* blame Henry for some of the lack of readability.
*/
+/* The names of the functions have been changed from regcomp and
+ * regexec to pregcomp and pregexec in order to avoid conflicts
+ * with the POSIX routines of the same names.
+*/
+
/*SUPPRESS 112*/
/*
- * regcomp and regexec -- regsub and regerror are not used in perl
+ * pregcomp and pregexec -- regsub and regerror are not used in perl
*
* Copyright (c) 1986 by University of Toronto.
* Written by Henry Spencer. Not derived from licensed software.
*
**** Alterations to Henry's code are...
****
- **** Copyright (c) 1991-1994, Larry Wall
+ **** Copyright (c) 1991-1997, Larry Wall
****
**** You may distribute under the terms of either the GNU General Public
**** License or the Artistic License, as specified in the README file.
#include "perl.h"
#include "regcomp.h"
+#define RF_tainted 1 /* tainted information used? */
+#define RF_warned 2 /* warned about big count? */
+#define RF_evaled 4 /* Did an EVAL with setting? */
+
+#define RS_init 1 /* eval environment created */
+#define RS_set 2 /* replsv value is set */
+
#ifndef STATIC
#define STATIC static
#endif
-#ifdef DEBUGGING
-static I32 regnarrate = 0;
-static char* regprogram = 0;
-#endif
+#ifndef PERL_OBJECT
+typedef I32 CHECKPOINT;
-/* Current curly descriptor */
-typedef struct curcur CURCUR;
-struct curcur {
- int parenfloor; /* how far back to strip paren data */
- int cur; /* how many instances of scan we've matched */
- int min; /* the minimal number of scans to match */
- int max; /* the maximal number of scans to match */
- int minmod; /* whether to work our way up or down */
- char * scan; /* the thing to match */
- char * next; /* what has to match after it */
- char * lastloc; /* where we started matching this scan */
- CURCUR * oldcc; /* current curly before we started this one */
-};
-
-static CURCUR* regcc;
+/*
+ * Forwards.
+ */
-typedef I32 CHECKPOINT;
+static I32 regmatch _((regnode *prog));
+static I32 regrepeat _((regnode *p, I32 max));
+static I32 regrepeat_hard _((regnode *p, I32 max, I32 *lp));
+static I32 regtry _((regexp *prog, char *startpos));
-CHECKPOINT regcppush _((I32 parenfloor));
-char * regcppop _((void));
+static bool reginclass _((char *p, I32 c));
+static CHECKPOINT regcppush _((I32 parenfloor));
+static char * regcppop _((void));
+#endif
+#define REGINCLASS(p,c) (*(p) ? reginclass(p,c) : ANYOF_TEST(p,c))
-CHECKPOINT
-regcppush(parenfloor)
-I32 parenfloor;
+STATIC CHECKPOINT
+regcppush(I32 parenfloor)
{
+ dTHR;
int retval = savestack_ix;
- int i = (regsize - parenfloor) * 3;
+ int i = (regsize - parenfloor) * 4;
int p;
SSCHECK(i + 5);
for (p = regsize; p > parenfloor; p--) {
SSPUSHPTR(regendp[p]);
SSPUSHPTR(regstartp[p]);
+ SSPUSHPTR(reg_start_tmp[p]);
SSPUSHINT(p);
}
SSPUSHINT(regsize);
return retval;
}
-char*
-regcppop()
+/* These are needed since we do not localize EVAL nodes: */
+# define REGCP_SET DEBUG_r(PerlIO_printf(Perl_debug_log, " Setting an EVAL scope, savestack=%i\n", savestack_ix)); lastcp = savestack_ix
+# define REGCP_UNWIND DEBUG_r(lastcp != savestack_ix ? PerlIO_printf(Perl_debug_log," Clearing an EVAL scope, savestack=%i..%i\n", lastcp, savestack_ix) : 0); regcpblow(lastcp)
+
+STATIC char *
+regcppop(void)
{
+ dTHR;
I32 i = SSPOPINT;
U32 paren = 0;
char *input;
input = (char *) SSPOPPTR;
*reglastparen = SSPOPINT;
regsize = SSPOPINT;
- for (i -= 3; i > 0; i -= 3) {
+ for (i -= 3; i > 0; i -= 4) {
paren = (U32)SSPOPINT;
+ reg_start_tmp[paren] = (char *) SSPOPPTR;
regstartp[paren] = (char *) SSPOPPTR;
tmps = (char*)SSPOPPTR;
if (paren <= *reglastparen)
regendp[paren] = tmps;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, " restoring \\%d to %d(%d)..%d%s\n",
+ paren, regstartp[paren] - regbol,
+ reg_start_tmp[paren] - regbol,
+ regendp[paren] - regbol,
+ (paren > *reglastparen ? "(no)" : ""));
+ );
}
+ DEBUG_r(
+ if (*reglastparen + 1 <= regnpar) {
+ PerlIO_printf(Perl_debug_log, " restoring \\%d..\\%d to undef\n",
+ *reglastparen + 1, regnpar);
+ }
+ );
for (paren = *reglastparen + 1; paren <= regnpar; paren++) {
if (paren > regsize)
regstartp[paren] = Nullch;
return input;
}
-#define regcpblow(cp) leave_scope(cp)
+#define regcpblow(cp) LEAVE_SCOPE(cp)
/*
- * regexec and friends
+ * pregexec and friends
*/
/*
- * Forwards.
