chartab.c 27.4 KB
Newer Older
1
/* chartab.c -- char-table support
2
   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
3 4 5 6 7
     National Institute of Advanced Industrial Science and Technology (AIST)
     Registration Number H13PRO009

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
12 13 14 15 16 17 18

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
20 21

#include <config.h>
22
#include <setjmp.h>
23 24 25 26
#include "lisp.h"
#include "character.h"
#include "charset.h"
#include "ccl.h"
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

/* 64/16/32/128 */

/* Number of elements in Nth level char-table.  */
const int chartab_size[4] =
  { (1 << CHARTAB_SIZE_BITS_0),
    (1 << CHARTAB_SIZE_BITS_1),
    (1 << CHARTAB_SIZE_BITS_2),
    (1 << CHARTAB_SIZE_BITS_3) };

/* Number of characters each element of Nth level char-table
   covers.  */
const int chartab_chars[4] =
  { (1 << (CHARTAB_SIZE_BITS_1 + CHARTAB_SIZE_BITS_2 + CHARTAB_SIZE_BITS_3)),
    (1 << (CHARTAB_SIZE_BITS_2 + CHARTAB_SIZE_BITS_3)),
    (1 << CHARTAB_SIZE_BITS_3),
    1 };

/* Number of characters (in bits) each element of Nth level char-table
   covers.  */
const int chartab_bits[4] =
  { (CHARTAB_SIZE_BITS_1 + CHARTAB_SIZE_BITS_2 + CHARTAB_SIZE_BITS_3),
    (CHARTAB_SIZE_BITS_2 + CHARTAB_SIZE_BITS_3),
    CHARTAB_SIZE_BITS_3,
    0 };

#define CHARTAB_IDX(c, depth, min_char)		\
  (((c) - (min_char)) >> chartab_bits[(depth)])


57
DEFUE ("make-char-table", Fmake_char_table, Smake_char_table, 1, 2, 0,
58
       doc: /* Return a newly created char-table, with purpose PURPOSE.
59 60
Each element is initialized to INIT, which defaults to nil.

61 62 63 64
PURPOSE should be a symbol.  If it has a `char-table-extra-slots'
property, the property's value should be an integer between 0 and 10
that specifies how many extra slots the char-table has.  Otherwise,
the char-table has no extra slot.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
65
  (register Lisp_Object purpose, Lisp_Object init)
66 67 68
{
  Lisp_Object vector;
  Lisp_Object n;
69
  int n_extras;
70 71 72
  int size;

  CHECK_SYMBOL (purpose);
73 74 75 76
  n = Fget (purpose, Qchar_table_extra_slots);
  if (NILP (n))
    n_extras = 0;
  else
77
    {
78 79 80 81
      CHECK_NATNUM (n);
      n_extras = XINT (n);
      if (n_extras > 10)
	args_out_of_range (n, Qnil);
82 83 84 85
    }

  size = VECSIZE (struct Lisp_Char_Table) - 1 + n_extras;
  vector = Fmake_vector (make_number (size), init);
Miles Bader's avatar
Miles Bader committed
86
  XSETPVECTYPE (XVECTOR (vector), PVEC_CHAR_TABLE);
87 88 89 90 91 92 93
  XCHAR_TABLE (vector)->parent = Qnil;
  XCHAR_TABLE (vector)->purpose = purpose;
  XSETCHAR_TABLE (vector, XCHAR_TABLE (vector));
  return vector;
}

static Lisp_Object
94
make_sub_char_table (int depth, int min_char, Lisp_Object defalt)
95 96 97 98 99
{
  Lisp_Object table;
  int size = VECSIZE (struct Lisp_Sub_Char_Table) - 1 + chartab_size[depth];

  table = Fmake_vector (make_number (size), defalt);
Miles Bader's avatar
Miles Bader committed
100
  XSETPVECTYPE (XVECTOR (table), PVEC_SUB_CHAR_TABLE);
101 102 103 104 105 106 107
  XSUB_CHAR_TABLE (table)->depth = make_number (depth);
  XSUB_CHAR_TABLE (table)->min_char = make_number (min_char);

  return table;
}

static Lisp_Object
108
char_table_ascii (Lisp_Object table)
109 110 111 112
{
  Lisp_Object sub;

  sub = XCHAR_TABLE (table)->contents[0];
113 114
  if (! SUB_CHAR_TABLE_P (sub))
    return sub;
115
  sub = XSUB_CHAR_TABLE (sub)->contents[0];
116 117
  if (! SUB_CHAR_TABLE_P (sub))
    return sub;
118 119 120
  return XSUB_CHAR_TABLE (sub)->contents[0];
}

