-#if defined(__MWERKS__) && !defined(__MACH__)
-typedef long off_t ;
-#else
-#include <sys/types.h>
-#endif
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-#include <limits.h>
-#include <stdlib.h>
-#include "regex.h"
-
-#include "utils.h"
-#include "regex2.h"
+/*
+ * re_*comp and friends - compile REs
+ * This file #includes several others (see the bottom).
+ *
+ * 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.
+ *
+ * $Header: /projects/cvsroot/pgsql-server/src/backend/regex/regcomp.c,v 1.38 2003/08/08 21:41:56 momjian Exp $
+ *
+ */
-#include "cclass.h"
-#include "cname.h"
+#include "regguts.h"
/*
- * parse structure, passed up and down to avoid global variables and
- * other clumsinesses
+ * forward declarations, up here so forward datatypes etc. are defined early
*/
-struct parse {
- char *next; /* next character in RE */
- char *end; /* end of string (-> NUL normally) */
- int error; /* has an error been seen? */
- sop *strip; /* malloced strip */
- sopno ssize; /* malloced strip size (allocated) */
- sopno slen; /* malloced strip length (used) */
- int ncsalloc; /* number of csets allocated */
- struct re_guts *g;
-# define NPAREN 10 /* we need to remember () 1-9 for back refs */
- sopno pbegin[NPAREN]; /* -> ( ([0] unused) */
- sopno pend[NPAREN]; /* -> ) ([0] unused) */
+/* === regcomp.c === */
+static void moresubs(struct vars *, int);
+static int freev(struct vars *, int);
+static void makesearch(struct vars *, struct nfa *);
+static struct subre *parse(struct vars *, int, int, struct state *, struct state *);
+static struct subre *parsebranch(struct vars *, int, int, struct state *, struct state *, int);
+static void parseqatom(struct vars *, int, int, struct state *, struct state *, struct subre *);
+static void nonword(struct vars *, int, struct state *, struct state *);
+static void word(struct vars *, int, struct state *, struct state *);
+static int scannum(struct vars *);
+static void repeat(struct vars *, struct state *, struct state *, int, int);
+static void bracket(struct vars *, struct state *, struct state *);
+static void cbracket(struct vars *, struct state *, struct state *);
+static void brackpart(struct vars *, struct state *, struct state *);
+static chr *scanplain(struct vars *);
+static void leaders(struct vars *, struct cvec *);
+static void onechr(struct vars *, chr, struct state *, struct state *);
+static void dovec(struct vars *, struct cvec *, struct state *, struct state *);
+static celt nextleader(struct vars *, chr, chr);
+static void wordchrs(struct vars *);
+static struct subre *subre(struct vars *, int, int, struct state *, struct state *);
+static void freesubre(struct vars *, struct subre *);
+static void freesrnode(struct vars *, struct subre *);
+static void optst(struct vars *, struct subre *);
+static int numst(struct subre *, int);
+static void markst(struct subre *);
+static void cleanst(struct vars *);
+static long nfatree(struct vars *, struct subre *, FILE *);
+static long nfanode(struct vars *, struct subre *, FILE *);
+static int newlacon(struct vars *, struct state *, struct state *, int);
+static void freelacons(struct subre *, int);
+static void rfree(regex_t *);
+
+#ifdef REG_DEBUG
+static void dump(regex_t *, FILE *);
+static void dumpst(struct subre *, FILE *, int);
+static void stdump(struct subre *, FILE *, int);
+static char *stid(struct subre *, char *, size_t);
+#endif
+/* === regc_lex.c === */
+static void lexstart(struct vars *);
+static void prefixes(struct vars *);
+static void lexnest(struct vars *, chr *, chr *);
+static void lexword(struct vars *);
+static int next(struct vars *);
+static int lexescape(struct vars *);
+static chr lexdigits(struct vars *, int, int, int);
+static int brenext(struct vars *, chr);
+static void skip(struct vars *);
+static chr newline(void);
+static chr chrnamed(struct vars *, chr *, chr *, chr);
+
+/* === regc_color.c === */
+static void initcm(struct vars *, struct colormap *);
+static void freecm(struct colormap *);
+static void cmtreefree(struct colormap *, union tree *, int);
+static color setcolor(struct colormap *, chr, pcolor);
+static color maxcolor(struct colormap *);
+static color newcolor(struct colormap *);
+static void freecolor(struct colormap *, pcolor);
+static color pseudocolor(struct colormap *);
+static color subcolor(struct colormap *, chr c);
+static color newsub(struct colormap *, pcolor);
+static void subrange(struct vars *, chr, chr, struct state *, struct state *);
+static void subblock(struct vars *, chr, struct state *, struct state *);
+static void okcolors(struct nfa *, struct colormap *);
+static void colorchain(struct colormap *, struct arc *);
+static void uncolorchain(struct colormap *, struct arc *);
+static int singleton(struct colormap *, chr c);
+static void rainbow(struct nfa *, struct colormap *, int, pcolor, struct state *, struct state *);
+static void colorcomplement(struct nfa *, struct colormap *, int, struct state *, struct state *, struct state *);
+
+#ifdef REG_DEBUG
+static void dumpcolors(struct colormap *, FILE *);
+static void fillcheck(struct colormap *, union tree *, int, FILE *);
+static void dumpchr(chr, FILE *);
+#endif
+/* === regc_nfa.c === */
+static struct nfa *newnfa(struct vars *, struct colormap *, struct nfa *);
+static void freenfa(struct nfa *);
+static struct state *newstate(struct nfa *);
+static struct state *newfstate(struct nfa *, int flag);
+static void dropstate(struct nfa *, struct state *);
+static void freestate(struct nfa *, struct state *);
+static void destroystate(struct nfa *, struct state *);
+static void newarc(struct nfa *, int, pcolor, struct state *, struct state *);
+static struct arc *allocarc(struct nfa *, struct state *);
+static void freearc(struct nfa *, struct arc *);
+static struct arc *findarc(struct state *, int, pcolor);
+static void cparc(struct nfa *, struct arc *, struct state *, struct state *);
+static void moveins(struct nfa *, struct state *, struct state *);
+static void copyins(struct nfa *, struct state *, struct state *);
+static void moveouts(struct nfa *, struct state *, struct state *);
+static void copyouts(struct nfa *, struct state *, struct state *);
+static void cloneouts(struct nfa *, struct state *, struct state *, struct state *, int);
+static void delsub(struct nfa *, struct state *, struct state *);
+static void deltraverse(struct nfa *, struct state *, struct state *);
+static void dupnfa(struct nfa *, struct state *, struct state *, struct state *, struct state *);
+static void duptraverse(struct nfa *, struct state *, struct state *);
+static void cleartraverse(struct nfa *, struct state *);
+static void specialcolors(struct nfa *);
+static long optimize(struct nfa *, FILE *);
+static void pullback(struct nfa *, FILE *);
+static int pull(struct nfa *, struct arc *);
+static void pushfwd(struct nfa *, FILE *);
+static int push(struct nfa *, struct arc *);
+
+#define INCOMPATIBLE 1 /* destroys arc */
+#define SATISFIED 2 /* constraint satisfied */
+#define COMPATIBLE 3 /* compatible but not satisfied yet */
+static int combine(struct arc *, struct arc *);
+static void fixempties(struct nfa *, FILE *);
+static int unempty(struct nfa *, struct arc *);
+static void cleanup(struct nfa *);
+static void markreachable(struct nfa *, struct state *, struct state *, struct state *);
+static void markcanreach(struct nfa *, struct state *, struct state *, struct state *);
+static long analyze(struct nfa *);
+static void compact(struct nfa *, struct cnfa *);
+static void carcsort(struct carc *, struct carc *);
+static void freecnfa(struct cnfa *);
+static void dumpnfa(struct nfa *, FILE *);
+
+#ifdef REG_DEBUG
+static void dumpstate(struct state *, FILE *);
+static void dumparcs(struct state *, FILE *);
+static int dumprarcs(struct arc *, struct state *, FILE *, int);
+static void dumparc(struct arc *, struct state *, FILE *);
+static void dumpcnfa(struct cnfa *, FILE *);
+static void dumpcstate(int, struct carc *, struct cnfa *, FILE *);
+#endif
+/* === regc_cvec.c === */
+static struct cvec *newcvec(int, int, int);
+static struct cvec *clearcvec(struct cvec *);
+static void addchr(struct cvec *, chr);
+static void addrange(struct cvec *, chr, chr);
+static void addmcce(struct cvec *, chr *, chr *);
+static int haschr(struct cvec *, chr);
+static struct cvec *getcvec(struct vars *, int, int, int);
+static void freecvec(struct cvec *);
+
+/* === regc_locale.c === */
+static int wx_isdigit(wx_wchar c);
+static int wx_isalpha(wx_wchar c);
+static int wx_isalnum(wx_wchar c);
+static int wx_isupper(wx_wchar c);
+static int wx_islower(wx_wchar c);
+static int wx_isgraph(wx_wchar c);
+static int wx_ispunct(wx_wchar c);
+static int wx_isspace(wx_wchar c);
+static wx_wchar wx_toupper(wx_wchar c);
+static wx_wchar wx_tolower(wx_wchar c);
+static int nmcces(struct vars *);
+static int nleaders(struct vars *);
+static struct cvec *allmcces(struct vars *, struct cvec *);
+static celt element(struct vars *, chr *, chr *);
+static struct cvec *range(struct vars *, celt, celt, int);
+static int before(celt, celt);
+static struct cvec *eclass(struct vars *, celt, int);
+static struct cvec *cclass(struct vars *, chr *, chr *, int);
+static struct cvec *allcases(struct vars *, chr);
+static int cmp(const chr *, const chr *, size_t);
+static int casecmp(const chr *, const chr *, size_t);
+
+
+/* internal variables, bundled for easy passing around */
+struct vars
+{
+ regex_t *re;
+ chr *now; /* scan pointer into string */
+ chr *stop; /* end of string */
+ chr *savenow; /* saved now and stop for "subroutine
+ * call" */
+ chr *savestop;
+ int err; /* error code (0 if none) */
+ int cflags; /* copy of compile flags */
+ int lasttype; /* type of previous token */
+ int nexttype; /* type of next token */
+ chr nextvalue; /* value (if any) of next token */
+ int lexcon; /* lexical context type (see lex.c) */
+ int nsubexp; /* subexpression count */
+ struct subre **subs; /* subRE pointer vector */
+ size_t nsubs; /* length of vector */
+ struct subre *sub10[10]; /* initial vector, enough for most */
+ struct nfa *nfa; /* the NFA */
+ struct colormap *cm; /* character color map */
+ color nlcolor; /* color of newline */
+ struct state *wordchrs; /* state in nfa holding word-char outarcs */
+ struct subre *tree; /* subexpression tree */
+ struct subre *treechain; /* all tree nodes allocated */
+ struct subre *treefree; /* any free tree nodes */
+ int ntree; /* number of tree nodes */
+ struct cvec *cv; /* interface cvec */
+ struct cvec *cv2; /* utility cvec */
+ struct cvec *mcces; /* collating-element information */
+#define ISCELEADER(v,c) (v->mcces != NULL && haschr(v->mcces, (c)))
+ struct state *mccepbegin; /* in nfa, start of MCCE prototypes */
+ struct state *mccepend; /* in nfa, end of MCCE prototypes */
+ struct subre *lacons; /* lookahead-constraint vector */
+ int nlacons; /* size of lacons */
};
-#include "regcomp.ih"
+/* parsing macros; most know that `v' is the struct vars pointer */
+#define NEXT() (next(v)) /* advance by one token */
+#define SEE(t) (v->nexttype == (t)) /* is next token this? */
+#define EAT(t) (SEE(t) && next(v)) /* if next is this, swallow it */
+#define VISERR(vv) ((vv)->err != 0) /* have we seen an error yet? */
+#define ISERR() VISERR(v)
+#define VERR(vv,e) ((vv)->nexttype = EOS, ((vv)->err) ? (vv)->err :\
+ ((vv)->err = (e)))
+#define ERR(e) VERR(v, e) /* record an error */
+#define NOERR() {if (ISERR()) return;} /* if error seen, return */
+#define NOERRN() {if (ISERR()) return NULL;} /* NOERR with retval */
+#define NOERRZ() {if (ISERR()) return 0;} /* NOERR with retval */
+#define INSIST(c, e) ((c) ? 0 : ERR(e)) /* if condition false,
+ * error */
+#define NOTE(b) (v->re->re_info |= (b)) /* note visible condition */
+#define EMPTYARC(x, y) newarc(v->nfa, EMPTY, 0, x, y)
+
+/* token type codes, some also used as NFA arc types */
+#define EMPTY 'n' /* no token present */
+#define EOS 'e' /* end of string */
+#define PLAIN 'p' /* ordinary character */
+#define DIGIT 'd' /* digit (in bound) */
+#define BACKREF 'b' /* back reference */
+#define COLLEL 'I' /* start of [. */
+#define ECLASS 'E' /* start of [= */
+#define CCLASS 'C' /* start of [: */
+#define END 'X' /* end of [. [= [: */
+#define RANGE 'R' /* - within [] which might be range delim. */
+#define LACON 'L' /* lookahead constraint subRE */
+#define AHEAD 'a' /* color-lookahead arc */
+#define BEHIND 'r' /* color-lookbehind arc */
+#define WBDRY 'w' /* word boundary constraint */
+#define NWBDRY 'W' /* non-word-boundary constraint */
+#define SBEGIN 'A' /* beginning of string (even if not BOL) */
+#define SEND 'Z' /* end of string (even if not EOL) */
+#define PREFER 'P' /* length preference */
+
+/* is an arc colored, and hence on a color chain? */
+#define COLORED(a) ((a)->type == PLAIN || (a)->type == AHEAD || \
+ (a)->type == BEHIND)
+
+
+
+/* static function list */
+static struct fns functions = {
+ rfree, /* regfree insides */
+};
-static char nuls[10]; /* place to point scanner in event of error */
-/*
- * macros for use with parse structure
- * BEWARE: these know that the parse structure is named `p' !!!
