mirror of
https://github.com/postgres/postgres.git
synced 2025-04-29 13:56:47 +03:00
3694b4d7e1
When the number of allowed iterations is limited (either a "?" quantifier or a bound expression), the last sub-match has to reach to the end of the target string. The previous coding here first tried the shortest possible match (one character, usually) and then gave up and back-tracked if that didn't work, typically leading to failure to match overall, as shown in bug #11478 from Christoph Berg. The minimum change to fix that would be to not decrement k before "goto backtrack"; but that would be a pretty stupid solution, because we'd laboriously try each possible sub-match length before finally discovering that only ending at the end can work. Instead, force the sub-match endpoint limit up to the end for even the first shortest() call if we cannot have any more sub-matches after this one. Bug introduced in my rewrite that added the iterdissect logic, commit 173e29aa5deefd9e71c183583ba37805c8102a72. The shortest-first search code was too closely modeled on the longest-first code, which hasn't got this issue since it tries a match reaching to the end to start with anyway. Back-patch to all affected branches.
1292 lines
33 KiB
C
1292 lines
33 KiB
C
/*
|
|
* re_*exec and friends - match REs
|
|
*
|
|
* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
|
|
*
|
|
* Development of this software was funded, in part, by Cray Research Inc.,
|
|
* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
|
|
* Corporation, none of whom are responsible for the results. The author
|
|
* thanks all of them.
|
|
*
|
|
* Redistribution and use in source and binary forms -- with or without
|
|
* modification -- are permitted for any purpose, provided that
|
|
* redistributions in source form retain this entire copyright notice and
|
|
* indicate the origin and nature of any modifications.
|
|
*
|
|
* I'd appreciate being given credit for this package in the documentation
|
|
* of software which uses it, but that is not a requirement.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* src/backend/regex/regexec.c
|
|
*
|
|
*/
|
|
|
|
#include "regex/regguts.h"
|
|
|
|
|
|
|
|
/* lazy-DFA representation */
|
|
struct arcp
|
|
{ /* "pointer" to an outarc */
|
|
struct sset *ss;
|
|
color co;
|
|
};
|
|
|
|
struct sset
|
|
{ /* state set */
|
|
unsigned *states; /* pointer to bitvector */
|
|
unsigned hash; /* hash of bitvector */
|
|
#define HASH(bv, nw) (((nw) == 1) ? *(bv) : hash(bv, nw))
|
|
#define HIT(h,bv,ss,nw) ((ss)->hash == (h) && ((nw) == 1 || \
|
|
memcmp(VS(bv), VS((ss)->states), (nw)*sizeof(unsigned)) == 0))
|
|
int flags;
|
|
#define STARTER 01 /* the initial state set */
|
|
#define POSTSTATE 02 /* includes the goal state */
|
|
#define LOCKED 04 /* locked in cache */
|
|
#define NOPROGRESS 010 /* zero-progress state set */
|
|
struct arcp ins; /* chain of inarcs pointing here */
|
|
chr *lastseen; /* last entered on arrival here */
|
|
struct sset **outs; /* outarc vector indexed by color */
|
|
struct arcp *inchain; /* chain-pointer vector for outarcs */
|
|
};
|
|
|
|
struct dfa
|
|
{
|
|
int nssets; /* size of cache */
|
|
int nssused; /* how many entries occupied yet */
|
|
int nstates; /* number of states */
|
|
int ncolors; /* length of outarc and inchain vectors */
|
|
int wordsper; /* length of state-set bitvectors */
|
|
struct sset *ssets; /* state-set cache */
|
|
unsigned *statesarea; /* bitvector storage */
|
|
unsigned *work; /* pointer to work area within statesarea */
|
|
struct sset **outsarea; /* outarc-vector storage */
|
|
struct arcp *incarea; /* inchain storage */
|
|
struct cnfa *cnfa;
|
|
struct colormap *cm;
|
|
chr *lastpost; /* location of last cache-flushed success */
|
|
chr *lastnopr; /* location of last cache-flushed NOPROGRESS */
|
|
struct sset *search; /* replacement-search-pointer memory */
|
|
int cptsmalloced; /* were the areas individually malloced? */
|
|
char *mallocarea; /* self, or master malloced area, or NULL */
|
|
};
|
|
|
|
#define WORK 1 /* number of work bitvectors needed */
|
|
|
|
/* setup for non-malloc allocation for small cases */
|
|
#define FEWSTATES 20 /* must be less than UBITS */
|
|
#define FEWCOLORS 15
|
|
struct smalldfa
|
|
{
|
|
struct dfa dfa;
|
|
struct sset ssets[FEWSTATES * 2];
|
|
unsigned statesarea[FEWSTATES * 2 + WORK];
|
|
struct sset *outsarea[FEWSTATES * 2 * FEWCOLORS];
|
|
struct arcp incarea[FEWSTATES * 2 * FEWCOLORS];
|
|
};
|
|
|
|
#define DOMALLOC ((struct smalldfa *)NULL) /* force malloc */
|
|
|
|
|
|
|
|
/* internal variables, bundled for easy passing around */
|
|
struct vars
|
|
{
|
|
regex_t *re;
|
|
struct guts *g;
|
|
int eflags; /* copies of arguments */
|
|
size_t nmatch;
|
|
regmatch_t *pmatch;
|
|
rm_detail_t *details;
|
|
chr *start; /* start of string */
|
|
chr *search_start; /* search start of string */
|
|
chr *stop; /* just past end of string */
|
|
int err; /* error code if any (0 none) */
|
|
struct dfa **subdfas; /* per-subre DFAs */
|
|
struct smalldfa dfa1;
|
|
struct smalldfa dfa2;
|
|
};
|
|
|
|
#define VISERR(vv) ((vv)->err != 0) /* have we seen an error yet? */
