Mercurial > hg > xemacs-beta
annotate src/indent.c @ 5273:799742b751c8
Accept circular lists where that is useful in #'mapcar*, #'map* and friends.
src/ChangeLog addition:
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* fns.c (Flist_length): New, moved here from cl-extra.el, needed
by the next function.
(shortest_length_among_sequences): New.
(Fmapconcat, FmapcarX, Fmapvector, Fmapcan, Fmapc, Fmap)
(Fmap_into, Fsome, Fevery):
Use shortest_length_among_sequences() when working out how many
iterations to do, only giving circular list errors if all
arguments are circular.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Thu, 16 Sep 2010 20:34:49 +0100 |
| parents | 07dcc7000bbf |
| children | c096d8051f89 308d34e9f07d |
| rev | line source |
|---|---|
| 428 | 1 /* Indentation functions. |
| 2 Copyright (C) 1995 Board of Trustees, University of Illinois. | |
| 3 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995 | |
| 826 | 4 Free Software Foundation, Inc. |
| 3025 | 5 Copyright (C) 2002, 2005 Ben Wing. |
| 428 | 6 |
| 7 This file is part of XEmacs. | |
| 8 | |
| 9 XEmacs is free software; you can redistribute it and/or modify it | |
| 10 under the terms of the GNU General Public License as published by the | |
| 11 Free Software Foundation; either version 2, or (at your option) any | |
| 12 later version. | |
| 13 | |
| 14 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 17 for more details. | |
| 18 | |
| 19 You should have received a copy of the GNU General Public License | |
| 20 along with XEmacs; see the file COPYING. If not, write to | |
| 21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 22 Boston, MA 02111-1307, USA. */ | |
| 23 | |
| 24 /* This file has been Mule-ized. */ | |
| 25 | |
| 26 /* Synched up with: 19.30. Diverges significantly from FSF. */ | |
| 27 | |
| 28 | |
| 29 #include <config.h> | |
| 30 #include "lisp.h" | |
| 31 | |
| 32 #include "buffer.h" | |
| 33 #include "device.h" | |
| 34 #include "extents.h" | |
| 35 #include "faces.h" | |
| 36 #include "frame.h" | |
| 37 #include "glyphs.h" | |
| 38 #include "insdel.h" | |
| 39 #ifdef REGION_CACHE_NEEDS_WORK | |
| 40 #include "region-cache.h" | |
| 41 #endif | |
| 42 #include "window.h" | |
| 43 | |
| 44 /* Indentation can insert tabs if this is non-zero; | |
| 45 otherwise always uses spaces */ | |
| 46 int indent_tabs_mode; | |
| 47 | |
| 48 /* Avoid recalculation by remembering things in these variables. */ | |
| 49 | |
| 50 /* Last value returned by current_column. | |
| 51 | |
| 52 Some things set last_known_column_point to -1 | |
| 53 to mark the memoized value as invalid */ | |
| 54 static int last_known_column; | |
| 55 | |
| 56 /* Last buffer searched by current_column */ | |
| 57 static struct buffer *last_known_column_buffer; | |
| 58 | |
| 59 /* Value of point when current_column was called */ | |
| 665 | 60 static Charbpos last_known_column_point; |
| 428 | 61 |
| 62 /* Value of MODIFF when current_column was called */ | |
| 63 static int last_known_column_modified; | |
| 64 | |
| 665 | 65 static Charbpos |
| 66 last_visible_position (Charbpos pos, struct buffer *buf) | |
| 428 | 67 { |
| 68 Lisp_Object buffer; | |
| 69 Lisp_Object value; | |
| 70 | |
| 793 | 71 buffer = wrap_buffer (buf); |
| 2506 | 72 value = Fprevious_single_char_property_change (make_int (pos), Qinvisible, |
| 73 buffer, Qnil); | |
| 428 | 74 if (NILP (value)) |
| 75 return 0; /* no visible position found */ | |
| 76 else | |
| 77 /* #### bug bug bug!!! This will return the position of the beginning | |
| 78 of an invisible extent; this extent is very likely to be start-closed, | |
| 79 and thus the spaces inserted in `indent-to' will go inside the | |
| 80 invisible extent. | |
| 81 | |
| 82 Not sure what the correct solution is here. Rethink indent-to? */ | |
| 83 return XINT (value); | |
| 84 } | |
| 85 | |
| 86 #ifdef REGION_CACHE_NEEDS_WORK | |
| 87 | |
| 88 /* Allocate or free the width run cache, as requested by the current | |
| 89 state of current_buffer's cache_long_line_scans variable. */ | |
| 90 static void | |
| 91 width_run_cache_on_off (struct buffer *buf) | |
| 92 { | |
| 93 if (NILP (buf->cache_long_line_scans)) | |
| 94 { | |
| 95 /* It should be off. */ | |
| 96 if (buf->width_run_cache) | |
| 97 { | |
| 98 free_region_cache (buf->width_run_cache); | |
| 99 buf->width_run_cache = 0; | |
