Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/attr/_make.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 import linecache |
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5 import sys |
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6 import threading |
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7 import uuid |
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8 import warnings |
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9 |
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10 from operator import itemgetter |
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11 |
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12 from . import _config, setters |
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13 from ._compat import ( |
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14 PY2, |
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15 PYPY, |
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16 isclass, |
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17 iteritems, |
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18 metadata_proxy, |
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19 ordered_dict, |
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20 set_closure_cell, |
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21 ) |
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22 from .exceptions import ( |
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23 DefaultAlreadySetError, |
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24 FrozenInstanceError, |
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25 NotAnAttrsClassError, |
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26 PythonTooOldError, |
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27 UnannotatedAttributeError, |
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28 ) |
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29 |
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30 |
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31 # This is used at least twice, so cache it here. |
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32 _obj_setattr = object.__setattr__ |
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33 _init_converter_pat = "__attr_converter_%s" |
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34 _init_factory_pat = "__attr_factory_{}" |
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35 _tuple_property_pat = ( |
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36 " {attr_name} = _attrs_property(_attrs_itemgetter({index}))" |
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37 ) |
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38 _classvar_prefixes = ("typing.ClassVar", "t.ClassVar", "ClassVar") |
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39 # we don't use a double-underscore prefix because that triggers |
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40 # name mangling when trying to create a slot for the field |
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41 # (when slots=True) |
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42 _hash_cache_field = "_attrs_cached_hash" |
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43 |
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44 _empty_metadata_singleton = metadata_proxy({}) |
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45 |
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46 # Unique object for unequivocal getattr() defaults. |
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47 _sentinel = object() |
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48 |
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49 |
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50 class _Nothing(object): |
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51 """ |
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52 Sentinel class to indicate the lack of a value when ``None`` is ambiguous. |
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53 |
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54 ``_Nothing`` is a singleton. There is only ever one of it. |
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55 """ |
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56 |
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57 _singleton = None |
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58 |
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59 def __new__(cls): |
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60 if _Nothing._singleton is None: |
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61 _Nothing._singleton = super(_Nothing, cls).__new__(cls) |
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62 return _Nothing._singleton |
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63 |
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64 def __repr__(self): |
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65 return "NOTHING" |
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66 |
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67 |
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68 NOTHING = _Nothing() |
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69 """ |
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70 Sentinel to indicate the lack of a value when ``None`` is ambiguous. |
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71 """ |
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72 |
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73 |
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74 class _CacheHashWrapper(int): |
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75 """ |
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76 An integer subclass that pickles / copies as None |
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77 |
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78 This is used for non-slots classes with ``cache_hash=True``, to avoid |
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79 serializing a potentially (even likely) invalid hash value. Since ``None`` |
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80 is the default value for uncalculated hashes, whenever this is copied, |
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81 the copy's value for the hash should automatically reset. |
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82 |
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83 See GH #613 for more details. |
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84 """ |
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85 |
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86 if PY2: |
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87 # For some reason `type(None)` isn't callable in Python 2, but we don't |
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88 # actually need a constructor for None objects, we just need any |
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89 # available function that returns None. |
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90 def __reduce__(self, _none_constructor=getattr, _args=(0, "", None)): |
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91 return _none_constructor, _args |
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92 |
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93 else: |
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94 |
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95 def __reduce__(self, _none_constructor=type(None), _args=()): |
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96 return _none_constructor, _args |
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97 |
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98 |
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99 def attrib( |
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100 default=NOTHING, |
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101 validator=None, |
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102 repr=True, |
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103 cmp=None, |
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104 hash=None, |
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105 init=True, |
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106 metadata=None, |
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107 type=None, |
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108 converter=None, |
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109 factory=None, |
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110 kw_only=False, |
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111 eq=None, |
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112 order=None, |
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113 on_setattr=None, |
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114 ): |
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115 """ |
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116 Create a new attribute on a class. |
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117 |
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118 .. warning:: |
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119 |
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120 Does *not* do anything unless the class is also decorated with |
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121 `attr.s`! |
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122 |
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123 :param default: A value that is used if an ``attrs``-generated ``__init__`` |
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124 is used and no value is passed while instantiating or the attribute is |
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125 excluded using ``init=False``. |
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126 |
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127 If the value is an instance of `Factory`, its callable will be |
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128 used to construct a new value (useful for mutable data types like lists |
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129 or dicts). |
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130 |
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131 If a default is not set (or set manually to `attr.NOTHING`), a value |
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132 *must* be supplied when instantiating; otherwise a `TypeError` |
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133 will be raised. |
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134 |
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135 The default can also be set using decorator notation as shown below. |
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136 |
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137 :type default: Any value |
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138 |
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139 :param callable factory: Syntactic sugar for |
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140 ``default=attr.Factory(factory)``. |
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141 |
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142 :param validator: `callable` that is called by ``attrs``-generated |
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143 ``__init__`` methods after the instance has been initialized. They |
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144 receive the initialized instance, the `Attribute`, and the |
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145 passed value. |
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146 |
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147 The return value is *not* inspected so the validator has to throw an |
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148 exception itself. |
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149 |
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150 If a `list` is passed, its items are treated as validators and must |
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151 all pass. |
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152 |
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153 Validators can be globally disabled and re-enabled using |
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154 `get_run_validators`. |
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155 |
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156 The validator can also be set using decorator notation as shown below. |
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157 |
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158 :type validator: `callable` or a `list` of `callable`\\ s. |
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159 |
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160 :param repr: Include this attribute in the generated ``__repr__`` |
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161 method. If ``True``, include the attribute; if ``False``, omit it. By |
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162 default, the built-in ``repr()`` function is used. To override how the |
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163 attribute value is formatted, pass a ``callable`` that takes a single |
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164 value and returns a string. Note that the resulting string is used |
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165 as-is, i.e. it will be used directly *instead* of calling ``repr()`` |
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166 (the default). |
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167 :type repr: a `bool` or a `callable` to use a custom function. |
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168 :param bool eq: If ``True`` (default), include this attribute in the |
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169 generated ``__eq__`` and ``__ne__`` methods that check two instances |
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170 for equality. |
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171 :param bool order: If ``True`` (default), include this attributes in the |
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172 generated ``__lt__``, ``__le__``, ``__gt__`` and ``__ge__`` methods. |
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173 :param bool cmp: Setting to ``True`` is equivalent to setting ``eq=True, |
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174 order=True``. Deprecated in favor of *eq* and *order*. |
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175 :param Optional[bool] hash: Include this attribute in the generated |
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176 ``__hash__`` method. If ``None`` (default), mirror *eq*'s value. This |
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177 is the correct behavior according the Python spec. Setting this value |
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178 to anything else than ``None`` is *discouraged*. |
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179 :param bool init: Include this attribute in the generated ``__init__`` |
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180 method. It is possible to set this to ``False`` and set a default |
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181 value. In that case this attributed is unconditionally initialized |
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182 with the specified default value or factory. |
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183 :param callable converter: `callable` that is called by |
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184 ``attrs``-generated ``__init__`` methods to convert attribute's value |
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185 to the desired format. It is given the passed-in value, and the |
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186 returned value will be used as the new value of the attribute. The |
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187 value is converted before being passed to the validator, if any. |
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188 :param metadata: An arbitrary mapping, to be used by third-party |
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189 components. See `extending_metadata`. |
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190 :param type: The type of the attribute. In Python 3.6 or greater, the |
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191 preferred method to specify the type is using a variable annotation |
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192 (see `PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_). |
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193 This argument is provided for backward compatibility. |
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194 Regardless of the approach used, the type will be stored on |
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195 ``Attribute.type``. |
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196 |
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197 Please note that ``attrs`` doesn't do anything with this metadata by |
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198 itself. You can use it as part of your own code or for |
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199 `static type checking <types>`. |
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200 :param kw_only: Make this attribute keyword-only (Python 3+) |
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201 in the generated ``__init__`` (if ``init`` is ``False``, this |
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202 parameter is ignored). |
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203 :param on_setattr: Allows to overwrite the *on_setattr* setting from |
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204 `attr.s`. If left `None`, the *on_setattr* value from `attr.s` is used. |
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205 Set to `attr.setters.NO_OP` to run **no** `setattr` hooks for this |
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206 attribute -- regardless of the setting in `attr.s`. |
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207 :type on_setattr: `callable`, or a list of callables, or `None`, or |
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208 `attr.setters.NO_OP` |
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209 |
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210 .. versionadded:: 15.2.0 *convert* |
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211 .. versionadded:: 16.3.0 *metadata* |
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212 .. versionchanged:: 17.1.0 *validator* can be a ``list`` now. |
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213 .. versionchanged:: 17.1.0 |
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214 *hash* is ``None`` and therefore mirrors *eq* by default. |
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215 .. versionadded:: 17.3.0 *type* |
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216 .. deprecated:: 17.4.0 *convert* |
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217 .. versionadded:: 17.4.0 *converter* as a replacement for the deprecated |
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218 *convert* to achieve consistency with other noun-based arguments. |
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219 .. versionadded:: 18.1.0 |
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220 ``factory=f`` is syntactic sugar for ``default=attr.Factory(f)``. |
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221 .. versionadded:: 18.2.0 *kw_only* |
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222 .. versionchanged:: 19.2.0 *convert* keyword argument removed |
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223 .. versionchanged:: 19.2.0 *repr* also accepts a custom callable. |
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224 .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01. |
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225 .. versionadded:: 19.2.0 *eq* and *order* |
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226 .. versionadded:: 20.1.0 *on_setattr* |
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227 .. versionchanged:: 20.3.0 *kw_only* backported to Python 2 |
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228 """ |
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229 eq, order = _determine_eq_order(cmp, eq, order, True) |
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230 |
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231 if hash is not None and hash is not True and hash is not False: |
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232 raise TypeError( |
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233 "Invalid value for hash. Must be True, False, or None." |
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234 ) |
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235 |
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236 if factory is not None: |
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237 if default is not NOTHING: |
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238 raise ValueError( |
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239 "The `default` and `factory` arguments are mutually " |
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240 "exclusive." |
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241 ) |
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242 if not callable(factory): |
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243 raise ValueError("The `factory` argument must be a callable.") |
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244 default = Factory(factory) |
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245 |
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246 if metadata is None: |
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247 metadata = {} |
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248 |
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249 # Apply syntactic sugar by auto-wrapping. |
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250 if isinstance(on_setattr, (list, tuple)): |
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251 on_setattr = setters.pipe(*on_setattr) |
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252 |
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253 if validator and isinstance(validator, (list, tuple)): |
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254 validator = and_(*validator) |
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255 |
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256 if converter and isinstance(converter, (list, tuple)): |
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257 converter = pipe(*converter) |
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258 |
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259 return _CountingAttr( |
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260 default=default, |
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261 validator=validator, |
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262 repr=repr, |
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263 cmp=None, |
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264 hash=hash, |
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265 init=init, |
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266 converter=converter, |
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267 metadata=metadata, |
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268 type=type, |
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269 kw_only=kw_only, |
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270 eq=eq, |
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271 order=order, |
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272 on_setattr=on_setattr, |
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273 ) |
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274 |
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275 |
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276 def _make_attr_tuple_class(cls_name, attr_names): |
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277 """ |
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278 Create a tuple subclass to hold `Attribute`s for an `attrs` class. |
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279 |
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280 The subclass is a bare tuple with properties for names. |
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281 |
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282 class MyClassAttributes(tuple): |
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283 __slots__ = () |
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284 x = property(itemgetter(0)) |
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285 """ |
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286 attr_class_name = "{}Attributes".format(cls_name) |
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287 attr_class_template = [ |
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288 "class {}(tuple):".format(attr_class_name), |
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289 " __slots__ = ()", |
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290 ] |
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291 if attr_names: |
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292 for i, attr_name in enumerate(attr_names): |
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293 attr_class_template.append( |
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294 _tuple_property_pat.format(index=i, attr_name=attr_name) |
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295 ) |
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296 else: |
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297 attr_class_template.append(" pass") |
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298 globs = {"_attrs_itemgetter": itemgetter, "_attrs_property": property} |
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299 eval(compile("\n".join(attr_class_template), "", "exec"), globs) |
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300 |
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301 return globs[attr_class_name] |
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302 |
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303 |
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304 # Tuple class for extracted attributes from a class definition. |
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305 # `base_attrs` is a subset of `attrs`. |
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306 _Attributes = _make_attr_tuple_class( |
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307 "_Attributes", |
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308 [ |
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309 # all attributes to build dunder methods for |
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310 "attrs", |
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311 # attributes that have been inherited |
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312 "base_attrs", |
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313 # map inherited attributes to their originating classes |
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314 "base_attrs_map", |
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315 ], |
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316 ) |
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317 |
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318 |
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319 def _is_class_var(annot): |
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320 """ |
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321 Check whether *annot* is a typing.ClassVar. |
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322 |
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323 The string comparison hack is used to avoid evaluating all string |
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324 annotations which would put attrs-based classes at a performance |
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325 disadvantage compared to plain old classes. |
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326 """ |
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327 return str(annot).startswith(_classvar_prefixes) |
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328 |
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329 |
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330 def _has_own_attribute(cls, attrib_name): |
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331 """ |
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332 Check whether *cls* defines *attrib_name* (and doesn't just inherit it). |
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333 |
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334 Requires Python 3. |
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335 """ |
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336 attr = getattr(cls, attrib_name, _sentinel) |
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337 if attr is _sentinel: |
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338 return False |
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339 |
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340 for base_cls in cls.__mro__[1:]: |
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341 a = getattr(base_cls, attrib_name, None) |
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342 if attr is a: |
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343 return False |
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344 |
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345 return True |
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346 |
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347 |
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348 def _get_annotations(cls): |
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349 """ |
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350 Get annotations for *cls*. |
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351 """ |
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352 if _has_own_attribute(cls, "__annotations__"): |
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353 return cls.__annotations__ |
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354 |
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355 return {} |
