PostgreSQL Source Code  git master
regcomp.c
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1 /*
2  * re_*comp and friends - compile REs
3  * This file #includes several others (see the bottom).
4  *
5  * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
6  *
7  * Development of this software was funded, in part, by Cray Research Inc.,
8  * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
9  * Corporation, none of whom are responsible for the results. The author
10  * thanks all of them.
11  *
12  * Redistribution and use in source and binary forms -- with or without
13  * modification -- are permitted for any purpose, provided that
14  * redistributions in source form retain this entire copyright notice and
15  * indicate the origin and nature of any modifications.
16  *
17  * I'd appreciate being given credit for this package in the documentation
18  * of software which uses it, but that is not a requirement.
19  *
20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
22  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
23  * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  *
31  * src/backend/regex/regcomp.c
32  *
33  */
34 
35 #include "regex/regguts.h"
36 
37 /*
38  * forward declarations, up here so forward datatypes etc. are defined early
39  */
40 /* === regcomp.c === */
41 static void moresubs(struct vars *, int);
42 static int freev(struct vars *, int);
43 static void makesearch(struct vars *, struct nfa *);
44 static struct subre *parse(struct vars *, int, int, struct state *, struct state *);
45 static struct subre *parsebranch(struct vars *, int, int, struct state *, struct state *, int);
46 static struct subre *parseqatom(struct vars *, int, int, struct state *, struct state *, struct subre *);
47 static void nonword(struct vars *, int, struct state *, struct state *);
48 static void word(struct vars *, int, struct state *, struct state *);
49 static void charclass(struct vars *, enum char_classes,
50  struct state *, struct state *);
51 static void charclasscomplement(struct vars *, enum char_classes,
52  struct state *, struct state *);
53 static int scannum(struct vars *);
54 static void repeat(struct vars *, struct state *, struct state *, int, int);
55 static void bracket(struct vars *, struct state *, struct state *);
56 static void cbracket(struct vars *, struct state *, struct state *);
57 static void brackpart(struct vars *, struct state *, struct state *, bool *);
58 static const chr *scanplain(struct vars *);
59 static void onechr(struct vars *, chr, struct state *, struct state *);
60 static void optimizebracket(struct vars *, struct state *, struct state *);
61 static void wordchrs(struct vars *);
62 static void processlacon(struct vars *, struct state *, struct state *, int,
63  struct state *, struct state *);
64 static struct subre *subre(struct vars *, int, int, struct state *, struct state *);
65 static void freesubre(struct vars *, struct subre *);
66 static void freesubreandsiblings(struct vars *, struct subre *);
67 static void freesrnode(struct vars *, struct subre *);
68 static void removecaptures(struct vars *, struct subre *);
69 static int numst(struct subre *, int);
70 static void markst(struct subre *);
71 static void cleanst(struct vars *);
72 static long nfatree(struct vars *, struct subre *, FILE *);
73 static long nfanode(struct vars *, struct subre *, int, FILE *);
74 static int newlacon(struct vars *, struct state *, struct state *, int);
75 static void freelacons(struct subre *, int);
76 static void rfree(regex_t *);
77 static int rcancelrequested(void);
78 static int rstacktoodeep(void);
79 
80 #ifdef REG_DEBUG
81 static void dump(regex_t *, FILE *);
82 static void dumpst(struct subre *, FILE *, int);
83 static void stdump(struct subre *, FILE *, int);
84 static const char *stid(struct subre *, char *, size_t);
85 #endif
86 /* === regc_lex.c === */
87 static void lexstart(struct vars *);
88 static void prefixes(struct vars *);
89 static int next(struct vars *);
90 static int lexescape(struct vars *);
91 static chr lexdigits(struct vars *, int, int, int);
92 static int brenext(struct vars *, chr);
93 static void skip(struct vars *);
94 static chr newline(void);
95 static chr chrnamed(struct vars *, const chr *, const chr *, chr);
96 
97 /* === regc_color.c === */
98 static void initcm(struct vars *, struct colormap *);
99 static void freecm(struct colormap *);
100 static color maxcolor(struct colormap *);
101 static color newcolor(struct colormap *);
102 static void freecolor(struct colormap *, color);
103 static color pseudocolor(struct colormap *);
104 static color subcolor(struct colormap *, chr);
105 static color subcolorhi(struct colormap *, color *);
106 static color newsub(struct colormap *, color);
107 static int newhicolorrow(struct colormap *, int);
108 static void newhicolorcols(struct colormap *);
109 static void subcolorcvec(struct vars *, struct cvec *, struct state *, struct state *);
110 static void subcoloronechr(struct vars *, chr, struct state *, struct state *, color *);
111 static void subcoloronerange(struct vars *, chr, chr, struct state *, struct state *, color *);
112 static void subcoloronerow(struct vars *, int, struct state *, struct state *, color *);
113 static void okcolors(struct nfa *, struct colormap *);
114 static void colorchain(struct colormap *, struct arc *);
115 static void uncolorchain(struct colormap *, struct arc *);
116 static void rainbow(struct nfa *, struct colormap *, int, color, struct state *, struct state *);
117 static void colorcomplement(struct nfa *, struct colormap *, int, struct state *, struct state *, struct state *);
118 
119 #ifdef REG_DEBUG
120 static void dumpcolors(struct colormap *, FILE *);
121 static void dumpchr(chr, FILE *);
122 #endif
123 /* === regc_nfa.c === */
124 static struct nfa *newnfa(struct vars *, struct colormap *, struct nfa *);
125 static void freenfa(struct nfa *);
126 static struct state *newstate(struct nfa *);
127 static struct state *newfstate(struct nfa *, int flag);
128 static void dropstate(struct nfa *, struct state *);
129 static void freestate(struct nfa *, struct state *);
130 static void newarc(struct nfa *, int, color, struct state *, struct state *);
131 static void createarc(struct nfa *, int, color, struct state *, struct state *);
132 static struct arc *allocarc(struct nfa *);
133 static void freearc(struct nfa *, struct arc *);
134 static void changearcsource(struct arc *, struct state *);
135 static void changearctarget(struct arc *, struct state *);
136 static int hasnonemptyout(struct state *);
137 static struct arc *findarc(struct state *, int, color);
138 static void cparc(struct nfa *, struct arc *, struct state *, struct state *);
139 static void sortins(struct nfa *, struct state *);
140 static int sortins_cmp(const void *, const void *);
141 static void sortouts(struct nfa *, struct state *);
142 static int sortouts_cmp(const void *, const void *);
143 static void moveins(struct nfa *, struct state *, struct state *);
144 static void copyins(struct nfa *, struct state *, struct state *);
145 static void mergeins(struct nfa *, struct state *, struct arc **, int);
146 static void moveouts(struct nfa *, struct state *, struct state *);
147 static void copyouts(struct nfa *, struct state *, struct state *);
148 static void cloneouts(struct nfa *, struct state *, struct state *, struct state *, int);
149 static void delsub(struct nfa *, struct state *, struct state *);
150 static void deltraverse(struct nfa *, struct state *, struct state *);
151 static void dupnfa(struct nfa *, struct state *, struct state *, struct state *, struct state *);
152 static void duptraverse(struct nfa *, struct state *, struct state *);
153 static void removeconstraints(struct nfa *, struct state *, struct state *);
154 static void removetraverse(struct nfa *, struct state *);
155 static void cleartraverse(struct nfa *, struct state *);
156 static struct state *single_color_transition(struct state *, struct state *);
157 static void specialcolors(struct nfa *);
158 static long optimize(struct nfa *, FILE *);
159 static void pullback(struct nfa *, FILE *);
160 static int pull(struct nfa *, struct arc *, struct state **);
161 static void pushfwd(struct nfa *, FILE *);
162 static int push(struct nfa *, struct arc *, struct state **);
163 
164 #define INCOMPATIBLE 1 /* destroys arc */
165 #define SATISFIED 2 /* constraint satisfied */
166 #define COMPATIBLE 3 /* compatible but not satisfied yet */
167 #define REPLACEARC 4 /* replace arc's color with constraint color */
168 static int combine(struct nfa *nfa, struct arc *con, struct arc *a);
169 static void fixempties(struct nfa *, FILE *);
170 static struct state *emptyreachable(struct nfa *, struct state *,
171  struct state *, struct arc **);
172 static int isconstraintarc(struct arc *);
173 static int hasconstraintout(struct state *);
174 static void fixconstraintloops(struct nfa *, FILE *);
175 static int findconstraintloop(struct nfa *, struct state *);
176 static void breakconstraintloop(struct nfa *, struct state *);
177 static void clonesuccessorstates(struct nfa *, struct state *, struct state *,
178  struct state *, struct arc *,
179  char *, char *, int);
180 static void cleanup(struct nfa *);
181 static void markreachable(struct nfa *, struct state *, struct state *, struct state *);
182 static void markcanreach(struct nfa *, struct state *, struct state *, struct state *);
183 static long analyze(struct nfa *);
184 static void checkmatchall(struct nfa *);
185 static bool checkmatchall_recurse(struct nfa *, struct state *, bool **);
186 static bool check_out_colors_match(struct state *, color, color);
187 static bool check_in_colors_match(struct state *, color, color);
188 static void compact(struct nfa *, struct cnfa *);
189 static void carcsort(struct carc *, size_t);
190 static int carc_cmp(const void *, const void *);
191 static void freecnfa(struct cnfa *);
192 static void dumpnfa(struct nfa *, FILE *);
193 
194 #ifdef REG_DEBUG
195 static void dumpstate(struct state *, FILE *);
196 static void dumparcs(struct state *, FILE *);
197 static void dumparc(struct arc *, struct state *, FILE *);
198 static void dumpcnfa(struct cnfa *, FILE *);
199 static void dumpcstate(int, struct cnfa *, FILE *);
200 #endif
201 /* === regc_cvec.c === */
202 static struct cvec *newcvec(int, int);
203 static struct cvec *clearcvec(struct cvec *);
204 static void addchr(struct cvec *, chr);
205 static void addrange(struct cvec *, chr, chr);
206 static struct cvec *getcvec(struct vars *, int, int);
207 static void freecvec(struct cvec *);
208 
209 /* === regc_pg_locale.c === */
210 static int pg_wc_isdigit(pg_wchar c);
211 static int pg_wc_isalpha(pg_wchar c);
212 static int pg_wc_isalnum(pg_wchar c);
213 static int pg_wc_isword(pg_wchar c);
214 static int pg_wc_isupper(pg_wchar c);
215 static int pg_wc_islower(pg_wchar c);
216 static int pg_wc_isgraph(pg_wchar c);
217 static int pg_wc_isprint(pg_wchar c);
218 static int pg_wc_ispunct(pg_wchar c);
219 static int pg_wc_isspace(pg_wchar c);
220 static pg_wchar pg_wc_toupper(pg_wchar c);
221 static pg_wchar pg_wc_tolower(pg_wchar c);
222 
223 /* === regc_locale.c === */
224 static chr element(struct vars *, const chr *, const chr *);
225 static struct cvec *range(struct vars *, chr, chr, int);
226 static int before(chr, chr);
227 static struct cvec *eclass(struct vars *, chr, int);
228 static enum char_classes lookupcclass(struct vars *, const chr *, const chr *);
229 static struct cvec *cclasscvec(struct vars *, enum char_classes, int);
230 static int cclass_column_index(struct colormap *, chr);
231 static struct cvec *allcases(struct vars *, chr);
232 static int cmp(const chr *, const chr *, size_t);
233 static int casecmp(const chr *, const chr *, size_t);
234 
235 
236 /* internal variables, bundled for easy passing around */
237 struct vars
238 {
239  regex_t *re;
240  const chr *now; /* scan pointer into string */
241  const chr *stop; /* end of string */
242  int err; /* error code (0 if none) */
243  int cflags; /* copy of compile flags */
244  int lasttype; /* type of previous token */
245  int nexttype; /* type of next token */
246  chr nextvalue; /* value (if any) of next token */
247  int lexcon; /* lexical context type (see regc_lex.c) */
248  int nsubexp; /* subexpression count */
249  struct subre **subs; /* subRE pointer vector */
250  size_t nsubs; /* length of vector */
251  struct subre *sub10[10]; /* initial vector, enough for most */
252  struct nfa *nfa; /* the NFA */
253  struct colormap *cm; /* character color map */
254  color nlcolor; /* color of newline */
255  struct state *wordchrs; /* state in nfa holding word-char outarcs */
256  struct subre *tree; /* subexpression tree */
257  struct subre *treechain; /* all tree nodes allocated */
258  struct subre *treefree; /* any free tree nodes */
259  int ntree; /* number of tree nodes, plus one */
260  struct cvec *cv; /* interface cvec */
261  struct cvec *cv2; /* utility cvec */
262  struct subre *lacons; /* lookaround-constraint vector */
263  int nlacons; /* size of lacons[]; note that only slots
264  * numbered 1 .. nlacons-1 are used */
265  size_t spaceused; /* approx. space used for compilation */
266 };
267 
268 /* parsing macros; most know that `v' is the struct vars pointer */
269 #define NEXT() (next(v)) /* advance by one token */
270 #define SEE(t) (v->nexttype == (t)) /* is next token this? */
271 #define EAT(t) (SEE(t) && next(v)) /* if next is this, swallow it */
272 #define VISERR(vv) ((vv)->err != 0) /* have we seen an error yet? */
273 #define ISERR() VISERR(v)
274 #define VERR(vv,e) ((vv)->nexttype = EOS, \
275  (vv)->err = ((vv)->err ? (vv)->err : (e)))
276 #define ERR(e) VERR(v, e) /* record an error */
277 #define NOERR() {if (ISERR()) return;} /* if error seen, return */
278 #define NOERRN() {if (ISERR()) return NULL;} /* NOERR with retval */
279 #define NOERRZ() {if (ISERR()) return 0;} /* NOERR with retval */
280 #define INSIST(c, e) do { if (!(c)) ERR(e); } while (0) /* error if c false */
281 #define NOTE(b) (v->re->re_info |= (b)) /* note visible condition */
282 #define EMPTYARC(x, y) newarc(v->nfa, EMPTY, 0, x, y)
283 
284 /* token type codes, some also used as NFA arc types */
285 #define EMPTY 'n' /* no token present */
286 #define EOS 'e' /* end of string */
287 #define PLAIN 'p' /* ordinary character */
288 #define DIGIT 'd' /* digit (in bound) */
289 #define BACKREF 'b' /* back reference */
290 #define COLLEL 'I' /* start of [. */
291 #define ECLASS 'E' /* start of [= */
292 #define CCLASS 'C' /* start of [: */
293 #define END 'X' /* end of [. [= [: */
294 #define CCLASSS 's' /* char class shorthand escape */
295 #define CCLASSC 'c' /* complement char class shorthand escape */
296 #define RANGE 'R' /* - within [] which might be range delim. */
297 #define LACON 'L' /* lookaround constraint subRE */
298 #define AHEAD 'a' /* color-lookahead arc */
299 #define BEHIND 'r' /* color-lookbehind arc */
300 #define WBDRY 'w' /* word boundary constraint */
301 #define NWBDRY 'W' /* non-word-boundary constraint */
302 #define SBEGIN 'A' /* beginning of string (even if not BOL) */
303 #define SEND 'Z' /* end of string (even if not EOL) */
304 
305 /* is an arc colored, and hence should belong to a color chain? */
306 /* the test on "co" eliminates RAINBOW arcs, which we don't bother to chain */
307 #define COLORED(a) \
308  ((a)->co >= 0 && \
309  ((a)->type == PLAIN || (a)->type == AHEAD || (a)->type == BEHIND))
310 
311 
312 /* static function list */
313 static const struct fns functions = {
314  rfree, /* regfree insides */
315  rcancelrequested, /* check for cancel request */
316  rstacktoodeep /* check for stack getting dangerously deep */
317 };
318 
319 
320 
321 /*
322  * pg_regcomp - compile regular expression
323  *
324  * Note: on failure, no resources remain allocated, so pg_regfree()
325  * need not be applied to re.
