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ruby--ruby/re.c
matz e2b92403d5 * re.c (rb_reg_initialize_m): 3rd argument was ignored. 
* string.c (rb_str_count): return 0 for empty string (was
  returning nil).


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3449 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2003-02-06 08:25:12 +00:00

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/**********************************************************************
re.c -
$Author$
created at: Mon Aug 9 18:24:49 JST 1993
Copyright (C) 1993-2003 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include "re.h"
#include <ctype.h>
static VALUE rb_eRegexpError;
#define BEG(no) regs->beg[no]
#define END(no) regs->end[no]
#if 'a' == 97 /* it's ascii */
static const 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
# error >>> "You lose. You will need a translation table for your character set." <<<
#endif
#define MIN(a,b) (((a)>(b))?(b):(a))
int
rb_memcicmp(p1, p2, len)
char *p1, *p2;
long len;
{
int tmp;
while (len--) {
if (tmp = casetable[(unsigned)*p1++] - casetable[(unsigned)*p2++])
return tmp;
}
return 0;
}
int
rb_memcmp(p1, p2, len)
char *p1, *p2;
long len;
{
if (!ruby_ignorecase) {
return memcmp(p1, p2, len);
}
return rb_memcicmp(p1, p2, len);
}
int
rb_memsearch(x0, m, y0, n)
char *x0, *y0;
long m, n;
{
unsigned char *x = x0, *y = y0;
unsigned char *s, *e;
long i;
int d;
unsigned long hx, hy;
#define KR_REHASH(a, b, h) (((h) << 1) - ((a)<<d) + (b))
s = y; e = s + n - m + 1;
/* Preprocessing */
/* computes d = 2^(m-1) with
the left-shift operator */
d = sizeof(hx) * CHAR_BIT - 1;
if (d > m) d = m;
if (ruby_ignorecase) {
/* Prepare hash value */
for (hy = hx = i = 0; i < d; ++i) {
hx = KR_REHASH(0, casetable[x[i]], hx);
hy = KR_REHASH(0, casetable[s[i]], hy);
}
/* Searching */
while (s < e) {
if (hx == hy && rb_memcicmp(x, s, m) == 0) {
return s-y;
}
hy = KR_REHASH(casetable[*s], casetable[*(s+d)], hy);
s++;
}
}
else {
/* Prepare hash value */
for (hy = hx = i = 0; i < d; ++i) {
hx = KR_REHASH(0, x[i], hx);
hy = KR_REHASH(0, s[i], hy);
}
/* Searching */
while (s < e) {
if (hx == hy && memcmp(x, s, m) == 0) {
return s-y;
}
hy = KR_REHASH(*s, *(s+d), hy);
s++;
}
}
return -1;
}
#define REG_CASESTATE FL_USER0
#define KCODE_NONE 0
#define KCODE_EUC FL_USER1
#define KCODE_SJIS FL_USER2
#define KCODE_UTF8 FL_USER3
#define KCODE_FIXED FL_USER4
#define KCODE_MASK (KCODE_EUC|KCODE_SJIS|KCODE_UTF8)
static int reg_kcode = DEFAULT_KCODE;
static void
kcode_euc(re)
struct RRegexp *re;
{
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_EUC);
FL_SET(re, KCODE_FIXED);
}
static void
kcode_sjis(re)
struct RRegexp *re;
{
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_SJIS);
FL_SET(re, KCODE_FIXED);
}
static void
kcode_utf8(re)
struct RRegexp *re;
{
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_UTF8);
FL_SET(re, KCODE_FIXED);
}
static void
kcode_none(re)
struct RRegexp *re;
{
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_FIXED);
}
static int curr_kcode;
static void
kcode_set_option(re)
VALUE re;
{
if (!FL_TEST(re, KCODE_FIXED)) return;
curr_kcode = RBASIC(re)->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;
}
}
int
rb_reg_mbclen2(c, re)
unsigned int c;
VALUE re;
{
int len;
if (!FL_TEST(re, KCODE_FIXED))
return mbclen(c);
kcode_set_option(re);
len = mbclen(c);
kcode_reset_option();
return len;
}
static void
rb_reg_check(re)
VALUE re;
{
