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Diffstat (limited to 'misc/pep8.py')
| -rw-r--r-- | misc/pep8.py | 1884 |
1 files changed, 1451 insertions, 433 deletions
diff --git a/misc/pep8.py b/misc/pep8.py index 38906294..f99ae3a3 100644 --- a/misc/pep8.py +++ b/misc/pep8.py @@ -1,6 +1,7 @@ -#!/usr/bin/python +#!/usr/bin/env python # pep8.py - Check Python source code formatting, according to PEP 8 -# Copyright (C) 2006 Johann C. Rocholl <johann@browsershots.org> +# Copyright (C) 2006-2009 Johann C. Rocholl <johann@rocholl.net> +# Copyright (C) 2009-2013 Florent Xicluna <florent.xicluna@gmail.com> # # Permission is hereby granted, free of charge, to any person # obtaining a copy of this software and associated documentation files @@ -22,7 +23,7 @@ # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. -""" +r""" Check Python source code formatting, according to PEP 8: http://www.python.org/dev/peps/pep-0008/ @@ -30,8 +31,7 @@ For usage and a list of options, try this: $ python pep8.py -h This program and its regression test suite live here: -http://svn.browsershots.org/trunk/devtools/pep8/ -http://trac.browsershots.org/browser/trunk/devtools/pep8/ +http://github.com/jcrocholl/pep8 Groups of errors and warnings: E errors @@ -43,72 +43,72 @@ W warnings 500 line length 600 deprecation 700 statements - -You can add checks to this program by writing plugins. Each plugin is -a simple function that is called for each line of source code, either -physical or logical. - -Physical line: -- Raw line of text from the input file. - -Logical line: -- Multi-line statements converted to a single line. -- Stripped left and right. -- Contents of strings replaced with 'xxx' of same length. -- Comments removed. - -The check function requests physical or logical lines by the name of -the first argument: - -def maximum_line_length(physical_line) -def extraneous_whitespace(logical_line) -def blank_lines(logical_line, blank_lines, indent_level, line_number) - -The last example above demonstrates how check plugins can request -additional information with extra arguments. All attributes of the -Checker object are available. Some examples: - -lines: a list of the raw lines from the input file -tokens: the tokens that contribute to this logical line -line_number: line number in the input file -blank_lines: blank lines before this one -indent_char: first indentation character in this file (' ' or '\t') -indent_level: indentation (with tabs expanded to multiples of 8) -previous_indent_level: indentation on previous line -previous_logical: previous logical line - -The docstring of each check function shall be the relevant part of -text from PEP 8. It is printed if the user enables --show-pep8. - +900 syntax error """ +__version__ = '1.4.5' import os import sys import re import time import inspect +import keyword import tokenize from optparse import OptionParser -from keyword import iskeyword from fnmatch import fnmatch - -__version__ = '0.2.0' -__revision__ = '$Rev$' - -default_exclude = '.svn,CVS,*.pyc,*.pyo' - -indent_match = re.compile(r'([ \t]*)').match -raise_comma_match = re.compile(r'raise\s+\w+\s*(,)').match - -operators = """ -+ - * / % ^ & | = < > >> << -+= -= *= /= %= ^= &= |= == <= >= >>= <<= -!= <> : -in is or not and -""".split() - -options = None -args = None +try: + from configparser import RawConfigParser + from io import TextIOWrapper +except ImportError: + from ConfigParser import RawConfigParser + +DEFAULT_EXCLUDE = '.svn,CVS,.bzr,.hg,.git,__pycache__' +DEFAULT_IGNORE = 'E226,E24' +if sys.platform == 'win32': + DEFAULT_CONFIG = os.path.expanduser(r'~\.pep8') +else: + DEFAULT_CONFIG = os.path.join(os.getenv('XDG_CONFIG_HOME') or + os.path.expanduser('~/.config'), 'pep8') +PROJECT_CONFIG = ('.pep8', 'tox.ini', 'setup.cfg') +TESTSUITE_PATH = os.path.join(os.path.dirname(__file__), 'testsuite') +MAX_LINE_LENGTH = 79 +REPORT_FORMAT = { + 'default': '%(path)s:%(row)d:%(col)d: %(code)s %(text)s', + 'pylint': '%(path)s:%(row)d: [%(code)s] %(text)s', +} + +PyCF_ONLY_AST = 1024 +SINGLETONS = frozenset(['False', 'None', 'True']) +KEYWORDS = frozenset(keyword.kwlist + ['print']) - SINGLETONS +UNARY_OPERATORS = frozenset(['>>', '**', '*', '+', '-']) +ARITHMETIC_OP = frozenset(['**', '*', '/', '//', '+', '-']) +WS_OPTIONAL_OPERATORS = ARITHMETIC_OP.union(['^', '&', '|', '<<', '>>', '%']) +WS_NEEDED_OPERATORS = frozenset([ + '**=', '*=', '/=', '//=', '+=', '-=', '!=', '<>', '<', '>', + '%=', '^=', '&=', '|=', '==', '<=', '>=', '<<=', '>>=', '=']) +WHITESPACE = frozenset(' \t') +SKIP_TOKENS = frozenset([tokenize.COMMENT, tokenize.NL, tokenize.NEWLINE, + tokenize.INDENT, tokenize.DEDENT]) +BENCHMARK_KEYS = ['directories', 'files', 'logical lines', 'physical lines'] + +INDENT_REGEX = re.compile(r'([ \t]*)') +RAISE_COMMA_REGEX = re.compile(r'raise\s+\w+\s*,') +RERAISE_COMMA_REGEX = re.compile(r'raise\s+\w+\s*,\s*\w+\s*,\s*\w+') +ERRORCODE_REGEX = re.compile(r'\b[A-Z]\d{3}\b') +DOCSTRING_REGEX = re.compile(r'u?r?["\']') +EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]') +WHITESPACE_AFTER_COMMA_REGEX = re.compile(r'[,;:]\s*(?: |\t)') +COMPARE_SINGLETON_REGEX = re.compile(r'([=!]=)\s*(None|False|True)') +COMPARE_TYPE_REGEX = re.compile(r'(?:[=!]=|is(?:\s+not)?)\s*type(?:s.\w+Type' + r'|\s*\(\s*([^)]*[^ )])\s*\))') +KEYWORD_REGEX = re.compile(r'(\s*)\b(?:%s)\b(\s*)' % r'|'.join(KEYWORDS)) +OPERATOR_REGEX = re.compile(r'(?:[^,\s])(\s*)(?:[-+*/|!