| 1 | /* |
| 2 | * colorings of characters |
| 3 | * This file is #included by regcomp.c. |
| 4 | * |
| 5 | * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. |
| 6 | * |
| 7 | * Development of this software was funded, in part, by Cray Research Inc., |
| 8 | * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics |
| 9 | * Corporation, none of whom are responsible for the results. The author |
| 10 | * thanks all of them. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms -- with or without |
| 13 | * modification -- are permitted for any purpose, provided that |
| 14 | * redistributions in source form retain this entire copyright notice and |
| 15 | * indicate the origin and nature of any modifications. |
| 16 | * |
| 17 | * I'd appreciate being given credit for this package in the documentation |
| 18 | * of software which uses it, but that is not a requirement. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 21 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| 22 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| 23 | * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 26 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 28 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 29 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | * |
| 31 | * $Header$ |
| 32 | * |
| 33 | * |
| 34 | * Note that there are some incestuous relationships between this code and |
| 35 | * NFA arc maintenance, which perhaps ought to be cleaned up sometime. |
| 36 | */ |
| 37 | |
| 38 | |
| 39 | |
| 40 | #define CISERR() VISERR(cm->v) |
| 41 | #define CERR(e) VERR(cm->v, (e)) |
| 42 | |
| 43 | |
| 44 | |
| 45 | /* |
| 46 | * initcm - set up new colormap |
| 47 | */ |
| 48 | static void |
| 49 | initcm(struct vars * v, |
| 50 | struct colormap * cm) |
| 51 | { |
| 52 | int i; |
| 53 | int j; |
| 54 | union tree *t; |
| 55 | union tree *nextt; |
| 56 | struct colordesc *cd; |
| 57 | |
| 58 | cm->magic = CMMAGIC; |
| 59 | cm->v = v; |
| 60 | |
| 61 | cm->ncds = NINLINECDS; |
| 62 | cm->cd = cm->cdspace; |
| 63 | cm->max = 0; |
| 64 | cm->free = 0; |
| 65 | |
| 66 | cd = cm->cd; /* cm->cd[WHITE] */ |
| 67 | cd->sub = NOSUB; |
| 68 | cd->arcs = NULL; |
| 69 | cd->flags = 0; |
| 70 | cd->nchrs = CHR_MAX - CHR_MIN + 1; |
| 71 | |
| 72 | /* upper levels of tree */ |
| 73 | for (t = &cm->tree[0], j = NBYTS - 1; j > 0; t = nextt, j--) |
| 74 | { |
| 75 | nextt = t + 1; |
| 76 | for (i = BYTTAB - 1; i >= 0; i--) |
| 77 | t->tptr[i] = nextt; |
| 78 | } |
| 79 | /* bottom level is solid white */ |
| 80 | t = &cm->tree[NBYTS - 1]; |
| 81 | for (i = BYTTAB - 1; i >= 0; i--) |
| 82 | t->tcolor[i] = WHITE; |
| 83 | cd->block = t; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * freecm - free dynamically-allocated things in a colormap |
| 88 | */ |
| 89 | static void |
| 90 | freecm(struct colormap * cm) |
| 91 | { |
| 92 | size_t i; |
| 93 | union tree *cb; |
| 94 | |
| 95 | cm->magic = 0; |
| 96 | if (NBYTS > 1) |
| 97 | cmtreefree(cm, cm->tree, 0); |
| 98 | for (i = 1; i <= cm->max; i++) /* skip WHITE */ |
| 99 | if (!UNUSEDCOLOR(&cm->cd[i])) |
| 100 | { |
| 101 | cb = cm->cd[i].block; |
| 102 | if (cb != NULL) |
| 103 | FREE(cb); |
| 104 | } |
