forked from schacon/perl
/
regcomp.c
4599 lines (4318 loc) · 127 KB
/
regcomp.c
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/* regcomp.c
*/
/*
* "A fair jaw-cracker dwarf-language must be." --Samwise Gamgee
*/
/* 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.
*/
#ifdef PERL_EXT_RE_BUILD
/* need to replace pregcomp et al, so enable that */
# ifndef PERL_IN_XSUB_RE
# define PERL_IN_XSUB_RE
# endif
/* need access to debugger hooks */
# if defined(PERL_EXT_RE_DEBUG) && !defined(DEBUGGING)
# define DEBUGGING
# endif
#endif
#ifdef PERL_IN_XSUB_RE
/* We *really* need to overwrite these symbols: */
# define Perl_pregcomp my_regcomp
# define Perl_regdump my_regdump
# define Perl_regprop my_regprop
# define Perl_pregfree my_regfree
# define Perl_re_intuit_string my_re_intuit_string
/* *These* symbols are masked to allow static link. */
# define Perl_regnext my_regnext
# define Perl_save_re_context my_save_re_context
# define Perl_reginitcolors my_reginitcolors
# define PERL_NO_GET_CONTEXT
#endif
/*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) 1991-2001, 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.
*/
#include "EXTERN.h"
#define PERL_IN_REGCOMP_C
#include "perl.h"
#ifdef PERL_IN_XSUB_RE
# if defined(PERL_CAPI) || defined(PERL_OBJECT)
# include "XSUB.h"
# endif
#else
# include "INTERN.h"
#endif
#define REG_COMP_C
#include "regcomp.h"
#ifdef op
#undef op
#endif /* op */
#ifdef MSDOS
# if defined(BUGGY_MSC6)
/* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */
# pragma optimize("a",off)
/* But MSC 6.00A is happy with 'w', for aliases only across function calls*/
# pragma optimize("w",on )
# endif /* BUGGY_MSC6 */
#endif /* MSDOS */
#ifndef STATIC
#define STATIC static
#endif
#define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
#define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
((*s) == '{' && regcurly(s)))
#ifdef SPSTART
#undef SPSTART /* dratted cpp namespace... */
#endif
/*
* Flags to be passed up and down.
*/
#define WORST 0 /* Worst case. */
#define HASWIDTH 0x1 /* Known to match non-null strings. */
#define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */
#define SPSTART 0x4 /* Starts with * or +. */
#define TRYAGAIN 0x8 /* Weeded out a declaration. */
/* Length of a variant. */
typedef struct scan_data_t {
I32 len_min;
I32 len_delta;
I32 pos_min;
I32 pos_delta;
SV *last_found;
I32 last_end; /* min value, <0 unless valid. */
I32 last_start_min;
I32 last_start_max;
SV **longest; /* Either &l_fixed, or &l_float. */
SV *longest_fixed;
I32 offset_fixed;
SV *longest_float;
I32 offset_float_min;
I32 offset_float_max;
I32 flags;
I32 whilem_c;
I32 *last_closep;
struct regnode_charclass_class *start_class;
} scan_data_t;
/*
* Forward declarations for pregcomp()'s friends.
*/
static scan_data_t zero_scan_data = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0};
#define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
#define SF_BEFORE_SEOL 0x1
#define SF_BEFORE_MEOL 0x2
#define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
#define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
#ifdef NO_UNARY_PLUS
# define SF_FIX_SHIFT_EOL (0+2)
# define SF_FL_SHIFT_EOL (0+4)
#else
# define SF_FIX_SHIFT_EOL (+2)
# define SF_FL_SHIFT_EOL (+4)
#endif
#define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
#define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
#define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
#define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
#define SF_IS_INF 0x40
#define SF_HAS_PAR 0x80
#define SF_IN_PAR 0x100
#define SF_HAS_EVAL 0x200
#define SCF_DO_SUBSTR 0x400
#define SCF_DO_STCLASS_AND 0x0800
#define SCF_DO_STCLASS_OR 0x1000
#define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
#define SCF_WHILEM_VISITED_POS 0x2000
#define RF_utf8 8
#define UTF (PL_reg_flags & RF_utf8)
#define LOC (PL_regflags & PMf_LOCALE)
#define FOLD (PL_regflags & PMf_FOLD)
#define OOB_CHAR8 1234
#define OOB_UTF8 123456
#define OOB_NAMEDCLASS -1
#define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
#define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
/* length of regex to show in messages that don't mark a position within */
#define RegexLengthToShowInErrorMessages 127
/*
* If MARKER[12] are adjusted, be sure to adjust the constants at the top
* of t/op/regmesg.t, the tests in t/op/re_tests, and those in
* op/pragma/warn/regcomp.
