Mercurial > hg > xemacs-beta
annotate src/indent.c @ 5435:aa729daae5e2
Added GPLv3 or later license and copyright notice to GTK ChangeLogs.
| author | Mats Lidell <matsl@xemacs.org> |
|---|---|
| date | Sat, 13 Nov 2010 00:15:17 +0100 |
| parents | 308d34e9f07d |
| children | 8d29f1c4bb98 |
| 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 | |
|
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9 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 10 under the terms of the GNU General Public License as published by the |
|
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Mats Lidell <matsl@xemacs.org>
parents:
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diff
changeset
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11 Free Software Foundation, either version 3 of the License, or (at your |
|
308d34e9f07d
Changed bulk of GPLv2 or later files identified by script
Mats Lidell <matsl@xemacs.org>
parents:
5047
diff
changeset
|
12 option) any later version. |
| 428 | 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 | |
|
5402
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Mats Lidell <matsl@xemacs.org>
parents:
5047
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changeset
|
20 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 21 |
| 22 /* This file has been Mule-ized. */ | |
| 23 | |
| 24 /* Synched up with: 19.30. Diverges significantly from FSF. */ | |
| 25 | |
| 26 | |
| 27 #include <config.h> | |
| 28 #include "lisp.h" | |
| 29 | |
| 30 #include "buffer.h" | |
| 31 #include "device.h" | |
| 32 #include "extents.h" | |
| 33 #include "faces.h" | |
| 34 #include "frame.h" | |
| 35 #include "glyphs.h" | |
| 36 #include "insdel.h" | |
| 37 #ifdef REGION_CACHE_NEEDS_WORK | |
| 38 #include "region-cache.h" | |
| 39 #endif | |
| 40 #include "window.h" | |
| 41 | |
| 42 /* Indentation can insert tabs if this is non-zero; | |
| 43 otherwise always uses spaces */ | |
| 44 int indent_tabs_mode; | |
| 45 | |
| 46 /* Avoid recalculation by remembering things in these variables. */ | |
| 47 | |
| 48 /* Last value returned by current_column. | |
| 49 | |
| 50 Some things set last_known_column_point to -1 | |
| 51 to mark the memoized value as invalid */ | |
| 52 static int last_known_column; | |
| 53 | |
| 54 /* Last buffer searched by current_column */ | |
| 55 static struct buffer *last_known_column_buffer; | |
| 56 | |
| 57 /* Value of point when current_column was called */ | |
| 665 | 58 static Charbpos last_known_column_point; |
| 428 | 59 |
| 60 /* Value of MODIFF when current_column was called */ | |
| 61 static int last_known_column_modified; | |
| 62 | |
| 665 | 63 static Charbpos |
| 64 last_visible_position (Charbpos pos, struct buffer *buf) | |
| 428 | 65 { |
| 66 Lisp_Object buffer; | |
| 67 Lisp_Object value; | |
| 68 | |
| 793 | 69 buffer = wrap_buffer (buf); |
| 2506 | 70 value = Fprevious_single_char_property_change (make_int (pos), Qinvisible, |
| 71 buffer, Qnil); | |
| 428 | 72 if (NILP (value)) |
| 73 return 0; /* no visible position found */ | |
| 74 else | |
| 75 /* #### bug bug bug!!! This will return the position of the beginning | |
| 76 of an invisible extent; this extent is very likely to be start-closed, | |
| 77 and thus the spaces inserted in `indent-to' will go inside the | |
| 78 invisible extent. | |
| 79 | |
| 80 Not sure what the correct solution is here. Rethink indent-to? */ | |
| 81 return XINT (value); | |
| 82 } | |
| 83 | |
| 84 #ifdef REGION_CACHE_NEEDS_WORK | |
| 85 | |
| 86 /* Allocate or free the width run cache, as requested by the current | |
| 87 state of current_buffer's cache_long_line_scans variable. */ | |
| 88 static void | |
| 89 width_run_cache_on_off (struct buffer *buf) | |
| 90 { | |
| 91 if (NILP (buf->cache_long_line_scans)) | |
| 92 { | |
| 93 /* It should be off. */ | |
| 94 if (buf->width_run_cache) | |
| 95 { | |
| 96 free_region_cache (buf->width_run_cache); | |
| 97 buf->width_run_cache = 0; | |
| 98 buf->width_table = Qnil; | |
| 99 } | |
| 100 } | |
| 101 else | |
| 102 { | |
| 103 /* It should be on. */ | |
| 104 if (buf->width_run_cache == 0) | |
| 105 { | |
| 106 buf->width_run_cache = new_region_cache (); | |
| 107 recompute_width_table (buf, buffer_display_table ()); | |
| 108 } | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 #endif /* REGION_CACHE_NEEDS_WORK */ | |
