From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- tools/check-moz-style/modules/__init__.py | 1 + tools/check-moz-style/modules/cpplint.py | 3150 ++++++++++++++++++++++++++ tools/check-moz-style/modules/diff_parser.py | 180 ++ tools/check-moz-style/modules/logging.py | 39 + tools/check-moz-style/modules/scm.py | 420 ++++ 5 files changed, 3790 insertions(+) create mode 100644 tools/check-moz-style/modules/__init__.py create mode 100644 tools/check-moz-style/modules/cpplint.py create mode 100644 tools/check-moz-style/modules/diff_parser.py create mode 100644 tools/check-moz-style/modules/logging.py create mode 100644 tools/check-moz-style/modules/scm.py (limited to 'tools/check-moz-style/modules') diff --git a/tools/check-moz-style/modules/__init__.py b/tools/check-moz-style/modules/__init__.py new file mode 100644 index 000000000..ef65bee5b --- /dev/null +++ b/tools/check-moz-style/modules/__init__.py @@ -0,0 +1 @@ +# Required for Python to search this directory for module files diff --git a/tools/check-moz-style/modules/cpplint.py b/tools/check-moz-style/modules/cpplint.py new file mode 100644 index 000000000..c01e82d45 --- /dev/null +++ b/tools/check-moz-style/modules/cpplint.py @@ -0,0 +1,3150 @@ +#!/usr/bin/python +# -*- coding: utf-8 -*- +# +# Copyright (C) 2009 Google Inc. All rights reserved. +# Copyright (C) 2009 Torch Mobile Inc. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above +# copyright notice, this list of conditions and the following disclaimer +# in the documentation and/or other materials provided with the +# distribution. +# * Neither the name of Google Inc. nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +# This is the modified version of Google's cpplint. The original code is +# http://google-styleguide.googlecode.com/svn/trunk/cpplint/cpplint.py + +"""Does WebKit-lint on c++ files. + +The goal of this script is to identify places in the code that *may* +be in non-compliance with WebKit style. It does not attempt to fix +up these problems -- the point is to educate. It does also not +attempt to find all problems, or to ensure that everything it does +find is legitimately a problem. + +In particular, we can get very confused by /* and // inside strings! +We do a small hack, which is to ignore //'s with "'s after them on the +same line, but it is far from perfect (in either direction). +""" + +import codecs +import getopt +import math # for log +import os +import os.path +import re +import sre_compile +import string +import sys +import unicodedata + + +_USAGE = """ +Syntax: cpplint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...] + [file] ... + + The style guidelines this tries to follow are those in + http://webkit.org/coding/coding-style.html + + Every problem is given a confidence score from 1-5, with 5 meaning we are + certain of the problem, and 1 meaning it could be a legitimate construct. + This will miss some errors, and is not a substitute for a code review. + + To prevent specific lines from being linted, add a '// NOLINT' comment to the + end of the line. + + The files passed in will be linted; at least one file must be provided. + Linted extensions are .cpp, .c and .h. Other file types will be ignored. + + Flags: + + output=vs7 + By default, the output is formatted to ease emacs parsing. Visual Studio + compatible output (vs7) may also be used. Other formats are unsupported. + + verbose=# + Specify a number 0-5 to restrict errors to certain verbosity levels. + + filter=-x,+y,... + Specify a comma-separated list of category-filters to apply: only + error messages whose category names pass the filters will be printed. + (Category names are printed with the message and look like + "[whitespace/indent]".) Filters are evaluated left to right. + "-FOO" and "FOO" means "do not print categories that start with FOO". + "+FOO" means "do print categories that start with FOO". + + Examples: --filter=-whitespace,+whitespace/braces + --filter=whitespace,runtime/printf,+runtime/printf_format + --filter=-,+build/include_what_you_use + + To see a list of all the categories used in cpplint, pass no arg: + --filter= +""" + +# We categorize each error message we print. Here are the categories. +# We want an explicit list so we can list them all in cpplint --filter=. +# If you add a new error message with a new category, add it to the list +# here! cpplint_unittest.py should tell you if you forget to do this. +# \ used for clearer layout -- pylint: disable-msg=C6013 +_ERROR_CATEGORIES = '''\ + build/class + build/deprecated + build/endif_comment + build/forward_decl + build/header_guard + build/include + build/include_order + build/include_what_you_use + build/namespaces + build/printf_format + build/storage_class + legal/copyright + readability/braces + readability/casting + readability/check + readability/comparison_to_zero + readability/constructors + readability/control_flow + readability/fn_size + readability/function + readability/multiline_comment + readability/multiline_string + readability/null + readability/streams + readability/todo + readability/utf8 + runtime/arrays + runtime/casting + runtime/explicit + runtime/int + runtime/init + runtime/invalid_increment + runtime/memset + runtime/printf + runtime/printf_format + runtime/references + runtime/rtti + runtime/sizeof + runtime/string + runtime/threadsafe_fn + runtime/virtual + whitespace/blank_line + whitespace/braces + whitespace/comma + whitespace/comments + whitespace/comments-doublespace + whitespace/end_of_line + whitespace/ending_newline + whitespace/indent + whitespace/labels + whitespace/line_length + whitespace/newline + whitespace/operators + whitespace/parens + whitespace/semicolon + whitespace/tab + whitespace/todo +''' + +# The default state of the category filter. This is overrided by the --filter= +# flag. By default all errors are on, so only add here categories that should be +# off by default (i.e., categories that must be enabled by the --filter= flags). +# All entries here should start with a '-' or '+', as in the --filter= flag. +_DEFAULT_FILTERS = [] + +# Headers that we consider STL headers. +_STL_HEADERS = frozenset([ + 'algobase.h', 'algorithm', 'alloc.h', 'bitset', 'deque', 'exception', + 'function.h', 'functional', 'hash_map', 'hash_map.h', 'hash_set', + 'hash_set.h', 'iterator', 'list', 'list.h', 'map', 'memory', 'pair.h', + 'pthread_alloc', 'queue', 'set', 'set.h', 'sstream', 'stack', + 'stl_alloc.h', 'stl_relops.h', 'type_traits.h', + 'utility', 'vector', 'vector.h', + ]) + + +# Non-STL C++ system headers. +_CPP_HEADERS = frozenset([ + 'algo.h', 'builtinbuf.h', 'bvector.h', 'cassert', 'cctype', + 'cerrno', 'cfloat', 'ciso646', 'climits', 'clocale', 'cmath', + 'complex', 'complex.h', 'csetjmp', 'csignal', 'cstdarg', 'cstddef', + 'cstdio', 'cstdlib', 'cstring', 'ctime', 'cwchar', 'cwctype', + 'defalloc.h', 'deque.h', 'editbuf.h', 'exception', 'fstream', + 'fstream.h', 'hashtable.h', 'heap.h', 'indstream.h', 'iomanip', + 'iomanip.h', 'ios', 'iosfwd', 'iostream', 'iostream.h', 'istream.h', + 'iterator.h', 'limits', 'map.h', 'multimap.h', 'multiset.h', + 'numeric', 'ostream.h', 'parsestream.h', 'pfstream.h', 'PlotFile.h', + 'procbuf.h', 'pthread_alloc.h', 'rope', 'rope.h', 'ropeimpl.h', + 'SFile.h', 'slist', 'slist.h', 'stack.h', 'stdexcept', + 'stdiostream.h', 'streambuf.h', 'stream.h', 'strfile.h', 'string', + 'strstream', 'strstream.h', 'tempbuf.h', 'tree.h', 'typeinfo', 'valarray', + ]) + + +# Assertion macros. These are defined in base/logging.h and +# testing/base/gunit.h. Note that the _M versions need to come first +# for substring matching to work. +_CHECK_MACROS = [ + 'DCHECK', 'CHECK', + 'EXPECT_TRUE_M', 'EXPECT_TRUE', + 'ASSERT_TRUE_M', 'ASSERT_TRUE', + 'EXPECT_FALSE_M', 'EXPECT_FALSE', + 'ASSERT_FALSE_M', 'ASSERT_FALSE', + ] + +# Replacement macros for CHECK/DCHECK/EXPECT_TRUE/EXPECT_FALSE +_CHECK_REPLACEMENT = dict([(m, {}) for m in _CHECK_MACROS]) + +for op, replacement in [('==', 'EQ'), ('!=', 'NE'), + ('>=', 'GE'), ('>', 'GT'), + ('<=', 'LE'), ('<', 'LT')]: + _CHECK_REPLACEMENT['DCHECK'][op] = 'DCHECK_%s' % replacement + _CHECK_REPLACEMENT['CHECK'][op] = 'CHECK_%s' % replacement + _CHECK_REPLACEMENT['EXPECT_TRUE'][op] = 'EXPECT_%s' % replacement + _CHECK_REPLACEMENT['ASSERT_TRUE'][op] = 'ASSERT_%s' % replacement + _CHECK_REPLACEMENT['EXPECT_TRUE_M'][op] = 'EXPECT_%s_M' % replacement + _CHECK_REPLACEMENT['ASSERT_TRUE_M'][op] = 'ASSERT_%s_M' % replacement + +for op, inv_replacement in [('==', 'NE'), ('!