*/
#define MARKER1 "HERE" /* marker as it appears in the description */
#define MARKER2 " << HERE " /* marker as it appears within the regex */
#define REPORT_LOCATION " before " MARKER1 " mark in regex m/%.*s" MARKER2 "%s/"
/*
* Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
* arg. Show regex, up to a maximum length. If it's too long, chop and add
* "...".
*/
#define FAIL(msg) \
STMT_START { \
char *ellipses = ""; \
unsigned len = strlen(PL_regprecomp); \
\
if (!SIZE_ONLY) \
SAVEDESTRUCTOR_X(clear_re,(void*)PL_regcomp_rx); \
\
if (len > RegexLengthToShowInErrorMessages) { \
/* chop 10 shorter than the max, to ensure meaning of "..." */ \
len = RegexLengthToShowInErrorMessages - 10; \
ellipses = "..."; \
} \
Perl_croak(aTHX_ "%s in regex m/%.*s%s/", \
msg, (int)len, PL_regprecomp, ellipses); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
* args. Show regex, up to a maximum length. If it's too long, chop and add
* "...".
*/
#define FAIL2(pat,msg) \
STMT_START { \
char *ellipses = ""; \
unsigned len = strlen(PL_regprecomp); \
\
if (!SIZE_ONLY) \
SAVEDESTRUCTOR_X(clear_re,(void*)PL_regcomp_rx); \
\
if (len > RegexLengthToShowInErrorMessages) { \
/* chop 10 shorter than the max, to ensure meaning of "..." */ \
len = RegexLengthToShowInErrorMessages - 10; \
ellipses = "..."; \
} \
S_re_croak2(aTHX_ pat, " in regex m/%.*s%s/", \
msg, (int)len, PL_regprecomp, ellipses); \
} STMT_END
/*
* Simple_vFAIL -- like FAIL, but marks the current location in the scan
*/
#define Simple_vFAIL(m) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-PL_regcomp_parse); \
\
Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
m, (int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
*/
#define vFAIL(m) \
STMT_START { \
if (!SIZE_ONLY) \
SAVEDESTRUCTOR_X(clear_re,(void*)PL_regcomp_rx); \
Simple_vFAIL(m); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts two arguments.
*/
#define Simple_vFAIL2(m,a1) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-PL_regcomp_parse); \
\
S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, \
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
*/
#define vFAIL2(m,a1) \
STMT_START { \
if (!SIZE_ONLY) \
SAVEDESTRUCTOR_X(clear_re,(void*)PL_regcomp_rx); \
Simple_vFAIL2(m, a1); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts three arguments.
*/
#define Simple_vFAIL3(m, a1, a2) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-PL_regcomp_parse); \
\
S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, \
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
*/
#define vFAIL3(m,a1,a2) \
STMT_START { \
if (!SIZE_ONLY) \
SAVEDESTRUCTOR_X(clear_re,(void*)PL_regcomp_rx); \
Simple_vFAIL3(m, a1, a2); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts four arguments.
*/
#define Simple_vFAIL4(m, a1, a2, a3) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-PL_regcomp_parse); \
\
S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3,\
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts five arguments.
*/
#define Simple_vFAIL5(m, a1, a2, a3, a4) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-PL_regcomp_parse); \
S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, a4,\
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
#define vWARN(loc,m) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-(loc)); \
Perl_warner(aTHX_ WARN_REGEXP, "%s" REPORT_LOCATION,\
m, (int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END \
#define vWARN2(loc, m, a1) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-(loc)); \
Perl_warner(aTHX_ WARN_REGEXP, m REPORT_LOCATION,\
a1, \
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
#define vWARN3(loc, m, a1, a2) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp) - (PL_regxend - (loc)); \
Perl_warner(aTHX_ WARN_REGEXP, m REPORT_LOCATION, \
a1, a2, \
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
#define vWARN4(loc, m, a1, a2, a3) \
STMT_START { \
unsigned offset = strlen(PL_regprecomp)-(PL_regxend-(loc)); \
Perl_warner(aTHX_ WARN_REGEXP, m REPORT_LOCATION,\
a1, a2, a3, \
(int)offset, PL_regprecomp, PL_regprecomp + offset); \
} STMT_END
/* Allow for side effects in s */
#define REGC(c,s) STMT_START { if (!SIZE_ONLY) *(s) = (c); else (s);} STMT_END
static void clear_re(pTHXo_ void *r);
/* Mark that we cannot extend a found fixed substring at this point.