| 105 | if (cm->cd != cm->cdspace) |
| 106 | FREE(cm->cd); |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * cmtreefree - free a non-terminal part of a colormap tree |
| 111 | */ |
| 112 | static void |
| 113 | cmtreefree(struct colormap * cm, |
| 114 | union tree * tree, |
| 115 | int level) /* level number (top == 0) of this block */ |
| 116 | { |
| 117 | int i; |
| 118 | union tree *t; |
| 119 | union tree *fillt = &cm->tree[level + 1]; |
| 120 | union tree *cb; |
| 121 | |
| 122 | assert(level < NBYTS - 1); /* this level has pointers */ |
| 123 | for (i = BYTTAB - 1; i >= 0; i--) |
| 124 | { |
| 125 | t = tree->tptr[i]; |
| 126 | assert(t != NULL); |
| 127 | if (t != fillt) |
| 128 | { |
| 129 | if (level < NBYTS - 2) |
| 130 | { /* more pointer blocks below */ |
| 131 | cmtreefree(cm, t, level + 1); |
| 132 | FREE(t); |
| 133 | } |
| 134 | else |
| 135 | { /* color block below */ |
| 136 | cb = cm->cd[t->tcolor[0]].block; |
| 137 | if (t != cb) /* not a solid block */ |
| 138 | FREE(t); |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * setcolor - set the color of a character in a colormap |
| 146 | */ |
| 147 | static color /* previous color */ |
| 148 | setcolor(struct colormap * cm, |
| 149 | chr c, |
| 150 | pcolor co) |
| 151 | { |
| 152 | uchr uc = c; |
| 153 | int shift; |
| 154 | int level; |
| 155 | int b; |
| 156 | int bottom; |
| 157 | union tree *t; |
| 158 | union tree *newt; |
| 159 | union tree *fillt; |
| 160 | union tree *lastt; |
| 161 | union tree *cb; |
| 162 | color prev; |
| 163 | |
| 164 | assert(cm->magic == CMMAGIC); |
| 165 | if (CISERR() || co == COLORLESS) |
| 166 | return COLORLESS; |
| 167 | |
| 168 | t = cm->tree; |
| 169 | for (level = 0, shift = BYTBITS * (NBYTS - 1); shift > 0; |
| 170 | level++, shift -= BYTBITS) |
| 171 | { |
| 172 | b = (uc >> shift) & BYTMASK; |
| 173 | lastt = t; |
| 174 | t = lastt->tptr[b]; |
| 175 | assert(t != NULL); |
| 176 | fillt = &cm->tree[level + 1]; |
| 177 | bottom = (shift <= BYTBITS) ? 1 : 0; |
| 178 | cb = (bottom) ? cm->cd[t->tcolor[0]].block : fillt; |
| 179 | if (t == fillt || t == cb) |
| 180 | { /* must allocate a new block */ |
| 181 | newt = (union tree *) MALLOC((bottom) ? |
| 182 | sizeof(struct colors) : sizeof(struct ptrs)); |
| 183 | if (newt == NULL) |
| 184 | { |
| 185 | CERR(REG_ESPACE); |
| 186 | return COLORLESS; |
| 187 | } |
| 188 | if (bottom) |
| 189 | memcpy(VS(newt->tcolor), VS(t->tcolor), |
| 190 | BYTTAB * sizeof(color)); |
| 191 | else |
| 192 | memcpy(VS(newt->tptr), VS(t->tptr), |
| 193 | BYTTAB * sizeof(union tree *)); |
| 194 | t = newt; |
| 195 | lastt->tptr[b] = t; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | b = uc & BYTMASK; |
| 200 | prev = t->tcolor[b]; |
| 201 | t->tcolor[b] = (color) co; |
| 202 | return prev; |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * maxcolor - report largest color number in use |
| 207 | */ |
| 208 | static color |
| 209 | maxcolor(struct colormap * cm) |
| 210 | { |
| 211 | if (CISERR()) |
| 212 | return COLORLESS; |
| 213 | |
| 214 | return (color) cm->max; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * newcolor - find a new color (must be subject of setcolor at once) |
| 219 | * Beware: may relocate the colordescs. |