| 100 buf->width_table = Qnil; | |
| 101 } | |
| 102 } | |
| 103 else | |
| 104 { | |
| 105 /* It should be on. */ | |
| 106 if (buf->width_run_cache == 0) | |
| 107 { | |
| 108 buf->width_run_cache = new_region_cache (); | |
| 109 recompute_width_table (buf, buffer_display_table ()); | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 #endif /* REGION_CACHE_NEEDS_WORK */ | |
| 115 | |
| 116 | |
| 117 /* Cancel any recorded value of the horizontal position. */ | |
| 118 | |
| 119 void | |
| 120 invalidate_current_column (void) | |
| 121 { | |
| 122 last_known_column_point = -1; | |
| 123 } | |
| 124 | |
| 125 int | |
| 665 | 126 column_at_point (struct buffer *buf, Charbpos init_pos, int cur_col) |
| 428 | 127 { |
| 128 int col; | |
| 129 int tab_seen; | |
| 130 int tab_width = XINT (buf->tab_width); | |
| 131 int post_tab; | |
| 665 | 132 Charbpos pos = init_pos; |
| 867 | 133 Ichar c; |
| 428 | 134 |
| 135 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 136 col = tab_seen = post_tab = 0; | |
| 137 | |
| 138 while (1) | |
| 139 { | |
| 140 if (pos <= BUF_BEGV (buf)) | |
| 141 break; | |
| 142 | |
| 143 pos--; | |
| 144 c = BUF_FETCH_CHAR (buf, pos); | |
| 145 if (c == '\t') | |
| 146 { | |
| 147 if (tab_seen) | |
| 148 col = ((col + tab_width) / tab_width) * tab_width; | |
| 149 | |
| 150 post_tab += col; | |
| 151 col = 0; | |
| 152 tab_seen = 1; | |
| 153 } | |
| 154 else if (c == '\n' || | |
| 155 (EQ (buf->selective_display, Qt) && c == '\r')) | |
| 156 break; | |
| 157 else | |
| 158 { | |
| 159 /* #### This needs updating to handle the new redisplay. */ | |
| 160 /* #### FSFmacs looks at ctl_arrow, display tables. | |
| 161 We need to do similar. */ | |
| 162 #if 0 | |
| 665 | 163 displayed_glyphs = glyphs_from_charbpos (sel_frame, buf, |
| 428 | 164 XWINDOW (selected_window), |
| 165 pos, dp, 0, col, 0, 0, 0); | |
| 166 col += (displayed_glyphs->columns | |
| 167 - (displayed_glyphs->begin_columns | |
| 168 + displayed_glyphs->end_columns)); | |
| 169 #else /* XEmacs */ | |
| 170 #ifdef MULE | |
| 867 | 171 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 172 #else |
| 173 col ++; | |
| 174 #endif /* MULE */ | |
| 175 #endif /* XEmacs */ | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 if (tab_seen) | |
| 180 { | |
| 181 col = ((col + tab_width) / tab_width) * tab_width; | |
| 182 col += post_tab; | |
| 183 } | |
| 184 | |
| 185 if (cur_col) | |
| 186 { | |
| 187 last_known_column_buffer = buf; | |
| 188 last_known_column = col; | |
| 189 last_known_column_point = init_pos; | |
| 190 last_known_column_modified = BUF_MODIFF (buf); | |
| 191 } | |
| 192 | |
| 193 return col; | |
| 194 } | |
| 195 | |
| 196 int | |
| 793 | 197 string_column_at_point (Lisp_Object s, Charbpos init_pos, int tab_width) |
| 428 | 198 { |
| 199 int col; | |
| 200 int tab_seen; | |
| 201 int post_tab; | |
| 665 | 202 Charbpos pos = init_pos; |
| 867 | 203 Ichar c; |
| 428 | 204 |
| 205 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 206 col = tab_seen = post_tab = 0; | |
| 207 | |
| 208 while (1) | |
| 209 { | |
| 210 if (pos <= 0) | |
| 211 break; | |
| 212 | |
| 213 pos--; | |
| 867 | 214 c = string_ichar (s, pos); |
| 428 | 215 if (c == '\t') |
| 216 { | |
| 217 if (tab_seen) | |
| 218 col = ((col + tab_width) / tab_width) * tab_width; | |
| 219 | |
| 220 post_tab += col; | |
| 221 col = 0; | |
| 222 tab_seen = 1; | |
| 223 } | |
| 224 else if (c == '\n') | |
| 225 break; | |
| 226 else | |
| 227 #ifdef MULE | |
| 867 | 228 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 229 #else |
| 230 col ++; | |
| 231 #endif /* MULE */ | |
| 232 } | |
| 233 | |
| 234 if (tab_seen) | |
| 235 { | |
| 236 col = ((col + tab_width) / tab_width) * tab_width; | |
| 237 col += post_tab; | |
| 238 } | |
| 239 | |
| 240 return col; | |
| 241 } | |
| 242 | |
| 243 int | |
| 244 current_column (struct buffer *buf) | |
| 245 { | |
| 246 if (buf == last_known_column_buffer | |
| 247 && BUF_PT (buf) == last_known_column_point | |
| 248 && BUF_MODIFF (buf) == last_known_column_modified) | |
| 249 return last_known_column; | |
| 250 | |
| 251 return column_at_point (buf, BUF_PT (buf), 1); | |
| 252 } | |
| 253 | |
| 254 DEFUN ("current-column", Fcurrent_column, 0, 1, 0, /* | |
| 255 Return the horizontal position of point. Beginning of line is column 0. | |