if (!RREGEXP(re)->ptr || !RREGEXP(re)->str) {
rb_raise(rb_eTypeError, "uninitialized Regexp");
}
}
extern int ruby_in_compile;
static void
rb_reg_expr_str(str, s, len)
VALUE str;
const char *s;
long len;
{
const char *p, *pend;
int need_escape = 0;
p = s; pend = p + len;
while (p<pend) {
if (*p == '/' || (!ISPRINT(*p) && !ismbchar(*p))) {
need_escape = 1;
break;
}
p += mbclen(*p);
}
if (!need_escape) {
rb_str_buf_cat(str, s, len);
}
else {
p = s;
while (p<pend) {
if (*p == '\\') {
int n = mbclen(p[1]) + 1;
rb_str_buf_cat(str, p, n);
p += n;
continue;
}
else if (*p == '/') {
char c = '\\';
rb_str_buf_cat(str, &c, 1);
rb_str_buf_cat(str, p, 1);
}
else if (ismbchar(*p)) {
rb_str_buf_cat(str, p, mbclen(*p));
p += mbclen(*p);
continue;
}
else if (ISPRINT(*p)) {
rb_str_buf_cat(str, p, 1);
}
else if (!ISSPACE(*p)) {
char b[8];
sprintf(b, "\\%03o", *p & 0377);
rb_str_buf_cat(str, b, 4);
}
else {
rb_str_buf_cat(str, p, 1);
}
p++;
}
}
}
static VALUE
rb_reg_desc(s, len, re)
const char *s;
long len;
VALUE re;
{
VALUE str = rb_str_buf_new2("/");
rb_reg_expr_str(str, s, len);
rb_str_buf_cat2(str, "/");
if (re) {
rb_reg_check(re);
if (RREGEXP(re)->ptr->options & RE_OPTION_MULTILINE)
rb_str_buf_cat2(str, "m");
if (RREGEXP(re)->ptr->options & RE_OPTION_IGNORECASE)
rb_str_buf_cat2(str, "i");
if (RREGEXP(re)->ptr->options & RE_OPTION_EXTENDED)
rb_str_buf_cat2(str, "x");
if (FL_TEST(re, KCODE_FIXED)) {
switch ((RBASIC(re)->flags & KCODE_MASK)) {
case KCODE_NONE:
rb_str_buf_cat2(str, "n");
break;
case KCODE_EUC:
rb_str_buf_cat2(str, "e");
break;
case KCODE_SJIS:
rb_str_buf_cat2(str, "s");
break;
case KCODE_UTF8:
rb_str_buf_cat2(str, "u");
break;
}
}
}
OBJ_INFECT(str, re);
return str;
}
static VALUE
rb_reg_source(re)
VALUE re;
{
VALUE str;
rb_reg_check(re);
str = rb_str_new(RREGEXP(re)->str,RREGEXP(re)->len);
if (OBJ_TAINTED(re)) OBJ_TAINT(str);
return str;
}
static VALUE
rb_reg_inspect(re)
VALUE re;
{
rb_reg_check(re);
return rb_reg_desc(RREGEXP(re)->str, RREGEXP(re)->len, re);
}
static VALUE
rb_reg_to_s(re)
VALUE re;
{
int options;
const int embeddable = RE_OPTION_MULTILINE|RE_OPTION_IGNORECASE|RE_OPTION_EXTENDED;
long len;
const char* ptr;
VALUE str = rb_str_buf_new2("(?");
rb_reg_check(re);
options = RREGEXP(re)->ptr->options;
ptr = RREGEXP(re)->str;
len = RREGEXP(re)->len;
again:
if (len >= 4 && ptr[0] == '(' && ptr[1] == '?') {
int err = 1;
ptr += 2;
if ((len -= 2) > 0) {
do {
if (*ptr == 'm') {
options |= RE_OPTION_MULTILINE;
}
else if (*ptr == 'i') {
options |= RE_OPTION_IGNORECASE;
}
else if (*ptr == 'x') {
options |= RE_OPTION_EXTENDED;
}
else break;
++ptr;
} while (--len > 0);
}
if (len > 1 && *ptr == '-') {
++ptr;
--len;
do {
if (*ptr == 'm') {
options &= ~RE_OPTION_MULTILINE;
}
else if (*ptr == 'i') {
options &= ~RE_OPTION_IGNORECASE;
}
else if (*ptr == 'x') {
options &= ~RE_OPTION_EXTENDED;
}
else break;
++ptr;
} while (--len > 0);
}
if (*ptr == ')') {
--len;
++ptr;
goto again;
}
if (*ptr == ':' && ptr[len-1] == ')') {
Regexp *rp;
kcode_set_option(re);
rp = ALLOC(Regexp);
MEMZERO((char *)rp, Regexp, 1);
err = re_compile_pattern(++ptr, len -= 2, rp) != 0;
kcode_reset_option();
re_free_pattern(rp);
}
if (err) {
options = RREGEXP(re)->ptr->options;
ptr = RREGEXP(re)->str;
len = RREGEXP(re)->len;
}
}
if (options & RE_OPTION_MULTILINE) rb_str_buf_cat2(str, "m");
if (options & RE_OPTION_IGNORECASE) rb_str_buf_cat2(str, "i");
if (options & RE_OPTION_EXTENDED) rb_str_buf_cat2(str, "x");
if ((options & embeddable) != embeddable) {