| 220 | */ |
| 221 | static color /* COLORLESS for error */ |
| 222 | newcolor(struct colormap * cm) |
| 223 | { |
| 224 | struct colordesc *cd; |
| 225 | struct colordesc *new; |
| 226 | size_t n; |
| 227 | |
| 228 | if (CISERR()) |
| 229 | return COLORLESS; |
| 230 | |
| 231 | if (cm->free != 0) |
| 232 | { |
| 233 | assert(cm->free > 0); |
| 234 | assert((size_t) cm->free < cm->ncds); |
| 235 | cd = &cm->cd[cm->free]; |
| 236 | assert(UNUSEDCOLOR(cd)); |
| 237 | assert(cd->arcs == NULL); |
| 238 | cm->free = cd->sub; |
| 239 | } |
| 240 | else if (cm->max < cm->ncds - 1) |
| 241 | { |
| 242 | cm->max++; |
| 243 | cd = &cm->cd[cm->max]; |
| 244 | } |
| 245 | else |
| 246 | { |
| 247 | /* oops, must allocate more */ |
| 248 | n = cm->ncds * 2; |
| 249 | if (cm->cd == cm->cdspace) |
| 250 | { |
| 251 | new = (struct colordesc *) MALLOC(n * |
| 252 | sizeof(struct colordesc)); |
| 253 | if (new != NULL) |
| 254 | memcpy(VS(new), VS(cm->cdspace), cm->ncds * |
| 255 | sizeof(struct colordesc)); |
| 256 | } |
| 257 | else |
| 258 | new = (struct colordesc *) REALLOC(cm->cd, |
| 259 | n * sizeof(struct colordesc)); |
| 260 | if (new == NULL) |
| 261 | { |
| 262 | CERR(REG_ESPACE); |
| 263 | return COLORLESS; |
| 264 | } |
| 265 | cm->cd = new; |
| 266 | cm->ncds = n; |
| 267 | assert(cm->max < cm->ncds - 1); |
| 268 | cm->max++; |
| 269 | cd = &cm->cd[cm->max]; |
| 270 | } |
| 271 | |
| 272 | cd->nchrs = 0; |
| 273 | cd->sub = NOSUB; |
| 274 | cd->arcs = NULL; |
| 275 | cd->flags = 0; |
| 276 | cd->block = NULL; |
| 277 | |
| 278 | return (color) (cd - cm->cd); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * freecolor - free a color (must have no arcs or subcolor) |
| 283 | */ |
| 284 | static void |
| 285 | freecolor(struct colormap * cm, |
| 286 | pcolor co) |
| 287 | { |
| 288 | struct colordesc *cd = &cm->cd[co]; |
| 289 | color pco, |
| 290 | nco; /* for freelist scan */ |
| 291 | |
| 292 | assert(co >= 0); |
| 293 | if (co == WHITE) |
| 294 | return; |
| 295 | |
| 296 | assert(cd->arcs == NULL); |
| 297 | assert(cd->sub == NOSUB); |
| 298 | assert(cd->nchrs == 0); |
| 299 | cd->flags = FREECOL; |
| 300 | if (cd->block != NULL) |
| 301 | { |
| 302 | FREE(cd->block); |
| 303 | cd->block = NULL; /* just paranoia */ |
| 304 | } |
| 305 | |
| 306 | if ((size_t) co == cm->max) |
| 307 | { |
| 308 | while (cm->max > WHITE && UNUSEDCOLOR(&cm->cd[cm->max])) |
| 309 | cm->max--; |
| 310 | assert(cm->free >= 0); |
| 311 | while ((size_t) cm->free > cm->max) |
| 312 | cm->free = cm->cd[cm->free].sub; |
| 313 | if (cm->free > 0) |
| 314 | { |
| 315 | assert(cm->free < cm->max); |
| 316 | pco = cm->free; |
| 317 | nco = cm->cd[pco].sub; |
| 318 | while (nco > 0) |
| 319 | if ((size_t) nco > cm->max) |
| 320 | { |
| 321 | /* take this one out of freelist */ |
| 322 | nco = cm->cd[nco].sub; |
| 323 | cm->cd[pco].sub = nco; |
| 324 | } |
| 325 | else |
| 326 | { |
| 327 | assert(nco < cm->max); |
| 328 | pco = nco; |
| 329 | nco = cm->cd[pco].sub; |
| 330 | } |
| 331 | } |
| 332 | } |
| 333 | else |
| 334 | { |
| 335 | cd->sub = cm->free; |
| 336 | cm->free = (color) (cd - cm->cd); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * pseudocolor - allocate a false color, to be managed by other means |
