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constant.c

/* 
 * $Id: constant.c,v 1.9 2004/09/25 20:30:40 stiv Exp $
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * This is a new part of Blender.
 *
 * Contributor(s): Willian P. Germano
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
*/

#include "constant.h"

/* This file is heavily based on the old bpython Constant object code in 
   Blender */

/*****************************************************************************/
/* Python constant_Type callback function prototypes:                        */
/*****************************************************************************/
static void constant_dealloc( BPy_constant * cam );
static PyObject *constant_getAttr( BPy_constant * cam, char *name );
static PyObject *constant_repr( BPy_constant * cam );
static int constantLength( BPy_constant * self );
static PyObject *constantSubscript( BPy_constant * self, PyObject * key );
static int constantAssSubscript( BPy_constant * self, PyObject * who,
                         PyObject * cares );

/*****************************************************************************/
/* Python constant_Type Mapping Methods table:                               */
/*****************************************************************************/
static PyMappingMethods constantAsMapping = {
      ( inquiry ) constantLength,   /* mp_length        */
      ( binaryfunc ) constantSubscript,   /* mp_subscript     */
      ( objobjargproc ) constantAssSubscript,   /* mp_ass_subscript */
};

/*****************************************************************************/
/* Python constant_Type structure definition:                                */
/*****************************************************************************/
PyTypeObject constant_Type = {
      PyObject_HEAD_INIT( NULL ) 
      0,    /* ob_size */
      "Blender constant",     /* tp_name */
      sizeof( BPy_constant ), /* tp_basicsize */
      0,                /* tp_itemsize */
      /* methods */
      ( destructor ) constant_dealloc,    /* tp_dealloc */
      0,                /* tp_print */
      ( getattrfunc ) constant_getAttr,   /* tp_getattr */
      0,                /* tp_setattr */
      0,                /* tp_compare */
      ( reprfunc ) constant_repr,   /* tp_repr */
      0,                /* tp_as_number */
      0,                /* tp_as_sequence */
      &constantAsMapping,     /* tp_as_mapping */
      0,                /* tp_as_hash */
      0, 0, 0, 0, 0, 0,
      0,                /* tp_doc */
      0, 0, 0, 0, 0, 0,
      0,                /* tp_methods */
      0,                /* tp_members */
};

/*****************************************************************************/
/* Function:              constant_New                                       */
/*****************************************************************************/
static PyObject *new_const( void );

PyObject *M_constant_New( void )
{                       /* can't be static, we call it in other files */
      return new_const(  );
}

static PyObject *new_const( void )
{                       /* this is the static one */
      BPy_constant *constant;

      constant_Type.ob_type = &PyType_Type;

      constant =
            ( BPy_constant * ) PyObject_NEW( BPy_constant,
                                     &constant_Type );

      if( constant == NULL )
            return ( EXPP_ReturnPyObjError( PyExc_MemoryError,
                                    "couldn't create constant object" ) );

      if( ( constant->dict = PyDict_New(  ) ) == NULL )
            return ( EXPP_ReturnPyObjError( PyExc_MemoryError,
                                    "couldn't create constant object's dictionary" ) );

      return ( PyObject * ) constant;
}

/*****************************************************************************/
/* Python BPy_constant methods:                                              */
/*****************************************************************************/
int constant_insert( BPy_constant * self, char *name, PyObject * value )
{
      return PyDict_SetItemString( self->dict, name, value );
}

/*****************************************************************************/
/* Function:    constant_dealloc                                             */
/* Description: This is a callback function for the BPy_constant type. It is */
/*              the destructor function.                                     */
/*****************************************************************************/
static void constant_dealloc( BPy_constant * self )
{
      Py_DECREF( self->dict );
      PyObject_DEL( self );
}

/*****************************************************************************/
/* Function:    constant_getAttr                                             */
/* Description: This is a callback function for the BPy_constant type. It is */
/*              the function that accesses BPy_constant member variables and */
/*              methods.                                                     */
/*****************************************************************************/
static PyObject *constant_getAttr( BPy_constant * self, char *name )
{
      if( self->dict ) {
            PyObject *v;

            if( !strcmp( name, "__members__" ) )
                  return PyDict_Keys( self->dict );

            v = PyDict_GetItemString( self->dict, name );
            if( v ) {
                  Py_INCREF( v );   /* was a borrowed ref */
                  return v;
            }

            return ( EXPP_ReturnPyObjError( PyExc_AttributeError,
                                    "attribute not found" ) );
      }
      return ( EXPP_ReturnPyObjError( PyExc_RuntimeError,
                              "constant object lacks a dictionary" ) );
}

/*****************************************************************************/
/* Section:    Sequence Mapping                                              */
/*             These functions provide code to access constant objects as    */
/*             mappings.                                                     */
/*****************************************************************************/
static int constantLength( BPy_constant * self )
{
      return 0;
}

static PyObject *constantSubscript( BPy_constant * self, PyObject * key )
{
      if( self->dict ) {
            PyObject *v = PyDict_GetItem( self->dict, key );

            if( v ) {
                  Py_INCREF( v );
                  return v;
            }
      }

      return NULL;
}

static int constantAssSubscript( BPy_constant * self, PyObject * who,
                         PyObject * cares )
{
      /* no user assignments allowed */
      return 0;
}

/*****************************************************************************/
/* Function:    constant_repr                                                */
/* Description: This is a callback function for the BPy_constant type. It    */
/*              builds a meaninful string to represent constant objects.     */
/*****************************************************************************/
static PyObject *constant_repr( BPy_constant * self )
{
      PyObject *repr = PyObject_Repr( self->dict );
      return repr;
}

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