rb_str_buf_cat2(str, "-");
if (!(options & RE_OPTION_MULTILINE)) rb_str_buf_cat2(str, "m");
if (!(options & RE_OPTION_IGNORECASE)) rb_str_buf_cat2(str, "i");
if (!(options & RE_OPTION_EXTENDED)) rb_str_buf_cat2(str, "x");
}
rb_str_buf_cat2(str, ":");
rb_reg_expr_str(str, ptr, len);
rb_str_buf_cat2(str, ")");
OBJ_INFECT(str, re);
return str;
}
static void
rb_reg_raise(s, len, err, re)
const char *s;
long len;
const 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_eRegexpError, "%s: %s", err, RSTRING(desc)->ptr);
}
static VALUE
rb_reg_casefold_p(re)
VALUE re;
{
rb_reg_check(re);
if (RREGEXP(re)->ptr->options & RE_OPTION_IGNORECASE) return Qtrue;
return Qfalse;
}
static VALUE
rb_reg_options_m(re)
VALUE re;
{
rb_reg_check(re);
return INT2NUM(RREGEXP(re)->ptr->options);
}
static VALUE
rb_reg_kcode_m(re)
VALUE re;
{
char *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:
rb_bug("unknown kcode - should not happen");
break;
}
return rb_str_new2(kcode);
}
return Qnil;
}
static Regexp*
make_regexp(s, len, flags)
const char *s;
long len;
int flags;
{
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 (flags) {
rp->options = flags;
}
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 _((VALUE));
static VALUE
match_alloc(klass)
VALUE klass;
{
NEWOBJ(match, struct RMatch);
OBJSETUP(match, klass, 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_copy_object(obj, orig)
VALUE obj, orig;
{
if (obj == orig) return obj;
if (!rb_obj_is_instance_of(orig, rb_obj_class(obj))) {
rb_raise(rb_eTypeError, "wrong argument class");
}
RMATCH(obj)->str = RMATCH(orig)->str;
re_free_registers(RMATCH(obj)->regs);
RMATCH(obj)->regs->allocated = 0;
re_copy_registers(RMATCH(obj)->regs, RMATCH(orig)->regs);
return obj;
}
static VALUE
match_size(match)
VALUE match;
{
return INT2FIX(RMATCH(match)->regs->num_regs);
}
static VALUE
match_offset(match, n)
VALUE match, n;
{
int i = NUM2INT(n);
if (i < 0 || RMATCH(match)->regs->num_regs <= i)
rb_raise(rb_eIndexError, "index %d out of matches", i);
if (RMATCH(match)->regs->beg[i] < 0)
return rb_assoc_new(Qnil, Qnil);
return rb_assoc_new(INT2FIX(RMATCH(match)->regs->beg[i]),
INT2FIX(RMATCH(match)->regs->end[i]));
}
static VALUE
match_begin(match, n)
VALUE match, n;
{
int i = NUM2INT(n);
if (i < 0 || RMATCH(match)->regs->num_regs <= i)
rb_raise(rb_eIndexError, "index %d out of matches", i);
if (RMATCH(match)->regs->beg[i] < 0)
return Qnil;
return INT2FIX(RMATCH(match)->regs->beg[i]);
}
static VALUE
match_end(match, n)
VALUE match, n;
{
int i = NUM2INT(n);
if (i < 0 || RMATCH(match)->regs->num_regs <= i)
rb_raise(rb_eIndexError, "index %d out of matches", i);
if (RMATCH(match)->regs->beg[i] < 0)
return Qnil;
return INT2FIX(RMATCH(match)->regs->end[i]);
}
#define MATCH_BUSY FL_USER2
void
rb_match_busy(match)
VALUE match;
{
FL_SET(match, MATCH_BUSY);
}
int ruby_ignorecase;
static int may_need_recompile;
static void
rb_reg_prepare_re(re)
VALUE re;
{
int need_recompile = 0;
int state;
rb_reg_check(re);
state = FL_TEST(re, REG_CASESTATE);
/* ignorecase status */
if (ruby_ignorecase && !state) {
FL_SET(re, REG_CASESTATE);
RREGEXP(re)->ptr->options |= RE_OPTION_IGNORECASE;
need_recompile = 1;
}
if (!ruby_ignorecase && state) {
FL_UNSET(re, REG_CASESTATE);
RREGEXP(re)->ptr->options &= ~RE_OPTION_IGNORECASE;
need_recompile = 1;
}
if (!FL_TEST(re, KCODE_FIXED) &&
(RBASIC(re)->flags & KCODE_MASK) != reg_kcode) {
need_recompile = 1;
RBASIC(re)->flags &= ~KCODE_MASK;
