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Code Editor : mccabe.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 """Module to add McCabe checker class for pylint.""" from __future__ import annotations from collections.abc import Sequence from typing import TYPE_CHECKING, Any, TypeVar, Union from astroid import nodes from mccabe import PathGraph as Mccabe_PathGraph from mccabe import PathGraphingAstVisitor as Mccabe_PathGraphingAstVisitor from pylint import checkers from pylint.checkers.utils import only_required_for_messages from pylint.interfaces import HIGH if TYPE_CHECKING: from pylint.lint import PyLinter _StatementNodes = Union[ nodes.Assert, nodes.Assign, nodes.AugAssign, nodes.Delete, nodes.Raise, nodes.Yield, nodes.Import, nodes.Call, nodes.Subscript, nodes.Pass, nodes.Continue, nodes.Break, nodes.Global, nodes.Return, nodes.Expr, nodes.Await, ] _SubGraphNodes = Union[nodes.If, nodes.TryExcept, nodes.For, nodes.While] _AppendableNodeT = TypeVar( "_AppendableNodeT", bound=Union[_StatementNodes, nodes.While, nodes.FunctionDef] ) class PathGraph(Mccabe_PathGraph): # type: ignore[misc] def __init__(self, node: _SubGraphNodes | nodes.FunctionDef): super().__init__(name="", entity="", lineno=1) self.root = node class PathGraphingAstVisitor(Mccabe_PathGraphingAstVisitor): # type: ignore[misc] def __init__(self) -> None: super().__init__() self._bottom_counter = 0 self.graph: PathGraph | None = None def default(self, node: nodes.NodeNG, *args: Any) -> None: for child in node.get_children(): self.dispatch(child, *args) def dispatch(self, node: nodes.NodeNG, *args: Any) -> Any: self.node = node klass = node.__class__ meth = self._cache.get(klass) if meth is None: class_name = klass.__name__ meth = getattr(self.visitor, "visit" + class_name, self.default) self._cache[klass] = meth return meth(node, *args) def visitFunctionDef(self, node: nodes.FunctionDef) -> None: if self.graph is not None: # closure pathnode = self._append_node(node) self.tail = pathnode self.dispatch_list(node.body) bottom = f"{self._bottom_counter}" self._bottom_counter += 1 self.graph.connect(self.tail, bottom) self.graph.connect(node, bottom) self.tail = bottom else: self.graph = PathGraph(node) self.tail = node self.dispatch_list(node.body) self.graphs[f"{self.classname}{node.name}"] = self.graph self.reset() visitAsyncFunctionDef = visitFunctionDef def visitSimpleStatement(self, node: _StatementNodes) -> None: self._append_node(node) visitAssert = ( visitAssign ) = ( visitAugAssign ) = ( visitDelete ) = ( visitRaise ) = ( visitYield ) = ( visitImport ) = ( visitCall ) = ( visitSubscript ) = ( visitPass ) = ( visitContinue ) = ( visitBreak ) = visitGlobal = visitReturn = visitExpr = visitAwait = visitSimpleStatement def visitWith(self, node: nodes.With) -> None: self._append_node(node) self.dispatch_list(node.body) visitAsyncWith = visitWith def _append_node(self, node: _AppendableNodeT) -> _AppendableNodeT | None: if not self.tail or not self.graph: return None self.graph.connect(self.tail, node) self.tail = node return node def _subgraph( self, node: _SubGraphNodes, name: str, extra_blocks: Sequence[nodes.ExceptHandler] = (), ) -> None: """Create the subgraphs representing any `if` and `for` statements.""" if self.graph is None: # global loop self.graph = PathGraph(node) self._subgraph_parse(node, node, extra_blocks) self.graphs[f"{self.classname}{name}"] = self.graph self.reset() else: self._append_node(node) self._subgraph_parse(node, node, extra_blocks) def _subgraph_parse( self, node: _SubGraphNodes, pathnode: _SubGraphNodes, extra_blocks: Sequence[nodes.ExceptHandler], ) -> None: """Parse the body and any `else` block of `if` and `for` statements.""" loose_ends = [] self.tail = node self.dispatch_list(node.body) loose_ends.append(self.tail) for extra in extra_blocks: self.tail = node self.dispatch_list(extra.body) loose_ends.append(self.tail) if node.orelse: self.tail = node self.dispatch_list(node.orelse) loose_ends.append(self.tail) else: loose_ends.append(node) if node and self.graph: bottom = f"{self._bottom_counter}" self._bottom_counter += 1 for end in loose_ends: self.graph.connect(end, bottom) self.tail = bottom class McCabeMethodChecker(checkers.BaseChecker): """Checks McCabe complexity cyclomatic threshold in methods and functions to validate a too complex code. """ name = "design" msgs = { "R1260": ( "%s is too complex. The McCabe rating is %d", "too-complex", "Used when a method or function is too complex based on " "McCabe Complexity Cyclomatic", ) } options = ( ( "max-complexity", { "default": 10, "type": "int", "metavar": "<int>", "help": "McCabe complexity cyclomatic threshold", }, ), ) @only_required_for_messages("too-complex") def visit_module(self, node: nodes.Module) -> None: """Visit an astroid.Module node to check too complex rating and add message if is greater than max_complexity stored from options. """ visitor = PathGraphingAstVisitor() for child in node.body: visitor.preorder(child, visitor) for graph in visitor.graphs.values(): complexity = graph.complexity() node = graph.root if hasattr(node, "name"): node_name = f"'{node.name}'" else: node_name = f"This '{node.__class__.__name__.lower()}'" if complexity <= self.linter.config.max_complexity: continue self.add_message( "too-complex", node=node, confidence=HIGH, args=(node_name, complexity) ) def register(linter: PyLinter) -> None: linter.register_checker(McCabeMethodChecker(linter))
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