121
static Lisp_Object
122
copy_sub_char_table (Lisp_Object table)
123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145
{
  Lisp_Object copy;
  int depth = XINT (XSUB_CHAR_TABLE (table)->depth);
  int min_char = XINT (XSUB_CHAR_TABLE (table)->min_char);
  Lisp_Object val;
  int i;

  copy = make_sub_char_table (depth, min_char, Qnil);
  /* Recursively copy any sub char-tables.  */
  for (i = 0; i < chartab_size[depth]; i++)
    {
      val = XSUB_CHAR_TABLE (table)->contents[i];
      if (SUB_CHAR_TABLE_P (val))
	XSUB_CHAR_TABLE (copy)->contents[i] = copy_sub_char_table (val);
      else
	XSUB_CHAR_TABLE (copy)->contents[i] = val;
    }

  return copy;
}


Lisp_Object
146
copy_char_table (Lisp_Object table)
147 148 149 150 151 152
{
  Lisp_Object copy;
  int size = XCHAR_TABLE (table)->size & PSEUDOVECTOR_SIZE_MASK;
  int i;

  copy = Fmake_vector (make_number (size), Qnil);
Miles Bader's avatar
Miles Bader committed
153
  XSETPVECTYPE (XVECTOR (copy), PVEC_CHAR_TABLE);
154 155 156 157 158 159 160 161
  XCHAR_TABLE (copy)->defalt = XCHAR_TABLE (table)->defalt;
  XCHAR_TABLE (copy)->parent = XCHAR_TABLE (table)->parent;
  XCHAR_TABLE (copy)->purpose = XCHAR_TABLE (table)->purpose;
  for (i = 0; i < chartab_size[0]; i++)
    XCHAR_TABLE (copy)->contents[i]
      = (SUB_CHAR_TABLE_P (XCHAR_TABLE (table)->contents[i])
	 ? copy_sub_char_table (XCHAR_TABLE (table)->contents[i])
	 : XCHAR_TABLE (table)->contents[i]);
162
  XCHAR_TABLE (copy)->ascii = char_table_ascii (copy);
163 164 165 166 167 168 169 170
  size -= VECSIZE (struct Lisp_Char_Table) - 1;
  for (i = 0; i < size; i++)
    XCHAR_TABLE (copy)->extras[i] = XCHAR_TABLE (table)->extras[i];

  XSETCHAR_TABLE (copy, XCHAR_TABLE (copy));
  return copy;
}

Andreas Schwab's avatar
Andreas Schwab committed
171
static Lisp_Object
172
sub_char_table_ref (Lisp_Object table, int c)
173 174 175 176 177 178 179 180 181 182 183 184 185
{
  struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
  int depth = XINT (tbl->depth);
  int min_char = XINT (tbl->min_char);
  Lisp_Object val;

  val = tbl->contents[CHARTAB_IDX (c, depth, min_char)];
  if (SUB_CHAR_TABLE_P (val))
    val = sub_char_table_ref (val, c);
  return val;
}

Lisp_Object
186
char_table_ref (Lisp_Object table, int c)
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
{
  struct Lisp_Char_Table *tbl = XCHAR_TABLE (table);
  Lisp_Object val;

  if (ASCII_CHAR_P (c))
    {
      val = tbl->ascii;
      if (SUB_CHAR_TABLE_P (val))
	val = XSUB_CHAR_TABLE (val)->contents[c];
    }
  else
    {
      val = tbl->contents[CHARTAB_IDX (c, 0, 0)];
      if (SUB_CHAR_TABLE_P (val))
	val = sub_char_table_ref (val, c);
    }
  if (NILP (val))
    {
      val = tbl->defalt;
      if (NILP (val) && CHAR_TABLE_P (tbl->parent))
	val = char_table_ref (tbl->parent, c);
    }
  return val;
Kenichi Handa's avatar
Kenichi Handa committed
210
}
211 212

static Lisp_Object
213
sub_char_table_ref_and_range (Lisp_Object table, int c, int *from, int *to, Lisp_Object defalt)
214 215 216 217
{
  struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
  int depth = XINT (tbl->depth);
  int min_char = XINT (tbl->min_char);
218
  int chartab_idx = CHARTAB_IDX (c, depth, min_char), idx;
219
  Lisp_Object val;
Kenichi Handa's avatar
Kenichi Handa committed
220

221
  val = tbl->contents[chartab_idx];
222 223 224 225 226
  if (SUB_CHAR_TABLE_P (val))
    val = sub_char_table_ref_and_range (val, c, from, to, defalt);
  else if (NILP (val))
    val = defalt;

227
  idx = chartab_idx;
228
  while (idx > 0 && *from < min_char + idx * chartab_chars[depth])
229
    {
230 231
      Lisp_Object this_val;

