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bregexec.cpp
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bregexec.cpp
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//
// bregexec.cc
//
////////////////////////////////////////////////////////////////////////////////
// 1999.11.24 update by Tatsuo Baba
//
// You may distribute under the terms of either the GNU General Public
// License or the Artistic License, as specified in the perl_license.txt file.
////////////////////////////////////////////////////////////////////////////////
/*
* "One Ring to rule them all, One Ring to find them..."
*/
/* NOTE: this is derived from Henry Spencer's regexp code, and should not
* confused with the original package (see point 3 below). Thanks, Henry!
*/
/* Additional note: this code is very heavily munged from Henry's version
* in places. In some spots I've traded clarity for efficiency, so don't
* 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*/
/*
* 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.
*
* Permission is granted to anyone to use this software for any
* purpose on any computer system, and to redistribute it freely,
* subject to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of
* this software, no matter how awful, even if they arise
* from defects in it.
*
* 2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission.
*
* 3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
**** Alterations to Henry's code are...
****
**** Copyright (c) 1991-1994, 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.
*
* Beware that some of this code is subtly aware of the way operator
* precedence is structured in regular expressions. Serious changes in
* regular-expression syntax might require a total rethink.
*/
////////////////////////////////////////////////////////////////////////////////
// Alterations to Larry Wall's code are...
// Copyright 1999 Tatsuo Baba
//
// 1999.11.24 Tatsuo Baba
//
// You may distribute under the terms of either the GNU General Public
// License or the Artistic License, as specified in the perl_license.txt file.
////////////////////////////////////////////////////////////////////////////////
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define KANJI
//#include "config.h"
#include "global.h"
//#include "handy.h" in perl.h
#include "sv.h"
#include "intreg.h"
#define ISKANJI(c) iskanji(c)
int matchanyof(unsigned int c,unsigned char *tbl);
static int regtry(regexp *prog, char *startpos,GLOBAL*);//own
static int regrepeat(char *p, int max,GLOBAL*);
/* return values of kpart */
#define KPART_KANJI_1 1 /* kanji 1st byte */
#define KPART_KANJI_2 2 /* kanji 2nd byte */
#define KPART_OTHER 0 /* other (ASCII) */
int kpart(char *pLim,char *pChr);
#define DEFSTATIC
#ifndef STATIC
#define STATIC static
#endif
#ifdef KANJI
#undef isascii
#define isascii(c) (0 < (c) && (c) < 0x7F)
#endif /* KANJI */
typedef int CHECKPOINT;
static CHECKPOINT regcppush(int parenfloor,GLOBAL*);
char * regcppop (GLOBAL*);
#define regcpblow(cp) leave_scope(cp)
#define croak
/*
* pregexec and friends
*/
/*
* Forwards.
*/
/*
- bregexec - match a regexp against a string
*/
BOOL bregexec(register regexp *prog,char *stringarg,
register char *strend, /* pointer to null at end of string */
char *strbeg, /* real beginning of string */
int minend, /* end of match must be at least minend after stringarg */
int safebase, /* no need to remember string in subbase */
char *msg) /* fatal error message */
{
register char *s;
