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Plan9.xs
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Plan9.xs
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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <utf.h>
#include <fmt.h>
#include <regexp9.h>
#include "Plan9.h"
REGEXP *
Plan9_comp(pTHX_ const SV * const pattern, const U32 flags)
{
REGEXP * rx;
Reprog * re;
STRLEN plen;
char* exp = SvPV((SV*)pattern, plen);
char* xend = exp + plen;
U32 extflags = flags;
/* C<split " ">, bypass the Plan 9 engine alltogether and act as perl does */
if (flags & RXf_SPLIT && plen == 1 && exp[0] == ' ')
extflags |= (RXf_SKIPWHITE|RXf_WHITE);
/* RXf_START_ONLY - Have C<split /^/> split on newlines */
if (plen == 1 && exp[0] == '^')
extflags |= RXf_START_ONLY;
/* RXf_WHITE - Have C<split /\s+/> split on whitespace */
else if (plen == 3 && strnEQ("\\s+", exp, 3))
extflags |= RXf_WHITE;
/* REGEX structure for perl */
Newxz(rx, 1, REGEXP);
rx->refcnt = 1;
rx->extflags = extflags;
rx->engine = &engine_plan9;
/* Precompiled regexp for pp_regcomp to use */
rx->prelen = (I32)plen;
rx->precomp = SAVEPVN(exp, rx->prelen);
/* qr// stringification, reuse the space */
rx->wraplen = rx->prelen;
rx->wrapped = (char *)rx->precomp; /* from const char* */
/* Catch invalid modifiers, the rest of the flags are ignored */
if (flags & (RXf_PMf_MULTILINE|RXf_PMf_FOLD|RXf_PMf_KEEPCOPY))
if (flags & RXf_PMf_MULTILINE) /* /m */
croak("The `m' modifier is not supported by re::engine::Plan9");
else if (flags & RXf_PMf_FOLD) /* /i */
croak("The `i' modifier is not supported by re::engine::Plan9");
else if (flags & RXf_PMf_KEEPCOPY) /* /p */
croak("The `p' modifier is not supported by re::engine::Plan9");
/* Modifiers valid, compile with the requested variant */
if (flags & PMf_EXTENDED) /* /x */
re = regcomplit(exp);
if (flags & PMf_SINGLELINE) /* /s */
re = regcompnl(exp);
else
re = regcomp(exp); /* / */
if (re == 0)
croak("Internal error in Plan 9 `regcomp'");
/* Save for use in Plan9_exec */
rx->pprivate = re;
/* We always allocate 32 buffers */
rx->nparens = NSUBEXP;
Newxz(rx->offs, NSUBEXP + 1, regexp_paren_pair);
return rx;
}
I32
Plan9_exec(pTHX_ REGEXP * const rx, char *stringarg, char *strend,
char *strbeg, I32 minend, SV * sv,
void *data, U32 flags)
{
Reprog *re = rx->pprivate;
Resub *match;;
int ret;
I32 i;
char *s, *e;
Newxz(match, NSUBEXP, Resub);
rx->subbeg = strbeg;
rx->sublen = strend - strbeg;
match[0].s.sp = stringarg;
match[0].e.ep = strend;
ret = regexec(re, stringarg, match, NSUBEXP);
/* Explicitly documented to return 1 on success */
if (ret != 1) {
Safefree(match);
return 0;
}
/* Populate the match buffers, starting with $& */
for (i = 0; match[i].s.sp; i++) {
rx->offs[i].start = match[i].s.sp - strbeg;
rx->offs[i].end = match[i].e.ep - strbeg;
}
Safefree(match);
/* Now that we actually know nparens set it to the currect value
so split and //g will work */
rx->nparens = i - 1;
/* Mark the rest as unpopulated */
for (; i <= NSUBEXP; i++) {
rx->offs[i].start = -1;
rx->offs[i].end = -1;
}
/* Matched! */
return 1;
}
char *
Plan9_intuit(pTHX_ REGEXP * const rx, SV * sv, char *strpos,
char *strend, U32 flags, re_scream_pos_data *data)
{
PERL_UNUSED_ARG(rx);
PERL_UNUSED_ARG(sv);
PERL_UNUSED_ARG(strpos);
PERL_UNUSED_ARG(strend);
PERL_UNUSED_ARG(flags);
PERL_UNUSED_ARG(data);
return NULL;
}
SV *
Plan9_checkstr(pTHX_ REGEXP * const rx)
{
PERL_UNUSED_ARG(rx);
return NULL;
}
void
Plan9_free(pTHX_ REGEXP * const rx)
{
free(rx->pprivate);
}
void *
Plan9_dupe(pTHX_ REGEXP * const rx, CLONE_PARAMS *param)
{
PERL_UNUSED_ARG(param);
Reprog * re;
Copy(rx->pprivate, re, 1, Reprog);
return re;
}
SV *
Plan9_package(pTHX_ REGEXP * const rx)
{
PERL_UNUSED_ARG(rx);
return newSVpvs("re::engine::Plan9");
}
MODULE = re::engine::Plan9 PACKAGE = re::engine::Plan9
PROTOTYPES: ENABLE
void
ENGINE(...)
PROTOTYPE:
PPCODE:
XPUSHs(sv_2mortal(newSViv(PTR2IV(&engine_plan9))));