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"""Base class and support functions for linters."""
from __future__ import absolute_import
from __future__ import print_function
from abc import ABCMeta, abstractmethod
from typing import Dict, List, Optional
class LinterBase(object):
"""Base Class for all linters."""
__metaclass__ = ABCMeta
def __init__(self, cmd_name, required_version, cmd_location=None):
# type: (str, str, Optional[str]) -> None
"""
Create a linter.
cmd_name - short friendly name
required_version - the required version string to check against
cmd_location - location of executable
"""
self.cmd_name = cmd_name
self.required_version = required_version
self.cmd_location = cmd_location
@abstractmethod
def get_lint_cmd_args(self, file_name):
# type: (str) -> List[str]
"""Get the command to run a linter."""
pass
def get_fix_cmd_args(self, file_name):
# type: (str) -> Optional[List[str]]
# pylint: disable=no-self-use,unused-argument
"""Get the command to run a linter fix."""
return None
@abstractmethod
def get_lint_version_cmd_args(self):
# type: () -> List[str]
"""Get the command to run a linter version check."""
pass
def needs_file_diff(self):
# type: () -> bool
# pylint: disable=no-self-use
"""
Check if we need to diff the output of this linter with the original file.
This applies to tools like clang-format and yapf which do not have a notion of linting. We
introduce the idea of linting by formatting a file with the tool to standard out and
comparing it to the original.
"""
return False
def ignore_interpreter(self):
# type: () -> bool
# pylint: disable=no-self-use
"""
Check if we should ignore the interpreter when searching for the linter to run.
This applies to mypy specifically since the pylinters are executed under Python 2 but mypy
is executed by python 3.
"""
return False
class LinterInstance(object):
"""A pair of a Linter and the full path of the linter cmd to run."""
def __init__(self, linter, cmd_path):
# type: (LinterBase, List[str]) -> None
"""Construct a LinterInstance."""
self.linter = linter
self.cmd_path = cmd_path
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