232 233 234
      c = min_char + idx * chartab_chars[depth] - 1;
      idx--;
      this_val = tbl->contents[idx];
235
      if (SUB_CHAR_TABLE_P (this_val))
236
	this_val = sub_char_table_ref_and_range (this_val, c, from, to, defalt);
237 238 239 240
      else if (NILP (this_val))
	this_val = defalt;

      if (! EQ (this_val, val))
241 242 243 244
	{
	  *from = c + 1;
	  break;
	}
245
    }
246 247 248
  while (((c = (chartab_idx + 1) * chartab_chars[depth])
	  < chartab_chars[depth - 1])
	 && (c += min_char) <= *to)
249
    {
250 251
      Lisp_Object this_val;

252 253
      chartab_idx++;
      this_val = tbl->contents[chartab_idx];
254
      if (SUB_CHAR_TABLE_P (this_val))
255
	this_val = sub_char_table_ref_and_range (this_val, c, from, to, defalt);
256 257 258
      else if (NILP (this_val))
	this_val = defalt;
      if (! EQ (this_val, val))
259 260 261 262
	{
	  *to = c - 1;
	  break;
	}
263
    }
264

265 266 267 268
  return val;
}


269 270 271 272
/* Return the value for C in char-table TABLE.  Shrink the range *FROM
   and *TO to cover characters (containing C) that have the same value
   as C.  It is not assured that the values of (*FROM - 1) and (*TO +
   1) are different from that of C.  */
273

274
Lisp_Object
275
char_table_ref_and_range (Lisp_Object table, int c, int *from, int *to)
276 277
{
  struct Lisp_Char_Table *tbl = XCHAR_TABLE (table);
278
  int chartab_idx = CHARTAB_IDX (c, 0, 0), idx;
279 280
  Lisp_Object val;

281
  val = tbl->contents[chartab_idx];
282 283 284 285
  if (*from < 0)
    *from = 0;
  if (*to < 0)
    *to = MAX_CHAR;
286 287 288 289 290
  if (SUB_CHAR_TABLE_P (val))
    val = sub_char_table_ref_and_range (val, c, from, to, tbl->defalt);
  else if (NILP (val))
    val = tbl->defalt;

291
  idx = chartab_idx;
292
  while (*from < idx * chartab_chars[0])
293
    {
294 295
      Lisp_Object this_val;

296 297 298
      c = idx * chartab_chars[0] - 1;
      idx--;
      this_val = tbl->contents[idx];
299
      if (SUB_CHAR_TABLE_P (this_val))
300
	this_val = sub_char_table_ref_and_range (this_val, c, from, to,
301 302 303 304 305
						 tbl->defalt);
      else if (NILP (this_val))
	this_val = tbl->defalt;

      if (! EQ (this_val, val))
306 307 308 309
	{
	  *from = c + 1;
	  break;
	}
310
    }
311
  while (*to >= (chartab_idx + 1) * chartab_chars[0])
312
    {
313 314
      Lisp_Object this_val;

315 316 317
      chartab_idx++;
      c = chartab_idx * chartab_chars[0];
      this_val = tbl->contents[chartab_idx];
318
      if (SUB_CHAR_TABLE_P (this_val))
319
	this_val = sub_char_table_ref_and_range (this_val, c, from, to,
320 321 322 323
						 tbl->defalt);
      else if (NILP (this_val))
	this_val = tbl->defalt;
      if (! EQ (this_val, val))
324 325 326 327
	{
	  *to = c - 1;
	  break;
	}
328 329 330
    }

  return val;
331
}
332 333 334


static void
335
sub_char_table_set (Lisp_Object table, int c, Lisp_Object val)
336 337 338 339 340 341
{
  struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
  int depth = XINT ((tbl)->depth);
  int min_char = XINT ((tbl)->min_char);
  int i = CHARTAB_IDX (c, depth, min_char);
  Lisp_Object sub;
Kenichi Handa's avatar
Kenichi Handa committed
342

343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
  if (depth == 3)
    tbl->contents[i] = val;
  else
    {
      sub = tbl->contents[i];
      if (! SUB_CHAR_TABLE_P (sub))
	{
	  sub = make_sub_char_table (depth + 1,
				     min_char + i * chartab_chars[depth], sub);
	  tbl->contents[i] = sub;
	}
      sub_char_table_set (sub, c, val);
    }
}

Lisp_Object
359
char_table_set (Lisp_Object table, int c, Lisp_Object val)
360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
{
  struct Lisp_Char_Table *tbl = XCHAR_TABLE (table);

  if (ASCII_CHAR_P (c)
      && SUB_CHAR_TABLE_P (tbl->ascii))
    {
      XSUB_CHAR_TABLE (tbl->ascii)->contents[c] = val;
    }
  else
    {
      int i = CHARTAB_IDX (c, 0, 0);
      Lisp_Object sub;

      sub = tbl->contents[i];
      if (! SUB_CHAR_TABLE_P (sub))
	{
	  sub = make_sub_char_table (1, i * chartab_chars[0], sub);
	  tbl->contents[i] = sub;
	}
      sub_char_table_set (sub, c, val);
      if (ASCII_CHAR_P (c))
381
	tbl->ascii = char_table_ascii (table);
382 383 384 385 386
    }
  return val;
}

static void
387
sub_char_table_set_range (Lisp_Object *table, int depth, int min_char, int from, int to, Lisp_Object val)
388 389 390
{
  int max_char = min_char + chartab_chars[depth] - 1;

