| 1 | /* Indentation functions. |
| 2 | Copyright (C) 1985,86,87,88,93,94 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | |
| 21 | #include <config.h> |
| 22 | #include "lisp.h" |
| 23 | #include "buffer.h" |
| 24 | #include "indent.h" |
| 25 | #include "frame.h" |
| 26 | #include "window.h" |
| 27 | #include "termchar.h" |
| 28 | #include "termopts.h" |
| 29 | #include "disptab.h" |
| 30 | #include "intervals.h" |
| 31 | |
| 32 | /* Indentation can insert tabs if this is non-zero; |
| 33 | otherwise always uses spaces */ |
| 34 | int indent_tabs_mode; |
| 35 | |
| 36 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 37 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
| 38 | |
| 39 | #define CR 015 |
| 40 | |
| 41 | /* These three values memoize the current column to avoid recalculation */ |
| 42 | /* Some things in set last_known_column_point to -1 |
| 43 | to mark the memoized value as invalid */ |
| 44 | /* Last value returned by current_column */ |
| 45 | int last_known_column; |
| 46 | /* Value of point when current_column was called */ |
| 47 | int last_known_column_point; |
| 48 | /* Value of MODIFF when current_column was called */ |
| 49 | int last_known_column_modified; |
| 50 | |
| 51 | /* Get the display table to use for the current buffer. */ |
| 52 | |
| 53 | struct Lisp_Vector * |
| 54 | buffer_display_table () |
| 55 | { |
| 56 | Lisp_Object thisbuf; |
| 57 | |
| 58 | thisbuf = current_buffer->display_table; |
| 59 | if (XTYPE (thisbuf) == Lisp_Vector |
| 60 | && XVECTOR (thisbuf)->size == DISP_TABLE_SIZE) |
| 61 | return XVECTOR (thisbuf); |
| 62 | if (XTYPE (Vstandard_display_table) == Lisp_Vector |
| 63 | && XVECTOR (Vstandard_display_table)->size == DISP_TABLE_SIZE) |
| 64 | return XVECTOR (Vstandard_display_table); |
| 65 | return 0; |
| 66 | } |
| 67 | \f |
| 68 | DEFUN ("current-column", Fcurrent_column, Scurrent_column, 0, 0, 0, |
| 69 | "Return the horizontal position of point. Beginning of line is column 0.\n\ |
| 70 | This is calculated by adding together the widths of all the displayed\n\ |
| 71 | representations of the character between the start of the previous line\n\ |
| 72 | and point. (eg control characters will have a width of 2 or 4, tabs\n\ |
| 73 | will have a variable width)\n\ |
| 74 | Ignores finite width of frame, which means that this function may return\n\ |
| 75 | values greater than (frame-width).\n\ |
| 76 | Whether the line is visible (if `selective-display' is t) has no effect;\n\ |
| 77 | however, ^M is treated as end of line when `selective-display' is t.") |
| 78 | () |
| 79 | { |
| 80 | Lisp_Object temp; |
| 81 | XFASTINT (temp) = current_column (); |
| 82 | return temp; |
| 83 | } |
| 84 | |
| 85 | /* Cancel any recorded value of the horizontal position. */ |
| 86 | |
| 87 | invalidate_current_column () |
| 88 | { |
| 89 | last_known_column_point = 0; |
| 90 | } |
| 91 | |
| 92 | int |
| 93 | current_column () |
| 94 | { |
| 95 | register int col; |
| 96 | register unsigned char *ptr, *stop; |
| 97 | register int tab_seen; |
| 98 | int post_tab; |
| 99 | register int c; |
| 100 | register int tab_width = XINT (current_buffer->tab_width); |
| 101 | int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
| 102 | register struct Lisp_Vector *dp = buffer_display_table (); |
| 103 | int stopchar; |
| 104 | |
| 105 | if (point == last_known_column_point |
| 106 | && MODIFF == last_known_column_modified) |
| 107 | return last_known_column; |
| 108 | |
| 109 | /* Make a pointer for decrementing through the chars before point. */ |
| 110 | ptr = &FETCH_CHAR (point - 1) + 1; |
| 111 | /* Make a pointer to where consecutive chars leave off, |
| 112 | going backwards from point. */ |
| 113 | if (point == BEGV) |
| 114 | stop = ptr; |
| 115 | else if (point <= GPT || BEGV > GPT) |
| 116 | stop = BEGV_ADDR; |
| 117 | else |
| 118 | stop = GAP_END_ADDR; |
| 119 | |
| 120 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 121 | |
| 122 | col = 0, tab_seen = 0, post_tab = 0; |
| 123 | |
| 124 | while (1) |
| 125 | { |
| 126 | if (ptr == stop) |
