regcomp.c File Reference

#include "regex/regguts.h"
#include "regc_lex.c"
#include "regc_color.c"
#include "regc_nfa.c"
#include "regc_cvec.c"
#include "regc_pg_locale.c"
#include "regc_locale.c"

Include dependency graph for regcomp.c:

Go to the source code of this file.

Data Structures
struct	vars

Macros
#define	INCOMPATIBLE   1 /* destroys arc */
#define	SATISFIED   2 /* constraint satisfied */
#define	COMPATIBLE   3 /* compatible but not satisfied yet */
#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)
#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)   do { if (!(c)) ERR(e); } while (0) /* error if c false */
#define	NOTE(b)   (v->re->re_info |= (b)) /* note visible condition */
#define	EMPTYARC(x, y)   newarc(v->nfa, EMPTY, 0, x, y)
#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' /* lookaround 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 */
#define	COLORED(a)   ((a)->type == PLAIN || (a)->type == AHEAD || (a)->type == BEHIND)
#define	CNOERR()   { if (ISERR()) return freev(v, v->err); }
#define	ARCV(t, val)   newarc(v->nfa, t, val, lp, rp)
#define	SOME   2
#define	INF   3
#define	PAIR(x, y)   ((x)*4 + (y))
#define	REDUCE(x)   ( ((x) == DUPINF) ? INF : (((x) > 1) ? SOME : (x)) )

Functions
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 const chr *	scanplain (struct vars *)
static void	onechr (struct vars *, chr, struct state *, struct state *)
static void	wordchrs (struct vars *)
static void	processlacon (struct vars *, struct state *, struct state *, int, struct state *, struct state *)
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 *, int, FILE *)
static int	newlacon (struct vars *, struct state *, struct state *, int)
static void	freelacons (struct subre *, int)
static void	rfree (regex_t *)
static int	rcancelrequested (void)
static int	rstacktoodeep (void)
static void	lexstart (struct vars *)
static void	prefixes (struct vars *)
static void	lexnest (struct vars *, const chr *, const 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 *, const chr *, const chr *, chr)
static void	initcm (struct vars *, struct colormap *)
static void	freecm (struct colormap *)
static color	maxcolor (struct colormap *)
static color	newcolor (struct colormap *)
static void	freecolor (struct colormap *, color)
static color	pseudocolor (struct colormap *)
static color	subcolor (struct colormap *, chr)
static color	subcolorhi (struct colormap *, color *)
static color	newsub (struct colormap *, color)
static int	newhicolorrow (struct colormap *, int)
static void	newhicolorcols (struct colormap *)
static void	subcolorcvec (struct vars *, struct cvec *, struct state *, struct state *)
static void	subcoloronechr (struct vars *, chr, struct state *, struct state *, color *)
static void	subcoloronerange (struct vars *, chr, chr, struct state *, struct state *, color *)
static void	subcoloronerow (struct vars *, int, struct state *, struct state *, color *)
static void	okcolors (struct nfa *, struct colormap *)
static void	colorchain (struct colormap *, struct arc *)
static void	uncolorchain (struct colormap *, struct arc *)
static void	rainbow (struct nfa *, struct colormap *, int, color, struct state *, struct state *)
static void	colorcomplement (struct nfa *, struct colormap *, int, struct state *, struct state *, struct state *)
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, color, struct state *, struct state *)
static void	createarc (struct nfa *, int, color, struct state *, struct state *)
static struct arc *	allocarc (struct nfa *, struct state *)
static void	freearc (struct nfa *, struct arc *)
static void	changearctarget (struct arc *, struct state *)
static int	hasnonemptyout (struct state *)
static struct arc *	findarc (struct state *, int, color)
static void	cparc (struct nfa *, struct arc *, struct state *, struct state *)
static void	sortins (struct nfa *, struct state *)
static int	sortins_cmp (const void *, const void *)
static void	sortouts (struct nfa *, struct state *)
static int	sortouts_cmp (const void *, const void *)
static void	moveins (struct nfa *, struct state *, struct state *)
static void	copyins (struct nfa *, struct state *, struct state *)
static void	mergeins (struct nfa *, struct state *, struct arc **, int)
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 struct state *	single_color_transition (struct state *, 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 *, struct state **)
static void	pushfwd (struct nfa *, FILE *)
static int	push (struct nfa *, struct arc *, struct state **)
static int	combine (struct arc *, struct arc *)
static void	fixempties (struct nfa *, FILE *)
static struct state *	emptyreachable (struct nfa *, struct state *, struct state *, struct arc **)
static int	isconstraintarc (struct arc *)
static int	hasconstraintout (struct state *)
static void	fixconstraintloops (struct nfa *, FILE *)
static int	findconstraintloop (struct nfa *, struct state *)
static void	breakconstraintloop (struct nfa *, struct state *)
static void	clonesuccessorstates (struct nfa *, struct state *, struct state *, struct state *, struct arc *, char *, char *, int)
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 *, size_t)
static int	carc_cmp (const void *, const void *)
static void	freecnfa (struct cnfa *)
static void	dumpnfa (struct nfa *, FILE *)
static struct cvec *	newcvec (int, int)
static struct cvec *	clearcvec (struct cvec *)
static void	addchr (struct cvec *, chr)
static void	addrange (struct cvec *, chr, chr)
static struct cvec *	getcvec (struct vars *, int, int)
static void	freecvec (struct cvec *)
static int	pg_wc_isdigit (pg_wchar c)
static int	pg_wc_isalpha (pg_wchar c)
static int	pg_wc_isalnum (pg_wchar c)
static int	pg_wc_isupper (pg_wchar c)
static int	pg_wc_islower (pg_wchar c)
static int	pg_wc_isgraph (pg_wchar c)
static int	pg_wc_isprint (pg_wchar c)
static int	pg_wc_ispunct (pg_wchar c)
static int	pg_wc_isspace (pg_wchar c)
static pg_wchar	pg_wc_toupper (pg_wchar c)
static pg_wchar	pg_wc_tolower (pg_wchar c)
static chr	element (struct vars *, const chr *, const chr *)
static struct cvec *	range (struct vars *, chr, chr, int)
static int	before (chr, chr)
static struct cvec *	eclass (struct vars *, chr, int)
static struct cvec *	cclass (struct vars *, const chr *, const chr *, int)
static int	cclass_column_index (struct colormap *, chr)
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)
int	pg_regcomp (regex_t *re, const chr *string, size_t len, int flags, Oid collation)

Variables
static const struct fns	functions

Macro Definition Documentation

AHEAD

#define AHEAD   'a' /* color-lookahead arc */

Definition at line 285 of file regcomp.c.

Referenced by combine(), dumpnfa(), isconstraintarc(), nonword(), parseqatom(), processlacon(), pushfwd(), and word().

ARCV

#define ARCV	(		t,
			val
	)		newarc(v->nfa, t, val, lp, rp)

Referenced by parseqatom().

BACKREF

#define BACKREF   'b' /* back reference */

Definition at line 278 of file regcomp.c.

Referenced by brenext(), lexescape(), and parseqatom().

BEHIND

#define BEHIND   'r' /* color-lookbehind arc */

Definition at line 286 of file regcomp.c.

Referenced by combine(), dumpnfa(), isconstraintarc(), nonword(), parseqatom(), processlacon(), pullback(), and word().