326  */
327 int
328 pg_regcomp(regex_t *re,
329  const chr *string,
330  size_t len,
331  int flags,
332  Oid collation)
333 {
334  struct vars var;
335  struct vars *v = &var;
336  struct guts *g;
337  int i;
338  size_t j;
339 
340 #ifdef REG_DEBUG
341  FILE *debug = (flags & REG_PROGRESS) ? stdout : (FILE *) NULL;
342 #else
343  FILE *debug = (FILE *) NULL;
344 #endif
345 
346 #define CNOERR() { if (ISERR()) return freev(v, v->err); }
347 
348  /* sanity checks */
349 
350  if (re == NULL || string == NULL)
351  return REG_INVARG;
352  if ((flags & REG_QUOTE) &&
353  (flags & (REG_ADVANCED | REG_EXPANDED | REG_NEWLINE)))
354  return REG_INVARG;
355  if (!(flags & REG_EXTENDED) && (flags & REG_ADVF))
356  return REG_INVARG;
357 
358  /* Initialize locale-dependent support */
359  pg_set_regex_collation(collation);
360 
361  /* initial setup (after which freev() is callable) */
362  v->re = re;
363  v->now = string;
364  v->stop = v->now + len;
365  v->err = 0;
366  v->cflags = flags;
367  v->nsubexp = 0;
368  v->subs = v->sub10;
369  v->nsubs = 10;
370  for (j = 0; j < v->nsubs; j++)
371  v->subs[j] = NULL;
372  v->nfa = NULL;
373  v->cm = NULL;
374  v->nlcolor = COLORLESS;
375  v->wordchrs = NULL;
376  v->tree = NULL;
377  v->treechain = NULL;
378  v->treefree = NULL;
379  v->cv = NULL;
380  v->cv2 = NULL;
381  v->lacons = NULL;
382  v->nlacons = 0;
383  v->spaceused = 0;
384  re->re_magic = REMAGIC;
385  re->re_info = 0; /* bits get set during parse */
386  re->re_csize = sizeof(chr);
387  re->re_collation = collation;
388  re->re_guts = NULL;
389  re->re_fns = VS(&functions);
390 
391  /* more complex setup, malloced things */
392  re->re_guts = VS(MALLOC(sizeof(struct guts)));
393  if (re->re_guts == NULL)
394  return freev(v, REG_ESPACE);
395  g = (struct guts *) re->re_guts;
396  g->tree = NULL;
397  initcm(v, &g->cmap);
398  v->cm = &g->cmap;
399  g->lacons = NULL;
400  g->nlacons = 0;
401  ZAPCNFA(g->search);
402  v->nfa = newnfa(v, v->cm, (struct nfa *) NULL);
403  CNOERR();
404  /* set up a reasonably-sized transient cvec for getcvec usage */
405  v->cv = newcvec(100, 20);
406  if (v->cv == NULL)
407  return freev(v, REG_ESPACE);
408 
409  /* parsing */
410  lexstart(v); /* also handles prefixes */
411  if ((v->cflags & REG_NLSTOP) || (v->cflags & REG_NLANCH))
412  {
413  /* assign newline a unique color */
414  v->nlcolor = subcolor(v->cm, newline());
415  okcolors(v->nfa, v->cm);
416  }
417  CNOERR();
418  v->tree = parse(v, EOS, PLAIN, v->nfa->init, v->nfa->final);
419  assert(SEE(EOS)); /* even if error; ISERR() => SEE(EOS) */
420  CNOERR();
421  assert(v->tree != NULL);
422 
423  /* finish setup of nfa and its subre tree */
424  specialcolors(v->nfa);
425  CNOERR();
426 #ifdef REG_DEBUG
427  if (debug != NULL)
428  {
429  fprintf(debug, "\n\n\n========= RAW ==========\n");
430  dumpnfa(v->nfa, debug);
431  dumpst(v->tree, debug, 1);
432  }
433 #endif
434  if (v->cflags & REG_NOSUB)
435  removecaptures(v, v->tree);
436  v->ntree = numst(v->tree, 1);
437  markst(v->tree);
438  cleanst(v);
439 #ifdef REG_DEBUG
440  if (debug != NULL)
441  {
442  fprintf(debug, "\n\n\n========= TREE FIXED ==========\n");
443  dumpst(v->tree, debug, 1);
444  }
445 #endif
446 
447  /* build compacted NFAs for tree and lacons */
448  re->re_info |= nfatree(v, v->tree, debug);
449  CNOERR();
450  assert(v->nlacons == 0 || v->lacons != NULL);
451  for (i = 1; i < v->nlacons; i++)
452  {
453  struct subre *lasub = &v->lacons[i];
454 
455 #ifdef REG_DEBUG
456  if (debug != NULL)
457  fprintf(debug, "\n\n\n========= LA%d ==========\n", i);
458 #endif
459 
460  /* Prepend .* to pattern if it's a lookbehind LACON */
461  nfanode(v, lasub, !LATYPE_IS_AHEAD(lasub->latype), debug);
462  }
463  CNOERR();
464  if (v->tree->flags & SHORTER)
465  NOTE(REG_USHORTEST);
466 
467  /* build compacted NFAs for tree, lacons, fast search */
468 #ifdef REG_DEBUG
469  if (debug != NULL)
470  fprintf(debug, "\n\n\n========= SEARCH ==========\n");
471 #endif
472  /* can sacrifice main NFA now, so use it as work area */
473  (DISCARD) optimize(v->nfa, debug);
474  CNOERR();
475  makesearch(v, v->nfa);
476  CNOERR();
477  compact(v->nfa, &g->search);
478  CNOERR();
479 
480  /* looks okay, package it up */
481  re->re_nsub = v->nsubexp;
482  v->re = NULL; /* freev no longer frees re */
483  g->magic = GUTSMAGIC;
484  g->cflags = v->cflags;
485  g->info = re->re_info;
486  g->nsub = re->re_nsub;
487  g->tree = v->tree;
488  v->tree = NULL;
489  g->ntree = v->ntree;
490  g->compare = (v->cflags & REG_ICASE) ? casecmp : cmp;
491  g->lacons = v->lacons;
492  v->lacons = NULL;
493  g->nlacons = v->nlacons;
494 
495 #ifdef REG_DEBUG
496  if (flags & REG_DUMP)
497  {
498  dump(re, stdout);
499  fflush(stdout);
500  }
501 #endif
502 
503  assert(v->err == 0);
504  return freev(v, 0);
505 }
506 
507 /*
508  * moresubs - enlarge subRE vector
509  */
510 static void
511 moresubs(struct vars *v,
512  int wanted) /* want enough room for this one */
513 {
514  struct subre **p;
515  size_t n;
516 
517  assert(wanted > 0 && (size_t) wanted >= v->nsubs);
518  n = (size_t) wanted * 3 / 2 + 1;
519 
520  if (v->subs == v->sub10)
521  {
522  p = (struct subre **) MALLOC(n * sizeof(struct subre *));
523  if (p != NULL)
524  memcpy(VS(p), VS(v->subs),
525  v->nsubs * sizeof(struct subre *));
526  }
527  else
528  p = (struct subre **) REALLOC(v->subs, n * sizeof(struct subre *));
529  if (p == NULL)
530  {
531  ERR(REG_ESPACE);
532  return;
533  }
534  v->subs = p;
535  for (p = &v->subs[v->nsubs]; v->nsubs < n; p++, v->nsubs++)
536  *p = NULL;
537  assert(v->nsubs == n);
538  assert((size_t) wanted < v->nsubs);
539 }
540 
541 /*
542  * freev - free vars struct's substructures where necessary
543  *
544  * Optionally does error-number setting, and always returns error code
545  * (if any), to make error-handling code terser.
546  */
547 static int
548 freev(struct vars *v,
549  int err)
550 {
551  if (v->re != NULL)
552  rfree(v->re);
553  if (v->subs != v->sub10)
554  FREE(v->subs);
555  if (v->nfa != NULL)
556  freenfa(v->nfa);
557  if (v->tree != NULL)
558  freesubre(v, v->tree);
559  if (v->treechain != NULL)
560  cleanst(v);
561  if (v->cv != NULL)
562  freecvec(v->cv);
563  if (v->cv2 != NULL)
564  freecvec(v->cv2);
565  if (v->lacons != NULL)
566  freelacons(v->lacons, v->nlacons);
567  ERR(err); /* nop if err==0 */
568 
569  return v->err;
570 }
571 
572 /*
573  * makesearch - turn an NFA into a search NFA (implicit prepend of .*?)
574  * NFA must have been optimize()d already.
575  */
576 static void
577 makesearch(struct vars *v,
578  struct nfa *nfa)
579 {
580  struct arc *a;
581  struct arc *b;
582  struct state *pre = nfa->pre;
583  struct state *s;
584  struct state *s2;
585  struct state *slist;
586 
587  /* no loops are needed if it's anchored */
588  for (a = pre->outs; a != NULL; a = a->outchain)
589  {
590  assert(a->type == PLAIN);
591  if (a->co != nfa->bos[0] && a->co != nfa->bos[1])
592  break;
593  }
594  if (a != NULL)
595  {
596  /* add implicit .* in front */
597  rainbow(nfa, v->cm, PLAIN, COLORLESS, pre, pre);
598 
599  /* and ^* and \A* too -- not always necessary, but harmless */
600  newarc(nfa, PLAIN, nfa->bos[0], pre, pre);
601  newarc(nfa, PLAIN, nfa->bos[1], pre, pre);
602 
603  /*
604  * The pattern is still MATCHALL if it was before, but the max match
605  * length is now infinity.
606  */
607  if (nfa->flags & MATCHALL)
608  nfa->maxmatchall = DUPINF;
609  }
610 
611  /*
612  * Now here's the subtle part. Because many REs have no lookback
613  * constraints, often knowing when you were in the pre state tells you
614  * little; it's the next state(s) that are informative. But some of them
615  * may have other inarcs, i.e. it may be possible to make actual progress
616  * and then return to one of them. We must de-optimize such cases,
617  * splitting each such state into progress and no-progress states.
618  */
619 
620  /* first, make a list of the states reachable from pre and elsewhere */
621  slist = NULL;
622  for (a = pre->outs; a != NULL; a = a->outchain)
623  {
624  s = a->to;
625  for (b = s->ins; b != NULL; b = b->inchain)
626  {
627  if (b->from != pre)
628  break;
629  }
630 
631  /*
632  * We want to mark states as being in the list already by having non
633  * NULL tmp fields, but we can't just store the old slist value in tmp
634  * because that doesn't work for the first such state. Instead, the
635  * first list entry gets its own address in tmp.
636  */
637  if (b != NULL && s->tmp == NULL)
638  {
639  s->tmp = (slist != NULL) ? slist : s;
640  slist = s;
641  }
642  }
643 
644  /* do the splits */
645  for (s = slist; s != NULL; s = s2)
646  {
647  s2 = newstate(nfa);
648  NOERR();
649  copyouts(nfa, s, s2);
650  NOERR();
651  for (a = s->ins; a != NULL; a = b)
652  {
653  b = a->inchain;
654  if (a->from != pre)
655  {
656  cparc(nfa, a, a->from, s2);
657  freearc(nfa, a);
658  }
659  }
660  s2 = (s->tmp != s) ? s->tmp : NULL;
661  s->tmp = NULL; /* clean up while we're at it */
662  }
663 }
664 
665 /*
666  * parse - parse an RE
667  *
668  * This is actually just the top level, which parses a bunch of branches
669  * tied together with '|'. If there's more than one, they appear in the
670  * tree as the children of a '|' subre.
671  */
672 static struct subre *
673 parse(struct vars *v,
674  int stopper, /* EOS or ')' */
675  int type, /* LACON (lookaround subRE) or PLAIN */
676  struct state *init, /* initial state */
677  struct state *final) /* final state */
678 {
679  struct subre *branches; /* top level */
680  struct subre *lastbranch; /* latest branch */
681 
682  assert(stopper == ')' || stopper == EOS);
683 
684  branches = subre(v, '|', LONGER, init, final);
685  NOERRN();
686  lastbranch = NULL;
687  do
688  { /* a branch */
689  struct subre *branch;
690  struct state *left; /* scaffolding for branch */
691  struct state *right;
692 
693  left = newstate(v->nfa);
694  right = newstate(v->nfa);
695  NOERRN();
696  EMPTYARC(init, left);
697  EMPTYARC(right, final);
698  NOERRN();
699  branch = parsebranch(v, stopper, type, left, right, 0);
700  NOERRN();
701  if (lastbranch)
702  lastbranch->sibling = branch;
703  else
704  branches->child = branch;
705  branches->flags |= UP(branches->flags | branch->flags);
706  lastbranch = branch;
707  } while (EAT('|'));
708  assert(SEE(stopper) || SEE(EOS));
709 
710  if (!SEE(stopper))
711  {
712  assert(stopper == ')' && SEE(EOS));
713  ERR(REG_EPAREN);
714  }
715 
716  /* optimize out simple cases */
717  if (lastbranch == branches->child)
718  { /* only one branch */
719  assert(lastbranch->sibling == NULL);
720  freesrnode(v, branches);
721  branches = lastbranch;
722  }
723  else if (!MESSY(branches->flags))
724  { /* no interesting innards */
725  freesubreandsiblings(v, branches->child);
726  branches->child = NULL;
727  branches->op = '=';
728  }
729 
730  return branches;
731 }
732 
733 /*
734  * parsebranch - parse one branch of an RE
735  *
736  * This mostly manages concatenation, working closely with parseqatom().
737  * Concatenated things are bundled up as much as possible, with separate
738  * '.' nodes introduced only when necessary due to substructure.