|
|
#define ISERR() VISERR(v)
|
|
#define VERR(vv,e) ((vv)->err = ((vv)->err ? (vv)->err : (e)))
|
|
#define ERR(e) VERR(v, e) /* record an error */
|
|
#define NOERR() {if (ISERR()) return v->err;} /* if error seen, return it */
|
|
#define OFF(p) ((p) - v->start)
|
|
#define LOFF(p) ((long)OFF(p))
|
|
|
|
|
|
|
|
/*
|
|
* forward declarations
|
|
*/
|
|
/* === regexec.c === */
|
|
static struct dfa *getsubdfa(struct vars *, struct subre *);
|
|
static int find(struct vars *, struct cnfa *, struct colormap *);
|
|
static int cfind(struct vars *, struct cnfa *, struct colormap *);
|
|
static int cfindloop(struct vars *, struct cnfa *, struct colormap *, struct dfa *, struct dfa *, chr **);
|
|
static void zapallsubs(regmatch_t *, size_t);
|
|
static void zaptreesubs(struct vars *, struct subre *);
|
|
static void subset(struct vars *, struct subre *, chr *, chr *);
|
|
static int cdissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int ccondissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int crevcondissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int cbrdissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int caltdissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int citerdissect(struct vars *, struct subre *, chr *, chr *);
|
|
static int creviterdissect(struct vars *, struct subre *, chr *, chr *);
|
|
|
|
/* === rege_dfa.c === */
|
|
static chr *longest(struct vars *, struct dfa *, chr *, chr *, int *);
|
|
static chr *shortest(struct vars *, struct dfa *, chr *, chr *, chr *, chr **, int *);
|
|
static chr *lastcold(struct vars *, struct dfa *);
|
|
static struct dfa *newdfa(struct vars *, struct cnfa *, struct colormap *, struct smalldfa *);
|
|
static void freedfa(struct dfa *);
|
|
static unsigned hash(unsigned *, int);
|
|
static struct sset *initialize(struct vars *, struct dfa *, chr *);
|
|
static struct sset *miss(struct vars *, struct dfa *, struct sset *, pcolor, chr *, chr *);
|
|
static int lacon(struct vars *, struct cnfa *, chr *, pcolor);
|
|
static struct sset *getvacant(struct vars *, struct dfa *, chr *, chr *);
|
|
static struct sset *pickss(struct vars *, struct dfa *, chr *, chr *);
|
|
|
|
|
|
/*
|
|
* pg_regexec - match regular expression
|
|
*/
|
|
int
|
|
pg_regexec(regex_t *re,
|
|
const chr *string,
|
|
size_t len,
|
|
size_t search_start,
|
|
rm_detail_t *details,
|
|
size_t nmatch,
|
|
regmatch_t pmatch[],
|
|
int flags)
|
|
{
|
|
struct vars var;
|
|
register struct vars *v = &var;
|
|
int st;
|
|
size_t n;
|
|
size_t i;
|
|
int backref;
|
|
|
|
#define LOCALMAT 20
|
|
regmatch_t mat[LOCALMAT];
|
|
|
|
#define LOCALDFAS 40
|
|
struct dfa *subdfas[LOCALDFAS];
|
|
|
|
/* sanity checks */
|
|
if (re == NULL || string == NULL || re->re_magic != REMAGIC)
|
|
return REG_INVARG;
|
|
if (re->re_csize != sizeof(chr))
|
|
return REG_MIXED;
|
|
|
|
/* Initialize locale-dependent support */
|
|
pg_set_regex_collation(re->re_collation);
|
|
|
|
/* setup */
|
|
v->re = re;
|
|
v->g = (struct guts *) re->re_guts;
|
|
if ((v->g->cflags & REG_EXPECT) && details == NULL)
|
|
return REG_INVARG;
|
|
if (v->g->info & REG_UIMPOSSIBLE)
|
|
return REG_NOMATCH;
|
|
backref = (v->g->info & REG_UBACKREF) ? 1 : 0;
|
|
v->eflags = flags;
|
|
if (v->g->cflags & REG_NOSUB)
|
|
nmatch = 0; /* override client */
|
|
v->nmatch = nmatch;
|
|
if (backref)
|
|
{
|
|
/* need work area */
|
|
if (v->g->nsub + 1 <= LOCALMAT)
|
|
v->pmatch = mat;
|
|
else
|
|
v->pmatch = (regmatch_t *) MALLOC((v->g->nsub + 1) *
|
|
sizeof(regmatch_t));
|
|
if (v->pmatch == NULL)
|
|
return REG_ESPACE;
|
|
v->nmatch = v->g->nsub + 1;
|
|
}
|
|
else
|
|
v->pmatch = pmatch;
|
|
v->details = details;
|
|
v->start = (chr *) string;
|
|
v->search_start = (chr *) string + search_start;
|
|
v->stop = (chr *) string + len;
|
|
v->err = 0;
|
|
assert(v->g->ntree >= 0);
|
|
n = (size_t) v->g->ntree;
|
|
if (n <= LOCALDFAS)
|
|
v->subdfas = subdfas;
|
|
else
|
|
v->subdfas = (struct dfa **) MALLOC(n * sizeof(struct dfa *));
|
|
if (v->subdfas == NULL)
|
|
{
|
|
if (v->pmatch != pmatch && v->pmatch != mat)
|
|
FREE(v->pmatch);
|
|
return REG_ESPACE;
|
|
}
|
|
for (i = 0; i < n; i++)
|
|
v->subdfas[i] = NULL;
|
|
|
|
/* do it */
|
|
assert(v->g->tree != NULL);
|
|
if (backref)
|
|
st = cfind(v, &v->g->tree->cnfa, &v->g->cmap);
|
|
else
|
|
st = find(v, &v->g->tree->cnfa, &v->g->cmap);
|
|
|
|
/* copy (portion of) match vector over if necessary */
|
|
if (st == REG_OKAY && v->pmatch != pmatch && nmatch > 0)
|
|
{
|
|
zapallsubs(pmatch, nmatch);
|
|
n = (nmatch < v->nmatch) ? nmatch : v->nmatch;
|
|
memcpy(VS(pmatch), VS(v->pmatch), n * sizeof(regmatch_t));
|
|
}
|
|
|
|
/* clean up */
|
|
if (v->pmatch != pmatch && v->pmatch != mat)
|
|
FREE(v->pmatch);
|
|
n = (size_t) v->g->ntree;
|
|
for (i = 0; i < n; i++)
|
|
{
|
|
if (v->subdfas[i] != NULL)
|
|
freedfa(v->subdfas[i]);
|
|
}
|
|
if (v->subdfas != subdfas)
|
|
FREE(v->subdfas);
|
|
|
|
return st;
|
|
}
|
|
|
|
/*
|
|
* getsubdfa - create or re-fetch the DFA for a subre node
|
|
*
|
|
* We only need to create the DFA once per overall regex execution.
