forked from ruby/ruby
/
re.c
1160 lines (1008 loc) · 24.2 KB
/
re.c
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/************************************************
re.c -
$Author$
created at: Mon Aug 9 18:24:49 JST 1993
Copyright (C) 1993-1999 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "re.h"
static VALUE rb_eRegxpError;
#define BEG(no) regs->beg[no]
#define END(no) regs->end[no]
#if 'a' == 97 /* it's ascii */
static char casetable[] = {
'\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
'\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
'\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
'\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
/* ' ' '!' '"' '#' '$' '%' '&' ''' */
'\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
/* '(' ')' '*' '+' ',' '-' '.' '/' */
'\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
/* '0' '1' '2' '3' '4' '5' '6' '7' */
'\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
/* '8' '9' ':' ';' '<' '=' '>' '?' */
'\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
/* '@' 'A' 'B' 'C' 'D' 'E' 'F' 'G' */
'\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
/* 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O' */
'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
/* 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' */
'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
/* 'X' 'Y' 'Z' '[' '\' ']' '^' '_' */
'\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
/* '`' 'a' 'b' 'c' 'd' 'e' 'f' 'g' */
'\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
/* 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o' */
'\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
/* 'p' 'q' 'r' 's' 't' 'u' 'v' 'w' */
'\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
/* 'x' 'y' 'z' '{' '|' '}' '~' */
'\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
'\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
'\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
'\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
'\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
'\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
'\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
'\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
'\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
'\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
'\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
'\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
'\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
'\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
'\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
'\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};
#else
>>> "You lose. You will need a translation table for your character set." <<<
#endif
#define MIN(a,b) (((a)>(b))?(b):(a))
int
rb_str_cicmp(str1, str2)
VALUE str1, str2;
{
int len, i;
char *p1, *p2;
len = MIN(RSTRING(str1)->len, RSTRING(str2)->len);
p1 = RSTRING(str1)->ptr; p2 = RSTRING(str2)->ptr;
for (i = 0; i < len; i++, p1++, p2++) {
if (casetable[(unsigned)*p1] != casetable[(unsigned)*p2])
return casetable[(unsigned)*p1] - casetable[(unsigned)*p2];
}
return RSTRING(str1)->len - RSTRING(str2)->len;
}
#define REG_IGNORECASE FL_USER0
#define REG_CASESTATE FL_USER1
#define KCODE_NONE 0
#define KCODE_EUC FL_USER2
#define KCODE_SJIS FL_USER3
#define KCODE_UTF8 FL_USER4
#define KCODE_FIXED FL_USER5
#define KCODE_MASK (KCODE_EUC|KCODE_SJIS|KCODE_UTF8)
static int reg_kcode =