Updata the longest found anchored substring and the longest found
floating substrings if needed. */
STATIC void
S_scan_commit(pTHX_ scan_data_t *data)
{
STRLEN l = CHR_SVLEN(data->last_found);
STRLEN old_l = CHR_SVLEN(*data->longest);
if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
sv_setsv(*data->longest, data->last_found);
if (*data->longest == data->longest_fixed) {
data->offset_fixed = l ? data->last_start_min : data->pos_min;
if (data->flags & SF_BEFORE_EOL)
data->flags
|= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
else
data->flags &= ~SF_FIX_BEFORE_EOL;
}
else {
data->offset_float_min = l ? data->last_start_min : data->pos_min;
data->offset_float_max = (l
? data->last_start_max
: data->pos_min + data->pos_delta);
if (data->flags & SF_BEFORE_EOL)
data->flags
|= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
else
data->flags &= ~SF_FL_BEFORE_EOL;
}
}
SvCUR_set(data->last_found, 0);
data->last_end = -1;
data->flags &= ~SF_BEFORE_EOL;
}
/* Can match anything (initialization) */
STATIC void
S_cl_anything(pTHX_ struct regnode_charclass_class *cl)
{
int value;
ANYOF_CLASS_ZERO(cl);
for (value = 0; value < 256; ++value)
ANYOF_BITMAP_SET(cl, value);
cl->flags = ANYOF_EOS;
if (LOC)
cl->flags |= ANYOF_LOCALE;
}
/* Can match anything (initialization) */
STATIC int
S_cl_is_anything(pTHX_ struct regnode_charclass_class *cl)
{
int value;
for (value = 0; value <= ANYOF_MAX; value += 2)
if (ANYOF_CLASS_TEST(cl, value) && ANYOF_CLASS_TEST(cl, value + 1))
return 1;
for (value = 0; value < 256; ++value)
if (!ANYOF_BITMAP_TEST(cl, value))
return 0;
return 1;
}
/* Can match anything (initialization) */
STATIC void
S_cl_init(pTHX_ struct regnode_charclass_class *cl)
{
Zero(cl, 1, struct regnode_charclass_class);
cl->type = ANYOF;
cl_anything(cl);
}
STATIC void
S_cl_init_zero(pTHX_ struct regnode_charclass_class *cl)
{
Zero(cl, 1, struct regnode_charclass_class);
cl->type = ANYOF;
cl_anything(cl);
if (LOC)
cl->flags |= ANYOF_LOCALE;
}
/* 'And' a given class with another one. Can create false positives */
/* We assume that cl is not inverted */
STATIC void
S_cl_and(pTHX_ struct regnode_charclass_class *cl,
struct regnode_charclass_class *and_with)
{
if (!(and_with->flags & ANYOF_CLASS)
&& !(cl->flags & ANYOF_CLASS)
&& (and_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
&& !(and_with->flags & ANYOF_FOLD)
&& !(cl->flags & ANYOF_FOLD)) {
int i;
if (and_with->flags & ANYOF_INVERT)
for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
cl->bitmap[i] &= ~and_with->bitmap[i];
else
for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
cl->bitmap[i] &= and_with->bitmap[i];
} /* XXXX: logic is complicated otherwise, leave it along for a moment. */
if (!(and_with->flags & ANYOF_EOS))
cl->flags &= ~ANYOF_EOS;
}
/* 'OR' a given class with another one. Can create false positives */
/* We assume that cl is not inverted */
STATIC void
S_cl_or(pTHX_ struct regnode_charclass_class *cl, struct regnode_charclass_class *or_with)
{
if (or_with->flags & ANYOF_INVERT) {
/* We do not use
* (B1 | CL1) | (!B2 & !CL2) = (B1 | !B2 & !CL2) | (CL1 | (!B2 & !CL2))
* <= (B1 | !B2) | (CL1 | !CL2)
* which is wasteful if CL2 is small, but we ignore CL2:
* (B1 | CL1) | (!B2 & !CL2) <= (B1 | CL1) | !B2 = (B1 | !B2) | CL1
* XXXX Can we handle case-fold? Unclear:
* (OK1(i) | OK1(i')) | !(OK1(i) | OK1(i')) =
* (OK1(i) | OK1(i')) | (!OK1(i) & !OK1(i'))
*/
if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
&& !(or_with->flags & ANYOF_FOLD)
&& !(cl->flags & ANYOF_FOLD) ) {
int i;
for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
