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string.c: fast path of lstrip_offset

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* string.c (lstrip_offset): add a fast path in the case of single
  byte optimizable strings, as well as rstrip_offset.
  [ruby-core:77392] [Feature #12788]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56250 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2016-09-26 05:10:56 +00:00
parent 3973cc5820
commit 8d501ec021
2 changed files with 18 additions and 6 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Mon Sep 26 14:10:54 2016 Ary Borenszweig <ary@esperanto.org.ar>
* string.c (lstrip_offset): add a fast path in the case of single
byte optimizable strings, as well as rstrip_offset.
[ruby-core:77392] [Feature #12788]
Mon Sep 26 12:00:12 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
* gems/bundled_gems: update to minitest-5.9.1.

18
string.c
View file

@ -8041,13 +8041,19 @@ lstrip_offset(VALUE str, const char *s, const char *e, rb_encoding *enc)
const char *const start = s;
if (!s || s >= e) return 0;
/* remove spaces at head */
while (s < e) {
int n;
unsigned int cc = rb_enc_codepoint_len(s, e, &n, enc);
if (!rb_isspace(cc)) break;
s += n;
/* remove spaces at head */
if (single_byte_optimizable(str)) {
while (s < e && ascii_isspace(*s)) s++;
}
else {
while (s < e) {
int n;
unsigned int cc = rb_enc_codepoint_len(s, e, &n, enc);
if (!rb_isspace(cc)) break;
s += n;
}
}
return s - start;
}