| 127 | { |
| 128 | /* We stopped either for the beginning of the buffer |
| 129 | or for the gap. */ |
| 130 | if (ptr == BEGV_ADDR) |
| 131 | break; |
| 132 | /* It was the gap. Jump back over it. */ |
| 133 | stop = BEGV_ADDR; |
| 134 | ptr = GPT_ADDR; |
| 135 | /* Check whether that brings us to beginning of buffer. */ |
| 136 | if (BEGV >= GPT) break; |
| 137 | } |
| 138 | |
| 139 | c = *--ptr; |
| 140 | if (c >= 040 && c < 0177 |
| 141 | && (dp == 0 || XTYPE (DISP_CHAR_VECTOR (dp, c)) != Lisp_Vector)) |
| 142 | { |
| 143 | col++; |
| 144 | } |
| 145 | else if (c == '\n') |
| 146 | break; |
| 147 | else if (c == '\r' && EQ (current_buffer->selective_display, Qt)) |
| 148 | break; |
| 149 | else if (c == '\t') |
| 150 | { |
| 151 | if (tab_seen) |
| 152 | col = ((col + tab_width) / tab_width) * tab_width; |
| 153 | |
| 154 | post_tab += col; |
| 155 | col = 0; |
| 156 | tab_seen = 1; |
| 157 | } |
| 158 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
| 159 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; |
| 160 | else |
| 161 | col += (ctl_arrow && c < 0200) ? 2 : 4; |
| 162 | } |
| 163 | |
| 164 | if (tab_seen) |
| 165 | { |
| 166 | col = ((col + tab_width) / tab_width) * tab_width; |
| 167 | col += post_tab; |
| 168 | } |
| 169 | |
| 170 | last_known_column = col; |
| 171 | last_known_column_point = point; |
| 172 | last_known_column_modified = MODIFF; |
| 173 | |
| 174 | return col; |
| 175 | } |
| 176 | \f |
| 177 | |
| 178 | DEFUN ("indent-to", Findent_to, Sindent_to, 1, 2, "NIndent to column: ", |
| 179 | "Indent from point with tabs and spaces until COLUMN is reached.\n\ |
| 180 | Optional second argument MIN says always do at least MIN spaces\n\ |
| 181 | even if that goes past COLUMN; by default, MIN is zero.") |
| 182 | (col, minimum) |
| 183 | Lisp_Object col, minimum; |
| 184 | { |
| 185 | int mincol; |
| 186 | register int fromcol; |
| 187 | register int tab_width = XINT (current_buffer->tab_width); |
| 188 | |
| 189 | CHECK_NUMBER (col, 0); |
| 190 | if (NILP (minimum)) |
| 191 | XFASTINT (minimum) = 0; |
| 192 | CHECK_NUMBER (minimum, 1); |
| 193 | |
| 194 | fromcol = current_column (); |
| 195 | mincol = fromcol + XINT (minimum); |
| 196 | if (mincol < XINT (col)) mincol = XINT (col); |
| 197 | |
| 198 | if (fromcol == mincol) |
| 199 | return make_number (mincol); |
| 200 | |
| 201 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 202 | |
| 203 | if (indent_tabs_mode) |
| 204 | { |
| 205 | Lisp_Object n; |
| 206 | XFASTINT (n) = mincol / tab_width - fromcol / tab_width; |
| 207 | if (XFASTINT (n) != 0) |
| 208 | { |
| 209 | Finsert_char (make_number ('\t'), n); |
| 210 | |
| 211 | fromcol = (mincol / tab_width) * tab_width; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | XFASTINT (col) = mincol - fromcol; |
| 216 | Finsert_char (make_number (' '), col); |
| 217 | |
| 218 | last_known_column = mincol; |
| 219 | last_known_column_point = point; |
| 220 | last_known_column_modified = MODIFF; |
| 221 | |
| 222 | XSETINT (col, mincol); |
| 223 | return col; |
| 224 | } |
| 225 | \f |
| 226 | DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation, |
| 227 | 0, 0, 0, |
| 228 | "Return the indentation of the current line.\n\ |
| 229 | This is the horizontal position of the character\n\ |
| 230 | following any initial whitespace.") |
| 231 | () |
| 232 | { |
| 233 | Lisp_Object val; |
| 234 | |
| 235 | XFASTINT (val) = position_indentation (find_next_newline (point, -1)); |
| 236 | return val; |
| 237 | } |
| 238 | |
| 239 | position_indentation (pos) |
| 240 | register int pos; |
| 241 | { |
| 242 | register int column = 0; |
| 243 | register int tab_width = XINT (current_buffer->tab_width); |
| 244 | register unsigned char *p; |
| 245 | register unsigned char *stop; |
| 246 | |
| 247 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 248 | |
| 249 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; |
| 250 | p = &FETCH_CHAR (pos); |
| 251 | while (1) |
| 252 | { |
| 253 | while (p == stop) |
| 254 | { |
| 255 | if (pos == ZV) |
| 256 | return column; |
