Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/pluggy/hooks.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 """
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2 Internal hook annotation, representation and calling machinery.
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3 """
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4 import inspect
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5 import sys
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6 import warnings
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7 from .callers import _legacymulticall, _multicall
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8
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9
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10 class HookspecMarker(object):
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11 """ Decorator helper class for marking functions as hook specifications.
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12
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13 You can instantiate it with a project_name to get a decorator.
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14 Calling :py:meth:`.PluginManager.add_hookspecs` later will discover all marked functions
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15 if the :py:class:`.PluginManager` uses the same project_name.
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16 """
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17
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18 def __init__(self, project_name):
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19 self.project_name = project_name
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20
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21 def __call__(
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22 self, function=None, firstresult=False, historic=False, warn_on_impl=None
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23 ):
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24 """ if passed a function, directly sets attributes on the function
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25 which will make it discoverable to :py:meth:`.PluginManager.add_hookspecs`.
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26 If passed no function, returns a decorator which can be applied to a function
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27 later using the attributes supplied.
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28
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29 If ``firstresult`` is ``True`` the 1:N hook call (N being the number of registered
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30 hook implementation functions) will stop at I<=N when the I'th function
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31 returns a non-``None`` result.
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32
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33 If ``historic`` is ``True`` calls to a hook will be memorized and replayed
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34 on later registered plugins.
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35
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36 """
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37
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38 def setattr_hookspec_opts(func):
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39 if historic and firstresult:
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40 raise ValueError("cannot have a historic firstresult hook")
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41 setattr(
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42 func,
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43 self.project_name + "_spec",
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44 dict(
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45 firstresult=firstresult,
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46 historic=historic,
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47 warn_on_impl=warn_on_impl,
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48 ),
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49 )
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50 return func
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51
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52 if function is not None:
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53 return setattr_hookspec_opts(function)
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54 else:
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55 return setattr_hookspec_opts
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56
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57
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58 class HookimplMarker(object):
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59 """ Decorator helper class for marking functions as hook implementations.
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60
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61 You can instantiate with a ``project_name`` to get a decorator.
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62 Calling :py:meth:`.PluginManager.register` later will discover all marked functions
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63 if the :py:class:`.PluginManager` uses the same project_name.
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64 """
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65
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66 def __init__(self, project_name):
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67 self.project_name = project_name
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68
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69 def __call__(
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70 self,
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71 function=None,
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72 hookwrapper=False,
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73 optionalhook=False,
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74 tryfirst=False,
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75 trylast=False,
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76 ):
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77
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78 """ if passed a function, directly sets attributes on the function
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79 which will make it discoverable to :py:meth:`.PluginManager.register`.
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80 If passed no function, returns a decorator which can be applied to a
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81 function later using the attributes supplied.
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82
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83 If ``optionalhook`` is ``True`` a missing matching hook specification will not result
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84 in an error (by default it is an error if no matching spec is found).
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85
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86 If ``tryfirst`` is ``True`` this hook implementation will run as early as possible
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87 in the chain of N hook implementations for a specification.
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88
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89 If ``trylast`` is ``True`` this hook implementation will run as late as possible
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90 in the chain of N hook implementations.
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91
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92 If ``hookwrapper`` is ``True`` the hook implementations needs to execute exactly
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93 one ``yield``. The code before the ``yield`` is run early before any non-hookwrapper
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94 function is run. The code after the ``yield`` is run after all non-hookwrapper
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95 function have run. The ``yield`` receives a :py:class:`.callers._Result` object
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96 representing the exception or result outcome of the inner calls (including other
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97 hookwrapper calls).