register int i;
register char *c;
register char *startpos = stringarg;
register int tmp;
msg[0] = '\0'; //ensure message clear
if (startpos == strend) // length 0 bye bye
return 0;
GLOBAL global;
GLOBAL *globalp;
globalp = &global;
memset((void*)globalp,0,sizeof(GLOBAL));
multiline = prog->pmflags & PMf_MULTILINE;
kanji_mode_flag = prog->pmflags & PMf_KANJI; // using KANJI_MODE macro
int minlen = 0; /* must match at least this many chars */
int dontbother = 0; /* how many characters not to try at end */
CURCUR cc;
cc.cur = 0;
cc.oldcc = 0;
regcc = &cc;
/* Be paranoid... */
if (prog == NULL || startpos == NULL) {
// croak("NULL parameter");
return 0;
}
////////// exception started
try {
if (startpos == strbeg) /* is ^ valid at stringarg? */
regprev = '\n';
else {
regprev = stringarg[-1];
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);
c = new char[i+1];
if (c == NULL)
croak("out of space copy string");
memcpy(c,startpos,i+1);
startpos = c;
strend = startpos + i;
for (s = startpos; s < strend; s++)
#ifdef KANJI
if (KANJI_MODE && iskanji(*s) && s+1 < strend)
s++;
else if (isUPPER(*s))
#else /* KANJI */
if (isUPPER(*s))
#endif /* ! KANJI */
*s = toLOWER(*s);
}
/* If there is a "must appear" string, look for it. */
s = startpos;
if (prog->regmust != NULL &&
(!(prog->reganch & ROPT_ANCH)
|| (multiline && prog->regback >= 0)) )
{
// if (stringarg == strbeg && screamer) {
// if (screamfirst[BmRARE(prog->regmust)] >= 0)
// s = screaminstr(screamer,prog->regmust);
// else
// s = NULL;
// }
// else
s = fbm_instr((unsigned char*)s, (unsigned char*)strend,
prog->regmust,multiline,KANJI_MODE);
if (!s) {
++BmUSEFUL(prog->regmust); /* 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 = NULL; /* disable regmust */
s = startpos;
}
else {
s = startpos;
minlen = SvCUR(prog->regmust);
}
}
#ifdef KANJI
if (s && KANJI_MODE && kpart(startpos, s) == KPART_KANJI_2) {
s = startpos;
}
#endif /* KANJI */
/* Mark beginning of line for ^ . */
regbol = startpos;
/* 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;
/* Simplest case: anchored match need be tried only once. */
/* [unless multiline is set] */
if (prog->reganch & ROPT_ANCH) {
if (regtry(prog, startpos,globalp))
goto got_it;
else if (multiline || (prog->reganch & ROPT_IMPLICIT)) {
if (minlen)
dontbother = minlen - 1;
strend -= dontbother;
/* for multiline we only have to try after newlines */
if (s > startpos)
s--;
while (s < strend) {
if (*s++ == '\n') {
if (s < strend && regtry(prog, s,globalp))
goto got_it;
}
}
}
goto phooey;
}
/* 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,globalp))
goto got_it;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s) && s+1<strend) s++;
s++;
while (s < strend && *s == i) {
if (KANJI_MODE && iskanji(*s) && s+1<strend) s++;
s++;
}
#else /* KANJI */
s++;
while (s < strend && *s == i)
s++;
#endif /* ! KANJI */
}
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,multiline,KANJI_MODE)) != NULL)
{
if (regtry(prog, s,globalp))
goto got_it;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s) && s+1<strend) s++;
#endif
s++;
}
}
else {
c = SvPVX(prog->regstart);
while ((s = ninstr(s, strend, c, c + SvCUR(prog->regstart),KANJI_MODE)) != NULL)
{
if (regtry(prog, s,globalp))
goto got_it;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s) && s+1<strend) s++;
#endif
s++;
}
}
goto phooey;
}
/*SUPPRESS 560*/
if (c = prog->regstclass) {
int doevery = (prog->reganch & ROPT_SKIP) == 0;
if (minlen)
dontbother = minlen - 1;
