[13657] | 1 |
|
---|
[3745] | 2 | /* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
|
---|
| 3 |
|
---|
| 4 | This file is part of the librx library.
|
---|
| 5 |
|
---|
| 6 | Librx is free software; you can redistribute it and/or modify it under
|
---|
| 7 | the terms of the GNU Library General Public License as published by
|
---|
| 8 | the Free Software Foundation; either version 2, or (at your option)
|
---|
| 9 | any later version.
|
---|
| 10 |
|
---|
| 11 | Librx is distributed in the hope that it will be useful, but WITHOUT
|
---|
| 12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
---|
| 13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
---|
| 14 | for more details.
|
---|
| 15 |
|
---|
| 16 | You should have received a copy of the GNU Library General Public
|
---|
| 17 | License along with this software; see the file COPYING.LIB. If not,
|
---|
| 18 | write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA
|
---|
| 19 | 02139, USA. */
|
---|
| 20 |
|
---|
| 21 | /* NOTE!!! AIX is so losing it requires this to be the first thing in the
|
---|
| 22 | * file.
|
---|
| 23 | * Do not put ANYTHING before it!
|
---|
| 24 | */
|
---|
| 25 | #if !defined (__GNUC__) && defined (_AIX)
|
---|
| 26 | #pragma alloca
|
---|
| 27 | #endif
|
---|
| 28 |
|
---|
| 29 | /* To make linux happy? */
|
---|
| 30 | #ifndef _GNU_SOURCE
|
---|
| 31 | #define _GNU_SOURCE
|
---|
| 32 | #endif
|
---|
| 33 |
|
---|
| 34 | #if HAVE_CONFIG_H
|
---|
| 35 | # ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 36 | # include <win32cfg.h>
|
---|
| 37 | # include <malloc.h>
|
---|
| 38 | # else
|
---|
| 39 | # include <sysfuncs.h>
|
---|
| 40 | # endif
|
---|
| 41 | #endif
|
---|
| 42 |
|
---|
| 43 | |
---|
| 44 |
|
---|
| 45 | char rx_version_string[] = "GNU Rx version 0.07.1";
|
---|
| 46 |
|
---|
| 47 | /* ``Too hard!''
|
---|
| 48 | * -- anon.
|
---|
| 49 | */
|
---|
| 50 |
|
---|
| 51 | |
---|
| 52 |
|
---|
| 53 | #include <stdio.h>
|
---|
| 54 | #include <ctype.h>
|
---|
| 55 | #ifndef isgraph
|
---|
| 56 | #define isgraph(c) (isprint (c) && !isspace (c))
|
---|
| 57 | #endif
|
---|
| 58 | #ifndef isblank
|
---|
| 59 | #define isblank(c) ((c) == ' ' || (c) == '\t')
|
---|
| 60 | #endif
|
---|
| 61 |
|
---|
| 62 | #include <sys/types.h>
|
---|
| 63 |
|
---|
| 64 | #undef MAX
|
---|
| 65 | #undef MIN
|
---|
| 66 | #define MAX(a, b) ((a) > (b) ? (a) : (b))
|
---|
| 67 | #define MIN(a, b) ((a) < (b) ? (a) : (b))
|
---|
| 68 |
|
---|
| 69 | typedef char boolean;
|
---|
| 70 | #define false 0
|
---|
| 71 | #define true 1
|
---|
| 72 |
|
---|
| 73 | #ifndef __GCC__
|
---|
| 74 | #undef __inline__
|
---|
| 75 | #define __inline__
|
---|
| 76 | #endif
|
---|
| 77 |
|
---|
| 78 | /* Emacs already defines alloca, sometimes. */
|
---|
| 79 | #ifndef alloca
|
---|
| 80 |
|
---|
| 81 | /* Make alloca work the best possible way. */
|
---|
| 82 | #ifdef __GNUC__
|
---|
| 83 | #define alloca __builtin_alloca
|
---|
| 84 | #else /* not __GNUC__ */
|
---|
| 85 | #if HAVE_ALLOCA_H
|
---|
| 86 | #include <alloca.h>
|
---|
| 87 | #else /* not __GNUC__ or HAVE_ALLOCA_H */
|
---|
| 88 | #ifndef _AIX /* Already did AIX, up at the top. */
|
---|
| 89 | char *alloca ();
|
---|
| 90 | #endif /* not _AIX */
|
---|
| 91 | #endif /* not HAVE_ALLOCA_H */
|
---|
| 92 | #endif /* not __GNUC__ */
|
---|
| 93 |
|
---|
| 94 | #endif /* not alloca */
|
---|
| 95 |
|
---|
| 96 | /* Memory management and stuff for emacs. */
|
---|
| 97 |
|
---|
| 98 | #define CHARBITS 8
|
---|
| 99 | #define remalloc(M, S) (M ? realloc (M, S) : malloc (S))
|
---|
| 100 |
|
---|
| 101 |
|
---|
| 102 | /* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we
|
---|
| 103 | * use `alloca' instead of `malloc' for the backtracking stack.
|
---|
| 104 | *
|
---|
| 105 | * Emacs will die miserably if we don't do this.
|
---|
| 106 | */
|
---|
| 107 |
|
---|
| 108 | #ifdef REGEX_MALLOC
|
---|
| 109 | #define REGEX_ALLOCATE malloc
|
---|
| 110 | #else /* not REGEX_MALLOC */
|
---|
| 111 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 112 | #define REGEX_ALLOCATE _alloca
|
---|
| 113 | #else
|
---|
| 114 | #define REGEX_ALLOCATE alloca
|
---|
| 115 | #endif /* __WIN32__ */
|
---|
| 116 | #endif /* not REGEX_MALLOC */
|
---|
| 117 |
|
---|
| 118 |
|
---|
| 119 | #ifdef RX_WANT_RX_DEFS
|
---|
| 120 | #define RX_DECL extern
|
---|
| 121 | #define RX_DEF_QUAL
|
---|
| 122 | #else
|
---|
| 123 | #define RX_WANT_RX_DEFS
|
---|
| 124 | #define RX_DECL static
|
---|
| 125 | #define RX_DEF_QUAL static
|
---|
| 126 | #endif
|
---|
| 127 | #include "rx.h"
|
---|
| 128 | #undef RX_DECL
|
---|
| 129 | #define RX_DECL RX_DEF_QUAL
|
---|
| 130 |
|
---|
| 131 |
|
---|
| 132 | #ifndef emacs
|
---|
| 133 |
|
---|
| 134 | #ifdef SYNTAX_TABLE
|
---|
| 135 | extern char *re_syntax_table;
|
---|
| 136 | #else /* not SYNTAX_TABLE */
|
---|
| 137 |
|
---|
| 138 | #ifdef __STDC__
|
---|
| 139 | static void
|
---|
| 140 | init_syntax_once (void)
|
---|
| 141 | #else
|
---|
| 142 | static void
|
---|
| 143 | init_syntax_once ()
|
---|
| 144 | #endif
|
---|
| 145 | {
|
---|
| 146 | register int c;
|
---|
| 147 | static int done = 0;
|
---|
| 148 |
|
---|
| 149 | if (done)
|
---|
| 150 | return;
|
---|
| 151 |
|
---|
| 152 | bzero (re_syntax_table, sizeof re_syntax_table);
|
---|
| 153 |
|
---|
| 154 | for (c = 'a'; c <= 'z'; c++)
|
---|
| 155 | re_syntax_table[c] = Sword;
|
---|
| 156 |
|
---|
| 157 | for (c = 'A'; c <= 'Z'; c++)
|
---|
| 158 | re_syntax_table[c] = Sword;
|
---|
| 159 |
|
---|
| 160 | for (c = '0'; c <= '9'; c++)
|
---|
| 161 | re_syntax_table[c] = Sword;
|
---|
| 162 |
|
---|
| 163 | re_syntax_table['_'] = Sword;
|
---|
| 164 |
|
---|
| 165 | done = 1;
|
---|
| 166 | }
|
---|
| 167 | #endif /* not SYNTAX_TABLE */
|
---|
| 168 | #endif /* not emacs */
|
---|
| 169 | |
---|
| 170 |
|
---|
| 171 | /* Compile with `-DRX_DEBUG' and use the following flags.
|
---|
| 172 | *
|
---|
| 173 | * Debugging flags:
|
---|
| 174 | * rx_debug - print information as a regexp is compiled
|
---|
| 175 | * rx_debug_trace - print information as a regexp is executed
|
---|
| 176 | */
|
---|
| 177 |
|
---|
| 178 | #ifdef RX_DEBUG
|
---|
| 179 |
|
---|
| 180 | int rx_debug_compile = 0;
|
---|
| 181 | int rx_debug_trace = 0;
|
---|
| 182 | static struct re_pattern_buffer * dbug_rxb = 0;
|
---|
| 183 |
|
---|
| 184 | #ifdef __STDC__
|
---|
| 185 | typedef void (*side_effect_printer) (struct rx *, void *, FILE *);
|
---|
| 186 | #else
|
---|
| 187 | typedef void (*side_effect_printer) ();
|
---|
| 188 | #endif
|
---|
| 189 |
|
---|
| 190 | #ifdef __STDC__
|
---|
| 191 | static void print_cset (struct rx *rx, rx_Bitset cset, FILE * fp);
|
---|
| 192 | #else
|
---|
| 193 | static void print_cset ();
|
---|
| 194 | #endif
|
---|
| 195 |
|
---|
| 196 | #ifdef __STDC__
|
---|
| 197 | static void
|
---|
| 198 | print_rexp (struct rx *rx,
|
---|
| 199 | struct rexp_node *node, int depth,
|
---|
| 200 | side_effect_printer seprint, FILE * fp)
|
---|
| 201 | #else
|
---|
| 202 | static void
|
---|
| 203 | print_rexp (rx, node, depth, seprint, fp)
|
---|
| 204 | struct rx *rx;
|
---|
| 205 | struct rexp_node *node;
|
---|
| 206 | int depth;
|
---|
| 207 | side_effect_printer seprint;
|
---|
| 208 | FILE * fp;
|
---|
| 209 | #endif
|
---|
| 210 | {
|
---|
| 211 | if (!node)
|
---|
| 212 | return;
|
---|
| 213 | else
|
---|
| 214 | {
|
---|
| 215 | switch (node->type)
|
---|
| 216 | {
|
---|
| 217 | case r_cset:
|
---|
| 218 | {
|
---|
| 219 | fprintf (fp, "%*s", depth, "");
|
---|
| 220 | print_cset (rx, node->params.cset, fp);
|
---|
| 221 | fputc ('\n', fp);
|
---|
| 222 | break;
|
---|
| 223 | }
|
---|
| 224 |
|
---|
| 225 | case r_opt:
|
---|
| 226 | case r_star:
|
---|
| 227 | fprintf (fp, "%*s%s\n", depth, "",
|
---|
| 228 | node->type == r_opt ? "opt" : "star");
|
---|
| 229 | print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
|
---|
| 230 | break;
|
---|
| 231 |
|
---|
| 232 | case r_2phase_star:
|
---|
| 233 | fprintf (fp, "%*s2phase star\n", depth, "");
|
---|
| 234 | print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp);
|
---|
| 235 | print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
|
---|
| 236 | break;
|
---|
| 237 |
|
---|
| 238 |
|
---|
| 239 | case r_alternate:
|
---|
| 240 | case r_concat:
|
---|
| 241 | fprintf (fp, "%*s%s\n", depth, "",
|
---|
| 242 | node->type == r_alternate ? "alt" : "concat");
|
---|
| 243 | print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
|
---|
| 244 | print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp);
|
---|
| 245 | break;
|
---|
| 246 | case r_side_effect:
|
---|
| 247 | fprintf (fp, "%*sSide effect: ", depth, "");
|
---|
| 248 | seprint (rx, node->params.side_effect, fp);
|
---|
| 249 | fputc ('\n', fp);
|
---|
| 250 | }
|
---|
| 251 | }
|
---|
| 252 | }
|
---|
| 253 |
|
---|
| 254 | #ifdef __STDC__
|
---|
| 255 | static void
|
---|
| 256 | print_nfa (struct rx * rx,
|
---|
| 257 | struct rx_nfa_state * n,
|
---|
| 258 | side_effect_printer seprint, FILE * fp)
|
---|
| 259 | #else
|
---|
| 260 | static void
|
---|
| 261 | print_nfa (rx, n, seprint, fp)
|
---|
| 262 | struct rx * rx;
|
---|
| 263 | struct rx_nfa_state * n;
|
---|
| 264 | side_effect_printer seprint;
|
---|
| 265 | FILE * fp;
|
---|
| 266 | #endif
|
---|
| 267 | {
|
---|
| 268 | while (n)
|
---|
| 269 | {
|
---|
| 270 | struct rx_nfa_edge *e = n->edges;
|
---|
| 271 | struct rx_possible_future *ec = n->futures;
|
---|
| 272 | fprintf (fp, "node %d %s\n", n->id,
|
---|
| 273 | n->is_final ? "final" : (n->is_start ? "start" : ""));
|
---|
| 274 | while (e)
|
---|
| 275 | {
|
---|
| 276 | fprintf (fp, " edge to %d, ", e->dest->id);
|
---|
| 277 | switch (e->type)
|
---|
| 278 | {
|
---|
| 279 | case ne_epsilon:
|
---|
| 280 | fprintf (fp, "epsilon\n");
|
---|
| 281 | break;
|
---|
| 282 | case ne_side_effect:
|
---|
| 283 | fprintf (fp, "side effect ");
|
---|
| 284 | seprint (rx, e->params.side_effect, fp);
|
---|
| 285 | fputc ('\n', fp);
|
---|
| 286 | break;
|
---|
| 287 | case ne_cset:
|
---|
| 288 | fprintf (fp, "cset ");
|
---|
| 289 | print_cset (rx, e->params.cset, fp);
|
---|
| 290 | fputc ('\n', fp);
|
---|
| 291 | break;
|
---|
| 292 | }
|
---|
| 293 | e = e->next;
|
---|
| 294 | }
|
---|
| 295 |
|
---|
| 296 | while (ec)
|
---|
| 297 | {
|
---|
| 298 | int x;
|
---|
| 299 | struct rx_nfa_state_set * s;
|
---|
| 300 | struct rx_se_list * l;
|
---|
| 301 | fprintf (fp, " eclosure to {");
|
---|
| 302 | for (s = ec->destset; s; s = s->cdr)
|
---|
| 303 | fprintf (fp, "%d ", s->car->id);
|
---|
| 304 | fprintf (fp, "} (");
|
---|
| 305 | for (l = ec->effects; l; l = l->cdr)
|
---|
| 306 | {
|
---|
| 307 | seprint (rx, l->car, fp);
|
---|
| 308 | fputc (' ', fp);
|
---|
| 309 | }
|
---|
| 310 | fprintf (fp, ")\n");
|
---|
| 311 | ec = ec->next;
|
---|
| 312 | }
|
---|
| 313 | n = n->next;
|
---|
| 314 | }
|
---|
| 315 | }
|
---|
| 316 |
|
---|
| 317 | static char * efnames [] =
|
---|
| 318 | {
|
---|
| 319 | "bogon",
|
---|
| 320 | "re_se_try",
|
---|
| 321 | "re_se_pushback",
|
---|
| 322 | "re_se_push0",
|
---|
| 323 | "re_se_pushpos",
|
---|
| 324 | "re_se_chkpos",
|
---|
| 325 | "re_se_poppos",
|
---|
| 326 | "re_se_at_dot",
|
---|
| 327 | "re_se_syntax",
|
---|
| 328 | "re_se_not_syntax",
|
---|
| 329 | "re_se_begbuf",
|
---|
| 330 | "re_se_hat",
|
---|
| 331 | "re_se_wordbeg",
|
---|
| 332 | "re_se_wordbound",
|
---|
| 333 | "re_se_notwordbound",
|
---|
| 334 | "re_se_wordend",
|
---|
| 335 | "re_se_endbuf",
|
---|
| 336 | "re_se_dollar",
|
---|
| 337 | "re_se_fail",
|
---|
| 338 | };
|
---|
| 339 |
|
---|
| 340 | static char * efnames2[] =
|
---|
| 341 | {
|
---|
| 342 | "re_se_win",
|
---|
| 343 | "re_se_lparen",
|
---|
| 344 | "re_se_rparen",
|
---|
| 345 | "re_se_backref",
|
---|
| 346 | "re_se_iter",
|
---|
| 347 | "re_se_end_iter",
|
---|
| 348 | "re_se_tv"
|
---|
| 349 | };
|
---|
| 350 |
|
---|
| 351 | static char * inx_names[] =
|
---|
| 352 | {
|
---|
| 353 | "rx_backtrack_point",
|
---|
| 354 | "rx_do_side_effects",
|
---|
| 355 | "rx_cache_miss",
|
---|
| 356 | "rx_next_char",
|
---|
| 357 | "rx_backtrack",
|
---|
| 358 | "rx_error_inx",
|
---|
| 359 | "rx_num_instructions"
|
---|
| 360 | };
|
---|
| 361 |
|
---|
| 362 |
|
---|
| 363 | #ifdef __STDC__
|
---|
| 364 | static void
|
---|
| 365 | re_seprint (struct rx * rx, void * effect, FILE * fp)
|
---|
| 366 | #else
|
---|
| 367 | static void
|
---|
| 368 | re_seprint (rx, effect, fp)
|
---|
| 369 | struct rx * rx;
|
---|
| 370 | void * effect;
|
---|
| 371 | FILE * fp;
|
---|
| 372 | #endif
|
---|
| 373 | {
|
---|
| 374 | if ((int)effect < 0)
|
---|
| 375 | fputs (efnames[-(int)effect], fp);
|
---|
| 376 | else if (dbug_rxb)
|
---|
| 377 | {
|
---|
| 378 | struct re_se_params * p = &dbug_rxb->se_params[(int)effect];
|
---|
| 379 | fprintf (fp, "%s(%d,%d)", efnames2[p->se], p->op1, p->op2);
|
---|
| 380 | }
|
---|
| 381 | else
|
---|
| 382 | fprintf (fp, "[complex op # %d]", (int)effect);
|
---|
| 383 | }
|
---|
| 384 |
|
---|
| 385 |
|
---|
| 386 | /* These are so the regex.c regression tests will compile. */
|
---|
| 387 | void
|
---|
| 388 | print_compiled_pattern (rxb)
|
---|
| 389 | struct re_pattern_buffer * rxb;
|
---|
| 390 | {
|
---|
| 391 | }
|
---|
| 392 |
|
---|
| 393 | void
|
---|
| 394 | print_fastmap (fm)
|
---|
| 395 | char * fm;
|
---|
| 396 | {
|
---|
| 397 | }
|
---|
| 398 |
|
---|
| 399 | #endif /* RX_DEBUG */
|
---|
| 400 |
|
---|
| 401 | |
---|
| 402 |
|
---|
| 403 |
|
---|
| 404 | /* This page: Bitsets. Completely unintersting. */
|
---|
| 405 |
|
---|
| 406 | #ifdef __STDC__
|
---|
| 407 | RX_DECL int
|
---|
| 408 | rx_bitset_is_equal (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 409 | #else
|
---|
| 410 | RX_DECL int
|
---|
| 411 | rx_bitset_is_equal (size, a, b)
|
---|
| 412 | int size;
|
---|
| 413 | rx_Bitset a;
|
---|
| 414 | rx_Bitset b;
|
---|
| 415 | #endif
|
---|
| 416 | {
|
---|
| 417 | int x;
|
---|
| 418 | RX_subset s = b[0];
|
---|
| 419 | b[0] = ~a[0];
|
---|
| 420 |
|
---|
| 421 | for (x = rx_bitset_numb_subsets(size) - 1; a[x] == b[x]; --x)
|
---|
| 422 | ;
|
---|
| 423 |
|
---|
| 424 | b[0] = s;
|
---|
| 425 | return !x && s == a[0];
|
---|
| 426 | }
|
---|
| 427 |
|
---|
| 428 | #ifdef __STDC__
|
---|
| 429 | RX_DECL int
|
---|
| 430 | rx_bitset_is_subset (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 431 | #else
|
---|
| 432 | RX_DECL int
|
---|
| 433 | rx_bitset_is_subset (size, a, b)
|
---|
| 434 | int size;
|
---|
| 435 | rx_Bitset a;
|
---|
| 436 | rx_Bitset b;
|
---|
| 437 | #endif
|
---|
| 438 | {
|
---|
| 439 | int x = rx_bitset_numb_subsets(size) - 1;
|
---|
| 440 | while (x-- && (a[x] & b[x]) == a[x]);
|
---|
| 441 | return x == -1;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 |
|
---|
| 445 | #ifdef __STDC__
|
---|
| 446 | RX_DECL int
|
---|
| 447 | rx_bitset_empty (int size, rx_Bitset set)
|
---|
| 448 | #else
|
---|
| 449 | RX_DECL int
|
---|
| 450 | rx_bitset_empty (size, set)
|
---|
| 451 | int size;
|
---|
| 452 | rx_Bitset set;
|
---|
| 453 | #endif
|
---|
| 454 | {
|
---|
| 455 | int x;
|
---|
| 456 | RX_subset s = set[0];
|
---|
| 457 | set[0] = 1;
|
---|
| 458 | for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x)
|
---|
| 459 | ;
|
---|
| 460 | set[0] = s;
|
---|
| 461 | return !s;
|
---|
| 462 | }
|
---|
| 463 |
|
---|
| 464 | #ifdef __STDC__
|
---|
| 465 | RX_DECL void
|
---|
| 466 | rx_bitset_null (int size, rx_Bitset b)
|
---|
| 467 | #else
|
---|
| 468 | RX_DECL void
|
---|
| 469 | rx_bitset_null (size, b)
|
---|
| 470 | int size;
|
---|
| 471 | rx_Bitset b;
|
---|
| 472 | #endif
|
---|
| 473 | {
|
---|
| 474 | bzero (b, rx_sizeof_bitset(size));
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 |
|
---|
| 478 | #ifdef __STDC__
|
---|
| 479 | RX_DECL void
|
---|
| 480 | rx_bitset_universe (int size, rx_Bitset b)
|
---|
| 481 | #else
|
---|
| 482 | RX_DECL void
|
---|
| 483 | rx_bitset_universe (size, b)
|
---|
| 484 | int size;
|
---|
| 485 | rx_Bitset b;
|
---|
| 486 | #endif
|
---|
| 487 | {
|
---|
| 488 | int x = rx_bitset_numb_subsets (size);
|
---|
| 489 | while (x--)
|
---|
| 490 | *b++ = ~(RX_subset)0;
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 |
|
---|
| 494 | #ifdef __STDC__
|
---|
| 495 | RX_DECL void
|
---|
| 496 | rx_bitset_complement (int size, rx_Bitset b)
|
---|
| 497 | #else
|
---|
| 498 | RX_DECL void
|
---|
| 499 | rx_bitset_complement (size, b)
|
---|
| 500 | int size;
|
---|
| 501 | rx_Bitset b;
|
---|
| 502 | #endif
|
---|
| 503 | {
|
---|
| 504 | int x = rx_bitset_numb_subsets (size);
|
---|
| 505 | while (x--)
|
---|
| 506 | {
|
---|
| 507 | *b = ~*b;
|
---|
| 508 | ++b;
|
---|
| 509 | }
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 |
|
---|
| 513 | #ifdef __STDC__
|
---|
| 514 | RX_DECL void
|
---|
| 515 | rx_bitset_assign (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 516 | #else
|
---|
| 517 | RX_DECL void
|
---|
| 518 | rx_bitset_assign (size, a, b)
|
---|
| 519 | int size;
|
---|
| 520 | rx_Bitset a;
|
---|
| 521 | rx_Bitset b;
|
---|
| 522 | #endif
|
---|
| 523 | {
|
---|
| 524 | int x;
|
---|
| 525 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 526 | a[x] = b[x];
|
---|
| 527 | }
|
---|
| 528 |
|
---|
| 529 |
|
---|
| 530 | #ifdef __STDC__
|
---|
| 531 | RX_DECL void
|
---|
| 532 | rx_bitset_union (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 533 | #else
|
---|
| 534 | RX_DECL void
|
---|
| 535 | rx_bitset_union (size, a, b)
|
---|
| 536 | int size;
|
---|
| 537 | rx_Bitset a;
|
---|
| 538 | rx_Bitset b;
|
---|
| 539 | #endif
|
---|
| 540 | {
|
---|
| 541 | int x;
|
---|
| 542 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 543 | a[x] |= b[x];
|
---|
| 544 | }
|
---|
| 545 |
|
---|
| 546 |
|
---|
| 547 | #ifdef __STDC__
|
---|
| 548 | RX_DECL void
|
---|
| 549 | rx_bitset_intersection (int size,
|
---|
| 550 | rx_Bitset a, rx_Bitset b)
|
---|
| 551 | #else
|
---|
| 552 | RX_DECL void
|
---|
| 553 | rx_bitset_intersection (size, a, b)
|
---|
| 554 | int size;
|
---|
| 555 | rx_Bitset a;
|
---|
| 556 | rx_Bitset b;
|
---|
| 557 | #endif
|
---|
| 558 | {
|
---|
| 559 | int x;
|
---|
| 560 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 561 | a[x] &= b[x];
|
---|
| 562 | }
|
---|
| 563 |
|
---|
| 564 |
|
---|
| 565 | #ifdef __STDC__
|
---|
| 566 | RX_DECL void
|
---|
| 567 | rx_bitset_difference (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 568 | #else
|
---|
| 569 | RX_DECL void
|
---|
| 570 | rx_bitset_difference (size, a, b)
|
---|
| 571 | int size;
|
---|
| 572 | rx_Bitset a;
|
---|
| 573 | rx_Bitset b;
|
---|
| 574 | #endif
|
---|
| 575 | {
|
---|
| 576 | int x;
|
---|
| 577 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 578 | a[x] &= ~ b[x];
|
---|
| 579 | }
|
---|
| 580 |
|
---|
| 581 |
|
---|
| 582 | #ifdef __STDC__
|
---|
| 583 | RX_DECL void
|
---|
| 584 | rx_bitset_revdifference (int size,
|
---|
| 585 | rx_Bitset a, rx_Bitset b)
|
---|
| 586 | #else
|
---|
| 587 | RX_DECL void
|
---|
| 588 | rx_bitset_revdifference (size, a, b)
|
---|
| 589 | int size;
|
---|
| 590 | rx_Bitset a;
|
---|
| 591 | rx_Bitset b;
|
---|
| 592 | #endif
|
---|
| 593 | {
|
---|
| 594 | int x;
|
---|
| 595 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 596 | a[x] = ~a[x] & b[x];
|
---|
| 597 | }
|
---|
| 598 |
|
---|
| 599 | #ifdef __STDC__
|
---|
| 600 | RX_DECL void
|
---|
| 601 | rx_bitset_xor (int size, rx_Bitset a, rx_Bitset b)
|
---|
| 602 | #else
|
---|
| 603 | RX_DECL void
|
---|
| 604 | rx_bitset_xor (size, a, b)
|
---|
| 605 | int size;
|
---|
| 606 | rx_Bitset a;
|
---|
| 607 | rx_Bitset b;
|
---|
| 608 | #endif
|
---|
| 609 | {
|
---|
| 610 | int x;
|
---|
| 611 | for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
|
---|
| 612 | a[x] ^= b[x];
|
---|
| 613 | }
|
---|
| 614 |
|
---|
| 615 |
|
---|
| 616 | #ifdef __STDC__
|
---|
| 617 | RX_DECL unsigned long
|
---|
| 618 | rx_bitset_hash (int size, rx_Bitset b)
|
---|
| 619 | #else
|
---|
| 620 | RX_DECL unsigned long
|
---|
| 621 | rx_bitset_hash (size, b)
|
---|
| 622 | int size;
|
---|
| 623 | rx_Bitset b;
|
---|
| 624 | #endif
|
---|
| 625 | {
|
---|
| 626 | int x;
|
---|
| 627 | unsigned long hash = (unsigned long)rx_bitset_hash;
|
---|
| 628 |
|
---|
| 629 | for (x = rx_bitset_numb_subsets(size) - 1; x >= 0; --x)
|
---|
| 630 | hash ^= rx_bitset_subset_val(b, x);
|
---|
| 631 |
|
---|
| 632 | return hash;
|
---|
| 633 | }
|
---|
| 634 |
|
---|
| 635 |
|
---|
| 636 | RX_DECL RX_subset rx_subset_singletons [RX_subset_bits] =
|
---|
| 637 | {
|
---|
| 638 | 0x1,
|
---|
| 639 | 0x2,
|
---|
| 640 | 0x4,
|
---|
| 641 | 0x8,
|
---|
| 642 | 0x10,
|
---|
| 643 | 0x20,
|
---|
| 644 | 0x40,
|
---|
| 645 | 0x80,
|
---|
| 646 | 0x100,
|
---|
| 647 | 0x200,
|
---|
| 648 | 0x400,
|
---|
| 649 | 0x800,
|
---|
| 650 | 0x1000,
|
---|
| 651 | 0x2000,
|
---|
| 652 | 0x4000,
|
---|
| 653 | 0x8000,
|
---|
| 654 | 0x10000,
|
---|
| 655 | 0x20000,
|
---|
| 656 | 0x40000,
|
---|
| 657 | 0x80000,
|
---|
| 658 | 0x100000,
|
---|
| 659 | 0x200000,
|
---|
| 660 | 0x400000,
|
---|
| 661 | 0x800000,
|
---|
| 662 | 0x1000000,
|
---|
| 663 | 0x2000000,
|
---|
| 664 | 0x4000000,
|
---|
| 665 | 0x8000000,
|
---|
| 666 | 0x10000000,
|
---|
| 667 | 0x20000000,
|
---|
| 668 | 0x40000000,
|
---|
| 669 | 0x80000000
|
---|
| 670 | };
|
---|
| 671 |
|
---|
| 672 | #ifdef RX_DEBUG
|
---|
| 673 |
|
---|
| 674 | #ifdef __STDC__
|
---|
| 675 | static void
|
---|
| 676 | print_cset (struct rx *rx, rx_Bitset cset, FILE * fp)
|
---|
| 677 | #else
|
---|
| 678 | static void
|
---|
| 679 | print_cset (rx, cset, fp)
|
---|
| 680 | struct rx *rx;
|
---|
| 681 | rx_Bitset cset;
|
---|
| 682 | FILE * fp;
|
---|
| 683 | #endif
|
---|
| 684 | {
|
---|
| 685 | int x;
|
---|
| 686 | fputc ('[', fp);
|
---|
| 687 | for (x = 0; x < rx->local_cset_size; ++x)
|
---|
| 688 | if (RX_bitset_member (cset, x))
|
---|
| 689 | {
|
---|
| 690 | if (isprint(x))
|
---|
| 691 | fputc (x, fp);
|
---|
| 692 | else
|
---|
| 693 | fprintf (fp, "\\0%o ", x);
|
---|
| 694 | }
|
---|
| 695 | fputc (']', fp);
|
---|
| 696 | }
|
---|
| 697 |
|
---|
| 698 | #endif /* RX_DEBUG */
|
---|
| 699 |
|
---|
| 700 | |
---|
| 701 |
|
---|
| 702 |
|
---|
| 703 | static unsigned long rx_hash_masks[4] =
|
---|
| 704 | {
|
---|
| 705 | 0x12488421,
|
---|
| 706 | 0x96699669,
|
---|
| 707 | 0xbe7dd7eb,
|
---|
| 708 | 0xffffffff
|
---|
| 709 | };
|
---|
| 710 |
|
---|
| 711 |
|
---|
| 712 | /* Hash tables */
|
---|
| 713 | #ifdef __STDC__
|
---|
| 714 | RX_DECL struct rx_hash_item *
|
---|
| 715 | rx_hash_find (struct rx_hash * table,
|
---|
| 716 | unsigned long hash,
|
---|
| 717 | void * value,
|
---|
| 718 | struct rx_hash_rules * rules)
|
---|
| 719 | #else
|
---|
| 720 | RX_DECL struct rx_hash_item *
|
---|
| 721 | rx_hash_find (table, hash, value, rules)
|
---|
| 722 | struct rx_hash * table;
|
---|
| 723 | unsigned long hash;
|
---|
| 724 | void * value;
|
---|
| 725 | struct rx_hash_rules * rules;
|
---|
| 726 | #endif
|
---|
| 727 | {
|
---|
| 728 | rx_hash_eq eq = rules->eq;
|
---|
| 729 | int maskc = 0;
|
---|
| 730 | long mask = rx_hash_masks [0];
|
---|
| 731 | int bucket = (hash & mask) % 13;
|
---|
| 732 |
|
---|
| 733 | while (table->children [bucket])
|
---|
| 734 | {
|
---|
| 735 | table = table->children [bucket];
|
---|
| 736 | ++maskc;
|
---|
| 737 | mask = rx_hash_masks[maskc];
|
---|
| 738 | bucket = (hash & mask) % 13;
|
---|
| 739 | }
|
---|
| 740 |
|
---|
| 741 | {
|
---|
| 742 | struct rx_hash_item * it = table->buckets[bucket];
|
---|
| 743 | while (it)
|
---|
| 744 | if (eq (it->data, value))
|
---|
| 745 | return it;
|
---|
| 746 | else
|
---|
| 747 | it = it->next_same_hash;
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 | return 0;
|
---|
| 751 | }
|
---|
| 752 |
|
---|
| 753 |
|
---|
| 754 | #ifdef __STDC__
|
---|
| 755 | RX_DECL struct rx_hash_item *
|
---|
| 756 | rx_hash_store (struct rx_hash * table,
|
---|
| 757 | unsigned long hash,
|
---|
| 758 | void * value,
|
---|
| 759 | struct rx_hash_rules * rules)
|
---|
| 760 | #else
|
---|
| 761 | RX_DECL struct rx_hash_item *
|
---|
| 762 | rx_hash_store (table, hash, value, rules)
|
---|
| 763 | struct rx_hash * table;
|
---|
| 764 | unsigned long hash;
|
---|
| 765 | void * value;
|
---|
| 766 | struct rx_hash_rules * rules;
|
---|
| 767 | #endif
|
---|
| 768 | {
|
---|
| 769 | rx_hash_eq eq = rules->eq;
|
---|
| 770 | int maskc = 0;
|
---|
| 771 | long mask = rx_hash_masks[0];
|
---|
| 772 | int bucket = (hash & mask) % 13;
|
---|
| 773 | int depth = 0;
|
---|
| 774 |
|
---|
| 775 | while (table->children [bucket])
|
---|
| 776 | {
|
---|
| 777 | table = table->children [bucket];
|
---|
| 778 | ++maskc;
|
---|
| 779 | mask = rx_hash_masks[maskc];
|
---|
| 780 | bucket = (hash & mask) % 13;
|
---|
| 781 | ++depth;
|
---|
| 782 | }
|
---|
| 783 |
|
---|
| 784 | {
|
---|
| 785 | struct rx_hash_item * it = table->buckets[bucket];
|
---|
| 786 | while (it)
|
---|
| 787 | if (eq (it->data, value))
|
---|
| 788 | return it;
|
---|
| 789 | else
|
---|
| 790 | it = it->next_same_hash;
|
---|
| 791 | }
|
---|
| 792 |
|
---|
| 793 | {
|
---|
| 794 | if ( (depth < 3)
|
---|
| 795 | && (table->bucket_size [bucket] >= 4))
|
---|
| 796 | {
|
---|
| 797 | struct rx_hash * newtab = ((struct rx_hash *)
|
---|
| 798 | rules->hash_alloc (rules));
|
---|
| 799 | if (!newtab)
|
---|
| 800 | goto add_to_bucket;
|
---|
| 801 | bzero (newtab, sizeof (*newtab));
|
---|
| 802 | newtab->parent = table;
|
---|
| 803 | {
|
---|
| 804 | struct rx_hash_item * them = table->buckets[bucket];
|
---|
| 805 | unsigned long newmask = rx_hash_masks[maskc + 1];
|
---|
| 806 | while (them)
|
---|
| 807 | {
|
---|
| 808 | struct rx_hash_item * save = them->next_same_hash;
|
---|
| 809 | int new_buck = (them->hash & newmask) % 13;
|
---|
| 810 | them->next_same_hash = newtab->buckets[new_buck];
|
---|
| 811 | newtab->buckets[new_buck] = them;
|
---|
| 812 | them->table = newtab;
|
---|
| 813 | them = save;
|
---|
| 814 | ++newtab->bucket_size[new_buck];
|
---|
| 815 | ++newtab->refs;
|
---|
| 816 | }
|
---|
| 817 | table->refs = (table->refs - table->bucket_size[bucket] + 1);
|
---|
| 818 | table->bucket_size[bucket] = 0;
|
---|
| 819 | table->buckets[bucket] = 0;
|
---|
| 820 | table->children[bucket] = newtab;
|
---|
| 821 | table = newtab;
|
---|
| 822 | bucket = (hash & newmask) % 13;
|
---|
| 823 | }
|
---|
| 824 | }
|
---|
| 825 | }
|
---|
| 826 | add_to_bucket:
|
---|
| 827 | {
|
---|
| 828 | struct rx_hash_item * it = ((struct rx_hash_item *)
|
---|
| 829 | rules->hash_item_alloc (rules, value));
|
---|
| 830 | if (!it)
|
---|
| 831 | return 0;
|
---|
| 832 | it->hash = hash;
|
---|
| 833 | it->table = table;
|
---|
| 834 | /* DATA and BINDING are to be set in hash_item_alloc */
|
---|
| 835 | it->next_same_hash = table->buckets [bucket];
|
---|
| 836 | table->buckets[bucket] = it;
|
---|
| 837 | ++table->bucket_size [bucket];
|
---|
| 838 | ++table->refs;
|
---|
| 839 | return it;
|
---|
| 840 | }
|
---|
| 841 | }
|
---|
| 842 |
|
---|
| 843 |
|
---|
| 844 | #ifdef __STDC__
|
---|
| 845 | RX_DECL void
|
---|
| 846 | rx_hash_free (struct rx_hash_item * it, struct rx_hash_rules * rules)
|
---|
| 847 | #else
|
---|
| 848 | RX_DECL void
|
---|
| 849 | rx_hash_free (it, rules)
|
---|
| 850 | struct rx_hash_item * it;
|
---|
| 851 | struct rx_hash_rules * rules;
|
---|
| 852 | #endif
|
---|
| 853 | {
|
---|
| 854 | if (it)
|
---|
| 855 | {
|
---|
| 856 | struct rx_hash * table = it->table;
|
---|
| 857 | unsigned long hash = it->hash;
|
---|
| 858 | int depth = (table->parent
|
---|
| 859 | ? (table->parent->parent
|
---|
| 860 | ? (table->parent->parent->parent
|
---|
| 861 | ? 3
|
---|
| 862 | : 2)
|
---|
| 863 | : 1)
|
---|
| 864 | : 0);
|
---|
| 865 | int bucket = (hash & rx_hash_masks [depth]) % 13;
|
---|
| 866 | struct rx_hash_item ** pos = &table->buckets [bucket];
|
---|
| 867 |
|
---|
| 868 | while (*pos != it)
|
---|
| 869 | pos = &(*pos)->next_same_hash;
|
---|
| 870 | *pos = it->next_same_hash;
|
---|
| 871 | rules->free_hash_item (it, rules);
|
---|
| 872 | --table->bucket_size[bucket];
|
---|
| 873 | --table->refs;
|
---|
| 874 | while (!table->refs && depth)
|
---|
| 875 | {
|
---|
| 876 | struct rx_hash * save = table;
|
---|
| 877 | table = table->parent;
|
---|
| 878 | --depth;
|
---|
| 879 | bucket = (hash & rx_hash_masks [depth]) % 13;
|
---|
| 880 | --table->refs;
|
---|
| 881 | table->children[bucket] = 0;
|
---|
| 882 | rules->free_hash (save, rules);
|
---|
| 883 | }
|
---|
| 884 | }
|
---|
| 885 | }
|
---|
| 886 |
|
---|
| 887 | #ifdef __STDC__
|
---|
| 888 | RX_DECL void
|
---|
| 889 | rx_free_hash_table (struct rx_hash * tab, rx_hash_freefn freefn,
|
---|
| 890 | struct rx_hash_rules * rules)
|
---|
| 891 | #else
|
---|
| 892 | RX_DECL void
|
---|
| 893 | rx_free_hash_table (tab, freefn, rules)
|
---|
| 894 | struct rx_hash * tab;
|
---|
| 895 | rx_hash_freefn freefn;
|
---|
| 896 | struct rx_hash_rules * rules;
|
---|
| 897 | #endif
|
---|
| 898 | {
|
---|
| 899 | int x;
|
---|
| 900 |
|
---|
| 901 | for (x = 0; x < 13; ++x)
|
---|
| 902 | if (tab->children[x])
|
---|
| 903 | {
|
---|
| 904 | rx_free_hash_table (tab->children[x], freefn, rules);
|
---|
| 905 | rules->free_hash (tab->children[x], rules);
|
---|
| 906 | }
|
---|
| 907 | else
|
---|
| 908 | {
|
---|
| 909 | struct rx_hash_item * them = tab->buckets[x];
|
---|
| 910 | while (them)
|
---|
| 911 | {
|
---|
| 912 | struct rx_hash_item * that = them;
|
---|
| 913 | them = that->next_same_hash;
|
---|
| 914 | freefn (that);
|
---|
| 915 | rules->free_hash_item (that, rules);
|
---|
| 916 | }
|
---|
| 917 | }
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 |
|
---|
| 921 | |
---|
| 922 |
|
---|
| 923 | /* Utilities for manipulating bitset represntations of characters sets. */
|
---|
| 924 |
|
---|
| 925 | #ifdef __STDC__
|
---|
| 926 | RX_DECL rx_Bitset
|
---|
| 927 | rx_cset (struct rx *rx)
|
---|
| 928 | #else
|
---|
| 929 | RX_DECL rx_Bitset
|
---|
| 930 | rx_cset (rx)
|
---|
| 931 | struct rx *rx;
|
---|
| 932 | #endif
|
---|
| 933 | {
|
---|
| 934 | rx_Bitset b = (rx_Bitset) malloc (rx_sizeof_bitset (rx->local_cset_size));
|
---|
| 935 | if (b)
|
---|
| 936 | rx_bitset_null (rx->local_cset_size, b);
|
---|
| 937 | return b;
|
---|
| 938 | }
|
---|
| 939 |
|
---|
| 940 |
|
---|
| 941 | #ifdef __STDC__
|
---|
| 942 | RX_DECL rx_Bitset
|
---|
| 943 | rx_copy_cset (struct rx *rx, rx_Bitset a)
|
---|
| 944 | #else
|
---|
| 945 | RX_DECL rx_Bitset
|
---|
| 946 | rx_copy_cset (rx, a)
|
---|
| 947 | struct rx *rx;
|
---|
| 948 | rx_Bitset a;
|
---|
| 949 | #endif
|
---|
| 950 | {
|
---|
| 951 | rx_Bitset cs = rx_cset (rx);
|
---|
| 952 |
|
---|
| 953 | if (cs)
|
---|
| 954 | rx_bitset_union (rx->local_cset_size, cs, a);
|
---|
| 955 |
|
---|
| 956 | return cs;
|
---|
| 957 | }
|
---|
| 958 |
|
---|
| 959 |
|
---|
| 960 | #ifdef __STDC__
|
---|
| 961 | RX_DECL void
|
---|
| 962 | rx_free_cset (struct rx * rx, rx_Bitset c)
|
---|
| 963 | #else
|
---|
| 964 | RX_DECL void
|
---|
| 965 | rx_free_cset (rx, c)
|
---|
| 966 | struct rx * rx;
|
---|
| 967 | rx_Bitset c;
|
---|
| 968 | #endif
|
---|
| 969 | {
|
---|
| 970 | if (c)
|
---|
| 971 | free ((char *)c);
|
---|
| 972 | }
|
---|
| 973 |
|
---|
| 974 | |
---|
| 975 |
|
---|
| 976 | /* Hash table memory allocation policy for the regexp compiler */
|
---|
| 977 |
|
---|
| 978 | #ifdef __STDC__
|
---|
| 979 | static struct rx_hash *
|
---|
| 980 | compiler_hash_alloc (struct rx_hash_rules * rules)
|
---|
| 981 | #else
|
---|
| 982 | static struct rx_hash *
|
---|
| 983 | compiler_hash_alloc (rules)
|
---|
| 984 | struct rx_hash_rules * rules;
|
---|
| 985 | #endif
|
---|
| 986 | {
|
---|
| 987 | return (struct rx_hash *)malloc (sizeof (struct rx_hash));
|
---|
| 988 | }
|
---|
| 989 |
|
---|
| 990 |
|
---|
| 991 | #ifdef __STDC__
|
---|
| 992 | static struct rx_hash_item *
|
---|
| 993 | compiler_hash_item_alloc (struct rx_hash_rules * rules, void * value)
|
---|
| 994 | #else
|
---|
| 995 | static struct rx_hash_item *
|
---|
| 996 | compiler_hash_item_alloc (rules, value)
|
---|
| 997 | struct rx_hash_rules * rules;
|
---|
| 998 | void * value;
|
---|
| 999 | #endif
|
---|
| 1000 | {
|
---|
| 1001 | struct rx_hash_item * it;
|
---|
| 1002 | it = (struct rx_hash_item *)malloc (sizeof (*it));
|
---|
| 1003 | if (it)
|
---|
| 1004 | {
|
---|
| 1005 | it->data = value;
|
---|
| 1006 | it->binding = 0;
|
---|
| 1007 | }
|
---|
| 1008 | return it;
|
---|
| 1009 | }
|
---|
| 1010 |
|
---|
| 1011 |
|
---|
| 1012 | #ifdef __STDC__
|
---|
| 1013 | static void
|
---|
| 1014 | compiler_free_hash (struct rx_hash * tab,
|
---|
| 1015 | struct rx_hash_rules * rules)
|
---|
| 1016 | #else
|
---|
| 1017 | static void
|
---|
| 1018 | compiler_free_hash (tab, rules)
|
---|
| 1019 | struct rx_hash * tab;
|
---|
| 1020 | struct rx_hash_rules * rules;
|
---|
| 1021 | #endif
|
---|
| 1022 | {
|
---|
| 1023 | free ((char *)tab);
|
---|
| 1024 | }
|
---|
| 1025 |
|
---|
| 1026 |
|
---|
| 1027 | #ifdef __STDC__
|
---|
| 1028 | static void
|
---|
| 1029 | compiler_free_hash_item (struct rx_hash_item * item,
|
---|
| 1030 | struct rx_hash_rules * rules)
|
---|
| 1031 | #else
|
---|
| 1032 | static void
|
---|
| 1033 | compiler_free_hash_item (item, rules)
|
---|
| 1034 | struct rx_hash_item * item;
|
---|
| 1035 | struct rx_hash_rules * rules;
|
---|
| 1036 | #endif
|
---|
| 1037 | {
|
---|
| 1038 | free ((char *)item);
|
---|
| 1039 | }
|
---|
| 1040 |
|
---|
| 1041 | |
---|
| 1042 |
|
---|
| 1043 | /* This page: REXP_NODE (expression tree) structures. */
|
---|
| 1044 |
|
---|
| 1045 | #ifdef __STDC__
|
---|
| 1046 | RX_DECL struct rexp_node *
|
---|
| 1047 | rexp_node (struct rx *rx,
|
---|
| 1048 | enum rexp_node_type type)
|
---|
| 1049 | #else
|
---|
| 1050 | RX_DECL struct rexp_node *
|
---|
| 1051 | rexp_node (rx, type)
|
---|
| 1052 | struct rx *rx;
|
---|
| 1053 | enum rexp_node_type type;
|
---|
| 1054 | #endif
|
---|
| 1055 | {
|
---|
| 1056 | struct rexp_node *n;
|
---|
| 1057 |
|
---|
| 1058 | n = (struct rexp_node *)malloc (sizeof (*n));
|
---|
| 1059 | bzero (n, sizeof (*n));
|
---|
| 1060 | if (n)
|
---|
| 1061 | n->type = type;
|
---|
| 1062 | return n;
|
---|
| 1063 | }
|
---|
| 1064 |
|
---|
| 1065 |
|
---|
| 1066 | /* free_rexp_node assumes that the bitset passed to rx_mk_r_cset
|
---|
| 1067 | * can be freed using rx_free_cset.