<=>%&^]+)(\s*)') +LAMBDA_REGEX = re.compile(r'\blambda\b') +HUNK_REGEX = re.compile(r'^@@ -\d+(?:,\d+)? \+(\d+)(?:,(\d+))? @@.*$') + +# Work around Python < 2.6 behaviour, which does not generate NL after +# a comment which is on a line by itself. +COMMENT_WITH_NL = tokenize.generate_tokens(['#\n'].pop).send(None)[1] == '#\n' ############################################################################## @@ -117,7 +117,7 @@ args = None def tabs_or_spaces(physical_line, indent_char): - """ + r""" Never mix tabs and spaces. The most popular way of indenting Python is with spaces only. The @@ -126,52 +126,81 @@ def tabs_or_spaces(physical_line, indent_char): invoking the Python command line interpreter with the -t option, it issues warnings about code that illegally mixes tabs and spaces. When using -tt these warnings become errors. These options are highly recommended! + + Okay: if a == 0:\n a = 1\n b = 1 + E101: if a == 0:\n a = 1\n\tb = 1 """ - indent = indent_match(physical_line).group(1) + indent = INDENT_REGEX.match(physical_line).group(1) for offset, char in enumerate(indent): if char != indent_char: return offset, "E101 indentation contains mixed spaces and tabs" def tabs_obsolete(physical_line): - """ + r""" For new projects, spaces-only are strongly recommended over tabs. Most editors have features that make this easy to do. + + Okay: if True:\n return + W191: if True:\n\treturn """ - indent = indent_match(physical_line).group(1) - if indent.count('\t'): + indent = INDENT_REGEX.match(physical_line).group(1) + if '\t' in indent: return indent.index('\t'), "W191 indentation contains tabs" def trailing_whitespace(physical_line): - """ + r""" JCR: Trailing whitespace is superfluous. + FBM: Except when it occurs as part of a blank line (i.e. the line is + nothing but whitespace). According to Python docs[1] a line with only + whitespace is considered a blank line, and is to be ignored. However, + matching a blank line to its indentation level avoids mistakenly + terminating a multi-line statement (e.g. class declaration) when + pasting code into the standard Python interpreter. + + [1] http://docs.python.org/reference/lexical_analysis.html#blank-lines + + The warning returned varies on whether the line itself is blank, for easier + filtering for those who want to indent their blank lines. + + Okay: spam(1)\n# + W291: spam(1) \n# + W293: class Foo(object):\n \n bang = 12 """ - physical_line = physical_line.rstrip('\n') # chr(10), newline - physical_line = physical_line.rstrip('\r') # chr(13), carriage return - physical_line = physical_line.rstrip('\x0c') # chr(12), form feed, ^L - stripped = physical_line.rstrip() + physical_line = physical_line.rstrip('\n') # chr(10), newline + physical_line = physical_line.rstrip('\r') # chr(13), carriage return + physical_line = physical_line.rstrip('\x0c') # chr(12), form feed, ^L + stripped = physical_line.rstrip(' \t\v') if physical_line != stripped: - return len(stripped), "W291 trailing whitespace" + if stripped: + return len(stripped), "W291 trailing whitespace" + else: + return 0, "W293 blank line contains whitespace" def trailing_blank_lines(physical_line, lines, line_number): - """ + r""" JCR: Trailing blank lines are superfluous. + + Okay: spam(1) + W391: spam(1)\n """ - if physical_line.strip() == '' and line_number == len(lines): + if not physical_line.rstrip() and line_number == len(lines): return 0, "W391 blank line at end of file" def missing_newline(physical_line): """ JCR: The last line should have a newline. + + Reports warning W292. """ if physical_line.rstrip() == physical_line: return len(physical_line), "W292 no newline at end of file" -def maximum_line_length(physical_line): +def maximum_line_length(physical_line, max_line_length): """ Limit all lines to a maximum of 79 characters. @@ -181,10 +210,23 @@ def maximum_line_length(physical_line): ugly. Therefore, please limit all lines to a maximum of 79 characters. For flowing long blocks of text (docstrings or comments), limiting the length to 72 characters is recommended. + + Reports error E501. """ - length = len(physical_line.rstrip()) - if length > 99: - return 79, "E501 line too long (%d characters)" % length + line = physical_line.rstrip() + length = len(line) + if length > max_line_length: + if noqa(line): + return + if hasattr(line, 'decode'): # Python 2 + # The line could contain multi-byte characters + try: + length = len(line.decode('utf-8')) + except UnicodeError: + pass + if length > max_line_length: + return (max_line_length, "E501 line too long " + "(%d > %d characters)" % (length, max_line_length)) ############################################################################## @@ -192,6 +234,44 @@ def maximum_line_length(physical_line): ############################################################################## +def blank_lines(logical_line, blank_lines, indent_level, line_number, + previous_logical, previous_indent_level): + r""" + Separate top-level function and class definitions with two blank lines. + + Method definitions inside a class are separated by a single blank line. + + Extra blank lines may be used (sparingly) to separate groups of related + functions. Blank lines may be omitted between a bunch of related + one-liners (e.g. a set of dummy implementations). + + Use blank lines in functions, sparingly, to indicate logical sections. + + Okay: def a():\n