CCLASS

#define CCLASS   'C' /* start of [: */

Definition at line 281 of file regcomp.c.

Referenced by brackpart(), lexescape(), next(), and scanplain().

CNOERR

#define CNOERR

(

)

{ if (ISERR()) return freev(v, v->err); }

Referenced by pg_regcomp().

COLLEL

#define COLLEL   'I' /* start of [. */

Definition at line 279 of file regcomp.c.

Referenced by brackpart(), next(), and scanplain().

COLORED

#define COLORED

(

a

)

((a)->type == PLAIN || (a)->type == AHEAD || (a)->type == BEHIND)

Definition at line 294 of file regcomp.c.

Referenced by createarc(), and freearc().

COMPATIBLE

#define COMPATIBLE   3 /* compatible but not satisfied yet */

Definition at line 160 of file regcomp.c.

Referenced by combine(), pull(), and push().

DIGIT

#define DIGIT   'd' /* digit (in bound) */

Definition at line 277 of file regcomp.c.

Referenced by next(), parseqatom(), and scannum().

EAT

#define EAT

(

t

)

(SEE(t) && next(v)) /* if next is this, swallow it */

Definition at line 260 of file regcomp.c.

Referenced by parse(), and parseqatom().

ECLASS

#define ECLASS   'E' /* start of [= */

Definition at line 280 of file regcomp.c.

Referenced by brackpart(), next(), and scanplain().

EMPTY

#define EMPTY   'n' /* no token present */

Definition at line 274 of file regcomp.c.

Referenced by brenext(), dumpnfa(), dupnfa(), emptyreachable(), fixempties(), hashline_number(), hasnonemptyout(), lexstart(), next(), and single_color_transition().

EMPTYARC

#define EMPTYARC	(		x,
			y
	)		newarc(v->nfa, EMPTY, 0, x, y)

Definition at line 271 of file regcomp.c.

Referenced by parse(), parsebranch(), parseqatom(), and repeat().

END

#define END   'X' /* end of [. [= [: */

Definition at line 282 of file regcomp.c.

Referenced by scanplain().

EOS

#define EOS   'e' /* end of string */

Definition at line 275 of file regcomp.c.

Referenced by bracket(), next(), parse(), parsebranch(), parseqatom(), and pg_regcomp().

ERR

#define ERR

(

e

)

VERR(v, e) /* record an error */

Definition at line 265 of file regcomp.c.

Referenced by brackpart(), freev(), moresubs(), newlacon(), parse(), parseqatom(), repeat(), scannum(), and subre().

INCOMPATIBLE

#define INCOMPATIBLE   1 /* destroys arc */

Definition at line 158 of file regcomp.c.

Referenced by combine(), pull(), and push().

INF

#define INF   3

Referenced by repeat().

INSIST

#define INSIST	(		c,
			e
	)		do { if (!(c)) ERR(e); } while (0) /* error if c false */

Definition at line 269 of file regcomp.c.

Referenced by brackpart(), and parseqatom().

ISERR

#define ISERR

(

)

VISERR(v)

Definition at line 262 of file regcomp.c.

Referenced by bracket(), lexescape(), longest(), miss(), newnfa(), next(), nfanode(), parseqatom(), scanplain(), and wordchrs().

LACON

#define LACON   'L' /* lookaround constraint subRE */

Definition at line 284 of file regcomp.c.

Referenced by combine(), compact(), dumpnfa(), isconstraintarc(), next(), parseqatom(), and processlacon().

NEXT

#define NEXT

(

)

(next(v)) /* advance by one token */

Definition at line 258 of file regcomp.c.

Referenced by bracket(), brackpart(), parseqatom(), scannum(), scanplain(), and wordchrs().

NOERR

#define NOERR

(

)

{if (ISERR()) return;} /* if error seen, return */

Definition at line 266 of file regcomp.c.

Referenced by brackpart(), cbracket(), lexstart(), makesearch(), parseqatom(), repeat(), subcolorcvec(), subcoloronechr(), subcoloronerow(), and wordchrs().

NOERRN

#define NOERRN

(

)

{if (ISERR()) return NULL;} /* NOERR with retval */

Definition at line 267 of file regcomp.c.

Referenced by parse(), parsebranch(), and range().

NOERRZ

#define NOERRZ

(

)

{if (ISERR()) return 0;} /* NOERR with retval */

Definition at line 268 of file regcomp.c.

Referenced by nfanode().

NOTE

#define NOTE

(

b

)

(v->re->re_info |= (b)) /* note visible condition */

Definition at line 270 of file regcomp.c.

Referenced by brackpart(), brenext(), element(), lexescape(), next(), parsebranch(), parseqatom(), pg_regcomp(), prefixes(), and skip().

NWBDRY

#define NWBDRY   'W' /* non-word-boundary constraint */

Definition at line 288 of file regcomp.c.

Referenced by lexescape(), and parseqatom().

PAIR

#define PAIR	(		x,
			y
	)		((x)*4 + (y))

Referenced by repeat().

PLAIN

#define PLAIN   'p' /* ordinary character */

Definition at line 276 of file regcomp.c.

Referenced by brackpart(), brenext(), cbracket(), colorcomplement(), combine(), compact(), dumpnfa(), lexescape(), makesearch(), newnfa(), next(), parseqatom(), pg_regcomp(), pullback(), pushfwd(), scanplain(), single_color_transition(), subcolorcvec(), subcoloronechr(), and subcoloronerow().

PREFER

#define PREFER   'P' /* length preference */

Definition at line 291 of file regcomp.c.

RANGE

#define RANGE   'R' /* - within [] which might be range delim. */

Definition at line 283 of file regcomp.c.

Referenced by brackpart(), and next().

REDUCE

#define REDUCE

(

x

)

( ((x) == DUPINF) ? INF : (((x) > 1) ? SOME : (x)) )

Referenced by repeat().

SATISFIED

#define SATISFIED   2 /* constraint satisfied */

Definition at line 159 of file regcomp.c.

Referenced by combine(), pull(), and push().

SBEGIN

#define SBEGIN   'A' /* beginning of string (even if not BOL) */

Definition at line 289 of file regcomp.c.

Referenced by lexescape(), next(), and parseqatom().

SEE

#define SEE

(

t

)

(v->nexttype == (t)) /* is next token this? */

Definition at line 259 of file regcomp.c.

Referenced by bracket(), brackpart(), parse(), parsebranch(), parseqatom(), pg_regcomp(), scannum(), scanplain(), and wordchrs().

SEND

#define SEND   'Z' /* end of string (even if not EOL) */

Definition at line 290 of file regcomp.c.

Referenced by lexescape(), and parseqatom().

SOME

#define SOME   2

Referenced by repeat().

VERR

#define VERR	(		vv,
			e
	)

Value:

((vv)->nexttype = EOS, \
                     (vv)->err = ((vv)->err ? (vv)->err : (e)))

Definition at line 263 of file regcomp.c.

VISERR

#define VISERR

(

vv

)

((vv)->err != 0) /* have we seen an error yet? */

Definition at line 261 of file regcomp.c.

WBDRY

#define WBDRY   'w' /* word boundary constraint */

Definition at line 287 of file regcomp.c.

Referenced by lexescape(), and parseqatom().