| 342 | */ |
| 343 | static color |
| 344 | pseudocolor(struct colormap * cm) |
| 345 | { |
| 346 | color co; |
| 347 | |
| 348 | co = newcolor(cm); |
| 349 | if (CISERR()) |
| 350 | return COLORLESS; |
| 351 | cm->cd[co].nchrs = 1; |
| 352 | cm->cd[co].flags = PSEUDO; |
| 353 | return co; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * subcolor - allocate a new subcolor (if necessary) to this chr |
| 358 | */ |
| 359 | static color |
| 360 | subcolor(struct colormap * cm, chr c) |
| 361 | { |
| 362 | color co; /* current color of c */ |
| 363 | color sco; /* new subcolor */ |
| 364 | |
| 365 | co = GETCOLOR(cm, c); |
| 366 | sco = newsub(cm, co); |
| 367 | if (CISERR()) |
| 368 | return COLORLESS; |
| 369 | assert(sco != COLORLESS); |
| 370 | |
| 371 | if (co == sco) /* already in an open subcolor */ |
| 372 | return co; /* rest is redundant */ |
| 373 | cm->cd[co].nchrs--; |
| 374 | cm->cd[sco].nchrs++; |
| 375 | setcolor(cm, c, sco); |
| 376 | return sco; |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * newsub - allocate a new subcolor (if necessary) for a color |
| 381 | */ |
| 382 | static color |
| 383 | newsub(struct colormap * cm, |
| 384 | pcolor co) |
| 385 | { |
| 386 | color sco; /* new subcolor */ |
| 387 | |
| 388 | sco = cm->cd[co].sub; |
| 389 | if (sco == NOSUB) |
| 390 | { /* color has no open subcolor */ |
| 391 | if (cm->cd[co].nchrs == 1) /* optimization */ |
| 392 | return co; |
| 393 | sco = newcolor(cm); /* must create subcolor */ |
| 394 | if (sco == COLORLESS) |
| 395 | { |
| 396 | assert(CISERR()); |
| 397 | return COLORLESS; |
| 398 | } |
| 399 | cm->cd[co].sub = sco; |
| 400 | cm->cd[sco].sub = sco; /* open subcolor points to self */ |
| 401 | } |
| 402 | assert(sco != NOSUB); |
| 403 | |
| 404 | return sco; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * subrange - allocate new subcolors to this range of chrs, fill in arcs |
| 409 | */ |
| 410 | static void |
| 411 | subrange(struct vars * v, |
| 412 | chr from, |
| 413 | chr to, |
| 414 | struct state * lp, |
| 415 | struct state * rp) |
| 416 | { |
| 417 | uchr uf; |
| 418 | int i; |
| 419 | |
| 420 | assert(from <= to); |
| 421 | |
| 422 | /* first, align "from" on a tree-block boundary */ |
| 423 | uf = (uchr) from; |
| 424 | i = (int) (((uf + BYTTAB - 1) & (uchr) ~BYTMASK) - uf); |
| 425 | for (; from <= to && i > 0; i--, from++) |
| 426 | newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp); |
| 427 | if (from > to) /* didn't reach a boundary */ |
| 428 | return; |
| 429 | |
| 430 | /* deal with whole blocks */ |
| 431 | for (; to - from >= BYTTAB; from += BYTTAB) |
| 432 | subblock(v, from, lp, rp); |
| 433 | |
| 434 | /* clean up any remaining partial table */ |
| 435 | for (; from <= to; from++) |
| 436 | newarc(v->nfa, PLAIN, subcolor(v->cm, from), lp, rp); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * subblock - allocate new subcolors for one tree block of chrs, fill in arcs |
| 441 | */ |
| 442 | static void |
| 443 | subblock(struct vars * v, |
| 444 | chr start, /* first of BYTTAB chrs */ |
| 445 | struct state * lp, |
| 446 | struct state * rp) |
| 447 | { |
| 448 | uchr uc = start; |
