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ruby/re.c

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/**********************************************************************
re.c -
$Author$
created at: Mon Aug 9 18:24:49 JST 1993
Copyright (C) 1993-2006 Yukihiro Matsumoto
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/re.h"
#include "regint.h"
#include <ctype.h>
#define MBCTYPE_ASCII 0
#define MBCTYPE_EUC 1
#define MBCTYPE_SJIS 2
#define MBCTYPE_UTF8 3
VALUE rb_eRegexpError;
typedef char onig_errmsg_buffer[ONIG_MAX_ERROR_MESSAGE_LEN];
#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
int
rb_memcicmp(const void *x, const void *y, long len)
{
const unsigned char *p1 = x, *p2 = y;
int tmp;
while (len--) {
if ((tmp = casetable[(unsigned)*p1++] - casetable[(unsigned)*p2++]))
return tmp;
}
return 0;
}
int
rb_memcmp(const void *p1, const void *p2, long len)
{
if (!ruby_ignorecase) {
return memcmp(p1, p2, len);
}
return rb_memcicmp(p1, p2, len);
}
long
rb_memsearch(const void *x0, long m, const void *y0, long n)
{
const unsigned char *x = x0, *y = y0;
const unsigned char *s, *e;
long i;
int d;
unsigned long hx, hy;
#define KR_REHASH(a, b, h) (((h) << 1) - (((unsigned long)(a))<<d) + (b))
if (m > n) return -1;
s = y; e = s + n - m;
/* 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) {
if (n == m) {
return rb_memcicmp(x, s, m) == 0 ? 0 : -1;
}
/* 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 (hx != hy || rb_memcicmp(x, s, m)) {
if (s >= e) return -1;
hy = KR_REHASH(casetable[*s], casetable[*(s+d)], hy);
s++;
}
}
else {
if (n == m) {
return memcmp(x, s, m) == 0 ? 0 : -1;
}
/* 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 (hx != hy || memcmp(x, s, m)) {
if (s >= e) return -1;
hy = KR_REHASH(*s, *(s+d), hy);
s++;
}
}
return s-y;
}
#define REG_LITERAL FL_USER5
#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)
#define ARG_REG_OPTION_MASK 0x0f
#define ARG_KCODE_UNIT 16
#define ARG_KCODE_NONE (ARG_KCODE_UNIT * 1)
#define ARG_KCODE_EUC (ARG_KCODE_UNIT * 2)
#define ARG_KCODE_SJIS (ARG_KCODE_UNIT * 3)
#define ARG_KCODE_UTF8 (ARG_KCODE_UNIT * 4)
#define ARG_KCODE_MASK (ARG_KCODE_UNIT * 7)
static int reg_kcode = DEFAULT_KCODE;
static int
char_to_option(int c)
{
int val;
switch (c) {
case 'i':
val = ONIG_OPTION_IGNORECASE;
break;
case 'x':
val = ONIG_OPTION_EXTEND;
break;
case 'm':
val = ONIG_OPTION_MULTILINE;
break;
default:
val = 0;
break;
}
return val;
}
static char *
option_to_str(char str[4], int options)
{
char *p = str;
if (options & ONIG_OPTION_MULTILINE) *p++ = 'm';
if (options & ONIG_OPTION_IGNORECASE) *p++ = 'i';
if (options & ONIG_OPTION_EXTEND) *p++ = 'x';
*p = 0;
return str;
}
static const char *
arg_kcode(int options)
{
switch (options & ARG_KCODE_MASK) {
case ARG_KCODE_NONE: return "n";
case ARG_KCODE_EUC: return "e";
case ARG_KCODE_SJIS: return "s";
case ARG_KCODE_UTF8: return "u";
}
return "";
}
static const char *
opt_kcode(int flags)
{
switch (flags) {
case KCODE_NONE: return "n";
case KCODE_EUC: return "e";
case KCODE_SJIS: return "s";
case KCODE_UTF8: return "u";
}
return "";
}
extern int
rb_char_to_option_kcode(int c, int *option, int *kcode)
{
*option = 0;
switch (c) {
case 'n':
*kcode = ARG_KCODE_NONE;
break;
case 'e':
*kcode = ARG_KCODE_EUC;
break;
case 's':
*kcode = ARG_KCODE_SJIS;
break;
case 'u':
*kcode = ARG_KCODE_UTF8;
break;
default:
*kcode = 0;
*option = char_to_option(c);
break;
}
return ((*kcode == 0 && *option == 0) ? 0 : 1);
}
static int
char_to_arg_kcode(int c)
{
int kcode, option;
if (ISUPPER(c)) c = tolower(c);
(void )rb_char_to_option_kcode(c, &option, &kcode);
return kcode;
}
static int
kcode_to_arg_value(unsigned int kcode)
{
switch (kcode & KCODE_MASK) {
case KCODE_NONE:
return ARG_KCODE_NONE;
case KCODE_EUC:
return ARG_KCODE_EUC;
case KCODE_SJIS:
return ARG_KCODE_SJIS;
case KCODE_UTF8:
return ARG_KCODE_UTF8;
default:
return 0;
}
}
static void
set_re_kcode_by_option(struct RRegexp *re, int options)
{
switch (options & ARG_KCODE_MASK) {
case ARG_KCODE_NONE:
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_FIXED);
break;
case ARG_KCODE_EUC:
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_EUC);
FL_SET(re, KCODE_FIXED);
break;
case ARG_KCODE_SJIS:
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_SJIS);
FL_SET(re, KCODE_FIXED);
break;
case ARG_KCODE_UTF8:
FL_UNSET(re, KCODE_MASK);
FL_SET(re, KCODE_UTF8);
FL_SET(re, KCODE_FIXED);
break;
case 0:
default:
FL_SET(re, reg_kcode);
break;
}
}
static int
re_to_kcode_arg_value(VALUE re)
{
return kcode_to_arg_value(RBASIC(re)->flags);
}
static int curr_kcode;
static void
kcode_set_option(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:
onigenc_set_default_encoding(ONIG_ENCODING_ASCII);
break;
case KCODE_EUC:
onigenc_set_default_encoding(ONIG_ENCODING_EUC_JP);
break;
case KCODE_SJIS:
onigenc_set_default_encoding(ONIG_ENCODING_SJIS);
break;
case KCODE_UTF8:
onigenc_set_default_encoding(ONIG_ENCODING_UTF8);
break;
}
}
static void
kcode_reset_option(void)
{
if (reg_kcode == curr_kcode) return;
switch (reg_kcode) {
case KCODE_NONE:
onigenc_set_default_encoding(ONIG_ENCODING_ASCII);
break;
case KCODE_EUC:
onigenc_set_default_encoding(ONIG_ENCODING_EUC_JP);
break;
case KCODE_SJIS:
onigenc_set_default_encoding(ONIG_ENCODING_SJIS);
break;
case KCODE_UTF8:
onigenc_set_default_encoding(ONIG_ENCODING_UTF8);
break;
}
}
int
rb_reg_mbclen2(unsigned int c, VALUE re)
{
int len;
unsigned char uc = (unsigned char)c;
if (!FL_TEST(re, KCODE_FIXED))
return mbclen(uc);
kcode_set_option(re);
len = mbclen(uc);
kcode_reset_option();
return len;
}
static void
rb_reg_check(VALUE re)
{
if (!RREGEXP(re)->ptr || !RREGEXP(re)->str) {
rb_raise(rb_eTypeError, "uninitialized Regexp");
}
}
static void
rb_reg_expr_str(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(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) {
char opts[4];
rb_reg_check(re);
if (*option_to_str(opts, RREGEXP(re)->ptr->options))
rb_str_buf_cat2(str, opts);
if (FL_TEST(re, KCODE_FIXED)) {
rb_str_buf_cat2(str, opt_kcode(RBASIC(re)->flags & KCODE_MASK));
}
}
OBJ_INFECT(str, re);
return str;
}
/*
* call-seq:
* rxp.source => str
*
* Returns the original string of the pattern.
