X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/451458f4c989298d91b85a2bbe5337a250ec7e60..ccf0e7f6d42817cad37fc6480a6c0381fe6799e0:/src/regex/regexec.c diff --git a/src/regex/regexec.c b/src/regex/regexec.c index 41d49bdab5..7e314950e7 100644 --- a/src/regex/regexec.c +++ b/src/regex/regexec.c @@ -1,1038 +1,140 @@ /* - * re_*exec and friends - match REs + * the outer shell of regexec() * - * 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. + * This file includes engine.c *twice*, after muchos fiddling with the + * macros that code uses. This lets the same code operate on two different + * representations for state sets. + */ +#include +#include +#include +#include +#include +#include +#include "regex.h" + +#include "utils.h" +#include "regex2.h" + +#ifdef REDEBUG +static int nope = 0; /* for use in asserts; shuts lint up */ +#endif + +/* macros for manipulating states, small version */ +#define states unsigned +#define states1 unsigned /* for later use in regexec() decision */ +#define CLEAR(v) ((v) = 0) +#define SET0(v, n) ((v) &= ~((unsigned)1 << (n))) +#define SET1(v, n) ((v) |= (unsigned)1 << (n)) +#define ISSET(v, n) ((v) & ((unsigned)1 << (n))) +#define ASSIGN(d, s) ((d) = (s)) +#define EQ(a, b) ((a) == (b)) +#define STATEVARS int dummy /* dummy version */ +#define STATESETUP(m, n) /* nothing */ +#define STATETEARDOWN(m) /* nothing */ +#define SETUP(v) ((v) = 0) +#define onestate unsigned +#define INIT(o, n) ((o) = (unsigned)1 << (n)) +#define INC(o) ((o) <<= 1) +#define ISSTATEIN(v, o) ((v) & (o)) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) << (n)) +#define BACK(dst, src, n) ((dst) |= ((unsigned)(src)&(here)) >> (n)) +#define ISSETBACK(v, n) ((v) & ((unsigned)here >> (n))) +/* function names */ +#define SNAMES /* engine.c looks after details */ + +#include "engine.c" + +/* now undo things */ +#undef states +#undef CLEAR +#undef SET0 +#undef SET1 +#undef ISSET +#undef ASSIGN +#undef EQ +#undef STATEVARS +#undef STATESETUP +#undef STATETEARDOWN +#undef SETUP +#undef onestate +#undef INIT +#undef INC +#undef ISSTATEIN +#undef FWD +#undef BACK +#undef ISSETBACK +#undef SNAMES + +/* macros for manipulating states, large version */ +#define states char * +#define CLEAR(v) memset(v, 0, m->g->nstates) +#define SET0(v, n) ((v)[n] = 0) +#define SET1(v, n) ((v)[n] = 1) +#define ISSET(v, n) ((v)[n]) +#define ASSIGN(d, s) memcpy(d, s, m->g->nstates) +#define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) +#define STATEVARS int vn; char *space +#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ + if ((m)->space == NULL) return(REG_ESPACE); \ + (m)->vn = 0; } +#define STATETEARDOWN(m) { free((m)->space); } +#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) +#define onestate int +#define INIT(o, n) ((o) = (n)) +#define INC(o) ((o)++) +#define ISSTATEIN(v, o) ((v)[o]) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) +#define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) +#define ISSETBACK(v, n) ((v)[here - (n)]) +/* function names */ +#define LNAMES /* flag */ + +#include "engine.c" + +/* + - regexec - interface for matching + = extern int regexec(const regex_t *, const char *, size_t, \ + = regmatch_t [], int); + = #define REG_NOTBOL 00001 + = #define REG_NOTEOL 00002 + = #define REG_STARTEND 00004 + = #define REG_TRACE 00400 // tracing of execution + = #define REG_LARGE 01000 // force large representation + = #define REG_BACKR 02000 // force use of backref code * - */ - -#include "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 *stop; /* just past end of string */ - int err; /* error code if any (0 none) */ - regoff_t *mem; /* memory vector for backtracking */ - 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 - */ -/* =====^!^===== begin forwards =====^!