| 113 | |
| 114 | |
| 115 /* Cancel any recorded value of the horizontal position. */ | |
| 116 | |
| 117 void | |
| 118 invalidate_current_column (void) | |
| 119 { | |
| 120 last_known_column_point = -1; | |
| 121 } | |
| 122 | |
| 123 int | |
| 665 | 124 column_at_point (struct buffer *buf, Charbpos init_pos, int cur_col) |
| 428 | 125 { |
| 126 int col; | |
| 127 int tab_seen; | |
| 128 int tab_width = XINT (buf->tab_width); | |
| 129 int post_tab; | |
| 665 | 130 Charbpos pos = init_pos; |
| 867 | 131 Ichar c; |
| 428 | 132 |
| 133 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 134 col = tab_seen = post_tab = 0; | |
| 135 | |
| 136 while (1) | |
| 137 { | |
| 138 if (pos <= BUF_BEGV (buf)) | |
| 139 break; | |
| 140 | |
| 141 pos--; | |
| 142 c = BUF_FETCH_CHAR (buf, pos); | |
| 143 if (c == '\t') | |
| 144 { | |
| 145 if (tab_seen) | |
| 146 col = ((col + tab_width) / tab_width) * tab_width; | |
| 147 | |
| 148 post_tab += col; | |
| 149 col = 0; | |
| 150 tab_seen = 1; | |
| 151 } | |
| 152 else if (c == '\n' || | |
| 153 (EQ (buf->selective_display, Qt) && c == '\r')) | |
| 154 break; | |
| 155 else | |
| 156 { | |
| 157 /* #### This needs updating to handle the new redisplay. */ | |
| 158 /* #### FSFmacs looks at ctl_arrow, display tables. | |
| 159 We need to do similar. */ | |
| 160 #if 0 | |
| 665 | 161 displayed_glyphs = glyphs_from_charbpos (sel_frame, buf, |
| 428 | 162 XWINDOW (selected_window), |
| 163 pos, dp, 0, col, 0, 0, 0); | |
| 164 col += (displayed_glyphs->columns | |
| 165 - (displayed_glyphs->begin_columns | |
| 166 + displayed_glyphs->end_columns)); | |
| 167 #else /* XEmacs */ | |
| 168 #ifdef MULE | |
| 867 | 169 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 170 #else |
| 171 col ++; | |
| 172 #endif /* MULE */ | |
| 173 #endif /* XEmacs */ | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 if (tab_seen) | |
| 178 { | |
| 179 col = ((col + tab_width) / tab_width) * tab_width; | |
| 180 col += post_tab; | |
| 181 } | |
| 182 | |
| 183 if (cur_col) | |
| 184 { | |
| 185 last_known_column_buffer = buf; | |
| 186 last_known_column = col; | |
| 187 last_known_column_point = init_pos; | |
| 188 last_known_column_modified = BUF_MODIFF (buf); | |
| 189 } | |
| 190 | |
| 191 return col; | |
| 192 } | |
| 193 | |
| 194 int | |
| 793 | 195 string_column_at_point (Lisp_Object s, Charbpos init_pos, int tab_width) |
| 428 | 196 { |
| 197 int col; | |
| 198 int tab_seen; | |
| 199 int post_tab; | |
| 665 | 200 Charbpos pos = init_pos; |
| 867 | 201 Ichar c; |
| 428 | 202 |
| 203 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 204 col = tab_seen = post_tab = 0; | |
| 205 | |
| 206 while (1) | |
| 207 { | |
| 208 if (pos <= 0) | |
| 209 break; | |
| 210 | |
| 211 pos--; | |
| 867 | 212 c = string_ichar (s, pos); |
| 428 | 213 if (c == '\t') |
| 214 { | |
| 215 if (tab_seen) | |
| 216 col = ((col + tab_width) / tab_width) * tab_width; | |
| 217 | |
| 218 post_tab += col; | |
| 219 col = 0; | |
| 220 tab_seen = 1; | |
| 221 } | |
| 222 else if (c == '\n') | |
| 223 break; | |
| 224 else | |
| 225 #ifdef MULE | |
| 867 | 226 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 227 #else |
| 228 col ++; | |
| 229 #endif /* MULE */ | |
| 230 } | |
| 231 | |
| 232 if (tab_seen) | |
| 233 { | |
| 234 col = ((col + tab_width) / tab_width) * tab_width; | |
| 235 col += post_tab; | |
| 236 } | |
| 237 | |
| 238 return col; | |
| 239 } | |
| 240 | |
| 241 int | |
| 242 current_column (struct buffer *buf) | |
| 243 { | |
| 244 if (buf == last_known_column_buffer | |
| 245 && BUF_PT (buf) == last_known_column_point | |
| 246 && BUF_MODIFF (buf) == last_known_column_modified) | |
| 247 return last_known_column; | |
| 248 | |
| 249 return column_at_point (buf, BUF_PT (buf), 1); | |
| 250 } | |
| 251 | |
| 252 DEFUN ("current-column", Fcurrent_column, 0, 1, 0, /* | |
| 253 Return the horizontal position of point. Beginning of line is column 0. | |
| 254 This is calculated by adding together the widths of all the displayed | |
| 255 representations of the character between the start of the previous line | |
| 256 and point. (e.g. control characters will have a width of 2 or 4, tabs | |
| 257 will have a variable width.) | |
| 258 Ignores finite width of frame, which means that this function may return | |