|
---|
| 1068 | */
|
---|
| 1069 | #ifdef __STDC__
|
---|
| 1070 | RX_DECL struct rexp_node *
|
---|
| 1071 | rx_mk_r_cset (struct rx * rx,
|
---|
| 1072 | rx_Bitset b)
|
---|
| 1073 | #else
|
---|
| 1074 | RX_DECL struct rexp_node *
|
---|
| 1075 | rx_mk_r_cset (rx, b)
|
---|
| 1076 | struct rx * rx;
|
---|
| 1077 | rx_Bitset b;
|
---|
| 1078 | #endif
|
---|
| 1079 | {
|
---|
| 1080 | struct rexp_node * n = rexp_node (rx, r_cset);
|
---|
| 1081 | if (n)
|
---|
| 1082 | n->params.cset = b;
|
---|
| 1083 | return n;
|
---|
| 1084 | }
|
---|
| 1085 |
|
---|
| 1086 |
|
---|
| 1087 | #ifdef __STDC__
|
---|
| 1088 | RX_DECL struct rexp_node *
|
---|
| 1089 | rx_mk_r_concat (struct rx * rx,
|
---|
| 1090 | struct rexp_node * a,
|
---|
| 1091 | struct rexp_node * b)
|
---|
| 1092 | #else
|
---|
| 1093 | RX_DECL struct rexp_node *
|
---|
| 1094 | rx_mk_r_concat (rx, a, b)
|
---|
| 1095 | struct rx * rx;
|
---|
| 1096 | struct rexp_node * a;
|
---|
| 1097 | struct rexp_node * b;
|
---|
| 1098 | #endif
|
---|
| 1099 | {
|
---|
| 1100 | struct rexp_node * n = rexp_node (rx, r_concat);
|
---|
| 1101 | if (n)
|
---|
| 1102 | {
|
---|
| 1103 | n->params.pair.left = a;
|
---|
| 1104 | n->params.pair.right = b;
|
---|
| 1105 | }
|
---|
| 1106 | return n;
|
---|
| 1107 | }
|
---|
| 1108 |
|
---|
| 1109 |
|
---|
| 1110 | #ifdef __STDC__
|
---|
| 1111 | RX_DECL struct rexp_node *
|
---|
| 1112 | rx_mk_r_alternate (struct rx * rx,
|
---|
| 1113 | struct rexp_node * a,
|
---|
| 1114 | struct rexp_node * b)
|
---|
| 1115 | #else
|
---|
| 1116 | RX_DECL struct rexp_node *
|
---|
| 1117 | rx_mk_r_alternate (rx, a, b)
|
---|
| 1118 | struct rx * rx;
|
---|
| 1119 | struct rexp_node * a;
|
---|
| 1120 | struct rexp_node * b;
|
---|
| 1121 | #endif
|
---|
| 1122 | {
|
---|
| 1123 | struct rexp_node * n = rexp_node (rx, r_alternate);
|
---|
| 1124 | if (n)
|
---|
| 1125 | {
|
---|
| 1126 | n->params.pair.left = a;
|
---|
| 1127 | n->params.pair.right = b;
|
---|
| 1128 | }
|
---|
| 1129 | return n;
|
---|
| 1130 | }
|
---|
| 1131 |
|
---|
| 1132 |
|
---|
| 1133 | #ifdef __STDC__
|
---|
| 1134 | RX_DECL struct rexp_node *
|
---|
| 1135 | rx_mk_r_opt (struct rx * rx,
|
---|
| 1136 | struct rexp_node * a)
|
---|
| 1137 | #else
|
---|
| 1138 | RX_DECL struct rexp_node *
|
---|
| 1139 | rx_mk_r_opt (rx, a)
|
---|
| 1140 | struct rx * rx;
|
---|
| 1141 | struct rexp_node * a;
|
---|
| 1142 | #endif
|
---|
| 1143 | {
|
---|
| 1144 | struct rexp_node * n = rexp_node (rx, r_opt);
|
---|
| 1145 | if (n)
|
---|
| 1146 | {
|
---|
| 1147 | n->params.pair.left = a;
|
---|
| 1148 | n->params.pair.right = 0;
|
---|
| 1149 | }
|
---|
| 1150 | return n;
|
---|
| 1151 | }
|
---|
| 1152 |
|
---|
| 1153 |
|
---|
| 1154 | #ifdef __STDC__
|
---|
| 1155 | RX_DECL struct rexp_node *
|
---|
| 1156 | rx_mk_r_star (struct rx * rx,
|
---|
| 1157 | struct rexp_node * a)
|
---|
| 1158 | #else
|
---|
| 1159 | RX_DECL struct rexp_node *
|
---|
| 1160 | rx_mk_r_star (rx, a)
|
---|
| 1161 | struct rx * rx;
|
---|
| 1162 | struct rexp_node * a;
|
---|
| 1163 | #endif
|
---|
| 1164 | {
|
---|
| 1165 | struct rexp_node * n = rexp_node (rx, r_star);
|
---|
| 1166 | if (n)
|
---|
| 1167 | {
|
---|
| 1168 | n->params.pair.left = a;
|
---|
| 1169 | n->params.pair.right = 0;
|
---|
| 1170 | }
|
---|
| 1171 | return n;
|
---|
| 1172 | }
|
---|
| 1173 |
|
---|
| 1174 |
|
---|
| 1175 | #ifdef __STDC__
|
---|
| 1176 | RX_DECL struct rexp_node *
|
---|
| 1177 | rx_mk_r_2phase_star (struct rx * rx,
|
---|
| 1178 | struct rexp_node * a,
|
---|
| 1179 | struct rexp_node * b)
|
---|
| 1180 | #else
|
---|
| 1181 | RX_DECL struct rexp_node *
|
---|
| 1182 | rx_mk_r_2phase_star (rx, a, b)
|
---|
| 1183 | struct rx * rx;
|
---|
| 1184 | struct rexp_node * a;
|
---|
| 1185 | struct rexp_node * b;
|
---|
| 1186 | #endif
|
---|
| 1187 | {
|
---|
| 1188 | struct rexp_node * n = rexp_node (rx, r_2phase_star);
|
---|
| 1189 | if (n)
|
---|
| 1190 | {
|
---|
| 1191 | n->params.pair.left = a;
|
---|
| 1192 | n->params.pair.right = b;
|
---|
| 1193 | }
|
---|
| 1194 | return n;
|
---|
| 1195 | }
|
---|
| 1196 |
|
---|
| 1197 |
|
---|
| 1198 | #ifdef __STDC__
|
---|
| 1199 | RX_DECL struct rexp_node *
|
---|
| 1200 | rx_mk_r_side_effect (struct rx * rx,
|
---|
| 1201 | rx_side_effect a)
|
---|
| 1202 | #else
|
---|
| 1203 | RX_DECL struct rexp_node *
|
---|
| 1204 | rx_mk_r_side_effect (rx, a)
|
---|
| 1205 | struct rx * rx;
|
---|
| 1206 | rx_side_effect a;
|
---|
| 1207 | #endif
|
---|
| 1208 | {
|
---|
| 1209 | struct rexp_node * n = rexp_node (rx, r_side_effect);
|
---|
| 1210 | if (n)
|
---|
| 1211 | {
|
---|
| 1212 | n->params.side_effect = a;
|
---|
| 1213 | n->params.pair.right = 0;
|
---|
| 1214 | }
|
---|
| 1215 | return n;
|
---|
| 1216 | }
|
---|
| 1217 |
|
---|
| 1218 |
|
---|
| 1219 | #ifdef __STDC__
|
---|
| 1220 | RX_DECL struct rexp_node *
|
---|
| 1221 | rx_mk_r_data (struct rx * rx,
|
---|
| 1222 | void * a)
|
---|
| 1223 | #else
|
---|
| 1224 | RX_DECL struct rexp_node *
|
---|
| 1225 | rx_mk_r_data (rx, a)
|
---|
| 1226 | struct rx * rx;
|
---|
| 1227 | void * a;
|
---|
| 1228 | #endif
|
---|
| 1229 | {
|
---|
| 1230 | struct rexp_node * n = rexp_node (rx, r_data);
|
---|
| 1231 | if (n)
|
---|
| 1232 | {
|
---|
| 1233 | n->params.pair.left = a;
|
---|
| 1234 | n->params.pair.right = 0;
|
---|
| 1235 | }
|
---|
| 1236 | return n;
|
---|
| 1237 | }
|
---|
| 1238 |
|
---|
| 1239 |
|
---|
| 1240 | #ifdef __STDC__
|
---|
| 1241 | RX_DECL void
|
---|
| 1242 | rx_free_rexp (struct rx * rx, struct rexp_node * node)
|
---|
| 1243 | #else
|
---|
| 1244 | RX_DECL void
|
---|
| 1245 | rx_free_rexp (rx, node)
|
---|
| 1246 | struct rx * rx;
|
---|
| 1247 | struct rexp_node * node;
|
---|
| 1248 | #endif
|
---|
| 1249 | {
|
---|
| 1250 | if (node)
|
---|
| 1251 | {
|
---|
| 1252 | switch (node->type)
|
---|
| 1253 | {
|
---|
| 1254 | case r_cset:
|
---|
| 1255 | if (node->params.cset)
|
---|
| 1256 | rx_free_cset (rx, node->params.cset);
|
---|
| 1257 |
|
---|
| 1258 | case r_side_effect:
|
---|
| 1259 | break;
|
---|
| 1260 |
|
---|
| 1261 | case r_concat:
|
---|
| 1262 | case r_alternate:
|
---|
| 1263 | case r_2phase_star:
|
---|
| 1264 | case r_opt:
|
---|
| 1265 | case r_star:
|
---|
| 1266 | rx_free_rexp (rx, node->params.pair.left);
|
---|
| 1267 | rx_free_rexp (rx, node->params.pair.right);
|
---|
| 1268 | break;
|
---|
| 1269 |
|
---|
| 1270 | case r_data:
|
---|
| 1271 | /* This shouldn't occur. */
|
---|
| 1272 | break;
|
---|
| 1273 | }
|
---|
| 1274 | free ((char *)node);
|
---|
| 1275 | }
|
---|
| 1276 | }
|
---|
| 1277 |
|
---|
| 1278 |
|
---|
| 1279 | #ifdef __STDC__
|
---|
| 1280 | RX_DECL struct rexp_node *
|
---|
| 1281 | rx_copy_rexp (struct rx *rx,
|
---|
| 1282 | struct rexp_node *node)
|
---|
| 1283 | #else
|
---|
| 1284 | RX_DECL struct rexp_node *
|
---|
| 1285 | rx_copy_rexp (rx, node)
|
---|
| 1286 | struct rx *rx;
|
---|
| 1287 | struct rexp_node *node;
|
---|
| 1288 | #endif
|
---|
| 1289 | {
|
---|
| 1290 | if (!node)
|
---|
| 1291 | return 0;
|
---|
| 1292 | else
|
---|
| 1293 | {
|
---|
| 1294 | struct rexp_node *n = rexp_node (rx, node->type);
|
---|
| 1295 | if (!n)
|
---|
| 1296 | return 0;
|
---|
| 1297 | switch (node->type)
|
---|
| 1298 | {
|
---|
| 1299 | case r_cset:
|
---|
| 1300 | n->params.cset = rx_copy_cset (rx, node->params.cset);
|
---|
| 1301 | if (!n->params.cset)
|
---|
| 1302 | {
|
---|
| 1303 | rx_free_rexp (rx, n);
|
---|
| 1304 | return 0;
|
---|
| 1305 | }
|
---|
| 1306 | break;
|
---|
| 1307 |
|
---|
| 1308 | case r_side_effect:
|
---|
| 1309 | n->params.side_effect = node->params.side_effect;
|
---|
| 1310 | break;
|
---|
| 1311 |
|
---|
| 1312 | case r_concat:
|
---|
| 1313 | case r_alternate:
|
---|
| 1314 | case r_opt:
|
---|
| 1315 | case r_2phase_star:
|
---|
| 1316 | case r_star:
|
---|
| 1317 | n->params.pair.left =
|
---|
| 1318 | rx_copy_rexp (rx, node->params.pair.left);
|
---|
| 1319 | n->params.pair.right =
|
---|
| 1320 | rx_copy_rexp (rx, node->params.pair.right);
|
---|
| 1321 | if ( (node->params.pair.left && !n->params.pair.left)
|
---|
| 1322 | || (node->params.pair.right && !n->params.pair.right))
|
---|
| 1323 | {
|
---|
| 1324 | rx_free_rexp (rx, n);
|
---|
| 1325 | return 0;
|
---|
| 1326 | }
|
---|
| 1327 | break;
|
---|
| 1328 | case r_data:
|
---|
| 1329 | /* shouldn't happen */
|
---|
| 1330 | break;
|
---|
| 1331 | }
|
---|
| 1332 | return n;
|
---|
| 1333 | }
|
---|
| 1334 | }
|
---|
| 1335 |
|
---|
| 1336 |
|
---|
| 1337 | |
---|
| 1338 |
|
---|
| 1339 | /* This page: functions to build and destroy graphs that describe nfa's */
|
---|
| 1340 |
|
---|
| 1341 | /* Constructs a new nfa node. */
|
---|
| 1342 | #ifdef __STDC__
|
---|
| 1343 | RX_DECL struct rx_nfa_state *
|
---|
| 1344 | rx_nfa_state (struct rx *rx)
|
---|
| 1345 | #else
|
---|
| 1346 | RX_DECL struct rx_nfa_state *
|
---|
| 1347 | rx_nfa_state (rx)
|
---|
| 1348 | struct rx *rx;
|
---|
| 1349 | #endif
|
---|
| 1350 | {
|
---|
| 1351 | struct rx_nfa_state * n = (struct rx_nfa_state *)malloc (sizeof (*n));
|
---|
| 1352 | if (!n)
|
---|
| 1353 | return 0;
|
---|
| 1354 | bzero (n, sizeof (*n));
|
---|
| 1355 | n->next = rx->nfa_states;
|
---|
| 1356 | rx->nfa_states = n;
|
---|
| 1357 | return n;
|
---|
| 1358 | }
|
---|
| 1359 |
|
---|
| 1360 |
|
---|
| 1361 | #ifdef __STDC__
|
---|
| 1362 | RX_DECL void
|
---|
| 1363 | rx_free_nfa_state (struct rx_nfa_state * n)
|
---|
| 1364 | #else
|
---|
| 1365 | RX_DECL void
|
---|
| 1366 | rx_free_nfa_state (n)
|
---|
| 1367 | struct rx_nfa_state * n;
|
---|
| 1368 | #endif
|
---|
| 1369 | {
|
---|
| 1370 | free ((char *)n);
|
---|
| 1371 | }
|
---|
| 1372 |
|
---|
| 1373 |
|
---|
| 1374 | /* This looks up an nfa node, given a numeric id. Numeric id's are
|
---|
| 1375 | * assigned after the nfa has been built.
|
---|
| 1376 | */
|
---|
| 1377 | #ifdef __STDC__
|
---|
| 1378 | RX_DECL struct rx_nfa_state *
|
---|
| 1379 | rx_id_to_nfa_state (struct rx * rx,
|
---|
| 1380 | int id)
|
---|
| 1381 | #else
|
---|
| 1382 | RX_DECL struct rx_nfa_state *
|
---|
| 1383 | rx_id_to_nfa_state (rx, id)
|
---|
| 1384 | struct rx * rx;
|
---|
| 1385 | int id;
|
---|
| 1386 | #endif
|
---|
| 1387 | {
|
---|
| 1388 | struct rx_nfa_state * n;
|
---|
| 1389 | for (n = rx->nfa_states; n; n = n->next)
|
---|
| 1390 | if (n->id == id)
|
---|
| 1391 | return n;
|
---|
| 1392 | return 0;
|
---|
| 1393 | }
|
---|
| 1394 |
|
---|
| 1395 |
|
---|
| 1396 | /* This adds an edge between two nodes, but doesn't initialize the
|
---|
| 1397 | * edge label.
|
---|
| 1398 | */
|
---|
| 1399 |
|
---|
| 1400 | #ifdef __STDC__
|
---|
| 1401 | RX_DECL struct rx_nfa_edge *
|
---|
| 1402 | rx_nfa_edge (struct rx *rx,
|
---|
| 1403 | enum rx_nfa_etype type,
|
---|
| 1404 | struct rx_nfa_state *start,
|
---|
| 1405 | struct rx_nfa_state *dest)
|
---|
| 1406 | #else
|
---|
| 1407 | RX_DECL struct rx_nfa_edge *
|
---|
| 1408 | rx_nfa_edge (rx, type, start, dest)
|
---|
| 1409 | struct rx *rx;
|
---|
| 1410 | enum rx_nfa_etype type;
|
---|
| 1411 | struct rx_nfa_state *start;
|
---|
| 1412 | struct rx_nfa_state *dest;
|
---|
| 1413 | #endif
|
---|
| 1414 | {
|
---|
| 1415 | struct rx_nfa_edge *e;
|
---|
| 1416 | e = (struct rx_nfa_edge *)malloc (sizeof (*e));
|
---|
| 1417 | if (!e)
|
---|
| 1418 | return 0;
|
---|
| 1419 | e->next = start->edges;
|
---|
| 1420 | start->edges = e;
|
---|
| 1421 | e->type = type;
|
---|
| 1422 | e->dest = dest;
|
---|
| 1423 | return e;
|
---|
| 1424 | }
|
---|
| 1425 |
|
---|
| 1426 |
|
---|
| 1427 | #ifdef __STDC__
|
---|
| 1428 | RX_DECL void
|
---|
| 1429 | rx_free_nfa_edge (struct rx_nfa_edge * e)
|
---|
| 1430 | #else
|
---|
| 1431 | RX_DECL void
|
---|
| 1432 | rx_free_nfa_edge (e)
|
---|
| 1433 | struct rx_nfa_edge * e;
|
---|
| 1434 | #endif
|
---|
| 1435 | {
|
---|
| 1436 | free ((char *)e);
|
---|
| 1437 | }
|
---|
| 1438 |
|
---|
| 1439 |
|
---|
| 1440 | /* This constructs a POSSIBLE_FUTURE, which is a kind epsilon-closure
|
---|
| 1441 | * of an NFA. These are added to an nfa automaticly by eclose_nfa.
|
---|
| 1442 | */
|
---|
| 1443 |
|
---|
| 1444 | #ifdef __STDC__
|
---|
| 1445 | static struct rx_possible_future *
|
---|
| 1446 | rx_possible_future (struct rx * rx,
|
---|
| 1447 | struct rx_se_list * effects)
|
---|
| 1448 | #else
|
---|
| 1449 | static struct rx_possible_future *
|
---|
| 1450 | rx_possible_future (rx, effects)
|
---|
| 1451 | struct rx * rx;
|
---|
| 1452 | struct rx_se_list * effects;
|
---|
| 1453 | #endif
|
---|
| 1454 | {
|
---|
| 1455 | struct rx_possible_future *ec;
|
---|
| 1456 | ec = (struct rx_possible_future *) malloc (sizeof (*ec));
|
---|
| 1457 | if (!ec)
|
---|
| 1458 | return 0;
|
---|
| 1459 | ec->destset = 0;
|
---|
| 1460 | ec->next = 0;
|
---|
| 1461 | ec->effects = effects;
|
---|
| 1462 | return ec;
|
---|
| 1463 | }
|
---|
| 1464 |
|
---|
| 1465 |
|
---|
| 1466 | #ifdef __STDC__
|
---|
| 1467 | static void
|
---|
| 1468 | rx_free_possible_future (struct rx_possible_future * pf)
|
---|
| 1469 | #else
|
---|
| 1470 | static void
|
---|
| 1471 | rx_free_possible_future (pf)
|
---|
| 1472 | struct rx_possible_future * pf;
|
---|
| 1473 | #endif
|
---|
| 1474 | {
|
---|
| 1475 | free ((char *)pf);
|
---|
| 1476 | }
|
---|
| 1477 |
|
---|
| 1478 |
|
---|
| 1479 | #ifdef __STDC__
|
---|
| 1480 | RX_DECL void
|
---|
| 1481 | rx_free_nfa (struct rx *rx)
|
---|
| 1482 | #else
|
---|
| 1483 | RX_DECL void
|
---|
| 1484 | rx_free_nfa (rx)
|
---|
| 1485 | struct rx *rx;
|
---|
| 1486 | #endif
|
---|
| 1487 | {
|
---|
| 1488 | while (rx->nfa_states)
|
---|
| 1489 | {
|
---|
| 1490 | while (rx->nfa_states->edges)
|
---|
| 1491 | {
|
---|
| 1492 | switch (rx->nfa_states->edges->type)
|
---|
| 1493 | {
|
---|
| 1494 | case ne_cset:
|
---|
| 1495 | rx_free_cset (rx, rx->nfa_states->edges->params.cset);
|
---|
| 1496 | break;
|
---|
| 1497 | default:
|
---|
| 1498 | break;
|
---|
| 1499 | }
|
---|
| 1500 | {
|
---|
| 1501 | struct rx_nfa_edge * e;
|
---|
| 1502 | e = rx->nfa_states->edges;
|
---|
| 1503 | rx->nfa_states->edges = rx->nfa_states->edges->next;
|
---|
| 1504 | rx_free_nfa_edge (e);
|
---|
| 1505 | }
|
---|
| 1506 | } /* while (rx->nfa_states->edges) */
|
---|
| 1507 | {
|
---|
| 1508 | /* Iterate over the partial epsilon closures of rx->nfa_states */
|
---|
| 1509 | struct rx_possible_future * pf = rx->nfa_states->futures;
|
---|
| 1510 | while (pf)
|
---|
| 1511 | {
|
---|
| 1512 | struct rx_possible_future * pft = pf;
|
---|
| 1513 | pf = pf->next;
|
---|
| 1514 | rx_free_possible_future (pft);
|
---|
| 1515 | }
|
---|
| 1516 | }
|
---|
| 1517 | {
|
---|
| 1518 | struct rx_nfa_state *n;
|
---|
| 1519 | n = rx->nfa_states;
|
---|
| 1520 | rx->nfa_states = rx->nfa_states->next;
|
---|
| 1521 | rx_free_nfa_state (n);
|
---|
| 1522 | }
|
---|
| 1523 | }
|
---|
| 1524 | }
|
---|
| 1525 |
|
---|
| 1526 |
|
---|
| 1527 | |
---|
| 1528 |
|
---|
| 1529 | /* This page: translating a pattern expression into an nfa and doing the
|
---|
| 1530 | * static part of the nfa->super-nfa translation.
|
---|
| 1531 | */
|
---|
| 1532 |
|
---|
| 1533 | /* This is the thompson regexp->nfa algorithm.
|
---|
| 1534 | * It is modified to allow for `side-effect epsilons.' Those are
|
---|
| 1535 | * edges that are taken whenever a similar epsilon edge would be,
|
---|
| 1536 | * but which imply that some side effect occurs when the edge
|
---|
| 1537 | * is taken.
|
---|
| 1538 | *
|
---|
| 1539 | * Side effects are used to model parts of the pattern langauge
|
---|
| 1540 | * that are not regular (in the formal sense).
|
---|
| 1541 | */
|
---|
| 1542 |
|
---|
| 1543 | #ifdef __STDC__
|
---|
| 1544 | RX_DECL int
|
---|
| 1545 | rx_build_nfa (struct rx *rx,
|
---|
| 1546 | struct rexp_node *rexp,
|
---|
| 1547 | struct rx_nfa_state **start,
|
---|
| 1548 | struct rx_nfa_state **end)
|
---|
| 1549 | #else
|
---|
| 1550 | RX_DECL int
|
---|
| 1551 | rx_build_nfa (rx, rexp, start, end)
|
---|
| 1552 | struct rx *rx;
|
---|
| 1553 | struct rexp_node *rexp;
|
---|
| 1554 | struct rx_nfa_state **start;
|
---|
| 1555 | struct rx_nfa_state **end;
|
---|
| 1556 | #endif
|
---|
| 1557 | {
|
---|
| 1558 | struct rx_nfa_edge *edge;
|
---|
| 1559 |
|
---|
| 1560 | /* Start & end nodes may have been allocated by the caller. */
|
---|
| 1561 | *start = *start ? *start : rx_nfa_state (rx);
|
---|
| 1562 |
|
---|
| 1563 | if (!*start)
|
---|
| 1564 | return 0;
|
---|
| 1565 |
|
---|
| 1566 | if (!rexp)
|
---|
| 1567 | {
|
---|
| 1568 | *end = *start;
|
---|
| 1569 | return 1;
|
---|
| 1570 | }
|
---|
| 1571 |
|
---|
| 1572 | *end = *end ? *end : rx_nfa_state (rx);
|
---|
| 1573 |
|
---|
| 1574 | if (!*end)
|
---|
| 1575 | {
|
---|
| 1576 | rx_free_nfa_state (*start);
|
---|
| 1577 | return 0;
|
---|
| 1578 | }
|
---|
| 1579 |
|
---|
| 1580 | switch (rexp->type)
|
---|
| 1581 | {
|
---|
| 1582 | case r_data:
|
---|
| 1583 | return 0;
|
---|
| 1584 |
|
---|
| 1585 | case r_cset:
|
---|
| 1586 | edge = rx_nfa_edge (rx, ne_cset, *start, *end);
|
---|
| 1587 | if (!edge)
|
---|
| 1588 | return 0;
|
---|
| 1589 | edge->params.cset = rx_copy_cset (rx, rexp->params.cset);
|
---|
| 1590 | if (!edge->params.cset)
|
---|
| 1591 | {
|
---|
| 1592 | rx_free_nfa_edge (edge);
|
---|
| 1593 | return 0;
|
---|
| 1594 | }
|
---|
| 1595 | return 1;
|
---|
| 1596 |
|
---|
| 1597 | case r_opt:
|
---|
| 1598 | return (rx_build_nfa (rx, rexp->params.pair.left, start, end)
|
---|
| 1599 | && rx_nfa_edge (rx, ne_epsilon, *start, *end));
|
---|
| 1600 |
|
---|
| 1601 | case r_star:
|
---|
| 1602 | {
|
---|
| 1603 | struct rx_nfa_state * star_start = 0;
|
---|
| 1604 | struct rx_nfa_state * star_end = 0;
|
---|
| 1605 | return (rx_build_nfa (rx, rexp->params.pair.left,
|
---|
| 1606 | &star_start, &star_end)
|
---|
| 1607 | && star_start
|
---|
| 1608 | && star_end
|
---|
| 1609 | && rx_nfa_edge (rx, ne_epsilon, star_start, star_end)
|
---|
| 1610 | && rx_nfa_edge (rx, ne_epsilon, *start, star_start)
|
---|
| 1611 | && rx_nfa_edge (rx, ne_epsilon, star_end, *end)
|
---|
| 1612 |
|
---|
| 1613 | && rx_nfa_edge (rx, ne_epsilon, star_end, star_start));
|
---|
| 1614 | }
|
---|
| 1615 |
|
---|
| 1616 | case r_2phase_star:
|
---|
| 1617 | {
|
---|
| 1618 | struct rx_nfa_state * star_start = 0;
|
---|
| 1619 | struct rx_nfa_state * star_end = 0;
|
---|
| 1620 | struct rx_nfa_state * loop_exp_start = 0;
|
---|
| 1621 | struct rx_nfa_state * loop_exp_end = 0;
|
---|
| 1622 |
|
---|
| 1623 | return (rx_build_nfa (rx, rexp->params.pair.left,
|
---|
| 1624 | &star_start, &star_end)
|
---|
| 1625 | && rx_build_nfa (rx, rexp->params.pair.right,
|
---|
| 1626 | &loop_exp_start, &loop_exp_end)
|
---|
| 1627 | && star_start
|
---|
| 1628 | && star_end
|
---|
| 1629 | && loop_exp_end
|
---|
| 1630 | && loop_exp_start
|
---|
| 1631 | && rx_nfa_edge (rx, ne_epsilon, star_start, *end)
|
---|
| 1632 | && rx_nfa_edge (rx, ne_epsilon, *start, star_start)
|
---|
| 1633 | && rx_nfa_edge (rx, ne_epsilon, star_end, *end)
|
---|
| 1634 |
|
---|
| 1635 | && rx_nfa_edge (rx, ne_epsilon, star_end, loop_exp_start)
|
---|
| 1636 | && rx_nfa_edge (rx, ne_epsilon, loop_exp_end, star_start));
|
---|
| 1637 | }
|
---|
| 1638 |
|
---|
| 1639 |
|
---|
| 1640 | case r_concat:
|
---|
| 1641 | {
|
---|
| 1642 | struct rx_nfa_state *shared = 0;
|
---|
| 1643 | return
|
---|
| 1644 | (rx_build_nfa (rx, rexp->params.pair.left, start, &shared)
|
---|
| 1645 | && rx_build_nfa (rx, rexp->params.pair.right, &shared, end));
|
---|
| 1646 | }
|
---|
| 1647 |
|
---|
| 1648 | case r_alternate:
|
---|
| 1649 | {
|
---|
| 1650 | struct rx_nfa_state *ls = 0;
|
---|
| 1651 | struct rx_nfa_state *le = 0;
|
---|
| 1652 | struct rx_nfa_state *rs = 0;
|
---|
| 1653 | struct rx_nfa_state *re = 0;
|
---|
| 1654 | return (rx_build_nfa (rx, rexp->params.pair.left, &ls, &le)
|
---|
| 1655 | && rx_build_nfa (rx, rexp->params.pair.right, &rs, &re)
|
---|
| 1656 | && rx_nfa_edge (rx, ne_epsilon, *start, ls)
|
---|
| 1657 | && rx_nfa_edge (rx, ne_epsilon, *start, rs)
|
---|
| 1658 | && rx_nfa_edge (rx, ne_epsilon, le, *end)
|
---|
| 1659 | && rx_nfa_edge (rx, ne_epsilon, re, *end));
|
---|
| 1660 | }
|
---|
| 1661 |
|
---|
| 1662 | case r_side_effect:
|
---|
| 1663 | edge = rx_nfa_edge (rx, ne_side_effect, *start, *end);
|
---|
| 1664 | if (!edge)
|
---|
| 1665 | return 0;
|
---|
| 1666 | edge->params.side_effect = rexp->params.side_effect;
|
---|
| 1667 | return 1;
|
---|
| 1668 | }
|
---|
| 1669 |
|
---|
| 1670 | /* this should never happen */
|
---|
| 1671 | return 0;
|
---|
| 1672 | }
|
---|
| 1673 |
|
---|
| 1674 |
|
---|
| 1675 | /* RX_NAME_NFA_STATES identifies all nodes with outgoing non-epsilon
|
---|
| 1676 | * transitions. Only these nodes can occur in super-states.
|
---|
| 1677 | * All nodes are given an integer id.
|
---|
| 1678 | * The id is non-negative if the node has non-epsilon out-transitions, negative
|
---|
| 1679 | * otherwise (this is because we want the non-negative ids to be used as
|
---|
| 1680 | * array indexes in a few places).
|
---|
| 1681 | */
|
---|
| 1682 |
|
---|
| 1683 | #ifdef __STDC__
|
---|
| 1684 | RX_DECL void
|
---|
| 1685 | rx_name_nfa_states (struct rx *rx)
|
---|
| 1686 | #else
|
---|
| 1687 | RX_DECL void
|
---|
| 1688 | rx_name_nfa_states (rx)
|
---|
| 1689 | struct rx *rx;
|
---|
| 1690 | #endif
|
---|
| 1691 | {
|
---|
| 1692 | struct rx_nfa_state *n = rx->nfa_states;
|
---|
| 1693 |
|
---|
| 1694 | rx->nodec = 0;
|
---|
| 1695 | rx->epsnodec = -1;
|
---|
| 1696 |
|
---|
| 1697 | while (n)
|
---|
| 1698 | {
|
---|
| 1699 | struct rx_nfa_edge *e = n->edges;
|
---|
| 1700 |
|
---|
| 1701 | if (n->is_start)
|
---|
| 1702 | n->eclosure_needed = 1;
|
---|
| 1703 |
|
---|
| 1704 | while (e)
|
---|
| 1705 | {
|
---|
| 1706 | switch (e->type)
|
---|
| 1707 | {
|
---|
| 1708 | case ne_epsilon:
|
---|
| 1709 | case ne_side_effect:
|
---|
| 1710 | break;
|
---|
| 1711 |
|
---|
| 1712 | case ne_cset:
|
---|
| 1713 | n->id = rx->nodec++;
|
---|
| 1714 | {
|
---|
| 1715 | struct rx_nfa_edge *from_n = n->edges;
|
---|
| 1716 | while (from_n)
|
---|
| 1717 | {
|
---|
| 1718 | from_n->dest->eclosure_needed = 1;
|
---|
| 1719 | from_n = from_n->next;
|
---|
| 1720 | }
|
---|
| 1721 | }
|
---|
| 1722 | goto cont;
|
---|
| 1723 | }
|
---|
| 1724 | e = e->next;
|
---|
| 1725 | }
|
---|
| 1726 | n->id = rx->epsnodec--;
|
---|
| 1727 | cont:
|
---|
| 1728 | n = n->next;
|
---|
| 1729 | }
|
---|
| 1730 | rx->epsnodec = -rx->epsnodec;
|
---|
| 1731 | }
|
---|
| 1732 |
|
---|
| 1733 | |
---|
| 1734 |
|
---|
| 1735 | /* This page: data structures for the static part of the nfa->supernfa
|
---|
| 1736 | * translation.
|
---|
| 1737 | *
|
---|
| 1738 | * There are side effect lists -- lists of side effects occuring
|
---|
| 1739 | * along an uninterrupted, acyclic path of side-effect epsilon edges.
|
---|
| 1740 | * Such paths are collapsed to single edges in the course of computing
|
---|
| 1741 | * epsilon closures. Such single edges are labled with a list of all
|
---|
| 1742 | * the side effects entailed in crossing them. Like lists of side
|
---|
| 1743 | * effects are made == by the constructors below.
|
---|
| 1744 | *
|
---|
| 1745 | * There are also nfa state sets. These are used to hold a list of all
|
---|
| 1746 | * states reachable from a starting state for a given type of transition
|
---|
| 1747 | * and side effect list. These are also hash-consed.
|
---|
| 1748 | */
|
---|
| 1749 |
|
---|
| 1750 | /* The next several functions compare, construct, etc. lists of side
|
---|
| 1751 | * effects. See ECLOSE_NFA (below) for details.
|
---|
| 1752 | */
|
---|
| 1753 |
|
---|
| 1754 | /* Ordering of rx_se_list
|
---|
| 1755 | * (-1, 0, 1 return value convention).
|
---|
| 1756 | */
|
---|
| 1757 |
|
---|
| 1758 | #ifdef __STDC__
|
---|
| 1759 | static int
|
---|
| 1760 | se_list_cmp (void * va, void * vb)
|
---|
| 1761 | #else
|
---|
| 1762 | static int
|
---|
| 1763 | se_list_cmp (va, vb)
|
---|
| 1764 | void * va;
|
---|
| 1765 | void * vb;
|
---|
| 1766 | #endif
|
---|
| 1767 | {
|
---|
| 1768 | struct rx_se_list * a = (struct rx_se_list *)va;
|
---|
| 1769 | struct rx_se_list * b = (struct rx_se_list *)vb;
|
---|
| 1770 |
|
---|
| 1771 | return ((va == vb)
|
---|
| 1772 | ? 0
|
---|
| 1773 | : (!va
|
---|
| 1774 | ? -1
|
---|
| 1775 | : (!vb
|
---|
| 1776 | ? 1
|
---|
| 1777 | : ((long)a->car < (long)b->car
|
---|
| 1778 | ? 1
|
---|
| 1779 | : ((long)a->car > (long)b->car
|
---|
| 1780 | ? -1
|
---|
| 1781 | : se_list_cmp ((void *)a->cdr, (void *)b->cdr))))));
|
---|
| 1782 | }
|
---|
| 1783 |
|
---|
| 1784 |
|
---|
| 1785 | #ifdef __STDC__
|
---|
| 1786 | static int
|
---|
| 1787 | se_list_equal (void * va, void * vb)
|
---|
| 1788 | #else
|
---|
| 1789 | static int
|
---|
| 1790 | se_list_equal (va, vb)
|
---|
| 1791 | void * va;
|
---|
| 1792 | void * vb;
|
---|
| 1793 | #endif
|
---|
| 1794 | {
|
---|
| 1795 | return !(se_list_cmp (va, vb));
|
---|
| 1796 | }
|
---|
| 1797 |
|
---|
| 1798 | static struct rx_hash_rules se_list_hash_rules =
|
---|
| 1799 | {
|
---|
| 1800 | se_list_equal,
|
---|
| 1801 | compiler_hash_alloc,
|
---|
| 1802 | compiler_free_hash,
|
---|
| 1803 | compiler_hash_item_alloc,
|
---|
| 1804 | compiler_free_hash_item
|
---|
| 1805 | };
|
---|
| 1806 |
|
---|
| 1807 |
|
---|
| 1808 | #ifdef __STDC__
|
---|
| 1809 | static struct rx_se_list *
|
---|
| 1810 | side_effect_cons (struct rx * rx,
|
---|
| 1811 | void * se, struct rx_se_list * list)
|
---|
| 1812 | #else
|
---|
| 1813 | static struct rx_se_list *
|
---|
| 1814 | side_effect_cons (rx, se, list)
|
---|
| 1815 | struct rx * rx;
|
---|
| 1816 | void * se;
|
---|
| 1817 | struct rx_se_list * list;
|
---|
| 1818 | #endif
|
---|
| 1819 | {
|
---|
| 1820 | struct rx_se_list * l;
|
---|
| 1821 | l = ((struct rx_se_list *) malloc (sizeof (*l)));
|
---|
| 1822 | if (!l)
|
---|
| 1823 | return 0;
|
---|
| 1824 | l->car = se;
|
---|
| 1825 | l->cdr = list;
|
---|
| 1826 | return l;
|
---|
| 1827 | }
|
---|
| 1828 |
|
---|
| 1829 |
|
---|
| 1830 | #ifdef __STDC__
|
---|
| 1831 | static struct rx_se_list *
|
---|
| 1832 | hash_cons_se_prog (struct rx * rx,
|
---|
| 1833 | struct rx_hash * memo,
|
---|
| 1834 | void * car, struct rx_se_list * cdr)
|
---|
| 1835 | #else
|
---|
| 1836 | static struct rx_se_list *
|
---|
| 1837 | hash_cons_se_prog (rx, memo, car, cdr)
|
---|
| 1838 | struct rx * rx;
|
---|
| 1839 | struct rx_hash * memo;
|
---|
| 1840 | void * car;
|
---|
| 1841 | struct rx_se_list * cdr;
|
---|
| 1842 | #endif
|
---|
| 1843 | {
|
---|
| 1844 | long hash = (long)car ^ (long)cdr;
|
---|
| 1845 | struct rx_se_list template;
|
---|
| 1846 |
|
---|
| 1847 | template.car = car;
|
---|
| 1848 | template.cdr = cdr;
|
---|
| 1849 | {
|
---|
| 1850 | struct rx_hash_item * it = rx_hash_store (memo, hash,
|
---|
| 1851 | (void *)&template,
|
---|
| 1852 | &se_list_hash_rules);
|
---|
| 1853 | if (!it)
|
---|
| 1854 | return 0;
|
---|
| 1855 | if (it->data == (void *)&template)
|
---|
| 1856 | {
|
---|
| 1857 | struct rx_se_list * consed;
|
---|
| 1858 | consed = (struct rx_se_list *) malloc (sizeof (*consed));
|
---|
| 1859 | *consed = template;
|
---|
| 1860 | it->data = (void *)consed;
|
---|
| 1861 | }
|
---|
| 1862 | return (struct rx_se_list *)it->data;
|
---|
| 1863 | }
|
---|
| 1864 | }
|
---|
| 1865 |
|
---|
| 1866 |
|
---|
| 1867 | #ifdef __STDC__
|
---|
| 1868 | static struct rx_se_list *
|
---|
| 1869 | hash_se_prog (struct rx * rx, struct rx_hash * memo, struct rx_se_list * prog)
|
---|
| 1870 | #else
|
---|
| 1871 | static struct rx_se_list *
|
---|
| 1872 | hash_se_prog (rx, memo, prog)
|
---|
| 1873 | struct rx * rx;
|
---|
| 1874 | struct rx_hash * memo;
|
---|
| 1875 | struct rx_se_list * prog;
|
---|
| 1876 | #endif
|
---|
| 1877 | {
|
---|
| 1878 | struct rx_se_list * answer = 0;
|
---|
| 1879 | while (prog)
|
---|
| 1880 | {
|
---|
| 1881 | answer = hash_cons_se_prog (rx, memo, prog->car, answer);
|
---|
| 1882 | if (!answer)
|
---|
| 1883 | return 0;
|
---|
| 1884 | prog = prog->cdr;
|
---|
| 1885 | }
|
---|
| 1886 | return answer;
|
---|
| 1887 | }
|
---|
| 1888 |
|
---|
| 1889 | #ifdef __STDC__
|
---|
| 1890 | static int
|
---|
| 1891 | nfa_set_cmp (void * va, void * vb)
|
---|
| 1892 | #else
|
---|
| 1893 | static int
|
---|
| 1894 | nfa_set_cmp (va, vb)
|
---|
| 1895 | void * va;
|
---|
| 1896 | void * vb;
|
---|
| 1897 | #endif
|
---|
| 1898 | {
|
---|
| 1899 | struct rx_nfa_state_set * a = (struct rx_nfa_state_set *)va;
|
---|
| 1900 | struct rx_nfa_state_set * b = (struct rx_nfa_state_set *)vb;
|
---|
| 1901 |
|
---|
| 1902 | return ((va == vb)
|
---|
| 1903 | ? 0
|
---|
| 1904 | : (!va
|
---|
| 1905 | ? -1
|
---|
| 1906 | : (!vb
|
---|
| 1907 | ? 1
|
---|
| 1908 | : (a->car->id < b->car->id
|
---|
| 1909 | ? 1
|
---|
| 1910 | : (a->car->id > b->car->id
|
---|
| 1911 | ? -1
|
---|
| 1912 | : nfa_set_cmp ((void *)a->cdr, (void *)b->cdr))))));
|
---|
| 1913 | }
|
---|
| 1914 |
|
---|
| 1915 | #ifdef __STDC__
|
---|
| 1916 | static int
|
---|
| 1917 | nfa_set_equal (void * va, void * vb)
|
---|
| 1918 | #else
|
---|
| 1919 | static int
|
---|
| 1920 | nfa_set_equal (va, vb)
|
---|
| 1921 | void * va;
|
---|
| 1922 | void * vb;
|
---|
| 1923 | #endif
|
---|
| 1924 | {
|
---|
| 1925 | return !nfa_set_cmp (va, vb);
|
---|
| 1926 | }
|
---|
| 1927 |
|
---|
| 1928 | static struct rx_hash_rules nfa_set_hash_rules =
|
---|
| 1929 | {
|
---|
| 1930 | nfa_set_equal,
|
---|
| 1931 | compiler_hash_alloc,
|
---|
| 1932 | compiler_free_hash,
|
---|
| 1933 | compiler_hash_item_alloc,
|
---|
| 1934 | compiler_free_hash_item
|
---|
| 1935 | };
|
---|
| 1936 |
|
---|
| 1937 |
|
---|
| 1938 | #ifdef __STDC__
|
---|
| 1939 | static struct rx_nfa_state_set *
|
---|
| 1940 | nfa_set_cons (struct rx * rx,
|
---|
| 1941 | struct rx_hash * memo, struct rx_nfa_state * state,
|
---|
| 1942 | struct rx_nfa_state_set * set)
|
---|
| 1943 | #else
|
---|
| 1944 | static struct rx_nfa_state_set *
|
---|
| 1945 | nfa_set_cons (rx, memo, state, set)
|
---|
| 1946 | struct rx * rx;
|
---|
| 1947 | struct rx_hash * memo;
|
---|
| 1948 | struct rx_nfa_state * state;
|
---|
| 1949 | struct rx_nfa_state_set * set;
|
---|
| 1950 | #endif
|
---|
| 1951 | {
|
---|
| 1952 | struct rx_nfa_state_set template;
|
---|
| 1953 | struct rx_hash_item * node;
|
---|
| 1954 | template.car = state;
|
---|
| 1955 | template.cdr = set;
|
---|
| 1956 | node = rx_hash_store (memo,
|
---|
| 1957 | (((long)state) >> 8) ^ (long)set,
|
---|
| 1958 | &template, &nfa_set_hash_rules);
|
---|
| 1959 | if (!node)
|
---|
| 1960 | return 0;
|
---|
| 1961 | if (node->data == &template)
|
---|
| 1962 | {
|
---|
| 1963 | struct rx_nfa_state_set * l;
|
---|
| 1964 | l = (struct rx_nfa_state_set *) malloc (sizeof (*l));
|
---|
| 1965 | node->data = (void *) l;
|
---|
| 1966 | if (!l)
|
---|
| 1967 | return 0;
|
---|
| 1968 | *l = template;
|
---|
| 1969 | }
|
---|
| 1970 | return (struct rx_nfa_state_set *)node->data;
|
---|
| 1971 | }
|
---|
| 1972 |
|
---|
| 1973 |
|
---|
| 1974 | #ifdef __STDC__
|
---|
| 1975 | static struct rx_nfa_state_set *
|
---|
| 1976 | nfa_set_enjoin (struct rx * rx,
|
---|
| 1977 | struct rx_hash * memo, struct rx_nfa_state * state,
|
---|
| 1978 | struct rx_nfa_state_set * set)
|
---|
| 1979 | #else
|
---|
| 1980 | static struct rx_nfa_state_set *
|
---|
| 1981 | nfa_set_enjoin (rx, memo, state, set)
|
---|
| 1982 | struct rx * rx;
|
---|
| 1983 | struct rx_hash * memo;
|
---|
| 1984 | struct rx_nfa_state * state;
|
---|
| 1985 | struct rx_nfa_state_set * set;
|
---|
| 1986 | #endif
|
---|
| 1987 | {
|
---|
| 1988 | if (!set || state->id < set->car->id)
|
---|
| 1989 | return nfa_set_cons (rx, memo, state, set);
|
---|
| 1990 | if (state->id == set->car->id)
|
---|
| 1991 | return set;
|
---|
| 1992 | else
|
---|
| 1993 | {
|
---|
| 1994 | struct rx_nfa_state_set * newcdr
|
---|
| 1995 | = nfa_set_enjoin (rx, memo, state, set->cdr);
|
---|
| 1996 | if (newcdr != set->cdr)
|
---|
| 1997 | set = nfa_set_cons (rx, memo, set->car, newcdr);
|
---|
| 1998 | return set;
|
---|
| 1999 | }
|
---|
| 2000 | }
|
---|
| 2001 |
|
---|
| 2002 |
|
---|
| 2003 | |
---|
| 2004 |
|
---|
| 2005 | /* This page: computing epsilon closures. The closures aren't total.