| 256 This is calculated by adding together the widths of all the displayed | |
| 257 representations of the character between the start of the previous line | |
| 258 and point. (e.g. control characters will have a width of 2 or 4, tabs | |
| 259 will have a variable width.) | |
| 260 Ignores finite width of frame, which means that this function may return | |
| 261 values greater than (frame-width). | |
| 262 Whether the line is visible (if `selective-display' is t) has no effect; | |
| 263 however, ^M is treated as end of line when `selective-display' is t. | |
| 264 If BUFFER is nil, the current buffer is assumed. | |
| 265 */ | |
| 266 (buffer)) | |
| 267 { | |
| 268 return make_int (current_column (decode_buffer (buffer, 0))); | |
| 269 } | |
| 270 | |
| 271 | |
| 272 DEFUN ("indent-to", Findent_to, 1, 3, "NIndent to column: ", /* | |
| 273 Indent from point with tabs and spaces until COLUMN is reached. | |
| 444 | 274 Optional second argument MINIMUM says always do at least MINIMUM spaces |
| 275 even if that goes past COLUMN; by default, MINIMUM is zero. | |
| 428 | 276 If BUFFER is nil, the current buffer is assumed. |
| 277 */ | |
| 444 | 278 (column, minimum, buffer)) |
| 428 | 279 { |
| 280 /* This function can GC */ | |
| 281 int mincol; | |
| 282 int fromcol; | |
| 283 struct buffer *buf = decode_buffer (buffer, 0); | |
| 284 int tab_width = XINT (buf->tab_width); | |
| 665 | 285 Charbpos opoint = 0; |
| 428 | 286 |
| 444 | 287 CHECK_INT (column); |
| 428 | 288 if (NILP (minimum)) |
| 289 minimum = Qzero; | |
| 290 else | |
| 291 CHECK_INT (minimum); | |
| 292 | |
| 793 | 293 buffer = wrap_buffer (buf); |
| 428 | 294 |
| 295 fromcol = current_column (buf); | |
| 296 mincol = fromcol + XINT (minimum); | |
| 444 | 297 if (mincol < XINT (column)) mincol = XINT (column); |
| 428 | 298 |
| 299 if (fromcol == mincol) | |
| 300 return make_int (mincol); | |
| 301 | |
| 302 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 303 | |
| 304 if (!NILP (Fextent_at (make_int (BUF_PT (buf)), buffer, Qinvisible, | |
| 305 Qnil, Qnil))) | |
| 306 { | |
| 665 | 307 Charbpos last_visible = last_visible_position (BUF_PT (buf), buf); |
| 428 | 308 |
| 309 opoint = BUF_PT (buf); | |
| 310 if (last_visible >= BUF_BEGV (buf)) | |
| 311 BUF_SET_PT (buf, last_visible); | |
| 312 else | |
| 563 | 313 invalid_operation ("Visible portion of buffer not modifiable", Qunbound); |
| 428 | 314 } |
| 315 | |
| 316 if (indent_tabs_mode) | |
| 317 { | |
| 318 int n = mincol / tab_width - fromcol / tab_width; | |
| 319 if (n != 0) | |
| 320 { | |
| 321 Finsert_char (make_char ('\t'), make_int (n), Qnil, buffer); | |
| 322 | |
| 323 fromcol = (mincol / tab_width) * tab_width; | |
| 324 } | |
| 325 } | |
| 326 | |
| 327 Finsert_char (make_char (' '), make_int (mincol - fromcol), Qnil, buffer); | |
| 328 | |
| 329 last_known_column_buffer = buf; | |
| 330 last_known_column = mincol; | |
| 331 last_known_column_point = BUF_PT (buf); | |
| 332 last_known_column_modified = BUF_MODIFF (buf); | |
| 333 | |
| 334 /* Not in FSF: */ | |
| 335 if (opoint > 0) | |
| 336 BUF_SET_PT (buf, opoint); | |
| 337 | |
| 338 return make_int (mincol); | |
| 339 } | |
| 340 | |
| 341 int | |
| 826 | 342 byte_spaces_at_point (struct buffer *b, Bytebpos byte_pos) |
| 428 | 343 { |
| 826 | 344 Bytebpos byte_end = BYTE_BUF_ZV (b); |
| 428 | 345 int col = 0; |
| 867 | 346 Ichar c; |
| 428 | 347 int tab_width = XINT (b->tab_width); |
| 348 | |
| 349 if (tab_width <= 0 || tab_width > 1000) | |
| 350 tab_width = 8; | |
| 351 | |
| 826 | 352 while (byte_pos < byte_end && |
| 353 (c = BYTE_BUF_FETCH_CHAR (b, byte_pos), | |
| 428 | 354 (c == '\t' |
| 355 ? (col += tab_width - col % tab_width) | |
| 356 : (c == ' ' ? ++col : 0)))) | |
| 826 | 357 INC_BYTEBPOS (b, byte_pos); |
| 428 | 358 |
| 359 return col; | |
| 360 } | |
| 361 | |
| 362 | |
| 363 DEFUN ("current-indentation", Fcurrent_indentation, 0, 1, 0, /* | |
| 364 Return the indentation of the current line. | |
| 365 This is the horizontal position of the character | |
| 366 following any initial whitespace. | |
| 367 */ | |
| 368 (buffer)) | |
| 369 { | |
| 370 struct buffer *buf = decode_buffer (buffer, 0); | |
| 665 | 371 Charbpos pos = find_next_newline (buf, BUF_PT (buf), -1); |
| 428 | 372 |
| 793 | 373 buffer = wrap_buffer (buf); |
| 428 | 374 |