Kenichi Handa's avatar
Kenichi Handa committed
391
  if (depth == 3 || (from <= min_char && to >= max_char))
392 393 394
    *table = val;
  else
    {
395 396
      int i;
      unsigned j;
397 398 399 400 401 402 403 404

      depth++;
      if (! SUB_CHAR_TABLE_P (*table))
	*table = make_sub_char_table (depth, min_char, *table);
      if (from < min_char)
	from = min_char;
      if (to > max_char)
	to = max_char;
405
      i = CHARTAB_IDX (from, depth, min_char);
406
      j = CHARTAB_IDX (to, depth, min_char);
407
      min_char += chartab_chars[depth] * i;
408
      for (j++; i < j; i++, min_char += chartab_chars[depth])
409
	sub_char_table_set_range (XSUB_CHAR_TABLE (*table)->contents + i,
410
				  depth, min_char, from, to, val);
411 412 413 414 415
    }
}


Lisp_Object
416
char_table_set_range (Lisp_Object table, int from, int to, Lisp_Object val)
417 418 419
{
  struct Lisp_Char_Table *tbl = XCHAR_TABLE (table);
  Lisp_Object *contents = tbl->contents;
420
  int i;
421 422 423 424 425

  if (from == to)
    char_table_set (table, from, val);
  else
    {
426 427 428 429
      unsigned lim = to / chartab_chars[0] + 1;
      for (i = CHARTAB_IDX (from, 0, 0); i < lim; i++)
	sub_char_table_set_range (contents + i, 0, i * chartab_chars[0],
				  from, to, val);
430
      if (ASCII_CHAR_P (from))
431
	tbl->ascii = char_table_ascii (table);
432 433 434 435 436 437 438 439 440
    }
  return val;
}


DEFUN ("char-table-subtype", Fchar_table_subtype, Schar_table_subtype,
       1, 1, 0,
       doc: /*
Return the subtype of char-table CHAR-TABLE.  The value is a symbol.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
441
  (Lisp_Object char_table)
442 443 444 445 446 447 448 449 450 451 452 453 454
{
  CHECK_CHAR_TABLE (char_table);

  return XCHAR_TABLE (char_table)->purpose;
}

DEFUN ("char-table-parent", Fchar_table_parent, Schar_table_parent,
       1, 1, 0,
       doc: /* Return the parent char-table of CHAR-TABLE.
The value is either nil or another char-table.
If CHAR-TABLE holds nil for a given character,
then the actual applicable value is inherited from the parent char-table
\(or from its parents, if necessary).  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
455
  (Lisp_Object char_table)
456 457 458 459 460 461
{
  CHECK_CHAR_TABLE (char_table);

  return XCHAR_TABLE (char_table)->parent;
}

462
DEFUE ("set-char-table-parent", Fset_char_table_parent, Sset_char_table_parent,
463 464
       2, 2, 0,
       doc: /* Set the parent char-table of CHAR-TABLE to PARENT.
Kenichi Handa's avatar
Kenichi Handa committed
465
Return PARENT.  PARENT must be either nil or another char-table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
466
  (Lisp_Object char_table, Lisp_Object parent)
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485
{
  Lisp_Object temp;

  CHECK_CHAR_TABLE (char_table);

  if (!NILP (parent))
    {
      CHECK_CHAR_TABLE (parent);

      for (temp = parent; !NILP (temp); temp = XCHAR_TABLE (temp)->parent)
	if (EQ (temp, char_table))
	  error ("Attempt to make a chartable be its own parent");
    }

