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Summary: Primarily to avoid false positives: http://pypi.python.org/pypi/pep8#id1 Test Plan: $ arc lint --engine ComprehensiveLintEngine externals/pep8/pep8.py # after uncommenting externals/ check Saw 9 errors, haha. Reviewers: epriestley Reviewed By: epriestley CC: aran, Korvin Differential Revision: https://secure.phabricator.com/D4260
1945 lines
70 KiB
Python
1945 lines
70 KiB
Python
#!/usr/bin/env python
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# pep8.py - Check Python source code formatting, according to PEP 8
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# Copyright (C) 2006-2009 Johann C. Rocholl <johann@rocholl.net>
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# Copyright (C) 2009-2012 Florent Xicluna <florent.xicluna@gmail.com>
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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r"""
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Check Python source code formatting, according to PEP 8:
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http://www.python.org/dev/peps/pep-0008/
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For usage and a list of options, try this:
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$ python pep8.py -h
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This program and its regression test suite live here:
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http://github.com/jcrocholl/pep8
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Groups of errors and warnings:
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E errors
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W warnings
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100 indentation
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200 whitespace
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300 blank lines
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400 imports
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500 line length
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600 deprecation
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700 statements
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900 syntax error
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You can add checks to this program by writing plugins. Each plugin is
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a simple function that is called for each line of source code, either
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physical or logical.
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Physical line:
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- Raw line of text from the input file.
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Logical line:
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- Multi-line statements converted to a single line.
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- Stripped left and right.
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- Contents of strings replaced with 'xxx' of same length.
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- Comments removed.
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The check function requests physical or logical lines by the name of
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the first argument:
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def maximum_line_length(physical_line)
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def extraneous_whitespace(logical_line)
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def blank_lines(logical_line, blank_lines, indent_level, line_number)
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The last example above demonstrates how check plugins can request
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additional information with extra arguments. All attributes of the
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Checker object are available. Some examples:
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lines: a list of the raw lines from the input file
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tokens: the tokens that contribute to this logical line
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line_number: line number in the input file
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blank_lines: blank lines before this one
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indent_char: first indentation character in this file (' ' or '\t')
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indent_level: indentation (with tabs expanded to multiples of 8)
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previous_indent_level: indentation on previous line
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previous_logical: previous logical line
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The docstring of each check function shall be the relevant part of
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text from PEP 8. It is printed if the user enables --show-pep8.
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Several docstrings contain examples directly from the PEP 8 document.
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Okay: spam(ham[1], {eggs: 2})
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E201: spam( ham[1], {eggs: 2})
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These examples are verified automatically when pep8.py is run with the
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--doctest option. You can add examples for your own check functions.
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The format is simple: "Okay" or error/warning code followed by colon
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and space, the rest of the line is example source code. If you put 'r'
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before the docstring, you can use \n for newline, \t for tab and \s
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for space.
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"""
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__version__ = '1.3.4'
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import os
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import sys
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import re
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import time
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import inspect
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import keyword
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import tokenize
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from optparse import OptionParser
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from fnmatch import fnmatch
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try:
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from configparser import RawConfigParser
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from io import TextIOWrapper
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except ImportError:
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from ConfigParser import RawConfigParser
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DEFAULT_EXCLUDE = '.svn,CVS,.bzr,.hg,.git'
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DEFAULT_IGNORE = 'E24'
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if sys.platform == 'win32':
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DEFAULT_CONFIG = os.path.expanduser(r'~\.pep8')
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else:
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DEFAULT_CONFIG = os.path.join(os.getenv('XDG_CONFIG_HOME') or
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os.path.expanduser('~/.config'), 'pep8')
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MAX_LINE_LENGTH = 79
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REPORT_FORMAT = {
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'default': '%(path)s:%(row)d:%(col)d: %(code)s %(text)s',
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'pylint': '%(path)s:%(row)d: [%(code)s] %(text)s',
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}
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SINGLETONS = frozenset(['False', 'None', 'True'])
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KEYWORDS = frozenset(keyword.kwlist + ['print']) - SINGLETONS
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BINARY_OPERATORS = frozenset([
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'**=', '*=', '+=', '-=', '!=', '<>',
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'%=', '^=', '&=', '|=', '==', '/=', '//=', '<=', '>=', '<<=', '>>=',
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'%', '^', '&', '|', '=', '/', '//', '<', '>', '<<'])
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UNARY_OPERATORS = frozenset(['>>', '**', '*', '+', '-'])
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OPERATORS = BINARY_OPERATORS | UNARY_OPERATORS
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WHITESPACE = frozenset(' \t')
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SKIP_TOKENS = frozenset([tokenize.COMMENT, tokenize.NL, tokenize.NEWLINE,
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tokenize.INDENT, tokenize.DEDENT])
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BENCHMARK_KEYS = ['directories', 'files', 'logical lines', 'physical lines']
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INDENT_REGEX = re.compile(r'([ \t]*)')
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RAISE_COMMA_REGEX = re.compile(r'raise\s+\w+\s*(,)')
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RERAISE_COMMA_REGEX = re.compile(r'raise\s+\w+\s*,\s*\w+\s*,\s*\w+')
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SELFTEST_REGEX = re.compile(r'(Okay|[EW]\d{3}):\s(.*)')
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ERRORCODE_REGEX = re.compile(r'[EW]\d{3}')
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DOCSTRING_REGEX = re.compile(r'u?r?["\']')
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EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
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WHITESPACE_AFTER_COMMA_REGEX = re.compile(r'[,;:]\s*(?: |\t)')
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COMPARE_SINGLETON_REGEX = re.compile(r'([=!]=)\s*(None|False|True)')
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COMPARE_TYPE_REGEX = re.compile(r'([=!]=|is|is\s+not)\s*type(?:s\.(\w+)Type'
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r'|\(\s*(\(\s*\)|[^)]*[^ )])\s*\))')
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KEYWORD_REGEX = re.compile(r'(?:[^\s]|\b)(\s*)\b(?:%s)\b(\s*)' %
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r'|'.join(KEYWORDS))
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OPERATOR_REGEX = re.compile(r'(?:[^,\s])(\s*)(?:[-+*/|!<=>%&^]+)(\s*)')
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LAMBDA_REGEX = re.compile(r'\blambda\b')
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HUNK_REGEX = re.compile(r'^@@ -\d+(?:,\d+)? \+(\d+)(?:,(\d+))? @@.*$')
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# Work around Python < 2.6 behaviour, which does not generate NL after
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# a comment which is on a line by itself.
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COMMENT_WITH_NL = tokenize.generate_tokens(['#\n'].pop).send(None)[1] == '#\n'
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##############################################################################
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# Plugins (check functions) for physical lines
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##############################################################################
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def tabs_or_spaces(physical_line, indent_char):
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r"""
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Never mix tabs and spaces.
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The most popular way of indenting Python is with spaces only. The
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second-most popular way is with tabs only. Code indented with a mixture
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of tabs and spaces should be converted to using spaces exclusively. When
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invoking the Python command line interpreter with the -t option, it issues
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warnings about code that illegally mixes tabs and spaces. When using -tt
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these warnings become errors. These options are highly recommended!
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Okay: if a == 0:\n a = 1\n b = 1
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E101: if a == 0:\n a = 1\n\tb = 1
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"""
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indent = INDENT_REGEX.match(physical_line).group(1)
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for offset, char in enumerate(indent):
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if char != indent_char:
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return offset, "E101 indentation contains mixed spaces and tabs"
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def tabs_obsolete(physical_line):
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r"""
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For new projects, spaces-only are strongly recommended over tabs. Most
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editors have features that make this easy to do.
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Okay: if True:\n return
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W191: if True:\n\treturn
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"""
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indent = INDENT_REGEX.match(physical_line).group(1)
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if '\t' in indent:
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return indent.index('\t'), "W191 indentation contains tabs"
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def trailing_whitespace(physical_line):
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r"""
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JCR: Trailing whitespace is superfluous.
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FBM: Except when it occurs as part of a blank line (i.e. the line is
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nothing but whitespace). According to Python docs[1] a line with only
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whitespace is considered a blank line, and is to be ignored. However,
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matching a blank line to its indentation level avoids mistakenly
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terminating a multi-line statement (e.g. class declaration) when
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pasting code into the standard Python interpreter.
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[1] http://docs.python.org/reference/lexical_analysis.html#blank-lines
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The warning returned varies on whether the line itself is blank, for easier
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filtering for those who want to indent their blank lines.
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Okay: spam(1)
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W291: spam(1)\s
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W293: class Foo(object):\n \n bang = 12
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"""
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physical_line = physical_line.rstrip('\n') # chr(10), newline
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physical_line = physical_line.rstrip('\r') # chr(13), carriage return
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physical_line = physical_line.rstrip('\x0c') # chr(12), form feed, ^L
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stripped = physical_line.rstrip(' \t\v')
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if physical_line != stripped:
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if stripped:
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return len(stripped), "W291 trailing whitespace"
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else:
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return 0, "W293 blank line contains whitespace"
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def trailing_blank_lines(physical_line, lines, line_number):
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r"""
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JCR: Trailing blank lines are superfluous.
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Okay: spam(1)
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W391: spam(1)\n
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"""
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if not physical_line.rstrip() and line_number == len(lines):
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return 0, "W391 blank line at end of file"
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def missing_newline(physical_line):
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"""
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JCR: The last line should have a newline.