+ - pregexec - match a regexp against a string
*/
-
-static I32 regmatch _((char *prog));
-static I32 regrepeat _((char *p, I32 max));
-static I32 regtry _((regexp *prog, char *startpos));
-
+I32
+pregexec(register regexp *prog, char *stringarg, register char *strend, char *strbeg, I32 minend, SV *screamer, U32 nosave)
+/* strend: pointer to null at end of string */
+/* strbeg: real beginning of string */
+/* minend: end of match must be >=minend after stringarg. */
+/* nosave: For optimizations. */
+{
+ return
+ regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL,
+ nosave ? 0 : REXEC_COPY_STR);
+}
+
/*
- - regexec - match a regexp against a string
+ - regexec_flags - match a regexp against a string
*/
I32
-regexec(prog, stringarg, strend, strbeg, minend, screamer, safebase)
-register regexp *prog;
-char *stringarg;
-register char *strend; /* pointer to null at end of string */
-char *strbeg; /* real beginning of string */
-I32 minend; /* end of match must be at least minend after stringarg */
-SV *screamer;
-I32 safebase; /* no need to remember string in subbase */
+regexec_flags(register regexp *prog, char *stringarg, register char *strend, char *strbeg, I32 minend, SV *screamer, void *data, U32 flags)
+/* strend: pointer to null at end of string */
+/* strbeg: real beginning of string */
+/* minend: end of match must be >=minend after stringarg. */
+/* data: May be used for some additional optimizations. */
+/* nosave: For optimizations. */
{
register char *s;
- register I32 i;
- register char *c;
+ register regnode *c;
register char *startpos = stringarg;
register I32 tmp;
- I32 minlen = 0; /* must match at least this many chars */
+ I32 minlen; /* must match at least this many chars */
I32 dontbother = 0; /* how many characters not to try at end */
CURCUR cc;
+ I32 start_shift = 0; /* Offset of the start to find
+ constant substr. */
+ I32 end_shift = 0; /* Same for the end. */
+ I32 scream_pos = -1; /* Internal iterator of scream. */
+ char *scream_olds;
+ SV* oreplsv = GvSV(replgv);
cc.cur = 0;
+ cc.oldcc = 0;
regcc = &cc;
+ regprecomp = prog->precomp; /* Needed for error messages. */
#ifdef DEBUGGING
regnarrate = debug & 512;
regprogram = prog->program;
return 0;
}
+ minlen = prog->minlen;
+ if (strend - startpos < minlen) goto phooey;
+
if (startpos == strbeg) /* is ^ valid at stringarg? */
regprev = '\n';
else {
if (!multiline && regprev == '\n')
regprev = '\0'; /* force ^ to NOT match */
}
- regprecomp = prog->precomp;
- regnpar = prog->nparens;
+
/* Check validity of program. */
if (UCHARAT(prog->program) != MAGIC) {
FAIL("corrupted regexp program");
}
- if (prog->do_folding) {
- i = strend - startpos;
- New(1101,c,i+1,char);
- Copy(startpos, c, i+1, char);
- startpos = c;
- strend = startpos + i;
- for (s = startpos; s < strend; s++)
- if (isUPPER(*s))
- *s = toLOWER(*s);
- }
+ regnpar = prog->nparens;
+ reg_flags = 0;
+ reg_eval_set = 0;
/* If there is a "must appear" string, look for it. */
s = startpos;
- if (prog->regmust != Nullsv &&
- (!(prog->reganch & ROPT_ANCH)
- || (multiline && prog->regback >= 0)) )
+ if (!(flags & REXEC_CHECKED)
+ && prog->check_substr != Nullsv &&
+ !(prog->reganch & ROPT_ANCH_GPOS) &&
+ (!(prog->reganch & (ROPT_ANCH_BOL | ROPT_ANCH_MBOL))
+ || (multiline && prog->check_substr == prog->anchored_substr)) )
{
- if (stringarg == strbeg && screamer) {
- if (screamfirst[BmRARE(prog->regmust)] >= 0)
- s = screaminstr(screamer,prog->regmust);
+ start_shift = prog->check_offset_min;
+ /* Should be nonnegative! */
+ end_shift = minlen - start_shift - SvCUR(prog->check_substr);
+ if (screamer) {
+ if (screamfirst[BmRARE(prog->check_substr)] >= 0)
+ s = screaminstr(screamer, prog->check_substr,
+ start_shift + (stringarg - strbeg),
+ end_shift, &scream_pos, 0);
else
s = Nullch;
+ scream_olds = s;
}
else
- s = fbm_instr((unsigned char*)s, (unsigned char*)strend,
- prog->regmust);
+ s = fbm_instr((unsigned char*)s + start_shift,
+ (unsigned char*)strend - end_shift,
+ prog->check_substr, 0);
if (!s) {
- ++BmUSEFUL(prog->regmust); /* hooray */
+ ++BmUSEFUL(prog->check_substr); /* hooray */
goto phooey; /* not present */
- }
- else if (prog->regback >= 0) {
- s -= prog->regback;
- if (s < startpos)
- s = startpos;
- minlen = prog->regback + SvCUR(prog->regmust);
- }
- else if (!prog->naughty && --BmUSEFUL(prog->regmust) < 0) { /* boo */
- SvREFCNT_dec(prog->regmust);
- prog->regmust = Nullsv; /* disable regmust */
- s = startpos;
- }
- else {
+ } else if ((s - stringarg) > prog->check_offset_max) {
+ ++BmUSEFUL(prog->check_substr); /* hooray/2 */
+ s -= prog->check_offset_max;
+ } else if (!prog->naughty
+ && --BmUSEFUL(prog->check_substr) < 0
+ && prog->check_substr == prog->float_substr) { /* boo */
+ SvREFCNT_dec(prog->check_substr);
+ prog->check_substr = Nullsv; /* disable */
+ prog->float_substr = Nullsv; /* clear */
s = startpos;
- minlen = SvCUR(prog->regmust);
- }
+ } else s = startpos;
}
- /* Mark beginning of line for ^ . */
+ /* Mark beginning of line for ^ and lookbehind. */
regbol = startpos;
+ bostr = strbeg;
/* Mark end of line for $ (and such) */
regeol = strend;
/* see how far we have to get to not match where we matched before */
regtill = startpos+minend;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log,
+ "Matching `%.60s%s' against `%.*s%s'\n",
+ prog->precomp,
+ (strlen(prog->precomp) > 60 ? "..." : ""),
+ (strend - startpos > 60 ? 60 : strend - startpos),
+ startpos,
+ (strend - startpos > 60 ? "..." : ""))
+ );
+
/* Simplest case: anchored match need be tried only once. */
- /* [unless multiline is set] */
+ /* [unless only anchor is BOL and multiline is set] */
if (prog->reganch & ROPT_ANCH) {
if (regtry(prog, startpos))
goto got_it;
- else if (multiline || (prog->reganch & ROPT_IMPLICIT)) {
+ else if (!(prog->reganch & ROPT_ANCH_GPOS) &&
+ (multiline || (prog->reganch & ROPT_IMPLICIT)
+ || (prog->reganch & ROPT_ANCH_MBOL)))
+ {
if (minlen)
dontbother = minlen - 1;
strend -= dontbother;
}
/* Messy cases: unanchored match. */
- if (prog->regstart) {
- if (prog->reganch & ROPT_SKIP) { /* we have /x+whatever/ */
- /* it must be a one character string */
- i = SvPVX(prog->regstart)[0];
- while (s < strend) {
- if (*s == i) {
- if (regtry(prog, s))
- goto got_it;
- s++;
- while (s < strend && *s == i)
- s++;
- }
+ if (prog->anchored_substr && prog->reganch & ROPT_SKIP) {
+ /* we have /x+whatever/ */
+ /* it must be a one character string */
+ char ch = SvPVX(prog->anchored_substr)[0];
+ while (s < strend) {
+ if (*s == ch) {
+ if (regtry(prog, s)) goto got_it;
s++;
+ while (s < strend && *s == ch)
+ s++;
}
+ s++;
}
- else if (SvPOK(prog->regstart) == 3) {
- /* We know what string it must start with. */
- while ((s = fbm_instr((unsigned char*)s,
- (unsigned char*)strend, prog->regstart)) != NULL)
- {
- if (regtry(prog, s))
- goto got_it;
- s++;
+ }
+ /*SUPPRESS 560*/
+ else if (prog->anchored_substr != Nullsv
+ || (prog->float_substr != Nullsv
+ && prog->float_max_offset < strend - s)) {
+ SV *must = prog->anchored_substr
+ ? prog->anchored_substr : prog->float_substr;
+ I32 back_max =
+ prog->anchored_substr ? prog->anchored_offset : prog->float_max_offset;
+ I32 back_min =
+ prog->anchored_substr ? prog->anchored_offset : prog->float_min_offset;
+ I32 delta = back_max - back_min;
+ char *last = strend - SvCUR(must) - back_min; /* Cannot start after this */
+ char *last1 = s - 1; /* Last position checked before */
+
+ /* XXXX check_substr already used to find `s', can optimize if
+ check_substr==must. */
+ scream_pos = -1;
+ dontbother = end_shift;