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356 |
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357 |
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358 def _counter_getter(e): |
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359 """ |
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360 Key function for sorting to avoid re-creating a lambda for every class. |
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361 """ |
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362 return e[1].counter |
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363 |
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364 |
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365 def _collect_base_attrs(cls, taken_attr_names): |
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366 """ |
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367 Collect attr.ibs from base classes of *cls*, except *taken_attr_names*. |
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368 """ |
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369 base_attrs = [] |
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370 base_attr_map = {} # A dictionary of base attrs to their classes. |
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371 |
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372 # Traverse the MRO and collect attributes. |
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373 for base_cls in reversed(cls.__mro__[1:-1]): |
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374 for a in getattr(base_cls, "__attrs_attrs__", []): |
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375 if a.inherited or a.name in taken_attr_names: |
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376 continue |
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377 |
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378 a = a.evolve(inherited=True) |
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379 base_attrs.append(a) |
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380 base_attr_map[a.name] = base_cls |
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381 |
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382 # For each name, only keep the freshest definition i.e. the furthest at the |
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383 # back. base_attr_map is fine because it gets overwritten with every new |
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384 # instance. |
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385 filtered = [] |
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386 seen = set() |
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387 for a in reversed(base_attrs): |
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388 if a.name in seen: |
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389 continue |
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390 filtered.insert(0, a) |
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391 seen.add(a.name) |
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392 |
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393 return filtered, base_attr_map |
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394 |
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395 |
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396 def _collect_base_attrs_broken(cls, taken_attr_names): |
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397 """ |
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398 Collect attr.ibs from base classes of *cls*, except *taken_attr_names*. |
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399 |
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400 N.B. *taken_attr_names* will be mutated. |
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401 |
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402 Adhere to the old incorrect behavior. |
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403 |
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404 Notably it collects from the front and considers inherited attributes which |
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405 leads to the buggy behavior reported in #428. |
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406 """ |
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407 base_attrs = [] |
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408 base_attr_map = {} # A dictionary of base attrs to their classes. |
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409 |
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410 # Traverse the MRO and collect attributes. |
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411 for base_cls in cls.__mro__[1:-1]: |
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412 for a in getattr(base_cls, "__attrs_attrs__", []): |
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413 if a.name in taken_attr_names: |
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414 continue |
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415 |
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416 a = a.evolve(inherited=True) |
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417 taken_attr_names.add(a.name) |
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418 base_attrs.append(a) |
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419 base_attr_map[a.name] = base_cls |
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420 |
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421 return base_attrs, base_attr_map |
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422 |
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423 |
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424 def _transform_attrs( |
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425 cls, these, auto_attribs, kw_only, collect_by_mro, field_transformer |
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426 ): |
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427 """ |
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428 Transform all `_CountingAttr`s on a class into `Attribute`s. |
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429 |
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430 If *these* is passed, use that and don't look for them on the class. |
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431 |
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432 *collect_by_mro* is True, collect them in the correct MRO order, otherwise |
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433 use the old -- incorrect -- order. See #428. |
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434 |
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435 Return an `_Attributes`. |
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436 """ |
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437 cd = cls.__dict__ |
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438 anns = _get_annotations(cls) |
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439 |
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440 if these is not None: |
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441 ca_list = [(name, ca) for name, ca in iteritems(these)] |
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442 |
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443 if not isinstance(these, ordered_dict): |
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444 ca_list.sort(key=_counter_getter) |
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445 elif auto_attribs is True: |
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446 ca_names = { |
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447 name |
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448 for name, attr in cd.items() |
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449 if isinstance(attr, _CountingAttr) |
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450 } |
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451 ca_list = [] |
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452 annot_names = set() |
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453 for attr_name, type in anns.items(): |
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454 if _is_class_var(type): |
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455 continue |
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456 annot_names.add(attr_name) |
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457 a = cd.get(attr_name, NOTHING) |
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458 |
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459 if not isinstance(a, _CountingAttr): |
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460 if a is NOTHING: |
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461 a = attrib() |
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462 else: |
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463 a = attrib(default=a) |
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464 ca_list.append((attr_name, a)) |
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465 |
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466 unannotated = ca_names - annot_names |
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467 if len(unannotated) > 0: |
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468 raise UnannotatedAttributeError( |
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469 "The following `attr.ib`s lack a type annotation: " |
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470 + ", ".join( |
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471 sorted(unannotated, key=lambda n: cd.get(n).counter) |
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472 ) |
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473 + "." |
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474 ) |
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475 else: |
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476 ca_list = sorted( |
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477 ( |
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478 (name, attr) |
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479 for name, attr in cd.items() |
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480 if isinstance(attr, _CountingAttr) |
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481 ), |
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482 key=lambda e: e[1].counter, |
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483 ) |
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484 |
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485 own_attrs = [ |
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486 Attribute.from_counting_attr( |
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487 name=attr_name, ca=ca, type=anns.get(attr_name) |
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488 ) |
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489 for attr_name, ca in ca_list |
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490 ] |
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491 |
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492 if collect_by_mro: |
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493 base_attrs, base_attr_map = _collect_base_attrs( |
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494 cls, {a.name for a in own_attrs} |
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495 ) |
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496 else: |
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497 base_attrs, base_attr_map = _collect_base_attrs_broken( |
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498 cls, {a.name for a in own_attrs} |
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499 ) |
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500 |
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501 attr_names = [a.name for a in base_attrs + own_attrs] |
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502 |
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503 AttrsClass = _make_attr_tuple_class(cls.__name__, attr_names) |
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504 |
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505 if kw_only: |
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506 own_attrs = [a.evolve(kw_only=True) for a in own_attrs] |
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507 base_attrs = [a.evolve(kw_only=True) for a in base_attrs] |
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508 |
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509 attrs = AttrsClass(base_attrs + own_attrs) |
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510 |
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511 # Mandatory vs non-mandatory attr order only matters when they are part of |
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512 # the __init__ signature and when they aren't kw_only (which are moved to |
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513 # the end and can be mandatory or non-mandatory in any order, as they will |
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514 # be specified as keyword args anyway). Check the order of those attrs: |
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515 had_default = False |
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516 for a in (a for a in attrs if a.init is not False and a.kw_only is False): |
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517 if had_default is True and a.default is NOTHING: |
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518 raise ValueError( |
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519 "No mandatory attributes allowed after an attribute with a " |
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520 "default value or factory. Attribute in question: %r" % (a,) |
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521 ) |
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522 |
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523 if had_default is False and a.default is not NOTHING: |
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524 had_default = True |
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525 |
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526 if field_transformer is not None: |
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527 attrs = field_transformer(cls, attrs) |
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528 return _Attributes((attrs, base_attrs, base_attr_map)) |
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529 |
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530 |
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531 if PYPY: |
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532 |
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533 def _frozen_setattrs(self, name, value): |
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534 """ |
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535 Attached to frozen classes as __setattr__. |
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536 """ |
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537 if isinstance(self, BaseException) and name in ( |
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538 "__cause__", |
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539 "__context__", |
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540 ): |
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541 BaseException.__setattr__(self, name, value) |
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542 return |
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543 |
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544 raise FrozenInstanceError() |
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545 |
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546 |
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547 else: |
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548 |
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549 def _frozen_setattrs(self, name, value): |
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550 """ |
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551 Attached to frozen classes as __setattr__. |
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552 """ |
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553 raise FrozenInstanceError() |
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554 |
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555 |
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556 def _frozen_delattrs(self, name): |
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557 """ |
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558 Attached to frozen classes as __delattr__. |
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559 """ |
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560 raise FrozenInstanceError() |
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561 |
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562 |
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563 class _ClassBuilder(object): |
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564 """ |
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565 Iteratively build *one* class. |
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566 """ |
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567 |
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568 __slots__ = ( |
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569 "_attr_names", |
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570 "_attrs", |
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571 "_base_attr_map", |
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572 "_base_names", |
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573 "_cache_hash", |
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574 "_cls", |
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575 "_cls_dict", |
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576 "_delete_attribs", |
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577 "_frozen", |
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578 "_has_post_init", |
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579 "_is_exc", |
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580 "_on_setattr", |
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581 "_slots", |
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582 "_weakref_slot", |
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583 "_has_own_setattr", |
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584 "_has_custom_setattr", |
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585 ) |
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586 |
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587 def __init__( |
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588 self, |
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589 cls, |
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590 these, |
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591 slots, |
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592 frozen, |
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593 weakref_slot, |
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594 getstate_setstate, |
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595 auto_attribs, |
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596 kw_only, |
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597 cache_hash, |
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598 is_exc, |
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599 collect_by_mro, |
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600 on_setattr, |
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601 has_custom_setattr, |
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602 field_transformer, |
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603 ): |
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604 attrs, base_attrs, base_map = _transform_attrs( |
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605 cls, |
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606 these, |
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607 auto_attribs, |
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608 kw_only, |
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609 collect_by_mro, |
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610 field_transformer, |
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611 ) |
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612 |
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613 self._cls = cls |
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614 self._cls_dict = dict(cls.__dict__) if slots else {} |
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615 self._attrs = attrs |
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616 self._base_names = set(a.name for a in base_attrs) |
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617 self._base_attr_map = base_map |
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618 self._attr_names = tuple(a.name for a in attrs) |
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619 self._slots = slots |
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620 self._frozen = frozen |
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621 self._weakref_slot = weakref_slot |
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622 self._cache_hash = cache_hash |
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623 self._has_post_init = bool(getattr(cls, "__attrs_post_init__", False)) |
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624 self._delete_attribs = not bool(these) |
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625 self._is_exc = is_exc |
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626 self._on_setattr = on_setattr |
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627 |
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628 self._has_custom_setattr = has_custom_setattr |
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629 self._has_own_setattr = False |
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630 |
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631 self._cls_dict["__attrs_attrs__"] = self._attrs |
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632 |
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633 if frozen: |
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634 self._cls_dict["__setattr__"] = _frozen_setattrs |
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635 self._cls_dict["__delattr__"] = _frozen_delattrs |
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636 |
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637 self._has_own_setattr = True |
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638 |
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639 if getstate_setstate: |
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640 ( |
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641 self._cls_dict["__getstate__"], |
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642 self._cls_dict["__setstate__"], |
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643 ) = self._make_getstate_setstate() |
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644 |
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645 def __repr__(self): |
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646 return "<_ClassBuilder(cls={cls})>".format(cls=self._cls.__name__) |
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647 |
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648 def build_class(self): |
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649 """ |
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650 Finalize class based on the accumulated configuration. |
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651 |
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652 Builder cannot be used after calling this method. |
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653 """ |
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654 if self._slots is True: |
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655 return self._create_slots_class() |
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656 else: |
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657 return self._patch_original_class() |
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658 |
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659 def _patch_original_class(self): |
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660 """ |
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661 Apply accumulated methods and return the class. |
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662 """ |
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663 cls = self._cls |
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664 base_names = self._base_names |
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665 |
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666 # Clean class of attribute definitions (`attr.ib()`s). |
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667 if self._delete_attribs: |
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668 for name in self._attr_names: |
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669 if ( |
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670 name not in base_names |
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671 and getattr(cls, name, _sentinel) is not _sentinel |
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672 ): |
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673 try: |
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674 delattr(cls, name) |
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675 except AttributeError: |
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676 # This can happen if a base class defines a class |
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677 # variable and we want to set an attribute with the |
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678 # same name by using only a type annotation. |
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679 pass |
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680 |
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681 # Attach our dunder methods. |
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682 for name, value in self._cls_dict.items(): |
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683 setattr(cls, name, value) |
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684 |
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685 # If we've inherited an attrs __setattr__ and don't write our own, |
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686 # reset it to object's. |
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687 if not self._has_own_setattr and getattr( |
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688 cls, "__attrs_own_setattr__", False |
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689 ): |
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690 cls.__attrs_own_setattr__ = False |
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691 |
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692 if not self._has_custom_setattr: |
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693 cls.__setattr__ = object.__setattr__ |
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694 |
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695 return cls |
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696 |
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697 def _create_slots_class(self): |
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698 """ |
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699 Build and return a new class with a `__slots__` attribute. |
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700 """ |
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701 base_names = self._base_names |
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702 cd = { |
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703 k: v |
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704 for k, v in iteritems(self._cls_dict) |
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705 if k not in tuple(self._attr_names) + ("__dict__", "__weakref__") |
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706 } |
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707 |
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708 # If our class doesn't have its own implementation of __setattr__ |
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709 # (either from the user or by us), check the bases, if one of them has |
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710 # an attrs-made __setattr__, that needs to be reset. We don't walk the |
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711 # MRO because we only care about our immediate base classes. |
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712 # XXX: This can be confused by subclassing a slotted attrs class with |
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713 # XXX: a non-attrs class and subclass the resulting class with an attrs |
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714 # XXX: class. See `test_slotted_confused` for details. For now that's |
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715 # XXX: OK with us. |
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716 if not self._has_own_setattr: |
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717 cd["__attrs_own_setattr__"] = False |
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718 |
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719 if not self._has_custom_setattr: |
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720 for base_cls in self._cls.__bases__: |
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721 if base_cls.__dict__.get("__attrs_own_setattr__", False): |
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722 cd["__setattr__"] = object.__setattr__ |
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723 break |
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724 |
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725 # Traverse the MRO to check for an existing __weakref__. |
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726 weakref_inherited = False |
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727 for base_cls in self._cls.__mro__[1:-1]: |
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728 if base_cls.__dict__.get("__weakref__", None) is not None: |
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729 weakref_inherited = True |
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730 break |
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731 |
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732 names = self._attr_names |