739  */
740 static struct subre *
741 parsebranch(struct vars *v,
742  int stopper, /* EOS or ')' */
743  int type, /* LACON (lookaround subRE) or PLAIN */
744  struct state *left, /* leftmost state */
745  struct state *right, /* rightmost state */
746  int partial) /* is this only part of a branch? */
747 {
748  struct state *lp; /* left end of current construct */
749  int seencontent; /* is there anything in this branch yet? */
750  struct subre *t;
751 
752  lp = left;
753  seencontent = 0;
754  t = subre(v, '=', 0, left, right); /* op '=' is tentative */
755  NOERRN();
756  while (!SEE('|') && !SEE(stopper) && !SEE(EOS))
757  {
758  if (seencontent)
759  { /* implicit concat operator */
760  lp = newstate(v->nfa);
761  NOERRN();
762  moveins(v->nfa, right, lp);
763  }
764  seencontent = 1;
765 
766  /* NB, recursion in parseqatom() may swallow rest of branch */
767  t = parseqatom(v, stopper, type, lp, right, t);
768  NOERRN();
769  }
770 
771  if (!seencontent)
772  { /* empty branch */
773  if (!partial)
774  NOTE(REG_UUNSPEC);
775  assert(lp == left);
776  EMPTYARC(left, right);
777  }
778 
779  return t;
780 }
781 
782 /*
783  * parseqatom - parse one quantified atom or constraint of an RE
784  *
785  * The bookkeeping near the end cooperates very closely with parsebranch();
786  * in particular, it contains a recursion that can involve parsing the rest
787  * of the branch, making this function's name somewhat inaccurate.
788  *
789  * Usually, the return value is just "top", but in some cases where we
790  * have parsed the rest of the branch, we may deem "top" redundant and
791  * free it, returning some child subre instead.
792  */
793 static struct subre *
794 parseqatom(struct vars *v,
795  int stopper, /* EOS or ')' */
796  int type, /* LACON (lookaround subRE) or PLAIN */
797  struct state *lp, /* left state to hang it on */
798  struct state *rp, /* right state to hang it on */
799  struct subre *top) /* subtree top */
800 {
801  struct state *s; /* temporaries for new states */
802  struct state *s2;
803 
804 #define ARCV(t, val) newarc(v->nfa, t, val, lp, rp)
805  int m,
806  n;
807  struct subre *atom; /* atom's subtree */
808  struct subre *t;
809  int cap; /* capturing parens? */
810  int latype; /* lookaround constraint type */
811  int subno; /* capturing-parens or backref number */
812  int atomtype;
813  int qprefer; /* quantifier short/long preference */
814  int f;
815  struct subre **atomp; /* where the pointer to atom is */
816 
817  /* initial bookkeeping */
818  atom = NULL;
819  assert(lp->nouts == 0); /* must string new code */
820  assert(rp->nins == 0); /* between lp and rp */
821  subno = 0; /* just to shut lint up */
822 
823  /* an atom or constraint... */
824  atomtype = v->nexttype;
825  switch (atomtype)
826  {
827  /* first, constraints, which end by returning */
828  case '^':
829  ARCV('^', 1);
830  if (v->cflags & REG_NLANCH)
831  ARCV(BEHIND, v->nlcolor);
832  NEXT();
833  return top;
834  break;
835  case '$':
836  ARCV('$', 1);
837  if (v->cflags & REG_NLANCH)
838  ARCV(AHEAD, v->nlcolor);
839  NEXT();
840  return top;
841  break;
842  case SBEGIN:
843  ARCV('^', 1); /* BOL */
844  ARCV('^', 0); /* or BOS */
845  NEXT();
846  return top;
847  break;
848  case SEND:
849  ARCV('$', 1); /* EOL */
850  ARCV('$', 0); /* or EOS */
851  NEXT();
852  return top;
853  break;
854  case '<':
855  wordchrs(v);
856  s = newstate(v->nfa);
857  NOERRN();
858  nonword(v, BEHIND, lp, s);
859  word(v, AHEAD, s, rp);
860  NEXT();
861  return top;
862  break;
863  case '>':
864  wordchrs(v);
865  s = newstate(v->nfa);
866  NOERRN();
867  word(v, BEHIND, lp, s);
868  nonword(v, AHEAD, s, rp);
869  NEXT();
870  return top;
871  break;
872  case WBDRY:
873  wordchrs(v);
874  s = newstate(v->nfa);
875  NOERRN();
876  nonword(v, BEHIND, lp, s);
877  word(v, AHEAD, s, rp);
878  s = newstate(v->nfa);
879  NOERRN();
880  word(v, BEHIND, lp, s);
881  nonword(v, AHEAD, s, rp);
882  NEXT();
883  return top;
884  break;
885  case NWBDRY:
886  wordchrs(v);
887  s = newstate(v->nfa);
888  NOERRN();
889  word(v, BEHIND, lp, s);
890  word(v, AHEAD, s, rp);
891  s = newstate(v->nfa);
892  NOERRN();
893  nonword(v, BEHIND, lp, s);
894  nonword(v, AHEAD, s, rp);
895  NEXT();
896  return top;
897  break;
898  case LACON: /* lookaround constraint */
899  latype = v->nextvalue;
900  NEXT();
901  s = newstate(v->nfa);
902  s2 = newstate(v->nfa);
903  NOERRN();
904  t = parse(v, ')', LACON, s, s2);
905  freesubre(v, t); /* internal structure irrelevant */
906  NOERRN();
907  assert(SEE(')'));
908  NEXT();
909  processlacon(v, s, s2, latype, lp, rp);
910  return top;
911  break;
912  /* then errors, to get them out of the way */
913  case '*':
914  case '+':
915  case '?':
916  case '{':
917  ERR(REG_BADRPT);
918  return top;
919  break;
920  default:
921  ERR(REG_ASSERT);
922  return top;
923  break;
924  /* then plain characters, and minor variants on that theme */
925  case ')': /* unbalanced paren */
926  if ((v->cflags & REG_ADVANCED) != REG_EXTENDED)
927  {
928  ERR(REG_EPAREN);
929  return top;
930  }
931  /* legal in EREs due to specification botch */
932  NOTE(REG_UPBOTCH);
933  /* fall through into case PLAIN */
934  /* FALLTHROUGH */
935  case PLAIN:
936  onechr(v, v->nextvalue, lp, rp);
937  okcolors(v->nfa, v->cm);
938  NOERRN();
939  NEXT();
940  break;
941  case '[':
942  if (v->nextvalue == 1)
943  bracket(v, lp, rp);
944  else
945  cbracket(v, lp, rp);
946  assert(SEE(']') || ISERR());
947  NEXT();
948  break;
949  case CCLASSS:
950  charclass(v, (enum char_classes) v->nextvalue, lp, rp);
951  okcolors(v->nfa, v->cm);
952  NEXT();
953  break;
954  case CCLASSC:
955  charclasscomplement(v, (enum char_classes) v->nextvalue, lp, rp);
956  /* charclasscomplement() did okcolors() internally */
957  NEXT();
958  break;
959  case '.':
960  rainbow(v->nfa, v->cm, PLAIN,
961  (v->cflags & REG_NLSTOP) ? v->nlcolor : COLORLESS,
962  lp, rp);
963  NEXT();
964  break;
965  /* and finally the ugly stuff */
966  case '(': /* value flags as capturing or non */
967  cap = (type == LACON) ? 0 : v->nextvalue;
968  if (cap)
969  {
970  v->nsubexp++;
971  subno = v->nsubexp;
972  if ((size_t) subno >= v->nsubs)
973  moresubs(v, subno);
974  }
975  else
976  atomtype = PLAIN; /* something that's not '(' */
977  NEXT();
978 
979  /*
980  * Make separate endpoint states to keep this sub-NFA distinct
981  * from what surrounds it. We need to be sure that when we
982  * duplicate the sub-NFA for a backref, we get the right
983  * states/arcs and no others. In particular, letting a backref
984  * duplicate the sub-NFA from lp to rp would be quite wrong,
985  * because we may add quantification superstructure around this
986  * atom below. (Perhaps we could skip the extra states for
987  * non-capturing parens, but it seems not worth the trouble.)
988  */
989  s = newstate(v->nfa);
990  s2 = newstate(v->nfa);
991  NOERRN();
992  /* We may not need these arcs, but keep things connected for now */
993  EMPTYARC(lp, s);
994  EMPTYARC(s2, rp);
995  NOERRN();
996  atom = parse(v, ')', type, s, s2);
997  assert(SEE(')') || ISERR());
998  NEXT();
999  NOERRN();
1000  if (cap)
1001  {
1002  if (atom->capno == 0)
1003  {
1004  /* normal case: just mark the atom as capturing */
1005  atom->flags |= CAP;
1006  atom->capno = subno;
1007  }
1008  else
1009  {
1010  /* generate no-op wrapper node to handle "((x))" */
1011  t = subre(v, '(', atom->flags | CAP, s, s2);
1012  NOERRN();
1013  t->capno = subno;
1014  t->child = atom;
1015  atom = t;
1016  }
1017  assert(v->subs[subno] == NULL);
1018  v->subs[subno] = atom;
1019  }
1020  /* postpone everything else pending possible {0} */
1021  break;
1022  case BACKREF: /* the Feature From The Black Lagoon */
1023  INSIST(type != LACON, REG_ESUBREG);
1024  subno = v->nextvalue;
1025  assert(subno > 0);
1026  INSIST(subno < v->nsubs, REG_ESUBREG);
1027  NOERRN();
1028  INSIST(v->subs[subno] != NULL, REG_ESUBREG);
1029  NOERRN();
1030  atom = subre(v, 'b', BACKR, lp, rp);
1031  NOERRN();
1032  atom->backno = subno;
1033  v->subs[subno]->flags |= BRUSE;
1034  EMPTYARC(lp, rp); /* temporarily, so there's something */
1035  NEXT();
1036  break;
1037  }
1038 
1039  /* ...and an atom may be followed by a quantifier */
1040  switch (v->nexttype)
1041  {
1042  case '*':
1043  m = 0;
1044  n = DUPINF;
1045  qprefer = (v->nextvalue) ? LONGER : SHORTER;
1046  NEXT();
1047  break;
1048  case '+':
1049  m = 1;
1050  n = DUPINF;
1051  qprefer = (v->nextvalue) ? LONGER : SHORTER;
1052  NEXT();
1053  break;
1054  case '?':
1055  m = 0;
1056  n = 1;
1057  qprefer = (v->nextvalue) ? LONGER : SHORTER;
1058  NEXT();
1059  break;
1060  case '{':
1061  NEXT();
1062  m = scannum(v);
1063  if (EAT(','))
1064  {
1065  if (SEE(DIGIT))
1066  n = scannum(v);
1067  else
1068  n = DUPINF;
1069  if (m > n)
1070  {
1071  ERR(REG_BADBR);
1072  return top;
1073  }
1074  /* {m,n} exercises preference, even if it's {m,m} */
1075  qprefer = (v->nextvalue) ? LONGER : SHORTER;
1076  }
1077  else
1078  {
1079  n = m;
1080  /* {m} passes operand's preference through */
1081  qprefer = 0;
1082  }
1083  if (!SEE('}'))
1084  { /* catches errors too */
1085  ERR(REG_BADBR);
1086  return top;
1087  }
1088  NEXT();
1089  break;
1090  default: /* no quantifier */
1091  m = n = 1;
1092  qprefer = 0;
1093  break;
1094  }
1095 
1096  /* annoying special case: {0} or {0,0} cancels everything */
1097  if (m == 0 && n == 0)
1098  {
1099  /*
1100  * If we had capturing subexpression(s) within the atom, we don't want
1101  * to destroy them, because it's legal (if useless) to back-ref them
1102  * later. Hence, just unlink the atom from lp/rp and then ignore it.
1103  */
1104  if (atom != NULL && (atom->flags & CAP))
1105  {
1106  delsub(v->nfa, lp, atom->begin);
1107  delsub(v->nfa, atom->end, rp);
1108  }
1109  else
1110  {
1111  /* Otherwise, we can clean up any subre infrastructure we made */
1112  if (atom != NULL)
1113  freesubre(v, atom);
1114  delsub(v->nfa, lp, rp);
1115  }
1116  EMPTYARC(lp, rp);
1117  return top;
1118  }
1119 
1120  /* if not a messy case, avoid hard part */
1121  assert(!MESSY(top->flags));
1122  f = top->flags | qprefer | ((atom != NULL) ? atom->flags : 0);
1123  if (atomtype != '(' && atomtype != BACKREF && !MESSY(UP(f)))
1124  {
1125  if (!(m == 1 && n == 1))
1126  repeat(v, lp, rp, m, n);
1127  if (atom != NULL)
1128  freesubre(v, atom);
1129  top->flags = f;
1130  return top;
1131  }
1132 
1133  /*
1134  * hard part: something messy
1135  *
1136  * That is, capturing parens, back reference, short/long clash, or an atom
1137  * with substructure containing one of those.
1138  */
1139 
1140  /* now we'll need a subre for the contents even if they're boring */
1141  if (atom == NULL)
1142  {
1143  atom = subre(v, '=', 0, lp, rp);
1144  NOERRN();
1145  }
1146 
1147  /*
1148  * For what follows, we need the atom to have its own begin/end states
1149  * that are distinct from lp/rp, so that we can wrap iteration structure
1150  * around it. The parenthesized-atom case above already made suitable
1151  * states (and we don't want to modify a capturing subre, since it's
1152  * already recorded in v->subs[]). Otherwise, we need more states.
1153  */
1154  if (atom->begin == lp || atom->end == rp)
1155  {
1156  s = newstate(v->nfa);
1157  s2 = newstate(v->nfa);
1158  NOERRN();
1159  moveouts(v->nfa, lp, s);
1160  moveins(v->nfa, rp, s2);
1161  atom->begin = s;
1162  atom->end = s2;
1163  }
1164  else
1165  {
1166  /* The atom's OK, but we must temporarily disconnect it from lp/rp */
1167  /* (this removes the EMPTY arcs we made above) */
1168  delsub(v->nfa, lp, atom->begin);
1169  delsub(v->nfa, atom->end, rp);
1170  }
1171 
1172  /*----------
1173  * Prepare a general-purpose state skeleton.
1174  *
1175  * In the no-backrefs case, we want this:
1176  *
1177  * [lp] ---> [s] ---prefix---> ---atom---> ---rest---> [rp]
1178  *
1179  * where prefix is some repetitions of atom, and "rest" is the remainder
1180  * of the branch. In the general case we need:
1181  *
1182  * [lp] ---> [s] ---iterator---> [s2] ---rest---> [rp]
1183  *
1184  * where the iterator wraps around the atom.
1185  *
1186  * We make the s state here for both cases; s2 is made below if needed
1187  *----------
1188  */
1189  s = newstate(v->nfa); /* set up starting state */
1190  NOERRN();
1191  EMPTYARC(lp, s);
1192  NOERRN();
1193 
1194  /* break remaining subRE into x{...} and what follows */
1195  t = subre(v, '.', COMBINE(qprefer, atom->flags), lp, rp);
1196  NOERRN();
1197  t->child = atom;
1198  atomp = &t->child;
1199 
1200  /*
1201  * Here we should recurse to fill t->child->sibling ... but we must
1202  * postpone that to the end. One reason is that t->child may be replaced
1203  * below, and we don't want to worry about its sibling link.