| 375 if (!NILP (Fextent_at (make_int (pos), buffer, Qinvisible, Qnil, Qnil))) | |
| 376 return Qzero; | |
| 377 | |
| 826 | 378 return make_int (byte_spaces_at_point (buf, charbpos_to_bytebpos (buf, pos))); |
| 428 | 379 } |
| 380 | |
| 381 | |
| 382 DEFUN ("move-to-column", Fmove_to_column, 1, 3, 0, /* | |
| 383 Move point to column COLUMN in the current line. | |
| 384 The column of a character is calculated by adding together the widths | |
| 385 as displayed of the previous characters in the line. | |
| 386 This function ignores line-continuation; | |
| 387 there is no upper limit on the column number a character can have | |
| 388 and horizontal scrolling has no effect. | |
| 389 | |
| 390 If specified column is within a character, point goes after that character. | |
| 391 If it's past end of line, point goes to end of line. | |
| 392 | |
| 3025 | 393 A value of `coerce' for the second (optional) argument FORCE means if |
| 428 | 394 COLUMN is in the middle of a tab character, change it to spaces. |
| 395 Any other non-nil value means the same, plus if the line is too short to | |
| 396 reach column COLUMN, then add spaces/tabs to get there. | |
| 397 | |
| 398 Returns the actual column that it moved to. | |
| 399 */ | |
| 400 (column, force, buffer)) | |
| 401 { | |
| 402 /* This function can GC */ | |
| 665 | 403 Charbpos pos; |
| 428 | 404 struct buffer *buf = decode_buffer (buffer, 0); |
| 405 int col = current_column (buf); | |
| 406 int goal; | |
| 665 | 407 Charbpos end; |
| 428 | 408 int tab_width = XINT (buf->tab_width); |
| 409 | |
| 410 int prev_col = 0; | |
| 867 | 411 Ichar c = 0; |
| 428 | 412 |
| 793 | 413 buffer = wrap_buffer (buf); |
| 428 | 414 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 415 CHECK_NATNUM (column); | |
| 416 goal = XINT (column); | |
| 417 | |
| 418 retry: | |
| 419 pos = BUF_PT (buf); | |
| 420 end = BUF_ZV (buf); | |
| 421 | |
| 422 /* If we're starting past the desired column, | |
| 423 back up to beginning of line and scan from there. */ | |
| 424 if (col > goal) | |
| 425 { | |
| 426 pos = find_next_newline (buf, pos, -1); | |
| 427 col = 0; | |
| 428 } | |
| 429 | |
| 430 while (col < goal && pos < end) | |
| 431 { | |
| 432 c = BUF_FETCH_CHAR (buf, pos); | |
| 433 if (c == '\n') | |
| 434 break; | |
| 435 if (c == '\r' && EQ (buf->selective_display, Qt)) | |
| 436 break; | |
| 437 if (c == '\t') | |
| 438 { | |
| 439 prev_col = col; | |
| 440 col += tab_width; | |
| 441 col = col / tab_width * tab_width; | |
| 442 } | |
| 443 else | |
| 444 { | |
| 445 /* #### oh for the days of the complete new redisplay */ | |
| 446 /* #### FSFmacs looks at ctl_arrow, display tables. | |
| 447 We need to do similar. */ | |
| 448 #if 0 | |
| 665 | 449 displayed_glyphs = glyphs_from_charbpos (selected_frame (), |
| 428 | 450 buf, |
| 451 XWINDOW (Fselected_window (Qnil)), | |
| 452 pos, dp, 0, col, 0, 0, 0); | |
| 453 col += (displayed_glyphs->columns | |
| 454 - (displayed_glyphs->begin_columns | |
| 455 + displayed_glyphs->end_columns)); | |
| 456 #else /* XEmacs */ | |
| 457 #ifdef MULE | |
| 867 | 458 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 459 #else |
| 460 col ++; | |
| 461 #endif /* MULE */ | |
| 462 #endif /* XEmacs */ | |
| 463 } | |
| 464 | |
| 465 pos++; | |
| 466 } | |
| 467 | |
| 468 BUF_SET_PT (buf, pos); | |
| 469 | |
| 470 /* If a tab char made us overshoot, change it to spaces | |
| 471 and scan through it again. */ | |
| 472 if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) | |
| 473 { | |
| 474 buffer_delete_range (buf, BUF_PT (buf) - 1, BUF_PT (buf), 0); | |
| 475 Findent_to (make_int (col - 1), Qzero, buffer); | |
| 476 buffer_insert_emacs_char (buf, ' '); | |
| 477 goto retry; | |
| 478 } | |
| 479 | |
| 480 /* If line ends prematurely, add space to the end. */ | |
| 481 if (col < goal && !NILP (force) && !EQ (force, Qcoerce)) | |
| 482 { | |
| 483 col = goal; | |
| 484 Findent_to (make_int (col), Qzero, buffer); | |
| 485 } | |
| 486 | |
| 487 last_known_column_buffer = buf; | |
| 488 last_known_column = col; | |
| 489 last_known_column_point = BUF_PT (buf); | |
| 490 last_known_column_modified = BUF_MODIFF (buf); | |
| 491 | |
| 492 return make_int (col); | |
| 493 } | |
| 494 | |
| 495 #if 0 /* #### OK boys, this function needs to be present, I think. | |
| 496 It was there before the 19.12 redisplay rewrite. */ | |
| 497 | |
