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772 lines
28 KiB
Python
772 lines
28 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2006-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
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# Copyright (c) 2012-2015 Google, Inc.
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# Copyright (c) 2013 moxian <aleftmail@inbox.ru>
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# Copyright (c) 2014-2020 Claudiu Popa <pcmanticore@gmail.com>
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# Copyright (c) 2014 frost-nzcr4 <frost.nzcr4@jagmort.com>
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# Copyright (c) 2014 Brett Cannon <brett@python.org>
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# Copyright (c) 2014 Michal Nowikowski <godfryd@gmail.com>
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# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
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# Copyright (c) 2015 Mike Frysinger <vapier@gentoo.org>
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# Copyright (c) 2015 Fabio Natali <me@fabionatali.com>
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# Copyright (c) 2015 Harut <yes@harutune.name>
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# Copyright (c) 2015 Mihai Balint <balint.mihai@gmail.com>
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# Copyright (c) 2015 Pavel Roskin <proski@gnu.org>
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# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
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# Copyright (c) 2016 Petr Pulc <petrpulc@gmail.com>
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# Copyright (c) 2016 Moises Lopez <moylop260@vauxoo.com>
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# Copyright (c) 2016 Ashley Whetter <ashley@awhetter.co.uk>
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# Copyright (c) 2017-2018 Bryce Guinta <bryce.paul.guinta@gmail.com>
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# Copyright (c) 2017, 2019 hippo91 <guillaume.peillex@gmail.com>
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# Copyright (c) 2017 Krzysztof Czapla <k.czapla68@gmail.com>
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# Copyright (c) 2017 Łukasz Rogalski <rogalski.91@gmail.com>
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# Copyright (c) 2017 James M. Allen <james.m.allen@gmail.com>
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# Copyright (c) 2017 vinnyrose <vinnyrose@users.noreply.github.com>
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# Copyright (c) 2018, 2020 Bryce Guinta <bryce.guinta@protonmail.com>
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# Copyright (c) 2018-2020 Pierre Sassoulas <pierre.sassoulas@gmail.com>
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# Copyright (c) 2018 Pierre Sassoulas <pierre.sassoulas@wisebim.fr>
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# Copyright (c) 2018, 2020 Anthony Sottile <asottile@umich.edu>
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# Copyright (c) 2018 Lucas Cimon <lucas.cimon@gmail.com>
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# Copyright (c) 2018 Michael Hudson-Doyle <michael.hudson@canonical.com>
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# Copyright (c) 2018 Natalie Serebryakova <natalie.serebryakova@Natalies-MacBook-Pro.local>
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# Copyright (c) 2018 ssolanki <sushobhitsolanki@gmail.com>
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# Copyright (c) 2018 Marcus Näslund <naslundx@gmail.com>
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# Copyright (c) 2018 Mike Frysinger <vapier@gmail.com>
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# Copyright (c) 2018 Fureigh <rhys.fureigh@gsa.gov>
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# Copyright (c) 2018 Andreas Freimuth <andreas.freimuth@united-bits.de>
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# Copyright (c) 2018 Jakub Wilk <jwilk@jwilk.net>
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# Copyright (c) 2019 Nick Drozd <nicholasdrozd@gmail.com>
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# Copyright (c) 2019 Hugo van Kemenade <hugovk@users.noreply.github.com>
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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
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"""Python code format's checker.
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By default try to follow Guido's style guide :
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https://www.python.org/doc/essays/styleguide/
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Some parts of the process_token method is based from The Tab Nanny std module.