- */
-#define PEEK() (*p->next)
-#define PEEK2() (*(p->next+1))
-#define MORE() (p->next < p->end)
-#define MORE2() (p->next+1 < p->end)
-#define SEE(c) (MORE() && PEEK() == (c))
-#define SEETWO(a, b) (MORE() && MORE2() && PEEK() == (a) && PEEK2() == (b))
-#define EAT(c) ((SEE(c)) ? (NEXT(), 1) : 0)
-#define EATTWO(a, b) ((SEETWO(a, b)) ? (NEXT2(), 1) : 0)
-#define NEXT() (p->next++)
-#define NEXT2() (p->next += 2)
-#define NEXTn(n) (p->next += (n))
-#define GETNEXT() (*p->next++)
-#define SETERROR(e) seterr(p, (e))
-#define REQUIRE(co, e) ((void)((co) || SETERROR(e)))
-#define MUSTSEE(c, e) (REQUIRE(MORE() && PEEK() == (c), e))
-#define MUSTEAT(c, e) (REQUIRE(MORE() && GETNEXT() == (c), e))
-#define MUSTNOTSEE(c, e) (REQUIRE(!MORE() || PEEK() != (c), e))
-#define EMIT(op, sopnd) doemit(p, (sop)(op), (size_t)(sopnd))
-#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos)
-#define AHEAD(pos) dofwd(p, pos, HERE()-(pos))
-#define ASTERN(sop, pos) EMIT(sop, HERE()-pos)
-#define HERE() (p->slen)
-#define THERE() (p->slen - 1)
-#define THERETHERE() (p->slen - 2)
-#define DROP(n) (p->slen -= (n))
-
-#ifndef NDEBUG
-static int never = 0; /* for use in asserts; shuts lint up */
-#else
-#define never 0 /* some <assert.h>s have bugs too */
-#endif
/*
- - regcomp - interface for parser and compilation
- = extern int regcomp(regex_t *, const char *, int);
- = #define REG_BASIC 0000
- = #define REG_EXTENDED 0001
- = #define REG_ICASE 0002
- = #define REG_NOSUB 0004
- = #define REG_NEWLINE 0010
- = #define REG_NOSPEC 0020
- = #define REG_PEND 0040
- = #define REG_DUMP 0200
+ * regcomp - compile regular expression
*/
-int /* 0 success, otherwise REG_something */
-regcomp(preg, pattern, cflags)
-regex_t *preg;
-const char *pattern;
-int cflags;
+int
+regcomp(regex_t *re,
+ const chr *string,
+ int flags)
{
- struct parse pa;
- register struct re_guts *g;
- register struct parse *p = &pa;
- register int i;
- register size_t len;
-#ifdef REDEBUG
-# define GOODFLAGS(f) (f)
-#else
-# define GOODFLAGS(f) ((f)&~REG_DUMP)
-#endif
+
+ size_t nLen = 0;
+ chr* s2 = (chr*) string;
- cflags = GOODFLAGS(cflags);
- if ((cflags®_EXTENDED) && (cflags®_NOSPEC))
- return(REG_INVARG);
-
- if (cflags®_PEND) {
- if (preg->re_endp < pattern)
- return(REG_INVARG);
- len = preg->re_endp - pattern;
- } else
- len = strlen((char *)pattern);
-
- /* do the mallocs early so failure handling is easy */
- g = (struct re_guts *)malloc(sizeof(struct re_guts) +
- (NC-1)*sizeof(cat_t));
- if (g == NULL)
- return(REG_ESPACE);
- p->ssize = len/(size_t)2*(size_t)3 + (size_t)1; /* ugh */
- p->strip = (sop *)malloc(p->ssize * sizeof(sop));
- p->slen = 0;
- if (p->strip == NULL) {
- free((char *)g);
- return(REG_ESPACE);
- }
+ if (string && *string)
+ {
+ while(*++s2);
+ }
- /* set things up */
- p->g = g;
- p->next = (char *)pattern; /* convenience; we do not modify it */
- p->end = p->next + len;
- p->error = 0;
- p->ncsalloc = 0;
- for (i = 0; i < NPAREN; i++) {
- p->pbegin[i] = 0;
- p->pend[i] = 0;
- }
- g->csetsize = NC;
- g->sets = NULL;
- g->setbits = NULL;
- g->ncsets = 0;
- g->cflags = cflags;
- g->iflags = 0;
- g->nbol = 0;
- g->neol = 0;
- g->must = NULL;
- g->mlen = 0;
- g->nsub = 0;
- g->ncategories = 1; /* category 0 is "everything else" */
- g->categories = &g->catspace[-(CHAR_MIN)];
- (void) memset((char *)g->catspace, 0, NC*sizeof(cat_t));
- g->backrefs = 0;
-
- /* do it */
- EMIT(OEND, 0);
- g->firststate = THERE();
- if (cflags®_EXTENDED)
- p_ere(p, OUT);
- else if (cflags®_NOSPEC)
- p_str(p);
- else
- p_bre(p, OUT, OUT);
- EMIT(OEND, 0);
- g->laststate = THERE();
-
- /* tidy up loose ends and fill things in */
- categorize(p, g);
- stripsnug(p, g);
- findmust(p, g);
- g->nplus = pluscount(p, g);
- g->magic = MAGIC2;
- preg->re_nsub = g->nsub;
- preg->re_g = g;
- preg->re_magic = MAGIC1;
-#ifndef REDEBUG
- /* not debugging, so can't rely on the assert() in regexec() */
- if (g->iflags&BAD)
- SETERROR(REG_ASSERT);
-#endif
+ nLen = ((s2 - string) / sizeof(chr));
- /* win or lose, we're done */
- if (p->error != 0) /* lose */
- regfree(preg);
- return(p->error);
+ return wx_regcomp(re, string, nLen, flags);
}
-
-/*
- - p_ere - ERE parser top level, concatenation and alternation
- == static void p_ere(register struct parse *p, int stop);
- */
-static void
-p_ere(p, stop)
-register struct parse *p;
-int stop; /* character this ERE should end at */
+int
+wx_regcomp(regex_t *re,
+ const chr *string,
+ size_t len,
+ int flags)
{
- register char c;
- register sopno prevback;
- register sopno prevfwd;
- register sopno conc;
- register int first = 1; /* is this the first alternative? */
-
- for (;;) {
- /* do a bunch of concatenated expressions */
- conc = HERE();
- while (MORE() && (c = PEEK()) != '|' && c != stop)
- p_ere_exp(p);
- REQUIRE(HERE() != conc, REG_EMPTY); /* require nonempty */
-
- if (!EAT('|'))
- break; /* NOTE BREAK OUT */
-
- if (first) {
- INSERT(OCH_, conc); /* offset is wrong */
- prevfwd = conc;
- prevback = conc;
- first = 0;
+ struct vars var;
+ struct vars *v = &var;
+ struct guts *g;
+ int i;
+ size_t j;
+
+#ifdef REG_DEBUG
+ FILE *debug = (flags & REG_PROGRESS) ? stdout : (FILE *) NULL;
+
+#else
+ FILE *debug = (FILE *) NULL;
+#endif
+
+#define CNOERR() { if (ISERR()) return freev(v, v->err); }
+
+ /* sanity checks */
+
+ if (re == NULL || string == NULL)
+ return REG_INVARG;
+ if ((flags & REG_QUOTE) &&
+ (flags & (REG_ADVANCED | REG_EXPANDED | REG_NEWLINE)))
+ return REG_INVARG;
+ if (!(flags & REG_EXTENDED) && (flags & REG_ADVF))
+ return REG_INVARG;
+
+ /* initial setup (after which freev() is callable) */
+ v->re = re;
+ v->now = (chr *) string;
+ v->stop = v->now + len;
+ v->savenow = v->savestop = NULL;
+ v->err = 0;
+ v->cflags = flags;
+ v->nsubexp = 0;
+ v->subs = v->sub10;
+ v->nsubs = 10;
+ for (j = 0; j < v->nsubs; j++)
+ v->subs[j] = NULL;
+ v->nfa = NULL;
+ v->cm = NULL;
+ v->nlcolor = COLORLESS;
+ v->wordchrs = NULL;
+ v->tree = NULL;
+ v->treechain = NULL;
+ v->treefree = NULL;
+ v->cv = NULL;
+ v->cv2 = NULL;
+ v->mcces = NULL;
+ v->lacons = NULL;
+ v->nlacons = 0;
+ re->re_magic = REMAGIC;
+ re->re_info = 0; /* bits get set during parse */
+ re->re_csize = sizeof(chr);
+ re->re_guts = NULL;
+ re->re_fns = VS(&functions);
+
+ /* more complex setup, malloced things */
+ re->re_guts = VS(MALLOC(sizeof(struct guts)));
+ if (re->re_guts == NULL)
+ return freev(v, REG_ESPACE);
+ g = (struct guts *) re->re_guts;
+ g->tree = NULL;
+ initcm(v, &g->cmap);
+ v->cm = &g->cmap;
+ g->lacons = NULL;
+ g->nlacons = 0;
+ ZAPCNFA(g->search);
+ v->nfa = newnfa(v, v->cm, (struct nfa *) NULL);
+ CNOERR();
+ v->cv = newcvec(100, 20, 10);
+ if (v->cv == NULL)
+ return freev(v, REG_ESPACE);
+ i = nmcces(v);
+ if (i > 0)
+ {
+ v->mcces = newcvec(nleaders(v), 0, i);
+ CNOERR();
+ v->mcces = allmcces(v, v->mcces);
+ leaders(v, v->mcces);
+ addmcce(v->mcces, (chr *) NULL, (chr *) NULL); /* dummy */
+ }
+ CNOERR();
+
+ /* parsing */
+ lexstart(v); /* also handles prefixes */
+ if ((v->cflags & REG_NLSTOP) || (v->cflags & REG_NLANCH))
+ {
+ /* assign newline a unique color */
+ v->nlcolor = subcolor(v->cm, newline());
+ okcolors(v->nfa, v->cm);
+ }
+ CNOERR();
+ v->tree = parse(v, EOS, PLAIN, v->nfa->init, v->nfa->final);
+ assert(SEE(EOS)); /* even if error; ISERR() => SEE(EOS) */
+ CNOERR();
+ assert(v->tree != NULL);
+
+ /* finish setup of nfa and its subre tree */
+ specialcolors(v->nfa);
+ CNOERR();
+#ifdef REG_DEBUG
+ if (debug != NULL)
+ {
+ fprintf(debug, "\n\n\n========= RAW ==========\n");
+ dumpnfa(v->nfa, debug);
+ dumpst(v->tree, debug, 1);
}
- ASTERN(OOR1, prevback);
- prevback = THERE();
- AHEAD(prevfwd); /* fix previous offset */
- prevfwd = HERE();
- EMIT(OOR2, 0); /* offset is very wrong */
+#endif
+ optst(v, v->tree);
+ v->ntree = numst(v->tree, 1);
+ markst(v->tree);
+ cleanst(v);
+#ifdef REG_DEBUG
+ if (debug != NULL)
+ {
+ fprintf(debug, "\n\n\n========= TREE FIXED ==========\n");
+ dumpst(v->tree, debug, 1);
}
+#endif
- if (!first) { /* tail-end fixups */
- AHEAD(prevfwd);
- ASTERN(O_CH, prevback);
+ /* build compacted NFAs for tree and lacons */
+ re->re_info |= nfatree(v, v->tree, debug);
+ CNOERR();
+ assert(v->nlacons == 0 || v->lacons != NULL);
+ for (i = 1; i < v->nlacons; i++)
+ {
+#ifdef REG_DEBUG
+ if (debug != NULL)
+ fprintf(debug, "\n\n\n========= LA%d ==========\n", i);
+#endif
+ nfanode(v, &v->lacons[i], debug);
}
+ CNOERR();
+ if (v->tree->flags & SHORTER)
+ NOTE(REG_USHORTEST);
+
+ /* build compacted NFAs for tree, lacons, fast search */
+#ifdef REG_DEBUG
+ if (debug != NULL)
+ fprintf(debug, "\n\n\n========= SEARCH ==========\n");
+#endif
+ /* can sacrifice main NFA now, so use it as work area */
+ (DISCARD) optimize(v->nfa, debug);
+ CNOERR();
+ makesearch(v, v->nfa);
+ CNOERR();
+ compact(v->nfa, &g->search);
+ CNOERR();
+
+ /* looks okay, package it up */
+ re->re_nsub = v->nsubexp;
+ v->re = NULL; /* freev no longer frees re */
+ g->magic = GUTSMAGIC;
+ g->cflags = v->cflags;
+ g->info = re->re_info;
+ g->nsub = re->re_nsub;
+ g->tree = v->tree;
+ v->tree = NULL;
+ g->ntree = v->ntree;
+ g->compare = (v->cflags & REG_ICASE) ? casecmp : cmp;
+ g->lacons = v->lacons;
+ v->lacons = NULL;
+ g->nlacons = v->nlacons;
+
+#ifdef REG_DEBUG
+ if (flags & REG_DUMP)
+ dump(re, stdout);
+#endif
- assert(!MORE() || SEE(stop));
+ assert(v->err == 0);
+ return freev(v, 0);
}
/*
- - p_ere_exp - parse one subERE, an atom possibly followed by a repetition op
- == static void p_ere_exp(register struct parse *p);
+ * moresubs - enlarge subRE vector
*/
static void
-p_ere_exp(p)
-register struct parse *p;
+moresubs(struct vars * v,
+ int wanted) /* want enough room for this one */
{
- register char c;
- register sopno pos;
- register int count;
- register int count2;
- register sopno subno;
- int wascaret = 0;
-
- assert(MORE()); /* caller should have ensured this */
- c = GETNEXT();
-
- pos = HERE();
- switch (c) {
- case '(':
- REQUIRE(MORE(), REG_EPAREN);
- p->g->nsub++;
- subno = p->g->nsub;
- if (subno < NPAREN)
- p->pbegin[subno] = HERE();
- EMIT(OLPAREN, subno);
- if (!SEE(')'))
- p_ere(p, ')');
- if (subno < NPAREN) {
- p->pend[subno] = HERE();
- assert(p->pend[subno] != 0);
+ struct subre **p;
+ size_t n;
+
+ assert(wanted > 0 && (size_t) wanted >= v->nsubs);
+ n = (size_t) wanted *3 / 2 + 1;
+
+ if (v->subs == v->sub10)
+ {
+ p = (struct subre **) MALLOC(n * sizeof(struct subre *));
+ if (p != NULL)
+ memcpy(VS(p), VS(v->subs),
+ v->nsubs * sizeof(struct subre *));
}
- EMIT(ORPAREN, subno);
- MUSTEAT(')', REG_EPAREN);
- break;
-#ifndef POSIX_MISTAKE
- case ')': /* happens only if no current unmatched ( */
- /*
- * You may ask, why the ifndef? Because I didn't notice
- * this until slightly too late for 1003.2, and none of the
- * other 1003.2 regular-expression reviewers noticed it at
- * all. So an unmatched ) is legal POSIX, at least until
- * we can get it fixed.
