| 1 | /* Code for doing intervals. |
| 2 | Copyright (C) 1993-1995, 1997-1998, 2001-2013 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 | /* NOTES: |
| 22 | |
| 23 | Have to ensure that we can't put symbol nil on a plist, or some |
| 24 | functions may work incorrectly. |
| 25 | |
| 26 | An idea: Have the owner of the tree keep count of splits and/or |
| 27 | insertion lengths (in intervals), and balance after every N. |
| 28 | |
| 29 | Need to call *_left_hook when buffer is killed. |
| 30 | |
| 31 | Scan for zero-length, or 0-length to see notes about handling |
| 32 | zero length interval-markers. |
| 33 | |
| 34 | There are comments around about freeing intervals. It might be |
| 35 | faster to explicitly free them (put them on the free list) than |
| 36 | to GC them. |
| 37 | |
| 38 | */ |
| 39 | |
| 40 | |
| 41 | #include <config.h> |
| 42 | |
| 43 | #define INTERVALS_INLINE EXTERN_INLINE |
| 44 | |
| 45 | #include <intprops.h> |
| 46 | #include "lisp.h" |
| 47 | #include "intervals.h" |
| 48 | #include "character.h" |
| 49 | #include "buffer.h" |
| 50 | #include "puresize.h" |
| 51 | #include "keyboard.h" |
| 52 | #include "keymap.h" |
| 53 | |
| 54 | /* Test for membership, allowing for t (actually any non-cons) to mean the |
| 55 | universal set. */ |
| 56 | |
| 57 | #define TMEM(sym, set) (CONSP (set) ? ! NILP (Fmemq (sym, set)) : ! NILP (set)) |
| 58 | |
| 59 | static Lisp_Object merge_properties_sticky (Lisp_Object, Lisp_Object); |
| 60 | static INTERVAL merge_interval_right (INTERVAL); |
| 61 | static INTERVAL reproduce_tree (INTERVAL, INTERVAL); |
| 62 | \f |
| 63 | /* Utility functions for intervals. */ |
| 64 | |
| 65 | /* Use these functions to set Lisp_Object |
| 66 | or pointer slots of struct interval. */ |
| 67 | |
| 68 | static void |
| 69 | set_interval_object (INTERVAL i, Lisp_Object obj) |
| 70 | { |
| 71 | eassert (BUFFERP (obj) || STRINGP (obj)); |
| 72 | i->up_obj = 1; |
| 73 | i->up.obj = obj; |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | set_interval_left (INTERVAL i, INTERVAL left) |
| 78 | { |
| 79 | i->left = left; |
| 80 | } |
| 81 | |
| 82 | static void |
| 83 | set_interval_right (INTERVAL i, INTERVAL right) |
| 84 | { |
| 85 | i->right = right; |
| 86 | } |
| 87 | |
| 88 | /* Make the parent of D be whatever the parent of S is, regardless |
| 89 | of the type. This is used when balancing an interval tree. */ |
| 90 | |
| 91 | static void |
| 92 | copy_interval_parent (INTERVAL d, INTERVAL s) |
| 93 | { |
| 94 | d->up = s->up; |
| 95 | d->up_obj = s->up_obj; |
| 96 | } |
| 97 | |
| 98 | /* Create the root interval of some object, a buffer or string. */ |
| 99 | |
| 100 | INTERVAL |
| 101 | create_root_interval (Lisp_Object parent) |
| 102 | { |
| 103 | INTERVAL new; |
| 104 | |
| 105 | CHECK_IMPURE (parent); |
| 106 | |
| 107 | new = make_interval (); |
| 108 | |
| 109 | if (BUFFERP (parent)) |
| 110 | { |
| 111 | new->total_length = (BUF_Z (XBUFFER (parent)) |
| 112 | - BUF_BEG (XBUFFER (parent))); |
| 113 | eassert (TOTAL_LENGTH (new) >= 0); |
| 114 | set_buffer_intervals (XBUFFER (parent), new); |
| 115 | new->position = BEG; |
| 116 | } |
| 117 | else if (STRINGP (parent)) |
| 118 | { |
| 119 | new->total_length = SCHARS (parent); |
| 120 | eassert (TOTAL_LENGTH (new) >= 0); |
| 121 | set_string_intervals (parent, new); |
| 122 | new->position = 0; |
| 123 | } |
| 124 | |
| 125 | set_interval_object (new, parent); |
| 126 | |
| 127 | return new; |
| 128 | } |
| 129 | |
| 130 | /* Make the interval TARGET have exactly the properties of SOURCE */ |
| 131 | |
| 132 | void |
| 133 | copy_properties (register INTERVAL source, register INTERVAL target) |
| 134 | { |
| 135 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) |
| 136 | return; |
| 137 | |
| 138 | COPY_INTERVAL_CACHE (source, target); |
| 139 | set_interval_plist (target, Fcopy_sequence (source->plist)); |
| 140 | } |
| 141 | |
| 142 | /* Merge the properties of interval SOURCE into the properties |
| 143 | of interval TARGET. That is to say, each property in SOURCE |
| 144 | is added to TARGET if TARGET has no such property as yet. */ |
| 145 | |
| 146 | static void |
| 147 | merge_properties (register INTERVAL source, register INTERVAL target) |
| 148 | { |
| 149 | register Lisp_Object o, sym, val; |
| 150 | |
| 151 | if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target)) |
| 152 | return; |
| 153 | |
| 154 | MERGE_INTERVAL_CACHE (source, target); |
| 155 | |
| 156 | o = source->plist; |
| 157 | while (CONSP (o)) |
| 158 | { |
| 159 | sym = XCAR (o); |
| 160 | o = XCDR (o); |
| 161 | CHECK_CONS (o); |
| 162 | |
| 163 | val = target->plist; |
| 164 | while (CONSP (val) && !EQ (XCAR (val), sym)) |
| 165 | { |
| 166 | val = XCDR (val); |
| 167 | if (!CONSP (val)) |
| 168 | break; |
| 169 | val = XCDR (val); |
| 170 | } |
| 171 | |
| 172 | if (NILP (val)) |
| 173 | { |
| 174 | val = XCAR (o); |
| 175 | set_interval_plist (target, Fcons (sym, Fcons (val, target->plist))); |
| 176 | } |
| 177 | o = XCDR (o); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | /* Return true if the two intervals have the same properties. */ |
| 182 | |
| 183 | bool |
| 184 | intervals_equal (INTERVAL i0, INTERVAL i1) |
| 185 | { |
| 186 | Lisp_Object i0_cdr, i0_sym; |
| 187 | Lisp_Object i1_cdr, i1_val; |
| 188 | |
| 189 | if (DEFAULT_INTERVAL_P (i0) && DEFAULT_INTERVAL_P (i1)) |
| 190 | return 1; |
| 191 | |
| 192 | if (DEFAULT_INTERVAL_P (i0) || DEFAULT_INTERVAL_P (i1)) |
| 193 | return 0; |
| 194 | |
| 195 | i0_cdr = i0->plist; |
| 196 | i1_cdr = i1->plist; |
| 197 | while (CONSP (i0_cdr) && CONSP (i1_cdr)) |
| 198 | { |
| 199 | i0_sym = XCAR (i0_cdr); |
| 200 | i0_cdr = XCDR (i0_cdr); |
| 201 | if (!CONSP (i0_cdr)) |
| 202 | return 0; |
| 203 | i1_val = i1->plist; |
| 204 | while (CONSP (i1_val) && !EQ (XCAR (i1_val), i0_sym)) |
| 205 | { |
| 206 | i1_val = XCDR (i1_val); |
| 207 | if (!CONSP (i1_val)) |
| 208 | return 0; |
| 209 | i1_val = XCDR (i1_val); |
| 210 | } |
| 211 | |
| 212 | /* i0 has something i1 doesn't. */ |
| 213 | if (EQ (i1_val, Qnil)) |
| 214 | return 0; |
| 215 | |
| 216 | /* i0 and i1 both have sym, but it has different values in each. */ |
| 217 | if (!CONSP (i1_val) |
| 218 | || (i1_val = XCDR (i1_val), !CONSP (i1_val)) |
| 219 | || !EQ (XCAR (i1_val), XCAR (i0_cdr))) |
| 220 | return 0; |
| 221 | |
| 222 | i0_cdr = XCDR (i0_cdr); |
| 223 | |
| 224 | i1_cdr = XCDR (i1_cdr); |
| 225 | if (!CONSP (i1_cdr)) |
| 226 | return 0; |
| 227 | i1_cdr = XCDR (i1_cdr); |
| 228 | } |
| 229 | |
| 230 | /* Lengths of the two plists were equal. */ |
| 231 | return (NILP (i0_cdr) && NILP (i1_cdr)); |
| 232 | } |
| 233 | \f |
| 234 | |
| 235 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
| 236 | No guarantee is made about the order of traversal. |
| 237 | Pass FUNCTION two args: an interval, and ARG. */ |
| 238 | |
| 239 | void |
| 240 | traverse_intervals_noorder (INTERVAL tree, void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
| 241 | { |
| 242 | /* Minimize stack usage. */ |
| 243 | while (tree) |
| 244 | { |
| 245 | (*function) (tree, arg); |
| 246 | if (!tree->right) |
| 247 | tree = tree->left; |
| 248 | else |
| 249 | { |
| 250 | traverse_intervals_noorder (tree->left, function, arg); |
| 251 | tree = tree->right; |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /* Traverse an interval tree TREE, performing FUNCTION on each node. |
| 257 | Pass FUNCTION two args: an interval, and ARG. */ |
| 258 | |
| 259 | void |
| 260 | traverse_intervals (INTERVAL tree, ptrdiff_t position, |
| 261 | void (*function) (INTERVAL, Lisp_Object), Lisp_Object arg) |
| 262 | { |
| 263 | while (tree) |
| 264 | { |
| 265 | traverse_intervals (tree->left, position, function, arg); |
| 266 | position += LEFT_TOTAL_LENGTH (tree); |
| 267 | tree->position = position; |
| 268 | (*function) (tree, arg); |
| 269 | position += LENGTH (tree); tree = tree->right; |
| 270 | } |
| 271 | } |
| 272 | \f |
| 273 | #if 0 |
| 274 | |
| 275 | static int icount; |
| 276 | static int idepth; |
| 277 | static int zero_length; |
| 278 | |
| 279 | /* These functions are temporary, for debugging purposes only. */ |
| 280 | |
| 281 | INTERVAL search_interval, found_interval; |
| 282 | |
| 283 | void |
| 284 | check_for_interval (INTERVAL i) |
| 285 | { |
| 286 | if (i == search_interval) |
| 287 | { |
| 288 | found_interval = i; |
| 289 | icount++; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | INTERVAL |
| 294 | search_for_interval (INTERVAL i, INTERVAL tree) |
| 295 | { |
| 296 | icount = 0; |
| 297 | search_interval = i; |
| 298 | found_interval = NULL; |
| 299 | traverse_intervals_noorder (tree, &check_for_interval, Qnil); |
| 300 | return found_interval; |
| 301 | } |
| 302 | |
| 303 | static void |
| 304 | inc_interval_count (INTERVAL i) |
| 305 | { |
| 306 | icount++; |
| 307 | if (LENGTH (i) == 0) |
| 308 | zero_length++; |
| 309 | if (depth > idepth) |
| 310 | idepth = depth; |
| 311 | } |
| 312 | |
| 313 | int |
| 314 | count_intervals (INTERVAL i) |
| 315 | { |
| 316 | icount = 0; |
| 317 | idepth = 0; |
| 318 | zero_length = 0; |
| 319 | traverse_intervals_noorder (i, &inc_interval_count, Qnil); |
| 320 | |
| 321 | return icount; |
| 322 | } |
| 323 | |
| 324 | static INTERVAL |
| 325 | root_interval (INTERVAL interval) |
| 326 | { |
| 327 | register INTERVAL i = interval; |
| 328 | |
| 329 | while (! ROOT_INTERVAL_P (i)) |
| 330 | i = INTERVAL_PARENT (i); |
| 331 | |
| 332 | return i; |
| 333 | } |
| 334 | #endif |
| 335 | \f |
| 336 | /* Assuming that a left child exists, perform the following operation: |
| 337 | |
| 338 | A B |
| 339 | / \ / \ |
| 340 | B => A |
| 341 | / \ / \ |
| 342 | c c |
| 343 | */ |
| 344 | |
| 345 | static INTERVAL |
| 346 | rotate_right (INTERVAL interval) |
| 347 | { |
| 348 | INTERVAL i; |
| 349 | INTERVAL B = interval->left; |
| 350 | ptrdiff_t old_total = interval->total_length; |
| 351 | |
| 352 | /* Deal with any Parent of A; make it point to B. */ |
| 353 | if (! ROOT_INTERVAL_P (interval)) |
| 354 | { |
| 355 | if (AM_LEFT_CHILD (interval)) |
| 356 | set_interval_left (INTERVAL_PARENT (interval), B); |
| 357 | else |
| 358 | set_interval_right (INTERVAL_PARENT (interval), B); |
| 359 | } |
| 360 | copy_interval_parent (B, interval); |
| 361 | |
| 362 | /* Make B the parent of A */ |
| 363 | i = B->right; |
| 364 | set_interval_right (B, interval); |
| 365 | set_interval_parent (interval, B); |
| 366 | |
| 367 | /* Make A point to c */ |
| 368 | set_interval_left (interval, i); |
| 369 | if (i) |
| 370 | set_interval_parent (i, interval); |
| 371 | |
| 372 | /* A's total length is decreased by the length of B and its left child. */ |
| 373 | interval->total_length -= B->total_length - LEFT_TOTAL_LENGTH (interval); |
| 374 | eassert (TOTAL_LENGTH (interval) >= 0); |
| 375 | |
| 376 | /* B must have the same total length of A. */ |
| 377 | B->total_length = old_total; |
| 378 | eassert (TOTAL_LENGTH (B) >= 0); |
| 379 | |
| 380 | return B; |
| 381 | } |
| 382 | |