*
* /ab+c/ix.source #=> "ab+c"
*/
static VALUE
rb_reg_source(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;
}
/*
* call-seq:
* rxp.inspect => string
*
* Produce a nicely formatted string-version of _rxp_. Perhaps surprisingly,
* <code>#inspect</code> actually produces the more natural version of
* the string than <code>#to_s</code>.
*
* /ab+c/ix.to_s #=> /ab+c/ix
*/
static VALUE
rb_reg_inspect(VALUE re)
{
rb_reg_check(re);
return rb_reg_desc(RREGEXP(re)->str, RREGEXP(re)->len, re);
}
/*
* call-seq:
* rxp.to_s => str
*
* Returns a string containing the regular expression and its options (using the
* <code>(?xxx:yyy)</code> notation. This string can be fed back in to
* <code>Regexp::new</code> to a regular expression with the same semantics as
* the original. (However, <code>Regexp#==</code> may not return true when
* comparing the two, as the source of the regular expression itself may
* differ, as the example shows). <code>Regexp#inspect</code> produces a
* generally more readable version of <i>rxp</i>.
*
* r1 = /ab+c/ix #=> /ab+c/ix
* s1 = r1.to_s #=> "(?ix-m:ab+c)"
* r2 = Regexp.new(s1) #=> /(?ix-m:ab+c)/
* r1 == r2 #=> false
* r1.source #=> "ab+c"
* r2.source #=> "(?ix-m:ab+c)"
*/
static VALUE
rb_reg_to_s(VALUE re)
{
int options, opt;
const int embeddable = ONIG_OPTION_MULTILINE|ONIG_OPTION_IGNORECASE|ONIG_OPTION_EXTEND;
long len;
const UChar* ptr;
VALUE str = rb_str_buf_new2("(?");
char optbuf[5];
rb_reg_check(re);
options = RREGEXP(re)->ptr->options;
ptr = (UChar*)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 {
opt = char_to_option((int )*ptr);
if (opt != 0) {
options |= opt;
}
else {
break;
}
++ptr;
} while (--len > 0);
}
if (len > 1 && *ptr == '-') {
++ptr;
--len;
do {
opt = char_to_option((int )*ptr);
if (opt != 0) {
options &= ~opt;
}
else {
break;
}
++ptr;
} while (--len > 0);
}
if (*ptr == ')') {
--len;
++ptr;
goto again;
}
if (*ptr == ':' && ptr[len-1] == ')') {
int r;
Regexp *rp;
kcode_set_option(re);
r = onig_alloc_init(&rp, ONIG_OPTION_DEFAULT,
ONIGENC_CASE_FOLD_DEFAULT,
onigenc_get_default_encoding(),
OnigDefaultSyntax);
if (r == 0) {
++ptr;
len -= 2;
err = (onig_compile(rp, ptr, ptr + len, NULL) != 0);
}
kcode_reset_option();
onig_free(rp);
}
if (err) {
options = RREGEXP(re)->ptr->options;
ptr = (UChar*)RREGEXP(re)->str;
len = RREGEXP(re)->len;
}
}
if (*option_to_str(optbuf, options)) rb_str_buf_cat2(str, optbuf);
if ((options & embeddable) != embeddable) {
optbuf[0] = '-';
option_to_str(optbuf + 1, ~options);
rb_str_buf_cat2(str, optbuf);
}
rb_str_buf_cat2(str, ":");
rb_reg_expr_str(str, (char*)ptr, len);
rb_str_buf_cat2(str, ")");
OBJ_INFECT(str, re);
return str;
}
static void
rb_reg_raise(const char *s, long len, const char *err, VALUE re)
{
VALUE desc = rb_reg_desc(s, len, re);
rb_raise(rb_eRegexpError, "%s: %s", err, RSTRING_PTR(desc));
}
static VALUE
rb_reg_error_desc(const char *s, long len, int options, onig_errmsg_buffer err)
{
char opts[6];
VALUE desc = rb_str_buf_new2(err);
rb_str_buf_cat2(desc, ": /");
rb_reg_expr_str(desc, s, len);
opts[0] = '/';
option_to_str(opts + 1, options);
strlcat(opts, arg_kcode(options), sizeof(opts));
rb_str_buf_cat2(desc, opts);
return rb_exc_new3(rb_eRegexpError, desc);
}
/*
* call-seq:
* rxp.casefold? => true or false
*
* Returns the value of the case-insensitive flag.
