/* Indentation functions.
- Copyright (C) 1985,86,87,88,93,94 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.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
+the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#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"
#include "termopts.h"
#include "disptab.h"
#include "intervals.h"
+#include "region-cache.h"
/* Indentation can insert tabs if this is non-zero;
otherwise always uses spaces */
/* 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_Vector *
+struct Lisp_Char_Table *
buffer_display_table ()
{
Lisp_Object thisbuf;
thisbuf = current_buffer->display_table;
- if (VECTORP (thisbuf) && XVECTOR (thisbuf)->size == DISP_TABLE_SIZE)
- return XVECTOR (thisbuf);
- if (VECTORP (Vstandard_display_table)
- && XVECTOR (Vstandard_display_table)->size == DISP_TABLE_SIZE)
- return XVECTOR (Vstandard_display_table);
+ if (DISP_TABLE_P (thisbuf))
+ return XCHAR_TABLE (thisbuf);
+ if (DISP_TABLE_P (Vstandard_display_table))
+ return XCHAR_TABLE (Vstandard_display_table);
return 0;
}
\f
+/* Width run cache considerations. */
+
+/* Return the width of character C under display table DP. */
+
+static int
+character_width (c, dp)
+ int c;
+ struct Lisp_Char_Table *dp;
+{
+ Lisp_Object elt;
+
+ /* These width computations were determined by examining the cases
+ in display_text_line. */
+
+ /* Everything can be handled by the display table, if it's
+ present and the element is right. */
+ if (dp && (elt = DISP_CHAR_VECTOR (dp, c), VECTORP (elt)))
+ return XVECTOR (elt)->size;
+
+ /* Some characters are special. */
+ if (c == '\n' || c == '\t' || c == '\015')
+ return 0;
+
+ /* Printing characters have width 1. */
+ else if (c >= 040 && c < 0177)
+ return 1;
+
+ /* Everybody else (control characters, metacharacters) has other
+ widths. We could return their actual widths here, but they
+ depend on things like ctl_arrow and crud like that, and they're
+ not very common at all. So we'll just claim we don't know their
+ widths. */
+ else
+ return 0;
+}
+
+/* Return true iff the display table DISPTAB specifies the same widths
+ for characters as WIDTHTAB. We use this to decide when to
+ invalidate the buffer's width_run_cache. */
+int
+disptab_matches_widthtab (disptab, widthtab)
+ struct Lisp_Char_Table *disptab;
+ struct Lisp_Vector *widthtab;
+{
+ int i;
+
+ if (widthtab->size != 256)
+ abort ();
+
+ for (i = 0; i < 256; i++)
+ if (character_width (i, disptab)
+ != XFASTINT (widthtab->contents[i]))
+ return 0;
+
+ return 1;
+}
+
+/* Recompute BUF's width table, using the display table DISPTAB. */
+void
+recompute_width_table (buf, disptab)
+ struct buffer *buf;
+ struct Lisp_Char_Table *disptab;
+{
+ int i;
+ struct Lisp_Vector *widthtab;
+
+ if (!VECTORP (buf->width_table))
+ buf->width_table = Fmake_vector (make_number (256), make_number (0));
+ widthtab = XVECTOR (buf->width_table);
+ if (widthtab->size != 256)
+ abort ();
+
+ for (i = 0; i < 256; i++)
+ XSETFASTINT (widthtab->contents[i], character_width (i, disptab));
+}
+
+/* Allocate or free the width run cache, as requested by the current
+ state of current_buffer's cache_long_line_scans variable. */
+static void
+width_run_cache_on_off ()
+{
+ 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)
+ {
+ free_region_cache (current_buffer->width_run_cache);
+ current_buffer->width_run_cache = 0;
+ current_buffer->width_table = Qnil;
+ }
+ }
+ else
+ {
+ /* It should be on. */
+ if (current_buffer->width_run_cache == 0)
+ {
+ current_buffer->width_run_cache = new_region_cache ();
+ recompute_width_table (current_buffer, buffer_display_table ());
+ }
+ }
+}
+
+\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 c;
register int tab_width = XINT (current_buffer->tab_width);
int ctl_arrow = !NILP (current_buffer->ctl_arrow);
- register struct Lisp_Vector *dp = buffer_display_table ();
- int stopchar;
+ register struct Lisp_Char_Table *dp = buffer_display_table ();
- 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;
}
c = *--ptr;
- if (c >= 040 && c < 0177
- && (dp == 0 || !VECTORP (DISP_CHAR_VECTOR (dp, c))))
+ if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
+ else if (c >= 040 && c < 0177)
+ col++;
+ else if (c == '\n'
+ || (c == '\r' && EQ (current_buffer->selective_display, Qt)))
{
- col++;
+ ptr++;
+ break;
}
- else if (c == '\n')
- break;
- else if (c == '\r' && EQ (current_buffer->selective_display, Qt))
- break;
else if (c == '\t')
{
if (tab_seen)
col = 0;
tab_seen = 1;
}
- else if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
- col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
else
col += (ctl_arrow && c < 0200) ? 2 : 4;
}
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;
}
\f
+/* Return the width in columns of the part of STRING from BEG to END.