|
|
* The DFA will be freed by the cleanup step in pg_regexec().
|
|
*/
|
|
static struct dfa *
|
|
getsubdfa(struct vars * v,
|
|
struct subre * t)
|
|
{
|
|
if (v->subdfas[t->id] == NULL)
|
|
{
|
|
v->subdfas[t->id] = newdfa(v, &t->cnfa, &v->g->cmap, DOMALLOC);
|
|
if (ISERR())
|
|
return NULL;
|
|
}
|
|
return v->subdfas[t->id];
|
|
}
|
|
|
|
/*
|
|
* find - find a match for the main NFA (no-complications case)
|
|
*/
|
|
static int
|
|
find(struct vars * v,
|
|
struct cnfa * cnfa,
|
|
struct colormap * cm)
|
|
{
|
|
struct dfa *s;
|
|
struct dfa *d;
|
|
chr *begin;
|
|
chr *end = NULL;
|
|
chr *cold;
|
|
chr *open; /* open and close of range of possible starts */
|
|
chr *close;
|
|
int hitend;
|
|
int shorter = (v->g->tree->flags & SHORTER) ? 1 : 0;
|
|
|
|
/* first, a shot with the search RE */
|
|
s = newdfa(v, &v->g->search, cm, &v->dfa1);
|
|
assert(!(ISERR() && s != NULL));
|
|
NOERR();
|
|
MDEBUG(("\nsearch at %ld\n", LOFF(v->start)));
|
|
cold = NULL;
|
|
close = shortest(v, s, v->search_start, v->search_start, v->stop,
|
|
&cold, (int *) NULL);
|
|
freedfa(s);
|
|
NOERR();
|
|
if (v->g->cflags & REG_EXPECT)
|
|
{
|
|
assert(v->details != NULL);
|
|
if (cold != NULL)
|
|
v->details->rm_extend.rm_so = OFF(cold);
|
|
else
|
|
v->details->rm_extend.rm_so = OFF(v->stop);
|
|
v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */
|
|
}
|
|
if (close == NULL) /* not found */
|
|
return REG_NOMATCH;
|
|
if (v->nmatch == 0) /* found, don't need exact location */
|
|
return REG_OKAY;
|
|
|
|
/* find starting point and match */
|
|
assert(cold != NULL);
|
|
open = cold;
|
|
cold = NULL;
|
|
MDEBUG(("between %ld and %ld\n", LOFF(open), LOFF(close)));
|
|
d = newdfa(v, cnfa, cm, &v->dfa1);
|
|
assert(!(ISERR() && d != NULL));
|
|
NOERR();
|
|
for (begin = open; begin <= close; begin++)
|
|
{
|
|
MDEBUG(("\nfind trying at %ld\n", LOFF(begin)));
|
|
if (shorter)
|
|
end = shortest(v, d, begin, begin, v->stop,
|
|
(chr **) NULL, &hitend);
|
|
else
|
|
end = longest(v, d, begin, v->stop, &hitend);
|
|
NOERR();
|
|
if (hitend && cold == NULL)
|
|
cold = begin;
|
|
if (end != NULL)
|
|
break; /* NOTE BREAK OUT */
|
|
}
|
|
assert(end != NULL); /* search RE succeeded so loop should */
|
|
freedfa(d);
|
|
|
|
/* and pin down details */
|
|
assert(v->nmatch > 0);
|
|
v->pmatch[0].rm_so = OFF(begin);
|
|
v->pmatch[0].rm_eo = OFF(end);
|
|
if (v->g->cflags & REG_EXPECT)
|
|
{
|
|
if (cold != NULL)
|
|
v->details->rm_extend.rm_so = OFF(cold);
|
|
else
|
|
v->details->rm_extend.rm_so = OFF(v->stop);
|
|
v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */
|
|
}
|
|
if (v->nmatch == 1) /* no need for submatches */
|
|
return REG_OKAY;
|
|
|
|
/* find submatches */
|
|
zapallsubs(v->pmatch, v->nmatch);
|
|
return cdissect(v, v->g->tree, begin, end);
|
|
}
|
|
|
|
/*
|
|
* cfind - find a match for the main NFA (with complications)
|
|
*/
|
|
static int
|
|
cfind(struct vars * v,
|
|
struct cnfa * cnfa,
|
|
struct colormap * cm)
|
|
{
|
|
struct dfa *s;
|
|
struct dfa *d;
|
|
chr *cold;
|
|
int ret;
|
|
|
|
s = newdfa(v, &v->g->search, cm, &v->dfa1);
|
|
NOERR();
|
|
d = newdfa(v, cnfa, cm, &v->dfa2);
|
|
if (ISERR())
|
|
{
|
|
assert(d == NULL);
|
|
freedfa(s);
|
|
return v->err;
|
|
}
|
|
|
|
ret = cfindloop(v, cnfa, cm, d, s, &cold);
|
|
|
|
freedfa(d);
|
|
freedfa(s);
|
|
NOERR();
|
|
if (v->g->cflags & REG_EXPECT)
|
|
{
|
|
assert(v->details != NULL);
|
|
if (cold != NULL)
|
|
v->details->rm_extend.rm_so = OFF(cold);
|
|
else
|
|
v->details->rm_extend.rm_so = OFF(v->stop);
|
|
v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* cfindloop - the heart of cfind
|
|
*/
|
|
static int
|
|
cfindloop(struct vars * v,
|
|
struct cnfa * cnfa,
|
|
struct colormap * cm,
|
|
struct dfa * d,
|
|
struct dfa * s,
|
|
chr **coldp) /* where to put coldstart pointer */
|
|
{
|
|
chr *begin;
|
|
chr *end;
|
|