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733 if ( |
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734 self._weakref_slot |
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735 and "__weakref__" not in getattr(self._cls, "__slots__", ()) |
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736 and "__weakref__" not in names |
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737 and not weakref_inherited |
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738 ): |
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739 names += ("__weakref__",) |
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740 |
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741 # We only add the names of attributes that aren't inherited. |
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742 # Setting __slots__ to inherited attributes wastes memory. |
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743 slot_names = [name for name in names if name not in base_names] |
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744 if self._cache_hash: |
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745 slot_names.append(_hash_cache_field) |
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746 cd["__slots__"] = tuple(slot_names) |
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747 |
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748 qualname = getattr(self._cls, "__qualname__", None) |
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749 if qualname is not None: |
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750 cd["__qualname__"] = qualname |
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751 |
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752 # Create new class based on old class and our methods. |
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753 cls = type(self._cls)(self._cls.__name__, self._cls.__bases__, cd) |
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754 |
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755 # The following is a fix for |
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756 # https://github.com/python-attrs/attrs/issues/102. On Python 3, |
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757 # if a method mentions `__class__` or uses the no-arg super(), the |
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758 # compiler will bake a reference to the class in the method itself |
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759 # as `method.__closure__`. Since we replace the class with a |
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760 # clone, we rewrite these references so it keeps working. |
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761 for item in cls.__dict__.values(): |
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762 if isinstance(item, (classmethod, staticmethod)): |
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763 # Class- and staticmethods hide their functions inside. |
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764 # These might need to be rewritten as well. |
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765 closure_cells = getattr(item.__func__, "__closure__", None) |
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766 else: |
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767 closure_cells = getattr(item, "__closure__", None) |
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768 |
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769 if not closure_cells: # Catch None or the empty list. |
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770 continue |
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771 for cell in closure_cells: |
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772 try: |
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773 match = cell.cell_contents is self._cls |
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774 except ValueError: # ValueError: Cell is empty |
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|
775 pass |
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776 else: |
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777 if match: |
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778 set_closure_cell(cell, cls) |
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779 |
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780 return cls |
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781 |
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782 def add_repr(self, ns): |
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783 self._cls_dict["__repr__"] = self._add_method_dunders( |
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784 _make_repr(self._attrs, ns=ns) |
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785 ) |
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786 return self |
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787 |
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788 def add_str(self): |
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789 repr = self._cls_dict.get("__repr__") |
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790 if repr is None: |
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791 raise ValueError( |
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792 "__str__ can only be generated if a __repr__ exists." |
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793 ) |
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794 |
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795 def __str__(self): |
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796 return self.__repr__() |
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797 |
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798 self._cls_dict["__str__"] = self._add_method_dunders(__str__) |
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799 return self |
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800 |
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801 def _make_getstate_setstate(self): |
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802 """ |
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803 Create custom __setstate__ and __getstate__ methods. |
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804 """ |
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805 # __weakref__ is not writable. |
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806 state_attr_names = tuple( |
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807 an for an in self._attr_names if an != "__weakref__" |
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808 ) |
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809 |
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810 def slots_getstate(self): |
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811 """ |
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812 Automatically created by attrs. |
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813 """ |
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814 return tuple(getattr(self, name) for name in state_attr_names) |
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815 |
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816 hash_caching_enabled = self._cache_hash |
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817 |
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818 def slots_setstate(self, state): |
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819 """ |
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820 Automatically created by attrs. |
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821 """ |
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822 __bound_setattr = _obj_setattr.__get__(self, Attribute) |
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823 for name, value in zip(state_attr_names, state): |
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824 __bound_setattr(name, value) |
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825 |
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826 # The hash code cache is not included when the object is |
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827 # serialized, but it still needs to be initialized to None to |
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828 # indicate that the first call to __hash__ should be a cache |
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829 # miss. |
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830 if hash_caching_enabled: |
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831 __bound_setattr(_hash_cache_field, None) |
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832 |
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833 return slots_getstate, slots_setstate |
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834 |
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835 def make_unhashable(self): |
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836 self._cls_dict["__hash__"] = None |
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837 return self |
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838 |
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839 def add_hash(self): |
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840 self._cls_dict["__hash__"] = self._add_method_dunders( |
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841 _make_hash( |
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842 self._cls, |
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843 self._attrs, |
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844 frozen=self._frozen, |
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845 cache_hash=self._cache_hash, |
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846 ) |
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847 ) |
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848 |
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849 return self |
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850 |
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851 def add_init(self): |
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852 self._cls_dict["__init__"] = self._add_method_dunders( |
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853 _make_init( |
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854 self._cls, |
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855 self._attrs, |
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856 self._has_post_init, |
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857 self._frozen, |
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858 self._slots, |
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859 self._cache_hash, |
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860 self._base_attr_map, |
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861 self._is_exc, |
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862 self._on_setattr is not None |
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863 and self._on_setattr is not setters.NO_OP, |
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864 ) |
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865 ) |
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866 |
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867 return self |
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868 |
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869 def add_eq(self): |
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870 cd = self._cls_dict |
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871 |
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872 cd["__eq__"] = self._add_method_dunders( |
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873 _make_eq(self._cls, self._attrs) |
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874 ) |
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875 cd["__ne__"] = self._add_method_dunders(_make_ne()) |
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876 |
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877 return self |
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878 |
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879 def add_order(self): |
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880 cd = self._cls_dict |
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881 |
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882 cd["__lt__"], cd["__le__"], cd["__gt__"], cd["__ge__"] = ( |
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883 self._add_method_dunders(meth) |
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884 for meth in _make_order(self._cls, self._attrs) |
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885 ) |
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886 |
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887 return self |
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888 |
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889 def add_setattr(self): |
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890 if self._frozen: |
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891 return self |
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892 |
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893 sa_attrs = {} |
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894 for a in self._attrs: |
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895 on_setattr = a.on_setattr or self._on_setattr |
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896 if on_setattr and on_setattr is not setters.NO_OP: |
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897 sa_attrs[a.name] = a, on_setattr |
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898 |
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899 if not sa_attrs: |
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900 return self |
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901 |
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902 if self._has_custom_setattr: |
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903 # We need to write a __setattr__ but there already is one! |
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904 raise ValueError( |
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905 "Can't combine custom __setattr__ with on_setattr hooks." |
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906 ) |
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907 |
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908 # docstring comes from _add_method_dunders |
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909 def __setattr__(self, name, val): |
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910 try: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
911 a, hook = sa_attrs[name] |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
912 except KeyError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
913 nval = val |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
914 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
915 nval = hook(self, a, val) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
916 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
917 _obj_setattr(self, name, nval) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
918 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
919 self._cls_dict["__attrs_own_setattr__"] = True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
920 self._cls_dict["__setattr__"] = self._add_method_dunders(__setattr__) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
921 self._has_own_setattr = True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
922 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
923 return self |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
924 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
925 def _add_method_dunders(self, method): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
926 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
927 Add __module__ and __qualname__ to a *method* if possible. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
928 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
929 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
930 method.__module__ = self._cls.__module__ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
931 except AttributeError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
932 pass |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
933 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
934 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
935 method.__qualname__ = ".".join( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
936 (self._cls.__qualname__, method.__name__) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
937 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
938 except AttributeError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
939 pass |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
940 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
941 try: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
942 method.__doc__ = "Method generated by attrs for class %s." % ( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
943 self._cls.__qualname__, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
944 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
945 except AttributeError: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
946 pass |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
947 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
948 return method |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
949 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
950 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
951 _CMP_DEPRECATION = ( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
952 "The usage of `cmp` is deprecated and will be removed on or after " |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
953 "2021-06-01. Please use `eq` and `order` instead." |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
954 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
955 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
956 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
957 def _determine_eq_order(cmp, eq, order, default_eq): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
958 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
959 Validate the combination of *cmp*, *eq*, and *order*. Derive the effective |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
960 values of eq and order. If *eq* is None, set it to *default_eq*. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
961 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
962 if cmp is not None and any((eq is not None, order is not None)): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
963 raise ValueError("Don't mix `cmp` with `eq' and `order`.") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
964 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
965 # cmp takes precedence due to bw-compatibility. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
966 if cmp is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
967 warnings.warn(_CMP_DEPRECATION, DeprecationWarning, stacklevel=3) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
968 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
969 return cmp, cmp |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
970 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
971 # If left None, equality is set to the specified default and ordering |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
972 # mirrors equality. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
973 if eq is None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
974 eq = default_eq |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
975 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
976 if order is None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
977 order = eq |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
978 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
979 if eq is False and order is True: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
980 raise ValueError("`order` can only be True if `eq` is True too.") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
981 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
982 return eq, order |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
983 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
984 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
985 def _determine_whether_to_implement( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
986 cls, flag, auto_detect, dunders, default=True |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
987 ): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
988 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
989 Check whether we should implement a set of methods for *cls*. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
990 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
991 *flag* is the argument passed into @attr.s like 'init', *auto_detect* the |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
992 same as passed into @attr.s and *dunders* is a tuple of attribute names |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
993 whose presence signal that the user has implemented it themselves. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
994 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
995 Return *default* if no reason for either for or against is found. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
996 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
997 auto_detect must be False on Python 2. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
998 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
999 if flag is True or flag is False: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1000 return flag |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1001 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1002 if flag is None and auto_detect is False: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1003 return default |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1004 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1005 # Logically, flag is None and auto_detect is True here. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1006 for dunder in dunders: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1007 if _has_own_attribute(cls, dunder): |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1008 return False |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1009 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1010 return default |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1011 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1012 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1013 def attrs( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1014 maybe_cls=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1015 these=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1016 repr_ns=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1017 repr=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1018 cmp=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1019 hash=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1020 init=None, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1021 slots=False, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1022 frozen=False, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1023 weakref_slot=True, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1024 str=False, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1025 auto_attribs=False, |
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1026 kw_only=False, |
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1027 cache_hash=False, |
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1028 auto_exc=False, |
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1029 eq=None, |
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1030 order=None, |
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1031 auto_detect=False, |
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1032 collect_by_mro=False, |
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1033 getstate_setstate=None, |
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1034 on_setattr=None, |
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1035 field_transformer=None, |
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1036 ): |
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1037 r""" |
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1038 A class decorator that adds `dunder |
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1039 <https://wiki.python.org/moin/DunderAlias>`_\ -methods according to the |
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1040 specified attributes using `attr.ib` or the *these* argument. |
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1041 |
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1042 :param these: A dictionary of name to `attr.ib` mappings. This is |
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1043 useful to avoid the definition of your attributes within the class body |
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1044 because you can't (e.g. if you want to add ``__repr__`` methods to |
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1045 Django models) or don't want to. |
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1046 |
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1047 If *these* is not ``None``, ``attrs`` will *not* search the class body |
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1048 for attributes and will *not* remove any attributes from it. |
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1049 |
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1050 If *these* is an ordered dict (`dict` on Python 3.6+, |
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1051 `collections.OrderedDict` otherwise), the order is deduced from |
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1052 the order of the attributes inside *these*. Otherwise the order |
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1053 of the definition of the attributes is used. |
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1054 |
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1055 :type these: `dict` of `str` to `attr.ib` |
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1056 |
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1057 :param str repr_ns: When using nested classes, there's no way in Python 2 |
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1058 to automatically detect that. Therefore it's possible to set the |
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1059 namespace explicitly for a more meaningful ``repr`` output. |
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1060 :param bool auto_detect: Instead of setting the *init*, *repr*, *eq*, |
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1061 *order*, and *hash* arguments explicitly, assume they are set to |
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1062 ``True`` **unless any** of the involved methods for one of the |
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1063 arguments is implemented in the *current* class (i.e. it is *not* |
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1064 inherited from some base class). |
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1065 |
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1066 So for example by implementing ``__eq__`` on a class yourself, |
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1067 ``attrs`` will deduce ``eq=False`` and won't create *neither* |
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1068 ``__eq__`` *nor* ``__ne__`` (but Python classes come with a sensible |
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1069 ``__ne__`` by default, so it *should* be enough to only implement |
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1070 ``__eq__`` in most cases). |
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1071 |
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1072 .. warning:: |
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1073 |
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1074 If you prevent ``attrs`` from creating the ordering methods for you |
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1075 (``order=False``, e.g. by implementing ``__le__``), it becomes |
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1076 *your* responsibility to make sure its ordering is sound. The best |
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1077 way is to use the `functools.total_ordering` decorator. |
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1078 |
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1079 |
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1080 Passing ``True`` or ``False`` to *init*, *repr*, *eq*, *order*, |
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1081 *cmp*, or *hash* overrides whatever *auto_detect* would determine. |
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1082 |
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1083 *auto_detect* requires Python 3. Setting it ``True`` on Python 2 raises |
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1084 a `PythonTooOldError`. |
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1085 |
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1086 :param bool repr: Create a ``__repr__`` method with a human readable |
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1087 representation of ``attrs`` attributes.. |
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1088 :param bool str: Create a ``__str__`` method that is identical to |
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1089 ``__repr__``. This is usually not necessary except for |
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1090 `Exception`\ s. |
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1091 :param Optional[bool] eq: If ``True`` or ``None`` (default), add ``__eq__`` |
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1092 and ``__ne__`` methods that check two instances for equality. |
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1093 |
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1094 They compare the instances as if they were tuples of their ``attrs`` |
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1095 attributes if and only if the types of both classes are *identical*! |
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1096 :param Optional[bool] order: If ``True``, add ``__lt__``, ``__le__``, |
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1097 ``__gt__``, and ``__ge__`` methods that behave like *eq* above and |
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1098 allow instances to be ordered. If ``None`` (default) mirror value of |
