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|
/*-----------------------------------------------------------------------------
| Copyright (c) 2013-2019, Nucleic Development Team.
|
| Distributed under the terms of the Modified BSD License.
|
| The full license is in the file LICENSE, distributed with this software.
|----------------------------------------------------------------------------*/
#include <sstream>
#include <cppy/cppy.h>
#include "symbolics.h"
#include "types.h"
#include "util.h"
namespace kiwisolver
{
namespace
{
PyObject*
Expression_new( PyTypeObject* type, PyObject* args, PyObject* kwargs )
{
static const char *kwlist[] = { "terms", "constant", 0 };
PyObject* pyterms;
PyObject* pyconstant = 0;
if( !PyArg_ParseTupleAndKeywords(
args, kwargs, "O|O:__new__", const_cast<char**>( kwlist ),
&pyterms, &pyconstant ) )
return 0;
cppy::ptr terms( PySequence_Tuple( pyterms ) );
if( !terms )
return 0;
Py_ssize_t end = PyTuple_GET_SIZE( terms.get() );
for( Py_ssize_t i = 0; i < end; ++i )
{
PyObject* item = PyTuple_GET_ITEM( terms.get(), i );
if( !Term::TypeCheck( item ) )
return cppy::type_error( item, "Term" );
}
double constant = 0.0;
if( pyconstant && !convert_to_double( pyconstant, constant ) )
return 0;
PyObject* pyexpr = PyType_GenericNew( type, args, kwargs );
if( !pyexpr )
return 0;
Expression* self = reinterpret_cast<Expression*>( pyexpr );
self->terms = terms.release();
self->constant = constant;
return pyexpr;
}
void
Expression_clear( Expression* self )
{
Py_CLEAR( self->terms );
}
int
Expression_traverse( Expression* self, visitproc visit, void* arg )
{
Py_VISIT( self->terms );
return 0;
}
void
Expression_dealloc( Expression* self )
{
PyObject_GC_UnTrack( self );
Expression_clear( self );
Py_TYPE( self )->tp_free( pyobject_cast( self ) );
}
PyObject*
Expression_repr( Expression* self )
{
std::stringstream stream;
Py_ssize_t end = PyTuple_GET_SIZE( self->terms );
for( Py_ssize_t i = 0; i < end; ++i )
{
PyObject* item = PyTuple_GET_ITEM( self->terms, i );
Term* term = reinterpret_cast<Term*>( item );
stream << term->coefficient << " * ";
stream << reinterpret_cast<Variable*>( term->variable )->variable.name();
stream << " + ";
}
stream << self->constant;
return PyUnicode_FromString( stream.str().c_str() );
}
PyObject*
Expression_terms( Expression* self )
{
return cppy::incref( self->terms );
}
PyObject*
Expression_constant( Expression* self )
{
return PyFloat_FromDouble( self->constant );
}
PyObject*
Expression_value( Expression* self )
{
double result = self->constant;
Py_ssize_t size = PyTuple_GET_SIZE( self->terms );
for( Py_ssize_t i = 0; i < size; ++i )
{
PyObject* item = PyTuple_GET_ITEM( self->terms, i );
Term* term = reinterpret_cast<Term*>( item );
Variable* pyvar = reinterpret_cast<Variable*>( term->variable );
result += term->coefficient * pyvar->variable.value();
}
return PyFloat_FromDouble( result );
}
PyObject*
Expression_add( PyObject* first, PyObject* second )
{
return BinaryInvoke<BinaryAdd, Expression>()( first, second );
}
PyObject*
Expression_sub( PyObject* first, PyObject* second )
{
return BinaryInvoke<BinarySub, Expression>()( first, second );
}
PyObject*
Expression_mul( PyObject* first, PyObject* second )
{
return BinaryInvoke<BinaryMul, Expression>()( first, second );
}
PyObject*
Expression_div( PyObject* first, PyObject* second )
{
return BinaryInvoke<BinaryDiv, Expression>()( first, second );
}
PyObject*
Expression_neg( PyObject* value )
{
return UnaryInvoke<UnaryNeg, Expression>()( value );
}
PyObject*
Expression_richcmp( PyObject* first, PyObject* second, int op )
{
switch( op )
{
case Py_EQ:
return BinaryInvoke<CmpEQ, Expression>()( first, second );
case Py_LE:
return BinaryInvoke<CmpLE, Expression>()( first, second );
case Py_GE:
return BinaryInvoke<CmpGE, Expression>()( first, second );
default:
break;
}
PyErr_Format(
PyExc_TypeError,
"unsupported operand type(s) for %s: "
"'%.100s' and '%.100s'",
pyop_str( op ),
first->ob_type->tp_name,
second->ob_type->tp_name
);
return 0;
}
static PyMethodDef
Expression_methods[] = {
{ "terms", ( PyCFunction )Expression_terms, METH_NOARGS,
"Get the tuple of terms for the expression." },
{ "constant", ( PyCFunction )Expression_constant, METH_NOARGS,
"Get the constant for the expression." },
{ "value", ( PyCFunction )Expression_value, METH_NOARGS,
"Get the value for the expression." },
{ 0 } // sentinel
};
static PyType_Slot Expression_Type_slots[] = {
{ Py_tp_dealloc, void_cast( Expression_dealloc ) }, /* tp_dealloc */
{ Py_tp_traverse, void_cast( Expression_traverse ) }, /* tp_traverse */
{ Py_tp_clear, void_cast( Expression_clear ) }, /* tp_clear */
{ Py_tp_repr, void_cast( Expression_repr ) }, /* tp_repr */
{ Py_tp_richcompare, void_cast( Expression_richcmp ) }, /* tp_richcompare */
{ Py_tp_methods, void_cast( Expression_methods ) }, /* tp_methods */
{ Py_tp_new, void_cast( Expression_new ) }, /* tp_new */
{ Py_tp_alloc, void_cast( PyType_GenericAlloc ) }, /* tp_alloc */
{ Py_tp_free, void_cast( PyObject_GC_Del ) }, /* tp_free */
{ Py_nb_add, void_cast( Expression_add ) }, /* nb_add */
{ Py_nb_subtract, void_cast( Expression_sub ) }, /* nb_sub */
{ Py_nb_multiply, void_cast( Expression_mul ) }, /* nb_mul */
{ Py_nb_negative, void_cast( Expression_neg ) }, /* nb_neg */
{ Py_nb_true_divide, void_cast( Expression_div ) }, /* nb_div */
{ 0, 0 },
};
} // namespace
// Initialize static variables (otherwise the compiler eliminates them)
PyTypeObject* Expression::TypeObject = NULL;
PyType_Spec Expression::TypeObject_Spec = {
"kiwisolver.Expression", /* tp_name */
sizeof( Expression ), /* tp_basicsize */
0, /* tp_itemsize */
Py_TPFLAGS_DEFAULT|
Py_TPFLAGS_HAVE_GC|
Py_TPFLAGS_BASETYPE, /* tp_flags */
Expression_Type_slots /* slots */
};
bool Expression::Ready()
{
// The reference will be handled by the module to which we will add the type
TypeObject = pytype_cast( PyType_FromSpec( &TypeObject_Spec ) );
if( !TypeObject )
{
return false;
}
return true;
}
} // namesapce kiwisolver
|
