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annotate planemo/lib/python3.7/site-packages/future/builtins/newsuper.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 '''
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2 This module provides a newsuper() function in Python 2 that mimics the
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3 behaviour of super() in Python 3. It is designed to be used as follows:
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4
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5 from __future__ import division, absolute_import, print_function
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6 from future.builtins import super
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7
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8 And then, for example:
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9
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10 class VerboseList(list):
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11 def append(self, item):
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12 print('Adding an item')
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13 super().append(item) # new simpler super() function
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14
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15 Importing this module on Python 3 has no effect.
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16
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17 This is based on (i.e. almost identical to) Ryan Kelly's magicsuper
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18 module here:
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19
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20 https://github.com/rfk/magicsuper.git
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21
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22 Excerpts from Ryan's docstring:
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23
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24 "Of course, you can still explicitly pass in the arguments if you want
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25 to do something strange. Sometimes you really do want that, e.g. to
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26 skip over some classes in the method resolution order.
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27
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28 "How does it work? By inspecting the calling frame to determine the
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29 function object being executed and the object on which it's being
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30 called, and then walking the object's __mro__ chain to find out where
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31 that function was defined. Yuck, but it seems to work..."
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32 '''
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33
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34 from __future__ import absolute_import
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35 import sys
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36 from types import FunctionType
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37
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38 from future.utils import PY3, PY26
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39
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40
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41 _builtin_super = super
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42
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43 _SENTINEL = object()
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44
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45 def newsuper(typ=_SENTINEL, type_or_obj=_SENTINEL, framedepth=1):
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46 '''Like builtin super(), but capable of magic.
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47
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48 This acts just like the builtin super() function, but if called
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49 without any arguments it attempts to infer them at runtime.
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50 '''
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51 # Infer the correct call if used without arguments.
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52 if typ is _SENTINEL:
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53 # We'll need to do some frame hacking.
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54 f = sys._getframe(framedepth)
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55
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56 try:
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57 # Get the function's first positional argument.
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58 type_or_obj = f.f_locals[f.f_code.co_varnames[0]]
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59 except (IndexError, KeyError,):
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60 raise RuntimeError('super() used in a function with no args')
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61
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62 try:
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63 # Get the MRO so we can crawl it.
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64 mro = type_or_obj.__mro__
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65 except (AttributeError, RuntimeError): # see issue #160
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66 try:
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67 mro = type_or_obj.__class__.__mro__
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68 except AttributeError:
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69 raise RuntimeError('super() used with a non-newstyle class')
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70
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71 # A ``for...else`` block? Yes! It's odd, but useful.
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72 # If unfamiliar with for...else, see:
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73 #
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74 # http://psung.blogspot.com/2007/12/for-else-in-python.html
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75 for typ in mro:
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76 # Find the class that owns the currently-executing method.
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77 for meth in typ.__dict__.values():
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78 # Drill down through any wrappers to the underlying func.
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79 # This handles e.g. classmethod() and staticmethod().
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80 try:
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81 while not isinstance(meth,FunctionType):
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82 if isinstance(meth, property):
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83 # Calling __get__ on the property will invoke
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84 # user code which might throw exceptions or have
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85 # side effects
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86 meth = meth.fget
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87 else:
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88 try:
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89 meth = meth.__func__
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90 except AttributeError:
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91 meth = meth.__get__(type_or_obj, typ)
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92 except (AttributeError, TypeError):
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93 continue
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94 if meth.func_code is f.f_code:
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95 break # Aha! Found you.
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96 else:
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97 continue # Not found! Move onto the next class in MRO.
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98 break # Found! Break out of the search loop.
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99 else:
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100 raise RuntimeError('super() called outside a method')
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101
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102 # Dispatch to builtin super().
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103 if type_or_obj is not _SENTINEL:
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104 return _builtin_super(typ, type_or_obj)
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105 return _builtin_super(typ)
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106
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107
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108 def superm(*args, **kwds):
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109 f = sys._getframe(1)
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110 nm = f.f_code.co_name
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111 return getattr(newsuper(framedepth=2),nm)(*args, **kwds)
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112
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113
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114 __all__ = ['newsuper']