- */
- SETERROR(REG_EPAREN);
- break;
-#endif
- case '^':
- EMIT(OBOL, 0);
- p->g->iflags |= USEBOL;
- p->g->nbol++;
- wascaret = 1;
- break;
- case '$':
- EMIT(OEOL, 0);
- p->g->iflags |= USEEOL;
- p->g->neol++;
- break;
- case '|':
- SETERROR(REG_EMPTY);
- break;
- case '*':
- case '+':
- case '?':
- SETERROR(REG_BADRPT);
- break;
- case '.':
- if (p->g->cflags®_NEWLINE)
- nonnewline(p);
else
- EMIT(OANY, 0);
- break;
- case '[':
- p_bracket(p);
- break;
- case '\\':
- REQUIRE(MORE(), REG_EESCAPE);
- c = GETNEXT();
- ordinary(p, c);
- break;
- case '{': /* okay as ordinary except if digit follows */
- REQUIRE(!MORE() || !isdigit(PEEK()), REG_BADRPT);
- /* FALLTHROUGH */
- default:
- ordinary(p, c);
- break;
- }
-
- if (!MORE())
+ p = (struct subre **) REALLOC(v->subs, n * sizeof(struct subre *));
+ if (p == NULL)
+ {
+ ERR(REG_ESPACE);
return;
- c = PEEK();
- /* we call { a repetition if followed by a digit */
- if (!( c == '*' || c == '+' || c == '?' ||
- (c == '{' && MORE2() && isdigit(PEEK2())) ))
- return; /* no repetition, we're done */
- NEXT();
-
- REQUIRE(!wascaret, REG_BADRPT);
- switch (c) {
- case '*': /* implemented as +? */
- /* this case does not require the (y|) trick, noKLUDGE */
- INSERT(OPLUS_, pos);
- ASTERN(O_PLUS, pos);
- INSERT(OQUEST_, pos);
- ASTERN(O_QUEST, pos);
- break;
- case '+':
- INSERT(OPLUS_, pos);
- ASTERN(O_PLUS, pos);
- break;
- case '?':
- /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
- INSERT(OCH_, pos); /* offset slightly wrong */
- ASTERN(OOR1, pos); /* this one's right */
- AHEAD(pos); /* fix the OCH_ */
- EMIT(OOR2, 0); /* offset very wrong... */
- AHEAD(THERE()); /* ...so fix it */
- ASTERN(O_CH, THERETHERE());
- break;
- case '{':
- count = p_count(p);
- if (EAT(',')) {
- if (isdigit(PEEK())) {
- count2 = p_count(p);
- REQUIRE(count <= count2, REG_BADBR);
- } else /* single number with comma */
- count2 = INFINITY;
- } else /* just a single number */
- count2 = count;
- repeat(p, pos, count, count2);
- if (!EAT('}')) { /* error heuristics */
- while (MORE() && PEEK() != '}')
- NEXT();
- REQUIRE(MORE(), REG_EBRACE);
- SETERROR(REG_BADBR);
- }
- break;
}
-
- if (!MORE())
- return;
- c = PEEK();
- if (!( c == '*' || c == '+' || c == '?' ||
- (c == '{' && MORE2() && isdigit(PEEK2())) ) )
- return;
- SETERROR(REG_BADRPT);
+ v->subs = p;
+ for (p = &v->subs[v->nsubs]; v->nsubs < n; p++, v->nsubs++)
+ *p = NULL;
+ assert(v->nsubs == n);
+ assert((size_t) wanted < v->nsubs);
}
/*
- - p_str - string (no metacharacters) "parser"
- == static void p_str(register struct parse *p);
+ * freev - free vars struct's substructures where necessary
+ *
+ * Optionally does error-number setting, and always returns error code
+ * (if any), to make error-handling code terser.
*/
-static void
-p_str(p)
-register struct parse *p;
+static int
+freev(struct vars * v,
+ int err)
{
- REQUIRE(MORE(), REG_EMPTY);
- while (MORE())
- ordinary(p, GETNEXT());
+ if (v->re != NULL)
+ rfree(v->re);
+ if (v->subs != v->sub10)
+ FREE(v->subs);
+ if (v->nfa != NULL)
+ freenfa(v->nfa);
+ if (v->tree != NULL)
+ freesubre(v, v->tree);
+ if (v->treechain != NULL)
+ cleanst(v);
+ if (v->cv != NULL)
+ freecvec(v->cv);
+ if (v->cv2 != NULL)
+ freecvec(v->cv2);
+ if (v->mcces != NULL)
+ freecvec(v->mcces);
+ if (v->lacons != NULL)
+ freelacons(v->lacons, v->nlacons);
+ ERR(err); /* nop if err==0 */
+
+ return v->err;
}
/*
- - p_bre - BRE parser top level, anchoring and concatenation
- == static void p_bre(register struct parse *p, register int end1, \
- == register int end2);
- * Giving end1 as OUT essentially eliminates the end1/end2 check.
- *
- * This implementation is a bit of a kludge, in that a trailing $ is first
- * taken as an ordinary character and then revised to be an anchor. The
- * only undesirable side effect is that '$' gets included as a character
- * category in such cases. This is fairly harmless; not worth fixing.
- * The amount of lookahead needed to avoid this kludge is excessive.
+ * makesearch - turn an NFA into a search NFA (implicit prepend of .*?)
+ * NFA must have been optimize()d already.
*/
static void
-p_bre(p, end1, end2)
-register struct parse *p;
-register int end1; /* first terminating character */
-register int end2; /* second terminating character */
+makesearch(struct vars * v,
+ struct nfa * nfa)
{
- register sopno start = HERE();
- register int first = 1; /* first subexpression? */
- register int wasdollar = 0;
-
- if (EAT('^')) {
- EMIT(OBOL, 0);
- p->g->iflags |= USEBOL;
- p->g->nbol++;
- }
- while (MORE() && !SEETWO(end1, end2)) {
- wasdollar = p_simp_re(p, first);
- first = 0;
+ struct arc *a;
+ struct arc *b;
+ struct state *pre = nfa->pre;
+ struct state *s;
+ struct state *s2;
+ struct state *slist;
+
+ /* no loops are needed if it's anchored */
+ for (a = pre->outs; a != NULL; a = a->outchain)
+ {
+ assert(a->type == PLAIN);
+ if (a->co != nfa->bos[0] && a->co != nfa->bos[1])
+ break;
}
- if (wasdollar) { /* oops, that was a trailing anchor */
- DROP(1);
- EMIT(OEOL, 0);
- p->g->iflags |= USEEOL;
- p->g->neol++;
+ if (a != NULL)
+ {
+ /* add implicit .* in front */
+ rainbow(nfa, v->cm, PLAIN, COLORLESS, pre, pre);
+
+ /* and ^* and \A* too -- not always necessary, but harmless */
+ newarc(nfa, PLAIN, nfa->bos[0], pre, pre);
+ newarc(nfa, PLAIN, nfa->bos[1], pre, pre);
}
- REQUIRE(HERE() != start, REG_EMPTY); /* require nonempty */
-}
-
-/*
- - p_simp_re - parse a simple RE, an atom possibly followed by a repetition
- == static int p_simp_re(register struct parse *p, int starordinary);
+ /*
+ * Now here's the subtle part. Because many REs have no lookback
+ * constraints, often knowing when you were in the pre state tells you
+ * little; it's the next state(s) that are informative. But some of
+ * them may have other inarcs, i.e. it may be possible to make actual
+ * progress and then return to one of them. We must de-optimize such
+ * cases, splitting each such state into progress and no-progress
+ * states.
*/
-static int /* was the simple RE an unbackslashed $? */
-p_simp_re(p, starordinary)
-register struct parse *p;
-int starordinary; /* is a leading * an ordinary character? */
-{
- register int c;
- register int count;
- register int count2;
- register sopno pos;
- register int i;
- register sopno subno;
-# define BACKSL (1<<CHAR_BIT)
-
- pos = HERE(); /* repetion op, if any, covers from here */
-
- assert(MORE()); /* caller should have ensured this */
- c = GETNEXT();
- if (c == '\\') {
- REQUIRE(MORE(), REG_EESCAPE);
- c = BACKSL | (unsigned char)GETNEXT();
- }
- switch (c) {
- case '.':
- if (p->g->cflags®_NEWLINE)
- nonnewline(p);
- else
- EMIT(OANY, 0);
- break;
- case '[':
- p_bracket(p);
- break;
- case BACKSL|'{':
- SETERROR(REG_BADRPT);
- break;
- case BACKSL|'(':
- p->g->nsub++;
- subno = p->g->nsub;
- if (subno < NPAREN)
- p->pbegin[subno] = HERE();
- EMIT(OLPAREN, subno);
- /* the MORE here is an error heuristic */
- if (MORE() && !SEETWO('\\', ')'))
- p_bre(p, '\\', ')');
- if (subno < NPAREN) {
- p->pend[subno] = HERE();
- assert(p->pend[subno] != 0);
- }
- EMIT(ORPAREN, subno);
- REQUIRE(EATTWO('\\', ')'), REG_EPAREN);
- break;
- case BACKSL|')': /* should not get here -- must be user */
- case BACKSL|'}':
- SETERROR(REG_EPAREN);
- break;
- case BACKSL|'1':
- case BACKSL|'2':
- case BACKSL|'3':
- case BACKSL|'4':
- case BACKSL|'5':
- case BACKSL|'6':
- case BACKSL|'7':
- case BACKSL|'8':
- case BACKSL|'9':
- i = (c&~BACKSL) - '0';
- assert(i < NPAREN);
- if (p->pend[i] != 0) {
- assert(i <= p->g->nsub);
- EMIT(OBACK_, i);
- assert(p->pbegin[i] != 0);
- assert(OP(p->strip[p->pbegin[i]]) == OLPAREN);
- assert(OP(p->strip[p->pend[i]]) == ORPAREN);
- (void) dupl(p, p->pbegin[i]+1, p->pend[i]);
- EMIT(O_BACK, i);
- } else
- SETERROR(REG_ESUBREG);
- p->g->backrefs = 1;
- break;
- case '*':
- REQUIRE(starordinary, REG_BADRPT);
- /* FALLTHROUGH */
- default:
- ordinary(p, (char)c); /* takes off BACKSL, if any */
+
+ /* first, make a list of the states */
+ slist = NULL;
+ for (a = pre->outs; a != NULL; a = a->outchain)
+ {
+ s = a->to;
+ for (b = s->ins; b != NULL; b = b->inchain)
+ if (b->from != pre)
break;
+ if (b != NULL)
+ { /* must be split */
+ s->tmp = slist;
+ slist = s;
}
-
- if (EAT('*')) { /* implemented as +? */
- /* this case does not require the (y|) trick, noKLUDGE */
- INSERT(OPLUS_, pos);
- ASTERN(O_PLUS, pos);
- INSERT(OQUEST_, pos);
- ASTERN(O_QUEST, pos);
- } else if (EATTWO('\\', '{')) {
- count = p_count(p);
- if (EAT(',')) {
- if (MORE() && isdigit(PEEK())) {
- count2 = p_count(p);
- REQUIRE(count <= count2, REG_BADBR);
- } else /* single number with comma */
- count2 = INFINITY;
- } else /* just a single number */
- count2 = count;
- repeat(p, pos, count, count2);
- if (!EATTWO('\\', '}')) { /* error heuristics */
- while (MORE() && !SEETWO('\\', '}'))
- NEXT();
- REQUIRE(MORE(), REG_EBRACE);
- SETERROR(REG_BADBR);
}
- } else if (c == (unsigned char)'$') /* $ (but not \$) ends it */
- return(1);
- return(0);
+ /* do the splits */
+ for (s = slist; s != NULL; s = s2)
+ {
+ s2 = newstate(nfa);
+ copyouts(nfa, s, s2);
+ for (a = s->ins; a != NULL; a = b)
+ {
+ b = a->inchain;
+ if (a->from != pre)
+ {
+ cparc(nfa, a, a->from, s2);
+ freearc(nfa, a);
+ }
+ }
+ s2 = s->tmp;
+ s->tmp = NULL; /* clean up while we're at it */
+ }
}
/*
- - p_count - parse a repetition count
- == static int p_count(register struct parse *p);
+ * parse - parse an RE
+ *
+ * This is actually just the top level, which parses a bunch of branches
+ * tied together with '|'. They appear in the tree as the left children
+ * of a chain of '|' subres.
*/
-static int /* the value */
-p_count(p)
-register struct parse *p;
+static struct subre *
+parse(struct vars * v,
+ int stopper, /* EOS or ')' */
+ int type, /* LACON (lookahead subRE) or PLAIN */
+ struct state * init, /* initial state */
+ struct state * final) /* final state */
{
- register int count = 0;
- register int ndigits = 0;
+ struct state *left; /* scaffolding for branch */
+ struct state *right;
+ struct subre *branches; /* top level */
+ struct subre *branch; /* current branch */
+ struct subre *t; /* temporary */
+ int firstbranch; /* is this the first branch? */
+
+ assert(stopper == ')' || stopper == EOS);
+
+ branches = subre(v, '|', LONGER, init, final);
+ NOERRN();
+ branch = branches;
+ firstbranch = 1;
+ do
+ { /* a branch */
+ if (!firstbranch)
+ {
+ /* need a place to hang it */
+ branch->right = subre(v, '|', LONGER, init, final);
+ NOERRN();
+ branch = branch->right;
+ }
+ firstbranch = 0;
+ left = newstate(v->nfa);
+ right = newstate(v->nfa);
+ NOERRN();
+ EMPTYARC(init, left);
+ EMPTYARC(right, final);
+ NOERRN();
+ branch->left = parsebranch(v, stopper, type, left, right, 0);
+ NOERRN();
+ branch->flags |= UP(branch->flags | branch->left->flags);
+ if ((branch->flags & ~branches->flags) != 0) /* new flags */
+ for (t = branches; t != branch; t = t->right)
+ t->flags |= branch->flags;
+ } while (EAT('|'));
+ assert(SEE(stopper) || SEE(EOS));
+
+ if (!SEE(stopper))
+ {
+ assert(stopper == ')' && SEE(EOS));
+ ERR(REG_EPAREN);
+ }
- while (MORE() && isdigit(PEEK()) && count <= DUPMAX) {
- count = count*10 + (GETNEXT() - '0');
- ndigits++;
+ /* optimize out simple cases */
+ if (branch == branches)
+ { /* only one branch */
+ assert(branch->right == NULL);
+ t = branch->left;
+ branch->left = NULL;
+ freesubre(v, branches);
+ branches = t;
+ }
+ else if (!MESSY(branches->flags))
+ { /* no interesting innards */
+ freesubre(v, branches->left);
+ branches->left = NULL;
+ freesubre(v, branches->right);
+ branches->right = NULL;
+ branches->op = '=';
}
- REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR);
- return(count);
+ return branches;
}
/*
- - p_bracket - parse a bracketed character list
- == static void p_bracket(register struct parse *p);
+ * parsebranch - parse one branch of an RE
*
- * Note a significant property of this code: if the allocset() did SETERROR,
- * no set operations are done.
+ * This mostly manages concatenation, working closely with parseqatom().
+ * Concatenated things are bundled up as much as possible, with separate
+ * ',' nodes introduced only when necessary due to substructure.