| 257 | pos += p - &FETCH_CHAR (pos); |
| 258 | p = &FETCH_CHAR (pos); |
| 259 | stop = &FETCH_CHAR (BUFFER_CEILING_OF (pos)) + 1; |
| 260 | } |
| 261 | switch (*p++) |
| 262 | { |
| 263 | case ' ': |
| 264 | column++; |
| 265 | break; |
| 266 | case '\t': |
| 267 | column += tab_width - column % tab_width; |
| 268 | break; |
| 269 | default: |
| 270 | return column; |
| 271 | } |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* Test whether the line beginning at POS is indented beyond COLUMN. |
| 276 | Blank lines are treated as if they had the same indentation as the |
| 277 | preceding line. */ |
| 278 | int |
| 279 | indented_beyond_p (pos, column) |
| 280 | int pos, column; |
| 281 | { |
| 282 | while (pos > BEGV && FETCH_CHAR (pos) == '\n') |
| 283 | pos = find_next_newline_no_quit (pos - 1, -1); |
| 284 | return (position_indentation (pos) >= column); |
| 285 | } |
| 286 | \f |
| 287 | DEFUN ("move-to-column", Fmove_to_column, Smove_to_column, 1, 2, 0, |
| 288 | "Move point to column COLUMN in the current line.\n\ |
| 289 | The column of a character is calculated by adding together the widths\n\ |
| 290 | as displayed of the previous characters in the line.\n\ |
| 291 | This function ignores line-continuation;\n\ |
| 292 | there is no upper limit on the column number a character can have\n\ |
| 293 | and horizontal scrolling has no effect.\n\ |
| 294 | \n\ |
| 295 | If specified column is within a character, point goes after that character.\n\ |
| 296 | If it's past end of line, point goes to end of line.\n\n\ |
| 297 | A non-nil second (optional) argument FORCE means, if the line\n\ |
| 298 | is too short to reach column COLUMN then add spaces/tabs to get there,\n\ |
| 299 | and if COLUMN is in the middle of a tab character, change it to spaces.") |
| 300 | (column, force) |
| 301 | Lisp_Object column, force; |
| 302 | { |
| 303 | register int pos; |
| 304 | register int col = current_column (); |
| 305 | register int goal; |
| 306 | register int end; |
| 307 | register int tab_width = XINT (current_buffer->tab_width); |
| 308 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
| 309 | register struct Lisp_Vector *dp = buffer_display_table (); |
| 310 | |
| 311 | Lisp_Object val; |
| 312 | int prev_col; |
| 313 | int c; |
| 314 | |
| 315 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 316 | CHECK_NATNUM (column, 0); |
| 317 | goal = XINT (column); |
| 318 | |
| 319 | retry: |
| 320 | pos = point; |
| 321 | end = ZV; |
| 322 | |
| 323 | /* If we're starting past the desired column, |
| 324 | back up to beginning of line and scan from there. */ |
| 325 | if (col > goal) |
| 326 | { |
| 327 | pos = find_next_newline (pos, -1); |
| 328 | col = 0; |
| 329 | } |
| 330 | |
| 331 | while (col < goal && pos < end) |
| 332 | { |
| 333 | c = FETCH_CHAR (pos); |
| 334 | if (c == '\n') |
| 335 | break; |
| 336 | if (c == '\r' && EQ (current_buffer->selective_display, Qt)) |
| 337 | break; |
| 338 | pos++; |
| 339 | if (c == '\t') |
| 340 | { |
| 341 | prev_col = col; |
| 342 | col += tab_width; |
| 343 | col = col / tab_width * tab_width; |
| 344 | } |
| 345 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
| 346 | col += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; |
| 347 | else if (ctl_arrow && (c < 040 || c == 0177)) |
| 348 | col += 2; |
| 349 | else if (c < 040 || c >= 0177) |
| 350 | col += 4; |
| 351 | else |
| 352 | col++; |
| 353 | } |
| 354 | |
| 355 | SET_PT (pos); |
| 356 | |
| 357 | /* If a tab char made us overshoot, change it to spaces |
| 358 | and scan through it again. */ |
| 359 | if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) |
| 360 | { |
| 361 | int old_point; |
| 362 | |
| 363 | del_range (point - 1, point); |
| 364 | Findent_to (make_number (goal), Qnil); |
| 365 | old_point = point; |
| 366 | Findent_to (make_number (col), Qnil); |
| 367 | SET_PT (old_point); |
| 368 | /* Set the last_known... vars consistently. */ |
| 369 | col = goal; |
| 370 | } |
| 371 | |
| 372 | /* If line ends prematurely, add space to the end. */ |