^===== */ -/* automatically gathered by fwd; do not hand-edit */ -/* === regexec.c === */ -int exec _ANSI_ARGS_((regex_t *, CONST chr *, size_t, rm_detail_t *, size_t, regmatch_t [], int)); -static int find _ANSI_ARGS_((struct vars *, struct cnfa *, struct colormap *)); -static int cfind _ANSI_ARGS_((struct vars *, struct cnfa *, struct colormap *)); -static int cfindloop _ANSI_ARGS_((struct vars *, struct cnfa *, struct colormap *, struct dfa *, struct dfa *, chr **)); -static VOID zapsubs _ANSI_ARGS_((regmatch_t *, size_t)); -static VOID zapmem _ANSI_ARGS_((struct vars *, struct subre *)); -static VOID subset _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int dissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int condissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int altdissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int cdissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int ccondissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int crevdissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int cbrdissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -static int caltdissect _ANSI_ARGS_((struct vars *, struct subre *, chr *, chr *)); -/* === rege_dfa.c === */ -static chr *longest _ANSI_ARGS_((struct vars *, struct dfa *, chr *, chr *, int *)); -static chr *shortest _ANSI_ARGS_((struct vars *, struct dfa *, chr *, chr *, chr *, chr **, int *)); -static chr *lastcold _ANSI_ARGS_((struct vars *, struct dfa *)); -static struct dfa *newdfa _ANSI_ARGS_((struct vars *, struct cnfa *, struct colormap *, struct smalldfa *)); -static VOID freedfa _ANSI_ARGS_((struct dfa *)); -static unsigned hash _ANSI_ARGS_((unsigned *, int)); -static struct sset *initialize _ANSI_ARGS_((struct vars *, struct dfa *, chr *)); -static struct sset *miss _ANSI_ARGS_((struct vars *, struct dfa *, struct sset *, pcolor, chr *, chr *)); -static int lacon _ANSI_ARGS_((struct vars *, struct cnfa *, chr *, pcolor)); -static struct sset *getvacant _ANSI_ARGS_((struct vars *, struct dfa *, chr *, chr *)); -static struct sset *pickss _ANSI_ARGS_((struct vars *, struct dfa *, chr *, chr *)); -/* automatically gathered by fwd; do not hand-edit */ -/* =====^!^===== end forwards =====^!^===== */ - - - -/* - - exec - match regular expression - ^ int exec(regex_t *, CONST chr *, size_t, rm_detail_t *, - ^ size_t, regmatch_t [], int); - */ -int -exec(re, string, len, details, nmatch, pmatch, flags) -regex_t *re; -CONST chr *string; -size_t len; -rm_detail_t *details; + * We put this here so we can exploit knowledge of the state representation + * when choosing which matcher to call. Also, by this point the matchers + * have been prototyped. + */ +int /* 0 success, REG_NOMATCH failure */ +regexec(preg, string, nmatch, pmatch, eflags) +const regex_t *preg; +const char *string; size_t nmatch; regmatch_t pmatch[]; -int flags; +int eflags; { - struct vars var; - register struct vars *v = &var; - int st; - size_t n; - int backref; -# define LOCALMAT 20 - regmatch_t mat[LOCALMAT]; -# define LOCALMEM 40 - regoff_t mem[LOCALMEM]; - - /* sanity checks */ - if (re == NULL || string == NULL || re->re_magic != REMAGIC) - return REG_INVARG; - if (re->re_csize != sizeof(chr)) - return REG_MIXED; - - /* setup */ - v->re = re; - v->g = (struct guts *)re->re_guts; - if ((v->g->cflags®_EXPECT) && details == NULL) - return REG_INVARG; - if (v->g->info®_UIMPOSSIBLE) - return REG_NOMATCH; - backref = (v->g->info®_UBACKREF) ? 1 : 0; - v->eflags = flags; - if (v->g->cflags®_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->stop = (chr *)string + len; - v->err = 0; - if (backref) { - /* need retry memory */ - assert(v->g->ntree >= 0); - n = (size_t)v->g->ntree; - if (n <= LOCALMEM) - v->mem = mem; - else - v->mem = (regoff_t *)MALLOC(n*sizeof(regoff_t)); - if (v->mem == NULL) { - if (v->pmatch != pmatch && v->pmatch != mat) - FREE(v->pmatch); - return REG_ESPACE; - } - } else - v->mem = NULL; - - /* do it */ - assert(v->g->tree != NULL); - if (backref) - st = cfind(v, &v->g->tree->cnfa, &v->g->cmap); + register struct re_guts *g = preg->re_g; +#ifdef REDEBUG +# define GOODFLAGS(f) (f) +#else +# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) +#endif + + if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) + return(REG_BADPAT); + assert(!