mirrors/cpython
mirrors/cpython
0
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2024-12-01 11:15:56 +01:00
Code Issues Releases Activity
aa26488711
cpython/Modules/operator.c
Larry Hastings 48986d68c2 Minor grammar refinement for hmac.compare_digest().
2012-06-25 00:59:34 -07:00

936 lines
31 KiB
C
Raw Blame History

#include "Python.h"
PyDoc_STRVAR(operator_doc,
"Operator interface.\n\
\n\
This module exports a set of functions implemented in C corresponding\n\
to the intrinsic operators of Python. For example, operator.add(x, y)\n\
is equivalent to the expression x+y. The function names are those\n\
used for special methods; variants without leading and trailing\n\
'__' are also provided for convenience.");
#define spam1(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
return AOP(a1); }
#define spam2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
return AOP(a1,a2); }
#define spamoi(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1; int a2; \
if(! PyArg_ParseTuple(a,"Oi:" #OP,&a1,&a2)) return NULL; \
return AOP(a1,a2); }
#define spam2n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
if(-1 == AOP(a1,a2)) return NULL; \
Py_INCREF(Py_None); \
return Py_None; }
#define spam3n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2, *a3; \
if(! PyArg_UnpackTuple(a,#OP,3,3,&a1,&a2,&a3)) return NULL; \
if(-1 == AOP(a1,a2,a3)) return NULL; \
Py_INCREF(Py_None); \
return Py_None; }
#define spami(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
long r; \
if(-1 == (r=AOP(a1))) return NULL; \
return PyBool_FromLong(r); }
#define spami2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; long r; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
if(-1 == (r=AOP(a1,a2))) return NULL; \
return PyLong_FromLong(r); }
#define spamn2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; Py_ssize_t r; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
if(-1 == (r=AOP(a1,a2))) return NULL; \
return PyLong_FromSsize_t(r); }
#define spami2b(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; long r; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
if(-1 == (r=AOP(a1,a2))) return NULL; \
return PyBool_FromLong(r); }
#define spamrc(OP,A) static PyObject *OP(PyObject *s, PyObject *a) { \
PyObject *a1, *a2; \
if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
return PyObject_RichCompare(a1,a2,A); }
spami(truth , PyObject_IsTrue)
spam2(op_add , PyNumber_Add)
spam2(op_sub , PyNumber_Subtract)
spam2(op_mul , PyNumber_Multiply)
spam2(op_floordiv , PyNumber_FloorDivide)
spam2(op_truediv , PyNumber_TrueDivide)
spam2(op_mod , PyNumber_Remainder)
spam1(op_neg , PyNumber_Negative)
spam1(op_pos , PyNumber_Positive)
spam1(op_abs , PyNumber_Absolute)
spam1(op_inv , PyNumber_Invert)
spam1(op_invert , PyNumber_Invert)
spam2(op_lshift , PyNumber_Lshift)
spam2(op_rshift , PyNumber_Rshift)
spami(op_not_ , PyObject_Not)
spam2(op_and_ , PyNumber_And)
spam2(op_xor , PyNumber_Xor)
spam2(op_or_ , PyNumber_Or)
spam2(op_iadd , PyNumber_InPlaceAdd)
spam2(op_isub , PyNumber_InPlaceSubtract)
spam2(op_imul , PyNumber_InPlaceMultiply)
spam2(op_ifloordiv , PyNumber_InPlaceFloorDivide)