#ifdef RUBY_USE_EUC
KCODE_EUC;
#else
# ifdef RUBY_USE_SJIS
KCODE_SJIS;
# else
# ifdef RUBY_USE_UTF8
KCODE_UTF8
# else
KCODE_NONE;
# endif
# endif
#endif
static void
kcode_euc(reg)
struct RRegexp *reg;
{
FL_UNSET(reg, KCODE_MASK);
FL_SET(reg, KCODE_EUC);
FL_SET(reg, KCODE_FIXED);
}
static void
kcode_sjis(reg)
struct RRegexp *reg;
{
FL_UNSET(reg, KCODE_MASK);
FL_SET(reg, KCODE_SJIS);
FL_SET(reg, KCODE_FIXED);
}
static void
kcode_utf8(reg)
struct RRegexp *reg;
{
FL_UNSET(reg, KCODE_MASK);
FL_SET(reg, KCODE_UTF8);
FL_SET(reg, KCODE_FIXED);
}
static void
kcode_none(reg)
struct RRegexp *reg;
{
FL_UNSET(reg, KCODE_MASK);
FL_SET(reg, KCODE_FIXED);
}
static int curr_kcode;
static void
kcode_set_option(reg)
VALUE reg;
{
if (!FL_TEST(reg, KCODE_FIXED)) return;
curr_kcode = RBASIC(reg)->flags & KCODE_MASK;
if (reg_kcode == curr_kcode) return;
switch (curr_kcode) {
case KCODE_NONE:
re_mbcinit(MBCTYPE_ASCII);
break;
case KCODE_EUC:
re_mbcinit(MBCTYPE_EUC);
break;
case KCODE_SJIS:
re_mbcinit(MBCTYPE_SJIS);
break;
case KCODE_UTF8:
re_mbcinit(MBCTYPE_UTF8);
break;
}
}
static void
kcode_reset_option()
{
if (reg_kcode == curr_kcode) return;
switch (reg_kcode) {
case KCODE_NONE:
re_mbcinit(MBCTYPE_ASCII);
break;
case KCODE_EUC:
re_mbcinit(MBCTYPE_EUC);
break;
case KCODE_SJIS:
re_mbcinit(MBCTYPE_SJIS);
break;
case KCODE_UTF8:
re_mbcinit(MBCTYPE_UTF8);
break;
}
}
extern int ruby_in_compile;
static void
rb_reg_expr_str(str, s, len)
VALUE str;
char *s;
int len;
{
char *p, *pend;
int slash = 0;
p = s; pend = p + len;
while (p<pend) {
if (*p == '/') {
slash = 1;
break;
}
p++;
}
if (!slash) {
rb_str_cat(str, s, len);
}
else {
p = s;
while (p<pend) {
if (*p == '/') {
char c = '\\';
rb_str_cat(str, &c, 1);
rb_str_cat(str, p, 1);
}
else {
rb_str_cat(str, p, 1);
}
p++;
}
}
}
static VALUE
rb_reg_desc(s, len, re)
char *s;
int len;
VALUE re;
{
VALUE str = rb_str_new2("/");
rb_reg_expr_str(str, s, len);
rb_str_cat(str, "/", 1);
if (re) {
if (FL_TEST(re, REG_IGNORECASE))
rb_str_cat(str, "i", 1);
if (FL_TEST(re, KCODE_FIXED)) {
switch ((RBASIC(re)->flags & KCODE_MASK)) {
case KCODE_NONE:
rb_str_cat(str, "n", 1);
break;
case KCODE_EUC:
rb_str_cat(str, "e", 1);
break;
case KCODE_SJIS:
rb_str_cat(str, "s", 1);
break;
case KCODE_UTF8:
rb_str_cat(str, "u", 1);
break;
}
}
}
return str;
}
static VALUE
rb_reg_source(re)
VALUE re;
{
VALUE str = rb_str_new(0,0);
rb_reg_expr_str(str, RREGEXP(re)->str,RREGEXP(re)->len);
return str;
}
static VALUE
rb_reg_inspect(re)
VALUE re;
{
return rb_reg_desc(RREGEXP(re)->str, RREGEXP(re)->len, re);
}
static void
rb_reg_raise(s, len, err, re)
char *s;
int len;
char *err;
VALUE re;
{
VALUE desc = rb_reg_desc(s, len, re);
if (ruby_in_compile)
rb_compile_error("%s: %s", err, RSTRING(desc)->ptr);
else
rb_raise(rb_eRegxpError, "%s: %s", err, RSTRING(desc)->ptr);
}
static VALUE
rb_reg_casefold_p(re)
VALUE re;
{
if (FL_TEST(re, REG_IGNORECASE)) return Qtrue;
return Qfalse;
}
static VALUE
rb_reg_kcode_method(re)
VALUE re;
{
char *kcode = "$KCODE";
if (FL_TEST(re, KCODE_FIXED)) {
switch (RBASIC(re)->flags & KCODE_MASK) {
case KCODE_NONE:
kcode = "none"; break;
case KCODE_EUC:
kcode = "euc"; break;
case KCODE_SJIS:
kcode = "sjis"; break;
case KCODE_UTF8:
kcode = "utf8"; break;
default:
break;
}
}
return rb_str_new2(kcode);
}
static Regexp*
make_regexp(s, len, flag)
char *s;
int len, flag;
{
Regexp *rp;
char *err;
/* Handle escaped characters first. */
/* Build a copy of the string (in dest) with the
escaped characters translated, and generate the regex
from that.
