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nested_min_max.py

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt

"""Check for use of nested min/max functions."""

from __future__ import annotations

import copy
from typing import TYPE_CHECKING

from astroid import nodes, objects

from pylint.checkers import BaseChecker
from pylint.checkers.utils import only_required_for_messages, safe_infer
from pylint.interfaces import INFERENCE

if TYPE_CHECKING:
    from pylint.lint import PyLinter

DICT_TYPES = (
    objects.DictValues,
    objects.DictKeys,
    objects.DictItems,
    nodes.node_classes.Dict,
)

class NestedMinMaxChecker(BaseChecker):
    """Multiple nested min/max calls on the same line will raise multiple messages.

This behaviour is intended as it would slow down the checker to check
    for nested call with minimal benefits.
    """

FUNC_NAMES = ("builtins.min", "builtins.max")

name = "nested_min_max"
    msgs = {
        "W3301": (
            "Do not use nested call of '%s'; it's possible to do '%s' instead",
            "nested-min-max",
            "Nested calls ``min(1, min(2, 3))`` can be rewritten as ``min(1, 2, 3)``.",
        )
    }

@classmethod
    def is_min_max_call(cls, node: nodes.NodeNG) -> bool:
        if not isinstance(node, nodes.Call):
            return False

inferred = safe_infer(node.func)
        return (
            isinstance(inferred, nodes.FunctionDef)
            and inferred.qname() in cls.FUNC_NAMES
        )

@classmethod
    def get_redundant_calls(cls, node: nodes.Call) -> list[nodes.Call]:
        return [
            arg
            for arg in node.args
            if cls.is_min_max_call(arg) and arg.func.name == node.func.name
        ]

@only_required_for_messages("nested-min-max")
    def visit_call(self, node: nodes.Call) -> None:
        if not self.is_min_max_call(node):
            return

redundant_calls = self.get_redundant_calls(node)
        if not redundant_calls:
            return

fixed_node = copy.copy(node)
        while len(redundant_calls) > 0:
            for i, arg in enumerate(fixed_node.args):
                # Exclude any calls with generator expressions as there is no
                # clear better suggestion for them.
                if isinstance(arg, nodes.Call) and any(
                    isinstance(a, nodes.GeneratorExp) for a in arg.args
                ):
                    return

if arg in redundant_calls:
                    fixed_node.args = (
                        fixed_node.args[:i] + arg.args + fixed_node.args[i + 1 :]
                    )
                    break

redundant_calls = self.get_redundant_calls(fixed_node)

for idx, arg in enumerate(fixed_node.args):
            if not isinstance(arg, nodes.Const):
                inferred = safe_infer(arg)
                if isinstance(
                    inferred, (nodes.List, nodes.Tuple, nodes.Set, *DICT_TYPES)
                ):
                    splat_node = nodes.Starred(lineno=inferred.lineno)
                    splat_node.value = arg
                    fixed_node.args = (
                        fixed_node.args[:idx]
                        + [splat_node]
                        + fixed_node.args[idx + 1 : idx]
                    )

self.add_message(
            "nested-min-max",
            node=node,
            args=(node.func.name, fixed_node.as_string()),
            confidence=INFERENCE,
        )

def register(linter: PyLinter) -> None:
    linter.register_checker(NestedMinMaxChecker(linter))

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
..	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
__pycache__	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
base	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
classes	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
refactoring	dir	-	root/root	drwxr-xr-x	2024-12-24 06:48:51
__init__.py	text/x-script.python	4.26 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
async.py	text/x-script.python	3.83 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
bad_chained_comparison.py	text/x-script.python	2.18 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
base_checker.py	text/x-script.python	10.67 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
deprecated.py	text/x-script.python	9.43 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
design_analysis.py	text/x-script.python	21.62 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
dunder_methods.py	text/x-script.python	3.43 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
ellipsis_checker.py	text/x-script.python	1.97 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
exceptions.py	text/x-script.python	26.05 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
format.py	text/x-script.python	26.91 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
imports.py	text/x-script.python	41.31 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
lambda_expressions.py	text/x-script.python	3.38 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
logging.py	text/x-script.python	15.84 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
mapreduce_checker.py	text/x-script.python	1.08 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
method_args.py	text/x-script.python	4.68 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
misc.py	text/x-script.python	4.87 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
modified_iterating_checker.py	text/x-script.python	7.67 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
nested_min_max.py	text/x-script.python	3.63 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
newstyle.py	text/x-script.python	4.46 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
non_ascii_names.py	text/x-script.python	6.98 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
raw_metrics.py	text/x-script.python	3.81 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
similar.py	text/x-script.python	33.29 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
spelling.py	text/x-script.python	16.17 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
stdlib.py	text/x-script.python	31.28 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
strings.py	text/x-script.python	40.28 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
threading_checker.py	text/x-script.python	1.9 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
typecheck.py	text/x-script.python	86.83 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
unicode.py	text/x-script.python	18.05 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
unsupported_version.py	text/x-script.python	2.93 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
utils.py	text/x-script.python	77.26 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
variables.py	text/x-script.python	126.57 KB	root/root	-rw-r--r--	2024-12-18 10:22:21