chr *cold;
|
|
chr *open; /* open and close of range of possible starts */
|
|
chr *close;
|
|
chr *estart;
|
|
chr *estop;
|
|
int er;
|
|
int shorter = v->g->tree->flags & SHORTER;
|
|
int hitend;
|
|
|
|
assert(d != NULL && s != NULL);
|
|
cold = NULL;
|
|
close = v->search_start;
|
|
do
|
|
{
|
|
MDEBUG(("\ncsearch at %ld\n", LOFF(close)));
|
|
close = shortest(v, s, close, close, v->stop, &cold, (int *) NULL);
|
|
if (close == NULL)
|
|
break; /* NOTE BREAK */
|
|
assert(cold != NULL);
|
|
open = cold;
|
|
cold = NULL;
|
|
MDEBUG(("cbetween %ld and %ld\n", LOFF(open), LOFF(close)));
|
|
for (begin = open; begin <= close; begin++)
|
|
{
|
|
MDEBUG(("\ncfind trying at %ld\n", LOFF(begin)));
|
|
estart = begin;
|
|
estop = v->stop;
|
|
for (;;)
|
|
{
|
|
if (shorter)
|
|
end = shortest(v, d, begin, estart,
|
|
estop, (chr **) NULL, &hitend);
|
|
else
|
|
end = longest(v, d, begin, estop,
|
|
&hitend);
|
|
if (hitend && cold == NULL)
|
|
cold = begin;
|
|
if (end == NULL)
|
|
break; /* NOTE BREAK OUT */
|
|
MDEBUG(("tentative end %ld\n", LOFF(end)));
|
|
zapallsubs(v->pmatch, v->nmatch);
|
|
er = cdissect(v, v->g->tree, begin, end);
|
|
if (er == REG_OKAY)
|
|
{
|
|
if (v->nmatch > 0)
|
|
{
|
|
v->pmatch[0].rm_so = OFF(begin);
|
|
v->pmatch[0].rm_eo = OFF(end);
|
|
}
|
|
*coldp = cold;
|
|
return REG_OKAY;
|
|
}
|
|
if (er != REG_NOMATCH)
|
|
{
|
|
ERR(er);
|
|
*coldp = cold;
|
|
return er;
|
|
}
|
|
/* try next shorter/longer match with same begin point */
|
|
if (shorter)
|
|
{
|
|
if (end == estop)
|
|
break; /* NOTE BREAK OUT */
|
|
estart = end + 1;
|
|
}
|
|
else
|
|
{
|
|
if (end == begin)
|
|
break; /* NOTE BREAK OUT */
|
|
estop = end - 1;
|
|
}
|
|
} /* end loop over endpoint positions */
|
|
} /* end loop over beginning positions */
|
|
} while (close < v->stop);
|
|
|
|
*coldp = cold;
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/*
|
|
* zapallsubs - initialize all subexpression matches to "no match"
|
|
*/
|
|
static void
|
|
zapallsubs(regmatch_t *p,
|
|
size_t n)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = n - 1; i > 0; i--)
|
|
{
|
|
p[i].rm_so = -1;
|
|
p[i].rm_eo = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* zaptreesubs - initialize subexpressions within subtree to "no match"
|
|
*/
|
|
static void
|
|
zaptreesubs(struct vars * v,
|
|
struct subre * t)
|
|
{
|
|
if (t->op == '(')
|
|
{
|
|
int n = t->subno;
|
|
|
|
assert(n > 0);
|
|
if ((size_t) n < v->nmatch)
|
|
{
|
|
v->pmatch[n].rm_so = -1;
|
|
v->pmatch[n].rm_eo = -1;
|
|
}
|
|
}
|
|
|
|
if (t->left != NULL)
|
|
zaptreesubs(v, t->left);
|
|
if (t->right != NULL)
|
|
zaptreesubs(v, t->right);
|
|
}
|
|
|
|
/*
|
|
* subset - set subexpression match data for a successful subre
|
|
*/
|
|
static void
|
|
subset(struct vars * v,
|
|
struct subre * sub,
|
|
chr *begin,
|
|
chr *end)
|
|
{
|
|
int n = sub->subno;
|
|
|
|
assert(n > 0);
|
|
if ((size_t) n >= v->nmatch)
|
|
return;
|
|
|
|
MDEBUG(("setting %d\n", n));
|
|
v->pmatch[n].rm_so = OFF(begin);
|
|
v->pmatch[n].rm_eo = OFF(end);
|
|
}
|
|
|
|
/*
|
|
* cdissect - check backrefs and determine subexpression matches
|
|
*
|
|
* cdissect recursively processes a subre tree to check matching of backrefs
|
|
* and/or identify submatch boundaries for capture nodes. The proposed match
|
|
* runs from "begin" to "end" (not including "end"), and we are basically
|
|
* "dissecting" it to see where the submatches are.
|
|
*
|
|
* Before calling any level of cdissect, the caller must have run the node's
|
|
* DFA and found that the proposed substring satisfies the DFA. (We make
|
|
* the caller do that because in concatenation and iteration nodes, it's
|
|
* much faster to check all the substrings against the child DFAs before we
|
|
* recurse.) Also, caller must have cleared subexpression match data via
|
|
* zaptreesubs (or zapallsubs at the top level).