Function Documentation

addchr()

static void addchr ( struct cvec *  , chr    )

static

addrange()

static void addrange ( struct cvec *  , chr  , chr    )

static

allcases()

static struct cvec* allcases ( struct vars *  , chr    )

static

Referenced by onechr().

allocarc()

static struct arc* allocarc ( struct nfa *  , struct state *    )

static

analyze()

static long analyze ( struct nfa *  )

static

before()

static int before ( chr  , chr    )

static

bracket()

static void bracket ( struct vars *  v, struct state *  lp, struct state *  rp  )

static

Definition at line 1375 of file regcomp.c.

References assert, brackpart(), vars::cm, EOS, ISERR, NEXT, vars::nfa, okcolors(), and SEE.

Referenced by cbracket(), parseqatom(), and wordchrs().

{
    assert(SEE('['));
    NEXT();
    while (!SEE(']') && !SEE(EOS))
        brackpart(v, lp, rp);
    assert(SEE(']') || ISERR());
    okcolors(v->nfa, v->cm);
}

brackpart()

static void brackpart ( struct vars *  v, struct state *  lp, struct state *  rp  )

static

Definition at line 1424 of file regcomp.c.

References cclass(), CCLASS, vars::cflags, COLLEL, vars::cv, eclass(), ECLASS, element(), ERR, INSIST, NEXT, vars::nexttype, vars::nextvalue, NOERR, NOTE, vars::now, onechr(), PLAIN, range(), RANGE, REG_ASSERT, REG_ECOLLATE, REG_ECTYPE, REG_ERANGE, REG_ICASE, REG_UUNPORT, scanplain(), SEE, and subcolorcvec().

Referenced by bracket().

{
    chr         startc;
    chr         endc;
    struct cvec *cv;
    const chr  *startp;
    const 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 PLAIN:
            c[0] = v->nextvalue;
            NEXT();
            /* shortcut for ordinary chr (not range) */
            if (!SEE(RANGE))
            {
                onechr(v, c[0], lp, rp);
                return;
            }
            startc = element(v, c, c + 1);
            NOERR();
            break;
        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();
            subcolorcvec(v, cv, lp, rp);
            return;
            break;
        case CCLASS:
            startp = v->now;
            endp = scanplain(v);
            INSIST(startp < endp, REG_ECTYPE);
            NOERR();
            cv = cclass(v, startp, endp, (v->cflags & REG_ICASE));
            NOERR();
            subcolorcvec(v, cv, lp, rp);
            return;
            break;
        default:
            ERR(REG_ASSERT);
            return;
            break;
    }

    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 COLLEL:
                startp = v->now;
                endp = scanplain(v);
                INSIST(startp < endp, REG_ECOLLATE);
                NOERR();
                endc = element(v, startp, endp);
                NOERR();
                break;
            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();
    subcolorcvec(v, cv, lp, rp);
}

breakconstraintloop()

static void breakconstraintloop ( struct nfa *  , struct state *    )

static

brenext()

static int brenext ( struct vars *  , chr    )

static

carc_cmp()

static int carc_cmp ( const void *  , const void *    )

static

carcsort()

static void carcsort ( struct carc *  , size_t    )

static

casecmp()

static int casecmp ( const chr *  , const chr *  , size_t    )

static

Referenced by pg_regcomp().

cbracket()

static void cbracket ( struct vars *  v, struct state *  lp, struct state *  rp  )

static

Definition at line 1394 of file regcomp.c.

References assert, bracket(), vars::cflags, vars::cm, colorcomplement(), dropstate(), freestate(), newarc(), newstate(), vars::nfa, state::nins, vars::nlcolor, NOERR, state::nouts, PLAIN, and REG_NLSTOP.

Referenced by parseqatom().

{
    struct state *left = newstate(v->nfa);
    struct state *right = newstate(v->nfa);

    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, and all there is to do since the MCCE code
     * was removed.
     */
    colorcomplement(v->nfa, v->cm, PLAIN, left, lp, rp);
    NOERR();
    dropstate(v->nfa, left);
    assert(right->nins == 0);
    freestate(v->nfa, right);
}

cclass()

static struct cvec* cclass ( struct vars *  , const chr *  , const chr *  , int    )

static

Referenced by brackpart().

cclass_column_index()

static int cclass_column_index ( struct colormap *  , chr    )

static

changearctarget()

static void changearctarget ( struct arc *  , struct state *    )

static

chrnamed()

static chr chrnamed ( struct vars *  , const chr *  , const chr *  , chr    )

static

cleanst()

static void cleanst ( struct vars *  v )

static

Definition at line 1846 of file regcomp.c.

References subre::chain, subre::flags, FREE, INUSE, next(), vars::treechain, and vars::treefree.

Referenced by freev(), and pg_regcomp().

{
    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 */
}

cleanup()

static void cleanup ( struct nfa *  )

static

clearcvec()

static struct cvec* clearcvec ( struct cvec *  )

static

cleartraverse()

static void cleartraverse ( struct nfa *  , struct state *    )

static

cloneouts()

static void cloneouts ( struct nfa *  , struct state *  , struct state *  , struct state *  , int    )

static

Referenced by processlacon(), and word().

clonesuccessorstates()

static void clonesuccessorstates ( struct nfa *  , struct state *  , struct state *  , struct state *  , struct arc *  , char *  , char *  , int    )

static

cmp()

static int cmp ( const chr *  , const chr *  , size_t    )

static

Referenced by pg_regcomp().

colorchain()

static void colorchain ( struct colormap *  , struct arc *    )

static

colorcomplement()

static void colorcomplement ( struct nfa *  , struct colormap *  , int  , struct state *  , struct state *  , struct state *    )

static

Referenced by cbracket(), nonword(), and processlacon().

combine()

static int combine ( struct arc *  , struct arc *    )

static

compact()

static void compact ( struct nfa *  , struct cnfa *    )

static

Referenced by nfanode(), and pg_regcomp().

copyins()

static void copyins ( struct nfa *  , struct state *  , struct state *    )

static

copyouts()

static void copyouts ( struct nfa *  , struct state *  , struct state *    )

static

Referenced by makesearch().

cparc()

static void cparc ( struct nfa *  , struct arc *  , struct state *  , struct state *    )

static

Referenced by makesearch().

createarc()

static void createarc ( struct nfa *  , int  , color  , struct state *  , struct state *    )

static

delsub()

static void delsub ( struct nfa *  , struct state *  , struct state *    )

static

Referenced by parseqatom(), and repeat().

deltraverse()

static void deltraverse ( struct nfa *  , struct state *  , struct state *    )

static

destroystate()

static void destroystate ( struct nfa *  , struct state *    )

static

dropstate()

static void dropstate ( struct nfa *  , struct state *    )

static

Referenced by cbracket().

dumpnfa()

static void dumpnfa ( struct nfa *  , FILE *    )

static

Referenced by pg_regcomp().

dupnfa()

static void dupnfa ( struct nfa *  , struct state *  , struct state *  , struct state *  , struct state *    )

static

Referenced by nfanode(), parseqatom(), and repeat().

duptraverse()

static void duptraverse ( struct nfa *  , struct state *  , struct state *    )

static

eclass()

static struct cvec* eclass ( struct vars *  , chr  , int    )

static

Referenced by brackpart().

element()

static chr element ( struct vars *  , const chr *  , const chr *    )

static

Referenced by brackpart().

emptyreachable()

static struct state* emptyreachable ( struct nfa *  , struct state *  , struct state *  , struct arc **    )

static

findarc()

static struct arc* findarc ( struct state *  , int  , color    )

static

findconstraintloop()

static int findconstraintloop ( struct nfa *  , struct state *    )

static

fixconstraintloops()

static void fixconstraintloops ( struct nfa *  , FILE *    )

static

fixempties()

static void fixempties ( struct nfa *  , FILE *    )

static

freearc()

static void freearc ( struct nfa *  , struct arc *    )

static

Referenced by makesearch().

freecm()

static void freecm ( struct colormap *  )

static

Referenced by rfree().

freecnfa()

static void freecnfa ( struct cnfa *  )

static

Referenced by freelacons(), freesrnode(), and rfree().

freecolor()

static void freecolor ( struct colormap *  , color    )

static

freecvec()

static void freecvec ( struct cvec *  )

static

Referenced by freev().

freelacons()

static void freelacons ( struct subre *  subs, int  n  )

static

Definition at line 1963 of file regcomp.c.