cl->bitmap[i] |= ~or_with->bitmap[i];
} /* XXXX: logic is complicated otherwise */
else {
cl_anything(cl);
}
} else {
/* (B1 | CL1) | (B2 | CL2) = (B1 | B2) | (CL1 | CL2)) */
if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
&& (!(or_with->flags & ANYOF_FOLD)
|| (cl->flags & ANYOF_FOLD)) ) {
int i;
/* OR char bitmap and class bitmap separately */
for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
cl->bitmap[i] |= or_with->bitmap[i];
if (or_with->flags & ANYOF_CLASS) {
for (i = 0; i < ANYOF_CLASSBITMAP_SIZE; i++)
cl->classflags[i] |= or_with->classflags[i];
cl->flags |= ANYOF_CLASS;
}
}
else { /* XXXX: logic is complicated, leave it along for a moment. */
cl_anything(cl);
}
}
if (or_with->flags & ANYOF_EOS)
cl->flags |= ANYOF_EOS;
}
/* REx optimizer. Converts nodes into quickier variants "in place".
Finds fixed substrings. */
/* Stops at toplevel WHILEM as well as at `last'. At end *scanp is set
to the position after last scanned or to NULL. */
STATIC I32
S_study_chunk(pTHX_ regnode **scanp, I32 *deltap, regnode *last, scan_data_t *data, U32 flags)
/* scanp: Start here (read-write). */
/* deltap: Write maxlen-minlen here. */
/* last: Stop before this one. */
{
I32 min = 0, pars = 0, code;
regnode *scan = *scanp, *next;
I32 delta = 0;
int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
int is_inf_internal = 0; /* The studied chunk is infinite */
I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
scan_data_t data_fake;
struct regnode_charclass_class and_with; /* Valid if flags & SCF_DO_STCLASS_OR */
while (scan && OP(scan) != END && scan < last) {
/* Peephole optimizer: */
if (PL_regkind[(U8)OP(scan)] == EXACT) {
/* Merge several consecutive EXACTish nodes into one. */
regnode *n = regnext(scan);
U32 stringok = 1;
#ifdef DEBUGGING
regnode *stop = scan;
#endif
next = scan + NODE_SZ_STR(scan);
/* Skip NOTHING, merge EXACT*. */
while (n &&
( PL_regkind[(U8)OP(n)] == NOTHING ||
(stringok && (OP(n) == OP(scan))))
&& NEXT_OFF(n)
&& NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
if (OP(n) == TAIL || n > next)
stringok = 0;
if (PL_regkind[(U8)OP(n)] == NOTHING) {
NEXT_OFF(scan) += NEXT_OFF(n);
next = n + NODE_STEP_REGNODE;
#ifdef DEBUGGING
if (stringok)
stop = n;
#endif
n = regnext(n);
}
else if (stringok) {
int oldl = STR_LEN(scan);
regnode *nnext = regnext(n);
if (oldl + STR_LEN(n) > U8_MAX)
break;
NEXT_OFF(scan) += NEXT_OFF(n);
STR_LEN(scan) += STR_LEN(n);
next = n + NODE_SZ_STR(n);
/* Now we can overwrite *n : */
Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
#ifdef DEBUGGING
stop = next - 1;
#endif
n = nnext;
}
}
#ifdef DEBUGGING
/* Allow dumping */
n = scan + NODE_SZ_STR(scan);
while (n <= stop) {
if (PL_regkind[(U8)OP(n)] != NOTHING || OP(n) == NOTHING) {
OP(n) = OPTIMIZED;
NEXT_OFF(n) = 0;
}
n++;
}
#endif
}
/* Follow the next-chain of the current node and optimize
away all the NOTHINGs from it. */
if (OP(scan) != CURLYX) {
int max = (reg_off_by_arg[OP(scan)]
? I32_MAX
/* I32 may be smaller than U16 on CRAYs! */
: (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
int noff;
regnode *n = scan;
/* Skip NOTHING and LONGJMP. */
while ((n = regnext(n))
&& ((PL_regkind[(U8)OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
|| ((OP(n) == LONGJMP) && (noff = ARG(n))))
&& off + noff < max)
off += noff;
if (reg_off_by_arg[OP(scan)])
ARG(scan) = off;
else
NEXT_OFF(scan) = off;
}
/* The principal pseudo-switch. Cannot be a switch, since we
look into several different things. */
if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
|| OP(scan) == IFTHEN || OP(scan) == SUSPEND) {