|
|
*/
|
|
static int /* regexec return code */
|
|
cdissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
int er;
|
|
|
|
assert(t != NULL);
|
|
MDEBUG(("cdissect %ld-%ld %c\n", LOFF(begin), LOFF(end), t->op));
|
|
|
|
/* handy place to check for operation cancel */
|
|
if (CANCEL_REQUESTED(v->re))
|
|
return REG_CANCEL;
|
|
|
|
switch (t->op)
|
|
{
|
|
case '=': /* terminal node */
|
|
assert(t->left == NULL && t->right == NULL);
|
|
er = REG_OKAY; /* no action, parent did the work */
|
|
break;
|
|
case 'b': /* back reference */
|
|
assert(t->left == NULL && t->right == NULL);
|
|
er = cbrdissect(v, t, begin, end);
|
|
break;
|
|
case '.': /* concatenation */
|
|
assert(t->left != NULL && t->right != NULL);
|
|
if (t->left->flags & SHORTER) /* reverse scan */
|
|
er = crevcondissect(v, t, begin, end);
|
|
else
|
|
er = ccondissect(v, t, begin, end);
|
|
break;
|
|
case '|': /* alternation */
|
|
assert(t->left != NULL);
|
|
er = caltdissect(v, t, begin, end);
|
|
break;
|
|
case '*': /* iteration */
|
|
assert(t->left != NULL);
|
|
if (t->left->flags & SHORTER) /* reverse scan */
|
|
er = creviterdissect(v, t, begin, end);
|
|
else
|
|
er = citerdissect(v, t, begin, end);
|
|
break;
|
|
case '(': /* capturing */
|
|
assert(t->left != NULL && t->right == NULL);
|
|
assert(t->subno > 0);
|
|
er = cdissect(v, t->left, begin, end);
|
|
if (er == REG_OKAY)
|
|
subset(v, t, begin, end);
|
|
break;
|
|
default:
|
|
er = REG_ASSERT;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We should never have a match failure unless backrefs lurk below;
|
|
* otherwise, either caller failed to check the DFA, or there's some
|
|
* inconsistency between the DFA and the node's innards.
|
|
*/
|
|
assert(er != REG_NOMATCH || (t->flags & BACKR));
|
|
|
|
return er;
|
|
}
|
|
|
|
/*
|
|
* ccondissect - dissect match for concatenation node
|
|
*/
|
|
static int /* regexec return code */
|
|
ccondissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
struct dfa *d;
|
|
struct dfa *d2;
|
|
chr *mid;
|
|
int er;
|
|
|
|
assert(t->op == '.');
|
|
assert(t->left != NULL && t->left->cnfa.nstates > 0);
|
|
assert(t->right != NULL && t->right->cnfa.nstates > 0);
|
|
assert(!(t->left->flags & SHORTER));
|
|
|
|
d = getsubdfa(v, t->left);
|
|
NOERR();
|
|
d2 = getsubdfa(v, t->right);
|
|
NOERR();
|
|
MDEBUG(("cconcat %d\n", t->id));
|
|
|
|
/* pick a tentative midpoint */
|
|
mid = longest(v, d, begin, end, (int *) NULL);
|
|
if (mid == NULL)
|
|
return REG_NOMATCH;
|
|
MDEBUG(("tentative midpoint %ld\n", LOFF(mid)));
|
|
|
|
/* iterate until satisfaction or failure */
|
|
for (;;)
|
|
{
|
|
/* try this midpoint on for size */
|
|
if (longest(v, d2, mid, end, (int *) NULL) == end)
|
|
{
|
|
er = cdissect(v, t->left, begin, mid);
|
|
if (er == REG_OKAY)
|
|
{
|
|
er = cdissect(v, t->right, mid, end);
|
|
if (er == REG_OKAY)
|
|
{
|
|
/* satisfaction */
|
|
MDEBUG(("successful\n"));
|
|
return REG_OKAY;
|
|
}
|
|
}
|
|
if (er != REG_NOMATCH)
|
|
return er;
|
|
}
|
|
|
|
/* that midpoint didn't work, find a new one */
|
|
if (mid == begin)
|
|
{
|
|
/* all possibilities exhausted */
|
|
MDEBUG(("%d no midpoint\n", t->id));
|
|
return REG_NOMATCH;
|
|
}
|
|
mid = longest(v, d, begin, mid - 1, (int *) NULL);
|
|
if (mid == NULL)
|
|
{
|
|
/* failed to find a new one */
|
|
MDEBUG(("%d failed midpoint\n", t->id));
|
|
return REG_NOMATCH;
|
|
}
|
|
MDEBUG(("%d: new midpoint %ld\n", t->id, LOFF(mid)));
|
|
zaptreesubs(v, t->left);
|
|
zaptreesubs(v, t->right);
|
|
}
|
|
|
|
/* can't get here */
|
|
return REG_ASSERT;
|
|
}
|
|
|
|
/*
|
|
* crevcondissect - dissect match for concatenation node, shortest-first
|
|
*/
|
|
static int /* regexec return code */
|
|
crevcondissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
struct dfa *d;
|
|
struct dfa *d2;
|
|
chr *mid;
|
|
int er;
|
|
|
|
assert(t->op == '.');
|
|
assert(t->left != NULL && t->left->cnfa.nstates > 0);
|
|
assert(t->right != NULL && t->right->cnfa.nstates > 0);
|
|
assert(t->left->flags & SHORTER);
|
|
|
|
d = getsubdfa(v, t->left);
|
|
NOERR();
|
|
d2 = getsubdfa(v, t->right);
|
|
NOERR();
|
|
MDEBUG(("crevcon %d\n", t->id));
|
|
|
|
/* pick a tentative midpoint */
|
|
mid = shortest(v, d, begin, begin, end, (chr **) NULL, (int *) NULL);
|
|
if (mid == NULL)
|
|
return REG_NOMATCH;
|
|
MDEBUG(("tentative midpoint %ld\n", LOFF(mid)));