References assert, subre::cnfa, FREE, freecnfa(), i, and NULLCNFA.

Referenced by freev(), and rfree().

{
    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);
}

freenfa()

static void freenfa ( struct nfa *  )

static

Referenced by freev(), and nfanode().

freesrnode()

static void freesrnode ( struct vars *  v, struct subre *  sr  )

static

Definition at line 1757 of file regcomp.c.

References subre::cnfa, subre::flags, FREE, freecnfa(), subre::left, NULLCNFA, vars::treechain, and vars::treefree.

Referenced by freesubre().

{
    if (sr == NULL)
        return;

    if (!NULLCNFA(sr->cnfa))
        freecnfa(&sr->cnfa);
    sr->flags = 0;

    if (v != NULL && v->treechain != NULL)
    {
        /* we're still parsing, maybe we can reuse the subre */
        sr->left = v->treefree;
        v->treefree = sr;
    }
    else
        FREE(sr);
}

freestate()

static void freestate ( struct nfa *  , struct state *    )

static

Referenced by cbracket().

freesubre()

static void freesubre ( struct vars *  v, struct subre *  sr  )

static

Definition at line 1739 of file regcomp.c.

References freesrnode(), subre::left, and subre::right.

Referenced by freev(), parse(), parseqatom(), and rfree().

{
    if (sr == NULL)
        return;

    if (sr->left != NULL)
        freesubre(v, sr->left);
    if (sr->right != NULL)
        freesubre(v, sr->right);

    freesrnode(v, sr);
}

freev()

static int freev ( struct vars *  v, int  err  )

static

Definition at line 531 of file regcomp.c.

References cleanst(), vars::cv, vars::cv2, vars::err, ERR, FREE, freecvec(), freelacons(), freenfa(), freesubre(), vars::lacons, vars::nfa, vars::nlacons, vars::re, rfree(), vars::sub10, vars::subs, vars::tree, and vars::treechain.

Referenced by pg_regcomp().

{
    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->lacons != NULL)
        freelacons(v->lacons, v->nlacons);
    ERR(err);                   /* nop if err==0 */

    return v->err;
}

getcvec()

static struct cvec* getcvec ( struct vars *  , int  , int    )

static

hasconstraintout()

static int hasconstraintout ( struct state *  )

static

hasnonemptyout()

static int hasnonemptyout ( struct state *  )

static

initcm()

static void initcm ( struct vars *  , struct colormap *    )

static

Referenced by pg_regcomp().

isconstraintarc()

static int isconstraintarc ( struct arc *  )

static

lexdigits()

static chr lexdigits ( struct vars *  , int  , int  , int    )

static

lexescape()

static int lexescape ( struct vars *  )

static

lexnest()

static void lexnest ( struct vars *  , const chr *  , const chr *    )

static

lexstart()

static void lexstart ( struct vars *  )

static

Referenced by pg_regcomp().

lexword()

static void lexword ( struct vars *  )

static

Referenced by wordchrs().

makesearch()

static void makesearch ( struct vars *  v, struct nfa *  nfa  )

static

Definition at line 560 of file regcomp.c.

References assert, nfa::bos, vars::cm, arc::co, COLORLESS, copyouts(), cparc(), freearc(), arc::from, arc::inchain, state::ins, newarc(), newstate(), NOERR, arc::outchain, state::outs, PLAIN, nfa::pre, rainbow(), s2, state::tmp, arc::to, and arc::type.

Referenced by nfanode(), and pg_regcomp().

{
    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 (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);
    }

    /*
     * 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.
     */

    /* first, make a list of the states reachable from pre and elsewhere */
    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;
        }

        /*
         * We want to mark states as being in the list already by having non
         * NULL tmp fields, but we can't just store the old slist value in tmp
         * because that doesn't work for the first such state.  Instead, the
         * first list entry gets its own address in tmp.
         */
        if (b != NULL && s->tmp == NULL)
        {
            s->tmp = (slist != NULL) ? slist : s;
            slist = s;
        }
    }

    /* do the splits */
    for (s = slist; s != NULL; s = s2)
    {
        s2 = newstate(nfa);
        NOERR();
        copyouts(nfa, s, s2);
        NOERR();
        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) ? s->tmp : NULL;
        s->tmp = NULL;          /* clean up while we're at it */
    }
}

markcanreach()

static void markcanreach ( struct nfa *  , struct state *  , struct state *  , struct state *    )

static

markreachable()

static void markreachable ( struct nfa *  , struct state *  , struct state *  , struct state *    )

static

markst()

static void markst ( struct subre *  t )

static

Definition at line 1831 of file regcomp.c.

References assert, subre::flags, INUSE, subre::left, and subre::right.

Referenced by pg_regcomp().

{
    assert(t != NULL);

    t->flags |= INUSE;
    if (t->left != NULL)
        markst(t->left);
    if (t->right != NULL)
        markst(t->right);
}

maxcolor()

static color maxcolor ( struct colormap *  )

static

mergeins()

static void mergeins ( struct nfa *  , struct state *  , struct arc **  , int    )

static

moresubs()

static void moresubs ( struct vars *  v, int  wanted  )

static

Definition at line 494 of file regcomp.c.

References assert, ERR, MALLOC, vars::nsubs, REALLOC, REG_ESPACE, vars::sub10, vars::subs, and VS.

Referenced by parseqatom().

{
    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 *));
    }
    else
        p = (struct subre **) REALLOC(v->subs, n * sizeof(struct subre *));
    if (p == NULL)
    {
        ERR(REG_ESPACE);
        return;
    }
    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);
}

moveins()

static void moveins ( struct nfa *  , struct state *  , struct state *    )

static

Referenced by parsebranch(), parseqatom(), and repeat().

moveouts()

static void moveouts ( struct nfa *  , struct state *  , struct state *    )

static

Referenced by parseqatom(), and repeat().

newarc()

static void newarc ( struct nfa *  , int  , color  , struct state *  , struct state *    )

static

Referenced by cbracket(), makesearch(), nonword(), and processlacon().

newcolor()

static color newcolor ( struct colormap *  )

static

newcvec()

static struct cvec* newcvec ( int  , int    )

static

Referenced by pg_regcomp().

newfstate()

static struct state* newfstate ( struct nfa *  , int  flag  )

static

newhicolorcols()

static void newhicolorcols ( struct colormap *  )

static

newhicolorrow()

static int newhicolorrow ( struct colormap *  , int    )

static

newlacon()

static int newlacon ( struct vars *  v, struct state *  begin, struct state *  end, int  latype  )

static

Definition at line 1924 of file regcomp.c.