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Reports warning W292.
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"""
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if physical_line.rstrip() == physical_line:
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return len(physical_line), "W292 no newline at end of file"
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def maximum_line_length(physical_line, max_line_length):
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"""
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Limit all lines to a maximum of 79 characters.
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There are still many devices around that are limited to 80 character
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lines; plus, limiting windows to 80 characters makes it possible to have
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several windows side-by-side. The default wrapping on such devices looks
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ugly. Therefore, please limit all lines to a maximum of 79 characters.
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For flowing long blocks of text (docstrings or comments), limiting the
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length to 72 characters is recommended.
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Reports error E501.
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"""
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line = physical_line.rstrip()
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length = len(line)
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if length > max_line_length:
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if hasattr(line, 'decode'): # Python 2
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# The line could contain multi-byte characters
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try:
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length = len(line.decode('utf-8'))
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except UnicodeError:
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pass
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if length > max_line_length:
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return (max_line_length, "E501 line too long "
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"(%d > %d characters)" % (length, max_line_length))
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##############################################################################
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# Plugins (check functions) for logical lines
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##############################################################################
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def blank_lines(logical_line, blank_lines, indent_level, line_number,
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previous_logical, previous_indent_level):
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r"""
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Separate top-level function and class definitions with two blank lines.
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Method definitions inside a class are separated by a single blank line.
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Extra blank lines may be used (sparingly) to separate groups of related
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functions. Blank lines may be omitted between a bunch of related
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one-liners (e.g. a set of dummy implementations).
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Use blank lines in functions, sparingly, to indicate logical sections.
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Okay: def a():\n pass\n\n\ndef b():\n pass
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Okay: def a():\n pass\n\n\n# Foo\n# Bar\n\ndef b():\n pass
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E301: class Foo:\n b = 0\n def bar():\n pass
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E302: def a():\n pass\n\ndef b(n):\n pass
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E303: def a():\n pass\n\n\n\ndef b(n):\n pass
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E303: def a():\n\n\n\n pass
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E304: @decorator\n\ndef a():\n pass
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"""
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if line_number == 1:
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return # Don't expect blank lines before the first line
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if previous_logical.startswith('@'):
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if blank_lines:
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yield 0, "E304 blank lines found after function decorator"
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elif blank_lines > 2 or (indent_level and blank_lines == 2):
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yield 0, "E303 too many blank lines (%d)" % blank_lines
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elif logical_line.startswith(('def ', 'class ', '@')):
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if indent_level:
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if not (blank_lines or previous_indent_level < indent_level or
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DOCSTRING_REGEX.match(previous_logical)):
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yield 0, "E301 expected 1 blank line, found 0"
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elif blank_lines != 2:
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yield 0, "E302 expected 2 blank lines, found %d" % blank_lines
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def extraneous_whitespace(logical_line):
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"""
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Avoid extraneous whitespace in the following situations:
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- Immediately inside parentheses, brackets or braces.
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- Immediately before a comma, semicolon, or colon.
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Okay: spam(ham[1], {eggs: 2})
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E201: spam( ham[1], {eggs: 2})
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E201: spam(ham[ 1], {eggs: 2})
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E201: spam(ham[1], { eggs: 2})
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E202: spam(ham[1], {eggs: 2} )
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E202: spam(ham[1 ], {eggs: 2})
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E202: spam(ham[1], {eggs: 2 })
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E203: if x == 4: print x, y; x, y = y , x
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E203: if x == 4: print x, y ; x, y = y, x
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E203: if x == 4 : print x, y; x, y = y, x
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"""
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line = logical_line
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for match in EXTRANEOUS_WHITESPACE_REGEX.finditer(line):
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text = match.group()
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char = text.strip()
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found = match.start()
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if text == char + ' ':
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# assert char in '([{'
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yield found + 1, "E201 whitespace after '%s'" % char
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elif line[found - 1] != ',':
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code = ('E202' if char in '}])' else 'E203') # if char in ',;:'
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yield found, "%s whitespace before '%s'" % (code, char)
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def whitespace_around_keywords(logical_line):
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r"""
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Avoid extraneous whitespace around keywords.
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Okay: True and False
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E271: True and False
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E272: True and False
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E273: True and\tFalse
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E274: True\tand False
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"""
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for match in KEYWORD_REGEX.finditer(logical_line):
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before, after = match.groups()
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if '\t' in before:
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yield match.start(1), "E274 tab before keyword"
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elif len(before) > 1:
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yield match.start(1), "E272 multiple spaces before keyword"
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if '\t' in after:
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yield match.start(2), "E273 tab after keyword"
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elif len(after) > 1:
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yield match.start(2), "E271 multiple spaces after keyword"
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def missing_whitespace(logical_line):
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"""
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JCR: Each comma, semicolon or colon should be followed by whitespace.
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Okay: [a, b]
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Okay: (3,)
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Okay: a[1:4]
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Okay: a[:4]
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Okay: a[1:]
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Okay: a[1:4:2]
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E231: ['a','b']
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E231: foo(bar,baz)
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E231: [{'a':'b'}]
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"""
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line = logical_line
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for index in range(len(line) - 1):
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char = line[index]
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if char in ',;:' and line[index + 1] not in WHITESPACE:
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before = line[:index]
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if char == ':' and before.count('[') > before.count(']') and \
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before.rfind('{') < before.rfind('['):
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continue # Slice syntax, no space required
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if char == ',' and line[index + 1] == ')':
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continue # Allow tuple with only one element: (3,)
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yield index, "E231 missing whitespace after '%s'" % char
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def indentation(logical_line, previous_logical, indent_char,
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indent_level, previous_indent_level):
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r"""
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Use 4 spaces per indentation level.
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For really old code that you don't want to mess up, you can continue to
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use 8-space tabs.
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Okay: a = 1
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Okay: if a == 0:\n a = 1
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E111: a = 1
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Okay: for item in items:\n pass
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E112: for item in items:\npass
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Okay: a = 1\nb = 2
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E113: a = 1\n b = 2
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"""
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if indent_char == ' ' and indent_level % 4:
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yield 0, "E111 indentation is not a multiple of four"
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indent_expect = previous_logical.endswith(':')
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if indent_expect and indent_level <= previous_indent_level:
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yield 0, "E112 expected an indented block"
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if indent_level > previous_indent_level and not indent_expect:
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yield 0, "E113 unexpected indentation"
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def continuation_line_indentation(logical_line, tokens, indent_level, verbose):
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r"""
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Continuation lines should align wrapped elements either vertically using
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Python's implicit line joining inside parentheses, brackets and braces, or
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using a hanging indent.
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When using a hanging indent the following considerations should be applied:
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- there should be no arguments on the first line, and
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- further indentation should be used to clearly distinguish itself as a
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continuation line.
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Okay: a = (\n)
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E123: a = (\n )
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Okay: a = (\n 42)
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E121: a = (\n 42)
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E122: a = (\n42)
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E123: a = (\n 42\n )
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E124: a = (24,\n 42\n)
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E125: if (a or\n b):\n pass
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E126: a = (\n 42)
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E127: a = (24,\n 42)
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E128: a = (24,\n 42)
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"""
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first_row = tokens[0][2][0]
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nrows = 1 + tokens[-1][2][0] - first_row
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if nrows == 1:
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return
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# indent_next tells us whether the next block is indented; assuming
|
|
# that it is indented by 4 spaces, then we should not allow 4-space
|
|
# indents on the final continuation line; in turn, some other
|
|
# indents are allowed to have an extra 4 spaces.
|
|
indent_next = logical_line.endswith(':')
|
|
|
|
row = depth = 0
|
|
# remember how many brackets were opened on each line
|
|
parens = [0] * nrows
|
|
# relative indents of physical lines
|
|
rel_indent = [0] * nrows
|
|
# visual indents
|
|
indent = [indent_level]
|
|
indent_chances = {}
|
|
last_indent = tokens[0][2]
|
|
if verbose >= 3:
|
|
print(">>> " + tokens[0][4].rstrip())
|
|
|
|
for token_type, text, start, end, line in tokens:
|
|
newline = row < start[0] - first_row
|
|
if newline:
|
|
row = start[0] - first_row
|
|
newline = (not last_token_multiline and
|
|
token_type not in (tokenize.NL, tokenize.NEWLINE))
|
|
|
|
if newline:
|
|
# this is the beginning of a continuation line.
|
|
last_indent = start
|
|
if verbose >= 3:
|
|
print("... " + line.rstrip())
|
|
|
|
# record the initial indent.
|
|
rel_indent[row] = start[1] - indent_level
|
|
|
|
if depth:
|
|
# a bracket expression in a continuation line.
|
|
# find the line that it was opened on
|
|
for open_row in range(row - 1, -1, -1):
|
|
if parens[open_row]:
|
|
break
|
|
else:
|
|
# an unbracketed continuation line (ie, backslash)
|
|
open_row = 0
|
|
hang = rel_indent[row] - rel_indent[open_row]
|
|
visual_indent = indent_chances.get(start[1])
|
|
|
|
if token_type == tokenize.OP and text in ']})':
|
|
# this line starts with a closing bracket
|
|
if indent[depth]:
|
|
if start[1] != indent[depth]:
|
|
yield (start, 'E124 closing bracket does not match '
|
|
'visual indentation')
|
|
elif hang:
|
|
yield (start, 'E123 closing bracket does not match '
|
|
'indentation of opening bracket\'s line')
|
|
elif visual_indent is True:
|
|
# visual indent is verified
|
|
if not indent[depth]:
|
|
indent[depth] = start[1]
|
|
elif visual_indent in (text, str):
|
|
# ignore token lined up with matching one from a previous line
|
|
pass
|
|
elif indent[depth] and start[1] < indent[depth]:
|
|
# visual indent is broken
|
|
yield (start, 'E128 continuation line '
|
|
'under-indented for visual indent')
|
|
elif hang == 4 or (indent_next and rel_indent[row] == 8):
|
|
# hanging indent is verified
|
|
pass
|
|
else:
|
|
# indent is broken
|
|
if hang <= 0:
|
|
error = 'E122', 'missing indentation or outdented'
|
|
elif indent[depth]:
|
|
error = 'E127', 'over-indented for visual indent'
|
|
elif hang % 4:
|
|
error = 'E121', 'indentation is not a multiple of four'
|
|
else:
|
|
error = 'E126', 'over-indented for hanging indent'
|
|
yield start, "%s continuation line %s" % error
|
|
|
|
# look for visual indenting
|
|
if (parens[row] and token_type not in (tokenize.NL, tokenize.COMMENT)
|
|
and not indent[depth]):
|
|
indent[depth] = start[1]
|
|
indent_chances[start[1]] = True
|
|
if verbose >= 4:
|
|
print("bracket depth %s indent to %s" % (depth, start[1]))
|
|
# deal with implicit string concatenation
|
|
elif (token_type in (tokenize.STRING, tokenize.COMMENT) or
|
|
text in ('u', 'ur', 'b', 'br')):
|
|
indent_chances[start[1]] = str
|
|
|
|
# keep track of bracket depth
|
|
if token_type == tokenize.OP:
|
|
if text in '([{':
|
|
depth += 1
|
|
indent.append(0)
|
|
parens[row] += 1
|
|
if verbose >= 4:
|
|
print("bracket depth %s seen, col %s, visual min = %s" %
|
|
(depth, start[1], indent[depth]))
|
|
elif text in ')]}' and depth > 0:
|
|
# parent indents should not be more than this one
|
|
prev_indent = indent.pop() or last_indent[1]
|
|
for d in range(depth):
|
|
if indent[d] > prev_indent:
|
|
indent[d] = 0
|
|
for ind in list(indent_chances):
|
|
if ind >= prev_indent:
|
|
del indent_chances[ind]
|
|
depth -= 1
|
|
if depth:
|
|
indent_chances[indent[depth]] = True
|
|
for idx in range(row, -1, -1):
|
|
if parens[idx]:
|
|
parens[idx] -= 1
|
|
break
|
|
assert len(indent) == depth + 1
|
|
if start[1] not in indent_chances:
|
|
# allow to line up tokens
|
|
indent_chances[start[1]] = text
|
|
|
|
last_token_multiline = (start[0] != end[0])
|
|
|
|
if indent_next and rel_indent[-1] == 4:
|
|
yield (last_indent, "E125 continuation line does not distinguish "
|
|
"itself from next logical line")
|
|
|
|
|
|
def whitespace_before_parameters(logical_line, tokens):
|
|
"""
|
|
Avoid extraneous whitespace in the following situations:
|
|
|
|
- Immediately before the open parenthesis that starts the argument
|
|
list of a function call.
|
|
|
|
- Immediately before the open parenthesis that starts an indexing or
|
|
slicing.
|
|
|
|
Okay: spam(1)
|
|
E211: spam (1)
|
|
|
|
Okay: dict['key'] = list[index]
|
|
E211: dict ['key'] = list[index]
|
|
E211: dict['key'] = list [index]
|
|
"""
|
|
prev_type = tokens[0][0]
|
|
prev_text = tokens[0][1]
|
|
prev_end = tokens[0][3]
|
|
for index in range(1, len(tokens)):
|
|
token_type, text, start, end, line = tokens[index]
|
|
if (token_type == tokenize.OP and
|
|
text in '([' and
|
|
start != prev_end and
|
|
(prev_type == tokenize.NAME or prev_text in '}])') and
|
|
# Syntax "class A (B):" is allowed, but avoid it
|
|
(index < 2 or tokens[index - 2][1] != 'class') and
|
|
# Allow "return (a.foo for a in range(5))"
|
|
not keyword.iskeyword(prev_text)):
|
|
yield prev_end, "E211 whitespace before '%s'" % text
|
|
prev_type = token_type
|
|
prev_text = text
|
|
prev_end = end
|
|
|
|
|
|
def whitespace_around_operator(logical_line):
|
|
r"""
|
|
Avoid extraneous whitespace in the following situations:
|
|
|
|
- More than one space around an assignment (or other) operator to
|
|
align it with another.
|
|
|
|
Okay: a = 12 + 3
|
|
E221: a = 4 + 5
|
|
E222: a = 4 + 5
|
|
E223: a = 4\t+ 5
|
|
E224: a = 4 +\t5
|
|
"""
|
|
for match in OPERATOR_REGEX.finditer(logical_line):
|
|
before, after = match.groups()
|
|
|
|
if '\t' in before:
|
|
yield match.start(1), "E223 tab before operator"
|
|
elif len(before) > 1:
|
|
yield match.start(1), "E221 multiple spaces before operator"
|
|
|
|
if '\t' in after:
|
|
yield match.start(2), "E224 tab after operator"
|
|
elif len(after) > 1:
|
|
yield match.start(2), "E222 multiple spaces after operator"
|
|
|
|
|
|
def missing_whitespace_around_operator(logical_line, tokens):
|
|
r"""
|
|
- Always surround these binary operators with a single space on
|
|
either side: assignment (=), augmented assignment (+=, -= etc.),
|
|
comparisons (==, <, >, !=, <>, <=, >=, in, not in, is, is not),
|
|
Booleans (and, or, not).
|
|
|
|
- Use spaces around arithmetic operators.
|
|
|
|
Okay: i = i + 1
|
|
Okay: submitted += 1
|
|
Okay: x = x * 2 - 1
|
|
Okay: hypot2 = x * x + y * y
|
|
Okay: c = (a + b) * (a - b)
|
|
Okay: foo(bar, key='word', *args, **kwargs)
|
|
Okay: baz(**kwargs)
|
|
Okay: negative = -1
|
|
Okay: spam(-1)
|
|
Okay: alpha[:-i]
|
|
Okay: if not -5 < x < +5:\n pass
|
|
Okay: lambda *args, **kw: (args, kw)
|
|
|
|
E225: i=i+1
|
|
E225: submitted +=1
|
|
E225: x = x*2 - 1
|
|
E225: hypot2 = x*x + y*y
|
|
E225: c = (a+b) * (a-b)
|
|
E225: c = alpha -4
|
|
E225: z = x **y
|
|
"""
|
|
parens = 0
|
|
need_space = False
|
|
prev_type = tokenize.OP
|
|
prev_text = prev_end = None
|
|
for token_type, text, start, end, line in tokens:
|
|
if token_type in (tokenize.NL, tokenize.NEWLINE, tokenize.ERRORTOKEN):
|
|
# ERRORTOKEN is triggered by backticks in Python 3000
|
|
continue
|
|
if text in ('(', 'lambda'):
|
|
parens += 1
|
|
elif text == ')':
|
|
parens -= 1
|
|
if need_space:
|
|
if start != prev_end:
|
|
need_space = False
|
|
elif text == '>' and prev_text in ('<', '-'):
|
|
# Tolerate the "<>" operator, even if running Python 3
|
|
# Deal with Python 3's annotated return value "->"
|
|
pass
|
|
else:
|
|
yield prev_end, "E225 missing whitespace around operator"
|
|
need_space = False
|
|
elif token_type == tokenize.OP and prev_end is not None:
|
|
if text == '=' and parens:
|
|
# Allow keyword args or defaults: foo(bar=None).
|
|
pass
|
|
elif text in BINARY_OPERATORS:
|
|
need_space = True
|
|
elif text in UNARY_OPERATORS:
|
|
# Allow unary operators: -123, -x, +1.
|
|
# Allow argument unpacking: foo(*args, **kwargs).
|
|
if prev_type == tokenize.OP:
|
|
if prev_text in '}])':
|
|
need_space = True
|
|
elif prev_type == tokenize.NAME:
|
|
if prev_text not in KEYWORDS:
|
|
need_space = True
|
|
elif prev_type not in SKIP_TOKENS:
|
|
need_space = True
|
|
if need_space and start == prev_end:
|
|
yield prev_end, "E225 missing whitespace around operator"
|
|
need_space = False
|
|
prev_type = token_type
|
|
prev_text = text
|
|
prev_end = end
|
|
|
|
|
|
def whitespace_around_comma(logical_line):
|
|
r"""
|
|
Avoid extraneous whitespace in the following situations:
|
|
|
|
- More than one space around an assignment (or other) operator to
|
|
align it with another.