pass\n\n\ndef b():\n pass + Okay: def a():\n pass\n\n\n# Foo\n# Bar\n\ndef b():\n pass + + E301: class Foo:\n b = 0\n def bar():\n pass + E302: def a():\n pass\n\ndef b(n):\n pass + E303: def a():\n pass\n\n\n\ndef b(n):\n pass + E303: def a():\n\n\n\n pass + E304: @decorator\n\ndef a():\n pass + """ + if line_number < 3 and not previous_logical: + return # Don't expect blank lines before the first line + if previous_logical.startswith('@'): + if blank_lines: + yield 0, "E304 blank lines found after function decorator" + elif blank_lines > 2 or (indent_level and blank_lines == 2): + yield 0, "E303 too many blank lines (%d)" % blank_lines + elif logical_line.startswith(('def ', 'class ', '@')): + if indent_level: + if not (blank_lines or previous_indent_level < indent_level or + DOCSTRING_REGEX.match(previous_logical)): + yield 0, "E301 expected 1 blank line, found 0" + elif blank_lines != 2: + yield 0, "E302 expected 2 blank lines, found %d" % blank_lines + + def extraneous_whitespace(logical_line): """ Avoid extraneous whitespace in the following situations: @@ -199,51 +279,273 @@ def extraneous_whitespace(logical_line): - Immediately inside parentheses, brackets or braces. - Immediately before a comma, semicolon, or colon. + + Okay: spam(ham[1], {eggs: 2}) + E201: spam( ham[1], {eggs: 2}) + E201: spam(ham[ 1], {eggs: 2}) + E201: spam(ham[1], { eggs: 2}) + E202: spam(ham[1], {eggs: 2} ) + E202: spam(ham[1 ], {eggs: 2}) + E202: spam(ham[1], {eggs: 2 }) + + E203: if x == 4: print x, y; x, y = y , x + E203: if x == 4: print x, y ; x, y = y, x + E203: if x == 4 : print x, y; x, y = y, x """ line = logical_line - for char in '([{': - found = line.find(char + ' ') - if found > -1: - return found + 1, "E201 whitespace after '%s'" % char - for char in '}])': - found = line.find(' ' + char) - if found > -1 and line[found - 1] != ',': - return found, "E202 whitespace before '%s'" % char - for char in ',;:': - found = line.find(' ' + char) - if found > -1: - return found, "E203 whitespace before '%s'" % char + for match in EXTRANEOUS_WHITESPACE_REGEX.finditer(line): + text = match.group() + char = text.strip() + found = match.start() + if text == char + ' ': + # assert char in '([{' + yield found + 1, "E201 whitespace after '%s'" % char + elif line[found - 1] != ',': + code = ('E202' if char in '}])' else 'E203') # if char in ',;:' + yield found, "%s whitespace before '%s'" % (code, char) + + +def whitespace_around_keywords(logical_line): + r""" + Avoid extraneous whitespace around keywords. + + Okay: True and False + E271: True and False + E272: True and False + E273: True and\tFalse + E274: True\tand False + """ + for match in KEYWORD_REGEX.finditer(logical_line): + before, after = match.groups() + + if '\t' in before: + yield match.start(1), "E274 tab before keyword" + elif len(before) > 1: + yield match.start(1), "E272 multiple spaces before keyword" + + if '\t' in after: + yield match.start(2), "E273 tab after keyword" + elif len(after) > 1: + yield match.start(2), "E271 multiple spaces after keyword" def missing_whitespace(logical_line): """ JCR: Each comma, semicolon or colon should be followed by whitespace. + + Okay: [a, b] + Okay: (3,) + Okay: a[1:4] + Okay: a[:4] + Okay: a[1:] + Okay: a[1:4:2] + E231: ['a','b'] + E231: foo(bar,baz) + E231: [{'a':'b'}] """ line = logical_line for index in range(len(line) - 1): char = line[index] - if char in ',;:' and line[index + 1] != ' ': + if char in ',;:' and line[index + 1] not in WHITESPACE: before = line[:index] - if char == ':' and before.count('[') > before.count(']'): - continue # Slice syntax, no space required - return index, "E231 missing whitespace after '%s'" % char + if char == ':' and before.count('[') > before.count(']') and \ + before.rfind('{') < before.rfind('['): + continue # Slice syntax, no space required + if char == ',' and line[index + 1] == ')': + continue # Allow tuple with only one element: (3,) + yield index, "E231 missing whitespace after '%s'" % char def indentation(logical_line, previous_logical, indent_char, indent_level, previous_indent_level): - """ + r""" Use 4 spaces per indentation level. For really old code that you don't want to mess up, you can continue to use 8-space tabs. + + Okay: a = 1 + Okay: if a == 0:\n a = 1 + E111: a = 1 + + Okay: for item in items:\n pass + E112: for item in items:\npass + + Okay: a = 1\nb = 2 + E113: a = 1\n b = 2 """ if indent_char == ' ' and indent_level % 4: - return 0, "E111 indentation is not a multiple of four" + yield 0, "E111 indentation is not a multiple of four" indent_expect = previous_logical.endswith(':') if indent_expect and indent_level <= previous_indent_level: - return 0, "E112 expected an indented block" + yield 0, "E112 expected an indented block" if indent_level > previous_indent_level and not indent_expect: - return 0, "E113 unexpected indentation" + yield 0, "E113 unexpected indentation" + + +def continuation_line_indentation(logical_line, tokens, indent_level, verbose): + r""" + Continuation lines should align wrapped elements either vertically using + Python's implicit line joining inside parentheses, brackets and braces, or + using a hanging indent. + + When using a hanging indent the following considerations should be applied: + + - there should be no arguments on the first line, and + + - further indentation should be used to clearly distinguish itself as a + continuation line. + + Okay: a = (\n) + E123: a = (\n ) + + Okay: a = (\n 42) + E121: a = (\n 42) + E122: a = (\n42) + E123: a = (\n 42\n ) + E124: a = (24,\n 42\n) + E125: if (a or\n b):\n pass + E126: a = (\n 42) + E127: a = (24,\n 42) + E128: a = (24,\n 42) + """ + first_row = tokens[0][2][0] + nrows = 1 + tokens[-1][2][0] - first_row + if nrows == 1 or noqa(tokens[0][4]): + return + + # 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_chances = {} + last_indent = tokens[0][2] + indent = [last_indent[1]] + 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] = expand_indent(line) - 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 + # special case for the "if" statement because len("if (") == 4 + elif not indent_chances and not row and not depth and text == 'if': + indent_chances[end[1] + 1] = True + + # 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): @@ -255,6 +557,13 @@ def whitespace_before_parameters(logical_line, tokens): - 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] @@ -264,97 +573,391 @@ def whitespace_before_parameters(logical_line, tokens): if (token_type == tokenize.OP and text in '([' and start != prev_end and - prev_type == tokenize.NAME 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 - (not iskeyword(prev_text))): - return prev_end, "E211 whitespace before '%s'" % text + # 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 """ - line = logical_line - for operator in operators: - found = line.find(' ' + operator) - if found > -1: - return found, "E221 multiple spaces before operator" - found = line.find(operator + ' ') - if found > -1: - return found, "E222 multiple spaces after operator" - found = line.find('\t' + operator) - if found > -1: - return found, "E223 tab before operator" - found = line.find(operator + '\t') - if found > -1: - return found, "E224 tab after operator" + 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: alpha[:-i] + + E225: i=i+1 + E225: submitted +=1 + E225: x = x /2 - 1 + E225: z = x **y + E226: c = (a+b) * (a-b) + E226: hypot2 = x*x + y*y + E227: c = a|b + E228: msg = fmt%(errno, errmsg) + """ + 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 3 + continue + if text in ('(', 'lambda'): + parens += 1 + elif text == ')': + parens -= 1 + if need_space: + if start != prev_end: + # Found a (probably) needed space + if need_space is not True and not need_space[1]: + yield (need_space[0], + "E225 missing whitespace around operator") + 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: + if need_space is True or need_space[1]: + # A needed trailing space was not found + yield prev_end, "E225 missing whitespace around operator" + else: + code, optype = 'E226', 'arithmetic' + if prev_text == '%': + code, optype = 'E228', 'modulo' + elif prev_text not in ARITHMETIC_OP: + code, optype = 'E227', 'bitwise or shift' + yield (need_space[0], "%s missing whitespace " + "around %s operator" % (code, optype)) + 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 WS_NEEDED_OPERATORS: + need_space = True + elif text in UNARY_OPERATORS: + # Check if the operator is being used as a binary operator + # Allow unary operators: -123, -x, +1. + # Allow argument unpacking: foo(*args, **kwargs). + if prev_type == tokenize.OP: + binary_usage = (prev_text in '}])') + elif prev_type == tokenize.NAME: + binary_usage = (prev_text not in KEYWORDS) + else: + binary_usage = (prev_type not in SKIP_TOKENS) + + if binary_usage: + need_space = None + elif text in WS_OPTIONAL_OPERATORS: + need_space = None + + if need_space is None: + # Surrounding space is optional, but ensure that + # trailing space matches opening space + need_space = (prev_end, start != prev_end) + elif need_space and start == prev_end: + # A needed opening space was not found + 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. - JCR: This should also be applied around comma etc. + Note: these checks are disabled by default + + Okay: a = (1, 2) + E241: a = (1, 2) + E242: a = (1,\t2) """ line = logical_line - for separator in ',;:': - found = line.find(separator + ' ') - if found > -1: - return found + 1, "E241 multiple spaces after '%s'" % separator - found = line.find(separator + '\t') - if found > -1: - return found + 1, "E242 tab after '%s'" % separator + 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 imports_on_separate_lines(logical_line): +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 + message = "E251 unexpected spaces around keyword / parameter equals" + for token_type, text, start, end, line in tokens: + if no_space: + no_space = False + if start != prev_end: + yield (prev_end, message) + 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, message) + 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") + symbol, sp, comment = text.partition(' ') + if symbol not in ('#', '#:') or comment[:1].isspace(): + 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 found > -1: - return found, "E401 multiple imports on one line" + 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() + E703: do_four(); # useless semicolon """ line = logical_line + last_char = len(line) - 1 found = line.find(':') - if -1 < found < len(line) - 1: + if -1 < found < last_char: before = line[:found] - if (before.count('{') <= before.count('}') and # {'a': 1} (dict) - before.count('[') <= before.count(']') and # [1:2] (slice) - not re.search(r'\blambda\b', before)): # lambda x: x - return found, "E701 multiple