(g->iflags&BAD)); + if (g->iflags&BAD) /* backstop for no-debug case */ + return(REG_BADPAT); + eflags = GOODFLAGS(eflags); + + if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) + return(smatcher(g, (char *)string, nmatch, pmatch, eflags)); 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) { - zapsubs(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); - if (v->mem != NULL && v->mem != mem) - FREE(v->mem); - return st; -} - -/* - - find - find a match for the main NFA (no-complications case) - ^ static int find(struct vars *, struct cnfa *, struct colormap *); - */ -static int -find(v, cnfa, cm) -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->start, v->start, v->stop, &cold, (int *)NULL); - freedfa(s); - NOERR(); - if (v->g->cflags®_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®_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; - - /* submatches */ - zapsubs(v->pmatch, v->nmatch); - return dissect(v, v->g->tree, begin, end); -} - -/* - - cfind - find a match for the main NFA (with complications) - ^ static int cfind(struct vars *, struct cnfa *, struct colormap *); - */ -static int -cfind(v, cnfa, cm) -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®_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 *, struct cnfa *, struct colormap *, - ^ struct dfa *, struct dfa *, chr **); - */ -static int -cfindloop(v, cnfa, cm, d, s, coldp) -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->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))); - zapsubs(v->pmatch, v->nmatch); - zapmem(v, v->g->tree); - 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); - return er; - } - if ((shorter) ? end == estop : end == begin) { - /* no point in trying again */ - *coldp = cold; - return REG_NOMATCH; - } - /* go around and try again */ - if (shorter) - estart = end + 1; - else - estop = end - 1; - } - } - } while (close < v->stop); - - *coldp = cold; - return REG_NOMATCH; -} - -/* - - zapsubs - initialize the subexpression matches to "no match" - ^ static VOID zapsubs(regmatch_t *, size_t); - */ -static VOID -zapsubs(p, n) -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; - } + return(lmatcher(g, (char *)string, nmatch, pmatch, eflags)); } - -/* - - zapmem - initialize the retry memory of a subtree to zeros - ^ static VOID zapmem(struct vars *, struct subre *); - */ -static VOID -zapmem(v, t) -struct vars *v; -struct subre *t; -{ - if (t == NULL) - return; - - assert(v->mem != NULL); - v->mem[t->retry] = 0; - if (t->op == '(') { - assert(t->subno > 0); - v->pmatch[t->subno].rm_so = -1; - v->pmatch[t->subno].rm_eo = -1; - } - - if (t->left != NULL) - zapmem(v, t->left); - if (t->right != NULL) - zapmem(v, t->right); -} - -/* - - subset - set any subexpression relevant to a successful subre - ^ static VOID subset(struct vars *, struct subre *, chr *, chr *); - */ -static VOID -subset(v, sub, begin, end) -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); -} - -/* - - dissect - determine subexpression matches (uncomplicated case) - ^ static int dissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -dissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ -{ - assert(t != NULL); - MDEBUG(("dissect %ld-%ld\n", LOFF(begin), LOFF(end))); - - switch (t->op) { - case '=': /* terminal node */ - assert(t->left == NULL && t->right == NULL); - return REG_OKAY; /* no action, parent did the work */ - break; - case '|': /* alternation */ - assert(t->left != NULL); - return altdissect(v, t, begin, end); - break; - case 'b': /* back ref -- shouldn't be calling us! */ - return REG_ASSERT; - break; - case '.': /* concatenation */ - assert(t->left != NULL && t->right != NULL); - return condissect(v, t, begin, end); - break; - case '(': /* capturing */ - assert(t->left != NULL && t->right == NULL); - assert(t->subno > 0); - subset(v, t, begin, end); - return dissect(v, t->left, begin, end); - break; - default: - return REG_ASSERT; - break; - } -} - -/* - - condissect - determine concatenation subexpression matches (uncomplicated) - ^ static int condissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -condissect(v, t, begin, end) -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 i; - int shorter = (t->left->flags&SHORTER) ? 