| 259 values greater than (frame-width). | |
| 260 Whether the line is visible (if `selective-display' is t) has no effect; | |
| 261 however, ^M is treated as end of line when `selective-display' is t. | |
| 262 If BUFFER is nil, the current buffer is assumed. | |
| 263 */ | |
| 264 (buffer)) | |
| 265 { | |
| 266 return make_int (current_column (decode_buffer (buffer, 0))); | |
| 267 } | |
| 268 | |
| 269 | |
| 270 DEFUN ("indent-to", Findent_to, 1, 3, "NIndent to column: ", /* | |
| 271 Indent from point with tabs and spaces until COLUMN is reached. | |
| 444 | 272 Optional second argument MINIMUM says always do at least MINIMUM spaces |
| 273 even if that goes past COLUMN; by default, MINIMUM is zero. | |
| 428 | 274 If BUFFER is nil, the current buffer is assumed. |
| 275 */ | |
| 444 | 276 (column, minimum, buffer)) |
| 428 | 277 { |
| 278 /* This function can GC */ | |
| 279 int mincol; | |
| 280 int fromcol; | |
| 281 struct buffer *buf = decode_buffer (buffer, 0); | |
| 282 int tab_width = XINT (buf->tab_width); | |
| 665 | 283 Charbpos opoint = 0; |
| 428 | 284 |
| 444 | 285 CHECK_INT (column); |
| 428 | 286 if (NILP (minimum)) |
| 287 minimum = Qzero; | |
| 288 else | |
| 289 CHECK_INT (minimum); | |
| 290 | |
| 793 | 291 buffer = wrap_buffer (buf); |
| 428 | 292 |
| 293 fromcol = current_column (buf); | |
| 294 mincol = fromcol + XINT (minimum); | |
| 444 | 295 if (mincol < XINT (column)) mincol = XINT (column); |
| 428 | 296 |
| 297 if (fromcol == mincol) | |
| 298 return make_int (mincol); | |
| 299 | |
| 300 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; | |
| 301 | |
| 302 if (!NILP (Fextent_at (make_int (BUF_PT (buf)), buffer, Qinvisible, | |
| 303 Qnil, Qnil))) | |
| 304 { | |
| 665 | 305 Charbpos last_visible = last_visible_position (BUF_PT (buf), buf); |
| 428 | 306 |
| 307 opoint = BUF_PT (buf); | |
| 308 if (last_visible >= BUF_BEGV (buf)) | |
| 309 BUF_SET_PT (buf, last_visible); | |
| 310 else | |
| 563 | 311 invalid_operation ("Visible portion of buffer not modifiable", Qunbound); |
| 428 | 312 } |
| 313 | |
| 314 if (indent_tabs_mode) | |
| 315 { | |
| 316 int n = mincol / tab_width - fromcol / tab_width; | |
| 317 if (n != 0) | |
| 318 { | |
| 319 Finsert_char (make_char ('\t'), make_int (n), Qnil, buffer); | |
| 320 | |
| 321 fromcol = (mincol / tab_width) * tab_width; | |
| 322 } | |
| 323 } | |
| 324 | |
| 325 Finsert_char (make_char (' '), make_int (mincol - fromcol), Qnil, buffer); | |
| 326 | |
| 327 last_known_column_buffer = buf; | |
| 328 last_known_column = mincol; | |
| 329 last_known_column_point = BUF_PT (buf); | |
| 330 last_known_column_modified = BUF_MODIFF (buf); | |
| 331 | |
| 332 /* Not in FSF: */ | |
| 333 if (opoint > 0) | |
| 334 BUF_SET_PT (buf, opoint); | |
| 335 | |
| 336 return make_int (mincol); | |
| 337 } | |
| 338 | |
| 339 int | |
| 826 | 340 byte_spaces_at_point (struct buffer *b, Bytebpos byte_pos) |
| 428 | 341 { |
| 826 | 342 Bytebpos byte_end = BYTE_BUF_ZV (b); |
| 428 | 343 int col = 0; |
| 867 | 344 Ichar c; |
| 428 | 345 int tab_width = XINT (b->tab_width); |
| 346 | |
| 347 if (tab_width <= 0 || tab_width > 1000) | |
| 348 tab_width = 8; | |
| 349 | |
| 826 | 350 while (byte_pos < byte_end && |
| 351 (c = BYTE_BUF_FETCH_CHAR (b, byte_pos), | |
| 428 | 352 (c == '\t' |
| 353 ? (col += tab_width - col % tab_width) | |
| 354 : (c == ' ' ? ++col : 0)))) | |
| 826 | 355 INC_BYTEBPOS (b, byte_pos); |
| 428 | 356 |
| 357 return col; | |
| 358 } | |
| 359 | |
| 360 | |
| 361 DEFUN ("current-indentation", Fcurrent_indentation, 0, 1, 0, /* | |
| 362 Return the indentation of the current line. | |
| 363 This is the horizontal position of the character | |
| 364 following any initial whitespace. | |
| 365 */ | |
| 366 (buffer)) | |
| 367 { | |
| 368 struct buffer *buf = decode_buffer (buffer, 0); | |
| 665 | 369 Charbpos pos = find_next_newline (buf, BUF_PT (buf), -1); |
| 428 | 370 |
| 793 | 371 buffer = wrap_buffer (buf); |
| 428 | 372 |
| 373 if (!NILP (Fextent_at (make_int (pos), buffer, Qinvisible, Qnil, Qnil))) | |
| 374 return Qzero; | |
| 375 | |
| 826 | 376 return make_int (byte_spaces_at_point (buf, charbpos_to_bytebpos (buf, pos))); |
| 428 | 377 } |
| 378 | |
| 379 | |
| 380 DEFUN ("move-to-column", Fmove_to_column, 1, 3, 0, /* | |
