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1 /* Boolean type, a subtype of int */ |
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2 |
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3 #include "Python.h" |
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4 |
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5 /* We need to define bool_print to override int_print */ |
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6 |
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7 static int |
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8 bool_print(PyBoolObject *self, FILE *fp, int flags) |
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9 { |
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10 Py_BEGIN_ALLOW_THREADS |
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11 fputs(self->ob_ival == 0 ? "False" : "True", fp); |
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12 Py_END_ALLOW_THREADS |
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13 return 0; |
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14 } |
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15 |
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16 /* We define bool_repr to return "False" or "True" */ |
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17 |
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18 static PyObject *false_str = NULL; |
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19 static PyObject *true_str = NULL; |
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20 |
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21 static PyObject * |
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22 bool_repr(PyBoolObject *self) |
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23 { |
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24 PyObject *s; |
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25 |
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26 if (self->ob_ival) |
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27 s = true_str ? true_str : |
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28 (true_str = PyString_InternFromString("True")); |
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29 else |
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30 s = false_str ? false_str : |
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31 (false_str = PyString_InternFromString("False")); |
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32 Py_XINCREF(s); |
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33 return s; |
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34 } |
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35 |
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36 /* Function to return a bool from a C long */ |
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37 |
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38 PyObject *PyBool_FromLong(long ok) |
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39 { |
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40 PyObject *result; |
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41 |
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42 if (ok) |
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43 result = Py_True; |
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44 else |
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45 result = Py_False; |
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46 Py_INCREF(result); |
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47 return result; |
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48 } |
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49 |
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50 /* We define bool_new to always return either Py_True or Py_False */ |
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51 |
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52 static PyObject * |
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53 bool_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
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54 { |
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55 static char *kwlist[] = {"x", 0}; |
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56 PyObject *x = Py_False; |
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57 long ok; |
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58 |
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59 if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:bool", kwlist, &x)) |
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60 return NULL; |
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61 ok = PyObject_IsTrue(x); |
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62 if (ok < 0) |
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63 return NULL; |
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64 return PyBool_FromLong(ok); |
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65 } |
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66 |
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67 /* Arithmetic operations redefined to return bool if both args are bool. */ |
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68 |
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69 static PyObject * |
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70 bool_and(PyObject *a, PyObject *b) |
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71 { |
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72 if (!PyBool_Check(a) || !PyBool_Check(b)) |
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73 return PyInt_Type.tp_as_number->nb_and(a, b); |
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74 return PyBool_FromLong( |
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75 ((PyBoolObject *)a)->ob_ival & ((PyBoolObject *)b)->ob_ival); |
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76 } |
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77 |
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78 static PyObject * |
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79 bool_or(PyObject *a, PyObject *b) |
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80 { |
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81 if (!PyBool_Check(a) || !PyBool_Check(b)) |
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82 return PyInt_Type.tp_as_number->nb_or(a, b); |
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83 return PyBool_FromLong( |
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84 ((PyBoolObject *)a)->ob_ival | ((PyBoolObject *)b)->ob_ival); |
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85 } |
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86 |
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87 static PyObject * |
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88 bool_xor(PyObject *a, PyObject *b) |
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89 { |
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90 if (!PyBool_Check(a) || !PyBool_Check(b)) |
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91 return PyInt_Type.tp_as_number->nb_xor(a, b); |
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92 return PyBool_FromLong( |
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93 ((PyBoolObject *)a)->ob_ival ^ ((PyBoolObject *)b)->ob_ival); |
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94 } |
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95 |
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96 /* Doc string */ |
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97 |
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98 PyDoc_STRVAR(bool_doc, |
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99 "bool(x) -> bool\n\ |
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100 \n\ |
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101 Returns True when the argument x is true, False otherwise.\n\ |
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102 The builtins True and False are the only two instances of the class bool.\n\ |