strend -= dontbother; /* don't bother with what can't match */
tmp = 1;
/* We know what class it must start with. */
switch (OP(c)) {
case ANYOF:
c = OPERAND(c);
while (s < strend) {
i = UCHARAT(s);
#ifdef KANJI
if (KANJI_MODE && iskanji(i) && s+1 < strend) {
s++;
i = (i << 8) + UCHARAT(s);
s--;
}
if (matchanyof(i, (unsigned char*)c)) {
#else /* KANJI */
if (!(c[i >> 3] & (1 << (i&7)))) {
#endif /* !KANJI */
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case BOUND:
if (minlen)
dontbother++,strend--;
if (s != startpos) {
i = s[-1];
tmp = isALNUM(i);
}
else
tmp = isALNUM(regprev); /* assume not alphanumeric */
while (s < strend) {
i = *s;
if (tmp != isALNUM(i)) {
tmp = !tmp;
if (regtry(prog, s,globalp))
goto got_it;
}
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
if ((minlen || tmp) && regtry(prog,s,globalp))
goto got_it;
break;
case NBOUND:
if (minlen)
dontbother++,strend--;
if (s != startpos) {
i = s[-1];
tmp = isALNUM(i);
}
else
tmp = isALNUM(regprev); /* assume not alphanumeric */
while (s < strend) {
i = *s;
if (tmp != isALNUM(i))
tmp = !tmp;
else if (regtry(prog, s,globalp))
goto got_it;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
if ((minlen || !tmp) && regtry(prog,s,globalp))
goto got_it;
break;
case ALNUM:
while (s < strend) {
i = *s;
if (isALNUM(i)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case NALNUM:
while (s < strend) {
i = *s;
if (!isALNUM(i)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case SPACE:
while (s < strend) {
if (isSPACE(*s)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case NSPACE:
while (s < strend) {
if (!isSPACE(*s)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case DIGIT:
while (s < strend) {
if (isDIGIT(*s)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
case NDIGIT:
while (s < strend) {
if (!isDIGIT(*s)) {
if (tmp && regtry(prog, s,globalp))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
s++;
}
break;
}
}
else {
if (minlen)
dontbother = minlen - 1;
strend -= dontbother;
/* We don't know much -- general case. */
do {
if (regtry(prog, s,globalp))
goto got_it;
#ifdef KANJI
if (KANJI_MODE && iskanji(*s)) s++;
#endif
} while (s++ < strend);
}
/* Failure. */
goto phooey;
got_it:
strend += dontbother; /* uncheat */
prog->subbeg = strbeg;
prog->subend = strend;
// if ((!safebase && (prog->nparens || sawampersand)) || prog->do_folding) {
if ((!safebase && (prog->nparens)) || 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)
// Safefree(prog->subbase);
delete [] prog->subbase;
prog->subbeg = prog->subbase = s;
prog->subend = s+i;
}
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);
}
}
if (prog->do_folding)
// Safefree(startpos);
delete [] startpos;
}
if (savestack)
delete [] savestack;
return 1;
phooey:
if (prog->do_folding)
// Safefree(startpos);
delete [] startpos;
if (savestack)
delete [] savestack;
return 0;
} // error handler start
catch (const char* err){
strcpy(msg,err);
if (savestack)
delete [] savestack;
return 0;
}
catch (...){
strcpy(msg,"fatal error");
if (savestack)
delete [] savestack;
return 0;
}
}
////////////////////////////////XXXXXXXXXXXXX
/*
- regmatch - main matching routine
*
* Conceptually the strategy is simple: check to see whether the current
* node matches, call self recursively to see whether the rest matches,
* and then act accordingly. In practice we make some effort to avoid
* recursion, in particular by going through "ordinary" nodes (that don't
* need to know whether the rest of the match failed) by a loop instead of
* by recursion.