| 373 | if (col < goal && !NILP (force)) |
| 374 | Findent_to (make_number (col = goal), Qnil); |
| 375 | |
| 376 | last_known_column = col; |
| 377 | last_known_column_point = point; |
| 378 | last_known_column_modified = MODIFF; |
| 379 | |
| 380 | XFASTINT (val) = col; |
| 381 | return val; |
| 382 | } |
| 383 | \f |
| 384 | struct position val_compute_motion; |
| 385 | |
| 386 | /* Scan the current buffer forward from offset FROM, pretending that |
| 387 | this is at line FROMVPOS, column FROMHPOS, until reaching buffer |
| 388 | offset TO or line TOVPOS, column TOHPOS (whichever comes first), |
| 389 | and return the ending buffer position and screen location. |
| 390 | |
| 391 | WIDTH is the number of columns available to display text; |
| 392 | compute_motion uses this to handle continuation lines and such. |
| 393 | HSCROLL is the number of columns not being displayed at the left |
| 394 | margin; this is usually taken from a window's hscroll member. |
| 395 | TAB_OFFSET is the number of columns of the first tab that aren't |
| 396 | being displayed, perhaps because of a continuation line or |
| 397 | something. |
| 398 | |
| 399 | compute_motion returns a pointer to a struct position. The bufpos |
| 400 | member gives the buffer position at the end of the scan, and hpos |
| 401 | and vpos give its cartesian location. I'm not clear on what the |
| 402 | other members are. |
| 403 | |
| 404 | Note that FROMHPOS and TOHPOS should be expressed in real screen |
| 405 | columns, taking HSCROLL and the truncation glyph at the left margin |
| 406 | into account. That is, beginning-of-line moves you to the hpos |
| 407 | -HSCROLL + (HSCROLL > 0). |
| 408 | |
| 409 | For example, to find the buffer position of column COL of line LINE |
| 410 | of a certain window, pass the window's starting location as FROM |
| 411 | and the window's upper-left coordinates as FROMVPOS and FROMHPOS. |
| 412 | Pass the buffer's ZV as TO, to limit the scan to the end of the |
| 413 | visible section of the buffer, and pass LINE and COL as TOVPOS and |
| 414 | TOHPOS. |
| 415 | |
| 416 | When displaying in window w, a typical formula for WIDTH is: |
| 417 | |
| 418 | window_width - 1 |
| 419 | - (has_vertical_scroll_bars |
| 420 | ? VERTICAL_SCROLL_BAR_WIDTH |
| 421 | : (window_width + window_left != frame_width)) |
| 422 | |
| 423 | where |
| 424 | window_width is XFASTINT (w->width), |
| 425 | window_left is XFASTINT (w->left), |
| 426 | has_vertical_scroll_bars is |
| 427 | FRAME_HAS_VERTICAL_SCROLL_BARS (XFRAME (WINDOW_FRAME (window))) |
| 428 | and frame_width = FRAME_WIDTH (XFRAME (window->frame)) |
| 429 | |
| 430 | Or you can let window_internal_width do this all for you, and write: |
| 431 | window_internal_width (w) - 1 |
| 432 | |
| 433 | The `-1' accounts for the continuation-line backslashes; the rest |
| 434 | accounts for window borders if the window is split horizontally, and |
| 435 | the scroll bars if they are turned on. */ |
| 436 | |
| 437 | struct position * |
| 438 | compute_motion (from, fromvpos, fromhpos, to, tovpos, tohpos, width, hscroll, tab_offset, win) |
| 439 | int from, fromvpos, fromhpos, to, tovpos, tohpos; |
| 440 | register int width; |
| 441 | int hscroll, tab_offset; |
| 442 | struct window *win; |
| 443 | { |
| 444 | register int hpos = fromhpos; |
| 445 | register int vpos = fromvpos; |
| 446 | |
| 447 | register int pos; |
| 448 | register int c; |
| 449 | register int tab_width = XFASTINT (current_buffer->tab_width); |
| 450 | register int ctl_arrow = !NILP (current_buffer->ctl_arrow); |
| 451 | register struct Lisp_Vector *dp = window_display_table (win); |
| 452 | int selective |
| 453 | = (XTYPE (current_buffer->selective_display) == Lisp_Int |
| 454 | ? XINT (current_buffer->selective_display) |
| 455 | : !NILP (current_buffer->selective_display) ? -1 : 0); |
| 456 | int prev_vpos, prev_hpos = 0; |
| 457 | int selective_rlen |
| 458 | = (selective && dp && XTYPE (DISP_INVIS_VECTOR (dp)) == Lisp_Vector |
| 459 | ? XVECTOR (DISP_INVIS_VECTOR (dp))->size : 0); |