| 449 | struct colormap *cm = v->cm; |
| 450 | int shift; |
| 451 | int level; |
| 452 | int i; |
| 453 | int b; |
| 454 | union tree *t; |
| 455 | union tree *cb; |
| 456 | union tree *fillt; |
| 457 | union tree *lastt; |
| 458 | int previ; |
| 459 | int ndone; |
| 460 | color co; |
| 461 | color sco; |
| 462 | |
| 463 | assert((uc % BYTTAB) == 0); |
| 464 | |
| 465 | /* find its color block, making new pointer blocks as needed */ |
| 466 | t = cm->tree; |
| 467 | fillt = NULL; |
| 468 | for (level = 0, shift = BYTBITS * (NBYTS - 1); shift > 0; |
| 469 | level++, shift -= BYTBITS) |
| 470 | { |
| 471 | b = (uc >> shift) & BYTMASK; |
| 472 | lastt = t; |
| 473 | t = lastt->tptr[b]; |
| 474 | assert(t != NULL); |
| 475 | fillt = &cm->tree[level + 1]; |
| 476 | if (t == fillt && shift > BYTBITS) |
| 477 | { /* need new ptr block */ |
| 478 | t = (union tree *) MALLOC(sizeof(struct ptrs)); |
| 479 | if (t == NULL) |
| 480 | { |
| 481 | CERR(REG_ESPACE); |
| 482 | return; |
| 483 | } |
| 484 | memcpy(VS(t->tptr), VS(fillt->tptr), |
| 485 | BYTTAB * sizeof(union tree *)); |
| 486 | lastt->tptr[b] = t; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /* special cases: fill block or solid block */ |
| 491 | co = t->tcolor[0]; |
| 492 | cb = cm->cd[co].block; |
| 493 | if (t == fillt || t == cb) |
| 494 | { |
| 495 | /* either way, we want a subcolor solid block */ |
| 496 | sco = newsub(cm, co); |
| 497 | t = cm->cd[sco].block; |
| 498 | if (t == NULL) |
| 499 | { /* must set it up */ |
| 500 | t = (union tree *) MALLOC(sizeof(struct colors)); |
| 501 | if (t == NULL) |
| 502 | { |
| 503 | CERR(REG_ESPACE); |
| 504 | return; |
| 505 | } |
| 506 | for (i = 0; i < BYTTAB; i++) |
| 507 | t->tcolor[i] = sco; |
| 508 | cm->cd[sco].block = t; |
| 509 | } |
| 510 | /* find loop must have run at least once */ |
| 511 | lastt->tptr[b] = t; |
| 512 | newarc(v->nfa, PLAIN, sco, lp, rp); |
| 513 | cm->cd[co].nchrs -= BYTTAB; |
| 514 | cm->cd[sco].nchrs += BYTTAB; |
| 515 | return; |
| 516 | } |
| 517 | |
| 518 | /* general case, a mixed block to be altered */ |
| 519 | i = 0; |
| 520 | while (i < BYTTAB) |
| 521 | { |
| 522 | co = t->tcolor[i]; |
| 523 | sco = newsub(cm, co); |
| 524 | newarc(v->nfa, PLAIN, sco, lp, rp); |
| 525 | previ = i; |
| 526 | do |
| 527 | { |
| 528 | t->tcolor[i++] = sco; |
| 529 | } while (i < BYTTAB && t->tcolor[i] == co); |
| 530 | ndone = i - previ; |
| 531 | cm->cd[co].nchrs -= ndone; |
| 532 | cm->cd[sco].nchrs += ndone; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * okcolors - promote subcolors to full colors |
| 538 | */ |
| 539 | static void |
| 540 | okcolors(struct nfa * nfa, |
| 541 | struct colormap * cm) |
| 542 | { |
| 543 | struct colordesc *cd; |
| 544 | struct colordesc *end = CDEND(cm); |
| 545 | struct colordesc *scd; |
| 546 | struct arc *a; |
| 547 | color co; |
| 548 | color sco; |
| 549 | |
| 550 | for (cd = cm->cd, co = 0; cd < end; cd++, co++) |
| 551 | { |
| 552 | sco = cd->sub; |
| 553 | if (UNUSEDCOLOR(cd) || sco == NOSUB) |
| 554 | { |
| 555 | /* has no subcolor, no further action */ |
| 556 | } |
| 557 | else if (sco == co) |
| 558 | { |
| 559 | /* is subcolor, let parent deal with it */ |
| 560 | } |