|
|
|
|
Note: these checks are disabled by default
|
|
|
|
Okay: a = (1, 2)
|
|
E241: a = (1, 2)
|
|
E242: a = (1,\t2)
|
|
"""
|
|
line = logical_line
|
|
for m in WHITESPACE_AFTER_COMMA_REGEX.finditer(line):
|
|
found = m.start() + 1
|
|
if '\t' in m.group():
|
|
yield found, "E242 tab after '%s'" % m.group()[0]
|
|
else:
|
|
yield found, "E241 multiple spaces after '%s'" % m.group()[0]
|
|
|
|
|
|
def whitespace_around_named_parameter_equals(logical_line, tokens):
|
|
"""
|
|
Don't use spaces around the '=' sign when used to indicate a
|
|
keyword argument or a default parameter value.
|
|
|
|
Okay: def complex(real, imag=0.0):
|
|
Okay: return magic(r=real, i=imag)
|
|
Okay: boolean(a == b)
|
|
Okay: boolean(a != b)
|
|
Okay: boolean(a <= b)
|
|
Okay: boolean(a >= b)
|
|
|
|
E251: def complex(real, imag = 0.0):
|
|
E251: return magic(r = real, i = imag)
|
|
"""
|
|
parens = 0
|
|
no_space = False
|
|
prev_end = None
|
|
for token_type, text, start, end, line in tokens:
|
|
if no_space:
|
|
no_space = False
|
|
if start != prev_end:
|
|
yield (prev_end,
|
|
"E251 no spaces around keyword / parameter equals")
|
|
elif token_type == tokenize.OP:
|
|
if text == '(':
|
|
parens += 1
|
|
elif text == ')':
|
|
parens -= 1
|
|
elif parens and text == '=':
|
|
no_space = True
|
|
if start != prev_end:
|
|
yield (prev_end,
|
|
"E251 no spaces around keyword / parameter equals")
|
|
prev_end = end
|
|
|
|
|
|
def whitespace_before_inline_comment(logical_line, tokens):
|
|
"""
|
|
Separate inline comments by at least two spaces.
|
|
|
|
An inline comment is a comment on the same line as a statement. Inline
|
|
comments should be separated by at least two spaces from the statement.
|
|
They should start with a # and a single space.
|
|
|
|
Okay: x = x + 1 # Increment x
|
|
Okay: x = x + 1 # Increment x
|
|
E261: x = x + 1 # Increment x
|
|
E262: x = x + 1 #Increment x
|
|
E262: x = x + 1 # Increment x
|
|
"""
|
|
prev_end = (0, 0)
|
|
for token_type, text, start, end, line in tokens:
|
|
if token_type == tokenize.COMMENT:
|
|
if not line[:start[1]].strip():
|
|
continue
|
|
if prev_end[0] == start[0] and start[1] < prev_end[1] + 2:
|
|
yield (prev_end,
|
|
"E261 at least two spaces before inline comment")
|
|
if text.startswith('# ') or not text.startswith('# '):
|
|
yield start, "E262 inline comment should start with '# '"
|
|
elif token_type != tokenize.NL:
|
|
prev_end = end
|
|
|
|
|
|
def imports_on_separate_lines(logical_line):
|
|
r"""
|
|
Imports should usually be on separate lines.
|
|
|
|
Okay: import os\nimport sys
|
|
E401: import sys, os
|
|
|
|
Okay: from subprocess import Popen, PIPE
|
|
Okay: from myclas import MyClass
|
|
Okay: from foo.bar.yourclass import YourClass
|
|
Okay: import myclass
|
|
Okay: import foo.bar.yourclass
|
|
"""
|
|
line = logical_line
|
|
if line.startswith('import '):
|
|
found = line.find(',')
|
|
if -1 < found and ';' not in line[:found]:
|
|
yield found, "E401 multiple imports on one line"
|
|
|
|
|
|
def compound_statements(logical_line):
|
|
r"""
|
|
Compound statements (multiple statements on the same line) are
|
|
generally discouraged.
|
|
|
|
While sometimes it's okay to put an if/for/while with a small body
|
|
on the same line, never do this for multi-clause statements. Also
|
|
avoid folding such long lines!
|
|
|
|
Okay: if foo == 'blah':\n do_blah_thing()
|
|
Okay: do_one()
|
|
Okay: do_two()
|
|
Okay: do_three()
|
|
|
|
E701: if foo == 'blah': do_blah_thing()
|
|
E701: for x in lst: total += x
|
|
E701: while t < 10: t = delay()
|
|
E701: if foo == 'blah': do_blah_thing()
|
|
E701: else: do_non_blah_thing()
|
|
E701: try: something()
|
|
E701: finally: cleanup()
|
|
E701: if foo == 'blah': one(); two(); three()
|
|
|
|
E702: do_one(); do_two(); do_three()
|
|
"""
|
|
line = logical_line
|
|
found = line.find(':')
|
|
if -1 < found < len(line) - 1:
|
|
before = line[:found]
|
|
if (before.count('{') <= before.count('}') and # {'a': 1} (dict)
|
|
before.count('[') <= before.count(']') and # [1:2] (slice)
|
|
before.count('(') <= before.count(')') and # (Python 3 annotation)
|
|
not LAMBDA_REGEX.search(before)): # lambda x: x
|
|
yield found, "E701 multiple statements on one line (colon)"
|
|
found = line.find(';')
|
|
if -1 < found:
|
|
yield found, "E702 multiple statements on one line (semicolon)"
|
|
|
|
|
|
def explicit_line_join(logical_line, tokens):
|
|
r"""
|
|
Avoid explicit line join between brackets.
|
|
|
|
The preferred way of wrapping long lines is by using Python's implied line
|
|
continuation inside parentheses, brackets and braces. Long lines can be
|
|
broken over multiple lines by wrapping expressions in parentheses. These
|
|
should be used in preference to using a backslash for line continuation.
|
|
|
|
E502: aaa = [123, \\n 123]
|
|
E502: aaa = ("bbb " \\n "ccc")
|
|
|
|
Okay: aaa = [123,\n 123]
|
|
Okay: aaa = ("bbb "\n "ccc")
|
|
Okay: aaa = "bbb " \\n "ccc"
|
|
"""
|
|
prev_start = prev_end = parens = 0
|
|
for token_type, text, start, end, line in tokens:
|
|
if start[0] != prev_start and parens and backslash:
|
|
yield backslash, "E502 the backslash is redundant between brackets"
|
|
if end[0] != prev_end:
|
|
if line.rstrip('\r\n').endswith('\\'):
|
|
backslash = (end[0], len(line.splitlines()[-1]) - 1)
|
|
else:
|
|
backslash = None
|
|
prev_start = prev_end = end[0]
|
|
else:
|
|
prev_start = start[0]
|
|
if token_type == tokenize.OP:
|
|
if text in '([{':
|
|
parens += 1
|
|
elif text in ')]}':
|
|
parens -= 1
|
|
|
|
|
|
def comparison_to_singleton(logical_line):
|
|
"""
|
|
Comparisons to singletons like None should always be done
|
|
with "is" or "is not", never the equality operators.
|
|
|
|
Okay: if arg is not None:
|
|
E711: if arg != None:
|
|
E712: if arg == True:
|
|
|
|
Also, beware of writing if x when you really mean if x is not None --
|
|
e.g. when testing whether a variable or argument that defaults to None was
|
|
set to some other value. The other value might have a type (such as a
|
|
container) that could be false in a boolean context!
|
|
"""
|
|
match = COMPARE_SINGLETON_REGEX.search(logical_line)
|
|
if match:
|
|
same = (match.group(1) == '==')
|
|
singleton = match.group(2)
|
|
msg = "'if cond is %s:'" % (('' if same else 'not ') + singleton)
|
|
if singleton in ('None',):
|
|
code = 'E711'
|
|
else:
|
|
code = 'E712'
|
|
nonzero = ((singleton == 'True' and same) or
|
|
(singleton == 'False' and not same))
|
|
msg += " or 'if %scond:'" % ('' if nonzero else 'not ')
|
|
yield match.start(1), ("%s comparison to %s should be %s" %
|
|
(code, singleton, msg))
|
|
|
|
|
|
def comparison_type(logical_line):
|
|
"""
|
|
Object type comparisons should always use isinstance() instead of
|
|
comparing types directly.
|
|
|
|
Okay: if isinstance(obj, int):
|
|
E721: if type(obj) is type(1):
|
|
|
|
When checking if an object is a string, keep in mind that it might be a
|
|
unicode string too! In Python 2.3, str and unicode have a common base
|
|
class, basestring, so you can do:
|
|
|
|
Okay: if isinstance(obj, basestring):
|
|
Okay: if type(a1) is type(b1):
|
|
"""
|
|
match = COMPARE_TYPE_REGEX.search(logical_line)
|
|
if match:
|
|
inst = match.group(3)
|
|
if inst and isidentifier(inst) and inst not in SINGLETONS:
|
|
return # Allow comparison for types which are not obvious
|
|
yield match.start(1), "E721 do not compare types, use 'isinstance()'"
|
|
|
|
|
|
def python_3000_has_key(logical_line):
|
|
r"""
|
|
The {}.has_key() method will be removed in the future version of
|
|
Python. Use the 'in' operation instead.