| 460 | #ifdef USE_TEXT_PROPERTIES |
| 461 | /* The next location where the `invisible' property changes */ |
| 462 | int next_invisible = from; |
| 463 | Lisp_Object prop, position; |
| 464 | #endif |
| 465 | |
| 466 | if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 467 | for (pos = from; pos < to; pos++) |
| 468 | { |
| 469 | /* Stop if past the target screen position. */ |
| 470 | if (vpos > tovpos |
| 471 | || (vpos == tovpos && hpos >= tohpos)) |
| 472 | break; |
| 473 | |
| 474 | prev_vpos = vpos; |
| 475 | prev_hpos = hpos; |
| 476 | |
| 477 | #ifdef USE_TEXT_PROPERTIES |
| 478 | /* if the `invisible' property is set, we can skip to |
| 479 | the next property change */ |
| 480 | while (pos == next_invisible && pos < to) |
| 481 | { |
| 482 | XFASTINT (position) = pos; |
| 483 | prop = Fget_char_property (position, |
| 484 | Qinvisible, |
| 485 | Fcurrent_buffer ()); |
| 486 | { |
| 487 | Lisp_Object end, limit; |
| 488 | |
| 489 | /* This is just an estimate to give reasonable |
| 490 | performance; nothing should go wrong if it is too small. */ |
| 491 | limit = Fnext_overlay_change (position); |
| 492 | if (XFASTINT (limit) > pos + 100) |
| 493 | XFASTINT (limit) = pos + 100; |
| 494 | end = Fnext_single_property_change (position, Qinvisible, |
| 495 | Fcurrent_buffer (), limit); |
| 496 | if (INTEGERP (end)) |
| 497 | next_invisible = XINT (end); |
| 498 | else |
| 499 | next_invisible = to; |
| 500 | if (! NILP (prop)) |
| 501 | pos = next_invisible; |
| 502 | } |
| 503 | } |
| 504 | if (pos >= to) |
| 505 | break; |
| 506 | #endif |
| 507 | c = FETCH_CHAR (pos); |
| 508 | if (c >= 040 && c < 0177 |
| 509 | && (dp == 0 || XTYPE (DISP_CHAR_VECTOR (dp, c)) != Lisp_Vector)) |
| 510 | hpos++; |
| 511 | else if (c == '\t') |
| 512 | { |
| 513 | hpos += tab_width - ((hpos + tab_offset + hscroll - (hscroll > 0) |
| 514 | /* Add tab_width here to make sure positive. |
| 515 | hpos can be negative after continuation |
| 516 | but can't be less than -tab_width. */ |
| 517 | + tab_width) |
| 518 | % tab_width); |
| 519 | } |
| 520 | else if (c == '\n') |
| 521 | { |
| 522 | if (selective > 0 && indented_beyond_p (pos + 1, selective)) |
| 523 | { |
| 524 | /* Skip any number of invisible lines all at once */ |
| 525 | do |
| 526 | { |
| 527 | while (++pos < to && FETCH_CHAR (pos) != '\n'); |
| 528 | } |
| 529 | while (pos < to && indented_beyond_p (pos + 1, selective)); |
| 530 | pos--; /* Reread the newline on the next pass. */ |
| 531 | /* Allow for the " ..." that is displayed for them. */ |
| 532 | if (selective_rlen) |
| 533 | { |
| 534 | hpos += selective_rlen; |
| 535 | if (hpos >= width) |
| 536 | hpos = width; |
| 537 | } |
| 538 | /* We have skipped the invis text, but not the newline after. */ |
| 539 | } |
| 540 | else |
| 541 | { |
| 542 | /* A visible line. */ |
| 543 | vpos++; |
| 544 | hpos = 0; |
| 545 | hpos -= hscroll; |
| 546 | if (hscroll > 0) hpos++; /* Truncation glyph on column 0 */ |
| 547 | tab_offset = 0; |
| 548 | } |
| 549 | } |
| 550 | else if (c == CR && selective < 0) |
| 551 | { |
| 552 | /* In selective display mode, |
| 553 | everything from a ^M to the end of the line is invisible */ |
| 554 | while (pos < to && FETCH_CHAR (pos) != '\n') pos++; |
| 555 | /* Stop *before* the real newline. */ |
| 556 | pos--; |
| 557 | /* Allow for the " ..." that is displayed for them. */ |
| 558 | if (selective_rlen) |
| 559 | { |
| 560 | hpos += selective_rlen; |
| 561 | if (hpos >= width) |
| 562 | hpos = width; |
| 563 | } |
| 564 | } |
| 565 | else if (dp != 0 && XTYPE (DISP_CHAR_VECTOR (dp, c)) == Lisp_Vector) |
| 566 | hpos += XVECTOR (DISP_CHAR_VECTOR (dp, c))->size; |
| 567 | else |
| 568 | hpos += (ctl_arrow && c < 0200) ? 2 : 4; |
| 569 | |
| 570 | /* Handle right margin. */ |
| 571 | if (hpos >= width |
| 572 | && (hpos > width |
| 573 | || (pos < ZV - 1 |
| 574 | && FETCH_CHAR (pos + 1) != '\n'))) |
| 575 | { |
| 576 | if (vpos > tovpos |
| 577 | || (vpos == tovpos && hpos >= tohpos)) |
| 578 | break; |
| 579 | if (hscroll |
| 580 | || (truncate_partial_width_windows |