1204  */
1205 
1206  /*
1207  * Convert top node to a concatenation of the prefix (top->child, covering
1208  * whatever we parsed previously) and remaining (t). Note that the prefix
1209  * could be empty, in which case this concatenation node is unnecessary.
1210  * To keep things simple, we operate in a general way for now, and get rid
1211  * of unnecessary subres below.
1212  */
1213  assert(top->op == '=' && top->child == NULL);
1214  top->child = subre(v, '=', top->flags, top->begin, lp);
1215  NOERRN();
1216  top->op = '.';
1217  top->child->sibling = t;
1218  /* top->flags will get updated later */
1219 
1220  /* if it's a backref, now is the time to replicate the subNFA */
1221  if (atomtype == BACKREF)
1222  {
1223  assert(atom->begin->nouts == 1); /* just the EMPTY */
1224  delsub(v->nfa, atom->begin, atom->end);
1225  assert(v->subs[subno] != NULL);
1226 
1227  /*
1228  * And here's why the recursion got postponed: it must wait until the
1229  * skeleton is filled in, because it may hit a backref that wants to
1230  * copy the filled-in skeleton.
1231  */
1232  dupnfa(v->nfa, v->subs[subno]->begin, v->subs[subno]->end,
1233  atom->begin, atom->end);
1234  NOERRN();
1235 
1236  /* The backref node's NFA should not enforce any constraints */
1237  removeconstraints(v->nfa, atom->begin, atom->end);
1238  NOERRN();
1239  }
1240 
1241  /*
1242  * It's quantifier time. If the atom is just a backref, we'll let it deal
1243  * with quantifiers internally.
1244  */
1245  if (atomtype == BACKREF)
1246  {
1247  /* special case: backrefs have internal quantifiers */
1248  EMPTYARC(s, atom->begin); /* empty prefix */
1249  /* just stuff everything into atom */
1250  repeat(v, atom->begin, atom->end, m, n);
1251  atom->min = (short) m;
1252  atom->max = (short) n;
1253  atom->flags |= COMBINE(qprefer, atom->flags);
1254  /* rest of branch can be strung starting from atom->end */
1255  s2 = atom->end;
1256  }
1257  else if (m == 1 && n == 1 &&
1258  (qprefer == 0 ||
1259  (atom->flags & (LONGER | SHORTER | MIXED)) == 0 ||
1260  qprefer == (atom->flags & (LONGER | SHORTER | MIXED))))
1261  {
1262  /* no/vacuous quantifier: done */
1263  EMPTYARC(s, atom->begin); /* empty prefix */
1264  /* rest of branch can be strung starting from atom->end */
1265  s2 = atom->end;
1266  }
1267  else if (!(atom->flags & (CAP | BACKR)))
1268  {
1269  /*
1270  * If there's no captures nor backrefs in the atom being repeated, we
1271  * don't really care where the submatches of the iteration are, so we
1272  * don't need an iteration node. Make a plain DFA node instead.
1273  */
1274  EMPTYARC(s, atom->begin); /* empty prefix */
1275  repeat(v, atom->begin, atom->end, m, n);
1276  f = COMBINE(qprefer, atom->flags);
1277  t = subre(v, '=', f, atom->begin, atom->end);
1278  NOERRN();
1279  freesubre(v, atom);
1280  *atomp = t;
1281  /* rest of branch can be strung starting from t->end */
1282  s2 = t->end;
1283  }
1284  else if (m > 0 && !(atom->flags & BACKR))
1285  {
1286  /*
1287  * If there's no backrefs involved, we can turn x{m,n} into
1288  * x{m-1,n-1}x, with capturing parens in only the second x. This is
1289  * valid because we only care about capturing matches from the final
1290  * iteration of the quantifier. It's a win because we can implement
1291  * the backref-free left side as a plain DFA node, since we don't
1292  * really care where its submatches are.
1293  */
1294  dupnfa(v->nfa, atom->begin, atom->end, s, atom->begin);
1295  assert(m >= 1 && m != DUPINF && n >= 1);
1296  repeat(v, s, atom->begin, m - 1, (n == DUPINF) ? n : n - 1);
1297  f = COMBINE(qprefer, atom->flags);
1298  t = subre(v, '.', f, s, atom->end); /* prefix and atom */
1299  NOERRN();
1300  t->child = subre(v, '=', PREF(f), s, atom->begin);
1301  NOERRN();
1302  t->child->sibling = atom;
1303  *atomp = t;
1304  /* rest of branch can be strung starting from atom->end */
1305  s2 = atom->end;
1306  }
1307  else
1308  {
1309  /* general case: need an iteration node */
1310  s2 = newstate(v->nfa);
1311  NOERRN();
1312  moveouts(v->nfa, atom->end, s2);
1313  NOERRN();
1314  dupnfa(v->nfa, atom->begin, atom->end, s, s2);
1315  repeat(v, s, s2, m, n);
1316  f = COMBINE(qprefer, atom->flags);
1317  t = subre(v, '*', f, s, s2);
1318  NOERRN();
1319  t->min = (short) m;
1320  t->max = (short) n;
1321  t->child = atom;
1322  *atomp = t;
1323  /* rest of branch is to be strung from iteration's end state */
1324  }
1325 
1326  /* and finally, look after that postponed recursion */
1327  t = top->child->sibling;
1328  if (!(SEE('|') || SEE(stopper) || SEE(EOS)))
1329  {
1330  /* parse all the rest of the branch, and insert in t->child->sibling */
1331  t->child->sibling = parsebranch(v, stopper, type, s2, rp, 1);
1332  NOERRN();
1333  assert(SEE('|') || SEE(stopper) || SEE(EOS));
1334 
1335  /* here's the promised update of the flags */
1336  t->flags |= COMBINE(t->flags, t->child->sibling->flags);
1337  top->flags |= COMBINE(top->flags, t->flags);
1338 
1339  /* neither t nor top could be directly marked for capture as yet */
1340  assert(t->capno == 0);
1341  assert(top->capno == 0);
1342 
1343  /*
1344  * At this point both top and t are concatenation (op == '.') subres,
1345  * and we have top->child = prefix of branch, top->child->sibling = t,
1346  * t->child = messy atom (with quantification superstructure if
1347  * needed), t->child->sibling = rest of branch.
1348  *
1349  * If the messy atom was the first thing in the branch, then
1350  * top->child is vacuous and we can get rid of one level of
1351  * concatenation.
1352  */
1353  assert(top->child->op == '=');
1354  if (top->child->begin == top->child->end)
1355  {
1356  assert(!MESSY(top->child->flags));
1357  freesubre(v, top->child);
1358  top->child = t->child;
1359  freesrnode(v, t);
1360  }
1361 
1362  /*
1363  * Otherwise, it's possible that t->child is not messy in itself, but
1364  * we considered it messy because its greediness conflicts with what
1365  * preceded it. Then it could be that the combination of t->child and
1366  * the rest of the branch is also not messy, in which case we can get
1367  * rid of the child concatenation by merging t->child and the rest of
1368  * the branch into one plain DFA node.
1369  */
1370  else if (t->child->op == '=' &&
1371  t->child->sibling->op == '=' &&
1372  !MESSY(UP(t->child->flags | t->child->sibling->flags)))
1373  {
1374  t->op = '=';
1375  t->flags = COMBINE(t->child->flags, t->child->sibling->flags);
1376  freesubreandsiblings(v, t->child);
1377  t->child = NULL;
1378  }
1379  }
1380  else
1381  {
1382  /*
1383  * There's nothing left in the branch, so we don't need the second
1384  * concatenation node 't'. Just link s2 straight to rp.
1385  */
1386  EMPTYARC(s2, rp);
1387  top->child->sibling = t->child;
1388  top->flags |= COMBINE(top->flags, top->child->sibling->flags);
1389  freesrnode(v, t);
1390 
1391  /*
1392  * Again, it could be that top->child is vacuous (if the messy atom
1393  * was in fact the only thing in the branch). In that case we need no
1394  * concatenation at all; just replace top with top->child->sibling.
1395  */
1396  assert(top->child->op == '=');
1397  if (top->child->begin == top->child->end)
1398  {
1399  assert(!MESSY(top->child->flags));
1400  t = top->child->sibling;
1401  top->child->sibling = NULL;
1402  freesubre(v, top);
1403  top = t;
1404  }
1405  }
1406 
1407  return top;
1408 }
1409 
1410 /*
1411  * nonword - generate arcs for non-word-character ahead or behind
1412  */
1413 static void
1414 nonword(struct vars *v,
1415  int dir, /* AHEAD or BEHIND */
1416  struct state *lp,
1417  struct state *rp)
1418 {
1419  int anchor = (dir == AHEAD) ? '$' : '^';
1420 
1421  assert(dir == AHEAD || dir == BEHIND);
1422  newarc(v->nfa, anchor, 1, lp, rp);
1423  newarc(v->nfa, anchor, 0, lp, rp);
1424  colorcomplement(v->nfa, v->cm, dir, v->wordchrs, lp, rp);
1425  /* (no need for special attention to \n) */
1426 }
1427 
1428 /*
1429  * word - generate arcs for word character ahead or behind
1430  */
1431 static void
1432 word(struct vars *v,
1433  int dir, /* AHEAD or BEHIND */
1434  struct state *lp,
1435  struct state *rp)
1436 {
1437  assert(dir == AHEAD || dir == BEHIND);
1438  cloneouts(v->nfa, v->wordchrs, lp, rp, dir);
1439  /* (no need for special attention to \n) */
1440 }
1441 
1442 /*
1443  * charclass - generate arcs for a character class
1444  *
1445  * This is used for both atoms (\w and sibling escapes) and for elements
1446  * of bracket expressions. The caller is responsible for calling okcolors()
1447  * at the end of processing the atom or bracket.
1448  */
1449 static void
1450 charclass(struct vars *v,
1451  enum char_classes cls,
1452  struct state *lp,
1453  struct state *rp)
1454 {
1455  struct cvec *cv;
1456 
1457  /* obtain possibly-cached cvec for char class */
1458  NOTE(REG_ULOCALE);
1459  cv = cclasscvec(v, cls, (v->cflags & REG_ICASE));
1460  NOERR();
1461 
1462  /* build the arcs; this may cause color splitting */
1463  subcolorcvec(v, cv, lp, rp);
1464 }
1465 
1466 /*
1467  * charclasscomplement - generate arcs for a complemented character class
1468  *
1469  * This is used for both atoms (\W and sibling escapes) and for elements
1470  * of bracket expressions. In bracket expressions, it is the caller's
1471  * responsibility that there not be any open subcolors when this is called.
1472  */
1473 static void
1474 charclasscomplement(struct vars *v,
1475  enum char_classes cls,
1476  struct state *lp,
1477  struct state *rp)
1478 {
1479  struct state *cstate;
1480  struct cvec *cv;
1481 
1482  /* make dummy state to hang temporary arcs on */
1483  cstate = newstate(v->nfa);
1484  NOERR();
1485 
1486  /* obtain possibly-cached cvec for char class */
1487  NOTE(REG_ULOCALE);
1488  cv = cclasscvec(v, cls, (v->cflags & REG_ICASE));
1489  NOERR();
1490 
1491  /* build arcs for char class; this may cause color splitting */
1492  subcolorcvec(v, cv, cstate, cstate);
1493  NOERR();
1494 
1495  /* clean up any subcolors in the arc set */
1496  okcolors(v->nfa, v->cm);
1497  NOERR();
1498 
1499  /* now build output arcs for the complement of the char class */
1500  colorcomplement(v->nfa, v->cm, PLAIN, cstate, lp, rp);
1501  NOERR();
1502 
1503  /* clean up dummy state */
1504  dropstate(v->nfa, cstate);
1505 }
1506 
1507 /*
1508  * scannum - scan a number
1509  */
1510 static int /* value, <= DUPMAX */
1511 scannum(struct vars *v)
1512 {
1513  int n = 0;
1514 
1515  while (SEE(DIGIT) && n < DUPMAX)
1516  {
1517  n = n * 10 + v->nextvalue;
1518  NEXT();
1519  }
1520  if (SEE(DIGIT) || n > DUPMAX)
1521  {
1522  ERR(REG_BADBR);
1523  return 0;
1524  }
1525  return n;
1526 }
1527 
1528 /*
1529  * repeat - replicate subNFA for quantifiers
1530  *
1531  * The sub-NFA strung from lp to rp is modified to represent m to n
1532  * repetitions of its initial contents.
1533  *
1534  * The duplication sequences used here are chosen carefully so that any
1535  * pointers starting out pointing into the subexpression end up pointing into
1536  * the last occurrence. (Note that it may not be strung between the same
1537  * left and right end states, however!) This used to be important for the
1538  * subRE tree, although the important bits are now handled by the in-line
1539  * code in parse(), and when this is called, it doesn't matter any more.
1540  */
1541 static void
1542 repeat(struct vars *v,
1543  struct state *lp,
1544  struct state *rp,
1545  int m,
1546  int n)
1547 {
1548 #define SOME 2
1549 #define INF 3
1550 #define PAIR(x, y) ((x)*4 + (y))
1551 #define REDUCE(x) ( ((x) == DUPINF) ? INF : (((x) > 1) ? SOME : (x)) )
1552  const int rm = REDUCE(m);
1553  const int rn = REDUCE(n);
1554  struct state *s;
1555  struct state *s2;
1556 
1557  switch (PAIR(rm, rn))
1558  {
1559  case PAIR(0, 0): /* empty string */
1560  delsub(v->nfa, lp, rp);
1561  EMPTYARC(lp, rp);
1562  break;
1563  case PAIR(0, 1): /* do as x| */
1564  EMPTYARC(lp, rp);
1565  break;
1566  case PAIR(0, SOME): /* do as x{1,n}| */
1567  repeat(v, lp, rp, 1, n);
1568  NOERR();
1569  EMPTYARC(lp, rp);
1570  break;
1571  case PAIR(0, INF): /* loop x around */
1572  s = newstate(v->nfa);
1573  NOERR();
1574  moveouts(v->nfa, lp, s);
1575  moveins(v->nfa, rp, s);
1576  EMPTYARC(lp, s);
1577  EMPTYARC(s, rp);
1578  break;
1579  case PAIR(1, 1): /* no action required */
1580  break;
1581  case PAIR(1, SOME): /* do as x{0,n-1}x = (x{1,n-1}|)x */
1582  s = newstate(v->nfa);
1583  NOERR();
1584  moveouts(v->nfa, lp, s);
1585  dupnfa(v->nfa, s, rp, lp, s);
1586  NOERR();
1587  repeat(v, lp, s, 1, n - 1);
1588  NOERR();
1589  EMPTYARC(lp, s);
1590  break;
1591  case PAIR(1, INF): /* add loopback arc */
1592  s = newstate(v->nfa);
1593  s2 = newstate(v->nfa);
1594  NOERR();
1595  moveouts(v->nfa, lp, s);
1596  moveins(v->nfa, rp, s2);
1597  EMPTYARC(lp, s);
1598  EMPTYARC(s2, rp);
1599  EMPTYARC(s2, s);
1600  break;
1601  case PAIR(SOME, SOME): /* do as x{m-1,n-1}x */
1602  s = newstate(v->nfa);
1603  NOERR();
1604  moveouts(v->nfa, lp, s);
1605  dupnfa(v->nfa, s, rp, lp, s);
1606  NOERR();
1607  repeat(v, lp, s, m - 1, n - 1);
1608  break;
1609  case PAIR(SOME, INF): /* do as x{m-1,}x */
1610  s = newstate(v->nfa);
1611  NOERR();
1612  moveouts(v->nfa, lp, s);
1613  dupnfa(v->nfa, s, rp, lp, s);
1614  NOERR();
1615  repeat(v, lp, s, m - 1, n);
1616  break;
1617  default:
1618  ERR(REG_ASSERT);
1619  break;
1620  }
1621 }
1622 
1623 /*
1624  * bracket - handle non-complemented bracket expression
1625  *
1626  * Also called from cbracket for complemented bracket expressions.