spam2(op_itruediv , PyNumber_InPlaceTrueDivide)
spam2(op_imod , PyNumber_InPlaceRemainder)
spam2(op_ilshift , PyNumber_InPlaceLshift)
spam2(op_irshift , PyNumber_InPlaceRshift)
spam2(op_iand , PyNumber_InPlaceAnd)
spam2(op_ixor , PyNumber_InPlaceXor)
spam2(op_ior , PyNumber_InPlaceOr)
spam2(op_concat , PySequence_Concat)
spam2(op_iconcat , PySequence_InPlaceConcat)
spami2b(op_contains , PySequence_Contains)
spamn2(indexOf , PySequence_Index)
spamn2(countOf , PySequence_Count)
spam2(op_getitem , PyObject_GetItem)
spam2n(op_delitem , PyObject_DelItem)
spam3n(op_setitem , PyObject_SetItem)
spamrc(op_lt , Py_LT)
spamrc(op_le , Py_LE)
spamrc(op_eq , Py_EQ)
spamrc(op_ne , Py_NE)
spamrc(op_gt , Py_GT)
spamrc(op_ge , Py_GE)
static PyObject*
op_pow(PyObject *s, PyObject *a)
{
PyObject *a1, *a2;
if (PyArg_UnpackTuple(a,"pow", 2, 2, &a1, &a2))
return PyNumber_Power(a1, a2, Py_None);
return NULL;
}
static PyObject*
op_ipow(PyObject *s, PyObject *a)
{
PyObject *a1, *a2;
if (PyArg_UnpackTuple(a,"ipow", 2, 2, &a1, &a2))
return PyNumber_InPlacePower(a1, a2, Py_None);
return NULL;
}
static PyObject *
op_index(PyObject *s, PyObject *a)
{
return PyNumber_Index(a);
}
static PyObject*
is_(PyObject *s, PyObject *a)
{
PyObject *a1, *a2, *result = NULL;
if (PyArg_UnpackTuple(a,"is_", 2, 2, &a1, &a2)) {
result = (a1 == a2) ? Py_True : Py_False;
Py_INCREF(result);
}
return result;
}
static PyObject*
is_not(PyObject *s, PyObject *a)
{
PyObject *a1, *a2, *result = NULL;
if (PyArg_UnpackTuple(a,"is_not", 2, 2, &a1, &a2)) {
result = (a1 != a2) ? Py_True : Py_False;
Py_INCREF(result);
}
return result;
}
#undef spam1
#undef spam2
#undef spam1o
#undef spam1o
/* compare_digest **********************************************************/
/*
* timing safe compare
*
* Returns 1 of the strings are equal.
* In case of len(a) != len(b) the function tries to keep the timing
* dependent on the length of b. CPU cache locally may still alter timing
* a bit.
*/
static int
_tscmp(const unsigned char *a, const unsigned char *b,
Py_ssize_t len_a, Py_ssize_t len_b)
{
/* The volatile type declarations make sure that the compiler has no
* chance to optimize and fold the code in any way that may change
* the timing.
*/
volatile Py_ssize_t length;
volatile const unsigned char *left;
volatile const unsigned char *right;
Py_ssize_t i;
unsigned char result;
/* loop count depends on length of b */
length = len_b;
left = NULL;
right = b;
/* don't use else here to keep the amount of CPU instructions constant,
* volatile forces re-evaluation
* */
if (len_a == length) {
left = *((volatile const unsigned char**)&a);
result = 0;
}
if (len_a != length) {
left = b;
result = 1;
}
for (i=0; i < length; i++) {
result |= *left++ ^ *right++;
}
return (result == 0);
}
PyDoc_STRVAR(compare_digest__doc__,
"compare_digest(a, b) -> bool\n"
"\n"
"Return 'a == b'. This function uses an approach designed to prevent\n"
"timing analysis, making it appropriate for cryptography.\n"
"a and b must both be of the same type: either str (ASCII only),\n"
"or any type that supports the buffer protocol (e.g. bytes).\n"
"\n"
"Note: If a and b are of different lengths, or if an error occurs,\n"
