Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/attr/_funcs.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from __future__ import absolute_import, division, print_function |
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2 |
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3 import copy |
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4 |
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5 from ._compat import iteritems |
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6 from ._make import NOTHING, _obj_setattr, fields |
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7 from .exceptions import AttrsAttributeNotFoundError |
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8 |
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9 |
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10 def asdict( |
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11 inst, |
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12 recurse=True, |
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13 filter=None, |
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14 dict_factory=dict, |
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15 retain_collection_types=False, |
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16 value_serializer=None, |
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17 ): |
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18 """ |
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19 Return the ``attrs`` attribute values of *inst* as a dict. |
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20 |
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21 Optionally recurse into other ``attrs``-decorated classes. |
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22 |
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23 :param inst: Instance of an ``attrs``-decorated class. |
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24 :param bool recurse: Recurse into classes that are also |
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25 ``attrs``-decorated. |
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26 :param callable filter: A callable whose return code determines whether an |
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27 attribute or element is included (``True``) or dropped (``False``). Is |
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28 called with the `attr.Attribute` as the first argument and the |
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29 value as the second argument. |
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30 :param callable dict_factory: A callable to produce dictionaries from. For |
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31 example, to produce ordered dictionaries instead of normal Python |
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32 dictionaries, pass in ``collections.OrderedDict``. |
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33 :param bool retain_collection_types: Do not convert to ``list`` when |
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34 encountering an attribute whose type is ``tuple`` or ``set``. Only |
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35 meaningful if ``recurse`` is ``True``. |
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36 :param Optional[callable] value_serializer: A hook that is called for every |
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37 attribute or dict key/value. It receives the current instance, field |
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38 and value and must return the (updated) value. The hook is run *after* |
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39 the optional *filter* has been applied. |
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40 |
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41 :rtype: return type of *dict_factory* |
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42 |
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43 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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44 class. |
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45 |
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46 .. versionadded:: 16.0.0 *dict_factory* |
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47 .. versionadded:: 16.1.0 *retain_collection_types* |
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48 .. versionadded:: 20.3.0 *value_serializer* |
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49 """ |
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50 attrs = fields(inst.__class__) |
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51 rv = dict_factory() |
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52 for a in attrs: |
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53 v = getattr(inst, a.name) |
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54 if filter is not None and not filter(a, v): |
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55 continue |
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56 |
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57 if value_serializer is not None: |
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58 v = value_serializer(inst, a, v) |
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59 |
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60 if recurse is True: |
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61 if has(v.__class__): |
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62 rv[a.name] = asdict( |
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63 v, |
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64 True, |
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65 filter, |
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66 dict_factory, |
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67 retain_collection_types, |
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68 value_serializer, |
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69 ) |
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70 elif isinstance(v, (tuple, list, set, frozenset)): |
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71 cf = v.__class__ if retain_collection_types is True else list |
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72 rv[a.name] = cf( |
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73 [ |
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74 _asdict_anything( |
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75 i, |
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76 filter, |
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77 dict_factory, |
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78 retain_collection_types, |
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79 value_serializer, |
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80 ) |
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81 for i in v |
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82 ] |
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83 ) |
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84 elif isinstance(v, dict): |
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85 df = dict_factory |
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86 rv[a.name] = df( |
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87 ( |
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88 _asdict_anything( |
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89 kk, |
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90 filter, |
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91 df, |
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92 retain_collection_types, |
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93 value_serializer, |
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94 ), |
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95 _asdict_anything( |
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96 vv, |
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97 filter, |
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98 df, |
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99 retain_collection_types, |
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100 value_serializer, |
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101 ), |
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102 ) |
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103 for kk, vv in iteritems(v) |
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104 ) |
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105 else: |
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106 rv[a.name] = v |
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107 else: |
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108 rv[a.name] = v |
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109 return rv |
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110 |
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111 |
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112 def _asdict_anything( |
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113 val, |
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114 filter, |
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115 dict_factory, |
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116 retain_collection_types, |
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117 value_serializer, |
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118 ): |
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119 """ |
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120 ``asdict`` only works on attrs instances, this works on anything. |
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121 """ |
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122 if getattr(val.__class__, "__attrs_attrs__", None) is not None: |
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123 # Attrs class. |
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124 rv = asdict( |
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125 val, |
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126 True, |
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127 filter, |
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128 dict_factory, |
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129 retain_collection_types, |
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130 value_serializer, |
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131 ) |
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132 elif isinstance(val, (tuple, list, set, frozenset)): |