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"""
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import tokenize
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from functools import reduce # pylint: disable=redefined-builtin
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from tokenize import TokenInfo
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from typing import List
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from astroid import nodes
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from pylint.checkers import BaseTokenChecker
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from pylint.checkers.utils import (
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check_messages,
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is_overload_stub,
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is_protocol_class,
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node_frame_class,
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)
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from pylint.constants import WarningScope
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from pylint.interfaces import IAstroidChecker, IRawChecker, ITokenChecker
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from pylint.utils.pragma_parser import OPTION_PO, PragmaParserError, parse_pragma
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_ASYNC_TOKEN = "async"
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_KEYWORD_TOKENS = [
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"assert",
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"del",
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"elif",
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"except",
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"for",
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"if",
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"in",
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"not",
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"raise",
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"return",
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"while",
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"yield",
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"with",
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]
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_SPACED_OPERATORS = [
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"==",
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"<",
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">",
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"!=",
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"<>",
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"<=",
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">=",
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"+=",
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"-=",
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"*=",
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"**=",
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"/=",
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"//=",
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"&=",
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"|=",
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"^=",
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"%=",
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">>=",
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"<<=",
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]
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_OPENING_BRACKETS = ["(", "[", "{"]
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_CLOSING_BRACKETS = [")", "]", "}"]
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_TAB_LENGTH = 8
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_EOL = frozenset([tokenize.NEWLINE, tokenize.NL, tokenize.COMMENT])
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_JUNK_TOKENS = (tokenize.COMMENT, tokenize.NL)
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# Whitespace checking policy constants
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_MUST = 0
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_MUST_NOT = 1
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_IGNORE = 2
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MSGS = {
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"C0301": (
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"Line too long (%s/%s)",
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"line-too-long",
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"Used when a line is longer than a given number of characters.",
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),
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"C0302": (
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"Too many lines in module (%s/%s)", # was W0302
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"too-many-lines",
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"Used when a module has too many lines, reducing its readability.",
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),
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"C0303": (
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"Trailing whitespace",
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"trailing-whitespace",
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"Used when there is whitespace between the end of a line and the newline.",
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),
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"C0304": (
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"Final newline missing",
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"missing-final-newline",
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"Used when the last line in a file is missing a newline.",
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),
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"C0305": (
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"Trailing newlines",
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"trailing-newlines",
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"Used when there are trailing blank lines in a file.",
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),
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"W0311": (
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"Bad indentation. Found %s %s, expected %s",
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"bad-indentation",
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"Used when an unexpected number of indentation's tabulations or "
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"spaces has been found.",
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),
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"W0301": (
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"Unnecessary semicolon", # was W0106
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"unnecessary-semicolon",
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'Used when a statement is ended by a semi-colon (";"), which '
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"isn't necessary (that's python, not C ;).",
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),
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"C0321": (
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"More than one statement on a single line",
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"multiple-statements",
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"Used when more than on statement are found on the same line.",
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{"scope": WarningScope.NODE},
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),
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"C0325": (
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"Unnecessary parens after %r keyword",
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"superfluous-parens",
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"Used when a single item in parentheses follows an if, for, or "
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"other keyword.",
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),
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"C0327": (
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"Mixed line endings LF and CRLF",
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"mixed-line-endings",
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"Used when there are mixed (LF and CRLF) newline signs in a file.",
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),
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"C0328": (
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"Unexpected line ending format. There is '%s' while it should be '%s'.",
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"unexpected-line-ending-format",
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"Used when there is different newline than expected.",
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),
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}
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def _last_token_on_line_is(tokens, line_end, token):
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return (
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line_end > 0
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and tokens.token(line_end - 1) == token
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or line_end > 1
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and tokens.token(line_end - 2) == token
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and tokens.type(line_end - 1) == tokenize.COMMENT
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)
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# The contexts for hanging indents.
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# A hanging indented dictionary value after :
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HANGING_DICT_VALUE = "dict-value"
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# Hanging indentation in an expression.
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HANGING = "hanging"
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# Hanging indentation in a block header.
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HANGING_BLOCK = "hanging-block"
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# Continued indentation inside an expression.
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CONTINUED = "continued"
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# Continued indentation in a block header.