| 826 | 498 DEFUN ("compute-motion", Fcompute_motion, 7, 7, 0, /* |
| 428 | 499 "Scan through the current buffer, calculating screen position. |
| 500 Scan the current buffer forward from offset FROM, | |
| 501 assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
| 502 to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
| 503 and return the ending buffer position and screen location. | |
| 504 | |
| 505 There are three additional arguments: | |
| 506 | |
| 507 WIDTH is the number of columns available to display text; | |
| 508 this affects handling of continuation lines. | |
| 509 This is usually the value returned by `window-width', less one (to allow | |
| 510 for the continuation glyph). | |
| 511 | |
| 512 OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
| 513 HSCROLL is the number of columns not being displayed at the left | |
| 514 margin; this is usually taken from a window's hscroll member. | |
| 515 TAB-OFFSET is the number of columns of the first tab that aren't | |
| 516 being displayed, perhaps because the line was continued within it. | |
| 517 If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
| 518 | |
| 519 WINDOW is the window to operate on. Currently this is used only to | |
| 520 find the display table. It does not matter what buffer WINDOW displays; | |
| 521 `compute-motion' always operates on the current buffer. | |
| 522 | |
| 523 The value is a list of five elements: | |
| 524 (POS HPOS VPOS PREVHPOS CONTIN) | |
| 525 POS is the buffer position where the scan stopped. | |
| 526 VPOS is the vertical position where the scan stopped. | |
| 527 HPOS is the horizontal position where the scan stopped. | |
| 528 | |
| 529 PREVHPOS is the horizontal position one character back from POS. | |
| 530 CONTIN is t if a line was continued after (or within) the previous character. | |
| 531 | |
| 532 For example, to find the buffer position of column COL of line LINE | |
| 533 of a certain window, pass the window's starting location as FROM | |
| 534 and the window's upper-left coordinates as FROMPOS. | |
| 535 Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
| 536 visible section of the buffer, and pass LINE and COL as TOPOS. | |
| 537 */ | |
| 538 (from, frompos, to, topos, width, offsets, window)) | |
| 539 { | |
| 665 | 540 Lisp_Object charbpos, hpos, vpos, prevhpos, contin; |
| 428 | 541 struct position *pos; |
| 542 int hscroll, tab_offset; | |
| 543 struct window *w = decode_window (window); | |
| 544 | |
| 545 CHECK_INT_COERCE_MARKER (from); | |
| 546 CHECK_CONS (frompos); | |
| 547 CHECK_INT (XCAR (frompos)); | |
| 548 CHECK_INT (XCDR (frompos)); | |
| 549 CHECK_INT_COERCE_MARKER (to); | |
| 550 CHECK_CONS (topos); | |
| 551 CHECK_INT (XCAR (topos)); | |
| 552 CHECK_INT (XCDR (topos)); | |
| 553 CHECK_INT (width); | |
| 554 if (!NILP (offsets)) | |
| 555 { | |
| 556 CHECK_CONS (offsets); | |
| 557 CHECK_INT (XCAR (offsets)); | |
| 558 CHECK_INT (XCDR (offsets)); | |
| 559 hscroll = XINT (XCAR (offsets)); | |
| 560 tab_offset = XINT (XCDR (offsets)); | |
| 561 } | |
| 562 else | |
| 563 hscroll = tab_offset = 0; | |
| 564 | |
| 565 pos = compute_motion (XINT (from), XINT (XCDR (frompos)), | |
| 566 XINT (XCAR (frompos)), | |
| 567 XINT (to), XINT (XCDR (topos)), | |
| 568 XINT (XCAR (topos)), | |
| 569 XINT (width), hscroll, tab_offset, w); | |
| 570 | |
| 793 | 571 charbpos = make_int (pos->charbpos); |
| 572 hpos = make_int (pos->hpos); | |
| 573 vpos = make_int (pos->vpos); | |
| 574 prevhpos = make_int (pos->prevhpos); | |
| 428 | 575 |
| 665 | 576 return list5 (charbpos, hpos, vpos, prevhpos, |
| 428 | 577 pos->contin ? Qt : Qnil); |
| 578 } | |
| 579 | |
| 580 #endif /* 0 */ | |
| 581 | |
| 582 /* Helper for vmotion_1 - compute vertical pixel motion between | |
| 583 START and END in the line start cache CACHE. This just sums | |
| 584 the line heights, including both the starting and ending lines. | |
| 585 */ | |
| 586 static int | |
| 587 vpix_motion (line_start_cache_dynarr *cache, int start, int end) | |
| 588 { | |
| 589 int i, vpix; | |
| 590 | |
| 591 assert (start <= end); | |
| 592 assert (start >= 0); | |
| 593 assert (end < Dynarr_length (cache)); | |
| 594 | |
| 595 vpix = 0; | |
| 596 for (i = start; i <= end; i++) | |
| 597 vpix += Dynarr_atp (cache, i)->height; | |
| 598 | |
| 599 return vpix; | |
| 600 } | |