| 383 | /* Assuming that a right child exists, perform the following operation: |
| 384 | |
| 385 | A B |
| 386 | / \ / \ |
| 387 | B => A |
| 388 | / \ / \ |
| 389 | c c |
| 390 | */ |
| 391 | |
| 392 | static INTERVAL |
| 393 | rotate_left (INTERVAL interval) |
| 394 | { |
| 395 | INTERVAL i; |
| 396 | INTERVAL B = interval->right; |
| 397 | ptrdiff_t old_total = interval->total_length; |
| 398 | |
| 399 | /* Deal with any parent of A; make it point to B. */ |
| 400 | if (! ROOT_INTERVAL_P (interval)) |
| 401 | { |
| 402 | if (AM_LEFT_CHILD (interval)) |
| 403 | set_interval_left (INTERVAL_PARENT (interval), B); |
| 404 | else |
| 405 | set_interval_right (INTERVAL_PARENT (interval), B); |
| 406 | } |
| 407 | copy_interval_parent (B, interval); |
| 408 | |
| 409 | /* Make B the parent of A */ |
| 410 | i = B->left; |
| 411 | set_interval_left (B, interval); |
| 412 | set_interval_parent (interval, B); |
| 413 | |
| 414 | /* Make A point to c */ |
| 415 | set_interval_right (interval, i); |
| 416 | if (i) |
| 417 | set_interval_parent (i, interval); |
| 418 | |
| 419 | /* A's total length is decreased by the length of B and its right child. */ |
| 420 | interval->total_length -= B->total_length - RIGHT_TOTAL_LENGTH (interval); |
| 421 | eassert (TOTAL_LENGTH (interval) >= 0); |
| 422 | |
| 423 | /* B must have the same total length of A. */ |
| 424 | B->total_length = old_total; |
| 425 | eassert (TOTAL_LENGTH (B) >= 0); |
| 426 | |
| 427 | return B; |
| 428 | } |
| 429 | \f |
| 430 | /* Balance an interval tree with the assumption that the subtrees |
| 431 | themselves are already balanced. */ |
| 432 | |
| 433 | static INTERVAL |
| 434 | balance_an_interval (INTERVAL i) |
| 435 | { |
| 436 | register ptrdiff_t old_diff, new_diff; |
| 437 | |
| 438 | while (1) |
| 439 | { |
| 440 | old_diff = LEFT_TOTAL_LENGTH (i) - RIGHT_TOTAL_LENGTH (i); |
| 441 | if (old_diff > 0) |
| 442 | { |
| 443 | /* Since the left child is longer, there must be one. */ |
| 444 | new_diff = i->total_length - i->left->total_length |
| 445 | + RIGHT_TOTAL_LENGTH (i->left) - LEFT_TOTAL_LENGTH (i->left); |
| 446 | if (eabs (new_diff) >= old_diff) |
| 447 | break; |
| 448 | i = rotate_right (i); |
| 449 | balance_an_interval (i->right); |
| 450 | } |
| 451 | else if (old_diff < 0) |
| 452 | { |
| 453 | /* Since the right child is longer, there must be one. */ |
| 454 | new_diff = i->total_length - i->right->total_length |
| 455 | + LEFT_TOTAL_LENGTH (i->right) - RIGHT_TOTAL_LENGTH (i->right); |
| 456 | if (eabs (new_diff) >= -old_diff) |
| 457 | break; |
| 458 | i = rotate_left (i); |
| 459 | balance_an_interval (i->left); |
| 460 | } |
| 461 | else |
| 462 | break; |
| 463 | } |
| 464 | return i; |
| 465 | } |
| 466 | |
| 467 | /* Balance INTERVAL, potentially stuffing it back into its parent |
| 468 | Lisp Object. */ |
| 469 | |
| 470 | static INTERVAL |
| 471 | balance_possible_root_interval (INTERVAL interval) |
| 472 | { |
| 473 | Lisp_Object parent; |
| 474 | bool have_parent = 0; |
| 475 | |
| 476 | if (!INTERVAL_HAS_OBJECT (interval) && !INTERVAL_HAS_PARENT (interval)) |
| 477 | return interval; |
| 478 | |
| 479 | if (INTERVAL_HAS_OBJECT (interval)) |
| 480 | { |
| 481 | have_parent = 1; |
| 482 | GET_INTERVAL_OBJECT (parent, interval); |
| 483 | } |
| 484 | interval = balance_an_interval (interval); |
| 485 | |
| 486 | if (have_parent) |
| 487 | { |
| 488 | if (BUFFERP (parent)) |
| 489 | set_buffer_intervals (XBUFFER (parent), interval); |
| 490 | else if (STRINGP (parent)) |
| 491 | set_string_intervals (parent, interval); |
| 492 | } |
| 493 | |
| 494 | return interval; |
| 495 | } |
| 496 | |
| 497 | /* Balance the interval tree TREE. Balancing is by weight |
| 498 | (the amount of text). */ |
| 499 | |
| 500 | static INTERVAL |
| 501 | balance_intervals_internal (register INTERVAL tree) |
| 502 | { |
| 503 | /* Balance within each side. */ |
| 504 | if (tree->left) |
| 505 | balance_intervals_internal (tree->left); |
| 506 | if (tree->right) |
| 507 | balance_intervals_internal (tree->right); |
| 508 | return balance_an_interval (tree); |
| 509 | } |
| 510 | |
| 511 | /* Advertised interface to balance intervals. */ |
| 512 | |
| 513 | INTERVAL |
| 514 | balance_intervals (INTERVAL tree) |
| 515 | { |
| 516 | return tree ? balance_intervals_internal (tree) : NULL; |
| 517 | } |
| 518 | |
| 519 | /* Rebalance text properties of B. */ |
| 520 | |
| 521 | static void |
| 522 | buffer_balance_intervals (struct buffer *b) |
| 523 | { |
| 524 | INTERVAL i; |
| 525 | |
| 526 | eassert (b != NULL); |
| 527 | i = buffer_intervals (b); |
| 528 | if (i) |
| 529 | set_buffer_intervals (b, balance_an_interval (i)); |
| 530 | } |
| 531 | |
| 532 | /* Split INTERVAL into two pieces, starting the second piece at |
| 533 | character position OFFSET (counting from 0), relative to INTERVAL. |
| 534 | INTERVAL becomes the left-hand piece, and the right-hand piece |
| 535 | (second, lexicographically) is returned. |
| 536 | |
| 537 | The size and position fields of the two intervals are set based upon |
| 538 | those of the original interval. The property list of the new interval |
| 539 | is reset, thus it is up to the caller to do the right thing with the |
| 540 | result. |
| 541 | |
| 542 | Note that this does not change the position of INTERVAL; if it is a root, |
| 543 | it is still a root after this operation. */ |
| 544 | |
| 545 | INTERVAL |
| 546 | split_interval_right (INTERVAL interval, ptrdiff_t offset) |
| 547 | { |
| 548 | INTERVAL new = make_interval (); |
| 549 | ptrdiff_t position = interval->position; |
| 550 | ptrdiff_t new_length = LENGTH (interval) - offset; |
| 551 | |
| 552 | new->position = position + offset; |
| 553 | set_interval_parent (new, interval); |
| 554 | |
| 555 | if (NULL_RIGHT_CHILD (interval)) |
| 556 | { |
| 557 | set_interval_right (interval, new); |
| 558 | new->total_length = new_length; |
| 559 | eassert (TOTAL_LENGTH (new) >= 0); |
| 560 | } |
| 561 | else |
| 562 | { |
| 563 | /* Insert the new node between INTERVAL and its right child. */ |
| 564 | set_interval_right (new, interval->right); |
| 565 | set_interval_parent (interval->right, new); |
| 566 | set_interval_right (interval, new); |
| 567 | new->total_length = new_length + new->right->total_length; |
| 568 | eassert (TOTAL_LENGTH (new) >= 0); |
| 569 | balance_an_interval (new); |
| 570 | } |
| 571 | |
| 572 | balance_possible_root_interval (interval); |
| 573 | |
| 574 | return new; |
| 575 | } |
| 576 | |
| 577 | /* Split INTERVAL into two pieces, starting the second piece at |
| 578 | character position OFFSET (counting from 0), relative to INTERVAL. |
| 579 | INTERVAL becomes the right-hand piece, and the left-hand piece |
| 580 | (first, lexicographically) is returned. |
| 581 | |
| 582 | The size and position fields of the two intervals are set based upon |
| 583 | those of the original interval. The property list of the new interval |
| 584 | is reset, thus it is up to the caller to do the right thing with the |
| 585 | result. |
| 586 | |
| 587 | Note that this does not change the position of INTERVAL; if it is a root, |
| 588 | it is still a root after this operation. */ |
| 589 | |
| 590 | INTERVAL |
| 591 | split_interval_left (INTERVAL interval, ptrdiff_t offset) |
| 592 | { |
| 593 | INTERVAL new = make_interval (); |
| 594 | ptrdiff_t new_length = offset; |
| 595 | |
| 596 | new->position = interval->position; |
| 597 | interval->position = interval->position + offset; |
| 598 | set_interval_parent (new, interval); |
| 599 | |
| 600 | if (NULL_LEFT_CHILD (interval)) |
| 601 | { |
| 602 | set_interval_left (interval, new); |
| 603 | new->total_length = new_length; |
| 604 | eassert (TOTAL_LENGTH (new) >= 0); |
| 605 | } |
| 606 | else |
| 607 | { |
| 608 | /* Insert the new node between INTERVAL and its left child. */ |
| 609 | set_interval_left (new, interval->left); |
| 610 | set_interval_parent (new->left, new); |
| 611 | set_interval_left (interval, new); |
| 612 | new->total_length = new_length + new->left->total_length; |
| 613 | eassert (TOTAL_LENGTH (new) >= 0); |
| 614 | balance_an_interval (new); |
| 615 | } |
| 616 | |
| 617 | balance_possible_root_interval (interval); |
| 618 | |
| 619 | return new; |
| 620 | } |
| 621 | \f |
| 622 | /* Return the proper position for the first character |
| 623 | described by the interval tree SOURCE. |
| 624 | This is 1 if the parent is a buffer, |
| 625 | 0 if the parent is a string or if there is no parent. |
| 626 | |
| 627 | Don't use this function on an interval which is the child |
| 628 | of another interval! */ |
| 629 | |
| 630 | static int |
| 631 | interval_start_pos (INTERVAL source) |
| 632 | { |
| 633 | Lisp_Object parent; |
| 634 | |
| 635 | if (!source) |
| 636 | return 0; |
| 637 | |
| 638 | if (! INTERVAL_HAS_OBJECT (source)) |
| 639 | return 0; |
| 640 | GET_INTERVAL_OBJECT (parent, source); |
| 641 | if (BUFFERP (parent)) |
| 642 | return BUF_BEG (XBUFFER (parent)); |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* Find the interval containing text position POSITION in the text |
| 647 | represented by the interval tree TREE. POSITION is a buffer |
| 648 | position (starting from 1) or a string index (starting from 0). |
| 649 | If POSITION is at the end of the buffer or string, |
| 650 | return the interval containing the last character. |
| 651 | |
| 652 | The `position' field, which is a cache of an interval's position, |
| 653 | is updated in the interval found. Other functions (e.g., next_interval) |
| 654 | will update this cache based on the result of find_interval. */ |
| 655 | |
| 656 | INTERVAL |
| 657 | find_interval (register INTERVAL tree, register ptrdiff_t position) |
| 658 | { |
| 659 | /* The distance from the left edge of the subtree at TREE |
| 660 | to POSITION. */ |
| 661 | register ptrdiff_t relative_position; |
| 662 | |
| 663 | if (!tree) |
| 664 | return NULL; |
| 665 | |
| 666 | relative_position = position; |
| 667 | if (INTERVAL_HAS_OBJECT (tree)) |
| 668 | { |
| 669 | Lisp_Object parent; |
| 670 | GET_INTERVAL_OBJECT (parent, tree); |
| 671 | if (BUFFERP (parent)) |
| 672 | relative_position -= BUF_BEG (XBUFFER (parent)); |
| 673 | } |
| 674 | |
| 675 | eassert (relative_position <= TOTAL_LENGTH (tree)); |
| 676 | |
| 677 | tree = balance_possible_root_interval (tree); |
| 678 | |
| 679 | while (1) |
| 680 | { |
| 681 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
| 682 | { |
| 683 | tree = tree->left; |
| 684 | } |
| 685 | else if (! NULL_RIGHT_CHILD (tree) |
| 686 | && relative_position >= (TOTAL_LENGTH (tree) |
| 687 | - RIGHT_TOTAL_LENGTH (tree))) |
| 688 | { |
| 689 | relative_position -= (TOTAL_LENGTH (tree) |
| 690 | - RIGHT_TOTAL_LENGTH (tree)); |
| 691 | tree = tree->right; |
| 692 | } |
| 693 | else |
| 694 | { |
| 695 | tree->position |
| 696 | = (position - relative_position /* left edge of *tree. */ |
| 697 | + LEFT_TOTAL_LENGTH (tree)); /* left edge of this interval. */ |
| 698 | |
| 699 | return tree; |
| 700 | } |