next = regnext(scan);
code = OP(scan);
if (OP(next) == code || code == IFTHEN || code == SUSPEND) {
I32 max1 = 0, min1 = I32_MAX, num = 0;
struct regnode_charclass_class accum;
if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
scan_commit(data); /* Cannot merge strings after this. */
if (flags & SCF_DO_STCLASS)
cl_init_zero(&accum);
while (OP(scan) == code) {
I32 deltanext, minnext, f = 0, fake = 0;
struct regnode_charclass_class this_class;
num++;
data_fake.flags = 0;
if (data) {
data_fake.whilem_c = data->whilem_c;
data_fake.last_closep = data->last_closep;
}
else
data_fake.last_closep = &fake;
next = regnext(scan);
scan = NEXTOPER(scan);
if (code != BRANCH)
scan = NEXTOPER(scan);
if (flags & SCF_DO_STCLASS) {
cl_init(&this_class);
data_fake.start_class = &this_class;
f = SCF_DO_STCLASS_AND;
}
if (flags & SCF_WHILEM_VISITED_POS)
f |= SCF_WHILEM_VISITED_POS;
/* we suppose the run is continuous, last=next...*/
minnext = study_chunk(&scan, &deltanext, next,
&data_fake, f);
if (min1 > minnext)
min1 = minnext;
if (max1 < minnext + deltanext)
max1 = minnext + deltanext;
if (deltanext == I32_MAX)
is_inf = is_inf_internal = 1;
scan = next;
if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
pars++;
if (data && (data_fake.flags & SF_HAS_EVAL))
data->flags |= SF_HAS_EVAL;
if (data)
data->whilem_c = data_fake.whilem_c;
if (flags & SCF_DO_STCLASS)
cl_or(&accum, &this_class);
if (code == SUSPEND)
break;
}
if (code == IFTHEN && num < 2) /* Empty ELSE branch */
min1 = 0;
if (flags & SCF_DO_SUBSTR) {
data->pos_min += min1;
data->pos_delta += max1 - min1;
if (max1 != min1 || is_inf)
data->longest = &(data->longest_float);
}
min += min1;
delta += max1 - min1;
if (flags & SCF_DO_STCLASS_OR) {
cl_or(data->start_class, &accum);
if (min1) {
cl_and(data->start_class, &and_with);
flags &= ~SCF_DO_STCLASS;
}
}
else if (flags & SCF_DO_STCLASS_AND) {
if (min1) {
cl_and(data->start_class, &accum);
flags &= ~SCF_DO_STCLASS;
}
else {
/* Switch to OR mode: cache the old value of
* data->start_class */
StructCopy(data->start_class, &and_with,
struct regnode_charclass_class);
flags &= ~SCF_DO_STCLASS_AND;
StructCopy(&accum, data->start_class,
struct regnode_charclass_class);
flags |= SCF_DO_STCLASS_OR;
data->start_class->flags |= ANYOF_EOS;
}
}
}
else if (code == BRANCHJ) /* single branch is optimized. */
scan = NEXTOPER(NEXTOPER(scan));
else /* single branch is optimized. */
scan = NEXTOPER(scan);
continue;
}
else if (OP(scan) == EXACT) {
I32 l = STR_LEN(scan);
if (UTF) {
unsigned char *s = (unsigned char *)STRING(scan);
unsigned char *e = s + l;
I32 newl = 0;
while (s < e) {
newl++;
s += UTF8SKIP(s);
}
l = newl;
}
min += l;
if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
/* The code below prefers earlier match for fixed
offset, later match for variable offset. */
if (data->last_end == -1) { /* Update the start info. */
data->last_start_min = data->pos_min;
data->last_start_max = is_inf
? I32_MAX : data->pos_min + data->pos_delta;
}
sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
data->last_end = data->pos_min + l;
data->pos_min += l; /* As in the first entry. */
data->flags &= ~SF_BEFORE_EOL;
}
if (flags & SCF_DO_STCLASS_AND) {
/* Check whether it is compatible with what we know already! */
int compat = 1;
if (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
&& !ANYOF_BITMAP_TEST(data->start_class, *STRING(scan))
&& (!(data->start_class->flags & ANYOF_FOLD)
|| !ANYOF_BITMAP_TEST(data->start_class,
PL_fold[*(U8*)STRING(scan)])))
compat = 0;
ANYOF_CLASS_ZERO(data->start_class);
ANYOF_BITMAP_ZERO(data->start_class);