|
|
|
|
Okay: if "alph" in d:\n print d["alph"]
|
|
W601: assert d.has_key('alph')
|
|
"""
|
|
pos = logical_line.find('.has_key(')
|
|
if pos > -1:
|
|
yield pos, "W601 .has_key() is deprecated, use 'in'"
|
|
|
|
|
|
def python_3000_raise_comma(logical_line):
|
|
"""
|
|
When raising an exception, use "raise ValueError('message')"
|
|
instead of the older form "raise ValueError, 'message'".
|
|
|
|
The paren-using form is preferred because when the exception arguments
|
|
are long or include string formatting, you don't need to use line
|
|
continuation characters thanks to the containing parentheses. The older
|
|
form will be removed in Python 3000.
|
|
|
|
Okay: raise DummyError("Message")
|
|
W602: raise DummyError, "Message"
|
|
"""
|
|
match = RAISE_COMMA_REGEX.match(logical_line)
|
|
if match and not RERAISE_COMMA_REGEX.match(logical_line):
|
|
yield match.start(1), "W602 deprecated form of raising exception"
|
|
|
|
|
|
def python_3000_not_equal(logical_line):
|
|
"""
|
|
!= can also be written <>, but this is an obsolete usage kept for
|
|
backwards compatibility only. New code should always use !=.
|
|
The older syntax is removed in Python 3000.
|
|
|
|
Okay: if a != 'no':
|
|
W603: if a <> 'no':
|
|
"""
|
|
pos = logical_line.find('<>')
|
|
if pos > -1:
|
|
yield pos, "W603 '<>' is deprecated, use '!='"
|
|
|
|
|
|
def python_3000_backticks(logical_line):
|
|
"""
|
|
Backticks are removed in Python 3000.
|
|
Use repr() instead.
|
|
|
|
Okay: val = repr(1 + 2)
|
|
W604: val = `1 + 2`
|
|
"""
|
|
pos = logical_line.find('`')
|
|
if pos > -1:
|
|
yield pos, "W604 backticks are deprecated, use 'repr()'"
|
|
|
|
|
|
##############################################################################
|
|
# Helper functions
|
|
##############################################################################
|
|
|
|
|
|
if '' == ''.encode():
|
|
# Python 2: implicit encoding.
|
|
def readlines(filename):
|
|
f = open(filename)
|
|
try:
|
|
return f.readlines()
|
|
finally:
|
|
f.close()
|
|
|
|
isidentifier = re.compile(r'[a-zA-Z_]\w*').match
|
|
stdin_get_value = sys.stdin.read
|
|
else:
|
|
# Python 3
|
|
def readlines(filename):
|
|
f = open(filename, 'rb')
|
|
try:
|
|
coding, lines = tokenize.detect_encoding(f.readline)
|
|
f = TextIOWrapper(f, coding, line_buffering=True)
|
|
return [l.decode(coding) for l in lines] + f.readlines()
|
|
except (LookupError, SyntaxError, UnicodeError):
|
|
f.close()
|
|
# Fall back if files are improperly declared
|
|
f = open(filename, encoding='latin-1')
|
|
return f.readlines()
|
|
finally:
|
|
f.close()
|
|
|
|
isidentifier = str.isidentifier
|
|
|
|
def stdin_get_value():
|
|
return TextIOWrapper(sys.stdin.buffer, errors='ignore').read()
|
|
readlines.__doc__ = " Read the source code."
|
|
|
|
|
|
def expand_indent(line):
|
|
r"""
|
|
Return the amount of indentation.
|
|
Tabs are expanded to the next multiple of 8.
|
|
|
|
>>> expand_indent(' ')
|
|
4
|
|
>>> expand_indent('\t')
|
|
8
|
|
>>> expand_indent(' \t')
|
|
8
|
|
>>> expand_indent(' \t')
|
|
8
|
|
>>> expand_indent(' \t')
|
|
16
|
|
"""
|
|
if '\t' not in line:
|
|
return len(line) - len(line.lstrip())
|
|
result = 0
|
|
for char in line:
|
|
if char == '\t':
|
|
result = result // 8 * 8 + 8
|
|
elif char == ' ':
|
|
result += 1
|
|
else:
|
|
break
|
|
return result
|
|
|
|
|
|
def mute_string(text):
|
|
"""
|
|
Replace contents with 'xxx' to prevent syntax matching.
|
|
|
|
>>> mute_string('"abc"')
|
|
'"xxx"'
|
|
>>> mute_string("'''abc'''")
|
|
"'''xxx'''"
|
|
>>> mute_string("r'abc'")
|
|
"r'xxx'"
|
|
"""
|
|
# String modifiers (e.g. u or r)
|
|
start = text.index(text[-1]) + 1
|
|
end = len(text) - 1
|
|
# Triple quotes
|
|
if text[-3:] in ('"""', "'''"):
|
|
start += 2
|
|
end -= 2
|
|
return text[:start] + 'x' * (end - start) + text[end:]
|
|
|
|
|
|
def parse_udiff(diff, patterns=None, parent='.'):
|
|
rv = {}
|
|
path = nrows = None
|
|
for line in diff.splitlines():
|
|
if nrows:
|
|
if line[:1] != '-':
|
|
nrows -= 1
|
|
continue
|
|
if line[:3] == '@@ ':
|
|
hunk_match = HUNK_REGEX.match(line)
|
|
row, nrows = [int(g or '1') for g in hunk_match.groups()]
|
|
rv[path].update(range(row, row + nrows))
|
|
elif line[:3] == '+++':
|
|
path = line[4:].split('\t', 1)[0]
|
|
if path[:2] == 'b/':
|
|
path = path[2:]
|
|
rv[path] = set()
|
|
return dict([(os.path.join(parent, path), rows)
|
|
for (path, rows) in rv.items()
|
|
if rows and filename_match(path, patterns)])
|
|
|
|
|
|
def filename_match(filename, patterns, default=True):
|
|
"""
|
|
Check if patterns contains a pattern that matches filename.
|
|
If patterns is unspecified, this always returns True.
|
|
"""
|
|
if not patterns:
|
|
return default
|
|
return any(fnmatch(filename, pattern) for pattern in patterns)
|
|
|
|
|
|
##############################################################################
|
|
# Framework to run all checks
|
|
##############################################################################
|
|
|
|
|
|
def find_checks(argument_name):
|
|
"""
|
|
Find all globally visible functions where the first argument name
|
|
starts with argument_name.
|
|
"""
|
|
for name, function in globals().items():
|
|
if not inspect.isfunction(function):
|
|
continue
|
|
args = inspect.getargspec(function)[0]
|
|
if args and args[0].startswith(argument_name):
|
|
codes = ERRORCODE_REGEX.findall(function.__doc__ or '')
|
|
yield name, codes, function, args
|
|
|
|
|
|
class Checker(object):
|
|
"""
|
|
Load a Python source file, tokenize it, check coding style.
|
|
"""
|
|
|
|
def __init__(self, filename, lines=None,
|
|
options=None, report=None, **kwargs):
|
|
if options is None:
|
|
options = StyleGuide(kwargs).options
|
|
else:
|
|
assert not kwargs
|
|
self._io_error = None
|
|
self._physical_checks = options.physical_checks
|
|
self._logical_checks = options.logical_checks
|
|
self.max_line_length = options.max_line_length
|
|
self.verbose = options.verbose
|
|
self.filename = filename
|
|
if filename is None:
|
|
self.filename = 'stdin'
|
|
self.lines = lines or []
|
|
elif filename == '-':
|
|
self.filename = 'stdin'
|
|
self.lines = stdin_get_value().splitlines(True)
|
|
elif lines is None:
|
|
try:
|
|
self.lines = readlines(filename)
|
|
except IOError:
|
|
exc_type, exc = sys.exc_info()[:2]
|
|
self._io_error = '%s: %s' % (exc_type.__name__, exc)
|
|
self.lines = []
|
|
else:
|
|
self.lines = lines
|
|
self.report = report or options.report
|
|
self.report_error = self.report.error
|
|
|
|
def readline(self):
|
|
"""
|
|
Get the next line from the input buffer.
|
|
"""
|
|
self.line_number += 1
|
|
if self.line_number > len(self.lines):
|
|
return ''
|
|
return self.lines[self.line_number - 1]
|
|
|
|
def readline_check_physical(self):
|
|
"""
|
|
Check and return the next physical line. This method can be
|
|
used to feed tokenize.generate_tokens.
|
|
"""
|
|
line = self.readline()
|
|
if line:
|
|
self.check_physical(line)
|
|
return line
|
|
|
|
def run_check(self, check, argument_names):
|
|
"""
|
|
Run a check plugin.
|
|
"""
|
|
arguments = []
|
|
for name in argument_names:
|
|
arguments.append(getattr(self, name))
|
|
return check(*arguments)
|
|
|
|
def check_physical(self, line):
|
|
"""
|
|
Run all physical checks on a raw input line.
|
|
"""
|
|
self.physical_line = line
|
|
if self.indent_char is None and line[:1] in WHITESPACE:
|
|
self.indent_char = line[0]
|
|
for name, check, argument_names in self._physical_checks:
|
|
result = self.run_check(check, argument_names)
|
|
if result is not None:
|
|
offset, text = result
|
|
self.report_error(self.line_number, offset, text, check)
|
|
|
|
def build_tokens_line(self):
|
|
"""
|
|
Build a logical line from tokens.