| 701 | } |
| 702 | } |
| 703 | \f |
| 704 | /* Find the succeeding interval (lexicographically) to INTERVAL. |
| 705 | Sets the `position' field based on that of INTERVAL (see |
| 706 | find_interval). */ |
| 707 | |
| 708 | INTERVAL |
| 709 | next_interval (register INTERVAL interval) |
| 710 | { |
| 711 | register INTERVAL i = interval; |
| 712 | register ptrdiff_t next_position; |
| 713 | |
| 714 | if (!i) |
| 715 | return NULL; |
| 716 | next_position = interval->position + LENGTH (interval); |
| 717 | |
| 718 | if (! NULL_RIGHT_CHILD (i)) |
| 719 | { |
| 720 | i = i->right; |
| 721 | while (! NULL_LEFT_CHILD (i)) |
| 722 | i = i->left; |
| 723 | |
| 724 | i->position = next_position; |
| 725 | return i; |
| 726 | } |
| 727 | |
| 728 | while (! NULL_PARENT (i)) |
| 729 | { |
| 730 | if (AM_LEFT_CHILD (i)) |
| 731 | { |
| 732 | i = INTERVAL_PARENT (i); |
| 733 | i->position = next_position; |
| 734 | return i; |
| 735 | } |
| 736 | |
| 737 | i = INTERVAL_PARENT (i); |
| 738 | } |
| 739 | |
| 740 | return NULL; |
| 741 | } |
| 742 | |
| 743 | /* Find the preceding interval (lexicographically) to INTERVAL. |
| 744 | Sets the `position' field based on that of INTERVAL (see |
| 745 | find_interval). */ |
| 746 | |
| 747 | INTERVAL |
| 748 | previous_interval (register INTERVAL interval) |
| 749 | { |
| 750 | register INTERVAL i; |
| 751 | |
| 752 | if (!interval) |
| 753 | return NULL; |
| 754 | |
| 755 | if (! NULL_LEFT_CHILD (interval)) |
| 756 | { |
| 757 | i = interval->left; |
| 758 | while (! NULL_RIGHT_CHILD (i)) |
| 759 | i = i->right; |
| 760 | |
| 761 | i->position = interval->position - LENGTH (i); |
| 762 | return i; |
| 763 | } |
| 764 | |
| 765 | i = interval; |
| 766 | while (! NULL_PARENT (i)) |
| 767 | { |
| 768 | if (AM_RIGHT_CHILD (i)) |
| 769 | { |
| 770 | i = INTERVAL_PARENT (i); |
| 771 | |
| 772 | i->position = interval->position - LENGTH (i); |
| 773 | return i; |
| 774 | } |
| 775 | i = INTERVAL_PARENT (i); |
| 776 | } |
| 777 | |
| 778 | return NULL; |
| 779 | } |
| 780 | |
| 781 | /* Find the interval containing POS given some non-NULL INTERVAL |
| 782 | in the same tree. Note that we need to update interval->position |
| 783 | if we go down the tree. |
| 784 | To speed up the process, we assume that the ->position of |
| 785 | I and all its parents is already uptodate. */ |
| 786 | INTERVAL |
| 787 | update_interval (register INTERVAL i, ptrdiff_t pos) |
| 788 | { |
| 789 | if (!i) |
| 790 | return NULL; |
| 791 | |
| 792 | while (1) |
| 793 | { |
| 794 | if (pos < i->position) |
| 795 | { |
| 796 | /* Move left. */ |
| 797 | if (pos >= i->position - TOTAL_LENGTH (i->left)) |
| 798 | { |
| 799 | i->left->position = i->position - TOTAL_LENGTH (i->left) |
| 800 | + LEFT_TOTAL_LENGTH (i->left); |
| 801 | i = i->left; /* Move to the left child */ |
| 802 | } |
| 803 | else if (NULL_PARENT (i)) |
| 804 | error ("Point before start of properties"); |
| 805 | else |
| 806 | i = INTERVAL_PARENT (i); |
| 807 | continue; |
| 808 | } |
| 809 | else if (pos >= INTERVAL_LAST_POS (i)) |
| 810 | { |
| 811 | /* Move right. */ |
| 812 | if (pos < INTERVAL_LAST_POS (i) + TOTAL_LENGTH (i->right)) |
| 813 | { |
| 814 | i->right->position = INTERVAL_LAST_POS (i) |
| 815 | + LEFT_TOTAL_LENGTH (i->right); |
| 816 | i = i->right; /* Move to the right child */ |
| 817 | } |
| 818 | else if (NULL_PARENT (i)) |
| 819 | error ("Point %"pD"d after end of properties", pos); |
| 820 | else |
| 821 | i = INTERVAL_PARENT (i); |
| 822 | continue; |
| 823 | } |
| 824 | else |
| 825 | return i; |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | /* Effect an adjustment corresponding to the addition of LENGTH characters |
| 830 | of text. Do this by finding the interval containing POSITION in the |
| 831 | interval tree TREE, and then adjusting all of its ancestors by adding |
| 832 | LENGTH to them. |
| 833 | |
| 834 | If POSITION is the first character of an interval, meaning that point |
| 835 | is actually between the two intervals, make the new text belong to |
| 836 | the interval which is "sticky". |
| 837 | |
| 838 | If both intervals are "sticky", then make them belong to the left-most |
| 839 | interval. Another possibility would be to create a new interval for |
| 840 | this text, and make it have the merged properties of both ends. */ |
| 841 | |
| 842 | static INTERVAL |
| 843 | adjust_intervals_for_insertion (INTERVAL tree, |
| 844 | ptrdiff_t position, ptrdiff_t length) |
| 845 | { |
| 846 | INTERVAL i; |
| 847 | INTERVAL temp; |
| 848 | bool eobp = 0; |
| 849 | Lisp_Object parent; |
| 850 | ptrdiff_t offset; |
| 851 | |
| 852 | eassert (TOTAL_LENGTH (tree) > 0); |
| 853 | |
| 854 | GET_INTERVAL_OBJECT (parent, tree); |
| 855 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
| 856 | |
| 857 | /* If inserting at point-max of a buffer, that position will be out |
| 858 | of range. Remember that buffer positions are 1-based. */ |
| 859 | if (position >= TOTAL_LENGTH (tree) + offset) |
| 860 | { |
| 861 | position = TOTAL_LENGTH (tree) + offset; |
| 862 | eobp = 1; |
| 863 | } |
| 864 | |
| 865 | i = find_interval (tree, position); |
| 866 | |
| 867 | /* If in middle of an interval which is not sticky either way, |
| 868 | we must not just give its properties to the insertion. |
| 869 | So split this interval at the insertion point. |
| 870 | |
| 871 | Originally, the if condition here was this: |
| 872 | (! (position == i->position || eobp) |
| 873 | && END_NONSTICKY_P (i) |
| 874 | && FRONT_NONSTICKY_P (i)) |
| 875 | But, these macros are now unreliable because of introduction of |
| 876 | Vtext_property_default_nonsticky. So, we always check properties |
| 877 | one by one if POSITION is in middle of an interval. */ |
| 878 | if (! (position == i->position || eobp)) |
| 879 | { |
| 880 | Lisp_Object tail; |
| 881 | Lisp_Object front, rear; |
| 882 | |
| 883 | tail = i->plist; |
| 884 | |
| 885 | /* Properties font-sticky and rear-nonsticky override |
| 886 | Vtext_property_default_nonsticky. So, if they are t, we can |
| 887 | skip one by one checking of properties. */ |
| 888 | rear = textget (i->plist, Qrear_nonsticky); |
| 889 | if (! CONSP (rear) && ! NILP (rear)) |
| 890 | { |
| 891 | /* All properties are nonsticky. We split the interval. */ |
| 892 | goto check_done; |
| 893 | } |
| 894 | front = textget (i->plist, Qfront_sticky); |
| 895 | if (! CONSP (front) && ! NILP (front)) |
| 896 | { |
| 897 | /* All properties are sticky. We don't split the interval. */ |
| 898 | tail = Qnil; |
| 899 | goto check_done; |
| 900 | } |
| 901 | |
| 902 | /* Does any actual property pose an actual problem? We break |
| 903 | the loop if we find a nonsticky property. */ |
| 904 | for (; CONSP (tail); tail = Fcdr (XCDR (tail))) |
| 905 | { |
| 906 | Lisp_Object prop, tmp; |
| 907 | prop = XCAR (tail); |
| 908 | |
| 909 | /* Is this particular property front-sticky? */ |
| 910 | if (CONSP (front) && ! NILP (Fmemq (prop, front))) |
| 911 | continue; |
| 912 | |
| 913 | /* Is this particular property rear-nonsticky? */ |
| 914 | if (CONSP (rear) && ! NILP (Fmemq (prop, rear))) |
| 915 | break; |
| 916 | |
| 917 | /* Is this particular property recorded as sticky or |
| 918 | nonsticky in Vtext_property_default_nonsticky? */ |
| 919 | tmp = Fassq (prop, Vtext_property_default_nonsticky); |
| 920 | if (CONSP (tmp)) |
| 921 | { |
| 922 | if (NILP (tmp)) |
| 923 | continue; |
| 924 | break; |
| 925 | } |
| 926 | |
| 927 | /* By default, a text property is rear-sticky, thus we |
| 928 | continue the loop. */ |
| 929 | } |
| 930 | |
| 931 | check_done: |
| 932 | /* If any property is a real problem, split the interval. */ |
| 933 | if (! NILP (tail)) |
| 934 | { |
| 935 | temp = split_interval_right (i, position - i->position); |
| 936 | copy_properties (i, temp); |
| 937 | i = temp; |
| 938 | } |
| 939 | } |
| 940 | |
| 941 | /* If we are positioned between intervals, check the stickiness of |
| 942 | both of them. We have to do this too, if we are at BEG or Z. */ |
| 943 | if (position == i->position || eobp) |
| 944 | { |
| 945 | register INTERVAL prev; |
| 946 | |
| 947 | if (position == BEG) |
| 948 | prev = 0; |
| 949 | else if (eobp) |
| 950 | { |
| 951 | prev = i; |
| 952 | i = 0; |
| 953 | } |
| 954 | else |
| 955 | prev = previous_interval (i); |
| 956 | |
| 957 | /* Even if we are positioned between intervals, we default |
| 958 | to the left one if it exists. We extend it now and split |
| 959 | off a part later, if stickiness demands it. */ |
| 960 | for (temp = prev ? prev : i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
| 961 | { |
| 962 | temp->total_length += length; |
| 963 | eassert (TOTAL_LENGTH (temp) >= 0); |
| 964 | temp = balance_possible_root_interval (temp); |
| 965 | } |
| 966 | |
| 967 | /* If at least one interval has sticky properties, |
| 968 | we check the stickiness property by property. |
| 969 | |
| 970 | Originally, the if condition here was this: |
| 971 | (END_NONSTICKY_P (prev) || FRONT_STICKY_P (i)) |
| 972 | But, these macros are now unreliable because of introduction |
| 973 | of Vtext_property_default_nonsticky. So, we always have to |
| 974 | check stickiness of properties one by one. If cache of |
| 975 | stickiness is implemented in the future, we may be able to |
| 976 | use those macros again. */ |
| 977 | if (1) |
| 978 | { |
| 979 | Lisp_Object pleft, pright; |
| 980 | struct interval newi; |
| 981 | |
| 982 | RESET_INTERVAL (&newi); |
| 983 | pleft = prev ? prev->plist : Qnil; |
| 984 | pright = i ? i->plist : Qnil; |
| 985 | set_interval_plist (&newi, merge_properties_sticky (pleft, pright)); |
| 986 | |
| 987 | if (! prev) /* i.e. position == BEG */ |
| 988 | { |
| 989 | if (! intervals_equal (i, &newi)) |
| 990 | { |
| 991 | i = split_interval_left (i, length); |
| 992 | set_interval_plist (i, newi.plist); |
| 993 | } |
| 994 | } |
| 995 | else if (! intervals_equal (prev, &newi)) |
| 996 | { |
| 997 | prev = split_interval_right (prev, position - prev->position); |
| 998 | set_interval_plist (prev, newi.plist); |
| 999 | if (i && intervals_equal (prev, i)) |
| 1000 | merge_interval_right (prev); |
| 1001 | } |
| 1002 | |
| 1003 | /* We will need to update the cache here later. */ |
| 1004 | } |
| 1005 | else if (! prev && ! NILP (i->plist)) |
| 1006 | { |
| 1007 | /* Just split off a new interval at the left. |
| 1008 | Since I wasn't front-sticky, the empty plist is ok. */ |
| 1009 | i = split_interval_left (i, length); |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | /* Otherwise just extend the interval. */ |
| 1014 | else |
| 1015 | { |
| 1016 | for (temp = i; temp; temp = INTERVAL_PARENT_OR_NULL (temp)) |
| 1017 | { |
| 1018 | temp->total_length += length; |
| 1019 | eassert (TOTAL_LENGTH (temp) >= 0); |
| 1020 | temp = balance_possible_root_interval (temp); |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | return tree; |
| 1025 | } |
| 1026 | |
| 1027 | /* Any property might be front-sticky on the left, rear-sticky on the left, |