+ If BEG is nil, that stands for the beginning of STRING.
+ If END is nil, that stands for the end of STRING. */
+
+static int
+string_display_width (string, beg, end)
+ Lisp_Object string, beg, end;
+{
+ register int col;
+ register unsigned char *ptr, *stop;
+ register int tab_seen;
+ int post_tab;
+ register int c;
+ 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 b, e;
+
+ if (NILP (end))
+ e = XSTRING (string)->size;
+ else
+ {
+ CHECK_NUMBER (end, 0);
+ e = XINT (end);
+ }
+
+ if (NILP (beg))
+ b = 0;
+ else
+ {
+ CHECK_NUMBER (beg, 0);
+ b = XINT (beg);
+ }
+
+ /* Make a pointer for decrementing through the chars before point. */
+ ptr = XSTRING (string)->data + e;
+ /* Make a pointer to where consecutive chars leave off,
+ going backwards from point. */
+ stop = XSTRING (string)->data + b;
+
+ if (tab_width <= 0 || tab_width > 1000) tab_width = 8;
+
+ col = 0, tab_seen = 0, post_tab = 0;
+
+ while (1)
+ {
+ if (ptr == stop)
+ break;
+
+ c = *--ptr;
+ if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
+ col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
+ else if (c >= 040 && c < 0177)
+ col++;
+ else if (c == '\n')
+ break;
+ else if (c == '\t')
+ {
+ if (tab_seen)
+ col = ((col + tab_width) / tab_width) * tab_width;
+
+ post_tab += col;
+ col = 0;
+ tab_seen = 1;
+ }
+ else
+ col += (ctl_arrow && c < 0200) ? 2 : 4;
+ }
+ if (tab_seen)
+ {
+ col = ((col + tab_width) / tab_width) * tab_width;
+ col += post_tab;
+ }
+
+ return col;
+}
+\f
DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ",
"Indent from point with tabs and spaces until COLUMN is reached.\n\
-Optional second argument MIN says always do at least MIN spaces\n\
-even if that goes past COLUMN; by default, MIN is zero.")
- (col, minimum)
- Lisp_Object col, minimum;
+Optional second argument MININUM says always do at least MININUM spaces\n\
+even if that goes past COLUMN; by default, MININUM is zero.")
+ (column, minimum)
+ Lisp_Object column, minimum;
{
int mincol;
register int fromcol;
register int tab_width = XINT (current_buffer->tab_width);
- CHECK_NUMBER (col, 0);
+ CHECK_NUMBER (column, 0);
if (NILP (minimum))
XSETFASTINT (minimum, 0);
CHECK_NUMBER (minimum, 1);
fromcol = current_column ();
mincol = fromcol + XINT (minimum);
- if (mincol < XINT (col)) mincol = XINT (col);
+ if (mincol < XINT (column)) mincol = XINT (column);
if (fromcol == mincol)
return make_number (mincol);
}
}
- XSETFASTINT (col, mincol - fromcol);
- Finsert_char (make_number (' '), col, Qt);
+ XSETFASTINT (column, mincol - fromcol);
+ 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 (col, mincol);
- return col;
+ XSETINT (column, mincol);
+ return column;
}
+
\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, 0,
+DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, "p",
"Move point to column COLUMN in the current line.\n\
The column of a character is calculated by adding together the widths\n\
as displayed of the previous characters in the 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.")