*/
static VALUE
rb_reg_casefold_p(VALUE re)
{
rb_reg_check(re);
if (RREGEXP(re)->ptr->options & ONIG_OPTION_IGNORECASE) return Qtrue;
return Qfalse;
}
/*
* call-seq:
* rxp.options => fixnum
*
* Returns the set of bits corresponding to the options used when creating this
* Regexp (see <code>Regexp::new</code> for details. Note that additional bits
* may be set in the returned options: these are used internally by the regular
* expression code. These extra bits are ignored if the options are passed to
* <code>Regexp::new</code>.
*
* Regexp::IGNORECASE #=> 1
* Regexp::EXTENDED #=> 2
* Regexp::MULTILINE #=> 4
*
* /cat/.options #=> 128
* /cat/ix.options #=> 131
* Regexp.new('cat', true).options #=> 129
* Regexp.new('cat', 0, 's').options #=> 384
*
* r = /cat/ix
* Regexp.new(r.source, r.options) #=> /cat/ix
*/
static VALUE
rb_reg_options_m(VALUE re)
{
int options = rb_reg_options(re);
return INT2NUM(options);
}
/*
* call-seq:
* rxp.kcode => str
*
* Returns the character set code for the regexp.
*/
static VALUE
rb_reg_kcode_m(VALUE re)
{
const 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(const char *s, long len, int flags, onig_errmsg_buffer err)
{
Regexp *rp;
int r;
OnigErrorInfo einfo;
/* Handle escaped characters first. */
/* Build a copy of the string (in dest) with the
escaped characters translated, and generate the regex
from that.
*/
r = onig_alloc_init(&rp, flags,
ONIGENC_CASE_FOLD_DEFAULT,
onigenc_get_default_encoding(),
OnigDefaultSyntax);
if (r) {
onig_error_code_to_str((UChar*)err, r);
return 0;
}
r = onig_compile(rp, (UChar*)s, (UChar*)(s + len), &einfo);
if (r != 0) {
onig_free(rp);
(void )onig_error_code_to_str((UChar*)err, r, &einfo);
return 0;
}
return rp;
}
/*
* Document-class: MatchData
*
* <code>MatchData</code> is the type of the special variable <code>$~</code>,
* and is the type of the object returned by <code>Regexp#match</code> and
* <code>Regexp#last_match</code>. It encapsulates all the results of a pattern
* match, results normally accessed through the special variables
* <code>$&</code>, <code>$'</code>, <code>$`</code>, <code>$1</code>,
* <code>$2</code>, and so on. <code>Matchdata</code> is also known as
* <code>MatchingData</code>.
*
*/
VALUE rb_cMatch;
static VALUE
match_alloc(VALUE klass)
{
NEWOBJ(match, struct RMatch);
OBJSETUP(match, klass, T_MATCH);
match->str = 0;
match->regs = 0;
match->regexp = 0;
match->regs = ALLOC(struct re_registers);
MEMZERO(match->regs, struct re_registers, 1);
return (VALUE)match;
}
/* :nodoc: */
static VALUE
match_init_copy(VALUE obj, VALUE 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;
onig_region_free(RMATCH(obj)->regs, 0);
RMATCH(obj)->regs->allocated = 0;
onig_region_copy(RMATCH(obj)->regs, RMATCH(orig)->regs);
return obj;
}
/*
* call-seq:
* mtch.length => integer
* mtch.size => integer
*
* Returns the number of elements in the match array.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.length #=> 5
* m.size #=> 5
*/
static VALUE
match_size(VALUE match)
{
return INT2FIX(RMATCH(match)->regs->num_regs);
}
/*
* call-seq:
* mtch.offset(n) => array
*
* Returns a two-element array containing the beginning and ending offsets of
* the <em>n</em>th match.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.offset(0) #=> [1, 7]
* m.offset(4) #=> [6, 7]
*/
static VALUE
match_offset(VALUE match, VALUE 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]));
}
/*
* call-seq:
* mtch.begin(n) => integer
*
* Returns the offset of the start of the <em>n</em>th element of the match
* array in the string.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.begin(0) #=> 1
* m.begin(2) #=> 2
*/
static VALUE
match_begin(VALUE match, VALUE 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]);
}
/*
* call-seq:
* mtch.end(n) => integer
*
* Returns the offset of the character immediately following the end of the
* <em>n</em>th element of the match array in the string.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.end(0) #=> 7
* m.end(2) #=> 3
*/
static VALUE
match_end(VALUE match, VALUE 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(VALUE match)
{
FL_SET(match, MATCH_BUSY);
}
int ruby_ignorecase;
static int may_need_recompile;
static void
rb_reg_prepare_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 |= ONIG_OPTION_IGNORECASE;
need_recompile = 1;
}
if (!ruby_ignorecase && state) {
FL_UNSET(re, REG_CASESTATE);
RREGEXP(re)->ptr->options &= ~ONIG_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) {
onig_errmsg_buffer err;
int r;
OnigErrorInfo einfo;
regex_t *reg, *reg2;
UChar *pattern;
if (FL_TEST(re, KCODE_FIXED))
kcode_set_option(re);
rb_reg_check(re);
reg = RREGEXP(re)->ptr;
pattern = ((UChar*)RREGEXP(re)->str);
r = onig_new(&reg2, (UChar* )pattern,
(UChar* )(pattern + RREGEXP(re)->len),
reg->options, onigenc_get_default_encoding(),
OnigDefaultSyntax, &einfo);
if (r) {
onig_error_code_to_str((UChar*)err, r, &einfo);
rb_reg_raise((char* )pattern, RREGEXP(re)->len, err, re);
}
RREGEXP(re)->ptr = reg2;
onig_free(reg);
}
}
long
rb_reg_adjust_startpos(VALUE re, VALUE str, long pos, long reverse)
{
long range;
OnigEncoding enc;
UChar *p, *string;
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_LEN(str) - pos;
}
enc = (RREGEXP(re)->ptr)->enc;
if (pos > 0 && ONIGENC_MBC_MAXLEN(enc) != 1 && pos < RSTRING_LEN(str)) {
string = (UChar*)RSTRING_PTR(str);
if (range > 0) {
p = onigenc_get_right_adjust_char_head(enc, string, string + pos);
}
else {
p = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, string, string + pos);
}
return p - string;
}
return pos;
}
long
rb_reg_search(VALUE re, VALUE str, long pos, long reverse)
{
long result;
VALUE match;
static struct re_registers regs;
long range;
if (pos > RSTRING_LEN(str) || 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_LEN(str) - pos;
}
result = onig_search(RREGEXP(re)->ptr,
(UChar*)(RSTRING_PTR(str)),
((UChar*)(RSTRING_PTR(str)) + RSTRING_LEN(str)),
((UChar*)(RSTRING_PTR(str)) + pos),
((UChar*)(RSTRING_PTR(str)) + pos + range),
&regs, ONIG_OPTION_NONE);
if (FL_TEST(re, KCODE_FIXED))
kcode_reset_option();
if (result < 0) {
if (result == ONIG_MISMATCH) {
rb_backref_set(Qnil);
return result;
}
else {
onig_errmsg_buffer err;
onig_error_code_to_str((UChar*)err, result);
rb_reg_raise(RREGEXP(re)->str, RREGEXP(re)->len, err, 0);
}
}
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);
}
onig_region_copy(RMATCH(match)->regs, &regs);
RMATCH(match)->str = rb_str_new4(str);
RMATCH(match)->regexp = re;
rb_backref_set(match);
OBJ_INFECT(match, re);
OBJ_INFECT(match, str);
return result;
}
VALUE
rb_reg_nth_defined(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(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(VALUE match)
{
return rb_reg_nth_match(0, match);
}
/*
* call-seq:
* mtch.pre_match => str
*
* Returns the portion of the original string before the current match.