| 1028 | front-sticky on the right, or rear-sticky on the right; the 16 combinations |
| 1029 | can be arranged in a matrix with rows denoting the left conditions and |
| 1030 | columns denoting the right conditions: |
| 1031 | _ __ _ |
| 1032 | _ FR FR FR FR |
| 1033 | FR__ 0 1 2 3 |
| 1034 | _FR 4 5 6 7 |
| 1035 | FR 8 9 A B |
| 1036 | FR C D E F |
| 1037 | |
| 1038 | left-props = '(front-sticky (p8 p9 pa pb pc pd pe pf) |
| 1039 | rear-nonsticky (p4 p5 p6 p7 p8 p9 pa pb) |
| 1040 | p0 L p1 L p2 L p3 L p4 L p5 L p6 L p7 L |
| 1041 | p8 L p9 L pa L pb L pc L pd L pe L pf L) |
| 1042 | right-props = '(front-sticky (p2 p3 p6 p7 pa pb pe pf) |
| 1043 | rear-nonsticky (p1 p2 p5 p6 p9 pa pd pe) |
| 1044 | p0 R p1 R p2 R p3 R p4 R p5 R p6 R p7 R |
| 1045 | p8 R p9 R pa R pb R pc R pd R pe R pf R) |
| 1046 | |
| 1047 | We inherit from whoever has a sticky side facing us. If both sides |
| 1048 | do (cases 2, 3, E, and F), then we inherit from whichever side has a |
| 1049 | non-nil value for the current property. If both sides do, then we take |
| 1050 | from the left. |
| 1051 | |
| 1052 | When we inherit a property, we get its stickiness as well as its value. |
| 1053 | So, when we merge the above two lists, we expect to get this: |
| 1054 | |
| 1055 | result = '(front-sticky (p6 p7 pa pb pc pd pe pf) |
| 1056 | rear-nonsticky (p6 pa) |
| 1057 | p0 L p1 L p2 L p3 L p6 R p7 R |
| 1058 | pa R pb R pc L pd L pe L pf L) |
| 1059 | |
| 1060 | The optimizable special cases are: |
| 1061 | left rear-nonsticky = nil, right front-sticky = nil (inherit left) |
| 1062 | left rear-nonsticky = t, right front-sticky = t (inherit right) |
| 1063 | left rear-nonsticky = t, right front-sticky = nil (inherit none) |
| 1064 | */ |
| 1065 | |
| 1066 | static Lisp_Object |
| 1067 | merge_properties_sticky (Lisp_Object pleft, Lisp_Object pright) |
| 1068 | { |
| 1069 | Lisp_Object props, front, rear; |
| 1070 | Lisp_Object lfront, lrear, rfront, rrear; |
| 1071 | Lisp_Object tail1, tail2, sym, lval, rval, cat; |
| 1072 | bool use_left, use_right, lpresent; |
| 1073 | |
| 1074 | props = Qnil; |
| 1075 | front = Qnil; |
| 1076 | rear = Qnil; |
| 1077 | lfront = textget (pleft, Qfront_sticky); |
| 1078 | lrear = textget (pleft, Qrear_nonsticky); |
| 1079 | rfront = textget (pright, Qfront_sticky); |
| 1080 | rrear = textget (pright, Qrear_nonsticky); |
| 1081 | |
| 1082 | /* Go through each element of PRIGHT. */ |
| 1083 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
| 1084 | { |
| 1085 | Lisp_Object tmp; |
| 1086 | |
| 1087 | sym = XCAR (tail1); |
| 1088 | |
| 1089 | /* Sticky properties get special treatment. */ |
| 1090 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) |
| 1091 | continue; |
| 1092 | |
| 1093 | rval = Fcar (XCDR (tail1)); |
| 1094 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) |
| 1095 | if (EQ (sym, XCAR (tail2))) |
| 1096 | break; |
| 1097 | |
| 1098 | /* Indicate whether the property is explicitly defined on the left. |
| 1099 | (We know it is defined explicitly on the right |
| 1100 | because otherwise we don't get here.) */ |
| 1101 | lpresent = ! NILP (tail2); |
| 1102 | lval = (NILP (tail2) ? Qnil : Fcar (Fcdr (tail2))); |
| 1103 | |
| 1104 | /* Even if lrear or rfront say nothing about the stickiness of |
| 1105 | SYM, Vtext_property_default_nonsticky may give default |
| 1106 | stickiness to SYM. */ |
| 1107 | tmp = Fassq (sym, Vtext_property_default_nonsticky); |
| 1108 | use_left = (lpresent |
| 1109 | && ! (TMEM (sym, lrear) |
| 1110 | || (CONSP (tmp) && ! NILP (XCDR (tmp))))); |
| 1111 | use_right = (TMEM (sym, rfront) |
| 1112 | || (CONSP (tmp) && NILP (XCDR (tmp)))); |
| 1113 | if (use_left && use_right) |
| 1114 | { |
| 1115 | if (NILP (lval)) |
| 1116 | use_left = 0; |
| 1117 | else if (NILP (rval)) |
| 1118 | use_right = 0; |
| 1119 | } |
| 1120 | if (use_left) |
| 1121 | { |
| 1122 | /* We build props as (value sym ...) rather than (sym value ...) |
| 1123 | because we plan to nreverse it when we're done. */ |
| 1124 | props = Fcons (lval, Fcons (sym, props)); |
| 1125 | if (TMEM (sym, lfront)) |
| 1126 | front = Fcons (sym, front); |
| 1127 | if (TMEM (sym, lrear)) |
| 1128 | rear = Fcons (sym, rear); |
| 1129 | } |
| 1130 | else if (use_right) |
| 1131 | { |
| 1132 | props = Fcons (rval, Fcons (sym, props)); |
| 1133 | if (TMEM (sym, rfront)) |
| 1134 | front = Fcons (sym, front); |
| 1135 | if (TMEM (sym, rrear)) |
| 1136 | rear = Fcons (sym, rear); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | /* Now go through each element of PLEFT. */ |
| 1141 | for (tail2 = pleft; CONSP (tail2); tail2 = Fcdr (XCDR (tail2))) |
| 1142 | { |
| 1143 | Lisp_Object tmp; |
| 1144 | |
| 1145 | sym = XCAR (tail2); |
| 1146 | |
| 1147 | /* Sticky properties get special treatment. */ |
| 1148 | if (EQ (sym, Qrear_nonsticky) || EQ (sym, Qfront_sticky)) |
| 1149 | continue; |
| 1150 | |
| 1151 | /* If sym is in PRIGHT, we've already considered it. */ |
| 1152 | for (tail1 = pright; CONSP (tail1); tail1 = Fcdr (XCDR (tail1))) |
| 1153 | if (EQ (sym, XCAR (tail1))) |
| 1154 | break; |
| 1155 | if (! NILP (tail1)) |
| 1156 | continue; |
| 1157 | |
| 1158 | lval = Fcar (XCDR (tail2)); |
| 1159 | |
| 1160 | /* Even if lrear or rfront say nothing about the stickiness of |
| 1161 | SYM, Vtext_property_default_nonsticky may give default |
| 1162 | stickiness to SYM. */ |
| 1163 | tmp = Fassq (sym, Vtext_property_default_nonsticky); |
| 1164 | |
| 1165 | /* Since rval is known to be nil in this loop, the test simplifies. */ |
| 1166 | if (! (TMEM (sym, lrear) || (CONSP (tmp) && ! NILP (XCDR (tmp))))) |
| 1167 | { |
| 1168 | props = Fcons (lval, Fcons (sym, props)); |
| 1169 | if (TMEM (sym, lfront)) |
| 1170 | front = Fcons (sym, front); |
| 1171 | } |
| 1172 | else if (TMEM (sym, rfront) || (CONSP (tmp) && NILP (XCDR (tmp)))) |
| 1173 | { |
| 1174 | /* The value is nil, but we still inherit the stickiness |
| 1175 | from the right. */ |
| 1176 | front = Fcons (sym, front); |
| 1177 | if (TMEM (sym, rrear)) |
| 1178 | rear = Fcons (sym, rear); |
| 1179 | } |
| 1180 | } |
| 1181 | props = Fnreverse (props); |
| 1182 | if (! NILP (rear)) |
| 1183 | props = Fcons (Qrear_nonsticky, Fcons (Fnreverse (rear), props)); |
| 1184 | |
| 1185 | cat = textget (props, Qcategory); |
| 1186 | if (! NILP (front) |
| 1187 | && |
| 1188 | /* If we have inherited a front-stick category property that is t, |
| 1189 | we don't need to set up a detailed one. */ |
| 1190 | ! (! NILP (cat) && SYMBOLP (cat) |
| 1191 | && EQ (Fget (cat, Qfront_sticky), Qt))) |
| 1192 | props = Fcons (Qfront_sticky, Fcons (Fnreverse (front), props)); |
| 1193 | return props; |
| 1194 | } |
| 1195 | |
| 1196 | \f |
| 1197 | /* Delete a node I from its interval tree by merging its subtrees |
| 1198 | into one subtree which is then returned. Caller is responsible for |
| 1199 | storing the resulting subtree into its parent. */ |
| 1200 | |
| 1201 | static INTERVAL |
| 1202 | delete_node (register INTERVAL i) |
| 1203 | { |
| 1204 | register INTERVAL migrate, this; |
| 1205 | register ptrdiff_t migrate_amt; |
| 1206 | |
| 1207 | if (!i->left) |
| 1208 | return i->right; |
| 1209 | if (!i->right) |
| 1210 | return i->left; |
| 1211 | |
| 1212 | migrate = i->left; |
| 1213 | migrate_amt = i->left->total_length; |
| 1214 | this = i->right; |
| 1215 | this->total_length += migrate_amt; |
| 1216 | while (this->left) |
| 1217 | { |
| 1218 | this = this->left; |
| 1219 | this->total_length += migrate_amt; |
| 1220 | } |
| 1221 | eassert (TOTAL_LENGTH (this) >= 0); |
| 1222 | set_interval_left (this, migrate); |
| 1223 | set_interval_parent (migrate, this); |
| 1224 | |
| 1225 | return i->right; |
| 1226 | } |
| 1227 | |
| 1228 | /* Delete interval I from its tree by calling `delete_node' |
| 1229 | and properly connecting the resultant subtree. |
| 1230 | |
| 1231 | I is presumed to be empty; that is, no adjustments are made |
| 1232 | for the length of I. */ |
| 1233 | |
| 1234 | static void |
| 1235 | delete_interval (register INTERVAL i) |
| 1236 | { |
| 1237 | register INTERVAL parent; |
| 1238 | ptrdiff_t amt = LENGTH (i); |
| 1239 | |
| 1240 | eassert (amt == 0); /* Only used on zero-length intervals now. */ |
| 1241 | |
| 1242 | if (ROOT_INTERVAL_P (i)) |
| 1243 | { |
| 1244 | Lisp_Object owner; |
| 1245 | GET_INTERVAL_OBJECT (owner, i); |
| 1246 | parent = delete_node (i); |
| 1247 | if (parent) |
| 1248 | set_interval_object (parent, owner); |
| 1249 | |
| 1250 | if (BUFFERP (owner)) |
| 1251 | set_buffer_intervals (XBUFFER (owner), parent); |
| 1252 | else if (STRINGP (owner)) |
| 1253 | set_string_intervals (owner, parent); |
| 1254 | else |
| 1255 | emacs_abort (); |
| 1256 | |
| 1257 | return; |
| 1258 | } |
| 1259 | |
| 1260 | parent = INTERVAL_PARENT (i); |
| 1261 | if (AM_LEFT_CHILD (i)) |
| 1262 | { |
| 1263 | set_interval_left (parent, delete_node (i)); |
| 1264 | if (parent->left) |
| 1265 | set_interval_parent (parent->left, parent); |
| 1266 | } |
| 1267 | else |
| 1268 | { |
| 1269 | set_interval_right (parent, delete_node (i)); |
| 1270 | if (parent->right) |
| 1271 | set_interval_parent (parent->right, parent); |
| 1272 | } |
| 1273 | } |
| 1274 | \f |
| 1275 | /* Find the interval in TREE corresponding to the relative position |
| 1276 | FROM and delete as much as possible of AMOUNT from that interval. |
| 1277 | Return the amount actually deleted, and if the interval was |
| 1278 | zeroed-out, delete that interval node from the tree. |
| 1279 | |
| 1280 | Note that FROM is actually origin zero, aka relative to the |
| 1281 | leftmost edge of tree. This is appropriate since we call ourselves |
| 1282 | recursively on subtrees. |
| 1283 | |
| 1284 | Do this by recursing down TREE to the interval in question, and |
| 1285 | deleting the appropriate amount of text. */ |
| 1286 | |
| 1287 | static ptrdiff_t |
| 1288 | interval_deletion_adjustment (register INTERVAL tree, register ptrdiff_t from, |
| 1289 | register ptrdiff_t amount) |
| 1290 | { |
| 1291 | register ptrdiff_t relative_position = from; |
| 1292 | |
| 1293 | if (!tree) |
| 1294 | return 0; |
| 1295 | |
| 1296 | /* Left branch. */ |
| 1297 | if (relative_position < LEFT_TOTAL_LENGTH (tree)) |
| 1298 | { |
| 1299 | ptrdiff_t subtract = interval_deletion_adjustment (tree->left, |
| 1300 | relative_position, |
| 1301 | amount); |
| 1302 | tree->total_length -= subtract; |
| 1303 | eassert (TOTAL_LENGTH (tree) >= 0); |
| 1304 | return subtract; |
| 1305 | } |
| 1306 | /* Right branch. */ |
| 1307 | else if (relative_position >= (TOTAL_LENGTH (tree) |
| 1308 | - RIGHT_TOTAL_LENGTH (tree))) |
| 1309 | { |
| 1310 | ptrdiff_t subtract; |
| 1311 | |
| 1312 | relative_position -= (tree->total_length |
| 1313 | - RIGHT_TOTAL_LENGTH (tree)); |
| 1314 | subtract = interval_deletion_adjustment (tree->right, |
| 1315 | relative_position, |
| 1316 | amount); |
| 1317 | tree->total_length -= subtract; |
| 1318 | eassert (TOTAL_LENGTH (tree) >= 0); |
| 1319 | return subtract; |
| 1320 | } |