+ strend -= dontbother;
+ while ( (s <= last) &&
+ (screamer
+ ? (s = screaminstr(screamer, must, s + back_min - strbeg,
+ end_shift, &scream_pos, 0))
+ : (s = fbm_instr((unsigned char*)s + back_min,
+ (unsigned char*)strend, must, 0))) ) {
+ if (s - back_max > last1) {
+ last1 = s - back_min;
+ s = s - back_max;
+ } else {
+ char *t = last1 + 1;
+
+ last1 = s - back_min;
+ s = t;
}
- }
- else {
- c = SvPVX(prog->regstart);
- while ((s = ninstr(s, strend, c, c + SvCUR(prog->regstart))) != NULL)
- {
+ while (s <= last1) {
if (regtry(prog, s))
goto got_it;
s++;
}
}
goto phooey;
- }
- /*SUPPRESS 560*/
- if (c = prog->regstclass) {
+ } else if (c = prog->regstclass) {
I32 doevery = (prog->reganch & ROPT_SKIP) == 0;
+ char *Class;
if (minlen)
dontbother = minlen - 1;
/* We know what class it must start with. */
switch (OP(c)) {
case ANYOF:
- c = OPERAND(c);
+ Class = (char *) OPERAND(c);
while (s < strend) {
- i = UCHARAT(s);
- if (!(c[i >> 3] & (1 << (i&7)))) {
+ if (REGINCLASS(Class, *s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
s++;
}
break;
+ case BOUNDL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case BOUND:
if (minlen)
dontbother++,strend--;
- if (s != startpos) {
- i = s[-1];
- tmp = isALNUM(i);
- }
- else
- tmp = isALNUM(regprev); /* assume not alphanumeric */
+ tmp = (s != startpos) ? UCHARAT(s - 1) : regprev;
+ tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
while (s < strend) {
- i = *s;
- if (tmp != isALNUM(i)) {
+ if (tmp == !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) {
tmp = !tmp;
if (regtry(prog, s))
goto got_it;
if ((minlen || tmp) && regtry(prog,s))
goto got_it;
break;
+ case NBOUNDL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case NBOUND:
if (minlen)
dontbother++,strend--;
- if (s != startpos) {
- i = s[-1];
- tmp = isALNUM(i);
- }
- else
- tmp = isALNUM(regprev); /* assume not alphanumeric */
+ tmp = (s != startpos) ? UCHARAT(s - 1) : regprev;
+ tmp = ((OP(c) == NBOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
while (s < strend) {
- i = *s;
- if (tmp != isALNUM(i))
+ if (tmp == !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s)))
tmp = !tmp;
else if (regtry(prog, s))
goto got_it;
break;
case ALNUM:
while (s < strend) {
- i = *s;
- if (isALNUM(i)) {
+ if (isALNUM(*s)) {
+ if (tmp && regtry(prog, s))
+ goto got_it;
+ else
+ tmp = doevery;
+ }
+ else
+ tmp = 1;
+ s++;
+ }
+ break;
+ case ALNUML:
+ reg_flags |= RF_tainted;
+ while (s < strend) {
+ if (isALNUM_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
break;
case NALNUM:
while (s < strend) {
- i = *s;
- if (!isALNUM(i)) {
+ if (!isALNUM(*s)) {
+ if (tmp && regtry(prog, s))
+ goto got_it;
+ else
+ tmp = doevery;
+ }
+ else
+ tmp = 1;
+ s++;
+ }
+ break;
+ case NALNUML:
+ reg_flags |= RF_tainted;
+ while (s < strend) {
+ if (!isALNUM_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
s++;
}
break;
+ case SPACEL:
+ reg_flags |= RF_tainted;
+ while (s < strend) {
+ if (isSPACE_LC(*s)) {
+ if (tmp && regtry(prog, s))
+ goto got_it;
+ else
+ tmp = doevery;
+ }
+ else
+ tmp = 1;
+ s++;
+ }
+ break;
case NSPACE:
while (s < strend) {
if (!isSPACE(*s)) {
s++;
}
break;
+ case NSPACEL:
+ reg_flags |= RF_tainted;
+ while (s < strend) {
+ if (!isSPACE_LC(*s)) {
+ if (tmp && regtry(prog, s))
+ goto got_it;
+ else
+ tmp = doevery;
+ }
+ else
+ tmp = 1;
+ s++;
+ }
+ break;
case DIGIT:
while (s < strend) {
if (isDIGIT(*s)) {
}
}
else {
- if (minlen)
+ dontbother = 0;
+ if (prog->float_substr != Nullsv) { /* Trim the end. */
+ char *last;
+ I32 oldpos = scream_pos;
+
+ if (screamer) {
+ last = screaminstr(screamer, prog->float_substr, s - strbeg,
+ end_shift, &scream_pos, 1); /* last one */
+ if (!last) {
+ last = scream_olds; /* Only one occurence. */
+ }
+ } else {
+ STRLEN len;
+ char *little = SvPV(prog->float_substr, len);
+ last = rninstr(s, strend, little, little + len);
+ }
+ if (last == NULL) goto phooey; /* Should not happen! */
+ dontbother = strend - last - 1;
+ }
+ if (minlen && (dontbother < minlen))
dontbother = minlen - 1;
strend -= dontbother;
/* We don't know much -- general case. */
strend += dontbother; /* uncheat */
prog->subbeg = strbeg;
prog->subend = strend;
- if ((!safebase && (prog->nparens || sawampersand)) || prog->do_folding) {
- i = strend - startpos + (stringarg - strbeg);
- if (safebase) { /* no need for $digit later */
- s = strbeg;
- prog->subend = s+i;
- }
- else if (strbeg != prog->subbase) {
- s = savepvn(strbeg,i); /* so $digit will work later */
- if (prog->subbase)
+ RX_MATCH_TAINTED_set(prog, reg_flags & RF_tainted);
+
+ /* make sure $`, $&, $', and $digit will work later */
+ if (strbeg != prog->subbase) { /* second+ //g match. */
+ if (!(flags & REXEC_COPY_STR)) {
+ if (prog->subbase) {
Safefree(prog->subbase);
- prog->subbeg = prog->subbase = s;
- prog->subend = s+i;
+ prog->subbase = Nullch;
+ }
}
else {
- prog->subbeg = s = prog->subbase;
- prog->subend = s+i;
- }
- s += (stringarg - strbeg);
- for (i = 0; i <= prog->nparens; i++) {
- if (prog->endp[i]) {
- prog->startp[i] = s + (prog->startp[i] - startpos);
- prog->endp[i] = s + (prog->endp[i] - startpos);
+ I32 i = strend - startpos + (stringarg - strbeg);
+ s = savepvn(strbeg, i);
+ Safefree(prog->subbase);
+ prog->subbase = s;
+ prog->subbeg = prog->subbase;
+ prog->subend = prog->subbase + i;
+ s = prog->subbase + (stringarg - strbeg);
+ for (i = 0; i <= prog->nparens; i++) {
+ if (prog->endp[i]) {
+ prog->startp[i] = s + (prog->startp[i] - startpos);
+ prog->endp[i] = s + (prog->endp[i] - startpos);
+ }
}
}
- if (prog->do_folding)
- Safefree(startpos);
+ }
+ /* Preserve the current value of $^R */
+ if (oreplsv != GvSV(replgv)) {
+ sv_setsv(oreplsv, GvSV(replgv));/* So that when GvSV(replgv) is
+ restored, the value remains
+ the same. */
}
return 1;
phooey:
- if (prog->do_folding)
- Safefree(startpos);
return 0;
}
/*
- regtry - try match at specific point
*/
-static I32 /* 0 failure, 1 success */
-regtry(prog, startpos)
-regexp *prog;
-char *startpos;
+STATIC I32 /* 0 failure, 1 success */
+regtry(regexp *prog, char *startpos)
{
+ dTHR;
register I32 i;
register char **sp;
register char **ep;
+ CHECKPOINT lastcp;
+ if ((prog->reganch & ROPT_EVAL_SEEN) && !reg_eval_set) {
+ reg_eval_set = RS_init;
+ DEBUG_r(DEBUG_s(
+ PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %i\n", stack_sp - stack_base);
+ ));
+ SAVEINT(cxstack[cxstack_ix].blk_oldsp);
+ cxstack[cxstack_ix].blk_oldsp = stack_sp - stack_base;
+ /* Otherwise OP_NEXTSTATE will free whatever on stack now. */
+ SAVETMPS;
+ /* Apparently this is not needed, judging by wantarray. */
+ /* SAVEINT(cxstack[cxstack_ix].blk_gimme);
+ cxstack[cxstack_ix].blk_gimme = G_SCALAR; */
+ }
reginput = startpos;
regstartp = prog->startp;
regendp = prog->endp;
reglastparen = &prog->lastparen;
prog->lastparen = 0;
regsize = 0;
+ if (reg_start_tmpl <= prog->nparens) {
+ reg_start_tmpl = prog->nparens*3/2 + 3;
+ if(reg_start_tmp)
+ Renew(reg_start_tmp, reg_start_tmpl, char*);
+ else
+ New(22,reg_start_tmp, reg_start_tmpl, char*);
+ }
sp = prog->startp;
ep = prog->endp;
+ regdata = prog->data;
if (prog->nparens) {
for (i = prog->nparens; i >= 0; i--) {
*sp++ = NULL;
*ep++ = NULL;
}
}
- if (regmatch(prog->program + 1) && reginput >= regtill) {
+ REGCP_SET;
+ if (regmatch(prog->program + 1)) {
prog->startp[0] = startpos;
prog->endp[0] = reginput;
return 1;
}
- else
- return 0;
+ REGCP_UNWIND;
+ return 0;
}
/*
* maybe save a little bit of pushing and popping on the stack. It also takes
* advantage of machines that use a register save mask on subroutine entry.
