Coverage for pyTooling/Attributes/ArgParse/KeyValueFlag.py: 48%

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10# Patrick Lehmann # 

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32""" 

33Attributes describing options carrying key-value-pairs, like ``-Dkey=value``. 

34 

35The pairs are collected into a dictionary and passed to the handler method as one parameter. 

36""" 

37from typing import Optional as Nullable 

38 

39from pyTooling.Decorators import export 

40from pyTooling.Attributes.ArgParse.Argument import NamedAndValuedArgument 

41 

42 

43@export 

44class NamedKeyValuePairsArgument(NamedAndValuedArgument): 

45 """ 

46 Defines a key-value argument like ``-Dkey=value``. 

47 

48 Some of the named parameters passed to :meth:`~ArgumentParser.add_argument` are predefined (or overwritten) to create 

49 a boolean parameter passed to the registered handler method. The boolean parameter is ``True`` if the switch argument 

50 is present in the commandline arguments, otherwise ``False``. 

51 """ 

52 

53 def __init__(self, short: Nullable[str] = None, long: Nullable[str] = None, dest: Nullable[str] = None, help: Nullable[str] = None) -> None: 

54 """ 

55 Initializes a flag argument. 

56 

57 .. admonition:: ArgParse parameterization 

58 

59 :meth:`~argparse.ArgumentParser.add_argument` is called with the option strings from ``short`` and ``long`` 

60 as positional parameters, and with these named parameters: 

61 

62 * ``dest=dest`` 

63 * ``action="store_const"`` 

64 * ``const=True`` 

65 * ``default=False`` 

66 * ``help=help`` 

67 

68 ``action="store_const"`` with ``const=True`` and ``default=False`` is what makes the handler method receive a 

69 boolean. 

70 

71 .. attention:: 

72 

73 This is exactly :class:`~pyTooling.Attributes.ArgParse.Flag.FlagArgument`'s parameterization, so no 

74 key-value pair is parsed and the handler method receives a boolean. See the class doc-string. 

75 

76 :param short: Optional, short option name including the dash, e.g. ``"-v"``. Default: ``None``. 

77 :param long: Optional, long option name including the dashes, e.g. ``"--verbose"``. Default: ``None``. 

78 :param dest: Name the parsed value is stored under in the :class:`~argparse.Namespace`, and the name the handler 

79 method reads it by. 

80 :param help: Optional, help text shown for this argument in the help page. Default: ``None``. 

81 """ 

82 args = [] 

83 if short is not None: 

84 args.append(short) 

85 

86 if long is not None: 

87 args.append(long) 

88 

89 kwargs = { 

90 "dest": dest, 

91 "action": "store_const", 

92 "const": True, 

93 "default": False, 

94 "help": help, 

95 } 

96 super().__init__(*args, **kwargs) 

97 

98 

99@export 

100class ShortKeyValueFlag(NamedKeyValuePairsArgument): 

101 """Defines a key-value argument in short form like ``-Dkey=value``.""" 

102 

103 def __init__(self, short: Nullable[str] = None, dest: Nullable[str] = None, help: Nullable[str] = None) -> None: 

104 """ 

105 Initialize a key-value argument in its short form. 

106 

107 :param short: Optional, short form of the option, including its dash, e.g. :pycode:`short="-v"`. 

108 :param dest: Optional, name of the parameter the parsed value is passed to the handler method as. 

109 :param help: Optional, help text of the option, displayed in the help page. 

110 """ 

111 super().__init__(short=short, dest=dest, help=help) 

112 

113 

114@export 

115class LongKeyValueFlag(NamedKeyValuePairsArgument): 

116 """Defines a key-value argument in long form like ``--define key=value``.""" 

117 

118 def __init__(self, long: Nullable[str] = None, dest: Nullable[str] = None, help: Nullable[str] = None) -> None: 

119 """ 

120 Initialize a key-value argument in its long form. 

121 

122 :param long: Optional, long form of the option, including its dashes, e.g. :pycode:`long="--verbose"`. 

123 :param dest: Optional, name of the parameter the parsed value is passed to the handler method as. 

124 :param help: Optional, help text of the option, displayed in the help page. 

125 """ 

126 super().__init__(long=long, dest=dest, help=help)