| 1321 | /* Here -- this node. */ |
| 1322 | else |
| 1323 | { |
| 1324 | /* How much can we delete from this interval? */ |
| 1325 | ptrdiff_t my_amount = ((tree->total_length |
| 1326 | - RIGHT_TOTAL_LENGTH (tree)) |
| 1327 | - relative_position); |
| 1328 | |
| 1329 | if (amount > my_amount) |
| 1330 | amount = my_amount; |
| 1331 | |
| 1332 | tree->total_length -= amount; |
| 1333 | eassert (TOTAL_LENGTH (tree) >= 0); |
| 1334 | if (LENGTH (tree) == 0) |
| 1335 | delete_interval (tree); |
| 1336 | |
| 1337 | return amount; |
| 1338 | } |
| 1339 | |
| 1340 | /* Never reach here. */ |
| 1341 | } |
| 1342 | |
| 1343 | /* Effect the adjustments necessary to the interval tree of BUFFER to |
| 1344 | correspond to the deletion of LENGTH characters from that buffer |
| 1345 | text. The deletion is effected at position START (which is a |
| 1346 | buffer position, i.e. origin 1). */ |
| 1347 | |
| 1348 | static void |
| 1349 | adjust_intervals_for_deletion (struct buffer *buffer, |
| 1350 | ptrdiff_t start, ptrdiff_t length) |
| 1351 | { |
| 1352 | ptrdiff_t left_to_delete = length; |
| 1353 | INTERVAL tree = buffer_intervals (buffer); |
| 1354 | Lisp_Object parent; |
| 1355 | ptrdiff_t offset; |
| 1356 | |
| 1357 | GET_INTERVAL_OBJECT (parent, tree); |
| 1358 | offset = (BUFFERP (parent) ? BUF_BEG (XBUFFER (parent)) : 0); |
| 1359 | |
| 1360 | if (!tree) |
| 1361 | return; |
| 1362 | |
| 1363 | eassert (start <= offset + TOTAL_LENGTH (tree) |
| 1364 | && start + length <= offset + TOTAL_LENGTH (tree)); |
| 1365 | |
| 1366 | if (length == TOTAL_LENGTH (tree)) |
| 1367 | { |
| 1368 | set_buffer_intervals (buffer, NULL); |
| 1369 | return; |
| 1370 | } |
| 1371 | |
| 1372 | if (ONLY_INTERVAL_P (tree)) |
| 1373 | { |
| 1374 | tree->total_length -= length; |
| 1375 | eassert (TOTAL_LENGTH (tree) >= 0); |
| 1376 | return; |
| 1377 | } |
| 1378 | |
| 1379 | if (start > offset + TOTAL_LENGTH (tree)) |
| 1380 | start = offset + TOTAL_LENGTH (tree); |
| 1381 | while (left_to_delete > 0) |
| 1382 | { |
| 1383 | left_to_delete -= interval_deletion_adjustment (tree, start - offset, |
| 1384 | left_to_delete); |
| 1385 | tree = buffer_intervals (buffer); |
| 1386 | if (left_to_delete == tree->total_length) |
| 1387 | { |
| 1388 | set_buffer_intervals (buffer, NULL); |
| 1389 | return; |
| 1390 | } |
| 1391 | } |
| 1392 | } |
| 1393 | \f |
| 1394 | /* Make the adjustments necessary to the interval tree of BUFFER to |
| 1395 | represent an addition or deletion of LENGTH characters starting |
| 1396 | at position START. Addition or deletion is indicated by the sign |
| 1397 | of LENGTH. */ |
| 1398 | |
| 1399 | void |
| 1400 | offset_intervals (struct buffer *buffer, ptrdiff_t start, ptrdiff_t length) |
| 1401 | { |
| 1402 | if (!buffer_intervals (buffer) || length == 0) |
| 1403 | return; |
| 1404 | |
| 1405 | if (length > 0) |
| 1406 | adjust_intervals_for_insertion (buffer_intervals (buffer), |
| 1407 | start, length); |
| 1408 | else |
| 1409 | { |
| 1410 | lint_assume (- TYPE_MAXIMUM (ptrdiff_t) <= length); |
| 1411 | adjust_intervals_for_deletion (buffer, start, -length); |
| 1412 | } |
| 1413 | } |
| 1414 | \f |
| 1415 | /* Merge interval I with its lexicographic successor. The resulting |
| 1416 | interval is returned, and has the properties of the original |
| 1417 | successor. The properties of I are lost. I is removed from the |
| 1418 | interval tree. |
| 1419 | |
| 1420 | IMPORTANT: |
| 1421 | The caller must verify that this is not the last (rightmost) |
| 1422 | interval. */ |
| 1423 | |
| 1424 | static INTERVAL |
| 1425 | merge_interval_right (register INTERVAL i) |
| 1426 | { |
| 1427 | register ptrdiff_t absorb = LENGTH (i); |
| 1428 | register INTERVAL successor; |
| 1429 | |
| 1430 | /* Find the succeeding interval. */ |
| 1431 | if (! NULL_RIGHT_CHILD (i)) /* It's below us. Add absorb |
| 1432 | as we descend. */ |
| 1433 | { |
| 1434 | successor = i->right; |
| 1435 | while (! NULL_LEFT_CHILD (successor)) |
| 1436 | { |
| 1437 | successor->total_length += absorb; |
| 1438 | eassert (TOTAL_LENGTH (successor) >= 0); |
| 1439 | successor = successor->left; |
| 1440 | } |
| 1441 | |
| 1442 | successor->total_length += absorb; |
| 1443 | eassert (TOTAL_LENGTH (successor) >= 0); |
| 1444 | delete_interval (i); |
| 1445 | return successor; |
| 1446 | } |
| 1447 | |
| 1448 | /* Zero out this interval. */ |
| 1449 | i->total_length -= absorb; |
| 1450 | eassert (TOTAL_LENGTH (i) >= 0); |
| 1451 | |
| 1452 | successor = i; |
| 1453 | while (! NULL_PARENT (successor)) /* It's above us. Subtract as |
| 1454 | we ascend. */ |
| 1455 | { |
| 1456 | if (AM_LEFT_CHILD (successor)) |
| 1457 | { |
| 1458 | successor = INTERVAL_PARENT (successor); |
| 1459 | delete_interval (i); |
| 1460 | return successor; |
| 1461 | } |
| 1462 | |
| 1463 | successor = INTERVAL_PARENT (successor); |
| 1464 | successor->total_length -= absorb; |
| 1465 | eassert (TOTAL_LENGTH (successor) >= 0); |
| 1466 | } |
| 1467 | |
| 1468 | /* This must be the rightmost or last interval and cannot |
| 1469 | be merged right. The caller should have known. */ |
| 1470 | emacs_abort (); |
| 1471 | } |
| 1472 | \f |
| 1473 | /* Merge interval I with its lexicographic predecessor. The resulting |
| 1474 | interval is returned, and has the properties of the original predecessor. |
| 1475 | The properties of I are lost. Interval node I is removed from the tree. |
| 1476 | |
| 1477 | IMPORTANT: |
| 1478 | The caller must verify that this is not the first (leftmost) interval. */ |
| 1479 | |
| 1480 | INTERVAL |
| 1481 | merge_interval_left (register INTERVAL i) |
| 1482 | { |
| 1483 | register ptrdiff_t absorb = LENGTH (i); |
| 1484 | register INTERVAL predecessor; |
| 1485 | |
| 1486 | /* Find the preceding interval. */ |
| 1487 | if (! NULL_LEFT_CHILD (i)) /* It's below us. Go down, |
| 1488 | adding ABSORB as we go. */ |
| 1489 | { |
| 1490 | predecessor = i->left; |
| 1491 | while (! NULL_RIGHT_CHILD (predecessor)) |
| 1492 | { |
| 1493 | predecessor->total_length += absorb; |
| 1494 | eassert (TOTAL_LENGTH (predecessor) >= 0); |
| 1495 | predecessor = predecessor->right; |
| 1496 | } |
| 1497 | |
| 1498 | predecessor->total_length += absorb; |
| 1499 | eassert (TOTAL_LENGTH (predecessor) >= 0); |
| 1500 | delete_interval (i); |
| 1501 | return predecessor; |
| 1502 | } |
| 1503 | |
| 1504 | /* Zero out this interval. */ |
| 1505 | i->total_length -= absorb; |
| 1506 | eassert (TOTAL_LENGTH (i) >= 0); |
| 1507 | |
| 1508 | predecessor = i; |
| 1509 | while (! NULL_PARENT (predecessor)) /* It's above us. Go up, |
| 1510 | subtracting ABSORB. */ |
| 1511 | { |
| 1512 | if (AM_RIGHT_CHILD (predecessor)) |
| 1513 | { |
| 1514 | predecessor = INTERVAL_PARENT (predecessor); |
| 1515 | delete_interval (i); |
| 1516 | return predecessor; |
| 1517 | } |
| 1518 | |
| 1519 | predecessor = INTERVAL_PARENT (predecessor); |
| 1520 | predecessor->total_length -= absorb; |
| 1521 | eassert (TOTAL_LENGTH (predecessor) >= 0); |
| 1522 | } |
| 1523 | |
| 1524 | /* This must be the leftmost or first interval and cannot |
| 1525 | be merged left. The caller should have known. */ |
| 1526 | emacs_abort (); |
| 1527 | } |
| 1528 | \f |
| 1529 | /* Create a copy of SOURCE but with the default value of UP. */ |
| 1530 | |
| 1531 | static INTERVAL |
| 1532 | reproduce_interval (INTERVAL source) |
| 1533 | { |
| 1534 | register INTERVAL target = make_interval (); |
| 1535 | |
| 1536 | target->total_length = source->total_length; |
| 1537 | target->position = source->position; |
| 1538 | |
| 1539 | copy_properties (source, target); |
| 1540 | |
| 1541 | if (! NULL_LEFT_CHILD (source)) |
| 1542 | set_interval_left (target, reproduce_tree (source->left, target)); |
| 1543 | if (! NULL_RIGHT_CHILD (source)) |
| 1544 | set_interval_right (target, reproduce_tree (source->right, target)); |
| 1545 | |
| 1546 | return target; |
| 1547 | } |
| 1548 | |
| 1549 | /* Make an exact copy of interval tree SOURCE which descends from |
| 1550 | PARENT. This is done by recursing through SOURCE, copying |
| 1551 | the current interval and its properties, and then adjusting |
| 1552 | the pointers of the copy. */ |
| 1553 | |
| 1554 | static INTERVAL |
| 1555 | reproduce_tree (INTERVAL source, INTERVAL parent) |
| 1556 | { |
| 1557 | INTERVAL target = reproduce_interval (source); |
| 1558 | set_interval_parent (target, parent); |
| 1559 | return target; |
| 1560 | } |
| 1561 | |
| 1562 | static INTERVAL |
| 1563 | reproduce_tree_obj (INTERVAL source, Lisp_Object parent) |
| 1564 | { |
| 1565 | INTERVAL target = reproduce_interval (source); |
| 1566 | set_interval_object (target, parent); |
| 1567 | return target; |
| 1568 | } |
| 1569 | \f |
| 1570 | /* Insert the intervals of SOURCE into BUFFER at POSITION. |
| 1571 | LENGTH is the length of the text in SOURCE. |
| 1572 | |
| 1573 | The `position' field of the SOURCE intervals is assumed to be |
| 1574 | consistent with its parent; therefore, SOURCE must be an |
| 1575 | interval tree made with copy_interval or must be the whole |
| 1576 | tree of a buffer or a string. |
| 1577 | |
| 1578 | This is used in insdel.c when inserting Lisp_Strings into the |
| 1579 | buffer. The text corresponding to SOURCE is already in the buffer |
| 1580 | when this is called. The intervals of new tree are a copy of those |
| 1581 | belonging to the string being inserted; intervals are never |
| 1582 | shared. |
| 1583 | |
| 1584 | If the inserted text had no intervals associated, and we don't |
| 1585 | want to inherit the surrounding text's properties, this function |
| 1586 | simply returns -- offset_intervals should handle placing the |
| 1587 | text in the correct interval, depending on the sticky bits. |
| 1588 | |
| 1589 | If the inserted text had properties (intervals), then there are two |
| 1590 | cases -- either insertion happened in the middle of some interval, |
| 1591 | or between two intervals. |
| 1592 | |
| 1593 | If the text goes into the middle of an interval, then new intervals |
| 1594 | are created in the middle, and new text has the union of its properties |
| 1595 | and those of the text into which it was inserted. |
| 1596 | |
| 1597 | If the text goes between two intervals, then if neither interval |
| 1598 | had its appropriate sticky property set (front_sticky, rear_sticky), |
| 1599 | the new text has only its properties. If one of the sticky properties |
| 1600 | is set, then the new text "sticks" to that region and its properties |
| 1601 | depend on merging as above. If both the preceding and succeeding |
| 1602 | intervals to the new text are "sticky", then the new text retains |
| 1603 | only its properties, as if neither sticky property were set. Perhaps |
| 1604 | we should consider merging all three sets of properties onto the new |
| 1605 | text... */ |
| 1606 | |
| 1607 | void |
| 1608 | graft_intervals_into_buffer (INTERVAL source, ptrdiff_t position, |
| 1609 | ptrdiff_t length, struct buffer *buffer, |
| 1610 | bool inherit) |
| 1611 | { |