"a timing attack could theoretically reveal information about the\n"
"types and lengths of a and b--but not their values.\n");
static PyObject*
compare_digest(PyObject *self, PyObject *args)
{
PyObject *a, *b;
int rc;
if (!PyArg_ParseTuple(args, "OO:compare_digest", &a, &b)) {
return NULL;
}
/* ASCII unicode string */
if(PyUnicode_Check(a) && PyUnicode_Check(b)) {
if (PyUnicode_READY(a) == -1 || PyUnicode_READY(b) == -1) {
return NULL;
}
if (!PyUnicode_IS_ASCII(a) || !PyUnicode_IS_ASCII(b)) {
PyErr_SetString(PyExc_TypeError,
"comparing strings with non-ASCII characters is "
"not supported");
return NULL;
}
rc = _tscmp(PyUnicode_DATA(a),
PyUnicode_DATA(b),
PyUnicode_GET_LENGTH(a),
PyUnicode_GET_LENGTH(b));
}
/* fallback to buffer interface for bytes, bytesarray and other */
else {
Py_buffer view_a;
Py_buffer view_b;
if ((PyObject_CheckBuffer(a) == 0) & (PyObject_CheckBuffer(b) == 0)) {
PyErr_Format(PyExc_TypeError,
"unsupported operand types(s) or combination of types: "
"'%.100s' and '%.100s'",
Py_TYPE(a)->tp_name, Py_TYPE(b)->tp_name);
return NULL;
}
if (PyObject_GetBuffer(a, &view_a, PyBUF_SIMPLE) == -1) {
return NULL;
}
if (view_a.ndim > 1) {
PyErr_SetString(PyExc_BufferError,
"Buffer must be single dimension");
PyBuffer_Release(&view_a);
return NULL;
}
if (PyObject_GetBuffer(b, &view_b, PyBUF_SIMPLE) == -1) {
PyBuffer_Release(&view_a);
return NULL;
}
if (view_b.ndim > 1) {
PyErr_SetString(PyExc_BufferError,
"Buffer must be single dimension");
PyBuffer_Release(&view_a);
PyBuffer_Release(&view_b);
return NULL;
}
rc = _tscmp((const unsigned char*)view_a.buf,
(const unsigned char*)view_b.buf,
view_a.len,
view_b.len);
PyBuffer_Release(&view_a);
PyBuffer_Release(&view_b);
}
return PyBool_FromLong(rc);
}
/* operator methods **********************************************************/
#define spam1(OP,DOC) {#OP, OP, METH_VARARGS, PyDoc_STR(DOC)},
#define spam2(OP,ALTOP,DOC) {#OP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)}, \
{#ALTOP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)},
#define spam1o(OP,DOC) {#OP, OP, METH_O, PyDoc_STR(DOC)},
#define spam2o(OP,ALTOP,DOC) {#OP, op_##OP, METH_O, PyDoc_STR(DOC)}, \
{#ALTOP, op_##OP, METH_O, PyDoc_STR(DOC)},
static struct PyMethodDef operator_methods[] = {
spam1o(truth,
"truth(a) -- Return True if a is true, False otherwise.")
spam2(contains,__contains__,
"contains(a, b) -- Same as b in a (note reversed operands).")
spam1(indexOf,
"indexOf(a, b) -- Return the first index of b in a.")
spam1(countOf,
"countOf(a, b) -- Return the number of times b occurs in a.")
spam1(is_, "is_(a, b) -- Same as a is b.")
spam1(is_not, "is_not(a, b) -- Same as a is not b.")
spam2o(index, __index__, "index(a) -- Same as a.__index__()")
spam2(add,__add__, "add(a, b) -- Same as a + b.")
spam2(sub,__sub__, "sub(a, b) -- Same as a - b.")
spam2(mul,__mul__, "mul(a, b) -- Same as a * b.")
spam2(floordiv,__floordiv__, "floordiv(a, b) -- Same as a // b.")
spam2(truediv,__truediv__, "truediv(a, b) -- Same as a / b.")
spam2(mod,__mod__, "mod(a, b) -- Same as a % b.")
spam2o(neg,__neg__, "neg(a) -- Same as -a.")
spam2o(pos,__pos__, "pos(a) -- Same as +a.")