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CONTINUED_BLOCK = "continued-block"
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SINGLE_LINE = "single"
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WITH_BODY = "multi"
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class TokenWrapper:
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"""A wrapper for readable access to token information."""
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def __init__(self, tokens):
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self._tokens = tokens
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def token(self, idx):
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return self._tokens[idx][1]
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def type(self, idx):
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return self._tokens[idx][0]
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def start_line(self, idx):
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return self._tokens[idx][2][0]
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def start_col(self, idx):
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return self._tokens[idx][2][1]
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def line(self, idx):
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return self._tokens[idx][4]
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class FormatChecker(BaseTokenChecker):
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"""checks for :
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* unauthorized constructions
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* strict indentation
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* line length
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"""
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__implements__ = (ITokenChecker, IAstroidChecker, IRawChecker)
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# configuration section name
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name = "format"
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# messages
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msgs = MSGS
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# configuration options
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# for available dict keys/values see the optik parser 'add_option' method
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options = (
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(
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"max-line-length",
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{
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"default": 100,
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"type": "int",
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"metavar": "<int>",
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"help": "Maximum number of characters on a single line.",
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},
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),
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(
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"ignore-long-lines",
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{
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"type": "regexp",
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"metavar": "<regexp>",
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"default": r"^\s*(# )?<?https?://\S+>?$",
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"help": (
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"Regexp for a line that is allowed to be longer than " "the limit."
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),
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},
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),
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(
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"single-line-if-stmt",
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{
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"default": False,
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"type": "yn",
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"metavar": "<y_or_n>",
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"help": (
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"Allow the body of an if to be on the same "
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"line as the test if there is no else."
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),
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},
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),
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(
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"single-line-class-stmt",
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{
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"default": False,
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"type": "yn",
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"metavar": "<y_or_n>",
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"help": (
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"Allow the body of a class to be on the same "
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"line as the declaration if body contains "
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"single statement."
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),
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},
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),
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(
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"max-module-lines",
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{
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"default": 1000,
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"type": "int",
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"metavar": "<int>",
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"help": "Maximum number of lines in a module.",
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},
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),
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(
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"indent-string",
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{
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"default": " ",
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"type": "non_empty_string",
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"metavar": "<string>",
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"help": "String used as indentation unit. This is usually "
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'" " (4 spaces) or "\\t" (1 tab).',
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},
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),
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(
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"indent-after-paren",
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{
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"type": "int",
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"metavar": "<int>",
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"default": 4,
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"help": "Number of spaces of indent required inside a hanging "
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"or continued line.",
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},
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),
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(
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"expected-line-ending-format",
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{
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"type": "choice",
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"metavar": "<empty or LF or CRLF>",
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"default": "",
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"choices": ["", "LF", "CRLF"],
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"help": (
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"Expected format of line ending, "
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"e.g. empty (any line ending), LF or CRLF."
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),
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},
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),
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)
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def __init__(self, linter=None):
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BaseTokenChecker.__init__(self, linter)
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self._lines = None
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self._visited_lines = None
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self._bracket_stack = [None]
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def new_line(self, tokens, line_end, line_start):
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"""a new line has been encountered, process it if necessary"""
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if _last_token_on_line_is(tokens, line_end, ";"):
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self.add_message("unnecessary-semicolon", line=tokens.start_line(line_end))
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line_num = tokens.start_line(line_start)
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line = tokens.line(line_start)
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if tokens.type(line_start) not in _JUNK_TOKENS:
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self._lines[line_num] = line.split("\n")[0]
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self.check_lines(line, line_num)
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def process_module(self, _module):
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pass
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def _check_keyword_parentheses(self, tokens: List[TokenInfo], start: int) -> None:
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"""Check that there are not unnecessary parens after a keyword.
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Parens are unnecessary if there is exactly one balanced outer pair on a
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line, and it is followed by a colon, and contains no commas (i.e. is not a
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tuple).
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Args:
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tokens: list of Tokens; the entire list of Tokens.