=', 'EQ'), + ('>=', 'LT'), ('>', 'LE'), + ('<=', 'GT'), ('<', 'GE')]: + _CHECK_REPLACEMENT['EXPECT_FALSE'][op] = 'EXPECT_%s' % inv_replacement + _CHECK_REPLACEMENT['ASSERT_FALSE'][op] = 'ASSERT_%s' % inv_replacement + _CHECK_REPLACEMENT['EXPECT_FALSE_M'][op] = 'EXPECT_%s_M' % inv_replacement + _CHECK_REPLACEMENT['ASSERT_FALSE_M'][op] = 'ASSERT_%s_M' % inv_replacement + + +# These constants define types of headers for use with +# _IncludeState.check_next_include_order(). +_CONFIG_HEADER = 0 +_PRIMARY_HEADER = 1 +_OTHER_HEADER = 2 + + +_regexp_compile_cache = {} + + +def match(pattern, s): + """Matches the string with the pattern, caching the compiled regexp.""" + # The regexp compilation caching is inlined in both match and search for + # performance reasons; factoring it out into a separate function turns out + # to be noticeably expensive. + if not pattern in _regexp_compile_cache: + _regexp_compile_cache[pattern] = sre_compile.compile(pattern) + return _regexp_compile_cache[pattern].match(s) + + +def search(pattern, s): + """Searches the string for the pattern, caching the compiled regexp.""" + if not pattern in _regexp_compile_cache: + _regexp_compile_cache[pattern] = sre_compile.compile(pattern) + return _regexp_compile_cache[pattern].search(s) + + +class _IncludeState(dict): + """Tracks line numbers for includes, and the order in which includes appear. + + As a dict, an _IncludeState object serves as a mapping between include + filename and line number on which that file was included. + + Call check_next_include_order() once for each header in the file, passing + in the type constants defined above. Calls in an illegal order will + raise an _IncludeError with an appropriate error message. + + """ + # self._section will move monotonically through this set. If it ever + # needs to move backwards, check_next_include_order will raise an error. + _INITIAL_SECTION = 0 + _CONFIG_SECTION = 1 + _PRIMARY_SECTION = 2 + _OTHER_SECTION = 3 + + _TYPE_NAMES = { + _CONFIG_HEADER: 'WebCore config.h', + _PRIMARY_HEADER: 'header this file implements', + _OTHER_HEADER: 'other header', + } + _SECTION_NAMES = { + _INITIAL_SECTION: "... nothing.", + _CONFIG_SECTION: "WebCore config.h.", + _PRIMARY_SECTION: 'a header this file implements.', + _OTHER_SECTION: 'other header.', + } + + def __init__(self): + dict.__init__(self) + self._section = self._INITIAL_SECTION + self._visited_primary_section = False + self.header_types = dict(); + + def visited_primary_section(self): + return self._visited_primary_section + + def check_next_include_order(self, header_type, file_is_header): + """Returns a non-empty error message if the next header is out of order. + + This function also updates the internal state to be ready to check + the next include. + + Args: + header_type: One of the _XXX_HEADER constants defined above. + file_is_header: Whether the file that owns this _IncludeState is itself a header + + Returns: + The empty string if the header is in the right order, or an + error message describing what's wrong. + + """ + if header_type == _CONFIG_HEADER and file_is_header: + return 'Header file should not contain WebCore config.h.' + if header_type == _PRIMARY_HEADER and file_is_header: + return 'Header file should not contain itself.' + + error_message = '' + if self._section != self._OTHER_SECTION: + before_error_message = ('Found %s before %s' % + (self._TYPE_NAMES[header_type], + self._SECTION_NAMES[self._section + 1])) + after_error_message = ('Found %s after %s' % + (self._TYPE_NAMES[header_type], + self._SECTION_NAMES[self._section])) + + if header_type == _CONFIG_HEADER: + if self._section >= self._CONFIG_SECTION: + error_message = after_error_message + self._section = self._CONFIG_SECTION + elif header_type == _PRIMARY_HEADER: + if self._section >= self._PRIMARY_SECTION: + error_message = after_error_message + elif self._section < self._CONFIG_SECTION: + error_message = before_error_message + self._section = self._PRIMARY_SECTION + self._visited_primary_section = True + else: + assert header_type == _OTHER_HEADER + if not file_is_header and self._section < self._PRIMARY_SECTION: + error_message = before_error_message + self._section = self._OTHER_SECTION + + return error_message + + +class _CppLintState(object): + """Maintains module-wide state..""" + + def __init__(self): + self.verbose_level = 1 # global setting. + self.error_count = 0 # global count of reported errors + # filters to apply when emitting error messages + self.filters = _DEFAULT_FILTERS[:] + + # output format: + # "emacs" - format that emacs can parse (default) + # "vs7" - format that Microsoft Visual Studio 7 can parse + self.output_format = 'emacs' + + self.output_stream = sys.stderr + + def set_output_format(self, output_format): + """Sets the output format for errors.""" + self.output_format = output_format + + def set_verbose_level(self, level): + """Sets the module's verbosity, and returns the previous setting.""" + last_verbose_level = self.verbose_level + self.verbose_level = level + return last_verbose_level + + def set_filters(self, filters): + """Sets the error-message filters. + + These filters are applied when deciding whether to emit a given + error message. + + Args: + filters: A string of comma-separated filters (eg "+whitespace/indent"). + Each filter should start with + or -; else we die. + + Raises: + ValueError: The comma-separated filters did not all start with '+' or '-'. + E.g. "-,+whitespace,-whitespace/indent,whitespace/badfilter" + """ + # Default filters always have less priority than the flag ones. + self.filters = _DEFAULT_FILTERS[:] + for filter in filters.split(','): + clean_filter = filter.strip() + if clean_filter: + self.filters.append(clean_filter) + for filter in self.filters: + if not (filter.startswith('+') or filter.startswith('-')): + raise ValueError('Every filter in --filter must start with ' + '+ or - (%s does not)' % filter) + + def reset_error_count(self): + """Sets the module's error statistic back to zero.""" + self.error_count = 0 + + def increment_error_count(self): + """Bumps the module's error statistic.""" + self.error_count += 1 + + def set_stream(self, stream): + self.output_stream = stream + + def write_error(self, error): + self.output_stream.write(error) + + +_cpplint_state = _CppLintState() + + +def _output_format(): + """Gets the module's output format.""" + return _cpplint_state.output_format + + +def _set_output_format(output_format): + """Sets the module's output format.""" + _cpplint_state.set_output_format(output_format) + + +def _verbose_level(): + """Returns the module's verbosity setting.""" + return _cpplint_state.verbose_level + + +def _set_verbose_level(level): + """Sets the module's verbosity, and returns the previous setting.""" + return _cpplint_state.set_verbose_level(level) + + +def _filters(): + """Returns the module's list of output filters, as a list.""" + return _cpplint_state.filters + + +def _set_filters(filters): + """Sets the module's error-message filters. + + These filters are applied when deciding whether to emit a given + error message. + + Args: + filters: A string of comma-separated filters (eg "whitespace/indent"). + Each filter should start with + or -; else we die. + """ + _cpplint_state.set_filters(filters) + + +def error_count(): + """Returns the global count of reported errors.""" + return _cpplint_state.error_count + + +class _FunctionState(object): + """Tracks current function name and the number of lines in its body.""" + + _NORMAL_TRIGGER = 250 # for --v=0, 500 for --v=1, etc. + _TEST_TRIGGER = 400 # about 50% more than _NORMAL_TRIGGER. + + def __init__(self): + self.in_a_function = False + self.lines_in_function = 0 + self.current_function = '' + + def begin(self, function_name): + """Start analyzing function body. + + Args: + function_name: The name of the function being tracked. + """ + self.in_a_function = True + self.lines_in_function = 0 + self.current_function = function_name + + def count(self): + """Count line in current function body.""" + if self.in_a_function: + self.lines_in_function += 1 + + def check(self, error, filename, line_number): + """Report if too many lines in function body. + + Args: + error: The function to call with any errors found. + filename: The name of the current file. + line_number: The number of the line to check. + """ + if match(r'T(EST|est)', self.current_function): + base_trigger = self._TEST_TRIGGER + else: + base_trigger = self._NORMAL_TRIGGER + trigger = base_trigger * 2 ** _verbose_level() + + if