spam2o(abs,__abs__, "abs(a) -- Same as abs(a).")
spam2o(inv,__inv__, "inv(a) -- Same as ~a.")
spam2o(invert,__invert__, "invert(a) -- Same as ~a.")
spam2(lshift,__lshift__, "lshift(a, b) -- Same as a << b.")
spam2(rshift,__rshift__, "rshift(a, b) -- Same as a >> b.")
spam2o(not_,__not__, "not_(a) -- Same as not a.")
spam2(and_,__and__, "and_(a, b) -- Same as a & b.")
spam2(xor,__xor__, "xor(a, b) -- Same as a ^ b.")
spam2(or_,__or__, "or_(a, b) -- Same as a | b.")
spam2(iadd,__iadd__, "a = iadd(a, b) -- Same as a += b.")
spam2(isub,__isub__, "a = isub(a, b) -- Same as a -= b.")
spam2(imul,__imul__, "a = imul(a, b) -- Same as a *= b.")
spam2(ifloordiv,__ifloordiv__, "a = ifloordiv(a, b) -- Same as a //= b.")
spam2(itruediv,__itruediv__, "a = itruediv(a, b) -- Same as a /= b")
spam2(imod,__imod__, "a = imod(a, b) -- Same as a %= b.")
spam2(ilshift,__ilshift__, "a = ilshift(a, b) -- Same as a <<= b.")
spam2(irshift,__irshift__, "a = irshift(a, b) -- Same as a >>= b.")
spam2(iand,__iand__, "a = iand(a, b) -- Same as a &= b.")
spam2(ixor,__ixor__, "a = ixor(a, b) -- Same as a ^= b.")
spam2(ior,__ior__, "a = ior(a, b) -- Same as a |= b.")
spam2(concat,__concat__,
"concat(a, b) -- Same as a + b, for a and b sequences.")
spam2(iconcat,__iconcat__,
"a = iconcat(a, b) -- Same as a += b, for a and b sequences.")
spam2(getitem,__getitem__,
"getitem(a, b) -- Same as a[b].")
spam2(setitem,__setitem__,
"setitem(a, b, c) -- Same as a[b] = c.")
spam2(delitem,__delitem__,
"delitem(a, b) -- Same as del a[b].")
spam2(pow,__pow__, "pow(a, b) -- Same as a ** b.")
spam2(ipow,__ipow__, "a = ipow(a, b) -- Same as a **= b.")
spam2(lt,__lt__, "lt(a, b) -- Same as a<b.")
spam2(le,__le__, "le(a, b) -- Same as a<=b.")
spam2(eq,__eq__, "eq(a, b) -- Same as a==b.")
spam2(ne,__ne__, "ne(a, b) -- Same as a!=b.")
spam2(gt,__gt__, "gt(a, b) -- Same as a>b.")
spam2(ge,__ge__, "ge(a, b) -- Same as a>=b.")