*/
-static I32 /* 0 failure, 1 success */
-regmatch(prog)
-char *prog;
+STATIC I32 /* 0 failure, 1 success */
+regmatch(regnode *prog)
{
- register char *scan; /* Current node. */
- char *next; /* Next node. */
- register I32 nextchar;
+ dTHR;
+ register regnode *scan; /* Current node. */
+ regnode *next; /* Next node. */
+ regnode *inner; /* Next node in internal branch. */
+ register I32 nextchr; /* renamed nextchr - nextchar colides with function of same name */
register I32 n; /* no or next */
register I32 ln; /* len or last */
register char *s; /* operand or save */
register char *locinput = reginput;
- int minmod = 0;
+ register I32 c1, c2, paren; /* case fold search, parenth */
+ int minmod = 0, sw = 0, logical = 0;
+#ifdef DEBUGGING
+ regindent++;
+#endif
- nextchar = *locinput;
+ nextchr = UCHARAT(locinput);
scan = prog;
while (scan != NULL) {
+#define sayNO_L (logical ? (logical = 0, sw = 0, goto cont) : sayNO)
#ifdef DEBUGGING
- if (regnarrate)
- fprintf(stderr, "%2d%-8.8s\t<%.10s>\n",
- scan - regprogram, regprop(scan), locinput);
+# define sayYES goto yes
+# define sayNO goto no
+# define saySAME(x) if (x) goto yes; else goto no
+# define REPORT_CODE_OFF 24
+#else
+# define sayYES return 1
+# define sayNO return 0
+# define saySAME(x) return x
#endif
+ DEBUG_r( {
+ SV *prop = sv_newmortal();
+ int docolor = *colors[0];
+ int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
+ int l = (regeol - locinput > taill ? taill : regeol - locinput);
+ int pref_len = (locinput - bostr > (5 + taill) - l
+ ? (5 + taill) - l : locinput - bostr);
-#ifdef REGALIGN
- next = scan + NEXT(scan);
+ if (l + pref_len < (5 + taill) && l < regeol - locinput)
+ l = ( regeol - locinput > (5 + taill) - pref_len
+ ? (5 + taill) - pref_len : regeol - locinput);
+ regprop(prop, scan);
+ PerlIO_printf(Perl_debug_log,
+ "%4i <%s%.*s%s%s%s%.*s%s>%*s|%*s%2d%s\n",
+ locinput - bostr,
+ colors[2], pref_len, locinput - pref_len, colors[3],
+ (docolor ? "" : "> <"),
+ colors[0], l, locinput, colors[1],
+ 15 - l - pref_len + 1,
+ "",
+ regindent*2, "", scan - regprogram,
+ SvPVX(prop));
+ } );
+
+ next = scan + NEXT_OFF(scan);
if (next == scan)
next = NULL;
-#else
- next = regnext(scan);
-#endif
switch (OP(scan)) {
case BOL:
- if (locinput == regbol
+ if (locinput == bostr
? regprev == '\n'
- : ((nextchar || locinput < regeol) && locinput[-1] == '\n') )
+ : (multiline &&
+ (nextchr || locinput < regeol) && locinput[-1] == '\n') )
{
/* regtill = regbol; */
break;
}
- return 0;
+ sayNO;
case MBOL:
- if (locinput == regbol
+ if (locinput == bostr
? regprev == '\n'
- : ((nextchar || locinput < regeol) && locinput[-1] == '\n') )
+ : ((nextchr || locinput < regeol) && locinput[-1] == '\n') )
{
break;
}
- return 0;
+ sayNO;
case SBOL:
if (locinput == regbol && regprev == '\n')
break;
- return 0;
- case GBOL:
+ sayNO;
+ case GPOS:
if (locinput == regbol)
break;
- return 0;
+ sayNO;
case EOL:
if (multiline)
goto meol;
goto seol;
case MEOL:
meol:
- if ((nextchar || locinput < regeol) && nextchar != '\n')
- return 0;
+ if ((nextchr || locinput < regeol) && nextchr != '\n')
+ sayNO;
break;
case SEOL:
seol:
- if ((nextchar || locinput < regeol) && nextchar != '\n')
- return 0;
+ if ((nextchr || locinput < regeol) && nextchr != '\n')
+ sayNO;
if (regeol - locinput > 1)
- return 0;
+ sayNO;
+ break;
+ case EOS:
+ if (regeol != locinput)
+ sayNO;
break;
case SANY:
- if (!nextchar && locinput >= regeol)
- return 0;
- nextchar = *++locinput;
+ if (!nextchr && locinput >= regeol)
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
case ANY:
- if (!nextchar && locinput >= regeol || nextchar == '\n')
- return 0;
- nextchar = *++locinput;
+ if (!nextchr && locinput >= regeol || nextchr == '\n')
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
- case EXACTLY:
- s = OPERAND(scan);
- ln = *s++;
+ case EXACT:
+ s = (char *) OPERAND(scan);
+ ln = UCHARAT(s++);
/* Inline the first character, for speed. */
- if (*s != nextchar)
- return 0;
+ if (UCHARAT(s) != nextchr)
+ sayNO;
if (regeol - locinput < ln)
- return 0;
- if (ln > 1 && bcmp(s, locinput, ln) != 0)
- return 0;
+ sayNO;
+ if (ln > 1 && memNE(s, locinput, ln))
+ sayNO;
locinput += ln;
- nextchar = *locinput;
+ nextchr = UCHARAT(locinput);
+ break;
+ case EXACTFL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
+ case EXACTF:
+ s = (char *) OPERAND(scan);
+ ln = UCHARAT(s++);
+ /* Inline the first character, for speed. */
+ if (UCHARAT(s) != nextchr &&
+ UCHARAT(s) != ((OP(scan) == EXACTF)
+ ? fold : fold_locale)[nextchr])
+ sayNO;
+ if (regeol - locinput < ln)
+ sayNO;
+ if (ln > 1 && (OP(scan) == EXACTF
+ ? ibcmp(s, locinput, ln)
+ : ibcmp_locale(s, locinput, ln)))
+ sayNO;
+ locinput += ln;
+ nextchr = UCHARAT(locinput);
break;
case ANYOF:
- s = OPERAND(scan);
- if (nextchar < 0)
- nextchar = UCHARAT(locinput);
- if (s[nextchar >> 3] & (1 << (nextchar&7)))
- return 0;
- if (!nextchar && locinput >= regeol)
- return 0;
- nextchar = *++locinput;
+ s = (char *) OPERAND(scan);
+ if (nextchr < 0)
+ nextchr = UCHARAT(locinput);
+ if (!REGINCLASS(s, nextchr))
+ sayNO;
+ if (!nextchr && locinput >= regeol)
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
+ case ALNUML:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case ALNUM:
- if (!nextchar)
- return 0;
- if (!isALNUM(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!nextchr)
+ sayNO;
+ if (!(OP(scan) == ALNUM
+ ? isALNUM(nextchr) : isALNUM_LC(nextchr)))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
+ case NALNUML:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case NALNUM:
- if (!nextchar && locinput >= regeol)
- return 0;
- if (isALNUM(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!nextchr && locinput >= regeol)
+ sayNO;
+ if (OP(scan) == NALNUM
+ ? isALNUM(nextchr) : isALNUM_LC(nextchr))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
- case NBOUND:
+ case BOUNDL:
+ case NBOUNDL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case BOUND:
- if (locinput == regbol) /* was last char in word? */
- ln = isALNUM(regprev);
- else
- ln = isALNUM(locinput[-1]);
- n = isALNUM(nextchar); /* is next char in word? */
- if ((ln == n) == (OP(scan) == BOUND))
- return 0;
+ case NBOUND:
+ /* was last char in word? */
+ ln = (locinput != regbol) ? UCHARAT(locinput - 1) : regprev;
+ if (OP(scan) == BOUND || OP(scan) == NBOUND) {
+ ln = isALNUM(ln);
+ n = isALNUM(nextchr);
+ }
+ else {
+ ln = isALNUM_LC(ln);
+ n = isALNUM_LC(nextchr);
+ }
+ if (((!ln) == (!n)) == (OP(scan) == BOUND || OP(scan) == BOUNDL))
+ sayNO;
break;
+ case SPACEL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case SPACE:
- if (!nextchar && locinput >= regeol)
- return 0;
- if (!isSPACE(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!nextchr && locinput >= regeol)
+ sayNO;
+ if (!(OP(scan) == SPACE
+ ? isSPACE(nextchr) : isSPACE_LC(nextchr)))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
+ case NSPACEL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
case NSPACE:
- if (!nextchar)
- return 0;
- if (isSPACE(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!nextchr)
+ sayNO;
+ if (OP(scan) == SPACE
+ ? isSPACE(nextchr) : isSPACE_LC(nextchr))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
case DIGIT:
- if (!isDIGIT(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!isDIGIT(nextchr))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
case NDIGIT:
- if (!nextchar && locinput >= regeol)
- return 0;
- if (isDIGIT(nextchar))
- return 0;
- nextchar = *++locinput;
+ if (!nextchr && locinput >= regeol)
+ sayNO;
+ if (isDIGIT(nextchr))
+ sayNO;
+ nextchr = UCHARAT(++locinput);
break;
- case REF:
- n = ARG1(scan); /* which paren pair */
+ case REFFL:
+ reg_flags |= RF_tainted;
+ /* FALL THROUGH */
+ case REF:
+ case REFF:
+ n = ARG(scan); /* which paren pair */
s = regstartp[n];
- if (!s)
- return 0;
- if (!regendp[n])
- return 0;
+ if (*reglastparen < n || !s)
+ sayNO; /* Do not match unless seen CLOSEn. */
if (s == regendp[n])
break;
/* Inline the first character, for speed. */
- if (*s != nextchar)
- return 0;
+ if (UCHARAT(s) != nextchr &&
+ (OP(scan) == REF ||
+ (UCHARAT(s) != ((OP(scan) == REFF
+ ? fold : fold_locale)[nextchr]))))
+ sayNO;
ln = regendp[n] - s;
if (locinput + ln > regeol)
- return 0;
- if (ln > 1 && bcmp(s, locinput, ln) != 0)
- return 0;
+ sayNO;
+ if (ln > 1 && (OP(scan) == REF
+ ? memNE(s, locinput, ln)
+ : (OP(scan) == REFF
+ ? ibcmp(s, locinput, ln)
+ : ibcmp_locale(s, locinput, ln))))
+ sayNO;
locinput += ln;
- nextchar = *locinput;
+ nextchr = UCHARAT(locinput);
break;
case NOTHING:
+ case TAIL:
break;
case BACK:
break;
+ case EVAL:
+ {
+ dSP;
+ OP_4tree *oop = op;
+ COP *ocurcop = curcop;
+ SV **ocurpad = curpad;
+ SV *ret;
+
+ n = ARG(scan);
+ op = (OP_4tree*)regdata->data[n];
+ DEBUG_r( PerlIO_printf(Perl_debug_log, " re_eval 0x%x\n", op) );
+ curpad = AvARRAY((AV*)regdata->data[n + 1]);
+
+ CALLRUNOPS(); /* Scalar context. */
+ SPAGAIN;
+ ret = POPs;
+ PUTBACK;
+
+ if (logical) {
+ logical = 0;
+ sw = SvTRUE(ret);
+ } else
+ sv_setsv(save_scalar(replgv), ret);
+ op = oop;
+ curpad = ocurpad;
+ curcop = ocurcop;
+ break;
+ }
case OPEN:
- n = ARG1(scan); /* which paren pair */
- regstartp[n] = locinput;
+ n = ARG(scan); /* which paren pair */
+ reg_start_tmp[n] = locinput;
if (n > regsize)
regsize = n;
break;
case CLOSE:
- n = ARG1(scan); /* which paren pair */
+ n = ARG(scan); /* which paren pair */
+ regstartp[n] = reg_start_tmp[n];
regendp[n] = locinput;
if (n > *reglastparen)
*reglastparen = n;
break;
+ case GROUPP:
+ n = ARG(scan); /* which paren pair */
+ sw = (*reglastparen >= n && regendp[n] != NULL);
+ break;
+ case IFTHEN:
+ if (sw)
+ next = NEXTOPER(NEXTOPER(scan));
+ else {
+ next = scan + ARG(scan);
+ if (OP(next) == IFTHEN) /* Fake one. */
+ next = NEXTOPER(NEXTOPER(next));
+ }
+ break;
+ case LOGICAL:
+ logical = 1;
+ break;
case CURLYX: {
CURCUR cc;
CHECKPOINT cp = savestack_ix;
+
+ if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */
+ next += ARG(next);
cc.oldcc = regcc;
regcc = &cc;
cc.parenfloor = *reglastparen;
cc.cur = -1;
cc.min = ARG1(scan);
cc.max = ARG2(scan);
- cc.scan = NEXTOPER(scan) + 4;
+ cc.scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
cc.next = next;
cc.minmod = minmod;
cc.lastloc = 0;
n = regmatch(PREVOPER(next)); /* start on the WHILEM */
regcpblow(cp);
regcc = cc.oldcc;
- return n;
+ saySAME(n);
}
/* NOT REACHED */
case WHILEM: {
* that we can try again after backing off.
