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100 lines
4.1 KiB
Python
100 lines
4.1 KiB
Python
"""
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Example checker detecting deprecated functions/methods. Following example searches for usages of
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deprecated function `deprecated_function` and deprecated method `MyClass.deprecated_method`
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from module mymodule:
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.. code-block:: console
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$ cat mymodule.py
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def deprecated_function():
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pass
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def myfunction(arg0, arg1, deprecated_arg1=None, arg2='foo', arg3='bar', deprecated_arg2='spam'):
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pass
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class MyClass:
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def deprecated_method(self):
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pass
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def mymethod(self, arg0, arg1, deprecated1=None, arg2='foo', deprecated2='bar', arg3='spam'):
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pass
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$ cat mymain.py
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from mymodule import deprecated_function, myfunction, MyClass
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deprecated_function()
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myfunction(0, 1, 'deprecated_arg1', deprecated_arg2=None)
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MyClass().deprecated_method()
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MyClass().mymethod(0, 1, deprecated1=None, deprecated2=None)
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$ pylint --load-plugins=deprecation_checker mymain.py
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************* Module mymain
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mymain.py:3:0: W1505: Using deprecated method deprecated_function() (deprecated-method)
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mymain.py:4:0: W1511: Using deprecated argument deprecated_arg1 of method myfunction() (deprecated-argument)
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mymain.py:4:0: W1511: Using deprecated argument deprecated_arg2 of method myfunction() (deprecated-argument)
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mymain.py:5:0: W1505: Using deprecated method deprecated_method() (deprecated-method)
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mymain.py:6:0: W1511: Using deprecated argument deprecated1 of method mymethod() (deprecated-argument)
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mymain.py:6:0: W1511: Using deprecated argument deprecated2 of method mymethod() (deprecated-argument)
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------------------------------------------------------------------
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Your code has been rated at 2.00/10 (previous run: 2.00/10, +0.00)
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"""
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from typing import Set, Tuple, Union
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from pylint.checkers import BaseChecker, DeprecatedMixin
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from pylint.interfaces import IAstroidChecker
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class DeprecationChecker(DeprecatedMixin, BaseChecker):
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"""Class implementing deprecation checker."""
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# DeprecationMixin class is Mixin class implementing logic for searching deprecated methods and functions.
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# The list of deprecated methods/functions is defined by implementing class via deprecated_methods callback.
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# DeprecatedMixin class is overriding attributes of BaseChecker hence must be specified *before* BaseChecker
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# in list of base classes.
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__implements__ = (IAstroidChecker,)
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# The name defines a custom section of the config for this checker.
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name = "deprecated"
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def deprecated_methods(self) -> Set[str]:
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"""Callback method called by DeprecatedMixin for every method/function found in the code.
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Returns:
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collections.abc.Container of deprecated function/method names.
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"""
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return {"mymodule.deprecated_function", "mymodule.MyClass.deprecated_method"}
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def deprecated_arguments(
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self, method: str
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) -> Tuple[Tuple[Union[int, None], str], ...]:
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"""Callback returning the deprecated arguments of method/function.
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Returns:
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collections.abc.Iterable in form:
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((POSITION1, PARAM1), (POSITION2: PARAM2) ...)
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where
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* POSITIONX - position of deprecated argument PARAMX in function definition.
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If argument is keyword-only, POSITIONX should be None.
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* PARAMX - name of the deprecated argument.
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"""
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if method == "mymodule.myfunction":
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# myfunction() has two deprecated arguments:
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# * deprecated_arg1 defined at 2nd position and
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# * deprecated_arg2 defined at 5th position.
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return ((2, "deprecated_arg1"), (5, "deprecated_arg2"))
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if method == "mymodule.MyClass.mymethod":
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# mymethod() has two deprecated arguments:
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# * deprecated1 defined at 2nd position and
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# * deprecated2 defined at 4th position.
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return ((2, "deprecated1"), (4, "deprecated2"))
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return ()
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def register(linter):
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"""This required method auto registers the checker.
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:param linter: The linter to register the checker to.
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:type linter: pylint.lint.PyLinter
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"""
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linter.register_checker(DeprecationChecker(linter))
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