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1099 *eq*. |
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1100 :param Optional[bool] cmp: Setting to ``True`` is equivalent to setting |
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1101 ``eq=True, order=True``. Deprecated in favor of *eq* and *order*, has |
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1102 precedence over them for backward-compatibility though. Must not be |
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1103 mixed with *eq* or *order*. |
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1104 :param Optional[bool] hash: If ``None`` (default), the ``__hash__`` method |
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1105 is generated according how *eq* and *frozen* are set. |
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1106 |
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1107 1. If *both* are True, ``attrs`` will generate a ``__hash__`` for you. |
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1108 2. If *eq* is True and *frozen* is False, ``__hash__`` will be set to |
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1109 None, marking it unhashable (which it is). |
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1110 3. If *eq* is False, ``__hash__`` will be left untouched meaning the |
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1111 ``__hash__`` method of the base class will be used (if base class is |
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1112 ``object``, this means it will fall back to id-based hashing.). |
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1113 |
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1114 Although not recommended, you can decide for yourself and force |
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1115 ``attrs`` to create one (e.g. if the class is immutable even though you |
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1116 didn't freeze it programmatically) by passing ``True`` or not. Both of |
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1117 these cases are rather special and should be used carefully. |
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1118 |
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1119 See our documentation on `hashing`, Python's documentation on |
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1120 `object.__hash__`, and the `GitHub issue that led to the default \ |
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1121 behavior <https://github.com/python-attrs/attrs/issues/136>`_ for more |
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1122 details. |
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1123 :param bool init: Create a ``__init__`` method that initializes the |
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1124 ``attrs`` attributes. Leading underscores are stripped for the |
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1125 argument name. If a ``__attrs_post_init__`` method exists on the |
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1126 class, it will be called after the class is fully initialized. |
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1127 :param bool slots: Create a `slotted class <slotted classes>` that's more |
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1128 memory-efficient. Slotted classes are generally superior to the default |
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1129 dict classes, but have some gotchas you should know about, so we |
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1130 encourage you to read the `glossary entry <slotted classes>`. |
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1131 :param bool frozen: Make instances immutable after initialization. If |
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1132 someone attempts to modify a frozen instance, |
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1133 `attr.exceptions.FrozenInstanceError` is raised. |
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1134 |
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1135 .. note:: |
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1136 |
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1137 1. This is achieved by installing a custom ``__setattr__`` method |
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1138 on your class, so you can't implement your own. |
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1139 |
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1140 2. True immutability is impossible in Python. |
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1141 |
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1142 3. This *does* have a minor a runtime performance `impact |
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1143 <how-frozen>` when initializing new instances. In other words: |
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1144 ``__init__`` is slightly slower with ``frozen=True``. |
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1145 |
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1146 4. If a class is frozen, you cannot modify ``self`` in |
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1147 ``__attrs_post_init__`` or a self-written ``__init__``. You can |
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1148 circumvent that limitation by using |
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1149 ``object.__setattr__(self, "attribute_name", value)``. |
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1150 |
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1151 5. Subclasses of a frozen class are frozen too. |
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1152 |
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1153 :param bool weakref_slot: Make instances weak-referenceable. This has no |
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1154 effect unless ``slots`` is also enabled. |
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1155 :param bool auto_attribs: If ``True``, collect `PEP 526`_-annotated |
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1156 attributes (Python 3.6 and later only) from the class body. |
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1157 |
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1158 In this case, you **must** annotate every field. If ``attrs`` |
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1159 encounters a field that is set to an `attr.ib` but lacks a type |
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1160 annotation, an `attr.exceptions.UnannotatedAttributeError` is |
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1161 raised. Use ``field_name: typing.Any = attr.ib(...)`` if you don't |
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1162 want to set a type. |
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1163 |
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1164 If you assign a value to those attributes (e.g. ``x: int = 42``), that |
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1165 value becomes the default value like if it were passed using |
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1166 ``attr.ib(default=42)``. Passing an instance of `Factory` also |
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1167 works as expected. |
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1168 |
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1169 Attributes annotated as `typing.ClassVar`, and attributes that are |
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1170 neither annotated nor set to an `attr.ib` are **ignored**. |
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1171 |
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1172 .. _`PEP 526`: https://www.python.org/dev/peps/pep-0526/ |
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1173 :param bool kw_only: Make all attributes keyword-only (Python 3+) |
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1174 in the generated ``__init__`` (if ``init`` is ``False``, this |
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1175 parameter is ignored). |
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1176 :param bool cache_hash: Ensure that the object's hash code is computed |
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1177 only once and stored on the object. If this is set to ``True``, |
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1178 hashing must be either explicitly or implicitly enabled for this |
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1179 class. If the hash code is cached, avoid any reassignments of |
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1180 fields involved in hash code computation or mutations of the objects |
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1181 those fields point to after object creation. If such changes occur, |
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1182 the behavior of the object's hash code is undefined. |
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1183 :param bool auto_exc: If the class subclasses `BaseException` |
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1184 (which implicitly includes any subclass of any exception), the |
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1185 following happens to behave like a well-behaved Python exceptions |
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1186 class: |
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1187 |
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1188 - the values for *eq*, *order*, and *hash* are ignored and the |
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1189 instances compare and hash by the instance's ids (N.B. ``attrs`` will |
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1190 *not* remove existing implementations of ``__hash__`` or the equality |
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1191 methods. It just won't add own ones.), |
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1192 - all attributes that are either passed into ``__init__`` or have a |
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1193 default value are additionally available as a tuple in the ``args`` |
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1194 attribute, |
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1195 - the value of *str* is ignored leaving ``__str__`` to base classes. |
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1196 :param bool collect_by_mro: Setting this to `True` fixes the way ``attrs`` |
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1197 collects attributes from base classes. The default behavior is |
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1198 incorrect in certain cases of multiple inheritance. It should be on by |
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1199 default but is kept off for backward-compatability. |
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1200 |
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1201 See issue `#428 <https://github.com/python-attrs/attrs/issues/428>`_ for |
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1202 more details. |
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1203 |
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1204 :param Optional[bool] getstate_setstate: |
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1205 .. note:: |
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1206 This is usually only interesting for slotted classes and you should |
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1207 probably just set *auto_detect* to `True`. |
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1208 |
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1209 If `True`, ``__getstate__`` and |
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1210 ``__setstate__`` are generated and attached to the class. This is |
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1211 necessary for slotted classes to be pickleable. If left `None`, it's |
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1212 `True` by default for slotted classes and ``False`` for dict classes. |
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1213 |
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1214 If *auto_detect* is `True`, and *getstate_setstate* is left `None`, |
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1215 and **either** ``__getstate__`` or ``__setstate__`` is detected directly |
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1216 on the class (i.e. not inherited), it is set to `False` (this is usually |
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1217 what you want). |
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1218 |
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1219 :param on_setattr: A callable that is run whenever the user attempts to set |
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1220 an attribute (either by assignment like ``i.x = 42`` or by using |
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1221 `setattr` like ``setattr(i, "x", 42)``). It receives the same arguments |
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1222 as validators: the instance, the attribute that is being modified, and |
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1223 the new value. |
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1224 |
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1225 If no exception is raised, the attribute is set to the return value of |
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1226 the callable. |
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1227 |
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1228 If a list of callables is passed, they're automatically wrapped in an |
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1229 `attr.setters.pipe`. |
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1230 |
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1231 :param Optional[callable] field_transformer: |
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1232 A function that is called with the original class object and all |
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1233 fields right before ``attrs`` finalizes the class. You can use |
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1234 this, e.g., to automatically add converters or validators to |
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1235 fields based on their types. See `transform-fields` for more details. |
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1236 |
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1237 .. versionadded:: 16.0.0 *slots* |
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1238 .. versionadded:: 16.1.0 *frozen* |
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1239 .. versionadded:: 16.3.0 *str* |
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1240 .. versionadded:: 16.3.0 Support for ``__attrs_post_init__``. |
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1241 .. versionchanged:: 17.1.0 |
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1242 *hash* supports ``None`` as value which is also the default now. |
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1243 .. versionadded:: 17.3.0 *auto_attribs* |
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1244 .. versionchanged:: 18.1.0 |
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1245 If *these* is passed, no attributes are deleted from the class body. |
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1246 .. versionchanged:: 18.1.0 If *these* is ordered, the order is retained. |
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1247 .. versionadded:: 18.2.0 *weakref_slot* |
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1248 .. deprecated:: 18.2.0 |
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1249 ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now raise a |
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1250 `DeprecationWarning` if the classes compared are subclasses of |
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1251 each other. ``__eq`` and ``__ne__`` never tried to compared subclasses |
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1252 to each other. |
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1253 .. versionchanged:: 19.2.0 |
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1254 ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now do not consider |
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1255 subclasses comparable anymore. |
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1256 .. versionadded:: 18.2.0 *kw_only* |
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1257 .. versionadded:: 18.2.0 *cache_hash* |
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1258 .. versionadded:: 19.1.0 *auto_exc* |
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1259 .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01. |
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1260 .. versionadded:: 19.2.0 *eq* and *order* |
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1261 .. versionadded:: 20.1.0 *auto_detect* |
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1262 .. versionadded:: 20.1.0 *collect_by_mro* |
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1263 .. versionadded:: 20.1.0 *getstate_setstate* |
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1264 .. versionadded:: 20.1.0 *on_setattr* |
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1265 .. versionadded:: 20.3.0 *field_transformer* |
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1266 """ |
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1267 if auto_detect and PY2: |
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1268 raise PythonTooOldError( |
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1269 "auto_detect only works on Python 3 and later." |
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1270 ) |
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1271 |
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1272 eq_, order_ = _determine_eq_order(cmp, eq, order, None) |
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1273 hash_ = hash # work around the lack of nonlocal |
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1274 |
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1275 if isinstance(on_setattr, (list, tuple)): |
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1276 on_setattr = setters.pipe(*on_setattr) |
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1277 |
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1278 def wrap(cls): |
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1279 |
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1280 if getattr(cls, "__class__", None) is None: |
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1281 raise TypeError("attrs only works with new-style classes.") |
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1282 |
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1283 is_frozen = frozen or _has_frozen_base_class(cls) |
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1284 is_exc = auto_exc is True and issubclass(cls, BaseException) |
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1285 has_own_setattr = auto_detect and _has_own_attribute( |
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1286 cls, "__setattr__" |
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1287 ) |
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1288 |
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1289 if has_own_setattr and is_frozen: |
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1290 raise ValueError("Can't freeze a class with a custom __setattr__.") |
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1291 |
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1292 builder = _ClassBuilder( |
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1293 cls, |
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1294 these, |
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1295 slots, |
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1296 is_frozen, |
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1297 weakref_slot, |
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1298 _determine_whether_to_implement( |
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1299 cls, |
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1300 getstate_setstate, |
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1301 auto_detect, |
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1302 ("__getstate__", "__setstate__"), |
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1303 default=slots, |
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1304 ), |
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1305 auto_attribs, |
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1306 kw_only, |
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1307 cache_hash, |
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1308 is_exc, |
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1309 collect_by_mro, |
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1310 on_setattr, |
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1311 has_own_setattr, |
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1312 field_transformer, |
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1313 ) |
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1314 if _determine_whether_to_implement( |
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1315 cls, repr, auto_detect, ("__repr__",) |
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1316 ): |
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1317 builder.add_repr(repr_ns) |
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1318 if str is True: |
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1319 builder.add_str() |
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1320 |
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1321 eq = _determine_whether_to_implement( |
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1322 cls, eq_, auto_detect, ("__eq__", "__ne__") |
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1323 ) |
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1324 if not is_exc and eq is True: |
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1325 builder.add_eq() |
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1326 if not is_exc and _determine_whether_to_implement( |
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1327 cls, order_, auto_detect, ("__lt__", "__le__", "__gt__", "__ge__") |
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1328 ): |
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1329 builder.add_order() |
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1330 |
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1331 builder.add_setattr() |
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1332 |
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1333 if ( |
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1334 hash_ is None |
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1335 and auto_detect is True |
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1336 and _has_own_attribute(cls, "__hash__") |
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1337 ): |
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1338 hash = False |
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1339 else: |
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1340 hash = hash_ |
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1341 if hash is not True and hash is not False and hash is not None: |
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1342 # Can't use `hash in` because 1 == True for example. |
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1343 raise TypeError( |
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1344 "Invalid value for hash. Must be True, False, or None." |
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1345 ) |
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1346 elif hash is False or (hash is None and eq is False) or is_exc: |
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1347 # Don't do anything. Should fall back to __object__'s __hash__ |
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1348 # which is by id. |
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1349 if cache_hash: |
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1350 raise TypeError( |
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1351 "Invalid value for cache_hash. To use hash caching," |
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1352 " hashing must be either explicitly or implicitly " |
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1353 "enabled." |
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1354 ) |
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1355 elif hash is True or ( |
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1356 hash is None and eq is True and is_frozen is True |
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1357 ): |
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1358 # Build a __hash__ if told so, or if it's safe. |
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1359 builder.add_hash() |
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1360 else: |
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1361 # Raise TypeError on attempts to hash. |
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1362 if cache_hash: |
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1363 raise TypeError( |
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1364 "Invalid value for cache_hash. To use hash caching," |
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1365 " hashing must be either explicitly or implicitly " |
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1366 "enabled." |
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1367 ) |
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1368 builder.make_unhashable() |
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1369 |
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1370 if _determine_whether_to_implement( |
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1371 cls, init, auto_detect, ("__init__",) |
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1372 ): |
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1373 builder.add_init() |
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1374 else: |
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1375 if cache_hash: |
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1376 raise TypeError( |
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1377 "Invalid value for cache_hash. To use hash caching," |
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1378 " init must be True." |
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1379 ) |
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1380 |
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1381 return builder.build_class() |
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1382 |
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1383 # maybe_cls's type depends on the usage of the decorator. It's a class |
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1384 # if it's used as `@attrs` but ``None`` if used as `@attrs()`. |
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1385 if maybe_cls is None: |
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1386 return wrap |
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1387 else: |
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1388 return wrap(maybe_cls) |
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1389 |
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1390 |
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1391 _attrs = attrs |
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1392 """ |
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1393 Internal alias so we can use it in functions that take an argument called |
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1394 *attrs*. |
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1395 """ |
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1396 |
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1397 |
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1398 if PY2: |
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1399 |
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1400 def _has_frozen_base_class(cls): |
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1401 """ |
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1402 Check whether *cls* has a frozen ancestor by looking at its |
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1403 __setattr__. |
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1404 """ |
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1405 return ( |
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1406 getattr(cls.__setattr__, "__module__", None) |
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1407 == _frozen_setattrs.__module__ |
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1408 and cls.__setattr__.__name__ == _frozen_setattrs.__name__ |
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1409 ) |
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1410 |
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1411 |
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1412 else: |
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1413 |
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1414 def _has_frozen_base_class(cls): |
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1415 """ |
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1416 Check whether *cls* has a frozen ancestor by looking at its |
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1417 __setattr__. |
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1418 """ |
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1419 return cls.__setattr__ == _frozen_setattrs |
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1420 |
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1421 |
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1422 def _attrs_to_tuple(obj, attrs): |
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1423 """ |
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1424 Create a tuple of all values of *obj*'s *attrs*. |
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1425 """ |
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1426 return tuple(getattr(obj, a.name) for a in attrs) |
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1427 |
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|
1428 |