+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)
Lisp_Object column, force;
{
register int end;
register int tab_width = XINT (current_buffer->tab_width);
register int ctl_arrow = !NILP (current_buffer->ctl_arrow);
- register struct Lisp_Vector *dp = buffer_display_table ();
+ 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);
+ 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 == '\n')
break;
if (c == '\r' && EQ (current_buffer->selective_display, Qt))
break;
pos++;
+ pos_byte++;
if (c == '\t')
{
prev_col = col;
col += tab_width;
col = col / tab_width * tab_width;
}
- else 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;
+ 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 */
+
struct position val_compute_motion;
/* Scan the current buffer forward from offset FROM, pretending that
this is at line FROMVPOS, column FROMHPOS, until reaching buffer
offset TO or line TOVPOS, column TOHPOS (whichever comes first),
- and return the ending buffer position and screen location.
+ and return the ending buffer position and screen location. If we
+ can't hit the requested column exactly (because of a tab or other
+ multi-column character), overshoot.
+
+ DID_MOTION is 1 if FROMHPOS has already accounted for overlay strings
+ at FROM. This is the case if FROMVPOS and FROMVPOS came from an
+ earlier call to compute_motion. The other common case is that FROMHPOS
+ is zero and FROM is a position that "belongs" at column zero, but might
+ be shifted by overlay strings; in this case DID_MOTION should be 0.
WIDTH is the number of columns available to display text;
compute_motion uses this to handle continuation lines and such.
compute_motion returns a pointer to a struct position. The bufpos
member gives the buffer position at the end of the scan, and hpos
- and vpos give its cartesian location. I'm not clear on what the
- other members are.
+ and vpos give its cartesian location. prevhpos is the column at
+ which the character before bufpos started, and contin is non-zero
+ if we reached the current line by continuing the previous.
Note that FROMHPOS and TOHPOS should be expressed in real screen
columns, taking HSCROLL and the truncation glyph at the left margin
and the window's upper-left coordinates as FROMVPOS and FROMHPOS.
Pass the buffer's ZV as TO, to limit the scan to the end of the
visible section of the buffer, and pass LINE and COL as TOVPOS and
- TOHPOS.
+ TOHPOS.
When displaying in window w, a typical formula for WIDTH is:
the scroll bars if they are turned on. */
struct position *
-compute_motion (from, fromvpos, fromhpos, to, tovpos, tohpos, width, hscroll, tab_offset, win)
+compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width, hscroll, tab_offset, win)
int from, fromvpos, fromhpos, to, tovpos, tohpos;
+ int did_motion;
register int width;
int hscroll, tab_offset;
struct window *win;
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_Vector *dp = window_display_table (win);
+ register struct Lisp_Char_Table *dp = window_display_table (win);
int selective
= (INTEGERP (current_buffer->selective_display)
? XINT (current_buffer->selective_display)
: !NILP (current_buffer->selective_display) ? -1 : 0);
- int prev_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);
-#ifdef USE_TEXT_PROPERTIES
- /* The next location where the `invisible' property changes */
- int next_invisible = from;
- Lisp_Object prop, position;
-#endif
+ /* The next location where the `invisible' property changes, or an
+ overlay starts or ends. */
+ int next_boundary = from;
+
+ /* For computing runs of characters with similar widths.
+ Invariant: width_run_width is zero, or all the characters
+ from width_run_start to width_run_end have a fixed width of
+ width_run_width. */
+ int width_run_start = from;
+ int width_run_end = from;
+ int width_run_width = 0;
+ Lisp_Object *width_table;
+ Lisp_Object buffer;
+
+ /* The next buffer pos where we should consult the width run cache. */
+ 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);
+
+ width_run_cache_on_off ();
+ if (dp == buffer_display_table ())
+ width_table = (VECTORP (current_buffer->width_table)
+ ? XVECTOR (current_buffer->width_table)->contents
+ : 0);
+ else
+ /* If the window has its own display table, we can't use the width
+ 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;
- for (pos = from; pos < to; pos++)
- {
- /* Stop if past the target screen position. */
- if (vpos > tovpos
- || (vpos == tovpos && hpos >= tohpos))
- break;
+ if (tab_width <= 0 || tab_width > 1000)
+ tab_width = 8;
- prev_vpos = vpos;
- prev_hpos = hpos;
+ immediate_quit = 1;
+ QUIT;
-#ifdef USE_TEXT_PROPERTIES
- /* if the `invisible' property is set, we can skip to
- the next property change */
- while (pos == next_invisible && pos < to)
- {
- XSETFASTINT (position, pos);
- prop = Fget_char_property (position,
- Qinvisible,
- Fcurrent_buffer ());
- {
- Lisp_Object end, limit;
-
- recenter_overlay_lists (current_buffer, pos);
- /* This is just an estimate to give reasonable
- performance; nothing should go wrong if it is too small. */
- limit = Fnext_overlay_change (position);
- if (XFASTINT (limit) > pos + 100)
- XSETFASTINT (limit, pos + 100);
- end = Fnext_single_property_change (position, Qinvisible,
- Fcurrent_buffer (), limit);
- if (INTEGERP (end))
- next_invisible = XINT (end);
- else
- next_invisible = to;
- if (! NILP (prop))
- pos = next_invisible;
- }
- }
- if (pos >= to)
- break;
-#endif
- c = FETCH_CHAR (pos);
- if (c >= 040 && c < 0177
- && (dp == 0 || !VECTORP (DISP_CHAR_VECTOR (dp, c))))
- hpos++;
- else if (c == '\t')
- {
- hpos += tab_width - ((hpos + tab_offset + hscroll - (hscroll > 0)
- /* Add tab_width here to make sure positive.