RBASIC(re)->flags |= reg_kcode;
}
if (need_recompile) {
char *err;
if (FL_TEST(re, KCODE_FIXED))
kcode_set_option(re);
rb_reg_check(re);
RREGEXP(re)->ptr->fastmap_accurate = 0;
err = re_compile_pattern(RREGEXP(re)->str, RREGEXP(re)->len, RREGEXP(re)->ptr);
if (err != NULL) {
rb_reg_raise(RREGEXP(re)->str, RREGEXP(re)->len, err, re);
}
}
}
long
rb_reg_adjust_startpos(re, str, pos, reverse)
VALUE re, str;
long pos, reverse;
{
long range;
rb_reg_check(re);
if (may_need_recompile) rb_reg_prepare_re(re);
if (FL_TEST(re, KCODE_FIXED))
kcode_set_option(re);
else if (reg_kcode != curr_kcode)
kcode_reset_option();
if (reverse) {
range = -pos;
}
else {
range = RSTRING(str)->len - pos;
}
return re_adjust_startpos(RREGEXP(re)->ptr,
RSTRING(str)->ptr, RSTRING(str)->len,
pos, range);
}
long
rb_reg_search(re, str, pos, reverse)
VALUE re, str;
long pos, reverse;
{
long result;
VALUE match;
static struct re_registers regs;
long range;
if (pos > RSTRING(str)->len || pos < 0) {
rb_backref_set(Qnil);
return -1;
}
rb_reg_check(re);
if (may_need_recompile) rb_reg_prepare_re(re);
if (FL_TEST(re, KCODE_FIXED))
kcode_set_option(re);
else if (reg_kcode != curr_kcode)
kcode_reset_option();
if (reverse) {
range = -pos;
}
else {
range = RSTRING(str)->len - pos;
}
result = re_search(RREGEXP(re)->ptr,RSTRING(str)->ptr,RSTRING(str)->len,
pos, range, &regs);
if (FL_TEST(re, KCODE_FIXED))
kcode_reset_option();
if (result == -2) {
rb_reg_raise(RREGEXP(re)->str, RREGEXP(re)->len,
"Stack overflow in regexp matcher", re);
}
if (result < 0) {
rb_backref_set(Qnil);
return result;
}
match = rb_backref_get();
if (NIL_P(match) || FL_TEST(match, MATCH_BUSY)) {
match = match_alloc(rb_cMatch);
}
else {
if (rb_safe_level() >= 3)
OBJ_TAINT(match);
else
FL_UNSET(match, FL_TAINT);
}
re_copy_registers(RMATCH(match)->regs, &regs);
RMATCH(match)->str = rb_str_new4(str);
rb_backref_set(match);
OBJ_INFECT(match, re);
OBJ_INFECT(match, str);
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 Qnil;
}
if (nth < 0) {
nth += RMATCH(match)->regs->num_regs;
if (nth <= 0) return Qnil;
}
if (RMATCH(match)->BEG(nth) == -1) return Qfalse;
return Qtrue;
}
VALUE
rb_reg_nth_match(nth, match)
int nth;
VALUE match;
{
VALUE str;
long start, end, len;
if (NIL_P(match)) return Qnil;
if (nth >= RMATCH(match)->regs->num_regs) {
return Qnil;
}
if (nth < 0) {
nth += RMATCH(match)->regs->num_regs;
if (nth <= 0) return Qnil;
}
start = RMATCH(match)->BEG(nth);
if (start == -1) return Qnil;
end = RMATCH(match)->END(nth);
len = end - start;
str = rb_str_substr(RMATCH(match)->str, start, len);
OBJ_INFECT(str, match);
return str;
}
VALUE
rb_reg_last_match(match)
VALUE match;
{
return rb_reg_nth_match(0, match);
}
VALUE
rb_reg_match_pre(match)
VALUE match;
{
VALUE str;
if (NIL_P(match)) return Qnil;
if (RMATCH(match)->BEG(0) == -1) return Qnil;
str = rb_str_substr(RMATCH(match)->str, 0, RMATCH(match)->BEG(0));
if (OBJ_TAINTED(match)) OBJ_TAINT(str);
return str;
}
VALUE
rb_reg_match_post(match)
VALUE match;
{
VALUE str;
long pos;
if (NIL_P(match)) return Qnil;
if (RMATCH(match)->BEG(0) == -1) return Qnil;
str = RMATCH(match)->str;
pos = RMATCH(match)->END(0);
str = rb_str_substr(str, pos, RSTRING(str)->len - pos);
if (OBJ_TAINTED(match)) OBJ_TAINT(str);
return str;
}
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);
VALUE target = RMATCH(match)->str;
int i;
int taint = OBJ_TAINTED(match);
for (i=0; i<regs->num_regs; i++) {
if (regs->beg[i] == -1) {
