| 1 | /* Buffer insertion/deletion and gap motion for GNU Emacs. |
| 2 | Copyright (C) 1985-1986, 1993-1995, 1997-2014 Free Software |
| 3 | Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software: you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | |
| 21 | #include <config.h> |
| 22 | |
| 23 | #include <intprops.h> |
| 24 | |
| 25 | #include "lisp.h" |
| 26 | #include "intervals.h" |
| 27 | #include "character.h" |
| 28 | #include "buffer.h" |
| 29 | #include "window.h" |
| 30 | #include "blockinput.h" |
| 31 | #include "region-cache.h" |
| 32 | |
| 33 | static void insert_from_string_1 (Lisp_Object, ptrdiff_t, ptrdiff_t, ptrdiff_t, |
| 34 | ptrdiff_t, bool, bool); |
| 35 | static void insert_from_buffer_1 (struct buffer *, ptrdiff_t, ptrdiff_t, bool); |
| 36 | static void gap_left (ptrdiff_t, ptrdiff_t, bool); |
| 37 | static void gap_right (ptrdiff_t, ptrdiff_t); |
| 38 | |
| 39 | /* List of elements of the form (BEG-UNCHANGED END-UNCHANGED CHANGE-AMOUNT) |
| 40 | describing changes which happened while combine_after_change_calls |
| 41 | was non-nil. We use this to decide how to call them |
| 42 | once the deferral ends. |
| 43 | |
| 44 | In each element. |
| 45 | BEG-UNCHANGED is the number of chars before the changed range. |
| 46 | END-UNCHANGED is the number of chars after the changed range, |
| 47 | and CHANGE-AMOUNT is the number of characters inserted by the change |
| 48 | (negative for a deletion). */ |
| 49 | static Lisp_Object combine_after_change_list; |
| 50 | |
| 51 | /* Buffer which combine_after_change_list is about. */ |
| 52 | static Lisp_Object combine_after_change_buffer; |
| 53 | |
| 54 | Lisp_Object Qinhibit_modification_hooks; |
| 55 | |
| 56 | static void signal_before_change (ptrdiff_t, ptrdiff_t, ptrdiff_t *); |
| 57 | |
| 58 | /* Also used in marker.c to enable expensive marker checks. */ |
| 59 | |
| 60 | #ifdef MARKER_DEBUG |
| 61 | |
| 62 | static void |
| 63 | check_markers (void) |
| 64 | { |
| 65 | struct Lisp_Marker *tail; |
| 66 | bool multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); |
| 67 | |
| 68 | for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) |
| 69 | { |
| 70 | if (tail->buffer->text != current_buffer->text) |
| 71 | emacs_abort (); |
| 72 | if (tail->charpos > Z) |
| 73 | emacs_abort (); |
| 74 | if (tail->bytepos > Z_BYTE) |
| 75 | emacs_abort (); |
| 76 | if (multibyte && ! CHAR_HEAD_P (FETCH_BYTE (tail->bytepos))) |
| 77 | emacs_abort (); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | #else /* not MARKER_DEBUG */ |
| 82 | |
| 83 | #define check_markers() do { } while (0) |
| 84 | |
| 85 | #endif /* MARKER_DEBUG */ |
| 86 | |
| 87 | /* Move gap to byte position BYTEPOS, which is also char position CHARPOS. |
| 88 | Note that this can quit! */ |
| 89 | |
| 90 | void |
| 91 | move_gap_both (ptrdiff_t charpos, ptrdiff_t bytepos) |
| 92 | { |
| 93 | eassert (charpos == BYTE_TO_CHAR (bytepos) |
| 94 | && bytepos == CHAR_TO_BYTE (charpos)); |
| 95 | if (bytepos < GPT_BYTE) |
| 96 | gap_left (charpos, bytepos, 0); |
| 97 | else if (bytepos > GPT_BYTE) |
| 98 | gap_right (charpos, bytepos); |
| 99 | } |
| 100 | |
| 101 | /* Move the gap to a position less than the current GPT. |
| 102 | BYTEPOS describes the new position as a byte position, |
| 103 | and CHARPOS is the corresponding char position. |
| 104 | If NEWGAP, then don't update beg_unchanged and end_unchanged. */ |
| 105 | |
| 106 | static void |
| 107 | gap_left (ptrdiff_t charpos, ptrdiff_t bytepos, bool newgap) |
| 108 | { |
| 109 | unsigned char *to, *from; |
| 110 | ptrdiff_t i; |
| 111 | ptrdiff_t new_s1; |
| 112 | |
| 113 | if (!newgap) |
| 114 | BUF_COMPUTE_UNCHANGED (current_buffer, charpos, GPT); |
| 115 | |
| 116 | i = GPT_BYTE; |
| 117 | to = GAP_END_ADDR; |
| 118 | from = GPT_ADDR; |
| 119 | new_s1 = GPT_BYTE; |
| 120 | |
| 121 | /* Now copy the characters. To move the gap down, |
| 122 | copy characters up. */ |
| 123 | |
| 124 | while (1) |
| 125 | { |
| 126 | /* I gets number of characters left to copy. */ |
| 127 | i = new_s1 - bytepos; |
| 128 | if (i == 0) |
| 129 | break; |
| 130 | /* If a quit is requested, stop copying now. |
| 131 | Change BYTEPOS to be where we have actually moved the gap to. */ |
| 132 | if (QUITP) |
| 133 | { |
| 134 | bytepos = new_s1; |
| 135 | charpos = BYTE_TO_CHAR (bytepos); |
| 136 | break; |
| 137 | } |
| 138 | /* Move at most 32000 chars before checking again for a quit. */ |
| 139 | if (i > 32000) |
| 140 | i = 32000; |
| 141 | new_s1 -= i; |
| 142 | from -= i, to -= i; |
| 143 | memmove (to, from, i); |
| 144 | } |
| 145 | |
| 146 | /* Adjust buffer data structure, to put the gap at BYTEPOS. |
| 147 | BYTEPOS is where the loop above stopped, which may be what |
| 148 | was specified or may be where a quit was detected. */ |
| 149 | GPT_BYTE = bytepos; |
| 150 | GPT = charpos; |
| 151 | eassert (charpos <= bytepos); |
| 152 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 153 | QUIT; |
| 154 | } |
| 155 | |
| 156 | /* Move the gap to a position greater than the current GPT. |
| 157 | BYTEPOS describes the new position as a byte position, |
| 158 | and CHARPOS is the corresponding char position. */ |
| 159 | |
| 160 | static void |
| 161 | gap_right (ptrdiff_t charpos, ptrdiff_t bytepos) |
| 162 | { |
| 163 | register unsigned char *to, *from; |
| 164 | register ptrdiff_t i; |
| 165 | ptrdiff_t new_s1; |
| 166 | |
| 167 | BUF_COMPUTE_UNCHANGED (current_buffer, charpos, GPT); |
| 168 | |
| 169 | i = GPT_BYTE; |
| 170 | from = GAP_END_ADDR; |
| 171 | to = GPT_ADDR; |
| 172 | new_s1 = GPT_BYTE; |
| 173 | |
| 174 | /* Now copy the characters. To move the gap up, |
| 175 | copy characters down. */ |
| 176 | |
| 177 | while (1) |
| 178 | { |
| 179 | /* I gets number of characters left to copy. */ |
| 180 | i = bytepos - new_s1; |
| 181 | if (i == 0) |
| 182 | break; |
| 183 | /* If a quit is requested, stop copying now. |
| 184 | Change BYTEPOS to be where we have actually moved the gap to. */ |
| 185 | if (QUITP) |
| 186 | { |
| 187 | bytepos = new_s1; |
| 188 | charpos = BYTE_TO_CHAR (bytepos); |
| 189 | break; |
| 190 | } |
| 191 | /* Move at most 32000 chars before checking again for a quit. */ |
| 192 | if (i > 32000) |
| 193 | i = 32000; |
| 194 | new_s1 += i; |
| 195 | memmove (to, from, i); |
| 196 | from += i, to += i; |
| 197 | } |
| 198 | |
| 199 | GPT = charpos; |
| 200 | GPT_BYTE = bytepos; |
| 201 | eassert (charpos <= bytepos); |
| 202 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 203 | QUIT; |
| 204 | } |
| 205 | \f |
| 206 | /* Adjust all markers for a deletion |
| 207 | whose range in bytes is FROM_BYTE to TO_BYTE. |
| 208 | The range in charpos is FROM to TO. |
| 209 | |
| 210 | This function assumes that the gap is adjacent to |
| 211 | or inside of the range being deleted. */ |
| 212 | |
| 213 | void |
| 214 | adjust_markers_for_delete (ptrdiff_t from, ptrdiff_t from_byte, |
| 215 | ptrdiff_t to, ptrdiff_t to_byte) |
| 216 | { |
| 217 | Lisp_Object marker; |
| 218 | register struct Lisp_Marker *m; |
| 219 | register ptrdiff_t charpos; |
| 220 | |
| 221 | for (m = BUF_MARKERS (current_buffer); m; m = m->next) |
| 222 | { |
| 223 | charpos = m->charpos; |
| 224 | eassert (charpos <= Z); |
| 225 | |
| 226 | /* If the marker is after the deletion, |
| 227 | relocate by number of chars / bytes deleted. */ |
| 228 | if (charpos > to) |
| 229 | { |
| 230 | m->charpos -= to - from; |
| 231 | m->bytepos -= to_byte - from_byte; |
| 232 | } |
| 233 | /* Here's the case where a marker is inside text being deleted. */ |
| 234 | else if (charpos > from) |
| 235 | { |
| 236 | if (! m->insertion_type) |
| 237 | { /* Normal markers will end up at the beginning of the |
| 238 | re-inserted text after undoing a deletion, and must be |
| 239 | adjusted to move them to the correct place. */ |
| 240 | XSETMISC (marker, m); |
| 241 | record_marker_adjustment (marker, from - charpos); |
| 242 | } |
| 243 | else if (charpos < to) |
| 244 | { /* Before-insertion markers will automatically move forward |
| 245 | upon re-inserting the deleted text, so we have to arrange |
| 246 | for them to move backward to the correct position. */ |
| 247 | XSETMISC (marker, m); |
| 248 | record_marker_adjustment (marker, to - charpos); |
| 249 | } |
| 250 | m->charpos = from; |
| 251 | m->bytepos = from_byte; |
| 252 | } |
| 253 | /* Here's the case where a before-insertion marker is immediately |
| 254 | before the deleted region. */ |
| 255 | else if (charpos == from && m->insertion_type) |
| 256 | { |
| 257 | /* Undoing the change uses normal insertion, which will |
| 258 | incorrectly make MARKER move forward, so we arrange for it |
| 259 | to then move backward to the correct place at the beginning |
| 260 | of the deleted region. */ |
| 261 | XSETMISC (marker, m); |
| 262 | record_marker_adjustment (marker, to - from); |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | \f |
| 268 | /* Adjust markers for an insertion that stretches from FROM / FROM_BYTE |
| 269 | to TO / TO_BYTE. We have to relocate the charpos of every marker |
| 270 | that points after the insertion (but not their bytepos). |
| 271 | |
| 272 | When a marker points at the insertion point, |
| 273 | we advance it if either its insertion-type is t |
| 274 | or BEFORE_MARKERS is true. */ |
| 275 | |
| 276 | static void |
| 277 | adjust_markers_for_insert (ptrdiff_t from, ptrdiff_t from_byte, |
| 278 | ptrdiff_t to, ptrdiff_t to_byte, bool before_markers) |
| 279 | { |
| 280 | struct Lisp_Marker *m; |
| 281 | bool adjusted = 0; |
| 282 | ptrdiff_t nchars = to - from; |
| 283 | ptrdiff_t nbytes = to_byte - from_byte; |
| 284 | |
| 285 | for (m = BUF_MARKERS (current_buffer); m; m = m->next) |
| 286 | { |
| 287 | eassert (m->bytepos >= m->charpos |
| 288 | && m->bytepos - m->charpos <= Z_BYTE - Z); |
| 289 | |
| 290 | if (m->bytepos == from_byte) |
| 291 | { |
| 292 | if (m->insertion_type || before_markers) |
| 293 | { |
| 294 | m->bytepos = to_byte; |
| 295 | m->charpos = to; |
| 296 | if (m->insertion_type) |
| 297 | adjusted = 1; |
| 298 | } |
| 299 | } |
| 300 | else if (m->bytepos > from_byte) |