- hpos can be negative after continuation
- but can't be less than -tab_width. */
- + tab_width)
- % tab_width);
- }
- else if (c == '\n')
+ 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)
{
- if (selective > 0 && indented_beyond_p (pos + 1, selective))
+ int pos_here = pos;
+ int newpos;
+
+ /* Don't skip invisible if we are already at the margin. */
+ if (vpos > tovpos || vpos == tovpos && hpos >= tohpos)
{
- /* Skip any number of invisible lines all at once */
- do
- {
- while (++pos < to && FETCH_CHAR (pos) != '\n');
- }
- while (pos < to && indented_beyond_p (pos + 1, selective));
- pos--; /* Reread the newline on the next pass. */
- /* Allow for the " ..." that is displayed for them. */
- if (selective_rlen)
- {
- hpos += selective_rlen;
- if (hpos >= width)
- hpos = width;
+ 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;
}
- /* We have skipped the invis text, but not the newline after. */
+ break;
}
- else
+
+ /* 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 not contain TAB;
+ if we want to relax that restriction, something will have
+ to be changed here. */
{
- /* A visible line. */
- vpos++;
- hpos = 0;
- hpos -= hscroll;
- if (hscroll > 0) hpos++; /* Truncation glyph on column 0 */
- tab_offset = 0;
+ unsigned char *ovstr;
+ int ovlen = overlay_strings (pos, win, &ovstr);
+ hpos += ((multibyte && ovlen > 0)
+ ? strwidth (ovstr, ovlen) : ovlen);
}
- }
- else if (c == CR && selective < 0)
- {
- /* In selective display mode,
- everything from a ^M to the end of the line is invisible */
- while (pos < to && FETCH_CHAR (pos) != '\n') pos++;
- /* Stop *before* the real newline. */
- pos--;
- /* Allow for the " ..." that is displayed for them. */
- if (selective_rlen)
+ did_motion = 0;
+
+ if (pos >= to)
+ break;
+
+ /* 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)
{
- hpos += selective_rlen;
- if (hpos >= width)
- hpos = width;
+ pos = newpos;
+ pos_byte = CHAR_TO_BYTE (pos);
}
}
- else if (dp != 0 && VECTORP (DISP_CHAR_VECTOR (dp, c)))
- hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size;
- else
- hpos += (ctl_arrow && c < 0200) ? 2 : 4;
/* Handle right margin. */
- if (hpos >= width
- && (hpos > width
- || (pos < ZV - 1
- && FETCH_CHAR (pos + 1) != '\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 (vpos > tovpos
- || (vpos == tovpos && hpos >= tohpos))
- break;
if (hscroll
|| (truncate_partial_width_windows
&& width + 1 < FRAME_WIDTH (XFRAME (WINDOW_FRAME (win))))
|| !NILP (current_buffer->truncate_lines))
{
- /* Truncating: skip to newline. */
- while (pos < to && FETCH_CHAR (pos) != '\n') pos++;
- pos--;
- hpos = width;
+ /* 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. */
+ /* 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++;
- hpos -= width;
- tab_offset += width;
+ contin_hpos = prev_hpos;
+ prev_hpos = 0;
}
+ }
+ /* Stop if past the target buffer position or screen position. */
+ 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_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. */
+ if (current_buffer->width_run_cache && pos >= next_width_run)
+ {
+ int run_end;
+ int common_width
+ = region_cache_forward (current_buffer,
+ current_buffer->width_run_cache,
+ pos, &run_end);
+
+ /* A width of zero means the character's width varies (like
+ a tab), is meaningless (like a newline), or we just don't
+ want to skip over it for some other reason. */
+ if (common_width != 0)
+ {
+ int run_end_hpos;
+
+ /* Don't go past the final buffer posn the user
+ requested. */
+ if (run_end > to)
+ run_end = to;
+
+ run_end_hpos = hpos + (run_end - pos) * common_width;
+
+ /* Don't go past the final horizontal position the user
+ requested. */
+ if (vpos == tovpos && run_end_hpos > tohpos)
