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16256
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1 /* Cell object implementation */
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2
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3 #include "Python.h"
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4
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5 PyObject *
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6 PyCell_New(PyObject *obj)
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7 {
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8 PyCellObject *op;
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9
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10 op = (PyCellObject *)PyObject_New(PyCellObject, &PyCell_Type);
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11 op->ob_ref = obj;
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12 Py_XINCREF(obj);
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13
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14 PyObject_GC_Init(op);
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15 return (PyObject *)op;
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16 }
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17
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18 PyObject *
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19 PyCell_Get(PyObject *op)
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20 {
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21 if (!PyCell_Check(op)) {
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22 PyErr_BadInternalCall();
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23 return NULL;
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24 }
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25 Py_XINCREF(((PyCellObject*)op)->ob_ref);
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26 return PyCell_GET(op);
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27 }
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28
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29 int
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30 PyCell_Set(PyObject *op, PyObject *obj)
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31 {
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32 if (!PyCell_Check(op)) {
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33 PyErr_BadInternalCall();
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34 return -1;
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35 }
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36 Py_XDECREF(((PyCellObject*)op)->ob_ref);
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37 Py_XINCREF(obj);
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38 PyCell_SET(op, obj);
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39 return 0;
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40 }
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41
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42 static void
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43 cell_dealloc(PyCellObject *op)
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44 {
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45 PyObject_GC_Fini(op);
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46 Py_XDECREF(op->ob_ref);
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47 PyObject_Del(op);
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48 }
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49
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50 static int
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51 cell_compare(PyCellObject *a, PyCellObject *b)
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52 {
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53 if (a->ob_ref == NULL) {
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54 if (b->ob_ref == NULL)
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55 return 0;
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56 return -1;
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57 } else if (b->ob_ref == NULL)
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58 return 1;
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59 return PyObject_Compare(a->ob_ref, b->ob_ref);
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60 }
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61
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62 static PyObject *
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63 cell_repr(PyCellObject *op)
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64 {
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65 char buf[256];
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66
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67 if (op->ob_ref == NULL)
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68 sprintf(buf, "<cell at %p: empty>", op);
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69 else
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70 sprintf(buf, "<cell at %p: %.80s object at %p>",
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71 op, op->ob_ref->ob_type->tp_name, op->ob_ref);
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72 return PyString_FromString(buf);
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73 }
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74
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75 static int
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76 cell_traverse(PyCellObject *op, visitproc visit, void *arg)
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77 {
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78 if (op->ob_ref)
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79 return visit(op->ob_ref, arg);
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80 return 0;
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81 }
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82
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83 static int
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84 cell_clear(PyCellObject *op)
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85 {
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86 op->ob_ref = NULL;
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87 return 0;
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88 }
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89
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90 PyTypeObject PyCell_Type = {
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91 PyObject_HEAD_INIT(&PyType_Type)
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92 0,
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93 "cell",
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94 sizeof(PyCellObject) + PyGC_HEAD_SIZE,
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95 0,
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96 (destructor)cell_dealloc, /* tp_dealloc */
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97 0, /* tp_print */
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98 0, /* tp_getattr */
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99 0, /* tp_setattr */
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100 (cmpfunc)cell_compare, /* tp_compare */
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101 (reprfunc)cell_repr, /* tp_repr */
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102 0, /* tp_as_number */
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103 0, /* tp_as_sequence */
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104 0, /* tp_as_mapping */
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105 0, /* tp_hash */
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106 0, /* tp_call */
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107 0, /* tp_str */
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108 0, /* tp_getattro */
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109 0, /* tp_setattro */
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110 0, /* tp_as_buffer */
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111 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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112 0, /* tp_doc */
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113 (traverseproc)cell_traverse, /* tp_traverse */
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114 (inquiry)cell_clear, /* tp_clear */
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115 };
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