*/
rp = ALLOC(Regexp);
MEMZERO((char *)rp, Regexp, 1);
rp->buffer = ALLOC_N(char, 16);
rp->allocated = 16;
rp->fastmap = ALLOC_N(char, 256);
if (flag) {
rp->options = flag;
}
err = re_compile_pattern(s, len, rp);
if (err != NULL) {
rb_reg_raise(s, len, err, 0);
}
return rp;
}
static VALUE rb_cMatch;
static VALUE
match_alloc()
{
NEWOBJ(match, struct RMatch);
OBJSETUP(match, rb_cMatch, T_MATCH);
match->str = 0;
match->regs = 0;
match->regs = ALLOC(struct re_registers);
MEMZERO(match->regs, struct re_registers, 1);
return (VALUE)match;
}
static VALUE
match_clone(orig)
VALUE orig;
{
NEWOBJ(match, struct RMatch);
OBJSETUP(match, rb_cMatch, T_MATCH);
match->str = RMATCH(orig)->str;
match->regs = 0;
match->regs = ALLOC(struct re_registers);
match->regs->allocated = 0;
re_copy_registers(match->regs, RMATCH(orig)->regs);
CLONESETUP(match, orig);
return (VALUE)match;
}
int ruby_ignorecase;
static int may_need_recompile;
static VALUE matchcache;
static void
rb_reg_prepare_re(reg)
VALUE reg;
{
int need_recompile = 0;
/* case-flag not set for the object */
if (!FL_TEST(reg, REG_IGNORECASE)) {
int state = FL_TEST(reg, REG_CASESTATE);
if ((ruby_ignorecase || state) && !(ruby_ignorecase && state)) {
RBASIC(reg)->flags ^= REG_CASESTATE;
need_recompile = 1;
}
}
if (!FL_TEST(reg, KCODE_FIXED) &&
(RBASIC(reg)->flags & KCODE_MASK) != reg_kcode) {
need_recompile = 1;
RBASIC(reg)->flags &= ~KCODE_MASK;
RBASIC(reg)->flags |= reg_kcode;
}
if (need_recompile) {
char *err;
if (FL_TEST(reg, KCODE_FIXED))
kcode_set_option(reg);
RREGEXP(reg)->ptr->fastmap_accurate = 0;
err = re_compile_pattern(RREGEXP(reg)->str, RREGEXP(reg)->len, RREGEXP(reg)->ptr);
if (err != NULL) {
rb_reg_raise(RREGEXP(reg)->str, RREGEXP(reg)->len, err, reg);
}
}
}
int
rb_reg_search(reg, str, start, reverse)
VALUE reg, str;
int start, reverse;
{
int result;
VALUE match;
struct re_registers *regs = 0;
int range;
if (start > RSTRING(str)->len) return -1;
if (may_need_recompile)
rb_reg_prepare_re(reg);
if (FL_TEST(reg, KCODE_FIXED))
kcode_set_option(reg);
else if (reg_kcode != curr_kcode)
kcode_reset_option();
#ifdef USE_THREAD
if (rb_thread_scope_shared_p()) {
match = Qnil;
}
else {
match = rb_backref_get();
}
#else
match = rb_backref_get();
#endif
if (NIL_P(match)) {
if (matchcache) {
match = matchcache;
matchcache = 0;
}
else {
match = match_alloc();
}
}
regs = RMATCH(match)->regs;
if (reverse) {
range = -start;
}
else {
range = RSTRING(str)->len - start;
}
result = re_search(RREGEXP(reg)->ptr,RSTRING(str)->ptr,RSTRING(str)->len,
start, range, regs);
if (result == -2) {
rb_reg_raise(RREGEXP(reg)->str, RREGEXP(reg)->len,
"Stack overfow in regexp matcher", reg);
}
if (result < 0) {
matchcache = match;
rb_backref_set(Qnil);
}
else {