self.lines_in_function > trigger: + error_level = int(math.log(self.lines_in_function / base_trigger, 2)) + # 50 => 0, 100 => 1, 200 => 2, 400 => 3, 800 => 4, 1600 => 5, ... + if error_level > 5: + error_level = 5 + error(filename, line_number, 'readability/fn_size', error_level, + 'Small and focused functions are preferred:' + ' %s has %d non-comment lines' + ' (error triggered by exceeding %d lines).' % ( + self.current_function, self.lines_in_function, trigger)) + + def end(self): + """Stop analizing function body.""" + self.in_a_function = False + + +class _IncludeError(Exception): + """Indicates a problem with the include order in a file.""" + pass + + +class FileInfo: + """Provides utility functions for filenames. + + FileInfo provides easy access to the components of a file's path + relative to the project root. + """ + + def __init__(self, filename): + self._filename = filename + + def full_name(self): + """Make Windows paths like Unix.""" + return os.path.abspath(self._filename).replace('\\', '/') + + def repository_name(self): + """Full name after removing the local path to the repository. + + If we have a real absolute path name here we can try to do something smart: + detecting the root of the checkout and truncating /path/to/checkout from + the name so that we get header guards that don't include things like + "C:\Documents and Settings\..." or "/home/username/..." in them and thus + people on different computers who have checked the source out to different + locations won't see bogus errors. + """ + fullname = self.full_name() + + if os.path.exists(fullname): + project_dir = os.path.dirname(fullname) + + if os.path.exists(os.path.join(project_dir, ".svn")): + # If there's a .svn file in the current directory, we + # recursively look up the directory tree for the top + # of the SVN checkout + root_dir = project_dir + one_up_dir = os.path.dirname(root_dir) + while os.path.exists(os.path.join(one_up_dir, ".svn")): + root_dir = os.path.dirname(root_dir) + one_up_dir = os.path.dirname(one_up_dir) + + prefix = os.path.commonprefix([root_dir, project_dir]) + return fullname[len(prefix) + 1:] + + # Not SVN? Try to find a git top level directory by + # searching up from the current path. + root_dir = os.path.dirname(fullname) + while (root_dir != os.path.dirname(root_dir) + and not os.path.exists(os.path.join(root_dir, ".git"))): + root_dir = os.path.dirname(root_dir) + if os.path.exists(os.path.join(root_dir, ".git")): + prefix = os.path.commonprefix([root_dir, project_dir]) + return fullname[len(prefix) + 1:] + + # Don't know what to do; header guard warnings may be wrong... + return fullname + + def split(self): + """Splits the file into the directory, basename, and extension. + + For 'chrome/browser/browser.cpp', Split() would + return ('chrome/browser', 'browser', '.cpp') + + Returns: + A tuple of (directory, basename, extension). + """ + + googlename = self.repository_name() + project, rest = os.path.split(googlename) + return (project,) + os.path.splitext(rest) + + def base_name(self): + """File base name - text after the final slash, before the final period.""" + return self.split()[1] + + def extension(self): + """File extension - text following the final period.""" + return self.split()[2] + + def no_extension(self): + """File has no source file extension.""" + return '/'.join(self.split()[0:2]) + + def is_source(self): + """File has a source file extension.""" + return self.extension()[1:] in ('c', 'cc', 'cpp', 'cxx') + + +def _should_print_error(category, confidence): + """Returns true iff confidence >= verbose, and category passes filter.""" + # There are two ways we might decide not to print an error message: + # the verbosity level isn't high enough, or the filters filter it out. + if confidence < _cpplint_state.verbose_level: + return False + + is_filtered = False + for one_filter in _filters(): + if one_filter.startswith('-'): + if category.startswith(one_filter[1:]): + is_filtered = True + elif one_filter.startswith('+'): + if category.startswith(one_filter[1:]): + is_filtered = False + else: + assert False # should have been checked for in set_filter. + if is_filtered: + return False + + return True + + +def error(filename, line_number, category, confidence, message): + """Logs the fact we've found a lint error. + + We log where the error was found, and also our confidence in the error, + that is, how certain we are this is a legitimate style regression, and + not a misidentification or a use that's sometimes justified. + + Args: + filename: The name of the file containing the error. + line_number: The number of the line containing the error. + category: A string used to describe the "category" this bug + falls under: "whitespace", say, or "runtime". Categories + may have a hierarchy separated by slashes: "whitespace/indent". + confidence: A number from 1-5 representing a confidence score for + the error, with 5 meaning that we are certain of the problem, + and 1 meaning that it could be a legitimate construct. + message: The error message. + """ + # There are two ways we might decide not to print an error message: + # the verbosity level isn't high enough, or the filters filter it out. + if _should_print_error(category, confidence): + _cpplint_state.increment_error_count() + if _cpplint_state.output_format == 'vs7': + write_error('%s(%s): %s [%s] [%d]\n' % ( + filename, line_number, message, category, confidence)) + else: + write_error('%s:%s: %s [%s] [%d]\n' % ( + filename, line_number, message, category, confidence)) + + +# Matches standard C++ escape esequences per 2.13.2.3 of the C++ standard. +_RE_PATTERN_CLEANSE_LINE_ESCAPES = re.compile( + r'\\([abfnrtv?"\\\']|\d+|x[0-9a-fA-F]+)') +# Matches strings. Escape codes should already be removed by ESCAPES. +_RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES = re.compile(r'"[^"]*"') +# Matches characters. Escape codes should already be removed by ESCAPES. +_RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES = re.compile(r"'.'") +# Matches multi-line C++ comments. +# This RE is a little bit more complicated than one might expect, because we +# have to take care of space removals tools so we can handle comments inside +# statements better. +# The current rule is: We only clear spaces from both sides when we're at the +# end of the line. Otherwise, we try to remove spaces from the right side, +# if this doesn't work we try on left side but only if there's a non-character +# on the right. +_RE_PATTERN_CLEANSE_LINE_C_COMMENTS = re.compile( + r"""(\s*/\*.*\*/\s*$| + /\*.*\*/\s+| + \s+/\*.*\*/(?=\W)| + /\*.*\*/)""", re.VERBOSE) + + +def is_cpp_string(line): + """Does line terminate so, that the next symbol is in string constant. + + This function does not consider single-line nor multi-line comments. + + Args: + line: is a partial line of code starting from the 0..n. + + Returns: + True, if next character appended to 'line' is inside a + string constant. + """ + + line = line.replace(r'\\', 'XX') # after this, \\" does not match to \" + return ((line.count('"') - line.count(r'\"') - line.count("'\"'")) & 1) == 1 + + +def find_next_multi_line_comment_start(lines, line_index): + """Find the beginning marker for a multiline comment.""" + while line_index < len(lines): + if lines[line_index].strip().startswith('/*'): + # Only return this marker if the comment goes beyond this line + if lines[line_index].strip().find('*/', 2) < 0: + return line_index + line_index += 1 + return len(lines) + + +def find_next_multi_line_comment_end(lines, line_index): + """We are inside a comment, find the end marker.""" + while line_index < len(lines): + if lines[line_index].strip().endswith('*/'): + return line_index + line_index += 1 + return len(lines) + + +def remove_multi_line_comments_from_range(lines, begin, end): + """Clears a range of lines for multi-line comments.""" + # Having // dummy comments makes the lines non-empty, so we will not get + # unnecessary blank line warnings later in the code. + for i in range(begin, end): + lines[i] = '// dummy' + + +def remove_multi_line_comments(filename, lines, error): + """Removes multiline (c-style) comments from lines.""" + line_index = 0 + while line_index < len(lines): + line_index_begin = find_next_multi_line_comment_start(lines, line_index) + if line_index_begin >= len(lines): + return + line_index_end = find_next_multi_line_comment_end(lines, line_index_begin) + if line_index_end >= len(lines): + error(filename, line_index_begin + 1, 'readability/multiline_comment', 