rb_ary_push(ary, Qnil);
}
else {
VALUE str = rb_str_substr(target, regs->beg[i], regs->end[i]-regs->beg[i]);
if (taint) OBJ_TAINT(str);
rb_ary_push(ary, str);
}
}
return ary;
}
static VALUE
match_aref(argc, argv, match)
int argc;
VALUE *argv;
VALUE match;
{
VALUE idx, rest;
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));
}
return rb_reg_nth_match(FIX2INT(idx), match);
}
static VALUE
match_select(argc, argv, match)
int argc;
VALUE *argv;
VALUE match;
{
struct re_registers *regs = RMATCH(match)->regs;
VALUE target = RMATCH(match)->str;
VALUE result = rb_ary_new();
int i;
long idx;
int taint = OBJ_TAINTED(match);
for (i=0; i<argc; i++) {
idx = NUM2LONG(argv[i]);
if (idx < 0) idx += regs->num_regs;
if (idx < 0 || regs->num_regs <= idx) {
rb_ary_push(result, Qnil);
}
else {
VALUE str = rb_str_substr(target, regs->beg[idx], regs->end[idx]-regs->beg[idx]);
if (taint) OBJ_TAINT(str);
rb_ary_push(result, str);
}
}
return result;
}
static VALUE
match_to_s(match)
VALUE match;
{
VALUE str = rb_reg_last_match(match);
if (NIL_P(str)) str = rb_str_new(0,0);
if (OBJ_TAINTED(match)) OBJ_TAINT(str);
if (OBJ_TAINTED(RMATCH(match)->str)) OBJ_TAINT(str);
return str;
}
static VALUE
match_string(match)
VALUE match;
{
return RMATCH(match)->str; /* str is frozen */
}
VALUE rb_cRegexp;
static void
rb_reg_initialize(obj, s, len, options)
VALUE obj;
const char *s;
long len;
int options; /* CASEFOLD = 1 */
/* EXTENDED = 2 */
/* MULTILINE = 4 */
/* CODE_NONE = 16 */
/* CODE_EUC = 32 */
/* CODE_SJIS = 48 */
/* CODE_UTF8 = 64 */
{
struct RRegexp *re = RREGEXP(obj);
if (re->ptr) re_free_pattern(re->ptr);
if (re->str) free(re->str);
re->ptr = 0;
re->str = 0;
switch (options & ~0xf) {
case 0:
default:
FL_SET(re, reg_kcode);
break;
case 16:
kcode_none(re);
break;
case 32:
kcode_euc(re);
break;
case 48:
kcode_sjis(re);
break;
case 64:
kcode_utf8(re);
break;
}
if (options & ~0xf) {
kcode_set_option((VALUE)re);
}
if (ruby_ignorecase) {
options |= RE_OPTION_IGNORECASE;
FL_SET(re, REG_CASESTATE);
}
re->ptr = make_regexp(s, len, options & 0xf);
re->str = ALLOC_N(char, len+1);
memcpy(re->str, s, len);
re->str[len] = '\0';
re->len = len;
if (options & ~0xf) {
kcode_reset_option();
}
}
static VALUE rb_reg_s_alloc _((VALUE));
static VALUE
rb_reg_s_alloc(klass)
VALUE klass;
{
NEWOBJ(re, struct RRegexp);
OBJSETUP(re, klass, T_REGEXP);
re->ptr = 0;
re->len = 0;
re->str = 0;
return (VALUE)re;
}
VALUE
rb_reg_new(s, len, options)
const char *s;
long len;
int options;
{
VALUE re = rb_reg_s_alloc(rb_cRegexp);
rb_reg_initialize(re, s, len, options);
return (VALUE)re;
}
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_hash(re)
VALUE re;
{
int hashval, len;
char *p;
rb_reg_check(re);
hashval = RREGEXP(re)->ptr->options;
len = RREGEXP(re)->len;
p = RREGEXP(re)->str;
while (len--) {
hashval = hashval * 33 + *p++;
}
hashval = hashval + (hashval>>5);
return INT2FIX(hashval);
}
static VALUE
rb_reg_equal(re1, re2)
VALUE re1, re2;
{
if (re1 == re2) return Qtrue;
if (TYPE(re2) != T_REGEXP) return Qfalse;
rb_reg_check(re1); rb_reg_check(re2);
if (RREGEXP(re1)->len != RREGEXP(re2)->len) return Qfalse;
if (memcmp(RREGEXP(re1)->str, RREGEXP(re2)->str, RREGEXP(re1)->len) == 0 &&
rb_reg_cur_kcode(re1) == rb_reg_cur_kcode(re2) &&
RREGEXP(re1)->ptr->options == RREGEXP(re2)->ptr->options) {
return Qtrue;
}
return Qfalse;
}
VALUE
rb_reg_match(re, str)
VALUE re, str;
{
long start;
if (NIL_P(str)) {
rb_backref_set(Qnil);
return Qnil;
}