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start: int; the position of the keyword in the token list.
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"""
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# If the next token is not a paren, we're fine.
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if self._bracket_stack[-1] == ":" and tokens[start].string == "for":
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self._bracket_stack.pop()
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if tokens[start + 1].string != "(":
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return
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found_and_or = False
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contains_walrus_operator = False
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walrus_operator_depth = 0
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depth = 0
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keyword_token = str(tokens[start].string)
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line_num = tokens[start].start[0]
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for i in range(start, len(tokens) - 1):
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token = tokens[i]
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# If we hit a newline, then assume any parens were for continuation.
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if token.type == tokenize.NL:
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return
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# Since the walrus operator doesn't exist below python3.8, the tokenizer
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# generates independent tokens
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if (
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token.string == ":=" # <-- python3.8+ path
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or token.string + tokens[i + 1].string == ":="
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):
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contains_walrus_operator = True
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walrus_operator_depth = depth
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if token.string == "(":
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depth += 1
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elif token.string == ")":
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depth -= 1
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if depth:
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continue
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# ')' can't happen after if (foo), since it would be a syntax error.
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if tokens[i + 1].string in (":", ")", "]", "}", "in") or tokens[
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i + 1
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].type in (tokenize.NEWLINE, tokenize.ENDMARKER, tokenize.COMMENT):
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# The empty tuple () is always accepted.
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if contains_walrus_operator and walrus_operator_depth - 1 == depth:
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# Reset variable for possible following expressions
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contains_walrus_operator = False
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continue
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if i == start + 2:
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return
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if keyword_token == "not":
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if not found_and_or:
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self.add_message(
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"superfluous-parens", line=line_num, args=keyword_token
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)
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elif keyword_token in ("return", "yield"):
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self.add_message(
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"superfluous-parens", line=line_num, args=keyword_token
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)
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elif not found_and_or:
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self.add_message(
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"superfluous-parens", line=line_num, args=keyword_token
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)
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return
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elif depth == 1:
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# This is a tuple, which is always acceptable.
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if token[1] == ",":
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return
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# 'and' and 'or' are the only boolean operators with lower precedence
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# than 'not', so parens are only required when they are found.
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if token[1] in ("and", "or"):
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found_and_or = True
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# A yield inside an expression must always be in parentheses,
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# quit early without error.
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elif token[1] == "yield":
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return
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# A generator expression always has a 'for' token in it, and
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# the 'for' token is only legal inside parens when it is in a
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# generator expression. The parens are necessary here, so bail
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# without an error.
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elif token[1] == "for":
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return
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def _prepare_token_dispatcher(self):
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dispatch = {}
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for tokens, handler in [
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(_KEYWORD_TOKENS, self._check_keyword_parentheses),
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]:
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for token in tokens:
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dispatch[token] = handler
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return dispatch
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def process_tokens(self, tokens):
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"""process tokens and search for :
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_ too long lines (i.e. longer than <max_chars>)
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_ optionally bad construct (if given, bad_construct must be a compiled
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regular expression).
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"""
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self._bracket_stack = [None]
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indents = [0]
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check_equal = False
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line_num = 0
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self._lines = {}
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self._visited_lines = {}
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token_handlers = self._prepare_token_dispatcher()
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self._last_line_ending = None
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last_blank_line_num = 0
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for idx, (tok_type, token, start, _, line) in enumerate(tokens):
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if start[0] != line_num:
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line_num = start[0]
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# A tokenizer oddity: if an indented line contains a multi-line
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# docstring, the line member of the INDENT token does not contain
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# the full line; therefore we check the next token on the line.
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if tok_type == tokenize.INDENT:
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self.new_line(TokenWrapper(tokens), idx - 1, idx + 1)
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else:
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self.new_line(TokenWrapper(tokens), idx - 1, idx)
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if tok_type == tokenize.NEWLINE:
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# a program statement, or ENDMARKER, will eventually follow,
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# after some (possibly empty) run of tokens of the form
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# (NL | COMMENT)* (INDENT | DEDENT+)?