|
---|
| 2006 | * Each node's closures are partitioned according to the side effects entailed
|
---|
| 2007 | * along the epsilon edges. Return true on success.
|
---|
| 2008 | */
|
---|
| 2009 |
|
---|
| 2010 | struct eclose_frame
|
---|
| 2011 | {
|
---|
| 2012 | struct rx_se_list *prog_backwards;
|
---|
| 2013 | };
|
---|
| 2014 |
|
---|
| 2015 |
|
---|
| 2016 | #ifdef __STDC__
|
---|
| 2017 | static int
|
---|
| 2018 | eclose_node (struct rx *rx, struct rx_nfa_state *outnode,
|
---|
| 2019 | struct rx_nfa_state *node, struct eclose_frame *frame)
|
---|
| 2020 | #else
|
---|
| 2021 | static int
|
---|
| 2022 | eclose_node (rx, outnode, node, frame)
|
---|
| 2023 | struct rx *rx;
|
---|
| 2024 | struct rx_nfa_state *outnode;
|
---|
| 2025 | struct rx_nfa_state *node;
|
---|
| 2026 | struct eclose_frame *frame;
|
---|
| 2027 | #endif
|
---|
| 2028 | {
|
---|
| 2029 | struct rx_nfa_edge *e = node->edges;
|
---|
| 2030 |
|
---|
| 2031 | /* For each node, we follow all epsilon paths to build the closure.
|
---|
| 2032 | * The closure omits nodes that have only epsilon edges.
|
---|
| 2033 | * The closure is split into partial closures -- all the states in
|
---|
| 2034 | * a partial closure are reached by crossing the same list of
|
---|
| 2035 | * of side effects (though not necessarily the same path).
|
---|
| 2036 | */
|
---|
| 2037 | if (node->mark)
|
---|
| 2038 | return 1;
|
---|
| 2039 | node->mark = 1;
|
---|
| 2040 |
|
---|
| 2041 | if (node->id >= 0 || node->is_final)
|
---|
| 2042 | {
|
---|
| 2043 | struct rx_possible_future **ec;
|
---|
| 2044 | struct rx_se_list * prog_in_order
|
---|
| 2045 | = ((struct rx_se_list *)hash_se_prog (rx,
|
---|
| 2046 | &rx->se_list_memo,
|
---|
| 2047 | frame->prog_backwards));
|
---|
| 2048 | int cmp;
|
---|
| 2049 |
|
---|
| 2050 | ec = &outnode->futures;
|
---|
| 2051 |
|
---|
| 2052 | while (*ec)
|
---|
| 2053 | {
|
---|
| 2054 | cmp = se_list_cmp ((void *)(*ec)->effects, (void *)prog_in_order);
|
---|
| 2055 | if (cmp <= 0)
|
---|
| 2056 | break;
|
---|
| 2057 | ec = &(*ec)->next;
|
---|
| 2058 | }
|
---|
| 2059 | if (!*ec || (cmp < 0))
|
---|
| 2060 | {
|
---|
| 2061 | struct rx_possible_future * saved = *ec;
|
---|
| 2062 | *ec = rx_possible_future (rx, prog_in_order);
|
---|
| 2063 | (*ec)->next = saved;
|
---|
| 2064 | if (!*ec)
|
---|
| 2065 | return 0;
|
---|
| 2066 | }
|
---|
| 2067 | if (node->id >= 0)
|
---|
| 2068 | {
|
---|
| 2069 | (*ec)->destset = nfa_set_enjoin (rx, &rx->set_list_memo,
|
---|
| 2070 | node, (*ec)->destset);
|
---|
| 2071 | if (!(*ec)->destset)
|
---|
| 2072 | return 0;
|
---|
| 2073 | }
|
---|
| 2074 | }
|
---|
| 2075 |
|
---|
| 2076 | while (e)
|
---|
| 2077 | {
|
---|
| 2078 | switch (e->type)
|
---|
| 2079 | {
|
---|
| 2080 | case ne_epsilon:
|
---|
| 2081 | if (!eclose_node (rx, outnode, e->dest, frame))
|
---|
| 2082 | return 0;
|
---|
| 2083 | break;
|
---|
| 2084 | case ne_side_effect:
|
---|
| 2085 | {
|
---|
| 2086 | frame->prog_backwards = side_effect_cons (rx,
|
---|
| 2087 | e->params.side_effect,
|
---|
| 2088 | frame->prog_backwards);
|
---|
| 2089 | if (!frame->prog_backwards)
|
---|
| 2090 | return 0;
|
---|
| 2091 | if (!eclose_node (rx, outnode, e->dest, frame))
|
---|
| 2092 | return 0;
|
---|
| 2093 | {
|
---|
| 2094 | struct rx_se_list * dying = frame->prog_backwards;
|
---|
| 2095 | frame->prog_backwards = frame->prog_backwards->cdr;
|
---|
| 2096 | free ((char *)dying);
|
---|
| 2097 | }
|
---|
| 2098 | break;
|
---|
| 2099 | }
|
---|
| 2100 | default:
|
---|
| 2101 | break;
|
---|
| 2102 | }
|
---|
| 2103 | e = e->next;
|
---|
| 2104 | }
|
---|
| 2105 | node->mark = 0;
|
---|
| 2106 | return 1;
|
---|
| 2107 | }
|
---|
| 2108 |
|
---|
| 2109 |
|
---|
| 2110 | #ifdef __STDC__
|
---|
| 2111 | RX_DECL int
|
---|
| 2112 | rx_eclose_nfa (struct rx *rx)
|
---|
| 2113 | #else
|
---|
| 2114 | RX_DECL int
|
---|
| 2115 | rx_eclose_nfa (rx)
|
---|
| 2116 | struct rx *rx;
|
---|
| 2117 | #endif
|
---|
| 2118 | {
|
---|
| 2119 | struct rx_nfa_state *n = rx->nfa_states;
|
---|
| 2120 | struct eclose_frame frame;
|
---|
| 2121 | static int rx_id = 0;
|
---|
| 2122 |
|
---|
| 2123 | frame.prog_backwards = 0;
|
---|
| 2124 | rx->rx_id = rx_id++;
|
---|
| 2125 | bzero (&rx->se_list_memo, sizeof (rx->se_list_memo));
|
---|
| 2126 | bzero (&rx->set_list_memo, sizeof (rx->set_list_memo));
|
---|
| 2127 | while (n)
|
---|
| 2128 | {
|
---|
| 2129 | n->futures = 0;
|
---|
| 2130 | if (n->eclosure_needed && !eclose_node (rx, n, n, &frame))
|
---|
| 2131 | return 0;
|
---|
| 2132 | /* clear_marks (rx); */
|
---|
| 2133 | n = n->next;
|
---|
| 2134 | }
|
---|
| 2135 | return 1;
|
---|
| 2136 | }
|
---|
| 2137 |
|
---|
| 2138 |
|
---|
| 2139 | /* This deletes epsilon edges from an NFA. After running eclose_node,
|
---|
| 2140 | * we have no more need for these edges. They are removed to simplify
|
---|
| 2141 | * further operations on the NFA.
|
---|
| 2142 | */
|
---|
| 2143 |
|
---|
| 2144 | #ifdef __STDC__
|
---|
| 2145 | RX_DECL void
|
---|
| 2146 | rx_delete_epsilon_transitions (struct rx *rx)
|
---|
| 2147 | #else
|
---|
| 2148 | RX_DECL void
|
---|
| 2149 | rx_delete_epsilon_transitions (rx)
|
---|
| 2150 | struct rx *rx;
|
---|
| 2151 | #endif
|
---|
| 2152 | {
|
---|
| 2153 | struct rx_nfa_state *n = rx->nfa_states;
|
---|
| 2154 | struct rx_nfa_edge **e;
|
---|
| 2155 |
|
---|
| 2156 | while (n)
|
---|
| 2157 | {
|
---|
| 2158 | e = &n->edges;
|
---|
| 2159 | while (*e)
|
---|
| 2160 | {
|
---|
| 2161 | struct rx_nfa_edge *t;
|
---|
| 2162 | switch ((*e)->type)
|
---|
| 2163 | {
|
---|
| 2164 | case ne_epsilon:
|
---|
| 2165 | case ne_side_effect:
|
---|
| 2166 | t = *e;
|
---|
| 2167 | *e = t->next;
|
---|
| 2168 | rx_free_nfa_edge (t);
|
---|
| 2169 | break;
|
---|
| 2170 |
|
---|
| 2171 | default:
|
---|
| 2172 | e = &(*e)->next;
|
---|
| 2173 | break;
|
---|
| 2174 | }
|
---|
| 2175 | }
|
---|
| 2176 | n = n->next;
|
---|
| 2177 | }
|
---|
| 2178 | }
|
---|
| 2179 |
|
---|
| 2180 | |
---|
| 2181 |
|
---|
| 2182 | /* This page: storing the nfa in a contiguous region of memory for
|
---|
| 2183 | * subsequent conversion to a super-nfa.
|
---|
| 2184 | */
|
---|
| 2185 |
|
---|
| 2186 | /* This is for qsort on an array of nfa_states. The order
|
---|
| 2187 | * is based on state ids and goes
|
---|
| 2188 | * [0...MAX][MIN..-1] where (MAX>=0) and (MIN<0)
|
---|
| 2189 | * This way, positive ids double as array indices.
|
---|
| 2190 | */
|
---|
| 2191 |
|
---|
| 2192 | #ifdef __STDC__
|
---|
| 2193 | static int
|
---|
| 2194 | nfacmp (void * va, void * vb)
|
---|
| 2195 | #else
|
---|
| 2196 | static int
|
---|
| 2197 | nfacmp (va, vb)
|
---|
| 2198 | void * va;
|
---|
| 2199 | void * vb;
|
---|
| 2200 | #endif
|
---|
| 2201 | {
|
---|
| 2202 | struct rx_nfa_state **a = (struct rx_nfa_state **)va;
|
---|
| 2203 | struct rx_nfa_state **b = (struct rx_nfa_state **)vb;
|
---|
| 2204 | return (*a == *b /* &&&& 3.18 */
|
---|
| 2205 | ? 0
|
---|
| 2206 | : (((*a)->id < 0) == ((*b)->id < 0)
|
---|
| 2207 | ? (((*a)->id < (*b)->id) ? -1 : 1)
|
---|
| 2208 | : (((*a)->id < 0)
|
---|
| 2209 | ? 1 : -1)));
|
---|
| 2210 | }
|
---|
| 2211 |
|
---|
| 2212 | #ifdef __STDC__
|
---|
| 2213 | static int
|
---|
| 2214 | count_hash_nodes (struct rx_hash * st)
|
---|
| 2215 | #else
|
---|
| 2216 | static int
|
---|
| 2217 | count_hash_nodes (st)
|
---|
| 2218 | struct rx_hash * st;
|
---|
| 2219 | #endif
|
---|
| 2220 | {
|
---|
| 2221 | int x;
|
---|
| 2222 | int count = 0;
|
---|
| 2223 | for (x = 0; x < 13; ++x)
|
---|
| 2224 | count += ((st->children[x])
|
---|
| 2225 | ? count_hash_nodes (st->children[x])
|
---|
| 2226 | : st->bucket_size[x]);
|
---|
| 2227 |
|
---|
| 2228 | return count;
|
---|
| 2229 | }
|
---|
| 2230 |
|
---|
| 2231 |
|
---|
| 2232 | #ifdef __STDC__
|
---|
| 2233 | static void
|
---|
| 2234 | se_memo_freer (struct rx_hash_item * node)
|
---|
| 2235 | #else
|
---|
| 2236 | static void
|
---|
| 2237 | se_memo_freer (node)
|
---|
| 2238 | struct rx_hash_item * node;
|
---|
| 2239 | #endif
|
---|
| 2240 | {
|
---|
| 2241 | free ((char *)node->data);
|
---|
| 2242 | }
|
---|
| 2243 |
|
---|
| 2244 |
|
---|
| 2245 | #ifdef __STDC__
|
---|
| 2246 | static void
|
---|
| 2247 | nfa_set_freer (struct rx_hash_item * node)
|
---|
| 2248 | #else
|
---|
| 2249 | static void
|
---|
| 2250 | nfa_set_freer (node)
|
---|
| 2251 | struct rx_hash_item * node;
|
---|
| 2252 | #endif
|
---|
| 2253 | {
|
---|
| 2254 | free ((char *)node->data);
|
---|
| 2255 | }
|
---|
| 2256 |
|
---|
| 2257 |
|
---|
| 2258 | /* This copies an entire NFA into a single malloced block of memory.
|
---|
| 2259 | * Mostly this is for compatability with regex.c, though it is convenient
|
---|
| 2260 | * to have the nfa nodes in an array.
|
---|
| 2261 | */
|
---|
| 2262 |
|
---|
| 2263 | #ifdef __STDC__
|
---|
| 2264 | RX_DECL int
|
---|
| 2265 | rx_compactify_nfa (struct rx *rx,
|
---|
| 2266 | void **mem, unsigned long *size)
|
---|
| 2267 | #else
|
---|
| 2268 | RX_DECL int
|
---|
| 2269 | rx_compactify_nfa (rx, mem, size)
|
---|
| 2270 | struct rx *rx;
|
---|
| 2271 | void **mem;
|
---|
| 2272 | unsigned long *size;
|
---|
| 2273 | #endif
|
---|
| 2274 | {
|
---|
| 2275 | int total_nodec;
|
---|
| 2276 | struct rx_nfa_state *n;
|
---|
| 2277 | int edgec = 0;
|
---|
| 2278 | int eclosec = 0;
|
---|
| 2279 | int se_list_consc = count_hash_nodes (&rx->se_list_memo);
|
---|
| 2280 | int nfa_setc = count_hash_nodes (&rx->set_list_memo);
|
---|
| 2281 | unsigned long total_size;
|
---|
| 2282 |
|
---|
| 2283 | /* This takes place in two stages. First, the total size of the
|
---|
| 2284 | * nfa is computed, then structures are copied.
|
---|
| 2285 | */
|
---|
| 2286 | n = rx->nfa_states;
|
---|
| 2287 | total_nodec = 0;
|
---|
| 2288 | while (n)
|
---|
| 2289 | {
|
---|
| 2290 | struct rx_nfa_edge *e = n->edges;
|
---|
| 2291 | struct rx_possible_future *ec = n->futures;
|
---|
| 2292 | ++total_nodec;
|
---|
| 2293 | while (e)
|
---|
| 2294 | {
|
---|
| 2295 | ++edgec;
|
---|
| 2296 | e = e->next;
|
---|
| 2297 | }
|
---|
| 2298 | while (ec)
|
---|
| 2299 | {
|
---|
| 2300 | ++eclosec;
|
---|
| 2301 | ec = ec->next;
|
---|
| 2302 | }
|
---|
| 2303 | n = n->next;
|
---|
| 2304 | }
|
---|
| 2305 |
|
---|
| 2306 | total_size = (total_nodec * sizeof (struct rx_nfa_state)
|
---|
| 2307 | + edgec * rx_sizeof_bitset (rx->local_cset_size)
|
---|
| 2308 | + edgec * sizeof (struct rx_nfa_edge)
|
---|
| 2309 | + nfa_setc * sizeof (struct rx_nfa_state_set)
|
---|
| 2310 | + eclosec * sizeof (struct rx_possible_future)
|
---|
| 2311 | + se_list_consc * sizeof (struct rx_se_list)
|
---|
| 2312 | + rx->reserved);
|
---|
| 2313 |
|
---|
| 2314 | if (total_size > *size)
|
---|
| 2315 | {
|
---|
| 2316 | *mem = remalloc (*mem, total_size);
|
---|
| 2317 | if (*mem)
|
---|
| 2318 | *size = total_size;
|
---|
| 2319 | else
|
---|
| 2320 | return 0;
|
---|
| 2321 | }
|
---|
| 2322 | /* Now we've allocated the memory; this copies the NFA. */
|
---|
| 2323 | {
|
---|
| 2324 | static struct rx_nfa_state **scratch = 0;
|
---|
| 2325 | static int scratch_alloc = 0;
|
---|
| 2326 | struct rx_nfa_state *state_base = (struct rx_nfa_state *) * mem;
|
---|
| 2327 | struct rx_nfa_state *new_state = state_base;
|
---|
| 2328 | struct rx_nfa_edge *new_edge =
|
---|
| 2329 | (struct rx_nfa_edge *)
|
---|
| 2330 | ((char *) state_base + total_nodec * sizeof (struct rx_nfa_state));
|
---|
| 2331 | struct rx_se_list * new_se_list =
|
---|
| 2332 | (struct rx_se_list *)
|
---|
| 2333 | ((char *)new_edge + edgec * sizeof (struct rx_nfa_edge));
|
---|
| 2334 | struct rx_possible_future *new_close =
|
---|
| 2335 | ((struct rx_possible_future *)
|
---|
| 2336 | ((char *) new_se_list
|
---|
| 2337 | + se_list_consc * sizeof (struct rx_se_list)));
|
---|
| 2338 | struct rx_nfa_state_set * new_nfa_set =
|
---|
| 2339 | ((struct rx_nfa_state_set *)
|
---|
| 2340 | ((char *)new_close + eclosec * sizeof (struct rx_possible_future)));
|
---|
| 2341 | char *new_bitset =
|
---|
| 2342 | ((char *) new_nfa_set + nfa_setc * sizeof (struct rx_nfa_state_set));
|
---|
| 2343 | int x;
|
---|
| 2344 | struct rx_nfa_state *n;
|
---|
| 2345 |
|
---|
| 2346 | if (scratch_alloc < total_nodec)
|
---|
| 2347 | {
|
---|
| 2348 | scratch = ((struct rx_nfa_state **)
|
---|
| 2349 | remalloc (scratch, total_nodec * sizeof (*scratch)));
|
---|
| 2350 | if (scratch)
|
---|
| 2351 | scratch_alloc = total_nodec;
|
---|
| 2352 | else
|
---|
| 2353 | {
|
---|
| 2354 | scratch_alloc = 0;
|
---|
| 2355 | return 0;
|
---|
| 2356 | }
|
---|
| 2357 | }
|
---|
| 2358 |
|
---|
| 2359 | for (x = 0, n = rx->nfa_states; n; n = n->next)
|
---|
| 2360 | scratch[x++] = n;
|
---|
| 2361 |
|
---|
| 2362 | qsort (scratch, total_nodec,
|
---|
| 2363 | sizeof (struct rx_nfa_state *), (int (*)())nfacmp);
|
---|
| 2364 |
|
---|
| 2365 | for (x = 0; x < total_nodec; ++x)
|
---|
| 2366 | {
|
---|
| 2367 | struct rx_possible_future *eclose = scratch[x]->futures;
|
---|
| 2368 | struct rx_nfa_edge *edge = scratch[x]->edges;
|
---|
| 2369 | struct rx_nfa_state *cn = new_state++;
|
---|
| 2370 | cn->futures = 0;
|
---|
| 2371 | cn->edges = 0;
|
---|
| 2372 | cn->next = (x == total_nodec - 1) ? 0 : (cn + 1);
|
---|
| 2373 | cn->id = scratch[x]->id;
|
---|
| 2374 | cn->is_final = scratch[x]->is_final;
|
---|
| 2375 | cn->is_start = scratch[x]->is_start;
|
---|
| 2376 | cn->mark = 0;
|
---|
| 2377 | while (edge)
|
---|
| 2378 | {
|
---|
| 2379 | int indx = (edge->dest->id < 0
|
---|
| 2380 | ? (total_nodec + edge->dest->id)
|
---|
| 2381 | : edge->dest->id);
|
---|
| 2382 | struct rx_nfa_edge *e = new_edge++;
|
---|
| 2383 | rx_Bitset cset = (rx_Bitset) new_bitset;
|
---|
| 2384 | new_bitset += rx_sizeof_bitset (rx->local_cset_size);
|
---|
| 2385 | rx_bitset_null (rx->local_cset_size, cset);
|
---|
| 2386 | rx_bitset_union (rx->local_cset_size, cset, edge->params.cset);
|
---|
| 2387 | e->next = cn->edges;
|
---|
| 2388 | cn->edges = e;
|
---|
| 2389 | e->type = edge->type;
|
---|
| 2390 | e->dest = state_base + indx;
|
---|
| 2391 | e->params.cset = cset;
|
---|
| 2392 | edge = edge->next;
|
---|
| 2393 | }
|
---|
| 2394 | while (eclose)
|
---|
| 2395 | {
|
---|
| 2396 | struct rx_possible_future *ec = new_close++;
|
---|
| 2397 | struct rx_hash_item * sp;
|
---|
| 2398 | struct rx_se_list ** sepos;
|
---|
| 2399 | struct rx_se_list * sesrc;
|
---|
| 2400 | struct rx_nfa_state_set * destlst;
|
---|
| 2401 | struct rx_nfa_state_set ** destpos;
|
---|
| 2402 | ec->next = cn->futures;
|
---|
| 2403 | cn->futures = ec;
|
---|
| 2404 | for (sepos = &ec->effects, sesrc = eclose->effects;
|
---|
| 2405 | sesrc;
|
---|
| 2406 | sesrc = sesrc->cdr, sepos = &(*sepos)->cdr)
|
---|
| 2407 | {
|
---|
| 2408 | sp = rx_hash_find (&rx->se_list_memo,
|
---|
| 2409 | (long)sesrc->car ^ (long)sesrc->cdr,
|
---|
| 2410 | sesrc, &se_list_hash_rules);
|
---|
| 2411 | if (sp->binding)
|
---|
| 2412 | {
|
---|
| 2413 | sesrc = (struct rx_se_list *)sp->binding;
|
---|
| 2414 | break;
|
---|
| 2415 | }
|
---|
| 2416 | *new_se_list = *sesrc;
|
---|
| 2417 | sp->binding = (void *)new_se_list;
|
---|
| 2418 | *sepos = new_se_list;
|
---|
| 2419 | ++new_se_list;
|
---|
| 2420 | }
|
---|
| 2421 | *sepos = sesrc;
|
---|
| 2422 | for (destpos = &ec->destset, destlst = eclose->destset;
|
---|
| 2423 | destlst;
|
---|
| 2424 | destpos = &(*destpos)->cdr, destlst = destlst->cdr)
|
---|
| 2425 | {
|
---|
| 2426 | sp = rx_hash_find (&rx->set_list_memo,
|
---|
| 2427 | ((((long)destlst->car) >> 8)
|
---|
| 2428 | ^ (long)destlst->cdr),
|
---|
| 2429 | destlst, &nfa_set_hash_rules);
|
---|
| 2430 | if (sp->binding)
|
---|
| 2431 | {
|
---|
| 2432 | destlst = (struct rx_nfa_state_set *)sp->binding;
|
---|
| 2433 | break;
|
---|
| 2434 | }
|
---|
| 2435 | *new_nfa_set = *destlst;
|
---|
| 2436 | new_nfa_set->car = state_base + destlst->car->id;
|
---|
| 2437 | sp->binding = (void *)new_nfa_set;
|
---|
| 2438 | *destpos = new_nfa_set;
|
---|
| 2439 | ++new_nfa_set;
|
---|
| 2440 | }
|
---|
| 2441 | *destpos = destlst;
|
---|
| 2442 | eclose = eclose->next;
|
---|
| 2443 | }
|
---|
| 2444 | }
|
---|
| 2445 | }
|
---|
| 2446 | rx_free_hash_table (&rx->se_list_memo, se_memo_freer, &se_list_hash_rules);
|
---|
| 2447 | bzero (&rx->se_list_memo, sizeof (rx->se_list_memo));
|
---|
| 2448 | rx_free_hash_table (&rx->set_list_memo, nfa_set_freer, &nfa_set_hash_rules);
|
---|
| 2449 | bzero (&rx->set_list_memo, sizeof (rx->set_list_memo));
|
---|
| 2450 |
|
---|
| 2451 | rx_free_nfa (rx);
|
---|
| 2452 | rx->nfa_states = (struct rx_nfa_state *)*mem;
|
---|
| 2453 | return 1;
|
---|
| 2454 | }
|
---|
| 2455 |
|
---|
| 2456 | |
---|
| 2457 |
|
---|
| 2458 | /* The functions in the next several pages define the lazy-NFA-conversion used
|
---|
| 2459 | * by matchers. The input to this construction is an NFA such as
|
---|
| 2460 | * is built by compactify_nfa (rx.c). The output is the superNFA.
|
---|
| 2461 | */
|
---|
| 2462 |
|
---|
| 2463 | /* Match engines can use arbitrary values for opcodes. So, the parse tree
|
---|
| 2464 | * is built using instructions names (enum rx_opcode), but the superstate
|
---|
| 2465 | * nfa is populated with mystery opcodes (void *).
|
---|
| 2466 | *
|
---|
| 2467 | * For convenience, here is an id table. The opcodes are == to their inxs
|
---|
| 2468 | *
|
---|
| 2469 | * The lables in re_search_2 would make good values for instructions.
|
---|
| 2470 | */
|
---|
| 2471 |
|
---|
| 2472 | void * rx_id_instruction_table[rx_num_instructions] =
|
---|
| 2473 | {
|
---|
| 2474 | (void *) rx_backtrack_point,
|
---|
| 2475 | (void *) rx_do_side_effects,
|
---|
| 2476 | (void *) rx_cache_miss,
|
---|
| 2477 | (void *) rx_next_char,
|
---|
| 2478 | (void *) rx_backtrack,
|
---|
| 2479 | (void *) rx_error_inx
|
---|
| 2480 | };
|
---|
| 2481 |
|
---|
| 2482 | |
---|
| 2483 |
|
---|
| 2484 |
|
---|
| 2485 | /* Memory mgt. for superstate graphs. */
|
---|
| 2486 |
|
---|
| 2487 | #ifdef __STDC__
|
---|
| 2488 | static char *
|
---|
| 2489 | rx_cache_malloc (struct rx_cache * cache, int bytes)
|
---|
| 2490 | #else
|
---|
| 2491 | static char *
|
---|
| 2492 | rx_cache_malloc (cache, bytes)
|
---|
| 2493 | struct rx_cache * cache;
|
---|
| 2494 | int bytes;
|
---|
| 2495 | #endif
|
---|
| 2496 | {
|
---|
| 2497 | while (cache->bytes_left < bytes)
|
---|
| 2498 | {
|
---|
| 2499 | if (cache->memory_pos)
|
---|
| 2500 | cache->memory_pos = cache->memory_pos->next;
|
---|
| 2501 | if (!cache->memory_pos)
|
---|
| 2502 | {
|
---|
| 2503 | cache->morecore (cache);
|
---|
| 2504 | if (!cache->memory_pos)
|
---|
| 2505 | return 0;
|
---|
| 2506 | }
|
---|
| 2507 | cache->bytes_left = cache->memory_pos->bytes;
|
---|
| 2508 | cache->memory_addr = ((char *)cache->memory_pos
|
---|
| 2509 | + sizeof (struct rx_blocklist));
|
---|
| 2510 | }
|
---|
| 2511 | cache->bytes_left -= bytes;
|
---|
| 2512 | {
|
---|
| 2513 | char * addr = cache->memory_addr;
|
---|
| 2514 | cache->memory_addr += bytes;
|
---|
| 2515 | return addr;
|
---|
| 2516 | }
|
---|
| 2517 | }
|
---|
| 2518 |
|
---|
| 2519 | #ifdef __STDC__
|
---|
| 2520 | static void
|
---|
| 2521 | rx_cache_free (struct rx_cache * cache,
|
---|
| 2522 | struct rx_freelist ** freelist, char * mem)
|
---|
| 2523 | #else
|
---|
| 2524 | static void
|
---|
| 2525 | rx_cache_free (cache, freelist, mem)
|
---|
| 2526 | struct rx_cache * cache;
|
---|
| 2527 | struct rx_freelist ** freelist;
|
---|
| 2528 | char * mem;
|
---|
| 2529 | #endif
|
---|
| 2530 | {
|
---|
| 2531 | struct rx_freelist * it = (struct rx_freelist *)mem;
|
---|
| 2532 | it->next = *freelist;
|
---|
| 2533 | *freelist = it;
|
---|
| 2534 | }
|
---|
| 2535 |
|
---|
| 2536 |
|
---|
| 2537 | /* The partially instantiated superstate graph has a transition
|
---|
| 2538 | * table at every node. There is one entry for every character.
|
---|
| 2539 | * This fills in the transition for a set.
|
---|
| 2540 | */
|
---|
| 2541 | #ifdef __STDC__
|
---|
| 2542 | static void
|
---|
| 2543 | install_transition (struct rx_superstate *super,
|
---|
| 2544 | struct rx_inx *answer, rx_Bitset trcset)
|
---|
| 2545 | #else
|
---|
| 2546 | static void
|
---|
| 2547 | install_transition (super, answer, trcset)
|
---|
| 2548 | struct rx_superstate *super;
|
---|
| 2549 | struct rx_inx *answer;
|
---|
| 2550 | rx_Bitset trcset;
|
---|
| 2551 | #endif
|
---|
| 2552 | {
|
---|
| 2553 | struct rx_inx * transitions = super->transitions;
|
---|
| 2554 | int chr;
|
---|
| 2555 | for (chr = 0; chr < 256; )
|
---|
| 2556 | if (!*trcset)
|
---|
| 2557 | {
|
---|
| 2558 | ++trcset;
|
---|
| 2559 | chr += 32;
|
---|
| 2560 | }
|
---|
| 2561 | else
|
---|
| 2562 | {
|
---|
| 2563 | RX_subset sub = *trcset;
|
---|
| 2564 | RX_subset mask = 1;
|
---|
| 2565 | int bound = chr + 32;
|
---|
| 2566 | while (chr < bound)
|
---|
| 2567 | {
|
---|
| 2568 | if (sub & mask)
|
---|
| 2569 | transitions [chr] = *answer;
|
---|
| 2570 | ++chr;
|
---|
| 2571 | mask <<= 1;
|
---|
| 2572 | }
|
---|
| 2573 | ++trcset;
|
---|
| 2574 | }
|
---|
| 2575 | }
|
---|
| 2576 |
|
---|
| 2577 |
|
---|
| 2578 | #ifdef __STDC__
|
---|
| 2579 | static int
|
---|
| 2580 | qlen (struct rx_superstate * q)
|
---|
| 2581 | #else
|
---|
| 2582 | static int
|
---|
| 2583 | qlen (q)
|
---|
| 2584 | struct rx_superstate * q;
|
---|
| 2585 | #endif
|
---|
| 2586 | {
|
---|
| 2587 | int count = 1;
|
---|
| 2588 | struct rx_superstate * it;
|
---|
| 2589 | if (!q)
|
---|
| 2590 | return 0;
|
---|
| 2591 | for (it = q->next_recyclable; it != q; it = it->next_recyclable)
|
---|
| 2592 | ++count;
|
---|
| 2593 | return count;
|
---|
| 2594 | }
|
---|
| 2595 |
|
---|
| 2596 | #ifdef __STDC__
|
---|
| 2597 | static void
|
---|
| 2598 | check_cache (struct rx_cache * cache)
|
---|
| 2599 | #else
|
---|
| 2600 | static void
|
---|
| 2601 | check_cache (cache)
|
---|
| 2602 | struct rx_cache * cache;
|
---|
| 2603 | #endif
|
---|
| 2604 | {
|
---|
| 2605 | struct rx_cache * you_fucked_up = 0;
|
---|
| 2606 | int total = cache->superstates;
|
---|
| 2607 | int semi = cache->semifree_superstates;
|
---|
| 2608 | if (semi != qlen (cache->semifree_superstate))
|
---|
| 2609 | check_cache (you_fucked_up);
|
---|
| 2610 | if ((total - semi) != qlen (cache->lru_superstate))
|
---|
| 2611 | check_cache (you_fucked_up);
|
---|
| 2612 | }
|
---|
| 2613 |
|
---|
| 2614 | /* When a superstate is old and neglected, it can enter a
|
---|
| 2615 | * semi-free state. A semi-free state is slated to die.
|
---|
| 2616 | * Incoming transitions to a semi-free state are re-written
|
---|
| 2617 | * to cause an (interpreted) fault when they are taken.
|
---|
| 2618 | * The fault handler revives the semi-free state, patches
|
---|
| 2619 | * incoming transitions back to normal, and continues.
|
---|
| 2620 | *
|
---|
| 2621 | * The idea is basicly to free in two stages, aborting
|
---|
| 2622 | * between the two if the state turns out to be useful again.
|
---|
| 2623 | * When a free is aborted, the rescued superstate is placed
|
---|
| 2624 | * in the most-favored slot to maximize the time until it
|
---|
| 2625 | * is next semi-freed.
|
---|
| 2626 | */
|
---|
| 2627 |
|
---|
| 2628 | #ifdef __STDC__
|
---|
| 2629 | static void
|
---|
| 2630 | semifree_superstate (struct rx_cache * cache)
|
---|
| 2631 | #else
|
---|
| 2632 | static void
|
---|
| 2633 | semifree_superstate (cache)
|
---|
| 2634 | struct rx_cache * cache;
|
---|
| 2635 | #endif
|
---|
| 2636 | {
|
---|
| 2637 | int disqualified = cache->semifree_superstates;
|
---|
| 2638 | if (disqualified == cache->superstates)
|
---|
| 2639 | return;
|
---|
| 2640 | while (cache->lru_superstate->locks)
|
---|
| 2641 | {
|
---|
| 2642 | cache->lru_superstate = cache->lru_superstate->next_recyclable;
|
---|
| 2643 | ++disqualified;
|
---|
| 2644 | if (disqualified == cache->superstates)
|
---|
| 2645 | return;
|
---|
| 2646 | }
|
---|
| 2647 | {
|
---|
| 2648 | struct rx_superstate * it = cache->lru_superstate;
|
---|
| 2649 | it->next_recyclable->prev_recyclable = it->prev_recyclable;
|
---|
| 2650 | it->prev_recyclable->next_recyclable = it->next_recyclable;
|
---|
| 2651 | cache->lru_superstate = (it == it->next_recyclable
|
---|
| 2652 | ? 0
|
---|
| 2653 | : it->next_recyclable);
|
---|
| 2654 | if (!cache->semifree_superstate)
|
---|
| 2655 | {
|
---|
| 2656 | cache->semifree_superstate = it;
|
---|
| 2657 | it->next_recyclable = it;
|
---|
| 2658 | it->prev_recyclable = it;
|
---|
| 2659 | }
|
---|
| 2660 | else
|
---|
| 2661 | {
|
---|
| 2662 | it->prev_recyclable = cache->semifree_superstate->prev_recyclable;
|
---|
| 2663 | it->next_recyclable = cache->semifree_superstate;
|
---|
| 2664 | it->prev_recyclable->next_recyclable = it;
|
---|
| 2665 | it->next_recyclable->prev_recyclable = it;
|
---|
| 2666 | }
|
---|
| 2667 | {
|
---|
| 2668 | struct rx_distinct_future *df;
|
---|
| 2669 | it->is_semifree = 1;
|
---|
| 2670 | ++cache->semifree_superstates;
|
---|
| 2671 | df = it->transition_refs;
|
---|
| 2672 | if (df)
|
---|
| 2673 | {
|
---|
| 2674 | df->prev_same_dest->next_same_dest = 0;
|
---|
| 2675 | for (df = it->transition_refs; df; df = df->next_same_dest)
|
---|
| 2676 | {
|
---|
| 2677 | df->future_frame.inx = cache->instruction_table[rx_cache_miss];
|
---|
| 2678 | df->future_frame.data = 0;
|
---|
| 2679 | df->future_frame.data_2 = (void *) df;
|
---|
| 2680 | /* If there are any NEXT-CHAR instruction frames that
|
---|
| 2681 | * refer to this state, we convert them to CACHE-MISS frames.
|
---|
| 2682 | */
|
---|
| 2683 | if (!df->effects
|
---|
| 2684 | && (df->edge->options->next_same_super_edge[0]
|
---|
| 2685 | == df->edge->options))
|
---|
| 2686 | install_transition (df->present, &df->future_frame,
|
---|
| 2687 | df->edge->cset);
|
---|
| 2688 | }
|
---|
| 2689 | df = it->transition_refs;
|
---|
| 2690 | df->prev_same_dest->next_same_dest = df;
|
---|
| 2691 | }
|
---|
| 2692 | }
|
---|
| 2693 | }
|
---|
| 2694 | }
|
---|
| 2695 |
|
---|
| 2696 |
|
---|
| 2697 | #ifdef __STDC__
|
---|
| 2698 | static void
|
---|
| 2699 | refresh_semifree_superstate (struct rx_cache * cache,
|
---|
| 2700 | struct rx_superstate * super)
|
---|
| 2701 | #else
|
---|
| 2702 | static void
|
---|
| 2703 | refresh_semifree_superstate (cache, super)
|
---|
| 2704 | struct rx_cache * cache;
|
---|
| 2705 | struct rx_superstate * super;
|
---|
| 2706 | #endif
|
---|
| 2707 | {
|
---|
| 2708 | struct rx_distinct_future *df;
|
---|
| 2709 |
|
---|
| 2710 | if (super->transition_refs)
|
---|
| 2711 | {
|
---|
| 2712 | super->transition_refs->prev_same_dest->next_same_dest = 0;
|
---|
| 2713 | for (df = super->transition_refs; df; df = df->next_same_dest)
|
---|
| 2714 | {
|
---|
| 2715 | df->future_frame.inx = cache->instruction_table[rx_next_char];
|
---|
| 2716 | df->future_frame.data = (void *) super->transitions;
|
---|
| 2717 | /* CACHE-MISS instruction frames that refer to this state,
|
---|
| 2718 | * must be converted to NEXT-CHAR frames.
|
---|
| 2719 | */
|
---|
| 2720 | if (!df->effects
|
---|
| 2721 | && (df->edge->options->next_same_super_edge[0]
|
---|
| 2722 | == df->edge->options))
|
---|
| 2723 | install_transition (df->present, &df->future_frame,
|
---|
| 2724 | df->edge->cset);
|
---|
| 2725 | }
|
---|
| 2726 | super->transition_refs->prev_same_dest->next_same_dest
|
---|
| 2727 | = super->transition_refs;
|
---|
| 2728 | }
|
---|
| 2729 | if (cache->semifree_superstate == super)
|
---|
| 2730 | cache->semifree_superstate = (super->prev_recyclable == super
|
---|
| 2731 | ? 0
|
---|
| 2732 | : super->prev_recyclable);
|
---|
| 2733 | super->next_recyclable->prev_recyclable = super->prev_recyclable;
|
---|
| 2734 | super->prev_recyclable->next_recyclable = super->next_recyclable;
|
---|
| 2735 |
|
---|
| 2736 | if (!cache->lru_superstate)
|
---|
| 2737 | (cache->lru_superstate
|
---|
| 2738 | = super->next_recyclable
|
---|
| 2739 | = super->prev_recyclable
|
---|
| 2740 | = super);
|
---|
| 2741 | else
|
---|
| 2742 | {
|
---|
| 2743 | super->next_recyclable = cache->lru_superstate;
|
---|
| 2744 | super->prev_recyclable = cache->lru_superstate->prev_recyclable;
|
---|
| 2745 | super->next_recyclable->prev_recyclable = super;
|
---|
| 2746 | super->prev_recyclable->next_recyclable = super;
|
---|
| 2747 | }
|
---|
| 2748 | super->is_semifree = 0;
|
---|
| 2749 | --cache->semifree_superstates;
|
---|
| 2750 | }
|
---|
| 2751 |
|
---|
| 2752 | #ifdef __STDC__
|
---|
| 2753 | static void
|
---|
| 2754 | rx_refresh_this_superstate (struct rx_cache * cache, struct rx_superstate * superstate)
|
---|
| 2755 | #else
|
---|
| 2756 | static void
|
---|
| 2757 | rx_refresh_this_superstate (cache, superstate)
|
---|
| 2758 | struct rx_cache * cache;
|
---|
| 2759 | struct rx_superstate * superstate;
|
---|
| 2760 | #endif
|
---|
| 2761 | {
|
---|
| 2762 | if (superstate->is_semifree)
|
---|
| 2763 | refresh_semifree_superstate (cache, superstate);
|
---|
| 2764 | else if (cache->lru_superstate == superstate)
|
---|
| 2765 | cache->lru_superstate = superstate->next_recyclable;
|
---|
| 2766 | else if (superstate != cache->lru_superstate->prev_recyclable)
|
---|
| 2767 | {
|
---|
| 2768 | superstate->next_recyclable->prev_recyclable
|
---|
| 2769 | = superstate->prev_recyclable;
|
---|
| 2770 | superstate->prev_recyclable->next_recyclable
|
---|
| 2771 | = superstate->next_recyclable;
|
---|
| 2772 | superstate->next_recyclable = cache->lru_superstate;
|
---|
| 2773 | superstate->prev_recyclable = cache->lru_superstate->prev_recyclable;
|
---|
| 2774 | superstate->next_recyclable->prev_recyclable = superstate;
|
---|
| 2775 | superstate->prev_recyclable->next_recyclable = superstate;
|
---|
| 2776 | }
|
---|
| 2777 | }
|
---|
| 2778 |
|
---|
| 2779 | #ifdef __STDC__
|
---|
| 2780 | static void
|
---|
| 2781 | release_superset_low (struct rx_cache * cache,
|
---|
| 2782 | struct rx_superset *set)
|
---|
| 2783 | #else
|
---|
| 2784 | static void
|
---|
| 2785 | release_superset_low (cache, set)
|
---|
| 2786 | struct rx_cache * cache;
|
---|
| 2787 | struct rx_superset *set;
|
---|
| 2788 | #endif
|
---|
| 2789 | {
|
---|
| 2790 | if (!--set->refs)
|
---|
| 2791 | {
|
---|
| 2792 | if (set->cdr)
|
---|
| 2793 | release_superset_low (cache, set->cdr);
|
---|
| 2794 |
|
---|
| 2795 | set->starts_for = 0;
|
---|
| 2796 |
|
---|
| 2797 | rx_hash_free
|
---|
| 2798 | (rx_hash_find
|
---|
| 2799 | (&cache->superset_table,
|
---|
| 2800 | (unsigned long)set->car ^ set->id ^ (unsigned long)set->cdr,
|
---|
| 2801 | (void *)set,
|
---|
| 2802 | &cache->superset_hash_rules),
|
---|
| 2803 | &cache->superset_hash_rules);
|
---|
| 2804 | rx_cache_free (cache, &cache->free_supersets, (char *)set);
|
---|
| 2805 | }
|
---|
| 2806 | }
|
---|
| 2807 |
|
---|
| 2808 | #ifdef __STDC__
|
---|
| 2809 | RX_DECL void
|
---|
| 2810 | rx_release_superset (struct rx *rx,
|
---|
| 2811 | struct rx_superset *set)
|
---|
| 2812 | #else
|
---|
| 2813 | RX_DECL void
|
---|
| 2814 | rx_release_superset (rx, set)
|
---|
| 2815 | struct rx *rx;
|
---|
| 2816 | struct rx_superset *set;
|
---|
| 2817 | #endif
|
---|
| 2818 | {
|
---|
| 2819 | release_superset_low (rx->cache, set);
|
---|
| 2820 | }
|
---|
| 2821 |
|
---|
| 2822 | /* This tries to add a new superstate to the superstate freelist.
|
---|
| 2823 | * It might, as a result, free some edge pieces or hash tables.
|
---|
| 2824 | * If nothing can be freed because too many locks are being held, fail.
