Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/attr/_compat.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 platform |
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4 import sys |
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5 import types |
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6 import warnings |
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7 |
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8 |
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9 PY2 = sys.version_info[0] == 2 |
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10 PYPY = platform.python_implementation() == "PyPy" |
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11 |
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12 |
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13 if PYPY or sys.version_info[:2] >= (3, 6): |
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14 ordered_dict = dict |
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15 else: |
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16 from collections import OrderedDict |
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17 |
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18 ordered_dict = OrderedDict |
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19 |
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20 |
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21 if PY2: |
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22 from collections import Mapping, Sequence |
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23 |
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24 from UserDict import IterableUserDict |
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25 |
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26 # We 'bundle' isclass instead of using inspect as importing inspect is |
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27 # fairly expensive (order of 10-15 ms for a modern machine in 2016) |
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28 def isclass(klass): |
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29 return isinstance(klass, (type, types.ClassType)) |
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30 |
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31 # TYPE is used in exceptions, repr(int) is different on Python 2 and 3. |
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32 TYPE = "type" |
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33 |
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34 def iteritems(d): |
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35 return d.iteritems() |
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36 |
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37 # Python 2 is bereft of a read-only dict proxy, so we make one! |
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38 class ReadOnlyDict(IterableUserDict): |
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39 """ |
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40 Best-effort read-only dict wrapper. |
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41 """ |
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42 |
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43 def __setitem__(self, key, val): |
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44 # We gently pretend we're a Python 3 mappingproxy. |
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45 raise TypeError( |
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46 "'mappingproxy' object does not support item assignment" |
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47 ) |
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48 |
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49 def update(self, _): |
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50 # We gently pretend we're a Python 3 mappingproxy. |
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51 raise AttributeError( |
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52 "'mappingproxy' object has no attribute 'update'" |
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53 ) |
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54 |
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55 def __delitem__(self, _): |
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56 # We gently pretend we're a Python 3 mappingproxy. |
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57 raise TypeError( |
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58 "'mappingproxy' object does not support item deletion" |
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59 ) |
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60 |
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61 def clear(self): |
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62 # We gently pretend we're a Python 3 mappingproxy. |
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63 raise AttributeError( |
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64 "'mappingproxy' object has no attribute 'clear'" |
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65 ) |
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66 |
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67 def pop(self, key, default=None): |
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68 # We gently pretend we're a Python 3 mappingproxy. |
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69 raise AttributeError( |
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70 "'mappingproxy' object has no attribute 'pop'" |
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71 ) |
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72 |
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73 def popitem(self): |
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74 # We gently pretend we're a Python 3 mappingproxy. |
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75 raise AttributeError( |
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76 "'mappingproxy' object has no attribute 'popitem'" |
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77 ) |
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78 |
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79 def setdefault(self, key, default=None): |
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80 # We gently pretend we're a Python 3 mappingproxy. |
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81 raise AttributeError( |
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82 "'mappingproxy' object has no attribute 'setdefault'" |
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83 ) |
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84 |
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85 def __repr__(self): |
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86 # Override to be identical to the Python 3 version. |
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87 return "mappingproxy(" + repr(self.data) + ")" |
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88 |
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89 def metadata_proxy(d): |
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90 res = ReadOnlyDict() |
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91 res.data.update(d) # We blocked update, so we have to do it like this. |
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92 return res |
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93 |
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94 def just_warn(*args, **kw): # pragma: no cover |
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95 """ |
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96 We only warn on Python 3 because we are not aware of any concrete |
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97 consequences of not setting the cell on Python 2. |
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98 """ |
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99 |
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100 |
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101 else: # Python 3 and later. |
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102 from collections.abc import Mapping, Sequence # noqa |
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103 |
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104 def just_warn(*args, **kw): |
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105 """ |
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106 We only warn on Python 3 because we are not aware of any concrete |
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107 consequences of not setting the cell on Python 2. |
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108 """ |
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109 warnings.warn( |
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110 "Running interpreter doesn't sufficiently support code object " |
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111 "introspection. Some features like bare super() or accessing " |
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112 "__class__ will not work with slotted classes.", |
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113 RuntimeWarning, |
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114 stacklevel=2, |
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115 ) |
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116 |
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117 def isclass(klass): |
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118 return isinstance(klass, type) |