*/
-static void
-p_bracket(p)
-register struct parse *p;
+static struct subre *
+parsebranch(struct vars * v,
+ int stopper, /* EOS or ')' */
+ int type, /* LACON (lookahead subRE) or PLAIN */
+ struct state * left, /* leftmost state */
+ struct state * right, /* rightmost state */
+ int partial) /* is this only part of a branch? */
{
- register cset *cs = allocset(p);
- register int invert = 0;
-
- /* Dept of Truly Sickening Special-Case Kludges */
- if (p->next + 5 < p->end && strncmp(p->next, "[:<:]]", 6) == 0) {
- EMIT(OBOW, 0);
- NEXTn(6);
- return;
- }
- if (p->next + 5 < p->end && strncmp(p->next, "[:>:]]", 6) == 0) {
- EMIT(OEOW, 0);
- NEXTn(6);
- return;
+ struct state *lp; /* left end of current construct */
+ int seencontent; /* is there anything in this branch yet? */
+ struct subre *t;
+
+ lp = left;
+ seencontent = 0;
+ t = subre(v, '=', 0, left, right); /* op '=' is tentative */
+ NOERRN();
+ while (!SEE('|') && !SEE(stopper) && !SEE(EOS))
+ {
+ if (seencontent)
+ { /* implicit concat operator */
+ lp = newstate(v->nfa);
+ NOERRN();
+ moveins(v->nfa, right, lp);
}
+ seencontent = 1;
- if (EAT('^'))
- invert++; /* make note to invert set at end */
- if (EAT(']'))
- CHadd(cs, ']');
- else if (EAT('-'))
- CHadd(cs, '-');
- while (MORE() && PEEK() != ']' && !SEETWO('-', ']'))
- p_b_term(p, cs);
- if (EAT('-'))
- CHadd(cs, '-');
- MUSTEAT(']', REG_EBRACK);
-
- if (p->error != 0) /* don't mess things up further */
- return;
-
- if (p->g->cflags®_ICASE) {
- register int i;
- register int ci;
-
- for (i = p->g->csetsize - 1; i >= 0; i--)
- if (CHIN(cs, i) && isalpha(i)) {
- ci = othercase(i);
- if (ci != i)
- CHadd(cs, ci);
- }
- if (cs->multis != NULL)
- mccase(p, cs);
+ /* NB, recursion in parseqatom() may swallow rest of branch */
+ parseqatom(v, stopper, type, lp, right, t);
}
- if (invert) {
- register int i;
- for (i = p->g->csetsize - 1; i >= 0; i--)
- if (CHIN(cs, i))
- CHsub(cs, i);
- else
- CHadd(cs, i);
- if (p->g->cflags®_NEWLINE)
- CHsub(cs, '\n');
- if (cs->multis != NULL)
- mcinvert(p, cs);
+ if (!seencontent)
+ { /* empty branch */
+ if (!partial)
+ NOTE(REG_UUNSPEC);
+ assert(lp == left);
+ EMPTYARC(left, right);
}
- assert(cs->multis == NULL); /* xxx */
-
- if (nch(p, cs) == 1) { /* optimize singleton sets */
- ordinary(p, firstch(p, cs));
- freeset(p, cs);
- } else
- EMIT(OANYOF, freezeset(p, cs));
+ return t;
}
/*
- - p_b_term - parse one term of a bracketed character list
- == static void p_b_term(register struct parse *p, register cset *cs);
+ * parseqatom - parse one quantified atom or constraint of an RE
+ *
+ * The bookkeeping near the end cooperates very closely with parsebranch();
+ * in particular, it contains a recursion that can involve parsing the rest
+ * of the branch, making this function's name somewhat inaccurate.
*/
static void
-p_b_term(p, cs)
-register struct parse *p;
-register cset *cs;
+parseqatom(struct vars * v,
+ int stopper, /* EOS or ')' */
+ int type, /* LACON (lookahead subRE) or PLAIN */
+ struct state * lp, /* left state to hang it on */
+ struct state * rp, /* right state to hang it on */
+ struct subre * top) /* subtree top */
{
- register char c;
- register char start, finish;
- register int i;
-
- /* classify what we've got */
- switch ((MORE()) ? PEEK() : '\0') {
- case '[':
- c = (MORE2()) ? PEEK2() : '\0';
+ struct state *s; /* temporaries for new states */
+ struct state *s2;
+
+#define ARCV(t, val) newarc(v->nfa, t, val, lp, rp)
+ int m,
+ n;
+ struct subre *atom; /* atom's subtree */
+ struct subre *t;
+ int cap; /* capturing parens? */
+ int pos; /* positive lookahead? */
+ int subno; /* capturing-parens or backref number */
+ int atomtype;
+ int qprefer; /* quantifier short/long preference */
+ int f;
+ struct subre **atomp; /* where the pointer to atom is */
+
+ /* initial bookkeeping */
+ atom = NULL;
+ assert(lp->nouts == 0); /* must string new code */
+ assert(rp->nins == 0); /* between lp and rp */
+ subno = 0; /* just to shut lint up */
+
+ /* an atom or constraint... */
+ atomtype = v->nexttype;
+ switch (atomtype)
+ {
+ /* first, constraints, which end by returning */
+ case '^':
+ ARCV('^', 1);
+ if (v->cflags & REG_NLANCH)
+ ARCV(BEHIND, v->nlcolor);
+ NEXT();
+ return;
+ break;
+ case '$':
+ ARCV('$', 1);
+ if (v->cflags & REG_NLANCH)
+ ARCV(AHEAD, v->nlcolor);
+ NEXT();
+ return;
+ break;
+ case SBEGIN:
+ ARCV('^', 1); /* BOL */
+ ARCV('^', 0); /* or BOS */
+ NEXT();
+ return;
+ break;
+ case SEND:
+ ARCV('$', 1); /* EOL */
+ ARCV('$', 0); /* or EOS */
+ NEXT();
+ return;
+ break;
+ case '<':
+ wordchrs(v); /* does NEXT() */
+ s = newstate(v->nfa);
+ NOERR();
+ nonword(v, BEHIND, lp, s);
+ word(v, AHEAD, s, rp);
+ return;
+ break;
+ case '>':
+ wordchrs(v); /* does NEXT() */
+ s = newstate(v->nfa);
+ NOERR();
+ word(v, BEHIND, lp, s);
+ nonword(v, AHEAD, s, rp);
+ return;
break;
- case '-':
- SETERROR(REG_ERANGE);
- return; /* NOTE RETURN */
+ case WBDRY:
+ wordchrs(v); /* does NEXT() */
+ s = newstate(v->nfa);
+ NOERR();
+ nonword(v, BEHIND, lp, s);
+ word(v, AHEAD, s, rp);
+ s = newstate(v->nfa);
+ NOERR();
+ word(v, BEHIND, lp, s);
+ nonword(v, AHEAD, s, rp);
+ return;
+ break;
+ case NWBDRY:
+ wordchrs(v); /* does NEXT() */
+ s = newstate(v->nfa);
+ NOERR();
+ word(v, BEHIND, lp, s);
+ word(v, AHEAD, s, rp);
+ s = newstate(v->nfa);
+ NOERR();
+ nonword(v, BEHIND, lp, s);
+ nonword(v, AHEAD, s, rp);
+ return;
break;
+ case LACON: /* lookahead constraint */
+ pos = v->nextvalue;
+ NEXT();
+ s = newstate(v->nfa);
+ s2 = newstate(v->nfa);
+ NOERR();
+ t = parse(v, ')', LACON, s, s2);
+ freesubre(v, t); /* internal structure irrelevant */
+ assert(SEE(')') || ISERR());
+ NEXT();
+ n = newlacon(v, s, s2, pos);
+ NOERR();
+ ARCV(LACON, n);
+ return;
+ break;
+ /* then errors, to get them out of the way */
+ case '*':
+ case '+':
+ case '?':
+ case '{':
+ ERR(REG_BADRPT);
+ return;
+ break;
default:
- c = '\0';
+ ERR(REG_ASSERT);
+ return;
break;
+ /* then plain characters, and minor variants on that theme */
+ case ')': /* unbalanced paren */
+ if ((v->cflags & REG_ADVANCED) != REG_EXTENDED)
+ {
+ ERR(REG_EPAREN);
+ return;
}
-
- switch (c) {
- case ':': /* character class */
- NEXT2();
- REQUIRE(MORE(), REG_EBRACK);
- c = PEEK();
- REQUIRE(c != '-' && c != ']', REG_ECTYPE);
- p_b_cclass(p, cs);
- REQUIRE(MORE(), REG_EBRACK);
- REQUIRE(EATTWO(':', ']'), REG_ECTYPE);
+ /* legal in EREs due to specification botch */
+ NOTE(REG_UPBOTCH);
+ /* fallthrough into case PLAIN */
+ case PLAIN:
+ onechr(v, v->nextvalue, lp, rp);
+ okcolors(v->nfa, v->cm);
+ NOERR();
+ NEXT();
break;
- case '=': /* equivalence class */
- NEXT2();
- REQUIRE(MORE(), REG_EBRACK);
- c = PEEK();
- REQUIRE(c != '-' && c != ']', REG_ECOLLATE);
- p_b_eclass(p, cs);
- REQUIRE(MORE(), REG_EBRACK);
- REQUIRE(EATTWO('=', ']'), REG_ECOLLATE);
+ case '[':
+ if (v->nextvalue == 1)
+ bracket(v, lp, rp);
+ else
+ cbracket(v, lp, rp);
+ assert(SEE(']') || ISERR());
+ NEXT();
break;
- default: /* symbol, ordinary character, or range */
-/* xxx revision needed for multichar stuff */
- start = p_b_symbol(p);
- if (SEE('-') && MORE2() && PEEK2() != ']') {
- /* range */
+ case '.':
+ rainbow(v->nfa, v->cm, PLAIN,
+ (v->cflags & REG_NLSTOP) ? v->nlcolor : COLORLESS,
+ lp, rp);
NEXT();
- if (EAT('-'))
- finish = '-';
+ break;
+ /* and finally the ugly stuff */
+ case '(': /* value flags as capturing or non */
+ cap = (type == LACON) ? 0 : v->nextvalue;
+ if (cap)
+ {
+ v->nsubexp++;
+ subno = v->nsubexp;
+ if ((size_t) subno >= v->nsubs)
+ moresubs(v, subno);
+ assert((size_t) subno < v->nsubs);
+ }
else
- finish = p_b_symbol(p);
- } else
- finish = start;
-/* xxx what about signed chars here... */
- REQUIRE(start <= finish, REG_ERANGE);
- for (i = start; i <= finish; i++)
- CHadd(cs, i);
+ atomtype = PLAIN; /* something that's not '(' */
+ NEXT();
+ /* need new endpoints because tree will contain pointers */
+ s = newstate(v->nfa);
+ s2 = newstate(v->nfa);
+ NOERR();
+ EMPTYARC(lp, s);
+ EMPTYARC(s2, rp);
+ NOERR();
+ atom = parse(v, ')', PLAIN, s, s2);
+ assert(SEE(')') || ISERR());
+ NEXT();
+ NOERR();
+ if (cap)
+ {
+ v->subs[subno] = atom;
+ t = subre(v, '(', atom->flags | CAP, lp, rp);
+ NOERR();
+ t->subno = subno;
+ t->left = atom;
+ atom = t;
+ }
+ /* postpone everything else pending possible {0} */
+ break;
+ case BACKREF: /* the Feature From The Black Lagoon */
+ INSIST(type != LACON, REG_ESUBREG);
+ INSIST(v->nextvalue < v->nsubs, REG_ESUBREG);
+ INSIST(v->subs[v->nextvalue] != NULL, REG_ESUBREG);
+ NOERR();
+ assert(v->nextvalue > 0);
+ atom = subre(v, 'b', BACKR, lp, rp);
+ subno = v->nextvalue;
+ atom->subno = subno;
+ EMPTYARC(lp, rp); /* temporarily, so there's something */
+ NEXT();
break;
}
-}
-/*
- - p_b_cclass - parse a character-class name and deal with it
- == static void p_b_cclass(register struct parse *p, register cset *cs);
- */
-static void
-p_b_cclass(p, cs)
-register struct parse *p;
-register cset *cs;
-{
- register char *sp = p->next;
- register struct cclass *cp;
- register size_t len;
- register char *u;
- register char c;
-
- while (MORE() && isalpha(PEEK()))
+ /* ...and an atom may be followed by a quantifier */
+ switch (v->nexttype)
+ {
+ case '*':
+ m = 0;
+ n = INFINITY;
+ qprefer = (v->nextvalue) ? LONGER : SHORTER;
+ NEXT();
+ break;
+ case '+':
+ m = 1;
+ n = INFINITY;
+ qprefer = (v->nextvalue) ? LONGER : SHORTER;
+ NEXT();
+ break;
+ case '?':
+ m = 0;
+ n = 1;
+ qprefer = (v->nextvalue) ? LONGER : SHORTER;
NEXT();
- len = p->next - sp;
- for (cp = cclasses; cp->name != NULL; cp++)
- if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0')
break;
- if (cp->name == NULL) {
- /* oops, didn't find it */
- SETERROR(REG_ECTYPE);
+ case '{':
+ NEXT();
+ m = scannum(v);
+ if (EAT(','))
+ {
+ if (SEE(DIGIT))
+ n = scannum(v);
+ else
+ n = INFINITY;
+ if (m > n)
+ {
+ ERR(REG_BADBR);
return;
}
+ /* {m,n} exercises preference, even if it's {m,m} */
+ qprefer = (v->nextvalue) ? LONGER : SHORTER;
+ }
+ else
+ {
+ n = m;
+ /* {m} passes operand's preference through */
+ qprefer = 0;
+ }
+ if (!SEE('}'))
+ { /* catches errors too */
+ ERR(REG_BADBR);
+ return;
+ }
+ NEXT();
+ break;
+ default: /* no quantifier */
+ m = n = 1;
+ qprefer = 0;
+ break;
+ }
- u = cp->chars;
- while ((c = *u++) != '\0')
- CHadd(cs, c);
- for (u = cp->multis; *u != '\0'; u += strlen(u) + 1)
- MCadd(p, cs, u);
-}
+ /* annoying special case: {0} or {0,0} cancels everything */
+ if (m == 0 && n == 0)
+ {
+ if (atom != NULL)
+ freesubre(v, atom);
+ if (atomtype == '(')
+ v->subs[subno] = NULL;
+ delsub(v->nfa, lp, rp);
+ EMPTYARC(lp, rp);
+ return;
+ }
-/*
- - p_b_eclass - parse an equivalence-class name and deal with it
- == static void p_b_eclass(register struct parse *p, register cset *cs);
- *
- * This implementation is incomplete. xxx
+ /* if not a messy case, avoid hard part */
+ assert(!MESSY(top->flags));
+ f = top->flags | qprefer | ((atom != NULL) ? atom->flags : 0);
+ if (atomtype != '(' && atomtype != BACKREF && !MESSY(UP(f)))
+ {
+ if (!(m == 1 && n == 1))
+ repeat(v, lp, rp, m, n);
+ if (atom != NULL)
+ freesubre(v, atom);
+ top->flags = f;
+ return;
+ }
+
+ /*
+ * hard part: something messy That is, capturing parens, back
+ * reference, short/long clash, or an atom with substructure
+ * containing one of those.
