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Patch #636005: Filter unicode into unicode.

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This commit is contained in:
Martin v. Löwis 2003-01-25 22:46:11 +00:00
parent fc03a94aac
commit 8afd7571a1
3 changed files with 70 additions and 0 deletions
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62
Python/bltinmodule.c
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@ -24,6 +24,9 @@ const char *Py_FileSystemDefaultEncoding = NULL; /* use default */
/* Forward */
static PyObject *filterstring(PyObject *, PyObject *);
#ifdef Py_USING_UNICODE
static PyObject *filterunicode(PyObject *, PyObject *);
#endif
static PyObject *filtertuple (PyObject *, PyObject *);
static PyObject *
@ -132,6 +135,10 @@ builtin_filter(PyObject *self, PyObject *args)
/* Strings and tuples return a result of the same type. */
if (PyString_Check(seq))
return filterstring(func, seq);
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(seq))
return filterunicode(func, seq);
#endif
if (PyTuple_Check(seq))
return filtertuple(func, seq);
@ -1926,3 +1933,58 @@ filterstring(PyObject *func, PyObject *strobj)
Py_DECREF(result);
return NULL;
}
#ifdef Py_USING_UNICODE
/* Helper for filter(): filter a Unicode object through a function */
static PyObject *
filterunicode(PyObject *func, PyObject *strobj)
{
PyObject *result;
register int i, j;
int len = PyUnicode_GetSize(strobj);
if (func == Py_None) {
/* No character is ever false -- share input string */
Py_INCREF(strobj);
return strobj;
}
if ((result = PyUnicode_FromUnicode(NULL, len)) == NULL)
return NULL;
for (i = j = 0; i < len; ++i) {
PyObject *item, *arg, *good;
int ok;
item = (*strobj->ob_type->tp_as_sequence->sq_item)(strobj, i);
if (item == NULL)
goto Fail_1;
arg = Py_BuildValue("(O)", item);
if (arg == NULL) {
Py_DECREF(item);
goto Fail_1;
}
good = PyEval_CallObject(func, arg);
Py_DECREF(arg);
if (good == NULL) {
Py_DECREF(item);
goto Fail_1;
}
ok = PyObject_IsTrue(good);
Py_DECREF(good);
if (ok)
PyUnicode_AS_UNICODE((PyStringObject *)result)[j++] =
PyUnicode_AS_UNICODE((PyStringObject *)item)[0];
Py_DECREF(item);
}
if (j < len)
PyUnicode_Resize(&result, j);
return result;
Fail_1:
Py_DECREF(result);
return NULL;
}
#endif