5, + 'Could not find end of multi-line comment') + return + remove_multi_line_comments_from_range(lines, line_index_begin, line_index_end + 1) + line_index = line_index_end + 1 + + +def cleanse_comments(line): + """Removes //-comments and single-line C-style /* */ comments. + + Args: + line: A line of C++ source. + + Returns: + The line with single-line comments removed. + """ + comment_position = line.find('//') + if comment_position != -1 and not is_cpp_string(line[:comment_position]): + line = line[:comment_position] + # get rid of /* ... */ + return _RE_PATTERN_CLEANSE_LINE_C_COMMENTS.sub('', line) + + +class CleansedLines(object): + """Holds 3 copies of all lines with different preprocessing applied to them. + + 1) elided member contains lines without strings and comments, + 2) lines member contains lines without comments, and + 3) raw member contains all the lines without processing. + All these three members are of , and of the same length. + """ + + def __init__(self, lines): + self.elided = [] + self.lines = [] + self.raw_lines = lines + self._num_lines = len(lines) + for line_number in range(len(lines)): + self.lines.append(cleanse_comments(lines[line_number])) + elided = self.collapse_strings(lines[line_number]) + self.elided.append(cleanse_comments(elided)) + + def num_lines(self): + """Returns the number of lines represented.""" + return self._num_lines + + @staticmethod + def collapse_strings(elided): + """Collapses strings and chars on a line to simple "" or '' blocks. + + We nix strings first so we're not fooled by text like '"http://"' + + Args: + elided: The line being processed. + + Returns: + The line with collapsed strings. + """ + if not _RE_PATTERN_INCLUDE.match(elided): + # Remove escaped characters first to make quote/single quote collapsing + # basic. Things that look like escaped characters shouldn't occur + # outside of strings and chars. + elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub('', elided) + elided = _RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES.sub("''", elided) + elided = _RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES.sub('""', elided) + return elided + + +def close_expression(clean_lines, line_number, pos): + """If input points to ( or { or [, finds the position that closes it. + + If lines[line_number][pos] points to a '(' or '{' or '[', finds the the + line_number/pos that correspond to the closing of the expression. + + Args: + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + pos: A position on the line. + + Returns: + A tuple (line, line_number, pos) pointer *past* the closing brace, or + (line, len(lines), -1) if we never find a close. Note we ignore + strings and comments when matching; and the line we return is the + 'cleansed' line at line_number. + """ + + line = clean_lines.elided[line_number] + start_character = line[pos] + if start_character not in '({[': + return (line, clean_lines.num_lines(), -1) + if start_character == '(': + end_character = ')' + if start_character == '[': + end_character = ']' + if start_character == '{': + end_character = '}' + + num_open = line.count(start_character) - line.count(end_character) + while line_number < clean_lines.num_lines() and num_open > 0: + line_number += 1 + line = clean_lines.elided[line_number] + num_open += line.count(start_character) - line.count(end_character) + # OK, now find the end_character that actually got us back to even + endpos = len(line) + while num_open >= 0: + endpos = line.rfind(')', 0, endpos) + num_open -= 1 # chopped off another ) + return (line, line_number, endpos + 1) + + +def check_for_copyright(filename, lines, error): + """Logs an error if no Copyright message appears at the top of the file.""" + + # We'll say it should occur by line 10. Don't forget there's a + # dummy line at the front. + for line in xrange(1, min(len(lines), 11)): + if re.search(r'Copyright|License', lines[line], re.I): + break + else: # means no copyright line was found + error(filename, 1, 'legal/copyright', 3, + 'No copyright message found.') + + +def get_header_guard_cpp_variable(filename): + """Returns the CPP variable that should be used as a header guard. + + Args: + filename: The name of a C++ header file. + + Returns: + The CPP variable that should be used as a header guard in the + named file. + + """ + + fileinfo = FileInfo(filename) + return re.sub(r'[-./\s]', '_', fileinfo.repository_name()).upper() + '_' + + +def check_for_header_guard(filename, lines, error): + """Checks that the file contains a header guard. + + Logs an error if no #ifndef header guard is present. For other + headers, checks that the full pathname is used. + + Args: + filename: The name of the C++ header file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + + cppvar = get_header_guard_cpp_variable(filename) + + ifndef = None + ifndef_line_number = 0 + define = None + endif = None + endif_line_number = 0 + for line_number, line in enumerate(lines): + line_split = line.split() + if len(line_split) >= 2: + # find the first occurrence of #ifndef and #define, save arg + if not ifndef and line_split[0] == '#ifndef': + # set ifndef to the header guard presented on the #ifndef line. + ifndef = line_split[1] + ifndef_line_number = line_number + if not define and line_split[0] == '#define': + define = line_split[1] + # find the last occurrence of #endif, save entire line + if line.startswith('#endif'): + endif = line + endif_line_number = line_number + + if not ifndef or not define or ifndef != define: + error(filename, 1, 'build/header_guard', 5, + 'No #ifndef header guard found, suggested CPP variable is: %s' % + cppvar) + return + + # The guard should be PATH_FILE_H_, but we also allow PATH_FILE_H__ + # for backward compatibility. + if ifndef != cppvar: + error_level = 0 + if ifndef != cppvar + '_': + error_level = 5 + + error(filename, ifndef_line_number, 'build/header_guard', error_level, + '#ifndef header guard has wrong style, please use: %s' % cppvar) + + if endif != ('#endif // %s' % cppvar): + error_level = 0 + if endif != ('#endif // %s' % (cppvar + '_')): + error_level = 5 + + error(filename, endif_line_number, 'build/header_guard', error_level, + '#endif line should be "#endif // %s"' % cppvar) + + +def check_for_unicode_replacement_characters(filename, lines, error): + """Logs an error for each line containing Unicode replacement characters. + + These indicate that either the file contained invalid UTF-8 (likely) + or Unicode replacement characters (which it shouldn't). Note that + it's possible for this to throw off line numbering if the invalid + UTF-8 occurred adjacent to a newline. + + Args: + filename: The name of the current file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + for line_number, line in enumerate(lines): + if u'\ufffd' in line: + error(filename, line_number, 'readability/utf8', 5, + 'Line contains invalid UTF-8 (or Unicode replacement character).') + + +def check_for_new_line_at_eof(filename, lines, error): + """Logs an error if there is no newline char at the end of the file. + + Args: + filename: The name of the current file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + + # The array lines() was created by adding two newlines to the + # original file (go figure), then splitting on \n. + # To verify that the file ends in \n, we just have to make sure the + # last-but-two element of lines() exists and is empty. + if len(lines) < 3 or lines[-2]: + error(filename, len(lines) - 2, 'whitespace/ending_newline', 5, + 'Could not find a newline character at the end of the file.') + + +def check_for_multiline_comments_and_strings(filename, clean_lines, line_number, error): + """Logs an error if we see /* ... */ or "..." that extend past one line. + + /* ... */ comments are legit inside macros, for one line. + Otherwise, we prefer // comments, so it's ok to warn about the + other. Likewise, it's ok for strings to extend across multiple + lines, as long as a line continuation character (backslash) + terminates each line. Although not currently prohibited by the C++ + style guide, it's ugly and unnecessary. We don't do well with either + in this lint program, so we warn about both. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[line_number] + + # Remove all \\ (escaped backslashes) from the line. They are OK, and the + # second (escaped) slash may trigger later \" detection erroneously. + line = line.replace('\\\\', '') + + if line.count('/*') > line.count('*/'): + error(filename, line_number, 'readability/multiline_comment', 5, + 'Complex multi-line /*...