StringValue(str);
start = rb_reg_search(re, str, 0, 0);
if (start < 0) {
return Qnil;
}
return LONG2FIX(start);
}
VALUE
rb_reg_eqq(re, str)
VALUE re, str;
{
long start;
if (TYPE(str) != T_STRING) {
str = rb_check_string_type(str);
if (NIL_P(str)) {
rb_backref_set(Qnil);
return Qfalse;
}
}
StringValue(str);
start = rb_reg_search(re, str, 0, 0);
if (start < 0) {
return Qfalse;
}
return Qtrue;
}
VALUE
rb_reg_match2(re)
VALUE re;
{
long start;
VALUE line = rb_lastline_get();
if (TYPE(line) != T_STRING) {
rb_backref_set(Qnil);
return Qnil;
}
start = rb_reg_search(re, line, 0, 0);
if (start < 0) {
return Qnil;
}
return LONG2FIX(start);
}
static VALUE
rb_reg_match_m(re, str)
VALUE re, str;
{
VALUE result = rb_reg_match(re, str);
if (NIL_P(result)) return Qnil;
result = rb_backref_get();
rb_match_busy(result);
return result;
}
static VALUE
rb_reg_initialize_m(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
const char *s;
long len;
int flags = 0;
rb_check_frozen(self);
if (argc == 0 || argc > 3) {
rb_raise(rb_eArgError, "wrong number of argument");
}
if (TYPE(argv[0]) == T_REGEXP) {
if (argc > 1) {
rb_warn("flags%s ignored", (argc == 3) ? " and encoding": "");
}
rb_reg_check(argv[0]);
flags = RREGEXP(argv[0])->ptr->options & 0xf;
switch (RBASIC(argv[0])->flags & KCODE_MASK) {
case KCODE_NONE:
flags |= 16;
break;
case KCODE_EUC:
flags |= 32;
break;
case KCODE_SJIS:
flags |= 48;
break;
case KCODE_UTF8:
flags |= 64;
break;
default:
break;
}
s = RREGEXP(argv[0])->str;
len = RREGEXP(argv[0])->len;
}
else {
s = StringValuePtr(argv[0]);
len = RSTRING(argv[0])->len;
if (argc >= 2) {
if (FIXNUM_P(argv[1])) flags = FIX2INT(argv[1]);
else if (RTEST(argv[1])) flags = RE_OPTION_IGNORECASE;
}
if (argc == 3) {
char *kcode = StringValuePtr(argv[2]);
switch (kcode[0]) {
case 'n': case 'N':
flags |= 16;
break;
case 'e': case 'E':
flags |= 32;
break;
case 's': case 'S':
flags |= 48;
break;
case 'u': case 'U':
flags |= 64;
break;
default:
break;
}
}
}
rb_reg_initialize(self, s, len, flags);
return self;
}
VALUE
rb_reg_quote(str)
VALUE str;
{
char *s, *send, *t;
VALUE tmp;
int c;
s = RSTRING(str)->ptr;
send = s + RSTRING(str)->len;
for (; s < send; s++) {
c = *s;
if (ismbchar(c)) {
int n = mbclen(c);
while (n-- && s < send)
s++;
s--;
continue;
}
switch (c) {
case '[': case ']': case '{': case '}':
case '(': case ')': case '|': case '-':
case '*': case '.': case '\\':
case '?': case '+': case '^': case '$':
case ' ': case '#':
goto meta_found;
}
}
return str;
meta_found:
tmp = rb_str_new(0, RSTRING(str)->len*2);
t = RSTRING(tmp)->ptr;
/* copy upto metacharacter */
memcpy(t, RSTRING(str)->ptr, s - RSTRING(str)->ptr);
t += s - RSTRING(str)->ptr;
for (; s < send; s++) {
c = *s;
if (ismbchar(c)) {
int n = mbclen(c);
while (n-- && s < send)
*t++ = *s++;
s--;
continue;
}
switch (c) {
case '[': case ']': case '{': case '}':
case '(': case ')': case '|': case '-':
case '*': case '.': case '\\':
case '?': case '+': case '^': case '$':
case ' ': case '#':
*t++ = '\\';
break;
}
*t++ = c;
}
rb_str_resize(tmp, t - RSTRING(tmp)->ptr);
OBJ_INFECT(tmp, str);
return tmp;
}
static VALUE
rb_reg_s_quote(argc, argv)
int argc;
VALUE *argv;
{
VALUE str, kcode;
int kcode_saved = reg_kcode;
rb_scan_args(argc, argv, "11", &str, &kcode);
if (!NIL_P(kcode)) {
rb_set_kcode(StringValuePtr(kcode));
curr_kcode = reg_kcode;
reg_kcode = kcode_saved;
}
StringValue(str);
str = rb_reg_quote(str);
kcode_reset_option();
return str;
}
int
rb_kcode()