1627  */
1628 static void
1629 bracket(struct vars *v,
1630  struct state *lp,
1631  struct state *rp)
1632 {
1633  /*
1634  * We can't process complemented char classes (e.g. \W) immediately while
1635  * scanning the bracket expression, else color bookkeeping gets confused.
1636  * Instead, remember whether we saw any in have_cclassc[], and process
1637  * them at the end.
1638  */
1639  bool have_cclassc[NUM_CCLASSES];
1640  bool any_cclassc;
1641  int i;
1642 
1643  memset(have_cclassc, false, sizeof(have_cclassc));
1644 
1645  assert(SEE('['));
1646  NEXT();
1647  while (!SEE(']') && !SEE(EOS))
1648  brackpart(v, lp, rp, have_cclassc);
1649  assert(SEE(']') || ISERR());
1650 
1651  /* close up open subcolors from the positive bracket elements */
1652  okcolors(v->nfa, v->cm);
1653  NOERR();
1654 
1655  /* now handle any complemented elements */
1656  any_cclassc = false;
1657  for (i = 0; i < NUM_CCLASSES; i++)
1658  {
1659  if (have_cclassc[i])
1660  {
1661  charclasscomplement(v, (enum char_classes) i, lp, rp);
1662  NOERR();
1663  any_cclassc = true;
1664  }
1665  }
1666 
1667  /*
1668  * If we had any complemented elements, see if we can optimize the bracket
1669  * into a rainbow. Since a complemented element is the only way a WHITE
1670  * arc could get into the result, there's no point in checking otherwise.
1671  */
1672  if (any_cclassc)
1673  optimizebracket(v, lp, rp);
1674 }
1675 
1676 /*
1677  * cbracket - handle complemented bracket expression
1678  *
1679  * We do it by calling bracket() with dummy endpoints, and then complementing
1680  * the result. The alternative would be to invoke rainbow(), and then delete
1681  * arcs as the b.e. is seen... but that gets messy, and is really quite
1682  * infeasible now that rainbow() just puts out one RAINBOW arc.
1683  */
1684 static void
1685 cbracket(struct vars *v,
1686  struct state *lp,
1687  struct state *rp)
1688 {
1689  struct state *left = newstate(v->nfa);
1690  struct state *right = newstate(v->nfa);
1691 
1692  NOERR();
1693  bracket(v, left, right);
1694 
1695  /* in NLSTOP mode, ensure newline is not part of the result set */
1696  if (v->cflags & REG_NLSTOP)
1697  newarc(v->nfa, PLAIN, v->nlcolor, left, right);
1698  NOERR();
1699 
1700  assert(lp->nouts == 0); /* all outarcs will be ours */
1701 
1702  /*
1703  * Easy part of complementing, and all there is to do since the MCCE code
1704  * was removed. Note that the result of colorcomplement() cannot be a
1705  * rainbow, since we don't allow empty brackets; so there's no point in
1706  * calling optimizebracket() again.
1707  */
1708  colorcomplement(v->nfa, v->cm, PLAIN, left, lp, rp);
1709  NOERR();
1710  dropstate(v->nfa, left);
1711  assert(right->nins == 0);
1712  freestate(v->nfa, right);
1713 }
1714 
1715 /*
1716  * brackpart - handle one item (or range) within a bracket expression
1717  */
1718 static void
1719 brackpart(struct vars *v,
1720  struct state *lp,
1721  struct state *rp,
1722  bool *have_cclassc)
1723 {
1724  chr startc;
1725  chr endc;
1726  struct cvec *cv;
1727  enum char_classes cls;
1728  const chr *startp;
1729  const chr *endp;
1730 
1731  /* parse something, get rid of special cases, take shortcuts */
1732  switch (v->nexttype)
1733  {
1734  case RANGE: /* a-b-c or other botch */
1735  ERR(REG_ERANGE);
1736  return;
1737  break;
1738  case PLAIN:
1739  startc = v->nextvalue;
1740  NEXT();
1741  /* shortcut for ordinary chr (not range) */
1742  if (!SEE(RANGE))
1743  {
1744  onechr(v, startc, lp, rp);
1745  return;
1746  }
1747  NOERR();
1748  break;
1749  case COLLEL:
1750  startp = v->now;
1751  endp = scanplain(v);
1752  INSIST(startp < endp, REG_ECOLLATE);
1753  NOERR();
1754  startc = element(v, startp, endp);
1755  NOERR();
1756  break;
1757  case ECLASS:
1758  startp = v->now;
1759  endp = scanplain(v);
1760  INSIST(startp < endp, REG_ECOLLATE);
1761  NOERR();
1762  startc = element(v, startp, endp);
1763  NOERR();
1764  cv = eclass(v, startc, (v->cflags & REG_ICASE));
1765  NOERR();
1766  subcolorcvec(v, cv, lp, rp);
1767  return;
1768  break;
1769  case CCLASS:
1770  startp = v->now;
1771  endp = scanplain(v);
1772  INSIST(startp < endp, REG_ECTYPE);
1773  NOERR();
1774  cls = lookupcclass(v, startp, endp);
1775  NOERR();
1776  charclass(v, cls, lp, rp);
1777  return;
1778  break;
1779  case CCLASSS:
1780  charclass(v, (enum char_classes) v->nextvalue, lp, rp);
1781  NEXT();
1782  return;
1783  break;
1784  case CCLASSC:
1785  /* we cannot call charclasscomplement() immediately */
1786  have_cclassc[v->nextvalue] = true;
1787  NEXT();
1788  return;
1789  break;
1790  default:
1791  ERR(REG_ASSERT);
1792  return;
1793  break;
1794  }
1795 
1796  if (SEE(RANGE))
1797  {
1798  NEXT();
1799  switch (v->nexttype)
1800  {
1801  case PLAIN:
1802  case RANGE:
1803  endc = v->nextvalue;
1804  NEXT();
1805  NOERR();
1806  break;
1807  case COLLEL:
1808  startp = v->now;
1809  endp = scanplain(v);
1810  INSIST(startp < endp, REG_ECOLLATE);
1811  NOERR();
1812  endc = element(v, startp, endp);
1813  NOERR();
1814  break;
1815  default:
1816  ERR(REG_ERANGE);
1817  return;
1818  break;
1819  }
1820  }
1821  else
1822  endc = startc;
1823 
1824  /*
1825  * Ranges are unportable. Actually, standard C does guarantee that digits
1826  * are contiguous, but making that an exception is just too complicated.
1827  */
1828  if (startc != endc)
1829  NOTE(REG_UUNPORT);
1830  cv = range(v, startc, endc, (v->cflags & REG_ICASE));
1831  NOERR();
1832  subcolorcvec(v, cv, lp, rp);
1833 }
1834 
1835 /*
1836  * scanplain - scan PLAIN contents of [. etc.
1837  *
1838  * Certain bits of trickery in regc_lex.c know that this code does not try
1839  * to look past the final bracket of the [. etc.
1840  */
1841 static const chr * /* just after end of sequence */
1842 scanplain(struct vars *v)
1843 {
1844  const chr *endp;
1845 
1846  assert(SEE(COLLEL) || SEE(ECLASS) || SEE(CCLASS));
1847  NEXT();
1848 
1849  endp = v->now;
1850  while (SEE(PLAIN))
1851  {
1852  endp = v->now;
1853  NEXT();
1854  }
1855 
1856  assert(SEE(END) || ISERR());
1857  NEXT();
1858 
1859  return endp;
1860 }
1861 
1862 /*
1863  * onechr - fill in arcs for a plain character, and possible case complements
1864  * This is mostly a shortcut for efficient handling of the common case.
1865  */
1866 static void
1867 onechr(struct vars *v,
1868  chr c,
1869  struct state *lp,
1870  struct state *rp)
1871 {
1872  if (!(v->cflags & REG_ICASE))
1873  {
1874  color lastsubcolor = COLORLESS;
1875 
1876  subcoloronechr(v, c, lp, rp, &lastsubcolor);
1877  return;
1878  }
1879 
1880  /* rats, need general case anyway... */
1881  subcolorcvec(v, allcases(v, c), lp, rp);
1882 }
1883 
1884 /*
1885  * optimizebracket - see if bracket expression can be converted to RAINBOW
1886  *
1887  * Cases such as "[\s\S]" can produce a set of arcs of all colors, which we
1888  * can replace by a single RAINBOW arc for efficiency. (This might seem
1889  * like a silly way to write ".", but it's seemingly a common locution in
1890  * some other flavors of regex, so take the trouble to support it well.)
1891  */
1892 static void
1893 optimizebracket(struct vars *v,
1894  struct state *lp,
1895  struct state *rp)
1896 {
1897  struct colordesc *cd;
1898  struct colordesc *end = CDEND(v->cm);
1899  struct arc *a;
1900  bool israinbow;
1901 
1902  /*
1903  * Scan lp's out-arcs and transiently mark the mentioned colors. We
1904  * expect that all of lp's out-arcs are plain, non-RAINBOW arcs to rp.
1905  * (Note: there shouldn't be any pseudocolors yet, but check anyway.)
1906  */
1907  for (a = lp->outs; a != NULL; a = a->outchain)
1908  {
1909  assert(a->type == PLAIN);
1910  assert(a->co >= 0); /* i.e. not RAINBOW */
1911  assert(a->to == rp);
1912  cd = &v->cm->cd[a->co];
1913  assert(!UNUSEDCOLOR(cd) && !(cd->flags & PSEUDO));
1914  cd->flags |= COLMARK;
1915  }
1916 
1917  /* Scan colors, clear transient marks, check for unmarked live colors */
1918  israinbow = true;
1919  for (cd = v->cm->cd; cd < end; cd++)
1920  {
1921  if (cd->flags & COLMARK)
1922  cd->flags &= ~COLMARK;
1923  else if (!UNUSEDCOLOR(cd) && !(cd->flags & PSEUDO))
1924  israinbow = false;
1925  }
1926 
1927  /* Can't do anything if not all colors have arcs */
1928  if (!israinbow)
1929  return;
1930 
1931  /* OK, drop existing arcs and replace with a rainbow */
1932  while ((a = lp->outs) != NULL)
1933  freearc(v->nfa, a);
1934  newarc(v->nfa, PLAIN, RAINBOW, lp, rp);
1935 }
1936 
1937 /*
1938  * wordchrs - set up word-chr list for word-boundary stuff, if needed
1939  *
1940  * The list is kept as a bunch of circular arcs on an otherwise-unused state.
1941  *
1942  * Note that this must not be called while we have any open subcolors,
1943  * else construction of the list would confuse color bookkeeping.
1944  * Hence, we can't currently apply a similar optimization in
1945  * charclass[complement](), as those need to be usable within bracket
1946  * expressions.
1947  */
1948 static void
1949 wordchrs(struct vars *v)
1950 {
1951  struct state *cstate;
1952  struct cvec *cv;
1953 
1954  if (v->wordchrs != NULL)
1955  return; /* done already */
1956 
1957  /* make dummy state to hang the cache arcs on */
1958  cstate = newstate(v->nfa);
1959  NOERR();
1960 
1961  /* obtain possibly-cached cvec for \w characters */
1962  NOTE(REG_ULOCALE);
1963  cv = cclasscvec(v, CC_WORD, (v->cflags & REG_ICASE));
1964  NOERR();
1965 
1966  /* build the arcs; this may cause color splitting */
1967  subcolorcvec(v, cv, cstate, cstate);
1968  NOERR();
1969 
1970  /* close new open subcolors to ensure the cache entry is self-contained */
1971  okcolors(v->nfa, v->cm);
1972  NOERR();
1973 
1974  /* success! save the cache pointer */
1975  v->wordchrs = cstate;
1976 }
1977 
1978 /*
1979  * processlacon - generate the NFA representation of a LACON
1980  *
1981  * In the general case this is just newlacon() + newarc(), but some cases
1982  * can be optimized.
1983  */
1984 static void
1985 processlacon(struct vars *v,
1986  struct state *begin, /* start of parsed LACON sub-re */
1987  struct state *end, /* end of parsed LACON sub-re */
1988  int latype,
1989  struct state *lp, /* left state to hang it on */
1990  struct state *rp) /* right state to hang it on */
1991 {
1992  struct state *s1;
1993  int n;
1994 
1995  /*
1996  * Check for lookaround RE consisting of a single plain color arc (or set
1997  * of arcs); this would typically be a simple chr or a bracket expression.
1998  */
1999  s1 = single_color_transition(begin, end);
2000  switch (latype)
2001  {
2002  case LATYPE_AHEAD_POS:
2003  /* If lookahead RE is just colorset C, convert to AHEAD(C) */
2004  if (s1 != NULL)
2005  {
2006  cloneouts(v->nfa, s1, lp, rp, AHEAD);
2007  return;
2008  }
2009  break;
2010  case LATYPE_AHEAD_NEG:
2011  /* If lookahead RE is just colorset C, convert to AHEAD(^C)|$ */
2012  if (s1 != NULL)
2013  {
2014  colorcomplement(v->nfa, v->cm, AHEAD, s1, lp, rp);
2015  newarc(v->nfa, '$', 1, lp, rp);
2016  newarc(v->nfa, '$', 0, lp, rp);
2017  return;
2018  }
2019  break;
2020  case LATYPE_BEHIND_POS:
2021  /* If lookbehind RE is just colorset C, convert to BEHIND(C) */
2022  if (s1 != NULL)
2023  {
2024  cloneouts(v->nfa, s1, lp, rp, BEHIND);
2025  return;
2026  }
2027  break;
2028  case LATYPE_BEHIND_NEG:
2029  /* If lookbehind RE is just colorset C, convert to BEHIND(^C)|^ */
2030  if (s1 != NULL)
2031  {
2032  colorcomplement(v->nfa, v->cm, BEHIND, s1, lp, rp);
2033  newarc(v->nfa, '^', 1, lp, rp);
2034  newarc(v->nfa, '^', 0, lp, rp);
2035  return;
2036  }
2037  break;
2038  default:
2039  assert(NOTREACHED);
2040  }
2041 
2042  /* General case: we need a LACON subre and arc */
2043  n = newlacon(v, begin, end, latype);
2044  newarc(v->nfa, LACON, n, lp, rp);
2045 }
2046 
2047 /*
2048  * subre - allocate a subre
2049  */
2050 static struct subre *
2051 subre(struct vars *v,
2052  int op,
2053  int flags,
2054  struct state *begin,
2055  struct state *end)
2056 {
2057  struct subre *ret = v->treefree;
2058 
2059  /*
2060  * Checking for stack overflow here is sufficient to protect parse() and
2061  * its recursive subroutines.
