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for_any_all.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 for loops that only check for a condition."""

from __future__ import annotations

from typing import TYPE_CHECKING

from astroid import nodes

from pylint.checkers import BaseChecker
from pylint.checkers.utils import (
    assigned_bool,
    only_required_for_messages,
    returns_bool,
)
from pylint.interfaces import HIGH

if TYPE_CHECKING:
    from pylint.lint.pylinter import PyLinter

class ConsiderUsingAnyOrAllChecker(BaseChecker):
    name = "consider-using-any-or-all"
    msgs = {
        "C0501": (
            "`for` loop could be `%s`",
            "consider-using-any-or-all",
            "A for loop that checks for a condition and return a bool can be replaced with any or all.",
        )
    }

@only_required_for_messages("consider-using-any-or-all")
    def visit_for(self, node: nodes.For) -> None:
        if len(node.body) != 1:  # Only If node with no Else
            return
        if not isinstance(node.body[0], nodes.If):
            return

if_children = list(node.body[0].get_children())
        if any(isinstance(child, nodes.If) for child in if_children):
            # an if node within the if-children indicates an elif clause,
            # suggesting complex logic.
            return

node_after_loop = node.next_sibling()

if self._assigned_reassigned_returned(node, if_children, node_after_loop):
            final_return_bool = node_after_loop.value.name
            suggested_string = self._build_suggested_string(node, final_return_bool)
            self.add_message(
                "consider-using-any-or-all",
                node=node,
                args=suggested_string,
                confidence=HIGH,
            )
            return

if self._if_statement_returns_bool(if_children, node_after_loop):
            final_return_bool = node_after_loop.value.value
            suggested_string = self._build_suggested_string(node, final_return_bool)
            self.add_message(
                "consider-using-any-or-all",
                node=node,
                args=suggested_string,
                confidence=HIGH,
            )
            return

@staticmethod
    def _if_statement_returns_bool(
        if_children: list[nodes.NodeNG], node_after_loop: nodes.NodeNG
    ) -> bool:
        """Detect for-loop, if-statement, return pattern:

Ex:
            def any_uneven(items):
                for item in items:
                    if not item % 2 == 0:
                        return True
                return False
        """
        if not len(if_children) == 2:
            # The If node has only a comparison and return
            return False
        if not returns_bool(if_children[1]):
            return False

# Check for terminating boolean return right after the loop
        return returns_bool(node_after_loop)

@staticmethod
    def _assigned_reassigned_returned(
        node: nodes.For, if_children: list[nodes.NodeNG], node_after_loop: nodes.NodeNG
    ) -> bool:
        """Detect boolean-assign, for-loop, re-assign, return pattern:

Ex:
            def check_lines(lines, max_chars):
                long_line = False
                for line in lines:
                    if len(line) > max_chars:
                        long_line = True
                    # no elif / else statement
                return long_line
        """
        node_before_loop = node.previous_sibling()

if not assigned_bool(node_before_loop):
            # node before loop isn't assigning to boolean
            return False

assign_children = [x for x in if_children if isinstance(x, nodes.Assign)]
        if not assign_children:
            # if-nodes inside loop aren't assignments
            return False

# We only care for the first assign node of the if-children. Otherwise it breaks the pattern.
        first_target = assign_children[0].targets[0]
        target_before_loop = node_before_loop.targets[0]

if not (
            isinstance(first_target, nodes.AssignName)
            and isinstance(target_before_loop, nodes.AssignName)
        ):
            return False

node_before_loop_name = node_before_loop.targets[0].name
        return (
            first_target.name == node_before_loop_name
            and isinstance(node_after_loop, nodes.Return)
            and isinstance(node_after_loop.value, nodes.Name)
            and node_after_loop.value.name == node_before_loop_name
        )

@staticmethod
    def _build_suggested_string(node: nodes.For, final_return_bool: bool) -> str:
        """When a nodes.For node can be rewritten as an any/all statement, return a
        suggestion for that statement.

'final_return_bool' is the boolean literal returned after the for loop if all
        conditions fail.
        """
        loop_var = node.target.as_string()
        loop_iter = node.iter.as_string()
        test_node = next(node.body[0].get_children())

if isinstance(test_node, nodes.UnaryOp) and test_node.op == "not":
            # The condition is negated. Advance the node to the operand and modify the suggestion
            test_node = test_node.operand
            suggested_function = "all" if final_return_bool else "not all"
        else:
            suggested_function = "not any" if final_return_bool else "any"

test = test_node.as_string()
        return f"{suggested_function}({test} for {loop_var} in {loop_iter})"

def register(linter: PyLinter) -> None:
    linter.register_checker(ConsiderUsingAnyOrAllChecker(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
__init__.py	text/x-script.python	575 B	root/root	-rw-r--r--	2024-12-18 10:22:21
_check_docs_utils.py	text/x-script.python	25.74 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
bad_builtin.py	text/x-script.python	2.22 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
broad_try_clause.py	text/x-script.python	2.25 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
check_elif.py	text/x-script.python	2.09 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
code_style.py	text/x-script.python	12.51 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
comparetozero.py	text/x-script.python	3.09 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
comparison_placement.py	text/x-script.python	2.3 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
confusing_elif.py	text/x-script.python	1.99 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
consider_refactoring_into_while_condition.py	text/x-script.python	3.23 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
consider_ternary_expression.py	text/x-script.python	1.66 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
dict_init_mutate.py	text/x-script.python	2.06 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
docparams.py	text/x-script.python	25.3 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
docstyle.py	text/x-script.python	2.87 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
dunder.py	text/x-script.python	2.33 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
empty_comment.py	text/x-script.python	1.91 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
emptystring.py	text/x-script.python	2.9 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
eq_without_hash.py	text/x-script.python	1.42 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
for_any_all.py	text/x-script.python	5.69 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
magic_value.py	text/x-script.python	4.14 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
mccabe.py	text/x-script.python	6.89 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
no_self_use.py	text/x-script.python	3.62 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
overlapping_exceptions.py	text/x-script.python	3.26 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
private_import.py	text/x-script.python	10.97 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
redefined_loop_name.py	text/x-script.python	3.14 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
redefined_variable_type.py	text/x-script.python	4 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
set_membership.py	text/x-script.python	1.75 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
typing.py	text/x-script.python	19.91 KB	root/root	-rw-r--r--	2024-12-18 10:22:21
while_used.py	text/x-script.python	1.07 KB	root/root	-rw-r--r--	2024-12-18 10:22:21