+ {
+ run_end = pos + (tohpos - hpos) / common_width;
+ run_end_hpos = hpos + (run_end - pos) * common_width;
+ }
+
+ /* Don't go past the margin. */
+ if (run_end_hpos >= width)
+ {
+ run_end = pos + (width - hpos) / common_width;
+ run_end_hpos = hpos + (run_end - pos) * common_width;
+ }
+
+ hpos = run_end_hpos;
+ if (run_end > pos)
+ prev_hpos = hpos - common_width;
+ 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_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
+ && XFASTINT (width_table[c]) == width_run_width)
+ width_run_end = pos;
+
+ /* The previous run is over, since this is a character at a
+ different position, or a different width. */
+ else
+ {
+ /* Have we accumulated a run to put in the cache?
+ (Currently, we only cache runs of width == 1). */
+ if (width_run_start < width_run_end
+ && width_run_width == 1)
+ know_region_cache (current_buffer,
+ current_buffer->width_run_cache,
+ width_run_start, width_run_end);
+
+ /* Start recording a new width run. */
+ width_run_width = XFASTINT (width_table[c]);
+ width_run_start = pos - 1;
+ width_run_end = pos;
+ }
+ }
+
+ 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 == '\t')
+ {
+ int tem = (hpos + tab_offset + hscroll - (hscroll > 0)) % tab_width;
+ if (tem < 0)
+ tem += tab_width;
+ hpos += tab_width - tem;
+ }
+ else if (c == '\n')
+ {
+ if (selective > 0
+ && indented_beyond_p (pos, pos_byte, selective))
+ {
+ /* If (pos == to), we don't have to take care of
+ selective display. */
+ if (pos < to)
+ {
+ /* 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. */
+ }
+ }
+ else
+ {
+ /* A visible line. */
+ vpos++;
+ hpos = 0;
+ hpos -= hscroll;
+ /* Count the truncation glyph on column 0 */
+ if (hscroll > 0)
+ 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. */
+ 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. */
+ if (pos > next_boundary)
+ next_boundary = pos;
+ /* Allow for the " ..." that is displayed for them. */
+ if (selective_rlen)
+ {
+ hpos += selective_rlen;
+ if (hpos >= width)
+ 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)
+ know_region_cache (current_buffer, current_buffer->width_run_cache,
+ 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),
- 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,
- 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);
-}
-
-/* start_hpos is the hpos of the first character of the buffer:
- zero except for the minibuffer window,
- where it is the width of the prompt. */
-
+/* Fvertical_motion and vmotion */
struct position val_vmotion;
struct position *
-vmotion (from, vtarget, width, hscroll, window)
- register int from, vtarget, width;
- int hscroll;
- Lisp_Object window;
+vmotion (from, vtarget, w)
+ register int from, vtarget;
+ struct window *w;
{
+ int width = window_internal_width (w) - 1;
+ int hscroll = XINT (w->hscroll);
struct position pos;
/* vpos is cumulative vertical position, changed as from is changed */
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)
? XINT (current_buffer->selective_display)
: !NILP (current_buffer->selective_display) ? -1 : 0);
- /* The omission of the clause
- && marker_position (XWINDOW (window)->start) == BEG
- here is deliberate; I think we want to measure from the prompt
- position even if the minibuffer window has scrolled. */
- int start_hpos = (EQ (window, minibuf_window) ? minibuf_prompt_width : 0);
-
- retry:
- if (vtarget > vpos)
+ 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);
+
+ /* 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)
{
- /* 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')
+ /* To move upward, go a line at a time until
+ we have gone at least far enough. */
+
+ first = 1;
+
+ while ((vpos > vtarget || first) && from > BEGV)
