (offsets)->cdr);
+ CHECK_NUMBER (XCAR (offsets), 0);
+ CHECK_NUMBER (XCDR (offsets), 0);
+ hscroll = XINT (XCAR (offsets));
+ tab_offset = XINT (XCDR (offsets));
}
else
hscroll = tab_offset = 0;
else
CHECK_LIVE_WINDOW (window, 0);
- pos = compute_motion (XINT (from), XINT (XCONS (frompos)->cdr),
- XINT (XCONS (frompos)->car), 0,
- XINT (to), XINT (XCONS (topos)->cdr),
- XINT (XCONS (topos)->car),
+ if (XINT (from) < BEGV || XINT (from) > ZV)
+ args_out_of_range_3 (from, make_number (BEGV), make_number (ZV));
+ if (XINT (to) < BEGV || XINT (to) > ZV)
+ args_out_of_range_3 (to, make_number (BEGV), make_number (ZV));
+
+ pos = compute_motion (XINT (from), XINT (XCDR (frompos)),
+ XINT (XCAR (frompos)), 0,
+ XINT (to), XINT (XCDR (topos)),
+ XINT (XCAR (topos)),
XINT (width), hscroll, tab_offset,
XWINDOW (window));
}
\f
-/* Return the column of position POS in window W's buffer.
- The result is rounded down to a multiple of the internal width of W.
- This is the amount of indentation of position POS
- that is not visible in its horizontal position in the window. */
-
-int
-pos_tab_offset (w, pos)
- struct window *w;
- register int pos;
-{
- int opoint = PT;
- int col;
- int width = window_internal_width (w) - 1;
-
- if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n')
- return 0;
- TEMP_SET_PT (pos);
- col = current_column ();
- TEMP_SET_PT (opoint);
- return col - (col % width);
-}
-
-\f
/* Fvertical_motion and vmotion */
struct position val_vmotion;
register int vpos = 0;
Lisp_Object prevline;
register int first;
+ int from_byte;
int lmargin = hscroll > 0 ? 1 - hscroll : 0;
int selective
= (INTEGERP (current_buffer->selective_display)
Lisp_Object window;
int start_hpos = 0;
int did_motion;
+ /* This is the object we use for fetching character properties. */
+ Lisp_Object text_prop_object;
XSETWINDOW (window, w);
- /* The omission of the clause
- && marker_position (w->start) == BEG
- here is deliberate; I think we want to measure from the prompt
- position even if the minibuffer window has scrolled. */
- if (EQ (window, minibuf_window))
- {
- if (minibuf_prompt_width == 0 && STRINGP (minibuf_prompt))
- minibuf_prompt_width
- = string_display_width (minibuf_prompt, Qnil, Qnil);
-
- start_hpos = minibuf_prompt_width;
- }
+ /* If the window contains this buffer, use it for getting text properties.
+ Otherwise use the current buffer as arg for doing that. */
+ if (EQ (w->buffer, Fcurrent_buffer ()))
+ text_prop_object = window;
+ else
+ text_prop_object = Fcurrent_buffer ();
if (vpos >= vtarget)
{
/* To move upward, go a line at a time until
- we have gone at least far enough */
+ we have gone at least far enough. */
first = 1;
XSETFASTINT (prevline, find_next_newline_no_quit (from - 1, -1));
while (XFASTINT (prevline) > BEGV
&& ((selective > 0
- && indented_beyond_p (XFASTINT (prevline), selective))
-#ifdef USE_TEXT_PROPERTIES
+ && indented_beyond_p (XFASTINT (prevline),
+ CHAR_TO_BYTE (XFASTINT (prevline)),
+ selective))
/* watch out for newlines with `invisible' property */
|| (propval = Fget_char_property (prevline,
Qinvisible,
- window),
- TEXT_PROP_MEANS_INVISIBLE (propval))
-#endif
- ))
+ text_prop_object),
+ TEXT_PROP_MEANS_INVISIBLE (propval))))
XSETFASTINT (prevline,
find_next_newline_no_quit (XFASTINT (prevline) - 1,
-1));
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);
if (vpos >= vtarget)
{
val_vmotion.bufpos = from;
+ val_vmotion.bytepos = CHAR_TO_BYTE (from);
val_vmotion.vpos = vpos;
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')
+ from_byte = CHAR_TO_BYTE (from);
+ if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n')
{
Lisp_Object propval;
XSETFASTINT (prevline, find_next_newline_no_quit (from, -1));
while (XFASTINT (prevline) > BEGV
&& ((selective > 0
- && indented_beyond_p (XFASTINT (prevline), selective))
-#ifdef USE_TEXT_PROPERTIES
+ && indented_beyond_p (XFASTINT (prevline),
+ CHAR_TO_BYTE (XFASTINT (prevline)),
+ selective))
/* watch out for newlines with `invisible' property */
|| (propval = Fget_char_property (prevline, Qinvisible,
- window),
- TEXT_PROP_MEANS_INVISIBLE (propval))
-#endif
- ))
+ text_prop_object),
+ TEXT_PROP_MEANS_INVISIBLE (propval))))
XSETFASTINT (prevline,
find_next_newline_no_quit (XFASTINT (prevline) - 1,
-1));
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;
{
- struct position pos;
+ struct it it;
+ struct text_pos pt;
+ struct window *w;
+ Lisp_Object old_buffer;
+ struct gcpro gcpro1;
CHECK_NUMBER (lines, 0);
if (! NILP (window))
CHECK_WINDOW (window, 0);
else
window = selected_window;
+ w = XWINDOW (window);
- pos = *vmotion (point, (int) XINT (lines), XWINDOW (window));
-
- SET_PT (pos.bufpos);
- return make_number (pos.vpos);
+ old_buffer = Qnil;
+ GCPRO1 (old_buffer);
+ if (XBUFFER (w->buffer) != current_buffer)
+ {
+ /* Set the window's buffer temporarily to the current buffer. */
+ old_buffer = w->buffer;
+ XSETBUFFER (w->buffer, current_buffer);
+ }
+
+ SET_TEXT_POS (pt, PT, PT_BYTE);
+ start_display (&it, w, pt);
+ move_it_by_lines (&it, XINT (lines), 0);
+ SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
+
+ if (BUFFERP (old_buffer))
+ w->buffer = old_buffer;
+
+ RETURN_UNGCPRO (make_number (it.vpos));
}
+
+
\f
/* file's initialization. */
+void
syms_of_indent ()
{
DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode,
HCoop / bpt / emacs.git / blobdiff