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""" |
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2
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PRIVATE MODULE: do not import (from) it directly. |
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3
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4
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This module contains functionality for supporting the compatibility of jsons |
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with multiple Python versions. |
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""" |
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import sys |
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8
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import typing |
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from enum import Enum |
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11
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from jsons._cache import cached |
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13
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14
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class Flag(Enum): |
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""" |
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This is a light version of the Flag enum type that was introduced in |
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Python3.6. It supports the use of pipes for members (Flag.A | Flag.B). |
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""" |
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@classmethod |
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def _get_inst(cls, value): |
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try: |
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result = cls(value) |
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except ValueError: |
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pseudo_member = object.__new__(cls) |
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pseudo_member._value_ = value |
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contained = [elem.name for elem in cls if elem in pseudo_member] |
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pseudo_member._name_ = '|'.join(contained) |
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result = pseudo_member |
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return result |
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32
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def __or__(self, other: 'Flag') -> 'Flag': |
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new_value = other.value | self.value |
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return self._get_inst(new_value) |
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35
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36
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def __contains__(self, item: 'Flag') -> bool: |
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37
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return item.value == self.value & item.value |
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38
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39
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__ror__ = __or__ |
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40
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41
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42
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@cached |
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43
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def tuple_with_ellipsis(tup: type) -> bool: |
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# Python3.5: Tuples have __tuple_use_ellipsis__ |
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45
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# Python3.7: Tuples have __args__ |
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46
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use_el = getattr(tup, '__tuple_use_ellipsis__', None) |
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47
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if use_el is None: |
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48
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use_el = tup.__args__[-1] is ... |
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return use_el |
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50
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51
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52
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@cached |
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53
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def get_union_params(un: type) -> list: |
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54
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# Python3.5: Unions have __union_params__ |
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55
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# Python3.7: Unions have __args__ |
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56
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return getattr(un, '__union_params__', getattr(un, '__args__', None)) |
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57
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58
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59
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@cached |
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60
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def get_naked_class(cls: type) -> type: |
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61
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# Python3.5: typing classes have __extra__ |
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62
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# Python3.6: typing classes have __extra__ |
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63
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# Python3.7: typing classes have __origin__ |
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64
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# Return the non-generic class (e.g. dict) of a generic type (e.g. Dict). |
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65
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return getattr(cls, '__extra__', getattr(cls, '__origin__', cls)) |
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66
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67
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68
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@cached |
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69
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def get_type_hints(callable_: callable, fallback_ns=None): |
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70
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# Python3.5: get_type_hints raises on classes without explicit constructor. |
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71
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# Python3.10: get_type_hints on classes does not take the constructor. |
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72
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try: |
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73
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result = typing.get_type_hints(callable_) |
|
74
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except AttributeError: |
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75
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result = {} |
|
76
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except NameError: |
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77
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# attempt to resolve in global namespace - this works around an |
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78
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# issue in 3.7 whereby __init__ created by dataclasses fails |
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79
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# to find it's context. See https://bugs.python.org/issue34776 |
|
80
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if fallback_ns is not None: |
|
81
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context_dict = sys.modules[fallback_ns].__dict__ |
|
82
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result = typing.get_type_hints(callable_, globalns=context_dict) |
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83
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84
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if sys.version_info.minor >= 10 and type(callable_) is type: |
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85
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annotations_from_init = typing.get_type_hints(callable_.__init__) |
|
86
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if 'return' in annotations_from_init: |
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87
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# Python3.10: 'return' is a key that holds the returning type. |
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88
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del annotations_from_init['return'] |
|
89
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result = {**result, **annotations_from_init} |
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90
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91
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return result |
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92
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ramonhagenaars /
jsons