*/
-static void
-p_b_eclass(p, cs)
-register struct parse *p;
-register cset *cs;
-{
- register char c;
- c = p_b_coll_elem(p, '=');
- CHadd(cs, c);
-}
+ /* now we'll need a subre for the contents even if they're boring */
+ if (atom == NULL)
+ {
+ atom = subre(v, '=', 0, lp, rp);
+ NOERR();
+ }
-/*
- - p_b_symbol - parse a character or [..]ed multicharacter collating symbol
- == static char p_b_symbol(register struct parse *p);
+ /*
+ * prepare a general-purpose state skeleton
+ *
+ * ---> [s] ---prefix---> [begin] ---atom---> [end] ----rest---> [rp] / /
+ * [lp] ----> [s2] ----bypass---------------------
+ *
+ * where bypass is an empty, and prefix is some repetitions of atom
*/
-static char /* value of symbol */
-p_b_symbol(p)
-register struct parse *p;
-{
- register char value;
+ s = newstate(v->nfa); /* first, new endpoints for the atom */
+ s2 = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ moveins(v->nfa, rp, s2);
+ NOERR();
+ atom->begin = s;
+ atom->end = s2;
+ s = newstate(v->nfa); /* and spots for prefix and bypass */
+ s2 = newstate(v->nfa);
+ NOERR();
+ EMPTYARC(lp, s);
+ EMPTYARC(lp, s2);
+ NOERR();
+
+ /* break remaining subRE into x{...} and what follows */
+ t = subre(v, '.', COMBINE(qprefer, atom->flags), lp, rp);
+ t->left = atom;
+ atomp = &t->left;
+ /* here we should recurse... but we must postpone that to the end */
+
+ /* split top into prefix and remaining */
+ assert(top->op == '=' && top->left == NULL && top->right == NULL);
+ top->left = subre(v, '=', top->flags, top->begin, lp);
+ top->op = '.';
+ top->right = t;
+
+ /* if it's a backref, now is the time to replicate the subNFA */
+ if (atomtype == BACKREF)
+ {
+ assert(atom->begin->nouts == 1); /* just the EMPTY */
+ delsub(v->nfa, atom->begin, atom->end);
+ assert(v->subs[subno] != NULL);
+ /* and here's why the recursion got postponed: it must */
+ /* wait until the skeleton is filled in, because it may */
+ /* hit a backref that wants to copy the filled-in skeleton */
+ dupnfa(v->nfa, v->subs[subno]->begin, v->subs[subno]->end,
+ atom->begin, atom->end);
+ NOERR();
+ }
+
+ /* it's quantifier time; first, turn x{0,...} into x{1,...}|empty */
+ if (m == 0)
+ {
+ EMPTYARC(s2, atom->end); /* the bypass */
+ assert(PREF(qprefer) != 0);
+ f = COMBINE(qprefer, atom->flags);
+ t = subre(v, '|', f, lp, atom->end);
+ NOERR();
+ t->left = atom;
+ t->right = subre(v, '|', PREF(f), s2, atom->end);
+ NOERR();
+ t->right->left = subre(v, '=', 0, s2, atom->end);
+ NOERR();
+ *atomp = t;
+ atomp = &t->left;
+ m = 1;
+ }
- REQUIRE(MORE(), REG_EBRACK);
- if (!EATTWO('[', '.'))
- return(GETNEXT());
+ /* deal with the rest of the quantifier */
+ if (atomtype == BACKREF)
+ {
+ /* special case: backrefs have internal quantifiers */
+ EMPTYARC(s, atom->begin); /* empty prefix */
+ /* just stuff everything into atom */
+ repeat(v, atom->begin, atom->end, m, n);
+ atom->min = (short) m;
+ atom->max = (short) n;
+ atom->flags |= COMBINE(qprefer, atom->flags);
+ }
+ else if (m == 1 && n == 1)
+ {
+ /* no/vacuous quantifier: done */
+ EMPTYARC(s, atom->begin); /* empty prefix */
+ }
+ else
+ {
+ /* turn x{m,n} into x{m-1,n-1}x, with capturing */
+ /* parens in only second x */
+ dupnfa(v->nfa, atom->begin, atom->end, s, atom->begin);
+ assert(m >= 1 && m != INFINITY && n >= 1);
+ repeat(v, s, atom->begin, m - 1, (n == INFINITY) ? n : n - 1);
+ f = COMBINE(qprefer, atom->flags);
+ t = subre(v, '.', f, s, atom->end); /* prefix and atom */
+ NOERR();
+ t->left = subre(v, '=', PREF(f), s, atom->begin);
+ NOERR();
+ t->right = atom;
+ *atomp = t;
+ }
- /* collating symbol */
- value = p_b_coll_elem(p, '.');
- REQUIRE(EATTWO('.', ']'), REG_ECOLLATE);
- return(value);
+ /* and finally, look after that postponed recursion */
+ t = top->right;
+ if (!(SEE('|') || SEE(stopper) || SEE(EOS)))
+ t->right = parsebranch(v, stopper, type, atom->end, rp, 1);
+ else
+ {
+ EMPTYARC(atom->end, rp);
+ t->right = subre(v, '=', 0, atom->end, rp);
+ }
+ assert(SEE('|') || SEE(stopper) || SEE(EOS));
+ t->flags |= COMBINE(t->flags, t->right->flags);
+ top->flags |= COMBINE(top->flags, t->flags);
}
/*
- - p_b_coll_elem - parse a collating-element name and look it up
- == static char p_b_coll_elem(register struct parse *p, int endc);
+ * nonword - generate arcs for non-word-character ahead or behind
*/
-static char /* value of collating element */
-p_b_coll_elem(p, endc)
-register struct parse *p;
-int endc; /* name ended by endc,']' */
+static void
+nonword(struct vars * v,
+ int dir, /* AHEAD or BEHIND */
+ struct state * lp,
+ struct state * rp)
{
- register char *sp = p->next;
- register struct cname *cp;
- register int len;
+ int anchor = (dir == AHEAD) ? '$' : '^';
- while (MORE() && !SEETWO(endc, ']'))
- NEXT();
- if (!MORE()) {
- SETERROR(REG_EBRACK);
- return(0);
- }
- len = p->next - sp;
- for (cp = cnames; cp->name != NULL; cp++)
- if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0')
- return(cp->code); /* known name */
- if (len == 1)
- return(*sp); /* single character */
- SETERROR(REG_ECOLLATE); /* neither */
- return(0);
+ assert(dir == AHEAD || dir == BEHIND);
+ newarc(v->nfa, anchor, 1, lp, rp);
+ newarc(v->nfa, anchor, 0, lp, rp);
+ colorcomplement(v->nfa, v->cm, dir, v->wordchrs, lp, rp);
+ /* (no need for special attention to \n) */
}
/*
- - othercase - return the case counterpart of an alphabetic
- == static char othercase(int ch);
+ * word - generate arcs for word character ahead or behind
*/
-static char /* if no counterpart, return ch */
-othercase(ch)
-int ch;
+static void
+word(struct vars * v,
+ int dir, /* AHEAD or BEHIND */
+ struct state * lp,
+ struct state * rp)
{
- assert(isalpha(ch));
- if (isupper(ch))
- return(tolower(ch));
- else if (islower(ch))
- return(toupper(ch));
- else /* peculiar, but could happen */
- return(ch);
+ assert(dir == AHEAD || dir == BEHIND);
+ cloneouts(v->nfa, v->wordchrs, lp, rp, dir);
+ /* (no need for special attention to \n) */
}
/*
- - bothcases - emit a dualcase version of a two-case character
- == static void bothcases(register struct parse *p, int ch);
- *
- * Boy, is this implementation ever a kludge...
+ * scannum - scan a number
*/
-static void
-bothcases(p, ch)
-register struct parse *p;
-int ch;
+static int /* value, <= DUPMAX */
+scannum(struct vars * v)
{
- register char *oldnext = p->next;
- register char *oldend = p->end;
- char bracket[3];
-
- assert(othercase(ch) != ch); /* p_bracket() would recurse */
- p->next = bracket;
- p->end = bracket+2;
- bracket[0] = ch;
- bracket[1] = ']';
- bracket[2] = '\0';
- p_bracket(p);
- assert(p->next == bracket+2);
- p->next = oldnext;
- p->end = oldend;
+ int n = 0;
+
+ while (SEE(DIGIT) && n < DUPMAX)
+ {
+ n = n * 10 + v->nextvalue;
+ NEXT();
+ }
+ if (SEE(DIGIT) || n > DUPMAX)
+ {
+ ERR(REG_BADBR);
+ return 0;
+ }
+ return n;
}
/*
- - ordinary - emit an ordinary character
- == static void ordinary(register struct parse *p, register int ch);
+ * repeat - replicate subNFA for quantifiers
+ *
+ * The duplication sequences used here are chosen carefully so that any
+ * pointers starting out pointing into the subexpression end up pointing into
+ * the last occurrence. (Note that it may not be strung between the same
+ * left and right end states, however!) This used to be important for the
+ * subRE tree, although the important bits are now handled by the in-line
+ * code in parse(), and when this is called, it doesn't matter any more.
*/
static void
-ordinary(p, ch)
-register struct parse *p;
-register int ch;
+repeat(struct vars * v,
+ struct state * lp,
+ struct state * rp,
+ int m,
+ int n)
{
- register cat_t *cap = p->g->categories;
-
- if ((p->g->cflags®_ICASE) && isalpha(ch) && othercase(ch) != ch)
- bothcases(p, ch);
- else {
- EMIT(OCHAR, (unsigned char)ch);
- if (cap[ch] == 0)
- cap[ch] = p->g->ncategories++;
+#define SOME 2
+#define INF 3
+#define PAIR(x, y) ((x)*4 + (y))
+#define REDUCE(x) ( ((x) == INFINITY) ? INF : (((x) > 1) ? SOME : (x)) )
+ const int rm = REDUCE(m);
+ const int rn = REDUCE(n);
+ struct state *s;
+ struct state *s2;
+
+ switch (PAIR(rm, rn))
+ {
+ case PAIR(0, 0): /* empty string */
+ delsub(v->nfa, lp, rp);
+ EMPTYARC(lp, rp);
+ break;
+ case PAIR(0, 1): /* do as x| */
+ EMPTYARC(lp, rp);
+ break;
+ case PAIR(0, SOME): /* do as x{1,n}| */
+ repeat(v, lp, rp, 1, n);
+ NOERR();
+ EMPTYARC(lp, rp);
+ break;
+ case PAIR(0, INF): /* loop x around */
+ s = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ moveins(v->nfa, rp, s);
+ EMPTYARC(lp, s);
+ EMPTYARC(s, rp);
+ break;
+ case PAIR(1, 1): /* no action required */
+ break;
+ case PAIR(1, SOME): /* do as x{0,n-1}x = (x{1,n-1}|)x */
+ s = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ dupnfa(v->nfa, s, rp, lp, s);
+ NOERR();
+ repeat(v, lp, s, 1, n - 1);
+ NOERR();
+ EMPTYARC(lp, s);
+ break;
+ case PAIR(1, INF): /* add loopback arc */
+ s = newstate(v->nfa);
+ s2 = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ moveins(v->nfa, rp, s2);
+ EMPTYARC(lp, s);
+ EMPTYARC(s2, rp);
+ EMPTYARC(s2, s);
+ break;
+ case PAIR(SOME, SOME): /* do as x{m-1,n-1}x */
+ s = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ dupnfa(v->nfa, s, rp, lp, s);
+ NOERR();
+ repeat(v, lp, s, m - 1, n - 1);
+ break;
+ case PAIR(SOME, INF): /* do as x{m-1,}x */
+ s = newstate(v->nfa);
+ NOERR();
+ moveouts(v->nfa, lp, s);
+ dupnfa(v->nfa, s, rp, lp, s);
+ NOERR();
+ repeat(v, lp, s, m - 1, n);
+ break;
+ default:
+ ERR(REG_ASSERT);
+ break;
}
}
/*
- - nonnewline - emit REG_NEWLINE version of OANY
- == static void nonnewline(register struct parse *p);
- *
- * Boy, is this implementation ever a kludge...
+ * bracket - handle non-complemented bracket expression
+ * Also called from cbracket for complemented bracket expressions.
*/
static void
-nonnewline(p)
-register struct parse *p;
+bracket(struct vars * v,
+ struct state * lp,
+ struct state * rp)
{
- register char *oldnext = p->next;
- register char *oldend = p->end;
- char bracket[4];
-
- p->next = bracket;
- p->end = bracket+3;
- bracket[0] = '^';
- bracket[1] = '\n';
- bracket[2] = ']';
- bracket[3] = '\0';
- p_bracket(p);
- assert(p->next == bracket+3);
- p->next = oldnext;
- p->end = oldend;
+ assert(SEE('['));
+ NEXT();
+ while (!SEE(']') && !SEE(EOS))
+ brackpart(v, lp, rp);
+ assert(SEE(']') || ISERR());
+ okcolors(v->nfa, v->cm);
}
/*
- - repeat - generate code for a bounded repetition, recursively if needed
- == static void repeat(register struct parse *p, sopno start, int from, int to);
+ * cbracket - handle complemented bracket expression
+ * We do it by calling bracket() with dummy endpoints, and then complementing
+ * the result. The alternative would be to invoke rainbow(), and then delete
+ * arcs as the b.e. is seen... but that gets messy.