if (compat)
ANYOF_BITMAP_SET(data->start_class, *STRING(scan));
data->start_class->flags &= ~ANYOF_EOS;
}
else if (flags & SCF_DO_STCLASS_OR) {
/* false positive possible if the class is case-folded */
ANYOF_BITMAP_SET(data->start_class, *STRING(scan));
data->start_class->flags &= ~ANYOF_EOS;
cl_and(data->start_class, &and_with);
}
flags &= ~SCF_DO_STCLASS;
}
else if (PL_regkind[(U8)OP(scan)] == EXACT) { /* But OP != EXACT! */
I32 l = STR_LEN(scan);
/* Search for fixed substrings supports EXACT only. */
if (flags & SCF_DO_SUBSTR)
scan_commit(data);
if (UTF) {
unsigned char *s = (unsigned char *)STRING(scan);
unsigned char *e = s + l;
I32 newl = 0;
while (s < e) {
newl++;
s += UTF8SKIP(s);
}
l = newl;
}
min += l;
if (data && (flags & SCF_DO_SUBSTR))
data->pos_min += l;
if (flags & SCF_DO_STCLASS_AND) {
/* Check whether it is compatible with what we know already! */
int compat = 1;
if (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
&& !ANYOF_BITMAP_TEST(data->start_class, *STRING(scan))
&& !ANYOF_BITMAP_TEST(data->start_class,
PL_fold[*(U8*)STRING(scan)]))
compat = 0;
ANYOF_CLASS_ZERO(data->start_class);
ANYOF_BITMAP_ZERO(data->start_class);
if (compat) {
ANYOF_BITMAP_SET(data->start_class, *STRING(scan));
data->start_class->flags &= ~ANYOF_EOS;
data->start_class->flags |= ANYOF_FOLD;
if (OP(scan) == EXACTFL)
data->start_class->flags |= ANYOF_LOCALE;
}
}
else if (flags & SCF_DO_STCLASS_OR) {
if (data->start_class->flags & ANYOF_FOLD) {
/* false positive possible if the class is case-folded.
Assume that the locale settings are the same... */
ANYOF_BITMAP_SET(data->start_class, *STRING(scan));
data->start_class->flags &= ~ANYOF_EOS;
}
cl_and(data->start_class, &and_with);
}
flags &= ~SCF_DO_STCLASS;
}
else if (strchr((char*)PL_varies,OP(scan))) {
I32 mincount, maxcount, minnext, deltanext, fl;
I32 f = flags, pos_before = 0;
regnode *oscan = scan;
struct regnode_charclass_class this_class;
struct regnode_charclass_class *oclass = NULL;
switch (PL_regkind[(U8)OP(scan)]) {
case WHILEM: /* End of (?:...)* . */
scan = NEXTOPER(scan);
goto finish;
case PLUS:
if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
next = NEXTOPER(scan);
if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
mincount = 1;
maxcount = REG_INFTY;
next = regnext(scan);
scan = NEXTOPER(scan);
goto do_curly;
}
}
if (flags & SCF_DO_SUBSTR)
data->pos_min++;
min++;
/* Fall through. */
case STAR:
if (flags & SCF_DO_STCLASS) {
mincount = 0;
maxcount = REG_INFTY;
next = regnext(scan);
scan = NEXTOPER(scan);
goto do_curly;
}
is_inf = is_inf_internal = 1;
scan = regnext(scan);
if (flags & SCF_DO_SUBSTR) {
scan_commit(data); /* Cannot extend fixed substrings */
data->longest = &(data->longest_float);
}
goto optimize_curly_tail;
case CURLY:
mincount = ARG1(scan);
maxcount = ARG2(scan);
next = regnext(scan);
if (OP(scan) == CURLYX) {
I32 lp = (data ? *(data->last_closep) : 0);
scan->flags = ((lp <= U8_MAX) ? lp : U8_MAX);
}
scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
do_curly:
if (flags & SCF_DO_SUBSTR) {
if (mincount == 0) scan_commit(data); /* Cannot extend fixed substrings */
pos_before = data->pos_min;
}
if (data) {
fl = data->flags;
data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
if (is_inf)
data->flags |= SF_IS_INF;
}
if (flags & SCF_DO_STCLASS) {
cl_init(&this_class);
oclass = data->start_class;
data->start_class = &this_class;
f |= SCF_DO_STCLASS_AND;
f &= ~SCF_DO_STCLASS_OR;
}
/* These are the cases when once a subexpression
fails at a particular position, it cannot succeed
even after backtracking at the enclosing scope.