| 301 | { |
| 302 | m->bytepos += nbytes; |
| 303 | m->charpos += nchars; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /* Adjusting only markers whose insertion-type is t may result in |
| 308 | - disordered start and end in overlays, and |
| 309 | - disordered overlays in the slot `overlays_before' of current_buffer. */ |
| 310 | if (adjusted) |
| 311 | { |
| 312 | fix_start_end_in_overlays (from, to); |
| 313 | fix_overlays_before (current_buffer, from, to); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | /* Adjust point for an insertion of NBYTES bytes, which are NCHARS characters. |
| 318 | |
| 319 | This is used only when the value of point changes due to an insert |
| 320 | or delete; it does not represent a conceptual change in point as a |
| 321 | marker. In particular, point is not crossing any interval |
| 322 | boundaries, so there's no need to use the usual SET_PT macro. In |
| 323 | fact it would be incorrect to do so, because either the old or the |
| 324 | new value of point is out of sync with the current set of |
| 325 | intervals. */ |
| 326 | |
| 327 | static void |
| 328 | adjust_point (ptrdiff_t nchars, ptrdiff_t nbytes) |
| 329 | { |
| 330 | SET_BUF_PT_BOTH (current_buffer, PT + nchars, PT_BYTE + nbytes); |
| 331 | /* In a single-byte buffer, the two positions must be equal. */ |
| 332 | eassert (PT_BYTE >= PT && PT_BYTE - PT <= ZV_BYTE - ZV); |
| 333 | } |
| 334 | \f |
| 335 | /* Adjust markers for a replacement of a text at FROM (FROM_BYTE) of |
| 336 | length OLD_CHARS (OLD_BYTES) to a new text of length NEW_CHARS |
| 337 | (NEW_BYTES). It is assumed that OLD_CHARS > 0, i.e., this is not |
| 338 | an insertion. */ |
| 339 | |
| 340 | static void |
| 341 | adjust_markers_for_replace (ptrdiff_t from, ptrdiff_t from_byte, |
| 342 | ptrdiff_t old_chars, ptrdiff_t old_bytes, |
| 343 | ptrdiff_t new_chars, ptrdiff_t new_bytes) |
| 344 | { |
| 345 | register struct Lisp_Marker *m; |
| 346 | ptrdiff_t prev_to_byte = from_byte + old_bytes; |
| 347 | ptrdiff_t diff_chars = new_chars - old_chars; |
| 348 | ptrdiff_t diff_bytes = new_bytes - old_bytes; |
| 349 | |
| 350 | for (m = BUF_MARKERS (current_buffer); m; m = m->next) |
| 351 | { |
| 352 | if (m->bytepos >= prev_to_byte) |
| 353 | { |
| 354 | m->charpos += diff_chars; |
| 355 | m->bytepos += diff_bytes; |
| 356 | } |
| 357 | else if (m->bytepos > from_byte) |
| 358 | { |
| 359 | m->charpos = from; |
| 360 | m->bytepos = from_byte; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | check_markers (); |
| 365 | } |
| 366 | |
| 367 | \f |
| 368 | void |
| 369 | buffer_overflow (void) |
| 370 | { |
| 371 | error ("Maximum buffer size exceeded"); |
| 372 | } |
| 373 | |
| 374 | /* Make the gap NBYTES_ADDED bytes longer. */ |
| 375 | |
| 376 | static void |
| 377 | make_gap_larger (ptrdiff_t nbytes_added) |
| 378 | { |
| 379 | Lisp_Object tem; |
| 380 | ptrdiff_t real_gap_loc; |
| 381 | ptrdiff_t real_gap_loc_byte; |
| 382 | ptrdiff_t old_gap_size; |
| 383 | ptrdiff_t current_size = Z_BYTE - BEG_BYTE + GAP_SIZE; |
| 384 | |
| 385 | if (BUF_BYTES_MAX - current_size < nbytes_added) |
| 386 | buffer_overflow (); |
| 387 | |
| 388 | /* If we have to get more space, get enough to last a while; |
| 389 | but do not exceed the maximum buffer size. */ |
| 390 | nbytes_added = min (nbytes_added + GAP_BYTES_DFL, |
| 391 | BUF_BYTES_MAX - current_size); |
| 392 | |
| 393 | enlarge_buffer_text (current_buffer, nbytes_added); |
| 394 | |
| 395 | /* Prevent quitting in move_gap. */ |
| 396 | tem = Vinhibit_quit; |
| 397 | Vinhibit_quit = Qt; |
| 398 | |
| 399 | real_gap_loc = GPT; |
| 400 | real_gap_loc_byte = GPT_BYTE; |
| 401 | old_gap_size = GAP_SIZE; |
| 402 | |
| 403 | /* Call the newly allocated space a gap at the end of the whole space. */ |
| 404 | GPT = Z + GAP_SIZE; |
| 405 | GPT_BYTE = Z_BYTE + GAP_SIZE; |
| 406 | GAP_SIZE = nbytes_added; |
| 407 | |
| 408 | /* Move the new gap down to be consecutive with the end of the old one. */ |
| 409 | gap_left (real_gap_loc + old_gap_size, real_gap_loc_byte + old_gap_size, 1); |
| 410 | |
| 411 | /* Now combine the two into one large gap. */ |
| 412 | GAP_SIZE += old_gap_size; |
| 413 | GPT = real_gap_loc; |
| 414 | GPT_BYTE = real_gap_loc_byte; |
| 415 | |
| 416 | /* Put an anchor. */ |
| 417 | *(Z_ADDR) = 0; |
| 418 | |
| 419 | Vinhibit_quit = tem; |
| 420 | } |
| 421 | |
| 422 | #if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC |
| 423 | |
| 424 | /* Make the gap NBYTES_REMOVED bytes shorter. */ |
| 425 | |
| 426 | static void |
| 427 | make_gap_smaller (ptrdiff_t nbytes_removed) |
| 428 | { |
| 429 | Lisp_Object tem; |
| 430 | ptrdiff_t real_gap_loc; |
| 431 | ptrdiff_t real_gap_loc_byte; |
| 432 | ptrdiff_t real_Z; |
| 433 | ptrdiff_t real_Z_byte; |
| 434 | ptrdiff_t real_beg_unchanged; |
| 435 | ptrdiff_t new_gap_size; |
| 436 | |
| 437 | /* Make sure the gap is at least GAP_BYTES_MIN bytes. */ |
| 438 | if (GAP_SIZE - nbytes_removed < GAP_BYTES_MIN) |
| 439 | nbytes_removed = GAP_SIZE - GAP_BYTES_MIN; |
| 440 | |
| 441 | /* Prevent quitting in move_gap. */ |
| 442 | tem = Vinhibit_quit; |
| 443 | Vinhibit_quit = Qt; |
| 444 | |
| 445 | real_gap_loc = GPT; |
| 446 | real_gap_loc_byte = GPT_BYTE; |
| 447 | new_gap_size = GAP_SIZE - nbytes_removed; |
| 448 | real_Z = Z; |
| 449 | real_Z_byte = Z_BYTE; |
| 450 | real_beg_unchanged = BEG_UNCHANGED; |
| 451 | |
| 452 | /* Pretend that the last unwanted part of the gap is the entire gap, |
| 453 | and that the first desired part of the gap is part of the buffer |
| 454 | text. */ |
| 455 | memset (GPT_ADDR, 0, new_gap_size); |
| 456 | GPT += new_gap_size; |
| 457 | GPT_BYTE += new_gap_size; |
| 458 | Z += new_gap_size; |
| 459 | Z_BYTE += new_gap_size; |
| 460 | GAP_SIZE = nbytes_removed; |
| 461 | |
| 462 | /* Move the unwanted pretend gap to the end of the buffer. */ |
| 463 | gap_right (Z, Z_BYTE); |
| 464 | |
| 465 | enlarge_buffer_text (current_buffer, -nbytes_removed); |
| 466 | |
| 467 | /* Now restore the desired gap. */ |
| 468 | GAP_SIZE = new_gap_size; |
| 469 | GPT = real_gap_loc; |
| 470 | GPT_BYTE = real_gap_loc_byte; |
| 471 | Z = real_Z; |
| 472 | Z_BYTE = real_Z_byte; |
| 473 | BEG_UNCHANGED = real_beg_unchanged; |
| 474 | |
| 475 | /* Put an anchor. */ |
| 476 | *(Z_ADDR) = 0; |
| 477 | |
| 478 | Vinhibit_quit = tem; |
| 479 | } |
| 480 | |
| 481 | #endif /* USE_MMAP_FOR_BUFFERS || REL_ALLOC || DOUG_LEA_MALLOC */ |
| 482 | |
| 483 | void |
| 484 | make_gap (ptrdiff_t nbytes_added) |
| 485 | { |
| 486 | if (nbytes_added >= 0) |
| 487 | make_gap_larger (nbytes_added); |
| 488 | #if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC |
| 489 | else |
| 490 | make_gap_smaller (-nbytes_added); |
| 491 | #endif |
| 492 | } |
| 493 | |
| 494 | /* Add NBYTES to B's gap. It's enough to temporarily |
| 495 | fake current_buffer and avoid real switch to B. */ |
| 496 | |
| 497 | void |
| 498 | make_gap_1 (struct buffer *b, ptrdiff_t nbytes) |
| 499 | { |
| 500 | struct buffer *oldb = current_buffer; |
| 501 | |
| 502 | current_buffer = b; |
| 503 | make_gap (nbytes); |
| 504 | current_buffer = oldb; |
| 505 | } |
| 506 | |
| 507 | /* Copy NBYTES bytes of text from FROM_ADDR to TO_ADDR. |
| 508 | FROM_MULTIBYTE says whether the incoming text is multibyte. |
| 509 | TO_MULTIBYTE says whether to store the text as multibyte. |
| 510 | If FROM_MULTIBYTE != TO_MULTIBYTE, we convert. |
| 511 | |
| 512 | Return the number of bytes stored at TO_ADDR. */ |
| 513 | |
| 514 | ptrdiff_t |
| 515 | copy_text (const unsigned char *from_addr, unsigned char *to_addr, |
| 516 | ptrdiff_t nbytes, bool from_multibyte, bool to_multibyte) |
| 517 | { |
| 518 | if (from_multibyte == to_multibyte) |
| 519 | { |
| 520 | memcpy (to_addr, from_addr, nbytes); |
| 521 | return nbytes; |
| 522 | } |
| 523 | else if (from_multibyte) |
| 524 | { |
| 525 | ptrdiff_t nchars = 0; |
| 526 | ptrdiff_t bytes_left = nbytes; |
| 527 | |
| 528 | while (bytes_left > 0) |
| 529 | { |
| 530 | int thislen, c; |
| 531 | c = STRING_CHAR_AND_LENGTH (from_addr, thislen); |
| 532 | if (! ASCII_CHAR_P (c)) |
| 533 | c &= 0xFF; |
| 534 | *to_addr++ = c; |
| 535 | from_addr += thislen; |
| 536 | bytes_left -= thislen; |
| 537 | nchars++; |
| 538 | } |
| 539 | return nchars; |
| 540 | } |
| 541 | else |
| 542 | { |
| 543 | unsigned char *initial_to_addr = to_addr; |
| 544 | |
| 545 | /* Convert single-byte to multibyte. */ |
| 546 | while (nbytes > 0) |
| 547 | { |
| 548 | int c = *from_addr++; |
| 549 | |
| 550 | if (!ASCII_CHAR_P (c)) |
| 551 | { |
| 552 | c = BYTE8_TO_CHAR (c); |
| 553 | to_addr += CHAR_STRING (c, to_addr); |
| 554 | nbytes--; |
| 555 | } |
| 556 | else |
| 557 | /* Special case for speed. */ |
| 558 | *to_addr++ = c, nbytes--; |
| 559 | } |
| 560 | return to_addr - initial_to_addr; |
| 561 | } |
| 562 | } |
| 563 | \f |
| 564 | /* Insert a string of specified length before point. |
| 565 | This function judges multibyteness based on |
| 566 | enable_multibyte_characters in the current buffer; |
| 567 | it never converts between single-byte and multibyte. |
| 568 | |
| 569 | DO NOT use this for the contents of a Lisp string or a Lisp buffer! |
| 570 | prepare_to_modify_buffer could relocate the text. */ |
| 571 | |
| 572 | void |
| 573 | insert (const char *string, ptrdiff_t nbytes) |
| 574 | { |
| 575 | if (nbytes > 0) |
| 576 | { |
| 577 | ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint; |
| 578 | insert_1_both (string, len, nbytes, 0, 1, 0); |
| 579 | opoint = PT - len; |
| 580 | signal_after_change (opoint, 0, len); |
| 581 | update_compositions (opoint, PT, CHECK_BORDER); |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | /* Likewise, but inherit text properties from neighboring characters. */ |
| 586 | |
| 587 | void |
| 588 | insert_and_inherit (const char *string, ptrdiff_t nbytes) |
| 589 | { |
| 590 | if (nbytes > 0) |
| 591 | { |
| 592 | ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint; |
| 593 | insert_1_both (string, len, nbytes, 1, 1, 0); |
| 594 | opoint = PT - len; |
| 595 | signal_after_change (opoint, 0, len); |