|
|
"""
|
|
self.mapping = []
|
|
logical = []
|
|
length = 0
|
|
previous = None
|
|
for token in self.tokens:
|
|
token_type, text = token[0:2]
|
|
if token_type in SKIP_TOKENS:
|
|
continue
|
|
if token_type == tokenize.STRING:
|
|
text = mute_string(text)
|
|
if previous:
|
|
end_row, end = previous[3]
|
|
start_row, start = token[2]
|
|
if end_row != start_row: # different row
|
|
prev_text = self.lines[end_row - 1][end - 1]
|
|
if prev_text == ',' or (prev_text not in '{[('
|
|
and text not in '}])'):
|
|
logical.append(' ')
|
|
length += 1
|
|
elif end != start: # different column
|
|
fill = self.lines[end_row - 1][end:start]
|
|
logical.append(fill)
|
|
length += len(fill)
|
|
self.mapping.append((length, token))
|
|
logical.append(text)
|
|
length += len(text)
|
|
previous = token
|
|
self.logical_line = ''.join(logical)
|
|
assert self.logical_line.strip() == self.logical_line
|
|
|
|
def check_logical(self):
|
|
"""
|
|
Build a line from tokens and run all logical checks on it.
|
|
"""
|
|
self.build_tokens_line()
|
|
self.report.increment_logical_line()
|
|
first_line = self.lines[self.mapping[0][1][2][0] - 1]
|
|
indent = first_line[:self.mapping[0][1][2][1]]
|
|
self.previous_indent_level = self.indent_level
|
|
self.indent_level = expand_indent(indent)
|
|
if self.verbose >= 2:
|
|
print(self.logical_line[:80].rstrip())
|
|
for name, check, argument_names in self._logical_checks:
|
|
if self.verbose >= 4:
|
|
print(' ' + name)
|
|
for result in self.run_check(check, argument_names):
|
|
offset, text = result
|
|
if isinstance(offset, tuple):
|
|
orig_number, orig_offset = offset
|
|
else:
|
|
for token_offset, token in self.mapping:
|
|
if offset >= token_offset:
|
|
orig_number = token[2][0]
|
|
orig_offset = (token[2][1] + offset - token_offset)
|
|
self.report_error(orig_number, orig_offset, text, check)
|
|
self.previous_logical = self.logical_line
|
|
|
|
def generate_tokens(self):
|
|
if self._io_error:
|
|
self.report_error(1, 0, 'E902 %s' % self._io_error, readlines)
|
|
tokengen = tokenize.generate_tokens(self.readline_check_physical)
|
|
try:
|
|
for token in tokengen:
|
|
yield token
|
|
except (SyntaxError, tokenize.TokenError):
|
|
exc_type, exc = sys.exc_info()[:2]
|
|
offset = exc.args[1]
|
|
if len(offset) > 2:
|
|
offset = offset[1:3]
|
|
self.report_error(offset[0], offset[1],
|
|
'E901 %s: %s' % (exc_type.__name__, exc.args[0]),
|
|
self.generate_tokens)
|
|
generate_tokens.__doc__ = " Check if the syntax is valid."
|
|
|
|
def check_all(self, expected=None, line_offset=0):
|
|
"""
|
|
Run all checks on the input file.
|
|
"""
|
|
self.report.init_file(self.filename, self.lines, expected, line_offset)
|
|
self.line_number = 0
|
|
self.indent_char = None
|
|
self.indent_level = 0
|
|
self.previous_logical = ''
|
|
self.tokens = []
|
|
self.blank_lines = blank_lines_before_comment = 0
|
|
parens = 0
|
|
for token in self.generate_tokens():
|
|
self.tokens.append(token)
|
|
token_type, text = token[0:2]
|
|
if self.verbose >= 3:
|
|
if token[2][0] == token[3][0]:
|
|
pos = '[%s:%s]' % (token[2][1] or '', token[3][1])
|
|
else:
|
|
pos = 'l.%s' % token[3][0]
|
|
print('l.%s\t%s\t%s\t%r' %
|
|
(token[2][0], pos, tokenize.tok_name[token[0]], text))
|
|
if token_type == tokenize.OP:
|
|
if text in '([{':
|
|
parens += 1
|
|
elif text in '}])':
|
|
parens -= 1
|
|
elif not parens:
|
|
if token_type == tokenize.NEWLINE:
|
|
if self.blank_lines < blank_lines_before_comment:
|
|
self.blank_lines = blank_lines_before_comment
|
|
self.check_logical()
|
|
self.tokens = []
|
|
self.blank_lines = blank_lines_before_comment = 0
|
|
elif token_type == tokenize.NL:
|
|
if len(self.tokens) == 1:
|
|
# The physical line contains only this token.
|
|
self.blank_lines += 1
|
|
self.tokens = []
|
|
elif token_type == tokenize.COMMENT and len(self.tokens) == 1:
|
|
if blank_lines_before_comment < self.blank_lines:
|
|
blank_lines_before_comment = self.blank_lines
|
|
self.blank_lines = 0
|
|
if COMMENT_WITH_NL:
|
|
# The comment also ends a physical line
|
|
self.tokens = []
|
|
return self.report.get_file_results()
|
|
|
|
|
|
class BaseReport(object):
|
|
"""Collect the results of the checks."""
|
|
print_filename = False
|
|
|
|
def __init__(self, options):
|
|
self._benchmark_keys = options.benchmark_keys
|
|
self._ignore_code = options.ignore_code
|
|
# Results
|
|
self.elapsed = 0
|
|
self.total_errors = 0
|
|
self.counters = dict.fromkeys(self._benchmark_keys, 0)
|
|
self.messages = {}
|
|
|
|
def start(self):
|
|
"""Start the timer."""
|
|
self._start_time = time.time()
|
|
|
|
def stop(self):
|
|
"""Stop the timer."""
|
|
self.elapsed = time.time() - self._start_time
|
|
|
|
def init_file(self, filename, lines, expected, line_offset):
|
|
"""Signal a new file."""
|
|
self.filename = filename
|
|
self.lines = lines
|
|
self.expected = expected or ()
|
|
self.line_offset = line_offset
|
|
self.file_errors = 0
|
|
self.counters['files'] += 1
|
|
self.counters['physical lines'] += len(lines)
|
|
|
|
def increment_logical_line(self):
|
|
"""Signal a new logical line."""
|
|
self.counters['logical lines'] += 1
|
|
|
|
def error(self, line_number, offset, text, check):
|
|
"""Report an error, according to options."""
|
|
code = text[:4]
|
|
if self._ignore_code(code):
|
|
return
|
|
if code in self.counters:
|
|
self.counters[code] += 1
|
|
else:
|
|
self.counters[code] = 1
|
|
self.messages[code] = text[5:]
|
|
# Don't care about expected errors or warnings
|
|
if code in self.expected:
|
|
return
|
|
if self.print_filename and not self.file_errors:
|
|
print(self.filename)
|
|
self.file_errors += 1
|
|
self.total_errors += 1
|
|
return code
|
|
|
|
def get_file_results(self):
|
|
"""Return the count of errors and warnings for this file."""
|
|
return self.file_errors
|
|
|
|
def get_count(self, prefix=''):
|
|
"""Return the total count of errors and warnings."""
|
|
return sum([self.counters[key]
|
|
for key in self.messages if key.startswith(prefix)])
|
|
|
|
def get_statistics(self, prefix=''):
|
|
"""
|
|
Get statistics for message codes that start with the prefix.
|
|
|
|
prefix='' matches all errors and warnings
|
|
prefix='E' matches all errors
|
|
prefix='W' matches all warnings
|
|
prefix='E4' matches all errors that have to do with imports
|
|
"""
|
|
return ['%-7s %s %s' % (self.counters[key], key, self.messages[key])
|
|
for key in sorted(self.messages) if key.startswith(prefix)]
|
|
|
|
def print_statistics(self, prefix=''):
|
|
"""Print overall statistics (number of errors and warnings)."""
|
|
for line in self.get_statistics(prefix):
|
|
print(line)
|
|
|
|
def print_benchmark(self):
|
|
"""Print benchmark numbers."""
|
|
print('%-7.2f %s' % (self.elapsed, 'seconds elapsed'))
|
|
if self.elapsed:
|
|
for key in self._benchmark_keys:
|
|
print('%-7d %s per second (%d total)' %
|
|
(self.counters[key] / self.elapsed, key,
|
|
self.counters[key]))
|
|
|
|
|
|
class FileReport(BaseReport):
|
|
print_filename = True
|
|
|
|
|
|
class StandardReport(BaseReport):
|
|
"""Collect and print the results of the checks."""
|
|
|
|
def __init__(self, options):
|
|
super(StandardReport, self).__init__(options)
|
|
self._fmt = REPORT_FORMAT.get(options.format.lower(),
|
|
options.format)
|
|
self._repeat = options.repeat
|
|
self._show_source = options.show_source
|
|
self._show_pep8 = options.show_pep8
|
|
|
|
def error(self, line_number, offset, text, check):
|
|
"""
|
|
Report an error, according to options.