|
---|
| 2825 | */
|
---|
| 2826 |
|
---|
| 2827 | #ifdef __STDC__
|
---|
| 2828 | static int
|
---|
| 2829 | rx_really_free_superstate (struct rx_cache * cache)
|
---|
| 2830 | #else
|
---|
| 2831 | static int
|
---|
| 2832 | rx_really_free_superstate (cache)
|
---|
| 2833 | struct rx_cache * cache;
|
---|
| 2834 | #endif
|
---|
| 2835 | {
|
---|
| 2836 | int locked_superstates = 0;
|
---|
| 2837 | struct rx_superstate * it;
|
---|
| 2838 |
|
---|
| 2839 | if (!cache->superstates)
|
---|
| 2840 | return 0;
|
---|
| 2841 |
|
---|
| 2842 | {
|
---|
| 2843 | /* This is a total guess. The idea is that we should expect as
|
---|
| 2844 | * many misses as we've recently experienced. I.e., cache->misses
|
---|
| 2845 | * should be the same as cache->semifree_superstates.
|
---|
| 2846 | */
|
---|
| 2847 | while ((cache->hits + cache->misses) > cache->superstates_allowed)
|
---|
| 2848 | {
|
---|
| 2849 | cache->hits >>= 1;
|
---|
| 2850 | cache->misses >>= 1;
|
---|
| 2851 | }
|
---|
| 2852 | if ( ((cache->hits + cache->misses) * cache->semifree_superstates)
|
---|
| 2853 | < (cache->superstates * cache->misses))
|
---|
| 2854 | {
|
---|
| 2855 | semifree_superstate (cache);
|
---|
| 2856 | semifree_superstate (cache);
|
---|
| 2857 | }
|
---|
| 2858 | }
|
---|
| 2859 |
|
---|
| 2860 | while (cache->semifree_superstate && cache->semifree_superstate->locks)
|
---|
| 2861 | {
|
---|
| 2862 | refresh_semifree_superstate (cache, cache->semifree_superstate);
|
---|
| 2863 | ++locked_superstates;
|
---|
| 2864 | if (locked_superstates == cache->superstates)
|
---|
| 2865 | return 0;
|
---|
| 2866 | }
|
---|
| 2867 |
|
---|
| 2868 | if (cache->semifree_superstate)
|
---|
| 2869 | {
|
---|
| 2870 | it = cache->semifree_superstate;
|
---|
| 2871 | it->next_recyclable->prev_recyclable = it->prev_recyclable;
|
---|
| 2872 | it->prev_recyclable->next_recyclable = it->next_recyclable;
|
---|
| 2873 | cache->semifree_superstate = ((it == it->next_recyclable)
|
---|
| 2874 | ? 0
|
---|
| 2875 | : it->next_recyclable);
|
---|
| 2876 | --cache->semifree_superstates;
|
---|
| 2877 | }
|
---|
| 2878 | else
|
---|
| 2879 | {
|
---|
| 2880 | while (cache->lru_superstate->locks)
|
---|
| 2881 | {
|
---|
| 2882 | cache->lru_superstate = cache->lru_superstate->next_recyclable;
|
---|
| 2883 | ++locked_superstates;
|
---|
| 2884 | if (locked_superstates == cache->superstates)
|
---|
| 2885 | return 0;
|
---|
| 2886 | }
|
---|
| 2887 | it = cache->lru_superstate;
|
---|
| 2888 | it->next_recyclable->prev_recyclable = it->prev_recyclable;
|
---|
| 2889 | it->prev_recyclable->next_recyclable = it->next_recyclable;
|
---|
| 2890 | cache->lru_superstate = ((it == it->next_recyclable)
|
---|
| 2891 | ? 0
|
---|
| 2892 | : it->next_recyclable);
|
---|
| 2893 | }
|
---|
| 2894 |
|
---|
| 2895 | if (it->transition_refs)
|
---|
| 2896 | {
|
---|
| 2897 | struct rx_distinct_future *df;
|
---|
| 2898 | for (df = it->transition_refs,
|
---|
| 2899 | df->prev_same_dest->next_same_dest = 0;
|
---|
| 2900 | df;
|
---|
| 2901 | df = df->next_same_dest)
|
---|
| 2902 | {
|
---|
| 2903 | df->future_frame.inx = cache->instruction_table[rx_cache_miss];
|
---|
| 2904 | df->future_frame.data = 0;
|
---|
| 2905 | df->future_frame.data_2 = (void *) df;
|
---|
| 2906 | df->future = 0;
|
---|
| 2907 | }
|
---|
| 2908 | it->transition_refs->prev_same_dest->next_same_dest =
|
---|
| 2909 | it->transition_refs;
|
---|
| 2910 | }
|
---|
| 2911 | {
|
---|
| 2912 | struct rx_super_edge *tc = it->edges;
|
---|
| 2913 | while (tc)
|
---|
| 2914 | {
|
---|
| 2915 | struct rx_distinct_future * df;
|
---|
| 2916 | struct rx_super_edge *tct = tc->next;
|
---|
| 2917 | df = tc->options;
|
---|
| 2918 | df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
|
---|
| 2919 | while (df)
|
---|
| 2920 | {
|
---|
| 2921 | struct rx_distinct_future *dft = df;
|
---|
| 2922 | df = df->next_same_super_edge[0];
|
---|
| 2923 |
|
---|
| 2924 |
|
---|
| 2925 | if (dft->future && dft->future->transition_refs == dft)
|
---|
| 2926 | {
|
---|
| 2927 | dft->future->transition_refs = dft->next_same_dest;
|
---|
| 2928 | if (dft->future->transition_refs == dft)
|
---|
| 2929 | dft->future->transition_refs = 0;
|
---|
| 2930 | }
|
---|
| 2931 | dft->next_same_dest->prev_same_dest = dft->prev_same_dest;
|
---|
| 2932 | dft->prev_same_dest->next_same_dest = dft->next_same_dest;
|
---|
| 2933 | rx_cache_free (cache, &cache->free_discernable_futures,
|
---|
| 2934 | (char *)dft);
|
---|
| 2935 | }
|
---|
| 2936 | rx_cache_free (cache, &cache->free_transition_classes, (char *)tc);
|
---|
| 2937 | tc = tct;
|
---|
| 2938 | }
|
---|
| 2939 | }
|
---|
| 2940 |
|
---|
| 2941 | if (it->contents->superstate == it)
|
---|
| 2942 | it->contents->superstate = 0;
|
---|
| 2943 | release_superset_low (cache, it->contents);
|
---|
| 2944 | rx_cache_free (cache, &cache->free_superstates, (char *)it);
|
---|
| 2945 | --cache->superstates;
|
---|
| 2946 | return 1;
|
---|
| 2947 | }
|
---|
| 2948 |
|
---|
| 2949 | #ifdef __STDC__
|
---|
| 2950 | static char *
|
---|
| 2951 | rx_cache_get (struct rx_cache * cache,
|
---|
| 2952 | struct rx_freelist ** freelist)
|
---|
| 2953 | #else
|
---|
| 2954 | static char *
|
---|
| 2955 | rx_cache_get (cache, freelist)
|
---|
| 2956 | struct rx_cache * cache;
|
---|
| 2957 | struct rx_freelist ** freelist;
|
---|
| 2958 | #endif
|
---|
| 2959 | {
|
---|
| 2960 | while (!*freelist && rx_really_free_superstate (cache))
|
---|
| 2961 | ;
|
---|
| 2962 | if (!*freelist)
|
---|
| 2963 | return 0;
|
---|
| 2964 | {
|
---|
| 2965 | struct rx_freelist * it = *freelist;
|
---|
| 2966 | *freelist = it->next;
|
---|
| 2967 | return (char *)it;
|
---|
| 2968 | }
|
---|
| 2969 | }
|
---|
| 2970 |
|
---|
| 2971 | #ifdef __STDC__
|
---|
| 2972 | static char *
|
---|
| 2973 | rx_cache_malloc_or_get (struct rx_cache * cache,
|
---|
| 2974 | struct rx_freelist ** freelist, int bytes)
|
---|
| 2975 | #else
|
---|
| 2976 | static char *
|
---|
| 2977 | rx_cache_malloc_or_get (cache, freelist, bytes)
|
---|
| 2978 | struct rx_cache * cache;
|
---|
| 2979 | struct rx_freelist ** freelist;
|
---|
| 2980 | int bytes;
|
---|
| 2981 | #endif
|
---|
| 2982 | {
|
---|
| 2983 | if (!*freelist)
|
---|
| 2984 | {
|
---|
| 2985 | char * answer = rx_cache_malloc (cache, bytes);
|
---|
| 2986 | if (answer)
|
---|
| 2987 | return answer;
|
---|
| 2988 | }
|
---|
| 2989 |
|
---|
| 2990 | return rx_cache_get (cache, freelist);
|
---|
| 2991 | }
|
---|
| 2992 |
|
---|
| 2993 | #ifdef __STDC__
|
---|
| 2994 | static char *
|
---|
| 2995 | rx_cache_get_superstate (struct rx_cache * cache)
|
---|
| 2996 | #else
|
---|
| 2997 | static char *
|
---|
| 2998 | rx_cache_get_superstate (cache)
|
---|
| 2999 | struct rx_cache * cache;
|
---|
| 3000 | #endif
|
---|
| 3001 | {
|
---|
| 3002 | char * answer;
|
---|
| 3003 | int bytes = ( sizeof (struct rx_superstate)
|
---|
| 3004 | + cache->local_cset_size * sizeof (struct rx_inx));
|
---|
| 3005 | if (!cache->free_superstates
|
---|
| 3006 | && (cache->superstates < cache->superstates_allowed))
|
---|
| 3007 | {
|
---|
| 3008 | answer = rx_cache_malloc (cache, bytes);
|
---|
| 3009 | if (answer)
|
---|
| 3010 | {
|
---|
| 3011 | ++cache->superstates;
|
---|
| 3012 | return answer;
|
---|
| 3013 | }
|
---|
| 3014 | }
|
---|
| 3015 | answer = rx_cache_get (cache, &cache->free_superstates);
|
---|
| 3016 | if (!answer)
|
---|
| 3017 | {
|
---|
| 3018 | answer = rx_cache_malloc (cache, bytes);
|
---|
| 3019 | if (answer)
|
---|
| 3020 | ++cache->superstates_allowed;
|
---|
| 3021 | }
|
---|
| 3022 | ++cache->superstates;
|
---|
| 3023 | return answer;
|
---|
| 3024 | }
|
---|
| 3025 |
|
---|
| 3026 | |
---|
| 3027 |
|
---|
| 3028 |
|
---|
| 3029 | #ifdef __STDC__
|
---|
| 3030 | static int
|
---|
| 3031 | supersetcmp (void * va, void * vb)
|
---|
| 3032 | #else
|
---|
| 3033 | static int
|
---|
| 3034 | supersetcmp (va, vb)
|
---|
| 3035 | void * va;
|
---|
| 3036 | void * vb;
|
---|
| 3037 | #endif
|
---|
| 3038 | {
|
---|
| 3039 | struct rx_superset * a = (struct rx_superset *)va;
|
---|
| 3040 | struct rx_superset * b = (struct rx_superset *)vb;
|
---|
| 3041 | return ( (a == b)
|
---|
| 3042 | || (a && b && (a->car == b->car) && (a->cdr == b->cdr)));
|
---|
| 3043 | }
|
---|
| 3044 |
|
---|
| 3045 | #ifdef __STDC__
|
---|
| 3046 | static struct rx_hash_item *
|
---|
| 3047 | superset_allocator (struct rx_hash_rules * rules, void * val)
|
---|
| 3048 | #else
|
---|
| 3049 | static struct rx_hash_item *
|
---|
| 3050 | superset_allocator (rules, val)
|
---|
| 3051 | struct rx_hash_rules * rules;
|
---|
| 3052 | void * val;
|
---|
| 3053 | #endif
|
---|
| 3054 | {
|
---|
| 3055 | struct rx_cache * cache
|
---|
| 3056 | = ((struct rx_cache *)
|
---|
| 3057 | ((char *)rules
|
---|
| 3058 | - (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules)));
|
---|
| 3059 | struct rx_superset * template = (struct rx_superset *)val;
|
---|
| 3060 | struct rx_superset * newset
|
---|
| 3061 | = ((struct rx_superset *)
|
---|
| 3062 | rx_cache_malloc_or_get (cache,
|
---|
| 3063 | &cache->free_supersets,
|
---|
| 3064 | sizeof (*template)));
|
---|
| 3065 | if (!newset)
|
---|
| 3066 | return 0;
|
---|
| 3067 | newset->refs = 0;
|
---|
| 3068 | newset->car = template->car;
|
---|
| 3069 | newset->id = template->car->id;
|
---|
| 3070 | newset->cdr = template->cdr;
|
---|
| 3071 | newset->superstate = 0;
|
---|
| 3072 | rx_protect_superset (rx, template->cdr);
|
---|
| 3073 | newset->hash_item.data = (void *)newset;
|
---|
| 3074 | newset->hash_item.binding = 0;
|
---|
| 3075 | return &newset->hash_item;
|
---|
| 3076 | }
|
---|
| 3077 |
|
---|
| 3078 | #ifdef __STDC__
|
---|
| 3079 | static struct rx_hash *
|
---|
| 3080 | super_hash_allocator (struct rx_hash_rules * rules)
|
---|
| 3081 | #else
|
---|
| 3082 | static struct rx_hash *
|
---|
| 3083 | super_hash_allocator (rules)
|
---|
| 3084 | struct rx_hash_rules * rules;
|
---|
| 3085 | #endif
|
---|
| 3086 | {
|
---|
| 3087 | struct rx_cache * cache
|
---|
| 3088 | = ((struct rx_cache *)
|
---|
| 3089 | ((char *)rules
|
---|
| 3090 | - (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules)));
|
---|
| 3091 | return ((struct rx_hash *)
|
---|
| 3092 | rx_cache_malloc_or_get (cache,
|
---|
| 3093 | &cache->free_hash, sizeof (struct rx_hash)));
|
---|
| 3094 | }
|
---|
| 3095 |
|
---|
| 3096 |
|
---|
| 3097 | #ifdef __STDC__
|
---|
| 3098 | static void
|
---|
| 3099 | super_hash_liberator (struct rx_hash * hash, struct rx_hash_rules * rules)
|
---|
| 3100 | #else
|
---|
| 3101 | static void
|
---|
| 3102 | super_hash_liberator (hash, rules)
|
---|
| 3103 | struct rx_hash * hash;
|
---|
| 3104 | struct rx_hash_rules * rules;
|
---|
| 3105 | #endif
|
---|
| 3106 | {
|
---|
| 3107 | struct rx_cache * cache
|
---|
| 3108 | = ((struct rx_cache *)
|
---|
| 3109 | (char *)rules - (long)(&((struct rx_cache *)0)->superset_hash_rules));
|
---|
| 3110 | rx_cache_free (cache, &cache->free_hash, (char *)hash);
|
---|
| 3111 | }
|
---|
| 3112 |
|
---|
| 3113 | #ifdef __STDC__
|
---|
| 3114 | static void
|
---|
| 3115 | superset_hash_item_liberator (struct rx_hash_item * it,
|
---|
| 3116 | struct rx_hash_rules * rules)
|
---|
| 3117 | #else
|
---|
| 3118 | static void
|
---|
| 3119 | superset_hash_item_liberator (it, rules) /* Well, it does ya know. */
|
---|
| 3120 | struct rx_hash_item * it;
|
---|
| 3121 | struct rx_hash_rules * rules;
|
---|
| 3122 | #endif
|
---|
| 3123 | {
|
---|
| 3124 | }
|
---|
| 3125 |
|
---|
| 3126 | int rx_cache_bound = 128;
|
---|
| 3127 | static int rx_default_cache_got = 0;
|
---|
| 3128 |
|
---|
| 3129 | #ifdef __STDC__
|
---|
| 3130 | static int
|
---|
| 3131 | bytes_for_cache_size (int supers, int cset_size)
|
---|
| 3132 | #else
|
---|
| 3133 | static int
|
---|
| 3134 | bytes_for_cache_size (supers, cset_size)
|
---|
| 3135 | int supers;
|
---|
| 3136 | int cset_size;
|
---|
| 3137 | #endif
|
---|
| 3138 | {
|
---|
| 3139 | /* What the hell is this? !!!*/
|
---|
| 3140 | return (int)
|
---|
| 3141 | ((float)supers *
|
---|
| 3142 | ( (1.03 * (float) ( rx_sizeof_bitset (cset_size)
|
---|
| 3143 | + sizeof (struct rx_super_edge)))
|
---|
| 3144 | + (1.80 * (float) sizeof (struct rx_possible_future))
|
---|
| 3145 | + (float) ( sizeof (struct rx_superstate)
|
---|
| 3146 | + cset_size * sizeof (struct rx_inx))));
|
---|
| 3147 | }
|
---|
| 3148 |
|
---|
| 3149 | #ifdef __STDC__
|
---|
| 3150 | static void
|
---|
| 3151 | rx_morecore (struct rx_cache * cache)
|
---|
| 3152 | #else
|
---|
| 3153 | static void
|
---|
| 3154 | rx_morecore (cache)
|
---|
| 3155 | struct rx_cache * cache;
|
---|
| 3156 | #endif
|
---|
| 3157 | {
|
---|
| 3158 | if (rx_default_cache_got >= rx_cache_bound)
|
---|
| 3159 | return;
|
---|
| 3160 |
|
---|
| 3161 | rx_default_cache_got += 16;
|
---|
| 3162 | cache->superstates_allowed = rx_cache_bound;
|
---|
| 3163 | {
|
---|
| 3164 | struct rx_blocklist ** pos = &cache->memory;
|
---|
| 3165 | int size = bytes_for_cache_size (16, cache->local_cset_size);
|
---|
| 3166 | while (*pos)
|
---|
| 3167 | pos = &(*pos)->next;
|
---|
| 3168 | *pos = ((struct rx_blocklist *)
|
---|
| 3169 | malloc (size + sizeof (struct rx_blocklist)));
|
---|
| 3170 | if (!*pos)
|
---|
| 3171 | return;
|
---|
| 3172 |
|
---|
| 3173 | (*pos)->next = 0;
|
---|
| 3174 | (*pos)->bytes = size;
|
---|
| 3175 | cache->memory_pos = *pos;
|
---|
| 3176 | cache->memory_addr = (char *)*pos + sizeof (**pos);
|
---|
| 3177 | cache->bytes_left = size;
|
---|
| 3178 | }
|
---|
| 3179 | }
|
---|
| 3180 |
|
---|
| 3181 | static struct rx_cache default_cache =
|
---|
| 3182 | {
|
---|
| 3183 | {
|
---|
| 3184 | supersetcmp,
|
---|
| 3185 | super_hash_allocator,
|
---|
| 3186 | super_hash_liberator,
|
---|
| 3187 | superset_allocator,
|
---|
| 3188 | superset_hash_item_liberator,
|
---|
| 3189 | },
|
---|
| 3190 | 0,
|
---|
| 3191 | 0,
|
---|
| 3192 | 0,
|
---|
| 3193 | 0,
|
---|
| 3194 | rx_morecore,
|
---|
| 3195 |
|
---|
| 3196 | 0,
|
---|
| 3197 | 0,
|
---|
| 3198 | 0,
|
---|
| 3199 | 0,
|
---|
| 3200 | 0,
|
---|
| 3201 |
|
---|
| 3202 | 0,
|
---|
| 3203 | 0,
|
---|
| 3204 |
|
---|
| 3205 | 0,
|
---|
| 3206 |
|
---|
| 3207 | 0,
|
---|
| 3208 | 0,
|
---|
| 3209 | 0,
|
---|
| 3210 | 0,
|
---|
| 3211 | 128,
|
---|
| 3212 |
|
---|
| 3213 | 256,
|
---|
| 3214 | rx_id_instruction_table,
|
---|
| 3215 |
|
---|
| 3216 | {
|
---|
| 3217 | 0,
|
---|
| 3218 | 0,
|
---|
| 3219 | {0},
|
---|
| 3220 | {0},
|
---|
| 3221 | {0}
|
---|
| 3222 | }
|
---|
| 3223 | };
|
---|
| 3224 |
|
---|
| 3225 | /* This adds an element to a superstate set. These sets are lists, such
|
---|
| 3226 | * that lists with == elements are ==. The empty set is returned by
|
---|
| 3227 | * superset_cons (rx, 0, 0) and is NOT equivelent to
|
---|
| 3228 | * (struct rx_superset)0.
|
---|
| 3229 | */
|
---|
| 3230 |
|
---|
| 3231 | #ifdef __STDC__
|
---|
| 3232 | RX_DECL struct rx_superset *
|
---|
| 3233 | rx_superset_cons (struct rx * rx,
|
---|
| 3234 | struct rx_nfa_state *car, struct rx_superset *cdr)
|
---|
| 3235 | #else
|
---|
| 3236 | RX_DECL struct rx_superset *
|
---|
| 3237 | rx_superset_cons (rx, car, cdr)
|
---|
| 3238 | struct rx * rx;
|
---|
| 3239 | struct rx_nfa_state *car;
|
---|
| 3240 | struct rx_superset *cdr;
|
---|
| 3241 | #endif
|
---|
| 3242 | {
|
---|
| 3243 | struct rx_cache * cache = rx->cache;
|
---|
| 3244 | if (!car && !cdr)
|
---|
| 3245 | {
|
---|
| 3246 | if (!cache->empty_superset)
|
---|
| 3247 | {
|
---|
| 3248 | cache->empty_superset
|
---|
| 3249 | = ((struct rx_superset *)
|
---|
| 3250 | rx_cache_malloc_or_get (cache, &cache->free_supersets,
|
---|
| 3251 | sizeof (struct rx_superset)));
|
---|
| 3252 | if (!cache->empty_superset)
|
---|
| 3253 | return 0;
|
---|
| 3254 | bzero (cache->empty_superset, sizeof (struct rx_superset));
|
---|
| 3255 | cache->empty_superset->refs = 1000;
|
---|
| 3256 | }
|
---|
| 3257 | return cache->empty_superset;
|
---|
| 3258 | }
|
---|
| 3259 | {
|
---|
| 3260 | struct rx_superset template;
|
---|
| 3261 | struct rx_hash_item * hit;
|
---|
| 3262 | template.car = car;
|
---|
| 3263 | template.cdr = cdr;
|
---|
| 3264 | template.id = car->id;
|
---|
| 3265 | hit = rx_hash_store (&cache->superset_table,
|
---|
| 3266 | (unsigned long)car ^ car->id ^ (unsigned long)cdr,
|
---|
| 3267 | (void *)&template,
|
---|
| 3268 | &cache->superset_hash_rules);
|
---|
| 3269 | return (hit
|
---|
| 3270 | ? (struct rx_superset *)hit->data
|
---|
| 3271 | : 0);
|
---|
| 3272 | }
|
---|
| 3273 | }
|
---|
| 3274 |
|
---|
| 3275 | /* This computes a union of two NFA state sets. The sets do not have the
|
---|
| 3276 | * same representation though. One is a RX_SUPERSET structure (part
|
---|
| 3277 | * of the superstate NFA) and the other is an NFA_STATE_SET (part of the NFA).
|
---|
| 3278 | */
|
---|
| 3279 |
|
---|
| 3280 | #ifdef __STDC__
|
---|
| 3281 | RX_DECL struct rx_superset *
|
---|
| 3282 | rx_superstate_eclosure_union
|
---|
| 3283 | (struct rx * rx, struct rx_superset *set, struct rx_nfa_state_set *ecl)
|
---|
| 3284 | #else
|
---|
| 3285 | RX_DECL struct rx_superset *
|
---|
| 3286 | rx_superstate_eclosure_union (rx, set, ecl)
|
---|
| 3287 | struct rx * rx;
|
---|
| 3288 | struct rx_superset *set;
|
---|
| 3289 | struct rx_nfa_state_set *ecl;
|
---|
| 3290 | #endif
|
---|
| 3291 | {
|
---|
| 3292 | if (!ecl)
|
---|
| 3293 | return set;
|
---|
| 3294 |
|
---|
| 3295 | if (!set->car)
|
---|
| 3296 | return rx_superset_cons (rx, ecl->car,
|
---|
| 3297 | rx_superstate_eclosure_union (rx, set, ecl->cdr));
|
---|
| 3298 | if (set->car == ecl->car)
|
---|
| 3299 | return rx_superstate_eclosure_union (rx, set, ecl->cdr);
|
---|
| 3300 |
|
---|
| 3301 | {
|
---|
| 3302 | struct rx_superset * tail;
|
---|
| 3303 | struct rx_nfa_state * first;
|
---|
| 3304 |
|
---|
| 3305 | if (set->car > ecl->car)
|
---|
| 3306 | {
|
---|
| 3307 | tail = rx_superstate_eclosure_union (rx, set->cdr, ecl);
|
---|
| 3308 | first = set->car;
|
---|
| 3309 | }
|
---|
| 3310 | else
|
---|
| 3311 | {
|
---|
| 3312 | tail = rx_superstate_eclosure_union (rx, set, ecl->cdr);
|
---|
| 3313 | first = ecl->car;
|
---|
| 3314 | }
|
---|
| 3315 | if (!tail)
|
---|
| 3316 | return 0;
|
---|
| 3317 | else
|
---|
| 3318 | {
|
---|
| 3319 | struct rx_superset * answer;
|
---|
| 3320 | answer = rx_superset_cons (rx, first, tail);
|
---|
| 3321 | if (!answer)
|
---|
| 3322 | {
|
---|
| 3323 | rx_protect_superset (rx, tail);
|
---|
| 3324 | rx_release_superset (rx, tail);
|
---|
| 3325 | return 0;
|
---|
| 3326 | }
|
---|
| 3327 | else
|
---|
| 3328 | return answer;
|
---|
| 3329 | }
|
---|
| 3330 | }
|
---|
| 3331 | }
|
---|
| 3332 |
|
---|
| 3333 |
|
---|
| 3334 | |
---|
| 3335 |
|
---|
| 3336 |
|
---|
| 3337 | /*
|
---|
| 3338 | * This makes sure that a list of rx_distinct_futures contains
|
---|
| 3339 | * a future for each possible set of side effects in the eclosure
|
---|
| 3340 | * of a given state. This is some of the work of filling in a
|
---|
| 3341 | * superstate transition.
|
---|
| 3342 | */
|
---|
| 3343 |
|
---|
| 3344 | #ifdef __STDC__
|
---|
| 3345 | static struct rx_distinct_future *
|
---|
| 3346 | include_futures (struct rx *rx,
|
---|
| 3347 | struct rx_distinct_future *df, struct rx_nfa_state
|
---|
| 3348 | *state, struct rx_superstate *superstate)
|
---|
| 3349 | #else
|
---|
| 3350 | static struct rx_distinct_future *
|
---|
| 3351 | include_futures (rx, df, state, superstate)
|
---|
| 3352 | struct rx *rx;
|
---|
| 3353 | struct rx_distinct_future *df;
|
---|
| 3354 | struct rx_nfa_state *state;
|
---|
| 3355 | struct rx_superstate *superstate;
|
---|
| 3356 | #endif
|
---|
| 3357 | {
|
---|
| 3358 | struct rx_possible_future *future;
|
---|
| 3359 | struct rx_cache * cache = rx->cache;
|
---|
| 3360 | for (future = state->futures; future; future = future->next)
|
---|
| 3361 | {
|
---|
| 3362 | struct rx_distinct_future *dfp;
|
---|
| 3363 | struct rx_distinct_future *insert_before = 0;
|
---|
| 3364 | if (df)
|
---|
| 3365 | df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
|
---|
| 3366 | for (dfp = df; dfp; dfp = dfp->next_same_super_edge[0])
|
---|
| 3367 | if (dfp->effects == future->effects)
|
---|
| 3368 | break;
|
---|
| 3369 | else
|
---|
| 3370 | {
|
---|
| 3371 | int order = rx->se_list_cmp (rx, dfp->effects, future->effects);
|
---|
| 3372 | if (order > 0)
|
---|
| 3373 | {
|
---|
| 3374 | insert_before = dfp;
|
---|
| 3375 | dfp = 0;
|
---|
| 3376 | break;
|
---|
| 3377 | }
|
---|
| 3378 | }
|
---|
| 3379 | if (df)
|
---|
| 3380 | df->next_same_super_edge[1]->next_same_super_edge[0] = df;
|
---|
| 3381 | if (!dfp)
|
---|
| 3382 | {
|
---|
| 3383 | dfp
|
---|
| 3384 | = ((struct rx_distinct_future *)
|
---|
| 3385 | rx_cache_malloc_or_get (cache, &cache->free_discernable_futures,
|
---|
| 3386 | sizeof (struct rx_distinct_future)));
|
---|
| 3387 | if (!dfp)
|
---|
| 3388 | return 0;
|
---|
| 3389 | if (!df)
|
---|
| 3390 | {
|
---|
| 3391 | df = insert_before = dfp;
|
---|
| 3392 | df->next_same_super_edge[0] = df->next_same_super_edge[1] = df;
|
---|
| 3393 | }
|
---|
| 3394 | else if (!insert_before)
|
---|
| 3395 | insert_before = df;
|
---|
| 3396 | else if (insert_before == df)
|
---|
| 3397 | df = dfp;
|
---|
| 3398 |
|
---|
| 3399 | dfp->next_same_super_edge[0] = insert_before;
|
---|
| 3400 | dfp->next_same_super_edge[1]
|
---|
| 3401 | = insert_before->next_same_super_edge[1];
|
---|
| 3402 | dfp->next_same_super_edge[1]->next_same_super_edge[0] = dfp;
|
---|
| 3403 | dfp->next_same_super_edge[0]->next_same_super_edge[1] = dfp;
|
---|
| 3404 | dfp->next_same_dest = dfp->prev_same_dest = dfp;
|
---|
| 3405 | dfp->future = 0;
|
---|
| 3406 | dfp->present = superstate;
|
---|
| 3407 | dfp->future_frame.inx = rx->instruction_table[rx_cache_miss];
|
---|
| 3408 | dfp->future_frame.data = 0;
|
---|
| 3409 | dfp->future_frame.data_2 = (void *) dfp;
|
---|
| 3410 | dfp->side_effects_frame.inx
|
---|
| 3411 | = rx->instruction_table[rx_do_side_effects];
|
---|
| 3412 | dfp->side_effects_frame.data = 0;
|
---|
| 3413 | dfp->side_effects_frame.data_2 = (void *) dfp;
|
---|
| 3414 | dfp->effects = future->effects;
|
---|
| 3415 | }
|
---|
| 3416 | }
|
---|
| 3417 | return df;
|
---|
| 3418 | }
|
---|
| 3419 | |
---|
| 3420 |
|
---|
| 3421 |
|
---|
| 3422 |
|
---|
| 3423 | /* This constructs a new superstate from its state set. The only
|
---|
| 3424 | * complexity here is memory management.
|
---|
| 3425 | */
|
---|
| 3426 | #ifdef __STDC__
|
---|
| 3427 | RX_DECL struct rx_superstate *
|
---|
| 3428 | rx_superstate (struct rx *rx,
|
---|
| 3429 | struct rx_superset *set)
|
---|
| 3430 | #else
|
---|
| 3431 | RX_DECL struct rx_superstate *
|
---|
| 3432 | rx_superstate (rx, set)
|
---|
| 3433 | struct rx *rx;
|
---|
| 3434 | struct rx_superset *set;
|
---|
| 3435 | #endif
|
---|
| 3436 | {
|
---|
| 3437 | struct rx_cache * cache = rx->cache;
|
---|
| 3438 | struct rx_superstate * superstate = 0;
|
---|
| 3439 |
|
---|
| 3440 | /* Does the superstate already exist in the cache? */
|
---|
| 3441 | if (set->superstate)
|
---|
| 3442 | {
|
---|
| 3443 | if (set->superstate->rx_id != rx->rx_id)
|
---|
| 3444 | {
|
---|
| 3445 | /* Aha. It is in the cache, but belongs to a superstate
|
---|
| 3446 | * that refers to an NFA that no longer exists.
|
---|
| 3447 | * (We know it no longer exists because it was evidently
|
---|
| 3448 | * stored in the same region of memory as the current nfa
|
---|
| 3449 | * yet it has a different id.)
|
---|
| 3450 | */
|
---|
| 3451 | superstate = set->superstate;
|
---|
| 3452 | if (!superstate->is_semifree)
|
---|
| 3453 | {
|
---|
| 3454 | if (cache->lru_superstate == superstate)
|
---|
| 3455 | {
|
---|
| 3456 | cache->lru_superstate = superstate->next_recyclable;
|
---|
| 3457 | if (cache->lru_superstate == superstate)
|
---|
| 3458 | cache->lru_superstate = 0;
|
---|
| 3459 | }
|
---|
| 3460 | {
|
---|
| 3461 | superstate->next_recyclable->prev_recyclable
|
---|
| 3462 | = superstate->prev_recyclable;
|
---|
| 3463 | superstate->prev_recyclable->next_recyclable
|
---|
| 3464 | = superstate->next_recyclable;
|
---|
| 3465 | if (!cache->semifree_superstate)
|
---|
| 3466 | {
|
---|
| 3467 | (cache->semifree_superstate
|
---|
| 3468 | = superstate->next_recyclable
|
---|
| 3469 | = superstate->prev_recyclable
|
---|
| 3470 | = superstate);
|
---|
| 3471 | }
|
---|
| 3472 | else
|
---|
| 3473 | {
|
---|
| 3474 | superstate->next_recyclable = cache->semifree_superstate;
|
---|
| 3475 | superstate->prev_recyclable
|
---|
| 3476 | = cache->semifree_superstate->prev_recyclable;
|
---|
| 3477 | superstate->next_recyclable->prev_recyclable
|
---|
| 3478 | = superstate;
|
---|
| 3479 | superstate->prev_recyclable->next_recyclable
|
---|
| 3480 | = superstate;
|
---|
| 3481 | cache->semifree_superstate = superstate;
|
---|
| 3482 | }
|
---|
| 3483 | ++cache->semifree_superstates;
|
---|
| 3484 | }
|
---|
| 3485 | }
|
---|
| 3486 | set->superstate = 0;
|
---|
| 3487 | goto handle_cache_miss;
|
---|
| 3488 | }
|
---|
| 3489 | ++cache->hits;
|
---|
| 3490 | superstate = set->superstate;
|
---|
| 3491 |
|
---|
| 3492 | rx_refresh_this_superstate (cache, superstate);
|
---|
| 3493 | return superstate;
|
---|
| 3494 | }
|
---|
| 3495 |
|
---|
| 3496 | handle_cache_miss:
|
---|
| 3497 |
|
---|
| 3498 | /* This point reached only for cache misses. */
|
---|
| 3499 | ++cache->misses;
|
---|
| 3500 | #if RX_DEBUG
|
---|
| 3501 | if (rx_debug_trace > 1)
|
---|
| 3502 | {
|
---|
| 3503 | struct rx_superset * setp = set;
|
---|
| 3504 | fprintf (stderr, "Building a superstet %d(%d): ", rx->rx_id, set);
|
---|
| 3505 | while (setp)
|
---|
| 3506 | {
|
---|
| 3507 | fprintf (stderr, "%d ", setp->id);
|
---|
| 3508 | setp = setp->cdr;
|
---|
| 3509 | }
|
---|
| 3510 | fprintf (stderr, "(%d)\n", set);
|
---|
| 3511 | }
|
---|
| 3512 | #endif
|
---|
| 3513 | superstate = (struct rx_superstate *)rx_cache_get_superstate (cache);
|
---|
| 3514 | if (!superstate)
|
---|
| 3515 | return 0;
|
---|
| 3516 |
|
---|
| 3517 | if (!cache->lru_superstate)
|
---|
| 3518 | (cache->lru_superstate
|
---|
| 3519 | = superstate->next_recyclable
|
---|
| 3520 | = superstate->prev_recyclable
|
---|
| 3521 | = superstate);
|
---|
| 3522 | else
|
---|
| 3523 | {
|
---|
| 3524 | superstate->next_recyclable = cache->lru_superstate;
|
---|
| 3525 | superstate->prev_recyclable = cache->lru_superstate->prev_recyclable;
|
---|
| 3526 | ( superstate->prev_recyclable->next_recyclable
|
---|
| 3527 | = superstate->next_recyclable->prev_recyclable
|
---|
| 3528 | = superstate);
|
---|
| 3529 | }
|
---|
| 3530 | superstate->rx_id = rx->rx_id;
|
---|
| 3531 | superstate->transition_refs = 0;
|
---|
| 3532 | superstate->locks = 0;
|
---|
| 3533 | superstate->is_semifree = 0;
|
---|
| 3534 | set->superstate = superstate;
|
---|
| 3535 | superstate->contents = set;
|
---|
| 3536 | rx_protect_superset (rx, set);
|
---|
| 3537 | superstate->edges = 0;
|
---|
| 3538 | {
|
---|
| 3539 | int x;
|
---|
| 3540 | /* None of the transitions from this superstate are known yet. */
|
---|
| 3541 | for (x = 0; x < rx->local_cset_size; ++x) /* &&&&& 3.8 % */
|
---|
| 3542 | {
|
---|
| 3543 | struct rx_inx * ifr = &superstate->transitions[x];
|
---|
| 3544 | ifr->inx = rx->instruction_table [rx_cache_miss];
|
---|
| 3545 | ifr->data = ifr->data_2 = 0;
|
---|
| 3546 | }
|
---|
| 3547 | }
|
---|
| 3548 | return superstate;
|
---|
| 3549 | }
|
---|
| 3550 | |
---|
| 3551 |
|
---|
| 3552 |
|
---|
| 3553 | /* This computes the destination set of one edge of the superstate NFA.
|
---|
| 3554 | * Note that a RX_DISTINCT_FUTURE is a superstate edge.
|
---|
| 3555 | * Returns 0 on an allocation failure.
|
---|
| 3556 | */
|
---|
| 3557 |
|
---|
| 3558 | #ifdef __STDC__
|
---|
| 3559 | static int
|
---|
| 3560 | solve_destination (struct rx *rx, struct rx_distinct_future *df)
|
---|
| 3561 | #else
|
---|
| 3562 | static int
|
---|
| 3563 | solve_destination (rx, df)
|
---|
| 3564 | struct rx *rx;
|
---|
| 3565 | struct rx_distinct_future *df;
|
---|
| 3566 | #endif
|
---|
| 3567 | {
|
---|
| 3568 | struct rx_super_edge *tc = df->edge;
|
---|
| 3569 | struct rx_superset *nfa_state;
|
---|
| 3570 | struct rx_superset *nil_set = rx_superset_cons (rx, 0, 0);
|
---|
| 3571 | struct rx_superset *solution = nil_set;
|
---|
| 3572 | struct rx_superstate *dest;
|
---|
| 3573 |
|
---|
| 3574 | rx_protect_superset (rx, solution);
|
---|
| 3575 | /* Iterate over all NFA states in the state set of this superstate. */
|
---|
| 3576 | for (nfa_state = df->present->contents;
|
---|
| 3577 | nfa_state->car;
|
---|
| 3578 | nfa_state = nfa_state->cdr)
|
---|
| 3579 | {
|
---|
| 3580 | struct rx_nfa_edge *e;
|
---|
| 3581 | /* Iterate over all edges of each NFA state. */
|
---|
| 3582 | for (e = nfa_state->car->edges; e; e = e->next)
|
---|
| 3583 | /* If we find an edge that is labeled with
|
---|
| 3584 | * the characters we are solving for.....
|
---|
| 3585 | */
|
---|
| 3586 | if (rx_bitset_is_subset (rx->local_cset_size,
|
---|
| 3587 | tc->cset, e->params.cset))
|
---|
| 3588 | {
|
---|
| 3589 | struct rx_nfa_state *n = e->dest;
|
---|
| 3590 | struct rx_possible_future *pf;
|
---|
| 3591 | /* ....search the partial epsilon closures of the destination
|
---|
| 3592 | * of that edge for a path that involves the same set of
|
---|
| 3593 | * side effects we are solving for.
|
---|
| 3594 | * If we find such a RX_POSSIBLE_FUTURE, we add members to the
|
---|
| 3595 | * stateset we are computing.
|
---|
| 3596 | */
|
---|
| 3597 | for (pf = n->futures; pf; pf = pf->next)
|
---|
| 3598 | if (pf->effects == df->effects)
|
---|
| 3599 | {
|
---|
| 3600 | struct rx_superset * old_sol;
|
---|
| 3601 | old_sol = solution;
|
---|
| 3602 | solution = rx_superstate_eclosure_union (rx, solution,
|
---|
| 3603 | pf->destset);
|
---|
| 3604 | if (!solution)
|
---|
| 3605 | return 0;
|
---|
| 3606 | rx_protect_superset (rx, solution);
|
---|
| 3607 | rx_release_superset (rx, old_sol);
|
---|
| 3608 | }
|
---|
| 3609 | }
|
---|
| 3610 | }
|
---|
| 3611 | /* It is possible that the RX_DISTINCT_FUTURE we are working on has
|
---|
| 3612 | * the empty set of NFA states as its definition. In that case, this
|
---|
| 3613 | * is a failure point.
|
---|
| 3614 | */
|
---|
| 3615 | if (solution == nil_set)
|
---|
| 3616 | {
|
---|
| 3617 | df->future_frame.inx = (void *) rx_backtrack;
|
---|
| 3618 | df->future_frame.data = 0;
|
---|
| 3619 | df->future_frame.data_2 = 0;
|
---|
| 3620 | return 1;
|
---|
| 3621 | }
|
---|
| 3622 | dest = rx_superstate (rx, solution);
|
---|
| 3623 | rx_release_superset (rx, solution);
|
---|
| 3624 | if (!dest)
|
---|
| 3625 | return 0;
|
---|
| 3626 |
|
---|
| 3627 | {
|
---|
| 3628 | struct rx_distinct_future *dft;
|
---|
| 3629 | dft = df;
|
---|
| 3630 | df->prev_same_dest->next_same_dest = 0;
|
---|
| 3631 | while (dft)
|
---|
| 3632 | {
|
---|
| 3633 | dft->future = dest;
|
---|
| 3634 | dft->future_frame.inx = rx->instruction_table[rx_next_char];
|
---|
| 3635 | dft->future_frame.data = (void *) dest->transitions;
|
---|
| 3636 | dft = dft->next_same_dest;
|
---|
| 3637 | }
|
---|
| 3638 | df->prev_same_dest->next_same_dest = df;
|
---|
| 3639 | }
|
---|
| 3640 | if (!dest->transition_refs)
|
---|
| 3641 | dest->transition_refs = df;
|
---|
| 3642 | else
|
---|
| 3643 | {
|
---|
| 3644 | struct rx_distinct_future *dft = dest->transition_refs->next_same_dest;
|
---|
| 3645 | dest->transition_refs->next_same_dest = df->next_same_dest;
|
---|
| 3646 | df->next_same_dest->prev_same_dest = dest->transition_refs;
|
---|
| 3647 | df->next_same_dest = dft;
|
---|
| 3648 | dft->prev_same_dest = df;
|
---|
| 3649 | }
|
---|
| 3650 | return 1;
|
---|
| 3651 | }
|
---|
| 3652 |
|
---|
| 3653 |
|
---|
| 3654 | /* This takes a superstate and a character, and computes some edges
|
---|
| 3655 | * from the superstate NFA. In particular, this computes all edges
|
---|
| 3656 | * that lead from SUPERSTATE given CHR. This function also
|
---|
| 3657 | * computes the set of characters that share this edge set.
|
---|
| 3658 | * This returns 0 on allocation error.
|
---|
| 3659 | * The character set and list of edges are returned through
|
---|
| 3660 | * the paramters CSETOUT and DFOUT.
|
---|
| 3661 | } */
|
---|
| 3662 |
|
---|
| 3663 | #ifdef __STDC__
|
---|
| 3664 | static int
|
---|
| 3665 | compute_super_edge (struct rx *rx, struct rx_distinct_future **dfout,
|
---|
| 3666 | rx_Bitset csetout, struct rx_superstate *superstate,
|
---|
| 3667 | unsigned char chr)
|
---|
| 3668 | #else
|
---|
| 3669 | static int
|
---|
| 3670 | compute_super_edge (rx, dfout, csetout, superstate, chr)
|
---|
| 3671 | struct rx *rx;
|
---|
| 3672 | struct rx_distinct_future **dfout;
|
---|
| 3673 | rx_Bitset csetout;
|
---|
| 3674 | struct rx_superstate *superstate;
|
---|
| 3675 | unsigned char chr;
|
---|
| 3676 | #endif
|
---|
| 3677 | {
|
---|
| 3678 | struct rx_superset *stateset = superstate->contents;
|
---|
| 3679 |
|
---|
| 3680 | /* To compute the set of characters that share edges with CHR,
|
---|
| 3681 | * we start with the full character set, and subtract.
|
---|
| 3682 | */
|
---|
| 3683 | rx_bitset_universe (rx->local_cset_size, csetout);
|
---|
| 3684 | *dfout = 0;
|
---|
| 3685 |
|
---|
| 3686 | /* Iterate over the NFA states in the superstate state-set. */
|
---|
| 3687 | while (stateset->car)
|
---|
| 3688 | {
|
---|
| 3689 | struct rx_nfa_edge *e;
|
---|
| 3690 | for (e = stateset->car->edges; e; e = e->next)
|
---|
| 3691 | if (RX_bitset_member (e->params.cset, chr))
|
---|
| 3692 | {
|
---|
| 3693 | /* If we find an NFA edge that applies, we make sure there
|
---|
| 3694 | * are corresponding edges in the superstate NFA.