| 381 Move point to column COLUMN in the current line. | |
| 382 The column of a character is calculated by adding together the widths | |
| 383 as displayed of the previous characters in the line. | |
| 384 This function ignores line-continuation; | |
| 385 there is no upper limit on the column number a character can have | |
| 386 and horizontal scrolling has no effect. | |
| 387 | |
| 388 If specified column is within a character, point goes after that character. | |
| 389 If it's past end of line, point goes to end of line. | |
| 390 | |
| 3025 | 391 A value of `coerce' for the second (optional) argument FORCE means if |
| 428 | 392 COLUMN is in the middle of a tab character, change it to spaces. |
| 393 Any other non-nil value means the same, plus if the line is too short to | |
| 394 reach column COLUMN, then add spaces/tabs to get there. | |
| 395 | |
| 396 Returns the actual column that it moved to. | |
| 397 */ | |
| 398 (column, force, buffer)) | |
| 399 { | |
| 400 /* This function can GC */ | |
| 665 | 401 Charbpos pos; |
| 428 | 402 struct buffer *buf = decode_buffer (buffer, 0); |
| 403 int col = current_column (buf); | |
| 404 int goal; | |
| 665 | 405 Charbpos end; |
| 428 | 406 int tab_width = XINT (buf->tab_width); |
| 407 | |
| 408 int prev_col = 0; | |
| 867 | 409 Ichar c = 0; |
| 428 | 410 |
| 793 | 411 buffer = wrap_buffer (buf); |
| 428 | 412 if (tab_width <= 0 || tab_width > 1000) tab_width = 8; |
| 413 CHECK_NATNUM (column); | |
| 414 goal = XINT (column); | |
| 415 | |
| 416 retry: | |
| 417 pos = BUF_PT (buf); | |
| 418 end = BUF_ZV (buf); | |
| 419 | |
| 420 /* If we're starting past the desired column, | |
| 421 back up to beginning of line and scan from there. */ | |
| 422 if (col > goal) | |
| 423 { | |
| 424 pos = find_next_newline (buf, pos, -1); | |
| 425 col = 0; | |
| 426 } | |
| 427 | |
| 428 while (col < goal && pos < end) | |
| 429 { | |
| 430 c = BUF_FETCH_CHAR (buf, pos); | |
| 431 if (c == '\n') | |
| 432 break; | |
| 433 if (c == '\r' && EQ (buf->selective_display, Qt)) | |
| 434 break; | |
| 435 if (c == '\t') | |
| 436 { | |
| 437 prev_col = col; | |
| 438 col += tab_width; | |
| 439 col = col / tab_width * tab_width; | |
| 440 } | |
| 441 else | |
| 442 { | |
| 443 /* #### oh for the days of the complete new redisplay */ | |
| 444 /* #### FSFmacs looks at ctl_arrow, display tables. | |
| 445 We need to do similar. */ | |
| 446 #if 0 | |
| 665 | 447 displayed_glyphs = glyphs_from_charbpos (selected_frame (), |
| 428 | 448 buf, |
| 449 XWINDOW (Fselected_window (Qnil)), | |
| 450 pos, dp, 0, col, 0, 0, 0); | |
| 451 col += (displayed_glyphs->columns | |
| 452 - (displayed_glyphs->begin_columns | |
| 453 + displayed_glyphs->end_columns)); | |
| 454 #else /* XEmacs */ | |
| 455 #ifdef MULE | |
| 867 | 456 col += XCHARSET_COLUMNS (ichar_charset (c)); |
| 428 | 457 #else |
| 458 col ++; | |
| 459 #endif /* MULE */ | |
| 460 #endif /* XEmacs */ | |
| 461 } | |
| 462 | |
| 463 pos++; | |
| 464 } | |
| 465 | |
| 466 BUF_SET_PT (buf, pos); | |
| 467 | |
| 468 /* If a tab char made us overshoot, change it to spaces | |
| 469 and scan through it again. */ | |
| 470 if (!NILP (force) && col > goal && c == '\t' && prev_col < goal) | |
| 471 { | |
| 472 buffer_delete_range (buf, BUF_PT (buf) - 1, BUF_PT (buf), 0); | |
| 473 Findent_to (make_int (col - 1), Qzero, buffer); | |
| 474 buffer_insert_emacs_char (buf, ' '); | |
| 475 goto retry; | |
| 476 } | |
| 477 | |
| 478 /* If line ends prematurely, add space to the end. */ | |
| 479 if (col < goal && !NILP (force) && !EQ (force, Qcoerce)) | |
| 480 { | |
| 481 col = goal; | |
| 482 Findent_to (make_int (col), Qzero, buffer); | |
| 483 } | |
| 484 | |
| 485 last_known_column_buffer = buf; | |
| 486 last_known_column = col; | |
| 487 last_known_column_point = BUF_PT (buf); | |
| 488 last_known_column_modified = BUF_MODIFF (buf); | |
| 489 | |
| 490 return make_int (col); | |
| 491 } | |
| 492 | |
| 493 #if 0 /* #### OK boys, this function needs to be present, I think. | |
| 494 It was there before the 19.12 redisplay rewrite. */ | |
| 495 | |
| 826 | 496 DEFUN ("compute-motion", Fcompute_motion, 7, 7, 0, /* |
| 428 | 497 "Scan through the current buffer, calculating screen position. |
| 498 Scan the current buffer forward from offset FROM, | |