*/-style comment found. ' + 'Lint may give bogus warnings. ' + 'Consider replacing these with //-style comments, ' + 'with #if 0...#endif, ' + 'or with more clearly structured multi-line comments.') + + if (line.count('"') - line.count('\\"')) % 2: + error(filename, line_number, 'readability/multiline_string', 5, + 'Multi-line string ("...") found. This lint script doesn\'t ' + 'do well with such strings, and may give bogus warnings. They\'re ' + 'ugly and unnecessary, and you should use concatenation instead".') + + +_THREADING_LIST = ( + ('asctime(', 'asctime_r('), + ('ctime(', 'ctime_r('), + ('getgrgid(', 'getgrgid_r('), + ('getgrnam(', 'getgrnam_r('), + ('getlogin(', 'getlogin_r('), + ('getpwnam(', 'getpwnam_r('), + ('getpwuid(', 'getpwuid_r('), + ('gmtime(', 'gmtime_r('), + ('localtime(', 'localtime_r('), + ('rand(', 'rand_r('), + ('readdir(', 'readdir_r('), + ('strtok(', 'strtok_r('), + ('ttyname(', 'ttyname_r('), + ) + + +def check_posix_threading(filename, clean_lines, line_number, error): + """Checks for calls to thread-unsafe functions. + + Much code has been originally written without consideration of + multi-threading. Also, engineers are relying on their old experience; + they have learned posix before threading extensions were added. These + tests guide the engineers to use thread-safe functions (when using + posix directly). + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[line_number] + for single_thread_function, multithread_safe_function in _THREADING_LIST: + index = line.find(single_thread_function) + # Comparisons made explicit for clarity -- pylint: disable-msg=C6403 + if index >= 0 and (index == 0 or (not line[index - 1].isalnum() + and line[index - 1] not in ('_', '.', '>'))): + error(filename, line_number, 'runtime/threadsafe_fn', 2, + 'Consider using ' + multithread_safe_function + + '...) instead of ' + single_thread_function + + '...) for improved thread safety.') + + +# Matches invalid increment: *count++, which moves pointer instead of +# incrementing a value. +_RE_PATTERN_INVALID_INCREMENT = re.compile( + r'^\s*\*\w+(\+\+|--);') + + +def check_invalid_increment(filename, clean_lines, line_number, error): + """Checks for invalid increment *count++. + + For example following function: + void increment_counter(int* count) { + *count++; + } + is invalid, because it effectively does count++, moving pointer, and should + be replaced with ++*count, (*count)++ or *count += 1. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[line_number] + if _RE_PATTERN_INVALID_INCREMENT.match(line): + error(filename, line_number, 'runtime/invalid_increment', 5, + 'Changing pointer instead of value (or unused value of operator*).') + + +class _ClassInfo(object): + """Stores information about a class.""" + + def __init__(self, name, line_number): + self.name = name + self.line_number = line_number + self.seen_open_brace = False + self.is_derived = False + self.virtual_method_line_number = None + self.has_virtual_destructor = False + self.brace_depth = 0 + + +class _ClassState(object): + """Holds the current state of the parse relating to class declarations. + + It maintains a stack of _ClassInfos representing the parser's guess + as to the current nesting of class declarations. The innermost class + is at the top (back) of the stack. Typically, the stack will either + be empty or have exactly one entry. + """ + + def __init__(self): + self.classinfo_stack = [] + + def check_finished(self, filename, error): + """Checks that all classes have been completely parsed. + + Call this when all lines in a file have been processed. + Args: + filename: The name of the current file. + error: The function to call with any errors found. + """ + if self.classinfo_stack: + # Note: This test can result in false positives if #ifdef constructs + # get in the way of brace matching. See the testBuildClass test in + # cpplint_unittest.py for an example of this. + error(filename, self.classinfo_stack[0].line_number, 'build/class', 5, + 'Failed to find complete declaration of class %s' % + self.classinfo_stack[0].name) + + +def check_for_non_standard_constructs(filename, clean_lines, line_number, + class_state, error): + """Logs an error if we see certain non-ANSI constructs ignored by gcc-2. + + Complain about several constructs which gcc-2 accepts, but which are + not standard C++. Warning about these in lint is one way to ease the + transition to new compilers. + - put storage class first (e.g. "static const" instead of "const static"). + - "%lld" instead of %qd" in printf-type functions. + - "%1$d" is non-standard in printf-type functions. + - "\%" is an undefined character escape sequence. + - text after #endif is not allowed. + - invalid inner-style forward declaration. + - >? and ?= and )\?=?\s*(\w+|[+-]?\d+)(\.\d*)?', line): + error(filename, line_number, 'build/deprecated', 3, + '>? and ,:]*>\s*)?(class|struct)\s+(\w+(::\w+)*)', line) + if class_decl_match: + classinfo_stack.append(_ClassInfo(class_decl_match.group(3), line_number)) + + # Everything else in this function uses the top of the stack if it's + # not empty. + if not classinfo_stack: + return + + classinfo = classinfo_stack[-1] + + # If the opening brace hasn't been seen look for it and also + # parent class declarations. + if not classinfo.seen_open_brace: + # If the line has a ';' in it, assume it's a forward declaration or + # a single-line class declaration, which we won't process. + if line.find(';') != -1: + classinfo_stack.pop() + return + classinfo.seen_open_brace = (line.find('{') != -1) + # Look for a bare ':' + if search('(^|[^:]):($|[^:])', line): + classinfo.is_derived = True + if not classinfo.seen_open_brace: + return # Everything else in this function is for after open brace + + # The class may have been declared with namespace or classname qualifiers. + # The constructor and destructor will not have those qualifiers. + base_classname = classinfo.name.split('::')[-1] + + # Look for single-argument constructors that aren't marked explicit. + # Technically a valid construct, but against style. + args = match(r'(?= 0 + and match(r' {6}\w', elided[search_position])): + search_position -= 1 + exception = (search_position >= 0 + and elided[search_position][:5] == ' :') + else: + # Search for the function arguments or an initializer list. We use a + # simple heuristic here: If the line is indented 4 spaces; and we have a + # closing paren, without the opening paren, followed by an opening brace + # or colon (for initializer lists) we assume that it is the last line of + # a function header. If we have a colon indented 4 spaces, it is an + # initializer list. + exception = (match(r' {4}\w[^\(]*\)\s*(const\s*)?(\{\s*$|:)', + previous_line) + or match(r' {4}:', previous_line)) + + if not exception: + error(filename, line_number, 'whitespace/blank_line', 2, + 'Blank line at the start of a code block. Is this needed?') + # This doesn't ignore whitespace at the end of a namespace block + # because that is too hard without pairing open/close braces; + # however, a special exception is made for namespace closing + # brackets which have a comment containing "namespace". + # + # Also, ignore blank lines at the end of a block in a long if-else + # chain, like this: + # if (condition1) { + # // Something followed by a blank line + # + # } else if (condition2) { + # // Something else + # } + if line_number + 1 < clean_lines.num_lines(): + next_line = raw[line_number + 1] + if (next_line + and match(r'\s*}', next_line) + and next_line.find('namespace') == -1 + and next_line.find('} else ') == -1): + error(filename, line_number, 'whitespace/blank_line', 3, + 'Blank line at the end of a code block. Is this needed?') + + # Next, we complain if there's a comment too near the text + comment_position = line.find('//') + if comment_position != -1: + # Check if the // may be in quotes. If so, ignore it + # Comparisons made explicit for clarity -- pylint: disable-msg=C6403 + if (line.count('"', 0, comment_position) - line.count('\\"', 0, comment_position)) % 2 == 0: # not in quotes + # Allow one space for new scopes, two spaces otherwise: + if (not match(r'^\s*{ //', line) + and ((comment_position >= 1 + and line[comment_position-1] not in string.whitespace) + or (comment_position >= 2 + and line[comment_position-2] not in string.whitespace))): + error(filename, line_number, 'whitespace/comments-doublespace', 2, + 'At least two spaces is best between code and comments') + # There should always be a space between the // and the comment + commentend = comment_position + 2 + if commentend < len(line) and not line[commentend] == ' ': + # but some lines are exceptions -- e.g. if they're big + # comment delimiters like: + # //---------------------------------------------------------- + # or they begin with multiple slashes followed by a space: + # //////// Header comment + matched = (search(r'[=/-]{4,}\s*$', line[commentend:]) + or search(r'^/+ ', line[commentend:])) + if not matched: + error(filename, line_number, 'whitespace/comments', 4, + 'Should have a space between // and comment') + + line = clean_lines.elided[line_number] # get rid of comments and strings + + # Don't try to do spacing checks for operator methods + line = re.sub(r'operator(==|!