{"_compare_digest", (PyCFunction)compare_digest, METH_VARARGS,
compare_digest__doc__},
{NULL, NULL} /* sentinel */
};
/* itemgetter object **********************************************************/
typedef struct {
PyObject_HEAD
Py_ssize_t nitems;
PyObject *item;
} itemgetterobject;
static PyTypeObject itemgetter_type;
static PyObject *
itemgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
itemgetterobject *ig;
PyObject *item;
Py_ssize_t nitems;
if (!_PyArg_NoKeywords("itemgetter()", kwds))
return NULL;
nitems = PyTuple_GET_SIZE(args);
if (nitems <= 1) {
if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &item))
return NULL;
} else
item = args;
/* create itemgetterobject structure */
ig = PyObject_GC_New(itemgetterobject, &itemgetter_type);
if (ig == NULL)
return NULL;
Py_INCREF(item);
ig->item = item;
ig->nitems = nitems;
PyObject_GC_Track(ig);
return (PyObject *)ig;
}
static void
itemgetter_dealloc(itemgetterobject *ig)
{
PyObject_GC_UnTrack(ig);
Py_XDECREF(ig->item);
PyObject_GC_Del(ig);
}
static int
itemgetter_traverse(itemgetterobject *ig, visitproc visit, void *arg)
{
Py_VISIT(ig->item);
return 0;
}
static PyObject *
itemgetter_call(itemgetterobject *ig, PyObject *args, PyObject *kw)
{
PyObject *obj, *result;
Py_ssize_t i, nitems=ig->nitems;
if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &obj))
return NULL;
if (nitems == 1)
return PyObject_GetItem(obj, ig->item);
assert(PyTuple_Check(ig->item));
assert(PyTuple_GET_SIZE(ig->item) == nitems);
result = PyTuple_New(nitems);
if (result == NULL)
return NULL;
for (i=0 ; i < nitems ; i++) {
PyObject *item, *val;
item = PyTuple_GET_ITEM(ig->item, i);
val = PyObject_GetItem(obj, item);
if (val == NULL) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, val);
}
return result;
}
PyDoc_STRVAR(itemgetter_doc,
"itemgetter(item, ...) --> itemgetter object\n\
\n\
Return a callable object that fetches the given item(s) from its operand.\n\
After, f=itemgetter(2), the call f(r) returns r[2].\n\
After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])");
static PyTypeObject itemgetter_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"operator.itemgetter", /* tp_name */
sizeof(itemgetterobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)itemgetter_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)itemgetter_call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
itemgetter_doc, /* tp_doc */
(traverseproc)itemgetter_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
itemgetter_new, /* tp_new */
0, /* tp_free */
};
/* attrgetter object **********************************************************/
typedef struct {
PyObject_HEAD
Py_ssize_t nattrs;
PyObject *attr;
} attrgetterobject;
static PyTypeObject attrgetter_type;
static PyObject *
attrgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
attrgetterobject *ag;
PyObject *attr;
Py_ssize_t nattrs, idx, char_idx;
if (!_PyArg_NoKeywords("attrgetter()", kwds))
return NULL;
nattrs = PyTuple_GET_SIZE(args);
if (nattrs <= 1) {
if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &attr))
return NULL;
}
attr = PyTuple_New(nattrs);
if (attr == NULL)
return NULL;
/* prepare attr while checking args */
for (idx = 0; idx < nattrs; ++idx) {
PyObject *item = PyTuple_GET_ITEM(args, idx);
Py_ssize_t item_len;
void *data;
unsigned int kind;
int dot_count;
if (!PyUnicode_Check(item)) {
PyErr_SetString(PyExc_TypeError,
"attribute name must be a string");
Py_DECREF(attr);
return NULL;
}
if (PyUnicode_READY(item)) {
Py_DECREF(attr);
return NULL;
}
item_len = PyUnicode_GET_LENGTH(item);
kind = PyUnicode_KIND(item);
data = PyUnicode_DATA(item);
/* check whethere the string is dotted */
dot_count = 0;
for (char_idx = 0; char_idx < item_len; ++char_idx) {
if (PyUnicode_READ(kind, data, char_idx) == '.')