* Equivalent to the special variable <code>$`</code>.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.pre_match #=> "T"
*/
VALUE
rb_reg_match_pre(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;
}
/*
* call-seq:
* mtch.post_match => str
*
* Returns the portion of the original string after the current match.
* Equivalent to the special variable <code>$'</code>.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138: The Movie")
* m.post_match #=> ": The Movie"
*/
VALUE
rb_reg_match_post(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_LEN(str) - pos);
if (OBJ_TAINTED(match)) OBJ_TAINT(str);
return str;
}
VALUE
rb_reg_match_last(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(void)
{
return rb_reg_last_match(rb_backref_get());
}
static VALUE
prematch_getter(void)
{
return rb_reg_match_pre(rb_backref_get());
}
static VALUE
postmatch_getter(void)
{
return rb_reg_match_post(rb_backref_get());
}
static VALUE
last_paren_match_getter(void)
{
return rb_reg_match_last(rb_backref_get());
}
static VALUE
match_array(VALUE match, int start)
{
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=start; 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;
}
/* [MG]:FIXME: I put parens around the /.../.match() in the first line of the
second example to prevent the '*' followed by a '/' from ending the
comment. */
/*
* call-seq:
* mtch.to_a => anArray
*
* Returns the array of matches.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.to_a #=> ["HX1138", "H", "X", "113", "8"]
*
* Because <code>to_a</code> is called when expanding
* <code>*</code><em>variable</em>, there's a useful assignment
* shortcut for extracting matched fields. This is slightly slower than
* accessing the fields directly (as an intermediate array is
* generated).
*
* all,f1,f2,f3 = *(/(.)(.)(\d+)(\d)/.match("THX1138."))
* all #=> "HX1138"
* f1 #=> "H"
* f2 #=> "X"
* f3 #=> "113"
*/
static VALUE
match_to_a(VALUE match)
{
return match_array(match, 0);
}
/*
* call-seq:
* mtch.captures => array
*
* Returns the array of captures; equivalent to <code>mtch.to_a[1..-1]</code>.
*
* f1,f2,f3,f4 = /(.)(.)(\d+)(\d)/.match("THX1138.").captures
* f1 #=> "H"
* f2 #=> "X"
* f3 #=> "113"
* f4 #=> "8"
*/
static VALUE
match_captures(VALUE match)
{
return match_array(match, 1);
}
static int
name_to_backref_number(struct re_registers *regs, VALUE regexp, const char* name, const char* name_end)
{
int num;
num = onig_name_to_backref_number(RREGEXP(regexp)->ptr,
(const unsigned char* )name, (const unsigned char* )name_end, regs);
if (num >= 1) {
return num;
}
else {
VALUE s = rb_str_new(name, (long )(name_end - name));
rb_raise(rb_eRuntimeError, "undefined group name reference: %s",
StringValuePtr(s));
}
}
/*
* call-seq:
* mtch[i] => str or nil
* mtch[start, length] => array
* mtch[range] => array
* mtch[name] => str or nil
*
* Match Reference---<code>MatchData</code> acts as an array, and may be
* accessed using the normal array indexing techniques. <i>mtch</i>[0] is
* equivalent to the special variable <code>$&</code>, and returns the entire
* matched string. <i>mtch</i>[1], <i>mtch</i>[2], and so on return the values
* of the matched backreferences (portions of the pattern between parentheses).