2062  */
2063  if (STACK_TOO_DEEP(v->re))
2064  {
2065  ERR(REG_ETOOBIG);
2066  return NULL;
2067  }
2068 
2069  if (ret != NULL)
2070  v->treefree = ret->child;
2071  else
2072  {
2073  ret = (struct subre *) MALLOC(sizeof(struct subre));
2074  if (ret == NULL)
2075  {
2076  ERR(REG_ESPACE);
2077  return NULL;
2078  }
2079  ret->chain = v->treechain;
2080  v->treechain = ret;
2081  }
2082 
2083  assert(strchr("=b|.*(", op) != NULL);
2084 
2085  ret->op = op;
2086  ret->flags = flags;
2087  ret->latype = (char) -1;
2088  ret->id = 0; /* will be assigned later */
2089  ret->capno = 0;
2090  ret->backno = 0;
2091  ret->min = ret->max = 1;
2092  ret->child = NULL;
2093  ret->sibling = NULL;
2094  ret->begin = begin;
2095  ret->end = end;
2096  ZAPCNFA(ret->cnfa);
2097 
2098  return ret;
2099 }
2100 
2101 /*
2102  * freesubre - free a subRE subtree
2103  *
2104  * This frees child node(s) of the given subRE too,
2105  * but not its siblings.
2106  */
2107 static void
2108 freesubre(struct vars *v, /* might be NULL */
2109  struct subre *sr)
2110 {
2111  if (sr == NULL)
2112  return;
2113 
2114  if (sr->child != NULL)
2115  freesubreandsiblings(v, sr->child);
2116 
2117  freesrnode(v, sr);
2118 }
2119 
2120 /*
2121  * freesubreandsiblings - free a subRE subtree
2122  *
2123  * This frees child node(s) of the given subRE too,
2124  * as well as any following siblings.
2125  */
2126 static void
2127 freesubreandsiblings(struct vars *v, /* might be NULL */
2128  struct subre *sr)
2129 {
2130  while (sr != NULL)
2131  {
2132  struct subre *next = sr->sibling;
2133 
2134  freesubre(v, sr);
2135  sr = next;
2136  }
2137 }
2138 
2139 /*
2140  * freesrnode - free one node in a subRE subtree
2141  */
2142 static void
2143 freesrnode(struct vars *v, /* might be NULL */
2144  struct subre *sr)
2145 {
2146  if (sr == NULL)
2147  return;
2148 
2149  if (!NULLCNFA(sr->cnfa))
2150  freecnfa(&sr->cnfa);
2151  sr->flags = 0; /* in particular, not INUSE */
2152  sr->child = sr->sibling = NULL;
2153  sr->begin = sr->end = NULL;
2154 
2155  if (v != NULL && v->treechain != NULL)
2156  {
2157  /* we're still parsing, maybe we can reuse the subre */
2158  sr->child = v->treefree;
2159  v->treefree = sr;
2160  }
2161  else
2162  FREE(sr);
2163 }
2164 
2165 /*
2166  * removecaptures - remove unnecessary capture subREs
2167  *
2168  * If the caller said that it doesn't care about subexpression match data,
2169  * we may delete the "capture" markers on subREs that are not referenced
2170  * by any backrefs, and then simplify anything that's become non-messy.
2171  * Call this only if REG_NOSUB flag is set.
2172  */
2173 static void
2174 removecaptures(struct vars *v,
2175  struct subre *t)
2176 {
2177  struct subre *t2;
2178 
2179  assert(t != NULL);
2180 
2181  /*
2182  * If this isn't itself a backref target, clear capno and tentatively
2183  * clear CAP flag.
2184  */
2185  if (!(t->flags & BRUSE))
2186  {
2187  t->capno = 0;
2188  t->flags &= ~CAP;
2189  }
2190 
2191  /* Now recurse to children */
2192  for (t2 = t->child; t2 != NULL; t2 = t2->sibling)
2193  {
2194  removecaptures(v, t2);
2195  /* Propagate child CAP flag back up, if it's still set */
2196  if (t2->flags & CAP)
2197  t->flags |= CAP;
2198  }
2199 
2200  /*
2201  * If t now contains neither captures nor backrefs, there's no longer any
2202  * need to care where its sub-match boundaries are, so we can reduce it to
2203  * a simple DFA node. (Note in particular that MIXED child greediness is
2204  * not a hindrance here, so we don't use the MESSY() macro.)
2205  */
2206  if ((t->flags & (CAP | BACKR)) == 0)
2207  {
2208  if (t->child)
2209  freesubreandsiblings(v, t->child);
2210  t->child = NULL;
2211  t->op = '=';
2212  t->flags &= ~MIXED;
2213  }
2214 }
2215 
2216 /*
2217  * numst - number tree nodes (assigning "id" indexes)
2218  */
2219 static int /* next number */
2220 numst(struct subre *t,
2221  int start) /* starting point for subtree numbers */
2222 {
2223  int i;
2224  struct subre *t2;
2225 
2226  assert(t != NULL);
2227 
2228  i = start;
2229  t->id = i++;
2230  for (t2 = t->child; t2 != NULL; t2 = t2->sibling)
2231  i = numst(t2, i);
2232  return i;
2233 }
2234 
2235 /*
2236  * markst - mark tree nodes as INUSE
2237  *
2238  * Note: this is a great deal more subtle than it looks. During initial
2239  * parsing of a regex, all subres are linked into the treechain list;
2240  * discarded ones are also linked into the treefree list for possible reuse.
2241  * After we are done creating all subres required for a regex, we run markst()
2242  * then cleanst(), which results in discarding all subres not reachable from
2243  * v->tree. We then clear v->treechain, indicating that subres must be found
2244  * by descending from v->tree. This changes the behavior of freesubre(): it
2245  * will henceforth FREE() unwanted subres rather than sticking them into the
2246  * treefree list. (Doing that any earlier would result in dangling links in
2247  * the treechain list.) This all means that freev() will clean up correctly
2248  * if invoked before or after markst()+cleanst(); but it would not work if
2249  * called partway through this state conversion, so we mustn't error out
2250  * in or between these two functions.
2251  */
2252 static void
2253 markst(struct subre *t)
2254 {
2255  struct subre *t2;
2256 
2257  assert(t != NULL);
2258 
2259  t->flags |= INUSE;
2260  for (t2 = t->child; t2 != NULL; t2 = t2->sibling)
2261  markst(t2);
2262 }
2263 
2264 /*
2265  * cleanst - free any tree nodes not marked INUSE
2266  */
2267 static void
2268 cleanst(struct vars *v)
2269 {
2270  struct subre *t;
2271  struct subre *next;
2272 
2273  for (t = v->treechain; t != NULL; t = next)
2274  {
2275  next = t->chain;
2276  if (!(t->flags & INUSE))
2277  FREE(t);
2278  }
2279  v->treechain = NULL;
2280  v->treefree = NULL; /* just on general principles */
2281 }
2282 
2283 /*
2284  * nfatree - turn a subRE subtree into a tree of compacted NFAs
2285  */
2286 static long /* optimize results from top node */
2287 nfatree(struct vars *v,
2288  struct subre *t,
2289  FILE *f) /* for debug output */
2290 {
2291  struct subre *t2;
2292 
2293  assert(t != NULL && t->begin != NULL);
2294 
2295  for (t2 = t->child; t2 != NULL; t2 = t2->sibling)
2296  (DISCARD) nfatree(v, t2, f);
2297 
2298  return nfanode(v, t, 0, f);
2299 }
2300 
2301 /*
2302  * nfanode - do one NFA for nfatree or lacons
2303  *
2304  * If converttosearch is true, apply makesearch() to the NFA.
2305  */
2306 static long /* optimize results */
2307 nfanode(struct vars *v,
2308  struct subre *t,
2309  int converttosearch,
2310  FILE *f) /* for debug output */
2311 {
2312  struct nfa *nfa;
2313  long ret = 0;
2314 
2315  assert(t->begin != NULL);
2316 
2317 #ifdef REG_DEBUG
2318  if (f != NULL)
2319  {
2320  char idbuf[50];
2321 
2322  fprintf(f, "\n\n\n========= TREE NODE %s ==========\n",
2323  stid(t, idbuf, sizeof(idbuf)));
2324  }
2325 #endif
2326  nfa = newnfa(v, v->cm, v->nfa);
2327  NOERRZ();
2328  dupnfa(nfa, t->begin, t->end, nfa->init, nfa->final);
2329  if (!ISERR())
2330  specialcolors(nfa);
2331  if (!ISERR())
2332  ret = optimize(nfa, f);
2333  if (converttosearch && !ISERR())
2334  makesearch(v, nfa);
2335  if (!ISERR())
2336  compact(nfa, &t->cnfa);
2337 
2338  freenfa(nfa);
2339  return ret;
2340 }
2341 
2342 /*
2343  * newlacon - allocate a lookaround-constraint subRE
2344  */
2345 static int /* lacon number */
2346 newlacon(struct vars *v,
2347  struct state *begin,
2348  struct state *end,
2349  int latype)
2350 {
2351  int n;
2352  struct subre *newlacons;
2353  struct subre *sub;
2354 
2355  if (v->nlacons == 0)
2356  {
2357  n = 1; /* skip 0th */
2358  newlacons = (struct subre *) MALLOC(2 * sizeof(struct subre));
2359  }
2360  else
2361  {
2362  n = v->nlacons;
2363  newlacons = (struct subre *) REALLOC(v->lacons,
2364  (n + 1) * sizeof(struct subre));
2365  }
2366  if (newlacons == NULL)
2367  {
2368  ERR(REG_ESPACE);
2369  return 0;
2370  }
2371  v->lacons = newlacons;
2372  v->nlacons = n + 1;
2373  sub = &v->lacons[n];
2374  sub->begin = begin;
2375  sub->end = end;
2376  sub->latype = latype;
2377  ZAPCNFA(sub->cnfa);
2378  return n;
2379 }
2380 
2381 /*
2382  * freelacons - free lookaround-constraint subRE vector
2383  */
2384 static void
2385 freelacons(struct subre *subs,
2386  int n)
2387 {
2388  struct subre *sub;
2389  int i;
2390 
2391  assert(n > 0);
2392  for (sub = subs + 1, i = n - 1; i > 0; sub++, i--) /* no 0th */
2393  if (!NULLCNFA(sub->cnfa))
2394  freecnfa(&sub->cnfa);
2395  FREE(subs);
2396 }
2397 
2398 /*
2399  * rfree - free a whole RE (insides of regfree)
2400  */
2401 static void
2402 rfree(regex_t *re)
2403 {
2404  struct guts *g;
2405 
2406  if (re == NULL || re->re_magic != REMAGIC)
2407  return;
2408 
2409  re->re_magic = 0; /* invalidate RE */
2410  g = (struct guts *) re->re_guts;
2411  re->re_guts = NULL;
2412  re->re_fns = NULL;
2413  if (g != NULL)
2414  {
2415  g->magic = 0;
2416  freecm(&g->cmap);
2417  if (g->tree != NULL)
2418  freesubre((struct vars *) NULL, g->tree);
2419  if (g->lacons != NULL)
2420  freelacons(g->lacons, g->nlacons);
2421  if (!NULLCNFA(g->search))
2422  freecnfa(&g->search);
2423  FREE(g);
2424  }
2425 }
2426 
2427 /*
2428  * rcancelrequested - check for external request to cancel regex operation
2429  *
2430  * Return nonzero to fail the operation with error code REG_CANCEL,
2431  * zero to keep going
2432  *
2433  * The current implementation is Postgres-specific. If we ever get around
2434  * to splitting the regex code out as a standalone library, there will need
2435  * to be some API to let applications define a callback function for this.
2436  */
2437 static int
2438 rcancelrequested(void)
2439 {
2440  return InterruptPending && (QueryCancelPending || ProcDiePending);
2441 }
2442 
2443 /*
2444  * rstacktoodeep - check for stack getting dangerously deep
2445  *
2446  * Return nonzero to fail the operation with error code REG_ETOOBIG,
2447  * zero to keep going
2448  *
2449  * The current implementation is Postgres-specific. If we ever get around
2450  * to splitting the regex code out as a standalone library, there will need
2451  * to be some API to let applications define a callback function for this.