|
---|
| 3695 | */
|
---|
| 3696 | {
|
---|
| 3697 | struct rx_distinct_future * saved;
|
---|
| 3698 | saved = *dfout;
|
---|
| 3699 | *dfout = include_futures (rx, *dfout, e->dest, superstate);
|
---|
| 3700 | if (!*dfout)
|
---|
| 3701 | {
|
---|
| 3702 | struct rx_distinct_future * df;
|
---|
| 3703 | df = saved;
|
---|
| 3704 | df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
|
---|
| 3705 | while (df)
|
---|
| 3706 | {
|
---|
| 3707 | struct rx_distinct_future *dft;
|
---|
| 3708 | dft = df;
|
---|
| 3709 | df = df->next_same_super_edge[0];
|
---|
| 3710 |
|
---|
| 3711 | if (dft->future && dft->future->transition_refs == dft)
|
---|
| 3712 | {
|
---|
| 3713 | dft->future->transition_refs = dft->next_same_dest;
|
---|
| 3714 | if (dft->future->transition_refs == dft)
|
---|
| 3715 | dft->future->transition_refs = 0;
|
---|
| 3716 | }
|
---|
| 3717 | dft->next_same_dest->prev_same_dest = dft->prev_same_dest;
|
---|
| 3718 | dft->prev_same_dest->next_same_dest = dft->next_same_dest;
|
---|
| 3719 | rx_cache_free (rx->cache,
|
---|
| 3720 | &rx->cache->free_discernable_futures,
|
---|
| 3721 | (char *)dft);
|
---|
| 3722 | }
|
---|
| 3723 | return 0;
|
---|
| 3724 | }
|
---|
| 3725 | }
|
---|
| 3726 | /* We also trim the character set a bit. */
|
---|
| 3727 | rx_bitset_intersection (rx->local_cset_size,
|
---|
| 3728 | csetout, e->params.cset);
|
---|
| 3729 | }
|
---|
| 3730 | else
|
---|
| 3731 | /* An edge that doesn't apply at least tells us some characters
|
---|
| 3732 | * that don't share the same edge set as CHR.
|
---|
| 3733 | */
|
---|
| 3734 | rx_bitset_difference (rx->local_cset_size, csetout, e->params.cset);
|
---|
| 3735 | stateset = stateset->cdr;
|
---|
| 3736 | }
|
---|
| 3737 | return 1;
|
---|
| 3738 | }
|
---|
| 3739 | |
---|
| 3740 |
|
---|
| 3741 |
|
---|
| 3742 | /* This is a constructor for RX_SUPER_EDGE structures. These are
|
---|
| 3743 | * wrappers for lists of superstate NFA edges that share character sets labels.
|
---|
| 3744 | * If a transition class contains more than one rx_distinct_future (superstate
|
---|
| 3745 | * edge), then it represents a non-determinism in the superstate NFA.
|
---|
| 3746 | */
|
---|
| 3747 |
|
---|
| 3748 | #ifdef __STDC__
|
---|
| 3749 | static struct rx_super_edge *
|
---|
| 3750 | rx_super_edge (struct rx *rx,
|
---|
| 3751 | struct rx_superstate *super, rx_Bitset cset,
|
---|
| 3752 | struct rx_distinct_future *df)
|
---|
| 3753 | #else
|
---|
| 3754 | static struct rx_super_edge *
|
---|
| 3755 | rx_super_edge (rx, super, cset, df)
|
---|
| 3756 | struct rx *rx;
|
---|
| 3757 | struct rx_superstate *super;
|
---|
| 3758 | rx_Bitset cset;
|
---|
| 3759 | struct rx_distinct_future *df;
|
---|
| 3760 | #endif
|
---|
| 3761 | {
|
---|
| 3762 | struct rx_super_edge *tc =
|
---|
| 3763 | (struct rx_super_edge *)rx_cache_malloc_or_get
|
---|
| 3764 | (rx->cache, &rx->cache->free_transition_classes,
|
---|
| 3765 | sizeof (struct rx_super_edge) + rx_sizeof_bitset (rx->local_cset_size));
|
---|
| 3766 |
|
---|
| 3767 | if (!tc)
|
---|
| 3768 | return 0;
|
---|
| 3769 | tc->next = super->edges;
|
---|
| 3770 | super->edges = tc;
|
---|
| 3771 | tc->rx_backtrack_frame.inx = rx->instruction_table[rx_backtrack_point];
|
---|
| 3772 | tc->rx_backtrack_frame.data = 0;
|
---|
| 3773 | tc->rx_backtrack_frame.data_2 = (void *) tc;
|
---|
| 3774 | tc->options = df;
|
---|
| 3775 | tc->cset = (rx_Bitset) ((char *) tc + sizeof (*tc));
|
---|
| 3776 | rx_bitset_assign (rx->local_cset_size, tc->cset, cset);
|
---|
| 3777 | if (df)
|
---|
| 3778 | {
|
---|
| 3779 | struct rx_distinct_future * dfp = df;
|
---|
| 3780 | df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
|
---|
| 3781 | while (dfp)
|
---|
| 3782 | {
|
---|
| 3783 | dfp->edge = tc;
|
---|
| 3784 | dfp = dfp->next_same_super_edge[0];
|
---|
| 3785 | }
|
---|
| 3786 | df->next_same_super_edge[1]->next_same_super_edge[0] = df;
|
---|
| 3787 | }
|
---|
| 3788 | return tc;
|
---|
| 3789 | }
|
---|
| 3790 |
|
---|
| 3791 |
|
---|
| 3792 | /* There are three kinds of cache miss. The first occurs when a
|
---|
| 3793 | * transition is taken that has never been computed during the
|
---|
| 3794 | * lifetime of the source superstate. That cache miss is handled by
|
---|
| 3795 | * calling COMPUTE_SUPER_EDGE. The second kind of cache miss
|
---|
| 3796 | * occurs when the destination superstate of a transition doesn't
|
---|
| 3797 | * exist. SOLVE_DESTINATION is used to construct the destination superstate.
|
---|
| 3798 | * Finally, the third kind of cache miss occurs when the destination
|
---|
| 3799 | * superstate of a transition is in a `semi-free state'. That case is
|
---|
| 3800 | * handled by UNFREE_SUPERSTATE.
|
---|
| 3801 | *
|
---|
| 3802 | * The function of HANDLE_CACHE_MISS is to figure out which of these
|
---|
| 3803 | * cases applies.
|
---|
| 3804 | */
|
---|
| 3805 |
|
---|
| 3806 | #ifdef __STDC__
|
---|
| 3807 | static void
|
---|
| 3808 | install_partial_transition (struct rx_superstate *super,
|
---|
| 3809 | struct rx_inx *answer,
|
---|
| 3810 | RX_subset set, int offset)
|
---|
| 3811 | #else
|
---|
| 3812 | static void
|
---|
| 3813 | install_partial_transition (super, answer, set, offset)
|
---|
| 3814 | struct rx_superstate *super;
|
---|
| 3815 | struct rx_inx *answer;
|
---|
| 3816 | RX_subset set;
|
---|
| 3817 | int offset;
|
---|
| 3818 | #endif
|
---|
| 3819 | {
|
---|
| 3820 | int start = offset;
|
---|
| 3821 | int end = start + 32;
|
---|
| 3822 | RX_subset pos = 1;
|
---|
| 3823 | struct rx_inx * transitions = super->transitions;
|
---|
| 3824 |
|
---|
| 3825 | while (start < end)
|
---|
| 3826 | {
|
---|
| 3827 | if (set & pos)
|
---|
| 3828 | transitions[start] = *answer;
|
---|
| 3829 | pos <<= 1;
|
---|
| 3830 | ++start;
|
---|
| 3831 | }
|
---|
| 3832 | }
|
---|
| 3833 |
|
---|
| 3834 |
|
---|
| 3835 | #ifdef __STDC__
|
---|
| 3836 | RX_DECL struct rx_inx *
|
---|
| 3837 | rx_handle_cache_miss
|
---|
| 3838 | (struct rx *rx, struct rx_superstate *super, unsigned char chr, void *data)
|
---|
| 3839 | #else
|
---|
| 3840 | RX_DECL struct rx_inx *
|
---|
| 3841 | rx_handle_cache_miss (rx, super, chr, data)
|
---|
| 3842 | struct rx *rx;
|
---|
| 3843 | struct rx_superstate *super;
|
---|
| 3844 | unsigned char chr;
|
---|
| 3845 | void *data;
|
---|
| 3846 | #endif
|
---|
| 3847 | {
|
---|
| 3848 | int offset = chr / RX_subset_bits;
|
---|
| 3849 | struct rx_distinct_future *df = data;
|
---|
| 3850 |
|
---|
| 3851 | if (!df) /* must be the shared_cache_miss_frame */
|
---|
| 3852 | {
|
---|
| 3853 | /* Perhaps this is just a transition waiting to be filled. */
|
---|
| 3854 | struct rx_super_edge *tc;
|
---|
| 3855 | RX_subset mask = rx_subset_singletons [chr % RX_subset_bits];
|
---|
| 3856 |
|
---|
| 3857 | for (tc = super->edges; tc; tc = tc->next)
|
---|
| 3858 | if (tc->cset[offset] & mask)
|
---|
| 3859 | {
|
---|
| 3860 | struct rx_inx * answer;
|
---|
| 3861 | df = tc->options;
|
---|
| 3862 | answer = ((tc->options->next_same_super_edge[0] != tc->options)
|
---|
| 3863 | ? &tc->rx_backtrack_frame
|
---|
| 3864 | : (df->effects
|
---|
| 3865 | ? &df->side_effects_frame
|
---|
| 3866 | : &df->future_frame));
|
---|
| 3867 | install_partial_transition (super, answer,
|
---|
| 3868 | tc->cset [offset], offset * 32);
|
---|
| 3869 | return answer;
|
---|
| 3870 | }
|
---|
| 3871 | /* Otherwise, it's a flushed or newly encountered edge. */
|
---|
| 3872 | {
|
---|
| 3873 | char cset_space[1024]; /* this limit is far from unreasonable */
|
---|
| 3874 | rx_Bitset trcset;
|
---|
| 3875 | struct rx_inx *answer;
|
---|
| 3876 |
|
---|
| 3877 | if (rx_sizeof_bitset (rx->local_cset_size) > sizeof (cset_space))
|
---|
| 3878 | return 0; /* If the arbitrary limit is hit, always fail */
|
---|
| 3879 | /* cleanly. */
|
---|
| 3880 | trcset = (rx_Bitset)cset_space;
|
---|
| 3881 | rx_lock_superstate (rx, super);
|
---|
| 3882 | if (!compute_super_edge (rx, &df, trcset, super, chr))
|
---|
| 3883 | {
|
---|
| 3884 | rx_unlock_superstate (rx, super);
|
---|
| 3885 | return 0;
|
---|
| 3886 | }
|
---|
| 3887 | if (!df) /* We just computed the fail transition. */
|
---|
| 3888 | {
|
---|
| 3889 | static struct rx_inx
|
---|
| 3890 | shared_fail_frame = { 0, 0, (void *)rx_backtrack, 0 };
|
---|
| 3891 | answer = &shared_fail_frame;
|
---|
| 3892 | }
|
---|
| 3893 | else
|
---|
| 3894 | {
|
---|
| 3895 | tc = rx_super_edge (rx, super, trcset, df);
|
---|
| 3896 | if (!tc)
|
---|
| 3897 | {
|
---|
| 3898 | rx_unlock_superstate (rx, super);
|
---|
| 3899 | return 0;
|
---|
| 3900 | }
|
---|
| 3901 | answer = ((tc->options->next_same_super_edge[0] != tc->options)
|
---|
| 3902 | ? &tc->rx_backtrack_frame
|
---|
| 3903 | : (df->effects
|
---|
| 3904 | ? &df->side_effects_frame
|
---|
| 3905 | : &df->future_frame));
|
---|
| 3906 | }
|
---|
| 3907 | install_partial_transition (super, answer,
|
---|
| 3908 | trcset[offset], offset * 32);
|
---|
| 3909 | rx_unlock_superstate (rx, super);
|
---|
| 3910 | return answer;
|
---|
| 3911 | }
|
---|
| 3912 | }
|
---|
| 3913 | else if (df->future) /* A cache miss on an edge with a future? Must be
|
---|
| 3914 | * a semi-free destination. */
|
---|
| 3915 | {
|
---|
| 3916 | if (df->future->is_semifree)
|
---|
| 3917 | refresh_semifree_superstate (rx->cache, df->future);
|
---|
| 3918 | return &df->future_frame;
|
---|
| 3919 | }
|
---|
| 3920 | else
|
---|
| 3921 | /* no future superstate on an existing edge */
|
---|
| 3922 | {
|
---|
| 3923 | rx_lock_superstate (rx, super);
|
---|
| 3924 | if (!solve_destination (rx, df))
|
---|
| 3925 | {
|
---|
| 3926 | rx_unlock_superstate (rx, super);
|
---|
| 3927 | return 0;
|
---|
| 3928 | }
|
---|
| 3929 | if (!df->effects
|
---|
| 3930 | && (df->edge->options->next_same_super_edge[0] == df->edge->options))
|
---|
| 3931 | install_partial_transition (super, &df->future_frame,
|
---|
| 3932 | df->edge->cset[offset], offset * 32);
|
---|
| 3933 | rx_unlock_superstate (rx, super);
|
---|
| 3934 | return &df->future_frame;
|
---|
| 3935 | }
|
---|
| 3936 | }
|
---|
| 3937 |
|
---|
| 3938 |
|
---|
| 3939 | |
---|
| 3940 |
|
---|
| 3941 |
|
---|
| 3942 | /* The rest of the code provides a regex.c compatable interface. */
|
---|
| 3943 |
|
---|
| 3944 |
|
---|
| 3945 | __const__ char *re_error_msg[] =
|
---|
| 3946 | {
|
---|
| 3947 | 0, /* REG_NOUT */
|
---|
| 3948 | "No match", /* REG_NOMATCH */
|
---|
| 3949 | "Invalid regular expression", /* REG_BADPAT */
|
---|
| 3950 | "Invalid collation character", /* REG_ECOLLATE */
|
---|
| 3951 | "Invalid character class name", /* REG_ECTYPE */
|
---|
| 3952 | "Trailing backslash", /* REG_EESCAPE */
|
---|
| 3953 | "Invalid back reference", /* REG_ESUBREG */
|
---|
| 3954 | "Unmatched [ or [^", /* REG_EBRACK */
|
---|
| 3955 | "Unmatched ( or \\(", /* REG_EPAREN */
|
---|
| 3956 | "Unmatched \\{", /* REG_EBRACE */
|
---|
| 3957 | "Invalid content of \\{\\}", /* REG_BADBR */
|
---|
| 3958 | "Invalid range end", /* REG_ERANGE */
|
---|
| 3959 | "Memory exhausted", /* REG_ESPACE */
|
---|
| 3960 | "Invalid preceding regular expression", /* REG_BADRPT */
|
---|
| 3961 | "Premature end of regular expression", /* REG_EEND */
|
---|
| 3962 | "Regular expression too big", /* REG_ESIZE */
|
---|
| 3963 | "Unmatched ) or \\)", /* REG_ERPAREN */
|
---|
| 3964 | };
|
---|
| 3965 |
|
---|
| 3966 |
|
---|
| 3967 | |
---|
| 3968 |
|
---|
| 3969 | /*
|
---|
| 3970 | * Macros used while compiling patterns.
|
---|
| 3971 | *
|
---|
| 3972 | * By convention, PEND points just past the end of the uncompiled pattern,
|
---|
| 3973 | * P points to the read position in the pattern. `translate' is the name
|
---|
| 3974 | * of the translation table (`TRANSLATE' is the name of a macro that looks
|
---|
| 3975 | * things up in `translate').
|
---|
| 3976 | */
|
---|
| 3977 |
|
---|
| 3978 |
|
---|
| 3979 | /*
|
---|
| 3980 | * Fetch the next character in the uncompiled pattern---translating it
|
---|
| 3981 | * if necessary. *Also cast from a signed character in the constant
|
---|
| 3982 | * string passed to us by the user to an unsigned char that we can use
|
---|
| 3983 | * as an array index (in, e.g., `translate').
|
---|
| 3984 | */
|
---|
| 3985 | #define PATFETCH(c) \
|
---|
| 3986 | do {if (p == pend) return REG_EEND; \
|
---|
| 3987 | c = (unsigned char) *p++; \
|
---|
| 3988 | c = translate[c]; \
|
---|
| 3989 | } while (0)
|
---|
| 3990 |
|
---|
| 3991 | /*
|
---|
| 3992 | * Fetch the next character in the uncompiled pattern, with no
|
---|
| 3993 | * translation.
|
---|
| 3994 | */
|
---|
| 3995 | #define PATFETCH_RAW(c) \
|
---|
| 3996 | do {if (p == pend) return REG_EEND; \
|
---|
| 3997 | c = (unsigned char) *p++; \
|
---|
| 3998 | } while (0)
|
---|
| 3999 |
|
---|
| 4000 | /* Go backwards one character in the pattern. */
|
---|
| 4001 | #define PATUNFETCH p--
|
---|
| 4002 |
|
---|
| 4003 |
|
---|
| 4004 | #define TRANSLATE(d) translate[(unsigned char) (d)]
|
---|
| 4005 |
|
---|
| 4006 | typedef unsigned regnum_t;
|
---|
| 4007 |
|
---|
| 4008 | /* Since offsets can go either forwards or backwards, this type needs to
|
---|
| 4009 | * be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1.
|
---|
| 4010 | */
|
---|
| 4011 | typedef int pattern_offset_t;
|
---|
| 4012 |
|
---|
| 4013 | typedef struct
|
---|
| 4014 | {
|
---|
| 4015 | struct rexp_node ** top_expression; /* was begalt */
|
---|
| 4016 | struct rexp_node ** last_expression; /* was laststart */
|
---|
| 4017 | pattern_offset_t inner_group_offset;
|
---|
| 4018 | regnum_t regnum;
|
---|
| 4019 | } compile_stack_elt_t;
|
---|
| 4020 |
|
---|
| 4021 | typedef struct
|
---|
| 4022 | {
|
---|
| 4023 | compile_stack_elt_t *stack;
|
---|
| 4024 | unsigned size;
|
---|
| 4025 | unsigned avail; /* Offset of next open position. */
|
---|
| 4026 | } compile_stack_type;
|
---|
| 4027 |
|
---|
| 4028 |
|
---|
| 4029 | #define INIT_COMPILE_STACK_SIZE 32
|
---|
| 4030 |
|
---|
| 4031 | #define COMPILE_STACK_EMPTY (compile_stack.avail == 0)
|
---|
| 4032 | #define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size)
|
---|
| 4033 |
|
---|
| 4034 | /* The next available element. */
|
---|
| 4035 | #define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail])
|
---|
| 4036 |
|
---|
| 4037 |
|
---|
| 4038 | /* Set the bit for character C in a list. */
|
---|
| 4039 | #define SET_LIST_BIT(c) \
|
---|
| 4040 | (b[((unsigned char) (c)) / CHARBITS] \
|
---|
| 4041 | |= 1 << (((unsigned char) c) % CHARBITS))
|
---|
| 4042 |
|
---|
| 4043 | /* Get the next unsigned number in the uncompiled pattern. */
|
---|
| 4044 | #define GET_UNSIGNED_NUMBER(num) \
|
---|
| 4045 | { if (p != pend) \
|
---|
| 4046 | { \
|
---|
| 4047 | PATFETCH (c); \
|
---|
| 4048 | while (isdigit (c)) \
|
---|
| 4049 | { \
|
---|
| 4050 | if (num < 0) \
|
---|
| 4051 | num = 0; \
|
---|
| 4052 | num = num * 10 + c - '0'; \
|
---|
| 4053 | if (p == pend) \
|
---|
| 4054 | break; \
|
---|
| 4055 | PATFETCH (c); \
|
---|
| 4056 | } \
|
---|
| 4057 | } \
|
---|
| 4058 | }
|
---|
| 4059 |
|
---|
| 4060 | #define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */
|
---|
| 4061 |
|
---|
| 4062 | #define IS_CHAR_CLASS(string) \
|
---|
| 4063 | (!strcmp (string, "alpha") || !strcmp (string, "upper") \
|
---|
| 4064 | || !strcmp (string, "lower") || !strcmp (string, "digit") \
|
---|
| 4065 | || !strcmp (string, "alnum") || !strcmp (string, "xdigit") \
|
---|
| 4066 | || !strcmp (string, "space") || !strcmp (string, "print") \
|
---|
| 4067 | || !strcmp (string, "punct") || !strcmp (string, "graph") \
|
---|
| 4068 | || !strcmp (string, "cntrl") || !strcmp (string, "blank"))
|
---|
| 4069 |
|
---|
| 4070 | |
---|
| 4071 |
|
---|
| 4072 | /* These predicates are used in regex_compile. */
|
---|
| 4073 |
|
---|
| 4074 | /* P points to just after a ^ in PATTERN. Return true if that ^ comes
|
---|
| 4075 | * after an alternative or a begin-subexpression. We assume there is at
|
---|
| 4076 | * least one character before the ^.
|
---|
| 4077 | */
|
---|
| 4078 |
|
---|
| 4079 | #ifdef __STDC__
|
---|
| 4080 | static boolean
|
---|
| 4081 | at_begline_loc_p (__const__ char *pattern, __const__ char * p, reg_syntax_t syntax)
|
---|
| 4082 | #else
|
---|
| 4083 | static boolean
|
---|
| 4084 | at_begline_loc_p (pattern, p, syntax)
|
---|
| 4085 | __const__ char *pattern;
|
---|
| 4086 | __const__ char * p;
|
---|
| 4087 | reg_syntax_t syntax;
|
---|
| 4088 | #endif
|
---|
| 4089 | {
|
---|
| 4090 | __const__ char *prev = p - 2;
|
---|
| 4091 | boolean prev_prev_backslash = ((prev > pattern) && (prev[-1] == '\\'));
|
---|
| 4092 |
|
---|
| 4093 | return
|
---|
| 4094 |
|
---|
| 4095 | (/* After a subexpression? */
|
---|
| 4096 | ((*prev == '(') && ((syntax & RE_NO_BK_PARENS) || prev_prev_backslash))
|
---|
| 4097 | ||
|
---|
| 4098 | /* After an alternative? */
|
---|
| 4099 | ((*prev == '|') && ((syntax & RE_NO_BK_VBAR) || prev_prev_backslash))
|
---|
| 4100 | );
|
---|
| 4101 | }
|
---|
| 4102 |
|
---|
| 4103 | /* The dual of at_begline_loc_p. This one is for $. We assume there is
|
---|
| 4104 | * at least one character after the $, i.e., `P < PEND'.
|
---|
| 4105 | */
|
---|
| 4106 |
|
---|
| 4107 | #ifdef __STDC__
|
---|
| 4108 | static boolean
|
---|
| 4109 | at_endline_loc_p (__const__ char *p, __const__ char *pend, int syntax)
|
---|
| 4110 | #else
|
---|
| 4111 | static boolean
|
---|
| 4112 | at_endline_loc_p (p, pend, syntax)
|
---|
| 4113 | __const__ char *p;
|
---|
| 4114 | __const__ char *pend;
|
---|
| 4115 | int syntax;
|
---|
| 4116 | #endif
|
---|
| 4117 | {
|
---|
| 4118 | __const__ char *next = p;
|
---|
| 4119 | boolean next_backslash = (*next == '\\');
|
---|
| 4120 | __const__ char *next_next = (p + 1 < pend) ? (p + 1) : 0;
|
---|
| 4121 |
|
---|
| 4122 | return
|
---|
| 4123 | (
|
---|
| 4124 | /* Before a subexpression? */
|
---|
| 4125 | ((syntax & RE_NO_BK_PARENS)
|
---|
| 4126 | ? (*next == ')')
|
---|
| 4127 | : (next_backslash && next_next && (*next_next == ')')))
|
---|
| 4128 | ||
|
---|
| 4129 | /* Before an alternative? */
|
---|
| 4130 | ((syntax & RE_NO_BK_VBAR)
|
---|
| 4131 | ? (*next == '|')
|
---|
| 4132 | : (next_backslash && next_next && (*next_next == '|')))
|
---|
| 4133 | );
|
---|
| 4134 | }
|
---|
| 4135 | |
---|
| 4136 |
|
---|
| 4137 |
|
---|
| 4138 | unsigned char rx_id_translation[256] =
|
---|
| 4139 | {
|
---|
| 4140 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
|
---|
| 4141 | 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
|
---|
| 4142 | 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
|
---|
| 4143 | 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
|
---|
| 4144 | 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
|
---|
| 4145 | 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
|
---|
| 4146 | 60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
|
---|
| 4147 | 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
|
---|
| 4148 | 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
|
---|
| 4149 | 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
|
---|
| 4150 |
|
---|
| 4151 | 100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
|
---|
| 4152 | 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
|
---|
| 4153 | 120, 121, 122, 123, 124, 125, 126, 127, 128, 129,
|
---|
| 4154 | 130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
|
---|
| 4155 | 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
|
---|
| 4156 | 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
|
---|
| 4157 | 160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
|
---|
| 4158 | 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
|
---|
| 4159 | 180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
|
---|
| 4160 | 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
|
---|
| 4161 |
|
---|
| 4162 | 200, 201, 202, 203, 204, 205, 206, 207, 208, 209,
|
---|
| 4163 | 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
|
---|
| 4164 | 220, 221, 222, 223, 224, 225, 226, 227, 228, 229,
|
---|
| 4165 | 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
|
---|
| 4166 | 240, 241, 242, 243, 244, 245, 246, 247, 248, 249,
|
---|
| 4167 | 250, 251, 252, 253, 254, 255
|
---|
| 4168 | };
|
---|
| 4169 |
|
---|
| 4170 | /* The compiler keeps an inverted translation table.
|
---|
| 4171 | * This looks up/inititalize elements.
|
---|
| 4172 | * VALID is an array of booleans that validate CACHE.
|
---|
| 4173 | */
|
---|
| 4174 |
|
---|
| 4175 | #ifdef __STDC__
|
---|
| 4176 | static rx_Bitset
|
---|
| 4177 | inverse_translation (struct re_pattern_buffer * rxb,
|
---|
| 4178 | char * valid, rx_Bitset cache,
|
---|
| 4179 | unsigned char * translate, int c)
|
---|
| 4180 | #else
|
---|
| 4181 | static rx_Bitset
|
---|
| 4182 | inverse_translation (rxb, valid, cache, translate, c)
|
---|
| 4183 | struct re_pattern_buffer * rxb;
|
---|
| 4184 | char * valid;
|
---|
| 4185 | rx_Bitset cache;
|
---|
| 4186 | unsigned char * translate;
|
---|
| 4187 | int c;
|
---|
| 4188 | #endif
|
---|
| 4189 | {
|
---|
| 4190 | rx_Bitset cs
|
---|
| 4191 | = cache + c * rx_bitset_numb_subsets (rxb->rx.local_cset_size);
|
---|
| 4192 |
|
---|
| 4193 | if (!valid[c])
|
---|
| 4194 | {
|
---|
| 4195 | int x;
|
---|
| 4196 | int c_tr = TRANSLATE(c);
|
---|
| 4197 | rx_bitset_null (rxb->rx.local_cset_size, cs);
|
---|
| 4198 | for (x = 0; x < 256; ++x) /* &&&& 13.37 */
|
---|
| 4199 | if (TRANSLATE(x) == c_tr)
|
---|
| 4200 | RX_bitset_enjoin (cs, x);
|
---|
| 4201 | valid[c] = 1;
|
---|
| 4202 | }
|
---|
| 4203 | return cs;
|
---|
| 4204 | }
|
---|
| 4205 |
|
---|
| 4206 | |
---|
| 4207 |
|
---|
| 4208 |
|
---|
| 4209 |
|
---|
| 4210 | /* More subroutine declarations and macros for regex_compile. */
|
---|
| 4211 |
|
---|
| 4212 | /* Returns true if REGNUM is in one of COMPILE_STACK's elements and
|
---|
| 4213 | false if it's not. */
|
---|
| 4214 |
|
---|
| 4215 | #ifdef __STDC__
|
---|
| 4216 | static boolean
|
---|
| 4217 | group_in_compile_stack (compile_stack_type compile_stack, regnum_t regnum)
|
---|
| 4218 | #else
|
---|
| 4219 | static boolean
|
---|
| 4220 | group_in_compile_stack (compile_stack, regnum)
|
---|
| 4221 | compile_stack_type compile_stack;
|
---|
| 4222 | regnum_t regnum;
|
---|
| 4223 | #endif
|
---|
| 4224 | {
|
---|
| 4225 | int this_element;
|
---|
| 4226 |
|
---|
| 4227 | for (this_element = compile_stack.avail - 1;
|
---|
| 4228 | this_element >= 0;
|
---|
| 4229 | this_element--)
|
---|
| 4230 | if (compile_stack.stack[this_element].regnum == regnum)
|
---|
| 4231 | return true;
|
---|
| 4232 |
|
---|
| 4233 | return false;
|
---|
| 4234 | }
|
---|
| 4235 |
|
---|
| 4236 |
|
---|
| 4237 | /*
|
---|
| 4238 | * Read the ending character of a range (in a bracket expression) from the
|
---|
| 4239 | * uncompiled pattern *P_PTR (which ends at PEND). We assume the
|
---|
| 4240 | * starting character is in `P[-2]'. (`P[-1]' is the character `-'.)
|
---|
| 4241 | * Then we set the translation of all bits between the starting and
|
---|
| 4242 | * ending characters (inclusive) in the compiled pattern B.
|
---|
| 4243 | *
|
---|
| 4244 | * Return an error code.
|
---|
| 4245 | *
|
---|
| 4246 | * We use these short variable names so we can use the same macros as
|
---|
| 4247 | * `regex_compile' itself.
|
---|
| 4248 | */
|
---|
| 4249 |
|
---|
| 4250 | #ifdef __STDC__
|
---|
| 4251 | static reg_errcode_t
|
---|
| 4252 | compile_range (struct re_pattern_buffer * rxb, rx_Bitset cs,
|
---|
| 4253 | __const__ char ** p_ptr, __const__ char * pend,
|
---|
| 4254 | unsigned char * translate, reg_syntax_t syntax,
|
---|
| 4255 | rx_Bitset inv_tr, char * valid_inv_tr)
|
---|
| 4256 | #else
|
---|
| 4257 | static reg_errcode_t
|
---|
| 4258 | compile_range (rxb, cs, p_ptr, pend, translate, syntax, inv_tr, valid_inv_tr)
|
---|
| 4259 | struct re_pattern_buffer * rxb;
|
---|
| 4260 | rx_Bitset cs;
|
---|
| 4261 | __const__ char ** p_ptr;
|
---|
| 4262 | __const__ char * pend;
|
---|
| 4263 | unsigned char * translate;
|
---|
| 4264 | reg_syntax_t syntax;
|
---|
| 4265 | rx_Bitset inv_tr;
|
---|
| 4266 | char * valid_inv_tr;
|
---|
| 4267 | #endif
|
---|
| 4268 | {
|
---|
| 4269 | unsigned this_char;
|
---|
| 4270 |
|
---|
| 4271 | __const__ char *p = *p_ptr;
|
---|
| 4272 |
|
---|
| 4273 | unsigned char range_end;
|
---|
| 4274 | unsigned char range_start = TRANSLATE(p[-2]);
|
---|
| 4275 |
|
---|
| 4276 | if (p == pend)
|
---|
| 4277 | return REG_ERANGE;
|
---|
| 4278 |
|
---|
| 4279 | PATFETCH (range_end);
|
---|
| 4280 |
|
---|
| 4281 | (*p_ptr)++;
|
---|
| 4282 |
|
---|
| 4283 | if (range_start > range_end)
|
---|
| 4284 | return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR;
|
---|
| 4285 |
|
---|
| 4286 | for (this_char = range_start; this_char <= range_end; this_char++)
|
---|
| 4287 | {
|
---|
| 4288 | rx_Bitset it =
|
---|
| 4289 | inverse_translation (rxb, valid_inv_tr, inv_tr, translate, this_char);
|
---|
| 4290 | rx_bitset_union (rxb->rx.local_cset_size, cs, it);
|
---|
| 4291 | }
|
---|
| 4292 |
|
---|
| 4293 | return REG_NOERROR;
|
---|
| 4294 | }
|
---|
| 4295 | |
---|
| 4296 |
|
---|
| 4297 |
|
---|
| 4298 | /* This searches a regexp for backreference side effects.
|
---|
| 4299 | * It fills in the array OUT with 1 at the index of every register pair
|
---|
| 4300 | * referenced by a backreference.
|
---|
| 4301 | *
|
---|
| 4302 | * This is used to help optimize patterns for searching. The information is
|
---|
| 4303 | * useful because, if the caller doesn't want register values, backreferenced
|
---|
| 4304 | * registers are the only registers for which we need rx_backtrack.
|
---|
| 4305 | */
|
---|
| 4306 |
|
---|
| 4307 | #ifdef __STDC__
|
---|
| 4308 | static void
|
---|
| 4309 | find_backrefs (char * out, struct rexp_node * rexp,
|
---|
| 4310 | struct re_se_params * params)
|
---|
| 4311 | #else
|
---|
| 4312 | static void
|
---|
| 4313 | find_backrefs (out, rexp, params)
|
---|
| 4314 | char * out;
|
---|
| 4315 | struct rexp_node * rexp;
|
---|
| 4316 | struct re_se_params * params;
|
---|
| 4317 | #endif
|
---|
| 4318 | {
|
---|
| 4319 | if (rexp)
|
---|
| 4320 | switch (rexp->type)
|
---|
| 4321 | {
|
---|
| 4322 | case r_cset:
|
---|
| 4323 | case r_data:
|
---|
| 4324 | return;
|
---|
| 4325 | case r_alternate:
|
---|
| 4326 | case r_concat:
|
---|
| 4327 | case r_opt:
|
---|
| 4328 | case r_star:
|
---|
| 4329 | case r_2phase_star:
|
---|
| 4330 | find_backrefs (out, rexp->params.pair.left, params);
|
---|
| 4331 | find_backrefs (out, rexp->params.pair.right, params);
|
---|
| 4332 | return;
|
---|
| 4333 | case r_side_effect:
|
---|
| 4334 | if ( ((long)rexp->params.side_effect >= 0)
|
---|
| 4335 | && (params [(long)rexp->params.side_effect].se == re_se_backref))
|
---|
| 4336 | out[ params [(long)rexp->params.side_effect].op1] = 1;
|
---|
| 4337 | return;
|
---|
| 4338 | }
|
---|
| 4339 | }
|
---|
| 4340 |
|
---|
| 4341 | |
---|
| 4342 |
|
---|
| 4343 |
|
---|
| 4344 | /* Returns 0 unless the pattern can match the empty string. */
|
---|
| 4345 |
|
---|
| 4346 | #ifdef __STDC__
|
---|
| 4347 | static int
|
---|
| 4348 | compute_fastset (struct re_pattern_buffer * rxb, struct rexp_node * rexp)
|
---|
| 4349 | #else
|
---|
| 4350 | static int
|
---|
| 4351 | compute_fastset (rxb, rexp)
|
---|
| 4352 | struct re_pattern_buffer * rxb;
|
---|
| 4353 | struct rexp_node * rexp;
|
---|
| 4354 | #endif
|
---|
| 4355 | {
|
---|
| 4356 | if (!rexp)
|
---|
| 4357 | return 1;
|
---|
| 4358 | switch (rexp->type)
|
---|
| 4359 | {
|
---|
| 4360 | case r_data:
|
---|
| 4361 | return 1;
|
---|
| 4362 | case r_cset:
|
---|
| 4363 | {
|
---|
| 4364 | rx_bitset_union (rxb->rx.local_cset_size,
|
---|
| 4365 | rxb->fastset, rexp->params.cset);
|
---|
| 4366 | }
|
---|
| 4367 | return 0;
|
---|
| 4368 | case r_concat:
|
---|
| 4369 | return (compute_fastset (rxb, rexp->params.pair.left)
|
---|
| 4370 | && compute_fastset (rxb, rexp->params.pair.right));
|
---|
| 4371 | case r_2phase_star:
|
---|
| 4372 | compute_fastset (rxb, rexp->params.pair.left);
|
---|
| 4373 | /* compute_fastset (rxb, rexp->params.pair.right); nope... */
|
---|
| 4374 | return 1;
|
---|
| 4375 | case r_alternate:
|
---|
| 4376 | return !!(compute_fastset (rxb, rexp->params.pair.left)
|
---|
| 4377 | + compute_fastset (rxb, rexp->params.pair.right));
|
---|
| 4378 | case r_opt:
|
---|
| 4379 | case r_star:
|
---|
| 4380 | compute_fastset (rxb, rexp->params.pair.left);
|
---|
| 4381 | return 1;
|
---|
| 4382 | case r_side_effect:
|
---|
| 4383 | return 1;
|
---|
| 4384 | }
|
---|
| 4385 |
|
---|
| 4386 | /* this should never happen */
|
---|
| 4387 | return 0;
|
---|
| 4388 | }
|
---|
| 4389 | |
---|
| 4390 |
|
---|
| 4391 |
|
---|
| 4392 | /* returns
|
---|
| 4393 | * 1 -- yes, definately anchored by the given side effect.
|
---|
| 4394 | * 2 -- maybe anchored, maybe the empty string.
|
---|
| 4395 | * 0 -- definately not anchored
|
---|
| 4396 | * There is simply no other possibility.
|
---|
| 4397 | */
|
---|
| 4398 |
|
---|
| 4399 | #ifdef __STDC__
|
---|
| 4400 | static int
|
---|
| 4401 | is_anchored (struct rexp_node * rexp, rx_side_effect se)
|
---|
| 4402 | #else
|
---|
| 4403 | static int
|
---|
| 4404 | is_anchored (rexp, se)
|
---|
| 4405 | struct rexp_node * rexp;
|
---|
| 4406 | rx_side_effect se;
|
---|
| 4407 | #endif
|
---|
| 4408 | {
|
---|
| 4409 | if (!rexp)
|
---|
| 4410 | return 2;
|
---|
| 4411 | switch (rexp->type)
|
---|
| 4412 | {
|
---|
| 4413 | case r_cset:
|
---|
| 4414 | case r_data:
|
---|
| 4415 | return 0;
|
---|
| 4416 | case r_concat:
|
---|
| 4417 | case r_2phase_star:
|
---|
| 4418 | {
|
---|
| 4419 | int l = is_anchored (rexp->params.pair.left, se);
|
---|
| 4420 | return (l == 2 ? is_anchored (rexp->params.pair.right, se) : l);
|
---|
| 4421 | }
|
---|
| 4422 | case r_alternate:
|
---|
| 4423 | {
|
---|
| 4424 | int l = is_anchored (rexp->params.pair.left, se);
|
---|
| 4425 | int r = l ? is_anchored (rexp->params.pair.right, se) : 0;
|
---|
| 4426 |
|
---|
| 4427 | if (l == r)
|
---|
| 4428 | return l;
|
---|
| 4429 | else if ((l == 0) || (r == 0))
|
---|
| 4430 | return 0;
|
---|
| 4431 | else
|
---|
| 4432 | return 2;
|
---|
| 4433 | }
|
---|
| 4434 | case r_opt:
|
---|
| 4435 | case r_star:
|
---|
| 4436 | return is_anchored (rexp->params.pair.left, se) ? 2 : 0;
|
---|
| 4437 |
|
---|
| 4438 | case r_side_effect:
|
---|
| 4439 | return ((rexp->params.side_effect == se)
|
---|
| 4440 | ? 1 : 2);
|
---|
| 4441 | }
|
---|
| 4442 |
|
---|
| 4443 | /* this should never happen */
|
---|
| 4444 | return 0;
|
---|
| 4445 | }
|
---|
| 4446 |
|
---|
| 4447 | |
---|
| 4448 |
|
---|
| 4449 | /* This removes register assignments that aren't required by backreferencing.
|
---|
| 4450 | * This can speed up explore_future, especially if it eliminates
|
---|
| 4451 | * non-determinism in the superstate NFA.
|
---|
| 4452 | *
|
---|
| 4453 | * NEEDED is an array of characters, presumably filled in by FIND_BACKREFS.
|
---|
| 4454 | * The non-zero elements of the array indicate which register assignments
|
---|
| 4455 | * can NOT be removed from the expression.