=|<|<<|<=|>=|>>|>)\(', 'operator\(', line) + + # We allow no-spaces around = within an if: "if ( (a=Foo()) == 0 )". + # Otherwise not. Note we only check for non-spaces on *both* sides; + # sometimes people put non-spaces on one side when aligning ='s among + # many lines (not that this is behavior that I approve of...) + if search(r'[\w.]=[\w.]', line) and not search(r'\b(if|while) ', line): + error(filename, line_number, 'whitespace/operators', 4, + 'Missing spaces around =') + + # FIXME: It's not ok to have spaces around binary operators like + - * / . + + # You should always have whitespace around binary operators. + # Alas, we can't test < or > because they're legitimately used sans spaces + # (a->b, vector a). The only time we can tell is a < with no >, and + # only if it's not template params list spilling into the next line. + matched = search(r'[^<>=!\s](==|!=|<=|>=)[^<>=!\s]', line) + if not matched: + # Note that while it seems that the '<[^<]*' term in the following + # regexp could be simplified to '<.*', which would indeed match + # the same class of strings, the [^<] means that searching for the + # regexp takes linear rather than quadratic time. + if not search(r'<[^<]*,\s*$', line): # template params spill + matched = search(r'[^<>=!\s](<)[^<>=!\s]([^>]|->)*$', line) + if matched: + error(filename, line_number, 'whitespace/operators', 3, + 'Missing spaces around %s' % matched.group(1)) + # We allow no-spaces around << and >> when used like this: 10<<20, but + # not otherwise (particularly, not when used as streams) + matched = search(r'[^0-9\s](<<|>>)[^0-9\s]', line) + if matched: + error(filename, line_number, 'whitespace/operators', 3, + 'Missing spaces around %s' % matched.group(1)) + + # There shouldn't be space around unary operators + matched = search(r'(!\s|~\s|[\s]--[\s;]|[\s]\+\+[\s;])', line) + if matched: + error(filename, line_number, 'whitespace/operators', 4, + 'Extra space for operator %s' % matched.group(1)) + + # A pet peeve of mine: no spaces after an if, while, switch, or for + matched = search(r' (if\(|for\(|foreach\(|while\(|switch\()', line) + if matched: + error(filename, line_number, 'whitespace/parens', 5, + 'Missing space before ( in %s' % matched.group(1)) + + # For if/for/foreach/while/switch, the left and right parens should be + # consistent about how many spaces are inside the parens, and + # there should either be zero or one spaces inside the parens. + # We don't want: "if ( foo)" or "if ( foo )". + # Exception: "for ( ; foo; bar)" and "for (foo; bar; )" are allowed. + matched = search(r'\b(if|for|foreach|while|switch)\s*\(([ ]*)(.).*[^ ]+([ ]*)\)\s*{\s*$', + line) + if matched: + if len(matched.group(2)) != len(matched.group(4)): + if not (matched.group(3) == ';' + and len(matched.group(2)) == 1 + len(matched.group(4)) + or not matched.group(2) and search(r'\bfor\s*\(.*; \)', line)): + error(filename, line_number, 'whitespace/parens', 5, + 'Mismatching spaces inside () in %s' % matched.group(1)) + if not len(matched.group(2)) in [0, 1]: + error(filename, line_number, 'whitespace/parens', 5, + 'Should have zero or one spaces inside ( and ) in %s' % + matched.group(1)) + + # You should always have a space after a comma (either as fn arg or operator) + if search(r',[^\s]', line): + error(filename, line_number, 'whitespace/comma', 3, + 'Missing space after ,') + + # Next we will look for issues with function calls. + check_spacing_for_function_call(filename, line, line_number, error) + + # Except after an opening paren, you should have spaces before your braces. + # And since you should never have braces at the beginning of a line, this is + # an easy test. + if search(r'[^ ({]{', line): + error(filename, line_number, 'whitespace/braces', 5, + 'Missing space before {') + + # Make sure '} else {' has spaces. + if search(r'}else', line): + error(filename, line_number, 'whitespace/braces', 5, + 'Missing space before else') + + # You shouldn't have spaces before your brackets, except maybe after + # 'delete []' or 'new char * []'. + if search(r'\w\s+\[', line) and not search(r'delete\s+\[', line): + error(filename, line_number, 'whitespace/braces', 5, + 'Extra space before [') + + # You shouldn't have a space before a semicolon at the end of the line. + # There's a special case for "for" since the style guide allows space before + # the semicolon there. + if search(r':\s*;\s*$', line): + error(filename, line_number, 'whitespace/semicolon', 5, + 'Semicolon defining empty statement. Use { } instead.') + elif search(r'^\s*;\s*$', line): + error(filename, line_number, 'whitespace/semicolon', 5, + 'Line contains only semicolon. If this should be an empty statement, ' + 'use { } instead.') + elif (search(r'\s+;\s*$', line) and not search(r'\bfor\b', line)): + error(filename, line_number, 'whitespace/semicolon', 5, + 'Extra space before last semicolon. If this should be an empty ' + 'statement, use { } instead.') + elif (search(r'\b(for|while)\s*\(.*\)\s*;\s*$', line) + and line.count('(') == line.count(')') + # Allow do {} while(); + and not search(r'}\s*while', line)): + error(filename, line_number, 'whitespace/semicolon', 5, + 'Semicolon defining empty statement for this loop. Use { } instead.') + + +def get_previous_non_blank_line(clean_lines, line_number): + """Return the most recent non-blank line and its line number. + + Args: + clean_lines: A CleansedLines instance containing the file contents. + line_number: The number of the line to check. + + Returns: + A tuple with two elements. The first element is the contents of the last + non-blank line before the current line, or the empty string if this is the + first non-blank line. The second is the line number of that line, or -1 + if this is the first non-blank line. + """ + + previous_line_number = line_number - 1 + while previous_line_number >= 0: + previous_line = clean_lines.elided[previous_line_number] + if not is_blank_line(previous_line): # if not a blank line... + return (previous_line, previous_line_number) + previous_line_number -= 1 + return ('', -1) + + +def check_namespace_indentation(filename, clean_lines, line_number, file_extension, error): + """Looks for indentation errors inside of namespaces. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + file_extension: The extension (dot not included) of the file. + error: The function to call with any errors found. + """ + + line = clean_lines.elided[line_number] # Get rid of comments and strings. + + namespace_match = match(r'(?P\s*)namespace\s+\S+\s*{\s*$', line) + if not namespace_match: + return + + namespace_indentation = namespace_match.group('namespace_indentation') + + is_header_file = file_extension == 'h' + is_implementation_file = not is_header_file + line_offset = 0 + + if is_header_file: + inner_indentation = namespace_indentation + ' ' * 4 + + for current_line in clean_lines.raw_lines[line_number + 1:]: + line_offset += 1 + + # Skip not only empty lines but also those with preprocessor directives. + # Goto labels don't occur in header files, so no need to check for those. + if current_line.strip() == '' or current_line.startswith('#'): + continue + + if not current_line.startswith(inner_indentation): + # If something unindented was discovered, make sure it's a closing brace. + if not current_line.startswith(namespace_indentation + '}'): + error(filename, line_number + line_offset, 'whitespace/indent', 4, + 'In a header, code inside a namespace should be indented.') + break + + if is_implementation_file: + for current_line in clean_lines.raw_lines[line_number + 1:]: + line_offset += 1 + + # Skip not only empty lines but also those with (goto) labels. + # The goto label regexp accepts spaces or the beginning of a + # comment (if anything) after the initial colon. + if current_line.strip() == '' or match(r'\w+\s*:([\s\/].