  XCHAR_TABLE (char_table)->parent = parent;

  return parent;
}

486
DEFUE ("char-table-extra-slot", Fchar_table_extra_slot, Schar_table_extra_slot,
487 488
       2, 2, 0,
       doc: /* Return the value of CHAR-TABLE's extra-slot number N.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
489
  (Lisp_Object char_table, Lisp_Object n)
490 491 492 493 494 495 496 497 498 499
{
  CHECK_CHAR_TABLE (char_table);
  CHECK_NUMBER (n);
  if (XINT (n) < 0
      || XINT (n) >= CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (char_table)))
    args_out_of_range (char_table, n);

  return XCHAR_TABLE (char_table)->extras[XINT (n)];
}

500
DEFUE ("set-char-table-extra-slot", Fset_char_table_extra_slot,
501 502 503
       Sset_char_table_extra_slot,
       3, 3, 0,
       doc: /* Set CHAR-TABLE's extra-slot number N to VALUE.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
504
  (Lisp_Object char_table, Lisp_Object n, Lisp_Object value)
505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
{
  CHECK_CHAR_TABLE (char_table);
  CHECK_NUMBER (n);
  if (XINT (n) < 0
      || XINT (n) >= CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (char_table)))
    args_out_of_range (char_table, n);

  return XCHAR_TABLE (char_table)->extras[XINT (n)] = value;
}

DEFUN ("char-table-range", Fchar_table_range, Schar_table_range,
       2, 2, 0,
       doc: /* Return the value in CHAR-TABLE for a range of characters RANGE.
RANGE should be nil (for the default value),
a cons of character codes (for characters in the range), or a character code.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
520
  (Lisp_Object char_table, Lisp_Object range)
521 522 523 524 525 526 527 528 529 530 531 532
{
  Lisp_Object val;
  CHECK_CHAR_TABLE (char_table);

  if (EQ (range, Qnil))
    val = XCHAR_TABLE (char_table)->defalt;
  else if (INTEGERP (range))
    val = CHAR_TABLE_REF (char_table, XINT (range));
  else if (CONSP (range))
    {
      int from, to;

Kenichi Handa's avatar
Kenichi Handa committed
533 534
      CHECK_CHARACTER_CAR (range);
      CHECK_CHARACTER_CDR (range);
535 536 537 538 539 540 541 542 543
      val = char_table_ref_and_range (char_table, XINT (XCAR (range)),
				      &from, &to);
      /* Not yet implemented. */
    }
  else
    error ("Invalid RANGE argument to `char-table-range'");
  return val;
}

544
DEFUE ("set-char-table-range", Fset_char_table_range, Sset_char_table_range,
545
       3, 3, 0,
Kenichi Handa's avatar
Kenichi Handa committed
546
       doc: /* Set the value in CHAR-TABLE for a range of characters RANGE to VALUE.
547
RANGE should be t (for all characters), nil (for the default value),
Kenichi Handa's avatar
Kenichi Handa committed
548 549
a cons of character codes (for characters in the range),
or a character code.  Return VALUE.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
550
  (Lisp_Object char_table, Lisp_Object range, Lisp_Object value)
551 552 553 554 555 556
{
  CHECK_CHAR_TABLE (char_table);
  if (EQ (range, Qt))
    {
      int i;

557
      XCHAR_TABLE (char_table)->ascii = value;
558
      for (i = 0; i < chartab_size[0]; i++)
559
	XCHAR_TABLE (char_table)->contents[i] = value;
560 561 562 563 564 565 566
    }
  else if (EQ (range, Qnil))
    XCHAR_TABLE (char_table)->defalt = value;
  else if (INTEGERP (range))
    char_table_set (char_table, XINT (range), value);
  else if (CONSP (range))
    {
Kenichi Handa's avatar
Kenichi Handa committed
567 568
      CHECK_CHARACTER_CAR (range);
      CHECK_CHARACTER_CDR (range);
569 570 571 572 573 574 575 576 577 578 579 580
      char_table_set_range (char_table,
			    XINT (XCAR (range)), XINT (XCDR (range)), value);
    }
  else
    error ("Invalid RANGE argument to `set-char-table-range'");

  return value;
}

DEFUN ("set-char-table-default", Fset_char_table_default,
       Sset_char_table_default, 3, 3, 0,
       doc: /*
581
This function is obsolete and has no effect.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
582
  (Lisp_Object char_table, Lisp_Object ch, Lisp_Object value)
583 584 585 586 587
{
  return Qnil;
}

/* Look up the element in TABLE at index CH, and return it as an
588
   integer.  If the element is not a character, return CH itself.  */
589 590

int
591
char_table_translate (Lisp_Object table, int ch)
592 593 594
{
  Lisp_Object value;
  value = Faref (table, make_number (ch));
595
  if (! CHARACTERP (value))
596 597 598 599 600
    return ch;
  return XINT (value);
}

static Lisp_Object
601
optimize_sub_char_table (Lisp_Object table, Lisp_Object test)
602 603 604 605
{
  struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
  int depth = XINT (tbl->depth);
  Lisp_Object elt, this;
606
  int i, optimizable;
607 608 609

  elt = XSUB_CHAR_TABLE (table)->contents[0];
  if (SUB_CHAR_TABLE_P (elt))
610 611
    elt = XSUB_CHAR_TABLE (table)->contents[0]
      = optimize_sub_char_table (elt, test);
612
  optimizable = SUB_CHAR_TABLE_P (elt) ? 0 : 1;
613 614 615 616 617
  for (i = 1; i < chartab_size[depth]; i++)
    {
      this = XSUB_CHAR_TABLE (table)->contents[i];
      if (SUB_CHAR_TABLE_P (this))
	this = XSUB_CHAR_TABLE (table)->contents[i]
618
	  = optimize_sub_char_table (this, test);
619 620
      if (optimizable
	  && (NILP (test) ? NILP (Fequal (this, elt)) /* defaults to `equal'. */
621 622
	      : EQ (test, Qeq) ? !EQ (this, elt)      /* Optimize `eq' case.  */
	      : NILP (call2 (test, this, elt))))
623
	optimizable = 0;
624 625
    }