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1429 def _generate_unique_filename(cls, func_name): |
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1430 """ |
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1431 Create a "filename" suitable for a function being generated. |
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1432 """ |
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1433 unique_id = uuid.uuid4() |
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1434 extra = "" |
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1435 count = 1 |
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1436 |
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1437 while True: |
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1438 unique_filename = "<attrs generated {0} {1}.{2}{3}>".format( |
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1439 func_name, |
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1440 cls.__module__, |
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1441 getattr(cls, "__qualname__", cls.__name__), |
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1442 extra, |
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1443 ) |
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1444 # To handle concurrency we essentially "reserve" our spot in |
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1445 # the linecache with a dummy line. The caller can then |
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1446 # set this value correctly. |
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1447 cache_line = (1, None, (str(unique_id),), unique_filename) |
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1448 if ( |
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1449 linecache.cache.setdefault(unique_filename, cache_line) |
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1450 == cache_line |
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1451 ): |
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1452 return unique_filename |
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1453 |
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1454 # Looks like this spot is taken. Try again. |
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1455 count += 1 |
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1456 extra = "-{0}".format(count) |
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1457 |
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1458 |
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1459 def _make_hash(cls, attrs, frozen, cache_hash): |
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1460 attrs = tuple( |
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1461 a for a in attrs if a.hash is True or (a.hash is None and a.eq is True) |
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1462 ) |
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shellac
parents:
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|
1463 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
1464 tab = " " |
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|
1465 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
1466 unique_filename = _generate_unique_filename(cls, "hash") |
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shellac
parents:
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|
1467 type_hash = hash(unique_filename) |
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|
1468 |
4f3585e2f14b
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parents:
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|
1469 hash_def = "def __hash__(self" |
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parents:
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|
1470 hash_func = "hash((" |
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parents:
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|
1471 closing_braces = "))" |
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parents:
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|
1472 if not cache_hash: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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|
1473 hash_def += "):" |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
1474 else: |
4f3585e2f14b
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parents:
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|
1475 if not PY2: |
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parents:
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|
1476 hash_def += ", *" |
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|
1477 |
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parents:
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|
1478 hash_def += ( |
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|
1479 ", _cache_wrapper=" |
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parents:
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|
1480 + "__import__('attr._make')._make._CacheHashWrapper):" |
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|
1481 ) |
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|
1482 hash_func = "_cache_wrapper(" + hash_func |
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|
1483 closing_braces += ")" |
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|
1484 |
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parents:
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|
1485 method_lines = [hash_def] |
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|
1486 |
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|
1487 def append_hash_computation_lines(prefix, indent): |
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|
1488 """ |
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parents:
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|
1489 Generate the code for actually computing the hash code. |
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|
1490 Below this will either be returned directly or used to compute |
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|
1491 a value which is then cached, depending on the value of cache_hash |
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|
1492 """ |
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|
1493 |
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|
1494 method_lines.extend( |
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|
1495 [ |
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|
1496 indent + prefix + hash_func, |
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|
1497 indent + " %d," % (type_hash,), |
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1498 ] |
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1499 ) |
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|
1500 |
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|
1501 for a in attrs: |
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|
1502 method_lines.append(indent + " self.%s," % a.name) |
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|
1503 |
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|
1504 method_lines.append(indent + " " + closing_braces) |
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|
1505 |
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parents:
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|
1506 if cache_hash: |
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parents:
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|
1507 method_lines.append(tab + "if self.%s is None:" % _hash_cache_field) |
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|
1508 if frozen: |
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parents:
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|
1509 append_hash_computation_lines( |
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|
1510 "object.__setattr__(self, '%s', " % _hash_cache_field, tab * 2 |
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|
1511 ) |
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|
1512 method_lines.append(tab * 2 + ")") # close __setattr__ |
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|
1513 else: |
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|
1514 append_hash_computation_lines( |
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|
1515 "self.%s = " % _hash_cache_field, tab * 2 |
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|
1516 ) |
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|
1517 method_lines.append(tab + "return self.%s" % _hash_cache_field) |
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parents:
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|
1518 else: |
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parents:
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|
1519 append_hash_computation_lines("return ", tab) |
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shellac
parents:
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|
1520 |
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shellac
parents:
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|
1521 script = "\n".join(method_lines) |
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shellac
parents:
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|
1522 globs = {} |
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shellac
parents:
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|
1523 locs = {} |
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parents:
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|
1524 bytecode = compile(script, unique_filename, "exec") |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1525 eval(bytecode, globs, locs) |
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shellac
parents:
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|
1526 |
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shellac
parents:
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|
1527 # In order of debuggers like PDB being able to step through the code, |
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shellac
parents:
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|
1528 # we add a fake linecache entry. |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1529 linecache.cache[unique_filename] = ( |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1530 len(script), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1531 None, |
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shellac
parents:
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|
1532 script.splitlines(True), |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1533 unique_filename, |
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parents:
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changeset
|
1534 ) |
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shellac
parents:
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|
1535 |
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shellac
parents:
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|
1536 return locs["__hash__"] |
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shellac
parents:
diff
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|
1537 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1538 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1539 def _add_hash(cls, attrs): |
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shellac
parents:
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|
1540 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1541 Add a hash method to *cls*. |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1542 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1543 cls.__hash__ = _make_hash(cls, attrs, frozen=False, cache_hash=False) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1544 return cls |
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shellac
parents:
diff
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|
1545 |
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shellac
parents:
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changeset
|
1546 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1547 def _make_ne(): |
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shellac
parents:
diff
changeset
|
1548 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1549 Create __ne__ method. |
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shellac
parents:
diff
changeset
|
1550 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1551 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1552 def __ne__(self, other): |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1553 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1554 Check equality and either forward a NotImplemented or |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1555 return the result negated. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1556 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1557 result = self.__eq__(other) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1558 if result is NotImplemented: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1559 return NotImplemented |
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shellac
parents:
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|
1560 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1561 return not result |
4f3585e2f14b
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shellac
parents:
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|
1562 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1563 return __ne__ |
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shellac
parents:
diff
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|
1564 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1565 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1566 def _make_eq(cls, attrs): |
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shellac
parents:
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|
1567 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1568 Create __eq__ method for *cls* with *attrs*. |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1569 """ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1570 attrs = [a for a in attrs if a.eq] |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1571 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
1572 unique_filename = _generate_unique_filename(cls, "eq") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
1573 lines = [ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1574 "def __eq__(self, other):", |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1575 " if other.__class__ is not self.__class__:", |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1576 " return NotImplemented", |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
1577 ] |
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|
1578 # We can't just do a big self.x = other.x and... clause due to |
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|
1579 # irregularities like nan == nan is false but (nan,) == (nan,) is true. |
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|
1580 if attrs: |
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|
1581 lines.append(" return (") |
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|
1582 others = [" ) == ("] |
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|
1583 for a in attrs: |
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|
1584 lines.append(" self.%s," % (a.name,)) |
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|
1585 others.append(" other.%s," % (a.name,)) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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|
1586 |
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|
1587 lines += others + [" )"] |
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1588 else: |
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|
1589 lines.append(" return True") |
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|
1590 |
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|
1591 script = "\n".join(lines) |
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|
1592 globs = {} |
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|
1593 locs = {} |
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|
1594 bytecode = compile(script, unique_filename, "exec") |
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|
1595 eval(bytecode, globs, locs) |
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1596 |
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1597 # In order of debuggers like PDB being able to step through the code, |
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|
1598 # we add a fake linecache entry. |
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|
1599 linecache.cache[unique_filename] = ( |
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1600 len(script), |
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|
1601 None, |
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|
1602 script.splitlines(True), |
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|
1603 unique_filename, |
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|
1604 ) |
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1605 return locs["__eq__"] |
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1606 |
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1607 |
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|
1608 def _make_order(cls, attrs): |
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1609 """ |
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1610 Create ordering methods for *cls* with *attrs*. |
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1611 """ |
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1612 attrs = [a for a in attrs if a.order] |
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1613 |
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1614 def attrs_to_tuple(obj): |
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1615 """ |
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1616 Save us some typing. |
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1617 """ |
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1618 return _attrs_to_tuple(obj, attrs) |
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1619 |
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1620 def __lt__(self, other): |
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1621 """ |
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1622 Automatically created by attrs. |
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1623 """ |
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1624 if other.__class__ is self.__class__: |
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1625 return attrs_to_tuple(self) < attrs_to_tuple(other) |
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1626 |
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|
1627 return NotImplemented |
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|
1628 |
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|
1629 def __le__(self, other): |
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1630 """ |
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|
1631 Automatically created by attrs. |
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1632 """ |
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|
1633 if other.__class__ is self.__class__: |
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|
1634 return attrs_to_tuple(self) <= attrs_to_tuple(other) |
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|
1635 |
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|
1636 return NotImplemented |
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|
1637 |
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|
1638 def __gt__(self, other): |
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|
1639 """ |
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|
1640 Automatically created by attrs. |
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|
1641 """ |
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parents:
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|
1642 if other.__class__ is self.__class__: |
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|
1643 return attrs_to_tuple(self) > attrs_to_tuple(other) |
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|
1644 |
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parents:
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|
1645 return NotImplemented |
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|
1646 |
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|
1647 def __ge__(self, other): |
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|
1648 """ |
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parents:
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|
1649 Automatically created by attrs. |
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parents:
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|
1650 """ |
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|
1651 if other.__class__ is self.__class__: |
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parents:
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|
1652 return attrs_to_tuple(self) >= attrs_to_tuple(other) |
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|
1653 |
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parents:
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|
1654 return NotImplemented |
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parents:
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|
1655 |
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parents:
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|
1656 return __lt__, __le__, __gt__, __ge__ |
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|
1657 |
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|
1658 |
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shellac
parents:
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|
1659 def _add_eq(cls, attrs=None): |
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shellac
parents:
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|
1660 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1661 Add equality methods to *cls* with *attrs*. |
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parents:
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|
1662 """ |
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shellac
parents:
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|
1663 if attrs is None: |
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shellac
parents:
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|
1664 attrs = cls.__attrs_attrs__ |
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parents:
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|
1665 |
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parents:
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|
1666 cls.__eq__ = _make_eq(cls, attrs) |
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parents:
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|
1667 cls.__ne__ = _make_ne() |
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parents:
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|
1668 |
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parents:
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|
1669 return cls |
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parents:
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changeset
|
1670 |
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parents:
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|
1671 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
1672 _already_repring = threading.local() |
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|
1673 |
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parents:
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|
1674 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1675 def _make_repr(attrs, ns): |
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shellac
parents:
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|
1676 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1677 Make a repr method that includes relevant *attrs*, adding *ns* to the full |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1678 name. |
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shellac
parents:
diff
changeset
|
1679 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1680 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
1681 # Figure out which attributes to include, and which function to use to |
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shellac
parents:
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changeset
|
1682 # format them. The a.repr value can be either bool or a custom callable. |
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shellac
parents:
diff
changeset
|
1683 attr_names_with_reprs = tuple( |
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shellac
parents:
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changeset
|
1684 (a.name, repr if a.repr is True else a.repr) |
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shellac
parents:
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changeset
|
1685 for a in attrs |
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shellac
parents:
diff
changeset
|
1686 if a.repr is not False |
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parents:
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|
1687 ) |
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shellac
parents:
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|
1688 |
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shellac
parents:
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|
1689 def __repr__(self): |
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shellac
parents:
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|
1690 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
1691 Automatically created by attrs. |
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|
1692 """ |
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parents:
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|
1693 try: |
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parents:
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|
1694 working_set = _already_repring.working_set |
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|
1695 except AttributeError: |
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parents:
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|
1696 working_set = set() |
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parents:
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|
1697 _already_repring.working_set = working_set |
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parents:
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|
1698 |
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parents:
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|
1699 if id(self) in working_set: |
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parents:
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|
1700 return "..." |
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|
1701 real_cls = self.__class__ |
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parents:
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|
1702 if ns is None: |
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|
1703 qualname = getattr(real_cls, "__qualname__", None) |
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|
1704 if qualname is not None: |
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|
1705 class_name = qualname.rsplit(">.", 1)[-1] |
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|
1706 else: |
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parents:
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|
1707 class_name = real_cls.__name__ |
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|
1708 else: |
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parents:
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|
1709 class_name = ns + "." + real_cls.__name__ |
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|
1710 |
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parents:
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|
1711 # Since 'self' remains on the stack (i.e.: strongly referenced) for the |
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parents:
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|
1712 # duration of this call, it's safe to depend on id(...) stability, and |
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parents:
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|
1713 # not need to track the instance and therefore worry about properties |
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|
1714 # like weakref- or hash-ability. |
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|
1715 working_set.add(id(self)) |
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|
1716 try: |
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|
1717 result = [class_name, "("] |
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|
1718 first = True |
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|
1719 for name, attr_repr in attr_names_with_reprs: |
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|
1720 if first: |
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|
1721 first = False |
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1722 else: |
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|
1723 result.append(", ") |
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1724 result.extend( |
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1725 (name, "=", attr_repr(getattr(self, name, NOTHING))) |
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|
1726 ) |
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|
1727 return "".join(result) + ")" |
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parents:
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|
1728 finally: |
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|
1729 working_set.remove(id(self)) |
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|
1730 |
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|
1731 return __repr__ |
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|
1732 |
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|
1733 |
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|
1734 def _add_repr(cls, ns=None, attrs=None): |
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|
1735 """ |
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|
1736 Add a repr method to *cls*. |
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|
1737 """ |
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|
1738 if attrs is None: |
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|