|
---|
| 4456 | */
|
---|
| 4457 |
|
---|
| 4458 | #ifdef __STDC__
|
---|
| 4459 | static struct rexp_node *
|
---|
| 4460 | remove_unecessary_side_effects (struct rx * rx, char * needed,
|
---|
| 4461 | struct rexp_node * rexp,
|
---|
| 4462 | struct re_se_params * params)
|
---|
| 4463 | #else
|
---|
| 4464 | static struct rexp_node *
|
---|
| 4465 | remove_unecessary_side_effects (rx, needed, rexp, params)
|
---|
| 4466 | struct rx * rx;
|
---|
| 4467 | char * needed;
|
---|
| 4468 | struct rexp_node * rexp;
|
---|
| 4469 | struct re_se_params * params;
|
---|
| 4470 | #endif
|
---|
| 4471 | {
|
---|
| 4472 | struct rexp_node * l;
|
---|
| 4473 | struct rexp_node * r;
|
---|
| 4474 | if (!rexp)
|
---|
| 4475 | return 0;
|
---|
| 4476 | else
|
---|
| 4477 | switch (rexp->type)
|
---|
| 4478 | {
|
---|
| 4479 | case r_cset:
|
---|
| 4480 | case r_data:
|
---|
| 4481 | return rexp;
|
---|
| 4482 | case r_alternate:
|
---|
| 4483 | case r_concat:
|
---|
| 4484 | case r_2phase_star:
|
---|
| 4485 | l = remove_unecessary_side_effects (rx, needed,
|
---|
| 4486 | rexp->params.pair.left, params);
|
---|
| 4487 | r = remove_unecessary_side_effects (rx, needed,
|
---|
| 4488 | rexp->params.pair.right, params);
|
---|
| 4489 | if ((l && r) || (rexp->type != r_concat))
|
---|
| 4490 | {
|
---|
| 4491 | rexp->params.pair.left = l;
|
---|
| 4492 | rexp->params.pair.right = r;
|
---|
| 4493 | return rexp;
|
---|
| 4494 | }
|
---|
| 4495 | else
|
---|
| 4496 | {
|
---|
| 4497 | rexp->params.pair.left = rexp->params.pair.right = 0;
|
---|
| 4498 | rx_free_rexp (rx, rexp);
|
---|
| 4499 | return l ? l : r;
|
---|
| 4500 | }
|
---|
| 4501 | case r_opt:
|
---|
| 4502 | case r_star:
|
---|
| 4503 | l = remove_unecessary_side_effects (rx, needed,
|
---|
| 4504 | rexp->params.pair.left, params);
|
---|
| 4505 | if (l)
|
---|
| 4506 | {
|
---|
| 4507 | rexp->params.pair.left = l;
|
---|
| 4508 | return rexp;
|
---|
| 4509 | }
|
---|
| 4510 | else
|
---|
| 4511 | {
|
---|
| 4512 | rexp->params.pair.left = 0;
|
---|
| 4513 | rx_free_rexp (rx, rexp);
|
---|
| 4514 | return 0;
|
---|
| 4515 | }
|
---|
| 4516 | case r_side_effect:
|
---|
| 4517 | {
|
---|
| 4518 | int se = (long)rexp->params.side_effect;
|
---|
| 4519 | if ( (se >= 0)
|
---|
| 4520 | && ( ((enum re_side_effects)params[se].se == re_se_lparen)
|
---|
| 4521 | || ((enum re_side_effects)params[se].se == re_se_rparen))
|
---|
| 4522 | && (params [se].op1 > 0)
|
---|
| 4523 | && (!needed [params [se].op1]))
|
---|
| 4524 | {
|
---|
| 4525 | rx_free_rexp (rx, rexp);
|
---|
| 4526 | return 0;
|
---|
| 4527 | }
|
---|
| 4528 | else
|
---|
| 4529 | return rexp;
|
---|
| 4530 | }
|
---|
| 4531 | }
|
---|
| 4532 |
|
---|
| 4533 | /* this should never happen */
|
---|
| 4534 | return 0;
|
---|
| 4535 | }
|
---|
| 4536 |
|
---|
| 4537 | |
---|
| 4538 |
|
---|
| 4539 |
|
---|
| 4540 | #ifdef __STDC__
|
---|
| 4541 | static int
|
---|
| 4542 | pointless_if_repeated (struct rexp_node * node, struct re_se_params * params)
|
---|
| 4543 | #else
|
---|
| 4544 | static int
|
---|
| 4545 | pointless_if_repeated (node, params)
|
---|
| 4546 | struct rexp_node * node;
|
---|
| 4547 | struct re_se_params * params;
|
---|
| 4548 | #endif
|
---|
| 4549 | {
|
---|
| 4550 | if (!node)
|
---|
| 4551 | return 1;
|
---|
| 4552 | switch (node->type)
|
---|
| 4553 | {
|
---|
| 4554 | case r_cset:
|
---|
| 4555 | return 0;
|
---|
| 4556 | case r_alternate:
|
---|
| 4557 | case r_concat:
|
---|
| 4558 | case r_2phase_star:
|
---|
| 4559 | return (pointless_if_repeated (node->params.pair.left, params)
|
---|
| 4560 | && pointless_if_repeated (node->params.pair.right, params));
|
---|
| 4561 | case r_opt:
|
---|
| 4562 | case r_star:
|
---|
| 4563 | return pointless_if_repeated (node->params.pair.left, params);
|
---|
| 4564 | case r_side_effect:
|
---|
| 4565 | switch ((enum re_side_effects) (((long)node->params.side_effect < 0)
|
---|
| 4566 | ? (enum re_side_effects) (long) node->params.side_effect
|
---|
| 4567 | : (enum re_side_effects)params[(long)node->params.side_effect].se))
|
---|
| 4568 | {
|
---|
| 4569 | case re_se_try:
|
---|
| 4570 | case re_se_at_dot:
|
---|
| 4571 | case re_se_begbuf:
|
---|
| 4572 | case re_se_hat:
|
---|
| 4573 | case re_se_wordbeg:
|
---|
| 4574 | case re_se_wordbound:
|
---|
| 4575 | case re_se_notwordbound:
|
---|
| 4576 | case re_se_wordend:
|
---|
| 4577 | case re_se_endbuf:
|
---|
| 4578 | case re_se_dollar:
|
---|
| 4579 | case re_se_fail:
|
---|
| 4580 | case re_se_win:
|
---|
| 4581 | return 1;
|
---|
| 4582 | case re_se_lparen:
|
---|
| 4583 | case re_se_rparen:
|
---|
| 4584 | case re_se_iter:
|
---|
| 4585 | case re_se_end_iter:
|
---|
| 4586 | case re_se_syntax:
|
---|
| 4587 | case re_se_not_syntax:
|
---|
| 4588 | case re_se_backref:
|
---|
| 4589 | return 0;
|
---|
| 4590 | }
|
---|
| 4591 | case r_data:
|
---|
| 4592 | default:
|
---|
| 4593 | return 0;
|
---|
| 4594 | }
|
---|
| 4595 | }
|
---|
| 4596 |
|
---|
| 4597 | |
---|
| 4598 |
|
---|
| 4599 |
|
---|
| 4600 | #ifdef __STDC__
|
---|
| 4601 | static int
|
---|
| 4602 | registers_on_stack (struct re_pattern_buffer * rxb,
|
---|
| 4603 | struct rexp_node * rexp, int in_danger,
|
---|
| 4604 | struct re_se_params * params)
|
---|
| 4605 | #else
|
---|
| 4606 | static int
|
---|
| 4607 | registers_on_stack (rxb, rexp, in_danger, params)
|
---|
| 4608 | struct re_pattern_buffer * rxb;
|
---|
| 4609 | struct rexp_node * rexp;
|
---|
| 4610 | int in_danger;
|
---|
| 4611 | struct re_se_params * params;
|
---|
| 4612 | #endif
|
---|
| 4613 | {
|
---|
| 4614 | if (!rexp)
|
---|
| 4615 | return 0;
|
---|
| 4616 | else
|
---|
| 4617 | switch (rexp->type)
|
---|
| 4618 | {
|
---|
| 4619 | case r_cset:
|
---|
| 4620 | case r_data:
|
---|
| 4621 | return 0;
|
---|
| 4622 | case r_alternate:
|
---|
| 4623 | case r_concat:
|
---|
| 4624 | return ( registers_on_stack (rxb, rexp->params.pair.left,
|
---|
| 4625 | in_danger, params)
|
---|
| 4626 | || (registers_on_stack
|
---|
| 4627 | (rxb, rexp->params.pair.right,
|
---|
| 4628 | in_danger, params)));
|
---|
| 4629 | case r_opt:
|
---|
| 4630 | return registers_on_stack (rxb, rexp->params.pair.left, 0, params);
|
---|
| 4631 | case r_star:
|
---|
| 4632 | return registers_on_stack (rxb, rexp->params.pair.left, 1, params);
|
---|
| 4633 | case r_2phase_star:
|
---|
| 4634 | return
|
---|
| 4635 | ( registers_on_stack (rxb, rexp->params.pair.left, 1, params)
|
---|
| 4636 | || registers_on_stack (rxb, rexp->params.pair.right, 1, params));
|
---|
| 4637 | case r_side_effect:
|
---|
| 4638 | {
|
---|
| 4639 | int se = (long)rexp->params.side_effect;
|
---|
| 4640 | if ( in_danger
|
---|
| 4641 | && (se >= 0)
|
---|
| 4642 | && (params [se].op1 > 0)
|
---|
| 4643 | && ( ((enum re_side_effects)params[se].se == re_se_lparen)
|
---|
| 4644 | || ((enum re_side_effects)params[se].se == re_se_rparen)))
|
---|
| 4645 | return 1;
|
---|
| 4646 | else
|
---|
| 4647 | return 0;
|
---|
| 4648 | }
|
---|
| 4649 | }
|
---|
| 4650 |
|
---|
| 4651 | /* this should never happen */
|
---|
| 4652 | return 0;
|
---|
| 4653 | }
|
---|
| 4654 |
|
---|
| 4655 | |
---|
| 4656 |
|
---|
| 4657 |
|
---|
| 4658 | static char idempotent_complex_se[] =
|
---|
| 4659 | {
|
---|
| 4660 | #define RX_WANT_SE_DEFS 1
|
---|
| 4661 | #undef RX_DEF_SE
|
---|
| 4662 | #undef RX_DEF_CPLX_SE
|
---|
| 4663 | #define RX_DEF_SE(IDEM, NAME, VALUE)
|
---|
| 4664 | #define RX_DEF_CPLX_SE(IDEM, NAME, VALUE) IDEM,
|
---|
| 4665 | #include "rx.h"
|
---|
| 4666 | #undef RX_DEF_SE
|
---|
| 4667 | #undef RX_DEF_CPLX_SE
|
---|
| 4668 | #undef RX_WANT_SE_DEFS
|
---|
| 4669 | 23
|
---|
| 4670 | };
|
---|
| 4671 |
|
---|
| 4672 | static char idempotent_se[] =
|
---|
| 4673 | {
|
---|
| 4674 | 13,
|
---|
| 4675 | #define RX_WANT_SE_DEFS 1
|
---|
| 4676 | #undef RX_DEF_SE
|
---|
| 4677 | #undef RX_DEF_CPLX_SE
|
---|
| 4678 | #define RX_DEF_SE(IDEM, NAME, VALUE) IDEM,
|
---|
| 4679 | #define RX_DEF_CPLX_SE(IDEM, NAME, VALUE)
|
---|
| 4680 | #include "rx.h"
|
---|
| 4681 | #undef RX_DEF_SE
|
---|
| 4682 | #undef RX_DEF_CPLX_SE
|
---|
| 4683 | #undef RX_WANT_SE_DEFS
|
---|
| 4684 | 42
|
---|
| 4685 | };
|
---|
| 4686 |
|
---|
| 4687 | |
---|
| 4688 |
|
---|
| 4689 |
|
---|
| 4690 |
|
---|
| 4691 | #ifdef __STDC__
|
---|
| 4692 | static int
|
---|
| 4693 | has_any_se (struct rx * rx,
|
---|
| 4694 | struct rexp_node * rexp)
|
---|
| 4695 | #else
|
---|
| 4696 | static int
|
---|
| 4697 | has_any_se (rx, rexp)
|
---|
| 4698 | struct rx * rx;
|
---|
| 4699 | struct rexp_node * rexp;
|
---|
| 4700 | #endif
|
---|
| 4701 | {
|
---|
| 4702 | if (!rexp)
|
---|
| 4703 | return 0;
|
---|
| 4704 |
|
---|
| 4705 | switch (rexp->type)
|
---|
| 4706 | {
|
---|
| 4707 | case r_cset:
|
---|
| 4708 | case r_data:
|
---|
| 4709 | return 0;
|
---|
| 4710 |
|
---|
| 4711 | case r_side_effect:
|
---|
| 4712 | return 1;
|
---|
| 4713 |
|
---|
| 4714 | case r_2phase_star:
|
---|
| 4715 | case r_concat:
|
---|
| 4716 | case r_alternate:
|
---|
| 4717 | return
|
---|
| 4718 | ( has_any_se (rx, rexp->params.pair.left)
|
---|
| 4719 | || has_any_se (rx, rexp->params.pair.right));
|
---|
| 4720 |
|
---|
| 4721 | case r_opt:
|
---|
| 4722 | case r_star:
|
---|
| 4723 | return has_any_se (rx, rexp->params.pair.left);
|
---|
| 4724 | }
|
---|
| 4725 |
|
---|
| 4726 | /* this should never happen */
|
---|
| 4727 | return 0;
|
---|
| 4728 | }
|
---|
| 4729 |
|
---|
| 4730 | |
---|
| 4731 |
|
---|
| 4732 |
|
---|
| 4733 | /* This must be called AFTER `convert_hard_loops' for a given REXP. */
|
---|
| 4734 | #ifdef __STDC__
|
---|
| 4735 | static int
|
---|
| 4736 | has_non_idempotent_epsilon_path (struct rx * rx,
|
---|
| 4737 | struct rexp_node * rexp,
|
---|
| 4738 | struct re_se_params * params)
|
---|
| 4739 | #else
|
---|
| 4740 | static int
|
---|
| 4741 | has_non_idempotent_epsilon_path (rx, rexp, params)
|
---|
| 4742 | struct rx * rx;
|
---|
| 4743 | struct rexp_node * rexp;
|
---|
| 4744 | struct re_se_params * params;
|
---|
| 4745 | #endif
|
---|
| 4746 | {
|
---|
| 4747 | if (!rexp)
|
---|
| 4748 | return 0;
|
---|
| 4749 |
|
---|
| 4750 | switch (rexp->type)
|
---|
| 4751 | {
|
---|
| 4752 | case r_cset:
|
---|
| 4753 | case r_data:
|
---|
| 4754 | case r_star:
|
---|
| 4755 | return 0;
|
---|
| 4756 |
|
---|
| 4757 | case r_side_effect:
|
---|
| 4758 | return
|
---|
| 4759 | !((long)rexp->params.side_effect > 0
|
---|
| 4760 | ? idempotent_complex_se [ params [(long)rexp->params.side_effect].se ]
|
---|
| 4761 | : idempotent_se [-(long)rexp->params.side_effect]);
|
---|
| 4762 |
|
---|
| 4763 | case r_alternate:
|
---|
| 4764 | return
|
---|
| 4765 | ( has_non_idempotent_epsilon_path (rx,
|
---|
| 4766 | rexp->params.pair.left, params)
|
---|
| 4767 | || has_non_idempotent_epsilon_path (rx,
|
---|
| 4768 | rexp->params.pair.right, params));
|
---|
| 4769 |
|
---|
| 4770 | case r_2phase_star:
|
---|
| 4771 | case r_concat:
|
---|
| 4772 | return
|
---|
| 4773 | ( has_non_idempotent_epsilon_path (rx,
|
---|
| 4774 | rexp->params.pair.left, params)
|
---|
| 4775 | && has_non_idempotent_epsilon_path (rx,
|
---|
| 4776 | rexp->params.pair.right, params));
|
---|
| 4777 |
|
---|
| 4778 | case r_opt:
|
---|
| 4779 | return has_non_idempotent_epsilon_path (rx,
|
---|
| 4780 | rexp->params.pair.left, params);
|
---|
| 4781 | }
|
---|
| 4782 |
|
---|
| 4783 | /* this should never happen */
|
---|
| 4784 | return 0;
|
---|
| 4785 | }
|
---|
| 4786 |
|
---|
| 4787 | |
---|
| 4788 |
|
---|
| 4789 |
|
---|
| 4790 | /* This computes rougly what it's name suggests. It can (and does) go wrong
|
---|
| 4791 | * in the direction of returning spurious 0 without causing disasters.
|
---|
| 4792 | */
|
---|
| 4793 | #ifdef __STDC__
|
---|
| 4794 | static int
|
---|
| 4795 | begins_with_complex_se (struct rx * rx, struct rexp_node * rexp)
|
---|
| 4796 | #else
|
---|
| 4797 | static int
|
---|
| 4798 | begins_with_complex_se (rx, rexp)
|
---|
| 4799 | struct rx * rx;
|
---|
| 4800 | struct rexp_node * rexp;
|
---|
| 4801 | #endif
|
---|
| 4802 | {
|
---|
| 4803 | if (!rexp)
|
---|
| 4804 | return 0;
|
---|
| 4805 |
|
---|
| 4806 | switch (rexp->type)
|
---|
| 4807 | {
|
---|
| 4808 | case r_cset:
|
---|
| 4809 | case r_data:
|
---|
| 4810 | return 0;
|
---|
| 4811 |
|
---|
| 4812 | case r_side_effect:
|
---|
| 4813 | return ((long)rexp->params.side_effect >= 0);
|
---|
| 4814 |
|
---|
| 4815 | case r_alternate:
|
---|
| 4816 | return
|
---|
| 4817 | ( begins_with_complex_se (rx, rexp->params.pair.left)
|
---|
| 4818 | && begins_with_complex_se (rx, rexp->params.pair.right));
|
---|
| 4819 |
|
---|
| 4820 |
|
---|
| 4821 | case r_concat:
|
---|
| 4822 | return has_any_se (rx, rexp->params.pair.left);
|
---|
| 4823 | case r_opt:
|
---|
| 4824 | case r_star:
|
---|
| 4825 | case r_2phase_star:
|
---|
| 4826 | return 0;
|
---|
| 4827 | }
|
---|
| 4828 |
|
---|
| 4829 | /* this should never happen */
|
---|
| 4830 | return 0;
|
---|
| 4831 | }
|
---|
| 4832 |
|
---|
| 4833 | |
---|
| 4834 |
|
---|
| 4835 | /* This destructively removes some of the re_se_tv side effects from
|
---|
| 4836 | * a rexp tree. In particular, during parsing re_se_tv was inserted on the
|
---|
| 4837 | * right half of every | to guarantee that posix path preference could be
|
---|
| 4838 | * honored. This function removes some which it can be determined aren't
|
---|
| 4839 | * needed.
|
---|
| 4840 | */
|
---|
| 4841 |
|
---|
| 4842 | #ifdef __STDC__
|
---|
| 4843 | static void
|
---|
| 4844 | speed_up_alt (struct rx * rx,
|
---|
| 4845 | struct rexp_node * rexp,
|
---|
| 4846 | int unposix)
|
---|
| 4847 | #else
|
---|
| 4848 | static void
|
---|
| 4849 | speed_up_alt (rx, rexp, unposix)
|
---|
| 4850 | struct rx * rx;
|
---|
| 4851 | struct rexp_node * rexp;
|
---|
| 4852 | int unposix;
|
---|
| 4853 | #endif
|
---|
| 4854 | {
|
---|
| 4855 | if (!rexp)
|
---|
| 4856 | return;
|
---|
| 4857 |
|
---|
| 4858 | switch (rexp->type)
|
---|
| 4859 | {
|
---|
| 4860 | case r_cset:
|
---|
| 4861 | case r_data:
|
---|
| 4862 | case r_side_effect:
|
---|
| 4863 | return;
|
---|
| 4864 |
|
---|
| 4865 | case r_opt:
|
---|
| 4866 | case r_star:
|
---|
| 4867 | speed_up_alt (rx, rexp->params.pair.left, unposix);
|
---|
| 4868 | return;
|
---|
| 4869 |
|
---|
| 4870 | case r_2phase_star:
|
---|
| 4871 | case r_concat:
|
---|
| 4872 | speed_up_alt (rx, rexp->params.pair.left, unposix);
|
---|
| 4873 | speed_up_alt (rx, rexp->params.pair.right, unposix);
|
---|
| 4874 | return;
|
---|
| 4875 |
|
---|
| 4876 | case r_alternate:
|
---|
| 4877 | /* the right child is guaranteed to be (concat re_se_tv <subexp>) */
|
---|
| 4878 |
|
---|
| 4879 | speed_up_alt (rx, rexp->params.pair.left, unposix);
|
---|
| 4880 | speed_up_alt (rx, rexp->params.pair.right->params.pair.right, unposix);
|
---|
| 4881 |
|
---|
| 4882 | if ( unposix
|
---|
| 4883 | || (begins_with_complex_se
|
---|
| 4884 | (rx, rexp->params.pair.right->params.pair.right))
|
---|
| 4885 | || !( has_any_se (rx, rexp->params.pair.right->params.pair.right)
|
---|
| 4886 | || has_any_se (rx, rexp->params.pair.left)))
|
---|
| 4887 | {
|
---|
| 4888 | struct rexp_node * conc = rexp->params.pair.right;
|
---|
| 4889 | rexp->params.pair.right = conc->params.pair.right;
|
---|
| 4890 | conc->params.pair.right = 0;
|
---|
| 4891 | rx_free_rexp (rx, conc);
|
---|
| 4892 | }
|
---|
| 4893 | }
|
---|
| 4894 | }
|
---|
| 4895 |
|
---|
| 4896 |
|
---|
| 4897 | |
---|
| 4898 |
|
---|
| 4899 |
|
---|
| 4900 |
|
---|
| 4901 | /* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX.
|
---|
| 4902 | Returns one of error codes defined in `regex.h', or zero for success.
|
---|
| 4903 |
|
---|
| 4904 | Assumes the `allocated' (and perhaps `buffer') and `translate'
|
---|
| 4905 | fields are set in BUFP on entry.
|
---|
| 4906 |
|
---|
| 4907 | If it succeeds, results are put in BUFP (if it returns an error, the
|
---|
| 4908 | contents of BUFP are undefined):
|
---|
| 4909 | `buffer' is the compiled pattern;
|
---|
| 4910 | `syntax' is set to SYNTAX;
|
---|
| 4911 | `used' is set to the length of the compiled pattern;
|
---|
| 4912 | `fastmap_accurate' is set to zero;
|
---|
| 4913 | `re_nsub' is set to the number of groups in PATTERN;
|
---|
| 4914 | `not_bol' and `not_eol' are set to zero.
|
---|
| 4915 |
|
---|
| 4916 | The `fastmap' and `newline_anchor' fields are neither
|
---|
| 4917 | examined nor set. */
|
---|
| 4918 |
|
---|
| 4919 |
|
---|
| 4920 |
|
---|
| 4921 | #ifdef __STDC__
|
---|
| 4922 | RX_DECL reg_errcode_t
|
---|
| 4923 | rx_compile (__const__ char *pattern, int size,
|
---|
| 4924 | reg_syntax_t syntax,
|
---|
| 4925 | struct re_pattern_buffer * rxb)
|
---|
| 4926 | #else
|
---|
| 4927 | RX_DECL reg_errcode_t
|
---|
| 4928 | rx_compile (pattern, size, syntax, rxb)
|
---|
| 4929 | __const__ char *pattern;
|
---|
| 4930 | int size;
|
---|
| 4931 | reg_syntax_t syntax;
|
---|
| 4932 | struct re_pattern_buffer * rxb;
|
---|
| 4933 | #endif
|
---|
| 4934 | {
|
---|
| 4935 | RX_subset
|
---|
| 4936 | inverse_translate [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)];
|
---|
| 4937 | char
|
---|
| 4938 | validate_inv_tr [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)];
|
---|
| 4939 |
|
---|
| 4940 | /* We fetch characters from PATTERN here. Even though PATTERN is
|
---|
| 4941 | `char *' (i.e., signed), we declare these variables as unsigned, so
|
---|
| 4942 | they can be reliably used as array indices. */
|
---|
| 4943 | register unsigned char c, c1;
|
---|
| 4944 |
|
---|
| 4945 | /* A random tempory spot in PATTERN. */
|
---|
| 4946 | __const__ char *p1;
|
---|
| 4947 |
|
---|
| 4948 | /* Keeps track of unclosed groups. */
|
---|
| 4949 | compile_stack_type compile_stack;
|
---|
| 4950 |
|
---|
| 4951 | /* Points to the current (ending) position in the pattern. */
|
---|
| 4952 | __const__ char *p = pattern;
|
---|
| 4953 | __const__ char *pend = pattern + size;
|
---|
| 4954 |
|
---|
| 4955 | /* How to translate the characters in the pattern. */
|
---|
| 4956 | unsigned char *translate = (rxb->translate
|
---|
| 4957 | ? rxb->translate
|
---|
| 4958 | : rx_id_translation);
|
---|
| 4959 |
|
---|
| 4960 | /* When parsing is done, this will hold the expression tree. */
|
---|
| 4961 | struct rexp_node * rexp = 0;
|
---|
| 4962 |
|
---|
| 4963 | /* In the midst of compilation, this holds onto the regexp
|
---|
| 4964 | * first parst while rexp goes on to aquire additional constructs.
|
---|
| 4965 | */
|
---|
| 4966 | struct rexp_node * orig_rexp = 0;
|
---|
| 4967 | struct rexp_node * fewer_side_effects = 0;
|
---|
| 4968 |
|
---|
| 4969 | /* This and top_expression are saved on the compile stack. */
|
---|
| 4970 | struct rexp_node ** top_expression = &rexp;
|
---|
| 4971 | struct rexp_node ** last_expression = top_expression;
|
---|
| 4972 |
|
---|
| 4973 | /* Parameter to `goto append_node' */
|
---|
| 4974 | struct rexp_node * append;
|
---|
| 4975 |
|
---|
| 4976 | /* Counts open-groups as they are encountered. This is the index of the
|
---|
| 4977 | * innermost group being compiled.
|
---|
| 4978 | */
|
---|
| 4979 | regnum_t regnum = 0;
|
---|
| 4980 |
|
---|
| 4981 | /* Place in the uncompiled pattern (i.e., the {) to
|
---|
| 4982 | * which to go back if the interval is invalid.
|
---|
| 4983 | */
|
---|
| 4984 | __const__ char *beg_interval;
|
---|
| 4985 |
|
---|
| 4986 | struct re_se_params * params = 0;
|
---|
| 4987 | int paramc = 0; /* How many complex side effects so far? */
|
---|
| 4988 |
|
---|
| 4989 | rx_side_effect side; /* param to `goto add_side_effect' */
|
---|
| 4990 |
|
---|
| 4991 | bzero (validate_inv_tr, sizeof (validate_inv_tr));
|
---|
| 4992 |
|
---|
| 4993 | rxb->rx.instruction_table = rx_id_instruction_table;
|
---|
| 4994 |
|
---|
| 4995 |
|
---|
| 4996 | /* Initialize the compile stack. */
|
---|
| 4997 | compile_stack.stack = (( compile_stack_elt_t *) malloc ((INIT_COMPILE_STACK_SIZE) * sizeof ( compile_stack_elt_t)));
|
---|
| 4998 | if (compile_stack.stack == 0)
|
---|
| 4999 | return REG_ESPACE;
|
---|
| 5000 |
|
---|
| 5001 | compile_stack.size = INIT_COMPILE_STACK_SIZE;
|
---|
| 5002 | compile_stack.avail = 0;
|
---|
| 5003 |
|
---|
| 5004 | /* Initialize the pattern buffer. */
|
---|
| 5005 | rxb->rx.cache = &default_cache;
|
---|
| 5006 | rxb->syntax = syntax;
|
---|
| 5007 | rxb->fastmap_accurate = 0;
|
---|
| 5008 | rxb->not_bol = rxb->not_eol = 0;
|
---|
| 5009 | rxb->least_subs = 0;
|
---|
| 5010 |
|
---|
| 5011 | /* Always count groups, whether or not rxb->no_sub is set.
|
---|
| 5012 | * The whole pattern is implicitly group 0, so counting begins
|
---|
| 5013 | * with 1.
|
---|
| 5014 | */
|
---|
| 5015 | rxb->re_nsub = 0;
|
---|
| 5016 |
|
---|
| 5017 | #if !defined (emacs) && !defined (SYNTAX_TABLE)
|
---|
| 5018 | /* Initialize the syntax table. */
|
---|
| 5019 | init_syntax_once ();
|
---|
| 5020 | #endif
|
---|
| 5021 |
|
---|
| 5022 | /* Loop through the uncompiled pattern until we're at the end. */
|
---|
| 5023 | while (p != pend)
|
---|
| 5024 | {
|
---|
| 5025 | PATFETCH (c);
|
---|
| 5026 |
|
---|
| 5027 | switch (c)
|
---|
| 5028 | {
|
---|
| 5029 | case '^':
|
---|
| 5030 | {
|
---|
| 5031 | if ( /* If at start of pattern, it's an operator. */
|
---|
| 5032 | p == pattern + 1
|
---|
| 5033 | /* If context independent, it's an operator. */
|
---|
| 5034 | || syntax & RE_CONTEXT_INDEP_ANCHORS
|
---|
| 5035 | /* Otherwise, depends on what's come before. */
|
---|
| 5036 | || at_begline_loc_p (pattern, p, syntax))
|
---|
| 5037 | {
|
---|
| 5038 | struct rexp_node * n
|
---|
| 5039 | = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_hat);
|
---|
| 5040 | if (!n)
|
---|
| 5041 | return REG_ESPACE;
|
---|
| 5042 | append = n;
|
---|
| 5043 | goto append_node;
|
---|
| 5044 | }
|
---|
| 5045 | else
|
---|
| 5046 | goto normal_char;
|
---|
| 5047 | }
|
---|
| 5048 | break;
|
---|
| 5049 |
|
---|
| 5050 |
|
---|
| 5051 | case '$':
|
---|
| 5052 | {
|
---|
| 5053 | if ( /* If at end of pattern, it's an operator. */
|
---|
| 5054 | p == pend
|
---|
| 5055 | /* If context independent, it's an operator. */
|
---|
| 5056 | || syntax & RE_CONTEXT_INDEP_ANCHORS
|
---|
| 5057 | /* Otherwise, depends on what's next. */
|
---|
| 5058 | || at_endline_loc_p (p, pend, syntax))
|
---|
| 5059 | {
|
---|
| 5060 | struct rexp_node * n
|
---|
| 5061 | = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_dollar);
|
---|
| 5062 | if (!n)
|
---|
| 5063 | return REG_ESPACE;
|
---|
| 5064 | append = n;
|
---|
| 5065 | goto append_node;
|
---|
| 5066 | }
|
---|
| 5067 | else
|
---|
| 5068 | goto normal_char;
|
---|
| 5069 | }
|
---|
| 5070 | break;
|
---|
| 5071 |
|
---|
| 5072 |
|
---|
| 5073 | case '+':
|
---|
| 5074 | case '?':
|
---|
| 5075 | if ((syntax & RE_BK_PLUS_QM)
|
---|
| 5076 | || (syntax & RE_LIMITED_OPS))
|
---|
| 5077 | goto normal_char;
|
---|
| 5078 |
|
---|
| 5079 | handle_plus:
|
---|
| 5080 | case '*':
|
---|
| 5081 | /* If there is no previous pattern... */
|
---|
| 5082 | if (pointless_if_repeated (*last_expression, params))
|
---|
| 5083 | {
|
---|
| 5084 | if (syntax & RE_CONTEXT_INVALID_OPS)
|
---|
| 5085 | return REG_BADRPT;
|
---|
| 5086 | else if (!(syntax & RE_CONTEXT_INDEP_OPS))
|
---|
| 5087 | goto normal_char;
|
---|
| 5088 | }
|
---|
| 5089 |
|
---|
| 5090 | {
|
---|
| 5091 | /* 1 means zero (many) matches is allowed. */
|
---|
| 5092 | char zero_times_ok = 0, many_times_ok = 0;
|
---|
| 5093 |
|
---|
| 5094 | /* If there is a sequence of repetition chars, collapse it
|
---|
| 5095 | down to just one (the right one). We can't combine
|
---|
| 5096 | interval operators with these because of, e.g., `a{2}*',
|
---|
| 5097 | which should only match an even number of `a's. */
|
---|
| 5098 |
|
---|
| 5099 | for (;;)
|
---|
| 5100 | {
|
---|
| 5101 | zero_times_ok |= c != '+';
|
---|
| 5102 | many_times_ok |= c != '?';
|
---|
| 5103 |
|
---|
| 5104 | if (p == pend)
|
---|
| 5105 | break;
|
---|
| 5106 |
|
---|
| 5107 | PATFETCH (c);
|
---|
| 5108 |
|
---|
| 5109 | if (c == '*'
|
---|
| 5110 | || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?')))
|
---|
| 5111 | ;
|
---|
| 5112 |
|
---|
| 5113 | else if (syntax & RE_BK_PLUS_QM && c == '\\')
|
---|
| 5114 | {
|
---|
| 5115 | if (p == pend) return REG_EESCAPE;
|
---|
| 5116 |
|
---|
| 5117 | PATFETCH (c1);
|
---|
| 5118 | if (!(c1 == '+' || c1 == '?'))
|
---|
| 5119 | {
|
---|
| 5120 | PATUNFETCH;
|
---|
| 5121 | PATUNFETCH;
|
---|
| 5122 | break;
|
---|
| 5123 | }
|
---|
| 5124 |
|
---|
| 5125 | c = c1;
|
---|
| 5126 | }
|
---|
| 5127 | else
|
---|
| 5128 | {
|
---|
| 5129 | PATUNFETCH;
|
---|
| 5130 | break;
|
---|
| 5131 | }
|
---|
| 5132 |
|
---|
| 5133 | /* If we get here, we found another repeat character. */
|
---|
| 5134 | }
|
---|
| 5135 |
|
---|
| 5136 | /* Star, etc. applied to an empty pattern is equivalent
|
---|
| 5137 | to an empty pattern. */
|
---|
| 5138 | if (!last_expression)
|
---|
| 5139 | break;
|
---|
| 5140 |
|
---|
| 5141 | /* Now we know whether or not zero matches is allowed
|
---|
| 5142 | * and also whether or not two or more matches is allowed.
|
---|
| 5143 | */
|
---|
| 5144 |
|
---|
| 5145 | {
|
---|
| 5146 | struct rexp_node * inner_exp = *last_expression;
|
---|
| 5147 | int need_sync = 0;
|
---|
| 5148 |
|
---|
| 5149 | if (many_times_ok
|
---|
| 5150 | && has_non_idempotent_epsilon_path (&rxb->rx,
|
---|
| 5151 | inner_exp, params))
|
---|
| 5152 | {
|
---|
| 5153 | struct rexp_node * pusher
|
---|
| 5154 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5155 | (rx_side_effect)re_se_pushpos);
|
---|
| 5156 | struct rexp_node * checker
|
---|
| 5157 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5158 | (rx_side_effect)re_se_chkpos);
|
---|
| 5159 | struct rexp_node * pushback
|
---|
| 5160 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5161 | (rx_side_effect)re_se_pushback);
|
---|
| 5162 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5163 | struct rexp_node * lit_t = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5164 | struct rexp_node * fake_state
|
---|
| 5165 | = rx_mk_r_concat (&rxb->rx, pushback, lit_t);
|
---|
| 5166 | struct rexp_node * phase2
|
---|
| 5167 | = rx_mk_r_concat (&rxb->rx, checker, fake_state);
|
---|
| 5168 | struct rexp_node * popper
|
---|
| 5169 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5170 | (rx_side_effect)re_se_poppos);
|
---|
| 5171 | struct rexp_node * star
|
---|
| 5172 | = rx_mk_r_2phase_star (&rxb->rx, inner_exp, phase2);
|
---|
| 5173 | struct rexp_node * a
|
---|
| 5174 | = rx_mk_r_concat (&rxb->rx, pusher, star);
|
---|
| 5175 | struct rexp_node * whole_thing
|
---|
| 5176 | = rx_mk_r_concat (&rxb->rx, a, popper);
|
---|
| 5177 | if (!(pusher && star && pushback && lit_t && fake_state
|
---|
| 5178 | && lit_t && phase2 && checker && popper
|
---|
| 5179 | && a && whole_thing))
|
---|
| 5180 | return REG_ESPACE;
|
---|
| 5181 | RX_bitset_enjoin (cs, 't');
|
---|
| 5182 | *last_expression = whole_thing;
|
---|
| 5183 | }
|
---|
| 5184 | else
|
---|
| 5185 | {
|
---|
| 5186 | struct rexp_node * star =
|
---|
| 5187 | (many_times_ok ? rx_mk_r_star : rx_mk_r_opt)
|
---|
| 5188 | (&rxb->rx, *last_expression);
|
---|
| 5189 | if (!star)
|
---|
| 5190 | return REG_ESPACE;
|
---|
| 5191 | *last_expression = star;
|
---|
| 5192 | need_sync = has_any_se (&rxb->rx, *last_expression);
|
---|
| 5193 | }
|
---|
| 5194 | if (!zero_times_ok)
|
---|
| 5195 | {
|
---|
| 5196 | struct rexp_node * concat
|
---|
| 5197 | = rx_mk_r_concat (&rxb->rx, inner_exp,
|
---|
| 5198 | rx_copy_rexp (&rxb->rx,
|
---|
| 5199 | *last_expression));
|
---|
| 5200 | if (!concat)
|
---|
| 5201 | return REG_ESPACE;
|
---|
| 5202 | *last_expression = concat;
|
---|
| 5203 | }
|
---|
| 5204 | if (need_sync)
|
---|
| 5205 | {
|
---|
| 5206 | int sync_se = paramc;
|
---|
| 5207 | params = (params
|
---|
| 5208 | ? ((struct re_se_params *)
|
---|
| 5209 | realloc (params,
|
---|
| 5210 | sizeof (*params) * (1 + paramc)))
|
---|
| 5211 | : ((struct re_se_params *)
|
---|
| 5212 | malloc (sizeof (*params))));
|
---|
| 5213 | if (!params)
|
---|
| 5214 | return REG_ESPACE;
|
---|
| 5215 | ++paramc;
|
---|
| 5216 | params [sync_se].se = re_se_tv;
|
---|
| 5217 | side = (rx_side_effect)sync_se;
|
---|
| 5218 | goto add_side_effect;
|
---|
| 5219 | }
|
---|
| 5220 | }
|
---|
| 5221 | /* The old regex.c used to optimize `.*\n'.
|
---|
| 5222 | * Maybe rx should too?
|
---|
| 5223 | */
|
---|
| 5224 | }
|
---|
| 5225 | break;
|
---|
| 5226 |
|
---|
| 5227 |
|
---|
| 5228 | case '.':
|
---|
| 5229 | {
|
---|
| 5230 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5231 | struct rexp_node * n = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5232 | if (!(cs && n))
|
---|
| 5233 | return REG_ESPACE;
|
---|
| 5234 |
|
---|
| 5235 | rx_bitset_universe (rxb->rx.local_cset_size, cs);
|
---|
| 5236 | if (!(rxb->syntax & RE_DOT_NEWLINE))
|
---|
| 5237 | RX_bitset_remove (cs, '\n');
|
---|
| 5238 | if (!(rxb->syntax & RE_DOT_NOT_NULL))
|
---|
| 5239 | RX_bitset_remove (cs, 0);
|
---|
| 5240 |
|
---|
| 5241 | append = n;
|
---|
| 5242 | goto append_node;
|
---|
| 5243 | break;
|
---|
| 5244 | }
|
---|
| 5245 |
|
---|
| 5246 |
|
---|
| 5247 | case '[':
|
---|
| 5248 | if (p == pend) return REG_EBRACK;
|
---|
| 5249 | {
|
---|
| 5250 | boolean had_char_class = false;
|
---|
| 5251 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5252 | struct rexp_node * node = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5253 | int is_inverted = *p == '^';
|
---|
| 5254 |
|
---|
| 5255 | if (!(node && cs))
|
---|
| 5256 | return REG_ESPACE;
|
---|
| 5257 |
|
---|
| 5258 | /* This branch of the switch is normally exited with
|
---|
| 5259 | *`goto append_node'
|
---|
| 5260 | */
|
---|
| 5261 | append = node;
|
---|
| 5262 |
|
---|
| 5263 | if (is_inverted)
|
---|
| 5264 | p++;
|
---|
| 5265 |
|
---|
| 5266 | /* Remember the first position in the bracket expression. */
|
---|
| 5267 | p1 = p;
|
---|
| 5268 |
|
---|
| 5269 | /* Read in characters and ranges, setting map bits. */
|
---|
| 5270 | for (;;)
|
---|
| 5271 | {
|
---|
| 5272 | if (p == pend) return REG_EBRACK;
|
---|
| 5273 |
|
---|
| 5274 | PATFETCH (c);
|
---|
| 5275 |
|
---|
| 5276 | /* \ might escape characters inside [...] and [^...]. */
|
---|
| 5277 | if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')
|
---|
| 5278 | {
|
---|
| 5279 | if (p == pend) return REG_EESCAPE;
|
---|
| 5280 |
|
---|
| 5281 | PATFETCH (c1);
|
---|
| 5282 | {
|
---|
| 5283 | rx_Bitset it = inverse_translation (rxb,
|
---|
| 5284 | validate_inv_tr,
|
---|
| 5285 | inverse_translate,
|
---|
| 5286 | translate,
|
---|
| 5287 | c1);
|
---|
| 5288 | rx_bitset_union (rxb->rx.local_cset_size, cs, it);
|
---|
| 5289 | }
|
---|
| 5290 | continue;
|
---|
| 5291 | }
|
---|
| 5292 |
|
---|
| 5293 | /* Could be the end of the bracket expression. If it's
|
---|
| 5294 | not (i.e., when the bracket expression is `[]' so
|
---|
| 5295 | far), the ']' character bit gets set way below. */
|
---|
| 5296 | if (c == ']' && p != p1 + 1)
|
---|
| 5297 | goto finalize_class_and_append;
|
---|
| 5298 |
|
---|
| 5299 | /* Look ahead to see if it's a range when the last thing
|
---|
| 5300 | was a character class. */
|
---|
| 5301 | if (had_char_class && c == '-' && *p != ']')
|
---|
| 5302 | return REG_ERANGE;
|
---|
| 5303 |
|
---|
| 5304 | /* Look ahead to see if it's a range when the last thing
|
---|
| 5305 | was a character: if this is a hyphen not at the
|
---|
| 5306 | beginning or the end of a list, then it's the range
|
---|
| 5307 | operator. */
|
---|
| 5308 | if (c == '-'
|
---|
| 5309 | && !(p - 2 >= pattern && p[-2] == '[')
|
---|
| 5310 | && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')
|
---|
| 5311 | && *p != ']')
|
---|
| 5312 | {
|
---|
| 5313 | reg_errcode_t ret
|
---|
| 5314 | = compile_range (rxb, cs, &p, pend, translate, syntax,
|
---|
| 5315 | inverse_translate, validate_inv_tr);
|
---|
| 5316 | if (ret != REG_NOERROR) return ret;
|
---|
| 5317 | }
|
---|
| 5318 |
|
---|
| 5319 | else if (p[0] == '-' && p[1] != ']')
|
---|
| 5320 | { /* This handles ranges made up of characters only. */
|
---|
| 5321 | reg_errcode_t ret;
|
---|
| 5322 |
|
---|
| 5323 | /* Move past the `-'. */
|
---|
| 5324 | PATFETCH (c1);
|
---|
| 5325 |
|
---|
| 5326 | ret = compile_range (rxb, cs, &p, pend, translate, syntax,
|
---|
| 5327 | inverse_translate, validate_inv_tr);
|
---|
| 5328 | if (ret != REG_NOERROR) return ret;
|
---|
| 5329 | }
|
---|
| 5330 |
|
---|
| 5331 | /* See if we're at the beginning of a possible character
|
---|
| 5332 | class. */
|
---|
| 5333 |
|
---|
| 5334 | else if ((syntax & RE_CHAR_CLASSES)
|
---|
| 5335 | && (c == '[') && (*p == ':'))
|
---|
| 5336 | {
|
---|
| 5337 | char str[CHAR_CLASS_MAX_LENGTH + 1];
|
---|
| 5338 |
|
---|
| 5339 | PATFETCH (c);
|
---|
| 5340 | c1 = 0;
|
---|
| 5341 |
|
---|
| 5342 | /* If pattern is `[[:'. */
|
---|
| 5343 | if (p == pend) return REG_EBRACK;
|
---|
| 5344 |
|
---|
| 5345 | for (;;)
|
---|
| 5346 | {
|
---|
| 5347 | PATFETCH (c);
|
---|
| 5348 | if (c == ':' || c == ']' || p == pend
|
---|
| 5349 | || c1 == CHAR_CLASS_MAX_LENGTH)
|
---|
| 5350 | break;
|
---|
| 5351 | str[c1++] = c;
|
---|
| 5352 | }
|
---|
| 5353 | str[c1] = '\0';
|
---|
| 5354 |
|
---|
| 5355 | /* If isn't a word bracketed by `[:' and:`]':
|
---|
| 5356 | undo the ending character, the letters, and leave
|
---|
| 5357 | the leading `:' and `[' (but set bits for them). */
|
---|
| 5358 | if (c == ':' && *p == ']')
|
---|
| 5359 | {
|
---|
| 5360 | int ch;
|
---|
| 5361 | boolean is_alnum = !strcmp (str, "alnum");
|
---|
| 5362 | boolean is_alpha = !strcmp (str, "alpha");
|
---|
| 5363 | boolean is_blank = !strcmp (str, "blank");
|
---|
| 5364 | boolean is_cntrl = !strcmp (str, "cntrl");
|
---|
| 5365 | boolean is_digit = !strcmp (str, "digit");
|
---|
| 5366 | boolean is_graph = !strcmp (str, "graph");
|
---|
| 5367 | boolean is_lower = !strcmp (str, "lower");
|
---|
| 5368 | boolean is_print = !strcmp (str, "print");
|
---|
| 5369 | boolean is_punct = !strcmp (str, "punct");
|
---|
| 5370 | boolean is_space = !strcmp (str, "space");
|
---|
| 5371 | boolean is_upper = !strcmp (str, "upper");
|
---|
| 5372 | boolean is_xdigit = !strcmp (str, "xdigit");
|
---|
| 5373 |
|
---|
| 5374 | if (!IS_CHAR_CLASS (str)) return REG_ECTYPE;
|
---|
| 5375 |
|
---|
| 5376 | /* Throw away the ] at the end of the character
|
---|
| 5377 | class. */
|
---|
| 5378 | PATFETCH (c);
|
---|
| 5379 |
|
---|
| 5380 | if (p == pend) return REG_EBRACK;
|
---|
| 5381 |
|
---|
| 5382 | for (ch = 0; ch < 1 << CHARBITS; ch++)
|
---|
| 5383 | {
|
---|
| 5384 | if ( (is_alnum && isalnum (ch))
|
---|
| 5385 | || (is_alpha && isalpha (ch))
|
---|
| 5386 | || (is_blank && isblank (ch))
|
---|
| 5387 | || (is_cntrl && iscntrl (ch))
|
---|
| 5388 | || (is_digit && isdigit (ch))
|
---|
| 5389 | || (is_graph && isgraph (ch))
|
---|
| 5390 | || (is_lower && islower (ch))
|
---|
| 5391 | || (is_print && isprint (ch))
|
---|
| 5392 | || (is_punct && ispunct (ch))
|
---|
| 5393 | || (is_space && isspace (ch))
|
---|
| 5394 | || (is_upper && isupper (ch))
|
---|
| 5395 | || (is_xdigit && isxdigit (ch)))
|
---|
| 5396 | {
|
---|
| 5397 | rx_Bitset it =
|
---|
| 5398 | inverse_translation (rxb,
|
---|
| 5399 | validate_inv_tr,
|
---|
| 5400 | inverse_translate,
|
---|
| 5401 | translate,
|
---|
| 5402 | ch);
|
---|
| 5403 | rx_bitset_union (rxb->rx.local_cset_size,
|
---|
| 5404 | cs, it);
|
---|
| 5405 | }
|
---|
| 5406 | }
|
---|
| 5407 | had_char_class = true;
|
---|
| 5408 | }
|
---|
| 5409 | else
|
---|
| 5410 | {
|
---|
| 5411 | c1++;
|
---|
| 5412 | while (c1--)
|
---|
| 5413 | PATUNFETCH;
|
---|
| 5414 | {
|
---|
| 5415 | rx_Bitset it =
|
---|
| 5416 | inverse_translation (rxb,
|
---|
| 5417 | validate_inv_tr,
|
---|
| 5418 | inverse_translate,
|
---|
| 5419 | translate,
|
---|
| 5420 | '[');
|
---|
| 5421 | rx_bitset_union (rxb->rx.local_cset_size,
|
---|
| 5422 | cs, it);
|
---|
| 5423 | }
|
---|
| 5424 | {
|
---|
| 5425 | rx_Bitset it =
|
---|
| 5426 | inverse_translation (rxb,
|
---|
| 5427 | validate_inv_tr,
|
---|
| 5428 | inverse_translate,
|
---|
| 5429 | translate,
|
---|
| 5430 | ':');
|
---|
| 5431 | rx_bitset_union (rxb->rx.local_cset_size,
|
---|
| 5432 | cs, it);
|
---|
| 5433 | }
|
---|
| 5434 | had_char_class = false;
|
---|
| 5435 | }
|
---|
| 5436 | }
|
---|
| 5437 | else
|
---|
| 5438 | {
|
---|
| 5439 | had_char_class = false;
|
---|
| 5440 | {
|
---|
| 5441 | rx_Bitset it = inverse_translation (rxb,
|
---|
| 5442 | validate_inv_tr,
|
---|
| 5443 | inverse_translate,
|
---|
| 5444 | translate,
|
---|
| 5445 | c);
|
---|
| 5446 | rx_bitset_union (rxb->rx.local_cset_size, cs, it);
|
---|
| 5447 | }
|
---|
| 5448 | }
|
---|
| 5449 | }
|
---|
| 5450 |
|
---|
| 5451 | finalize_class_and_append:
|
---|
| 5452 | if (is_inverted)
|
---|
| 5453 | {
|
---|
| 5454 | rx_bitset_complement (rxb->rx.local_cset_size, cs);
|
---|
| 5455 | if (syntax & RE_HAT_LISTS_NOT_NEWLINE)
|
---|
| 5456 | RX_bitset_remove (cs, '\n');
|
---|
| 5457 | }
|
---|
| 5458 | goto append_node;
|
---|
| 5459 | }
|
---|
| 5460 | break;
|
---|
| 5461 |
|
---|
| 5462 |
|
---|
| 5463 | case '(':
|
---|
| 5464 | if (syntax & RE_NO_BK_PARENS)
|
---|
| 5465 | goto handle_open;
|
---|
| 5466 | else
|
---|
| 5467 | goto normal_char;
|
---|
| 5468 |
|
---|
| 5469 |
|
---|
| 5470 | case ')':
|
---|
| 5471 | if (syntax & RE_NO_BK_PARENS)
|
---|
| 5472 | goto handle_close;
|
---|
| 5473 | else
|
---|
| 5474 | goto normal_char;
|
---|
| 5475 |
|
---|
| 5476 |
|
---|
| 5477 | case '\n':
|
---|
| 5478 | if (syntax & RE_NEWLINE_ALT)
|
---|
| 5479 | goto handle_alt;
|
---|
| 5480 | else
|
---|
| 5481 | goto normal_char;
|
---|
| 5482 |
|
---|
| 5483 |
|
---|
| 5484 | case '|':
|
---|
| 5485 | if (syntax & RE_NO_BK_VBAR)
|
---|
| 5486 | goto handle_alt;
|
---|
| 5487 | else
|
---|
| 5488 | goto normal_char;
|
---|
| 5489 |
|
---|
| 5490 |
|
---|
| 5491 | case '{':
|
---|
| 5492 | if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
|
---|
| 5493 | goto handle_interval;
|
---|
| 5494 | else
|
---|
| 5495 | goto normal_char;
|
---|
| 5496 |
|
---|
| 5497 |
|
---|
| 5498 | case '\\':
|
---|
| 5499 | if (p == pend) return REG_EESCAPE;
|
---|
| 5500 |
|
---|
| 5501 | /* Do not translate the character after the \, so that we can
|
---|
| 5502 | distinguish, e.g., \B from \b, even if we normally would
|
---|
| 5503 | translate, e.g., B to b. */
|
---|
| 5504 | PATFETCH_RAW (c);
|
---|
| 5505 |
|
---|
| 5506 | switch (c)
|
---|
| 5507 | {
|
---|
| 5508 | case '(':
|
---|
| 5509 | if (syntax & RE_NO_BK_PARENS)
|
---|
| 5510 | goto normal_backslash;
|
---|
| 5511 |
|
---|
| 5512 | handle_open:
|
---|
| 5513 | rxb->re_nsub++;
|
---|
| 5514 | regnum++;
|
---|
| 5515 | if (COMPILE_STACK_FULL)
|
---|
| 5516 | {
|
---|
| 5517 | ((compile_stack.stack) =
|
---|
| 5518 | (compile_stack_elt_t *) realloc (compile_stack.stack, ( compile_stack.size << 1) * sizeof (
|
---|
| 5519 | compile_stack_elt_t)));
|
---|
| 5520 | if (compile_stack.stack == 0) return REG_ESPACE;
|
---|
| 5521 |
|
---|
| 5522 | compile_stack.size <<= 1;
|
---|
| 5523 | }
|
---|
| 5524 |
|
---|
| 5525 | if (*last_expression)
|
---|
| 5526 | {
|
---|
| 5527 | struct rexp_node * concat
|
---|
| 5528 | = rx_mk_r_concat (&rxb->rx, *last_expression, 0);
|
---|
| 5529 | if (!concat)
|
---|
| 5530 | return REG_ESPACE;
|
---|
| 5531 | *last_expression = concat;
|
---|
| 5532 | last_expression = &concat->params.pair.right;
|
---|
| 5533 | }
|
---|
| 5534 |
|
---|
| 5535 | /*
|
---|
| 5536 | * These are the values to restore when we hit end of this
|
---|
| 5537 | * group.