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133 cf = val.__class__ if retain_collection_types is True else list |
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134 rv = cf( |
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135 [ |
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136 _asdict_anything( |
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137 i, |
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138 filter, |
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139 dict_factory, |
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140 retain_collection_types, |
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141 value_serializer, |
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142 ) |
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143 for i in val |
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144 ] |
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145 ) |
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146 elif isinstance(val, dict): |
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147 df = dict_factory |
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148 rv = df( |
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149 ( |
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150 _asdict_anything( |
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151 kk, filter, df, retain_collection_types, value_serializer |
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152 ), |
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153 _asdict_anything( |
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154 vv, filter, df, retain_collection_types, value_serializer |
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155 ), |
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156 ) |
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157 for kk, vv in iteritems(val) |
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158 ) |
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159 else: |
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160 rv = val |
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161 if value_serializer is not None: |
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162 rv = value_serializer(None, None, rv) |
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163 |
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164 return rv |
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165 |
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166 |
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167 def astuple( |
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168 inst, |
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169 recurse=True, |
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170 filter=None, |
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171 tuple_factory=tuple, |
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172 retain_collection_types=False, |
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173 ): |
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174 """ |
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175 Return the ``attrs`` attribute values of *inst* as a tuple. |
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176 |
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177 Optionally recurse into other ``attrs``-decorated classes. |
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178 |
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179 :param inst: Instance of an ``attrs``-decorated class. |
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180 :param bool recurse: Recurse into classes that are also |
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181 ``attrs``-decorated. |
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182 :param callable filter: A callable whose return code determines whether an |
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183 attribute or element is included (``True``) or dropped (``False``). Is |
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184 called with the `attr.Attribute` as the first argument and the |
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185 value as the second argument. |
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186 :param callable tuple_factory: A callable to produce tuples from. For |
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187 example, to produce lists instead of tuples. |
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188 :param bool retain_collection_types: Do not convert to ``list`` |
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189 or ``dict`` when encountering an attribute which type is |
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190 ``tuple``, ``dict`` or ``set``. Only meaningful if ``recurse`` is |
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191 ``True``. |
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192 |
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193 :rtype: return type of *tuple_factory* |
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194 |
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195 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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196 class. |
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197 |
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198 .. versionadded:: 16.2.0 |
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199 """ |
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200 attrs = fields(inst.__class__) |
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201 rv = [] |
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202 retain = retain_collection_types # Very long. :/ |
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203 for a in attrs: |
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204 v = getattr(inst, a.name) |
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205 if filter is not None and not filter(a, v): |
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206 continue |
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207 if recurse is True: |
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208 if has(v.__class__): |
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209 rv.append( |
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210 astuple( |
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211 v, |
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212 recurse=True, |
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213 filter=filter, |
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214 tuple_factory=tuple_factory, |
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215 retain_collection_types=retain, |
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216 ) |
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217 ) |
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218 elif isinstance(v, (tuple, list, set, frozenset)): |
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219 cf = v.__class__ if retain is True else list |
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220 rv.append( |
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221 cf( |
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222 [ |
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223 astuple( |
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224 j, |
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225 recurse=True, |
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226 filter=filter, |
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227 tuple_factory=tuple_factory, |
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228 retain_collection_types=retain, |
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229 ) |
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230 if has(j.__class__) |
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231 else j |
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232 for j in v |
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233 ] |
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234 ) |
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235 ) |
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236 elif isinstance(v, dict): |
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237 df = v.__class__ if retain is True else dict |
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238 rv.append( |
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239 df( |
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240 ( |
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241 astuple( |
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242 kk, |
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243 tuple_factory=tuple_factory, |
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244 retain_collection_types=retain, |
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245 ) |
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246 if has(kk.__class__) |
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247 else kk, |
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248 astuple( |
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249 vv, |
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250 tuple_factory=tuple_factory, |
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251 retain_collection_types=retain, |
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252 ) |
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253 if has(vv.__class__) |
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254 else vv, |
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255 ) |
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256 for kk, vv in iteritems(v) |
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257 ) |
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258 ) |
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259 else: |
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260 rv.append(v) |
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261 else: |
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262 rv.append(v) |
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263 |
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264 return rv if tuple_factory is list else tuple_factory(rv) |
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265 |
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266 |
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267 def has(cls): |
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268 """ |
