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Core: String::Find(String) optimizations, refactoring

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git-svn-id: svn://ultimatepp.org/upp/trunk@6977 f0d560ea-af0d-0410-9eb7-867de7ffcac7
This commit is contained in:
cxl 2014-03-02 10:01:14 +00:00
parent 2d902f2fa1
commit 51ff437d49
4 changed files with 115 additions and 58 deletions
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78
uppsrc/Core/String.cpp
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@ -2,6 +2,84 @@
NAMESPACE_UPP
template <class tchar>
int t_find(const tchar *ptr, int plen, const tchar *s, int len, int from)
{
ASSERT(from >= 0 && from <= plen);
int l = plen - len - from;
if(l < 0)
return -1;
if(len == 0)
return from;
const tchar *p = ptr + from;
const tchar *e = p + l;
if(len > 4) {
tchar s0 = s[0];
tchar s1 = s[1];
tchar s2 = s[2];
tchar sl = s[len - 1];
int l_1 = len - 1;
while(p <= e) {
if(s0 == p[0] && sl == p[l_1] && s1 == p[1] && s2 == p[2] &&
svo_memeq(s + 4, p + 4, len - 5))
return (int)(p - ptr);
p++;
}
}
else
if(len == 4) {
tchar s0 = s[0];
tchar s1 = s[1];
tchar s2 = s[2];
tchar s3 = s[3];
while(p <= e) {
if(s0 == p[0] && s3 == p[3] && s1 == p[1] && s2 == p[2])
return (int)(p - ptr);
p++;
}
}
else
if(len == 3) {
tchar s0 = s[0];
tchar s1 = s[1];
tchar s2 = s[2];
while(p <= e) {
if(s0 == p[0] && s2 == p[2] && s1 == p[1])
return (int)(p - ptr);
p++;
}
}
else
if(len == 2) {
tchar s0 = s[0];
tchar s1 = s[1];
while(p <= e) {
if(s0 == p[0] && s1 == p[1])
return (int)(p - ptr);
p++;
}
}
else {
tchar s0 = s[0];
while(p <= e) {
if(s0 == *p)
return (int)(p - ptr);
p++;
}
}
return -1;
}
int find(const char *text, int len, const char *needle, int nlen, int from)
{
return t_find(text, len, needle, nlen, from);
}
int find(const wchar *text, int len, const wchar *needle, int nlen, int from)
{
return t_find(text, len, needle, nlen, from);
}
#ifdef _DEBUG
void String0::Dsyn()
{