626
  return (optimizable ? elt : table);
627 628
}

629
DEFUE ("optimize-char-table", Foptimize_char_table, Soptimize_char_table,
630 631 632 633
       1, 2, 0,
       doc: /* Optimize CHAR-TABLE.
TEST is the comparison function used to decide whether two entries are
equivalent and can be merged.  It defaults to `equal'.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
634
  (Lisp_Object char_table, Lisp_Object test)
635 636 637 638 639 640 641 642 643 644
{
  Lisp_Object elt;
  int i;

  CHECK_CHAR_TABLE (char_table);

  for (i = 0; i < chartab_size[0]; i++)
    {
      elt = XCHAR_TABLE (char_table)->contents[i];
      if (SUB_CHAR_TABLE_P (elt))
645 646
	XCHAR_TABLE (char_table)->contents[i]
	  = optimize_sub_char_table (elt, test);
647
    }
648 649 650
  /* Reset the `ascii' cache, in case it got optimized away.  */
  XCHAR_TABLE (char_table)->ascii = char_table_ascii (char_table);

651 652 653 654
  return Qnil;
}


655 656 657 658 659 660 661 662 663 664 665 666 667 668
/* Map C_FUNCTION or FUNCTION over TABLE (top or sub char-table),
   calling it for each character or group of characters that share a
   value.  RANGE is a cons (FROM . TO) specifying the range of target
   characters, VAL is a value of FROM in TABLE, DEFAULT_VAL is the
   default value of the char-table, PARENT is the parent of the
   char-table.

   ARG is passed to C_FUNCTION when that is called.

   It returns the value of last character covered by TABLE (not the
   value inheritted from the parent), and by side-effect, the car part
   of RANGE is updated to the minimum character C where C and all the
   following characters in TABLE have the same value.  */

669
static Lisp_Object
670 671 672
map_sub_char_table (void (*c_function) (Lisp_Object, Lisp_Object, Lisp_Object),
		    Lisp_Object function, Lisp_Object table, Lisp_Object arg, Lisp_Object val,
		    Lisp_Object range, Lisp_Object default_val, Lisp_Object parent)
673
{
674 675 676 677 678 679 680 681 682
  /* Pointer to the elements of TABLE. */
  Lisp_Object *contents;
  /* Depth of TABLE.  */
  int depth;
  /* Minimum and maxinum characters covered by TABLE. */
  int min_char, max_char;
  /* Number of characters covered by one element of TABLE.  */
  int chars_in_block;
  int from = XINT (XCAR (range)), to = XINT (XCDR (range));
683 684
  int i, c;

685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
  if (SUB_CHAR_TABLE_P (table))
    {
      struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);

      depth = XINT (tbl->depth);
      contents = tbl->contents;
      min_char = XINT (tbl->min_char);
      max_char = min_char + chartab_chars[depth - 1] - 1;
    }
  else
    {
      depth = 0;
      contents = XCHAR_TABLE (table)->contents;
      min_char = 0;
      max_char = MAX_CHAR;
    }
  chars_in_block = chartab_chars[depth];

  if (to < max_char)
    max_char = to;
  /* Set I to the index of the first element to check.  */
  if (from <= min_char)
    i = 0;
  else
    i = (from - min_char) / chars_in_block;
  for (c = min_char + chars_in_block * i; c <= max_char;
       i++, c += chars_in_block)
712
    {
713 714
      Lisp_Object this = contents[i];
      int nextc = c + chars_in_block;
715 716

      if (SUB_CHAR_TABLE_P (this))
717 718 719 720 721 722
	{
	  if (to >= nextc)
	    XSETCDR (range, make_number (nextc - 1));
	  val = map_sub_char_table (c_function, function, this, arg,
				    val, range, default_val, parent);
	}
723
      else
724
	{
725 726
	  if (NILP (this))
	    this = default_val;
727
	  if (!EQ (val, this))
728
	    {
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
	      int different_value = 1;

	      if (NILP (val))
		{
		  if (! NILP (parent))
		    {
		      Lisp_Object temp = XCHAR_TABLE (parent)->parent;