RMATCH(match)->str = rb_str_new4(str);
rb_backref_set(match);
}
return result;
}
VALUE
rb_reg_nth_defined(nth, match)
int nth;
VALUE match;
{
if (NIL_P(match)) return Qnil;
if (nth >= RMATCH(match)->regs->num_regs) {
return Qfalse;
}
if (RMATCH(match)->BEG(nth) == -1) return Qfalse;
return Qtrue;
}
VALUE
rb_reg_nth_match(nth, match)
int nth;
VALUE match;
{
int start, end, len;
if (NIL_P(match)) return Qnil;
if (nth >= RMATCH(match)->regs->num_regs) {
return Qnil;
}
start = RMATCH(match)->BEG(nth);
if (start == -1) return Qnil;
end = RMATCH(match)->END(nth);
len = end - start;
return rb_str_new(RSTRING(RMATCH(match)->str)->ptr + start, len);
}
VALUE
rb_reg_last_match(match)
VALUE match;
{
return rb_reg_nth_match(0, match);
}
VALUE
rb_reg_match_pre(match)
VALUE match;
{
if (NIL_P(match)) return Qnil;
if (RMATCH(match)->BEG(0) == -1) return Qnil;
return rb_str_new(RSTRING(RMATCH(match)->str)->ptr, RMATCH(match)->BEG(0));
}
VALUE
rb_reg_match_post(match)
VALUE match;
{
if (NIL_P(match)) return Qnil;
if (RMATCH(match)->BEG(0) == -1) return Qnil;
return rb_str_new(RSTRING(RMATCH(match)->str)->ptr+RMATCH(match)->END(0),
RSTRING(RMATCH(match)->str)->len-RMATCH(match)->END(0));
}
VALUE
rb_reg_match_last(match)
VALUE match;
{
int i;
if (NIL_P(match)) return Qnil;
if (RMATCH(match)->BEG(0) == -1) return Qnil;
for (i=RMATCH(match)->regs->num_regs-1; RMATCH(match)->BEG(i) == -1 && i > 0; i--)
;
if (i == 0) return Qnil;
return rb_reg_nth_match(i, match);
}
static VALUE
last_match_getter()
{
return rb_reg_last_match(rb_backref_get());
}
static VALUE
prematch_getter()
{
return rb_reg_match_pre(rb_backref_get());
}
static VALUE
postmatch_getter()
{
return rb_reg_match_post(rb_backref_get());
}
static VALUE
last_paren_match_getter()
{
return rb_reg_match_last(rb_backref_get());
}
static VALUE
match_to_a(match)
VALUE match;
{
struct re_registers *regs = RMATCH(match)->regs;
VALUE ary = rb_ary_new2(regs->num_regs);
char *ptr = RSTRING(RMATCH(match)->str)->ptr;
int i;
for (i=0; i<regs->num_regs; i++) {
if (regs->beg[i] == -1) rb_ary_push(ary, Qnil);
else rb_ary_push(ary, rb_str_new(ptr+regs->beg[i],
regs->end[i]-regs->beg[i]));
}
return ary;
}
static VALUE
match_aref(argc, argv, match)
int argc;
VALUE *argv;
VALUE match;
{
VALUE idx, rest;
struct re_registers *regs;
char *ptr;
int i;
rb_scan_args(argc, argv, "11", &idx, &rest);
if (!NIL_P(rest) || !FIXNUM_P(idx) || FIX2INT(idx) < 0) {
return rb_ary_aref(argc, argv, match_to_a(match));
}
regs = RMATCH(match)->regs;
i = FIX2INT(idx);
if (i>=regs->num_regs) return Qnil;
ptr = RSTRING(RMATCH(match)->str)->ptr;
return rb_str_new(ptr+regs->beg[i], regs->end[i]-regs->beg[i]);
}
static VALUE
match_to_s(match)
VALUE match;
{
VALUE str = rb_reg_last_match(match);
if (NIL_P(str)) return rb_str_new(0,0);