++dot_count;
}
if (dot_count == 0) {
Py_INCREF(item);
PyUnicode_InternInPlace(&item);
PyTuple_SET_ITEM(attr, idx, item);
} else { /* make it a tuple of non-dotted attrnames */
PyObject *attr_chain = PyTuple_New(dot_count + 1);
PyObject *attr_chain_item;
Py_ssize_t unibuff_from = 0;
Py_ssize_t unibuff_till = 0;
Py_ssize_t attr_chain_idx = 0;
if (attr_chain == NULL) {
Py_DECREF(attr);
return NULL;
}
for (; dot_count > 0; --dot_count) {
while (PyUnicode_READ(kind, data, unibuff_till) != '.') {
++unibuff_till;
}
attr_chain_item = PyUnicode_Substring(item,
unibuff_from,
unibuff_till);
if (attr_chain_item == NULL) {
Py_DECREF(attr_chain);
Py_DECREF(attr);
return NULL;
}
PyUnicode_InternInPlace(&attr_chain_item);
PyTuple_SET_ITEM(attr_chain, attr_chain_idx, attr_chain_item);
++attr_chain_idx;
unibuff_till = unibuff_from = unibuff_till + 1;
}
/* now add the last dotless name */
attr_chain_item = PyUnicode_Substring(item,
unibuff_from, item_len);
if (attr_chain_item == NULL) {
Py_DECREF(attr_chain);
Py_DECREF(attr);
return NULL;
}
PyUnicode_InternInPlace(&attr_chain_item);
PyTuple_SET_ITEM(attr_chain, attr_chain_idx, attr_chain_item);
PyTuple_SET_ITEM(attr, idx, attr_chain);
}
}
/* create attrgetterobject structure */
ag = PyObject_GC_New(attrgetterobject, &attrgetter_type);
if (ag == NULL) {
Py_DECREF(attr);
return NULL;
}
ag->attr = attr;
ag->nattrs = nattrs;
PyObject_GC_Track(ag);
return (PyObject *)ag;
}
static void
attrgetter_dealloc(attrgetterobject *ag)
{
PyObject_GC_UnTrack(ag);
Py_XDECREF(ag->attr);
PyObject_GC_Del(ag);
}
static int
attrgetter_traverse(attrgetterobject *ag, visitproc visit, void *arg)
{
Py_VISIT(ag->attr);
return 0;
}
static PyObject *
dotted_getattr(PyObject *obj, PyObject *attr)
{
PyObject *newobj;
/* attr is either a tuple or instance of str.
Ensured by the setup code of attrgetter_new */
if (PyTuple_CheckExact(attr)) { /* chained getattr */
Py_ssize_t name_idx = 0, name_count;
PyObject *attr_name;
name_count = PyTuple_GET_SIZE(attr);
Py_INCREF(obj);
for (name_idx = 0; name_idx < name_count; ++name_idx) {
attr_name = PyTuple_GET_ITEM(attr, name_idx);
newobj = PyObject_GetAttr(obj, attr_name);
Py_DECREF(obj);
if (newobj == NULL) {
return NULL;
}
/* here */
obj = newobj;
}
} else { /* single getattr */
newobj = PyObject_GetAttr(obj, attr);
if (newobj == NULL)
return NULL;
obj = newobj;
}
return obj;
}
static PyObject *
attrgetter_call(attrgetterobject *ag, PyObject *args, PyObject *kw)
{
PyObject *obj, *result;
Py_ssize_t i, nattrs=ag->nattrs;
if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &obj))
return NULL;
if (ag->nattrs == 1) /* ag->attr is always a tuple */
return dotted_getattr(obj, PyTuple_GET_ITEM(ag->attr, 0));
assert(PyTuple_Check(ag->attr));
assert(PyTuple_GET_SIZE(ag->attr) == nattrs);
result = PyTuple_New(nattrs);
if (result == NULL)
return NULL;
for (i=0 ; i < nattrs ; i++) {
PyObject *attr, *val;
attr = PyTuple_GET_ITEM(ag->attr, i);
val = dotted_getattr(obj, attr);
if (val == NULL) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, val);
}
return result;
}
PyDoc_STRVAR(attrgetter_doc,
"attrgetter(attr, ...) --> attrgetter object\n\
\n\
Return a callable object that fetches the given attribute(s) from its operand.\n\
After, f=attrgetter('name'), the call f(r) returns r.name.\n\
After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).\n\
After, h=attrgetter('name.first', 'name.last'), the call h(r) returns\n\
(r.name.first, r.name.last).");
static PyTypeObject attrgetter_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"operator.attrgetter", /* tp_name */