| 499 assuming it is at position FROMPOS--a cons of the form (HPOS . VPOS)-- | |
| 500 to position TO or position TOPOS--another cons of the form (HPOS . VPOS)-- | |
| 501 and return the ending buffer position and screen location. | |
| 502 | |
| 503 There are three additional arguments: | |
| 504 | |
| 505 WIDTH is the number of columns available to display text; | |
| 506 this affects handling of continuation lines. | |
| 507 This is usually the value returned by `window-width', less one (to allow | |
| 508 for the continuation glyph). | |
| 509 | |
| 510 OFFSETS is either nil or a cons cell (HSCROLL . TAB-OFFSET). | |
| 511 HSCROLL is the number of columns not being displayed at the left | |
| 512 margin; this is usually taken from a window's hscroll member. | |
| 513 TAB-OFFSET is the number of columns of the first tab that aren't | |
| 514 being displayed, perhaps because the line was continued within it. | |
| 515 If OFFSETS is nil, HSCROLL and TAB-OFFSET are assumed to be zero. | |
| 516 | |
| 517 WINDOW is the window to operate on. Currently this is used only to | |
| 518 find the display table. It does not matter what buffer WINDOW displays; | |
| 519 `compute-motion' always operates on the current buffer. | |
| 520 | |
| 521 The value is a list of five elements: | |
| 522 (POS HPOS VPOS PREVHPOS CONTIN) | |
| 523 POS is the buffer position where the scan stopped. | |
| 524 VPOS is the vertical position where the scan stopped. | |
| 525 HPOS is the horizontal position where the scan stopped. | |
| 526 | |
| 527 PREVHPOS is the horizontal position one character back from POS. | |
| 528 CONTIN is t if a line was continued after (or within) the previous character. | |
| 529 | |
| 530 For example, to find the buffer position of column COL of line LINE | |
| 531 of a certain window, pass the window's starting location as FROM | |
| 532 and the window's upper-left coordinates as FROMPOS. | |
| 533 Pass the buffer's (point-max) as TO, to limit the scan to the end of the | |
| 534 visible section of the buffer, and pass LINE and COL as TOPOS. | |
| 535 */ | |
| 536 (from, frompos, to, topos, width, offsets, window)) | |
| 537 { | |
| 665 | 538 Lisp_Object charbpos, hpos, vpos, prevhpos, contin; |
| 428 | 539 struct position *pos; |
| 540 int hscroll, tab_offset; | |
| 541 struct window *w = decode_window (window); | |
| 542 | |
| 543 CHECK_INT_COERCE_MARKER (from); | |
| 544 CHECK_CONS (frompos); | |
| 545 CHECK_INT (XCAR (frompos)); | |
| 546 CHECK_INT (XCDR (frompos)); | |
| 547 CHECK_INT_COERCE_MARKER (to); | |
| 548 CHECK_CONS (topos); | |
| 549 CHECK_INT (XCAR (topos)); | |
| 550 CHECK_INT (XCDR (topos)); | |
| 551 CHECK_INT (width); | |
| 552 if (!NILP (offsets)) | |
| 553 { | |
| 554 CHECK_CONS (offsets); | |
| 555 CHECK_INT (XCAR (offsets)); | |
| 556 CHECK_INT (XCDR (offsets)); | |
| 557 hscroll = XINT (XCAR (offsets)); | |
| 558 tab_offset = XINT (XCDR (offsets)); | |
| 559 } | |
| 560 else | |
| 561 hscroll = tab_offset = 0; | |
| 562 | |
| 563 pos = compute_motion (XINT (from), XINT (XCDR (frompos)), | |
| 564 XINT (XCAR (frompos)), | |
| 565 XINT (to), XINT (XCDR (topos)), | |
| 566 XINT (XCAR (topos)), | |
| 567 XINT (width), hscroll, tab_offset, w); | |
| 568 | |
| 793 | 569 charbpos = make_int (pos->charbpos); |
| 570 hpos = make_int (pos->hpos); | |
| 571 vpos = make_int (pos->vpos); | |
| 572 prevhpos = make_int (pos->prevhpos); | |
| 428 | 573 |
| 665 | 574 return list5 (charbpos, hpos, vpos, prevhpos, |
| 428 | 575 pos->contin ? Qt : Qnil); |
| 576 } | |
| 577 | |
| 578 #endif /* 0 */ | |
| 579 | |
| 580 /* Helper for vmotion_1 - compute vertical pixel motion between | |
| 581 START and END in the line start cache CACHE. This just sums | |
| 582 the line heights, including both the starting and ending lines. | |
| 583 */ | |
| 584 static int | |
| 585 vpix_motion (line_start_cache_dynarr *cache, int start, int end) | |
| 586 { | |
| 587 int i, vpix; | |
| 588 | |
| 589 assert (start <= end); | |
| 590 assert (start >= 0); | |
| 591 assert (end < Dynarr_length (cache)); | |
| 592 | |
| 593 vpix = 0; | |
| 594 for (i = start; i <= end; i++) | |
| 595 vpix += Dynarr_atp (cache, i)->height; | |
| 596 | |
| 597 return vpix; | |
| 598 } | |
| 599 | |
| 600 /***************************************************************************** | |