|
---|
| 5538 | */
|
---|
| 5539 | COMPILE_STACK_TOP.top_expression = top_expression;
|
---|
| 5540 | COMPILE_STACK_TOP.last_expression = last_expression;
|
---|
| 5541 | COMPILE_STACK_TOP.regnum = regnum;
|
---|
| 5542 |
|
---|
| 5543 | compile_stack.avail++;
|
---|
| 5544 |
|
---|
| 5545 | top_expression = last_expression;
|
---|
| 5546 | break;
|
---|
| 5547 |
|
---|
| 5548 |
|
---|
| 5549 | case ')':
|
---|
| 5550 | if (syntax & RE_NO_BK_PARENS) goto normal_backslash;
|
---|
| 5551 |
|
---|
| 5552 | handle_close:
|
---|
| 5553 | /* See similar code for backslashed left paren above. */
|
---|
| 5554 | if (COMPILE_STACK_EMPTY)
|
---|
| 5555 | if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
|
---|
| 5556 | goto normal_char;
|
---|
| 5557 | else
|
---|
| 5558 | return REG_ERPAREN;
|
---|
| 5559 |
|
---|
| 5560 | /* Since we just checked for an empty stack above, this
|
---|
| 5561 | ``can't happen''. */
|
---|
| 5562 |
|
---|
| 5563 | {
|
---|
| 5564 | /* We don't just want to restore into `regnum', because
|
---|
| 5565 | later groups should continue to be numbered higher,
|
---|
| 5566 | as in `(ab)c(de)' -- the second group is #2. */
|
---|
| 5567 | regnum_t this_group_regnum;
|
---|
| 5568 | struct rexp_node ** inner = top_expression;
|
---|
| 5569 |
|
---|
| 5570 | compile_stack.avail--;
|
---|
| 5571 | top_expression = COMPILE_STACK_TOP.top_expression;
|
---|
| 5572 | last_expression = COMPILE_STACK_TOP.last_expression;
|
---|
| 5573 | this_group_regnum = COMPILE_STACK_TOP.regnum;
|
---|
| 5574 | {
|
---|
| 5575 | int left_se = paramc;
|
---|
| 5576 | int right_se = paramc + 1;
|
---|
| 5577 |
|
---|
| 5578 | params = (params
|
---|
| 5579 | ? ((struct re_se_params *)
|
---|
| 5580 | realloc (params,
|
---|
| 5581 | (paramc + 2) * sizeof (params[0])))
|
---|
| 5582 | : ((struct re_se_params *)
|
---|
| 5583 | malloc (2 * sizeof (params[0]))));
|
---|
| 5584 | if (!params)
|
---|
| 5585 | return REG_ESPACE;
|
---|
| 5586 | paramc += 2;
|
---|
| 5587 |
|
---|
| 5588 | params[left_se].se = re_se_lparen;
|
---|
| 5589 | params[left_se].op1 = this_group_regnum;
|
---|
| 5590 | params[right_se].se = re_se_rparen;
|
---|
| 5591 | params[right_se].op1 = this_group_regnum;
|
---|
| 5592 | {
|
---|
| 5593 | struct rexp_node * left
|
---|
| 5594 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5595 | (rx_side_effect)left_se);
|
---|
| 5596 | struct rexp_node * right
|
---|
| 5597 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5598 | (rx_side_effect)right_se);
|
---|
| 5599 | struct rexp_node * c1
|
---|
| 5600 | = (*inner
|
---|
| 5601 | ? rx_mk_r_concat (&rxb->rx, left, *inner) : left);
|
---|
| 5602 | struct rexp_node * c2
|
---|
| 5603 | = rx_mk_r_concat (&rxb->rx, c1, right);
|
---|
| 5604 | if (!(left && right && c1 && c2))
|
---|
| 5605 | return REG_ESPACE;
|
---|
| 5606 | *inner = c2;
|
---|
| 5607 | }
|
---|
| 5608 | }
|
---|
| 5609 | break;
|
---|
| 5610 | }
|
---|
| 5611 |
|
---|
| 5612 | case '|': /* `\|'. */
|
---|
| 5613 | if ((syntax & RE_LIMITED_OPS) || (syntax & RE_NO_BK_VBAR))
|
---|
| 5614 | goto normal_backslash;
|
---|
| 5615 | handle_alt:
|
---|
| 5616 | if (syntax & RE_LIMITED_OPS)
|
---|
| 5617 | goto normal_char;
|
---|
| 5618 |
|
---|
| 5619 | {
|
---|
| 5620 | struct rexp_node * alt
|
---|
| 5621 | = rx_mk_r_alternate (&rxb->rx, *top_expression, 0);
|
---|
| 5622 | if (!alt)
|
---|
| 5623 | return REG_ESPACE;
|
---|
| 5624 | *top_expression = alt;
|
---|
| 5625 | last_expression = &alt->params.pair.right;
|
---|
| 5626 | {
|
---|
| 5627 | int sync_se = paramc;
|
---|
| 5628 |
|
---|
| 5629 | params = (params
|
---|
| 5630 | ? ((struct re_se_params *)
|
---|
| 5631 | realloc (params,
|
---|
| 5632 | (paramc + 1) * sizeof (params[0])))
|
---|
| 5633 | : ((struct re_se_params *)
|
---|
| 5634 | malloc (sizeof (params[0]))));
|
---|
| 5635 | if (!params)
|
---|
| 5636 | return REG_ESPACE;
|
---|
| 5637 | ++paramc;
|
---|
| 5638 |
|
---|
| 5639 | params[sync_se].se = re_se_tv;
|
---|
| 5640 | {
|
---|
| 5641 | struct rexp_node * sync
|
---|
| 5642 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5643 | (rx_side_effect)sync_se);
|
---|
| 5644 | struct rexp_node * conc
|
---|
| 5645 | = rx_mk_r_concat (&rxb->rx, sync, 0);
|
---|
| 5646 |
|
---|
| 5647 | if (!sync || !conc)
|
---|
| 5648 | return REG_ESPACE;
|
---|
| 5649 |
|
---|
| 5650 | *last_expression = conc;
|
---|
| 5651 | last_expression = &conc->params.pair.right;
|
---|
| 5652 | }
|
---|
| 5653 | }
|
---|
| 5654 | }
|
---|
| 5655 | break;
|
---|
| 5656 |
|
---|
| 5657 |
|
---|
| 5658 | case '{':
|
---|
| 5659 | /* If \{ is a literal. */
|
---|
| 5660 | if (!(syntax & RE_INTERVALS)
|
---|
| 5661 | /* If we're at `\{' and it's not the open-interval
|
---|
| 5662 | operator. */
|
---|
| 5663 | || ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
|
---|
| 5664 | || (p - 2 == pattern && p == pend))
|
---|
| 5665 | goto normal_backslash;
|
---|
| 5666 |
|
---|
| 5667 | handle_interval:
|
---|
| 5668 | {
|
---|
| 5669 | /* If got here, then the syntax allows intervals. */
|
---|
| 5670 |
|
---|
| 5671 | /* At least (most) this many matches must be made. */
|
---|
| 5672 | int lower_bound = -1, upper_bound = -1;
|
---|
| 5673 |
|
---|
| 5674 | beg_interval = p - 1;
|
---|
| 5675 |
|
---|
| 5676 | if (p == pend)
|
---|
| 5677 | {
|
---|
| 5678 | if (syntax & RE_NO_BK_BRACES)
|
---|
| 5679 | goto unfetch_interval;
|
---|
| 5680 | else
|
---|
| 5681 | return REG_EBRACE;
|
---|
| 5682 | }
|
---|
| 5683 |
|
---|
| 5684 | GET_UNSIGNED_NUMBER (lower_bound);
|
---|
| 5685 |
|
---|
| 5686 | if (c == ',')
|
---|
| 5687 | {
|
---|
| 5688 | GET_UNSIGNED_NUMBER (upper_bound);
|
---|
| 5689 | if (upper_bound < 0) upper_bound = RE_DUP_MAX;
|
---|
| 5690 | }
|
---|
| 5691 | else
|
---|
| 5692 | /* Interval such as `{1}' => match exactly once. */
|
---|
| 5693 | upper_bound = lower_bound;
|
---|
| 5694 |
|
---|
| 5695 | if (lower_bound < 0 || upper_bound > RE_DUP_MAX
|
---|
| 5696 | || lower_bound > upper_bound)
|
---|
| 5697 | {
|
---|
| 5698 | if (syntax & RE_NO_BK_BRACES)
|
---|
| 5699 | goto unfetch_interval;
|
---|
| 5700 | else
|
---|
| 5701 | return REG_BADBR;
|
---|
| 5702 | }
|
---|
| 5703 |
|
---|
| 5704 | if (!(syntax & RE_NO_BK_BRACES))
|
---|
| 5705 | {
|
---|
| 5706 | if (c != '\\') return REG_EBRACE;
|
---|
| 5707 | PATFETCH (c);
|
---|
| 5708 | }
|
---|
| 5709 |
|
---|
| 5710 | if (c != '}')
|
---|
| 5711 | {
|
---|
| 5712 | if (syntax & RE_NO_BK_BRACES)
|
---|
| 5713 | goto unfetch_interval;
|
---|
| 5714 | else
|
---|
| 5715 | return REG_BADBR;
|
---|
| 5716 | }
|
---|
| 5717 |
|
---|
| 5718 | /* We just parsed a valid interval. */
|
---|
| 5719 |
|
---|
| 5720 | /* If it's invalid to have no preceding re. */
|
---|
| 5721 | if (pointless_if_repeated (*last_expression, params))
|
---|
| 5722 | {
|
---|
| 5723 | if (syntax & RE_CONTEXT_INVALID_OPS)
|
---|
| 5724 | return REG_BADRPT;
|
---|
| 5725 | else if (!(syntax & RE_CONTEXT_INDEP_OPS))
|
---|
| 5726 | goto unfetch_interval;
|
---|
| 5727 | /* was: else laststart = b; */
|
---|
| 5728 | }
|
---|
| 5729 |
|
---|
| 5730 | /* If the upper bound is zero, don't want to iterate
|
---|
| 5731 | * at all.
|
---|
| 5732 | */
|
---|
| 5733 | if (upper_bound == 0)
|
---|
| 5734 | {
|
---|
| 5735 | if (*last_expression)
|
---|
| 5736 | {
|
---|
| 5737 | rx_free_rexp (&rxb->rx, *last_expression);
|
---|
| 5738 | *last_expression = 0;
|
---|
| 5739 | }
|
---|
| 5740 | }
|
---|
| 5741 | else
|
---|
| 5742 | /* Otherwise, we have a nontrivial interval. */
|
---|
| 5743 | {
|
---|
| 5744 | int iter_se = paramc;
|
---|
| 5745 | int end_se = paramc + 1;
|
---|
| 5746 | params = (params
|
---|
| 5747 | ? ((struct re_se_params *)
|
---|
| 5748 | realloc (params,
|
---|
| 5749 | sizeof (*params) * (2 + paramc)))
|
---|
| 5750 | : ((struct re_se_params *)
|
---|
| 5751 | malloc (2 * sizeof (*params))));
|
---|
| 5752 | if (!params)
|
---|
| 5753 | return REG_ESPACE;
|
---|
| 5754 | paramc += 2;
|
---|
| 5755 | params [iter_se].se = re_se_iter;
|
---|
| 5756 | params [iter_se].op1 = lower_bound;
|
---|
| 5757 | params[iter_se].op2 = upper_bound;
|
---|
| 5758 |
|
---|
| 5759 | params[end_se].se = re_se_end_iter;
|
---|
| 5760 | params[end_se].op1 = lower_bound;
|
---|
| 5761 | params[end_se].op2 = upper_bound;
|
---|
| 5762 | {
|
---|
| 5763 | struct rexp_node * push0
|
---|
| 5764 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5765 | (rx_side_effect)re_se_push0);
|
---|
| 5766 | struct rexp_node * start_one_iter
|
---|
| 5767 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5768 | (rx_side_effect)iter_se);
|
---|
| 5769 | struct rexp_node * phase1
|
---|
| 5770 | = rx_mk_r_concat (&rxb->rx, start_one_iter,
|
---|
| 5771 | *last_expression);
|
---|
| 5772 | struct rexp_node * pushback
|
---|
| 5773 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5774 | (rx_side_effect)re_se_pushback);
|
---|
| 5775 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5776 | struct rexp_node * lit_t
|
---|
| 5777 | = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5778 | struct rexp_node * phase2
|
---|
| 5779 | = rx_mk_r_concat (&rxb->rx, pushback, lit_t);
|
---|
| 5780 | struct rexp_node * loop
|
---|
| 5781 | = rx_mk_r_2phase_star (&rxb->rx, phase1, phase2);
|
---|
| 5782 | struct rexp_node * push_n_loop
|
---|
| 5783 | = rx_mk_r_concat (&rxb->rx, push0, loop);
|
---|
| 5784 | struct rexp_node * final_test
|
---|
| 5785 | = rx_mk_r_side_effect (&rxb->rx,
|
---|
| 5786 | (rx_side_effect)end_se);
|
---|
| 5787 | struct rexp_node * full_exp
|
---|
| 5788 | = rx_mk_r_concat (&rxb->rx, push_n_loop, final_test);
|
---|
| 5789 |
|
---|
| 5790 | if (!(push0 && start_one_iter && phase1
|
---|
| 5791 | && pushback && lit_t && phase2
|
---|
| 5792 | && loop && push_n_loop && final_test && full_exp))
|
---|
| 5793 | return REG_ESPACE;
|
---|
| 5794 |
|
---|
| 5795 | RX_bitset_enjoin(cs, 't');
|
---|
| 5796 |
|
---|
| 5797 | *last_expression = full_exp;
|
---|
| 5798 | }
|
---|
| 5799 | }
|
---|
| 5800 | beg_interval = 0;
|
---|
| 5801 | }
|
---|
| 5802 | break;
|
---|
| 5803 |
|
---|
| 5804 | unfetch_interval:
|
---|
| 5805 | /* If an invalid interval, match the characters as literals. */
|
---|
| 5806 | p = beg_interval;
|
---|
| 5807 | beg_interval = 0;
|
---|
| 5808 |
|
---|
| 5809 | /* normal_char and normal_backslash need `c'. */
|
---|
| 5810 | PATFETCH (c);
|
---|
| 5811 |
|
---|
| 5812 | if (!(syntax & RE_NO_BK_BRACES))
|
---|
| 5813 | {
|
---|
| 5814 | if (p > pattern && p[-1] == '\\')
|
---|
| 5815 | goto normal_backslash;
|
---|
| 5816 | }
|
---|
| 5817 | goto normal_char;
|
---|
| 5818 |
|
---|
| 5819 | #ifdef emacs
|
---|
| 5820 | /* There is no way to specify the before_dot and after_dot
|
---|
| 5821 | operators. rms says this is ok. --karl */
|
---|
| 5822 | case '=':
|
---|
| 5823 | side = (rx_side_effect)rx_se_at_dot;
|
---|
| 5824 | goto add_side_effect;
|
---|
| 5825 | break;
|
---|
| 5826 |
|
---|
| 5827 | case 's':
|
---|
| 5828 | case 'S':
|
---|
| 5829 | {
|
---|
| 5830 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5831 | struct rexp_node * set = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5832 | if (!(cs && set))
|
---|
| 5833 | return REG_ESPACE;
|
---|
| 5834 | if (c == 'S')
|
---|
| 5835 | rx_bitset_universe (rxb->rx.local_cset_size, cs);
|
---|
| 5836 |
|
---|
| 5837 | PATFETCH (c);
|
---|
| 5838 | {
|
---|
| 5839 | int x;
|
---|
| 5840 | enum syntaxcode code = syntax_spec_code [c];
|
---|
| 5841 | for (x = 0; x < 256; ++x)
|
---|
| 5842 | {
|
---|
| 5843 |
|
---|
| 5844 | if (SYNTAX (x) == code)
|
---|
| 5845 | {
|
---|
| 5846 | rx_Bitset it =
|
---|
| 5847 | inverse_translation (rxb, validate_inv_tr,
|
---|
| 5848 | inverse_translate,
|
---|
| 5849 | translate, x);
|
---|
| 5850 | rx_bitset_xor (rxb->rx.local_cset_size, cs, it);
|
---|
| 5851 | }
|
---|
| 5852 | }
|
---|
| 5853 | }
|
---|
| 5854 | append = set;
|
---|
| 5855 | goto append_node;
|
---|
| 5856 | }
|
---|
| 5857 | break;
|
---|
| 5858 | #endif /* emacs */
|
---|
| 5859 |
|
---|
| 5860 |
|
---|
| 5861 | case 'w':
|
---|
| 5862 | case 'W':
|
---|
| 5863 | {
|
---|
| 5864 | rx_Bitset cs = rx_cset (&rxb->rx);
|
---|
| 5865 | struct rexp_node * n = (cs ? rx_mk_r_cset (&rxb->rx, cs) : 0);
|
---|
| 5866 | if (!(cs && n))
|
---|
| 5867 | return REG_ESPACE;
|
---|
| 5868 | if (c == 'W')
|
---|
| 5869 | rx_bitset_universe (rxb->rx.local_cset_size ,cs);
|
---|
| 5870 | {
|
---|
| 5871 | int x;
|
---|
| 5872 | for (x = rxb->rx.local_cset_size - 1; x > 0; --x)
|
---|
| 5873 | if (SYNTAX(x) & Sword)
|
---|
| 5874 | RX_bitset_toggle (cs, x);
|
---|
| 5875 | }
|
---|
| 5876 | append = n;
|
---|
| 5877 | goto append_node;
|
---|
| 5878 | }
|
---|
| 5879 | break;
|
---|
| 5880 |
|
---|
| 5881 | /* With a little extra work, some of these side effects could be optimized
|
---|
| 5882 | * away (basicly by looking at what we already know about the surrounding
|
---|
| 5883 | * chars).
|
---|
| 5884 | */
|
---|
| 5885 | case '<':
|
---|
| 5886 | side = (rx_side_effect)re_se_wordbeg;
|
---|
| 5887 | goto add_side_effect;
|
---|
| 5888 | break;
|
---|
| 5889 |
|
---|
| 5890 | case '>':
|
---|
| 5891 | side = (rx_side_effect)re_se_wordend;
|
---|
| 5892 | goto add_side_effect;
|
---|
| 5893 | break;
|
---|
| 5894 |
|
---|
| 5895 | case 'b':
|
---|
| 5896 | side = (rx_side_effect)re_se_wordbound;
|
---|
| 5897 | goto add_side_effect;
|
---|
| 5898 | break;
|
---|
| 5899 |
|
---|
| 5900 | case 'B':
|
---|
| 5901 | side = (rx_side_effect)re_se_notwordbound;
|
---|
| 5902 | goto add_side_effect;
|
---|
| 5903 | break;
|
---|
| 5904 |
|
---|
| 5905 | case '`':
|
---|
| 5906 | side = (rx_side_effect)re_se_begbuf;
|
---|
| 5907 | goto add_side_effect;
|
---|
| 5908 | break;
|
---|
| 5909 |
|
---|
| 5910 | case '\'':
|
---|
| 5911 | side = (rx_side_effect)re_se_endbuf;
|
---|
| 5912 | goto add_side_effect;
|
---|
| 5913 | break;
|
---|
| 5914 |
|
---|
| 5915 | add_side_effect:
|
---|
| 5916 | {
|
---|
| 5917 | struct rexp_node * se
|
---|
| 5918 | = rx_mk_r_side_effect (&rxb->rx, side);
|
---|
| 5919 | if (!se)
|
---|
| 5920 | return REG_ESPACE;
|
---|
| 5921 | append = se;
|
---|
| 5922 | goto append_node;
|
---|
| 5923 | }
|
---|
| 5924 | break;
|
---|
| 5925 |
|
---|
| 5926 | case '1': case '2': case '3': case '4': case '5':
|
---|
| 5927 | case '6': case '7': case '8': case '9':
|
---|
| 5928 | if (syntax & RE_NO_BK_REFS)
|
---|
| 5929 | goto normal_char;
|
---|
| 5930 |
|
---|
| 5931 | c1 = c - '0';
|
---|
| 5932 |
|
---|
| 5933 | if (c1 > regnum)
|
---|
| 5934 | return REG_ESUBREG;
|
---|
| 5935 |
|
---|
| 5936 | /* Can't back reference to a subexpression if inside of it. */
|
---|
| 5937 | if (group_in_compile_stack (compile_stack, c1))
|
---|
| 5938 | return REG_ESUBREG;
|
---|
| 5939 |
|
---|
| 5940 | {
|
---|
| 5941 | int backref_se = paramc;
|
---|
| 5942 | params = (params
|
---|
| 5943 | ? ((struct re_se_params *)
|
---|
| 5944 | realloc (params,
|
---|
| 5945 | sizeof (*params) * (1 + paramc)))
|
---|
| 5946 | : ((struct re_se_params *)
|
---|
| 5947 | malloc (sizeof (*params))));
|
---|
| 5948 | if (!params)
|
---|
| 5949 | return REG_ESPACE;
|
---|
| 5950 | ++paramc;
|
---|
| 5951 | params[backref_se].se = re_se_backref;
|
---|
| 5952 | params[backref_se].op1 = c1;
|
---|
| 5953 | side = (rx_side_effect)backref_se;
|
---|
| 5954 | goto add_side_effect;
|
---|
| 5955 | }
|
---|
| 5956 | break;
|
---|
| 5957 |
|
---|
| 5958 | case '+':
|
---|
| 5959 | case '?':
|
---|
| 5960 | if (syntax & RE_BK_PLUS_QM)
|
---|
| 5961 | goto handle_plus;
|
---|
| 5962 | else
|
---|
| 5963 | goto normal_backslash;
|
---|
| 5964 |
|
---|
| 5965 | default:
|
---|
| 5966 | normal_backslash:
|
---|
| 5967 | /* You might think it would be useful for \ to mean
|
---|
| 5968 | not to translate; but if we don't translate it
|
---|
| 5969 | it will never match anything. */
|
---|
| 5970 | c = TRANSLATE (c);
|
---|
| 5971 | goto normal_char;
|
---|
| 5972 | }
|
---|
| 5973 | break;
|
---|
| 5974 |
|
---|
| 5975 |
|
---|
| 5976 | default:
|
---|
| 5977 | /* Expects the character in `c'. */
|
---|
| 5978 | normal_char:
|
---|
| 5979 | {
|
---|
| 5980 | rx_Bitset cs = rx_cset(&rxb->rx);
|
---|
| 5981 | struct rexp_node * match = rx_mk_r_cset (&rxb->rx, cs);
|
---|
| 5982 | rx_Bitset it;
|
---|
| 5983 | if (!(cs && match))
|
---|
| 5984 | return REG_ESPACE;
|
---|
| 5985 | it = inverse_translation (rxb, validate_inv_tr,
|
---|
| 5986 | inverse_translate, translate, c);
|
---|
| 5987 | rx_bitset_union (CHAR_SET_SIZE, cs, it);
|
---|
| 5988 | append = match;
|
---|
| 5989 |
|
---|
| 5990 | append_node:
|
---|
| 5991 | /* This genericly appends the rexp APPEND to *LAST_EXPRESSION
|
---|
| 5992 | * and then parses the next character normally.
|
---|
| 5993 | */
|
---|
| 5994 | if (*last_expression)
|
---|
| 5995 | {
|
---|
| 5996 | struct rexp_node * concat
|
---|
| 5997 | = rx_mk_r_concat (&rxb->rx, *last_expression, append);
|
---|
| 5998 | if (!concat)
|
---|
| 5999 | return REG_ESPACE;
|
---|
| 6000 | *last_expression = concat;
|
---|
| 6001 | last_expression = &concat->params.pair.right;
|
---|
| 6002 | }
|
---|
| 6003 | else
|
---|
| 6004 | *last_expression = append;
|
---|
| 6005 | }
|
---|
| 6006 | } /* switch (c) */
|
---|
| 6007 | } /* while p != pend */
|
---|
| 6008 |
|
---|
| 6009 |
|
---|
| 6010 | {
|
---|
| 6011 | int win_se = paramc;
|
---|
| 6012 | params = (params
|
---|
| 6013 | ? ((struct re_se_params *)
|
---|
| 6014 | realloc (params,
|
---|
| 6015 | sizeof (*params) * (1 + paramc)))
|
---|
| 6016 | : ((struct re_se_params *)
|
---|
| 6017 | malloc (sizeof (*params))));
|
---|
| 6018 | if (!params)
|
---|
| 6019 | return REG_ESPACE;
|
---|
| 6020 | ++paramc;
|
---|
| 6021 | params[win_se].se = re_se_win;
|
---|
| 6022 | {
|
---|
| 6023 | struct rexp_node * se
|
---|
| 6024 | = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)win_se);
|
---|
| 6025 | struct rexp_node * concat
|
---|
| 6026 | = rx_mk_r_concat (&rxb->rx, rexp, se);
|
---|
| 6027 | if (!(se && concat))
|
---|
| 6028 | return REG_ESPACE;
|
---|
| 6029 | rexp = concat;
|
---|
| 6030 | }
|
---|
| 6031 | }
|
---|
| 6032 |
|
---|
| 6033 |
|
---|
| 6034 | /* Through the pattern now. */
|
---|
| 6035 |
|
---|
| 6036 | if (!COMPILE_STACK_EMPTY)
|
---|
| 6037 | return REG_EPAREN;
|
---|
| 6038 |
|
---|
| 6039 | free (compile_stack.stack);
|
---|
| 6040 |
|
---|
| 6041 | orig_rexp = rexp;
|
---|
| 6042 | #ifdef RX_DEBUG
|
---|
| 6043 | if (rx_debug_compile)
|
---|
| 6044 | {
|
---|
| 6045 | dbug_rxb = rxb;
|
---|
| 6046 | fputs ("\n\nCompiling ", stdout);
|
---|
| 6047 | fwrite (pattern, 1, size, stdout);
|
---|
| 6048 | fputs (":\n", stdout);
|
---|
| 6049 | rxb->se_params = params;
|
---|
| 6050 | print_rexp (&rxb->rx, orig_rexp, 2, re_seprint, stdout);
|
---|
| 6051 | }
|
---|
| 6052 | #endif
|
---|
| 6053 | {
|
---|
| 6054 | rx_Bitset cs = rx_cset(&rxb->rx);
|
---|
| 6055 | rx_Bitset cs2 = rx_cset(&rxb->rx);
|
---|
| 6056 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 6057 | char * se_map = (char *) _alloca (paramc);
|
---|
| 6058 | #else
|
---|
| 6059 | char * se_map = (char *) alloca (paramc);
|
---|
| 6060 | #endif
|
---|
| 6061 | struct rexp_node * new_rexp = 0;
|
---|
| 6062 |
|
---|
| 6063 |
|
---|
| 6064 | bzero (se_map, paramc);
|
---|
| 6065 | find_backrefs (se_map, rexp, params);
|
---|
| 6066 | fewer_side_effects =
|
---|
| 6067 | remove_unecessary_side_effects (&rxb->rx, se_map,
|
---|
| 6068 | rx_copy_rexp (&rxb->rx, rexp), params);
|
---|
| 6069 |
|
---|
| 6070 | speed_up_alt (&rxb->rx, rexp, 0);
|
---|
| 6071 | speed_up_alt (&rxb->rx, fewer_side_effects, 1);
|
---|
| 6072 |
|
---|
| 6073 | {
|
---|
| 6074 | char * syntax_parens = rxb->syntax_parens;
|
---|
| 6075 | if (syntax_parens == (char *)0x1)
|
---|
| 6076 | rexp = remove_unecessary_side_effects
|
---|
| 6077 | (&rxb->rx, se_map, rexp, params);
|
---|
| 6078 | else if (syntax_parens)
|
---|
| 6079 | {
|
---|
| 6080 | int x;
|
---|
| 6081 | for (x = 0; x < paramc; ++x)
|
---|
| 6082 | if (( (params[x].se == re_se_lparen)
|
---|
| 6083 | || (params[x].se == re_se_rparen))
|
---|
| 6084 | && (!syntax_parens [params[x].op1]))
|
---|
| 6085 | se_map [x] = 1;
|
---|
| 6086 | rexp = remove_unecessary_side_effects
|
---|
| 6087 | (&rxb->rx, se_map, rexp, params);
|
---|
| 6088 | }
|
---|
| 6089 | }
|
---|
| 6090 |
|
---|
| 6091 | /* At least one more optimization would be nice to have here but i ran out
|
---|
| 6092 | * of time. The idea would be to delay side effects.
|
---|
| 6093 | * For examle, `(abc)' is the same thing as `abc()' except that the
|
---|
| 6094 | * left paren is offset by 3 (which we know at compile time).
|
---|
| 6095 | * (In this comment, write that second pattern `abc(:3:)'
|
---|
| 6096 | * where `(:3:' is a syntactic unit.)
|
---|
| 6097 | *
|
---|
| 6098 | * Trickier: `(abc|defg)' is the same as `(abc(:3:|defg(:4:))'
|
---|
| 6099 | * (The paren nesting may be hard to follow -- that's an alternation
|
---|
| 6100 | * of `abc(:3:' and `defg(:4:' inside (purely syntactic) parens
|
---|
| 6101 | * followed by the closing paren from the original expression.)
|
---|
| 6102 | *
|
---|
| 6103 | * Neither the expression tree representation nor the the nfa make
|
---|
| 6104 | * this very easy to write. :(
|
---|
| 6105 | */
|
---|
| 6106 |
|
---|
| 6107 | /* What we compile is different than what the parser returns.
|
---|
| 6108 | * Suppose the parser returns expression R.
|
---|
| 6109 | * Let R' be R with unnecessary register assignments removed
|
---|
| 6110 | * (see REMOVE_UNECESSARY_SIDE_EFFECTS, above).
|
---|
| 6111 | *
|
---|
| 6112 | * What we will compile is the expression:
|
---|
| 6113 | *
|
---|
| 6114 | * m{try}R{win}\|s{try}R'{win}
|
---|
| 6115 | *
|
---|
| 6116 | * {try} and {win} denote side effect epsilons (see EXPLORE_FUTURE).
|
---|
| 6117 | *
|
---|
| 6118 | * When trying a match, we insert an `m' at the beginning of the
|
---|
| 6119 | * string if the user wants registers to be filled, `s' if not.
|
---|
| 6120 | */
|
---|
| 6121 | new_rexp =
|
---|
| 6122 | rx_mk_r_alternate
|
---|
| 6123 | (&rxb->rx,
|
---|
| 6124 | rx_mk_r_concat (&rxb->rx, rx_mk_r_cset (&rxb->rx, cs2), rexp),
|
---|
| 6125 | rx_mk_r_concat (&rxb->rx,
|
---|
| 6126 | rx_mk_r_cset (&rxb->rx, cs), fewer_side_effects));
|
---|
| 6127 |
|
---|
| 6128 | if (!(new_rexp && cs && cs2))
|
---|
| 6129 | return REG_ESPACE;
|
---|
| 6130 | RX_bitset_enjoin (cs2, '\0'); /* prefixed to the rexp used for matching. */
|
---|
| 6131 | RX_bitset_enjoin (cs, '\1'); /* prefixed to the rexp used for searching. */
|
---|
| 6132 | rexp = new_rexp;
|
---|
| 6133 | }
|
---|
| 6134 |
|
---|
| 6135 | #ifdef RX_DEBUG
|
---|
| 6136 | if (rx_debug_compile)
|
---|
| 6137 | {
|
---|
| 6138 | fputs ("\n...which is compiled as:\n", stdout);
|
---|
| 6139 | print_rexp (&rxb->rx, rexp, 2, re_seprint, stdout);
|
---|
| 6140 | }
|
---|
| 6141 | #endif
|
---|
| 6142 | {
|
---|
| 6143 | struct rx_nfa_state *start = 0;
|
---|
| 6144 | struct rx_nfa_state *end = 0;
|
---|
| 6145 |
|
---|
| 6146 | if (!rx_build_nfa (&rxb->rx, rexp, &start, &end))
|
---|
| 6147 | return REG_ESPACE; /* */
|
---|
| 6148 | else
|
---|
| 6149 | {
|
---|
| 6150 | void * mem = (void *)rxb->buffer;
|
---|
| 6151 | unsigned long size = rxb->allocated;
|
---|
| 6152 | int start_id;
|
---|
| 6153 | char * perm_mem;
|
---|
| 6154 | int iterator_size = paramc * sizeof (params[0]);
|
---|
| 6155 |
|
---|
| 6156 | end->is_final = 1;
|
---|
| 6157 | start->is_start = 1;
|
---|
| 6158 | rx_name_nfa_states (&rxb->rx);
|
---|
| 6159 | start_id = start->id;
|
---|
| 6160 | #ifdef RX_DEBUG
|
---|
| 6161 | if (rx_debug_compile)
|
---|
| 6162 | {
|
---|
| 6163 | fputs ("...giving the NFA: \n", stdout);
|
---|
| 6164 | dbug_rxb = rxb;
|
---|
| 6165 | print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
|
---|
| 6166 | }
|
---|
| 6167 | #endif
|
---|
| 6168 | if (!rx_eclose_nfa (&rxb->rx))
|
---|
| 6169 | return REG_ESPACE;
|
---|
| 6170 | else
|
---|
| 6171 | {
|
---|
| 6172 | rx_delete_epsilon_transitions (&rxb->rx);
|
---|
| 6173 |
|
---|
| 6174 | /* For compatability reasons, we need to shove the
|
---|
| 6175 | * compiled nfa into one chunk of malloced memory.
|
---|
| 6176 | */
|
---|
| 6177 | rxb->rx.reserved = ( sizeof (params[0]) * paramc
|
---|
| 6178 | + rx_sizeof_bitset (rxb->rx.local_cset_size));
|
---|
| 6179 | #ifdef RX_DEBUG
|
---|
| 6180 | if (rx_debug_compile)
|
---|
| 6181 | {
|
---|
| 6182 | dbug_rxb = rxb;
|
---|
| 6183 | fputs ("...which cooks down (uncompactified) to: \n", stdout);
|
---|
| 6184 | print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
|
---|
| 6185 | }
|
---|
| 6186 | #endif
|
---|
| 6187 | if (!rx_compactify_nfa (&rxb->rx, &mem, &size))
|
---|
| 6188 | return REG_ESPACE;
|
---|
| 6189 | rxb->buffer = mem;
|
---|
| 6190 | rxb->allocated = size;
|
---|
| 6191 | rxb->rx.buffer = mem;
|
---|
| 6192 | rxb->rx.allocated = size;
|
---|
| 6193 | perm_mem = ((char *)rxb->rx.buffer
|
---|
| 6194 | + rxb->rx.allocated - rxb->rx.reserved);
|
---|
| 6195 | rxb->se_params = ((struct re_se_params *)perm_mem);
|
---|
| 6196 | bcopy (params, rxb->se_params, iterator_size);
|
---|
| 6197 | perm_mem += iterator_size;
|
---|
| 6198 | rxb->fastset = (rx_Bitset) perm_mem;
|
---|
| 6199 | rxb->start = rx_id_to_nfa_state (&rxb->rx, start_id);
|
---|
| 6200 | }
|
---|
| 6201 | rx_bitset_null (rxb->rx.local_cset_size, rxb->fastset);
|
---|
| 6202 | rxb->can_match_empty = compute_fastset (rxb, orig_rexp);
|
---|
| 6203 | rxb->match_regs_on_stack =
|
---|
| 6204 | registers_on_stack (rxb, orig_rexp, 0, params);
|
---|
| 6205 | rxb->search_regs_on_stack =
|
---|
| 6206 | registers_on_stack (rxb, fewer_side_effects, 0, params);
|
---|
| 6207 | if (rxb->can_match_empty)
|
---|
| 6208 | rx_bitset_universe (rxb->rx.local_cset_size, rxb->fastset);
|
---|
| 6209 | rxb->is_anchored = is_anchored (orig_rexp, (rx_side_effect) re_se_hat);
|
---|
| 6210 | rxb->begbuf_only = is_anchored (orig_rexp,
|
---|
| 6211 | (rx_side_effect) re_se_begbuf);
|
---|
| 6212 | }
|
---|
| 6213 | rx_free_rexp (&rxb->rx, rexp);
|
---|
| 6214 | if (params)
|
---|
| 6215 | free (params);
|
---|
| 6216 | #ifdef RX_DEBUG
|
---|
| 6217 | if (rx_debug_compile)
|
---|
| 6218 | {
|
---|
| 6219 | dbug_rxb = rxb;
|
---|
| 6220 | fputs ("...which cooks down to: \n", stdout);
|
---|
| 6221 | print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
|
---|
| 6222 | }
|
---|
| 6223 | #endif
|
---|
| 6224 | }
|
---|
| 6225 | return REG_NOERROR;
|
---|
| 6226 | }
|
---|
| 6227 |
|
---|
| 6228 | |
---|
| 6229 |
|
---|
| 6230 |
|
---|
| 6231 | /* This table gives an error message for each of the error codes listed
|
---|
| 6232 | in regex.h. Obviously the order here has to be same as there. */
|
---|
| 6233 |
|
---|
| 6234 | __const__ char * rx_error_msg[] =
|
---|
| 6235 | { 0, /* REG_NOERROR */
|
---|
| 6236 | "No match", /* REG_NOMATCH */
|
---|
| 6237 | "Invalid regular expression", /* REG_BADPAT */
|
---|
| 6238 | "Invalid collation character", /* REG_ECOLLATE */
|
---|
| 6239 | "Invalid character class name", /* REG_ECTYPE */
|
---|
| 6240 | "Trailing backslash", /* REG_EESCAPE */
|
---|
| 6241 | "Invalid back reference", /* REG_ESUBREG */
|
---|
| 6242 | "Unmatched [ or [^", /* REG_EBRACK */
|
---|
| 6243 | "Unmatched ( or \\(", /* REG_EPAREN */
|
---|
| 6244 | "Unmatched \\{", /* REG_EBRACE */
|
---|
| 6245 | "Invalid content of \\{\\}", /* REG_BADBR */
|
---|
| 6246 | "Invalid range end", /* REG_ERANGE */
|
---|
| 6247 | "Memory exhausted", /* REG_ESPACE */
|
---|
| 6248 | "Invalid preceding regular expression", /* REG_BADRPT */
|
---|
| 6249 | "Premature end of regular expression", /* REG_EEND */
|
---|
| 6250 | "Regular expression too big", /* REG_ESIZE */
|
---|
| 6251 | "Unmatched ) or \\)", /* REG_ERPAREN */
|
---|
| 6252 | };
|
---|
| 6253 |
|
---|
| 6254 | |
---|
| 6255 |
|
---|
| 6256 |
|
---|
| 6257 |
|
---|
| 6258 | char rx_slowmap [256] =
|
---|
| 6259 | {
|
---|
| 6260 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6261 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6262 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6263 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6264 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6265 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6266 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6267 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6268 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6269 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6270 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6271 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6272 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6273 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6274 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6275 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
---|
| 6276 | };
|
---|
| 6277 |
|
---|
| 6278 | #ifdef __STDC__
|
---|
| 6279 | RX_DECL void
|
---|
| 6280 | rx_blow_up_fastmap (struct re_pattern_buffer * rxb)
|
---|
| 6281 | #else
|
---|
| 6282 | RX_DECL void
|
---|
| 6283 | rx_blow_up_fastmap (rxb)
|
---|
| 6284 | struct re_pattern_buffer * rxb;
|
---|
| 6285 | #endif
|
---|
| 6286 | {
|
---|
| 6287 | int x;
|
---|
| 6288 | for (x = 0; x < 256; ++x) /* &&&& 3.6 % */
|
---|
| 6289 | rxb->fastmap [x] = !!RX_bitset_member (rxb->fastset, x);
|
---|
| 6290 | rxb->fastmap_accurate = 1;
|
---|
| 6291 | }
|
---|
| 6292 |
|
---|
| 6293 |
|
---|
| 6294 | |
---|
| 6295 |
|
---|
| 6296 |
|
---|
| 6297 | #if !defined(REGEX_MALLOC) && !defined(__GNUC__)
|
---|
| 6298 | #define RE_SEARCH_2_FN inner_re_search_2
|
---|
| 6299 | #define RE_S2_QUAL static
|
---|
| 6300 | #else
|
---|
| 6301 | #define RE_SEARCH_2_FN re_search_2
|
---|
| 6302 | #define RE_S2_QUAL
|
---|
| 6303 | #endif
|
---|
| 6304 |
|
---|
| 6305 | struct re_search_2_closure
|
---|
| 6306 | {
|
---|
| 6307 | __const__ char * string1;
|
---|
| 6308 | int size1;
|
---|
| 6309 | __const__ char * string2;
|
---|
| 6310 | int size2;
|
---|
| 6311 | };
|
---|
| 6312 |
|
---|
| 6313 |
|
---|
| 6314 | static __inline__ enum rx_get_burst_return
|
---|
| 6315 | re_search_2_get_burst (pos, vclosure, stop)
|
---|
| 6316 | struct rx_string_position * pos;
|
---|
| 6317 | void * vclosure;
|
---|
| 6318 | int stop;
|
---|
| 6319 | {
|
---|
| 6320 | struct re_search_2_closure * closure;
|
---|
| 6321 | closure = (struct re_search_2_closure *)vclosure;
|
---|
| 6322 | if (!closure->string2)
|
---|
| 6323 | {
|
---|
| 6324 | int inset;
|
---|
| 6325 |
|
---|
| 6326 | inset = pos->pos - pos->string;
|
---|
| 6327 | if ((inset < -1) || (inset > closure->size1))
|
---|
| 6328 | return rx_get_burst_no_more;
|
---|
| 6329 | else
|
---|
| 6330 | {
|
---|
| 6331 | pos->pos = (__const__ unsigned char *) closure->string1 + inset;
|
---|
| 6332 | pos->string = (__const__ unsigned char *) closure->string1;
|
---|
| 6333 | pos->size = closure->size1;
|
---|
| 6334 | pos->end = ((__const__ unsigned char *)
|
---|
| 6335 | MIN(closure->string1 + closure->size1,
|
---|
| 6336 | closure->string1 + stop));
|
---|
| 6337 | pos->offset = 0;
|
---|
| 6338 | return ((pos->pos < pos->end)
|
---|
| 6339 | ? rx_get_burst_ok
|
---|
| 6340 | : rx_get_burst_no_more);
|
---|
| 6341 | }
|
---|
| 6342 | }
|
---|
| 6343 | else if (!closure->string1)
|
---|
| 6344 | {
|
---|
| 6345 | int inset;
|
---|
| 6346 |
|
---|
| 6347 | inset = pos->pos - pos->string;
|
---|
| 6348 | pos->pos = (__const__ unsigned char *) closure->string2 + inset;
|
---|
| 6349 | pos->string = (__const__ unsigned char *) closure->string2;
|
---|
| 6350 | pos->size = closure->size2;
|
---|
| 6351 | pos->end = ((__const__ unsigned char *)
|
---|
| 6352 | MIN(closure->string2 + closure->size2,
|
---|
| 6353 | closure->string2 + stop));
|
---|
| 6354 | pos->offset = 0;
|
---|
| 6355 | return ((pos->pos < pos->end)
|
---|
| 6356 | ? rx_get_burst_ok
|
---|
| 6357 | : rx_get_burst_no_more);
|
---|
| 6358 | }
|
---|
| 6359 | else
|
---|
| 6360 | {
|
---|
| 6361 | int inset;
|
---|
| 6362 |
|
---|
| 6363 | inset = pos->pos - pos->string + pos->offset;
|
---|
| 6364 | if (inset < closure->size1)
|
---|
| 6365 | {
|
---|
| 6366 | pos->pos = (__const__ unsigned char *) closure->string1 + inset;
|
---|
| 6367 | pos->string = (__const__ unsigned char *) closure->string1;
|
---|
| 6368 | pos->size = closure->size1;
|
---|
| 6369 | pos->end = ((__const__ unsigned char *)
|
---|
| 6370 | MIN(closure->string1 + closure->size1,
|
---|
| 6371 | closure->string1 + stop));
|
---|
| 6372 | pos->offset = 0;
|
---|
| 6373 | return rx_get_burst_ok;
|
---|
| 6374 | }
|
---|
| 6375 | else
|
---|
| 6376 | {
|
---|
| 6377 | pos->pos = ((__const__ unsigned char *)
|
---|
| 6378 | closure->string2 + inset - closure->size1);
|
---|
| 6379 | pos->string = (__const__ unsigned char *) closure->string2;
|
---|
| 6380 | pos->size = closure->size2;
|
---|
| 6381 | pos->end = ((__const__ unsigned char *)
|
---|
| 6382 | MIN(closure->string2 + closure->size2,
|
---|
| 6383 | closure->string2 + stop - closure->size1));
|
---|
| 6384 | pos->offset = closure->size1;
|
---|
| 6385 | return ((pos->pos < pos->end)
|
---|
| 6386 | ? rx_get_burst_ok
|
---|
| 6387 | : rx_get_burst_no_more);
|
---|
| 6388 | }
|
---|
| 6389 | }
|
---|
| 6390 | }
|
---|
| 6391 |
|
---|
| 6392 |
|
---|
| 6393 | static __inline__ enum rx_back_check_return
|
---|
| 6394 | re_search_2_back_check (pos, lparen, rparen, translate, vclosure, stop)
|
---|
| 6395 | struct rx_string_position * pos;
|
---|
| 6396 | int lparen;
|
---|
| 6397 | int rparen;
|
---|
| 6398 | unsigned char * translate;
|
---|
| 6399 | void * vclosure;
|
---|
| 6400 | int stop;
|
---|
| 6401 | {
|
---|
| 6402 | struct rx_string_position there;
|
---|
| 6403 | struct rx_string_position past;
|
---|
| 6404 |
|
---|
| 6405 | there = *pos;
|
---|
| 6406 | there.pos = there.string + lparen - there.offset;
|
---|
| 6407 | re_search_2_get_burst (&there, vclosure, stop);
|
---|
| 6408 |
|
---|
| 6409 | past = *pos;
|
---|
| 6410 | past.pos = past.string + rparen - there.offset;
|
---|
| 6411 | re_search_2_get_burst (&past, vclosure, stop);
|
---|
| 6412 |
|
---|
| 6413 | ++pos->pos;
|
---|
| 6414 | re_search_2_get_burst (pos, vclosure, stop);
|
---|
| 6415 |
|
---|
| 6416 | while ( (there.pos != past.pos)
|
---|
| 6417 | && (pos->pos != pos->end))
|
---|
| 6418 | if (TRANSLATE(*there.pos) != TRANSLATE(*pos->pos))
|
---|
| 6419 | return rx_back_check_fail;
|
---|
| 6420 | else
|
---|
| 6421 | {
|
---|
| 6422 | ++there.pos;
|
---|
| 6423 | ++pos->pos;
|
---|
| 6424 | if (there.pos == there.end)
|
---|
| 6425 | re_search_2_get_burst (&there, vclosure, stop);
|
---|
| 6426 | if (pos->pos == pos->end)
|
---|
| 6427 | re_search_2_get_burst (pos, vclosure, stop);
|
---|
| 6428 | }
|
---|
| 6429 |
|
---|
| 6430 | if (there.pos != past.pos)
|
---|
| 6431 | return rx_back_check_fail;
|
---|
| 6432 | --pos->pos;
|
---|
| 6433 | re_search_2_get_burst (pos, vclosure, stop);
|
---|
| 6434 | return rx_back_check_pass;
|
---|
| 6435 | }
|
---|
| 6436 |
|
---|
| 6437 | static __inline__ int
|
---|
| 6438 | re_search_2_fetch_char (pos, offset, app_closure, stop)
|
---|
| 6439 | struct rx_string_position * pos;
|
---|
| 6440 | int offset;
|
---|
| 6441 | void * app_closure;
|
---|
| 6442 | int stop;
|
---|
| 6443 | {
|
---|
| 6444 | struct re_search_2_closure * closure;
|
---|
| 6445 | closure = (struct re_search_2_closure *)app_closure;
|
---|
| 6446 | if (offset == 0)
|
---|
| 6447 | {
|
---|
| 6448 | if (pos->pos >= pos->string)
|
---|
| 6449 | return *pos->pos;
|
---|
| 6450 | else
|
---|
| 6451 | {
|
---|
| 6452 | if ( (pos->string == (__const__ unsigned char *) closure->string2)
|
---|
| 6453 | && (closure->string1)
|
---|
| 6454 | && (closure->size1))
|
---|
| 6455 | return closure->string1[closure->size1 - 1];
|
---|
| 6456 | else
|
---|
| 6457 | return 0; /* sure, why not. */
|
---|
| 6458 | }
|
---|
| 6459 | }
|
---|
| 6460 | if (pos->pos == pos->end)
|
---|
| 6461 | return *closure->string2;
|
---|
| 6462 | else
|
---|
| 6463 | return pos->pos[1];
|
---|
| 6464 | }
|
---|
| 6465 |
|
---|
| 6466 |
|
---|
| 6467 | #ifdef __STDC__
|
---|
| 6468 | RE_S2_QUAL int
|
---|
| 6469 | RE_SEARCH_2_FN (struct re_pattern_buffer *rxb,
|
---|
| 6470 | __const__ char * string1, int size1,
|
---|
| 6471 | __const__ char * string2, int size2,
|
---|
| 6472 | int startpos, int range,
|
---|
| 6473 | struct re_registers *regs,
|
---|
| 6474 | int stop)
|
---|
| 6475 | #else
|
---|
| 6476 | RE_S2_QUAL int
|
---|
| 6477 | RE_SEARCH_2_FN (rxb,
|
---|
| 6478 | string1, size1, string2, size2, startpos, range, regs, stop)
|
---|
| 6479 | struct re_pattern_buffer *rxb;
|
---|
| 6480 | __const__ char * string1;
|
---|
| 6481 | int size1;
|
---|
| 6482 | __const__ char * string2;
|
---|
| 6483 | int size2;
|
---|
| 6484 | int startpos;
|
---|
| 6485 | int range;
|
---|
| 6486 | struct re_registers *regs;
|
---|
| 6487 | int stop;
|
---|
| 6488 | #endif
|
---|
| 6489 | {
|
---|
| 6490 | int answer;
|
---|
| 6491 | struct re_search_2_closure closure;
|
---|
| 6492 | closure.string1 = string1;
|
---|
| 6493 | closure.size1 = size1;
|
---|
| 6494 | closure.string2 = string2;
|
---|
| 6495 | closure.size2 = size2;
|
---|
| 6496 | answer = rx_search (rxb, startpos, range, stop, size1 + size2,
|
---|
| 6497 | re_search_2_get_burst,
|
---|
| 6498 | re_search_2_back_check,
|
---|
| 6499 | re_search_2_fetch_char,
|
---|
| 6500 | (void *)&closure,
|
---|
| 6501 | regs,
|
---|
| 6502 | 0,
|
---|
| 6503 | 0);
|
---|
| 6504 | switch (answer)
|
---|
| 6505 | {
|
---|
| 6506 | case rx_search_continuation:
|
---|
| 6507 | abort ();
|
---|
| 6508 | case rx_search_error:
|
---|
| 6509 | return -2;
|
---|
| 6510 | case rx_search_soft_fail:
|
---|
| 6511 | case rx_search_fail:
|
---|
| 6512 | return -1;
|
---|
| 6513 | default:
|
---|
| 6514 | return answer;
|
---|
| 6515 | }
|
---|
| 6516 | }
|
---|
| 6517 |
|
---|
| 6518 | /* Export rx_search to callers outside this file. */
|
---|
| 6519 |
|
---|
| 6520 | int
|
---|
| 6521 | re_rx_search (rxb, startpos, range, stop, total_size,
|
---|
| 6522 | get_burst, back_check, fetch_char,
|
---|
| 6523 | app_closure, regs, resume_state, save_state)
|
---|
| 6524 | struct re_pattern_buffer * rxb;
|
---|
| 6525 | int startpos;
|
---|
| 6526 | int range;
|
---|
| 6527 | int stop;
|
---|
| 6528 | int total_size;
|
---|
| 6529 | rx_get_burst_fn get_burst;
|
---|
| 6530 | rx_back_check_fn back_check;
|
---|
| 6531 | rx_fetch_char_fn fetch_char;
|
---|
| 6532 | void * app_closure;
|
---|
| 6533 | struct re_registers * regs;
|
---|
| 6534 | struct rx_search_state * resume_state;
|
---|
| 6535 | struct rx_search_state * save_state;
|
---|
| 6536 | {
|
---|
| 6537 | return rx_search (rxb, startpos, range, stop, total_size,
|
---|
| 6538 | get_burst, back_check, fetch_char, app_closure,
|
---|
| 6539 | regs, resume_state, save_state);
|
---|
| 6540 | }
|
---|
| 6541 |
|
---|
| 6542 | #if !defined(REGEX_MALLOC) && !defined(__GNUC__)
|
---|
| 6543 | #ifdef __STDC__
|
---|
| 6544 | int
|
---|
| 6545 | re_search_2 (struct re_pattern_buffer *rxb,
|
---|
| 6546 | __const__ char * string1, int size1,
|
---|
| 6547 | __const__ char * string2, int size2,
|
---|
| 6548 | int startpos, int range,
|
---|
| 6549 | struct re_registers *regs,
|
---|
| 6550 | int stop)
|
---|
| 6551 | #else
|
---|
| 6552 | int
|
---|
| 6553 | re_search_2 (rxb, string1, size1, string2, size2, startpos, range, regs, stop)
|
---|
| 6554 | struct re_pattern_buffer *rxb;
|
---|
| 6555 | __const__ char * string1;
|
---|
| 6556 | int size1;
|
---|
| 6557 | __const__ char * string2;
|
---|
| 6558 | int size2;
|
---|
| 6559 | int startpos;
|
---|
| 6560 | int range;
|
---|
| 6561 | struct re_registers *regs;
|
---|
| 6562 | int stop;
|
---|
| 6563 | #endif
|
---|
| 6564 | {
|
---|
| 6565 | int ret;
|
---|
| 6566 | ret = inner_re_search_2 (rxb, string1, size1, string2, size2, startpos,
|
---|
| 6567 | range, regs, stop);
|
---|
| 6568 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 6569 | _alloca (0);
|
---|
| 6570 | #else
|
---|
| 6571 | alloca (0);
|
---|
| 6572 | #endif
|
---|
| 6573 | return ret;
|
---|
| 6574 | }
|
---|
| 6575 | #endif
|
---|
| 6576 |
|
---|
| 6577 |
|
---|
| 6578 | /* Like re_search_2, above, but only one string is specified, and
|
---|
| 6579 | * doesn't let you say where to stop matching.