{
switch (reg_kcode) {
case KCODE_EUC:
return MBCTYPE_EUC;
case KCODE_SJIS:
return MBCTYPE_SJIS;
case KCODE_UTF8:
return MBCTYPE_UTF8;
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;
{
switch (RBASIC(re)->flags & KCODE_MASK) {
case KCODE_NONE:
return 16;
case KCODE_EUC:
return 32;
case KCODE_SJIS:
return 48;
case KCODE_UTF8:
return 64;
default:
return 0;
}
}
int
rb_reg_options(re)
VALUE re;
{
int options = 0;
rb_reg_check(re);
if (RREGEXP(re)->ptr->options & RE_OPTION_IGNORECASE)
options |= RE_OPTION_IGNORECASE;
if (RREGEXP(re)->ptr->options & RE_OPTION_MULTILINE)
options |= RE_OPTION_MULTILINE;
if (RREGEXP(re)->ptr->options & RE_OPTION_EXTENDED)
options |= RE_OPTION_EXTENDED;
if (FL_TEST(re, KCODE_FIXED)) {
options |= rb_reg_get_kcode(re);
}
return options;
}
static VALUE
rb_reg_copy_object(copy, re)
VALUE copy, re;
{
if (copy == re) return copy;
rb_check_frozen(copy);
/* need better argument type check */
if (!rb_obj_is_instance_of(re, rb_obj_class(copy))) {
rb_raise(rb_eTypeError, "wrong argument type");
}
rb_reg_check(re);
rb_reg_initialize(copy, RREGEXP(re)->str, RREGEXP(re)->len,
rb_reg_options(re));
return copy;
}
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 += mbclen(c) - 1;
continue;
}
if (c != '\\' || s == e) continue;
if (!val) {
val = rb_str_buf_new(ss-p);
rb_str_buf_cat(val, p, ss-p);
}
else {
rb_str_buf_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_buf_cat(val, RSTRING(src)->ptr, BEG(0));
continue;
case '\'':
rb_str_buf_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_buf_cat(val, s-1, 1);
continue;
default:
rb_str_buf_cat(val, s-2, 2);
continue;
}
if (no >= 0) {
if (no >= regs->num_regs) continue;
if (BEG(no) == -1) continue;
rb_str_buf_cat(val, RSTRING(src)->ptr+BEG(no), END(no)-BEG(no));
}
}
if (p < e) {
if (!val) {
val = rb_str_buf_new(e-p);
rb_str_buf_cat(val, p, e-p);
}
else {
rb_str_buf_cat(val, p, e-p);
}
}
if (!val) return str;
return val;
}
const char*
rb_get_kcode()
{
switch (reg_kcode) {
case KCODE_SJIS:
return "SJIS";
case KCODE_EUC:
return "EUC";
case KCODE_UTF8:
return "UTF8";
default:
return "NONE";
}
}
static VALUE
kcode_getter()
{
return rb_str_new2(rb_get_kcode());
}
void
rb_set_kcode(code)
const char *code;
{
if (code == 0) goto set_no_conversion;
switch (code[0]) {
case 'E':
case 'e':
reg_kcode = KCODE_EUC;
re_mbcinit(MBCTYPE_EUC);
break;
case 'S':
case 's':
reg_kcode = KCODE_SJIS;
re_mbcinit(MBCTYPE_SJIS);
break;
case 'U':
case 'u':
reg_kcode = KCODE_UTF8;
re_mbcinit(MBCTYPE_UTF8);
break;
default:
case 'N':
case 'n':
case 'A':
case 'a':
set_no_conversion:
reg_kcode = KCODE_NONE;
re_mbcinit(MBCTYPE_ASCII);
break;
}
}
static void
kcode_setter(val)
VALUE val;
{
may_need_recompile = 1;
rb_set_kcode(StringValuePtr(val));
}
static VALUE
ignorecase_getter()
{
return ruby_ignorecase?Qtrue:Qfalse;
}
static void
ignorecase_setter(val, id)
VALUE val;
ID id;
{
rb_warn("modifying %s is deperecated", rb_id2name(id));
may_need_recompile = 1;
ruby_ignorecase = RTEST(val);
}
static VALUE
match_getter()
{
VALUE match = rb_backref_get();
if (NIL_P(match)) return Qnil;
rb_match_busy(match);
return match;
}
static void
match_setter(val)
VALUE val;
{
if (!NIL_P(val)) {
Check_Type(val, T_MATCH);
}
rb_backref_set(val);
}
static VALUE
rb_reg_s_last_match(argc, argv)
int argc;
VALUE *argv;
{
VALUE nth;
if (rb_scan_args(argc, argv, "01", &nth) == 1) {
return rb_reg_nth_match(NUM2INT(nth), rb_backref_get());
}
return match_getter();
}
void
