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annotate planemo/lib/python3.7/site-packages/humanfriendly/deprecation.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # Human friendly input/output in Python.
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2 #
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3 # Author: Peter Odding <peter@peterodding.com>
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4 # Last Change: March 2, 2020
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5 # URL: https://humanfriendly.readthedocs.io
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6
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7 """
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8 Support for deprecation warnings when importing names from old locations.
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9
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10 When software evolves, things tend to move around. This is usually detrimental
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11 to backwards compatibility (in Python this primarily manifests itself as
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12 :exc:`~exceptions.ImportError` exceptions).
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13
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14 While backwards compatibility is very important, it should not get in the way
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15 of progress. It would be great to have the agility to move things around
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16 without breaking backwards compatibility.
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17
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18 This is where the :mod:`humanfriendly.deprecation` module comes in: It enables
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19 the definition of backwards compatible aliases that emit a deprecation warning
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20 when they are accessed.
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21
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22 The way it works is that it wraps the original module in an :class:`DeprecationProxy`
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23 object that defines a :func:`~DeprecationProxy.__getattr__()` special method to
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24 override attribute access of the module.
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25 """
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26
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27 # Standard library modules.
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28 import collections
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29 import functools
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30 import importlib
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31 import inspect
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32 import sys
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33 import types
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34 import warnings
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35
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36 # Modules included in our package.
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37 from humanfriendly.text import format
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38
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39 # Registry of known aliases (used by humanfriendly.sphinx).
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40 REGISTRY = collections.defaultdict(dict)
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41
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42 # Public identifiers that require documentation.
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43 __all__ = ("DeprecationProxy", "define_aliases", "deprecated_args", "get_aliases", "is_method")
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44
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45
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46 def define_aliases(module_name, **aliases):
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47 """
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48 Update a module with backwards compatible aliases.
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49
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50 :param module_name: The ``__name__`` of the module (a string).
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51 :param aliases: Each keyword argument defines an alias. The values
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52 are expected to be "dotted paths" (strings).
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53
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54 The behavior of this function depends on whether the Sphinx documentation
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55 generator is active, because the use of :class:`DeprecationProxy` to shadow the
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56 real module in :data:`sys.modules` has the unintended side effect of
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57 breaking autodoc support for ``:data:`` members (module variables).
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58
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59 To avoid breaking Sphinx the proxy object is omitted and instead the
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60 aliased names are injected into the original module namespace, to make sure
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61 that imports can be satisfied when the documentation is being rendered.
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62
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63 If you run into cyclic dependencies caused by :func:`define_aliases()` when
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64 running Sphinx, you can try moving the call to :func:`define_aliases()` to
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65 the bottom of the Python module you're working on.
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66 """
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67 module = sys.modules[module_name]
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68 proxy = DeprecationProxy(module, aliases)
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69 # Populate the registry of aliases.
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70 for name, target in aliases.items():
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71 REGISTRY[module.__name__][name] = target
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72 # Avoid confusing Sphinx.
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73 if "sphinx" in sys.modules:
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74 for name, target in aliases.items():
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75 setattr(module, name, proxy.resolve(target))
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76 else:
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77 # Install a proxy object to raise DeprecationWarning.
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78 sys.modules[module_name] = proxy
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79
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80
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81 def get_aliases(module_name):
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82 """
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83 Get the aliases defined by a module.
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84
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85 :param module_name: The ``__name__`` of the module (a string).
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86 :returns: A dictionary with string keys and values:
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87
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88 1. Each key gives the name of an alias
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89 created for backwards compatibility.
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90
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91 2. Each value gives the dotted path of
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92 the proper location of the identifier.
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93
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94 An empty dictionary is returned for modules that
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95 don't define any backwards compatible aliases.
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96 """
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97 return REGISTRY.get(module_name, {})
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98
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99
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100 def deprecated_args(*names):
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101 """
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102 Deprecate positional arguments without dropping backwards compatibility.
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103
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104 :param names:
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105
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106 The positional arguments to :func:`deprecated_args()` give the names of
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107 the positional arguments that the to-be-decorated function should warn
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108 about being deprecated and translate to keyword arguments.
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109
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110 :returns: A decorator function specialized to `names`.
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111
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112 The :func:`deprecated_args()` decorator function was created to make it
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113 easy to switch from positional arguments to keyword arguments [#]_ while
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114 preserving backwards compatibility [#]_ and informing call sites
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115 about the change.