| 596 | update_compositions (opoint, PT, CHECK_BORDER); |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | /* Insert the character C before point. Do not inherit text properties. */ |
| 601 | |
| 602 | void |
| 603 | insert_char (int c) |
| 604 | { |
| 605 | unsigned char str[MAX_MULTIBYTE_LENGTH]; |
| 606 | int len; |
| 607 | |
| 608 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 609 | len = CHAR_STRING (c, str); |
| 610 | else |
| 611 | { |
| 612 | len = 1; |
| 613 | str[0] = c; |
| 614 | } |
| 615 | |
| 616 | insert ((char *) str, len); |
| 617 | } |
| 618 | |
| 619 | /* Insert the null-terminated string S before point. */ |
| 620 | |
| 621 | void |
| 622 | insert_string (const char *s) |
| 623 | { |
| 624 | insert (s, strlen (s)); |
| 625 | } |
| 626 | |
| 627 | /* Like `insert' except that all markers pointing at the place where |
| 628 | the insertion happens are adjusted to point after it. |
| 629 | Don't use this function to insert part of a Lisp string, |
| 630 | since gc could happen and relocate it. */ |
| 631 | |
| 632 | void |
| 633 | insert_before_markers (const char *string, ptrdiff_t nbytes) |
| 634 | { |
| 635 | if (nbytes > 0) |
| 636 | { |
| 637 | ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint; |
| 638 | insert_1_both (string, len, nbytes, 0, 1, 1); |
| 639 | opoint = PT - len; |
| 640 | signal_after_change (opoint, 0, len); |
| 641 | update_compositions (opoint, PT, CHECK_BORDER); |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | /* Likewise, but inherit text properties from neighboring characters. */ |
| 646 | |
| 647 | void |
| 648 | insert_before_markers_and_inherit (const char *string, |
| 649 | ptrdiff_t nbytes) |
| 650 | { |
| 651 | if (nbytes > 0) |
| 652 | { |
| 653 | ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint; |
| 654 | insert_1_both (string, len, nbytes, 1, 1, 1); |
| 655 | opoint = PT - len; |
| 656 | signal_after_change (opoint, 0, len); |
| 657 | update_compositions (opoint, PT, CHECK_BORDER); |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | #ifdef BYTE_COMBINING_DEBUG |
| 662 | |
| 663 | /* See if the bytes before POS/POS_BYTE combine with bytes |
| 664 | at the start of STRING to form a single character. |
| 665 | If so, return the number of bytes at the start of STRING |
| 666 | which combine in this way. Otherwise, return 0. */ |
| 667 | |
| 668 | int |
| 669 | count_combining_before (const unsigned char *string, ptrdiff_t length, |
| 670 | ptrdiff_t pos, ptrdiff_t pos_byte) |
| 671 | { |
| 672 | int len, combining_bytes; |
| 673 | const unsigned char *p; |
| 674 | |
| 675 | if (NILP (current_buffer->enable_multibyte_characters)) |
| 676 | return 0; |
| 677 | |
| 678 | /* At first, we can exclude the following cases: |
| 679 | (1) STRING[0] can't be a following byte of multibyte sequence. |
| 680 | (2) POS is the start of the current buffer. |
| 681 | (3) A character before POS is not a multibyte character. */ |
| 682 | if (length == 0 || CHAR_HEAD_P (*string)) /* case (1) */ |
| 683 | return 0; |
| 684 | if (pos_byte == BEG_BYTE) /* case (2) */ |
| 685 | return 0; |
| 686 | len = 1; |
| 687 | p = BYTE_POS_ADDR (pos_byte - 1); |
| 688 | while (! CHAR_HEAD_P (*p)) p--, len++; |
| 689 | if (! LEADING_CODE_P (*p)) /* case (3) */ |
| 690 | return 0; |
| 691 | |
| 692 | combining_bytes = BYTES_BY_CHAR_HEAD (*p) - len; |
| 693 | if (combining_bytes <= 0) |
| 694 | /* The character preceding POS is, complete and no room for |
| 695 | combining bytes (combining_bytes == 0), or an independent 8-bit |
| 696 | character (combining_bytes < 0). */ |
| 697 | return 0; |
| 698 | |
| 699 | /* We have a combination situation. Count the bytes at STRING that |
| 700 | may combine. */ |
| 701 | p = string + 1; |
| 702 | while (!CHAR_HEAD_P (*p) && p < string + length) |
| 703 | p++; |
| 704 | |
| 705 | return (combining_bytes < p - string ? combining_bytes : p - string); |
| 706 | } |
| 707 | |
| 708 | /* See if the bytes after POS/POS_BYTE combine with bytes |
| 709 | at the end of STRING to form a single character. |
| 710 | If so, return the number of bytes after POS/POS_BYTE |
| 711 | which combine in this way. Otherwise, return 0. */ |
| 712 | |
| 713 | int |
| 714 | count_combining_after (const unsigned char *string, |
| 715 | ptrdiff_t length, ptrdiff_t pos, ptrdiff_t pos_byte) |
| 716 | { |
| 717 | ptrdiff_t opos_byte = pos_byte; |
| 718 | ptrdiff_t i; |
| 719 | ptrdiff_t bytes; |
| 720 | unsigned char *bufp; |
| 721 | |
| 722 | if (NILP (current_buffer->enable_multibyte_characters)) |
| 723 | return 0; |
| 724 | |
| 725 | /* At first, we can exclude the following cases: |
| 726 | (1) The last byte of STRING is an ASCII. |
| 727 | (2) POS is the last of the current buffer. |
| 728 | (3) A character at POS can't be a following byte of multibyte |
| 729 | character. */ |
| 730 | if (length > 0 && ASCII_BYTE_P (string[length - 1])) /* case (1) */ |
| 731 | return 0; |
| 732 | if (pos_byte == Z_BYTE) /* case (2) */ |
| 733 | return 0; |
| 734 | bufp = BYTE_POS_ADDR (pos_byte); |
| 735 | if (CHAR_HEAD_P (*bufp)) /* case (3) */ |
| 736 | return 0; |
| 737 | |
| 738 | i = length - 1; |
| 739 | while (i >= 0 && ! CHAR_HEAD_P (string[i])) |
| 740 | { |
| 741 | i--; |
| 742 | } |
| 743 | if (i < 0) |
| 744 | { |
| 745 | /* All characters in STRING are not character head. We must |
| 746 | check also preceding bytes at POS. We are sure that the gap |
| 747 | is at POS. */ |
| 748 | unsigned char *p = BEG_ADDR; |
| 749 | i = pos_byte - 2; |
| 750 | while (i >= 0 && ! CHAR_HEAD_P (p[i])) |
| 751 | i--; |
| 752 | if (i < 0 || !LEADING_CODE_P (p[i])) |
| 753 | return 0; |
| 754 | |
| 755 | bytes = BYTES_BY_CHAR_HEAD (p[i]); |
| 756 | return (bytes <= pos_byte - 1 - i + length |
| 757 | ? 0 |
| 758 | : bytes - (pos_byte - 1 - i + length)); |
| 759 | } |
| 760 | if (!LEADING_CODE_P (string[i])) |
| 761 | return 0; |
| 762 | |
| 763 | bytes = BYTES_BY_CHAR_HEAD (string[i]) - (length - i); |
| 764 | bufp++, pos_byte++; |
| 765 | while (!CHAR_HEAD_P (*bufp)) bufp++, pos_byte++; |
| 766 | |
| 767 | return (bytes <= pos_byte - opos_byte ? bytes : pos_byte - opos_byte); |
| 768 | } |
| 769 | |
| 770 | #endif |
| 771 | |
| 772 | \f |
| 773 | /* Insert a sequence of NCHARS chars which occupy NBYTES bytes |
| 774 | starting at STRING. INHERIT non-zero means inherit the text |
| 775 | properties from neighboring characters; zero means inserted text |
| 776 | will have no text properties. PREPARE non-zero means call |
| 777 | prepare_to_modify_buffer, which checks that the region is not |
| 778 | read-only, and calls before-change-function and any modification |
| 779 | properties the text may have. BEFORE_MARKERS non-zero means adjust |
| 780 | all markers that point at the insertion place to point after it. */ |
| 781 | |
| 782 | void |
| 783 | insert_1_both (const char *string, |
| 784 | ptrdiff_t nchars, ptrdiff_t nbytes, |
| 785 | bool inherit, bool prepare, bool before_markers) |
| 786 | { |
| 787 | if (nchars == 0) |
| 788 | return; |
| 789 | |
| 790 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 791 | nchars = nbytes; |
| 792 | |
| 793 | if (prepare) |
| 794 | /* Do this before moving and increasing the gap, |
| 795 | because the before-change hooks might move the gap |
| 796 | or make it smaller. */ |
| 797 | prepare_to_modify_buffer (PT, PT, NULL); |
| 798 | |
| 799 | if (PT != GPT) |
| 800 | move_gap_both (PT, PT_BYTE); |
| 801 | if (GAP_SIZE < nbytes) |
| 802 | make_gap (nbytes - GAP_SIZE); |
| 803 | |
| 804 | #ifdef BYTE_COMBINING_DEBUG |
| 805 | if (count_combining_before (string, nbytes, PT, PT_BYTE) |
| 806 | || count_combining_after (string, nbytes, PT, PT_BYTE)) |
| 807 | emacs_abort (); |
| 808 | #endif |
| 809 | |
| 810 | /* Record deletion of the surrounding text that combines with |
| 811 | the insertion. This, together with recording the insertion, |
| 812 | will add up to the right stuff in the undo list. */ |
| 813 | record_insert (PT, nchars); |
| 814 | MODIFF++; |
| 815 | CHARS_MODIFF = MODIFF; |
| 816 | |
| 817 | memcpy (GPT_ADDR, string, nbytes); |
| 818 | |
| 819 | GAP_SIZE -= nbytes; |
| 820 | GPT += nchars; |
| 821 | ZV += nchars; |
| 822 | Z += nchars; |
| 823 | GPT_BYTE += nbytes; |
| 824 | ZV_BYTE += nbytes; |
| 825 | Z_BYTE += nbytes; |
| 826 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 827 | |
| 828 | eassert (GPT <= GPT_BYTE); |
| 829 | |
| 830 | /* The insert may have been in the unchanged region, so check again. */ |
| 831 | if (Z - GPT < END_UNCHANGED) |
| 832 | END_UNCHANGED = Z - GPT; |
| 833 | |
| 834 | adjust_overlays_for_insert (PT, nchars); |
| 835 | adjust_markers_for_insert (PT, PT_BYTE, |
| 836 | PT + nchars, PT_BYTE + nbytes, |
| 837 | before_markers); |
| 838 | |
| 839 | offset_intervals (current_buffer, PT, nchars); |
| 840 | |
| 841 | if (!inherit && buffer_intervals (current_buffer)) |
| 842 | set_text_properties (make_number (PT), make_number (PT + nchars), |
| 843 | Qnil, Qnil, Qnil); |
| 844 | |
| 845 | adjust_point (nchars, nbytes); |
| 846 | |
| 847 | check_markers (); |
| 848 | } |
| 849 | \f |
| 850 | /* Insert the part of the text of STRING, a Lisp object assumed to be |
| 851 | of type string, consisting of the LENGTH characters (LENGTH_BYTE bytes) |
| 852 | starting at position POS / POS_BYTE. If the text of STRING has properties, |
| 853 | copy them into the buffer. |
| 854 | |
| 855 | It does not work to use `insert' for this, because a GC could happen |
| 856 | before we copy the stuff into the buffer, and relocate the string |
| 857 | without insert noticing. */ |
| 858 | |
| 859 | void |
| 860 | insert_from_string (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte, |
| 861 | ptrdiff_t length, ptrdiff_t length_byte, bool inherit) |
| 862 | { |
| 863 | ptrdiff_t opoint = PT; |
| 864 | |
| 865 | if (SCHARS (string) == 0) |
| 866 | return; |
| 867 | |
| 868 | insert_from_string_1 (string, pos, pos_byte, length, length_byte, |
| 869 | inherit, 0); |
| 870 | signal_after_change (opoint, 0, PT - opoint); |
| 871 | update_compositions (opoint, PT, CHECK_BORDER); |
| 872 | } |
| 873 | |
| 874 | /* Like `insert_from_string' except that all markers pointing |