*/
static void
-repeat(p, start, from, to)
-register struct parse *p;
-sopno start; /* operand from here to end of strip */
-int from; /* repeated from this number */
-int to; /* to this number of times (maybe INFINITY) */
+cbracket(struct vars * v,
+ struct state * lp,
+ struct state * rp)
{
- register sopno finish = HERE();
-# define N 2
-# define INF 3
-# define REP(f, t) ((f)*8 + (t))
-# define MAP(n) (((n) <= 1) ? (n) : ((n) == INFINITY) ? INF : N)
- register sopno copy;
-
- if (p->error != 0) /* head off possible runaway recursion */
+ struct state *left = newstate(v->nfa);
+ struct state *right = newstate(v->nfa);
+ struct state *s;
+ struct arc *a; /* arc from lp */
+ struct arc *ba; /* arc from left, from bracket() */
+ struct arc *pa; /* MCCE-prototype arc */
+ color co;
+ chr *p;
+ int i;
+
+ NOERR();
+ bracket(v, left, right);
+ if (v->cflags & REG_NLSTOP)
+ newarc(v->nfa, PLAIN, v->nlcolor, left, right);
+ NOERR();
+
+ assert(lp->nouts == 0); /* all outarcs will be ours */
+
+ /* easy part of complementing */
+ colorcomplement(v->nfa, v->cm, PLAIN, left, lp, rp);
+ NOERR();
+ if (v->mcces == NULL)
+ { /* no MCCEs -- we're done */
+ dropstate(v->nfa, left);
+ assert(right->nins == 0);
+ freestate(v->nfa, right);
return;
+ }
+
+ /* but complementing gets messy in the presence of MCCEs... */
+ NOTE(REG_ULOCALE);
+ for (p = v->mcces->chrs, i = v->mcces->nchrs; i > 0; p++, i--)
+ {
+ co = GETCOLOR(v->cm, *p);
+ a = findarc(lp, PLAIN, co);
+ ba = findarc(left, PLAIN, co);
+ if (ba == NULL)
+ {
+ assert(a != NULL);
+ freearc(v->nfa, a);
+ }
+ else
+ assert(a == NULL);
+ s = newstate(v->nfa);
+ NOERR();
+ newarc(v->nfa, PLAIN, co, lp, s);
+ NOERR();
+ pa = findarc(v->mccepbegin, PLAIN, co);
+ assert(pa != NULL);
+ if (ba == NULL)
+ { /* easy case, need all of them */
+ cloneouts(v->nfa, pa->to, s, rp, PLAIN);
+ newarc(v->nfa, '$', 1, s, rp);
+ newarc(v->nfa, '$', 0, s, rp);
+ colorcomplement(v->nfa, v->cm, AHEAD, pa->to, s, rp);
+ }
+ else
+ { /* must be selective */
+ if (findarc(ba->to, '$', 1) == NULL)
+ {
+ newarc(v->nfa, '$', 1, s, rp);
+ newarc(v->nfa, '$', 0, s, rp);
+ colorcomplement(v->nfa, v->cm, AHEAD, pa->to,
+ s, rp);
+ }
+ for (pa = pa->to->outs; pa != NULL; pa = pa->outchain)
+ if (findarc(ba->to, PLAIN, pa->co) == NULL)
+ newarc(v->nfa, PLAIN, pa->co, s, rp);
+ if (s->nouts == 0) /* limit of selectivity: none */
+ dropstate(v->nfa, s); /* frees arc too */
+ }
+ NOERR();
+ }
- assert(from <= to);
+ delsub(v->nfa, left, right);
+ assert(left->nouts == 0);
+ freestate(v->nfa, left);
+ assert(right->nins == 0);
+ freestate(v->nfa, right);
+}
- switch (REP(MAP(from), MAP(to))) {
- case REP(0, 0): /* must be user doing this */
- DROP(finish-start); /* drop the operand */
+/*
+ * brackpart - handle one item (or range) within a bracket expression
+ */
+static void
+brackpart(struct vars * v,
+ struct state * lp,
+ struct state * rp)
+{
+ celt startc;
+ celt endc;
+ struct cvec *cv;
+ chr *startp;
+ chr *endp;
+ chr c[1];
+
+ /* parse something, get rid of special cases, take shortcuts */
+ switch (v->nexttype)
+ {
+ case RANGE: /* a-b-c or other botch */
+ ERR(REG_ERANGE);
+ return;
break;
- case REP(0, 1): /* as x{1,1}? */
- case REP(0, N): /* as x{1,n}? */
- case REP(0, INF): /* as x{1,}? */
- /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
- INSERT(OCH_, start); /* offset is wrong... */
- repeat(p, start+1, 1, to);
- ASTERN(OOR1, start);
- AHEAD(start); /* ... fix it */
- EMIT(OOR2, 0);
- AHEAD(THERE());
- ASTERN(O_CH, THERETHERE());
+ case PLAIN:
+ c[0] = v->nextvalue;
+ NEXT();
+ /* shortcut for ordinary chr (not range, not MCCE leader) */
+ if (!SEE(RANGE) && !ISCELEADER(v, c[0]))
+ {
+ onechr(v, c[0], lp, rp);
+ return;
+ }
+ startc = element(v, c, c + 1);
+ NOERR();
break;
- case REP(1, 1): /* trivial case */
- /* done */
+ case COLLEL:
+ startp = v->now;
+ endp = scanplain(v);
+ INSIST(startp < endp, REG_ECOLLATE);
+ NOERR();
+ startc = element(v, startp, endp);
+ NOERR();
+ break;
+ case ECLASS:
+ startp = v->now;
+ endp = scanplain(v);
+ INSIST(startp < endp, REG_ECOLLATE);
+ NOERR();
+ startc = element(v, startp, endp);
+ NOERR();
+ cv = eclass(v, startc, (v->cflags & REG_ICASE));
+ NOERR();
+ dovec(v, cv, lp, rp);
+ return;
break;
- case REP(1, N): /* as x?x{1,n-1} */
- /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
- INSERT(OCH_, start);
- ASTERN(OOR1, start);
- AHEAD(start);
- EMIT(OOR2, 0); /* offset very wrong... */
- AHEAD(THERE()); /* ...so fix it */
- ASTERN(O_CH, THERETHERE());
- copy = dupl(p, start+1, finish+1);
- assert(copy == finish+4);
- repeat(p, copy, 1, to-1);
+ case CCLASS:
+ startp = v->now;
+ endp = scanplain(v);
+ INSIST(startp < endp, REG_ECTYPE);
+ NOERR();
+ cv = cclass(v, startp, endp, (v->cflags & REG_ICASE));
+ NOERR();
+ dovec(v, cv, lp, rp);
+ return;
break;
- case REP(1, INF): /* as x+ */
- INSERT(OPLUS_, start);
- ASTERN(O_PLUS, start);
+ default:
+ ERR(REG_ASSERT);
+ return;
break;
- case REP(N, N): /* as xx{m-1,n-1} */
- copy = dupl(p, start, finish);
- repeat(p, copy, from-1, to-1);
+ }
+
+ if (SEE(RANGE))
+ {
+ NEXT();
+ switch (v->nexttype)
+ {
+ case PLAIN:
+ case RANGE:
+ c[0] = v->nextvalue;
+ NEXT();
+ endc = element(v, c, c + 1);
+ NOERR();
break;
- case REP(N, INF): /* as xx{n-1,INF} */
- copy = dupl(p, start, finish);
- repeat(p, copy, from-1, to);
+ case COLLEL:
+ startp = v->now;
+ endp = scanplain(v);
+ INSIST(startp < endp, REG_ECOLLATE);
+ NOERR();
+ endc = element(v, startp, endp);
+ NOERR();
break;
- default: /* "can't happen" */
- SETERROR(REG_ASSERT); /* just in case */
+ default:
+ ERR(REG_ERANGE);
+ return;
break;
}
+ }
+ else
+ endc = startc;
+
+ /*
+ * Ranges are unportable. Actually, standard C does guarantee that
+ * digits are contiguous, but making that an exception is just too
+ * complicated.
+ */
+ if (startc != endc)
+ NOTE(REG_UUNPORT);
+ cv = range(v, startc, endc, (v->cflags & REG_ICASE));
+ NOERR();
+ dovec(v, cv, lp, rp);
}
/*
- - seterr - set an error condition
- == static int seterr(register struct parse *p, int e);
+ * scanplain - scan PLAIN contents of [. etc.
+ *
+ * Certain bits of trickery in lex.c know that this code does not try
+ * to look past the final bracket of the [. etc.
*/
-static int /* useless but makes type checking happy */
-seterr(p, e)
-register struct parse *p;
-int e;
+static chr * /* just after end of sequence */
+scanplain(struct vars * v)
{
- if (p->error == 0) /* keep earliest error condition */
- p->error = e;
- p->next = nuls; /* try to bring things to a halt */
- p->end = nuls;
- return(0); /* make the return value well-defined */
+ chr *endp;
+
+ assert(SEE(COLLEL) || SEE(ECLASS) || SEE(CCLASS));
+ NEXT();
+
+ endp = v->now;
+ while (SEE(PLAIN))
+ {
+ endp = v->now;
+ NEXT();
+ }
+
+ assert(SEE(END) || ISERR());
+ NEXT();
+
+ return endp;
}
/*
- - allocset - allocate a set of characters for []
- == static cset *allocset(register struct parse *p);
+ * leaders - process a cvec of collating elements to also include leaders
+ * Also gives all characters involved their own colors, which is almost
+ * certainly necessary, and sets up little disconnected subNFA.
*/
-static cset *
-allocset(p)
-register struct parse *p;
+static void
+leaders(struct vars * v,
+ struct cvec * cv)
{
- register int no = p->g->ncsets++;
- register size_t nc;
- register size_t nbytes;
- register cset *cs;
- register size_t css = (size_t)p->g->csetsize;
- register int i;
-
- if (no >= p->ncsalloc) { /* need another column of space */
- p->ncsalloc += CHAR_BIT;
- nc = p->ncsalloc;
- assert(nc % CHAR_BIT == 0);
- nbytes = nc / CHAR_BIT * css;
- if (p->g->sets == NULL)
- p->g->sets = (cset *)malloc(nc * sizeof(cset));
- else
- p->g->sets = (cset *)realloc((char *)p->g->sets,
- nc * sizeof(cset));
- if (p->g->setbits == NULL)
- p->g->setbits = (uch *)malloc(nbytes);
- else {
- p->g->setbits = (uch *)realloc((char *)p->g->setbits,
- nbytes);
- /* xxx this isn't right if setbits is now NULL */
- for (i = 0; i < no; i++)
- p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT);
+ int mcce;
+ chr *p;
+ chr leader;
+ struct state *s;
+ struct arc *a;
+
+ v->mccepbegin = newstate(v->nfa);
+ v->mccepend = newstate(v->nfa);
+ NOERR();
+
+ for (mcce = 0; mcce < cv->nmcces; mcce++)
+ {
+ p = cv->mcces[mcce];
+ leader = *p;
+ if (!haschr(cv, leader))
+ {
+ addchr(cv, leader);
+ s = newstate(v->nfa);
+ newarc(v->nfa, PLAIN, subcolor(v->cm, leader),
+ v->mccepbegin, s);
+ okcolors(v->nfa, v->cm);
}
- if (p->g->sets != NULL && p->g->setbits != NULL)
- (void) memset((char *)p->g->setbits + (nbytes - css),
- 0, css);
- else {
- no = 0;
- SETERROR(REG_ESPACE);
- /* caller's responsibility not to do set ops */
+ else
+ {
+ a = findarc(v->mccepbegin, PLAIN,
+ GETCOLOR(v->cm, leader));
+ assert(a != NULL);
+ s = a->to;
+ assert(s != v->mccepend);
}
+ p++;
+ assert(*p != 0 && *(p + 1) == 0); /* only 2-char MCCEs for
+ * now */
+ newarc(v->nfa, PLAIN, subcolor(v->cm, *p), s, v->mccepend);
+ okcolors(v->nfa, v->cm);
}
-
- assert(p->g->sets != NULL); /* xxx */
- cs = &p->g->sets[no];
- cs->ptr = p->g->setbits + css*((no)/CHAR_BIT);
- cs->mask = 1 << ((no) % CHAR_BIT);
- cs->hash = 0;
- cs->smultis = 0;
- cs->multis = NULL;
-
- return(cs);
}
/*
- - freeset - free a now-unused set
- == static void freeset(register struct parse *p, register cset *cs);
+ * onechr - fill in arcs for a plain character, and possible case complements
+ * This is mostly a shortcut for efficient handling of the common case.
*/
static void
-freeset(p, cs)
-register struct parse *p;
-register cset *cs;
+onechr(struct vars * v,
+ chr c,
+ struct state * lp,
+ struct state * rp)
{
- register size_t i;
- register cset *top = &p->g->sets[p->g->ncsets];
- register size_t css = (size_t)p->g->csetsize;
-
- for (i = 0; i < css; i++)
- CHsub(cs, i);
- if (cs == top-1) /* recover only the easy case */
- p->g->ncsets--;
+ if (!(v->cflags & REG_ICASE))
+ {
+ newarc(v->nfa, PLAIN, subcolor(v->cm, c), lp, rp);
+ return;
+ }
+
+ /* rats, need general case anyway... */
+ dovec(v, allcases(v, c), lp, rp);
}
/*
- - freezeset - final processing on a set of characters
- == static int freezeset(register struct parse *p, register cset *cs);
- *
- * The main task here is merging identical sets. This is usually a waste
- * of time (although the hash code minimizes the overhead), but can win
- * big if REG_ICASE is being used. REG_ICASE, by the way, is why the hash
- * is done using addition rather than xor -- all ASCII [aA] sets xor to
- * the same value!
+ * dovec - fill in arcs for each element of a cvec
+ * This one has to handle the messy cases, like MCCEs and MCCE leaders.
