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needforspeed: refactored the replace code slightly; special-case

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constant-length changes; use fastsearch to locate the first match.
This commit is contained in:
Fredrik Lundh 2006-05-24 16:35:18 +00:00
parent eb62127842
commit 347ee277aa
1 changed files with 86 additions and 84 deletions
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170
Objects/unicodeobject.c
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@ -2020,9 +2020,20 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
*/
static const Py_UNICODE *findchar(const Py_UNICODE *s,
Py_ssize_t size,
Py_UNICODE ch);
LOCAL(const Py_UNICODE *) findchar(const Py_UNICODE *s,
Py_ssize_t size,
Py_UNICODE ch)
{
/* like wcschr, but doesn't stop at NULL characters */
while (size-- > 0) {
if (*s == ch)
return s;
s++;
}
return NULL;
}
static
PyObject *unicodeescape_string(const Py_UNICODE *s,
@ -4141,22 +4152,6 @@ Py_ssize_t PyUnicode_Tailmatch(PyObject *str,
return result;
}
static
const Py_UNICODE *findchar(const Py_UNICODE *s,
Py_ssize_t size,
Py_UNICODE ch)
{
/* like wcschr, but doesn't stop at NULL characters */
while (size-- > 0) {
if (*s == ch)
return s;
s++;
}
return NULL;
}
/* Apply fixfct filter to the Unicode object self and return a
reference to the modified object */
@ -4825,36 +4820,47 @@ PyObject *replace(PyUnicodeObject *self,
if (maxcount < 0)
maxcount = PY_SSIZE_T_MAX;
if (str1->length == 1 && str2->length == 1) {
if (str1->length == str2->length) {
/* same length */
Py_ssize_t i;
/* replace characters */
if (!findchar(self->str, self->length, str1->str[0]) &&
PyUnicode_CheckExact(self)) {
/* nothing to replace, return original string */
Py_INCREF(self);
u = self;
if (str1->length == 1) {
/* replace characters */
Py_UNICODE u1, u2;
if (!findchar(self->str, self->length, str1->str[0]))
goto nothing;
u = (PyUnicodeObject*) PyUnicode_FromUnicode(NULL, self->length);
if (!u)
return NULL;
Py_UNICODE_COPY(u->str, self->str, self->length);
u1 = str1->str[0];
u2 = str2->str[0];
for (i = 0; i < u->length; i++)
if (u->str[i] == u1) {
if (--maxcount < 0)
break;
u->str[i] = u2;
}
} else {
Py_UNICODE u1 = str1->str[0];
Py_UNICODE u2 = str2->str[0];
u = (PyUnicodeObject*) PyUnicode_FromUnicode(
NULL,
self->length
i = fastsearch(
self->str, self->length, str1->str, str1->length, FAST_SEARCH
);
if (u != NULL) {
Py_UNICODE_COPY(u->str, self->str,
self->length);
for (i = 0; i < u->length; i++)
if (u->str[i] == u1) {
if (--maxcount < 0)
break;
u->str[i] = u2;
}
if (i < 0)
goto nothing;
u = (PyUnicodeObject*) PyUnicode_FromUnicode(NULL, self->length);
if (!u)
return NULL;
Py_UNICODE_COPY(u->str, self->str, self->length);
while (i <= self->length - str1->length)
if (Py_UNICODE_MATCH(self, i, str1)) {
if (--maxcount < 0)
break;
Py_UNICODE_COPY(u->str+i, str2->str, str2->length);
i += str1->length;
} else
i++;
}
}
} else {
Py_ssize_t n, i;
Py_UNICODE *p;
@ -4862,51 +4868,47 @@ PyObject *replace(PyUnicodeObject *self,
n = count(self, 0, self->length, str1);
if (n > maxcount)
n = maxcount;
if (n == 0) {
/* nothing to replace, return original string */
if (PyUnicode_CheckExact(self)) {
Py_INCREF(self);
u = self;
}
else {
u = (PyUnicodeObject *)
PyUnicode_FromUnicode(self->str, self->length);
}
} else {
u = _PyUnicode_New(
self->length + n * (str2->length - str1->length));
if (u) {
i = 0;
p = u->str;
if (str1->length > 0) {
while (i <= self->length - str1->length)
if (Py_UNICODE_MATCH(self, i, str1)) {
/* replace string segment */
Py_UNICODE_COPY(p, str2->str, str2->length);
p += str2->length;
i += str1->length;
if (--n <= 0) {
/* copy remaining part */
Py_UNICODE_COPY(p, self->str+i, self->length-i);
break;
}
} else
*p++ = self->str[i++];
} else {
while (n > 0) {
Py_UNICODE_COPY(p, str2->str, str2->length);
p += str2->length;
if (--n <= 0)
break;
*p++ = self->str[i++];
if (n == 0)
goto nothing;
u = _PyUnicode_New(self->length + n * (str2->length - str1->length));
if (!u)
return NULL;
i = 0;
p = u->str;
if (str1->length > 0) {
while (i <= self->length - str1->length)
if (Py_UNICODE_MATCH(self, i, str1)) {
/* replace string segment */
Py_UNICODE_COPY(p, str2->str, str2->length);
p += str2->length;
i += str1->length;
if (--n <= 0) {
/* copy remaining part */
Py_UNICODE_COPY(p, self->str+i, self->length-i);
break;
}
Py_UNICODE_COPY(p, self->str+i, self->length-i);
}
} else
*p++ = self->str[i++];
} else {
while (n > 0) {
Py_UNICODE_COPY(p, str2->str, str2->length);
p += str2->length;
if (--n <= 0)
break;
*p++ = self->str[i++];
}
Py_UNICODE_COPY(p, self->str+i, self->length-i);
}
}
return (PyObject *) u;
nothing:
/* nothing to replace; return original string (when possible) */
if (PyUnicode_CheckExact(self)) {
Py_INCREF(self);
return (PyObject *) self;
}
return PyUnicode_FromUnicode(self->str, self->length);
}
/* --- Unicode Object Methods --------------------------------------------- */