sizeof(attrgetterobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)attrgetter_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)attrgetter_call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
attrgetter_doc, /* tp_doc */
(traverseproc)attrgetter_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
attrgetter_new, /* tp_new */
0, /* tp_free */
};
/* methodcaller object **********************************************************/
typedef struct {
PyObject_HEAD
PyObject *name;
PyObject *args;
PyObject *kwds;
} methodcallerobject;
static PyTypeObject methodcaller_type;
static PyObject *
methodcaller_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
methodcallerobject *mc;
PyObject *name, *newargs;
if (PyTuple_GET_SIZE(args) < 1) {
PyErr_SetString(PyExc_TypeError, "methodcaller needs at least "
"one argument, the method name");
return NULL;
}
/* create methodcallerobject structure */
mc = PyObject_GC_New(methodcallerobject, &methodcaller_type);
if (mc == NULL)
return NULL;
newargs = PyTuple_GetSlice(args, 1, PyTuple_GET_SIZE(args));
if (newargs == NULL) {
Py_DECREF(mc);
return NULL;
}
mc->args = newargs;
name = PyTuple_GET_ITEM(args, 0);
Py_INCREF(name);
mc->name = name;
Py_XINCREF(kwds);
mc->kwds = kwds;
PyObject_GC_Track(mc);
return (PyObject *)mc;
}
static void
methodcaller_dealloc(methodcallerobject *mc)
{
PyObject_GC_UnTrack(mc);
Py_XDECREF(mc->name);
Py_XDECREF(mc->args);
Py_XDECREF(mc->kwds);
PyObject_GC_Del(mc);
}
static int
methodcaller_traverse(methodcallerobject *mc, visitproc visit, void *arg)
{
Py_VISIT(mc->args);
Py_VISIT(mc->kwds);
return 0;
}
static PyObject *
methodcaller_call(methodcallerobject *mc, PyObject *args, PyObject *kw)
{
PyObject *method, *obj, *result;
if (!PyArg_UnpackTuple(args, "methodcaller", 1, 1, &obj))
return NULL;
method = PyObject_GetAttr(obj, mc->name);
if (method == NULL)
return NULL;
result = PyObject_Call(method, mc->args, mc->kwds);
Py_DECREF(method);
return result;
}
PyDoc_STRVAR(methodcaller_doc,
"methodcaller(name, ...) --> methodcaller object\n\
\n\
Return a callable object that calls the given method on its operand.\n\
After, f = methodcaller('name'), the call f(r) returns r.name().\n\
After, g = methodcaller('name', 'date', foo=1), the call g(r) returns\n\
r.name('date', foo=1).");
static PyTypeObject methodcaller_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"operator.methodcaller", /* tp_name */
sizeof(methodcallerobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)methodcaller_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
(ternaryfunc)methodcaller_call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
methodcaller_doc, /* tp_doc */
(traverseproc)methodcaller_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
methodcaller_new, /* tp_new */
0, /* tp_free */
};
/* Initialization function for the module (*must* be called PyInit_operator) */
static struct PyModuleDef operatormodule = {
PyModuleDef_HEAD_INIT,
"operator",
operator_doc,
-1,
operator_methods,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit_operator(void)
{
PyObject *m;
/* Create the module and add the functions */
m = PyModule_Create(&operatormodule);
if (m == NULL)
return NULL;
if (PyType_Ready(&itemgetter_type) < 0)
return NULL;
Py_INCREF(&itemgetter_type);
PyModule_AddObject(m, "itemgetter", (PyObject *)&itemgetter_type);
if (PyType_Ready(&attrgetter_type) < 0)
return NULL;
Py_INCREF(&attrgetter_type);
PyModule_AddObject(m, "attrgetter", (PyObject *)&attrgetter_type);
if (PyType_Ready(&methodcaller_type) < 0)
return NULL;
Py_INCREF(&methodcaller_type);
PyModule_AddObject(m, "methodcaller", (PyObject *)&methodcaller_type);
return m;
}
View Git Blame Copy Permalink