| 601 vmotion_1 | |
| 602 | |
| 603 Given a starting position ORIG, move point VTARGET lines in WINDOW. | |
| 604 Returns the new value for point. If the arg ret_vpos is not nil, it is | |
| 605 taken to be a pointer to an int and the number of lines actually moved is | |
| 606 returned in it. If the arg ret_vpix is not nil, it is taken to be a | |
| 607 pointer to an int and the vertical pixel height of the motion which | |
| 608 took place is returned in it. | |
| 609 ****************************************************************************/ | |
| 665 | 610 static Charbpos |
| 611 vmotion_1 (struct window *w, Charbpos orig, int vtarget, | |
| 428 | 612 int *ret_vpos, int *ret_vpix) |
| 613 { | |
| 614 struct buffer *b = XBUFFER (w->buffer); | |
| 615 int elt; | |
| 616 | |
| 617 elt = point_in_line_start_cache (w, orig, (vtarget < 0 | |
| 618 ? -vtarget | |
| 619 : vtarget)); | |
| 620 | |
| 621 /* #### This assertion must be true before the if statements are hit | |
| 622 but may possibly be wrong after the call to | |
| 623 point_in_line_start_cache if orig is outside of the visible | |
| 624 region of the buffer. Handle this. */ | |
| 625 assert (elt >= 0); | |
| 626 | |
| 627 /* Moving downward. */ | |
| 628 if (vtarget > 0) | |
| 629 { | |
| 630 int cur_line = Dynarr_length (w->line_start_cache) - 1 - elt; | |
| 665 | 631 Charbpos ret_pt; |
| 428 | 632 |
| 633 if (cur_line > vtarget) | |
| 634 cur_line = vtarget; | |
| 635 | |
| 636 /* The traditional FSF behavior is to return the end of buffer | |
| 637 position if we couldn't move far enough because we hit it. */ | |
| 638 if (cur_line < vtarget) | |
| 639 ret_pt = BUF_ZV (b); | |
| 640 else | |
| 641 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start; | |
| 642 | |
| 643 while (ret_pt > BUF_ZV (b) && cur_line > 0) | |
| 644 { | |
| 645 cur_line--; | |
| 646 ret_pt = Dynarr_atp (w->line_start_cache, cur_line + elt)->start; | |
| 647 } | |
| 648 | |
| 649 if (ret_vpos) *ret_vpos = cur_line; | |
| 650 if (ret_vpix) | |
| 651 *ret_vpix = vpix_motion (w->line_start_cache, elt, cur_line + elt); | |
| 652 return ret_pt; | |
| 653 } | |
| 654 else if (vtarget < 0) | |
| 655 { | |
| 656 if (elt < -vtarget) | |
| 657 { | |
| 658 if (ret_vpos) *ret_vpos = -elt; | |
| 659 if (ret_vpix) | |
| 660 *ret_vpix = vpix_motion (w->line_start_cache, 0, elt); | |
| 661 /* #### This should be BUF_BEGV (b), right? */ | |
| 4967 | 662 return Dynarr_begin (w->line_start_cache)->start; |
| 428 | 663 } |
| 664 else | |
| 665 { | |
| 666 if (ret_vpos) *ret_vpos = vtarget; | |
| 667 if (ret_vpix) | |
| 668 *ret_vpix = vpix_motion (w->line_start_cache, elt + vtarget, elt); | |
| 669 return Dynarr_atp (w->line_start_cache, elt + vtarget)->start; | |
| 670 } | |
| 671 } | |
| 672 else | |
| 673 { | |
| 674 /* No vertical motion requested so we just return the position | |
| 675 of the beginning of the current line. */ | |
| 676 if (ret_vpos) *ret_vpos = 0; | |
| 677 if (ret_vpix) | |
| 678 *ret_vpix = vpix_motion (w->line_start_cache, elt, elt); | |
| 679 | |
| 680 return Dynarr_atp (w->line_start_cache, elt)->start; | |
| 681 } | |
| 682 | |
| 1204 | 683 RETURN_NOT_REACHED(0); /* shut up compiler */ |
| 428 | 684 } |
| 685 | |
| 686 /***************************************************************************** | |
| 687 vmotion | |
| 688 | |
| 689 Given a starting position ORIG, move point VTARGET lines in WINDOW. | |
| 690 Returns the new value for point. If the arg ret_vpos is not nil, it is | |
| 691 taken to be a pointer to an int and the number of lines actually moved is | |
| 692 returned in it. | |
| 693 ****************************************************************************/ | |
| 665 | 694 Charbpos |
| 695 vmotion (struct window *w, Charbpos orig, int vtarget, int *ret_vpos) | |
| 428 | 696 { |
| 697 return vmotion_1 (w, orig, vtarget, ret_vpos, NULL); | |
| 698 } | |
| 699 | |
| 700 /* Helper for Fvertical_motion. | |
| 701 */ | |
| 702 static | |
| 703 Lisp_Object vertical_motion_1 (Lisp_Object lines, Lisp_Object window, | |
| 704 int pixels) | |
| 705 { | |
| 665 | 706 Charbpos charbpos; |
| 707 Charbpos orig; | |
| 428 | 708 int selected; |
| 709 int *vpos, *vpix; | |
| 710 int value=0; | |
| 711 struct window *w; | |
| 712 | |
| 713 if (NILP (window)) | |
| 714 window = Fselected_window (Qnil); | |