|
|
"""
|
|
code = super(StandardReport, self).error(line_number, offset,
|
|
text, check)
|
|
if code and (self.counters[code] == 1 or self._repeat):
|
|
print(self._fmt % {
|
|
'path': self.filename,
|
|
'row': self.line_offset + line_number, 'col': offset + 1,
|
|
'code': code, 'text': text[5:],
|
|
})
|
|
if self._show_source:
|
|
if line_number > len(self.lines):
|
|
line = ''
|
|
else:
|
|
line = self.lines[line_number - 1]
|
|
print(line.rstrip())
|
|
print(' ' * offset + '^')
|
|
if self._show_pep8:
|
|
print(check.__doc__.lstrip('\n').rstrip())
|
|
return code
|
|
|
|
|
|
class DiffReport(StandardReport):
|
|
"""Collect and print the results for the changed lines only."""
|
|
|
|
def __init__(self, options):
|
|
super(DiffReport, self).__init__(options)
|
|
self._selected = options.selected_lines
|
|
|
|
def error(self, line_number, offset, text, check):
|
|
if line_number not in self._selected[self.filename]:
|
|
return
|
|
return super(DiffReport, self).error(line_number, offset, text, check)
|
|
|
|
|
|
class TestReport(StandardReport):
|
|
"""Collect the results for the tests."""
|
|
|
|
def __init__(self, options):
|
|
options.benchmark_keys += ['test cases', 'failed tests']
|
|
super(TestReport, self).__init__(options)
|
|
self._verbose = options.verbose
|
|
|
|
def get_file_results(self):
|
|
# Check if the expected errors were found
|
|
label = '%s:%s:1' % (self.filename, self.line_offset)
|
|
codes = sorted(self.expected)
|
|
for code in codes:
|
|
if not self.counters.get(code):
|
|
self.file_errors += 1
|
|
self.total_errors += 1
|
|
print('%s: error %s not found' % (label, code))
|
|
if self._verbose and not self.file_errors:
|
|
print('%s: passed (%s)' %
|
|
(label, ' '.join(codes) or 'Okay'))
|
|
self.counters['test cases'] += 1
|
|
if self.file_errors:
|
|
self.counters['failed tests'] += 1
|
|
# Reset counters
|
|
for key in set(self.counters) - set(self._benchmark_keys):
|
|
del self.counters[key]
|
|
self.messages = {}
|
|
return self.file_errors
|
|
|
|
def print_results(self):
|
|
results = ("%(physical lines)d lines tested: %(files)d files, "
|
|
"%(test cases)d test cases%%s." % self.counters)
|
|
if self.total_errors:
|
|
print(results % ", %s failures" % self.total_errors)
|
|
else:
|
|
print(results % "")
|
|
print("Test failed." if self.total_errors else "Test passed.")
|
|
|
|
|
|
class StyleGuide(object):
|
|
"""Initialize a PEP-8 instance with few options."""
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
# build options from the command line
|
|
parse_argv = kwargs.pop('parse_argv', False)
|
|
config_file = kwargs.pop('config_file', None)
|
|
options, self.paths = process_options(parse_argv=parse_argv,
|
|
config_file=config_file)
|
|
if args or kwargs:
|
|
# build options from dict
|
|
options_dict = dict(*args, **kwargs)
|
|
options.__dict__.update(options_dict)
|
|
if 'paths' in options_dict:
|
|
self.paths = options_dict['paths']
|
|
|
|
self.runner = self.input_file
|
|
self.options = options
|
|
|
|
if not options.reporter:
|
|
options.reporter = BaseReport if options.quiet else StandardReport
|
|
|
|
for index, value in enumerate(options.exclude):
|
|
options.exclude[index] = value.rstrip('/')
|
|
# Ignore all checks which are not explicitly selected
|
|
options.select = tuple(options.select or ())
|
|
options.ignore = tuple(options.ignore or options.select and ('',))
|
|
options.benchmark_keys = BENCHMARK_KEYS[:]
|
|
options.ignore_code = self.ignore_code
|
|
options.physical_checks = self.get_checks('physical_line')
|
|
options.logical_checks = self.get_checks('logical_line')
|
|
self.init_report()
|
|
|
|
def init_report(self, reporter=None):
|
|
"""Initialize the report instance."""
|
|
self.options.report = (reporter or self.options.reporter)(self.options)
|
|
return self.options.report
|
|
|
|
def check_files(self, paths=None):
|
|
"""Run all checks on the paths."""
|
|
if paths is None:
|
|
paths = self.paths
|
|
report = self.options.report
|
|
runner = self.runner
|
|
report.start()
|
|
for path in paths:
|
|
if os.path.isdir(path):
|
|
self.input_dir(path)
|
|
elif not self.excluded(path):
|
|
runner(path)
|
|
report.stop()
|
|
return report
|
|
|
|
def input_file(self, filename, lines=None, expected=None, line_offset=0):
|
|
"""Run all checks on a Python source file."""
|
|
if self.options.verbose:
|
|
print('checking %s' % filename)
|
|
fchecker = Checker(filename, lines=lines, options=self.options)
|
|
return fchecker.check_all(expected=expected, line_offset=line_offset)
|
|
|
|
def input_dir(self, dirname):
|
|
"""Check all files in this directory and all subdirectories."""
|
|
dirname = dirname.rstrip('/')
|
|
if self.excluded(dirname):
|
|
return 0
|
|
counters = self.options.report.counters
|
|
verbose = self.options.verbose
|
|
filepatterns = self.options.filename
|
|
runner = self.runner
|
|
for root, dirs, files in os.walk(dirname):
|
|
if verbose:
|
|
print('directory ' + root)
|
|
counters['directories'] += 1
|
|
for subdir in sorted(dirs):
|
|
if self.excluded(os.path.join(root, subdir)):
|
|
dirs.remove(subdir)
|
|
for filename in sorted(files):
|
|
# contain a pattern that matches?
|
|
if ((filename_match(filename, filepatterns) and
|
|
not self.excluded(filename))):
|
|
runner(os.path.join(root, filename))
|
|
|
|
def excluded(self, filename):
|
|
"""
|
|
Check if options.exclude contains a pattern that matches filename.
|
|
"""
|
|
basename = os.path.basename(filename)
|
|
return any((filename_match(filename, self.options.exclude,
|
|
default=False),
|
|
filename_match(basename, self.options.exclude,
|
|
default=False)))
|
|
|
|
def ignore_code(self, code):
|
|
"""
|
|
Check if the error code should be ignored.
|
|
|
|
If 'options.select' contains a prefix of the error code,
|
|
return False. Else, if 'options.ignore' contains a prefix of
|
|
the error code, return True.
|
|
"""
|
|
return (code.startswith(self.options.ignore) and
|
|
not code.startswith(self.options.select))
|
|
|
|
def get_checks(self, argument_name):
|
|
"""
|
|
Find all globally visible functions where the first argument name
|
|
starts with argument_name and which contain selected tests.
|
|
"""
|
|
checks = []
|
|
for name, codes, function, args in find_checks(argument_name):
|
|
if any(not (code and self.ignore_code(code)) for code in codes):
|
|
checks.append((name, function, args))
|
|
return sorted(checks)
|
|
|
|
|
|
def init_tests(pep8style):
|
|
"""
|
|
Initialize testing framework.
|
|
|
|
A test file can provide many tests. Each test starts with a
|
|
declaration. This declaration is a single line starting with '#:'.
|
|
It declares codes of expected failures, separated by spaces or 'Okay'
|
|
if no failure is expected.
|
|
If the file does not contain such declaration, it should pass all
|
|
tests. If the declaration is empty, following lines are not checked,
|
|
until next declaration.
|
|
|
|
Examples:
|
|
|
|
* Only E224 and W701 are expected: #: E224 W701
|
|
* Following example is conform: #: Okay
|
|
* Don't check these lines: #:
|
|
"""
|
|
report = pep8style.init_report(TestReport)
|
|
runner = pep8style.input_file
|
|
|
|
def run_tests(filename):
|
|
"""Run all the tests from a file."""
|
|
lines = readlines(filename) + ['#:\n']
|
|
line_offset = 0
|
|
codes = ['Okay']
|
|
testcase = []
|
|
count_files = report.counters['files']
|
|
for index, line in enumerate(lines):
|
|
if not line.startswith('#:'):
|
|
if codes:
|
|
# Collect the lines of the test case
|
|
testcase.append(line)
|
|
continue
|
|
if codes and index:
|
|
codes = [c for c in codes if c != 'Okay']
|
|
# Run the checker
|
|
runner(filename, testcase, expected=codes,
|
|
line_offset=line_offset)
|
|
# output the real line numbers
|
|
line_offset = index + 1
|
|
# configure the expected errors
|
|
codes = line.split()[1:]
|
|
# empty the test case buffer
|
|
del testcase[:]
|
|
report.counters['files'] = count_files + 1
|
|
return report.counters['failed tests']
|
|
|
|
pep8style.runner = run_tests
|
|
|
|
|
|
def selftest(options):
|
|
"""
|
|
Test all check functions with test cases in docstrings.