1739 attrs = cls.__attrs_attrs__ |
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|
1740 |
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|
1741 cls.__repr__ = _make_repr(attrs, ns) |
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parents:
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1742 return cls |
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|
1743 |
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|
1744 |
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|
1745 def fields(cls): |
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1746 """ |
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|
1747 Return the tuple of ``attrs`` attributes for a class. |
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|
1748 |
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1749 The tuple also allows accessing the fields by their names (see below for |
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|
1750 examples). |
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1751 |
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1752 :param type cls: Class to introspect. |
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1753 |
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parents:
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|
1754 :raise TypeError: If *cls* is not a class. |
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parents:
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|
1755 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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parents:
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|
1756 class. |
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parents:
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|
1757 |
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parents:
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|
1758 :rtype: tuple (with name accessors) of `attr.Attribute` |
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|
1759 |
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parents:
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|
1760 .. versionchanged:: 16.2.0 Returned tuple allows accessing the fields |
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parents:
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|
1761 by name. |
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|
1762 """ |
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parents:
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|
1763 if not isclass(cls): |
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parents:
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|
1764 raise TypeError("Passed object must be a class.") |
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parents:
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|
1765 attrs = getattr(cls, "__attrs_attrs__", None) |
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|
1766 if attrs is None: |
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|
1767 raise NotAnAttrsClassError( |
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parents:
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|
1768 "{cls!r} is not an attrs-decorated class.".format(cls=cls) |
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|
1769 ) |
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1770 return attrs |
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|
1771 |
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|
1772 |
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|
1773 def fields_dict(cls): |
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|
1774 """ |
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|
1775 Return an ordered dictionary of ``attrs`` attributes for a class, whose |
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|
1776 keys are the attribute names. |
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|
1777 |
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|
1778 :param type cls: Class to introspect. |
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|
1779 |
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|
1780 :raise TypeError: If *cls* is not a class. |
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|
1781 :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` |
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|
1782 class. |
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|
1783 |
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|
1784 :rtype: an ordered dict where keys are attribute names and values are |
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|
1785 `attr.Attribute`\\ s. This will be a `dict` if it's |
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|
1786 naturally ordered like on Python 3.6+ or an |
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|
1787 :class:`~collections.OrderedDict` otherwise. |
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|
1788 |
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|
1789 .. versionadded:: 18.1.0 |
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1790 """ |
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|
1791 if not isclass(cls): |
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parents:
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|
1792 raise TypeError("Passed object must be a class.") |
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parents:
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|
1793 attrs = getattr(cls, "__attrs_attrs__", None) |
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|
1794 if attrs is None: |
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|
1795 raise NotAnAttrsClassError( |
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|
1796 "{cls!r} is not an attrs-decorated class.".format(cls=cls) |
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1797 ) |
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|
1798 return ordered_dict(((a.name, a) for a in attrs)) |
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1799 |
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parents:
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|
1800 |
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|
1801 def validate(inst): |
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1802 """ |
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|
1803 Validate all attributes on *inst* that have a validator. |
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1804 |
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1805 Leaves all exceptions through. |
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1806 |
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1807 :param inst: Instance of a class with ``attrs`` attributes. |
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1808 """ |
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1809 if _config._run_validators is False: |
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1810 return |
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1811 |
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1812 for a in fields(inst.__class__): |
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1813 v = a.validator |
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1814 if v is not None: |
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1815 v(inst, a, getattr(inst, a.name)) |
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1816 |
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1817 |
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1818 def _is_slot_cls(cls): |
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1819 return "__slots__" in cls.__dict__ |
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1820 |
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1821 |
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1822 def _is_slot_attr(a_name, base_attr_map): |
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1823 """ |
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1824 Check if the attribute name comes from a slot class. |
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1825 """ |
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1826 return a_name in base_attr_map and _is_slot_cls(base_attr_map[a_name]) |
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1827 |
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1828 |
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1829 def _make_init( |
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1830 cls, |
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1831 attrs, |
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1832 post_init, |
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1833 frozen, |
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1834 slots, |
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1835 cache_hash, |
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1836 base_attr_map, |
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1837 is_exc, |
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1838 has_global_on_setattr, |
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1839 ): |
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1840 if frozen and has_global_on_setattr: |
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1841 raise ValueError("Frozen classes can't use on_setattr.") |
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1842 |
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1843 needs_cached_setattr = cache_hash or frozen |
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1844 filtered_attrs = [] |
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1845 attr_dict = {} |
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1846 for a in attrs: |
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1847 if not a.init and a.default is NOTHING: |
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1848 continue |
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1849 |
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1850 filtered_attrs.append(a) |
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1851 attr_dict[a.name] = a |
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1852 |
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1853 if a.on_setattr is not None: |
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1854 if frozen is True: |
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1855 raise ValueError("Frozen classes can't use on_setattr.") |
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1856 |
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1857 needs_cached_setattr = True |
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1858 elif ( |
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1859 has_global_on_setattr and a.on_setattr is not setters.NO_OP |
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1860 ) or _is_slot_attr(a.name, base_attr_map): |
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1861 needs_cached_setattr = True |
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1862 |
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1863 unique_filename = _generate_unique_filename(cls, "init") |
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1864 |
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1865 script, globs, annotations = _attrs_to_init_script( |
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1866 filtered_attrs, |
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1867 frozen, |
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1868 slots, |
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1869 post_init, |
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1870 cache_hash, |
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1871 base_attr_map, |
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1872 is_exc, |
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1873 needs_cached_setattr, |
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1874 has_global_on_setattr, |
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1875 ) |
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1876 locs = {} |
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1877 bytecode = compile(script, unique_filename, "exec") |
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1878 globs.update({"NOTHING": NOTHING, "attr_dict": attr_dict}) |
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1879 |
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1880 if needs_cached_setattr: |
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1881 # Save the lookup overhead in __init__ if we need to circumvent |
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1882 # setattr hooks. |
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1883 globs["_cached_setattr"] = _obj_setattr |
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1884 |
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1885 eval(bytecode, globs, locs) |
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1886 |
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1887 # In order of debuggers like PDB being able to step through the code, |
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1888 # we add a fake linecache entry. |
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1889 linecache.cache[unique_filename] = ( |
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1890 len(script), |
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1891 None, |
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1892 script.splitlines(True), |
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1893 unique_filename, |
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1894 ) |
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1895 |
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1896 __init__ = locs["__init__"] |
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1897 __init__.__annotations__ = annotations |
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1898 |
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1899 return __init__ |
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1900 |
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1901 |
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1902 def _setattr(attr_name, value_var, has_on_setattr): |
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1903 """ |
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1904 Use the cached object.setattr to set *attr_name* to *value_var*. |
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1905 """ |
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1906 return "_setattr('%s', %s)" % (attr_name, value_var) |
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1907 |
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1908 |
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1909 def _setattr_with_converter(attr_name, value_var, has_on_setattr): |
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1910 """ |
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1911 Use the cached object.setattr to set *attr_name* to *value_var*, but run |
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1912 its converter first. |
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1913 """ |
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1914 return "_setattr('%s', %s(%s))" % ( |
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1915 attr_name, |
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1916 _init_converter_pat % (attr_name,), |
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1917 value_var, |
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1918 ) |
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1919 |
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1920 |
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1921 def _assign(attr_name, value, has_on_setattr): |
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1922 """ |
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1923 Unless *attr_name* has an on_setattr hook, use normal assignment. Otherwise |
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1924 relegate to _setattr. |
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1925 """ |
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1926 if has_on_setattr: |
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1927 return _setattr(attr_name, value, True) |
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1928 |
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1929 return "self.%s = %s" % (attr_name, value) |
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1930 |
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1931 |
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1932 def _assign_with_converter(attr_name, value_var, has_on_setattr): |
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1933 """ |
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1934 Unless *attr_name* has an on_setattr hook, use normal assignment after |
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1935 conversion. Otherwise relegate to _setattr_with_converter. |
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1936 """ |
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1937 if has_on_setattr: |
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1938 return _setattr_with_converter(attr_name, value_var, True) |
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1939 |
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1940 return "self.%s = %s(%s)" % ( |
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1941 attr_name, |
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1942 _init_converter_pat % (attr_name,), |
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1943 value_var, |
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1944 ) |
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1945 |
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1946 |
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1947 if PY2: |
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1948 |
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1949 def _unpack_kw_only_py2(attr_name, default=None): |
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1950 """ |
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1951 Unpack *attr_name* from _kw_only dict. |
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1952 """ |
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1953 if default is not None: |
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1954 arg_default = ", %s" % default |
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1955 else: |
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1956 arg_default = "" |
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1957 return "%s = _kw_only.pop('%s'%s)" % ( |
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1958 attr_name, |
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1959 attr_name, |
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1960 arg_default, |
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1961 ) |
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1962 |
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1963 def _unpack_kw_only_lines_py2(kw_only_args): |
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1964 """ |
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1965 Unpack all *kw_only_args* from _kw_only dict and handle errors. |
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1966 |
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1967 Given a list of strings "{attr_name}" and "{attr_name}={default}" |
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1968 generates list of lines of code that pop attrs from _kw_only dict and |
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1969 raise TypeError similar to builtin if required attr is missing or |
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1970 extra key is passed. |
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1971 |
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1972 >>> print("\n".join(_unpack_kw_only_lines_py2(["a", "b=42"]))) |
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1973 try: |
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1974 a = _kw_only.pop('a') |
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1975 b = _kw_only.pop('b', 42) |
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1976 except KeyError as _key_error: |
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1977 raise TypeError( |
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1978 ... |
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1979 if _kw_only: |
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1980 raise TypeError( |
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1981 ... |
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1982 """ |
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1983 lines = ["try:"] |
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1984 lines.extend( |
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1985 " " + _unpack_kw_only_py2(*arg.split("=")) |
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1986 for arg in kw_only_args |
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1987 ) |
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1988 lines += """\ |
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1989 except KeyError as _key_error: |
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1990 raise TypeError( |
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1991 '__init__() missing required keyword-only argument: %s' % _key_error |
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1992 ) |
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1993 if _kw_only: |
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1994 raise TypeError( |
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1995 '__init__() got an unexpected keyword argument %r' |
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1996 % next(iter(_kw_only)) |
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1997 ) |
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1998 """.split( |
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1999 "\n" |
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2000 ) |
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2001 return lines |
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2002 |
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2003 |
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2004 def _attrs_to_init_script( |
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2005 attrs, |
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2006 frozen, |
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2007 slots, |
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2008 post_init, |
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2009 cache_hash, |
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2010 base_attr_map, |
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2011 is_exc, |
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2012 needs_cached_setattr, |
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2013 has_global_on_setattr, |
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2014 ): |
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2015 """ |
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2016 Return a script of an initializer for *attrs* and a dict of globals. |
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2017 |
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2018 The globals are expected by the generated script. |
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2019 |
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2020 If *frozen* is True, we cannot set the attributes directly so we use |
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2021 a cached ``object.__setattr__``. |
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2022 """ |
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2023 lines = [] |
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2024 if needs_cached_setattr: |
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2025 lines.append( |
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2026 # Circumvent the __setattr__ descriptor to save one lookup per |
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2027 # assignment. |
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2028 # Note _setattr will be used again below if cache_hash is True |
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2029 "_setattr = _cached_setattr.__get__(self, self.__class__)" |
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2030 ) |
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2031 |
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2032 if frozen is True: |
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|
2033 if slots is True: |
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parents:
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changeset
|
2034 fmt_setter = _setattr |
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parents:
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|
2035 fmt_setter_with_converter = _setattr_with_converter |
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parents:
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|
2036 else: |
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parents:
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|
2037 # Dict frozen classes assign directly to __dict__. |
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|
2038 # But only if the attribute doesn't come from an ancestor slot |
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parents:
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|
2039 # class. |
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|
2040 # Note _inst_dict will be used again below if cache_hash is True |
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parents:
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|
2041 lines.append("_inst_dict = self.__dict__") |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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|
2042 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
2043 def fmt_setter(attr_name, value_var, has_on_setattr): |
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parents:
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|
2044 if _is_slot_attr(attr_name, base_attr_map): |
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parents:
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|
2045 return _setattr(attr_name, value_var, has_on_setattr) |
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parents:
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|
2046 |
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parents:
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|
2047 return "_inst_dict['%s'] = %s" % (attr_name, value_var) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2048 |
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parents:
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|
2049 def fmt_setter_with_converter( |
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parents:
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|
2050 attr_name, value_var, has_on_setattr |
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|
2051 ): |
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parents:
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|
2052 if has_on_setattr or _is_slot_attr(attr_name, base_attr_map): |
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shellac
parents:
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|
2053 return _setattr_with_converter( |
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shellac
parents:
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|
2054 attr_name, value_var, has_on_setattr |
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2055 ) |
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|
2056 |
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|
2057 return "_inst_dict['%s'] = %s(%s)" % ( |
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|
2058 attr_name, |
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|
2059 _init_converter_pat % (attr_name,), |
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|
2060 value_var, |
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|
2061 ) |
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|
2062 |
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|
2063 else: |
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2064 # Not frozen. |
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|
2065 fmt_setter = _assign |
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parents:
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|
2066 fmt_setter_with_converter = _assign_with_converter |
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|
2067 |
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|
2068 args = [] |
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|
2069 kw_only_args = [] |
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|
2070 attrs_to_validate = [] |
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parents:
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|
2071 |
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parents:
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|
2072 # This is a dictionary of names to validator and converter callables. |
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|
2073 # Injecting this into __init__ globals lets us avoid lookups. |
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|
2074 names_for_globals = {} |
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|
2075 annotations = {"return": None} |
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|
2076 |
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parents:
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|
2077 for a in attrs: |
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shellac
parents:
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|
2078 if a.validator: |
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shellac
parents:
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|
2079 attrs_to_validate.append(a) |
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|
2080 |
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|
2081 attr_name = a.name |
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|
2082 has_on_setattr = a.on_setattr is not None or ( |
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shellac
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|
2083 a.on_setattr is not setters.NO_OP and has_global_on_setattr |
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|