*/
+ CHECKPOINT cp, lastcp;
CURCUR* cc = regcc;
- n = cc->cur + 1;
+ char *lastloc = cc->lastloc; /* Detection of 0-len. */
+
+ n = cc->cur + 1; /* how many we know we matched */
reginput = locinput;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log,
+ "%*s %ld out of %ld..%ld cc=%lx\n",
+ REPORT_CODE_OFF+regindent*2, "",
+ (long)n, (long)cc->min,
+ (long)cc->max, (long)cc)
+ );
+
/* If degenerate scan matches "", assume scan done. */
- if (locinput == cc->lastloc) {
+ if (locinput == cc->lastloc && n >= cc->min) {
regcc = cc->oldcc;
ln = regcc->cur;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s empty match detected, try continuation...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
if (regmatch(cc->next))
- return TRUE;
+ sayYES;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s failed...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
regcc->cur = ln;
regcc = cc;
- return FALSE;
+ sayNO;
}
/* First just match a string of min scans. */
if (n < cc->min) {
cc->cur = n;
cc->lastloc = locinput;
- return regmatch(cc->scan);
+ if (regmatch(cc->scan))
+ sayYES;
+ cc->cur = n - 1;
+ cc->lastloc = lastloc;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s failed...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
+ sayNO;
}
/* Prefer next over scan for minimal matching. */
if (cc->minmod) {
regcc = cc->oldcc;
ln = regcc->cur;
- if (regmatch(cc->next))
- return TRUE; /* All done. */
+ cp = regcppush(cc->parenfloor);
+ REGCP_SET;
+ if (regmatch(cc->next)) {
+ regcpblow(cp);
+ sayYES; /* All done. */
+ }
+ REGCP_UNWIND;
+ regcppop();
regcc->cur = ln;
regcc = cc;
- if (n >= cc->max) /* Maximum greed exceeded? */
- return FALSE;
+ if (n >= cc->max) { /* Maximum greed exceeded? */
+ if (dowarn && n >= REG_INFTY
+ && !(reg_flags & RF_warned)) {
+ reg_flags |= RF_warned;
+ warn("count exceeded %d", REG_INFTY - 1);
+ }
+ sayNO;
+ }
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s trying longer...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
/* Try scanning more and see if it helps. */
reginput = locinput;
cc->cur = n;
cc->lastloc = locinput;
- return regmatch(cc->scan);
+ cp = regcppush(cc->parenfloor);
+ REGCP_SET;
+ if (regmatch(cc->scan)) {
+ regcpblow(cp);
+ sayYES;
+ }
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s failed...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
+ REGCP_UNWIND;
+ regcppop();
+ cc->cur = n - 1;
+ cc->lastloc = lastloc;
+ sayNO;
}
/* Prefer scan over next for maximal matching. */
if (n < cc->max) { /* More greed allowed? */
- regcppush(cc->parenfloor);
+ cp = regcppush(cc->parenfloor);
cc->cur = n;
cc->lastloc = locinput;
- if (regmatch(cc->scan))
- return TRUE;
+ REGCP_SET;
+ if (regmatch(cc->scan)) {
+ regcpblow(cp);
+ sayYES;
+ }
+ REGCP_UNWIND;
regcppop(); /* Restore some previous $<digit>s? */
reginput = locinput;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s failed, try continuation...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
+ }
+ if (dowarn && n >= REG_INFTY && !(reg_flags & RF_warned)) {
+ reg_flags |= RF_warned;
+ warn("count exceeded %d", REG_INFTY - 1);
}
/* Failed deeper matches of scan, so see if this one works. */
regcc = cc->oldcc;
ln = regcc->cur;
if (regmatch(cc->next))
- return TRUE;
+ sayYES;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s failed...\n", REPORT_CODE_OFF+regindent*2, "")
+ );
regcc->cur = ln;
regcc = cc;
- return FALSE;
+ cc->cur = n - 1;
+ cc->lastloc = lastloc;
+ sayNO;
}
/* NOT REACHED */
- case BRANCH: {
- if (OP(next) != BRANCH) /* No choice. */
- next = NEXTOPER(scan);/* Avoid recursion. */
+ case BRANCHJ:
+ next = scan + ARG(scan);
+ if (next == scan)
+ next = NULL;
+ inner = NEXTOPER(NEXTOPER(scan));
+ goto do_branch;
+ case BRANCH:
+ inner = NEXTOPER(scan);
+ do_branch:
+ {
+ CHECKPOINT lastcp;
+ c1 = OP(scan);
+ if (OP(next) != c1) /* No choice. */
+ next = inner; /* Avoid recursion. */
else {
int lastparen = *reglastparen;
+
+ REGCP_SET;
do {
reginput = locinput;
- if (regmatch(NEXTOPER(scan)))
- return 1;
+ if (regmatch(inner))
+ sayYES;
+ REGCP_UNWIND;
for (n = *reglastparen; n > lastparen; n--)
regendp[n] = 0;
*reglastparen = n;
-
-#ifdef REGALIGN
+ scan = next;
/*SUPPRESS 560*/
- if (n = NEXT(scan))
- scan += n;
+ if (n = (c1 == BRANCH ? NEXT_OFF(next) : ARG(next)))
+ next += n;
else
- scan = NULL;
-#else
- scan = regnext(scan);
-#endif
- } while (scan != NULL && OP(scan) == BRANCH);
- return 0;
+ next = NULL;
+ inner = NEXTOPER(scan);
+ if (c1 == BRANCHJ) {
+ inner = NEXTOPER(inner);
+ }
+ } while (scan != NULL && OP(scan) == c1);
+ sayNO;
/* NOTREACHED */
}
}
case MINMOD:
minmod = 1;
break;
+ case CURLYM:
+ {
+ I32 l = 0;
+ CHECKPOINT lastcp;
+
+ /* We suppose that the next guy does not need
+ backtracking: in particular, it is of constant length,
+ and has no parenths to influence future backrefs. */
+ ln = ARG1(scan); /* min to match */
+ n = ARG2(scan); /* max to match */
+ paren = scan->flags;
+ if (paren) {
+ if (paren > regsize)
+ regsize = paren;
+ if (paren > *reglastparen)
+ *reglastparen = paren;
+ }
+ scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
+ if (paren)
+ scan += NEXT_OFF(scan); /* Skip former OPEN. */
+ reginput = locinput;
+ if (minmod) {
+ minmod = 0;
+ if (ln && regrepeat_hard(scan, ln, &l) < ln)
+ sayNO;
+ if (ln && l == 0 && n >= ln
+ /* In fact, this is tricky. If paren, then the
+ fact that we did/didnot match may influence
+ future execution. */
+ && !(paren && ln == 0))
+ ln = n;
+ locinput = reginput;
+ if (regkind[(U8)OP(next)] == EXACT) {
+ c1 = UCHARAT(OPERAND(next) + 1);
+ if (OP(next) == EXACTF)
+ c2 = fold[c1];
+ else if (OP(next) == EXACTFL)
+ c2 = fold_locale[c1];
+ else
+ c2 = c1;
+ } else
+ c1 = c2 = -1000;
+ REGCP_SET;
+ /* This may be improved if l == 0. */
+ while (n >= ln || (n == REG_INFTY && ln > 0 && l)) { /* ln overflow ? */
+ /* If it could work, try it. */
+ if (c1 == -1000 ||
+ UCHARAT(reginput) == c1 ||
+ UCHARAT(reginput) == c2)
+ {
+ if (paren) {
+ if (n) {
+ regstartp[paren] = reginput - l;
+ regendp[paren] = reginput;
+ } else
+ regendp[paren] = NULL;
+ }