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98
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99 """
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100
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101 def setattr_hookimpl_opts(func):
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102 setattr(
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103 func,
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104 self.project_name + "_impl",
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105 dict(
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106 hookwrapper=hookwrapper,
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107 optionalhook=optionalhook,
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108 tryfirst=tryfirst,
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109 trylast=trylast,
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110 ),
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111 )
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112 return func
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113
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114 if function is None:
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115 return setattr_hookimpl_opts
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116 else:
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117 return setattr_hookimpl_opts(function)
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118
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119
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120 def normalize_hookimpl_opts(opts):
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121 opts.setdefault("tryfirst", False)
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122 opts.setdefault("trylast", False)
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123 opts.setdefault("hookwrapper", False)
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124 opts.setdefault("optionalhook", False)
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125
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126
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127 if hasattr(inspect, "getfullargspec"):
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128
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129 def _getargspec(func):
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130 return inspect.getfullargspec(func)
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131
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132
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133 else:
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134
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135 def _getargspec(func):
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136 return inspect.getargspec(func)
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137
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138
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139 _PYPY3 = hasattr(sys, "pypy_version_info") and sys.version_info.major == 3
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140
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141
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142 def varnames(func):
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143 """Return tuple of positional and keywrord argument names for a function,
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144 method, class or callable.
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145
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146 In case of a class, its ``__init__`` method is considered.
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147 For methods the ``self`` parameter is not included.
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148 """
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149 cache = getattr(func, "__dict__", {})
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150 try:
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151 return cache["_varnames"]
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152 except KeyError:
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153 pass
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154
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155 if inspect.isclass(func):
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156 try:
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157 func = func.__init__
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158 except AttributeError:
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159 return (), ()
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160 elif not inspect.isroutine(func): # callable object?
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161 try:
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162 func = getattr(func, "__call__", func)
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163 except Exception:
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164 return (), ()
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165
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166 try: # func MUST be a function or method here or we won't parse any args
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167 spec = _getargspec(func)
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168 except TypeError:
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169 return (), ()
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170
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171 args, defaults = tuple(spec.args), spec.defaults
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172 if defaults:
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173 index = -len(defaults)
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174 args, kwargs = args[:index], tuple(args[index:])
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175 else:
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176 kwargs = ()
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177
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178 # strip any implicit instance arg
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179 # pypy3 uses "obj" instead of "self" for default dunder methods
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180 implicit_names = ("self",) if not _PYPY3 else ("self", "obj")
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181 if args:
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182 if inspect.ismethod(func) or (
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183 "." in getattr(func, "__qualname__", ()) and args[0] in implicit_names
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184 ):
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185 args = args[1:]
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186
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187 try:
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188 cache["_varnames"] = args, kwargs
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189 except TypeError:
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190 pass
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191 return args, kwargs
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192
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193
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194 class _HookRelay(object):
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195 """ hook holder object for performing 1:N hook calls where N is the number
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196 of registered plugins.
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197
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198 """
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199
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200
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201 class _HookCaller(object):
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202 def __init__(self, name, hook_execute, specmodule_or_class=None, spec_opts=None):
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203 self.name = name
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204 self._wrappers = []
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205 self._nonwrappers = []
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206 self._hookexec = hook_execute
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207 self.argnames = None
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208 self.kwargnames = None
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209 self.multicall = _multicall
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210 self.spec = None
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211 if specmodule_or_class is not None:
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212 assert spec_opts is not None
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213 self.set_specification(specmodule_or_class, spec_opts)
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214
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215 def has_spec(self):
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216 return self.spec is not None
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217
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218 def set_specification(self, specmodule_or_class, spec_opts):
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219 assert not self.has_spec()
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220 self.spec = HookSpec(specmodule_or_class, self.name, spec_opts)
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221 if spec_opts.get("historic"):
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222 self._call_history = []
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223
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224 def is_historic(self):
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225 return hasattr(self, "_call_history")
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226
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227 def _remove_plugin(self, plugin):
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228 def remove(wrappers):
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229 for i, method in enumerate(wrappers):
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230 if method.plugin == plugin:
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231 del wrappers[i]
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232 return True
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233
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234 if remove(self._wrappers) is None:
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235 if remove(self._nonwrappers) is None:
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236 raise ValueError("plugin %r not found" % (plugin,))
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237
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238 def get_hookimpls(self):
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239 # Order is important for _hookexec
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240 return self._nonwrappers + self._wrappers
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241
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242 def _add_hookimpl(self, hookimpl):
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243 """Add an implementation to the callback chain.