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119 |
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120 TYPE = "class" |
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121 |
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122 def iteritems(d): |
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123 return d.items() |
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124 |
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125 def metadata_proxy(d): |
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126 return types.MappingProxyType(dict(d)) |
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127 |
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128 |
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129 def make_set_closure_cell(): |
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130 """Return a function of two arguments (cell, value) which sets |
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131 the value stored in the closure cell `cell` to `value`. |
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132 """ |
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133 # pypy makes this easy. (It also supports the logic below, but |
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134 # why not do the easy/fast thing?) |
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135 if PYPY: |
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136 |
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137 def set_closure_cell(cell, value): |
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138 cell.__setstate__((value,)) |
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139 |
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140 return set_closure_cell |
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141 |
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142 # Otherwise gotta do it the hard way. |
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143 |
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144 # Create a function that will set its first cellvar to `value`. |
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145 def set_first_cellvar_to(value): |
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146 x = value |
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147 return |
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148 |
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149 # This function will be eliminated as dead code, but |
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150 # not before its reference to `x` forces `x` to be |
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151 # represented as a closure cell rather than a local. |
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152 def force_x_to_be_a_cell(): # pragma: no cover |
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153 return x |
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154 |
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155 try: |
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156 # Extract the code object and make sure our assumptions about |
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157 # the closure behavior are correct. |
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158 if PY2: |
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159 co = set_first_cellvar_to.func_code |
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160 else: |
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161 co = set_first_cellvar_to.__code__ |
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162 if co.co_cellvars != ("x",) or co.co_freevars != (): |
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163 raise AssertionError # pragma: no cover |
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164 |
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165 # Convert this code object to a code object that sets the |
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166 # function's first _freevar_ (not cellvar) to the argument. |
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167 if sys.version_info >= (3, 8): |
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168 # CPython 3.8+ has an incompatible CodeType signature |
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169 # (added a posonlyargcount argument) but also added |
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170 # CodeType.replace() to do this without counting parameters. |
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171 set_first_freevar_code = co.replace( |
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172 co_cellvars=co.co_freevars, co_freevars=co.co_cellvars |
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173 ) |
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174 else: |
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175 args = [co.co_argcount] |
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176 if not PY2: |
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177 args.append(co.co_kwonlyargcount) |
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178 args.extend( |
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179 [ |
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180 co.co_nlocals, |
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181 co.co_stacksize, |
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182 co.co_flags, |
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183 co.co_code, |
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184 co.co_consts, |
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185 co.co_names, |
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186 co.co_varnames, |
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187 co.co_filename, |
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188 co.co_name, |
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189 co.co_firstlineno, |
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190 co.co_lnotab, |
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191 # These two arguments are reversed: |
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192 co.co_cellvars, |
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193 co.co_freevars, |
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194 ] |
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195 ) |
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196 set_first_freevar_code = types.CodeType(*args) |
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197 |
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198 def set_closure_cell(cell, value): |
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199 # Create a function using the set_first_freevar_code, |
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200 # whose first closure cell is `cell`. Calling it will |
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201 # change the value of that cell. |
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202 setter = types.FunctionType( |
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203 set_first_freevar_code, {}, "setter", (), (cell,) |
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204 ) |
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205 # And call it to set the cell. |
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206 setter(value) |
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207 |
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208 # Make sure it works on this interpreter: |
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209 def make_func_with_cell(): |
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210 x = None |
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211 |
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212 def func(): |
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213 return x # pragma: no cover |
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214 |
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215 return func |
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216 |
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217 if PY2: |
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218 cell = make_func_with_cell().func_closure[0] |
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219 else: |
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220 cell = make_func_with_cell().__closure__[0] |
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221 set_closure_cell(cell, 100) |
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222 if cell.cell_contents != 100: |
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223 raise AssertionError # pragma: no cover |
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224 |
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225 except Exception: |
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226 return just_warn |
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227 else: |
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228 return set_closure_cell |
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229 |
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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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changeset
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230 |
4f3585e2f14b
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff
changeset
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231 set_closure_cell = make_set_closure_cell() |