XXXX what if minimal match and we are at the
initial run of {n,m}? */
if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
f &= ~SCF_WHILEM_VISITED_POS;
/* This will finish on WHILEM, setting scan, or on NULL: */
minnext = study_chunk(&scan, &deltanext, last, data,
mincount == 0
? (f & ~SCF_DO_SUBSTR) : f);
if (flags & SCF_DO_STCLASS)
data->start_class = oclass;
if (mincount == 0 || minnext == 0) {
if (flags & SCF_DO_STCLASS_OR) {
cl_or(data->start_class, &this_class);
}
else if (flags & SCF_DO_STCLASS_AND) {
/* Switch to OR mode: cache the old value of
* data->start_class */
StructCopy(data->start_class, &and_with,
struct regnode_charclass_class);
flags &= ~SCF_DO_STCLASS_AND;
StructCopy(&this_class, data->start_class,
struct regnode_charclass_class);
flags |= SCF_DO_STCLASS_OR;
data->start_class->flags |= ANYOF_EOS;
}
} else { /* Non-zero len */
if (flags & SCF_DO_STCLASS_OR) {
cl_or(data->start_class, &this_class);
cl_and(data->start_class, &and_with);
}
else if (flags & SCF_DO_STCLASS_AND)
cl_and(data->start_class, &this_class);
flags &= ~SCF_DO_STCLASS;
}
if (!scan) /* It was not CURLYX, but CURLY. */
scan = next;
if (ckWARN(WARN_REGEXP) && (minnext + deltanext == 0)
&& !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
&& maxcount <= REG_INFTY/3) /* Complement check for big count */
{
vWARN(PL_regcomp_parse,
"Quantifier unexpected on zero-length expression");
}
min += minnext * mincount;
is_inf_internal |= ((maxcount == REG_INFTY
&& (minnext + deltanext) > 0)
|| deltanext == I32_MAX);
is_inf |= is_inf_internal;
delta += (minnext + deltanext) * maxcount - minnext * mincount;
/* Try powerful optimization CURLYX => CURLYN. */
if ( OP(oscan) == CURLYX && data
&& data->flags & SF_IN_PAR
&& !(data->flags & SF_HAS_EVAL)
&& !deltanext && minnext == 1 ) {
/* Try to optimize to CURLYN. */
regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
regnode *nxt1 = nxt, *nxt2;
/* Skip open. */
nxt = regnext(nxt);
if (!strchr((char*)PL_simple,OP(nxt))
&& !(PL_regkind[(U8)OP(nxt)] == EXACT
&& STR_LEN(nxt) == 1))
goto nogo;
nxt2 = nxt;
nxt = regnext(nxt);
if (OP(nxt) != CLOSE)
goto nogo;
/* Now we know that nxt2 is the only contents: */
oscan->flags = ARG(nxt);
OP(oscan) = CURLYN;
OP(nxt1) = NOTHING; /* was OPEN. */
#ifdef DEBUGGING
OP(nxt1 + 1) = OPTIMIZED; /* was count. */
NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
OP(nxt) = OPTIMIZED; /* was CLOSE. */
OP(nxt + 1) = OPTIMIZED; /* was count. */
NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
#endif