*/
-static int /* set number */
-freezeset(p, cs)
-register struct parse *p;
-register cset *cs;
+static void
+dovec(struct vars * v,
+ struct cvec * cv,
+ struct state * lp,
+ struct state * rp)
{
- register uch h = cs->hash;
- register size_t i;
- register cset *top = &p->g->sets[p->g->ncsets];
- register cset *cs2;
- register size_t css = (size_t)p->g->csetsize;
-
- /* look for an earlier one which is the same */
- for (cs2 = &p->g->sets[0]; cs2 < top; cs2++)
- if (cs2->hash == h && cs2 != cs) {
- /* maybe */
- for (i = 0; i < css; i++)
- if (!!CHIN(cs2, i) != !!CHIN(cs, i))
- break; /* no */
- if (i == css)
- break; /* yes */
+ chr ch,
+ from,
+ to;
+ celt ce;
+ chr *p;
+ int i;
+ color co;
+ struct cvec *leads;
+ struct arc *a;
+ struct arc *pa; /* arc in prototype */
+ struct state *s;
+ struct state *ps; /* state in prototype */
+
+ /* need a place to store leaders, if any */
+ if (nmcces(v) > 0)
+ {
+ assert(v->mcces != NULL);
+ if (v->cv2 == NULL || v->cv2->nchrs < v->mcces->nchrs)
+ {
+ if (v->cv2 != NULL)
+ free(v->cv2);
+ v->cv2 = newcvec(v->mcces->nchrs, 0, v->mcces->nmcces);
+ NOERR();
+ leads = v->cv2;
}
+ else
+ leads = clearcvec(v->cv2);
+ }
+ else
+ leads = NULL;
+
+ /* first, get the ordinary characters out of the way */
+ for (p = cv->chrs, i = cv->nchrs; i > 0; p++, i--)
+ {
+ ch = *p;
+ if (!ISCELEADER(v, ch))
+ newarc(v->nfa, PLAIN, subcolor(v->cm, ch), lp, rp);
+ else
+ {
+ assert(singleton(v->cm, ch));
+ assert(leads != NULL);
+ if (!haschr(leads, ch))
+ addchr(leads, ch);
+ }
+ }
- if (cs2 < top) { /* found one */
- freeset(p, cs);
- cs = cs2;
+ /* and the ranges */
+ for (p = cv->ranges, i = cv->nranges; i > 0; p += 2, i--)
+ {
+ from = *p;
+ to = *(p + 1);
+ while (from <= to && (ce = nextleader(v, from, to)) != NOCELT)
+ {
+ if (from < ce)
+ subrange(v, from, ce - 1, lp, rp);
+ assert(singleton(v->cm, ce));
+ assert(leads != NULL);
+ if (!haschr(leads, ce))
+ addchr(leads, ce);
+ from = ce + 1;
+ }
+ if (from <= to)
+ subrange(v, from, to, lp, rp);
}
- return((int)(cs - p->g->sets));
-}
+ if ((leads == NULL || leads->nchrs == 0) && cv->nmcces == 0)
+ return;
-/*
- - firstch - return first character in a set (which must have at least one)
- == static int firstch(register struct parse *p, register cset *cs);
- */
-static int /* character; there is no "none" value */
-firstch(p, cs)
-register struct parse *p;
-register cset *cs;
-{
- register size_t i;
- register size_t css = (size_t)p->g->csetsize;
-
- for (i = 0; i < css; i++)
- if (CHIN(cs, i))
- return((char)i);
- assert(never);
- return(0); /* arbitrary */
+ /* deal with the MCCE leaders */
+ NOTE(REG_ULOCALE);
+ for (p = leads->chrs, i = leads->nchrs; i > 0; p++, i--)
+ {
+ co = GETCOLOR(v->cm, *p);
+ a = findarc(lp, PLAIN, co);
+ if (a != NULL)
+ s = a->to;
+ else
+ {
+ s = newstate(v->nfa);
+ NOERR();
+ newarc(v->nfa, PLAIN, co, lp, s);
+ NOERR();
+ }
+ pa = findarc(v->mccepbegin, PLAIN, co);
+ assert(pa != NULL);
+ ps = pa->to;
+ newarc(v->nfa, '$', 1, s, rp);
+ newarc(v->nfa, '$', 0, s, rp);
+ colorcomplement(v->nfa, v->cm, AHEAD, ps, s, rp);
+ NOERR();
+ }
+
+ /* and the MCCEs */
+ for (i = 0; i < cv->nmcces; i++)
+ {
+ p = cv->mcces[i];
+ assert(singleton(v->cm, *p));
+ if (!singleton(v->cm, *p))
+ {
+ ERR(REG_ASSERT);
+ return;
+ }
+ ch = *p++;
+ co = GETCOLOR(v->cm, ch);
+ a = findarc(lp, PLAIN, co);
+ if (a != NULL)
+ s = a->to;
+ else
+ {
+ s = newstate(v->nfa);
+ NOERR();
+ newarc(v->nfa, PLAIN, co, lp, s);
+ NOERR();
+ }
+ assert(*p != 0); /* at least two chars */
+ assert(singleton(v->cm, *p));
+ ch = *p++;
+ co = GETCOLOR(v->cm, ch);
+ assert(*p == 0); /* and only two, for now */
+ newarc(v->nfa, PLAIN, co, s, rp);
+ NOERR();
+ }
}
/*
- - nch - number of characters in a set
- == static int nch(register struct parse *p, register cset *cs);
+ * nextleader - find next MCCE leader within range
*/
-static int
-nch(p, cs)
-register struct parse *p;
-register cset *cs;
+static celt /* NOCELT means none */
+nextleader(struct vars * v,
+ chr from,
+ chr to)
{
- register size_t i;
- register size_t css = (size_t)p->g->csetsize;
- register int n = 0;
-
- for (i = 0; i < css; i++)
- if (CHIN(cs, i))
- n++;
- return(n);
+ int i;
+ chr *p;
+ chr ch;
+ celt it = NOCELT;
+
+ if (v->mcces == NULL)
+ return it;
+
+ for (i = v->mcces->nchrs, p = v->mcces->chrs; i > 0; i--, p++)
+ {
+ ch = *p;
+ if (from <= ch && ch <= to)
+ if (it == NOCELT || ch < it)
+ it = ch;
+ }
+ return it;
}
/*
- - mcadd - add a collating element to a cset
- == static void mcadd(register struct parse *p, register cset *cs, \
- == register char *cp);
+ * wordchrs - set up word-chr list for word-boundary stuff, if needed
+ *
+ * The list is kept as a bunch of arcs between two dummy states; it's
+ * disposed of by the unreachable-states sweep in NFA optimization.
+ * Does NEXT(). Must not be called from any unusual lexical context.
+ * This should be reconciled with the \w etc. handling in lex.c, and
+ * should be cleaned up to reduce dependencies on input scanning.
*/
static void
-mcadd(p, cs, cp)
-register struct parse *p;
-register cset *cs;
-register char *cp;
+wordchrs(struct vars * v)
{
- register size_t oldend = cs->smultis;
+ struct state *left;
+ struct state *right;
- cs->smultis += strlen(cp) + 1;
- if (cs->multis == NULL)
- cs->multis = malloc(cs->smultis);
- else
- cs->multis = realloc(cs->multis, cs->smultis);
- if (cs->multis == NULL) {
- SETERROR(REG_ESPACE);
+ if (v->wordchrs != NULL)
+ {
+ NEXT(); /* for consistency */
return;
}
- (void) strcpy(cs->multis + oldend - 1, cp);
- cs->multis[cs->smultis - 1] = '\0';
+ left = newstate(v->nfa);
+ right = newstate(v->nfa);
+ NOERR();
+ /* fine point: implemented with [::], and lexer will set REG_ULOCALE */
+ lexword(v);
+ NEXT();
+ assert(v->savenow != NULL && SEE('['));
+ bracket(v, left, right);
+ assert((v->savenow != NULL && SEE(']')) || ISERR());
+ NEXT();
+ NOERR();
+ v->wordchrs = left;
}
-/* these functions don't seem to be used (yet?), suppress warnings */
-#if 0
/*
- - mcsub - subtract a collating element from a cset
- == static void mcsub(register cset *cs, register char *cp);
+ * subre - allocate a subre
*/
-static void
-mcsub(cs, cp)
-register cset *cs;
-register char *cp;
+static struct subre *
+subre(struct vars * v,
+ int op,
+ int flags,
+ struct state * begin,
+ struct state * end)
{
- register char *fp = mcfind(cs, cp);
- register size_t len = strlen(fp);
+ struct subre *ret;
- assert(fp != NULL);
- (void) memmove(fp, fp + len + 1,
- cs->smultis - (fp + len + 1 - cs->multis));
- cs->smultis -= len;
-
- if (cs->smultis == 0) {
- free(cs->multis);
- cs->multis = NULL;
- return;
+ ret = v->treefree;
+ if (ret != NULL)
+ v->treefree = ret->left;
+ else
+ {
+ ret = (struct subre *) MALLOC(sizeof(struct subre));
+ if (ret == NULL)
+ {
+ ERR(REG_ESPACE);
+ return NULL;
+ }
+ ret->chain = v->treechain;
+ v->treechain = ret;
}
- cs->multis = realloc(cs->multis, cs->smultis);
- assert(cs->multis != NULL);
-}
+ assert(strchr("|.b(=", op) != NULL);
-/*
- - mcin - is a collating element in a cset?
- == static int mcin(register cset *cs, register char *cp);
- */
-static int
-mcin(cs, cp)
-register cset *cs;
-register char *cp;
-{
- return(mcfind(cs, cp) != NULL);
+ ret->op = op;
+ ret->flags = flags;
+ ret->retry = 0;
+ ret->subno = 0;
+ ret->min = ret->max = 1;
+ ret->left = NULL;
+ ret->right = NULL;
+ ret->begin = begin;
+ ret->end = end;
+ ZAPCNFA(ret->cnfa);
+
+ return ret;
}
/*
- - mcfind - find a collating element in a cset
- == static char *mcfind(register cset *cs, register char *cp);
+ * freesubre - free a subRE subtree
*/
-static char *
-mcfind(cs, cp)
-register cset *cs;
-register char *cp;
+static void
+freesubre(struct vars * v, /* might be NULL */
+ struct subre * sr)
{
- register char *p;
-
- if (cs->multis == NULL)
- return(NULL);
- for (p = cs->multis; *p != '\0'; p += strlen(p) + 1)
- if (strcmp(cp, p) == 0)
- return(p);
- return(NULL);
+ if (sr == NULL)
+ return;
+
+ if (sr->left != NULL)
+ freesubre(v, sr->left);
+ if (sr->right != NULL)
+ freesubre(v, sr->right);
+
+ freesrnode(v, sr);
}
-#endif /* 0 */
/*
- - mcinvert - invert the list of collating elements in a cset
- == static void mcinvert(register struct parse *p, register cset *cs);
- *
- * This would have to know the set of possibilities. Implementation
- * is deferred.
+ * freesrnode - free one node in a subRE subtree
*/
static void
-mcinvert(p, cs)
-register struct parse *p;
-register cset *cs;
+freesrnode(struct vars * v, /* might be NULL */
+ struct subre * sr)
{
- assert(cs->multis == NULL); /* xxx */
+ if (sr == NULL)
+ return;
+
+ if (!NULLCNFA(sr->cnfa))
+ freecnfa(&sr->cnfa);
+ sr->flags = 0;
+
+ if (v != NULL)
+ {
+ sr->left = v->treefree;
+ v->treefree = sr;
+ }
+ else
+ FREE(sr);
}
/*
- - mccase - add case counterparts of the list of collating elements in a cset
- == static void mccase(register struct parse *p, register cset *cs);
- *
- * This would have to know the set of possibilities. Implementation
- * is deferred.
+ * optst - optimize a subRE subtree
*/
static void
-mccase(p, cs)
-register struct parse *p;
-register cset *cs;
+optst(struct vars * v,
+ struct subre * t)
{
- assert(cs->multis == NULL); /* xxx */
+ if (t == NULL)
+ return;
+
+ /* recurse through children */
+ if (t->left != NULL)
+ optst(v, t->left);
+ if (t->right != NULL)
+ optst(v, t->right);
}
/*
- - isinsets - is this character in any sets?
- == static int isinsets(register struct re_guts *g, int c);
+ * numst - number tree nodes (assigning retry indexes)
*/
-static int /* predicate */
-isinsets(g, c)
-register struct re_guts *g;
-int c;
+static int /* next number */
+numst(struct subre * t,
+ int start) /* starting point for subtree numbers */
{
- register uch *col;
- register int i;
- register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
- register unsigned uc = (unsigned char)c;
-
- for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
- if (col[uc] != 0)
- return(1);
- return(0);
+ int i;
+
+ assert(t != NULL);
+
+ i = start;
+ t->retry = (short) i++;
+ if (t->left != NULL)
+ i = numst(t->left, i);
+ if (t->right != NULL)
+ i = numst(t->right, i);
+ return i;
}
/*
- - samesets - are these two characters in exactly the same sets?
- == static int samesets(register struct re_guts *g, int c1, int c2);
+ * markst - mark tree nodes as INUSE
*/
-static int /* predicate */
-samesets(g, c1, c2)
-register struct re_guts *g;
-int c1;
-int c2;
+static void
+markst(struct subre * t)
{
- register uch *col;
- register int i;
- register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
- register unsigned uc1 = (unsigned char)c1;
- register unsigned uc2 = (unsigned char)c2;
-
- for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
- if (col[uc1] != col[uc2])
- return(0);
- return(1);
+ assert(t != NULL);
+
+ t->flags |= INUSE;
+ if (t->left != NULL)
+ markst(t->left);
+ if (t->right != NULL)
+ markst(t->right);
}
/*
- - categorize - sort out character categories
- == static void categorize(struct parse *p, register struct re_guts *g);
+ * cleanst - free any tree nodes not marked INUSE
*/
static void
-categorize(p, g)
-struct parse *p;
-register struct re_guts *g;
+cleanst(struct vars * v)
{
- register cat_t *cats = g->categories;
- register int c;
- register int c2;
- register cat_t cat;
-
- /* avoid making error situations worse */
- if (p->error != 0)
- return;
-
- for (c = CHAR_MIN; c <= CHAR_MAX; c++)
- if (cats[c] == 0 && isinsets(g, c)) {
- cat = g->ncategories++;
- cats[c] = cat;
- for (c2 = c+1; c2 <= CHAR_MAX; c2++)
- if (cats[c2] == 0 && samesets(g, c, c2))
- cats[c2] = cat;
+ struct subre *t;
+ struct subre *next;
+
+ for (t = v->treechain; t != NULL; t = next)
+ {
+ next = t->chain;
+ if (!(t->flags & INUSE))
+ FREE(t);
}
+ v->treechain = NULL;
+ v->treefree = NULL; /* just on general principles */
}
/*
- - dupl - emit a duplicate of a bunch of sops
- == static sopno dupl(register struct parse *p, sopno start, sopno finish);
+ * nfatree - turn a subRE subtree into a tree of compacted NFAs
*/
-static sopno /* start of duplicate */
-dupl(p, start, finish)
-register struct parse *p;
-sopno start; /* from here */
-sopno finish; /* to this less one */
+static long /* optimize results from top node */
+nfatree(struct vars * v,
+ struct subre * t,
+ FILE *f) /* for debug output */
{
- register sopno ret = HERE();
- register sopno len = finish - start;
-
- assert(finish >= start);
- if (len == 0)
- return(ret);
- enlarge(p, p->ssize + len); /* this many unexpected additions */
- assert(p->ssize >= p->slen + len);
- (void) memcpy((char *)(p->strip + p->slen),
- (char *)(p->strip + start), (size_t)len*sizeof(sop));
- p->slen += len;
- return(ret);
+ assert(t != NULL && t->begin != NULL);
+
+ if (t->left != NULL)
+ (DISCARD) nfatree(v, t->left, f);
+ if (t->right != NULL)
+ (DISCARD) nfatree(v, t->right, f);
+
+ return nfanode(v, t, f);
}
/*
- - doemit - emit a strip operator
- == static void doemit(register struct parse *p, sop op, size_t opnd);
- *
- * It might seem better to implement this as a macro with a function as
- * hard-case backup, but it's just too big and messy unless there are
- * some changes to the data structures. Maybe later.
