/usr/lib/python3/dist-packages/pylint/checkers/newstyle.py is in pylint3 1.5.2-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | # Copyright (c) 2005-2014 LOGILAB S.A. (Paris, FRANCE).
# http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""check for new / old style related problems
"""
import sys
import astroid
from pylint.interfaces import IAstroidChecker, INFERENCE, INFERENCE_FAILURE, HIGH
from pylint.checkers import BaseChecker
from pylint.checkers.utils import (
check_messages,
node_frame_class,
has_known_bases
)
MSGS = {
'E1001': ('Use of __slots__ on an old style class',
'slots-on-old-class',
'Used when an old style class uses the __slots__ attribute.',
{'maxversion': (3, 0)}),
'E1002': ('Use of super on an old style class',
'super-on-old-class',
'Used when an old style class uses the super builtin.',
{'maxversion': (3, 0)}),
'E1003': ('Bad first argument %r given to super()',
'bad-super-call',
'Used when another argument than the current class is given as \
first argument of the super builtin.'),
'E1004': ('Missing argument to super()',
'missing-super-argument',
'Used when the super builtin didn\'t receive an \
argument.',
{'maxversion': (3, 0)}),
'W1001': ('Use of "property" on an old style class',
'property-on-old-class',
'Used when Pylint detect the use of the builtin "property" \
on an old style class while this is relying on new style \
classes features.',
{'maxversion': (3, 0)}),
'C1001': ('Old-style class defined.',
'old-style-class',
'Used when a class is defined that does not inherit from another'
'class and does not inherit explicitly from "object".',
{'maxversion': (3, 0)})
}
class NewStyleConflictChecker(BaseChecker):
"""checks for usage of new style capabilities on old style classes and
other new/old styles conflicts problems
* use of property, __slots__, super
* "super" usage
"""
__implements__ = (IAstroidChecker,)
# configuration section name
name = 'newstyle'
# messages
msgs = MSGS
priority = -2
# configuration options
options = ()
@check_messages('slots-on-old-class', 'old-style-class')
def visit_classdef(self, node):
""" Check __slots__ in old style classes and old
style class definition.
"""
if '__slots__' in node and not node.newstyle:
confidence = (INFERENCE if has_known_bases(node)
else INFERENCE_FAILURE)
self.add_message('slots-on-old-class', node=node,
confidence=confidence)
# The node type could be class, exception, metaclass, or
# interface. Presumably, the non-class-type nodes would always
# have an explicit base class anyway.
if not node.bases and node.type == 'class' and not node.metaclass():
# We use confidence HIGH here because this message should only ever
# be emitted for classes at the root of the inheritance hierarchyself.
self.add_message('old-style-class', node=node, confidence=HIGH)
@check_messages('property-on-old-class')
def visit_call(self, node):
"""check property usage"""
parent = node.parent.frame()
if (isinstance(parent, astroid.ClassDef) and
not parent.newstyle and
isinstance(node.func, astroid.Name)):
confidence = (INFERENCE if has_known_bases(parent)
else INFERENCE_FAILURE)
name = node.func.name
if name == 'property':
self.add_message('property-on-old-class', node=node,
confidence=confidence)
@check_messages('super-on-old-class', 'bad-super-call', 'missing-super-argument')
def visit_functiondef(self, node):
"""check use of super"""
# ignore actual functions or method within a new style class
if not node.is_method():
return
klass = node.parent.frame()
for stmt in node.nodes_of_class(astroid.Call):
if node_frame_class(stmt) != node_frame_class(node):
# Don't look down in other scopes.
continue
expr = stmt.func
if not isinstance(expr, astroid.Attribute):
continue
call = expr.expr
# skip the test if using super
if not (isinstance(call, astroid.Call) and
isinstance(call.func, astroid.Name) and
call.func.name == 'super'):
continue
if not klass.newstyle and has_known_bases(klass):
# super should not be used on an old style class
self.add_message('super-on-old-class', node=node)
else:
# super first arg should be the class
if not call.args and sys.version_info[0] == 3:
# unless Python 3
continue
try:
supcls = (call.args and next(call.args[0].infer())
or None)
except astroid.InferenceError:
continue
if supcls is None:
self.add_message('missing-super-argument', node=call)
continue
if klass is not supcls:
name = None
# if supcls is not YES, then supcls was infered
# and use its name. Otherwise, try to look
# for call.args[0].name
if supcls is not astroid.YES:
name = supcls.name
else:
if hasattr(call.args[0], 'name'):
name = call.args[0].name
if name is not None:
self.add_message('bad-super-call', node=call, args=(name, ))
def register(linter):
"""required method to auto register this checker """
linter.register_checker(NewStyleConflictChecker(linter))
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