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# 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
"""Interfaces for Pylint objects."""
from __future__ import annotations
import warnings
from tokenize import TokenInfo
from typing import TYPE_CHECKING, NamedTuple
from astroid import nodes
if TYPE_CHECKING:
from pylint.checkers import BaseChecker
from pylint.message import Message
from pylint.reporters.ureports.nodes import Section
__all__ = (
"IRawChecker",
"IAstroidChecker",
"ITokenChecker",
"IReporter",
"IChecker",
"HIGH",
"CONTROL_FLOW",
"INFERENCE",
"INFERENCE_FAILURE",
"UNDEFINED",
"CONFIDENCE_LEVELS",
"CONFIDENCE_LEVEL_NAMES",
)
class Confidence(NamedTuple):
name: str
description: str
# Warning Certainties
HIGH = Confidence("HIGH", "Warning that is not based on inference result.")
CONTROL_FLOW = Confidence(
"CONTROL_FLOW", "Warning based on assumptions about control flow."
)
INFERENCE = Confidence("INFERENCE", "Warning based on inference result.")
INFERENCE_FAILURE = Confidence(
"INFERENCE_FAILURE", "Warning based on inference with failures."
)
UNDEFINED = Confidence("UNDEFINED", "Warning without any associated confidence level.")
CONFIDENCE_LEVELS = [HIGH, CONTROL_FLOW, INFERENCE, INFERENCE_FAILURE, UNDEFINED]
CONFIDENCE_LEVEL_NAMES = [i.name for i in CONFIDENCE_LEVELS]
class Interface:
"""Base class for interfaces."""
def __init__(self) -> None:
warnings.warn(
"Interface and all of its subclasses have been deprecated "
"and will be removed in pylint 3.0.",
DeprecationWarning,
stacklevel=2,
)
@classmethod
def is_implemented_by(
cls: type[Interface] | tuple[type[Interface], ...], instance: BaseChecker
) -> bool:
with warnings.catch_warnings():
warnings.filterwarnings("ignore", category=DeprecationWarning)
return implements(instance, cls)
def implements(
obj: BaseChecker,
interface: type[Interface] | tuple[type[Interface], ...],
) -> bool:
"""Does the given object (maybe an instance or class) implement the interface."""
# TODO: 3.0: Remove deprecated function
warnings.warn(
"implements has been deprecated in favour of using basic "
"inheritance patterns without using __implements__.",
DeprecationWarning,
stacklevel=2,
)
implements_ = getattr(obj, "__implements__", ())
if not isinstance(implements_, (list, tuple)):
implements_ = (implements_,)
return any(issubclass(i, interface) for i in implements_)
class IChecker(Interface):
"""Base interface, to be used only for sub interfaces definition."""
def open(self) -> None:
"""Called before visiting project (i.e. set of modules)."""
def close(self) -> None:
"""Called after visiting project (i.e. set of modules)."""
class IRawChecker(IChecker):
"""Interface for checker which need to parse the raw file."""
def process_module(self, node: nodes.Module) -> None:
"""Process a module.
The module's content is accessible via ``astroid.stream``
"""
class ITokenChecker(IChecker):
"""Interface for checkers that need access to the token list."""
def process_tokens(self, tokens: list[TokenInfo]) -> None:
"""Process a module.
Tokens is a list of all source code tokens in the file.
"""
class IAstroidChecker(IChecker):
"""Interface for checker which prefers receive events according to
statement type.
"""
class IReporter(Interface):
"""Reporter collect messages and display results encapsulated in a layout."""
def handle_message(self, msg: Message) -> None:
"""Handle the given message object."""
def display_reports(self, layout: Section) -> None:
"""Display results encapsulated in the layout tree."""