References subre::begin, subre::cnfa, subre::end, ERR, vars::lacons, MALLOC, vars::nlacons, REALLOC, REG_ESPACE, subre::subno, and ZAPCNFA.

Referenced by processlacon().

{
    int         n;
    struct subre *newlacons;
    struct subre *sub;

    if (v->nlacons == 0)
    {
        n = 1;                  /* skip 0th */
        newlacons = (struct subre *) MALLOC(2 * sizeof(struct subre));
    }
    else
    {
        n = v->nlacons;
        newlacons = (struct subre *) REALLOC(v->lacons,
                                             (n + 1) * sizeof(struct subre));
    }
    if (newlacons == NULL)
    {
        ERR(REG_ESPACE);
        return 0;
    }
    v->lacons = newlacons;
    v->nlacons = n + 1;
    sub = &v->lacons[n];
    sub->begin = begin;
    sub->end = end;
    sub->subno = latype;
    ZAPCNFA(sub->cnfa);
    return n;
}

newline()

static chr newline ( void  )

static

Referenced by pg_regcomp().

newnfa()

static struct nfa* newnfa ( struct vars *  , struct colormap *  , struct nfa *    )

static

Referenced by nfanode(), and pg_regcomp().

newstate()

static struct state* newstate ( struct nfa *  )

static

Referenced by cbracket(), makesearch(), parse(), parsebranch(), parseqatom(), repeat(), and wordchrs().

newsub()

static color newsub ( struct colormap *  , color    )

static

next()

static int next ( struct vars *  )

static

Referenced by cleanst().

nfanode()

static long nfanode ( struct vars *  v, struct subre *  t, int  converttosearch, FILE *  f  )

static

Definition at line 1885 of file regcomp.c.

References assert, subre::begin, vars::cm, subre::cnfa, compact(), dupnfa(), subre::end, nfa::final, freenfa(), nfa::init, ISERR, makesearch(), newnfa(), vars::nfa, NOERRZ, optimize(), and specialcolors().

Referenced by nfatree(), and pg_regcomp().

{
    struct nfa *nfa;
    long        ret = 0;

    assert(t->begin != NULL);

#ifdef REG_DEBUG
    if (f != NULL)
    {
        char        idbuf[50];

        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);
    if (!ISERR())
        ret = optimize(nfa, f);
    if (converttosearch && !ISERR())
        makesearch(v, nfa);
    if (!ISERR())
        compact(nfa, &t->cnfa);

    freenfa(nfa);
    return ret;
}

nfatree()

static long nfatree ( struct vars *  v, struct subre *  t, FILE *  f  )

static

Definition at line 1865 of file regcomp.c.

References assert, subre::begin, DISCARD, subre::left, nfanode(), and subre::right.

Referenced by pg_regcomp().

{
    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, 0, f);
}

nonword()

static void nonword ( struct vars *  v, int  dir, struct state *  lp, struct state *  rp  )

static

Definition at line 1226 of file regcomp.c.

References AHEAD, assert, BEHIND, vars::cm, colorcomplement(), newarc(), vars::nfa, and vars::wordchrs.

Referenced by parseqatom().

{
    int         anchor = (dir == AHEAD) ? '$' : '^';

    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) */
}

numst()

static int numst ( struct subre *  t, int  start  )

static

Definition at line 1797 of file regcomp.c.

References assert, i, subre::id, subre::left, subre::right, and vars::start.

Referenced by pg_regcomp().

{
    int         i;

    assert(t != NULL);

    i = start;
    t->id = (short) i++;
    if (t->left != NULL)
        i = numst(t->left, i);
    if (t->right != NULL)
        i = numst(t->right, i);
    return i;
}

okcolors()

static void okcolors ( struct nfa *  , struct colormap *    )

static

Referenced by bracket(), parseqatom(), and pg_regcomp().

onechr()

static void onechr ( struct vars *  v, chr  c, struct state *  lp, struct state *  rp  )

static

Definition at line 1562 of file regcomp.c.

References allcases(), vars::cflags, COLORLESS, REG_ICASE, subcolorcvec(), and subcoloronechr().

Referenced by brackpart(), and parseqatom().

{
    if (!(v->cflags & REG_ICASE))
    {
        color       lastsubcolor = COLORLESS;

        subcoloronechr(v, c, lp, rp, &lastsubcolor);
        return;
    }

    /* rats, need general case anyway... */
    subcolorcvec(v, allcases(v, c), lp, rp);
}

optimize()

static long optimize ( struct nfa *  , FILE *    )

static

Referenced by nfanode(), and pg_regcomp().

optst()

static void optst ( struct vars *  v, struct subre *  t  )

static

Definition at line 1781 of file regcomp.c.

Referenced by pg_regcomp().

{
    /*
     * DGP (2007-11-13): I assume it was the programmer's intent to eventually
     * come back and add code to optimize subRE trees, but the routine coded
     * just spends effort traversing the tree and doing nothing. We can do
     * nothing with less effort.
     */
    return;
}

parse()

static struct subre * parse ( struct vars *  v, int  stopper, int  type, struct state *  init, struct state *  final  )

static

Definition at line 649 of file regcomp.c.

References assert, EAT, EMPTYARC, EOS, ERR, subre::flags, freesubre(), subre::left, LONGER, MESSY, newstate(), vars::nfa, NOERRN, subre::op, parsebranch(), REG_EPAREN, subre::right, SEE, subre(), and UP.

Referenced by _outPlannerInfo(), add_foreign_grouping_paths(), add_paths_to_grouping_rel(), build_minmax_path(), can_partial_agg(), check_sql_fn_retval(), consider_groupingsets_paths(), convert_ANY_sublink_to_join(), convert_EXISTS_sublink_to_join(), create_degenerate_grouping_paths(), create_distinct_paths(), create_grouping_paths(), create_partial_grouping_paths(), expand_inherited_rtentry(), expand_single_inheritance_child(), flatten_simple_union_all(), get_number_of_groups(), grouping_planner(), inheritance_planner(), is_degenerate_grouping(), make_group_input_target(), make_partial_grouping_target(), make_sort_input_target(), make_window_input_target(), max_parallel_hazard(), parseqatom(), pg_regcomp(), plan_set_operations(), planner(), preprocess_groupclause(), preprocess_grouping_sets(), preprocess_limit(), preprocess_minmax_aggregates(), preprocess_rowmarks(), preprocess_targetlist(), pull_up_simple_subquery(), pull_up_simple_values(), query_planner(), remove_useless_groupby_columns(), resolve_unique_index_expr(), set_subquery_pathlist(), standard_qp_callback(), and subquery_planner().

{
    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);
    }

    /* 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 = '=';
    }

    return branches;
}

parsebranch()

static struct subre * parsebranch ( struct vars *  v, int  stopper, int  type, struct state *  left, struct state *  right, int  partial  )

static

Definition at line 728 of file regcomp.c.

References assert, EMPTYARC, EOS, subre::left, moveins(), newstate(), vars::nfa, NOERRN, NOTE, parseqatom(), REG_UUNSPEC, SEE, and subre().

Referenced by parse(), and parseqatom().