2452  */
2453 static int
2454 rstacktoodeep(void)
2455 {
2456  return stack_is_too_deep();
2457 }
2458 
2459 #ifdef REG_DEBUG
2460 
2461 /*
2462  * dump - dump an RE in human-readable form
2463  */
2464 static void
2465 dump(regex_t *re,
2466  FILE *f)
2467 {
2468  struct guts *g;
2469  int i;
2470 
2471  if (re->re_magic != REMAGIC)
2472  fprintf(f, "bad magic number (0x%x not 0x%x)\n", re->re_magic,
2473  REMAGIC);
2474  if (re->re_guts == NULL)
2475  {
2476  fprintf(f, "NULL guts!!!\n");
2477  return;
2478  }
2479  g = (struct guts *) re->re_guts;
2480  if (g->magic != GUTSMAGIC)
2481  fprintf(f, "bad guts magic number (0x%x not 0x%x)\n", g->magic,
2482  GUTSMAGIC);
2483 
2484  fprintf(f, "\n\n\n========= DUMP ==========\n");
2485  fprintf(f, "nsub %d, info 0%lo, csize %d, ntree %d\n",
2486  (int) re->re_nsub, re->re_info, re->re_csize, g->ntree);
2487 
2488  dumpcolors(&g->cmap, f);
2489  if (!NULLCNFA(g->search))
2490  {
2491  fprintf(f, "\nsearch:\n");
2492  dumpcnfa(&g->search, f);
2493  }
2494  for (i = 1; i < g->nlacons; i++)
2495  {
2496  struct subre *lasub = &g->lacons[i];
2497  const char *latype;
2498 
2499  switch (lasub->latype)
2500  {
2501  case LATYPE_AHEAD_POS:
2502  latype = "positive lookahead";
2503  break;
2504  case LATYPE_AHEAD_NEG:
2505  latype = "negative lookahead";
2506  break;
2507  case LATYPE_BEHIND_POS:
2508  latype = "positive lookbehind";
2509  break;
2510  case LATYPE_BEHIND_NEG:
2511  latype = "negative lookbehind";
2512  break;
2513  default:
2514  latype = "???";
2515  break;
2516  }
2517  fprintf(f, "\nla%d (%s):\n", i, latype);
2518  dumpcnfa(&lasub->cnfa, f);
2519  }
2520  fprintf(f, "\n");
2521  dumpst(g->tree, f, 0);
2522 }
2523 
2524 /*
2525  * dumpst - dump a subRE tree
2526  */
2527 static void
2528 dumpst(struct subre *t,
2529  FILE *f,
2530  int nfapresent) /* is the original NFA still around? */
2531 {
2532  if (t == NULL)
2533  fprintf(f, "null tree\n");
2534  else
2535  stdump(t, f, nfapresent);
2536  fflush(f);
2537 }
2538 
2539 /*
2540  * stdump - recursive guts of dumpst
2541  */
2542 static void
2543 stdump(struct subre *t,
2544  FILE *f,
2545  int nfapresent) /* is the original NFA still around? */
2546 {
2547  char idbuf[50];
2548  struct subre *t2;
2549 
2550  fprintf(f, "%s. `%c'", stid(t, idbuf, sizeof(idbuf)), t->op);
2551  if (t->flags & LONGER)
2552  fprintf(f, " longest");
2553  if (t->flags & SHORTER)
2554  fprintf(f, " shortest");
2555  if (t->flags & MIXED)
2556  fprintf(f, " hasmixed");
2557  if (t->flags & CAP)
2558  fprintf(f, " hascapture");
2559  if (t->flags & BACKR)
2560  fprintf(f, " hasbackref");
2561  if (t->flags & BRUSE)
2562  fprintf(f, " isreferenced");
2563  if (!(t->flags & INUSE))
2564  fprintf(f, " UNUSED");
2565  if (t->latype != (char) -1)
2566  fprintf(f, " latype(%d)", t->latype);
2567  if (t->capno != 0)
2568  fprintf(f, " capture(%d)", t->capno);
2569  if (t->backno != 0)
2570  fprintf(f, " backref(%d)", t->backno);
2571  if (t->min != 1 || t->max != 1)
2572  {
2573  fprintf(f, " {%d,", t->min);
2574  if (t->max != DUPINF)
2575  fprintf(f, "%d", t->max);
2576  fprintf(f, "}");
2577  }
2578  if (nfapresent)
2579  fprintf(f, " %ld-%ld", (long) t->begin->no, (long) t->end->no);
2580  if (t->child != NULL)
2581  fprintf(f, " C:%s", stid(t->child, idbuf, sizeof(idbuf)));
2582  /* printing second child isn't necessary, but it is often helpful */
2583  if (t->child != NULL && t->child->sibling != NULL)
2584  fprintf(f, " C2:%s", stid(t->child->sibling, idbuf, sizeof(idbuf)));
2585  if (t->sibling != NULL)
2586  fprintf(f, " S:%s", stid(t->sibling, idbuf, sizeof(idbuf)));
2587  if (!NULLCNFA(t->cnfa))
2588  {
2589  fprintf(f, "\n");
2590  dumpcnfa(&t->cnfa, f);
2591  }
2592  fprintf(f, "\n");
2593  for (t2 = t->child; t2 != NULL; t2 = t2->sibling)
2594  stdump(t2, f, nfapresent);
2595 }
2596 
2597 /*
2598  * stid - identify a subtree node for dumping
2599  */
2600 static const char * /* points to buf or constant string */
2601 stid(struct subre *t,
2602  char *buf,
2603  size_t bufsize)
2604 {
2605  /* big enough for hex int or decimal t->id? */
2606  if (bufsize < sizeof(void *) * 2 + 3 || bufsize < sizeof(t->id) * 3 + 1)
2607  return "unable";
2608  if (t->id != 0)
2609  sprintf(buf, "%d", t->id);
2610  else
2611  sprintf(buf, "%p", t);
2612  return buf;
2613 }
2614 #endif /* REG_DEBUG */
2615 
2616 
2617 #include "regc_lex.c"
2618 #include "regc_color.c"
2619 #include "regc_nfa.c"
2620 #include "regc_cvec.c"
2621 #include "regc_pg_locale.c"
2622 #include "regc_locale.c"
REG_USHORTEST
#define REG_USHORTEST
Definition: regex.h:75
newcolor
static color newcolor(struct colormap *)
regc_locale.c
EAT
#define EAT(t)
Definition: regcomp.c:271
subcolorcvec
static void subcolorcvec(struct vars *, struct cvec *, struct state *, struct state *)
RANGE
#define RANGE
Definition: regcomp.c:296
scannum
static int scannum(struct vars *)
Definition: regcomp.c:1511
PAIR
#define PAIR(x, y)
REG_ESUBREG
#define REG_ESUBREG
Definition: regex.h:145
isconstraintarc
static int isconstraintarc(struct arc *)
newline
static chr newline(void)
changearcsource
static void changearcsource(struct arc *, struct state *)
cloneouts
static void cloneouts(struct nfa *, struct state *, struct state *, struct state *, int)
vars::nexttype
int nexttype
Definition: regcomp.c:245
pg_wc_islower
static int pg_wc_islower(pg_wchar c)
vars::treefree
struct subre * treefree
Definition: regcomp.c:258
state::no
int no
Definition: regguts.h:319
sortouts
static void sortouts(struct nfa *, struct state *)
REG_NLSTOP
#define REG_NLSTOP
Definition: regex.h:111
BRUSE
#define BRUSE
Definition: regguts.h:480
cparc
static void cparc(struct nfa *, struct arc *, struct state *, struct state *)
lexescape
static int lexescape(struct vars *)
arc::from
struct state * from
Definition: regguts.h:294
END
#define END
Definition: regcomp.c:293
regex_t::re_fns
char * re_fns
Definition: regex.h:81
pg_wc_isgraph
static int pg_wc_isgraph(pg_wchar c)
okcolors
static void okcolors(struct nfa *, struct colormap *)
CCLASS
#define CCLASS
Definition: regcomp.c:292
changearctarget
static void changearctarget(struct arc *, struct state *)
arc::type
int type
Definition: regguts.h:292
QueryCancelPending
volatile sig_atomic_t QueryCancelPending
Definition: globals.c:31
subre::child
struct subre * child
Definition: regguts.h:496
freelacons
static void freelacons(struct subre *, int)
Definition: regcomp.c:2385
numst
static int numst(struct subre *, int)
Definition: regcomp.c:2220
optimize
static long optimize(struct nfa *, FILE *)
vars::ntree
int ntree
Definition: regcomp.c:259
debug
static bool debug
Definition: initdb.c:140
vars::nextvalue
chr nextvalue
Definition: regcomp.c:246
subre::capno
int capno
Definition: regguts.h:492
rfree
static void rfree(regex_t *)
Definition: regcomp.c:2402
DUPMAX
#define DUPMAX
Definition: regguts.h:93
brenext
static int brenext(struct vars *, chr)
charclass
static void charclass(struct vars *, enum char_classes, struct state *, struct state *)
Definition: regcomp.c:1450
REG_EPAREN
#define REG_EPAREN
Definition: regex.h:147
guts::lacons
struct subre * lacons
Definition: regguts.h:539
NOERRN
#define NOERRN()
Definition: regcomp.c:278
element
static chr element(struct vars *, const chr *, const chr *)
rcancelrequested
static int rcancelrequested(void)
Definition: regcomp.c:2438
bracket
static void bracket(struct vars *, struct state *, struct state *)
Definition: regcomp.c:1629
guts::tree
struct subre * tree
Definition: regguts.h:534
nfa::final
struct state * final
Definition: regguts.h:347
nfatree
static long nfatree(struct vars *, struct subre *, FILE *)
Definition: regcomp.c:2287
brackpart
static void brackpart(struct vars *, struct state *, struct state *, bool *)
Definition: regcomp.c:1719
vars::treechain
struct subre * treechain
Definition: regcomp.c:257
lexdigits
static chr lexdigits(struct vars *, int, int, int)
REDUCE
#define REDUCE(x)
freecm
static void freecm(struct colormap *)
nonword
static void nonword(struct vars *, int, struct state *, struct state *)
Definition: regcomp.c:1414
mergeins
static void mergeins(struct nfa *, struct state *, struct arc **, int)
pg_wc_isspace
static int pg_wc_isspace(pg_wchar c)
REG_ESPACE
#define REG_ESPACE
Definition: regex.h:151
cclass_column_index
static int cclass_column_index(struct colormap *, chr)
freev
static int freev(struct vars *, int)
Definition: regcomp.c:548
arc
Definition: regguts.h:290
carcsort
static void carcsort(struct carc *, size_t)
specialcolors
static void specialcolors(struct nfa *)
RAINBOW
#define RAINBOW
Definition: regguts.h:154
REG_QUOTE
#define REG_QUOTE
Definition: regex.h:106
prefixes
static void prefixes(struct vars *)
NEXT
#define NEXT()
Definition: regcomp.c:269
NULLCNFA
#define NULLCNFA(cnfa)
Definition: regguts.h:431
MESSY
#define MESSY(f)
Definition: regguts.h:486
markreachable
static void markreachable(struct nfa *, struct state *, struct state *, struct state *)
LATYPE_BEHIND_POS
#define LATYPE_BEHIND_POS
Definition: regguts.h:101
newcvec
static struct cvec * newcvec(int, int)
getcvec
static struct cvec * getcvec(struct vars *, int, int)
cnfa
Definition: regguts.h:401
color
short color
Definition: regguts.h:150
colorchain
static void colorchain(struct colormap *, struct arc *)
state::nins
int nins
Definition: regguts.h:322
fns
Definition: regguts.h:510
vars::nlcolor
color nlcolor
Definition: regcomp.c:254
regc_color.c
subre::op
char op
Definition: regguts.h:473
range
static struct cvec * range(struct vars *, chr, chr, int)
fixempties
static void fixempties(struct nfa *, FILE *)
pg_wc_isword
static int pg_wc_isword(pg_wchar c)
guts::nlacons
int nlacons
Definition: regguts.h:540
eclass
static struct cvec * eclass(struct vars *, chr, int)
subre
static struct subre * subre(struct vars *, int, int, struct state *, struct state *)
Definition: regcomp.c:2051
pushfwd
static void pushfwd(struct nfa *, FILE *)
hasconstraintout
static int hasconstraintout(struct state *)
vars::lasttype
int lasttype
Definition: regcomp.c:244
check_in_colors_match
static bool check_in_colors_match(struct state *, color, color)
regc_cvec.c
allocarc
static struct arc * allocarc(struct nfa *)
emptyreachable
static struct state * emptyreachable(struct nfa *, struct state *, struct state *, struct arc **)
subre::min
short min
Definition: regguts.h:494
REMAGIC
#define REMAGIC
Definition: regguts.h:96
nfa::flags
int flags
Definition: regguts.h:361
onechr
static void onechr(struct vars *, chr, struct state *, struct state *)
Definition: regcomp.c:1867
subcolor
static color subcolor(struct colormap *, chr)
FREE
#define FREE(ptr)
Definition: cryptohash.c:37
wordchrs
static void wordchrs(struct vars *)
Definition: regcomp.c:1949
subre::begin
struct state * begin
Definition: regguts.h:498
generate_unaccent_rules.type
type
Definition: generate_unaccent_rules.py:282
COMBINE
#define COMBINE(f1, f2)
Definition: regguts.h:489
REG_ULOCALE
#define REG_ULOCALE
Definition: regex.h:72
nfa
Definition: regguts.h:343
hasnonemptyout
static int hasnonemptyout(struct state *)
LATYPE_AHEAD_NEG
#define LATYPE_AHEAD_NEG
Definition: regguts.h:100
regc_lex.c
Oid
unsigned int Oid
Definition: postgres_ext.h:31
ISERR
#define ISERR()
Definition: regcomp.c:273
subcoloronechr
static void subcoloronechr(struct vars *, chr, struct state *, struct state *, color *)
subre::latype
char latype
Definition: regguts.h:490
fprintf
#define fprintf
Definition: port.h:220
BEHIND
#define BEHIND
Definition: regcomp.c:299
REG_ICASE
#define REG_ICASE
Definition: regex.h:108
colormap::cd
struct colordesc * cd
Definition: regguts.h:231
regex_t::re_csize
int re_csize
Definition: regex.h:76
makesearch
static void makesearch(struct vars *, struct nfa *)
Definition: regcomp.c:577
pg_regcomp
int pg_regcomp(regex_t *re, const chr *string, size_t len, int flags, Oid collation)
Definition: regcomp.c:328
sortouts_cmp
static int sortouts_cmp(const void *, const void *)
dupnfa
static void dupnfa(struct nfa *, struct state *, struct state *, struct state *, struct state *)
NOTREACHED
#define NOTREACHED
Definition: regguts.h:91
vars::nsubexp
int nsubexp
Definition: regcomp.c:248
LATYPE_AHEAD_POS
#define LATYPE_AHEAD_POS
Definition: regguts.h:99
vars::start
chr * start
Definition: regexec.c:114
MALLOC
#define MALLOC(n)
Definition: regcustom.h:60
SOME
#define SOME
single_color_transition
static struct state * single_color_transition(struct state *, struct state *)
REG_PROGRESS
#define REG_PROGRESS
Definition: regex.h:119
ERR
#define ERR(e)
Definition: regcomp.c:276
subre::chain
struct subre * chain
Definition: regguts.h:501
nfa::maxmatchall
int maxmatchall
Definition: regguts.h:363
subre::id
int id
Definition: regguts.h:491
NUM_CCLASSES
#define NUM_CCLASSES
Definition: regguts.h:139
nfa::v
struct vars * v
Definition: regguts.h:364
regex_t::re_magic
int re_magic
Definition: regex.h:57
addchr
static void addchr(struct cvec *, chr)
sprintf
#define sprintf
Definition: port.h:218
guts::search
struct cnfa search
Definition: regguts.h:535
push
static int push(struct nfa *, struct arc *, struct state **)
newhicolorcols
static void newhicolorcols(struct colormap *)
chr
pg_wchar chr
Definition: regcustom.h:66
CCLASSS
#define CCLASSS
Definition: regcomp.c:294
REALLOC
#define REALLOC(p, n)
Definition: regcustom.h:62
regex_t::re_nsub
size_t re_nsub
Definition: regex.h:58
freesrnode
static void freesrnode(struct vars *, struct subre *)
Definition: regcomp.c:2143
duptraverse
static void duptraverse(struct nfa *, struct state *, struct state *)
vars::cm
struct colormap * cm
Definition: regcomp.c:253
ZAPCNFA
#define ZAPCNFA(cnfa)
Definition: regguts.h:429
dumpnfa
static void dumpnfa(struct nfa *, FILE *)
newhicolorrow
static int newhicolorrow(struct colormap *, int)
s1