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# If an INDENT appears, setting check_equal is wrong, and will
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# be undone when we see the INDENT.
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check_equal = True
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self._check_line_ending(token, line_num)
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elif tok_type == tokenize.INDENT:
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check_equal = False
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self.check_indent_level(token, indents[-1] + 1, line_num)
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indents.append(indents[-1] + 1)
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elif tok_type == tokenize.DEDENT:
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# there's nothing we need to check here! what's important is
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# that when the run of DEDENTs ends, the indentation of the
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# program statement (or ENDMARKER) that triggered the run is
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# equal to what's left at the top of the indents stack
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check_equal = True
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if len(indents) > 1:
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del indents[-1]
|
||
elif tok_type == tokenize.NL:
|
||
if not line.strip("\r\n"):
|
||
last_blank_line_num = line_num
|
||
elif tok_type not in (tokenize.COMMENT, tokenize.ENCODING):
|
||
# This is the first concrete token following a NEWLINE, so it
|
||
# must be the first token of the next program statement, or an
|
||
# ENDMARKER; the "line" argument exposes the leading whitespace
|
||
# for this statement; in the case of ENDMARKER, line is an empty
|
||
# string, so will properly match the empty string with which the
|
||
# "indents" stack was seeded
|
||
if check_equal:
|
||
check_equal = False
|
||
self.check_indent_level(line, indents[-1], line_num)
|
||
|
||
if tok_type == tokenize.NUMBER and token.endswith("l"):
|
||
self.add_message("lowercase-l-suffix", line=line_num)
|
||
|
||
try:
|
||
handler = token_handlers[token]
|
||
except KeyError:
|
||
pass
|
||
else:
|
||
handler(tokens, idx)
|
||
|
||
line_num -= 1 # to be ok with "wc -l"
|
||
if line_num > self.config.max_module_lines:
|
||
# Get the line where the too-many-lines (or its message id)
|
||
# was disabled or default to 1.
|
||
message_definition = self.linter.msgs_store.get_message_definitions(
|
||
"too-many-lines"
|
||
)[0]
|
||
names = (message_definition.msgid, "too-many-lines")
|
||
line = next(filter(None, map(self.linter._pragma_lineno.get, names)), 1)
|
||
self.add_message(
|
||
"too-many-lines",
|
||
args=(line_num, self.config.max_module_lines),
|
||
line=line,
|
||
)
|
||
|
||
# See if there are any trailing lines. Do not complain about empty
|
||
# files like __init__.py markers.
|
||
if line_num == last_blank_line_num and line_num > 0:
|
||
self.add_message("trailing-newlines", line=line_num)
|
||
|
||
def _check_line_ending(self, line_ending, line_num):
|
||
# check if line endings are mixed
|
||
if self._last_line_ending is not None:
|
||
# line_ending == "" indicates a synthetic newline added at
|
||
# the end of a file that does not, in fact, end with a
|
||
# newline.
|
||
if line_ending and line_ending != self._last_line_ending:
|
||
self.add_message("mixed-line-endings", line=line_num)
|
||
|
||
self._last_line_ending = line_ending
|
||
|
||
# check if line ending is as expected
|
||
expected = self.config.expected_line_ending_format
|
||
if expected:
|
||
# reduce multiple \n\n\n\n to one \n
|
||
line_ending = reduce(lambda x, y: x + y if x != y else x, line_ending, "")
|
||
line_ending = "LF" if line_ending == "\n" else "CRLF"
|
||
if line_ending != expected:
|
||
self.add_message(
|
||
"unexpected-line-ending-format",
|
||
args=(line_ending, expected),
|
||
line=line_num,
|
||
)
|
||
|
||
@check_messages("multiple-statements")
|
||
def visit_default(self, node):
|
||
"""check the node line number and check it if not yet done"""
|
||
if not node.is_statement:
|
||
return
|
||
if not node.root().pure_python:
|
||
return
|
||
prev_sibl = node.previous_sibling()
|
||
if prev_sibl is not None:
|
||
prev_line = prev_sibl.fromlineno
|
||
# The line on which a finally: occurs in a try/finally
|
||
# is not directly represented in the AST. We infer it
|
||
# by taking the last line of the body and adding 1, which
|
||
# should be the line of finally:
|
||
elif (
|
||
isinstance(node.parent, nodes.TryFinally) and node in node.parent.finalbody
|
||
):
|
||
prev_line = node.parent.body[0].tolineno + 1
|
||
else:
|
||
prev_line = node.parent.statement().fromlineno
|
||
line = node.fromlineno
|
||
assert line, node
|
||
if prev_line == line and self._visited_lines.get(line) != 2:
|
||
self._check_multi_statement_line(node, line)
|
||
return
|
||
if line in self._visited_lines:
|
||
return
|
||
try:
|
||
tolineno = node.blockstart_tolineno
|
||
except AttributeError:
|
||
tolineno = node.tolineno
|
||
assert tolineno, node
|
||
lines = []
|
||
for line in range(line, tolineno + 1):
|
||
self._visited_lines[line] = 1
|
||
try:
|
||
lines.append(self._lines[line].rstrip())
|
||
except KeyError:
|
||
lines.append("")
|
||
|
||
def _check_multi_statement_line(self, node, line):
|
||
"""Check for lines containing multiple statements."""
|
||
# Do not warn about multiple nested context managers
|
||
# in with statements.
|
||
if isinstance(node, nodes.With):
|
||
return
|
||
# For try... except... finally..., the two nodes
|
||
# appear to be on the same line due to how the AST is built.
|
||
if isinstance(node, nodes.TryExcept) and isinstance(
|
||
node.parent, nodes.TryFinally
|
||
):
|
||
return
|
||
if (
|
||
isinstance(node.parent, nodes.If)
|
||
and not node.parent.orelse
|
||
and self.config.single_line_if_stmt
|
||
):
|
||
return
|
||
if (
|
||
isinstance(node.parent, nodes.ClassDef)
|
||
and len(node.parent.body) == 1
|
||
and self.config.single_line_class_stmt
|
||
):
|
||
return
|
||
|
||
# Function overloads that use ``Ellipsis`` are exempted.
|
||
if isinstance(node, nodes.Expr) and (
|
||
isinstance(node.value, nodes.Ellipsis)
|
||
or (isinstance(node.value, nodes.Const) and node.value.value is Ellipsis)
|
||
):
|
||
frame = node.frame()
|
||
if is_overload_stub(frame) or is_protocol_class(node_frame_class(frame)):
|
||
return
|
||
|
||
self.add_message("multiple-statements", node=node)
|
||
self._visited_lines[line] = 2
|
||
|
||
def check_line_ending(self, line: str, i: int) -> None:
|
||
"""
|
||
Check that the final newline is not missing and that there is no trailing whitespace.