+ if (regmatch(next))
+ sayYES;
+ REGCP_UNWIND;
+ }
+ /* Couldn't or didn't -- move forward. */
+ reginput = locinput;
+ if (regrepeat_hard(scan, 1, &l)) {
+ ln++;
+ locinput = reginput;
+ }
+ else
+ sayNO;
+ }
+ } else {
+ n = regrepeat_hard(scan, n, &l);
+ if (n != 0 && l == 0
+ /* In fact, this is tricky. If paren, then the
+ fact that we did/didnot match may influence
+ future execution. */
+ && !(paren && ln == 0))
+ ln = n;
+ locinput = reginput;
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s matched %ld times, len=%ld...\n", REPORT_CODE_OFF+regindent*2, "", n, l)
+ );
+ if (n >= ln) {
+ if (regkind[(U8)OP(next)] == EXACT) {
+ c1 = UCHARAT(OPERAND(next) + 1);
+ if (OP(next) == EXACTF)
+ c2 = fold[c1];
+ else if (OP(next) == EXACTFL)
+ c2 = fold_locale[c1];
+ else
+ c2 = c1;
+ } else
+ c1 = c2 = -1000;
+ }
+ REGCP_SET;
+ while (n >= ln) {
+ /* If it could work, try it. */
+ if (c1 == -1000 ||
+ UCHARAT(reginput) == c1 ||
+ UCHARAT(reginput) == c2)
+ {
+ DEBUG_r(
+ PerlIO_printf(Perl_debug_log, "%*s trying tail with n=%ld...\n", REPORT_CODE_OFF+regindent*2, "", n)
+ );
+ if (paren) {
+ if (n) {
+ regstartp[paren] = reginput - l;
+ regendp[paren] = reginput;
+ } else
+ regendp[paren] = NULL;
+ }
+ if (regmatch(next))
+ sayYES;
+ REGCP_UNWIND;
+ }
+ /* Couldn't or didn't -- back up. */
+ n--;
+ locinput -= l;
+ reginput = locinput;
+ }
+ }
+ sayNO;
+ break;
+ }
+ case CURLYN:
+ paren = scan->flags; /* Which paren to set */
+ if (paren > regsize)
+ regsize = paren;
+ if (paren > *reglastparen)
+ *reglastparen = paren;
+ ln = ARG1(scan); /* min to match */
+ n = ARG2(scan); /* max to match */
+ scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE);
+ goto repeat;
case CURLY:
+ paren = 0;
ln = ARG1(scan); /* min to match */
n = ARG2(scan); /* max to match */
- scan = NEXTOPER(scan) + 4;
+ scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
goto repeat;
case STAR:
ln = 0;
- n = 32767;
+ n = REG_INFTY;
scan = NEXTOPER(scan);
+ paren = 0;
goto repeat;
case PLUS:
+ ln = 1;
+ n = REG_INFTY;
+ scan = NEXTOPER(scan);
+ paren = 0;
+ repeat:
/*
* Lookahead to avoid useless match attempts
* when we know what character comes next.
*/
- ln = 1;
- n = 32767;
- scan = NEXTOPER(scan);
- repeat:
- if (OP(next) == EXACTLY)
- nextchar = *(OPERAND(next)+1);
+ if (regkind[(U8)OP(next)] == EXACT) {
+ c1 = UCHARAT(OPERAND(next) + 1);
+ if (OP(next) == EXACTF)
+ c2 = fold[c1];
+ else if (OP(next) == EXACTFL)
+ c2 = fold_locale[c1];
+ else
+ c2 = c1;
+ }
else
- nextchar = -1000;
+ c1 = c2 = -1000;
reginput = locinput;
if (minmod) {
+ CHECKPOINT lastcp;
minmod = 0;
if (ln && regrepeat(scan, ln) < ln)
- return 0;
- while (n >= ln) {
+ sayNO;
+ REGCP_SET;
+ while (n >= ln || (n == REG_INFTY && ln > 0)) { /* ln overflow ? */
/* If it could work, try it. */
- if (nextchar == -1000 || *reginput == nextchar)
+ if (c1 == -1000 ||
+ UCHARAT(reginput) == c1 ||
+ UCHARAT(reginput) == c2)
+ {
+ if (paren) {
+ if (n) {
+ regstartp[paren] = reginput - 1;
+ regendp[paren] = reginput;
+ } else
+ regendp[paren] = NULL;
+ }
if (regmatch(next))
- return 1;
- /* Couldn't or didn't -- back up. */
+ sayYES;
+ REGCP_UNWIND;
+ }
+ /* Couldn't or didn't -- move forward. */
reginput = locinput + ln;
if (regrepeat(scan, 1)) {
ln++;
reginput = locinput + ln;
- }
- else
- return 0;
+ } else
+ sayNO;
}
}
else {
+ CHECKPOINT lastcp;
n = regrepeat(scan, n);
if (ln < n && regkind[(U8)OP(next)] == EOL &&
- (!multiline || OP(next) == SEOL))
+ (!multiline || OP(next) == SEOL))
ln = n; /* why back off? */
- while (n >= ln) {
- /* If it could work, try it. */
- if (nextchar == -1000 || *reginput == nextchar)
- if (regmatch(next))
- return 1;
- /* Couldn't or didn't -- back up. */
- n--;
- reginput = locinput + n;
+ REGCP_SET;
+ if (paren) {
+ while (n >= ln) {
+ /* If it could work, try it. */
+ if (c1 == -1000 ||
+ UCHARAT(reginput) == c1 ||
+ UCHARAT(reginput) == c2)
+ {
+ if (paren && n) {
+ if (n) {
+ regstartp[paren] = reginput - 1;
+ regendp[paren] = reginput;
+ } else
+ regendp[paren] = NULL;
+ }
+ if (regmatch(next))
+ sayYES;
+ REGCP_UNWIND;
+ }
+ /* Couldn't or didn't -- back up. */
+ n--;
+ reginput = locinput + n;
+ }
+ } else {
+ while (n >= ln) {
+ /* If it could work, try it. */
+ if (c1 == -1000 ||
+ UCHARAT(reginput) == c1 ||
+ UCHARAT(reginput) == c2)
+ {
+ if (regmatch(next))
+ sayYES;
+ REGCP_UNWIND;
+ }
+ /* Couldn't or didn't -- back up. */
+ n--;
+ reginput = locinput + n;
+ }
}
}
- return 0;
- case SUCCEED:
+ sayNO;
+ break;
case END:
+ if (locinput < regtill)
+ sayNO; /* Cannot match: too short. */
+ /* Fall through */
+ case SUCCEED:
reginput = locinput; /* put where regtry can find it */
- return 1; /* Success! */
- case IFMATCH:
- reginput = locinput;
- scan = NEXTOPER(scan);
- if (!regmatch(scan))
- return 0;
- break;
+ sayYES; /* Success! */
+ case SUSPEND:
+ n = 1;
+ goto do_ifmatch;
case UNLESSM:
- reginput = locinput;
- scan = NEXTOPER(scan);
- if (regmatch(scan))
- return 0;
+ n = 0;
+ if (locinput < bostr + scan->flags)
+ goto say_yes;
+ goto do_ifmatch;
+ case IFMATCH:
+ n = 1;
+ if (locinput < bostr + scan->flags)
+ goto say_no;
+ do_ifmatch:
+ reginput = locinput - scan->flags;
+ inner = NEXTOPER(NEXTOPER(scan));
+ if (regmatch(inner) != n) {
+ say_no:
+ if (logical) {
+ logical = 0;
+ sw = 0;
+ goto do_longjump;
+ } else
+ sayNO;
+ }
+ say_yes:
+ if (logical) {
+ logical = 0;
+ sw = 1;
+ }
+ if (OP(scan) == SUSPEND) {
+ locinput = reginput;
+ nextchr = UCHARAT(locinput);
+ }
+ /* FALL THROUGH. */
+ case LONGJMP:
+ do_longjump:
+ next = scan + ARG(scan);
+ if (next == scan)
+ next = NULL;
break;
default:
- fprintf(stderr, "%x %d\n",(unsigned)scan,scan[1]);
+ PerlIO_printf(PerlIO_stderr(), "%lx %d\n",
+ (unsigned long)scan, OP(scan));
FAIL("regexp memory corruption");
}
scan = next;
*/
FAIL("corrupted regexp pointers");
/*NOTREACHED*/
+ sayNO;
+
+yes:
+#ifdef DEBUGGING
+ regindent--;
+#endif
+ return 1;
+
+no:
+#ifdef DEBUGGING
+ regindent--;
+#endif
return 0;
}
* That was true before, but now we assume scan - reginput is the count,
* rather than incrementing count on every character.]