*/
/* [lwall] I've hoisted the register declarations to the outer block in order to
* 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 int /* 0 failure, 1 success */
regmatch(char *prog,register GLOBAL* globalp)
{
register char *scan; /* Current node. */
char *next; /* Next node. */
register int localNextchar;
register int n; /* no or next */
register int ln; /* len or last */
register char *s; /* operand or save */
register char *locinput = reginput;
int minmod = 0;
localNextchar = *locinput;
scan = prog;
while (scan != NULL) {
#define sayYES return 1
#define sayNO return 0
#define saySAME(x) return x
#ifdef REGALIGN
next = scan + NEXT(scan);
if (next == scan)
next = NULL;
#else
next = regnext(scan);
#endif
switch (OP(scan)) {
case BOL:
if (locinput == regbol
? regprev == '\n'
: ((localNextchar || locinput < regeol) && locinput[-1] == '\n') )
{
/* regtill = regbol; */
break;
}
sayNO;
case MBOL:
if (locinput == regbol
? regprev == '\n'
: ((localNextchar || locinput < regeol) && locinput[-1] == '\n') )
{
break;
}
sayNO;
case SBOL:
if (locinput == regbol && regprev == '\n')
break;
sayNO;
case GBOL:
if (locinput == regbol)
break;
sayNO;
case EOL:
if (multiline)
goto meol;
else
goto seol;
case MEOL:
meol:
if ((localNextchar || locinput < regeol) && localNextchar != '\n')
sayNO;
break;
case SEOL:
seol:
if ((localNextchar || locinput < regeol) && localNextchar != '\n')
sayNO;
if (regeol - locinput > 1)
sayNO;
break;
case SANY:
if (!localNextchar && locinput >= regeol)
sayNO;
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1]) ++locinput;
#endif
localNextchar = *++locinput;
break;
case ANY:
if (!localNextchar && locinput >= regeol || localNextchar == '\n')
sayNO;
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1]) ++locinput;
#endif
localNextchar = *++locinput;
break;
case EXACTLY:
s = OPERAND(scan);
ln = *s++;
/* Inline the first character, for speed. */
if (*s != localNextchar)
sayNO;
if (regeol - locinput < ln)
sayNO;
if (ln > 1 && memcmp(s, locinput, ln) != 0)
sayNO;
locinput += ln;
localNextchar = *locinput;
break;
case ANYOF:
s = OPERAND(scan);
if (localNextchar < 0)
localNextchar = UCHARAT(locinput);
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1]) {
locinput++;
localNextchar = (localNextchar << 8) + UCHARAT(locinput);
}
if (!matchanyof(localNextchar,(unsigned char*) s))
#else /* KANJI */
if (s[localNextchar >> 3] & (1 << (localNextchar&7)))
#endif /* ! KANJI */
sayNO;
if (!localNextchar && locinput >= regeol)
sayNO;
localNextchar = *++locinput;
break;
case ALNUM:
if (!localNextchar)
sayNO;
if (!isALNUM(localNextchar))
sayNO;
localNextchar = *++locinput;
break;
case NALNUM:
if (!localNextchar && locinput >= regeol)
sayNO;
if (isALNUM(localNextchar))
sayNO;
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1])
++locinput;
#endif
localNextchar = *++locinput;
break;
case NBOUND:
case BOUND:
if (locinput == regbol) /* was last char in word? */
ln = isALNUM(regprev);
else
ln = isALNUM(locinput[-1]);
n = isALNUM(localNextchar); /* is next char in word? */
if ((ln == n) == (OP(scan) == BOUND))
sayNO;
break;
case SPACE:
if (!localNextchar && locinput >= regeol)
sayNO;
if (!isSPACE(localNextchar))
sayNO;
localNextchar = *++locinput;
break;
case NSPACE:
if (!localNextchar)
sayNO;
if (isSPACE(localNextchar))
sayNO;
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1])
++locinput;
#endif
localNextchar = *++locinput;
break;
case DIGIT:
if (!isDIGIT(localNextchar))
sayNO;
localNextchar = *++locinput;
break;
case NDIGIT:
if (!localNextchar && locinput >= regeol)
sayNO;
if (isDIGIT(localNextchar))
sayNO;
#ifdef KANJI
if (KANJI_MODE && iskanji(localNextchar) && locinput[1])
++locinput;
#endif
localNextchar = *++locinput;
break;
case REF:
n = ARG1(scan); /* which paren pair */
s = regstartp[n];
if (!s)
sayNO;
if (!regendp[n])
sayNO;
if (s == regendp[n])
break;
/* Inline the first character, for speed. */
if (*s != localNextchar)
sayNO;
ln = regendp[n] - s;
if (locinput + ln > regeol)
sayNO;
if (ln > 1 && memcmp(s, locinput, ln) != 0)
sayNO;
locinput += ln;
localNextchar = *locinput;
break;
case NOTHING:
break;
case BACK:
break;
case OPEN:
n = ARG1(scan); /* which paren pair */
regstartp[n] = locinput;
if (n > regsize)
regsize = n;
break;
case CLOSE:
n = ARG1(scan); /* which paren pair */
regendp[n] = locinput;
if (n > *reglastparen)
*reglastparen = n;
break;
case CURLYX: {
CURCUR cc;
CHECKPOINT cp = savestack_ix;
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.next = next;
cc.minmod = minmod;
cc.lastloc = 0;
reginput = locinput;
n = regmatch(PREVOPER(next),globalp); /* start on the WHILEM */
// regcpblow(cp);
regcc = cc.oldcc;
saySAME(n);
}
/* NOT REACHED */
case WHILEM: {
/*
* This is really hard to understand, because after we match
* what we're trying to match, we must make sure the rest of
* the RE is going to match for sure, and to do that we have
* to go back UP the parse tree by recursing ever deeper. And
* if it fails, we have to reset our parent's current state
* that we can try again after backing off.