		      /* This is to get a value of FROM in PARENT
			 without checking the parent of PARENT.  */
		      XCHAR_TABLE (parent)->parent = Qnil;
		      val = CHAR_TABLE_REF (parent, from);
		      XCHAR_TABLE (parent)->parent = temp;
		      XSETCDR (range, make_number (c - 1));
		      val = map_sub_char_table (c_function, function,
						parent, arg, val, range,
						XCHAR_TABLE (parent)->defalt,
						XCHAR_TABLE (parent)->parent);
747
		      if (EQ (val, this))
748 749 750 751
			different_value = 0;
		    }
		}
	      if (! NILP (val) && different_value)
752
		{
Kenichi Handa's avatar
Kenichi Handa committed
753
		  XSETCDR (range, make_number (c - 1));
754
		  if (EQ (XCAR (range), XCDR (range)))
755 756 757 758 759 760
		    {
		      if (c_function)
			(*c_function) (arg, XCAR (range), val);
		      else
			call2 (function, XCAR (range), val);
		    }
761
		  else
762 763 764 765 766 767
		    {
		      if (c_function)
			(*c_function) (arg, range, val);
		      else
			call2 (function, range, val);
		    }
768
		}
769
	      val = this;
770
	      from = c;
Kenichi Handa's avatar
Kenichi Handa committed
771
	      XSETCAR (range, make_number (c));
772 773
	    }
	}
774
      XSETCDR (range, make_number (to));
775 776 777 778 779 780 781 782
    }
  return val;
}


/* Map C_FUNCTION or FUNCTION over TABLE, calling it for each
   character or group of characters that share a value.

Kenichi Handa's avatar
Kenichi Handa committed
783
   ARG is passed to C_FUNCTION when that is called.  */
784 785

void
786
map_char_table (void (*c_function) (Lisp_Object, Lisp_Object, Lisp_Object), Lisp_Object function, Lisp_Object table, Lisp_Object arg)
787 788
{
  Lisp_Object range, val;
789
  struct gcpro gcpro1, gcpro2, gcpro3;
790

791
  range = Fcons (make_number (0), make_number (MAX_CHAR));
792
  GCPRO3 (table, arg, range);
793 794 795
  val = XCHAR_TABLE (table)->ascii;
  if (SUB_CHAR_TABLE_P (val))
    val = XSUB_CHAR_TABLE (val)->contents[0];
796 797 798 799 800 801
  val = map_sub_char_table (c_function, function, table, arg, val, range,
			    XCHAR_TABLE (table)->defalt,
			    XCHAR_TABLE (table)->parent);
  /* If VAL is nil and TABLE has a parent, we must consult the parent
     recursively.  */
  while (NILP (val) && ! NILP (XCHAR_TABLE (table)->parent))
802
    {
803 804 805 806 807 808 809 810 811 812 813 814 815
      Lisp_Object parent = XCHAR_TABLE (table)->parent;
      Lisp_Object temp = XCHAR_TABLE (parent)->parent;
      int from = XINT (XCAR (range));

      /* This is to get a value of FROM in PARENT without checking the
	 parent of PARENT.  */
      XCHAR_TABLE (parent)->parent = Qnil;
      val = CHAR_TABLE_REF (parent, from);
      XCHAR_TABLE (parent)->parent = temp;
      val = map_sub_char_table (c_function, function, parent, arg, val, range,
				XCHAR_TABLE (parent)->defalt,
				XCHAR_TABLE (parent)->parent);
      table = parent;
816
    }
817 818 819

  if (! NILP (val))
    {
820 821 822 823 824 825 826
      if (EQ (XCAR (range), XCDR (range)))
	{
	  if (c_function)
	    (*c_function) (arg, XCAR (range), val);
	  else
	    call2 (function, XCAR (range), val);
	}
827
      else
828 829 830 831 832 833
	{
	  if (c_function)
	    (*c_function) (arg, range, val);
	  else
	    call2 (function, range, val);
	}
834
    }
835 836

  UNGCPRO;
837 838 839 840 841
}

DEFUN ("map-char-table", Fmap_char_table, Smap_char_table,
  2, 2, 0,
       doc: /*
Kenichi Handa's avatar
Kenichi Handa committed
842
Call FUNCTION for each character in CHAR-TABLE that has non-nil value.
843
FUNCTION is called with two arguments--a key and a value.
844 845
The key is a character code or a cons of character codes specifying a
range of characters that have the same value.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
846
  (Lisp_Object function, Lisp_Object char_table)
847 848 849
{
  CHECK_CHAR_TABLE (char_table);

Kenichi Handa's avatar
Kenichi Handa committed
850
  map_char_table (NULL, function, char_table, char_table);
851 852 853
  return Qnil;
}