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103 The class bool is a subclass of the class int, and cannot be subclassed."); |
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104 |
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105 /* Arithmetic methods -- only so we can override &, |, ^. */ |
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106 |
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107 static PyNumberMethods bool_as_number = { |
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108 0, /* nb_add */ |
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109 0, /* nb_subtract */ |
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110 0, /* nb_multiply */ |
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111 0, /* nb_divide */ |
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112 0, /* nb_remainder */ |
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113 0, /* nb_divmod */ |
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114 0, /* nb_power */ |
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115 0, /* nb_negative */ |
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116 0, /* nb_positive */ |
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117 0, /* nb_absolute */ |
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118 0, /* nb_nonzero */ |
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119 0, /* nb_invert */ |
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120 0, /* nb_lshift */ |
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121 0, /* nb_rshift */ |
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122 bool_and, /* nb_and */ |
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123 bool_xor, /* nb_xor */ |
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124 bool_or, /* nb_or */ |
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125 0, /* nb_coerce */ |
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126 0, /* nb_int */ |
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127 0, /* nb_long */ |
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128 0, /* nb_float */ |
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129 0, /* nb_oct */ |
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130 0, /* nb_hex */ |
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131 0, /* nb_inplace_add */ |
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132 0, /* nb_inplace_subtract */ |
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133 0, /* nb_inplace_multiply */ |
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134 0, /* nb_inplace_divide */ |
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135 0, /* nb_inplace_remainder */ |
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136 0, /* nb_inplace_power */ |
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137 0, /* nb_inplace_lshift */ |
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138 0, /* nb_inplace_rshift */ |
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139 0, /* nb_inplace_and */ |
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140 0, /* nb_inplace_xor */ |
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141 0, /* nb_inplace_or */ |
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142 0, /* nb_floor_divide */ |
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143 0, /* nb_true_divide */ |
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144 0, /* nb_inplace_floor_divide */ |
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145 0, /* nb_inplace_true_divide */ |
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146 }; |
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147 |
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148 /* The type object for bool. Note that this cannot be subclassed! */ |
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149 |
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150 PyTypeObject PyBool_Type = { |
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151 PyVarObject_HEAD_INIT(&PyType_Type, 0) |
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152 "bool", |
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153 sizeof(PyIntObject), |
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154 0, |
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155 0, /* tp_dealloc */ |
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156 (printfunc)bool_print, /* tp_print */ |
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157 0, /* tp_getattr */ |
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158 0, /* tp_setattr */ |
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159 0, /* tp_compare */ |
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160 (reprfunc)bool_repr, /* tp_repr */ |
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161 &bool_as_number, /* tp_as_number */ |
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162 0, /* tp_as_sequence */ |
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163 0, /* tp_as_mapping */ |
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164 0, /* tp_hash */ |
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165 0, /* tp_call */ |
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166 (reprfunc)bool_repr, /* tp_str */ |
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167 0, /* tp_getattro */ |
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168 0, /* tp_setattro */ |
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169 0, /* tp_as_buffer */ |
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170 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES, /* tp_flags */ |
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171 bool_doc, /* tp_doc */ |
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172 0, /* tp_traverse */ |
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173 0, /* tp_clear */ |
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174 0, /* tp_richcompare */ |
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175 0, /* tp_weaklistoffset */ |
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176 0, /* tp_iter */ |
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177 0, /* tp_iternext */ |
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178 0, /* tp_methods */ |
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179 0, /* tp_members */ |
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180 0, /* tp_getset */ |
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181 &PyInt_Type, /* tp_base */ |
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182 0, /* tp_dict */ |
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183 0, /* tp_descr_get */ |
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184 0, /* tp_descr_set */ |
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185 0, /* tp_dictoffset */ |
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186 0, /* tp_init */ |
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187 0, /* tp_alloc */ |
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188 bool_new, /* tp_new */ |
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189 }; |
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190 |
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191 /* The objects representing bool values False and True */ |
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192 |
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193 /* Named Zero for link-level compatibility */ |
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194 PyIntObject _Py_ZeroStruct = { |
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195 PyObject_HEAD_INIT(&PyBool_Type) |
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196 0 |
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197 }; |
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198 |
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199 PyIntObject _Py_TrueStruct = { |
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200 PyObject_HEAD_INIT(&PyBool_Type) |
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201 1 |
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202 }; |