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m[0] #=> "HX1138"
* m[1, 2] #=> ["H", "X"]
* m[1..3] #=> ["H", "X", "113"]
* m[-3, 2] #=> ["X", "113"]
*
* m = /(?<foo>a+)b/.match("ccaaab")
* m["foo"] #=> "aaa"
* m[:foo] #=> "aaa"
*/
static VALUE
match_aref(int argc, VALUE *argv, VALUE match)
{
VALUE idx, rest;
rb_scan_args(argc, argv, "11", &idx, &rest);
if (NIL_P(rest)) {
if (FIXNUM_P(idx)) {
if (FIX2INT(idx) >= 0) {
return rb_reg_nth_match(FIX2INT(idx), match);
}
}
else {
const char *p;
int num;
switch (TYPE(idx)) {
case T_SYMBOL:
p = rb_id2name(SYM2ID(idx));
goto name_to_backref;
break;
case T_STRING:
p = StringValuePtr(idx);
name_to_backref:
num = name_to_backref_number(RMATCH(match)->regs,
RMATCH(match)->regexp, p, p + strlen(p));
return rb_reg_nth_match(num, match);
break;
default:
break;
}
}
}
return rb_ary_aref(argc, argv, match_to_a(match));
}
static VALUE
match_entry(VALUE match, long n)
{
return rb_reg_nth_match(n, match);
}
/*
* call-seq:
if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify regexp");
* mtch.select([index]*) => array
*
* Uses each <i>index</i> to access the matching values, returning an array of
* the corresponding matches.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138: The Movie")
* m.to_a #=> ["HX1138", "H", "X", "113", "8"]
* m.select(0, 2, -2) #=> ["HX1138", "X", "113"]
*/
static VALUE
match_values_at(int argc, VALUE *argv, VALUE match)
{
return rb_get_values_at(match, RMATCH(match)->regs->num_regs, argc, argv, match_entry);
}
/*
* call-seq:
* mtch.select([index]*) => array
*
* Uses each <i>index</i> to access the matching values, returning an
* array of the corresponding matches.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138: The Movie")
* m.to_a #=> ["HX1138", "H", "X", "113", "8"]
* m.select(0, 2, -2) #=> ["HX1138", "X", "113"]
*/
static VALUE
match_select(int argc, VALUE *argv, VALUE match)
{
if (argc > 0) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)", argc);
}
else {
struct re_registers *regs = RMATCH(match)->regs;
VALUE target = RMATCH(match)->str;
VALUE result = rb_ary_new();
int i;
int taint = OBJ_TAINTED(match);
for (i=0; i<regs->num_regs; i++) {
VALUE str = rb_str_substr(target, regs->beg[i], regs->end[i]-regs->beg[i]);
if (taint) OBJ_TAINT(str);
if (RTEST(rb_yield(str))) {
rb_ary_push(result, str);
}
}
return result;
}
}
/*
* call-seq:
* mtch.to_s => str
*
* Returns the entire matched string.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.to_s #=> "HX1138"
*/
static VALUE
match_to_s(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;
}
/*
* call-seq:
* mtch.string => str
*
* Returns a frozen copy of the string passed in to <code>match</code>.
*
* m = /(.)(.)(\d+)(\d)/.match("THX1138.")
* m.string #=> "THX1138."
*/
static VALUE
match_string(VALUE match)
{
return RMATCH(match)->str; /* str is frozen */
}
static VALUE
match_inspect(VALUE match)
{
char *cname = rb_obj_classname(match);
VALUE str;
int i;
str = rb_str_buf_new2("#<");
rb_str_buf_cat2(str, cname);
for (i = 0; i < RMATCH(match)->regs->num_regs; i++) {
VALUE v;
rb_str_buf_cat2(str, " ");
v = rb_reg_nth_match(i, match);
if (v == Qnil)
rb_str_buf_cat2(str, "nil");
else
rb_str_buf_append(str, rb_str_inspect(v));
}
rb_str_buf_cat2(str, ">");
return str;
}
VALUE rb_cRegexp;
static int
rb_reg_initialize(VALUE obj, const char *s, long len,
int options, onig_errmsg_buffer err)
{
struct RRegexp *re = RREGEXP(obj);
if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
rb_raise(rb_eSecurityError, "Insecure: can't modify regexp");
rb_check_frozen(obj);
if (FL_TEST(obj, REG_LITERAL))
rb_raise(rb_eSecurityError, "can't modify literal regexp");
if (re->ptr) onig_free(re->ptr);
if (re->str) free(re->str);
re->ptr = 0;
re->str = 0;
set_re_kcode_by_option(re, options);
if (options & ARG_KCODE_MASK) {
kcode_set_option((VALUE)re);
}
if (ruby_ignorecase) {
options |= ONIG_OPTION_IGNORECASE;
FL_SET(re, REG_CASESTATE);
}
re->ptr = make_regexp(s, len, options & ARG_REG_OPTION_MASK, err);
if (!re->ptr) return -1;
re->str = ALLOC_N(char, len+1);
memcpy(re->str, s, len);
re->str[len] = '\0';
re->len = len;
if (options & ARG_KCODE_MASK) {
kcode_reset_option();
}
return 0;
}
static VALUE
rb_reg_s_alloc(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(const char *s, long len, int options)
{
VALUE re = rb_reg_s_alloc(rb_cRegexp);
onig_errmsg_buffer err;
if (rb_reg_initialize(re, s, len, options, err) != 0) {
rb_exc_raise(rb_reg_error_desc(s, len, options, err));
}
return re;
}
VALUE
rb_reg_compile(const char *s, long len, int options)
{
VALUE re = rb_reg_s_alloc(rb_cRegexp);
onig_errmsg_buffer err;
if (rb_reg_initialize(re, s, len, options, err) != 0) {
rb_set_errinfo(rb_reg_error_desc(s, len, options, err));
return Qnil;
}
FL_SET(re, REG_LITERAL);
return re;
}
static int case_cache;
static int kcode_cache;
static VALUE reg_cache;
VALUE
rb_reg_regcomp(VALUE str)
{
volatile VALUE save_str = str;
if (reg_cache && RREGEXP(reg_cache)->len == RSTRING_LEN(str)
&& case_cache == ruby_ignorecase
&& kcode_cache == reg_kcode
&& memcmp(RREGEXP(reg_cache)->str, RSTRING_PTR(str), RSTRING_LEN(str)) == 0)
return reg_cache;
case_cache = ruby_ignorecase;
kcode_cache = reg_kcode;
return reg_cache = rb_reg_new(RSTRING_PTR(save_str), RSTRING_LEN(save_str),
ruby_ignorecase);
}
static int
rb_reg_cur_kcode(VALUE re)
{
if (FL_TEST(re, KCODE_FIXED)) {
return RBASIC(re)->flags & KCODE_MASK;
}
return 0;
}
/*
* call-seq:
* rxp.hash => fixnum
*
* Produce a hash based on the text and options of this regular expression.
*/
static VALUE
rb_reg_hash(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);
}
/*
* call-seq:
* rxp == other_rxp => true or false
* rxp.eql?(other_rxp) => true or false
*
* Equality---Two regexps are equal if their patterns are identical, they have
* the same character set code, and their <code>casefold?</code> values are the
* same.