| 875 | at the place where the insertion happens are adjusted to point after it. */ |
| 876 | |
| 877 | void |
| 878 | insert_from_string_before_markers (Lisp_Object string, |
| 879 | ptrdiff_t pos, ptrdiff_t pos_byte, |
| 880 | ptrdiff_t length, ptrdiff_t length_byte, |
| 881 | bool inherit) |
| 882 | { |
| 883 | ptrdiff_t opoint = PT; |
| 884 | |
| 885 | if (SCHARS (string) == 0) |
| 886 | return; |
| 887 | |
| 888 | insert_from_string_1 (string, pos, pos_byte, length, length_byte, |
| 889 | inherit, 1); |
| 890 | signal_after_change (opoint, 0, PT - opoint); |
| 891 | update_compositions (opoint, PT, CHECK_BORDER); |
| 892 | } |
| 893 | |
| 894 | /* Subroutine of the insertion functions above. */ |
| 895 | |
| 896 | static void |
| 897 | insert_from_string_1 (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte, |
| 898 | ptrdiff_t nchars, ptrdiff_t nbytes, |
| 899 | bool inherit, bool before_markers) |
| 900 | { |
| 901 | struct gcpro gcpro1; |
| 902 | ptrdiff_t outgoing_nbytes = nbytes; |
| 903 | INTERVAL intervals; |
| 904 | |
| 905 | /* Make OUTGOING_NBYTES describe the text |
| 906 | as it will be inserted in this buffer. */ |
| 907 | |
| 908 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 909 | outgoing_nbytes = nchars; |
| 910 | else if (! STRING_MULTIBYTE (string)) |
| 911 | outgoing_nbytes |
| 912 | = count_size_as_multibyte (SDATA (string) + pos_byte, |
| 913 | nbytes); |
| 914 | |
| 915 | GCPRO1 (string); |
| 916 | /* Do this before moving and increasing the gap, |
| 917 | because the before-change hooks might move the gap |
| 918 | or make it smaller. */ |
| 919 | prepare_to_modify_buffer (PT, PT, NULL); |
| 920 | |
| 921 | if (PT != GPT) |
| 922 | move_gap_both (PT, PT_BYTE); |
| 923 | if (GAP_SIZE < outgoing_nbytes) |
| 924 | make_gap (outgoing_nbytes - GAP_SIZE); |
| 925 | UNGCPRO; |
| 926 | |
| 927 | /* Copy the string text into the buffer, perhaps converting |
| 928 | between single-byte and multibyte. */ |
| 929 | copy_text (SDATA (string) + pos_byte, GPT_ADDR, nbytes, |
| 930 | STRING_MULTIBYTE (string), |
| 931 | ! NILP (BVAR (current_buffer, enable_multibyte_characters))); |
| 932 | |
| 933 | #ifdef BYTE_COMBINING_DEBUG |
| 934 | /* We have copied text into the gap, but we have not altered |
| 935 | PT or PT_BYTE yet. So we can pass PT and PT_BYTE |
| 936 | to these functions and get the same results as we would |
| 937 | have got earlier on. Meanwhile, PT_ADDR does point to |
| 938 | the text that has been stored by copy_text. */ |
| 939 | if (count_combining_before (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE) |
| 940 | || count_combining_after (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE)) |
| 941 | emacs_abort (); |
| 942 | #endif |
| 943 | |
| 944 | record_insert (PT, nchars); |
| 945 | MODIFF++; |
| 946 | CHARS_MODIFF = MODIFF; |
| 947 | |
| 948 | GAP_SIZE -= outgoing_nbytes; |
| 949 | GPT += nchars; |
| 950 | ZV += nchars; |
| 951 | Z += nchars; |
| 952 | GPT_BYTE += outgoing_nbytes; |
| 953 | ZV_BYTE += outgoing_nbytes; |
| 954 | Z_BYTE += outgoing_nbytes; |
| 955 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 956 | |
| 957 | eassert (GPT <= GPT_BYTE); |
| 958 | |
| 959 | /* The insert may have been in the unchanged region, so check again. */ |
| 960 | if (Z - GPT < END_UNCHANGED) |
| 961 | END_UNCHANGED = Z - GPT; |
| 962 | |
| 963 | adjust_overlays_for_insert (PT, nchars); |
| 964 | adjust_markers_for_insert (PT, PT_BYTE, PT + nchars, |
| 965 | PT_BYTE + outgoing_nbytes, |
| 966 | before_markers); |
| 967 | |
| 968 | offset_intervals (current_buffer, PT, nchars); |
| 969 | |
| 970 | intervals = string_intervals (string); |
| 971 | /* Get the intervals for the part of the string we are inserting. */ |
| 972 | if (nbytes < SBYTES (string)) |
| 973 | intervals = copy_intervals (intervals, pos, nchars); |
| 974 | |
| 975 | /* Insert those intervals. */ |
| 976 | graft_intervals_into_buffer (intervals, PT, nchars, |
| 977 | current_buffer, inherit); |
| 978 | |
| 979 | adjust_point (nchars, outgoing_nbytes); |
| 980 | |
| 981 | check_markers (); |
| 982 | } |
| 983 | \f |
| 984 | /* Insert a sequence of NCHARS chars which occupy NBYTES bytes |
| 985 | starting at GAP_END_ADDR - NBYTES (if text_at_gap_tail) and at |
| 986 | GPT_ADDR (if not text_at_gap_tail). */ |
| 987 | |
| 988 | void |
| 989 | insert_from_gap (ptrdiff_t nchars, ptrdiff_t nbytes, bool text_at_gap_tail) |
| 990 | { |
| 991 | ptrdiff_t ins_charpos = GPT, ins_bytepos = GPT_BYTE; |
| 992 | |
| 993 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 994 | nchars = nbytes; |
| 995 | |
| 996 | /* No need to call prepare_to_modify_buffer, since this is called |
| 997 | from places that replace some region with a different text, so |
| 998 | prepare_to_modify_buffer was already called by the deletion part |
| 999 | of this dance. */ |
| 1000 | invalidate_buffer_caches (current_buffer, GPT, GPT); |
| 1001 | record_insert (GPT, nchars); |
| 1002 | MODIFF++; |
| 1003 | |
| 1004 | GAP_SIZE -= nbytes; |
| 1005 | if (! text_at_gap_tail) |
| 1006 | { |
| 1007 | GPT += nchars; |
| 1008 | GPT_BYTE += nbytes; |
| 1009 | } |
| 1010 | ZV += nchars; |
| 1011 | Z += nchars; |
| 1012 | ZV_BYTE += nbytes; |
| 1013 | Z_BYTE += nbytes; |
| 1014 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1015 | |
| 1016 | eassert (GPT <= GPT_BYTE); |
| 1017 | |
| 1018 | adjust_overlays_for_insert (ins_charpos, nchars); |
| 1019 | adjust_markers_for_insert (ins_charpos, ins_bytepos, |
| 1020 | ins_charpos + nchars, ins_bytepos + nbytes, 0); |
| 1021 | |
| 1022 | if (buffer_intervals (current_buffer)) |
| 1023 | { |
| 1024 | offset_intervals (current_buffer, ins_charpos, nchars); |
| 1025 | graft_intervals_into_buffer (NULL, ins_charpos, nchars, |
| 1026 | current_buffer, 0); |
| 1027 | } |
| 1028 | |
| 1029 | if (ins_charpos < PT) |
| 1030 | adjust_point (nchars, nbytes); |
| 1031 | |
| 1032 | check_markers (); |
| 1033 | } |
| 1034 | \f |
| 1035 | /* Insert text from BUF, NCHARS characters starting at CHARPOS, into the |
| 1036 | current buffer. If the text in BUF has properties, they are absorbed |
| 1037 | into the current buffer. |
| 1038 | |
| 1039 | It does not work to use `insert' for this, because a malloc could happen |
| 1040 | and relocate BUF's text before the copy happens. */ |
| 1041 | |
| 1042 | void |
| 1043 | insert_from_buffer (struct buffer *buf, |
| 1044 | ptrdiff_t charpos, ptrdiff_t nchars, bool inherit) |
| 1045 | { |
| 1046 | ptrdiff_t opoint = PT; |
| 1047 | |
| 1048 | insert_from_buffer_1 (buf, charpos, nchars, inherit); |
| 1049 | signal_after_change (opoint, 0, PT - opoint); |
| 1050 | update_compositions (opoint, PT, CHECK_BORDER); |
| 1051 | } |
| 1052 | |
| 1053 | static void |
| 1054 | insert_from_buffer_1 (struct buffer *buf, |
| 1055 | ptrdiff_t from, ptrdiff_t nchars, bool inherit) |
| 1056 | { |
| 1057 | ptrdiff_t chunk, chunk_expanded; |
| 1058 | ptrdiff_t from_byte = buf_charpos_to_bytepos (buf, from); |
| 1059 | ptrdiff_t to_byte = buf_charpos_to_bytepos (buf, from + nchars); |
| 1060 | ptrdiff_t incoming_nbytes = to_byte - from_byte; |
| 1061 | ptrdiff_t outgoing_nbytes = incoming_nbytes; |
| 1062 | INTERVAL intervals; |
| 1063 | |
| 1064 | if (nchars == 0) |
| 1065 | return; |
| 1066 | |
| 1067 | /* Make OUTGOING_NBYTES describe the text |
| 1068 | as it will be inserted in this buffer. */ |
| 1069 | |
| 1070 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 1071 | outgoing_nbytes = nchars; |
| 1072 | else if (NILP (BVAR (buf, enable_multibyte_characters))) |
| 1073 | { |
| 1074 | ptrdiff_t outgoing_before_gap = 0; |
| 1075 | ptrdiff_t outgoing_after_gap = 0; |
| 1076 | |
| 1077 | if (from < BUF_GPT (buf)) |
| 1078 | { |
| 1079 | chunk = BUF_GPT_BYTE (buf) - from_byte; |
| 1080 | if (chunk > incoming_nbytes) |
| 1081 | chunk = incoming_nbytes; |
| 1082 | outgoing_before_gap |
| 1083 | = count_size_as_multibyte (BUF_BYTE_ADDRESS (buf, from_byte), |
| 1084 | chunk); |
| 1085 | } |
| 1086 | else |
| 1087 | chunk = 0; |
| 1088 | |
| 1089 | if (chunk < incoming_nbytes) |
| 1090 | outgoing_after_gap |
| 1091 | = count_size_as_multibyte (BUF_BYTE_ADDRESS (buf, |
| 1092 | from_byte + chunk), |
| 1093 | incoming_nbytes - chunk); |
| 1094 | |
| 1095 | outgoing_nbytes = outgoing_before_gap + outgoing_after_gap; |
| 1096 | } |
| 1097 | |
| 1098 | /* Do this before moving and increasing the gap, |
| 1099 | because the before-change hooks might move the gap |
| 1100 | or make it smaller. */ |
| 1101 | prepare_to_modify_buffer (PT, PT, NULL); |
| 1102 | |
| 1103 | if (PT != GPT) |
| 1104 | move_gap_both (PT, PT_BYTE); |
| 1105 | if (GAP_SIZE < outgoing_nbytes) |
| 1106 | make_gap (outgoing_nbytes - GAP_SIZE); |
| 1107 | |
| 1108 | if (from < BUF_GPT (buf)) |
| 1109 | { |
| 1110 | chunk = BUF_GPT_BYTE (buf) - from_byte; |
| 1111 | if (chunk > incoming_nbytes) |
| 1112 | chunk = incoming_nbytes; |
| 1113 | /* Record number of output bytes, so we know where |
| 1114 | to put the output from the second copy_text. */ |
| 1115 | chunk_expanded |
| 1116 | = copy_text (BUF_BYTE_ADDRESS (buf, from_byte), |
| 1117 | GPT_ADDR, chunk, |
| 1118 | ! NILP (BVAR (buf, enable_multibyte_characters)), |
| 1119 | ! NILP (BVAR (current_buffer, enable_multibyte_characters))); |
| 1120 | } |
| 1121 | else |
| 1122 | chunk_expanded = chunk = 0; |
| 1123 | |
| 1124 | if (chunk < incoming_nbytes) |
| 1125 | copy_text (BUF_BYTE_ADDRESS (buf, from_byte + chunk), |
| 1126 | GPT_ADDR + chunk_expanded, incoming_nbytes - chunk, |
| 1127 | ! NILP (BVAR (buf, enable_multibyte_characters)), |
| 1128 | ! NILP (BVAR (current_buffer, enable_multibyte_characters))); |
| 1129 | |
| 1130 | #ifdef BYTE_COMBINING_DEBUG |
| 1131 | /* We have copied text into the gap, but we have not altered |
| 1132 | PT or PT_BYTE yet. So we can pass PT and PT_BYTE |
| 1133 | to these functions and get the same results as we would |
| 1134 | have got earlier on. Meanwhile, GPT_ADDR does point to |
| 1135 | the text that has been stored by copy_text. */ |
| 1136 | if (count_combining_before (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE) |
