operator.c

#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 class 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 PyInt_FromLong(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(isCallable       , PyCallable_Check)
spami(isNumberType     , PyNumber_Check)
spami(truth            , PyObject_IsTrue)
spam2(op_add           , PyNumber_Add)
spam2(op_sub           , PyNumber_Subtract)
spam2(op_mul           , PyNumber_Multiply)
spam2(op_div           , PyNumber_Divide)
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)
spami(isSequenceType   , PySequence_Check)
spam2(op_concat        , PySequence_Concat)
spamoi(op_repeat       , PySequence_Repeat)
spami2b(op_contains     , PySequence_Contains)
spami2b(sequenceIncludes, PySequence_Contains)
spami2(indexOf         , PySequence_Index)
spami2(countOf         , PySequence_Count)
spami(isMappingType    , PyMapping_Check)
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*
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;
}

static PyObject*
op_getslice(PyObject *s, PyObject *a)
{
        PyObject *a1;
        int a2,a3;

        if (!PyArg_ParseTuple(a,"Oii:getslice",&a1,&a2,&a3))
                return NULL;
        return PySequence_GetSlice(a1,a2,a3);
}

static PyObject*
op_setslice(PyObject *s, PyObject *a)
{
        PyObject *a1, *a4;
        int a2,a3;

        if (!PyArg_ParseTuple(a,"OiiO:setslice",&a1,&a2,&a3,&a4))
                return NULL;

        if (-1 == PySequence_SetSlice(a1,a2,a3,a4))
                return NULL;

        Py_INCREF(Py_None);
        return Py_None;
}

static PyObject*
op_delslice(PyObject *s, PyObject *a)
{
        PyObject *a1;
        int a2,a3;

        if(! PyArg_ParseTuple(a,"Oii:delslice",&a1,&a2,&a3))
                return NULL;

        if (-1 == PySequence_DelSlice(a1,a2,a3))
                return NULL;

        Py_INCREF(Py_None);
        return Py_None;
}

#undef spam1
#undef spam2
#undef spam1o
#undef spam1o
#define spam1(OP,DOC) {#OP, OP, METH_VARARGS, PyDoc_STR(DOC)},
#define spam2(OP,ALTOP,DOC) {#OP, op_##OP, METH_VARARGS, 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, DOC}, \
			   {#ALTOP, op_##OP, METH_O, PyDoc_STR(DOC)}, 

static struct PyMethodDef operator_methods[] = {

spam1o(isCallable,
 "isCallable(a) -- Same as callable(a).")
spam1o(isNumberType,
 "isNumberType(a) -- Return True if a has a numeric type, False otherwise.")
spam1o(isSequenceType,
 "isSequenceType(a) -- Return True if a has a sequence type, False otherwise.")
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(sequenceIncludes,
 "sequenceIncludes(a, b) -- Same as b in a (note reversed operands; deprecated).")
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.")
spam1o(isMappingType,
 "isMappingType(a) -- Return True if a has a mapping type, False otherwise.")

spam1(is_, "is_(a, b) -- Same as a is b.")
spam1(is_not, "is_not(a, b) -- Same as a is not b.")
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(div,__div__, "div(a, b) -- Same as a / b when __future__.division is not in effect.")
spam2(floordiv,__floordiv__, "floordiv(a, b) -- Same as a // b.")
spam2(truediv,__truediv__, "truediv(a, b) -- Same as a / b when __future__.division is in effect.")
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(concat,__concat__,
 "concat(a, b) -- Same as a + b, for a and b sequences.")
spam2(repeat,__repeat__,
 "repeat(a, b) -- Return a * b, where a is a sequence, and b is an integer.")
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(getslice,__getslice__,
 "getslice(a, b, c) -- Same as a[b:c].")
spam2(setslice,__setslice__,
"setslice(a, b, c, d) -- Same as a[b:c] = d.")
spam2(delslice,__delslice__,
"delslice(a, b, c) -- Same as del a[b:c].")
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.")

	{NULL,		NULL}		/* sentinel */

};

/* itemgetter object **********************************************************/

typedef struct {
	PyObject_HEAD
	int nitems;
	PyObject *item;
} itemgetterobject;

static PyTypeObject itemgetter_type;

static PyObject *
itemgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	itemgetterobject *ig;
	PyObject *item;
	int nitems;

	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)
{
	if (ig->item)
		return visit(ig->item, arg);
	return 0;
}

static PyObject *
itemgetter_call(itemgetterobject *ig, PyObject *args, PyObject *kw)
{
	PyObject *obj, *result;
	int 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 = {
	PyObject_HEAD_INIT(NULL)
	0,				/* ob_size */
	"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_compare */
	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
	int nattrs;
	PyObject *attr;
} attrgetterobject;

static PyTypeObject attrgetter_type;

static PyObject *
attrgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	attrgetterobject *ag;
	PyObject *attr;
	int nattrs;

	nattrs = PyTuple_GET_SIZE(args);
	if (nattrs <= 1) {
		if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &attr))
			return NULL;
	} else 
		attr = args;

	/* create attrgetterobject structure */
	ag = PyObject_GC_New(attrgetterobject, &attrgetter_type);
	if (ag == NULL) 
		return NULL;	
	
	Py_INCREF(attr);
	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)
{
	if (ag->attr)
		return visit(ag->attr, arg);
	return 0;
}

static PyObject *
attrgetter_call(attrgetterobject *ag, PyObject *args, PyObject *kw)
{
	PyObject *obj, *result;
	int i, nattrs=ag->nattrs;

	if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &obj))
		return NULL;
	if (ag->nattrs == 1)
		return PyObject_GetAttr(obj, ag->attr);

	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 = PyObject_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).");

static PyTypeObject attrgetter_type = {
	PyObject_HEAD_INIT(NULL)
	0,				/* ob_size */
	"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_compare */
	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 */
};
/* Initialization function for the module (*must* be called initoperator) */

PyMODINIT_FUNC
initoperator(void)
{
	PyObject *m;
        
	/* Create the module and add the functions */
        m = Py_InitModule4("operator", operator_methods, operator_doc,
		       (PyObject*)NULL, PYTHON_API_VERSION);

	if (PyType_Ready(&itemgetter_type) < 0)
		return;
	Py_INCREF(&itemgetter_type);
	PyModule_AddObject(m, "itemgetter", (PyObject *)&itemgetter_type);

	if (PyType_Ready(&attrgetter_type) < 0)
		return;
	Py_INCREF(&attrgetter_type);
	PyModule_AddObject(m, "attrgetter", (PyObject *)&attrgetter_type);
}