*
* /abc/ == /abc/x #=> false
* /abc/ == /abc/i #=> false
* /abc/u == /abc/n #=> false
*/
static VALUE
rb_reg_equal(VALUE re1, VALUE 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;
}
static VALUE
reg_operand(VALUE s, int check)
{
if (SYMBOL_P(s)) {
return rb_sym_to_s(s);
}
else {
VALUE tmp = rb_check_string_type(s);
if (check && NIL_P(tmp)) {
rb_raise(rb_eTypeError, "can't convert %s to String",
rb_obj_classname(s));
}
return tmp;
}
}
static VALUE
rb_reg_match_pos(VALUE re, VALUE str, long pos)
{
if (NIL_P(str)) {
rb_backref_set(Qnil);
return Qnil;
}
str = reg_operand(str, Qtrue);
if (pos != 0) {
if (pos < 0) {
pos += RSTRING_LEN(str);
if (pos < 0) {
return Qnil;
}
}
pos = rb_reg_adjust_startpos(re, str, pos, 0);
}
pos = rb_reg_search(re, str, pos, 0);
if (pos < 0) {
return Qnil;
}
return LONG2FIX(pos);
}
/*
* call-seq:
* rxp =~ str => integer or nil
*
* Match---Matches <i>rxp</i> against <i>str</i>.
*
* /at/ =~ "input data" #=> 7
*/
VALUE
rb_reg_match(VALUE re, VALUE str)
{
return rb_reg_match_pos(re, str, 0);
}
/*
* call-seq:
* rxp === str => true or false
*
* Case Equality---Synonym for <code>Regexp#=~</code> used in case statements.
*
* a = "HELLO"
* case a
* when /^[a-z]*$/; print "Lower case\n"
* when /^[A-Z]*$/; print "Upper case\n"
* else; print "Mixed case\n"
* end
*
* <em>produces:</em>
*
* Upper case
*/
VALUE
rb_reg_eqq(VALUE re, VALUE str)
{
long start;
str = reg_operand(str, Qfalse);
if (NIL_P(str)) {
rb_backref_set(Qnil);
return Qfalse;
}
start = rb_reg_search(re, str, 0, 0);
if (start < 0) {
return Qfalse;
}
return Qtrue;
}
/*
* call-seq:
* ~ rxp => integer or nil
*
* Match---Matches <i>rxp</i> against the contents of <code>$_</code>.
* Equivalent to <code><i>rxp</i> =~ $_</code>.
*
* $_ = "input data"
* ~ /at/ #=> 7
*/
VALUE
rb_reg_match2(VALUE re)
{
long start;
VALUE line = rb_lastline_get();
if (TYPE(line) != T_STRING) {
rb_backref_set(Qnil);
return Qnil;
}
start = rb_reg_search(re, line, 0, 0);
if (start < 0) {
return Qnil;
}
return LONG2FIX(start);
}
/*
* call-seq:
* rxp.match(str) => matchdata or nil
* rxp.match(str,pos) => matchdata or nil
*
* Returns a <code>MatchData</code> object describing the match, or
* <code>nil</code> if there was no match. This is equivalent to retrieving the
* value of the special variable <code>$~</code> following a normal match.
* If the second parameter is present, it specifies the position in the string
* to begin the search.
*
* /(.)(.)(.)/.match("abc")[2] #=> "b"
* /(.)(.)/.match("abc", 1)[2] #=> "c"
*/
static VALUE
rb_reg_match_m(int argc, VALUE *argv, VALUE re)
{
VALUE result, str, initpos;
long pos;
if (rb_scan_args(argc, argv, "11", &str, &initpos) == 2) {
pos = NUM2LONG(initpos);
}
else {
pos = 0;
}
result = rb_reg_match_pos(re, str, pos);
if (NIL_P(result)) {
rb_backref_set(Qnil);
return Qnil;
}
result = rb_backref_get();
rb_match_busy(result);
return result;
}
/*
* Document-method: compile
*
* Synonym for <code>Regexp.new</code>
*/
/*
* call-seq:
* Regexp.new(string [, options [, lang]]) => regexp
* Regexp.new(regexp) => regexp
* Regexp.compile(string [, options [, lang]]) => regexp
* Regexp.compile(regexp) => regexp
*
* Constructs a new regular expression from <i>pattern</i>, which can be either
* a <code>String</code> or a <code>Regexp</code> (in which case that regexp's
* options are propagated, and new options may not be specified (a change as of
* Ruby 1.8). If <i>options</i> is a <code>Fixnum</code>, it should be one or
* more of the constants <code>Regexp::EXTENDED</code>,
* <code>Regexp::IGNORECASE</code>, and <code>Regexp::MULTILINE</code>,
* <em>or</em>-ed together. Otherwise, if <i>options</i> is not
* <code>nil</code>, the regexp will be case insensitive. The <i>lang</i>
* parameter enables multibyte support for the regexp: `n', `N' = none, `e',
* `E' = EUC, `s', `S' = SJIS, `u', `U' = UTF-8.