{
    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;

        /* NB, recursion in parseqatom() may swallow rest of branch */
        parseqatom(v, stopper, type, lp, right, t);
        NOERRN();
    }

    if (!seencontent)
    {                           /* empty branch */
        if (!partial)
            NOTE(REG_UUNSPEC);
        assert(lp == left);
        EMPTYARC(left, right);
    }

    return t;
}

parseqatom()

static void parseqatom ( struct vars *  v, int  stopper, int  type, struct state *  lp, struct state *  rp, struct subre *  top  )

static

Definition at line 777 of file regcomp.c.

References AHEAD, ARCV, assert, BACKR, BACKREF, subre::begin, BEHIND, bracket(), CAP, cbracket(), vars::cflags, vars::cm, COLORLESS, COMBINE, delsub(), DIGIT, DUPINF, dupnfa(), EAT, EMPTYARC, subre::end, EOS, ERR, subre::flags, freesubre(), INSIST, ISERR, LACON, subre::left, LONGER, subre::max, MESSY, subre::min, moresubs(), moveins(), moveouts(), newstate(), NEXT, vars::nexttype, vars::nextvalue, vars::nfa, state::nins, vars::nlcolor, NOERR, nonword(), NOTE, state::nouts, vars::nsubexp, vars::nsubs, NWBDRY, okcolors(), onechr(), subre::op, parse(), parsebranch(), PLAIN, PREF, processlacon(), rainbow(), REG_ADVANCED, REG_ASSERT, REG_BADBR, REG_BADRPT, REG_EPAREN, REG_ESUBREG, REG_EXTENDED, REG_NLANCH, REG_NLSTOP, REG_UPBOTCH, repeat(), subre::right, s2, SBEGIN, scannum(), SEE, SEND, SHORTER, subre::subno, subre(), vars::subs, UP, WBDRY, word(), and vars::wordchrs.

Referenced by parsebranch().

{
    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         latype;         /* lookaround constraint type */
    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 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:             /* lookaround constraint */
            latype = v->nextvalue;
            NEXT();
            s = newstate(v->nfa);
            s2 = newstate(v->nfa);
            NOERR();
            t = parse(v, ')', LACON, s, s2);
            freesubre(v, t);    /* internal structure irrelevant */
            NOERR();
            assert(SEE(')'));
            NEXT();
            processlacon(v, s, s2, latype, lp, rp);
            return;
            break;
            /* then errors, to get them out of the way */
        case '*':
        case '+':
        case '?':
        case '{':
            ERR(REG_BADRPT);
            return;
            break;
        default:
            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;
            }
            /* legal in EREs due to specification botch */
            NOTE(REG_UPBOTCH);
            /* fall through into case PLAIN */
            /* FALLTHROUGH */
        case PLAIN:
            onechr(v, v->nextvalue, lp, rp);
            okcolors(v->nfa, v->cm);
            NOERR();
            NEXT();
            break;
        case '[':
            if (v->nextvalue == 1)
                bracket(v, lp, rp);
            else
                cbracket(v, lp, rp);
            assert(SEE(']') || ISERR());
            NEXT();
            break;
        case '.':
            rainbow(v->nfa, v->cm, PLAIN,
                    (v->cflags & REG_NLSTOP) ? v->nlcolor : COLORLESS,
                    lp, rp);
            NEXT();
            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
                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, ')', type, 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);
            NOERR();
            subno = v->nextvalue;
            atom->subno = subno;
            EMPTYARC(lp, rp);   /* temporarily, so there's something */
            NEXT();
            break;
    }

    /* ...and an atom may be followed by a quantifier */
    switch (v->nexttype)
    {
        case '*':
            m = 0;
            n = DUPINF;
            qprefer = (v->nextvalue) ? LONGER : SHORTER;
            NEXT();
            break;
        case '+':
            m = 1;
            n = DUPINF;
            qprefer = (v->nextvalue) ? LONGER : SHORTER;
            NEXT();
            break;
        case '?':
            m = 0;
            n = 1;
            qprefer = (v->nextvalue) ? LONGER : SHORTER;
            NEXT();
            break;
        case '{':
            NEXT();
            m = scannum(v);
            if (EAT(','))
            {
                if (SEE(DIGIT))
                    n = scannum(v);
                else
                    n = DUPINF;
                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;
    }

    /* 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;
    }

    /* 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.
     */

    /* now we'll need a subre for the contents even if they're boring */
    if (atom == NULL)
    {
        atom = subre(v, '=', 0, lp, rp);
        NOERR();
    }

    /*----------
     * Prepare a general-purpose state skeleton.
     *
     * In the no-backrefs case, we want this:
     *
     * [lp] ---> [s] ---prefix---> [begin] ---atom---> [end] ---rest---> [rp]
     *
     * where prefix is some repetitions of atom.  In the general case we need
     *
     * [lp] ---> [s] ---iterator---> [s2] ---rest---> [rp]
     *
     * where the iterator wraps around [begin] ---atom---> [end]
     *
     * We make the s state here for both cases; s2 is made below if needed
     *----------
     */
    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);       /* set up starting state */
    NOERR();
    EMPTYARC(lp, s);
    NOERR();

    /* break remaining subRE into x{...} and what follows */
    t = subre(v, '.', COMBINE(qprefer, atom->flags), lp, rp);
    NOERR();
    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);
    NOERR();
    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.  If the atom is just a backref, we'll let it deal
     * with quantifiers internally.
     */
    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);
        /* rest of branch can be strung starting from atom->end */
        s2 = atom->end;
    }
    else if (m == 1 && n == 1)
    {
        /* no/vacuous quantifier:  done */
        EMPTYARC(s, atom->begin);   /* empty prefix */
        /* rest of branch can be strung starting from atom->end */
        s2 = atom->end;
    }
    else if (m > 0 && !(atom->flags & BACKR))
    {
        /*
         * If there's no backrefs involved, we can turn x{m,n} into
         * x{m-1,n-1}x, with capturing parens in only the second x.  This is
         * valid because we only care about capturing matches from the final
         * iteration of the quantifier.  It's a win because we can implement
         * the backref-free left side as a plain DFA node, since we don't
         * really care where its submatches are.
         */
        dupnfa(v->nfa, atom->begin, atom->end, s, atom->begin);
        assert(m >= 1 && m != DUPINF && n >= 1);
        repeat(v, s, atom->begin, m - 1, (n == DUPINF) ? 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;
        /* rest of branch can be strung starting from atom->end */
        s2 = atom->end;
    }
    else
    {
        /* general case: need an iteration node */
        s2 = newstate(v->nfa);
        NOERR();
        moveouts(v->nfa, atom->end, s2);
        NOERR();
        dupnfa(v->nfa, atom->begin, atom->end, s, s2);
        repeat(v, s, s2, m, n);
        f = COMBINE(qprefer, atom->flags);
        t = subre(v, '*', f, s, s2);
        NOERR();
        t->min = (short) m;
        t->max = (short) n;
        t->left = atom;
        *atomp = t;
        /* rest of branch is to be strung from iteration's end state */
    }

    /* and finally, look after that postponed recursion */
    t = top->right;
    if (!(SEE('|') || SEE(stopper) || SEE(EOS)))
        t->right = parsebranch(v, stopper, type, s2, rp, 1);
    else
    {
        EMPTYARC(s2, rp);
        t->right = subre(v, '=', 0, s2, rp);
    }
    NOERR();
    assert(SEE('|') || SEE(stopper) || SEE(EOS));
    t->flags |= COMBINE(t->flags, t->right->flags);
    top->flags |= COMBINE(top->flags, t->flags);
}

pg_regcomp()

int pg_regcomp	(	regex_t *	re,
		const chr *	string,
		size_t	len,
		int	flags,
		Oid	collation
	)

Definition at line 314 of file regcomp.c.