{
- XSETFASTINT (prevline, find_next_newline_no_quit (from, -1));
+ Lisp_Object propval;
+
+ 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 */
- || ! NILP (Fget_char_property (prevline,
- Qinvisible,
- window))
-#endif
- ))
+ || (propval = Fget_char_property (prevline,
+ Qinvisible,
+ text_prop_object),
+ TEXT_PROP_MEANS_INVISIBLE (propval))))
XSETFASTINT (prevline,
find_next_newline_no_quit (XFASTINT (prevline) - 1,
-1));
pos = *compute_motion (XFASTINT (prevline), 0,
- lmargin + (XFASTINT (prevline) == 1
+ lmargin + (XFASTINT (prevline) == BEG
? start_hpos : 0),
- from, 1 << (INTBITS - 2), 0,
- width, hscroll, 0, XWINDOW (window));
+ 0,
+ 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);
}
- else
+
+ /* If we made exactly the desired vertical distance,
+ or if we hit beginning of buffer,
+ return point found */
+ if (vpos >= vtarget)
{
- pos.hpos = lmargin + (from == 1 ? start_hpos : 0);
- pos.vpos = 0;
+ 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;
}
- return compute_motion (from, vpos, pos.hpos,
- ZV, vtarget, - (1 << (INTBITS - 2)),
- width, hscroll, pos.vpos * width,
- XWINDOW (window));
- }
- /* To move upward, go a line at a time until
- we have gone at least far enough */
-
- first = 1;
-
- while ((vpos > vtarget || first) && from > BEGV)
+ /* Otherwise find the correct spot by moving down */
+ }
+ /* Moving downward is simple, but must calculate from beg of line
+ to determine hpos of starting point */
+ from_byte = CHAR_TO_BYTE (from);
+ if (from > BEGV && FETCH_BYTE (from_byte - 1) != '\n')
{
- XSETFASTINT (prevline, from);
- while (1)
- {
- XSETFASTINT (prevline,
- find_next_newline_no_quit (XFASTINT (prevline) - 1,
- -1));
- if (XFASTINT (prevline) == BEGV
- || ((selective <= 0
- || ! indented_beyond_p (XFASTINT (prevline), selective))
-#ifdef USE_TEXT_PROPERTIES
- /* watch out for newlines with `invisible' property */
- && NILP (Fget_char_property (prevline, Qinvisible, window))
-#endif
- ))
- break;
- }
+ Lisp_Object propval;
+
+ XSETFASTINT (prevline, find_next_newline_no_quit (from, -1));
+ while (XFASTINT (prevline) > BEGV
+ && ((selective > 0
+ && indented_beyond_p (XFASTINT (prevline),
+ CHAR_TO_BYTE (XFASTINT (prevline)),
+ selective))
+ /* watch out for newlines with `invisible' property */
+ || (propval = Fget_char_property (prevline, Qinvisible,
+ text_prop_object),
+ TEXT_PROP_MEANS_INVISIBLE (propval))))
+ XSETFASTINT (prevline,
+ find_next_newline_no_quit (XFASTINT (prevline) - 1,
+ -1));
pos = *compute_motion (XFASTINT (prevline), 0,
- lmargin + (XFASTINT (prevline) == 1
+ lmargin + (XFASTINT (prevline) == BEG
? start_hpos : 0),
- from, 1 << (INTBITS - 2), 0,
- width, hscroll, 0, XWINDOW (window));
- vpos -= pos.vpos;
- first = 0;
- from = XFASTINT (prevline);
+ 0,
+ 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;
}
-
- /* If we made exactly the desired vertical distance,
- or if we hit beginning of buffer,
- return point found */
- if (vpos >= vtarget)
+ else
{
- val_vmotion.bufpos = from;
- val_vmotion.vpos = vpos;
- val_vmotion.hpos = lmargin;
- val_vmotion.contin = 0;
- val_vmotion.prevhpos = 0;
- return &val_vmotion;
+ pos.hpos = lmargin + (from == BEG ? start_hpos : 0);
+ pos.vpos = 0;
+ pos.tab_offset = 0;
+ did_motion = 0;
}
-
- /* Otherwise find the correct spot by moving down */
- goto retry;
+ return compute_motion (from, vpos, pos.hpos, did_motion,
+ 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;
- register struct window *w;
+ 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, XINT (lines), window_internal_width (w) - 1,
- /* Not XFASTINT since perhaps could be negative */
- XINT (w->hscroll), 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