*
* r1 = Regexp.new('^a-z+:\\s+\w+') #=> /^a-z+:\s+\w+/
* r2 = Regexp.new('cat', true) #=> /cat/i
* r3 = Regexp.new('dog', Regexp::EXTENDED) #=> /dog/x
* r4 = Regexp.new(r2) #=> /cat/i
*/
static VALUE
rb_reg_initialize_m(int argc, VALUE *argv, VALUE self)
{
onig_errmsg_buffer err;
const char *s;
long len;
int flags = 0;
if (argc == 0 || argc > 3) {
rb_raise(rb_eArgError, "wrong number of arguments");
}
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 & ARG_REG_OPTION_MASK;
if (FL_TEST(argv[0], KCODE_FIXED)) {
flags |= re_to_kcode_arg_value(argv[0]);
}
s = RREGEXP(argv[0])->str;
len = RREGEXP(argv[0])->len;
}
else {
if (argc >= 2) {
if (FIXNUM_P(argv[1])) flags = FIX2INT(argv[1]);
else if (RTEST(argv[1])) flags = ONIG_OPTION_IGNORECASE;
}
if (argc == 3 && !NIL_P(argv[2])) {
char *kcode = StringValuePtr(argv[2]);
flags &= ~ARG_KCODE_MASK;
flags |= char_to_arg_kcode((int )kcode[0]);
}
s = StringValuePtr(argv[0]);
len = RSTRING_LEN(argv[0]);
}
if (rb_reg_initialize(self, s, len, flags, err) != 0) {
rb_exc_raise(rb_reg_error_desc(s, len, flags, err));
}
return self;
}
VALUE
rb_reg_quote(VALUE str)
{
char *s, *send, *t;
VALUE tmp;
int c;
s = RSTRING_PTR(str);
send = s + RSTRING_LEN(str);
for (; s < send; s++) {
c = *s;
if (ismbchar(*s)) {
int n = mbclen(*s);
while (n-- && s < send)
s++;
s--;
continue;
}
switch (c) {
case '[': case ']': case '{': case '}':
case '(': case ')': case '|': case '-':
case '*': case '.': case '\\':
case '?': case '+': case '^': case '$':
case ' ': case '#':
case '\t': case '\f': case '\n': case '\r':
goto meta_found;
}
}
return str;
meta_found:
tmp = rb_str_new(0, RSTRING_LEN(str)*2);
t = RSTRING_PTR(tmp);
/* copy upto metacharacter */
memcpy(t, RSTRING_PTR(str), s - RSTRING_PTR(str));
t += s - RSTRING_PTR(str);
for (; s < send; s++) {
c = *s;
if (ismbchar(*s)) {
int n = mbclen(*s);
while (n-- && s < send)
*t++ = *s++;
s--;
continue;
}
switch (c) {
case '[': case ']': case '{': case '}':
case '(': case ')': case '|': case '-':
case '*': case '.': case '\\':
case '?': case '+': case '^': case '$':
case '#':
*t++ = '\\';
break;
case ' ':
*t++ = '\\';
*t++ = ' ';
continue;
case '\t':
*t++ = '\\';
*t++ = 't';
continue;
case '\n':
*t++ = '\\';
*t++ = 'n';
continue;
case '\r':
*t++ = '\\';
*t++ = 'r';
continue;
case '\f':
*t++ = '\\';
*t++ = 'f';
continue;
}
*t++ = c;
}
rb_str_resize(tmp, t - RSTRING_PTR(tmp));
OBJ_INFECT(tmp, str);
return tmp;
}
/*
* call-seq:
* Regexp.escape(str) => a_str
* Regexp.quote(str) => a_str
*
* Escapes any characters that would have special meaning in a regular
* expression. Returns a new escaped string, or self if no characters are
* escaped. For any string,
* <code>Regexp.escape(<i>str</i>)=~<i>str</i></code> will be true.
*
* Regexp.escape('\\*?{}.') #=> \\\\\*\?\{\}\.
*/
static VALUE
rb_reg_s_quote(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;
}
str = reg_operand(str, Qtrue);
str = rb_reg_quote(str);
kcode_reset_option();
return str;
}
int
rb_kcode(void)
{
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);
}
int
rb_reg_options(VALUE re)
{
int options;
rb_reg_check(re);
options = RREGEXP(re)->ptr->options &
(ONIG_OPTION_IGNORECASE|ONIG_OPTION_MULTILINE|ONIG_OPTION_EXTEND);
if (FL_TEST(re, KCODE_FIXED)) {
options |= re_to_kcode_arg_value(re);
}
return options;
}
VALUE
rb_check_regexp_type(VALUE re)
{
return rb_check_convert_type(re, T_REGEXP, "Regexp", "to_regexp");
}
/*
* call-seq:
* Regexp.try_convert(obj) -> re or nil
*
* Try to convert <i>obj</i> into a Regexp, using to_regexp method.
* Returns converted regexp or nil if <i>obj</i> cannot be converted
* for any reason.
*
* Regexp.try_convert(/re/) # => /re/
* Regexp.try_convert("re") # => nil
*/
static VALUE
rb_reg_s_try_convert(VALUE dummy, VALUE re)
{
return rb_check_regexp_type(re);
}
/*
* call-seq:
* Regexp.union([pattern]*) => new_str
*
* Return a <code>Regexp</code> object that is the union of the given
* <em>pattern</em>s, i.e., will match any of its parts. The <em>pattern</em>s
* can be Regexp objects, in which case their options will be preserved, or
* Strings. If no arguments are given, returns <code>/(?!)/</code>.
*
* Regexp.union #=> /(?!)/
* Regexp.union("penzance") #=> /penzance/
* Regexp.union("skiing", "sledding") #=> /skiing|sledding/
* Regexp.union(/dogs/, /cats/i) #=> /(?-mix:dogs)|(?i-mx:cats)/
*/
static VALUE
rb_reg_s_union(int argc, VALUE *argv)
{
if (argc == 0) {
VALUE args[1];
args[0] = rb_str_new2("(?!)");
return rb_class_new_instance(1, args, rb_cRegexp);
}
else if (argc == 1) {
VALUE v;
v = rb_check_regexp_type(argv[0]);
if (!NIL_P(v))
return v;
else {
VALUE args[1];
args[0] = rb_reg_s_quote(argc, argv);
return rb_class_new_instance(1, args, rb_cRegexp);
}
}
else {
int i, kcode = -1;
VALUE kcode_re = Qnil;
VALUE source = rb_str_buf_new(0);
VALUE args[3];
for (i = 0; i < argc; i++) {
volatile VALUE v;
if (0 < i)
rb_str_buf_cat2(source, "|");
v = rb_check_regexp_type(argv[i]);
if (!NIL_P(v)) {
if (FL_TEST(v, KCODE_FIXED)) {
if (kcode == -1) {
kcode_re = v;
kcode = RBASIC(v)->flags & KCODE_MASK;
}
else if ((RBASIC(v)->flags & KCODE_MASK) != kcode) {
volatile VALUE str1, str2;
str1 = rb_inspect(kcode_re);
str2 = rb_inspect(v);
rb_raise(rb_eArgError, "mixed kcode: %s and %s",
RSTRING_PTR(str1), RSTRING_PTR(str2));
}
}
v = rb_reg_to_s(v);
}
else {
args[0] = argv[i];
v = rb_reg_s_quote(1, args);
}
rb_str_buf_append(source, v);
}
args[0] = source;
args[1] = Qnil;
if (kcode == -1) {
args[2] = Qnil;
}
else {
args[2] = rb_str_new2(opt_kcode(kcode));
}
return rb_class_new_instance(3, args, rb_cRegexp);