*/
CURCUR* cc = regcc;
n = cc->cur + 1; /* how many we know we matched */
reginput = locinput;
/* If degenerate scan matches "", assume scan done. */
if (locinput == cc->lastloc) {
regcc = cc->oldcc;
ln = regcc->cur;
if (regmatch(cc->next,globalp))
sayYES;
regcc->cur = ln;
regcc = cc;
sayNO;
}
/* First just match a string of min scans. */
if (n < cc->min) {
cc->cur = n;
cc->lastloc = locinput;
if (regmatch(cc->scan,globalp))
sayYES;
cc->cur = n - 1;
sayNO;
}
/* Prefer next over scan for minimal matching. */
if (cc->minmod) {
regcc = cc->oldcc;
ln = regcc->cur;
if (regmatch(cc->next,globalp))
sayYES; /* All done. */
regcc->cur = ln;
regcc = cc;
if (n >= cc->max) /* Maximum greed exceeded? */
sayNO;
/* Try scanning more and see if it helps. */
reginput = locinput;
cc->cur = n;
cc->lastloc = locinput;
if (regmatch(cc->scan,globalp))
sayYES;
cc->cur = n - 1;
sayNO;
}
/* Prefer scan over next for maximal matching. */
if (n < cc->max) { /* More greed allowed? */
regcppush(cc->parenfloor,globalp);
cc->cur = n;
cc->lastloc = locinput;
if (regmatch(cc->scan,globalp))
sayYES;
regcppop(globalp); /* Restore some previous $<digit>s? */
reginput = locinput;
}
/* Failed deeper matches of scan, so see if this one works. */
regcc = cc->oldcc;
ln = regcc->cur;
if (regmatch(cc->next,globalp))
sayYES;
regcc->cur = ln;
regcc = cc;
cc->cur = n - 1;
sayNO;
}
/* NOT REACHED */
case BRANCH: {
if (OP(next) != BRANCH) /* No choice. */
next = NEXTOPER(scan);/* Avoid recursion. */
else {
int lastparen = *reglastparen;
do {
reginput = locinput;
if (regmatch(NEXTOPER(scan),globalp))
sayYES;
for (n = *reglastparen; n > lastparen; n--)
regendp[n] = 0;
*reglastparen = n;
#ifdef REGALIGN
/*SUPPRESS 560*/
if (n = NEXT(scan))
scan += n;
else
scan = NULL;
#else
scan = regnext(scan);
#endif
} while (scan != NULL && OP(scan) == BRANCH);
sayNO;
/* NOTREACHED */
}
}
break;
case MINMOD:
minmod = 1;
break;
case CURLY:
ln = ARG1(scan); /* min to match */
n = ARG2(scan); /* max to match */
scan = NEXTOPER(scan) + 4;
goto repeat;