|
|
|
|
/* iterate until satisfaction or failure */
|
|
for (;;)
|
|
{
|
|
/* try this midpoint on for size */
|
|
if (longest(v, d2, mid, end, (int *) NULL) == end)
|
|
{
|
|
er = cdissect(v, t->left, begin, mid);
|
|
if (er == REG_OKAY)
|
|
{
|
|
er = cdissect(v, t->right, mid, end);
|
|
if (er == REG_OKAY)
|
|
{
|
|
/* satisfaction */
|
|
MDEBUG(("successful\n"));
|
|
return REG_OKAY;
|
|
}
|
|
}
|
|
if (er != REG_NOMATCH)
|
|
return er;
|
|
}
|
|
|
|
/* that midpoint didn't work, find a new one */
|
|
if (mid == end)
|
|
{
|
|
/* all possibilities exhausted */
|
|
MDEBUG(("%d no midpoint\n", t->id));
|
|
return REG_NOMATCH;
|
|
}
|
|
mid = shortest(v, d, begin, mid + 1, end, (chr **) NULL, (int *) NULL);
|
|
if (mid == NULL)
|
|
{
|
|
/* failed to find a new one */
|
|
MDEBUG(("%d failed midpoint\n", t->id));
|
|
return REG_NOMATCH;
|
|
}
|
|
MDEBUG(("%d: new midpoint %ld\n", t->id, LOFF(mid)));
|
|
zaptreesubs(v, t->left);
|
|
zaptreesubs(v, t->right);
|
|
}
|
|
|
|
/* can't get here */
|
|
return REG_ASSERT;
|
|
}
|
|
|
|
/*
|
|
* cbrdissect - dissect match for backref node
|
|
*/
|
|
static int /* regexec return code */
|
|
cbrdissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
int n = t->subno;
|
|
size_t numreps;
|
|
size_t tlen;
|
|
size_t brlen;
|
|
chr *brstring;
|
|
chr *p;
|
|
int min = t->min;
|
|
int max = t->max;
|
|
|
|
assert(t != NULL);
|
|
assert(t->op == 'b');
|
|
assert(n >= 0);
|
|
assert((size_t) n < v->nmatch);
|
|
|
|
MDEBUG(("cbackref n%d %d{%d-%d}\n", t->id, n, min, max));
|
|
|
|
/* get the backreferenced string */
|
|
if (v->pmatch[n].rm_so == -1)
|
|
return REG_NOMATCH;
|
|
brstring = v->start + v->pmatch[n].rm_so;
|
|
brlen = v->pmatch[n].rm_eo - v->pmatch[n].rm_so;
|
|
|
|
/* special cases for zero-length strings */
|
|
if (brlen == 0)
|
|
{
|
|
/*
|
|
* matches only if target is zero length, but any number of
|
|
* repetitions can be considered to be present
|
|
*/
|
|
if (begin == end && min <= max)
|
|
{
|
|
MDEBUG(("cbackref matched trivially\n"));
|
|
return REG_OKAY;
|
|
}
|
|
return REG_NOMATCH;
|
|
}
|
|
if (begin == end)
|
|
{
|
|
/* matches only if zero repetitions are okay */
|
|
if (min == 0)
|
|
{
|
|
MDEBUG(("cbackref matched trivially\n"));
|
|
return REG_OKAY;
|
|
}
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/*
|
|
* check target length to see if it could possibly be an allowed number of
|
|
* repetitions of brstring
|
|
*/
|
|
assert(end > begin);
|
|
tlen = end - begin;
|
|
if (tlen % brlen != 0)
|
|
return REG_NOMATCH;
|
|
numreps = tlen / brlen;
|
|
if (numreps < min || (numreps > max && max != INFINITY))
|
|
return REG_NOMATCH;
|
|
|
|
/* okay, compare the actual string contents */
|
|
p = begin;
|
|
while (numreps-- > 0)
|
|
{
|
|
if ((*v->g->compare) (brstring, p, brlen) != 0)
|
|
return REG_NOMATCH;
|
|
p += brlen;
|
|
}
|
|
|
|
MDEBUG(("cbackref matched\n"));
|
|
return REG_OKAY;
|
|
}
|
|
|
|
/*
|
|
* caltdissect - dissect match for alternation node
|
|
*/
|
|
static int /* regexec return code */
|
|
caltdissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
struct dfa *d;
|
|
int er;
|
|
|
|
/* We loop, rather than tail-recurse, to handle a chain of alternatives */
|
|
while (t != NULL)
|
|
{
|
|
assert(t->op == '|');
|
|
assert(t->left != NULL && t->left->cnfa.nstates > 0);
|
|
|
|
MDEBUG(("calt n%d\n", t->id));
|
|
|
|
d = getsubdfa(v, t->left);
|
|
NOERR();
|
|
if (longest(v, d, begin, end, (int *) NULL) == end)
|
|
{
|
|
MDEBUG(("calt matched\n"));
|
|
er = cdissect(v, t->left, begin, end);
|
|
if (er != REG_NOMATCH)
|
|
return er;
|
|
}
|
|
|
|
t = t->right;
|
|
}
|
|
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/*
|
|
* citerdissect - dissect match for iteration node
|
|
*/
|
|
static int /* regexec return code */
|
|
citerdissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
struct dfa *d;
|
|
chr **endpts;
|
|
chr *limit;
|
|
int min_matches;
|
|
size_t max_matches;
|
|
int nverified;
|
|
int k;
|
|
int i;
|
|
int er;
|
|
|
|
assert(t->op == '*');
|
|
assert(t->left != NULL && t->left->cnfa.nstates > 0);
|
|
assert(!(t->left->flags & SHORTER));
|
|
assert(begin <= end);
|
|
|
|
/*
|
|
* If zero matches are allowed, and target string is empty, just declare
|
|
* victory. OTOH, if target string isn't empty, zero matches can't work
|
|
* so we pretend the min is 1.