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116
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117 .. [#] Increased flexibility is the main reason why I find myself switching
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118 from positional arguments to (optional) keyword arguments as my code
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119 evolves to support more use cases.
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120
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121 .. [#] In my experience positional argument order implicitly becomes part
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122 of API compatibility whether intended or not. While this makes sense
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123 for functions that over time adopt more and more optional arguments,
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124 at a certain point it becomes an inconvenience to code maintenance.
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125
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126 Here's an example of how to use the decorator::
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127
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128 @deprecated_args('text')
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129 def report_choice(**options):
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130 print(options['text'])
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131
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132 When the decorated function is called with positional arguments
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133 a deprecation warning is given::
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134
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135 >>> report_choice('this will give a deprecation warning')
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136 DeprecationWarning: report_choice has deprecated positional arguments, please switch to keyword arguments
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137 this will give a deprecation warning
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138
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139 But when the function is called with keyword arguments no deprecation
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140 warning is emitted::
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141
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142 >>> report_choice(text='this will not give a deprecation warning')
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143 this will not give a deprecation warning
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144 """
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145 def decorator(function):
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146 def translate(args, kw):
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147 # Raise TypeError when too many positional arguments are passed to the decorated function.
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148 if len(args) > len(names):
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149 raise TypeError(
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150 format(
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151 "{name} expected at most {limit} arguments, got {count}",
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152 name=function.__name__,
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153 limit=len(names),
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154 count=len(args),
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155 )
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156 )
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157 # Emit a deprecation warning when positional arguments are used.
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158 if args:
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159 warnings.warn(
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160 format(
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161 "{name} has deprecated positional arguments, please switch to keyword arguments",
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162 name=function.__name__,
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163 ),
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164 category=DeprecationWarning,
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165 stacklevel=3,
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166 )
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167 # Translate positional arguments to keyword arguments.
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168 for name, value in zip(names, args):
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169 kw[name] = value
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170 if is_method(function):
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171 @functools.wraps(function)
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172 def wrapper(*args, **kw):
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173 """Wrapper for instance methods."""
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174 args = list(args)
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175 self = args.pop(0)
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176 translate(args, kw)
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177 return function(self, **kw)
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178 else:
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179 @functools.wraps(function)
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180 def wrapper(*args, **kw):
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181 """Wrapper for module level functions."""
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182 translate(args, kw)
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183 return function(**kw)
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184 return wrapper
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185 return decorator
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186
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187
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188 def is_method(function):
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189 """Check if the expected usage of the given function is as an instance method."""
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190 try:
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191 # Python 3.3 and newer.
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192 signature = inspect.signature(function)
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193 return "self" in signature.parameters
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194 except AttributeError:
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195 # Python 3.2 and older.
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196 metadata = inspect.getargspec(function)
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197 return "self" in metadata.args
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198
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199
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200 class DeprecationProxy(types.ModuleType):
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201
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202 """Emit deprecation warnings for imports that should be updated."""
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203
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204 def __init__(self, module, aliases):
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205 """
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206 Initialize an :class:`DeprecationProxy` object.
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207
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208 :param module: The original module object.
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209 :param aliases: A dictionary of aliases.
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210 """
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211 # Initialize our superclass.
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212 super(DeprecationProxy, self).__init__(name=module.__name__)
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213 # Store initializer arguments.
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214 self.module = module
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215 self.aliases = aliases
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216
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217 def __getattr__(self, name):
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218 """
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219 Override module attribute lookup.
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220
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221 :param name: The name to look up (a string).
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222 :returns: The attribute value.
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223 """
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224 # Check if the given name is an alias.
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225 target = self.aliases.get(name)
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226 if target is not None:
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227 # Emit the deprecation warning.
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228 warnings.warn(
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229 format("%s.%s was moved to %s, please update your imports", self.module.__name__, name, target),
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230 category=DeprecationWarning,
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231 stacklevel=2,
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232 )
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233 # Resolve the dotted path.
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234 return self.resolve(target)
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235 # Look up the name in the original module namespace.
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236 value = getattr(self.module, name, None)
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237 if value is not None:
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238 return value
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239 # Fall back to the default behavior.
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240 raise AttributeError(format("module '%s' has no attribute '%s'", self.module.__name__, name))
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241
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242 def resolve(self, target):
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243 """
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244 Look up the target of an alias.
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245
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246 :param target: The fully qualified dotted path (a string).
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247 :returns: The value of the given target.
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248 """
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249 module_name, _, member = target.rpartition(".")
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250 module = importlib.import_module(module_name)
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251 return getattr(module, member)