}
}
/* :nodoc: */
static VALUE
rb_reg_init_copy(VALUE copy, VALUE re)
{
onig_errmsg_buffer err;
const char *s;
long len;
int options;
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);
s = RREGEXP(re)->str;
len = RREGEXP(re)->len;
options = rb_reg_options(re);
if (rb_reg_initialize(copy, s, len, options, err) != 0) {
rb_exc_raise(rb_reg_error_desc(s, len, options, err));
}
return copy;
}
VALUE
rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
{
VALUE val = 0;
char *p, *s, *e;
unsigned char uc;
int no;
p = s = RSTRING_PTR(str);
e = s + RSTRING_LEN(str);
while (s < e) {
char *ss = s;
uc = (unsigned char)*s++;
if (ismbchar(uc)) {
s += mbclen(uc) - 1;
continue;
}
if (uc != '\\' || 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);
}
uc = (unsigned char)*s++;
p = s;
switch (uc) {
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (onig_noname_group_capture_is_active(RREGEXP(regexp)->ptr)) {
no = uc - '0';
}
else {
continue;
}
break;
case 'k':
if (s < e && *s == '<') {
char *name, *name_end;
name_end = name = s + 1;
while (name_end < e) {
if (*name_end == '>') break;
uc = (unsigned char)*name_end;
name_end += mbclen(uc);
}
if (name_end < e) {
no = name_to_backref_number(regs, regexp, name, name_end);
p = s = name_end + 1;
break;
}
else {
rb_raise(rb_eRuntimeError, "invalid group name reference format");
}
}
rb_str_buf_cat(val, s-2, 2);
continue;
case '0':
case '&':
no = 0;
break;
case '`':
rb_str_buf_cat(val, RSTRING_PTR(src), BEG(0));
continue;
case '\'':
rb_str_buf_cat(val, RSTRING_PTR(src)+END(0), RSTRING_LEN(src)-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_PTR(src)+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(void)
{
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(void)
{
return rb_str_new2(rb_get_kcode());
}
void
rb_set_kcode(const char *code)
{
if (code == 0) goto set_no_conversion;
switch (code[0]) {
case 'E':
case 'e':
reg_kcode = KCODE_EUC;
onigenc_set_default_encoding(ONIG_ENCODING_EUC_JP);
break;
case 'S':
case 's':
reg_kcode = KCODE_SJIS;
onigenc_set_default_encoding(ONIG_ENCODING_SJIS);
break;
case 'U':
case 'u':
reg_kcode = KCODE_UTF8;
onigenc_set_default_encoding(ONIG_ENCODING_UTF8);
break;
default:
case 'N':
case 'n':
case 'A':
case 'a':
set_no_conversion:
reg_kcode = KCODE_NONE;
onigenc_set_default_encoding(ONIG_ENCODING_ASCII);
break;
}
}
static void
kcode_setter(VALUE val)
{
may_need_recompile = 1;
rb_set_kcode(StringValuePtr(val));
}
static VALUE
ignorecase_getter(void)
{
return ruby_ignorecase?Qtrue:Qfalse;
}
static void
ignorecase_setter(VALUE val, ID id)
{
rb_warn("modifying %s is deprecated", rb_id2name(id));
may_need_recompile = 1;
ruby_ignorecase = RTEST(val);
}
static VALUE
match_getter(void)
{
VALUE match = rb_backref_get();
if (NIL_P(match)) return Qnil;
rb_match_busy(match);
return match;
}
static void
match_setter(VALUE val)
{
if (!NIL_P(val)) {
Check_Type(val, T_MATCH);
}
rb_backref_set(val);
}
/*
* call-seq:
* Regexp.last_match => matchdata
* Regexp.last_match(fixnum) => str
*
* The first form returns the <code>MatchData</code> object generated by the
* last successful pattern match. Equivalent to reading the global variable
* <code>$~</code>. The second form returns the nth field in this
* <code>MatchData</code> object.
*
* /c(.)t/ =~ 'cat' #=> 0
* Regexp.last_match #=> #<MatchData "cat" "a">
* Regexp.last_match(0) #=> "cat"
* Regexp.last_match(1) #=> "a"
* Regexp.last_match(2) #=> nil
*/
static VALUE
rb_reg_s_last_match(int argc, VALUE *argv)
{
VALUE nth;
if (rb_scan_args(argc, argv, "01", &nth) == 1) {
return rb_reg_nth_match(NUM2INT(nth), rb_backref_get());
}
return match_getter();
}
/*
* Document-class: Regexp
*
* A <code>Regexp</code> holds a regular expression, used to match a pattern
* against strings. Regexps are created using the <code>/.../</code> and
* <code>%r{...}</code> literals, and by the <code>Regexp::new</code>
* constructor.
*
*/
void
Init_Regexp(void)
{
rb_eRegexpError = rb_define_class("RegexpError", rb_eStandardError);
onigenc_set_default_caseconv_table((UChar*)casetable);
#if DEFAULT_KCODE == KCODE_EUC
onigenc_set_default_encoding(ONIG_ENCODING_EUC_JP);
#else
#if DEFAULT_KCODE == KCODE_SJIS
onigenc_set_default_encoding(ONIG_ENCODING_SJIS);
#else
#if DEFAULT_KCODE == KCODE_UTF8
onigenc_set_default_encoding(ONIG_ENCODING_UTF8);
#else
onigenc_set_default_encoding(ONIG_ENCODING_ASCII);
#endif
#endif
#endif
rb_define_virtual_variable("$~", 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, "union", rb_reg_s_union, -1);
rb_define_singleton_method(rb_cRegexp, "last_match", rb_reg_s_last_match, -1);
rb_define_singleton_method(rb_cRegexp, "try_convert", rb_reg_s_try_convert, 1);
rb_define_method(rb_cRegexp, "initialize", rb_reg_initialize_m, -1);
rb_define_method(rb_cRegexp, "initialize_copy", rb_reg_init_copy, 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(ONIG_OPTION_IGNORECASE));
rb_define_const(rb_cRegexp, "EXTENDED", INT2FIX(ONIG_OPTION_EXTEND));
rb_define_const(rb_cRegexp, "MULTILINE", INT2FIX(ONIG_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, "initialize_copy", match_init_copy, 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, "[]", match_aref, -1);
rb_define_method(rb_cMatch, "captures", match_captures, 0);
rb_define_method(rb_cMatch, "select", match_select, -1);
rb_define_method(rb_cMatch, "values_at", match_values_at, -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", match_inspect, 0);
rb_define_method(rb_cMatch, "string", match_string, 0);
}
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