| 715 | |
| 716 CHECK_LIVE_WINDOW (window); | |
| 717 CHECK_INT (lines); | |
| 718 | |
| 719 selected = (EQ (window, Fselected_window (Qnil))); | |
| 720 | |
| 721 w = XWINDOW (window); | |
| 722 | |
| 723 orig = selected ? BUF_PT (XBUFFER (w->buffer)) | |
| 724 : marker_position (w->pointm[CURRENT_DISP]); | |
| 725 | |
| 726 vpos = pixels ? NULL : &value; | |
| 727 vpix = pixels ? &value : NULL; | |
| 728 | |
| 665 | 729 charbpos = vmotion_1 (w, orig, XINT (lines), vpos, vpix); |
| 428 | 730 |
| 731 /* Note that the buffer's point is set, not the window's point. */ | |
| 732 if (selected) | |
| 665 | 733 BUF_SET_PT (XBUFFER (w->buffer), charbpos); |
| 428 | 734 else |
| 735 set_marker_restricted (w->pointm[CURRENT_DISP], | |
| 665 | 736 make_int(charbpos), |
| 428 | 737 w->buffer); |
| 738 | |
| 739 return make_int (value); | |
| 740 } | |
| 741 | |
| 742 DEFUN ("vertical-motion", Fvertical_motion, 1, 3, 0, /* | |
| 743 Move to start of frame line LINES lines down. | |
| 744 If LINES is negative, this is moving up. | |
| 745 Optional second argument is WINDOW to move in, | |
| 746 the default is the selected window. | |
| 747 | |
| 748 Sets point to position found; this may be start of line | |
| 749 or just the start of a continuation line. | |
| 750 If optional third argument PIXELS is nil, returns number | |
| 751 of lines moved; may be closer to zero than LINES if beginning | |
| 752 or end of buffer was reached. If PIXELS is non-nil, the | |
| 753 vertical pixel height of the motion which took place is | |
| 754 returned instead of the actual number of lines moved. A | |
| 755 motion of zero lines returns the height of the current line. | |
| 756 | |
| 1268 | 757 NOTE NOTE NOTE: GNU Emacs/XEmacs difference. |
| 758 | |
| 759 What `vertical-motion' actually does is set WINDOW's buffer's point | |
| 760 if WINDOW is the selected window; else, it sets WINDOW's point. | |
| 761 This is unfortunately somewhat tricky to work with, and different | |
| 762 from GNU Emacs, which always uses the current buffer, not WINDOW's | |
| 763 buffer, always sets current buffer's point, and, from the | |
| 764 perspective of this function, temporarily makes WINDOW display | |
| 765 the current buffer if it wasn't already. | |
| 428 | 766 */ |
| 767 (lines, window, pixels)) | |
| 768 { | |
| 769 return vertical_motion_1 (lines, window, !NILP (pixels)); | |
| 770 } | |
| 771 | |
| 772 /* | |
| 773 * Like vmotion() but requested and returned movement is in pixels. | |
| 774 * HOW specifies the stopping condition. Positive means move at least | |
| 775 * PIXELS. Negative means at most. Zero means as close as possible. | |
| 776 */ | |
| 665 | 777 Charbpos |
| 778 vmotion_pixels (Lisp_Object window, Charbpos start, int pixels, int how, | |
| 428 | 779 int *motion) |
| 780 { | |
| 781 struct window *w; | |
| 665 | 782 Charbpos eobuf, bobuf; |
| 428 | 783 int defheight; |
| 784 int needed; | |
| 785 int line, next; | |
| 786 int remain, abspix, dirn; | |
| 787 int elt, nelt; | |
| 788 int i; | |
| 789 line_start_cache_dynarr *cache; | |
| 790 int previous = -1; | |
| 791 int lines; | |
| 792 | |
| 793 if (NILP (window)) | |
| 794 window = Fselected_window (Qnil); | |
| 795 | |
| 796 CHECK_LIVE_WINDOW (window); | |
| 797 w = XWINDOW (window); | |
| 798 | |
| 799 eobuf = BUF_ZV (XBUFFER (w->buffer)); | |
| 800 bobuf = BUF_BEGV (XBUFFER (w->buffer)); | |
| 801 | |
|
5047
07dcc7000bbf
put width before height consistently, fix a real bug found in the process
Ben Wing <ben@xemacs.org>
parents:
4998
diff
changeset
|
802 default_face_width_and_height (window, NULL, &defheight); |
| 428 | 803 |
| 804 /* guess num lines needed in line start cache + a few extra */ | |
| 805 abspix = abs (pixels); | |
| 806 needed = (abspix + defheight-1)/defheight + 3; | |
| 807 | |
| 808 dirn = (pixels >= 0) ? 1 : -1; | |
| 809 | |
| 810 while (1) | |
| 811 { | |
| 812 elt = point_in_line_start_cache (w, start, needed); | |
| 813 assert (elt >= 0); /* in the cache */ | |
| 814 | |
| 815 cache = w->line_start_cache; | |
| 816 nelt = Dynarr_length (cache); | |
| 817 | |
| 818 *motion = 0; | |
| 819 | |
| 820 if (pixels == 0) | |
| 821 /* No vertical motion requested so we just return the position | |
| 822 of the beginning of the current display line. */ | |