References assert, casecmp(), vars::cflags, guts::cflags, cleanst(), vars::cm, guts::cmap, cmp(), CNOERR, COLORLESS, compact(), vars::cv, vars::cv2, debug, DISCARD, dumpnfa(), EOS, vars::err, nfa::final, subre::flags, freev(), vars::g, GUTSMAGIC, i, guts::info, nfa::init, initcm(), vars::lacons, guts::lacons, LATYPE_IS_AHEAD, lexstart(), guts::magic, makesearch(), MALLOC, markst(), newcvec(), newline(), newnfa(), vars::nfa, nfanode(), nfatree(), vars::nlacons, guts::nlacons, vars::nlcolor, NOTE, vars::now, guts::nsub, vars::nsubexp, vars::nsubs, vars::ntree, guts::ntree, numst(), okcolors(), optimize(), optst(), parse(), pg_set_regex_collation(), PLAIN, vars::re, regex_t::re_collation, regex_t::re_csize, regex_t::re_fns, regex_t::re_guts, regex_t::re_info, regex_t::re_magic, regex_t::re_nsub, REG_ADVANCED, REG_ADVF, REG_DUMP, REG_ESPACE, REG_EXPANDED, REG_EXTENDED, REG_ICASE, REG_INVARG, REG_NEWLINE, REG_NLANCH, REG_NLSTOP, REG_PROGRESS, REG_QUOTE, REG_USHORTEST, REMAGIC, vars::savenow, vars::savestop, guts::search, SEE, SHORTER, vars::spaceused, specialcolors(), vars::stop, vars::sub10, subcolor(), subre::subno, vars::subs, vars::tree, guts::tree, vars::treechain, vars::treefree, VS, vars::wordchrs, and ZAPCNFA.

Referenced by NIAddAffix(), parse_ident_line(), RE_compile(), and RE_compile_and_cache().

{
    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;

    /* Initialize locale-dependent support */
    pg_set_regex_collation(collation);

    /* initial setup (after which freev() is callable) */
    v->re = re;
    v->now = 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->lacons = NULL;
    v->nlacons = 0;
    v->spaceused = 0;
    re->re_magic = REMAGIC;
    re->re_info = 0;            /* bits get set during parse */
    re->re_csize = sizeof(chr);
    re->re_collation = collation;
    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();
    /* set up a reasonably-sized transient cvec for getcvec usage */
    v->cv = newcvec(100, 20);
    if (v->cv == NULL)
        return freev(v, REG_ESPACE);

    /* 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);
    }
#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

    /* 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++)
    {
        struct subre *lasub = &v->lacons[i];

#ifdef REG_DEBUG
        if (debug != NULL)
            fprintf(debug, "\n\n\n========= LA%d ==========\n", i);
#endif

        /* Prepend .* to pattern if it's a lookbehind LACON */
        nfanode(v, lasub, !LATYPE_IS_AHEAD(lasub->subno), 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(v->err == 0);
    return freev(v, 0);
}

pg_wc_isalnum()

static int pg_wc_isalnum ( pg_wchar  c )

static

pg_wc_isalpha()

static int pg_wc_isalpha ( pg_wchar  c )

static

pg_wc_isdigit()

static int pg_wc_isdigit ( pg_wchar  c )

static

pg_wc_isgraph()

static int pg_wc_isgraph ( pg_wchar  c )

static

pg_wc_islower()

static int pg_wc_islower ( pg_wchar  c )

static

pg_wc_isprint()

static int pg_wc_isprint ( pg_wchar  c )

static

pg_wc_ispunct()

static int pg_wc_ispunct ( pg_wchar  c )

static

pg_wc_isspace()

static int pg_wc_isspace ( pg_wchar  c )

static

pg_wc_isupper()

static int pg_wc_isupper ( pg_wchar  c )

static

pg_wc_tolower()

static pg_wchar pg_wc_tolower ( pg_wchar  c )

static

pg_wc_toupper()

static pg_wchar pg_wc_toupper ( pg_wchar  c )

static

prefixes()

static void prefixes ( struct vars *  )

static

processlacon()

static void processlacon ( struct vars *  v, struct state *  begin, struct state *  end, int  latype, struct state *  lp, struct state *  rp  )

static

Definition at line 1621 of file regcomp.c.

References AHEAD, assert, BEHIND, cloneouts(), vars::cm, colorcomplement(), LACON, LATYPE_AHEAD_NEG, LATYPE_AHEAD_POS, LATYPE_BEHIND_NEG, LATYPE_BEHIND_POS, newarc(), newlacon(), vars::nfa, NOTREACHED, s1, and single_color_transition().

Referenced by parseqatom().

{
    struct state *s1;
    int         n;

    /*
     * Check for lookaround RE consisting of a single plain color arc (or set
     * of arcs); this would typically be a simple chr or a bracket expression.
     */
    s1 = single_color_transition(begin, end);
    switch (latype)
    {
        case LATYPE_AHEAD_POS:
            /* If lookahead RE is just colorset C, convert to AHEAD(C) */
            if (s1 != NULL)
            {
                cloneouts(v->nfa, s1, lp, rp, AHEAD);
                return;
            }
            break;
        case LATYPE_AHEAD_NEG:
            /* If lookahead RE is just colorset C, convert to AHEAD(^C)|$ */
            if (s1 != NULL)
            {
                colorcomplement(v->nfa, v->cm, AHEAD, s1, lp, rp);
                newarc(v->nfa, '$', 1, lp, rp);
                newarc(v->nfa, '$', 0, lp, rp);
                return;
            }
            break;
        case LATYPE_BEHIND_POS:
            /* If lookbehind RE is just colorset C, convert to BEHIND(C) */
            if (s1 != NULL)
            {
                cloneouts(v->nfa, s1, lp, rp, BEHIND);
                return;
            }
            break;
        case LATYPE_BEHIND_NEG:
            /* If lookbehind RE is just colorset C, convert to BEHIND(^C)|^ */
            if (s1 != NULL)
            {
                colorcomplement(v->nfa, v->cm, BEHIND, s1, lp, rp);
                newarc(v->nfa, '^', 1, lp, rp);
                newarc(v->nfa, '^', 0, lp, rp);
                return;
            }
            break;
        default:
            assert(NOTREACHED);
    }

    /* General case: we need a LACON subre and arc */
    n = newlacon(v, begin, end, latype);
    newarc(v->nfa, LACON, n, lp, rp);
}

pseudocolor()

static color pseudocolor ( struct colormap *  )

static

pull()

static int pull ( struct nfa *  , struct arc *  , struct state **    )

static

pullback()

static void pullback ( struct nfa *  , FILE *    )

static

push()

static int push ( struct nfa *  , struct arc *  , struct state **    )

static

pushfwd()

static void pushfwd ( struct nfa *  , FILE *    )

static

rainbow()

static void rainbow ( struct nfa *  , struct colormap *  , int  , color  , struct state *  , struct state *    )

static

Referenced by makesearch(), and parseqatom().

range()

static struct cvec* range ( struct vars *  , chr  , chr  , int    )

static

Referenced by brackpart().

rcancelrequested()

static int rcancelrequested ( void  )

static

Definition at line 2016 of file regcomp.c.