*/
-static I32
-regrepeat(p, max)
-char *p;
-I32 max;
+STATIC I32
+regrepeat(regnode *p, I32 max)
{
register char *scan;
register char *opnd;
register char *loceol = regeol;
scan = reginput;
- if (max != 32767 && max < loceol - scan)
+ if (max != REG_INFTY && max < loceol - scan)
loceol = scan + max;
- opnd = OPERAND(p);
+ opnd = (char *) OPERAND(p);
switch (OP(p)) {
case ANY:
while (scan < loceol && *scan != '\n')
case SANY:
scan = loceol;
break;
- case EXACTLY: /* length of string is 1 */
- opnd++;
- while (scan < loceol && *opnd == *scan)
+ case EXACT: /* length of string is 1 */
+ c = UCHARAT(++opnd);
+ while (scan < loceol && UCHARAT(scan) == c)
+ scan++;
+ break;
+ case EXACTF: /* length of string is 1 */
+ c = UCHARAT(++opnd);
+ while (scan < loceol &&
+ (UCHARAT(scan) == c || UCHARAT(scan) == fold[c]))
+ scan++;
+ break;
+ case EXACTFL: /* length of string is 1 */
+ reg_flags |= RF_tainted;
+ c = UCHARAT(++opnd);
+ while (scan < loceol &&
+ (UCHARAT(scan) == c || UCHARAT(scan) == fold_locale[c]))
scan++;
break;
case ANYOF:
- c = UCHARAT(scan);
- while (scan < loceol && !(opnd[c >> 3] & (1 << (c & 7)))) {
+ while (scan < loceol && REGINCLASS(opnd, *scan))
scan++;
- c = UCHARAT(scan);
- }
break;
case ALNUM:
while (scan < loceol && isALNUM(*scan))
scan++;
break;
+ case ALNUML:
+ reg_flags |= RF_tainted;
+ while (scan < loceol && isALNUM_LC(*scan))
+ scan++;
+ break;
case NALNUM:
while (scan < loceol && !isALNUM(*scan))
scan++;
break;
+ case NALNUML:
+ reg_flags |= RF_tainted;
+ while (scan < loceol && !isALNUM_LC(*scan))
+ scan++;
+ break;
case SPACE:
while (scan < loceol && isSPACE(*scan))
scan++;
break;
+ case SPACEL:
+ reg_flags |= RF_tainted;
+ while (scan < loceol && isSPACE_LC(*scan))
+ scan++;
+ break;
case NSPACE:
while (scan < loceol && !isSPACE(*scan))
scan++;
break;
+ case NSPACEL:
+ reg_flags |= RF_tainted;
+ while (scan < loceol && !isSPACE_LC(*scan))
+ scan++;
+ break;
case DIGIT:
while (scan < loceol && isDIGIT(*scan))
scan++;
c = scan - reginput;
reginput = scan;
+ DEBUG_r(
+ {
+ SV *prop = sv_newmortal();
+
+ regprop(prop, p);
+ PerlIO_printf(Perl_debug_log,
+ "%*s %s can match %ld times out of %ld...\n",
+ REPORT_CODE_OFF+1, "", SvPVX(prop),c,max);
+ });
+
return(c);
}
/*
- - regnext - dig the "next" pointer out of a node
- *
- * [Note, when REGALIGN is defined there are two places in regmatch()
- * that bypass this code for speed.]
+ - regrepeat_hard - repeatedly match something, report total lenth and length
+ *
+ * The repeater is supposed to have constant length.
*/
-char *
-regnext(p)
-register char *p;
+
+STATIC I32
+regrepeat_hard(regnode *p, I32 max, I32 *lp)
{
- register I32 offset;
+ register char *scan;
+ register char *start;
+ register char *loceol = regeol;
+ I32 l = -1;
- if (p == ®dummy)
- return(NULL);
+ start = reginput;
+ while (reginput < loceol && (scan = reginput, regmatch(p))) {
+ if (l == -1) {
+ *lp = l = reginput - start;
+ if (max != REG_INFTY && l*max < loceol - scan)
+ loceol = scan + l*max;
+ if (l == 0) {
+ return max;
+ }
+ }
+ }
+ if (reginput < loceol)
+ reginput = scan;
+ else
+ scan = reginput;
+
+ return (scan - start)/l;
+}
- offset = NEXT(p);
- if (offset == 0)
- return(NULL);
+/*
+ - regclass - determine if a character falls into a character class
+ */
-#ifdef REGALIGN
- return(p+offset);
-#else
- if (OP(p) == BACK)
- return(p-offset);
- else
- return(p+offset);
-#endif
+STATIC bool
+reginclass(register char *p, register I32 c)
+{
+ char flags = *p;
+ bool match = FALSE;
+
+ c &= 0xFF;
+ if (ANYOF_TEST(p, c))
+ match = TRUE;
+ else if (flags & ANYOF_FOLD) {
+ I32 cf;
+ if (flags & ANYOF_LOCALE) {
+ reg_flags |= RF_tainted;
+ cf = fold_locale[c];
+ }
+ else
+ cf = fold[c];
+ if (ANYOF_TEST(p, cf))
+ match = TRUE;
+ }
+
+ if (!match && (flags & ANYOF_ISA)) {
+ reg_flags |= RF_tainted;
+
+ if (((flags & ANYOF_ALNUML) && isALNUM_LC(c)) ||
+ ((flags & ANYOF_NALNUML) && !isALNUM_LC(c)) ||
+ ((flags & ANYOF_SPACEL) && isSPACE_LC(c)) ||
+ ((flags & ANYOF_NSPACEL) && !isSPACE_LC(c)))
+ {
+ match = TRUE;
+ }
+ }
+
+ return (flags & ANYOF_INVERT) ? !match : match;
}
+
+
+
https://perl5.git.perl.org / perl5.git / blobdiff