| 823 return Dynarr_atp (cache, elt)->start; | |
| 824 | |
| 825 if ((dirn < 0 && elt == 0 && | |
| 826 Dynarr_atp (cache, elt)->start <= bobuf) || | |
| 827 (dirn > 0 && elt == nelt-1 && | |
| 828 Dynarr_atp (cache, elt)->end >= eobuf)) | |
| 829 return Dynarr_atp (cache, elt)->start; | |
| 830 | |
| 831 remain = abspix; | |
| 832 for (i = elt; (dirn > 0) ? (i < nelt) : (i > 0); i += dirn) | |
| 833 { | |
| 834 /* cache line we're considering moving over */ | |
| 835 int ii = (dirn > 0) ? i : i-1; | |
| 836 | |
| 837 if (remain < 0) | |
| 838 return Dynarr_atp (cache, i)->start; | |
| 839 | |
| 840 line = Dynarr_atp (cache, ii)->height; | |
| 841 next = remain - line; | |
| 842 | |
| 843 /* is stopping condition satisfied? */ | |
| 844 if ((how > 0 && remain <= 0) || /* at least */ | |
| 845 (how < 0 && next < 0) || /* at most */ | |
| 846 (how == 0 && remain <= abs (next))) /* closest */ | |
| 847 return Dynarr_atp (cache, i)->start; | |
| 848 | |
| 849 /* moving down and nowhere left to go? */ | |
| 850 if (dirn > 0 && Dynarr_atp (cache, ii)->end >= eobuf) | |
| 851 return Dynarr_atp (cache, ii)->start; | |
| 852 | |
| 853 /* take the step */ | |
| 854 remain = next; | |
| 855 *motion += dirn * line; | |
| 856 | |
| 857 /* moving up and nowhere left to go? */ | |
| 858 if (dirn < 0 && Dynarr_atp (cache, ii)->start <= bobuf) | |
| 859 return Dynarr_atp (cache, ii)->start; | |
| 860 } | |
| 861 | |
| 862 /* get here => need more cache lines. try again. */ | |
| 863 assert (abs (*motion) > previous); /* progress? */ | |
| 864 previous = abs (*motion); | |
| 865 | |
| 866 lines = (pixels < 0) ? elt : (nelt - elt); | |
| 867 needed += (remain*lines + abspix-1)/abspix + 3; | |
| 868 } | |
| 869 | |
| 1204 | 870 RETURN_NOT_REACHED(0); /* shut up compiler */ |
| 428 | 871 } |
| 872 | |
| 873 DEFUN ("vertical-motion-pixels", Fvertical_motion_pixels, 1, 3, 0, /* | |
| 874 Move to start of frame line PIXELS vertical pixels down. | |
| 875 If PIXELS is negative, this is moving up. | |
| 876 The actual vertical motion in pixels is returned. | |
| 877 | |
| 878 Optional second argument is WINDOW to move in, | |
| 879 the default is the selected window. | |
| 880 | |
| 881 Optional third argument HOW specifies when to stop. A value | |
| 882 less than zero indicates that the motion should be no more | |
| 883 than PIXELS. A value greater than zero indicates that the | |
| 884 motion should be at least PIXELS. Any other value indicates | |
| 885 that the motion should be as close as possible to PIXELS. | |
| 886 */ | |
| 887 (pixels, window, how)) | |
| 888 { | |
| 665 | 889 Charbpos charbpos; |
| 890 Charbpos orig; | |
| 428 | 891 int selected; |
| 892 int motion; | |
| 893 int howto; | |
| 894 struct window *w; | |
| 895 | |
| 896 if (NILP (window)) | |
| 897 window = Fselected_window (Qnil); | |
| 898 | |
| 899 CHECK_LIVE_WINDOW (window); | |
| 900 CHECK_INT (pixels); | |
| 901 | |
| 902 selected = (EQ (window, Fselected_window (Qnil))); | |
| 903 | |
| 904 w = XWINDOW (window); | |
| 905 | |
| 906 orig = selected ? BUF_PT (XBUFFER (w->buffer)) | |
| 907 : marker_position (w->pointm[CURRENT_DISP]); | |
| 908 | |
| 909 howto = INTP (how) ? XINT (how) : 0; | |
| 910 | |
| 665 | 911 charbpos = vmotion_pixels (window, orig, XINT (pixels), howto, &motion); |
| 428 | 912 |
| 913 if (selected) | |
| 665 | 914 BUF_SET_PT (XBUFFER (w->buffer), charbpos); |
| 428 | 915 else |
| 916 set_marker_restricted (w->pointm[CURRENT_DISP], | |
| 665 | 917 make_int(charbpos), |
| 428 | 918 w->buffer); |
| 919 | |
| 920 return make_int (motion); | |
| 921 } | |
| 922 | |
| 923 | |
| 924 void | |
| 925 syms_of_indent (void) | |
| 926 { | |
| 927 DEFSUBR (Fcurrent_indentation); | |
| 928 DEFSUBR (Findent_to); | |
| 929 DEFSUBR (Fcurrent_column); | |
| 930 DEFSUBR (Fmove_to_column); | |
| 931 #if 0 /* #### */ | |
| 932 DEFSUBR (Fcompute_motion); | |
| 933 #endif | |
| 934 DEFSUBR (Fvertical_motion); | |
| 935 DEFSUBR (Fvertical_motion_pixels); | |
| 936 } | |
| 937 | |
| 938 void | |
| 939 vars_of_indent (void) | |
| 940 { | |
| 941 DEFVAR_BOOL ("indent-tabs-mode", &indent_tabs_mode /* | |
| 942 *Indentation can insert tabs if this is non-nil. | |
| 943 Setting this variable automatically makes it local to the current buffer. | |
| 944 */ ); | |
| 945 indent_tabs_mode = 1; | |
| 946 } |