*)?$', current_line): + continue + + remaining_line = current_line[len(namespace_indentation):] + if not match(r'\S', remaining_line): + error(filename, line_number + line_offset, 'whitespace/indent', 4, + 'In an implementation file, code inside a namespace should not be indented.') + + # Just check the first non-empty line in any case, because + # otherwise we would need to count opened and closed braces, + # which is obviously a lot more complicated. + break + + +def check_switch_indentation(filename, clean_lines, line_number, error): + """Looks for indentation errors inside of switch statements. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + + line = clean_lines.elided[line_number] # Get rid of comments and strings. + + switch_match = match(r'(?P\s*)switch\s*\(.+\)\s*{\s*$', line) + if not switch_match: + return + + switch_indentation = switch_match.group('switch_indentation') + inner_indentation = switch_indentation + ' ' * 4 + line_offset = 0 + encountered_nested_switch = False + + for current_line in clean_lines.elided[line_number + 1:]: + line_offset += 1 + + # Skip not only empty lines but also those with preprocessor directives. + if current_line.strip() == '' or current_line.startswith('#'): + continue + + if match(r'\s*switch\s*\(.+\)\s*{\s*$', current_line): + # Complexity alarm - another switch statement nested inside the one + # that we're currently testing. We'll need to track the extent of + # that inner switch if the upcoming label tests are still supposed + # to work correctly. Let's not do that; instead, we'll finish + # checking this line, and then leave it like that. Assuming the + # indentation is done consistently (even if incorrectly), this will + # still catch all indentation issues in practice. + encountered_nested_switch = True + + current_indentation_match = match(r'(?P\s*)(?P.*)$', current_line); + current_indentation = current_indentation_match.group('indentation') + remaining_line = current_indentation_match.group('remaining_line') + + # End the check at the end of the switch statement. + if remaining_line.startswith('}') and current_indentation == switch_indentation: + break + # Case and default branches should not be indented. The regexp also + # catches single-line cases like "default: break;" but does not trigger + # on stuff like "Document::Foo();". + elif match(r'(default|case\s+.*)\s*:([^:].*)?$', remaining_line): + if current_indentation != switch_indentation: + error(filename, line_number + line_offset, 'whitespace/indent', 4, + 'A case label should not be indented, but line up with its switch statement.') + # Don't throw an error for multiple badly indented labels, + # one should be enough to figure out the problem. + break + # We ignore goto labels at the very beginning of a line. + elif match(r'\w+\s*:\s*$', remaining_line): + continue + # It's not a goto label, so check if it's indented at least as far as + # the switch statement plus one more level of indentation. + elif not current_indentation.startswith(inner_indentation): + error(filename, line_number + line_offset, 'whitespace/indent', 4, + 'Non-label code inside switch statements should be indented.') + # Don't throw an error for multiple badly indented statements, + # one should be enough to figure out the problem. + break + + if encountered_nested_switch: + break + + +def check_braces(filename, clean_lines, line_number, error): + """Looks for misplaced braces (e.g. at the end of line). + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + + line = clean_lines.elided[line_number] # Get rid of comments and strings. + + """ + These don't match our style guideline: + https://developer.mozilla.org/en-US/docs/Developer_Guide/Coding_Style#Control_Structures + + TODO: Spin this off in a different rule and disable that rule for mozilla + rather then commenting this out + + + if match(r'\s*{\s*$', line): + # We allow an open brace to start a line in the case where someone + # is using braces for function definition or in a block to + # explicitly create a new scope, which is commonly used to control + # the lifetime of stack-allocated variables. We don't detect this + # perfectly: we just don't complain if the last non-whitespace + # character on the previous non-blank line is ';', ':', '{', '}', + # ')', or ') const' and doesn't begin with 'if|for|while|switch|else'. + # We also allow '#' for #endif and '=' for array initialization. + previous_line = get_previous_non_blank_line(clean_lines, line_number)[0] + if ((not search(r'[;:}{)=]\s*$|\)\s*const\s*$', previous_line) + or search(r'\b(if|for|foreach|while|switch|else)\b', previous_line)) + and previous_line.find('#') < 0): + error(filename, line_number, 'whitespace/braces', 4, + 'This { should be at the end of the previous line') + elif (search(r'\)\s*(const\s*)?{\s*$', line) + and line.count('(') == line.count(')') + and not search(r'\b(if|for|foreach|while|switch)\b', line)): + error(filename, line_number, 'whitespace/braces', 4, + 'Place brace on its own line for function definitions.') + + if (match(r'\s*}\s*$', line) and line_number > 1): + # We check if a closed brace has started a line to see if a + # one line control statement was previous. + previous_line = clean_lines.elided[line_number - 2] + if (previous_line.find('{') > 0 + and search(r'\b(if|for|foreach|while|else)\b', previous_line)): + error(filename, line_number, 'whitespace/braces', 4, + 'One line control clauses should not use braces.') + """ + + # An else clause should be on the same line as the preceding closing brace. + if match(r'\s*else\s*', line): + previous_line = get_previous_non_blank_line(clean_lines, line_number)[0] + if match(r'\s*}\s*$', previous_line): + error(filename, line_number, 'whitespace/newline', 4, + 'An else should appear on the same line as the preceding }') + + # Likewise, an else should never have the else clause on the same line + if search(r'\belse [^\s{]', line) and not search(r'\belse if\b', line): + error(filename, line_number, 'whitespace/newline', 4, + 'Else clause should never be on same line as else (use 2 lines)') + + # In the same way, a do/while should never be on one line + if match(r'\s*do [^\s{]', line): + error(filename, line_number, 'whitespace/newline', 4, + 'do/while clauses should not be on a single line') + + # Braces shouldn't be followed by a ; unless they're defining a struct + # or initializing an array. + # We can't tell in general, but we can for some common cases. + previous_line_number = line_number + while True: + (previous_line, previous_line_number) = get_previous_non_blank_line(clean_lines, previous_line_number) + if match(r'\s+{.*}\s*;', line) and not previous_line.count(';'): + line = previous_line + line + else: + break + if (search(r'{.*}\s*;', line) + and line.count('{') == line.count('}') + and not search(r'struct|class|enum|\s*=\s*{', line)): + error(filename, line_number, 'readability/braces', 4, + "You don't need a ; after a }") + + +def check_exit_statement_simplifications(filename, clean_lines, line_number, error): + """Looks for else or else-if statements that should be written as an + if statement when the prior if concludes with a return, break, continue or + goto statement. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + + line = clean_lines.elided[line_number] # Get rid of comments and strings. + + else_match = match(r'(?P\s*)(\}\s*)?else(\s+if\s*\(|(?P\s*(\{\s*)?\Z))', line) + if not else_match: + return + + else_indentation = else_match.group('else_indentation') + inner_indentation = else_indentation + ' ' * 4 + + previous_lines = clean_lines.elided[:line_number] + previous_lines.reverse() + line_offset = 0 + encountered_exit_statement = False + + for current_line in previous_lines: + line_offset -= 1 + + # Skip not only empty lines but also those with preprocessor directives + # and goto labels. + if current_line.strip() == '' or current_line.startswith('#') or match(r'\w+\s*:\s*$', current_line): + continue + + # Skip lines with closing braces on the original indentation level. + # Even though the styleguide says they should be on the same line as + # the "else if" statement, we also want to check for instances where + # the current code does not comply with the coding style. Thus, ignore + # these lines and proceed to the line before that. + if current_line == else_indentation + '}': + continue + + current_indentation_match = match(r'(?P\s*)(?P.