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244 """
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245 if hookimpl.hookwrapper:
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246 methods = self._wrappers
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247 else:
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248 methods = self._nonwrappers
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249
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250 if hookimpl.trylast:
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251 methods.insert(0, hookimpl)
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252 elif hookimpl.tryfirst:
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253 methods.append(hookimpl)
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254 else:
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255 # find last non-tryfirst method
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256 i = len(methods) - 1
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257 while i >= 0 and methods[i].tryfirst:
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258 i -= 1
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259 methods.insert(i + 1, hookimpl)
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260
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261 if "__multicall__" in hookimpl.argnames:
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262 warnings.warn(
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263 "Support for __multicall__ is now deprecated and will be"
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264 "removed in an upcoming release.",
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265 DeprecationWarning,
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266 )
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267 self.multicall = _legacymulticall
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268
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269 def __repr__(self):
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270 return "<_HookCaller %r>" % (self.name,)
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271
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272 def __call__(self, *args, **kwargs):
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273 if args:
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274 raise TypeError("hook calling supports only keyword arguments")
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275 assert not self.is_historic()
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276 if self.spec and self.spec.argnames:
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277 notincall = (
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278 set(self.spec.argnames) - set(["__multicall__"]) - set(kwargs.keys())
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279 )
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280 if notincall:
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281 warnings.warn(
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282 "Argument(s) {} which are declared in the hookspec "
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283 "can not be found in this hook call".format(tuple(notincall)),
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284 stacklevel=2,
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285 )
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286 return self._hookexec(self, self.get_hookimpls(), kwargs)
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287
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288 def call_historic(self, result_callback=None, kwargs=None, proc=None):
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289 """Call the hook with given ``kwargs`` for all registered plugins and
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290 for all plugins which will be registered afterwards.
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291
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292 If ``result_callback`` is not ``None`` it will be called for for each
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293 non-``None`` result obtained from a hook implementation.
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294
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295 .. note::
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296 The ``proc`` argument is now deprecated.
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297 """
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298 if proc is not None:
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299 warnings.warn(
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300 "Support for `proc` argument is now deprecated and will be"
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301 "removed in an upcoming release.",
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302 DeprecationWarning,
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303 )
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304 result_callback = proc
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305
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306 self._call_history.append((kwargs or {}, result_callback))
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307 # historizing hooks don't return results
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308 res = self._hookexec(self, self.get_hookimpls(), kwargs)
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309 if result_callback is None:
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310 return
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311 # XXX: remember firstresult isn't compat with historic
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312 for x in res or []:
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313 result_callback(x)
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314
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315 def call_extra(self, methods, kwargs):
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316 """ Call the hook with some additional temporarily participating
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317 methods using the specified ``kwargs`` as call parameters. """
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318 old = list(self._nonwrappers), list(self._wrappers)
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319 for method in methods:
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320 opts = dict(hookwrapper=False, trylast=False, tryfirst=False)
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321 hookimpl = HookImpl(None, "<temp>", method, opts)
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322 self._add_hookimpl(hookimpl)
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323 try:
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324 return self(**kwargs)
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325 finally:
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326 self._nonwrappers, self._wrappers = old
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327
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328 def _maybe_apply_history(self, method):
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329 """Apply call history to a new hookimpl if it is marked as historic.
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330 """
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331 if self.is_historic():
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332 for kwargs, result_callback in self._call_history:
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333 res = self._hookexec(self, [method], kwargs)
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334 if res and result_callback is not None:
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335 result_callback(res[0])
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336
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337
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338 class HookImpl(object):
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339 def __init__(self, plugin, plugin_name, function, hook_impl_opts):
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340 self.function = function
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341 self.argnames, self.kwargnames = varnames(self.function)
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342 self.plugin = plugin
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343 self.opts = hook_impl_opts
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344 self.plugin_name = plugin_name
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345 self.__dict__.update(hook_impl_opts)
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346
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347 def __repr__(self):
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348 return "<HookImpl plugin_name=%r, plugin=%r>" % (self.plugin_name, self.plugin)
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349
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350
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351 class HookSpec(object):
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352 def __init__(self, namespace, name, opts):
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353 self.namespace = namespace
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354 self.function = function = getattr(namespace, name)
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355 self.name = name
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356 self.argnames, self.kwargnames = varnames(function)
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357 self.opts = opts
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358 self.argnames = ["__multicall__"] + list(self.argnames)
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359 self.warn_on_impl = opts.get("warn_on_impl")