statements on one line (colon)" + 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: - return found, "E702 multiple statements on one line (semicolon)" + if found < last_char: + yield found, "E702 multiple statements on one line (semicolon)" + else: + yield found, "E703 statement ends with a semicolon" -def python_3000_has_key(logical_line): +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): """ - The {}.has_key() method will be removed in the future version of - Python. Use the 'in' operation instead, like: - d = {"a": 1, "b": 2} - if "b" in d: - print d["b"] + 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(1) + if inst and isidentifier(inst) and inst not in SINGLETONS: + return # Allow comparison for types which are not obvious + yield match.start(), "E721 do not compare types, use 'isinstance()'" + + +def python_3000_has_key(logical_line): + r""" + The {}.has_key() method is removed in the Python 3. + 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: - return pos, "W601 .has_key() is deprecated, use 'in'" + yield pos, "W601 .has_key() is deprecated, use 'in'" def python_3000_raise_comma(logical_line): @@ -365,11 +968,41 @@ def python_3000_raise_comma(logical_line): 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. + form is removed in Python 3. + + Okay: raise DummyError("Message") + W602: raise DummyError, "Message" """ - match = raise_comma_match(logical_line) - if match: - return match.start(1), "W602 deprecated form of raising exception" + match = RAISE_COMMA_REGEX.match(logical_line) + if match and not RERAISE_COMMA_REGEX.match(logical_line): + yield match.end() - 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 3. + + 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 3. + 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()'" ############################################################################## @@ -377,26 +1010,63 @@ def python_3000_raise_comma(logical_line): ############################################################################## +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." +noqa = re.compile(r'# no(?:qa|pep8)\b', re.I).search + + 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') + >>> expand_indent('\t') 8 - >>> expand_indent(' \\t') + >>> expand_indent(' \t') 8 - >>> expand_indent(' \\t') + >>> expand_indent(' \t') 8 - >>> expand_indent(' \\t') + >>> 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 + result = result // 8 * 8 + 8 elif char == ' ': result += 1 else: @@ -404,34 +1074,6 @@ def expand_indent(line): return result -############################################################################## -# Framework to run all checks -############################################################################## - - -def message(text): - """Print a message.""" - # print >> sys.stderr, options.prog + ': ' + text - # print >> sys.stderr, text - print text - - -def find_checks(argument_name): - """ - Find all globally visible functions where the first argument name - starts with argument_name. - """ - checks = [] - function_type = type(find_checks) - for name, function in globals().iteritems(): - if type(function) is function_type: - args = inspect.getargspec(function)[0] - if len(args) >= 1 and args[0].startswith(argument_name): - checks.append((name, function, args)) - checks.sort() - return checks - - def mute_string(text): """ Replace contents with 'xxx' to prevent syntax matching. @@ -443,32 +1085,135 @@ def mute_string(text): >>> mute_string("r'abc'") "r'xxx'" """ - start = 1 - end = len(text) - 1 # String modifiers (e.g. u or r) - if text.endswith('"'): - start += text.index('"') - elif text.endswith("'"): - start += text.index("'") + start = text.index(text[-1]) + 1 + end = len(text) - 1 # Triple quotes - if text.endswith('"""') or text.endswith("'''"): + if text[-3:] in ('"""', "'''"): start += 2 end -= 2 return text[:start] + 'x' * (end - start) + text[end:] -class Checker: +def parse_udiff(diff, patterns=None, parent='.'): + """Return a dictionary of matching lines.""" + # For each file of the diff, the entry key is the filename, + # and the value is a set of row numbers to consider. + 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 +############################################################################## + + +_checks = {'physical_line': {}, 'logical_line': {}, 'tree': {}} + + +def register_check(check, codes=None): + """ + Register a new check object. + """ + def _add_check(check, kind, codes, args): + if check in _checks[kind]: + _checks[kind][check][0].extend(codes or []) + else: + _checks[kind][check] = (codes or [''], args) + if inspect.isfunction(check): + args = inspect.getargspec(check)[0] + if args and args[0] in ('physical_line', 'logical_line'): + if codes is None: + codes = ERRORCODE_REGEX.findall(check.__doc__ or '') + _add_check(check, args[0], codes, args) + elif inspect.isclass(check): + if inspect.getargspec(check.