|
|
"""
|
|
count_failed = count_all = 0
|
|
report = BaseReport(options)
|
|
counters = report.counters
|
|
checks = options.physical_checks + options.logical_checks
|
|
for name, check, argument_names in checks:
|
|
for line in check.__doc__.splitlines():
|
|
line = line.lstrip()
|
|
match = SELFTEST_REGEX.match(line)
|
|
if match is None:
|
|
continue
|
|
code, source = match.groups()
|
|
checker = Checker(None, options=options, report=report)
|
|
for part in source.split(r'\n'):
|
|
part = part.replace(r'\t', '\t')
|
|
part = part.replace(r'\s', ' ')
|
|
checker.lines.append(part + '\n')
|
|
checker.check_all()
|
|
error = None
|
|
if code == 'Okay':
|
|
if len(counters) > len(options.benchmark_keys):
|
|
codes = [key for key in counters
|
|
if key not in options.benchmark_keys]
|
|
error = "incorrectly found %s" % ', '.join(codes)
|
|
elif not counters.get(code):
|
|
error = "failed to find %s" % code
|
|
# Keep showing errors for multiple tests
|
|
for key in set(counters) - set(options.benchmark_keys):
|
|
del counters[key]
|
|
report.messages = {}
|
|
count_all += 1
|
|
if not error:
|
|
if options.verbose:
|
|
print("%s: %s" % (code, source))
|
|
else:
|
|
count_failed += 1
|
|
print("%s: %s:" % (__file__, error))
|
|
for line in checker.lines:
|
|
print(line.rstrip())
|
|
return count_failed, count_all
|
|
|
|
|
|
def read_config(options, args, arglist, parser):
|
|
"""Read both user configuration and local configuration."""
|
|
config = RawConfigParser()
|
|
|
|
user_conf = options.config
|
|
if user_conf and os.path.isfile(user_conf):
|
|
if options.verbose:
|
|
print('user configuration: %s' % user_conf)
|
|
config.read(user_conf)
|
|
|
|
parent = tail = args and os.path.abspath(os.path.commonprefix(args))
|
|
while tail:
|
|
local_conf = os.path.join(parent, '.pep8')
|
|
if os.path.isfile(local_conf):
|
|
if options.verbose:
|
|
print('local configuration: %s' % local_conf)
|
|
config.read(local_conf)
|
|
break
|
|
parent, tail = os.path.split(parent)
|
|
|
|
if config.has_section('pep8'):
|
|
option_list = dict([(o.dest, o.type or o.action)
|
|
for o in parser.option_list])
|
|
|
|
# First, read the default values
|
|
new_options, _ = parser.parse_args([])
|
|
|
|
# Second, parse the configuration
|
|
for opt in config.options('pep8'):
|
|
if options.verbose > 1:
|
|
print(' %s = %s' % (opt, config.get('pep8', opt)))
|
|
if opt.replace('_', '-') not in parser.config_options:
|
|
print('Unknown option: \'%s\'\n not in [%s]' %
|
|
(opt, ' '.join(parser.config_options)))
|
|
sys.exit(1)
|
|
normalized_opt = opt.replace('-', '_')
|
|
opt_type = option_list[normalized_opt]
|
|
if opt_type in ('int', 'count'):
|
|
value = config.getint('pep8', opt)
|
|
elif opt_type == 'string':
|
|
value = config.get('pep8', opt)
|
|
else:
|
|
assert opt_type in ('store_true', 'store_false')
|
|
value = config.getboolean('pep8', opt)
|
|
setattr(new_options, normalized_opt, value)
|
|
|
|
# Third, overwrite with the command-line options
|
|
options, _ = parser.parse_args(arglist, values=new_options)
|
|
|
|
return options
|
|
|
|
|
|
def process_options(arglist=None, parse_argv=False, config_file=None):
|
|
"""Process options passed either via arglist or via command line args."""
|
|
if not arglist and not parse_argv:
|
|
# Don't read the command line if the module is used as a library.
|
|
arglist = []
|
|
if config_file is True:
|
|
config_file = DEFAULT_CONFIG
|
|
parser = OptionParser(version=__version__,
|
|
usage="%prog [options] input ...")
|
|
parser.config_options = [
|
|
'exclude', 'filename', 'select', 'ignore', 'max-line-length', 'count',
|
|
'format', 'quiet', 'show-pep8', 'show-source', 'statistics', 'verbose']
|
|
parser.add_option('-v', '--verbose', default=0, action='count',
|
|
help="print status messages, or debug with -vv")
|
|
parser.add_option('-q', '--quiet', default=0, action='count',
|
|
help="report only file names, or nothing with -qq")
|
|
parser.add_option('-r', '--repeat', default=True, action='store_true',
|
|
help="(obsolete) show all occurrences of the same error")
|
|
parser.add_option('--first', action='store_false', dest='repeat',
|
|
help="show first occurrence of each error")
|
|
parser.add_option('--exclude', metavar='patterns', default=DEFAULT_EXCLUDE,
|
|
help="exclude files or directories which match these "
|
|
"comma separated patterns (default: %default)")
|
|
parser.add_option('--filename', metavar='patterns', default='*.py',
|
|
help="when parsing directories, only check filenames "
|
|
"matching these comma separated patterns "
|
|
"(default: %default)")
|
|
parser.add_option('--select', metavar='errors', default='',
|
|
help="select errors and warnings (e.g. E,W6)")
|
|
parser.add_option('--ignore', metavar='errors', default='',
|
|
help="skip errors and warnings (e.g. E4,W)")
|
|
parser.add_option('--show-source', action='store_true',
|
|
help="show source code for each error")
|
|
parser.add_option('--show-pep8', action='store_true',
|
|
help="show text of PEP 8 for each error "
|
|
"(implies --first)")
|
|
parser.add_option('--statistics', action='store_true',
|
|
help="count errors and warnings")
|
|
parser.add_option('--count', action='store_true',
|
|
help="print total number of errors and warnings "
|
|
"to standard error and set exit code to 1 if "
|
|
"total is not null")
|
|
parser.add_option('--max-line-length', type='int', metavar='n',
|
|
default=MAX_LINE_LENGTH,
|
|
help="set maximum allowed line length "
|
|
"(default: %default)")
|
|
parser.add_option('--format', metavar='format', default='default',
|
|
help="set the error format [default|pylint|<custom>]")
|
|
parser.add_option('--diff', action='store_true',
|
|
help="report only lines changed according to the "
|
|
"unified diff received on STDIN")
|
|
group = parser.add_option_group("Testing Options")
|
|
group.add_option('--testsuite', metavar='dir',
|
|
help="run regression tests from dir")
|
|
group.add_option('--doctest', action='store_true',
|
|
help="run doctest on myself")
|
|
group.add_option('--benchmark', action='store_true',
|
|
help="measure processing speed")
|
|
group = parser.add_option_group("Configuration", description=(
|
|
"The project options are read from the [pep8] section of the .pep8 "
|
|
"file located in any parent folder of the path(s) being processed. "
|
|
"Allowed options are: %s." % ', '.join(parser.config_options)))
|
|
group.add_option('--config', metavar='path', default=config_file,
|
|
help="config file location (default: %default)")
|
|
|
|
options, args = parser.parse_args(arglist)
|
|
options.reporter = None
|
|
|
|
if options.testsuite:
|
|
args.append(options.testsuite)
|
|
elif not options.doctest:
|
|
if parse_argv and not args:
|
|
if os.path.exists('.pep8') or options.diff:
|
|
args = ['.']
|
|
else:
|
|
parser.error('input not specified')
|
|
options = read_config(options, args, arglist, parser)
|
|
options.reporter = parse_argv and options.quiet == 1 and FileReport
|
|
|
|
if options.filename:
|
|
options.filename = options.filename.split(',')
|
|
options.exclude = options.exclude.split(',')
|
|
if options.select:
|
|
options.select = options.select.split(',')
|
|
if options.ignore:
|
|
options.ignore = options.ignore.split(',')
|
|
elif not (options.select or
|
|
options.testsuite or options.doctest) and DEFAULT_IGNORE:
|
|
# The default choice: ignore controversial checks
|
|
# (for doctest and testsuite, all checks are required)
|
|
options.ignore = DEFAULT_IGNORE.split(',')
|
|
|
|
if options.diff:
|
|
options.reporter = DiffReport
|
|
stdin = stdin_get_value()
|
|
options.selected_lines = parse_udiff(stdin, options.filename, args[0])
|
|
args = sorted(options.selected_lines)
|
|
|
|
return options, args
|
|
|
|
|
|
def _main():
|
|
"""Parse options and run checks on Python source."""
|
|
pep8style = StyleGuide(parse_argv=True, config_file=True)
|
|
options = pep8style.options
|
|
if options.doctest:
|
|
import doctest
|
|
fail_d, done_d = doctest.testmod(report=False, verbose=options.verbose)
|
|
fail_s, done_s = selftest(options)
|
|
count_failed = fail_s + fail_d
|
|
if not options.quiet:
|
|
count_passed = done_d + done_s - count_failed
|
|
print("%d passed and %d failed." % (count_passed, count_failed))
|
|
print("Test failed." if count_failed else "Test passed.")
|
|
if count_failed:
|
|
sys.exit(1)
|
|
if options.testsuite:
|
|
init_tests(pep8style)
|
|
report = pep8style.check_files()
|
|
if options.statistics:
|
|
report.print_statistics()
|
|
if options.benchmark:
|
|
report.print_benchmark()
|
|
if options.testsuite and not options.quiet:
|
|
report.print_results()
|
|
if report.total_errors:
|
|
if options.count:
|
|
sys.stderr.write(str(report.total_errors) + '\n')
|
|
sys.exit(1)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
_main()
|