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269 Check whether *cls* is a class with ``attrs`` attributes. |
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270 |
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271 :param type cls: Class to introspect. |
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272 :raise TypeError: If *cls* is not a class. |
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273 |
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274 :rtype: bool |
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275 """ |
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276 return getattr(cls, "__attrs_attrs__", None) is not None |
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277 |
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278 |
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279 def assoc(inst, **changes): |
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280 """ |
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281 Copy *inst* and apply *changes*. |
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282 |
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283 :param inst: Instance of a class with ``attrs`` attributes. |
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284 :param changes: Keyword changes in the new copy. |
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285 |
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286 :return: A copy of inst with *changes* incorporated. |
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287 |
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288 :raise attr.exceptions.AttrsAttributeNotFoundError: If *attr_name* couldn't |
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289 be found on *cls*. |
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290 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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291 class. |
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292 |
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293 .. deprecated:: 17.1.0 |
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294 Use `evolve` instead. |
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295 """ |
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296 import warnings |
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297 |
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298 warnings.warn( |
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299 "assoc is deprecated and will be removed after 2018/01.", |
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300 DeprecationWarning, |
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301 stacklevel=2, |
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302 ) |
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303 new = copy.copy(inst) |
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304 attrs = fields(inst.__class__) |
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305 for k, v in iteritems(changes): |
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306 a = getattr(attrs, k, NOTHING) |
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307 if a is NOTHING: |
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308 raise AttrsAttributeNotFoundError( |
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309 "{k} is not an attrs attribute on {cl}.".format( |
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310 k=k, cl=new.__class__ |
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311 ) |
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312 ) |
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313 _obj_setattr(new, k, v) |
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314 return new |
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315 |
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316 |
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317 def evolve(inst, **changes): |
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318 """ |
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319 Create a new instance, based on *inst* with *changes* applied. |
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320 |
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321 :param inst: Instance of a class with ``attrs`` attributes. |
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322 :param changes: Keyword changes in the new copy. |
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323 |
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324 :return: A copy of inst with *changes* incorporated. |
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325 |
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326 :raise TypeError: If *attr_name* couldn't be found in the class |
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327 ``__init__``. |
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328 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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329 class. |
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330 |
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331 .. versionadded:: 17.1.0 |
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332 """ |
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333 cls = inst.__class__ |
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334 attrs = fields(cls) |
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335 for a in attrs: |
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336 if not a.init: |
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337 continue |
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338 attr_name = a.name # To deal with private attributes. |
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339 init_name = attr_name if attr_name[0] != "_" else attr_name[1:] |
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340 if init_name not in changes: |
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341 changes[init_name] = getattr(inst, attr_name) |
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342 |
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343 return cls(**changes) |
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344 |
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345 |
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346 def resolve_types(cls, globalns=None, localns=None): |
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347 """ |
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348 Resolve any strings and forward annotations in type annotations. |
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349 |
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350 This is only required if you need concrete types in `Attribute`'s *type* |
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351 field. In other words, you don't need to resolve your types if you only |
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352 use them for static type checking. |
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353 |
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354 With no arguments, names will be looked up in the module in which the class |
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355 was created. If this is not what you want, e.g. if the name only exists |
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356 inside a method, you may pass *globalns* or *localns* to specify other |
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357 dictionaries in which to look up these names. See the docs of |
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358 `typing.get_type_hints` for more details. |
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359 |
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360 :param type cls: Class to resolve. |
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361 :param Optional[dict] globalns: Dictionary containing global variables. |
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362 :param Optional[dict] localns: Dictionary containing local variables. |
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363 |
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364 :raise TypeError: If *cls* is not a class. |
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365 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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366 class. |
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367 :raise NameError: If types cannot be resolved because of missing variables. |
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368 |
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369 :returns: *cls* so you can use this function also as a class decorator. |
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370 Please note that you have to apply it **after** `attr.s`. That means |
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371 the decorator has to come in the line **before** `attr.s`. |
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372 |
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373 .. versionadded:: 20.1.0 |
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374 """ |
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375 try: |
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376 # Since calling get_type_hints is expensive we cache whether we've |
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377 # done it already. |
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378 cls.__attrs_types_resolved__ |
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379 except AttributeError: |
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380 import typing |
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381 |
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382 hints = typing.get_type_hints(cls, globalns=globalns, localns=localns) |
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383 for field in fields(cls): |
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384 if field.name in hints: |
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385 # Since fields have been frozen we must work around it. |
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386 _obj_setattr(field, "type", hints[field.name]) |
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387 cls.__attrs_types_resolved__ = True |
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388 |
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389 # Return the class so you can use it as a decorator too. |
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390 return cls |