__init__)[0][:2] == ['self', 'tree']: + _add_check(check, 'tree', codes, None) + + +def init_checks_registry(): + """ + Register all globally visible functions where the first argument name + is 'physical_line' or 'logical_line'. + """ + mod = inspect.getmodule(register_check) + for (name, function) in inspect.getmembers(mod, inspect.isfunction): + register_check(function) +init_checks_registry() + + +class Checker(object): """ Load a Python source file, tokenize it, check coding style. """ - def __init__(self, filename): + def __init__(self, filename=None, 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._ast_checks = options.ast_checks + self.max_line_length = options.max_line_length + self.verbose = options.verbose self.filename = filename - self.lines = file(filename).readlines() - self.physical_checks = find_checks('physical_line') - self.logical_checks = find_checks('logical_line') - options.counters['physical lines'] = \ - options.counters.get('physical lines', 0) + len(self.lines) + 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 report_invalid_syntax(self): + 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] or 0, + 'E901 %s: %s' % (exc_type.__name__, exc.args[0]), + self.report_invalid_syntax) + report_invalid_syntax.__doc__ = " Check if the syntax is valid." def readline(self): """ @@ -503,9 +1248,9 @@ class Checker: Run all physical checks on a raw input line. """ self.physical_line = line - if self.indent_char is None and len(line) and line[0] in ' \t': + 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: + for name, check, argument_names in self._physical_checks: result = self.run_check(check, argument_names) if result is not None: offset, text = result @@ -521,21 +1266,21 @@ class Checker: previous = None for token in self.tokens: token_type, text = token[0:2] - if token_type in (tokenize.COMMENT, tokenize.NL, - tokenize.INDENT, tokenize.DEDENT, - tokenize.NEWLINE): + if token_type in SKIP_TOKENS: continue if token_type == tokenize.STRING: text = mute_string(text) if previous: - end_line, end = previous[3] - start_line, start = token[2] - if end_line != start_line: # different row - if self.lines[end_line - 1][end - 1] not in '{[(': + 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_line - 1][end:start] + elif end != start: # different column + fill = self.lines[end_row - 1][end:start] logical.append(fill) length += len(fill) self.mapping.append((length, token)) @@ -543,300 +1288,573 @@ class Checker: length += len(text) previous = token self.logical_line = ''.join(logical) - assert self.logical_line.lstrip() == self.logical_line - assert self.logical_line.rstrip() == self.logical_line + # With Python 2, if the line ends with '\r\r\n' the assertion fails + # assert self.logical_line.strip() == self.logical_line def check_logical(self): """ Build a line from tokens and run all logical checks on it. """ - options.counters['logical lines'] = \ - options.counters.get('logical lines', 0) + 1 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 options.verbose >= 2: - print self.logical_line[:80].rstrip() - for name, check, argument_names in self.logical_checks: - if options.verbose >= 3: - print ' ', name - result = self.run_check(check, argument_names) - if result is not None: + 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 type(offset) is tuple: - original_number, original_offset = offset + if isinstance(offset, tuple): + orig_number, orig_offset = offset else: for token_offset, token in self.mapping: if offset >= token_offset: - original_number = token[2][0] - original_offset = (token[2][1] - + offset - token_offset) - self.report_error(original_number, original_offset, - text, check) + 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 check_all(self): + def check_ast(self): + try: + tree = compile(''.join(self.lines), '', 'exec', PyCF_ONLY_AST) + except SyntaxError: + return self.report_invalid_syntax() + for name, cls, _ in self._ast_checks: + checker = cls(tree, self.filename) + for lineno, offset, text, check in checker.run(): + if not noqa(self.lines[lineno - 1]): + self.report_error(lineno, offset, text, check) + + 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): + self.report_invalid_syntax() + + def check_all(self, expected=None, line_offset=0): """ Run all checks on the input file. """ - self.file_errors = 0 + self.report.init_file(self.filename, self.lines, expected, line_offset) + if self._ast_checks: + self.check_ast() self.line_number = 0 self.indent_char = None self.indent_level = 0 self.previous_logical = '' - self.blank_lines = 0 self.tokens = [] + self.blank_lines = blank_lines_before_comment = 0 parens = 0 - for token in tokenize.generate_tokens(self.readline_check_physical): - # print tokenize.tok_name[token[0]], repr(token) + for token in self.generate_tokens(): self.tokens.append(token) token_type, text = token[0:2] - if token_type == tokenize.OP and text in '([{': - parens += 1 - if token_type == tokenize.OP and text in '}])': - parens -= 1 - if token_type == tokenize.NEWLINE and not parens: - self.check_logical() - self.blank_lines = 0 - self.tokens = [] - if token_type == tokenize.NL and not parens: - self.blank_lines += 1 - self.tokens = [] - if token_type == tokenize.COMMENT: - source_line = token[4] - token_start = token[2][1] - if source_line[:token_start].strip() == '': + 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 - return self.file_errors + 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 report_error(self, line_number, offset, text, check): - """ - Report an error, according to options. - """ - if options.quiet == 1 and not self.file_errors: - message(self.filename) - self.file_errors += 1 + 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] - options.counters[code] = options.counters.get(code, 0) + 1 - options.messages[code] = text[5:] - if options.quiet: + if self._ignore_code(code): return - if options.testsuite: - base = os.path.basename(self.filename)[:4] - if base == code: - return - if base[0] == 'E' and code[0] == 'W': - return - if ignore_code(code): + 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 options.counters[code] == 1 or options.repeat: - message("%s:%s:%d: %s" % - (self.filename, line_number, offset + 1, text)) - if options.show_source: - line = self.lines[line_number - 1] - message(line.rstrip()) - message(' ' * offset + '^') - if options.show_pep8: - message(check.