2084 ) |
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|
2085 arg_name = a.name.lstrip("_") |
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|
2086 |
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parents:
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|
2087 has_factory = isinstance(a.default, Factory) |
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shellac
parents:
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|
2088 if has_factory and a.default.takes_self: |
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shellac
parents:
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|
2089 maybe_self = "self" |
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parents:
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|
2090 else: |
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|
2091 maybe_self = "" |
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parents:
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|
2092 |
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shellac
parents:
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|
2093 if a.init is False: |
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shellac
parents:
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|
2094 if has_factory: |
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shellac
parents:
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|
2095 init_factory_name = _init_factory_pat.format(a.name) |
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shellac
parents:
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|
2096 if a.converter is not None: |
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shellac
parents:
diff
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|
2097 lines.append( |
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shellac
parents:
diff
changeset
|
2098 fmt_setter_with_converter( |
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shellac
parents:
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|
2099 attr_name, |
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shellac
parents:
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|
2100 init_factory_name + "(%s)" % (maybe_self,), |
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shellac
parents:
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|
2101 has_on_setattr, |
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parents:
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|
2102 ) |
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parents:
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|
2103 ) |
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shellac
parents:
diff
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|
2104 conv_name = _init_converter_pat % (a.name,) |
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shellac
parents:
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|
2105 names_for_globals[conv_name] = a.converter |
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shellac
parents:
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|
2106 else: |
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parents:
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|
2107 lines.append( |
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shellac
parents:
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|
2108 fmt_setter( |
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shellac
parents:
diff
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|
2109 attr_name, |
4f3585e2f14b
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parents:
diff
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|
2110 init_factory_name + "(%s)" % (maybe_self,), |
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shellac
parents:
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|
2111 has_on_setattr, |
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shellac
parents:
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|
2112 ) |
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parents:
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|
2113 ) |
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shellac
parents:
diff
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|
2114 names_for_globals[init_factory_name] = a.default.factory |
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shellac
parents:
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|
2115 else: |
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shellac
parents:
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|
2116 if a.converter is not None: |
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parents:
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|
2117 lines.append( |
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shellac
parents:
diff
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|
2118 fmt_setter_with_converter( |
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shellac
parents:
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|
2119 attr_name, |
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shellac
parents:
diff
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|
2120 "attr_dict['%s'].default" % (attr_name,), |
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shellac
parents:
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|
2121 has_on_setattr, |
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shellac
parents:
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|
2122 ) |
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|
2123 ) |
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shellac
parents:
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|
2124 conv_name = _init_converter_pat % (a.name,) |
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shellac
parents:
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|
2125 names_for_globals[conv_name] = a.converter |
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shellac
parents:
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|
2126 else: |
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|
2127 lines.append( |
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parents:
diff
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|
2128 fmt_setter( |
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shellac
parents:
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|
2129 attr_name, |
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shellac
parents:
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changeset
|
2130 "attr_dict['%s'].default" % (attr_name,), |
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shellac
parents:
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|
2131 has_on_setattr, |
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|
2132 ) |
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|
2133 ) |
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shellac
parents:
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|
2134 elif a.default is not NOTHING and not has_factory: |
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shellac
parents:
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|
2135 arg = "%s=attr_dict['%s'].default" % (arg_name, attr_name) |
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|
2136 if a.kw_only: |
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shellac
parents:
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|
2137 kw_only_args.append(arg) |
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|
2138 else: |
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parents:
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|
2139 args.append(arg) |
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shellac
parents:
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|
2140 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2141 if a.converter is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2142 lines.append( |
4f3585e2f14b
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shellac
parents:
diff
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|
2143 fmt_setter_with_converter( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2144 attr_name, arg_name, has_on_setattr |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2145 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2146 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2147 names_for_globals[ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2148 _init_converter_pat % (a.name,) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2149 ] = a.converter |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2150 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2151 lines.append(fmt_setter(attr_name, arg_name, has_on_setattr)) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2152 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2153 elif has_factory: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2154 arg = "%s=NOTHING" % (arg_name,) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2155 if a.kw_only: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2156 kw_only_args.append(arg) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2157 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2158 args.append(arg) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2159 lines.append("if %s is not NOTHING:" % (arg_name,)) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2160 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2161 init_factory_name = _init_factory_pat.format(a.name) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2162 if a.converter is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2163 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2164 " " |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2165 + fmt_setter_with_converter( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2166 attr_name, arg_name, has_on_setattr |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2167 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2168 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2169 lines.append("else:") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2170 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2171 " " |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2172 + fmt_setter_with_converter( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2173 attr_name, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2174 init_factory_name + "(" + maybe_self + ")", |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2175 has_on_setattr, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2176 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2177 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2178 names_for_globals[ |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2179 _init_converter_pat % (a.name,) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2180 ] = a.converter |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2181 else: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2182 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2183 " " + fmt_setter(attr_name, arg_name, has_on_setattr) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2184 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2185 lines.append("else:") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2186 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2187 " " |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2188 + fmt_setter( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2189 attr_name, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2190 init_factory_name + "(" + maybe_self + ")", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2191 has_on_setattr, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2192 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2193 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2194 names_for_globals[init_factory_name] = a.default.factory |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2195 else: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2196 if a.kw_only: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2197 kw_only_args.append(arg_name) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2198 else: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2199 args.append(arg_name) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2200 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2201 if a.converter is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2202 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2203 fmt_setter_with_converter( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2204 attr_name, arg_name, has_on_setattr |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2205 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2206 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2207 names_for_globals[ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2208 _init_converter_pat % (a.name,) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2209 ] = a.converter |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2210 else: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2211 lines.append(fmt_setter(attr_name, arg_name, has_on_setattr)) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2212 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2213 if a.init is True and a.converter is None and a.type is not None: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2214 annotations[arg_name] = a.type |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2215 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2216 if attrs_to_validate: # we can skip this if there are no validators. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2217 names_for_globals["_config"] = _config |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2218 lines.append("if _config._run_validators is True:") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2219 for a in attrs_to_validate: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2220 val_name = "__attr_validator_" + a.name |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2221 attr_name = "__attr_" + a.name |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2222 lines.append( |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2223 " %s(self, %s, self.%s)" % (val_name, attr_name, a.name) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
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|
2224 ) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
changeset
|
2225 names_for_globals[val_name] = a.validator |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2226 names_for_globals[attr_name] = a |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2227 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2228 if post_init: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2229 lines.append("self.__attrs_post_init__()") |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2230 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2231 # because this is set only after __attrs_post_init is called, a crash |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2232 # will result if post-init tries to access the hash code. This seemed |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2233 # preferable to setting this beforehand, in which case alteration to |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2234 # field values during post-init combined with post-init accessing the |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2235 # hash code would result in silent bugs. |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2236 if cache_hash: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2237 if frozen: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2238 if slots: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2239 # if frozen and slots, then _setattr defined above |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2240 init_hash_cache = "_setattr('%s', %s)" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2241 else: |
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shellac
parents:
diff
changeset
|
2242 # if frozen and not slots, then _inst_dict defined above |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2243 init_hash_cache = "_inst_dict['%s'] = %s" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2244 else: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2245 init_hash_cache = "self.%s = %s" |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2246 lines.append(init_hash_cache % (_hash_cache_field, "None")) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2247 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2248 # For exceptions we rely on BaseException.__init__ for proper |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2249 # initialization. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2250 if is_exc: |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2251 vals = ",".join("self." + a.name for a in attrs if a.init) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2252 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2253 lines.append("BaseException.__init__(self, %s)" % (vals,)) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2254 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2255 args = ", ".join(args) |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2256 if kw_only_args: |
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2257 if PY2: |
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2258 lines = _unpack_kw_only_lines_py2(kw_only_args) + lines |
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2259 |
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2260 args += "%s**_kw_only" % (", " if args else "",) # leading comma |
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2261 else: |
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2262 args += "%s*, %s" % ( |
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2263 ", " if args else "", # leading comma |
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2264 ", ".join(kw_only_args), # kw_only args |
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2265 ) |
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2266 return ( |
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2267 """\ |
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2268 def __init__(self, {args}): |
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2269 {lines} |
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2270 """.format( |
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2271 args=args, lines="\n ".join(lines) if lines else "pass" |
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2272 ), |
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2273 names_for_globals, |
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2274 annotations, |
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2275 ) |
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2276 |
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2277 |
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2278 class Attribute(object): |
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2279 """ |
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2280 *Read-only* representation of an attribute. |
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2281 |
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2282 Instances of this class are frequently used for introspection purposes |
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2283 like: |
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2284 |
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2285 - `fields` returns a tuple of them. |
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2286 - Validators get them passed as the first argument. |
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2287 - The *field transformer* hook receives a list of them. |
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2288 |
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2289 :attribute name: The name of the attribute. |
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2290 :attribute inherited: Whether or not that attribute has been inherited from |
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2291 a base class. |
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2292 |
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2293 Plus *all* arguments of `attr.ib` (except for ``factory`` |
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2294 which is only syntactic sugar for ``default=Factory(...)``. |
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2295 |
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2296 .. versionadded:: 20.1.0 *inherited* |
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2297 .. versionadded:: 20.1.0 *on_setattr* |
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2298 .. versionchanged:: 20.2.0 *inherited* is not taken into account for |
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2299 equality checks and hashing anymore. |
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2300 |
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2301 For the full version history of the fields, see `attr.ib`. |
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2302 """ |
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2303 |
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2304 __slots__ = ( |
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2305 "name", |
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2306 "default", |
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2307 "validator", |
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2308 "repr", |
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2309 "eq", |
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2310 "order", |
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2311 "hash", |
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2312 "init", |
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2313 "metadata", |
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2314 "type", |
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2315 "converter", |
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2316 "kw_only", |
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2317 "inherited", |
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2318 "on_setattr", |
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2319 ) |
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2320 |
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2321 def __init__( |
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2322 self, |
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2323 name, |
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2324 default, |
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2325 validator, |
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2326 repr, |
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2327 cmp, # XXX: unused, remove along with other cmp code. |
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2328 hash, |
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2329 init, |
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2330 inherited, |
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2331 metadata=None, |
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2332 type=None, |
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2333 converter=None, |
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2334 kw_only=False, |
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2335 eq=None, |
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2336 order=None, |
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2337 on_setattr=None, |
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2338 ): |
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2339 eq, order = _determine_eq_order(cmp, eq, order, True) |
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2340 |
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2341 # Cache this descriptor here to speed things up later. |
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2342 bound_setattr = _obj_setattr.__get__(self, Attribute) |
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2343 |
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2344 # Despite the big red warning, people *do* instantiate `Attribute` |
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2345 # themselves. |
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2346 bound_setattr("name", name) |
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2347 bound_setattr("default", default) |
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2348 bound_setattr("validator", validator) |
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2349 bound_setattr("repr", repr) |
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2350 bound_setattr("eq", eq) |
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2351 bound_setattr("order", order) |
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2352 bound_setattr("hash", hash) |
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2353 bound_setattr("init", init) |
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2354 bound_setattr("converter", converter) |
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2355 bound_setattr( |
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2356 "metadata", |
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2357 ( |
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2358 metadata_proxy(metadata) |
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2359 if metadata |
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2360 else _empty_metadata_singleton |
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2361 ), |
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2362 ) |
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2363 bound_setattr("type", type) |
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2364 bound_setattr("kw_only", kw_only) |
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2365 bound_setattr("inherited", inherited) |
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2366 bound_setattr("on_setattr", on_setattr) |
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2367 |
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2368 def __setattr__(self, name, value): |
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2369 raise FrozenInstanceError() |
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2370 |
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2371 @classmethod |
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2372 def from_counting_attr(cls, name, ca, type=None): |
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2373 # type holds the annotated value. deal with conflicts: |
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2374 if type is None: |
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2375 type = ca.type |
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2376 elif ca.type is not None: |
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2377 raise ValueError( |
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2378 "Type annotation and type argument cannot both be present" |
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2379 ) |
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2380 inst_dict = { |
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2381 k: getattr(ca, k) |
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2382 for k in Attribute.__slots__ |
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2383 if k |
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2384 not in ( |
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2385 "name", |
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2386 "validator", |
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2387 "default", |
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2388 "type", |
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2389 "inherited", |
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2390 ) # exclude methods and deprecated alias |
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2391 } |
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2392 return cls( |
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2393 name=name, |
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2394 validator=ca._validator, |
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2395 default=ca._default, |
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2396 type=type, |
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2397 cmp=None, |
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2398 inherited=False, |
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2399 **inst_dict |
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2400 ) |
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2401 |
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2402 @property |
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2403 def cmp(self): |
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2404 """ |
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2405 Simulate the presence of a cmp attribute and warn. |
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2406 """ |
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2407 warnings.warn(_CMP_DEPRECATION, DeprecationWarning, stacklevel=2) |
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2408 |
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2409 return self.eq and self.order |
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2410 |
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2411 # Don't use attr.evolve since fields(Attribute) doesn't work |
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2412 def evolve(self, **changes): |
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2413 """ |
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2414 Copy *self* and apply *changes*. |
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2415 |
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2416 This works similarly to `attr.evolve` but that function does not work |
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2417 with ``Attribute``. |
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2418 |
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2419 It is mainly meant to be used for `transform-fields`. |
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2420 |
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2421 .. versionadded:: 20.3.0 |
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2422 """ |
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2423 new = copy.copy(self) |
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2424 |
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2425 new._setattrs(changes.items()) |