*)$', current_line); + current_indentation = current_indentation_match.group('indentation') + remaining_line = current_indentation_match.group('remaining_line') + + # As we're going up the lines, the first real statement to encounter + # has to be an exit statement (return, break, continue or goto) - + # otherwise, this check doesn't apply. + if not encountered_exit_statement: + # We only want to find exit statements if they are on exactly + # the same level of indentation as expected from the code inside + # the block. If the indentation doesn't strictly match then we + # might have a nested if or something, which must be ignored. + if current_indentation != inner_indentation: + break + if match(r'(return(\W+.*)|(break|continue)\s*;|goto\s*\w+;)$', remaining_line): + encountered_exit_statement = True + continue + break + + # When code execution reaches this point, we've found an exit statement + # as last statement of the previous block. Now we only need to make + # sure that the block belongs to an "if", then we can throw an error. + + # Skip lines with opening braces on the original indentation level, + # similar to the closing braces check above. ("if (condition)\n{") + if current_line == else_indentation + '{': + continue + + # Skip everything that's further indented than our "else" or "else if". + if current_indentation.startswith(else_indentation) and current_indentation != else_indentation: + continue + + # So we've got a line with same (or less) indentation. Is it an "if"? + # If yes: throw an error. If no: don't throw an error. + # Whatever the outcome, this is the end of our loop. + if match(r'if\s*\(', remaining_line): + if else_match.start('else') != -1: + error(filename, line_number + line_offset, 'readability/control_flow', 4, + 'An else statement can be removed when the prior "if" ' + 'concludes with a return, break, continue or goto statement.') + else: + error(filename, line_number + line_offset, 'readability/control_flow', 4, + 'An else if statement should be written as an if statement ' + 'when the prior "if" concludes with a return, break, ' + 'continue or goto statement.') + break + + +def replaceable_check(operator, macro, line): + """Determine whether a basic CHECK can be replaced with a more specific one. + + For example suggest using CHECK_EQ instead of CHECK(a == b) and + similarly for CHECK_GE, CHECK_GT, CHECK_LE, CHECK_LT, CHECK_NE. + + Args: + operator: The C++ operator used in the CHECK. + macro: The CHECK or EXPECT macro being called. + line: The current source line. + + Returns: + True if the CHECK can be replaced with a more specific one. + """ + + # This matches decimal and hex integers, strings, and chars (in that order). + match_constant = r'([-+]?(\d+|0[xX][0-9a-fA-F]+)[lLuU]{0,3}|".*"|\'.*\')' + + # Expression to match two sides of the operator with something that + # looks like a literal, since CHECK(x == iterator) won't compile. + # This means we can't catch all the cases where a more specific + # CHECK is possible, but it's less annoying than dealing with + # extraneous warnings. + match_this = (r'\s*' + macro + r'\((\s*' + + match_constant + r'\s*' + operator + r'[^<>].*|' + r'.*[^<>]' + operator + r'\s*' + match_constant + + r'\s*\))') + + # Don't complain about CHECK(x == NULL) or similar because + # CHECK_EQ(x, NULL) won't compile (requires a cast). + # Also, don't complain about more complex boolean expressions + # involving && or || such as CHECK(a == b || c == d). + return match(match_this, line) and not search(r'NULL|&&|\|\|', line) + + +def check_check(filename, clean_lines, line_number, error): + """Checks the use of CHECK and EXPECT macros. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + error: The function to call with any errors found. + """ + + # Decide the set of replacement macros that should be suggested + raw_lines = clean_lines.raw_lines + current_macro = '' + for macro in _CHECK_MACROS: + if raw_lines[line_number].find(macro) >= 0: + current_macro = macro + break + if not current_macro: + # Don't waste time here if line doesn't contain 'CHECK' or 'EXPECT' + return + + line = clean_lines.elided[line_number] # get rid of comments and strings + + # Encourage replacing plain CHECKs with CHECK_EQ/CHECK_NE/etc. + for operator in ['==', '!=', '>=', '>', '<=', '<']: + if replaceable_check(operator, current_macro, line): + error(filename, line_number, 'readability/check', 2, + 'Consider using %s instead of %s(a %s b)' % ( + _CHECK_REPLACEMENT[current_macro][operator], + current_macro, operator)) + break + + +def check_for_comparisons_to_zero(filename, clean_lines, line_number, error): + # Get the line without comments and strings. + line = clean_lines.elided[line_number] + + # Include NULL here so that users don't have to convert NULL to 0 first and then get this error. + if search(r'[=!]=\s*(NULL|0|true|false)\W', line) or search(r'\W(NULL|0|true|false)\s*[=!]=', line): + error(filename, line_number, 'readability/comparison_to_zero', 5, + 'Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons.') + + +def check_for_null(filename, clean_lines, line_number, error): + # This check doesn't apply to C or Objective-C implementation files. + if filename.endswith('.c') or filename.endswith('.m'): + return + + line = clean_lines.elided[line_number] + if search(r'\bNULL\b', line): + error(filename, line_number, 'readability/null', 5, 'Use 0 instead of NULL.') + return + + line = clean_lines.raw_lines[line_number] + # See if NULL occurs in any comments in the line. If the search for NULL using the raw line + # matches, then do the check with strings collapsed to avoid giving errors for + # NULLs occurring in strings. + if search(r'\bNULL\b', line) and search(r'\bNULL\b', CleansedLines.collapse_strings(line)): + error(filename, line_number, 'readability/null', 4, 'Use 0 instead of NULL.') + +def get_line_width(line): + """Determines the width of the line in column positions. + + Args: + line: A string, which may be a Unicode string. + + Returns: + The width of the line in column positions, accounting for Unicode + combining characters and wide characters. + """ + if isinstance(line, unicode): + width = 0 + for c in unicodedata.normalize('NFC', line): + if unicodedata.east_asian_width(c) in ('W', 'F'): + width += 2 + elif not unicodedata.combining(c): + width += 1 + return width + return len(line) + + +def check_style(filename, clean_lines, line_number, file_extension, error): + """Checks rules from the 'C++ style rules' section of cppguide.html. + + Most of these rules are hard to test (naming, comment style), but we + do what we can. In particular we check for 4-space indents, line lengths, + tab usage, spaces inside code, etc. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + line_number: The number of the line to check. + file_extension: The extension (without the dot) of the filename. + error: The function to call with any errors found. + """ + + raw_lines = clean_lines.raw_lines + line = raw_lines[line_number] + + if line.find('\t') != -1: + error(filename, line_number, 'whitespace/tab', 1, + 'Tab found; better to use spaces') + + # One or three blank spaces at the beginning of the line is weird; it's + # hard to reconcile that with 4-space indents. + # NOTE: here are the conditions rob pike used for his tests. Mine aren't + # as sophisticated, but it may be worth becoming so: RLENGTH==initial_spaces + # if(RLENGTH > 20) complain = 0; + # if(match($0, " +(error|private|public|protected):")) complain = 0; + # if(match(prev, "&& *$")) complain = 0; + # if(match(prev, "\\|\\| *$")) complain = 0; + # if(match(prev, "[\",=><] *$")) complain = 0; + # if(match($0, " <<")) complain = 0; + # if(match(prev, " +for \\(")) complain = 0; + # if(prevodd && match(prevprev, " +for \\(")) complain = 0; + initial_spaces = 0 + cleansed_line = clean_lines.elided[line_number] + while initial_spaces < len(line) and line[initial_spaces] == ' ': + initial_spaces += 1 + if line and line[-1].isspace(): + error(filename, line_number, 'whitespace/end_of_line', 4, + 'Line ends in whitespace. Consider deleting these extra spaces.') + # There are certain situations we allow one space, notably for labels + elif ((initial_spaces == 1 or initial_spaces == 3) + and not match(r'\s*\w+\s*:\s*$', cleansed_line)): + error(filename, line_number, 'whitespace/indent', 3, + 'Weird number of spaces at line-start. ' + 'Are you using at least 2-space indent?') + # Labels should always be indented at least one space. + elif not initial_spaces and line[:2] != '//': + label_match = match(r'(?P