__doc__.lstrip('\n').rstrip()) - - -def input_file(filename): - """ - Run all checks on a Python source file. - """ - if excluded(filename) or not filename_match(filename): - return 0 - if options.verbose: - message('checking ' + filename) - options.counters['files'] = options.counters.get('files', 0) + 1 - errors = Checker(filename).check_all() - if options.testsuite and not errors: - message("%s: %s" % (filename, "no errors found")) - return errors - - -def input_dir(dirname): - """ - Check all Python source files in this directory and all subdirectories. - """ - dirname = dirname.rstrip('/') - if excluded(dirname): - return 0 - errors = 0 - for root, dirs, files in os.walk(dirname): - if options.verbose: - message('directory ' + root) - options.counters['directories'] = \ - options.counters.get('directories', 0) + 1 - dirs.sort() - for subdir in dirs: - if excluded(subdir): - dirs.remove(subdir) - files.sort() - for filename in files: - errors += input_file(os.path.join(root, filename)) - return errors - - -def excluded(filename): - """ - Check if options.exclude contains a pattern that matches filename. - """ - basename = os.path.basename(filename) - for pattern in options.exclude: - if fnmatch(basename, pattern): - # print basename, 'excluded because it matches', pattern - return True - - -def filename_match(filename): - """ - Check if options.filename contains a pattern that matches filename. - If options.filename is unspecified, this always returns True. - """ - if not options.filename: - return True - for pattern in options.filename: - if fnmatch(filename, pattern): - return True - - -def ignore_code(code): - """ - Check if options.ignore contains a prefix of the error code. - """ - for ignore in options.ignore: - if code.startswith(ignore): - return True - - -def get_error_statistics(): - """Get error statistics.""" - return get_statistics("E") + 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_warning_statistics(): - """Get warning statistics.""" - return get_statistics("W") + 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. -def get_statistics(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): + """Collect the results of the checks and print only the filenames.""" + 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 init_file(self, filename, lines, expected, line_offset): + """Signal a new file.""" + self._deferred_print = [] + return super(StandardReport, self).init_file( + filename, lines, expected, line_offset) + + 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): + self._deferred_print.append( + (line_number, offset, code, text[5:], check.__doc__)) + return code + + def get_file_results(self): + """Print the result and return the overall count for this file.""" + self._deferred_print.sort() + for line_number, offset, code, text, doc in self._deferred_print: + print(self._fmt % { + 'path': self.filename, + 'row': self.line_offset + line_number, 'col': offset + 1, + 'code': code, 'text': text, + }) + 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 and doc: + print(doc.lstrip('\n').rstrip()) + return self.file_errors - 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 - """ - stats = [] - keys = options.messages.keys() - keys.sort() - for key in keys: - if key.startswith(prefix): - stats.append('%-7s %s %s' % - (options.counters[key], key, options.messages[key])) - return stats +class DiffReport(StandardReport): + """Collect and print the results for the changed lines only.""" -def print_statistics(prefix=''): - """Print overall statistics (number of errors and warnings).""" - for line in get_statistics(prefix): - print line + 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 StyleGuide(object): + """Initialize a PEP-8 instance with few options.""" + + def __init__(self, *args, **kwargs): + # build options from the command line + self.checker_class = kwargs.pop('checker_class', Checker) + parse_argv = kwargs.pop('parse_argv', False) + config_file = kwargs.pop('config_file', None) + parser = kwargs.pop('parser', None) + options, self.paths = process_options( + parse_argv=parse_argv, config_file=config_file, parser=parser) + 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('/') + options.select = tuple(options.select or ()) + if not (options.select or options.ignore or + options.testsuite or options.doctest) and DEFAULT_IGNORE: + # The default choice: ignore controversial checks + options.ignore = tuple(DEFAULT_IGNORE.split(',')) + else: + # Ignore all checks which are not explicitly selected + 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') + options.ast_checks = self.get_checks('tree') + 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() + try: + for path in paths: + if os.path.isdir(path): + self.input_dir(path) + elif not self.excluded(path): + runner(path) + except KeyboardInterrupt: + print('... stopped') + 