854 855

static void
856 857 858 859
map_sub_char_table_for_charset (void (*c_function) (Lisp_Object, Lisp_Object),
				Lisp_Object function, Lisp_Object table, Lisp_Object arg,
				Lisp_Object range, struct charset *charset,
				unsigned from, unsigned to)
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903
{
  struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
  int depth = XINT (tbl->depth);
  int c, i;

  if (depth < 3)
    for (i = 0, c = XINT (tbl->min_char); i < chartab_size[depth];
	 i++, c += chartab_chars[depth])
      {
	Lisp_Object this;

	this = tbl->contents[i];
	if (SUB_CHAR_TABLE_P (this))
	  map_sub_char_table_for_charset (c_function, function, this, arg,
					  range, charset, from, to);
	else
	  {
	    if (! NILP (XCAR (range)))
	      {
		XSETCDR (range, make_number (c - 1));
		if (c_function)
		  (*c_function) (arg, range);
		else
		  call2 (function, range, arg);
	      }
	    XSETCAR (range, Qnil);
	  }
      }
  else
    for (i = 0, c = XINT (tbl->min_char); i < chartab_size[depth]; i++, c ++)
      {
	Lisp_Object this;
	unsigned code;

	this = tbl->contents[i];
	if (NILP (this)
	    || (charset
		&& (code = ENCODE_CHAR (charset, c),
		    (code < from || code > to))))
	  {
	    if (! NILP (XCAR (range)))
	      {
		XSETCDR (range, make_number (c - 1));
		if (c_function)
904
		  (*c_function) (arg, range);
905 906 907 908 909 910 911 912 913 914 915 916 917 918
		else
		  call2 (function, range, arg);
		XSETCAR (range, Qnil);
	      }
	  }
	else
	  {
	    if (NILP (XCAR (range)))
	      XSETCAR (range, make_number (c));
	  }
      }
}


919
/* Support function for `map-charset-chars'.  Map C_FUNCTION or
Juanma Barranquero's avatar
Juanma Barranquero committed
920
   FUNCTION over TABLE, calling it for each character or a group of
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
   succeeding characters that have non-nil value in TABLE.  TABLE is a
   "mapping table" or a "deunifier table" of a certain charset.

   If CHARSET is not NULL (this is the case that `map-charset-chars'
   is called with non-nil FROM-CODE and TO-CODE), it is a charset who
   owns TABLE, and the function is called only on a character in the
   range FROM and TO.  FROM and TO are not character codes, but code
   points of a character in CHARSET.

   This function is called in these two cases:

   (1) A charset has a mapping file name in :map property.

   (2) A charset has an upper code space in :offset property and a
   mapping file name in :unify-map property.  In this case, this
   function is called only for characters in the Unicode code space.
   Characters in upper code space are handled directly in
   map_charset_chars.  */

940
void
941
map_char_table_for_charset (void (*c_function) (Lisp_Object, Lisp_Object),
942 943 944
			    Lisp_Object function, Lisp_Object table, Lisp_Object arg,
			    struct charset *charset,
			    unsigned from, unsigned to)
945 946 947
{
  Lisp_Object range;
  int c, i;
948
  struct gcpro gcpro1;
949

Kenichi Handa's avatar
Kenichi Handa committed
950
  range = Fcons (Qnil, Qnil);
951
  GCPRO1 (range);
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981

  for (i = 0, c = 0; i < chartab_size[0]; i++, c += chartab_chars[0])
    {
      Lisp_Object this;

      this = XCHAR_TABLE (table)->contents[i];
      if (SUB_CHAR_TABLE_P (this))
	map_sub_char_table_for_charset (c_function, function, this, arg,
					range, charset, from, to);
      else
	{
	  if (! NILP (XCAR (range)))
	    {
	      XSETCDR (range, make_number (c - 1));
	      if (c_function)
		(*c_function) (arg, range);
	      else
		call2 (function, range, arg);
	    }
	  XSETCAR (range, Qnil);
	}
    }
  if (! NILP (XCAR (range)))
    {
      XSETCDR (range, make_number (c - 1));
      if (c_function)
	(*c_function) (arg, range);
      else
	call2 (function, range, arg);
    }
982 983

  UNGCPRO;
984 985
}

986 987

void
988
syms_of_chartab (void)
989 990 991 992 993 994 995 996 997 998 999 1000 1001
{
  defsubr (&Smake_char_table);
  defsubr (&Schar_table_parent);
  defsubr (&Schar_table_subtype);
  defsubr (&Sset_char_table_parent);
  defsubr (&Schar_table_extra_slot);
  defsubr (&Sset_char_table_extra_slot);
  defsubr (&Schar_table_range);
  defsubr (&Sset_char_table_range);
  defsubr (&Sset_char_table_default);
  defsubr (&Soptimize_char_table);
  defsubr (&Smap_char_table);
}