|
||
"""
|
||
if not line.endswith("\n"):
|
||
self.add_message("missing-final-newline", line=i)
|
||
return
|
||
# exclude \f (formfeed) from the rstrip
|
||
stripped_line = line.rstrip("\t\n\r\v ")
|
||
if line[len(stripped_line) :] not in ("\n", "\r\n"):
|
||
self.add_message(
|
||
"trailing-whitespace", line=i, col_offset=len(stripped_line)
|
||
)
|
||
|
||
def check_line_length(self, line: str, i: int) -> None:
|
||
"""
|
||
Check that the line length is less than the authorized value
|
||
"""
|
||
max_chars = self.config.max_line_length
|
||
ignore_long_line = self.config.ignore_long_lines
|
||
line = line.rstrip()
|
||
if len(line) > max_chars and not ignore_long_line.search(line):
|
||
self.add_message("line-too-long", line=i, args=(len(line), max_chars))
|
||
|
||
@staticmethod
|
||
def remove_pylint_option_from_lines(options_pattern_obj) -> str:
|
||
"""
|
||
Remove the `# pylint ...` pattern from lines
|
||
"""
|
||
lines = options_pattern_obj.string
|
||
purged_lines = (
|
||
lines[: options_pattern_obj.start(1)].rstrip()
|
||
+ lines[options_pattern_obj.end(1) :]
|
||
)
|
||
return purged_lines
|
||
|
||
@staticmethod
|
||
def is_line_length_check_activated(pylint_pattern_match_object) -> bool:
|
||
"""
|
||
Return true if the line length check is activated
|
||
"""
|
||
try:
|
||
for pragma in parse_pragma(pylint_pattern_match_object.group(2)):
|
||
if pragma.action == "disable" and "line-too-long" in pragma.messages:
|
||
return False
|
||
except PragmaParserError:
|
||
# Printing useful information dealing with this error is done in the lint package
|
||
pass
|
||
return True
|
||
|
||
@staticmethod
|
||
def specific_splitlines(lines: str) -> List[str]:
|
||
"""
|
||
Split lines according to universal newlines except those in a specific sets
|
||
"""
|
||
unsplit_ends = {
|
||
"\v",
|
||
"\x0b",
|
||
"\f",
|
||
"\x0c",
|
||
"\x1c",
|
||
"\x1d",
|
||
"\x1e",
|
||
"\x85",
|
||
"\u2028",
|
||
"\u2029",
|
||
}
|
||
res = []
|
||
buffer = ""
|
||
for atomic_line in lines.splitlines(True):
|
||
if atomic_line[-1] not in unsplit_ends:
|
||
res.append(buffer + atomic_line)
|
||
buffer = ""
|
||
else:
|
||
buffer += atomic_line
|
||
return res
|
||
|
||
def check_lines(self, lines: str, lineno: int) -> None:
|
||
"""
|
||
Check lines have :
|
||
- a final newline
|
||
- no trailing whitespace
|
||
- less than a maximum number of characters
|
||
"""
|
||
# By default, check the line length
|
||
check_l_length = True
|
||
|
||
# Line length check may be deactivated through `pylint: disable` comment
|
||
mobj = OPTION_PO.search(lines)
|
||
if mobj:
|
||
check_l_length = self.is_line_length_check_activated(mobj)
|
||
# The 'pylint: disable whatever' should not be taken into account for line length count
|
||
lines = self.remove_pylint_option_from_lines(mobj)
|
||
|
||
for line in self.specific_splitlines(lines):
|
||
if check_l_length:
|
||
self.check_line_length(line, lineno)
|
||
self.check_line_ending(line, lineno)
|
||
lineno += 1
|
||
|
||
def check_indent_level(self, string, expected, line_num):
|
||
"""return the indent level of the string
|
||
"""
|
||
indent = self.config.indent_string
|
||
if indent == "\\t": # \t is not interpreted in the configuration file
|
||
indent = "\t"
|
||
level = 0
|
||
unit_size = len(indent)
|
||
while string[:unit_size] == indent:
|
||
string = string[unit_size:]
|
||
level += 1
|
||
suppl = ""
|
||
while string and string[0] in " \t":
|
||
suppl += string[0]
|
||
string = string[1:]
|
||
if level != expected or suppl:
|
||
i_type = "spaces"
|
||
if indent[0] == "\t":
|
||
i_type = "tabs"
|
||
self.add_message(
|
||
"bad-indentation",
|
||
line=line_num,
|
||
args=(level * unit_size + len(suppl), i_type, expected * unit_size),
|
||
)
|
||
|
||
|
||
def register(linter):
|
||
"""required method to auto register this checker """
|
||
linter.register_checker(FormatChecker(linter))
|