| 561 | else if (cd->nchrs == 0) |
| 562 | { |
| 563 | /* parent empty, its arcs change color to subcolor */ |
| 564 | cd->sub = NOSUB; |
| 565 | scd = &cm->cd[sco]; |
| 566 | assert(scd->nchrs > 0); |
| 567 | assert(scd->sub == sco); |
| 568 | scd->sub = NOSUB; |
| 569 | while ((a = cd->arcs) != NULL) |
| 570 | { |
| 571 | assert(a->co == co); |
| 572 | /* uncolorchain(cm, a); */ |
| 573 | cd->arcs = a->colorchain; |
| 574 | a->co = sco; |
| 575 | /* colorchain(cm, a); */ |
| 576 | a->colorchain = scd->arcs; |
| 577 | scd->arcs = a; |
| 578 | } |
| 579 | freecolor(cm, co); |
| 580 | } |
| 581 | else |
| 582 | { |
| 583 | /* parent's arcs must gain parallel subcolor arcs */ |
| 584 | cd->sub = NOSUB; |
| 585 | scd = &cm->cd[sco]; |
| 586 | assert(scd->nchrs > 0); |
| 587 | assert(scd->sub == sco); |
| 588 | scd->sub = NOSUB; |
| 589 | for (a = cd->arcs; a != NULL; a = a->colorchain) |
| 590 | { |
| 591 | assert(a->co == co); |
| 592 | newarc(nfa, a->type, sco, a->from, a->to); |
| 593 | } |
| 594 | } |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * colorchain - add this arc to the color chain of its color |
| 600 | */ |
| 601 | static void |
| 602 | colorchain(struct colormap * cm, |
| 603 | struct arc * a) |
| 604 | { |
| 605 | struct colordesc *cd = &cm->cd[a->co]; |
| 606 | |
| 607 | a->colorchain = cd->arcs; |
| 608 | cd->arcs = a; |
| 609 | } |
| 610 | |
| 611 | /* |
| 612 | * uncolorchain - delete this arc from the color chain of its color |
| 613 | */ |
| 614 | static void |
| 615 | uncolorchain(struct colormap * cm, |
| 616 | struct arc * a) |
| 617 | { |
| 618 | struct colordesc *cd = &cm->cd[a->co]; |
| 619 | struct arc *aa; |
| 620 | |
| 621 | aa = cd->arcs; |
| 622 | if (aa == a) /* easy case */ |
| 623 | cd->arcs = a->colorchain; |
| 624 | else |
| 625 | { |
| 626 | for (; aa != NULL && aa->colorchain != a; aa = aa->colorchain) |
| 627 | continue; |
| 628 | assert(aa != NULL); |
| 629 | aa->colorchain = a->colorchain; |
| 630 | } |
| 631 | a->colorchain = NULL; /* paranoia */ |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * singleton - is this character in its own color? |
| 636 | */ |
| 637 | static int /* predicate */ |
| 638 | singleton(struct colormap * cm, |
| 639 | chr c) |
| 640 | { |
| 641 | color co; /* color of c */ |
| 642 | |
| 643 | co = GETCOLOR(cm, c); |
| 644 | if (cm->cd[co].nchrs == 1 && cm->cd[co].sub == NOSUB) |
| 645 | return 1; |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * rainbow - add arcs of all full colors (but one) between specified states |
| 651 | */ |
| 652 | static void |
| 653 | rainbow(struct nfa * nfa, |
| 654 | struct colormap * cm, |
| 655 | int type, |
| 656 | pcolor but, /* COLORLESS if no exceptions */ |
| 657 | struct state * from, |
| 658 | struct state * to) |
| 659 | { |
| 660 | struct colordesc *cd; |
| 661 | struct colordesc *end = CDEND(cm); |
| 662 | color co; |
| 663 | |
| 664 | for (cd = cm->cd, co = 0; cd < end && !CISERR(); cd++, co++) |
| 665 | if (!UNUSEDCOLOR(cd) && cd->sub != co && co != but && |
| 666 | !(cd->flags & PSEUDO)) |
| 667 | newarc(nfa, type, co, from, to); |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * colorcomplement - add arcs of complementary colors |