Init_Regexp()
{
rb_eRegexpError = rb_define_class("RegexpError", rb_eStandardError);
re_set_casetable(casetable);
#if DEFAULT_KCODE == KCODE_EUC
re_mbcinit(MBCTYPE_EUC);
#else
#if DEFAULT_KCODE == KCODE_SJIS
re_mbcinit(MBCTYPE_SJIS);
#else
#if DEFAULT_KCODE == KCODE_UTF8
re_mbcinit(MBCTYPE_UTF8);
#else
re_mbcinit(MBCTYPE_ASCII);
#endif
#endif
#endif
rb_define_virtual_variable("$~", match_getter, match_setter);
rb_define_virtual_variable("$&", last_match_getter, 0);
rb_define_virtual_variable("$`", prematch_getter, 0);
rb_define_virtual_variable("$'", postmatch_getter, 0);
rb_define_virtual_variable("$+", last_paren_match_getter, 0);
rb_define_virtual_variable("$=", ignorecase_getter, ignorecase_setter);
rb_define_virtual_variable("$KCODE", kcode_getter, kcode_setter);
rb_define_virtual_variable("$-K", kcode_getter, kcode_setter);
rb_cRegexp = rb_define_class("Regexp", rb_cObject);
rb_define_alloc_func(rb_cRegexp, rb_reg_s_alloc);
rb_define_singleton_method(rb_cRegexp, "compile", rb_class_new_instance, -1);
rb_define_singleton_method(rb_cRegexp, "quote", rb_reg_s_quote, -1);
rb_define_singleton_method(rb_cRegexp, "escape", rb_reg_s_quote, -1);
rb_define_singleton_method(rb_cRegexp, "last_match", rb_reg_s_last_match, -1);
rb_define_method(rb_cRegexp, "initialize", rb_reg_initialize_m, -1);
rb_define_method(rb_cRegexp, "copy_object", rb_reg_copy_object, 1);
rb_define_method(rb_cRegexp, "hash", rb_reg_hash, 0);
rb_define_method(rb_cRegexp, "eql?", rb_reg_equal, 1);
rb_define_method(rb_cRegexp, "==", rb_reg_equal, 1);
rb_define_method(rb_cRegexp, "=~", rb_reg_match, 1);
rb_define_method(rb_cRegexp, "===", rb_reg_eqq, 1);
rb_define_method(rb_cRegexp, "~", rb_reg_match2, 0);
rb_define_method(rb_cRegexp, "match", rb_reg_match_m, 1);
rb_define_method(rb_cRegexp, "to_s", rb_reg_to_s, 0);
rb_define_method(rb_cRegexp, "inspect", rb_reg_inspect, 0);
rb_define_method(rb_cRegexp, "source", rb_reg_source, 0);
rb_define_method(rb_cRegexp, "casefold?", rb_reg_casefold_p, 0);
rb_define_method(rb_cRegexp, "options", rb_reg_options_m, 0);
rb_define_method(rb_cRegexp, "kcode", rb_reg_kcode_m, 0);
rb_define_const(rb_cRegexp, "IGNORECASE", INT2FIX(RE_OPTION_IGNORECASE));
rb_define_const(rb_cRegexp, "EXTENDED", INT2FIX(RE_OPTION_EXTENDED));
rb_define_const(rb_cRegexp, "MULTILINE", INT2FIX(RE_OPTION_MULTILINE));
rb_global_variable(&reg_cache);
rb_cMatch = rb_define_class("MatchData", rb_cObject);
rb_define_global_const("MatchingData", rb_cMatch);
rb_define_alloc_func(rb_cMatch, match_alloc);
rb_undef_method(CLASS_OF(rb_cMatch), "new");
rb_define_method(rb_cMatch, "copy_object", match_copy_object, 1);
rb_define_method(rb_cMatch, "size", match_size, 0);
rb_define_method(rb_cMatch, "length", match_size, 0);
rb_define_method(rb_cMatch, "offset", match_offset, 1);
rb_define_method(rb_cMatch, "begin", match_begin, 1);
rb_define_method(rb_cMatch, "end", match_end, 1);
rb_define_method(rb_cMatch, "to_a", match_to_a, 0);
rb_define_method(rb_cMatch, "to_ary", match_to_a, 0);
rb_define_method(rb_cMatch, "[]", match_aref, -1);
rb_define_method(rb_cMatch, "select", match_select, -1);
rb_define_method(rb_cMatch, "pre_match", rb_reg_match_pre, 0);
rb_define_method(rb_cMatch, "post_match", rb_reg_match_post, 0);
rb_define_method(rb_cMatch, "to_s", match_to_s, 0);
rb_define_method(rb_cMatch, "inspect", rb_any_to_s, 0);
rb_define_method(rb_cMatch, "string", match_string, 0);
}
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