mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-26 17:05:31 +01:00
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# Copyright (c) 2016 Alexander Todorov <atodorov@otb.bg>
|
|
# Copyright (c) 2017-2018, 2020 Claudiu Popa <pcmanticore@gmail.com>
|
|
# Copyright (c) 2019 Pierre Sassoulas <pierre.sassoulas@gmail.com>
|
|
# Copyright (c) 2020 Anthony Sottile <asottile@umich.edu>
|
|
|
|
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
|
|
|
|
"""Looks for comparisons to empty string."""
|
|
|
|
import itertools
|
|
|
|
import astroid
|
|
|
|
from pylint import checkers, interfaces
|
|
from pylint.checkers import utils
|
|
|
|
|
|
def _is_constant_zero(node):
|
|
return isinstance(node, astroid.Const) and node.value == 0
|
|
|
|
|
|
class CompareToZeroChecker(checkers.BaseChecker):
|
|
"""Checks for comparisons to zero.
|
|
Most of the times you should use the fact that integers with a value of 0 are false.
|
|
An exception to this rule is when 0 is allowed in the program and has a
|
|
different meaning than None!
|
|
"""
|
|
|
|
__implements__ = (interfaces.IAstroidChecker,)
|
|
|
|
# configuration section name
|
|
name = "compare-to-zero"
|
|
msgs = {
|
|
"C2001": (
|
|
"Avoid comparisons to zero",
|
|
"compare-to-zero",
|
|
"Used when Pylint detects comparison to a 0 constant.",
|
|
)
|
|
}
|
|
|
|
priority = -2
|
|
options = ()
|
|
|
|
@utils.check_messages("compare-to-zero")
|
|
def visit_compare(self, node):
|
|
_operators = ["!=", "==", "is not", "is"]
|
|
# note: astroid.Compare has the left most operand in node.left
|
|
# while the rest are a list of tuples in node.ops
|
|
# the format of the tuple is ('compare operator sign', node)
|
|
# here we squash everything into `ops` to make it easier for processing later
|
|
ops = [("", node.left)]
|
|
ops.extend(node.ops)
|
|
ops = list(itertools.chain(*ops))
|
|
|
|
for ops_idx in range(len(ops) - 2):
|
|
op_1 = ops[ops_idx]
|
|
op_2 = ops[ops_idx + 1]
|
|
op_3 = ops[ops_idx + 2]
|
|
error_detected = False
|
|
|
|
# 0 ?? X
|
|
if _is_constant_zero(op_1) and op_2 in _operators:
|
|
error_detected = True
|
|
# X ?? 0
|
|
elif op_2 in _operators and _is_constant_zero(op_3):
|
|
error_detected = True
|
|
|
|
if error_detected:
|
|
self.add_message("compare-to-zero", node=node)
|
|
|
|
|
|
def register(linter):
|
|
"""Required method to auto register this checker."""
|
|
linter.register_checker(CompareToZeroChecker(linter))
|