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* string.c (rb_str_substr): optimized for UTF-8.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15511 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2008-02-16 11:53:04 +00:00
parent 8bcfa698a0
commit 66583d9663
2 changed files with 64 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,7 @@
Sat Feb 16 20:49:34 2008 NARUSE, Yui <naruse@ruby-lang.org>
* string.c (rb_str_substr): optimized for UTF-8.
Sat Feb 16 18:13:53 2008 Tanaka Akira <akr@fsij.org>
* encoding.c (rb_enc_compatible): check encoding incapable arguments.
@ -12,7 +16,7 @@ Sat Feb 16 19:04:17 2008 NARUSE, Yui <naruse@ruby-lang.org>
Sat Feb 16 18:25:14 2008 NARUSE, Yui <naruse@ruby-lang.org>
* string.c (str_strlen): little more optimize.
* string.c (str_strlen): little more optimization.
(rb_enc_nth): remove needless variable 'c'.
Sat Feb 16 18:00:13 2008 Tanaka Akira <akr@fsij.org>

59
string.c
View file

@ -1011,6 +1011,58 @@ str_offset(const char *p, const char *e, int nth, rb_encoding *enc, int singleby
return pp - p;
}
#ifdef NONASCII_MASK
static char *
str_utf8_nth(const char *p, const char *e, int nth)
{
if (sizeof(long) * 2 < nth) {
const unsigned long *s, *t;
const VALUE lowbits = sizeof(unsigned long) - 1;
s = (const unsigned long*)(~lowbits & ((VALUE)p + lowbits));
t = (const unsigned long*)(~lowbits & (VALUE)e);
for (; p<(const char *)s && 0<nth; p++) {
if (((*p)&0xC0) != 0x80) nth--;
}
while (s < t) {
unsigned long d = *s++;
d = ~d | (d<<1);
d &= NONASCII_MASK;
d >>= 7;
d += (d>>8);
d += (d>>16);
#if NONASCII_MASK == 0x8080808080808080UL
d += (d>>32);
#endif
nth -= (long)(d&0xF);
if (nth < 8) {
t = s;
break;
}
}
p = (char *)t;
}
if (0 < nth) {
while (p < e) {
if (((*p)&0xC0) != 0x80) {
nth--;
if (nth < 0)
break;
}
p++;
}
}
return (char *)p;
}
static int
str_utf8_offset(const char *p, const char *e, int nth)
{
const char *pp = str_utf8_nth(p, e, nth);
if (!pp) return e - p;
return pp - p;
}
#endif
static long
str_sublen(VALUE str, long pos, rb_encoding *enc)
{
@ -1082,6 +1134,13 @@ rb_str_substr(VALUE str, long beg, long len)
if (len == 0) {
p = 0;
}
#ifdef NONASCII_MASK
else if (ENC_CODERANGE(str) == ENC_CODERANGE_VALID &&
enc == rb_utf8_encoding()) {
p = str_utf8_nth(s, e, beg);
len = str_utf8_offset(p, e, len);
}
#endif
else if ((p = str_nth(s, e, beg, enc, singlebyte)) == e) {
len = 0;
}