| 1137 | || count_combining_after (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE)) |
| 1138 | emacs_abort (); |
| 1139 | #endif |
| 1140 | |
| 1141 | record_insert (PT, nchars); |
| 1142 | MODIFF++; |
| 1143 | CHARS_MODIFF = MODIFF; |
| 1144 | |
| 1145 | GAP_SIZE -= outgoing_nbytes; |
| 1146 | GPT += nchars; |
| 1147 | ZV += nchars; |
| 1148 | Z += nchars; |
| 1149 | GPT_BYTE += outgoing_nbytes; |
| 1150 | ZV_BYTE += outgoing_nbytes; |
| 1151 | Z_BYTE += outgoing_nbytes; |
| 1152 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1153 | |
| 1154 | eassert (GPT <= GPT_BYTE); |
| 1155 | |
| 1156 | /* The insert may have been in the unchanged region, so check again. */ |
| 1157 | if (Z - GPT < END_UNCHANGED) |
| 1158 | END_UNCHANGED = Z - GPT; |
| 1159 | |
| 1160 | adjust_overlays_for_insert (PT, nchars); |
| 1161 | adjust_markers_for_insert (PT, PT_BYTE, PT + nchars, |
| 1162 | PT_BYTE + outgoing_nbytes, |
| 1163 | 0); |
| 1164 | |
| 1165 | offset_intervals (current_buffer, PT, nchars); |
| 1166 | |
| 1167 | /* Get the intervals for the part of the string we are inserting. */ |
| 1168 | intervals = buffer_intervals (buf); |
| 1169 | if (nchars < BUF_Z (buf) - BUF_BEG (buf)) |
| 1170 | { |
| 1171 | if (buf == current_buffer && PT <= from) |
| 1172 | from += nchars; |
| 1173 | intervals = copy_intervals (intervals, from, nchars); |
| 1174 | } |
| 1175 | |
| 1176 | /* Insert those intervals. */ |
| 1177 | graft_intervals_into_buffer (intervals, PT, nchars, current_buffer, inherit); |
| 1178 | |
| 1179 | adjust_point (nchars, outgoing_nbytes); |
| 1180 | } |
| 1181 | \f |
| 1182 | /* Record undo information and adjust markers and position keepers for |
| 1183 | a replacement of a text PREV_TEXT at FROM to a new text of LEN |
| 1184 | chars (LEN_BYTE bytes) which resides in the gap just after |
| 1185 | GPT_ADDR. |
| 1186 | |
| 1187 | PREV_TEXT nil means the new text was just inserted. */ |
| 1188 | |
| 1189 | static void |
| 1190 | adjust_after_replace (ptrdiff_t from, ptrdiff_t from_byte, |
| 1191 | Lisp_Object prev_text, ptrdiff_t len, ptrdiff_t len_byte) |
| 1192 | { |
| 1193 | ptrdiff_t nchars_del = 0, nbytes_del = 0; |
| 1194 | |
| 1195 | #ifdef BYTE_COMBINING_DEBUG |
| 1196 | if (count_combining_before (GPT_ADDR, len_byte, from, from_byte) |
| 1197 | || count_combining_after (GPT_ADDR, len_byte, from, from_byte)) |
| 1198 | emacs_abort (); |
| 1199 | #endif |
| 1200 | |
| 1201 | if (STRINGP (prev_text)) |
| 1202 | { |
| 1203 | nchars_del = SCHARS (prev_text); |
| 1204 | nbytes_del = SBYTES (prev_text); |
| 1205 | } |
| 1206 | |
| 1207 | /* Update various buffer positions for the new text. */ |
| 1208 | GAP_SIZE -= len_byte; |
| 1209 | ZV += len; Z+= len; |
| 1210 | ZV_BYTE += len_byte; Z_BYTE += len_byte; |
| 1211 | GPT += len; GPT_BYTE += len_byte; |
| 1212 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1213 | |
| 1214 | if (nchars_del > 0) |
| 1215 | adjust_markers_for_replace (from, from_byte, nchars_del, nbytes_del, |
| 1216 | len, len_byte); |
| 1217 | else |
| 1218 | adjust_markers_for_insert (from, from_byte, |
| 1219 | from + len, from_byte + len_byte, 0); |
| 1220 | |
| 1221 | if (nchars_del > 0) |
| 1222 | record_delete (from, prev_text); |
| 1223 | record_insert (from, len); |
| 1224 | |
| 1225 | if (len > nchars_del) |
| 1226 | adjust_overlays_for_insert (from, len - nchars_del); |
| 1227 | else if (len < nchars_del) |
| 1228 | adjust_overlays_for_delete (from, nchars_del - len); |
| 1229 | |
| 1230 | offset_intervals (current_buffer, from, len - nchars_del); |
| 1231 | |
| 1232 | if (from < PT) |
| 1233 | adjust_point (len - nchars_del, len_byte - nbytes_del); |
| 1234 | |
| 1235 | /* As byte combining will decrease Z, we must check this again. */ |
| 1236 | if (Z - GPT < END_UNCHANGED) |
| 1237 | END_UNCHANGED = Z - GPT; |
| 1238 | |
| 1239 | check_markers (); |
| 1240 | |
| 1241 | if (len == 0) |
| 1242 | evaporate_overlays (from); |
| 1243 | MODIFF++; |
| 1244 | CHARS_MODIFF = MODIFF; |
| 1245 | } |
| 1246 | |
| 1247 | /* Record undo information, adjust markers and position keepers for an |
| 1248 | insertion of a text from FROM (FROM_BYTE) to TO (TO_BYTE). The |
| 1249 | text already exists in the current buffer but character length (TO |
| 1250 | - FROM) may be incorrect, the correct length is NEWLEN. */ |
| 1251 | |
| 1252 | void |
| 1253 | adjust_after_insert (ptrdiff_t from, ptrdiff_t from_byte, |
| 1254 | ptrdiff_t to, ptrdiff_t to_byte, ptrdiff_t newlen) |
| 1255 | { |
| 1256 | ptrdiff_t len = to - from, len_byte = to_byte - from_byte; |
| 1257 | |
| 1258 | if (GPT != to) |
| 1259 | move_gap_both (to, to_byte); |
| 1260 | GAP_SIZE += len_byte; |
| 1261 | GPT -= len; GPT_BYTE -= len_byte; |
| 1262 | ZV -= len; ZV_BYTE -= len_byte; |
| 1263 | Z -= len; Z_BYTE -= len_byte; |
| 1264 | adjust_after_replace (from, from_byte, Qnil, newlen, len_byte); |
| 1265 | } |
| 1266 | \f |
| 1267 | /* Replace the text from character positions FROM to TO with NEW, |
| 1268 | If PREPARE, call prepare_to_modify_buffer. |
| 1269 | If INHERIT, the newly inserted text should inherit text properties |
| 1270 | from the surrounding non-deleted text. */ |
| 1271 | |
| 1272 | /* Note that this does not yet handle markers quite right. |
| 1273 | Also it needs to record a single undo-entry that does a replacement |
| 1274 | rather than a separate delete and insert. |
| 1275 | That way, undo will also handle markers properly. |
| 1276 | |
| 1277 | But if MARKERS is 0, don't relocate markers. */ |
| 1278 | |
| 1279 | void |
| 1280 | replace_range (ptrdiff_t from, ptrdiff_t to, Lisp_Object new, |
| 1281 | bool prepare, bool inherit, bool markers) |
| 1282 | { |
| 1283 | ptrdiff_t inschars = SCHARS (new); |
| 1284 | ptrdiff_t insbytes = SBYTES (new); |
| 1285 | ptrdiff_t from_byte, to_byte; |
| 1286 | ptrdiff_t nbytes_del, nchars_del; |
| 1287 | struct gcpro gcpro1; |
| 1288 | INTERVAL intervals; |
| 1289 | ptrdiff_t outgoing_insbytes = insbytes; |
| 1290 | Lisp_Object deletion; |
| 1291 | |
| 1292 | check_markers (); |
| 1293 | |
| 1294 | GCPRO1 (new); |
| 1295 | deletion = Qnil; |
| 1296 | |
| 1297 | if (prepare) |
| 1298 | { |
| 1299 | ptrdiff_t range_length = to - from; |
| 1300 | prepare_to_modify_buffer (from, to, &from); |
| 1301 | to = from + range_length; |
| 1302 | } |
| 1303 | |
| 1304 | UNGCPRO; |
| 1305 | |
| 1306 | /* Make args be valid. */ |
| 1307 | if (from < BEGV) |
| 1308 | from = BEGV; |
| 1309 | if (to > ZV) |
| 1310 | to = ZV; |
| 1311 | |
| 1312 | from_byte = CHAR_TO_BYTE (from); |
| 1313 | to_byte = CHAR_TO_BYTE (to); |
| 1314 | |
| 1315 | nchars_del = to - from; |
| 1316 | nbytes_del = to_byte - from_byte; |
| 1317 | |
| 1318 | if (nbytes_del <= 0 && insbytes == 0) |
| 1319 | return; |
| 1320 | |
| 1321 | /* Make OUTGOING_INSBYTES describe the text |
| 1322 | as it will be inserted in this buffer. */ |
| 1323 | |
| 1324 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 1325 | outgoing_insbytes = inschars; |
| 1326 | else if (! STRING_MULTIBYTE (new)) |
| 1327 | outgoing_insbytes |
| 1328 | = count_size_as_multibyte (SDATA (new), insbytes); |
| 1329 | |
| 1330 | GCPRO1 (new); |
| 1331 | |
| 1332 | /* Make sure the gap is somewhere in or next to what we are deleting. */ |
| 1333 | if (from > GPT) |
| 1334 | gap_right (from, from_byte); |
| 1335 | if (to < GPT) |
| 1336 | gap_left (to, to_byte, 0); |
| 1337 | |
| 1338 | /* Even if we don't record for undo, we must keep the original text |
| 1339 | because we may have to recover it because of inappropriate byte |
| 1340 | combining. */ |
| 1341 | if (! EQ (BVAR (current_buffer, undo_list), Qt)) |
| 1342 | deletion = make_buffer_string_both (from, from_byte, to, to_byte, 1); |
| 1343 | |
| 1344 | GAP_SIZE += nbytes_del; |
| 1345 | ZV -= nchars_del; |
| 1346 | Z -= nchars_del; |
| 1347 | ZV_BYTE -= nbytes_del; |
| 1348 | Z_BYTE -= nbytes_del; |
| 1349 | GPT = from; |
| 1350 | GPT_BYTE = from_byte; |
| 1351 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1352 | |
| 1353 | eassert (GPT <= GPT_BYTE); |
| 1354 | |
| 1355 | if (GPT - BEG < BEG_UNCHANGED) |
| 1356 | BEG_UNCHANGED = GPT - BEG; |
| 1357 | if (Z - GPT < END_UNCHANGED) |
| 1358 | END_UNCHANGED = Z - GPT; |
| 1359 | |
| 1360 | if (GAP_SIZE < outgoing_insbytes) |
| 1361 | make_gap (outgoing_insbytes - GAP_SIZE); |
| 1362 | |
| 1363 | /* Copy the string text into the buffer, perhaps converting |
| 1364 | between single-byte and multibyte. */ |
| 1365 | copy_text (SDATA (new), GPT_ADDR, insbytes, |
| 1366 | STRING_MULTIBYTE (new), |
| 1367 | ! NILP (BVAR (current_buffer, enable_multibyte_characters))); |
| 1368 | |
| 1369 | #ifdef BYTE_COMBINING_DEBUG |
| 1370 | /* We have copied text into the gap, but we have not marked |
| 1371 | it as part of the buffer. So we can use the old FROM and FROM_BYTE |
| 1372 | here, for both the previous text and the following text. |
| 1373 | Meanwhile, GPT_ADDR does point to |
| 1374 | the text that has been stored by copy_text. */ |
| 1375 | if (count_combining_before (GPT_ADDR, outgoing_insbytes, from, from_byte) |
| 1376 | || count_combining_after (GPT_ADDR, outgoing_insbytes, from, from_byte)) |
| 1377 | emacs_abort (); |
| 1378 | #endif |
| 1379 | |
| 1380 | /* Record the insertion first, so that when we undo, |
| 1381 | the deletion will be undone first. Thus, undo |
| 1382 | will insert before deleting, and thus will keep |
| 1383 | the markers before and after this text separate. */ |
| 1384 | if (!NILP (deletion)) |
| 1385 | { |
| 1386 | record_insert (from + SCHARS (deletion), inschars); |
| 1387 | record_delete (from, deletion); |
| 1388 | } |
| 1389 | |
| 1390 | GAP_SIZE -= outgoing_insbytes; |
| 1391 | GPT += inschars; |
| 1392 | ZV += inschars; |
| 1393 | Z += inschars; |
| 1394 | GPT_BYTE += outgoing_insbytes; |
| 1395 | ZV_BYTE += outgoing_insbytes; |
| 1396 | Z_BYTE += outgoing_insbytes; |
| 1397 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1398 | |
| 1399 | eassert (GPT <= GPT_BYTE); |
| 1400 | |
| 1401 | /* Adjust markers for the deletion and the insertion. */ |
| 1402 | if (markers) |
| 1403 | adjust_markers_for_replace (from, from_byte, nchars_del, nbytes_del, |