| 672 | * |
| 673 | * The calling sequence ought to be reconciled with cloneouts(). |
| 674 | */ |
| 675 | static void |
| 676 | colorcomplement(struct nfa * nfa, |
| 677 | struct colormap * cm, |
| 678 | int type, |
| 679 | struct state * of, /* complements of this guy's PLAIN |
| 680 | * outarcs */ |
| 681 | struct state * from, |
| 682 | struct state * to) |
| 683 | { |
| 684 | struct colordesc *cd; |
| 685 | struct colordesc *end = CDEND(cm); |
| 686 | color co; |
| 687 | |
| 688 | assert(of != from); |
| 689 | for (cd = cm->cd, co = 0; cd < end && !CISERR(); cd++, co++) |
| 690 | if (!UNUSEDCOLOR(cd) && !(cd->flags & PSEUDO)) |
| 691 | if (findarc(of, PLAIN, co) == NULL) |
| 692 | newarc(nfa, type, co, from, to); |
| 693 | } |
| 694 | |
| 695 | |
| 696 | #ifdef REG_DEBUG |
| 697 | |
| 698 | /* |
| 699 | * dumpcolors - debugging output |
| 700 | */ |
| 701 | static void |
| 702 | dumpcolors(struct colormap * cm, |
| 703 | FILE *f) |
| 704 | { |
| 705 | struct colordesc *cd; |
| 706 | struct colordesc *end; |
| 707 | color co; |
| 708 | chr c; |
| 709 | char *has; |
| 710 | |
| 711 | fprintf(f, "max %ld\n", (long) cm->max); |
| 712 | if (NBYTS > 1) |
| 713 | fillcheck(cm, cm->tree, 0, f); |
| 714 | end = CDEND(cm); |
| 715 | for (cd = cm->cd + 1, co = 1; cd < end; cd++, co++) /* skip 0 */ |
| 716 | if (!UNUSEDCOLOR(cd)) |
| 717 | { |
| 718 | assert(cd->nchrs > 0); |
| 719 | has = (cd->block != NULL) ? "#" : ""; |
| 720 | if (cd->flags & PSEUDO) |
| 721 | fprintf(f, "#%2ld%s(ps): ", (long) co, has); |
| 722 | else |
| 723 | fprintf(f, "#%2ld%s(%2d): ", (long) co, |
| 724 | has, cd->nchrs); |
| 725 | /* it's hard to do this more efficiently */ |
| 726 | for (c = CHR_MIN; c < CHR_MAX; c++) |
| 727 | if (GETCOLOR(cm, c) == co) |
| 728 | dumpchr(c, f); |
| 729 | assert(c == CHR_MAX); |
| 730 | if (GETCOLOR(cm, c) == co) |
| 731 | dumpchr(c, f); |
| 732 | fprintf(f, "\n"); |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * fillcheck - check proper filling of a tree |
| 738 | */ |
| 739 | static void |
| 740 | fillcheck(struct colormap * cm, |
| 741 | union tree * tree, |
| 742 | int level, /* level number (top == 0) of this block */ |
| 743 | FILE *f) |
| 744 | { |
| 745 | int i; |
| 746 | union tree *t; |
| 747 | union tree *fillt = &cm->tree[level + 1]; |
| 748 | |
| 749 | assert(level < NBYTS - 1); /* this level has pointers */ |
| 750 | for (i = BYTTAB - 1; i >= 0; i--) |
| 751 | { |
| 752 | t = tree->tptr[i]; |
| 753 | if (t == NULL) |
| 754 | fprintf(f, "NULL found in filled tree!\n"); |
| 755 | else if (t == fillt) |
| 756 | { |
| 757 | } |
| 758 | else if (level < NBYTS - 2) /* more pointer blocks below */ |
| 759 | fillcheck(cm, t, level + 1, f); |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | /* |
| 764 | * dumpchr - print a chr |
| 765 | * |
| 766 | * Kind of char-centric but works well enough for debug use. |
| 767 | */ |
| 768 | static void |
| 769 | dumpchr(chr c, |
| 770 | FILE *f) |
| 771 | { |
| 772 | if (c == '\\') |
| 773 | fprintf(f, "\\\\"); |
| 774 | else if (c > ' ' && c <= '~') |
| 775 | putc((char) c, f); |
| 776 | else |
| 777 | fprintf(f, "\\u%04lx", (long) c); |
| 778 | } |
| 779 | |
| 780 | #endif /* REG_DEBUG */ |