| 1612 | INTERVAL tree = buffer_intervals (buffer); |
| 1613 | INTERVAL under, over, this; |
| 1614 | ptrdiff_t over_used; |
| 1615 | |
| 1616 | /* If the new text has no properties, then with inheritance it |
| 1617 | becomes part of whatever interval it was inserted into. |
| 1618 | To prevent inheritance, we must clear out the properties |
| 1619 | of the newly inserted text. */ |
| 1620 | if (!source) |
| 1621 | { |
| 1622 | Lisp_Object buf; |
| 1623 | if (!inherit && tree && length > 0) |
| 1624 | { |
| 1625 | XSETBUFFER (buf, buffer); |
| 1626 | set_text_properties_1 (make_number (position), |
| 1627 | make_number (position + length), |
| 1628 | Qnil, buf, |
| 1629 | find_interval (tree, position)); |
| 1630 | } |
| 1631 | /* Shouldn't be necessary. --Stef */ |
| 1632 | buffer_balance_intervals (buffer); |
| 1633 | return; |
| 1634 | } |
| 1635 | |
| 1636 | eassert (length == TOTAL_LENGTH (source)); |
| 1637 | |
| 1638 | if ((BUF_Z (buffer) - BUF_BEG (buffer)) == length) |
| 1639 | { |
| 1640 | /* The inserted text constitutes the whole buffer, so |
| 1641 | simply copy over the interval structure. */ |
| 1642 | Lisp_Object buf; |
| 1643 | |
| 1644 | XSETBUFFER (buf, buffer); |
| 1645 | set_buffer_intervals (buffer, reproduce_tree_obj (source, buf)); |
| 1646 | buffer_intervals (buffer)->position = BUF_BEG (buffer); |
| 1647 | eassert (buffer_intervals (buffer)->up_obj == 1); |
| 1648 | return; |
| 1649 | } |
| 1650 | else if (!tree) |
| 1651 | { |
| 1652 | /* Create an interval tree in which to place a copy |
| 1653 | of the intervals of the inserted string. */ |
| 1654 | Lisp_Object buf; |
| 1655 | |
| 1656 | XSETBUFFER (buf, buffer); |
| 1657 | tree = create_root_interval (buf); |
| 1658 | } |
| 1659 | /* Paranoia -- the text has already been added, so |
| 1660 | this buffer should be of non-zero length. */ |
| 1661 | eassert (TOTAL_LENGTH (tree) > 0); |
| 1662 | |
| 1663 | this = under = find_interval (tree, position); |
| 1664 | eassert (under); |
| 1665 | over = find_interval (source, interval_start_pos (source)); |
| 1666 | |
| 1667 | /* Here for insertion in the middle of an interval. |
| 1668 | Split off an equivalent interval to the right, |
| 1669 | then don't bother with it any more. */ |
| 1670 | |
| 1671 | if (position > under->position) |
| 1672 | { |
| 1673 | INTERVAL end_unchanged |
| 1674 | = split_interval_left (this, position - under->position); |
| 1675 | copy_properties (under, end_unchanged); |
| 1676 | under->position = position; |
| 1677 | } |
| 1678 | else |
| 1679 | { |
| 1680 | /* This call may have some effect because previous_interval may |
| 1681 | update `position' fields of intervals. Thus, don't ignore it |
| 1682 | for the moment. Someone please tell me the truth (K.Handa). */ |
| 1683 | INTERVAL prev = previous_interval (under); |
| 1684 | (void) prev; |
| 1685 | #if 0 |
| 1686 | /* But, this code surely has no effect. And, anyway, |
| 1687 | END_NONSTICKY_P is unreliable now. */ |
| 1688 | if (prev && !END_NONSTICKY_P (prev)) |
| 1689 | prev = 0; |
| 1690 | #endif /* 0 */ |
| 1691 | } |
| 1692 | |
| 1693 | /* Insertion is now at beginning of UNDER. */ |
| 1694 | |
| 1695 | /* The inserted text "sticks" to the interval `under', |
| 1696 | which means it gets those properties. |
| 1697 | The properties of under are the result of |
| 1698 | adjust_intervals_for_insertion, so stickiness has |
| 1699 | already been taken care of. */ |
| 1700 | |
| 1701 | /* OVER is the interval we are copying from next. |
| 1702 | OVER_USED says how many characters' worth of OVER |
| 1703 | have already been copied into target intervals. |
| 1704 | UNDER is the next interval in the target. */ |
| 1705 | over_used = 0; |
| 1706 | while (over) |
| 1707 | { |
| 1708 | /* If UNDER is longer than OVER, split it. */ |
| 1709 | if (LENGTH (over) - over_used < LENGTH (under)) |
| 1710 | { |
| 1711 | this = split_interval_left (under, LENGTH (over) - over_used); |
| 1712 | copy_properties (under, this); |
| 1713 | } |
| 1714 | else |
| 1715 | this = under; |
| 1716 | |
| 1717 | /* THIS is now the interval to copy or merge into. |
| 1718 | OVER covers all of it. */ |
| 1719 | if (inherit) |
| 1720 | merge_properties (over, this); |
| 1721 | else |
| 1722 | copy_properties (over, this); |
| 1723 | |
| 1724 | /* If THIS and OVER end at the same place, |
| 1725 | advance OVER to a new source interval. */ |
| 1726 | if (LENGTH (this) == LENGTH (over) - over_used) |
| 1727 | { |
| 1728 | over = next_interval (over); |
| 1729 | over_used = 0; |
| 1730 | } |
| 1731 | else |
| 1732 | /* Otherwise just record that more of OVER has been used. */ |
| 1733 | over_used += LENGTH (this); |
| 1734 | |
| 1735 | /* Always advance to a new target interval. */ |
| 1736 | under = next_interval (this); |
| 1737 | } |
| 1738 | |
| 1739 | buffer_balance_intervals (buffer); |
| 1740 | } |
| 1741 | |
| 1742 | /* Get the value of property PROP from PLIST, |
| 1743 | which is the plist of an interval. |
| 1744 | We check for direct properties, for categories with property PROP, |
| 1745 | and for PROP appearing on the default-text-properties list. */ |
| 1746 | |
| 1747 | Lisp_Object |
| 1748 | textget (Lisp_Object plist, register Lisp_Object prop) |
| 1749 | { |
| 1750 | return lookup_char_property (plist, prop, 1); |
| 1751 | } |
| 1752 | |
| 1753 | Lisp_Object |
| 1754 | lookup_char_property (Lisp_Object plist, Lisp_Object prop, bool textprop) |
| 1755 | { |
| 1756 | Lisp_Object tail, fallback = Qnil; |
| 1757 | |
| 1758 | for (tail = plist; CONSP (tail); tail = Fcdr (XCDR (tail))) |
| 1759 | { |
| 1760 | register Lisp_Object tem; |
| 1761 | tem = XCAR (tail); |
| 1762 | if (EQ (prop, tem)) |
| 1763 | return Fcar (XCDR (tail)); |
| 1764 | if (EQ (tem, Qcategory)) |
| 1765 | { |
| 1766 | tem = Fcar (XCDR (tail)); |
| 1767 | if (SYMBOLP (tem)) |
| 1768 | fallback = Fget (tem, prop); |
| 1769 | } |
| 1770 | } |
| 1771 | |
| 1772 | if (! NILP (fallback)) |
| 1773 | return fallback; |
| 1774 | /* Check for alternative properties */ |
| 1775 | tail = Fassq (prop, Vchar_property_alias_alist); |
| 1776 | if (! NILP (tail)) |
| 1777 | { |
| 1778 | tail = XCDR (tail); |
| 1779 | for (; NILP (fallback) && CONSP (tail); tail = XCDR (tail)) |
| 1780 | fallback = Fplist_get (plist, XCAR (tail)); |
| 1781 | } |
| 1782 | |
| 1783 | if (textprop && NILP (fallback) && CONSP (Vdefault_text_properties)) |
| 1784 | fallback = Fplist_get (Vdefault_text_properties, prop); |
| 1785 | return fallback; |
| 1786 | } |
| 1787 | |
| 1788 | \f |
| 1789 | /* Set point in BUFFER "temporarily" to CHARPOS, which corresponds to |
| 1790 | byte position BYTEPOS. */ |
| 1791 | |
| 1792 | void |
| 1793 | temp_set_point_both (struct buffer *buffer, |
| 1794 | ptrdiff_t charpos, ptrdiff_t bytepos) |
| 1795 | { |
| 1796 | /* In a single-byte buffer, the two positions must be equal. */ |
| 1797 | if (BUF_ZV (buffer) == BUF_ZV_BYTE (buffer)) |
| 1798 | eassert (charpos == bytepos); |
| 1799 | |
| 1800 | eassert (charpos <= bytepos); |
| 1801 | eassert (charpos <= BUF_ZV (buffer) || BUF_BEGV (buffer) <= charpos); |
| 1802 | |
| 1803 | SET_BUF_PT_BOTH (buffer, charpos, bytepos); |
| 1804 | } |
| 1805 | |
| 1806 | /* Set point "temporarily", without checking any text properties. */ |
| 1807 | |
| 1808 | void |
| 1809 | temp_set_point (struct buffer *buffer, ptrdiff_t charpos) |
| 1810 | { |
| 1811 | temp_set_point_both (buffer, charpos, |
| 1812 | buf_charpos_to_bytepos (buffer, charpos)); |
| 1813 | } |
| 1814 | |
| 1815 | /* Set point in BUFFER to CHARPOS. If the target position is |
| 1816 | before an intangible character, move to an ok place. */ |
| 1817 | |
| 1818 | void |
| 1819 | set_point (ptrdiff_t charpos) |
| 1820 | { |
| 1821 | set_point_both (charpos, buf_charpos_to_bytepos (current_buffer, charpos)); |
| 1822 | } |
| 1823 | |
| 1824 | /* If there's an invisible character at position POS + TEST_OFFS in the |
| 1825 | current buffer, and the invisible property has a `stickiness' such that |
| 1826 | inserting a character at position POS would inherit the property it, |
| 1827 | return POS + ADJ, otherwise return POS. If TEST_INTANG, intangibility |
| 1828 | is required as well as invisibility. |
| 1829 | |
| 1830 | TEST_OFFS should be either 0 or -1, and ADJ should be either 1 or -1. |
| 1831 | |
| 1832 | Note that `stickiness' is determined by overlay marker insertion types, |
| 1833 | if the invisible property comes from an overlay. */ |
| 1834 | |
| 1835 | static ptrdiff_t |
| 1836 | adjust_for_invis_intang (ptrdiff_t pos, ptrdiff_t test_offs, ptrdiff_t adj, |
| 1837 | bool test_intang) |
| 1838 | { |
| 1839 | Lisp_Object invis_propval, invis_overlay; |
| 1840 | Lisp_Object test_pos; |
| 1841 | |
| 1842 | if ((adj < 0 && pos + adj < BEGV) || (adj > 0 && pos + adj > ZV)) |
| 1843 | /* POS + ADJ would be beyond the buffer bounds, so do no adjustment. */ |
| 1844 | return pos; |
| 1845 | |
| 1846 | test_pos = make_number (pos + test_offs); |
| 1847 | |
| 1848 | invis_propval |
| 1849 | = get_char_property_and_overlay (test_pos, Qinvisible, Qnil, |
| 1850 | &invis_overlay); |
| 1851 | |
| 1852 | if ((!test_intang |
| 1853 | || ! NILP (Fget_char_property (test_pos, Qintangible, Qnil))) |
| 1854 | && TEXT_PROP_MEANS_INVISIBLE (invis_propval) |
| 1855 | /* This next test is true if the invisible property has a stickiness |
| 1856 | such that an insertion at POS would inherit it. */ |
| 1857 | && (NILP (invis_overlay) |
| 1858 | /* Invisible property is from a text-property. */ |
| 1859 | ? (text_property_stickiness (Qinvisible, make_number (pos), Qnil) |
| 1860 | == (test_offs == 0 ? 1 : -1)) |
| 1861 | /* Invisible property is from an overlay. */ |
| 1862 | : (test_offs == 0 |
| 1863 | ? XMARKER (OVERLAY_START (invis_overlay))->insertion_type == 0 |
| 1864 | : XMARKER (OVERLAY_END (invis_overlay))->insertion_type == 1))) |
| 1865 | pos += adj; |
| 1866 | |
| 1867 | return pos; |
| 1868 | } |
| 1869 | |
| 1870 | /* Set point in BUFFER to CHARPOS, which corresponds to byte |
| 1871 | position BYTEPOS. If the target position is |
| 1872 | before an intangible character, move to an ok place. */ |
| 1873 | |
| 1874 | void |
| 1875 | set_point_both (ptrdiff_t charpos, ptrdiff_t bytepos) |
| 1876 | { |
| 1877 | register INTERVAL to, from, toprev, fromprev; |
| 1878 | ptrdiff_t buffer_point; |
| 1879 | ptrdiff_t old_position = PT; |
| 1880 | /* This ensures that we move forward past intangible text when the |
| 1881 | initial position is the same as the destination, in the rare |
| 1882 | instances where this is important, e.g. in line-move-finish |
| 1883 | (simple.el). */ |
| 1884 | bool backwards = charpos < old_position; |
| 1885 | bool have_overlays; |
| 1886 | ptrdiff_t original_position; |
| 1887 | |
| 1888 | bset_point_before_scroll (current_buffer, Qnil); |
| 1889 | |
| 1890 | if (charpos == PT) |
| 1891 | return; |
| 1892 | |
| 1893 | /* In a single-byte buffer, the two positions must be equal. */ |
| 1894 | eassert (ZV != ZV_BYTE || charpos == bytepos); |
| 1895 | |