| 1404 | inschars, outgoing_insbytes); |
| 1405 | |
| 1406 | /* Adjust the overlay center as needed. This must be done after |
| 1407 | adjusting the markers that bound the overlays. */ |
| 1408 | adjust_overlays_for_delete (from, nchars_del); |
| 1409 | adjust_overlays_for_insert (from, inschars); |
| 1410 | |
| 1411 | offset_intervals (current_buffer, from, inschars - nchars_del); |
| 1412 | |
| 1413 | /* Get the intervals for the part of the string we are inserting-- |
| 1414 | not including the combined-before bytes. */ |
| 1415 | intervals = string_intervals (new); |
| 1416 | /* Insert those intervals. */ |
| 1417 | graft_intervals_into_buffer (intervals, from, inschars, |
| 1418 | current_buffer, inherit); |
| 1419 | |
| 1420 | /* Relocate point as if it were a marker. */ |
| 1421 | if (from < PT) |
| 1422 | adjust_point ((from + inschars - (PT < to ? PT : to)), |
| 1423 | (from_byte + outgoing_insbytes |
| 1424 | - (PT_BYTE < to_byte ? PT_BYTE : to_byte))); |
| 1425 | |
| 1426 | if (outgoing_insbytes == 0) |
| 1427 | evaporate_overlays (from); |
| 1428 | |
| 1429 | check_markers (); |
| 1430 | |
| 1431 | MODIFF++; |
| 1432 | CHARS_MODIFF = MODIFF; |
| 1433 | UNGCPRO; |
| 1434 | |
| 1435 | signal_after_change (from, nchars_del, GPT - from); |
| 1436 | update_compositions (from, GPT, CHECK_BORDER); |
| 1437 | } |
| 1438 | \f |
| 1439 | /* Replace the text from character positions FROM to TO with |
| 1440 | the text in INS of length INSCHARS. |
| 1441 | Keep the text properties that applied to the old characters |
| 1442 | (extending them to all the new chars if there are more new chars). |
| 1443 | |
| 1444 | Note that this does not yet handle markers quite right. |
| 1445 | |
| 1446 | If MARKERS, relocate markers. |
| 1447 | |
| 1448 | Unlike most functions at this level, never call |
| 1449 | prepare_to_modify_buffer and never call signal_after_change. */ |
| 1450 | |
| 1451 | void |
| 1452 | replace_range_2 (ptrdiff_t from, ptrdiff_t from_byte, |
| 1453 | ptrdiff_t to, ptrdiff_t to_byte, |
| 1454 | const char *ins, ptrdiff_t inschars, ptrdiff_t insbytes, |
| 1455 | bool markers) |
| 1456 | { |
| 1457 | ptrdiff_t nbytes_del, nchars_del; |
| 1458 | |
| 1459 | check_markers (); |
| 1460 | |
| 1461 | nchars_del = to - from; |
| 1462 | nbytes_del = to_byte - from_byte; |
| 1463 | |
| 1464 | if (nbytes_del <= 0 && insbytes == 0) |
| 1465 | return; |
| 1466 | |
| 1467 | /* Make sure the gap is somewhere in or next to what we are deleting. */ |
| 1468 | if (from > GPT) |
| 1469 | gap_right (from, from_byte); |
| 1470 | if (to < GPT) |
| 1471 | gap_left (to, to_byte, 0); |
| 1472 | |
| 1473 | GAP_SIZE += nbytes_del; |
| 1474 | ZV -= nchars_del; |
| 1475 | Z -= nchars_del; |
| 1476 | ZV_BYTE -= nbytes_del; |
| 1477 | Z_BYTE -= nbytes_del; |
| 1478 | GPT = from; |
| 1479 | GPT_BYTE = from_byte; |
| 1480 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1481 | |
| 1482 | eassert (GPT <= GPT_BYTE); |
| 1483 | |
| 1484 | if (GPT - BEG < BEG_UNCHANGED) |
| 1485 | BEG_UNCHANGED = GPT - BEG; |
| 1486 | if (Z - GPT < END_UNCHANGED) |
| 1487 | END_UNCHANGED = Z - GPT; |
| 1488 | |
| 1489 | if (GAP_SIZE < insbytes) |
| 1490 | make_gap (insbytes - GAP_SIZE); |
| 1491 | |
| 1492 | /* Copy the replacement text into the buffer. */ |
| 1493 | memcpy (GPT_ADDR, ins, insbytes); |
| 1494 | |
| 1495 | #ifdef BYTE_COMBINING_DEBUG |
| 1496 | /* We have copied text into the gap, but we have not marked |
| 1497 | it as part of the buffer. So we can use the old FROM and FROM_BYTE |
| 1498 | here, for both the previous text and the following text. |
| 1499 | Meanwhile, GPT_ADDR does point to |
| 1500 | the text that has been stored by copy_text. */ |
| 1501 | if (count_combining_before (GPT_ADDR, insbytes, from, from_byte) |
| 1502 | || count_combining_after (GPT_ADDR, insbytes, from, from_byte)) |
| 1503 | emacs_abort (); |
| 1504 | #endif |
| 1505 | |
| 1506 | GAP_SIZE -= insbytes; |
| 1507 | GPT += inschars; |
| 1508 | ZV += inschars; |
| 1509 | Z += inschars; |
| 1510 | GPT_BYTE += insbytes; |
| 1511 | ZV_BYTE += insbytes; |
| 1512 | Z_BYTE += insbytes; |
| 1513 | if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */ |
| 1514 | |
| 1515 | eassert (GPT <= GPT_BYTE); |
| 1516 | |
| 1517 | /* Adjust markers for the deletion and the insertion. */ |
| 1518 | if (markers |
| 1519 | && ! (nchars_del == 1 && inschars == 1 && nbytes_del == insbytes)) |
| 1520 | adjust_markers_for_replace (from, from_byte, nchars_del, nbytes_del, |
| 1521 | inschars, insbytes); |
| 1522 | |
| 1523 | /* Adjust the overlay center as needed. This must be done after |
| 1524 | adjusting the markers that bound the overlays. */ |
| 1525 | if (nchars_del != inschars) |
| 1526 | { |
| 1527 | adjust_overlays_for_insert (from, inschars); |
| 1528 | adjust_overlays_for_delete (from + inschars, nchars_del); |
| 1529 | } |
| 1530 | |
| 1531 | offset_intervals (current_buffer, from, inschars - nchars_del); |
| 1532 | |
| 1533 | /* Relocate point as if it were a marker. */ |
| 1534 | if (from < PT && (nchars_del != inschars || nbytes_del != insbytes)) |
| 1535 | { |
| 1536 | if (PT < to) |
| 1537 | /* PT was within the deleted text. Move it to FROM. */ |
| 1538 | adjust_point (from - PT, from_byte - PT_BYTE); |
| 1539 | else |
| 1540 | adjust_point (inschars - nchars_del, insbytes - nbytes_del); |
| 1541 | } |
| 1542 | |
| 1543 | if (insbytes == 0) |
| 1544 | evaporate_overlays (from); |
| 1545 | |
| 1546 | check_markers (); |
| 1547 | |
| 1548 | MODIFF++; |
| 1549 | CHARS_MODIFF = MODIFF; |
| 1550 | } |
| 1551 | \f |
| 1552 | /* Delete characters in current buffer |
| 1553 | from FROM up to (but not including) TO. |
| 1554 | If TO comes before FROM, we delete nothing. */ |
| 1555 | |
| 1556 | void |
| 1557 | del_range (ptrdiff_t from, ptrdiff_t to) |
| 1558 | { |
| 1559 | del_range_1 (from, to, 1, 0); |
| 1560 | } |
| 1561 | |
| 1562 | /* Like del_range; PREPARE says whether to call prepare_to_modify_buffer. |
| 1563 | RET_STRING says to return the deleted text. */ |
| 1564 | |
| 1565 | Lisp_Object |
| 1566 | del_range_1 (ptrdiff_t from, ptrdiff_t to, bool prepare, bool ret_string) |
| 1567 | { |
| 1568 | ptrdiff_t from_byte, to_byte; |
| 1569 | Lisp_Object deletion; |
| 1570 | struct gcpro gcpro1; |
| 1571 | |
| 1572 | /* Make args be valid */ |
| 1573 | if (from < BEGV) |
| 1574 | from = BEGV; |
| 1575 | if (to > ZV) |
| 1576 | to = ZV; |
| 1577 | |
| 1578 | if (to <= from) |
| 1579 | return Qnil; |
| 1580 | |
| 1581 | if (prepare) |
| 1582 | { |
| 1583 | ptrdiff_t range_length = to - from; |
| 1584 | prepare_to_modify_buffer (from, to, &from); |
| 1585 | to = min (ZV, from + range_length); |
| 1586 | } |
| 1587 | |
| 1588 | from_byte = CHAR_TO_BYTE (from); |
| 1589 | to_byte = CHAR_TO_BYTE (to); |
| 1590 | |
| 1591 | deletion = del_range_2 (from, from_byte, to, to_byte, ret_string); |
| 1592 | GCPRO1 (deletion); |
| 1593 | signal_after_change (from, to - from, 0); |
| 1594 | update_compositions (from, from, CHECK_HEAD); |
| 1595 | UNGCPRO; |
| 1596 | return deletion; |
| 1597 | } |
| 1598 | |
| 1599 | /* Like del_range_1 but args are byte positions, not char positions. */ |
| 1600 | |
| 1601 | void |
| 1602 | del_range_byte (ptrdiff_t from_byte, ptrdiff_t to_byte, bool prepare) |
| 1603 | { |
| 1604 | ptrdiff_t from, to; |
| 1605 | |
| 1606 | /* Make args be valid */ |
| 1607 | if (from_byte < BEGV_BYTE) |
| 1608 | from_byte = BEGV_BYTE; |
| 1609 | if (to_byte > ZV_BYTE) |
| 1610 | to_byte = ZV_BYTE; |
| 1611 | |
| 1612 | if (to_byte <= from_byte) |
| 1613 | return; |
| 1614 | |
| 1615 | from = BYTE_TO_CHAR (from_byte); |
| 1616 | to = BYTE_TO_CHAR (to_byte); |
| 1617 | |
| 1618 | if (prepare) |
| 1619 | { |
| 1620 | ptrdiff_t old_from = from, old_to = Z - to; |
| 1621 | ptrdiff_t range_length = to - from; |
| 1622 | prepare_to_modify_buffer (from, to, &from); |
| 1623 | to = from + range_length; |
| 1624 | |
| 1625 | if (old_from != from) |
| 1626 | from_byte = CHAR_TO_BYTE (from); |
| 1627 | if (to > ZV) |
| 1628 | { |
| 1629 | to = ZV; |
| 1630 | to_byte = ZV_BYTE; |
| 1631 | } |
| 1632 | else if (old_to == Z - to) |
| 1633 | to_byte = CHAR_TO_BYTE (to); |
| 1634 | } |
| 1635 | |
| 1636 | del_range_2 (from, from_byte, to, to_byte, 0); |
| 1637 | signal_after_change (from, to - from, 0); |
| 1638 | update_compositions (from, from, CHECK_HEAD); |
| 1639 | } |
| 1640 | |
| 1641 | /* Like del_range_1, but positions are specified both as charpos |
| 1642 | and bytepos. */ |
| 1643 | |
| 1644 | void |
| 1645 | del_range_both (ptrdiff_t from, ptrdiff_t from_byte, |
| 1646 | ptrdiff_t to, ptrdiff_t to_byte, bool prepare) |
| 1647 | { |
| 1648 | /* Make args be valid */ |
| 1649 | if (from_byte < BEGV_BYTE) |
| 1650 | from_byte = BEGV_BYTE; |
| 1651 | if (to_byte > ZV_BYTE) |
| 1652 | to_byte = ZV_BYTE; |
| 1653 | |
| 1654 | if (to_byte <= from_byte) |
| 1655 | return; |
| 1656 | |
| 1657 | if (from < BEGV) |
| 1658 | from = BEGV; |
| 1659 | if (to > ZV) |
| 1660 | to = ZV; |
| 1661 | |
| 1662 | if (prepare) |
| 1663 | { |
| 1664 | ptrdiff_t old_from = from, old_to = Z - to; |
| 1665 | ptrdiff_t range_length = to - from; |
| 1666 | prepare_to_modify_buffer (from, to, &from); |
| 1667 | to = from + range_length; |
| 1668 | |
| 1669 | if (old_from != from) |
| 1670 | from_byte = CHAR_TO_BYTE (from); |
| 1671 | if (to > ZV) |
| 1672 | { |
| 1673 | to = ZV; |
| 1674 | to_byte = ZV_BYTE; |
| 1675 | } |
| 1676 | else if (old_to == Z - to) |
| 1677 | to_byte = CHAR_TO_BYTE (to); |
| 1678 | } |
| 1679 | |
| 1680 | del_range_2 (from, from_byte, to, to_byte, 0); |
| 1681 | signal_after_change (from, to - from, 0); |
| 1682 | update_compositions (from, from, CHECK_HEAD); |
| 1683 | } |
| 1684 | |
| 1685 | /* Delete a range of text, specified both as character positions |
| 1686 | and byte positions. FROM and TO are character positions, |
| 1687 | while FROM_BYTE and TO_BYTE are byte positions. |
| 1688 | If RET_STRING, the deleted area is returned as a string. */ |
| 1689 | |
| 1690 | Lisp_Object |
| 1691 | del_range_2 (ptrdiff_t from, ptrdiff_t from_byte, |