1 : 0; - chr *stop = (shorter) ? end : begin; - - assert(t->op == '.'); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - assert(t->right != NULL && t->right->cnfa.nstates > 0); - - d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); - NOERR(); - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, &v->dfa2); - if (ISERR()) { - assert(d2 == NULL); - freedfa(d); - return v->err; - } - - /* pick a tentative midpoint */ - if (shorter) - mid = shortest(v, d, begin, begin, end, (chr **)NULL, - (int *)NULL); - else - mid = longest(v, d, begin, end, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_ASSERT; - } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - - /* iterate until satisfaction or failure */ - while (longest(v, d2, mid, end, (int *)NULL) != end) { - /* that midpoint didn't work, find a new one */ - if (mid == stop) { - /* all possibilities exhausted! */ - MDEBUG(("no midpoint!\n")); - freedfa(d); - freedfa(d2); - return REG_ASSERT; - } - if (shorter) - mid = shortest(v, d, begin, mid+1, end, (chr **)NULL, - (int *)NULL); - else - mid = longest(v, d, begin, mid-1, (int *)NULL); - if (mid == NULL) { - /* failed to find a new one! */ - MDEBUG(("failed midpoint!\n")); - freedfa(d); - freedfa(d2); - return REG_ASSERT; - } - MDEBUG(("new midpoint %ld\n", LOFF(mid))); - } - - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - i = dissect(v, t->left, begin, mid); - if (i != REG_OKAY) - return i; - return dissect(v, t->right, mid, end); -} - -/* - - altdissect - determine alternative subexpression matches (uncomplicated) - ^ static int altdissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -altdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ -{ - struct dfa *d; - int i; - - assert(t != NULL); - assert(t->op == '|'); - - for (i = 0; t != NULL; t = t->right, i++) { - MDEBUG(("trying %dth\n", i)); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); - if (ISERR()) - return v->err; - if (longest(v, d, begin, end, (int *)NULL) == end) { - MDEBUG(("success\n")); - freedfa(d); - return dissect(v, t->left, begin, end); - } - freedfa(d); - } - return REG_ASSERT; /* none of them matched?!? */ -} - -/* - - cdissect - determine subexpression matches (with complications) - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". - ^ static int cdissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -cdissect(v, t, begin, end) -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)); - - switch (t->op) { - case '=': /* terminal node */ - assert(t->left == NULL && t->right == NULL); - return REG_OKAY; /* no action, parent did the work */ - break; - case '|': /* alternation */ - assert(t->left != NULL); - return caltdissect(v, t, begin, end); - break; - case 'b': /* back ref -- shouldn't be calling us! */ - assert(t->left == NULL && t->right == NULL); - return cbrdissect(v, t, begin, end); - break; - case '.': /* concatenation */ - assert(t->left != NULL && t->right != NULL); - return ccondissect(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); - return er; - break; - default: - return REG_ASSERT; - break; - } -} - -/* - - ccondissect - concatenation subexpression matches (with complications) - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". - ^ static int ccondissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -ccondissect(v, t, begin, end) -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); - - if (t->left->flags&SHORTER) /* reverse scan */ - return crevdissect(v, t, begin, end); - - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) { - freedfa(d); - return v->err; - } - MDEBUG(("cconcat %d\n", t->retry)); - - /* pick a tentative midpoint */ - if (v->mem[t->retry] == 0) { - mid = longest(v, d, begin, end, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - } else { - mid = begin + (v->mem[t->retry] - 1); - MDEBUG(("working midpoint %ld\n", LOFF(mid))); - } - - /* iterate until satisfaction or failure */ - for (;;) { - /* try this midpoint on for size */ - er = cdissect(v, t->left, begin, mid); - if (er == REG_OKAY && - longest(v, d2, mid, end, (int *)NULL) == end && - (er = cdissect(v, t->right, mid, end)) == - REG_OKAY) - break; /* NOTE BREAK OUT */ - if (er != REG_OKAY && er != REG_NOMATCH) { - freedfa(d); - freedfa(d2); - return er; - } - - /* that midpoint didn't work, find a new one */ - if (mid == begin) { - /* all possibilities exhausted */ - MDEBUG(("%d no midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - 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->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - zapmem(v, t->left); - zapmem(v, t->right); - } - - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - return REG_OKAY; -} - -/* - - crevdissect - determine backref shortest-first subexpression matches - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". - ^ static int crevdissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -crevdissect(v, t, begin, end) -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); - - /* concatenation -- need to split the substring between parts */ - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) { - freedfa(d); - return v->err; - } - MDEBUG(("crev %d\n", t->retry)); - - /* pick a tentative midpoint */ - if (v->mem[t->retry] == 0) { - mid = shortest(v, d, begin, begin, end, (chr **)NULL, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - } else { - mid = begin + (v->mem[t->retry] - 1); - MDEBUG(("working midpoint %ld\n", LOFF(mid))); - } - - /* iterate until satisfaction or failure */ - for (;;) { - /* try this midpoint on for size */ - er = cdissect(v, t->left, begin, mid); - if (er == REG_OKAY && - longest(v, d2, mid, end, (int *)NULL) == end && - (er = cdissect(v, t->right, mid, end)) == - REG_OKAY) - break; /* NOTE BREAK OUT */ - if (er != REG_OKAY && er != REG_NOMATCH) { - freedfa(d); - freedfa(d2); - return er; - } - - /* that midpoint didn't work, find a new one */ - if (mid == end) { - /* all possibilities exhausted */ - MDEBUG(("%d no midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - 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->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - zapmem(v, t->left); - zapmem(v, t->right); - } - - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - return REG_OKAY; -} - -/* - - cbrdissect - determine backref subexpression matches - ^ static int cbrdissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -cbrdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ -{ - int i; - int n = t->subno; - size_t len; - chr *paren; - chr *p; - chr *stop; - 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->retry, n, min, max)); - - if (v->pmatch[n].rm_so == -1) - return REG_NOMATCH; - paren = v->start + v->pmatch[n].rm_so; - len = v->pmatch[n].rm_eo - v->pmatch[n].rm_so; - - /* no room to maneuver -- retries are pointless */ - if (v->mem[t->retry]) - return REG_NOMATCH; - v->mem[t->retry] = 1; - - /* special-case zero-length string */ - if (len == 0) { - if (begin == end) - return REG_OKAY; - return REG_NOMATCH; - } - - /* and too-short string */ - assert(end >= begin); - if ((size_t)(end - begin) < len) - return REG_NOMATCH; - stop = end - len; - - /* count occurrences */ - i = 0; - for (p = begin; p <= stop && (i < max || max == INFINITY); p += len) { - if ((*v->g->compare)(paren, p, len) != 0) - break; - i++; - } - MDEBUG(("cbackref found %d\n", i)); - - /* and sort it out */ - if (p != end) /* didn't consume all of it */ - return REG_NOMATCH; - if (min <= i && (i <= max || max == INFINITY)) - return REG_OKAY; - return REG_NOMATCH; /* out of range */ -} - -/* - - caltdissect - determine alternative subexpression matches (w. complications) - ^ static int caltdissect(struct vars *, struct subre *, chr *, chr *); - */ -static int /* regexec return code */ -caltdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ -{ - struct dfa *d; - int er; -# define UNTRIED 0 /* not yet tried at all */ -# define TRYING 1 /* top matched, trying submatches */ -# define TRIED 2 /* top didn't match or submatches exhausted */ - - if (t == NULL) - return REG_NOMATCH; - assert(t->op == '|'); - if (v->mem[t->retry] == TRIED) - return caltdissect(v, t->right, begin, end); - - MDEBUG(("calt n%d\n", t->retry)); - assert(t->left != NULL); - - if (v->mem[t->retry] == UNTRIED) { - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - if (longest(v, d, begin, end, (int *)NULL) != end) { - freedfa(d); - v->mem[t->retry] = TRIED; - return caltdissect(v, t->right, begin, end); - } - freedfa(d); - MDEBUG(("calt matched\n")); - v->mem[t->retry] = TRYING; - } - - er = cdissect(v, t->left, begin, end); - if (er != REG_NOMATCH) - return er; - - v->mem[t->retry] = TRIED; - return caltdissect(v, t->right, begin, end); -} - - - -#include "rege_dfa.c"