+ * nfanode - do one NFA for nfatree
*/
-static void
-doemit(p, op, opnd)
-register struct parse *p;
-sop op;
-size_t opnd;
+static long /* optimize results */
+nfanode(struct vars * v,
+ struct subre * t,
+ FILE *f) /* for debug output */
{
- /* avoid making error situations worse */
- if (p->error != 0)
- return;
+ struct nfa *nfa;
+ long ret = 0;
- /* deal with oversize operands ("can't happen", more or less) */
- assert(opnd < 1<<OPSHIFT);
+ assert(t->begin != NULL);
- /* deal with undersized strip */
- if (p->slen >= p->ssize)
- enlarge(p, (p->ssize+1) / 2 * 3); /* +50% */
- assert(p->slen < p->ssize);
+#ifdef REG_DEBUG
+ if (f != NULL)
+ {
+ char idbuf[50];
- /* finally, it's all reduced to the easy case */
- p->strip[p->slen++] = SOP(op, opnd);
+ fprintf(f, "\n\n\n========= TREE NODE %s ==========\n",
+ stid(t, idbuf, sizeof(idbuf)));
+ }
+#endif
+ nfa = newnfa(v, v->cm, v->nfa);
+ NOERRZ();
+ dupnfa(nfa, t->begin, t->end, nfa->init, nfa->final);
+ if (!ISERR())
+ {
+ specialcolors(nfa);
+ ret = optimize(nfa, f);
+ }
+ if (!ISERR())
+ compact(nfa, &t->cnfa);
+
+ freenfa(nfa);
+ return ret;
}
/*
- - doinsert - insert a sop into the strip
- == static void doinsert(register struct parse *p, sop op, size_t opnd, sopno pos);
+ * newlacon - allocate a lookahead-constraint subRE
*/
-static void
-doinsert(p, op, opnd, pos)
-register struct parse *p;
-sop op;
-size_t opnd;
-sopno pos;
+static int /* lacon number */
+newlacon(struct vars * v,
+ struct state * begin,
+ struct state * end,
+ int pos)
{
- register sopno sn;
- register sop s;
- register int i;
-
- /* avoid making error situations worse */
- if (p->error != 0)
- return;
-
- sn = HERE();
- EMIT(op, opnd); /* do checks, ensure space */
- assert(HERE() == sn+1);
- s = p->strip[sn];
-
- /* adjust paren pointers */
- assert(pos > 0);
- for (i = 1; i < NPAREN; i++) {
- if (p->pbegin[i] >= pos) {
- p->pbegin[i]++;
+ int n;
+ struct subre *sub;
+
+ if (v->nlacons == 0)
+ {
+ v->lacons = (struct subre *) MALLOC(2 * sizeof(struct subre));
+ n = 1; /* skip 0th */
+ v->nlacons = 2;
}
- if (p->pend[i] >= pos) {
- p->pend[i]++;
+ else
+ {
+ v->lacons = (struct subre *) REALLOC(v->lacons,
+ (v->nlacons + 1) * sizeof(struct subre));
+ n = v->nlacons++;
}
+ if (v->lacons == NULL)
+ {
+ ERR(REG_ESPACE);
+ return 0;
}
-
- memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos],
- (HERE()-pos-1)*sizeof(sop));
- p->strip[pos] = s;
+ sub = &v->lacons[n];
+ sub->begin = begin;
+ sub->end = end;
+ sub->subno = pos;
+ ZAPCNFA(sub->cnfa);
+ return n;
}
/*
- - dofwd - complete a forward reference
- == static void dofwd(register struct parse *p, sopno pos, sop value);
+ * freelacons - free lookahead-constraint subRE vector
*/
static void
-dofwd(p, pos, value)
-register struct parse *p;
-register sopno pos;
-sop value;
+freelacons(struct subre * subs,
+ int n)
{
- /* avoid making error situations worse */
- if (p->error != 0)
- return;
-
- assert(value < 1<<OPSHIFT);
- p->strip[pos] = OP(p->strip[pos]) | value;
+ struct subre *sub;
+ int i;
+
+ assert(n > 0);
+ for (sub = subs + 1, i = n - 1; i > 0; sub++, i--) /* no 0th */
+ if (!NULLCNFA(sub->cnfa))
+ freecnfa(&sub->cnfa);
+ FREE(subs);
}
/*
- - enlarge - enlarge the strip
- == static void enlarge(register struct parse *p, sopno size);
+ * rfree - free a whole RE (insides of regfree)
*/
static void
-enlarge(p, size)
-register struct parse *p;
-register sopno size;
+rfree(regex_t *re)
{
- register sop *sp;
+ struct guts *g;
- if (p->ssize >= size)
+ if (re == NULL || re->re_magic != REMAGIC)
return;
- sp = (sop *)realloc(p->strip, size*sizeof(sop));
- if (sp == NULL) {
- SETERROR(REG_ESPACE);
- return;
- }
- p->strip = sp;
- p->ssize = size;
+ re->re_magic = 0; /* invalidate RE */
+ g = (struct guts *) re->re_guts;
+ re->re_guts = NULL;
+ re->re_fns = NULL;
+ g->magic = 0;
+ freecm(&g->cmap);
+ if (g->tree != NULL)
+ freesubre((struct vars *) NULL, g->tree);
+ if (g->lacons != NULL)
+ freelacons(g->lacons, g->nlacons);
+ if (!NULLCNFA(g->search))
+ freecnfa(&g->search);
+ FREE(g);
}
+#ifdef REG_DEBUG
+
/*
- - stripsnug - compact the strip
- == static void stripsnug(register struct parse *p, register struct re_guts *g);
+ * dump - dump an RE in human-readable form
*/
static void
-stripsnug(p, g)
-register struct parse *p;
-register struct re_guts *g;
+dump(regex_t *re,
+ FILE *f)
{
- g->nstates = p->slen;
- g->strip = (sop *)realloc((char *)p->strip, p->slen * sizeof(sop));
- if (g->strip == NULL) {
- SETERROR(REG_ESPACE);
- g->strip = p->strip;
+ struct guts *g;
+ int i;
+
+ if (re->re_magic != REMAGIC)
+ fprintf(f, "bad magic number (0x%x not 0x%x)\n", re->re_magic,
+ REMAGIC);
+ if (re->re_guts == NULL)
+ {
+ fprintf(f, "NULL guts!!!\n");
+ return;
}
+ g = (struct guts *) re->re_guts;
+ if (g->magic != GUTSMAGIC)
+ fprintf(f, "bad guts magic number (0x%x not 0x%x)\n", g->magic,
+ GUTSMAGIC);
+
+ fprintf(f, "\n\n\n========= DUMP ==========\n");
+ fprintf(f, "nsub %d, info 0%lo, csize %d, ntree %d\n",
+ re->re_nsub, re->re_info, re->re_csize, g->ntree);
+
+ dumpcolors(&g->cmap, f);
+ if (!NULLCNFA(g->search))
+ {
+ printf("\nsearch:\n");
+ dumpcnfa(&g->search, f);
+ }
+ for (i = 1; i < g->nlacons; i++)
+ {
+ fprintf(f, "\nla%d (%s):\n", i,
+ (g->lacons[i].subno) ? "positive" : "negative");
+ dumpcnfa(&g->lacons[i].cnfa, f);
+ }
+ fprintf(f, "\n");
+ dumpst(g->tree, f, 0);
}
/*
- - findmust - fill in must and mlen with longest mandatory literal string
- == static void findmust(register struct parse *p, register struct re_guts *g);
- *
- * This algorithm could do fancy things like analyzing the operands of |
- * for common subsequences. Someday. This code is simple and finds most
- * of the interesting cases.
- *
- * Note that must and mlen got initialized during setup.
+ * dumpst - dump a subRE tree
*/
static void
-findmust(p, g)
-struct parse *p;
-register struct re_guts *g;
+dumpst(struct subre * t,
+ FILE *f,
+ int nfapresent) /* is the original NFA still around? */
{
- register sop *scan;
- sop *start;
- register sop *newstart;
- register sopno newlen;
- register sop s;
- register char *cp;
- register sopno i;
-
- /* avoid making error situations worse */
- if (p->error != 0)
- return;
-
- /* find the longest OCHAR sequence in strip */
- newlen = 0;
- scan = g->strip + 1;
- do {
- s = *scan++;
- switch (OP(s)) {
- case OCHAR: /* sequence member */
- if (newlen == 0) /* new sequence */
- newstart = scan - 1;
- newlen++;
- break;
- case OPLUS_: /* things that don't break one */
- case OLPAREN:
- case ORPAREN:
- break;
- case OQUEST_: /* things that must be skipped */
- case OCH_:
- scan--;
- do {
- scan += OPND(s);
- s = *scan;
- /* assert() interferes w debug printouts */
- if (OP(s) != O_QUEST && OP(s) != O_CH &&
- OP(s) != OOR2) {
- g->iflags |= BAD;
- return;
- }
- } while (OP(s) != O_QUEST && OP(s) != O_CH);
- /* fallthrough */
- default: /* things that break a sequence */
- if (newlen > g->mlen) { /* ends one */
- start = newstart;
- g->mlen = newlen;
- }
- newlen = 0;
- break;
- }
- } while (OP(s) != OEND);
-
- if (g->mlen == 0) /* there isn't one */
- return;
+ if (t == NULL)
+ fprintf(f, "null tree\n");
+ else
+ stdump(t, f, nfapresent);
+ fflush(f);
+}
- /* turn it into a character string */
- g->must = malloc((size_t)g->mlen + 1);
- if (g->must == NULL) { /* argh; just forget it */
- g->mlen = 0;
- return;
+/*
+ * stdump - recursive guts of dumpst
+ */
+static void
+stdump(struct subre * t,
+ FILE *f,
+ int nfapresent) /* is the original NFA still around? */
+{
+ char idbuf[50];
+
+ fprintf(f, "%s. `%c'", stid(t, idbuf, sizeof(idbuf)), t->op);
+ if (t->flags & LONGER)
+ fprintf(f, " longest");
+ if (t->flags & SHORTER)
+ fprintf(f, " shortest");
+ if (t->flags & MIXED)
+ fprintf(f, " hasmixed");
+ if (t->flags & CAP)
+ fprintf(f, " hascapture");
+ if (t->flags & BACKR)
+ fprintf(f, " hasbackref");
+ if (!(t->flags & INUSE))
+ fprintf(f, " UNUSED");
+ if (t->subno != 0)
+ fprintf(f, " (#%d)", t->subno);
+ if (t->min != 1 || t->max != 1)
+ {
+ fprintf(f, " {%d,", t->min);
+ if (t->max != INFINITY)
+ fprintf(f, "%d", t->max);
+ fprintf(f, "}");
}
- cp = g->must;
- scan = start;
- for (i = g->mlen; i > 0; i--) {
- while (OP(s = *scan++) != OCHAR)
- continue;
- assert(cp < g->must + g->mlen);
- *cp++ = (char)OPND(s);
+ if (nfapresent)
+ fprintf(f, " %ld-%ld", (long) t->begin->no, (long) t->end->no);
+ if (t->left != NULL)
+ fprintf(f, " L:%s", stid(t->left, idbuf, sizeof(idbuf)));
+ if (t->right != NULL)
+ fprintf(f, " R:%s", stid(t->right, idbuf, sizeof(idbuf)));
+ if (!NULLCNFA(t->cnfa))
+ {
+ fprintf(f, "\n");
+ dumpcnfa(&t->cnfa, f);
+ fprintf(f, "\n");
}
- assert(cp == g->must + g->mlen);
- *cp++ = '\0'; /* just on general principles */
+ if (t->left != NULL)
+ stdump(t->left, f, nfapresent);
+ if (t->right != NULL)
+ stdump(t->right, f, nfapresent);
}
/*
- - pluscount - count + nesting
- == static sopno pluscount(register struct parse *p, register struct re_guts *g);
+ * stid - identify a subtree node for dumping
*/
-static sopno /* nesting depth */
-pluscount(p, g)
-struct parse *p;
-register struct re_guts *g;
+static char * /* points to buf or constant string */
+stid(struct subre * t,
+ char *buf,
+ size_t bufsize)
{
- register sop *scan;
- register sop s;
- register sopno plusnest = 0;
- register sopno maxnest = 0;
-
- if (p->error != 0)
- return(0); /* there may not be an OEND */
-
- scan = g->strip + 1;
- do {
- s = *scan++;
- switch (OP(s)) {
- case OPLUS_:
- plusnest++;
- break;
- case O_PLUS:
- if (plusnest > maxnest)
- maxnest = plusnest;
- plusnest--;
- break;
- }
- } while (OP(s) != OEND);
- if (plusnest != 0)
- g->iflags |= BAD;
- return(maxnest);
+ /* big enough for hex int or decimal t->retry? */
+ if (bufsize < sizeof(int) * 2 + 3 || bufsize < sizeof(t->retry) * 3 + 1)
+ return "unable";
+ if (t->retry != 0)
+ sprintf(buf, "%d", t->retry);
+ else
+ sprintf(buf, "0x%x", (int) t); /* may lose bits, that's okay */
+ return buf;
}
+#endif /* REG_DEBUG */
+
+
+#include "regc_lex.c"
+#include "regc_color.c"
+#include "regc_nfa.c"
+#include "regc_cvec.c"
+#include "regc_locale.c"
/*
- * the outer shell of regexec()
+ * re_*exec and friends - match REs
*
- * 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.
- */
-#if defined(__MWERKS__) && !defined(__MACH__)
-typedef long off_t ;
-#else
-#include <sys/types.h>
-#endif
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <ctype.h>
-#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
+ * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
*
- * 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 eflags;
-{
- 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));
+ * 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.
+ *
+ * $Header: /projects/cvsroot/pgsql-server/src/backend/regex/regexec.c,v 1.23 2003/08/08 21:41:56 momjian Exp $
+ *
+ */
+
+#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
+ */
+/* === regexec.c === */
+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 zapsubs(regmatch_t *, size_t);
+static void zapmem(struct vars *, struct subre *);
+static void subset(struct vars *, struct subre *, chr *, chr *);
+static int dissect(struct vars *, struct subre *, chr *, chr *);
+static int condissect(struct vars *, struct subre *, chr *, chr *);
+static int altdissect(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 crevdissect(struct vars *, struct subre *, chr *, chr *);
+static int cbrdissect(struct vars *, struct subre *, chr *, chr *);
+static int caltdissect(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 *);
+
+
+/*
+ * regexec - match regular expression
+ */
+int
+regexec(regex_t *re,
+ const chr *string,
+ size_t nmatch,
+ regmatch_t pmatch[],
+ int flags)
+{
+ rm_detail_t det;
+ size_t nLen = 0;
+ chr* s2 = (chr*) string;
+
+ if (string && *string)
+ {
+ while(*++s2);
+ }
+
+ nLen = ((s2 - string) / sizeof(chr));
+
+ return wx_regexec(re, string, nLen, &det, nmatch, pmatch, flags);
+}
+int
+wx_regexec(regex_t *re,
+ const chr *string,
+ size_t len,
+ 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;
+ 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 & 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->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);
+ 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 * 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 & 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;
+
+ /* 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 * 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->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 *p,
+ size_t n)
+{
+ size_t i;
+
+ for (i = n - 1; i > 0; i--)
+ {
+ p[i].rm_so = -1;
+ p[i].rm_eo = -1;
+ }
+}
+
+/*
+ * zapmem - initialize the retry memory of a subtree to zeros
+ */
+static void
+zapmem(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 * 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 /* regexec return code */
+dissect(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 /* regexec return code */
+condissect(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
- return(lmatcher(g, (char *)string, nmatch, pmatch, eflags));
+ 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 /* regexec return code */
+altdissect(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 /* 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));
+
+ 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 /* 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);
+
+ 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 /* regexec return code */
+crevdissect(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 /* regexec return code */
+cbrdissect(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 /* 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;
+
+#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"
projects / wxWidgets.git / commitdiff