|
|
*/
|
|
min_matches = t->min;
|
|
if (min_matches <= 0)
|
|
{
|
|
if (begin == end)
|
|
return REG_OKAY;
|
|
min_matches = 1;
|
|
}
|
|
|
|
/*
|
|
* We need workspace to track the endpoints of each sub-match. Normally
|
|
* we consider only nonzero-length sub-matches, so there can be at most
|
|
* end-begin of them. However, if min is larger than that, we will also
|
|
* consider zero-length sub-matches in order to find enough matches.
|
|
*
|
|
* For convenience, endpts[0] contains the "begin" pointer and we store
|
|
* sub-match endpoints in endpts[1..max_matches].
|
|
*/
|
|
max_matches = end - begin;
|
|
if (max_matches > t->max && t->max != INFINITY)
|
|
max_matches = t->max;
|
|
if (max_matches < min_matches)
|
|
max_matches = min_matches;
|
|
endpts = (chr **) MALLOC((max_matches + 1) * sizeof(chr *));
|
|
if (endpts == NULL)
|
|
return REG_ESPACE;
|
|
endpts[0] = begin;
|
|
|
|
d = getsubdfa(v, t->left);
|
|
if (ISERR())
|
|
{
|
|
FREE(endpts);
|
|
return v->err;
|
|
}
|
|
MDEBUG(("citer %d\n", t->id));
|
|
|
|
/*
|
|
* Our strategy is to first find a set of sub-match endpoints that are
|
|
* valid according to the child node's DFA, and then recursively dissect
|
|
* each sub-match to confirm validity. If any validity check fails,
|
|
* backtrack the last sub-match and try again. And, when we next try for
|
|
* a validity check, we need not recheck any successfully verified
|
|
* sub-matches that we didn't move the endpoints of. nverified remembers
|
|
* how many sub-matches are currently known okay.
|
|
*/
|
|
|
|
/* initialize to consider first sub-match */
|
|
nverified = 0;
|
|
k = 1;
|
|
limit = end;
|
|
|
|
/* iterate until satisfaction or failure */
|
|
while (k > 0)
|
|
{
|
|
/* try to find an endpoint for the k'th sub-match */
|
|
endpts[k] = longest(v, d, endpts[k - 1], limit, (int *) NULL);
|
|
if (endpts[k] == NULL)
|
|
{
|
|
/* no match possible, so see if we can shorten previous one */
|
|
k--;
|
|
goto backtrack;
|
|
}
|
|
MDEBUG(("%d: working endpoint %d: %ld\n",
|
|
t->id, k, LOFF(endpts[k])));
|
|
|
|
/* k'th sub-match can no longer be considered verified */
|
|
if (nverified >= k)
|
|
nverified = k - 1;
|
|
|
|
if (endpts[k] != end)
|
|
{
|
|
/* haven't reached end yet, try another iteration if allowed */
|
|
if (k >= max_matches)
|
|
{
|
|
/* must try to shorten some previous match */
|
|
k--;
|
|
goto backtrack;
|
|
}
|
|
|
|
/* reject zero-length match unless necessary to achieve min */
|
|
if (endpts[k] == endpts[k - 1] &&
|
|
(k >= min_matches || min_matches - k < end - endpts[k]))
|
|
goto backtrack;
|
|
|
|
k++;
|
|
limit = end;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We've identified a way to divide the string into k sub-matches that
|
|
* works so far as the child DFA can tell. If k is an allowed number
|
|
* of matches, start the slow part: recurse to verify each sub-match.
|
|
* We always have k <= max_matches, needn't check that.
|
|
*/
|
|
if (k < min_matches)
|
|
goto backtrack;
|
|
|
|
MDEBUG(("%d: verifying %d..%d\n", t->id, nverified + 1, k));
|
|
|
|
for (i = nverified + 1; i <= k; i++)
|
|
{
|
|
zaptreesubs(v, t->left);
|
|
er = cdissect(v, t->left, endpts[i - 1], endpts[i]);
|
|
if (er == REG_OKAY)
|
|
{
|
|
nverified = i;
|
|
continue;
|
|
}
|
|
if (er == REG_NOMATCH)
|
|
break;
|
|
/* oops, something failed */
|
|
FREE(endpts);
|
|
return er;
|
|
}
|
|
|
|
if (i > k)
|
|
{
|
|
/* satisfaction */
|
|
MDEBUG(("%d successful\n", t->id));
|
|
FREE(endpts);
|
|
return REG_OKAY;
|
|
}
|
|
|
|
/* match failed to verify, so backtrack */
|
|
|
|
backtrack:
|
|
|
|
/*
|
|
* Must consider shorter versions of the current sub-match. However,
|
|
* we'll only ask for a zero-length match if necessary.
|
|
*/
|
|
while (k > 0)
|
|
{
|
|
chr *prev_end = endpts[k - 1];
|
|
|
|
if (endpts[k] > prev_end)
|
|
{
|
|
limit = endpts[k] - 1;
|
|
if (limit > prev_end ||
|
|
(k < min_matches && min_matches - k >= end - prev_end))
|
|
{
|
|
/* break out of backtrack loop, continue the outer one */
|
|
break;
|
|
}
|
|
}
|
|
/* can't shorten k'th sub-match any more, consider previous one */
|
|
k--;
|
|
}
|
|
}
|
|
|
|
/* all possibilities exhausted */
|
|
MDEBUG(("%d failed\n", t->id));
|
|
FREE(endpts);
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
/*
|
|
* creviterdissect - dissect match for iteration node, shortest-first
|
|
*/
|
|
static int /* regexec return code */
|
|
creviterdissect(struct vars * v,
|
|
struct subre * t,
|
|
chr *begin, /* beginning of relevant substring */
|
|
chr *end) /* end of same */
|
|
{
|
|
struct dfa *d;
|
|
chr **endpts;
|
|
chr *limit;
|
|
int min_matches;
|
|
size_t max_matches;
|
|
int nverified;
|
|
int k;
|
|
int i;
|
|
int er;
|
|
|
|
assert(t->op == '*');
|
|
assert(t->left != NULL && t->left->cnfa.nstates > 0);
|
|
assert(t->left->flags & SHORTER);
|
|
assert(begin <= end);
|
|
|
|
/*
|
|
* If zero matches are allowed, and target string is empty, just declare
|
|
* victory. OTOH, if target string isn't empty, zero matches can't work
|
|
* so we pretend the min is 1.
