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Issue #23573: Increased performance of string search operations (str.find,

Browse source 
str.index, str.count, the in operator, str.split, str.partition) with
arguments of different kinds (UCS1, UCS2, UCS4).
This commit is contained in:
Serhiy Storchaka 2015-03-24 21:55:47 +02:00
parent f7ef47583e
commit d9d769fcdd
6 changed files with 253 additions and 198 deletions
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23
Objects/stringlib/find.h
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@ -11,8 +11,7 @@ STRINGLIB(find)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
{
Py_ssize_t pos;
if (str_len < 0)
return -1;
assert(str_len >= 0);
if (sub_len == 0)
return offset;
@ -31,8 +30,7 @@ STRINGLIB(rfind)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
{
Py_ssize_t pos;
if (str_len < 0)
return -1;
assert(str_len >= 0);
if (sub_len == 0)
return str_len + offset;
@ -44,27 +42,11 @@ STRINGLIB(rfind)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
return pos;
}
/* helper macro to fixup start/end slice values */
#define ADJUST_INDICES(start, end, len) \
if (end > len) \
end = len; \
else if (end < 0) { \
end += len; \
if (end < 0) \
end = 0; \
} \
if (start < 0) { \
start += len; \
if (start < 0) \
start = 0; \
}
Py_LOCAL_INLINE(Py_ssize_t)
STRINGLIB(find_slice)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
Py_ssize_t start, Py_ssize_t end)
{
ADJUST_INDICES(start, end, str_len);
return STRINGLIB(find)(str + start, end - start, sub, sub_len, start);
}
@ -73,7 +55,6 @@ STRINGLIB(rfind_slice)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
Py_ssize_t start, Py_ssize_t end)
{
ADJUST_INDICES(start, end, str_len);
return STRINGLIB(rfind)(str + start, end - start, sub, sub_len, start);
}