| 601 | |
| 602 /***************************************************************************** | |
| 603 vmotion_1 | |
| 604 | |
| 605 Given a starting position ORIG, move point VTARGET lines in WINDOW. | |
| 606 Returns the new value for point. If the arg ret_vpos is not nil, it is | |
| 607 taken to be a pointer to an int and the number of lines actually moved is | |
| 608 returned in it. If the arg ret_vpix is not nil, it is taken to be a | |
| 609 pointer to an int and the vertical pixel height of the motion which | |
| 610 took place is returned in it. | |
| 611 ****************************************************************************/ | |
| 665 | 612 static Charbpos |
| 613 vmotion_1 (struct window *w, Charbpos orig, int vtarget, | |
| 428 | 614 int *ret_vpos, int *ret_vpix) |
| 615 { | |
| 616 struct buffer *b = XBUFFER (w->buffer); | |
| 617 int elt; | |
| 618 | |
| 619 elt = point_in_line_start_cache (w, orig, (vtarget < 0 | |
| 620 ? -vtarget | |
| 621 : vtarget)); | |
| 622 | |
| 623 /* #### This assertion must be true before the if statements are hit | |
| 624 but may possibly be wrong after the call to | |
| 625 point_in_line_start_cache if orig is outside of the visible | |
| 626 region of the buffer. Handle this. */ | |
| 627 assert (elt >= 0); | |
| 628 | |
| 629 /* Moving downward. */ | |
| 630 if (vtarget > 0) | |
| 631 { | |
| 632 int cur_line = Dynarr_length (w->line_start_cache) - 1 - elt; | |
| 665 | 633 Charbpos ret_pt; |
| 428 | 634 |
| 635 if (cur_line > vtarget) | |
| 636 cur_line = vtarget; | |
| 637 | |
| 638 /* The traditional FSF behavior is to return the end of buffer | |
| 639 position if we couldn't move far enough because we hit it. */ | |
| 640 if (cur_line < vtarget) | |
| 641 ret_pt = BUF_ZV (b); | |
| 642 else | |
| 643 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start; | |
| 644 | |
| 645 while (ret_pt > BUF_ZV (b) && cur_line > 0) | |
| 646 { | |
| 647 cur_line--; | |
| 648 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start; | |
| 649 } | |
| 650 | |
| 651 if (ret_vpos) *ret_vpos = cur_line; | |
| 652 if (ret_vpix) | |
| 653 *ret_vpix = vpix_motion (w->line_start_cache, elt, cur_line + elt); | |
| 654 return ret_pt; | |
| 655 } | |
| 656 else if (vtarget < 0) | |
| 657 { | |
| 658 if (elt < -vtarget) | |
| 659 { | |
| 660 if (ret_vpos) *ret_vpos = -elt; | |
| 661 if (ret_vpix) | |
| 662 *ret_vpix = vpix_motion (w->line_start_cache, 0, elt); | |
| 663 /* #### This should be BUF_BEGV (b), right? */ | |
| 4967 | 664 return Dynarr_begin (w->line_start_cache)->start; |
| 428 | 665 } |
| 666 else | |
| 667 { | |
| 668 if (ret_vpos) *ret_vpos = vtarget; | |
| 669 if (ret_vpix) | |
| 670 *ret_vpix = vpix_motion (w->line_start_cache, elt + vtarget, elt); | |
| 671 return Dynarr_atp (w->line_start_cache, elt + vtarget)->start; | |
| 672 } | |
| 673 } | |
| 674 else | |
| 675 { | |
| 676 /* No vertical motion requested so we just return the position | |
| 677 of the beginning of the current line. */ | |
| 678 if (ret_vpos) *ret_vpos = 0; | |
| 679 if (ret_vpix) | |
| 680 *ret_vpix = vpix_motion (w->line_start_cache, elt, elt); | |
| 681 | |
| 682 return Dynarr_atp (w->line_start_cache, elt)->start; | |
| 683 } | |
| 684 | |
| 1204 | 685 RETURN_NOT_REACHED(0); /* shut up compiler */ |
| 428 | 686 } |
| 687 | |
| 688 /***************************************************************************** | |
| 689 vmotion | |
| 690 | |
| 691 Given a starting position ORIG, move point VTARGET lines in WINDOW. | |
| 692 Returns the new value for point. If the arg ret_vpos is not nil, it is | |
| 693 taken to be a pointer to an int and the number of lines actually moved is | |
| 694 returned in it. | |
| 695 ****************************************************************************/ | |
| 665 | 696 Charbpos |
| 697 vmotion (struct window *w, Charbpos orig, int vtarget, int *ret_vpos) | |
| 428 | 698 { |
| 699 return vmotion_1 (w, orig, vtarget, ret_vpos, NULL); | |
| 700 } | |
| 701 | |
| 702 /* Helper for Fvertical_motion. | |
| 703 */ | |
| 704 static | |
| 705 Lisp_Object vertical_motion_1 (Lisp_Object lines, Lisp_Object window, | |
| 706 int pixels) | |
| 707 { | |
| 665 | 708 Charbpos charbpos; |
| 709 Charbpos orig; | |
| 428 | 710 int selected; |
| 711 int *vpos, *vpix; | |
| 712 int value=0; | |
| 713 struct window *w; | |