|
|
*/
|
|
min_matches = t->min;
|
|
if (min_matches <= 0)
|
|
{
|
|
if (begin == end)
|
|
return REG_OKAY;
|
|
min_matches = 1;
|
|
}
|
|
|
|
/*
|
|
* We need workspace to track the endpoints of each sub-match. Normally
|
|
* we consider only nonzero-length sub-matches, so there can be at most
|
|
* end-begin of them. However, if min is larger than that, we will also
|
|
* consider zero-length sub-matches in order to find enough matches.
|
|
*
|
|
* For convenience, endpts[0] contains the "begin" pointer and we store
|
|
* sub-match endpoints in endpts[1..max_matches].
|
|
*/
|
|
max_matches = end - begin;
|
|
if (max_matches > t->max && t->max != INFINITY)
|
|
max_matches = t->max;
|
|
if (max_matches < min_matches)
|
|
max_matches = min_matches;
|
|
endpts = (chr **) MALLOC((max_matches + 1) * sizeof(chr *));
|
|
if (endpts == NULL)
|
|
return REG_ESPACE;
|
|
endpts[0] = begin;
|
|
|
|
d = getsubdfa(v, t->left);
|
|
if (ISERR())
|
|
{
|
|
FREE(endpts);
|
|
return v->err;
|
|
}
|
|
MDEBUG(("creviter %d\n", t->id));
|
|
|
|
/*
|
|
* Our strategy is to first find a set of sub-match endpoints that are
|
|
* valid according to the child node's DFA, and then recursively dissect
|
|
* each sub-match to confirm validity. If any validity check fails,
|
|
* backtrack the last sub-match and try again. And, when we next try for
|
|
* a validity check, we need not recheck any successfully verified
|
|
* sub-matches that we didn't move the endpoints of. nverified remembers
|
|
* how many sub-matches are currently known okay.
|
|
*/
|
|
|
|
/* initialize to consider first sub-match */
|
|
nverified = 0;
|
|
k = 1;
|
|
limit = begin;
|
|
|
|
/* iterate until satisfaction or failure */
|
|
while (k > 0)
|
|
{
|
|
/* disallow zero-length match unless necessary to achieve min */
|
|
if (limit == endpts[k - 1] &&
|
|
limit != end &&
|
|
(k >= min_matches || min_matches - k < end - limit))
|
|
limit++;
|
|
|
|
/* if this is the last allowed sub-match, it must reach to the end */
|
|
if (k >= max_matches)
|
|
limit = end;
|
|
|
|
/* try to find an endpoint for the k'th sub-match */
|
|
endpts[k] = shortest(v, d, endpts[k - 1], limit, end,
|
|
(chr **) NULL, (int *) NULL);
|
|
if (endpts[k] == NULL)
|
|
{
|
|
/* no match possible, so see if we can lengthen previous one */
|
|
k--;
|
|
goto backtrack;
|
|
}
|
|
MDEBUG(("%d: working endpoint %d: %ld\n",
|
|
t->id, k, LOFF(endpts[k])));
|
|
|
|
/* k'th sub-match can no longer be considered verified */
|
|
if (nverified >= k)
|
|
nverified = k - 1;
|
|
|
|
if (endpts[k] != end)
|
|
{
|
|
/* haven't reached end yet, try another iteration if allowed */
|
|
if (k >= max_matches)
|
|
{
|
|
/* must try to lengthen some previous match */
|
|
k--;
|
|
goto backtrack;
|
|
}
|
|
|
|
k++;
|
|
limit = endpts[k - 1];
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We've identified a way to divide the string into k sub-matches that
|
|
* works so far as the child DFA can tell. If k is an allowed number
|
|
* of matches, start the slow part: recurse to verify each sub-match.
|
|
* We always have k <= max_matches, needn't check that.
|
|
*/
|
|
if (k < min_matches)
|
|
goto backtrack;
|
|
|
|
MDEBUG(("%d: verifying %d..%d\n", t->id, nverified + 1, k));
|
|
|
|
for (i = nverified + 1; i <= k; i++)
|
|
{
|
|
zaptreesubs(v, t->left);
|
|
er = cdissect(v, t->left, endpts[i - 1], endpts[i]);
|
|
if (er == REG_OKAY)
|
|
{
|
|
nverified = i;
|
|
continue;
|
|
}
|
|
if (er == REG_NOMATCH)
|
|
break;
|
|
/* oops, something failed */
|
|
FREE(endpts);
|
|
return er;
|
|
}
|
|
|
|
if (i > k)
|
|
{
|
|
/* satisfaction */
|
|
MDEBUG(("%d successful\n", t->id));
|
|
FREE(endpts);
|
|
return REG_OKAY;
|
|
}
|
|
|
|
/* match failed to verify, so backtrack */
|
|
|
|
backtrack:
|
|
|
|
/*
|
|
* Must consider longer versions of the current sub-match.
|
|
*/
|
|
while (k > 0)
|
|
{
|
|
if (endpts[k] < end)
|
|
{
|
|
limit = endpts[k] + 1;
|
|
/* break out of backtrack loop, continue the outer one */
|
|
break;
|
|
}
|
|
/* can't lengthen k'th sub-match any more, consider previous one */
|
|
k--;
|
|
}
|
|
}
|
|
|
|
/* all possibilities exhausted */
|
|
MDEBUG(("%d failed\n", t->id));
|
|
FREE(endpts);
|
|
return REG_NOMATCH;
|
|
}
|
|
|
|
|
|
|
|
#include "rege_dfa.c"
|