References InterruptPending, ProcDiePending, and QueryCancelPending.

{
    return InterruptPending && (QueryCancelPending || ProcDiePending);
}

repeat()

static void repeat ( struct vars *  v, struct state *  lp, struct state *  rp, int  m, int  n  )

static

Definition at line 1289 of file regcomp.c.

References delsub(), dupnfa(), EMPTYARC, ERR, INF, moveins(), moveouts(), newstate(), vars::nfa, NOERR, PAIR, REDUCE, REG_ASSERT, s2, and SOME.

Referenced by parseqatom().

{
#define  SOME    2
#define  INF     3
#define  PAIR(x, y)  ((x)*4 + (y))
#define  REDUCE(x)   ( ((x) == DUPINF) ? 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;
    }
}

rfree()

static void rfree ( regex_t *  re )

static

Definition at line 1980 of file regcomp.c.

References guts::cmap, FREE, freecm(), freecnfa(), freelacons(), freesubre(), vars::g, guts::lacons, guts::magic, guts::nlacons, NULLCNFA, regex_t::re_fns, regex_t::re_guts, regex_t::re_magic, REMAGIC, guts::search, and guts::tree.

Referenced by freev().

{
    struct guts *g;

    if (re == NULL || re->re_magic != REMAGIC)
        return;

    re->re_magic = 0;           /* invalidate RE */
    g = (struct guts *) re->re_guts;
    re->re_guts = NULL;
    re->re_fns = NULL;
    if (g != 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);
    }
}

rstacktoodeep()

static int rstacktoodeep ( void  )

static

Definition at line 2032 of file regcomp.c.

References BACKR, subre::begin, buf, CAP, guts::cmap, subre::cnfa, DUPINF, subre::end, subre::flags, vars::g, GUTSMAGIC, i, subre::id, INUSE, guts::lacons, LATYPE_AHEAD_NEG, LATYPE_AHEAD_POS, LATYPE_BEHIND_NEG, LATYPE_BEHIND_POS, subre::left, LONGER, guts::magic, subre::max, subre::min, MIXED, guts::nlacons, state::no, guts::ntree, NULLCNFA, subre::op, vars::re, regex_t::re_csize, regex_t::re_guts, regex_t::re_info, regex_t::re_magic, regex_t::re_nsub, REMAGIC, subre::right, guts::search, SHORTER, stack_is_too_deep(), subre::subno, and guts::tree.

{
    return stack_is_too_deep();
}

scannum()

static int scannum ( struct vars *  v )

static

Definition at line 1258 of file regcomp.c.

References DIGIT, DUPMAX, ERR, NEXT, vars::nextvalue, REG_BADBR, and SEE.

Referenced by parseqatom().

{
    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;
}

scanplain()

static const chr * scanplain ( struct vars *  v )

static

Definition at line 1537 of file regcomp.c.

References assert, CCLASS, COLLEL, ECLASS, END, ISERR, NEXT, vars::now, PLAIN, and SEE.

Referenced by brackpart().

{
    const 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;
}

single_color_transition()

static struct state* single_color_transition ( struct state *  , struct state *    )

static

Referenced by processlacon().

skip()

static void skip ( struct vars *  )

static

sortins()

static void sortins ( struct nfa *  , struct state *    )

static

sortins_cmp()

static int sortins_cmp ( const void *  , const void *    )

static

sortouts()

static void sortouts ( struct nfa *  , struct state *    )

static

sortouts_cmp()

static int sortouts_cmp ( const void *  , const void *    )

static

specialcolors()

static void specialcolors ( struct nfa *  )

static

Referenced by nfanode(), and pg_regcomp().

subcolor()

static color subcolor ( struct colormap *  , chr    )

static

Referenced by pg_regcomp().

subcolorcvec()

static void subcolorcvec ( struct vars *  , struct cvec *  , struct state *  , struct state *    )

static

Referenced by brackpart(), and onechr().

subcolorhi()

static color subcolorhi ( struct colormap *  , color *    )

static

subcoloronechr()

static void subcoloronechr ( struct vars *  , chr  , struct state *  , struct state *  , color *    )

static

Referenced by onechr().

subcoloronerange()

static void subcoloronerange ( struct vars *  , chr  , chr  , struct state *  , struct state *  , color *    )

static

subcoloronerow()

static void subcoloronerow ( struct vars *  , int  , struct state *  , struct state *  , color *    )

static

subre()

static struct subre * subre ( struct vars *  v, int  op, int  flags, struct state *  begin, struct state *  end  )

static

Definition at line 1687 of file regcomp.c.

References assert, subre::begin, subre::chain, subre::cnfa, subre::end, ERR, subre::flags, subre::id, subre::left, MALLOC, subre::max, subre::min, subre::op, vars::re, REG_ESPACE, REG_ETOOBIG, subre::right, STACK_TOO_DEEP, subre::subno, vars::treechain, vars::treefree, and ZAPCNFA.

Referenced by parse(), parsebranch(), and parseqatom().

{
    struct subre *ret = v->treefree;

    /*
     * Checking for stack overflow here is sufficient to protect parse() and
     * its recursive subroutines.
     */
    if (STACK_TOO_DEEP(v->re))
    {
        ERR(REG_ETOOBIG);
        return NULL;
    }

    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;
    }

    assert(strchr("=b|.*(", op) != NULL);

    ret->op = op;
    ret->flags = flags;
    ret->id = 0;                /* will be assigned later */
    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;
}

uncolorchain()

static void uncolorchain ( struct colormap *  , struct arc *    )

static

word()

static void word ( struct vars *  v, int  dir, struct state *  lp, struct state *  rp  )

static

Definition at line 1244 of file regcomp.c.

References AHEAD, assert, BEHIND, cloneouts(), vars::nfa, and vars::wordchrs.

Referenced by addNorm(), AddStem(), CheckCompoundAffixes(), cmpspell(), compareWORD(), dxsyn_lexize(), hlfinditem(), itsabbr(), parseqatom(), ScanKeywordLookup(), and unicode_to_utf8word().

{
    assert(dir == AHEAD || dir == BEHIND);
    cloneouts(v->nfa, v->wordchrs, lp, rp, dir);
    /* (no need for special attention to \n) */
}

wordchrs()

static void wordchrs ( struct vars *  v )

static

Definition at line 1589 of file regcomp.c.

References assert, bracket(), ISERR, lexword(), newstate(), NEXT, vars::nfa, NOERR, vars::savenow, SEE, and vars::wordchrs.

{
    struct state *left;
    struct state *right;

    if (v->wordchrs != NULL)
    {
        NEXT();                 /* for consistency */
        return;
    }

    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;
}

Variable Documentation

functions

const struct fns functions

static

Initial value:

= {
    rfree,                      
    rcancelrequested,           
    rstacktoodeep               
}

Definition at line 299 of file regcomp.c.

Referenced by _copyFunctionScan(), _copyRangeFunction(), _copyRangeTblEntry(), _equalRangeFunction(), _equalRangeTblEntry(), _outFunctionScan(), _outRangeFunction(), _outRangeTblEntry(), _readFunctionScan(), _readRangeTblEntry(), create_functionscan_plan(), ExplainNode(), and make_functionscan().