char * s1
Definition: preproc-strings.c:33
rainbow
static void rainbow(struct nfa *, struct colormap *, int, color, struct state *, struct state *)
LACON
#define LACON
Definition: regcomp.c:297
checkmatchall
static void checkmatchall(struct nfa *)
vars::re
regex_t * re
Definition: regcomp.c:239
vars::nlacons
int nlacons
Definition: regcomp.c:263
subre::sibling
struct subre * sibling
Definition: regguts.h:497
removeconstraints
static void removeconstraints(struct nfa *, struct state *, struct state *)
COLMARK
#define COLMARK
Definition: regguts.h:182
REG_BADBR
#define REG_BADBR
Definition: regex.h:149
guts::magic
int magic
Definition: regguts.h:529
uncolorchain
static void uncolorchain(struct colormap *, struct arc *)
cclasscvec
static struct cvec * cclasscvec(struct vars *, enum char_classes, int)
clonesuccessorstates
static void clonesuccessorstates(struct nfa *, struct state *, struct state *, struct state *, struct arc *, char *, char *, int)
c
char * c
Definition: preproc-cursor.c:31
REG_INVARG
#define REG_INVARG
Definition: regex.h:154
buf
static char * buf
Definition: pg_test_fsync.c:68
markst
static void markst(struct subre *)
Definition: regcomp.c:2253
fixconstraintloops
static void fixconstraintloops(struct nfa *, FILE *)
freesubre
static void freesubre(struct vars *, struct subre *)
Definition: regcomp.c:2108
REG_BADRPT
#define REG_BADRPT
Definition: regex.h:152
processlacon
static void processlacon(struct vars *, struct state *, struct state *, int, struct state *, struct state *)
Definition: regcomp.c:1985
analyze
static long analyze(struct nfa *)
next
static int next(struct vars *)
arc::outchain
struct arc * outchain
Definition: regguts.h:296
flag
char * flag(int b)
Definition: test-ctype.c:33
subre::flags
char flags
Definition: regguts.h:474
vars::subs
struct subre ** subs
Definition: regcomp.c:249
newnfa
static struct nfa * newnfa(struct vars *, struct colormap *, struct nfa *)
string
char string[11]
Definition: preproc-type.c:46
nfa::bos
color bos[2]
Definition: regguts.h:359
pg_wc_isupper
static int pg_wc_isupper(pg_wchar c)
guts::cmap
struct colormap cmap
Definition: regguts.h:537
assert
#define assert(TEST)
Definition: imath.c:73
freecolor
static void freecolor(struct colormap *, color)
LATYPE_IS_AHEAD
#define LATYPE_IS_AHEAD(la)
Definition: regguts.h:104
moveins
static void moveins(struct nfa *, struct state *, struct state *)
freesubreandsiblings
static void freesubreandsiblings(struct vars *, struct subre *)
Definition: regcomp.c:2127
pg_wc_tolower
static pg_wchar pg_wc_tolower(pg_wchar c)
state::outs
struct arc * outs
Definition: regguts.h:325
REG_NEWLINE
#define REG_NEWLINE
Definition: regex.h:113
moveouts
static void moveouts(struct nfa *, struct state *, struct state *)
UNUSEDCOLOR
#define UNUSEDCOLOR(cd)
Definition: regguts.h:185
scanplain
static const chr * scanplain(struct vars *)
Definition: regcomp.c:1842
REG_ADVANCED
#define REG_ADVANCED
Definition: regex.h:105
SEE
#define SEE(t)
Definition: regcomp.c:270
findconstraintloop
static int findconstraintloop(struct nfa *, struct state *)
init
#define init()
REG_ECOLLATE
#define REG_ECOLLATE
Definition: regex.h:142
pg_wc_isdigit
static int pg_wc_isdigit(pg_wchar c)
vars::nsubs
size_t nsubs
Definition: regcomp.c:250
clearcvec
static struct cvec * clearcvec(struct cvec *)
sortins
static void sortins(struct nfa *, struct state *)
allcases
static struct cvec * allcases(struct vars *, chr)
pg_wchar
unsigned int pg_wchar
Definition: mbprint.c:31
newstate
static struct state * newstate(struct nfa *)
SBEGIN
#define SBEGIN
Definition: regcomp.c:302
delsub
static void delsub(struct nfa *, struct state *, struct state *)
vars::g
struct guts * g
Definition: regexec.c:109
BACKREF
#define BACKREF
Definition: regcomp.c:289
MATCHALL
#define MATCHALL
Definition: regguts.h:407
copyouts
static void copyouts(struct nfa *, struct state *, struct state *)
state::tmp
struct state * tmp
Definition: regguts.h:326
cvec
Definition: regguts.h:273
vars::err
int err
Definition: regcomp.c:242
newfstate
static struct state * newfstate(struct nfa *, int flag)
copyins
static void copyins(struct nfa *, struct state *, struct state *)
LATYPE_BEHIND_NEG
#define LATYPE_BEHIND_NEG
Definition: regguts.h:102
nfanode
static long nfanode(struct vars *, struct subre *, int, FILE *)
Definition: regcomp.c:2307
pg_wc_isalpha
static int pg_wc_isalpha(pg_wchar c)
CCLASSC
#define CCLASSC
Definition: regcomp.c:295
REG_EXTENDED
#define REG_EXTENDED
Definition: regex.h:103
vars::nfa
struct nfa * nfa
Definition: regcomp.c:252
PREF
#define PREF(f)
Definition: regguts.h:487
vars::cv
struct cvec * cv
Definition: regcomp.c:260
subre::backno
int backno
Definition: regguts.h:493
subcolorhi
static color subcolorhi(struct colormap *, color *)
freestate
static void freestate(struct nfa *, struct state *)
CDEND
#define CDEND(cm)
Definition: regguts.h:232
pull
static int pull(struct nfa *, struct arc *, struct state **)
arc::to
struct state * to
Definition: regguts.h:295
s2
char * s2
Definition: preproc-strings.c:33
vars::cv2
struct cvec * cv2
Definition: regcomp.c:261
chrnamed
static chr chrnamed(struct vars *, const chr *, const chr *, chr)
char_classes
char_classes
Definition: regguts.h:133
REG_UUNPORT
#define REG_UUNPORT
Definition: regex.h:71
REG_ADVF
#define REG_ADVF
Definition: regex.h:104
PLAIN
#define PLAIN
Definition: regcomp.c:287
EMPTYARC
#define EMPTYARC(x, y)
Definition: regcomp.c:282
vars::wordchrs
struct state * wordchrs
Definition: regcomp.c:255
BACKR
#define BACKR
Definition: regguts.h:479
regex_t::re_info
long re_info
Definition: regex.h:59
parsebranch
static struct subre * parsebranch(struct vars *, int, int, struct state *, struct state *, int)
Definition: regcomp.c:741
REG_DUMP
#define REG_DUMP
Definition: regex.h:117
guts
Definition: regguts.h:527
guts::ntree
int ntree
Definition: regguts.h:536
cleanup
static void cleanup(struct nfa *)
newsub
static color newsub(struct colormap *, color)
rstacktoodeep
static int rstacktoodeep(void)
Definition: regcomp.c:2454
createarc
static void createarc(struct nfa *, int, color, struct state *, struct state *)
EOS
#define EOS
Definition: regcomp.c:286
REG_ECTYPE
#define REG_ECTYPE
Definition: regex.h:143
cbracket
static void cbracket(struct vars *, struct state *, struct state *)
Definition: regcomp.c:1685
arc::co
color co
Definition: regguts.h:293
NWBDRY
#define NWBDRY
Definition: regcomp.c:301
DUPINF
#define DUPINF
Definition: regguts.h:94
REG_ASSERT
#define REG_ASSERT
Definition: regex.h:153
MIXED
#define MIXED
Definition: regguts.h:477
deltraverse
static void deltraverse(struct nfa *, struct state *, struct state *)
GUTSMAGIC
#define GUTSMAGIC
Definition: regguts.h:530
removetraverse
static void removetraverse(struct nfa *, struct state *)
REG_UUNSPEC
#define REG_UUNSPEC
Definition: regex.h:69
ProcDiePending
volatile sig_atomic_t ProcDiePending
Definition: globals.c:32
pg_set_regex_collation
void pg_set_regex_collation(Oid collation)
Definition: regc_pg_locale.c:232
state
Definition: regguts.h:317
skip
static void skip(struct vars *)
colordesc::flags
int flags
Definition: regguts.h:179
subre::max
short max
Definition: regguts.h:495
newarc
static void newarc(struct nfa *, int, color, struct state *, struct state *)
carc_cmp
static int carc_cmp(const void *, const void *)
pg_wc_toupper
static pg_wchar pg_wc_toupper(pg_wchar c)
parseqatom
static struct subre * parseqatom(struct vars *, int, int, struct state *, struct state *, struct subre *)
Definition: regcomp.c:794
REG_ERANGE
#define REG_ERANGE
Definition: regex.h:150
pg_wc_isalnum
static int pg_wc_isalnum(pg_wchar c)
vars::now
const chr * now
Definition: regcomp.c:240
REG_NLANCH
#define REG_NLANCH
Definition: regex.h:112
REG_ETOOBIG
#define REG_ETOOBIG
Definition: regex.h:157
functions
static const struct fns functions
Definition: regcomp.c:313
subcoloronerange
static void subcoloronerange(struct vars *, chr, chr, struct state *, struct state *, color *)
InterruptPending
volatile sig_atomic_t InterruptPending
Definition: globals.c:30
COLLEL
#define COLLEL
Definition: regcomp.c:290
REG_NOSUB
#define REG_NOSUB
Definition: regex.h:109
sortins_cmp
static int sortins_cmp(const void *, const void *)
VS
#define VS(x)
Definition: regguts.h:61
cmp
static int cmp(const chr *, const chr *, size_t)
subre::end
struct state * end
Definition: regguts.h:499
initcm
static void initcm(struct vars *, struct colormap *)
subcoloronerow
static void subcoloronerow(struct vars *, int, struct state *, struct state *, color *)
INUSE
#define INUSE
Definition: regguts.h:481
guts::info
long info
Definition: regguts.h:532
subre
Definition: regguts.h:471
NOTE
#define NOTE(b)
Definition: regcomp.c:281
NOERRZ
#define NOERRZ()
Definition: regcomp.c:279
vars::lexcon
int lexcon
Definition: regcomp.c:247
subre::cnfa
struct cnfa cnfa
Definition: regguts.h:500
CNOERR
#define CNOERR()
LONGER
#define LONGER
Definition: regguts.h:475
pullback
static void pullback(struct nfa *, FILE *)
generate_unaccent_rules.stdout
stdout
Definition: generate_unaccent_rules.py:44
repeat
static void repeat(struct vars *, struct state *, struct state *, int, int)
Definition: regcomp.c:1542
charclasscomplement
static void charclasscomplement(struct vars *, enum char_classes, struct state *, struct state *)
Definition: regcomp.c:1474
word
static void word(struct vars *, int, struct state *, struct state *)
Definition: regcomp.c:1432
freecvec
static void freecvec(struct cvec *)
vars::stop
const chr * stop
Definition: regcomp.c:241
regex_t::re_guts
char * re_guts
Definition: regex.h:80
optimizebracket
static void optimizebracket(struct vars *, struct state *, struct state *)
Definition: regcomp.c:1893
state::nouts
int nouts
Definition: regguts.h:323
CAP
#define CAP
Definition: regguts.h:478
pg_wc_isprint
static int pg_wc_isprint(pg_wchar c)
findarc
static struct arc * findarc(struct state *, int, color)
guts::cflags
int cflags
Definition: regguts.h:531
before
static int before(chr, chr)
PSEUDO
#define PSEUDO
Definition: regguts.h:181
addrange
static void addrange(struct cvec *, chr, chr)
NOERR
#define NOERR()
Definition: regcomp.c:277
UP
#define UP(f)
Definition: regguts.h:485
nfa::init
struct state * init
Definition: regguts.h:346
SEND
#define SEND
Definition: regcomp.c:303
regc_nfa.c
vars::cflags
int cflags
Definition: regcomp.c:243
guts::nsub
size_t nsub
Definition: regguts.h:533
arc::inchain
struct arc * inchain
Definition: regguts.h:299
lexstart
static void lexstart(struct vars *)
casecmp
static int casecmp(const chr *, const chr *, size_t)
ARCV
#define ARCV(t, val)
pseudocolor
static color pseudocolor(struct colormap *)
SHORTER
#define SHORTER
Definition: regguts.h:476
i
int i
Definition: preproc-comment.c:23
vars::sub10
struct subre * sub10[10]
Definition: regcomp.c:251
lookupcclass
static enum char_classes lookupcclass(struct vars *, const chr *, const chr *)
COLORLESS
#define COLORLESS
Definition: regguts.h:153
REG_EXPANDED
#define REG_EXPANDED
Definition: regex.h:110
DISCARD
#define DISCARD
Definition: regguts.h:58
freearc
static void freearc(struct nfa *, struct arc *)
freenfa
static void freenfa(struct nfa *)
vars::tree
struct subre * tree
Definition: regcomp.c:256
maxcolor
static color maxcolor(struct colormap *)
WBDRY
#define WBDRY
Definition: regcomp.c:300
cleanst
static void cleanst(struct vars *)
Definition: regcomp.c:2268
dropstate
static void dropstate(struct nfa *, struct state *)
INF
#define INF
removecaptures
static void removecaptures(struct vars *, struct subre *)
Definition: regcomp.c:2174
vars::spaceused
size_t spaceused
Definition: regcomp.c:265
INSIST
#define INSIST(c, e)
Definition: regcomp.c:280
check_out_colors_match
static bool check_out_colors_match(struct state *, color, color)
vars::lacons
struct subre * lacons
Definition: regcomp.c:262
freecnfa
static void freecnfa(struct cnfa *)
pg_wc_ispunct
static int pg_wc_ispunct(pg_wchar c)
breakconstraintloop
static void breakconstraintloop(struct nfa *, struct state *)
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Definition: regcomp.c:237
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Oid re_collation
Definition: regex.h:78
compact
static void compact(struct nfa *, struct cnfa *)
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Definition: regex.h:55
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static void moresubs(struct vars *, int)
Definition: regcomp.c:511
cleartraverse
static void cleartraverse(struct nfa *, struct state *)
STACK_TOO_DEEP
#define STACK_TOO_DEEP(re)
Definition: regguts.h:520
DIGIT
#define DIGIT
Definition: regcomp.c:288
AHEAD
#define AHEAD
Definition: regcomp.c:298
state::ins
struct arc * ins
Definition: regguts.h:324
newlacon
static int newlacon(struct vars *, struct state *, struct state *, int)
Definition: regcomp.c:2346
regc_pg_locale.c
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struct state * pre
Definition: regguts.h:345
markcanreach
static void markcanreach(struct nfa *, struct state *, struct state *, struct state *)
parse
static struct subre * parse(struct vars *, int, int, struct state *, struct state *)
Definition: regcomp.c:673
stack_is_too_deep
bool stack_is_too_deep(void)
Definition: postgres.c:3483
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static int combine(struct nfa *nfa, struct arc *con, struct arc *a)
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static void colorcomplement(struct nfa *, struct colormap *, int, struct state *, struct state *, struct state *)
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Definition: regguts.h:395
checkmatchall_recurse
static bool checkmatchall_recurse(struct nfa *, struct state *, bool **)
ECLASS
#define ECLASS
Definition: regcomp.c:291
REG_UPBOTCH
#define REG_UPBOTCH
Definition: regex.h:65