| 714 | |
| 715 if (NILP (window)) | |
| 716 window = Fselected_window (Qnil); | |
| 717 | |
| 718 CHECK_LIVE_WINDOW (window); | |
| 719 CHECK_INT (lines); | |
| 720 | |
| 721 selected = (EQ (window, Fselected_window (Qnil))); | |
| 722 | |
| 723 w = XWINDOW (window); | |
| 724 | |
| 725 orig = selected ? BUF_PT (XBUFFER (w->buffer)) | |
| 726 : marker_position (w->pointm[CURRENT_DISP]); | |
| 727 | |
| 728 vpos = pixels ? NULL : &value; | |
| 729 vpix = pixels ? &value : NULL; | |
| 730 | |
| 665 | 731 charbpos = vmotion_1 (w, orig, XINT (lines), vpos, vpix); |
| 428 | 732 |
| 733 /* Note that the buffer's point is set, not the window's point. */ | |
| 734 if (selected) | |
| 665 | 735 BUF_SET_PT (XBUFFER (w->buffer), charbpos); |
| 428 | 736 else |
| 737 set_marker_restricted (w->pointm[CURRENT_DISP], | |
| 665 | 738 make_int(charbpos), |
| 428 | 739 w->buffer); |
| 740 | |
| 741 return make_int (value); | |
| 742 } | |
| 743 | |
| 744 DEFUN ("vertical-motion", Fvertical_motion, 1, 3, 0, /* | |
| 745 Move to start of frame line LINES lines down. | |
| 746 If LINES is negative, this is moving up. | |
| 747 Optional second argument is WINDOW to move in, | |
| 748 the default is the selected window. | |
| 749 | |
| 750 Sets point to position found; this may be start of line | |
| 751 or just the start of a continuation line. | |
| 752 If optional third argument PIXELS is nil, returns number | |
| 753 of lines moved; may be closer to zero than LINES if beginning | |
| 754 or end of buffer was reached. If PIXELS is non-nil, the | |
| 755 vertical pixel height of the motion which took place is | |
| 756 returned instead of the actual number of lines moved. A | |
| 757 motion of zero lines returns the height of the current line. | |
| 758 | |
| 1268 | 759 NOTE NOTE NOTE: GNU Emacs/XEmacs difference. |
| 760 | |
| 761 What `vertical-motion' actually does is set WINDOW's buffer's point | |
| 762 if WINDOW is the selected window; else, it sets WINDOW's point. | |
| 763 This is unfortunately somewhat tricky to work with, and different | |
| 764 from GNU Emacs, which always uses the current buffer, not WINDOW's | |
| 765 buffer, always sets current buffer's point, and, from the | |
| 766 perspective of this function, temporarily makes WINDOW display | |
| 767 the current buffer if it wasn't already. | |
| 428 | 768 */ |
| 769 (lines, window, pixels)) | |
| 770 { | |
| 771 return vertical_motion_1 (lines, window, !NILP (pixels)); | |
| 772 } | |
| 773 | |
| 774 /* | |
| 775 * Like vmotion() but requested and returned movement is in pixels. | |
| 776 * HOW specifies the stopping condition. Positive means move at least | |
| 777 * PIXELS. Negative means at most. Zero means as close as possible. | |
| 778 */ | |
| 665 | 779 Charbpos |
| 780 vmotion_pixels (Lisp_Object window, Charbpos start, int pixels, int how, | |
| 428 | 781 int *motion) |
| 782 { | |
| 783 struct window *w; | |
| 665 | 784 Charbpos eobuf, bobuf; |
| 428 | 785 int defheight; |
| 786 int needed; | |
| 787 int line, next; | |
| 788 int remain, abspix, dirn; | |
| 789 int elt, nelt; | |
| 790 int i; | |
| 791 line_start_cache_dynarr *cache; | |
| 792 int previous = -1; | |
| 793 int lines; | |
| 794 | |
| 795 if (NILP (window)) | |
| 796 window = Fselected_window (Qnil); | |
| 797 | |
| 798 CHECK_LIVE_WINDOW (window); | |
| 799 w = XWINDOW (window); | |
| 800 | |
| 801 eobuf = BUF_ZV (XBUFFER (w->buffer)); | |
| 802 bobuf = BUF_BEGV (XBUFFER (w->buffer)); | |
| 803 | |
|
5047
07dcc7000bbf
put width before height consistently, fix a real bug found in the process
Ben Wing <ben@xemacs.org>
parents:
4998
diff
changeset
|
804 default_face_width_and_height (window, NULL, &defheight); |
| 428 | 805 |
| 806 /* guess num lines needed in line start cache + a few extra */ | |
| 807 abspix = abs (pixels); | |
| 808 needed = (abspix + defheight-1)/defheight + 3; | |
| 809 | |
| 810 dirn = (pixels >= 0) ? 1 : -1; | |
| 811 | |
| 812 while (1) | |
| 813 { | |
| 814 elt = point_in_line_start_cache (w, start, needed); | |
| 815 assert (elt >= 0); /* in the cache */ | |
| 816 | |
| 817 cache = w->line_start_cache; | |
| 818 nelt = Dynarr_length (cache); | |
| 819 | |
| 820 *motion = 0; | |
| 821 | |
| 822 if (pixels == 0) | |
| 823 /* No vertical motion requested so we just return the position | |
| 824 of the beginning of the current display line. */ | |