| 1896 | /* Check this now, before checking if the buffer has any intervals. |
| 1897 | That way, we can catch conditions which break this sanity check |
| 1898 | whether or not there are intervals in the buffer. */ |
| 1899 | eassert (charpos <= ZV && charpos >= BEGV); |
| 1900 | |
| 1901 | have_overlays = buffer_has_overlays (); |
| 1902 | |
| 1903 | /* If we have no text properties and overlays, |
| 1904 | then we can do it quickly. */ |
| 1905 | if (!buffer_intervals (current_buffer) && ! have_overlays) |
| 1906 | { |
| 1907 | temp_set_point_both (current_buffer, charpos, bytepos); |
| 1908 | return; |
| 1909 | } |
| 1910 | |
| 1911 | /* Set TO to the interval containing the char after CHARPOS, |
| 1912 | and TOPREV to the interval containing the char before CHARPOS. |
| 1913 | Either one may be null. They may be equal. */ |
| 1914 | to = find_interval (buffer_intervals (current_buffer), charpos); |
| 1915 | if (charpos == BEGV) |
| 1916 | toprev = 0; |
| 1917 | else if (to && to->position == charpos) |
| 1918 | toprev = previous_interval (to); |
| 1919 | else |
| 1920 | toprev = to; |
| 1921 | |
| 1922 | buffer_point = (PT == ZV ? ZV - 1 : PT); |
| 1923 | |
| 1924 | /* Set FROM to the interval containing the char after PT, |
| 1925 | and FROMPREV to the interval containing the char before PT. |
| 1926 | Either one may be null. They may be equal. */ |
| 1927 | /* We could cache this and save time. */ |
| 1928 | from = find_interval (buffer_intervals (current_buffer), buffer_point); |
| 1929 | if (buffer_point == BEGV) |
| 1930 | fromprev = 0; |
| 1931 | else if (from && from->position == PT) |
| 1932 | fromprev = previous_interval (from); |
| 1933 | else if (buffer_point != PT) |
| 1934 | fromprev = from, from = 0; |
| 1935 | else |
| 1936 | fromprev = from; |
| 1937 | |
| 1938 | /* Moving within an interval. */ |
| 1939 | if (to == from && toprev == fromprev && INTERVAL_VISIBLE_P (to) |
| 1940 | && ! have_overlays) |
| 1941 | { |
| 1942 | temp_set_point_both (current_buffer, charpos, bytepos); |
| 1943 | return; |
| 1944 | } |
| 1945 | |
| 1946 | original_position = charpos; |
| 1947 | |
| 1948 | /* If the new position is between two intangible characters |
| 1949 | with the same intangible property value, |
| 1950 | move forward or backward until a change in that property. */ |
| 1951 | if (NILP (Vinhibit_point_motion_hooks) |
| 1952 | && ((to && toprev) |
| 1953 | || have_overlays) |
| 1954 | /* Intangibility never stops us from positioning at the beginning |
| 1955 | or end of the buffer, so don't bother checking in that case. */ |
| 1956 | && charpos != BEGV && charpos != ZV) |
| 1957 | { |
| 1958 | Lisp_Object pos; |
| 1959 | Lisp_Object intangible_propval; |
| 1960 | |
| 1961 | if (backwards) |
| 1962 | { |
| 1963 | /* If the preceding character is both intangible and invisible, |
| 1964 | and the invisible property is `rear-sticky', perturb it so |
| 1965 | that the search starts one character earlier -- this ensures |
| 1966 | that point can never move to the end of an invisible/ |
| 1967 | intangible/rear-sticky region. */ |
| 1968 | charpos = adjust_for_invis_intang (charpos, -1, -1, 1); |
| 1969 | |
| 1970 | XSETINT (pos, charpos); |
| 1971 | |
| 1972 | /* If following char is intangible, |
| 1973 | skip back over all chars with matching intangible property. */ |
| 1974 | |
| 1975 | intangible_propval = Fget_char_property (pos, Qintangible, Qnil); |
| 1976 | |
| 1977 | if (! NILP (intangible_propval)) |
| 1978 | { |
| 1979 | while (XINT (pos) > BEGV |
| 1980 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), |
| 1981 | Qintangible, Qnil), |
| 1982 | intangible_propval)) |
| 1983 | pos = Fprevious_char_property_change (pos, Qnil); |
| 1984 | |
| 1985 | /* Set CHARPOS from POS, and if the final intangible character |
| 1986 | that we skipped over is also invisible, and the invisible |
| 1987 | property is `front-sticky', perturb it to be one character |
| 1988 | earlier -- this ensures that point can never move to the |
| 1989 | beginning of an invisible/intangible/front-sticky region. */ |
| 1990 | charpos = adjust_for_invis_intang (XINT (pos), 0, -1, 0); |
| 1991 | } |
| 1992 | } |
| 1993 | else |
| 1994 | { |
| 1995 | /* If the following character is both intangible and invisible, |
| 1996 | and the invisible property is `front-sticky', perturb it so |
| 1997 | that the search starts one character later -- this ensures |
| 1998 | that point can never move to the beginning of an |
| 1999 | invisible/intangible/front-sticky region. */ |
| 2000 | charpos = adjust_for_invis_intang (charpos, 0, 1, 1); |
| 2001 | |
| 2002 | XSETINT (pos, charpos); |
| 2003 | |
| 2004 | /* If preceding char is intangible, |
| 2005 | skip forward over all chars with matching intangible property. */ |
| 2006 | |
| 2007 | intangible_propval = Fget_char_property (make_number (charpos - 1), |
| 2008 | Qintangible, Qnil); |
| 2009 | |
| 2010 | if (! NILP (intangible_propval)) |
| 2011 | { |
| 2012 | while (XINT (pos) < ZV |
| 2013 | && EQ (Fget_char_property (pos, Qintangible, Qnil), |
| 2014 | intangible_propval)) |
| 2015 | pos = Fnext_char_property_change (pos, Qnil); |
| 2016 | |
| 2017 | /* Set CHARPOS from POS, and if the final intangible character |
| 2018 | that we skipped over is also invisible, and the invisible |
| 2019 | property is `rear-sticky', perturb it to be one character |
| 2020 | later -- this ensures that point can never move to the |
| 2021 | end of an invisible/intangible/rear-sticky region. */ |
| 2022 | charpos = adjust_for_invis_intang (XINT (pos), -1, 1, 0); |
| 2023 | } |
| 2024 | } |
| 2025 | |
| 2026 | bytepos = buf_charpos_to_bytepos (current_buffer, charpos); |
| 2027 | } |
| 2028 | |
| 2029 | if (charpos != original_position) |
| 2030 | { |
| 2031 | /* Set TO to the interval containing the char after CHARPOS, |
| 2032 | and TOPREV to the interval containing the char before CHARPOS. |
| 2033 | Either one may be null. They may be equal. */ |
| 2034 | to = find_interval (buffer_intervals (current_buffer), charpos); |
| 2035 | if (charpos == BEGV) |
| 2036 | toprev = 0; |
| 2037 | else if (to && to->position == charpos) |
| 2038 | toprev = previous_interval (to); |
| 2039 | else |
| 2040 | toprev = to; |
| 2041 | } |
| 2042 | |
| 2043 | /* Here TO is the interval after the stopping point |
| 2044 | and TOPREV is the interval before the stopping point. |
| 2045 | One or the other may be null. */ |
| 2046 | |
| 2047 | temp_set_point_both (current_buffer, charpos, bytepos); |
| 2048 | |
| 2049 | /* We run point-left and point-entered hooks here, if the |
| 2050 | two intervals are not equivalent. These hooks take |
| 2051 | (old_point, new_point) as arguments. */ |
| 2052 | if (NILP (Vinhibit_point_motion_hooks) |
| 2053 | && (! intervals_equal (from, to) |
| 2054 | || ! intervals_equal (fromprev, toprev))) |
| 2055 | { |
| 2056 | Lisp_Object leave_after, leave_before, enter_after, enter_before; |
| 2057 | |
| 2058 | if (fromprev) |
| 2059 | leave_before = textget (fromprev->plist, Qpoint_left); |
| 2060 | else |
| 2061 | leave_before = Qnil; |
| 2062 | |
| 2063 | if (from) |
| 2064 | leave_after = textget (from->plist, Qpoint_left); |
| 2065 | else |
| 2066 | leave_after = Qnil; |
| 2067 | |
| 2068 | if (toprev) |
| 2069 | enter_before = textget (toprev->plist, Qpoint_entered); |
| 2070 | else |
| 2071 | enter_before = Qnil; |
| 2072 | |
| 2073 | if (to) |
| 2074 | enter_after = textget (to->plist, Qpoint_entered); |
| 2075 | else |
| 2076 | enter_after = Qnil; |
| 2077 | |
| 2078 | if (! EQ (leave_before, enter_before) && !NILP (leave_before)) |
| 2079 | call2 (leave_before, make_number (old_position), |
| 2080 | make_number (charpos)); |
| 2081 | if (! EQ (leave_after, enter_after) && !NILP (leave_after)) |
| 2082 | call2 (leave_after, make_number (old_position), |
| 2083 | make_number (charpos)); |
| 2084 | |
| 2085 | if (! EQ (enter_before, leave_before) && !NILP (enter_before)) |
| 2086 | call2 (enter_before, make_number (old_position), |
| 2087 | make_number (charpos)); |
| 2088 | if (! EQ (enter_after, leave_after) && !NILP (enter_after)) |
| 2089 | call2 (enter_after, make_number (old_position), |
| 2090 | make_number (charpos)); |
| 2091 | } |
| 2092 | } |
| 2093 | \f |
| 2094 | /* Move point to POSITION, unless POSITION is inside an intangible |
| 2095 | segment that reaches all the way to point. */ |
| 2096 | |
| 2097 | void |
| 2098 | move_if_not_intangible (ptrdiff_t position) |
| 2099 | { |
| 2100 | Lisp_Object pos; |
| 2101 | Lisp_Object intangible_propval; |
| 2102 | |
| 2103 | XSETINT (pos, position); |
| 2104 | |
| 2105 | if (! NILP (Vinhibit_point_motion_hooks)) |
| 2106 | /* If intangible is inhibited, always move point to POSITION. */ |
| 2107 | ; |
| 2108 | else if (PT < position && XINT (pos) < ZV) |
| 2109 | { |
| 2110 | /* We want to move forward, so check the text before POSITION. */ |
| 2111 | |
| 2112 | intangible_propval = Fget_char_property (pos, |
| 2113 | Qintangible, Qnil); |
| 2114 | |
| 2115 | /* If following char is intangible, |
| 2116 | skip back over all chars with matching intangible property. */ |
| 2117 | if (! NILP (intangible_propval)) |
| 2118 | while (XINT (pos) > BEGV |
| 2119 | && EQ (Fget_char_property (make_number (XINT (pos) - 1), |
| 2120 | Qintangible, Qnil), |
| 2121 | intangible_propval)) |
| 2122 | pos = Fprevious_char_property_change (pos, Qnil); |
| 2123 | } |
| 2124 | else if (XINT (pos) > BEGV) |
| 2125 | { |
| 2126 | /* We want to move backward, so check the text after POSITION. */ |
| 2127 | |
| 2128 | intangible_propval = Fget_char_property (make_number (XINT (pos) - 1), |
| 2129 | Qintangible, Qnil); |
| 2130 | |
| 2131 | /* If following char is intangible, |
| 2132 | skip forward over all chars with matching intangible property. */ |
| 2133 | if (! NILP (intangible_propval)) |
| 2134 | while (XINT (pos) < ZV |
| 2135 | && EQ (Fget_char_property (pos, Qintangible, Qnil), |
| 2136 | intangible_propval)) |
| 2137 | pos = Fnext_char_property_change (pos, Qnil); |
| 2138 | |
| 2139 | } |
| 2140 | else if (position < BEGV) |
| 2141 | position = BEGV; |
| 2142 | else if (position > ZV) |
| 2143 | position = ZV; |
| 2144 | |
| 2145 | /* If the whole stretch between PT and POSITION isn't intangible, |
| 2146 | try moving to POSITION (which means we actually move farther |
| 2147 | if POSITION is inside of intangible text). */ |
| 2148 | |
| 2149 | if (XINT (pos) != PT) |
| 2150 | SET_PT (position); |
| 2151 | } |
| 2152 | \f |
| 2153 | /* If text at position POS has property PROP, set *VAL to the property |
| 2154 | value, *START and *END to the beginning and end of a region that |
| 2155 | has the same property, and return true. Otherwise return false. |
| 2156 | |
| 2157 | OBJECT is the string or buffer to look for the property in; |
| 2158 | nil means the current buffer. */ |
| 2159 | |
| 2160 | bool |
| 2161 | get_property_and_range (ptrdiff_t pos, Lisp_Object prop, Lisp_Object *val, |
| 2162 | ptrdiff_t *start, ptrdiff_t *end, Lisp_Object object) |