return str;
}
VALUE rb_cRegexp;
static VALUE
rb_reg_new_1(klass, s, len, options)
VALUE klass;
char *s;
int len;
int options; /* CASEFOLD = 1 */
/* EXTENDED = 2 */
/* CODE_NONE = 4 */
/* CODE_EUC = 8 */
/* CODE_SJIS = 12 */
/* CODE_UTF8 = 16 */
{
NEWOBJ(re, struct RRegexp);
OBJSETUP(re, klass, T_REGEXP);
re->ptr = 0;
re->str = 0;
if (options & RE_OPTION_IGNORECASE) {
FL_SET(re, REG_IGNORECASE);
}
switch (options & ~0x3) {
case 0:
default:
FL_SET(re, reg_kcode);
break;
case 4:
kcode_none(re);
break;
case 8:
kcode_euc(re);
break;
case 12:
kcode_sjis(re);
break;
case 16:
kcode_utf8(re);
break;
}
if (options & ~0x3) {
kcode_set_option((VALUE)re);
}
if (ruby_ignorecase) {
options |= RE_OPTION_IGNORECASE;
FL_SET(re, REG_CASESTATE);
}
re->ptr = make_regexp(s, len, options & 0x3);
re->str = ALLOC_N(char, len+1);
memcpy(re->str, s, len);
re->str[len] = '\0';
re->len = len;
if (options & ~0x3) {
kcode_reset_option();
}
rb_obj_call_init((VALUE)re);
return (VALUE)re;
}
VALUE
rb_reg_new(s, len, options)
char *s;
int len;
int options;
{
return rb_reg_new_1(rb_cRegexp, s, len, options);
}
static int case_cache;
static int kcode_cache;
static VALUE reg_cache;
VALUE
rb_reg_regcomp(str)
VALUE str;
{
if (reg_cache && RREGEXP(reg_cache)->len == RSTRING(str)->len
&& case_cache == ruby_ignorecase
&& kcode_cache == reg_kcode
&& memcmp(RREGEXP(reg_cache)->str, RSTRING(str)->ptr, RSTRING(str)->len) == 0)
return reg_cache;
case_cache = ruby_ignorecase;
kcode_cache = reg_kcode;
return reg_cache = rb_reg_new(RSTRING(str)->ptr, RSTRING(str)->len,
ruby_ignorecase);
}
static int
rb_reg_cur_kcode(re)
VALUE re;
{
if (FL_TEST(re, KCODE_FIXED)) {
return RBASIC(re)->flags & KCODE_MASK;
}
return 0;
}
static VALUE
rb_reg_equal(re1, re2)
VALUE re1, re2;
{
int min;
if (re1 == re2) return Qtrue;
if (TYPE(re2) != T_REGEXP) return Qfalse;
if (RREGEXP(re1)->len != RREGEXP(re2)->len) return Qfalse;
min = RREGEXP(re1)->len;
if (min > RREGEXP(re2)->len) min = RREGEXP(re2)->len;
if (memcmp(RREGEXP(re1)->str, RREGEXP(re2)->str, min) == 0 &&
rb_reg_cur_kcode(re1) == rb_reg_cur_kcode(re2) &&
!(FL_TEST(re1,REG_IGNORECASE) ^ FL_TEST(re2,REG_IGNORECASE))) {
return Qtrue;
}
return Qfalse;
}
VALUE
rb_reg_match(re, str)
VALUE re, str;
{
int start;
if (NIL_P(str)) return Qnil;
str = rb_str_to_str(str);
start = rb_reg_search(re, str, 0, 0);
if (start < 0) {
return Qnil;
}
return INT2FIX(start);
}
VALUE
rb_reg_match2(re)
VALUE re;
{
int start;
VALUE line = rb_lastline_get();
if (TYPE(line) != T_STRING)
return Qnil;
start = rb_reg_search(re, line, 0, 0);
if (start < 0) {
return Qnil;
}
return INT2FIX(start);
}
static VALUE
rb_reg_s_new(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
VALUE src;
int flag = 0;
if (argc == 0 || argc > 3) {