| 1692 | ptrdiff_t to, ptrdiff_t to_byte, bool ret_string) |
| 1693 | { |
| 1694 | ptrdiff_t nbytes_del, nchars_del; |
| 1695 | Lisp_Object deletion; |
| 1696 | |
| 1697 | check_markers (); |
| 1698 | |
| 1699 | nchars_del = to - from; |
| 1700 | nbytes_del = to_byte - from_byte; |
| 1701 | |
| 1702 | /* Make sure the gap is somewhere in or next to what we are deleting. */ |
| 1703 | if (from > GPT) |
| 1704 | gap_right (from, from_byte); |
| 1705 | if (to < GPT) |
| 1706 | gap_left (to, to_byte, 0); |
| 1707 | |
| 1708 | #ifdef BYTE_COMBINING_DEBUG |
| 1709 | if (count_combining_before (BUF_BYTE_ADDRESS (current_buffer, to_byte), |
| 1710 | Z_BYTE - to_byte, from, from_byte)) |
| 1711 | emacs_abort (); |
| 1712 | #endif |
| 1713 | |
| 1714 | if (ret_string || ! EQ (BVAR (current_buffer, undo_list), Qt)) |
| 1715 | deletion = make_buffer_string_both (from, from_byte, to, to_byte, 1); |
| 1716 | else |
| 1717 | deletion = Qnil; |
| 1718 | |
| 1719 | /* Relocate all markers pointing into the new, larger gap |
| 1720 | to point at the end of the text before the gap. |
| 1721 | Do this before recording the deletion, |
| 1722 | so that undo handles this after reinserting the text. */ |
| 1723 | adjust_markers_for_delete (from, from_byte, to, to_byte); |
| 1724 | |
| 1725 | record_delete (from, deletion); |
| 1726 | MODIFF++; |
| 1727 | CHARS_MODIFF = MODIFF; |
| 1728 | |
| 1729 | /* Relocate point as if it were a marker. */ |
| 1730 | if (from < PT) |
| 1731 | adjust_point (from - (PT < to ? PT : to), |
| 1732 | from_byte - (PT_BYTE < to_byte ? PT_BYTE : to_byte)); |
| 1733 | |
| 1734 | offset_intervals (current_buffer, from, - nchars_del); |
| 1735 | |
| 1736 | /* Adjust the overlay center as needed. This must be done after |
| 1737 | adjusting the markers that bound the overlays. */ |
| 1738 | adjust_overlays_for_delete (from, nchars_del); |
| 1739 | |
| 1740 | GAP_SIZE += nbytes_del; |
| 1741 | ZV_BYTE -= nbytes_del; |
| 1742 | Z_BYTE -= nbytes_del; |
| 1743 | ZV -= nchars_del; |
| 1744 | Z -= nchars_del; |
| 1745 | GPT = from; |
| 1746 | GPT_BYTE = from_byte; |
| 1747 | if (GAP_SIZE > 0 && !current_buffer->text->inhibit_shrinking) |
| 1748 | /* Put an anchor, unless called from decode_coding_object which |
| 1749 | needs to access the previous gap contents. */ |
| 1750 | *(GPT_ADDR) = 0; |
| 1751 | |
| 1752 | eassert (GPT <= GPT_BYTE); |
| 1753 | |
| 1754 | if (GPT - BEG < BEG_UNCHANGED) |
| 1755 | BEG_UNCHANGED = GPT - BEG; |
| 1756 | if (Z - GPT < END_UNCHANGED) |
| 1757 | END_UNCHANGED = Z - GPT; |
| 1758 | |
| 1759 | check_markers (); |
| 1760 | |
| 1761 | evaporate_overlays (from); |
| 1762 | |
| 1763 | return deletion; |
| 1764 | } |
| 1765 | |
| 1766 | /* Call this if you're about to change the text of current buffer |
| 1767 | from character positions START to END. This checks the read-only |
| 1768 | properties of the region, calls the necessary modification hooks, |
| 1769 | and warns the next redisplay that it should pay attention to that |
| 1770 | area. */ |
| 1771 | |
| 1772 | void |
| 1773 | modify_text (ptrdiff_t start, ptrdiff_t end) |
| 1774 | { |
| 1775 | prepare_to_modify_buffer (start, end, NULL); |
| 1776 | |
| 1777 | BUF_COMPUTE_UNCHANGED (current_buffer, start - 1, end); |
| 1778 | if (MODIFF <= SAVE_MODIFF) |
| 1779 | record_first_change (); |
| 1780 | MODIFF++; |
| 1781 | CHARS_MODIFF = MODIFF; |
| 1782 | |
| 1783 | bset_point_before_scroll (current_buffer, Qnil); |
| 1784 | } |
| 1785 | |
| 1786 | Lisp_Object Qregion_extract_function; |
| 1787 | |
| 1788 | /* Check that it is okay to modify the buffer between START and END, |
| 1789 | which are char positions. |
| 1790 | |
| 1791 | Run the before-change-function, if any. If intervals are in use, |
| 1792 | verify that the text to be modified is not read-only, and call |
| 1793 | any modification properties the text may have. |
| 1794 | |
| 1795 | If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR |
| 1796 | by holding its value temporarily in a marker. */ |
| 1797 | |
| 1798 | void |
| 1799 | prepare_to_modify_buffer_1 (ptrdiff_t start, ptrdiff_t end, |
| 1800 | ptrdiff_t *preserve_ptr) |
| 1801 | { |
| 1802 | struct buffer *base_buffer; |
| 1803 | |
| 1804 | if (!NILP (BVAR (current_buffer, read_only))) |
| 1805 | Fbarf_if_buffer_read_only (); |
| 1806 | |
| 1807 | bset_redisplay (current_buffer); |
| 1808 | |
| 1809 | if (buffer_intervals (current_buffer)) |
| 1810 | { |
| 1811 | if (preserve_ptr) |
| 1812 | { |
| 1813 | Lisp_Object preserve_marker; |
| 1814 | struct gcpro gcpro1; |
| 1815 | preserve_marker = Fcopy_marker (make_number (*preserve_ptr), Qnil); |
| 1816 | GCPRO1 (preserve_marker); |
| 1817 | verify_interval_modification (current_buffer, start, end); |
| 1818 | *preserve_ptr = marker_position (preserve_marker); |
| 1819 | unchain_marker (XMARKER (preserve_marker)); |
| 1820 | UNGCPRO; |
| 1821 | } |
| 1822 | else |
| 1823 | verify_interval_modification (current_buffer, start, end); |
| 1824 | } |
| 1825 | |
| 1826 | /* For indirect buffers, use the base buffer to check clashes. */ |
| 1827 | if (current_buffer->base_buffer != 0) |
| 1828 | base_buffer = current_buffer->base_buffer; |
| 1829 | else |
| 1830 | base_buffer = current_buffer; |
| 1831 | |
| 1832 | #ifdef CLASH_DETECTION |
| 1833 | if (!NILP (BVAR (base_buffer, file_truename)) |
| 1834 | /* Make binding buffer-file-name to nil effective. */ |
| 1835 | && !NILP (BVAR (base_buffer, filename)) |
| 1836 | && SAVE_MODIFF >= MODIFF) |
| 1837 | lock_file (BVAR (base_buffer, file_truename)); |
| 1838 | #else |
| 1839 | /* At least warn if this file has changed on disk since it was visited. */ |
| 1840 | if (!NILP (BVAR (base_buffer, filename)) |
| 1841 | && SAVE_MODIFF >= MODIFF |
| 1842 | && NILP (Fverify_visited_file_modtime (Fcurrent_buffer ())) |
| 1843 | && !NILP (Ffile_exists_p (BVAR (base_buffer, filename)))) |
| 1844 | call1 (intern ("ask-user-about-supersession-threat"), |
| 1845 | BVAR (base_buffer,filename)); |
| 1846 | #endif /* not CLASH_DETECTION */ |
| 1847 | |
| 1848 | /* If `select-active-regions' is non-nil, save the region text. */ |
| 1849 | /* FIXME: Move this to Elisp (via before-change-functions). */ |
| 1850 | if (!NILP (BVAR (current_buffer, mark_active)) |
| 1851 | && !inhibit_modification_hooks |
| 1852 | && XMARKER (BVAR (current_buffer, mark))->buffer |
| 1853 | && NILP (Vsaved_region_selection) |
| 1854 | && (EQ (Vselect_active_regions, Qonly) |
| 1855 | ? EQ (CAR_SAFE (Vtransient_mark_mode), Qonly) |
| 1856 | : (!NILP (Vselect_active_regions) |
| 1857 | && !NILP (Vtransient_mark_mode)))) |
| 1858 | Vsaved_region_selection |
| 1859 | = call1 (Fsymbol_value (Qregion_extract_function), Qnil); |
| 1860 | |
| 1861 | signal_before_change (start, end, preserve_ptr); |
| 1862 | Vdeactivate_mark = Qt; |
| 1863 | } |
| 1864 | |
| 1865 | /* Like above, but called when we know that the buffer text |
| 1866 | will be modified and region caches should be invalidated. */ |
| 1867 | |
| 1868 | void |
| 1869 | prepare_to_modify_buffer (ptrdiff_t start, ptrdiff_t end, |
| 1870 | ptrdiff_t *preserve_ptr) |
| 1871 | { |
| 1872 | prepare_to_modify_buffer_1 (start, end, preserve_ptr); |
| 1873 | invalidate_buffer_caches (current_buffer, start, end); |
| 1874 | } |
| 1875 | |
| 1876 | /* Invalidate the caches maintained by the buffer BUF, if any, for the |
| 1877 | region between buffer positions START and END. */ |
| 1878 | void |
| 1879 | invalidate_buffer_caches (struct buffer *buf, ptrdiff_t start, ptrdiff_t end) |
| 1880 | { |
| 1881 | /* Indirect buffers usually have their caches set to NULL, but we |
| 1882 | need to consider the caches of their base buffer. */ |
| 1883 | if (buf->base_buffer) |
| 1884 | buf = buf->base_buffer; |
| 1885 | if (buf->newline_cache) |
| 1886 | invalidate_region_cache (buf, |
| 1887 | buf->newline_cache, |
| 1888 | start - BUF_BEG (buf), BUF_Z (buf) - end); |
| 1889 | if (buf->width_run_cache) |
| 1890 | invalidate_region_cache (buf, |
| 1891 | buf->width_run_cache, |
| 1892 | start - BUF_BEG (buf), BUF_Z (buf) - end); |
| 1893 | if (buf->bidi_paragraph_cache) |
| 1894 | invalidate_region_cache (buf, |
| 1895 | buf->bidi_paragraph_cache, |
| 1896 | start - BUF_BEG (buf), BUF_Z (buf) - end); |
| 1897 | } |
| 1898 | |
| 1899 | /* These macros work with an argument named `preserve_ptr' |
| 1900 | and a local variable named `preserve_marker'. */ |
| 1901 | |
| 1902 | #define PRESERVE_VALUE \ |
| 1903 | if (preserve_ptr && NILP (preserve_marker)) \ |
| 1904 | preserve_marker = Fcopy_marker (make_number (*preserve_ptr), Qnil) |
| 1905 | |
| 1906 | #define RESTORE_VALUE \ |
| 1907 | if (! NILP (preserve_marker)) \ |
| 1908 | { \ |
| 1909 | *preserve_ptr = marker_position (preserve_marker); \ |
| 1910 | unchain_marker (XMARKER (preserve_marker)); \ |
| 1911 | } |
| 1912 | |
| 1913 | #define PRESERVE_START_END \ |
| 1914 | if (NILP (start_marker)) \ |
| 1915 | start_marker = Fcopy_marker (start, Qnil); \ |
| 1916 | if (NILP (end_marker)) \ |
| 1917 | end_marker = Fcopy_marker (end, Qnil); |
| 1918 | |
| 1919 | #define FETCH_START \ |
| 1920 | (! NILP (start_marker) ? Fmarker_position (start_marker) : start) |
| 1921 | |
| 1922 | #define FETCH_END \ |
| 1923 | (! NILP (end_marker) ? Fmarker_position (end_marker) : end) |
| 1924 | |
| 1925 | /* Set a variable to nil if an error occurred. |
| 1926 | Don't change the variable if there was no error. |
| 1927 | VAL is a cons-cell (VARIABLE . NO-ERROR-FLAG). |
| 1928 | VARIABLE is the variable to maybe set to nil. |
| 1929 | NO-ERROR-FLAG is nil if there was an error, |
| 1930 | anything else meaning no error (so this function does nothing). */ |
| 1931 | struct rvoe_arg |
| 1932 | { |
| 1933 | Lisp_Object *location; |
| 1934 | bool errorp; |
| 1935 | }; |
| 1936 | |
| 1937 | static void |
| 1938 | reset_var_on_error (void *ptr) |
| 1939 | { |
| 1940 | struct rvoe_arg *p = ptr; |
| 1941 | if (p->errorp) |
| 1942 | *p->location = Qnil; |
| 1943 | } |
| 1944 | |
| 1945 | /* Signal a change to the buffer immediately before it happens. |
| 1946 | START_INT and END_INT are the bounds of the text to be changed. |
| 1947 | |