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 = self.checker_class( + 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 print_benchmark(elapsed): - """ - Print benchmark numbers. - """ - print '%-7.2f %s' % (elapsed, 'seconds elapsed') - keys = ['directories', 'files', - 'logical lines', 'physical lines'] - for key in keys: - if key in options.counters: - print '%-7d %s per second (%d total)' % ( - options.counters[key] / elapsed, key, - options.counters[key]) + 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 process_options(arglist=None): - """ - Process options passed either via arglist or via command line args. - """ - global options, args - usage = "%prog [options] input ..." - parser = OptionParser(usage) + 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 check, attrs in _checks[argument_name].items(): + (codes, args) = attrs + if any(not (code and self.ignore_code(code)) for code in codes): + checks.append((check.__name__, check, args)) + return sorted(checks) + + +def get_parser(prog='pep8', version=__version__): + parser = OptionParser(prog=prog, 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('--exclude', metavar='patterns', default=default_exclude, - help="skip matches (default %s)" % default_exclude) - parser.add_option('--filename', metavar='patterns', - help="only check matching files (e.g. *.py)") + 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('--repeat', action='store_true', - help="show all occurrences of the same error") 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") + 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('--benchmark', action='store_true', - help="measure processing speed") - parser.add_option('--testsuite', metavar='dir', - help="run regression tests from dir") - parser.add_option('--doctest', action='store_true', - help="run doctest on myself") + 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") + if os.path.exists(TESTSUITE_PATH): + 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") + return parser + + +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: + for name in PROJECT_CONFIG: + local_conf = os.path.join(parent, name) + if os.path.isfile(local_conf): + break + else: + parent, tail = os.path.split(parent) + continue + if options.verbose: + print('local configuration: %s' % local_conf) + config.read(local_conf) + break + + pep8_section = parser.prog + if config.has_section(pep8_section): + 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_section): + if options.verbose > 1: + print(" %s = %s" % (opt, config.get(pep8_section, 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_section, opt) + elif opt_type == 'string': + value = config.get(pep8_section, opt) + else: + assert opt_type in ('store_true', 'store_false') + value = config.getboolean(pep8_section, opt) + setattr(new_options, normalized_opt, value) + + # Third, overwrite with the command-line options + options, _ = parser.parse_args(arglist, values=new_options) + options.doctest = options.testsuite = False + return options + + +def process_options(arglist=None, parse_argv=False, config_file=None, + parser=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 not parser: + parser = get_parser() + if not parser.has_option('--config'): + if config_file is True: + config_file = DEFAULT_CONFIG + group = parser.add_option_group("Configuration", description=( + "The project options are read from the [%s] section of the " + "tox.ini file or the setup.cfg file located in any parent folder " + "of the path(s) being processed. Allowed options are: %s." % + (parser.prog, ', '.join(parser.config_options)))) + group.add_option('--config', metavar='path', default=config_file, + help="user config file location (default: %default)") options, args = parser.parse_args(arglist) - if options.testsuite: + options.reporter = None + + if options.ensure_value('testsuite', False): args.append(options.testsuite) - if len(args) == 0: - parser.error('input not specified') - options.prog = os.path.basename(sys.argv[0]) - options.exclude = options.exclude.split(',') - for index in range(len(options.exclude)): - options.exclude[index] = options.exclude[index].rstrip('/') + elif not options.ensure_value('doctest', False): + if parse_argv and not args: + if options.diff or any(os.path.exists(name) + for name in PROJECT_CONFIG): + 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(',') - else: - options.ignore = [] - options.counters = {} - options.messages = {} + + 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. - """ - options, args = process_options() - if options.doctest: - import doctest - return doctest.testmod() - start_time = time.time() - errors = 0 - for path in args: - # skip emacs backups - if path.startswith(".#"): - continue - if os.path.isdir(path): - errors += input_dir(path) - else: - errors += input_file(path) - elapsed = time.time() - start_time + """Parse options and run checks on Python source.""" + pep8style = StyleGuide(parse_argv=True, config_file=True) + options = pep8style.options + if options.doctest or options.testsuite: + from testsuite.support import run_tests + report = run_tests(pep8style) + else: + report = pep8style.check_files() if options.statistics: - print_statistics() + report.print_statistics() if options.benchmark: - print_benchmark(elapsed) - return errors > 0 + 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__': - sys.exit(_main()) + _main() |