rb_raise(rb_eArgError, "wrong # of argument");
}
if (argc >= 2 && RTEST(argv[1])) {
flag = RE_OPTION_IGNORECASE;
}
if (argc == 3) {
char *kcode = STR2CSTR(argv[2]);
switch (kcode[0]) {
case 'n': case 'N':
flag |= 4;
break;
case 'e': case 'E':
flag |= 8;
break;
case 's': case 'S':
flag |= 12;
break;
default:
break;
}
}
src = argv[0];
if (TYPE(src) == T_REGEXP) {
return rb_reg_new_1(self, RREGEXP(src)->str, RREGEXP(src)->len, flag);
}
else {
char *p;
int len;
p = str2cstr(src, &len);
return rb_reg_new_1(self, p, len, flag);
}
}
static VALUE
rb_reg_s_quote(re, str)
VALUE re, str;
{
char *s, *send, *t;
char *tmp;
int len;
s = str2cstr(str, &len);
send = s + len;
tmp = ALLOCA_N(char, len*2);
t = tmp;
for (; s != send; s++) {
if (ismbchar(*s)) {
*t++ = *s++;
*t++ = *s;
continue;
}
if (*s == '[' || *s == ']'
|| *s == '{' || *s == '}'
|| *s == '(' || *s == ')'
|| *s == '|'
|| *s == '*' || *s == '.' || *s == '\\'
|| *s == '?' || *s == '+'
|| *s == '^' || *s == '$') {
*t++ = '\\';
}
*t++ = *s;
}
return rb_str_new(tmp, t - tmp);
}
int
rb_kcode()
{
switch (reg_kcode) {
case KCODE_EUC:
return MBCTYPE_EUC;
case KCODE_SJIS:
return MBCTYPE_SJIS;
case KCODE_NONE:
return MBCTYPE_ASCII;
}
rb_bug("wrong reg_kcode value (0x%x)", reg_kcode);
}
static int
rb_reg_get_kcode(re)
VALUE re;
{
int kcode = 0;
switch (RBASIC(re)->flags & KCODE_MASK) {
case KCODE_NONE:
kcode |= 4; break;
case KCODE_EUC:
kcode |= 8; break;
case KCODE_SJIS:
kcode |= 12; break;
default:
break;
}
return kcode;
}
int
rb_reg_options(re)
VALUE re;
{
int options = 0;
if (FL_TEST(re, REG_IGNORECASE))
options |= RE_OPTION_IGNORECASE;
if (FL_TEST(re, KCODE_FIXED)) {
options |= rb_reg_get_kcode(re);
}
return options;
}
static VALUE
rb_reg_clone(orig)
VALUE orig;
{
VALUE reg;
reg = rb_reg_new_1(CLASS_OF(orig), RREGEXP(orig)->str, RREGEXP(orig)->len,
rb_reg_options(orig));
CLONESETUP(reg, orig);
return reg;
}
VALUE
rb_reg_regsub(str, src, regs)
VALUE str, src;
struct re_registers *regs;
{
VALUE val = 0;
char *p, *s, *e, c;
int no;
p = s = RSTRING(str)->ptr;
e = s + RSTRING(str)->len;
while (s < e) {
char *ss = s;
c = *s++;
if (ismbchar(c)) {
s++;
continue;
}
if (c != '\\' || s == e) continue;
if (!val) val = rb_str_new(p, ss-p);
else rb_str_cat(val, p, ss-p);
c = *s++;
p = s;
switch (c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
no = c - '0';
break;
case '&':
no = 0;
break;
case '`':
rb_str_cat(val, RSTRING(src)->ptr, BEG(0));
continue;
case '\'':
rb_str_cat(val, RSTRING(src)->ptr+END(0), RSTRING(src)->len-END(0));
continue;
case '+':
no = regs->num_regs-1;
while (BEG(no) == -1 && no > 0) no--;
if (no == 0) continue;
break;
case '\\':
rb_str_cat(val, s-1, 1);
continue;
default:
rb_str_cat(val, s-2, 2);
continue;
}
if (no >= 0) {