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2426 |
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2427 return new |
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2428 |
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2429 # Don't use _add_pickle since fields(Attribute) doesn't work |
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2430 def __getstate__(self): |
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2431 """ |
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2432 Play nice with pickle. |
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2433 """ |
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2434 return tuple( |
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2435 getattr(self, name) if name != "metadata" else dict(self.metadata) |
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2436 for name in self.__slots__ |
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2437 ) |
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2438 |
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2439 def __setstate__(self, state): |
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2440 """ |
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2441 Play nice with pickle. |
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2442 """ |
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2443 self._setattrs(zip(self.__slots__, state)) |
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2444 |
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2445 def _setattrs(self, name_values_pairs): |
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2446 bound_setattr = _obj_setattr.__get__(self, Attribute) |
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2447 for name, value in name_values_pairs: |
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2448 if name != "metadata": |
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2449 bound_setattr(name, value) |
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2450 else: |
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2451 bound_setattr( |
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2452 name, |
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2453 metadata_proxy(value) |
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2454 if value |
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2455 else _empty_metadata_singleton, |
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2456 ) |
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2457 |
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2458 |
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2459 _a = [ |
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2460 Attribute( |
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2461 name=name, |
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2462 default=NOTHING, |
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2463 validator=None, |
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2464 repr=True, |
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2465 cmp=None, |
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2466 eq=True, |
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2467 order=False, |
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2468 hash=(name != "metadata"), |
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2469 init=True, |
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2470 inherited=False, |
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2471 ) |
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2472 for name in Attribute.__slots__ |
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2473 ] |
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2474 |
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2475 Attribute = _add_hash( |
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2476 _add_eq( |
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2477 _add_repr(Attribute, attrs=_a), |
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2478 attrs=[a for a in _a if a.name != "inherited"], |
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2479 ), |
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2480 attrs=[a for a in _a if a.hash and a.name != "inherited"], |
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2481 ) |
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2482 |
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2483 |
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2484 class _CountingAttr(object): |
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2485 """ |
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2486 Intermediate representation of attributes that uses a counter to preserve |
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2487 the order in which the attributes have been defined. |
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|
2488 |
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|
2489 *Internal* data structure of the attrs library. Running into is most |
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|
2490 likely the result of a bug like a forgotten `@attr.s` decorator. |
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|
2491 """ |
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|
2492 |
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|
2493 __slots__ = ( |
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parents:
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|
2494 "counter", |
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parents:
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|
2495 "_default", |
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|
2496 "repr", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2497 "eq", |
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parents:
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|
2498 "order", |
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parents:
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|
2499 "hash", |
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parents:
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|
2500 "init", |
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parents:
diff
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|
2501 "metadata", |
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parents:
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|
2502 "_validator", |
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parents:
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|
2503 "converter", |
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parents:
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|
2504 "type", |
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|
2505 "kw_only", |
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parents:
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|
2506 "on_setattr", |
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2507 ) |
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|
2508 __attrs_attrs__ = tuple( |
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parents:
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|
2509 Attribute( |
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parents:
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|
2510 name=name, |
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|
2511 default=NOTHING, |
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parents:
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|
2512 validator=None, |
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parents:
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|
2513 repr=True, |
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parents:
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|
2514 cmp=None, |
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parents:
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|
2515 hash=True, |
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parents:
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|
2516 init=True, |
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parents:
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|
2517 kw_only=False, |
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parents:
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|
2518 eq=True, |
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|
2519 order=False, |
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|
2520 inherited=False, |
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parents:
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|
2521 on_setattr=None, |
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|
2522 ) |
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|
2523 for name in ( |
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parents:
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|
2524 "counter", |
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parents:
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|
2525 "_default", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2526 "repr", |
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parents:
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changeset
|
2527 "eq", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2528 "order", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2529 "hash", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
2530 "init", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2531 "on_setattr", |
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parents:
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|
2532 ) |
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parents:
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|
2533 ) + ( |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
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|
2534 Attribute( |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2535 name="metadata", |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2536 default=None, |
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parents:
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|
2537 validator=None, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2538 repr=True, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2539 cmp=None, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2540 hash=False, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2541 init=True, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2542 kw_only=False, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2543 eq=True, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2544 order=False, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2545 inherited=False, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2546 on_setattr=None, |
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parents:
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|
2547 ), |
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|
2548 ) |
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parents:
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|
2549 cls_counter = 0 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2550 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2551 def __init__( |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2552 self, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2553 default, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2554 validator, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2555 repr, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2556 cmp, # XXX: unused, remove along with cmp |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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changeset
|
2557 hash, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2558 init, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
changeset
|
2559 converter, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
changeset
|
2560 metadata, |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
changeset
|
2561 type, |
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parents:
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|
2562 kw_only, |
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parents:
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|
2563 eq, |
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parents:
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|
2564 order, |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
2565 on_setattr, |
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parents:
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|
2566 ): |
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parents:
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changeset
|
2567 _CountingAttr.cls_counter += 1 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2568 self.counter = _CountingAttr.cls_counter |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2569 self._default = default |
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parents:
diff
changeset
|
2570 self._validator = validator |
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shellac
parents:
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changeset
|
2571 self.converter = converter |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
2572 self.repr = repr |
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parents:
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|
2573 self.eq = eq |
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parents:
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|
2574 self.order = order |
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parents:
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|
2575 self.hash = hash |
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parents:
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|
2576 self.init = init |
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parents:
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|
2577 self.metadata = metadata |
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parents:
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changeset
|
2578 self.type = type |
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parents:
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changeset
|
2579 self.kw_only = kw_only |
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parents:
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|
2580 self.on_setattr = on_setattr |
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parents:
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|
2581 |
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parents:
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changeset
|
2582 def validator(self, meth): |
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parents:
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|
2583 """ |
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parents:
diff
changeset
|
2584 Decorator that adds *meth* to the list of validators. |
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parents:
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|
2585 |
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parents:
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changeset
|
2586 Returns *meth* unchanged. |
4f3585e2f14b
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parents:
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changeset
|
2587 |
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parents:
diff
changeset
|
2588 .. versionadded:: 17.1.0 |
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parents:
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|
2589 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2590 if self._validator is None: |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff
changeset
|
2591 self._validator = meth |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2592 else: |
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parents:
diff
changeset
|
2593 self._validator = and_(self._validator, meth) |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2594 return meth |
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parents:
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|
2595 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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changeset
|
2596 def default(self, meth): |
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parents:
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|
2597 """ |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2598 Decorator that allows to set the default for an attribute. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
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|
2599 |
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parents:
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changeset
|
2600 Returns *meth* unchanged. |
4f3585e2f14b
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parents:
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|
2601 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
|
2602 :raises DefaultAlreadySetError: If default has been set before. |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
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|
2603 |
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shellac
parents:
diff
changeset
|
2604 .. versionadded:: 17.1.0 |
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2605 """ |
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2606 if self._default is not NOTHING: |
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2607 raise DefaultAlreadySetError() |
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2608 |
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2609 self._default = Factory(meth, takes_self=True) |
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2610 |
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2611 return meth |
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2612 |
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2613 |
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2614 _CountingAttr = _add_eq(_add_repr(_CountingAttr)) |
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2615 |
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2616 |
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2617 @attrs(slots=True, init=False, hash=True) |
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2618 class Factory(object): |
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2619 """ |
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2620 Stores a factory callable. |
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2621 |
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2622 If passed as the default value to `attr.ib`, the factory is used to |
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2623 generate a new value. |
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2624 |
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2625 :param callable factory: A callable that takes either none or exactly one |
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2626 mandatory positional argument depending on *takes_self*. |
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2627 :param bool takes_self: Pass the partially initialized instance that is |
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2628 being initialized as a positional argument. |
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2629 |
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2630 .. versionadded:: 17.1.0 *takes_self* |
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2631 """ |
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2632 |
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2633 factory = attrib() |
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2634 takes_self = attrib() |
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2635 |
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2636 def __init__(self, factory, takes_self=False): |
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2637 """ |
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2638 `Factory` is part of the default machinery so if we want a default |
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2639 value here, we have to implement it ourselves. |
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2640 """ |
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2641 self.factory = factory |
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2642 self.takes_self = takes_self |
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2643 |
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2644 |
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2645 def make_class(name, attrs, bases=(object,), **attributes_arguments): |
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2646 """ |
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2647 A quick way to create a new class called *name* with *attrs*. |
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2648 |
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2649 :param str name: The name for the new class. |
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2650 |
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2651 :param attrs: A list of names or a dictionary of mappings of names to |
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2652 attributes. |
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2653 |
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2654 If *attrs* is a list or an ordered dict (`dict` on Python 3.6+, |
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2655 `collections.OrderedDict` otherwise), the order is deduced from |
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2656 the order of the names or attributes inside *attrs*. Otherwise the |
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2657 order of the definition of the attributes is used. |
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2658 :type attrs: `list` or `dict` |
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2659 |
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2660 :param tuple bases: Classes that the new class will subclass. |
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2661 |
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2662 :param attributes_arguments: Passed unmodified to `attr.s`. |
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2663 |
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2664 :return: A new class with *attrs*. |
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2665 :rtype: type |
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2666 |
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2667 .. versionadded:: 17.1.0 *bases* |
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2668 .. versionchanged:: 18.1.0 If *attrs* is ordered, the order is retained. |
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2669 """ |
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2670 if isinstance(attrs, dict): |
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2671 cls_dict = attrs |
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2672 elif isinstance(attrs, (list, tuple)): |
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2673 cls_dict = dict((a, attrib()) for a in attrs) |
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2674 else: |
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2675 raise TypeError("attrs argument must be a dict or a list.") |
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2676 |
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2677 post_init = cls_dict.pop("__attrs_post_init__", None) |
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2678 type_ = type( |
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2679 name, |
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2680 bases, |
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2681 {} if post_init is None else {"__attrs_post_init__": post_init}, |
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2682 ) |
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2683 # For pickling to work, the __module__ variable needs to be set to the |
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2684 # frame where the class is created. Bypass this step in environments where |
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2685 # sys._getframe is not defined (Jython for example) or sys._getframe is not |
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2686 # defined for arguments greater than 0 (IronPython). |
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2687 try: |
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2688 type_.__module__ = sys._getframe(1).f_globals.get( |
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2689 "__name__", "__main__" |
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2690 ) |
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2691 except (AttributeError, ValueError): |
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2692 pass |
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2693 |
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2694 # We do it here for proper warnings with meaningful stacklevel. |
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2695 cmp = attributes_arguments.pop("cmp", None) |
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2696 ( |
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2697 attributes_arguments["eq"], |
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2698 attributes_arguments["order"], |
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2699 ) = _determine_eq_order( |
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2700 cmp, |
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2701 attributes_arguments.get("eq"), |
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2702 attributes_arguments.get("order"), |
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2703 True, |
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2704 ) |
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2705 |
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2706 return _attrs(these=cls_dict, **attributes_arguments)(type_) |
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2707 |
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2708 |
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2709 # These are required by within this module so we define them here and merely |
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2710 # import into .validators / .converters. |
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2711 |
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2712 |
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2713 @attrs(slots=True, hash=True) |
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2714 class _AndValidator(object): |
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2715 """ |
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2716 Compose many validators to a single one. |
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2717 """ |
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2718 |
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2719 _validators = attrib() |
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2720 |
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2721 def __call__(self, inst, attr, value): |
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2722 for v in self._validators: |
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2723 v(inst, attr, value) |
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2724 |
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2725 |
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2726 def and_(*validators): |
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2727 """ |
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2728 A validator that composes multiple validators into one. |
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2729 |
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2730 When called on a value, it runs all wrapped validators. |
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2731 |
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2732 :param callables validators: Arbitrary number of validators. |
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2733 |
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2734 .. versionadded:: 17.1.0 |
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2735 """ |
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2736 vals = [] |
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2737 for validator in validators: |
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2738 vals.extend( |
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2739 validator._validators |
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2740 if isinstance(validator, _AndValidator) |
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2741 else [validator] |
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2742 ) |
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2743 |
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2744 return _AndValidator(tuple(vals)) |
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2745 |
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2746 |
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2747 def pipe(*converters): |
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2748 """ |
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2749 A converter that composes multiple converters into one. |
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2750 |
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2751 When called on a value, it runs all wrapped converters, returning the |
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2752 *last* value. |
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2753 |
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2754 :param callables converters: Arbitrary number of converters. |
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2755 |
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2756 .. versionadded:: 20.1.0 |
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2757 """ |
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2758 |
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2759 def pipe_converter(val): |
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2760 for converter in converters: |
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2761 val = converter(val) |
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2762 |
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2763 return val |
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2764 |
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2765 return pipe_converter |