| 581 | && width + 1 < FRAME_WIDTH (selected_frame)) |
| 582 | || !NILP (current_buffer->truncate_lines)) |
| 583 | { |
| 584 | /* Truncating: skip to newline. */ |
| 585 | while (pos < to && FETCH_CHAR (pos) != '\n') pos++; |
| 586 | pos--; |
| 587 | hpos = width; |
| 588 | } |
| 589 | else |
| 590 | { |
| 591 | /* Continuing. */ |
| 592 | vpos++; |
| 593 | hpos -= width; |
| 594 | tab_offset += width; |
| 595 | } |
| 596 | |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | val_compute_motion.bufpos = pos; |
| 601 | val_compute_motion.hpos = hpos; |
| 602 | val_compute_motion.vpos = vpos; |
| 603 | val_compute_motion.prevhpos = prev_hpos; |
| 604 | |
| 605 | /* Nonzero if have just continued a line */ |
| 606 | val_compute_motion.contin |
| 607 | = (pos != from |
| 608 | && (val_compute_motion.vpos != prev_vpos) |
| 609 | && c != '\n'); |
| 610 | |
| 611 | return &val_compute_motion; |
| 612 | } |
| 613 | |
| 614 | #if 0 /* The doc string is too long for some compilers, |
| 615 | but make-docfile can find it in this comment. */ |
| 616 | DEFUN ("compute-motion", Ffoo, Sfoo, 7, 7, 0, |
| 617 | "Scan through the current buffer, calculating screen position.\n\ |
| 618 | Scan the current buffer forward from offset FROM,\n\ |
| 619 | assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)--\n\ |
| 620 | to position TO or position TOPOS--another cons of the form (HPOS . VPOS)--\n\ |
| 621 | and return the ending buffer position and screen location.\n\ |
| 622 | \n\ |
| 623 | There are three additional arguments:\n\ |
| 624 | \n\ |
| 625 | WIDTH is the number of columns available to display text;\n\ |
| 626 | this affects handling of continuation lines.\n\ |
| 627 | This is usually the value returned by `window-width', less one (to allow\n\ |
| 628 | for the continuation glyph).\n\ |
| 629 | \n\ |
| 630 | OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET).\n\ |
| 631 | HSCROLL is the number of columns not being displayed at the left\n\ |
| 632 | margin; this is usually taken from a window's hscroll member.\n\ |
| 633 | TAB-OFFSET is the number of columns of the first tab that aren't\n\ |
| 634 | being displayed, perhaps because the line was continued within it.\n\ |
| 635 | If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero.\n\ |
| 636 | \n\ |
| 637 | WINDOW is the window to operate on. Currently this is used only to\n\ |
| 638 | find the display table. It does not matter what buffer WINDOW displays;\n\ |
| 639 | `compute-motion' always operates on the current buffer.\n\ |
| 640 | \n\ |
| 641 | The value is a list of five elements:\n\ |
| 642 | (POS HPOS VPOS PREVHPOS CONTIN)\n\ |
| 643 | POS is the buffer position where the scan stopped.\n\ |
| 644 | VPOS is the vertical position where the scan stopped.\n\ |
| 645 | HPOS is the horizontal position where the scan stopped.\n\ |
| 646 | \n\ |
| 647 | PREVHPOS is the horizontal position one character back from POS.\n\ |
| 648 | CONTIN is t if a line was continued after (or within) the previous character.\n\ |
| 649 | \n\ |
| 650 | For example, to find the buffer position of column COL of line LINE\n\ |
| 651 | of a certain window, pass the window's starting location as FROM\n\ |
| 652 | and the window's upper-left coordinates as FROMPOS.\n\ |
| 653 | Pass the buffer's (point-max) as TO, to limit the scan to the end of the\n\ |
| 654 | visible section of the buffer, and pass LINE and COL as TOPOS.") |
| 655 | (from, frompos, to, topos, width, offsets, window) |
| 656 | #endif |
| 657 | |
| 658 | DEFUN ("compute-motion", Fcompute_motion, Scompute_motion, 7, 7, 0, |
| 659 | 0) |
| 660 | (from, frompos, to, topos, width, offsets, window) |
| 661 | Lisp_Object from, frompos, to, topos; |
| 662 | Lisp_Object width, offsets, window; |
| 663 | { |
| 664 | Lisp_Object bufpos, hpos, vpos, prevhpos, contin; |
| 665 | struct position *pos; |
| 666 | int hscroll, tab_offset; |
| 667 | |
| 668 | CHECK_NUMBER_COERCE_MARKER (from, 0); |
| 669 | CHECK_CONS (frompos, 0); |
| 670 | CHECK_NUMBER (XCONS (frompos)->car, 0); |
| 671 | CHECK_NUMBER (XCONS (frompos)->cdr, 0); |