| 2163 | { |
| 2164 | INTERVAL i, prev, next; |
| 2165 | |
| 2166 | if (NILP (object)) |
| 2167 | i = find_interval (buffer_intervals (current_buffer), pos); |
| 2168 | else if (BUFFERP (object)) |
| 2169 | i = find_interval (buffer_intervals (XBUFFER (object)), pos); |
| 2170 | else if (STRINGP (object)) |
| 2171 | i = find_interval (string_intervals (object), pos); |
| 2172 | else |
| 2173 | emacs_abort (); |
| 2174 | |
| 2175 | if (!i || (i->position + LENGTH (i) <= pos)) |
| 2176 | return 0; |
| 2177 | *val = textget (i->plist, prop); |
| 2178 | if (NILP (*val)) |
| 2179 | return 0; |
| 2180 | |
| 2181 | next = i; /* remember it in advance */ |
| 2182 | prev = previous_interval (i); |
| 2183 | while (prev |
| 2184 | && EQ (*val, textget (prev->plist, prop))) |
| 2185 | i = prev, prev = previous_interval (prev); |
| 2186 | *start = i->position; |
| 2187 | |
| 2188 | next = next_interval (i); |
| 2189 | while (next && EQ (*val, textget (next->plist, prop))) |
| 2190 | i = next, next = next_interval (next); |
| 2191 | *end = i->position + LENGTH (i); |
| 2192 | |
| 2193 | return 1; |
| 2194 | } |
| 2195 | \f |
| 2196 | /* Return the proper local keymap TYPE for position POSITION in |
| 2197 | BUFFER; TYPE should be one of `keymap' or `local-map'. Use the map |
| 2198 | specified by the PROP property, if any. Otherwise, if TYPE is |
| 2199 | `local-map' use BUFFER's local map. |
| 2200 | |
| 2201 | POSITION must be in the accessible part of BUFFER. */ |
| 2202 | |
| 2203 | Lisp_Object |
| 2204 | get_local_map (register ptrdiff_t position, register struct buffer *buffer, |
| 2205 | Lisp_Object type) |
| 2206 | { |
| 2207 | Lisp_Object prop, lispy_position, lispy_buffer; |
| 2208 | ptrdiff_t old_begv, old_zv, old_begv_byte, old_zv_byte; |
| 2209 | |
| 2210 | /* Perhaps we should just change `position' to the limit. */ |
| 2211 | if (position > BUF_ZV (buffer) || position < BUF_BEGV (buffer)) |
| 2212 | emacs_abort (); |
| 2213 | |
| 2214 | /* Ignore narrowing, so that a local map continues to be valid even if |
| 2215 | the visible region contains no characters and hence no properties. */ |
| 2216 | old_begv = BUF_BEGV (buffer); |
| 2217 | old_zv = BUF_ZV (buffer); |
| 2218 | old_begv_byte = BUF_BEGV_BYTE (buffer); |
| 2219 | old_zv_byte = BUF_ZV_BYTE (buffer); |
| 2220 | |
| 2221 | SET_BUF_BEGV_BOTH (buffer, BUF_BEG (buffer), BUF_BEG_BYTE (buffer)); |
| 2222 | SET_BUF_ZV_BOTH (buffer, BUF_Z (buffer), BUF_Z_BYTE (buffer)); |
| 2223 | |
| 2224 | XSETFASTINT (lispy_position, position); |
| 2225 | XSETBUFFER (lispy_buffer, buffer); |
| 2226 | /* First check if the CHAR has any property. This is because when |
| 2227 | we click with the mouse, the mouse pointer is really pointing |
| 2228 | to the CHAR after POS. */ |
| 2229 | prop = Fget_char_property (lispy_position, type, lispy_buffer); |
| 2230 | /* If not, look at the POS's properties. This is necessary because when |
| 2231 | editing a field with a `local-map' property, we want insertion at the end |
| 2232 | to obey the `local-map' property. */ |
| 2233 | if (NILP (prop)) |
| 2234 | prop = get_pos_property (lispy_position, type, lispy_buffer); |
| 2235 | |
| 2236 | SET_BUF_BEGV_BOTH (buffer, old_begv, old_begv_byte); |
| 2237 | SET_BUF_ZV_BOTH (buffer, old_zv, old_zv_byte); |
| 2238 | |
| 2239 | /* Use the local map only if it is valid. */ |
| 2240 | prop = get_keymap (prop, 0, 0); |
| 2241 | if (CONSP (prop)) |
| 2242 | return prop; |
| 2243 | |
| 2244 | if (EQ (type, Qkeymap)) |
| 2245 | return Qnil; |
| 2246 | else |
| 2247 | return BVAR (buffer, keymap); |
| 2248 | } |
| 2249 | \f |
| 2250 | /* Produce an interval tree reflecting the intervals in |
| 2251 | TREE from START to START + LENGTH. |
| 2252 | The new interval tree has no parent and has a starting-position of 0. */ |
| 2253 | |
| 2254 | INTERVAL |
| 2255 | copy_intervals (INTERVAL tree, ptrdiff_t start, ptrdiff_t length) |
| 2256 | { |
| 2257 | register INTERVAL i, new, t; |
| 2258 | register ptrdiff_t got, prevlen; |
| 2259 | |
| 2260 | if (!tree || length <= 0) |
| 2261 | return NULL; |
| 2262 | |
| 2263 | i = find_interval (tree, start); |
| 2264 | eassert (i && LENGTH (i) > 0); |
| 2265 | |
| 2266 | /* If there is only one interval and it's the default, return nil. */ |
| 2267 | if ((start - i->position + 1 + length) < LENGTH (i) |
| 2268 | && DEFAULT_INTERVAL_P (i)) |
| 2269 | return NULL; |
| 2270 | |
| 2271 | new = make_interval (); |
| 2272 | new->position = 0; |
| 2273 | got = (LENGTH (i) - (start - i->position)); |
| 2274 | new->total_length = length; |
| 2275 | eassert (TOTAL_LENGTH (new) >= 0); |
| 2276 | copy_properties (i, new); |
| 2277 | |
| 2278 | t = new; |
| 2279 | prevlen = got; |
| 2280 | while (got < length) |
| 2281 | { |
| 2282 | i = next_interval (i); |
| 2283 | t = split_interval_right (t, prevlen); |
| 2284 | copy_properties (i, t); |
| 2285 | prevlen = LENGTH (i); |
| 2286 | got += prevlen; |
| 2287 | } |
| 2288 | |
| 2289 | return balance_an_interval (new); |
| 2290 | } |
| 2291 | |
| 2292 | /* Give STRING the properties of BUFFER from POSITION to LENGTH. */ |
| 2293 | |
| 2294 | void |
| 2295 | copy_intervals_to_string (Lisp_Object string, struct buffer *buffer, |
| 2296 | ptrdiff_t position, ptrdiff_t length) |
| 2297 | { |
| 2298 | INTERVAL interval_copy = copy_intervals (buffer_intervals (buffer), |
| 2299 | position, length); |
| 2300 | if (!interval_copy) |
| 2301 | return; |
| 2302 | |
| 2303 | set_interval_object (interval_copy, string); |
| 2304 | set_string_intervals (string, interval_copy); |
| 2305 | } |
| 2306 | \f |
| 2307 | /* Return true if strings S1 and S2 have identical properties. |
| 2308 | Assume they have identical characters. */ |
| 2309 | |
| 2310 | bool |
| 2311 | compare_string_intervals (Lisp_Object s1, Lisp_Object s2) |
| 2312 | { |
| 2313 | INTERVAL i1, i2; |
| 2314 | ptrdiff_t pos = 0; |
| 2315 | ptrdiff_t end = SCHARS (s1); |
| 2316 | |
| 2317 | i1 = find_interval (string_intervals (s1), 0); |
| 2318 | i2 = find_interval (string_intervals (s2), 0); |
| 2319 | |
| 2320 | while (pos < end) |
| 2321 | { |
| 2322 | /* Determine how far we can go before we reach the end of I1 or I2. */ |
| 2323 | ptrdiff_t len1 = (i1 != 0 ? INTERVAL_LAST_POS (i1) : end) - pos; |
| 2324 | ptrdiff_t len2 = (i2 != 0 ? INTERVAL_LAST_POS (i2) : end) - pos; |
| 2325 | ptrdiff_t distance = min (len1, len2); |
| 2326 | |
| 2327 | /* If we ever find a mismatch between the strings, |
| 2328 | they differ. */ |
| 2329 | if (! intervals_equal (i1, i2)) |
| 2330 | return 0; |
| 2331 | |
| 2332 | /* Advance POS till the end of the shorter interval, |
| 2333 | and advance one or both interval pointers for the new position. */ |
| 2334 | pos += distance; |
| 2335 | if (len1 == distance) |
| 2336 | i1 = next_interval (i1); |
| 2337 | if (len2 == distance) |
| 2338 | i2 = next_interval (i2); |
| 2339 | } |
| 2340 | return 1; |
| 2341 | } |
| 2342 | \f |
| 2343 | /* Recursively adjust interval I in the current buffer |
| 2344 | for setting enable_multibyte_characters to MULTI_FLAG. |
| 2345 | The range of interval I is START ... END in characters, |
| 2346 | START_BYTE ... END_BYTE in bytes. */ |
| 2347 | |
| 2348 | static void |
| 2349 | set_intervals_multibyte_1 (INTERVAL i, bool multi_flag, |
| 2350 | ptrdiff_t start, ptrdiff_t start_byte, |
| 2351 | ptrdiff_t end, ptrdiff_t end_byte) |
| 2352 | { |
| 2353 | /* Fix the length of this interval. */ |
| 2354 | if (multi_flag) |
| 2355 | i->total_length = end - start; |
| 2356 | else |
| 2357 | i->total_length = end_byte - start_byte; |
| 2358 | eassert (TOTAL_LENGTH (i) >= 0); |
| 2359 | |
| 2360 | if (TOTAL_LENGTH (i) == 0) |
| 2361 | { |
| 2362 | delete_interval (i); |
| 2363 | return; |
| 2364 | } |
| 2365 | |
| 2366 | /* Recursively fix the length of the subintervals. */ |
| 2367 | if (i->left) |
| 2368 | { |
| 2369 | ptrdiff_t left_end, left_end_byte; |
| 2370 | |
| 2371 | if (multi_flag) |
| 2372 | { |
| 2373 | ptrdiff_t temp; |
| 2374 | left_end_byte = start_byte + LEFT_TOTAL_LENGTH (i); |
| 2375 | left_end = BYTE_TO_CHAR (left_end_byte); |
| 2376 | |
| 2377 | temp = CHAR_TO_BYTE (left_end); |
| 2378 | |
| 2379 | /* If LEFT_END_BYTE is in the middle of a character, |
| 2380 | adjust it and LEFT_END to a char boundary. */ |
| 2381 | if (left_end_byte > temp) |
| 2382 | { |
| 2383 | left_end_byte = temp; |
| 2384 | } |
| 2385 | if (left_end_byte < temp) |
| 2386 | { |
| 2387 | left_end--; |
| 2388 | left_end_byte = CHAR_TO_BYTE (left_end); |
| 2389 | } |
| 2390 | } |
| 2391 | else |
| 2392 | { |
| 2393 | left_end = start + LEFT_TOTAL_LENGTH (i); |
| 2394 | left_end_byte = CHAR_TO_BYTE (left_end); |
| 2395 | } |
| 2396 | |
| 2397 | set_intervals_multibyte_1 (i->left, multi_flag, start, start_byte, |
| 2398 | left_end, left_end_byte); |
| 2399 | } |
| 2400 | if (i->right) |
| 2401 | { |
| 2402 | ptrdiff_t right_start_byte, right_start; |
| 2403 | |
| 2404 | if (multi_flag) |
| 2405 | { |
| 2406 | ptrdiff_t temp; |
| 2407 | |
| 2408 | right_start_byte = end_byte - RIGHT_TOTAL_LENGTH (i); |
| 2409 | right_start = BYTE_TO_CHAR (right_start_byte); |
| 2410 | |
| 2411 | /* If RIGHT_START_BYTE is in the middle of a character, |
| 2412 | adjust it and RIGHT_START to a char boundary. */ |
| 2413 | temp = CHAR_TO_BYTE (right_start); |
| 2414 | |
| 2415 | if (right_start_byte < temp) |
| 2416 | { |
| 2417 | right_start_byte = temp; |
| 2418 | } |
| 2419 | if (right_start_byte > temp) |
| 2420 | { |
| 2421 | right_start++; |
| 2422 | right_start_byte = CHAR_TO_BYTE (right_start); |
| 2423 | } |
| 2424 | } |
| 2425 | else |
| 2426 | { |
| 2427 | right_start = end - RIGHT_TOTAL_LENGTH (i); |
| 2428 | right_start_byte = CHAR_TO_BYTE (right_start); |
| 2429 | } |
| 2430 | |
| 2431 | set_intervals_multibyte_1 (i->right, multi_flag, |
| 2432 | right_start, right_start_byte, |
| 2433 | end, end_byte); |
| 2434 | } |
| 2435 | |
| 2436 | /* Rounding to char boundaries can theoretically ake this interval |
| 2437 | spurious. If so, delete one child, and copy its property list |
| 2438 | to this interval. */ |
| 2439 | if (LEFT_TOTAL_LENGTH (i) + RIGHT_TOTAL_LENGTH (i) >= TOTAL_LENGTH (i)) |
| 2440 | { |
| 2441 | if ((i)->left) |
| 2442 | { |
| 2443 | set_interval_plist (i, i->left->plist); |
| 2444 | (i)->left->total_length = 0; |
| 2445 | delete_interval ((i)->left); |
| 2446 | } |
| 2447 | else |
| 2448 | { |
| 2449 | set_interval_plist (i, i->right->plist); |
| 2450 | (i)->right->total_length = 0; |
| 2451 | delete_interval ((i)->right); |
| 2452 | } |
| 2453 | } |
| 2454 | } |
| 2455 | |
| 2456 | /* Update the intervals of the current buffer |
| 2457 | to fit the contents as multibyte (if MULTI_FLAG) |
| 2458 | or to fit them as non-multibyte (if not MULTI_FLAG). */ |
| 2459 | |
| 2460 | void |
| 2461 | set_intervals_multibyte (bool multi_flag) |
| 2462 | { |
| 2463 | INTERVAL i = buffer_intervals (current_buffer); |
| 2464 | |
| 2465 | if (i) |
| 2466 | set_intervals_multibyte_1 (i, multi_flag, BEG, BEG_BYTE, Z, Z_BYTE); |
| 2467 | } |