|
---|
| 6580 | */
|
---|
| 6581 |
|
---|
| 6582 | #ifdef __STDC__
|
---|
| 6583 | int
|
---|
| 6584 | re_search (struct re_pattern_buffer * rxb, __const__ char *string,
|
---|
| 6585 | int size, int startpos, int range,
|
---|
| 6586 | struct re_registers *regs)
|
---|
| 6587 | #else
|
---|
| 6588 | int
|
---|
| 6589 | re_search (rxb, string, size, startpos, range, regs)
|
---|
| 6590 | struct re_pattern_buffer * rxb;
|
---|
| 6591 | __const__ char * string;
|
---|
| 6592 | int size;
|
---|
| 6593 | int startpos;
|
---|
| 6594 | int range;
|
---|
| 6595 | struct re_registers *regs;
|
---|
| 6596 | #endif
|
---|
| 6597 | {
|
---|
| 6598 | return re_search_2 (rxb, 0, 0, string, size, startpos, range, regs, size);
|
---|
| 6599 | }
|
---|
| 6600 |
|
---|
| 6601 | #ifdef __STDC__
|
---|
| 6602 | int
|
---|
| 6603 | re_match_2 (struct re_pattern_buffer * rxb,
|
---|
| 6604 | __const__ char * string1, int size1,
|
---|
| 6605 | __const__ char * string2, int size2,
|
---|
| 6606 | int pos, struct re_registers *regs, int stop)
|
---|
| 6607 | #else
|
---|
| 6608 | int
|
---|
| 6609 | re_match_2 (rxb, string1, size1, string2, size2, pos, regs, stop)
|
---|
| 6610 | struct re_pattern_buffer * rxb;
|
---|
| 6611 | __const__ char * string1;
|
---|
| 6612 | int size1;
|
---|
| 6613 | __const__ char * string2;
|
---|
| 6614 | int size2;
|
---|
| 6615 | int pos;
|
---|
| 6616 | struct re_registers *regs;
|
---|
| 6617 | int stop;
|
---|
| 6618 | #endif
|
---|
| 6619 | {
|
---|
| 6620 | struct re_registers some_regs;
|
---|
| 6621 | regoff_t start;
|
---|
| 6622 | regoff_t end;
|
---|
| 6623 | int srch;
|
---|
| 6624 | int save = rxb->regs_allocated;
|
---|
| 6625 | struct re_registers * regs_to_pass = regs;
|
---|
| 6626 |
|
---|
| 6627 | if (!regs)
|
---|
| 6628 | {
|
---|
| 6629 | some_regs.start = &start;
|
---|
| 6630 | some_regs.end = &end;
|
---|
| 6631 | some_regs.num_regs = 1;
|
---|
| 6632 | regs_to_pass = &some_regs;
|
---|
| 6633 | rxb->regs_allocated = REGS_FIXED;
|
---|
| 6634 | }
|
---|
| 6635 |
|
---|
| 6636 | srch = re_search_2 (rxb, string1, size1, string2, size2,
|
---|
| 6637 | pos, 1, regs_to_pass, stop);
|
---|
| 6638 | if (regs_to_pass != regs)
|
---|
| 6639 | rxb->regs_allocated = save;
|
---|
| 6640 | if (srch < 0)
|
---|
| 6641 | return srch;
|
---|
| 6642 | return regs_to_pass->end[0] - regs_to_pass->start[0];
|
---|
| 6643 | }
|
---|
| 6644 |
|
---|
| 6645 | /* re_match is like re_match_2 except it takes only a single string. */
|
---|
| 6646 |
|
---|
| 6647 | #ifdef __STDC__
|
---|
| 6648 | int
|
---|
| 6649 | re_match (struct re_pattern_buffer * rxb,
|
---|
| 6650 | __const__ char * string,
|
---|
| 6651 | int size, int pos,
|
---|
| 6652 | struct re_registers *regs)
|
---|
| 6653 | #else
|
---|
| 6654 | int
|
---|
| 6655 | re_match (rxb, string, size, pos, regs)
|
---|
| 6656 | struct re_pattern_buffer * rxb;
|
---|
| 6657 | __const__ char *string;
|
---|
| 6658 | int size;
|
---|
| 6659 | int pos;
|
---|
| 6660 | struct re_registers *regs;
|
---|
| 6661 | #endif
|
---|
| 6662 | {
|
---|
| 6663 | return re_match_2 (rxb, string, size, 0, 0, pos, regs, size);
|
---|
| 6664 | }
|
---|
| 6665 |
|
---|
| 6666 |
|
---|
| 6667 | |
---|
| 6668 |
|
---|
| 6669 | /* Set by `re_set_syntax' to the current regexp syntax to recognize. Can
|
---|
| 6670 | also be assigned to arbitrarily: each pattern buffer stores its own
|
---|
| 6671 | syntax, so it can be changed between regex compilations. */
|
---|
| 6672 | reg_syntax_t re_syntax_options = RE_SYNTAX_EMACS;
|
---|
| 6673 |
|
---|
| 6674 |
|
---|
| 6675 | /* Specify the precise syntax of regexps for compilation. This provides
|
---|
| 6676 | for compatibility for various utilities which historically have
|
---|
| 6677 | different, incompatible syntaxes.
|
---|
| 6678 |
|
---|
| 6679 | The argument SYNTAX is a bit mask comprised of the various bits
|
---|
| 6680 | defined in regex.h. We return the old syntax. */
|
---|
| 6681 |
|
---|
| 6682 | #ifdef __STDC__
|
---|
| 6683 | reg_syntax_t
|
---|
| 6684 | re_set_syntax (reg_syntax_t syntax)
|
---|
| 6685 | #else
|
---|
| 6686 | reg_syntax_t
|
---|
| 6687 | re_set_syntax (syntax)
|
---|
| 6688 | reg_syntax_t syntax;
|
---|
| 6689 | #endif
|
---|
| 6690 | {
|
---|
| 6691 | reg_syntax_t ret = re_syntax_options;
|
---|
| 6692 |
|
---|
| 6693 | re_syntax_options = syntax;
|
---|
| 6694 | return ret;
|
---|
| 6695 | }
|
---|
| 6696 | |
---|
| 6697 |
|
---|
| 6698 |
|
---|
| 6699 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
|
---|
| 6700 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use
|
---|
| 6701 | this memory for recording register information. STARTS and ENDS
|
---|
| 6702 | must be allocated using the malloc library routine, and must each
|
---|
| 6703 | be at least NUM_REGS * sizeof (regoff_t) bytes long.
|
---|
| 6704 |
|
---|
| 6705 | If NUM_REGS == 0, then subsequent matches should allocate their own
|
---|
| 6706 | register data.
|
---|
| 6707 |
|
---|
| 6708 | Unless this function is called, the first search or match using
|
---|
| 6709 | PATTERN_BUFFER will allocate its own register data, without
|
---|
| 6710 | freeing the old data. */
|
---|
| 6711 |
|
---|
| 6712 | #ifdef __STDC__
|
---|
| 6713 | void
|
---|
| 6714 | re_set_registers (struct re_pattern_buffer *bufp,
|
---|
| 6715 | struct re_registers *regs,
|
---|
| 6716 | unsigned num_regs,
|
---|
| 6717 | regoff_t * starts, regoff_t * ends)
|
---|
| 6718 | #else
|
---|
| 6719 | void
|
---|
| 6720 | re_set_registers (bufp, regs, num_regs, starts, ends)
|
---|
| 6721 | struct re_pattern_buffer *bufp;
|
---|
| 6722 | struct re_registers *regs;
|
---|
| 6723 | unsigned num_regs;
|
---|
| 6724 | regoff_t * starts;
|
---|
| 6725 | regoff_t * ends;
|
---|
| 6726 | #endif
|
---|
| 6727 | {
|
---|
| 6728 | if (num_regs)
|
---|
| 6729 | {
|
---|
| 6730 | bufp->regs_allocated = REGS_REALLOCATE;
|
---|
| 6731 | regs->num_regs = num_regs;
|
---|
| 6732 | regs->start = starts;
|
---|
| 6733 | regs->end = ends;
|
---|
| 6734 | }
|
---|
| 6735 | else
|
---|
| 6736 | {
|
---|
| 6737 | bufp->regs_allocated = REGS_UNALLOCATED;
|
---|
| 6738 | regs->num_regs = 0;
|
---|
| 6739 | regs->start = regs->end = (regoff_t) 0;
|
---|
| 6740 | }
|
---|
| 6741 | }
|
---|
| 6742 |
|
---|
| 6743 |
|
---|
| 6744 | |
---|
| 6745 |
|
---|
| 6746 |
|
---|
| 6747 | #ifdef __STDC__
|
---|
| 6748 | static int
|
---|
| 6749 | cplx_se_sublist_len (struct rx_se_list * list)
|
---|
| 6750 | #else
|
---|
| 6751 | static int
|
---|
| 6752 | cplx_se_sublist_len (list)
|
---|
| 6753 | struct rx_se_list * list;
|
---|
| 6754 | #endif
|
---|
| 6755 | {
|
---|
| 6756 | int x = 0;
|
---|
| 6757 | while (list)
|
---|
| 6758 | {
|
---|
| 6759 | if ((long)list->car >= 0)
|
---|
| 6760 | ++x;
|
---|
| 6761 | list = list->cdr;
|
---|
| 6762 | }
|
---|
| 6763 | return x;
|
---|
| 6764 | }
|
---|
| 6765 |
|
---|
| 6766 |
|
---|
| 6767 | /* For rx->se_list_cmp */
|
---|
| 6768 |
|
---|
| 6769 | #ifdef __STDC__
|
---|
| 6770 | static int
|
---|
| 6771 | posix_se_list_order (struct rx * rx,
|
---|
| 6772 | struct rx_se_list * a, struct rx_se_list * b)
|
---|
| 6773 | #else
|
---|
| 6774 | static int
|
---|
| 6775 | posix_se_list_order (rx, a, b)
|
---|
| 6776 | struct rx * rx;
|
---|
| 6777 | struct rx_se_list * a;
|
---|
| 6778 | struct rx_se_list * b;
|
---|
| 6779 | #endif
|
---|
| 6780 | {
|
---|
| 6781 | int al = cplx_se_sublist_len (a);
|
---|
| 6782 | int bl = cplx_se_sublist_len (b);
|
---|
| 6783 |
|
---|
| 6784 | if (!al && !bl)
|
---|
| 6785 | return ((a == b)
|
---|
| 6786 | ? 0
|
---|
| 6787 | : ((a < b) ? -1 : 1));
|
---|
| 6788 |
|
---|
| 6789 | else if (!al)
|
---|
| 6790 | return -1;
|
---|
| 6791 |
|
---|
| 6792 | else if (!bl)
|
---|
| 6793 | return 1;
|
---|
| 6794 |
|
---|
| 6795 | else
|
---|
| 6796 | {
|
---|
| 6797 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 6798 | rx_side_effect * av = ((rx_side_effect *)
|
---|
| 6799 | _alloca (sizeof (rx_side_effect) * (al + 1)));
|
---|
| 6800 | rx_side_effect * bv = ((rx_side_effect *)
|
---|
| 6801 | _alloca (sizeof (rx_side_effect) * (bl + 1)));
|
---|
| 6802 | #else
|
---|
| 6803 | rx_side_effect * av = ((rx_side_effect *)
|
---|
| 6804 | alloca (sizeof (rx_side_effect) * (al + 1)));
|
---|
| 6805 | rx_side_effect * bv = ((rx_side_effect *)
|
---|
| 6806 | alloca (sizeof (rx_side_effect) * (bl + 1)));
|
---|
| 6807 | #endif
|
---|
| 6808 | struct rx_se_list * ap = a;
|
---|
| 6809 | struct rx_se_list * bp = b;
|
---|
| 6810 | int ai, bi;
|
---|
| 6811 |
|
---|
| 6812 | for (ai = al - 1; ai >= 0; --ai)
|
---|
| 6813 | {
|
---|
| 6814 | while ((long)ap->car < 0)
|
---|
| 6815 | ap = ap->cdr;
|
---|
| 6816 | av[ai] = ap->car;
|
---|
| 6817 | ap = ap->cdr;
|
---|
| 6818 | }
|
---|
| 6819 | av[al] = (rx_side_effect)-2;
|
---|
| 6820 | for (bi = bl - 1; bi >= 0; --bi)
|
---|
| 6821 | {
|
---|
| 6822 | while ((long)bp->car < 0)
|
---|
| 6823 | bp = bp->cdr;
|
---|
| 6824 | bv[bi] = bp->car;
|
---|
| 6825 | bp = bp->cdr;
|
---|
| 6826 | }
|
---|
| 6827 | bv[bl] = (rx_side_effect)-1;
|
---|
| 6828 |
|
---|
| 6829 | {
|
---|
| 6830 | int ret;
|
---|
| 6831 | int x = 0;
|
---|
| 6832 | while (av[x] == bv[x])
|
---|
| 6833 | ++x;
|
---|
| 6834 | ret = (((unsigned *)(av[x]) < (unsigned *)(bv[x])) ? -1 : 1);
|
---|
| 6835 | return ret;
|
---|
| 6836 | }
|
---|
| 6837 | }
|
---|
| 6838 | }
|
---|
| 6839 |
|
---|
| 6840 |
|
---|
| 6841 |
|
---|
| 6842 | |
---|
| 6843 |
|
---|
| 6844 | /* re_compile_pattern is the GNU regular expression compiler: it
|
---|
| 6845 | compiles PATTERN (of length SIZE) and puts the result in RXB.
|
---|
| 6846 | Returns 0 if the pattern was valid, otherwise an error string.
|
---|
| 6847 |
|
---|
| 6848 | Assumes the `allocated' (and perhaps `buffer') and `translate' fields
|
---|
| 6849 | are set in RXB on entry.
|
---|
| 6850 |
|
---|
| 6851 | We call rx_compile to do the actual compilation. */
|
---|
| 6852 |
|
---|
| 6853 | #ifdef __STDC__
|
---|
| 6854 | __const__ char *
|
---|
| 6855 | re_compile_pattern (__const__ char *pattern,
|
---|
| 6856 | int length,
|
---|
| 6857 | struct re_pattern_buffer * rxb)
|
---|
| 6858 | #else
|
---|
| 6859 | __const__ char *
|
---|
| 6860 | re_compile_pattern (pattern, length, rxb)
|
---|
| 6861 | __const__ char *pattern;
|
---|
| 6862 | int length;
|
---|
| 6863 | struct re_pattern_buffer * rxb;
|
---|
| 6864 | #endif
|
---|
| 6865 | {
|
---|
| 6866 | reg_errcode_t ret;
|
---|
| 6867 |
|
---|
| 6868 | /* GNU code is written to assume at least RE_NREGS registers will be set
|
---|
| 6869 | (and at least one extra will be -1). */
|
---|
| 6870 | rxb->regs_allocated = REGS_UNALLOCATED;
|
---|
| 6871 |
|
---|
| 6872 | /* And GNU code determines whether or not to get register information
|
---|
| 6873 | by passing null for the REGS argument to re_match, etc., not by
|
---|
| 6874 | setting no_sub. */
|
---|
| 6875 | rxb->no_sub = 0;
|
---|
| 6876 |
|
---|
| 6877 | rxb->rx.local_cset_size = 256;
|
---|
| 6878 |
|
---|
| 6879 | /* Match anchors at newline. */
|
---|
| 6880 | rxb->newline_anchor = 1;
|
---|
| 6881 |
|
---|
| 6882 | rxb->re_nsub = 0;
|
---|
| 6883 | rxb->start = 0;
|
---|
| 6884 | rxb->se_params = 0;
|
---|
| 6885 | rxb->rx.nodec = 0;
|
---|
| 6886 | rxb->rx.epsnodec = 0;
|
---|
| 6887 | rxb->rx.instruction_table = 0;
|
---|
| 6888 | rxb->rx.nfa_states = 0;
|
---|
| 6889 | rxb->rx.se_list_cmp = posix_se_list_order;
|
---|
| 6890 | rxb->rx.start_set = 0;
|
---|
| 6891 |
|
---|
| 6892 | ret = rx_compile (pattern, length, re_syntax_options, rxb);
|
---|
| 6893 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 6894 | _alloca (0);
|
---|
| 6895 | #else
|
---|
| 6896 | alloca (0);
|
---|
| 6897 | #endif
|
---|
| 6898 | return rx_error_msg[(int) ret];
|
---|
| 6899 | }
|
---|
| 6900 |
|
---|
| 6901 |
|
---|
| 6902 |
|
---|
| 6903 | #ifdef __STDC__
|
---|
| 6904 | int
|
---|
| 6905 | re_compile_fastmap (struct re_pattern_buffer * rxb)
|
---|
| 6906 | #else
|
---|
| 6907 | int
|
---|
| 6908 | re_compile_fastmap (rxb)
|
---|
| 6909 | struct re_pattern_buffer * rxb;
|
---|
| 6910 | #endif
|
---|
| 6911 | {
|
---|
| 6912 | rx_blow_up_fastmap (rxb);
|
---|
| 6913 | return 0;
|
---|
| 6914 | }
|
---|
| 6915 |
|
---|
| 6916 |
|
---|
| 6917 |
|
---|
| 6918 | |
---|
| 6919 |
|
---|
| 6920 | /* Entry points compatible with 4.2 BSD regex library. We don't define
|
---|
| 6921 | them if this is an Emacs or POSIX compilation. */
|
---|
| 6922 |
|
---|
| 6923 | #if (!defined (emacs) && !defined (_POSIX_SOURCE)) || defined(USE_BSD_REGEX)
|
---|
| 6924 |
|
---|
| 6925 | /* BSD has one and only one pattern buffer. */
|
---|
| 6926 | static struct re_pattern_buffer rx_comp_buf;
|
---|
| 6927 |
|
---|
| 6928 | #ifdef __STDC__
|
---|
| 6929 | char *
|
---|
| 6930 | re_comp (__const__ char *s)
|
---|
| 6931 | #else
|
---|
| 6932 | char *
|
---|
| 6933 | re_comp (s)
|
---|
| 6934 | __const__ char *s;
|
---|
| 6935 | #endif
|
---|
| 6936 | {
|
---|
| 6937 | reg_errcode_t ret;
|
---|
| 6938 |
|
---|
| 6939 | if (!s || (*s == '\0'))
|
---|
| 6940 | {
|
---|
| 6941 | if (!rx_comp_buf.buffer)
|
---|
| 6942 | return "No previous regular expression";
|
---|
| 6943 | return 0;
|
---|
| 6944 | }
|
---|
| 6945 |
|
---|
| 6946 | if (!rx_comp_buf.fastmap)
|
---|
| 6947 | {
|
---|
| 6948 | rx_comp_buf.fastmap = (char *) malloc (1 << CHARBITS);
|
---|
| 6949 | if (!rx_comp_buf.fastmap)
|
---|
| 6950 | return "Memory exhausted";
|
---|
| 6951 | }
|
---|
| 6952 |
|
---|
| 6953 | /* Since `rx_exec' always passes NULL for the `regs' argument, we
|
---|
| 6954 | don't need to initialize the pattern buffer fields which affect it. */
|
---|
| 6955 |
|
---|
| 6956 | /* Match anchors at newlines. */
|
---|
| 6957 | rx_comp_buf.newline_anchor = 1;
|
---|
| 6958 |
|
---|
| 6959 | rx_comp_buf.re_nsub = 0;
|
---|
| 6960 | rx_comp_buf.start = 0;
|
---|
| 6961 | rx_comp_buf.se_params = 0;
|
---|
| 6962 | rx_comp_buf.rx.nodec = 0;
|
---|
| 6963 | rx_comp_buf.rx.epsnodec = 0;
|
---|
| 6964 | rx_comp_buf.rx.instruction_table = 0;
|
---|
| 6965 | rx_comp_buf.rx.nfa_states = 0;
|
---|
| 6966 | rx_comp_buf.rx.start = 0;
|
---|
| 6967 | rx_comp_buf.rx.se_list_cmp = posix_se_list_order;
|
---|
| 6968 | rx_comp_buf.rx.local_cset_size = 256;
|
---|
| 6969 |
|
---|
| 6970 | ret = rx_compile (s, strlen (s), re_syntax_options, &rx_comp_buf);
|
---|
| 6971 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 6972 | _alloca (0);
|
---|
| 6973 | #else
|
---|
| 6974 | alloca (0);
|
---|
| 6975 | #endif
|
---|
| 6976 |
|
---|
| 6977 | /* Yes, we're discarding `__const__' here. */
|
---|
| 6978 | return (char *) rx_error_msg[(int) ret];
|
---|
| 6979 | }
|
---|
| 6980 |
|
---|
| 6981 |
|
---|
| 6982 | #ifdef __STDC__
|
---|
| 6983 | int
|
---|
| 6984 | re_exec (__const__ char *s)
|
---|
| 6985 | #else
|
---|
| 6986 | int
|
---|
| 6987 | re_exec (s)
|
---|
| 6988 | __const__ char *s;
|
---|
| 6989 | #endif
|
---|
| 6990 | {
|
---|
| 6991 | __const__ int len = strlen (s);
|
---|
| 6992 | return
|
---|
| 6993 | 0 <= re_search (&rx_comp_buf, s, len, 0, len, (struct re_registers *) 0);
|
---|
| 6994 | }
|
---|
| 6995 | #endif /* not emacs and not _POSIX_SOURCE */
|
---|
| 6996 |
|
---|
| 6997 | |
---|
| 6998 |
|
---|
| 6999 |
|
---|
| 7000 | /* POSIX.2 functions. Don't define these for Emacs. */
|
---|
| 7001 |
|
---|
| 7002 | #if !defined(emacs)
|
---|
| 7003 |
|
---|
| 7004 | /* regcomp takes a regular expression as a string and compiles it.
|
---|
| 7005 |
|
---|
| 7006 | PREG is a regex_t *. We do not expect any fields to be initialized,
|
---|
| 7007 | since POSIX says we shouldn't. Thus, we set
|
---|
| 7008 |
|
---|
| 7009 | `buffer' to the compiled pattern;
|
---|
| 7010 | `used' to the length of the compiled pattern;
|
---|
| 7011 | `syntax' to RE_SYNTAX_POSIX_EXTENDED if the
|
---|
| 7012 | REG_EXTENDED bit in CFLAGS is set; otherwise, to
|
---|
| 7013 | RE_SYNTAX_POSIX_BASIC;
|
---|
| 7014 | `newline_anchor' to REG_NEWLINE being set in CFLAGS;
|
---|
| 7015 | `fastmap' and `fastmap_accurate' to zero;
|
---|
| 7016 | `re_nsub' to the number of subexpressions in PATTERN.
|
---|
| 7017 |
|
---|
| 7018 | PATTERN is the address of the pattern string.
|
---|
| 7019 |
|
---|
| 7020 | CFLAGS is a series of bits which affect compilation.
|
---|
| 7021 |
|
---|
| 7022 | If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
|
---|
| 7023 | use POSIX basic syntax.
|
---|
| 7024 |
|
---|
| 7025 | If REG_NEWLINE is set, then . and [^...] don't match newline.
|
---|
| 7026 | Also, regexec will try a match beginning after every newline.
|
---|
| 7027 |
|
---|
| 7028 | If REG_ICASE is set, then we considers upper- and lowercase
|
---|
| 7029 | versions of letters to be equivalent when matching.
|
---|
| 7030 |
|
---|
| 7031 | If REG_NOSUB is set, then when PREG is passed to regexec, that
|
---|
| 7032 | routine will report only success or failure, and nothing about the
|
---|
| 7033 | registers.
|
---|
| 7034 |
|
---|
| 7035 | It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for
|
---|
| 7036 | the return codes and their meanings.) */
|
---|
| 7037 |
|
---|
| 7038 |
|
---|
| 7039 | #ifdef __STDC__
|
---|
| 7040 | int
|
---|
| 7041 | regcomp (regex_t * preg, __const__ char * pattern, int cflags)
|
---|
| 7042 | #else
|
---|
| 7043 | int
|
---|
| 7044 | regcomp (preg, pattern, cflags)
|
---|
| 7045 | regex_t * preg;
|
---|
| 7046 | __const__ char * pattern;
|
---|
| 7047 | int cflags;
|
---|
| 7048 | #endif
|
---|
| 7049 | {
|
---|
| 7050 | reg_errcode_t ret;
|
---|
| 7051 | unsigned syntax
|
---|
| 7052 | = cflags & REG_EXTENDED ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
|
---|
| 7053 |
|
---|
| 7054 | /* regex_compile will allocate the space for the compiled pattern. */
|
---|
| 7055 | preg->buffer = 0;
|
---|
| 7056 | preg->allocated = 0;
|
---|
| 7057 | preg->fastmap = malloc (256);
|
---|
| 7058 | if (!preg->fastmap)
|
---|
| 7059 | return REG_ESPACE;
|
---|
| 7060 | preg->fastmap_accurate = 0;
|
---|
| 7061 |
|
---|
| 7062 | if (cflags & REG_ICASE)
|
---|
| 7063 | {
|
---|
| 7064 | unsigned i;
|
---|
| 7065 |
|
---|
| 7066 | preg->translate = (unsigned char *) malloc (256);
|
---|
| 7067 | if (!preg->translate)
|
---|
| 7068 | return (int) REG_ESPACE;
|
---|
| 7069 |
|
---|
| 7070 | /* Map uppercase characters to corresponding lowercase ones. */
|
---|
| 7071 | for (i = 0; i < CHAR_SET_SIZE; i++)
|
---|
| 7072 | preg->translate[i] = isupper (i) ? tolower (i) : i;
|
---|
| 7073 | }
|
---|
| 7074 | else
|
---|
| 7075 | preg->translate = 0;
|
---|
| 7076 |
|
---|
| 7077 | /* If REG_NEWLINE is set, newlines are treated differently. */
|
---|
| 7078 | if (cflags & REG_NEWLINE)
|
---|
| 7079 | { /* REG_NEWLINE implies neither . nor [^...] match newline. */
|
---|
| 7080 | syntax &= ~RE_DOT_NEWLINE;
|
---|
| 7081 | syntax |= RE_HAT_LISTS_NOT_NEWLINE;
|
---|
| 7082 | /* It also changes the matching behavior. */
|
---|
| 7083 | preg->newline_anchor = 1;
|
---|
| 7084 | }
|
---|
| 7085 | else
|
---|
| 7086 | preg->newline_anchor = 0;
|
---|
| 7087 |
|
---|
| 7088 | preg->no_sub = !!(cflags & REG_NOSUB);
|
---|
| 7089 |
|
---|
| 7090 | /* POSIX says a null character in the pattern terminates it, so we
|
---|
| 7091 | can use strlen here in compiling the pattern. */
|
---|
| 7092 | preg->re_nsub = 0;
|
---|
| 7093 | preg->start = 0;
|
---|
| 7094 | preg->se_params = 0;
|
---|
| 7095 | preg->syntax_parens = 0;
|
---|
| 7096 | preg->rx.nodec = 0;
|
---|
| 7097 | preg->rx.epsnodec = 0;
|
---|
| 7098 | preg->rx.instruction_table = 0;
|
---|
| 7099 | preg->rx.nfa_states = 0;
|
---|
| 7100 | preg->rx.local_cset_size = 256;
|
---|
| 7101 | preg->rx.start = 0;
|
---|
| 7102 | preg->rx.se_list_cmp = posix_se_list_order;
|
---|
| 7103 | preg->rx.start_set = 0;
|
---|
| 7104 | ret = rx_compile (pattern, strlen (pattern), syntax, preg);
|
---|
| 7105 |
|
---|
| 7106 | #ifdef __WIN32__ /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 7107 | _alloca (0);
|
---|
| 7108 | #else
|
---|
| 7109 | alloca (0);
|
---|
| 7110 | #endif
|
---|
| 7111 |
|
---|
| 7112 | /* POSIX doesn't distinguish between an unmatched open-group and an
|
---|
| 7113 | unmatched close-group: both are REG_EPAREN. */
|
---|
| 7114 | if (ret == REG_ERPAREN) ret = REG_EPAREN;
|
---|
| 7115 |
|
---|
| 7116 | return (int) ret;
|
---|
| 7117 | }
|
---|
| 7118 |
|
---|
| 7119 |
|
---|
| 7120 | /* regexec searches for a given pattern, specified by PREG, in the
|
---|
| 7121 | string STRING.
|
---|
| 7122 |
|
---|
| 7123 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to
|
---|
| 7124 | `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at
|
---|
| 7125 | least NMATCH elements, and we set them to the offsets of the
|
---|
| 7126 | corresponding matched substrings.
|
---|
| 7127 |
|
---|
| 7128 | EFLAGS specifies `execution flags' which affect matching: if
|
---|
| 7129 | REG_NOTBOL is set, then ^ does not match at the beginning of the
|
---|
| 7130 | string; if REG_NOTEOL is set, then $ does not match at the end.
|
---|
| 7131 |
|
---|
| 7132 | We return 0 if we find a match and REG_NOMATCH if not. */
|
---|
| 7133 |
|
---|
| 7134 | #ifdef __STDC__
|
---|
| 7135 | int
|
---|
| 7136 | regexec (__const__ regex_t *preg, __const__ char *string,
|
---|
| 7137 | size_t nmatch, regmatch_t pmatch[],
|
---|
| 7138 | int eflags)
|
---|
| 7139 | #else
|
---|
| 7140 | int
|
---|
| 7141 | regexec (preg, string, nmatch, pmatch, eflags)
|
---|
| 7142 | __const__ regex_t *preg;
|
---|
| 7143 | __const__ char *string;
|
---|
| 7144 | size_t nmatch;
|
---|
| 7145 | regmatch_t pmatch[];
|
---|
| 7146 | int eflags;
|
---|
| 7147 | #endif
|
---|
| 7148 | {
|
---|
| 7149 | int ret;
|
---|
| 7150 | struct re_registers regs;
|
---|
| 7151 | regex_t private_preg;
|
---|
| 7152 | int len = strlen (string);
|
---|
| 7153 | boolean want_reg_info = !preg->no_sub && nmatch > 0;
|
---|
| 7154 |
|
---|
| 7155 | private_preg = *preg;
|
---|
| 7156 |
|
---|
| 7157 | private_preg.not_bol = !!(eflags & REG_NOTBOL);
|
---|
| 7158 | private_preg.not_eol = !!(eflags & REG_NOTEOL);
|
---|
| 7159 |
|
---|
| 7160 | /* The user has told us exactly how many registers to return
|
---|
| 7161 | * information about, via `nmatch'. We have to pass that on to the
|
---|
| 7162 | * matching routines.
|
---|
| 7163 | */
|
---|
| 7164 | private_preg.regs_allocated = REGS_FIXED;
|
---|
[13656] | 7165 |
|
---|
[3745] | 7166 | if (want_reg_info)
|
---|
| 7167 | {
|
---|
| 7168 | regs.num_regs = nmatch;
|
---|
[13656] | 7169 | regs.start = (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t)));
|
---|
| 7170 | regs.end = (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t)));
|
---|
[3745] | 7171 | if (regs.start == 0 || regs.end == 0)
|
---|
| 7172 | return (int) REG_NOMATCH;
|
---|
| 7173 | }
|
---|
| 7174 |
|
---|
| 7175 | /* Perform the searching operation. */
|
---|
| 7176 | ret = re_search (&private_preg,
|
---|
[13656] | 7177 | string, len,
|
---|
[3745] | 7178 | /* start: */ 0,
|
---|
| 7179 | /* range: */ len,
|
---|
| 7180 | want_reg_info ? ®s : (struct re_registers *) 0);
|
---|
| 7181 |
|
---|
| 7182 | /* Copy the register information to the POSIX structure. */
|
---|
| 7183 | if (want_reg_info)
|
---|
| 7184 | {
|
---|
| 7185 | if (ret >= 0)
|
---|
| 7186 | {
|
---|
| 7187 | unsigned r;
|
---|
| 7188 |
|
---|
| 7189 | for (r = 0; r < nmatch; r++)
|
---|
| 7190 | {
|
---|
| 7191 | pmatch[r].rm_so = regs.start[r];
|
---|
| 7192 | pmatch[r].rm_eo = regs.end[r];
|
---|
| 7193 | }
|
---|
| 7194 | }
|
---|
| 7195 |
|
---|
| 7196 | /* If we needed the temporary register info, free the space now. */
|
---|
| 7197 | free (regs.start);
|
---|
| 7198 | free (regs.end);
|
---|
| 7199 | }
|
---|
| 7200 |
|
---|
| 7201 | /* We want zero return to mean success, unlike `re_search'. */
|
---|
| 7202 | return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH;
|
---|
| 7203 | }
|
---|
| 7204 |
|
---|
| 7205 |
|
---|
| 7206 | /* Returns a message corresponding to an error code, ERRCODE, returned
|
---|
| 7207 | from either regcomp or regexec. */
|
---|
| 7208 |
|
---|
| 7209 | #ifdef __STDC__
|
---|
| 7210 | size_t
|
---|
| 7211 | regerror (int rx_errcode, __const__ regex_t *preg,
|
---|
| 7212 | char *errbuf, size_t errbuf_size)
|
---|
| 7213 | #else
|
---|
| 7214 | size_t
|
---|
| 7215 | regerror (rx_errcode, preg, errbuf, errbuf_size)
|
---|
| 7216 | int rx_errcode;
|
---|
| 7217 | __const__ regex_t *preg;
|
---|
| 7218 | char *errbuf;
|
---|
| 7219 | size_t errbuf_size;
|
---|
| 7220 | #endif
|
---|
| 7221 | {
|
---|
| 7222 | __const__ char *msg
|
---|
| 7223 | = rx_error_msg[rx_errcode] == 0 ? "Success" : rx_error_msg[rx_errcode];
|
---|
| 7224 | size_t msg_size = strlen (msg) + 1; /* Includes the 0. */
|
---|
| 7225 |
|
---|
| 7226 | if (errbuf_size != 0)
|
---|
| 7227 | {
|
---|
| 7228 | if (msg_size > errbuf_size)
|
---|
| 7229 | {
|
---|
| 7230 | strncpy (errbuf, msg, errbuf_size - 1);
|
---|
| 7231 | errbuf[errbuf_size - 1] = 0;
|
---|
| 7232 | }
|
---|
| 7233 | else
|
---|
| 7234 | strcpy (errbuf, msg);
|
---|
| 7235 | }
|
---|
| 7236 |
|
---|
| 7237 | return msg_size;
|
---|
| 7238 | }
|
---|
| 7239 |
|
---|
| 7240 |
|
---|
| 7241 | /* Free dynamically allocated space used by PREG. */
|
---|
| 7242 |
|
---|
| 7243 | #ifdef __STDC__
|
---|
| 7244 | void
|
---|
| 7245 | regfree (regex_t *preg)
|
---|
| 7246 | #else
|
---|
| 7247 | void
|
---|
| 7248 | regfree (preg)
|
---|
| 7249 | regex_t *preg;
|
---|
| 7250 | #endif
|
---|
| 7251 | {
|
---|
| 7252 | if (preg->buffer != 0)
|
---|
| 7253 | free (preg->buffer);
|
---|
| 7254 | preg->buffer = 0;
|
---|
| 7255 | preg->allocated = 0;
|
---|
| 7256 |
|
---|
| 7257 | if (preg->fastmap != 0)
|
---|
| 7258 | free (preg->fastmap);
|
---|
| 7259 | preg->fastmap = 0;
|
---|
| 7260 | preg->fastmap_accurate = 0;
|
---|
| 7261 |
|
---|
| 7262 | if (preg->translate != 0)
|
---|
| 7263 | free (preg->translate);
|
---|
| 7264 | preg->translate = 0;
|
---|
| 7265 | }
|
---|
| 7266 |
|
---|
| 7267 | #endif /* not emacs */
|
---|
| 7268 |
|
---|
| 7269 |
|
---|
| 7270 |
|
---|
| 7271 |
|
---|
| 7272 |
|
---|