Coverage for sources/frigid/namespaces.py: 100%

1# vim: set filetype=python fileencoding=utf-8: 

2# -*- coding: utf-8 -*- 

3 

4#============================================================================# 

5# # 

6# Licensed under the Apache License, Version 2.0 (the "License"); # 

7# you may not use this file except in compliance with the License. # 

8# You may obtain a copy of the License at # 

9# # 

10# http://www.apache.org/licenses/LICENSE-2.0 # 

11# # 

12# Unless required by applicable law or agreed to in writing, software # 

13# distributed under the License is distributed on an "AS IS" BASIS, # 

14# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # 

15# See the License for the specific language governing permissions and # 

16# limitations under the License. # 

17# # 

18#============================================================================# 

19 

20 

21''' Immutable namespaces. 

22 

23 Provides a namespace type with immutable attributes. Similar to 

24 :py:class:`types.SimpleNamespace`, but attributes cannot be modified or 

25 deleted after initialization. 

26 

27 The namespace implementation is modeled after 

28 :py:class:`types.SimpleNamespace` but adds immutability. Like 

29 :py:class:`types.SimpleNamespace`, it provides a simple ``__repr__`` which 

30 lists all attributes. 

31 

32 >>> from frigid import Namespace 

33 >>> ns = Namespace( x = 1, y = 2 ) 

34 >>> ns.z = 3 # Attempt to add attribute 

35 Traceback (most recent call last): 

36 ... 

37 frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'z'. 

38 >>> ns.x = 4 # Attempt modification 

39 Traceback (most recent call last): 

40 ... 

41 frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'x'. 

42 >>> ns 

43 frigid.namespaces.Namespace( x = 1, y = 2 ) 

44''' # noqa: E501 

45 

46 

47from . import __ 

48from . import classes as _classes 

49 

50 

51class Namespace( metaclass = _classes.Class ): 

52 # TODO: Dynadoc fragments. 

53 ''' Immutable namespaces. ''' 

54 

55 __slots__ = ( '__dict__', ) 

56 

57 def __init__( 

58 self, 

59 *iterables: __.DictionaryPositionalArgument[ __.H, __.V ], 

60 **attributes: __.DictionaryNominativeArgument[ __.V ], 

61 ) -> None: 

62 self.__dict__.update( 

63 __.ImmutableDictionary( 

64 *iterables, **attributes ) ) # pyright: ignore 

65 super( ).__init__( ) 

66 

67 def __repr__( self ) -> str: 

68 attributes = ', '.join( 

69 f"{key} = {value!r}" for key, value 

70 in getattr( self, '__dict__', { } ).items( ) ) 

71 fqname = __.ccutils.qualify_class_name( type( self ) ) 

72 if not attributes: return f"{fqname}( )" 

73 return f"{fqname}( {attributes} )" 

74 

75 def __eq__( self, other: __.typx.Any ) -> __.ComparisonResult: 

76 if isinstance( other, ( Namespace, __.types.SimpleNamespace ) ): 

77 return self.__dict__ == other.__dict__ 

78 return NotImplemented 

79 

80 def __ne__( self, other: __.typx.Any ) -> __.ComparisonResult: 

81 if isinstance( other, ( Namespace, __.types.SimpleNamespace ) ): 

82 return self.__dict__ != other.__dict__ 

83 return NotImplemented