Coverage for pyTooling/Attributes/ArgParse/Flag.py: 100%

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9# Authors: # 

10# Patrick Lehmann # 

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14# Copyright 2017-2026 Patrick Lehmann - Bötzingen, Germany # 

15# Copyright 2007-2016 Patrick Lehmann - Dresden, Germany # 

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31# 

32""" 

33Attributes describing switch arguments - options without a value, like ``--verbose``. 

34 

35A switch is ``True`` when it appears on the command line and ``False`` otherwise. 

36""" 

37from typing import Optional as Nullable 

38 

39from pyTooling.Decorators import export 

40from pyTooling.Attributes.ArgParse.Argument import NamedArgument 

41 

42 

43@export 

44class FlagArgument(NamedArgument): 

45 """ 

46 Defines a switch argument like ``--help``. 

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 The constructor expects positional (``*args``), the destination parameter name ``dest`` and/or named parameters 

56 (``**kwargs``) which are passed to :meth:`~ArgumentParser.add_argument`. 

57 

58 To implement a switch argument, the following named parameters are predefined: 

59 

60 * ``action="store_const"`` 

61 * ``const=True`` 

62 * ``default=False`` 

63 

64 This implements a boolean parameter passed to the handler method. 

65 """ 

66 args = [] 

67 if short is not None: 

68 args.append(short) 

69 if long is not None: 

70 args.append(long) 

71 

72 kwargs = { 

73 "dest": dest, 

74 "action": "store_const", 

75 "const": True, 

76 "default": False, 

77 "help": help, 

78 } 

79 super().__init__(*args, **kwargs) 

80 

81 

82@export 

83class ShortFlag(FlagArgument): 

84 """Defines a switch argument in short form like ``-v``.""" 

85 

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

87 """ 

88 Initialize a switch argument in its short form. 

89 

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

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

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

93 """ 

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

95 

96 

97@export 

98class LongFlag(FlagArgument): 

99 """Defines a switch argument in long form like ``--verbose``.""" 

100 

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

102 """ 

103 Initialize a switch argument in its long form. 

104 

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

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

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

108 """ 

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