| 825 return Dynarr_atp (cache, elt)->start; | |
| 826 | |
| 827 if ((dirn < 0 && elt == 0 && | |
| 828 Dynarr_atp (cache, elt)->start <= bobuf) || | |
| 829 (dirn > 0 && elt == nelt-1 && | |
| 830 Dynarr_atp (cache, elt)->end >= eobuf)) | |
| 831 return Dynarr_atp (cache, elt)->start; | |
| 832 | |
| 833 remain = abspix; | |
| 834 for (i = elt; (dirn > 0) ? (i < nelt) : (i > 0); i += dirn) | |
| 835 { | |
| 836 /* cache line we're considering moving over */ | |
| 837 int ii = (dirn > 0) ? i : i-1; | |
| 838 | |
| 839 if (remain < 0) | |
| 840 return Dynarr_atp (cache, i)->start; | |
| 841 | |
| 842 line = Dynarr_atp (cache, ii)->height; | |
| 843 next = remain - line; | |
| 844 | |
| 845 /* is stopping condition satisfied? */ | |
| 846 if ((how > 0 && remain <= 0) || /* at least */ | |
| 847 (how < 0 && next < 0) || /* at most */ | |
| 848 (how == 0 && remain <= abs (next))) /* closest */ | |
| 849 return Dynarr_atp (cache, i)->start; | |
| 850 | |
| 851 /* moving down and nowhere left to go? */ | |
| 852 if (dirn > 0 && Dynarr_atp (cache, ii)->end >= eobuf) | |
| 853 return Dynarr_atp (cache, ii)->start; | |
| 854 | |
| 855 /* take the step */ | |
| 856 remain = next; | |
| 857 *motion += dirn * line; | |
| 858 | |
| 859 /* moving up and nowhere left to go? */ | |
| 860 if (dirn < 0 && Dynarr_atp (cache, ii)->start <= bobuf) | |
| 861 return Dynarr_atp (cache, ii)->start; | |
| 862 } | |
| 863 | |
| 864 /* get here => need more cache lines. try again. */ | |
| 865 assert (abs (*motion) > previous); /* progress? */ | |
| 866 previous = abs (*motion); | |
| 867 | |
| 868 lines = (pixels < 0) ? elt : (nelt - elt); | |
| 869 needed += (remain*lines + abspix-1)/abspix + 3; | |
| 870 } | |
| 871 | |
| 1204 | 872 RETURN_NOT_REACHED(0); /* shut up compiler */ |
| 428 | 873 } |
| 874 | |
| 875 DEFUN ("vertical-motion-pixels", Fvertical_motion_pixels, 1, 3, 0, /* | |
| 876 Move to start of frame line PIXELS vertical pixels down. | |
| 877 If PIXELS is negative, this is moving up. | |
| 878 The actual vertical motion in pixels is returned. | |
| 879 | |
| 880 Optional second argument is WINDOW to move in, | |
| 881 the default is the selected window. | |
| 882 | |
| 883 Optional third argument HOW specifies when to stop. A value | |
| 884 less than zero indicates that the motion should be no more | |
| 885 than PIXELS. A value greater than zero indicates that the | |
| 886 motion should be at least PIXELS. Any other value indicates | |
| 887 that the motion should be as close as possible to PIXELS. | |
| 888 */ | |
| 889 (pixels, window, how)) | |
| 890 { | |
| 665 | 891 Charbpos charbpos; |
| 892 Charbpos orig; | |
| 428 | 893 int selected; |
| 894 int motion; | |
| 895 int howto; | |
| 896 struct window *w; | |
| 897 | |
| 898 if (NILP (window)) | |
| 899 window = Fselected_window (Qnil); | |
| 900 | |
| 901 CHECK_LIVE_WINDOW (window); | |
| 902 CHECK_INT (pixels); | |
| 903 | |
| 904 selected = (EQ (window, Fselected_window (Qnil))); | |
| 905 | |
| 906 w = XWINDOW (window); | |
| 907 | |
| 908 orig = selected ? BUF_PT (XBUFFER (w->buffer)) | |
| 909 : marker_position (w->pointm[CURRENT_DISP]); | |
| 910 | |
| 911 howto = INTP (how) ? XINT (how) : 0; | |
| 912 | |
| 665 | 913 charbpos = vmotion_pixels (window, orig, XINT (pixels), howto, &motion); |
| 428 | 914 |
| 915 if (selected) | |
| 665 | 916 BUF_SET_PT (XBUFFER (w->buffer), charbpos); |
| 428 | 917 else |
| 918 set_marker_restricted (w->pointm[CURRENT_DISP], | |
| 665 | 919 make_int(charbpos), |
| 428 | 920 w->buffer); |
| 921 | |
| 922 return make_int (motion); | |
| 923 } | |
| 924 | |
| 925 | |
| 926 void | |
| 927 syms_of_indent (void) | |
| 928 { | |
| 929 DEFSUBR (Fcurrent_indentation); | |
| 930 DEFSUBR (Findent_to); | |
| 931 DEFSUBR (Fcurrent_column); | |
| 932 DEFSUBR (Fmove_to_column); | |
| 933 #if 0 /* #### */ | |
| 934 DEFSUBR (Fcompute_motion); | |
| 935 #endif | |
| 936 DEFSUBR (Fvertical_motion); | |
| 937 DEFSUBR (Fvertical_motion_pixels); | |
| 938 } | |
| 939 | |
| 940 void | |
| 941 vars_of_indent (void) | |
| 942 { | |
| 943 DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode /* | |
| 944 *Indentation can insert tabs if this is non-nil. | |
| 945 Setting this variable automatically makes it local to the current buffer. | |
| 946 */ ); | |
| 947 indent_tabs_mode = 1; | |
| 948 } |