| 672 | CHECK_NUMBER_COERCE_MARKER (to, 0); |
| 673 | CHECK_CONS (topos, 0); |
| 674 | CHECK_NUMBER (XCONS (topos)->car, 0); |
| 675 | CHECK_NUMBER (XCONS (topos)->cdr, 0); |
| 676 | CHECK_NUMBER (width, 0); |
| 677 | if (!NILP (offsets)) |
| 678 | { |
| 679 | CHECK_CONS (offsets, 0); |
| 680 | CHECK_NUMBER (XCONS (offsets)->car, 0); |
| 681 | CHECK_NUMBER (XCONS (offsets)->cdr, 0); |
| 682 | hscroll = XINT (XCONS (offsets)->car); |
| 683 | tab_offset = XINT (XCONS (offsets)->cdr); |
| 684 | } |
| 685 | else |
| 686 | hscroll = tab_offset = 0; |
| 687 | |
| 688 | if (NILP (window)) |
| 689 | window = Fselected_window (); |
| 690 | else |
| 691 | CHECK_LIVE_WINDOW (window, 0); |
| 692 | |
| 693 | pos = compute_motion (XINT (from), XINT (XCONS (frompos)->cdr), |
| 694 | XINT (XCONS (frompos)->car), |
| 695 | XINT (to), XINT (XCONS (topos)->cdr), |
| 696 | XINT (XCONS (topos)->car), |
| 697 | XINT (width), hscroll, tab_offset, |
| 698 | XWINDOW (window)); |
| 699 | |
| 700 | XFASTINT (bufpos) = pos->bufpos; |
| 701 | XSET (hpos, Lisp_Int, pos->hpos); |
| 702 | XSET (vpos, Lisp_Int, pos->vpos); |
| 703 | XSET (prevhpos, Lisp_Int, pos->prevhpos); |
| 704 | |
| 705 | return Fcons (bufpos, |
| 706 | Fcons (hpos, |
| 707 | Fcons (vpos, |
| 708 | Fcons (prevhpos, |
| 709 | Fcons (pos->contin ? Qt : Qnil, Qnil))))); |
| 710 | |
| 711 | } |
| 712 | \f |
| 713 | /* Return the column of position POS in window W's buffer, |
| 714 | rounded down to a multiple of the internal width of W. |
| 715 | This is the amount of indentation of position POS |
| 716 | that is not visible in its horizontal position in the window. */ |
| 717 | |
| 718 | int |
| 719 | pos_tab_offset (w, pos) |
| 720 | struct window *w; |
| 721 | register int pos; |
| 722 | { |
| 723 | int opoint = point; |
| 724 | int col; |
| 725 | int width = window_internal_width (w) - 1; |
| 726 | |
| 727 | if (pos == BEGV || FETCH_CHAR (pos - 1) == '\n') |
| 728 | return 0; |
| 729 | SET_PT (pos); |
| 730 | col = current_column (); |
| 731 | SET_PT (opoint); |
| 732 | return col - (col % width); |
| 733 | } |
| 734 | |
| 735 | /* start_hpos is the hpos of the first character of the buffer: |
| 736 | zero except for the minibuffer window, |
| 737 | where it is the width of the prompt. */ |
| 738 | |
| 739 | struct position val_vmotion; |
| 740 | |
| 741 | struct position * |
| 742 | vmotion (from, vtarget, width, hscroll, window) |
| 743 | register int from, vtarget, width; |
| 744 | int hscroll; |
| 745 | Lisp_Object window; |
| 746 | { |
| 747 | struct position pos; |
| 748 | /* vpos is cumulative vertical position, changed as from is changed */ |
| 749 | register int vpos = 0; |
| 750 | register int prevline; |
| 751 | register int first; |
| 752 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; |
| 753 | int selective |
| 754 | = XTYPE (current_buffer->selective_display) == Lisp_Int |
| 755 | ? XINT (current_buffer->selective_display) |
| 756 | : !NILP (current_buffer->selective_display) ? -1 : 0; |
| 757 | /* The omission of the clause |
| 758 | && marker_position (XWINDOW (window)->start) == BEG |
| 759 | here is deliberate; I think we want to measure from the prompt |
| 760 | position even if the minibuffer window has scrolled. */ |
| 761 | int start_hpos = (EQ (window, minibuf_window) ? minibuf_prompt_width : 0); |
| 762 | |
| 763 | retry: |
| 764 | if (vtarget > vpos) |
| 765 | { |
| 766 | /* Moving downward is simple, but must calculate from beg of line |
| 767 | to determine hpos of starting point */ |
| 768 | if (from > BEGV && FETCH_CHAR (from - 1) != '\n') |
| 769 | { |
| 770 | prevline = find_next_newline_no_quit (from, -1); |
| 771 | while (prevline > BEGV |
| 772 | && ((selective > 0 |
| 773 | && indented_beyond_p (prevline, selective)) |
| 774 | #ifdef USE_TEXT_PROPERTIES |
| 775 | /* watch out for newlines with `invisible' property */ |
| 776 | || ! NILP (Fget_char_property (XFASTINT (prevline), |
| 777 | Qinvisible, |
| 778 | window)) |
| 779 | #endif |
| 780 | )) |
| 781 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