| 1948 | If PRESERVE_PTR is nonzero, we relocate *PRESERVE_PTR |
| 1949 | by holding its value temporarily in a marker. */ |
| 1950 | |
| 1951 | static void |
| 1952 | signal_before_change (ptrdiff_t start_int, ptrdiff_t end_int, |
| 1953 | ptrdiff_t *preserve_ptr) |
| 1954 | { |
| 1955 | Lisp_Object start, end; |
| 1956 | Lisp_Object start_marker, end_marker; |
| 1957 | Lisp_Object preserve_marker; |
| 1958 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 1959 | ptrdiff_t count = SPECPDL_INDEX (); |
| 1960 | struct rvoe_arg rvoe_arg; |
| 1961 | |
| 1962 | if (inhibit_modification_hooks) |
| 1963 | return; |
| 1964 | |
| 1965 | start = make_number (start_int); |
| 1966 | end = make_number (end_int); |
| 1967 | preserve_marker = Qnil; |
| 1968 | start_marker = Qnil; |
| 1969 | end_marker = Qnil; |
| 1970 | GCPRO3 (preserve_marker, start_marker, end_marker); |
| 1971 | |
| 1972 | specbind (Qinhibit_modification_hooks, Qt); |
| 1973 | |
| 1974 | /* If buffer is unmodified, run a special hook for that case. The |
| 1975 | check for Vfirst_change_hook is just a minor optimization. */ |
| 1976 | if (SAVE_MODIFF >= MODIFF |
| 1977 | && !NILP (Vfirst_change_hook)) |
| 1978 | { |
| 1979 | PRESERVE_VALUE; |
| 1980 | PRESERVE_START_END; |
| 1981 | Frun_hooks (1, &Qfirst_change_hook); |
| 1982 | } |
| 1983 | |
| 1984 | /* Now run the before-change-functions if any. */ |
| 1985 | if (!NILP (Vbefore_change_functions)) |
| 1986 | { |
| 1987 | Lisp_Object args[3]; |
| 1988 | rvoe_arg.location = &Vbefore_change_functions; |
| 1989 | rvoe_arg.errorp = 1; |
| 1990 | |
| 1991 | PRESERVE_VALUE; |
| 1992 | PRESERVE_START_END; |
| 1993 | |
| 1994 | /* Mark before-change-functions to be reset to nil in case of error. */ |
| 1995 | record_unwind_protect_ptr (reset_var_on_error, &rvoe_arg); |
| 1996 | |
| 1997 | /* Actually run the hook functions. */ |
| 1998 | args[0] = Qbefore_change_functions; |
| 1999 | args[1] = FETCH_START; |
| 2000 | args[2] = FETCH_END; |
| 2001 | Frun_hook_with_args (3, args); |
| 2002 | |
| 2003 | /* There was no error: unarm the reset_on_error. */ |
| 2004 | rvoe_arg.errorp = 0; |
| 2005 | } |
| 2006 | |
| 2007 | if (buffer_has_overlays ()) |
| 2008 | { |
| 2009 | PRESERVE_VALUE; |
| 2010 | report_overlay_modification (FETCH_START, FETCH_END, 0, |
| 2011 | FETCH_START, FETCH_END, Qnil); |
| 2012 | } |
| 2013 | |
| 2014 | if (! NILP (start_marker)) |
| 2015 | free_marker (start_marker); |
| 2016 | if (! NILP (end_marker)) |
| 2017 | free_marker (end_marker); |
| 2018 | RESTORE_VALUE; |
| 2019 | UNGCPRO; |
| 2020 | |
| 2021 | unbind_to (count, Qnil); |
| 2022 | } |
| 2023 | |
| 2024 | /* Signal a change immediately after it happens. |
| 2025 | CHARPOS is the character position of the start of the changed text. |
| 2026 | LENDEL is the number of characters of the text before the change. |
| 2027 | (Not the whole buffer; just the part that was changed.) |
| 2028 | LENINS is the number of characters in that part of the text |
| 2029 | after the change. */ |
| 2030 | |
| 2031 | void |
| 2032 | signal_after_change (ptrdiff_t charpos, ptrdiff_t lendel, ptrdiff_t lenins) |
| 2033 | { |
| 2034 | ptrdiff_t count = SPECPDL_INDEX (); |
| 2035 | struct rvoe_arg rvoe_arg; |
| 2036 | |
| 2037 | if (inhibit_modification_hooks) |
| 2038 | return; |
| 2039 | |
| 2040 | /* If we are deferring calls to the after-change functions |
| 2041 | and there are no before-change functions, |
| 2042 | just record the args that we were going to use. */ |
| 2043 | if (! NILP (Vcombine_after_change_calls) |
| 2044 | && NILP (Vbefore_change_functions) |
| 2045 | && !buffer_has_overlays ()) |
| 2046 | { |
| 2047 | Lisp_Object elt; |
| 2048 | |
| 2049 | if (!NILP (combine_after_change_list) |
| 2050 | && current_buffer != XBUFFER (combine_after_change_buffer)) |
| 2051 | Fcombine_after_change_execute (); |
| 2052 | |
| 2053 | elt = list3i (charpos - BEG, Z - (charpos - lendel + lenins), |
| 2054 | lenins - lendel); |
| 2055 | combine_after_change_list |
| 2056 | = Fcons (elt, combine_after_change_list); |
| 2057 | combine_after_change_buffer = Fcurrent_buffer (); |
| 2058 | |
| 2059 | return; |
| 2060 | } |
| 2061 | |
| 2062 | if (!NILP (combine_after_change_list)) |
| 2063 | Fcombine_after_change_execute (); |
| 2064 | |
| 2065 | specbind (Qinhibit_modification_hooks, Qt); |
| 2066 | |
| 2067 | if (!NILP (Vafter_change_functions)) |
| 2068 | { |
| 2069 | Lisp_Object args[4]; |
| 2070 | rvoe_arg.location = &Vafter_change_functions; |
| 2071 | rvoe_arg.errorp = 1; |
| 2072 | |
| 2073 | /* Mark after-change-functions to be reset to nil in case of error. */ |
| 2074 | record_unwind_protect_ptr (reset_var_on_error, &rvoe_arg); |
| 2075 | |
| 2076 | /* Actually run the hook functions. */ |
| 2077 | args[0] = Qafter_change_functions; |
| 2078 | XSETFASTINT (args[1], charpos); |
| 2079 | XSETFASTINT (args[2], charpos + lenins); |
| 2080 | XSETFASTINT (args[3], lendel); |
| 2081 | Frun_hook_with_args (4, args); |
| 2082 | |
| 2083 | /* There was no error: unarm the reset_on_error. */ |
| 2084 | rvoe_arg.errorp = 0; |
| 2085 | } |
| 2086 | |
| 2087 | if (buffer_has_overlays ()) |
| 2088 | report_overlay_modification (make_number (charpos), |
| 2089 | make_number (charpos + lenins), |
| 2090 | 1, |
| 2091 | make_number (charpos), |
| 2092 | make_number (charpos + lenins), |
| 2093 | make_number (lendel)); |
| 2094 | |
| 2095 | /* After an insertion, call the text properties |
| 2096 | insert-behind-hooks or insert-in-front-hooks. */ |
| 2097 | if (lendel == 0) |
| 2098 | report_interval_modification (make_number (charpos), |
| 2099 | make_number (charpos + lenins)); |
| 2100 | |
| 2101 | unbind_to (count, Qnil); |
| 2102 | } |
| 2103 | |
| 2104 | static void |
| 2105 | Fcombine_after_change_execute_1 (Lisp_Object val) |
| 2106 | { |
| 2107 | Vcombine_after_change_calls = val; |
| 2108 | } |
| 2109 | |
| 2110 | DEFUN ("combine-after-change-execute", Fcombine_after_change_execute, |
| 2111 | Scombine_after_change_execute, 0, 0, 0, |
| 2112 | doc: /* This function is for use internally in the function `combine-after-change-calls'. */) |
| 2113 | (void) |
| 2114 | { |
| 2115 | ptrdiff_t count = SPECPDL_INDEX (); |
| 2116 | ptrdiff_t beg, end, change; |
| 2117 | ptrdiff_t begpos, endpos; |
| 2118 | Lisp_Object tail; |
| 2119 | |
| 2120 | if (NILP (combine_after_change_list)) |
| 2121 | return Qnil; |
| 2122 | |
| 2123 | /* It is rare for combine_after_change_buffer to be invalid, but |
| 2124 | possible. It can happen when combine-after-change-calls is |
| 2125 | non-nil, and insertion calls a file handler (e.g. through |
| 2126 | lock_file) which scribbles into a temp file -- cyd */ |
| 2127 | if (!BUFFERP (combine_after_change_buffer) |
| 2128 | || !BUFFER_LIVE_P (XBUFFER (combine_after_change_buffer))) |
| 2129 | { |
| 2130 | combine_after_change_list = Qnil; |
| 2131 | return Qnil; |
| 2132 | } |
| 2133 | |
| 2134 | record_unwind_current_buffer (); |
| 2135 | |
| 2136 | Fset_buffer (combine_after_change_buffer); |
| 2137 | |
| 2138 | /* # chars unchanged at beginning of buffer. */ |
| 2139 | beg = Z - BEG; |
| 2140 | /* # chars unchanged at end of buffer. */ |
| 2141 | end = beg; |
| 2142 | /* Total amount of insertion (negative for deletion). */ |
| 2143 | change = 0; |
| 2144 | |
| 2145 | /* Scan the various individual changes, |
| 2146 | accumulating the range info in BEG, END and CHANGE. */ |
| 2147 | for (tail = combine_after_change_list; CONSP (tail); |
| 2148 | tail = XCDR (tail)) |
| 2149 | { |
| 2150 | Lisp_Object elt; |
| 2151 | ptrdiff_t thisbeg, thisend, thischange; |
| 2152 | |
| 2153 | /* Extract the info from the next element. */ |
| 2154 | elt = XCAR (tail); |
| 2155 | if (! CONSP (elt)) |
| 2156 | continue; |
| 2157 | thisbeg = XINT (XCAR (elt)); |
| 2158 | |
| 2159 | elt = XCDR (elt); |
| 2160 | if (! CONSP (elt)) |
| 2161 | continue; |
| 2162 | thisend = XINT (XCAR (elt)); |
| 2163 | |
| 2164 | elt = XCDR (elt); |
| 2165 | if (! CONSP (elt)) |
| 2166 | continue; |
| 2167 | thischange = XINT (XCAR (elt)); |
| 2168 | |
| 2169 | /* Merge this range into the accumulated range. */ |
| 2170 | change += thischange; |
| 2171 | if (thisbeg < beg) |
| 2172 | beg = thisbeg; |
| 2173 | if (thisend < end) |
| 2174 | end = thisend; |
| 2175 | } |
| 2176 | |
| 2177 | /* Get the current start and end positions of the range |
| 2178 | that was changed. */ |
| 2179 | begpos = BEG + beg; |
| 2180 | endpos = Z - end; |
| 2181 | |
| 2182 | /* We are about to handle these, so discard them. */ |
| 2183 | combine_after_change_list = Qnil; |
| 2184 | |
| 2185 | /* Now run the after-change functions for real. |
| 2186 | Turn off the flag that defers them. */ |
| 2187 | record_unwind_protect (Fcombine_after_change_execute_1, |
| 2188 | Vcombine_after_change_calls); |
| 2189 | signal_after_change (begpos, endpos - begpos - change, endpos - begpos); |
| 2190 | update_compositions (begpos, endpos, CHECK_ALL); |
| 2191 | |
| 2192 | return unbind_to (count, Qnil); |
| 2193 | } |
| 2194 | \f |
| 2195 | void |
| 2196 | syms_of_insdel (void) |
| 2197 | { |
| 2198 | staticpro (&combine_after_change_list); |
| 2199 | staticpro (&combine_after_change_buffer); |
| 2200 | combine_after_change_list = Qnil; |
| 2201 | combine_after_change_buffer = Qnil; |
| 2202 | |
| 2203 | DEFVAR_LISP ("combine-after-change-calls", Vcombine_after_change_calls, |
| 2204 | doc: /* Used internally by the function `combine-after-change-calls' macro. */); |
| 2205 | Vcombine_after_change_calls = Qnil; |
| 2206 | |
| 2207 | DEFVAR_BOOL ("inhibit-modification-hooks", inhibit_modification_hooks, |
| 2208 | doc: /* Non-nil means don't run any of the hooks that respond to buffer changes. |
| 2209 | This affects `before-change-functions' and `after-change-functions', |
| 2210 | as well as hooks attached to text properties and overlays. */); |
| 2211 | inhibit_modification_hooks = 0; |
| 2212 | DEFSYM (Qinhibit_modification_hooks, "inhibit-modification-hooks"); |
| 2213 | |
| 2214 | DEFSYM (Qregion_extract_function, "region-extract-function"); |
| 2215 | |
| 2216 | defsubr (&Scombine_after_change_execute); |
| 2217 | } |