| 782 | pos = *compute_motion (prevline, 0, |
| 783 | lmargin + (prevline == 1 ? start_hpos : 0), |
| 784 | from, 1 << (INTBITS - 2), 0, |
| 785 | width, hscroll, 0, XWINDOW (window)); |
| 786 | } |
| 787 | else |
| 788 | { |
| 789 | pos.hpos = lmargin + (from == 1 ? start_hpos : 0); |
| 790 | pos.vpos = 0; |
| 791 | } |
| 792 | return compute_motion (from, vpos, pos.hpos, |
| 793 | ZV, vtarget, - (1 << (INTBITS - 2)), |
| 794 | width, hscroll, pos.vpos * width, |
| 795 | XWINDOW (window)); |
| 796 | } |
| 797 | |
| 798 | /* To move upward, go a line at a time until |
| 799 | we have gone at least far enough */ |
| 800 | |
| 801 | first = 1; |
| 802 | |
| 803 | while ((vpos > vtarget || first) && from > BEGV) |
| 804 | { |
| 805 | prevline = from; |
| 806 | while (1) |
| 807 | { |
| 808 | prevline = find_next_newline_no_quit (prevline - 1, -1); |
| 809 | if (prevline == BEGV |
| 810 | || ((selective <= 0 |
| 811 | || ! indented_beyond_p (prevline, selective)) |
| 812 | #ifdef USE_TEXT_PROPERTIES |
| 813 | /* watch out for newlines with `invisible' property */ |
| 814 | && NILP (Fget_char_property (XFASTINT (prevline), |
| 815 | Qinvisible, |
| 816 | window)) |
| 817 | #endif |
| 818 | )) |
| 819 | break; |
| 820 | } |
| 821 | pos = *compute_motion (prevline, 0, |
| 822 | lmargin + (prevline == 1 ? start_hpos : 0), |
| 823 | from, 1 << (INTBITS - 2), 0, |
| 824 | width, hscroll, 0, XWINDOW (window)); |
| 825 | vpos -= pos.vpos; |
| 826 | first = 0; |
| 827 | from = prevline; |
| 828 | } |
| 829 | |
| 830 | /* If we made exactly the desired vertical distance, |
| 831 | or if we hit beginning of buffer, |
| 832 | return point found */ |
| 833 | if (vpos >= vtarget) |
| 834 | { |
| 835 | val_vmotion.bufpos = from; |
| 836 | val_vmotion.vpos = vpos; |
| 837 | val_vmotion.hpos = lmargin; |
| 838 | val_vmotion.contin = 0; |
| 839 | val_vmotion.prevhpos = 0; |
| 840 | return &val_vmotion; |
| 841 | } |
| 842 | |
| 843 | /* Otherwise find the correct spot by moving down */ |
| 844 | goto retry; |
| 845 | } |
| 846 | |
| 847 | DEFUN ("vertical-motion", Fvertical_motion, Svertical_motion, 1, 2, 0, |
| 848 | "Move to start of screen line LINES lines down.\n\ |
| 849 | If LINES is negative, this is moving up.\n\ |
| 850 | \n\ |
| 851 | The optional second argument WINDOW specifies the window to use for\n\ |
| 852 | parameters such as width, horizontal scrolling, and so on.\n\ |
| 853 | the default is the selected window.\n\ |
| 854 | It does not matter what buffer is displayed in WINDOW.\n\ |
| 855 | `vertical-motion' always uses the current buffer.\n\ |
| 856 | \n\ |
| 857 | Sets point to position found; this may be start of line\n\ |
| 858 | or just the start of a continuation line.\n\ |
| 859 | Returns number of lines moved; may be closer to zero than LINES\n\ |
| 860 | if beginning or end of buffer was reached.") |
| 861 | (lines, window) |
| 862 | Lisp_Object lines, window; |
| 863 | { |
| 864 | struct position pos; |
| 865 | register struct window *w; |
| 866 | |
| 867 | CHECK_NUMBER (lines, 0); |
| 868 | if (! NILP (window)) |
| 869 | CHECK_WINDOW (window, 0); |
| 870 | else |
| 871 | XSET (window, Lisp_Window, selected_window); |
| 872 | |
| 873 | w = XWINDOW (window); |
| 874 | |
| 875 | pos = *vmotion (point, XINT (lines), window_internal_width (w) - 1, |
| 876 | /* Not XFASTINT since perhaps could be negative */ |
| 877 | XINT (w->hscroll), window); |
| 878 | |
| 879 | SET_PT (pos.bufpos); |
| 880 | return make_number (pos.vpos); |
| 881 | } |
| 882 | \f |
| 883 | syms_of_indent () |
| 884 | { |
| 885 | DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode, |
| 886 | "*Indentation can insert tabs if this is non-nil.\n\ |
| 887 | Setting this variable automatically makes it local to the current buffer."); |
| 888 | indent_tabs_mode = 1; |
| 889 | |
| 890 | defsubr (&Scurrent_indentation); |
| 891 | defsubr (&Sindent_to); |
| 892 | defsubr (&Scurrent_column); |
| 893 | defsubr (&Smove_to_column); |
| 894 | defsubr (&Svertical_motion); |
| 895 | defsubr (&Scompute_motion); |
| 896 | } |