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3361 lines
131 KiB
3361 lines
131 KiB
#!/usr/bin/python
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#
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# Copyright (c) 2009 Google Inc. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# Here are some issues that I've had people identify in my code during reviews,
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# that I think are possible to flag automatically in a lint tool. If these were
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# caught by lint, it would save time both for myself and that of my reviewers.
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# Most likely, some of these are beyond the scope of the current lint framework,
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# but I think it is valuable to retain these wish-list items even if they cannot
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# be immediately implemented.
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#
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# Suggestions
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# -----------
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# - Check for no 'explicit' for multi-arg ctor
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# - Check for boolean assign RHS in parens
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# - Check for ctor initializer-list colon position and spacing
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# - Check that if there's a ctor, there should be a dtor
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# - Check accessors that return non-pointer member variables are
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# declared const
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# - Check accessors that return non-const pointer member vars are
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# *not* declared const
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# - Check for using public includes for testing
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# - Check for spaces between brackets in one-line inline method
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# - Check for no assert()
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# - Check for spaces surrounding operators
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# - Check for 0 in pointer context (should be NULL)
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# - Check for 0 in char context (should be '\0')
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# - Check for camel-case method name conventions for methods
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# that are not simple inline getters and setters
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# - Check that base classes have virtual destructors
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# put " // namespace" after } that closes a namespace, with
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# namespace's name after 'namespace' if it is named.
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# - Do not indent namespace contents
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# - Avoid inlining non-trivial constructors in header files
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# include base/basictypes.h if DISALLOW_EVIL_CONSTRUCTORS is used
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# - Check for old-school (void) cast for call-sites of functions
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# ignored return value
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# - Check gUnit usage of anonymous namespace
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# - Check for class declaration order (typedefs, consts, enums,
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# ctor(s?), dtor, friend declarations, methods, member vars)
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#
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"""Does google-lint on c++ files.
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The goal of this script is to identify places in the code that *may*
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be in non-compliance with google style. It does not attempt to fix
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up these problems -- the point is to educate. It does also not
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attempt to find all problems, or to ensure that everything it does
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find is legitimately a problem.
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In particular, we can get very confused by /* and // inside strings!
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We do a small hack, which is to ignore //'s with "'s after them on the
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same line, but it is far from perfect (in either direction).
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"""
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import codecs
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import getopt
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import math # for log
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import os
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import re
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import sre_compile
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import string
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import sys
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import unicodedata
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_USAGE = """
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Syntax: cpplint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...]
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[--counting=total|toplevel|detailed]
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<file> [file] ...
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The style guidelines this tries to follow are those in
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http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml
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Every problem is given a confidence score from 1-5, with 5 meaning we are
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certain of the problem, and 1 meaning it could be a legitimate construct.
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This will miss some errors, and is not a substitute for a code review.
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To suppress false-positive errors of a certain category, add a
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'NOLINT(category)' comment to the line. NOLINT or NOLINT(*)
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suppresses errors of all categories on that line.
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The files passed in will be linted; at least one file must be provided.
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Linted extensions are .cc, .cpp, and .h. Other file types will be ignored.
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Flags:
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output=vs7
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By default, the output is formatted to ease emacs parsing. Visual Studio
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compatible output (vs7) may also be used. Other formats are unsupported.
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verbose=#
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Specify a number 0-5 to restrict errors to certain verbosity levels.
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filter=-x,+y,...
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Specify a comma-separated list of category-filters to apply: only
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error messages whose category names pass the filters will be printed.
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(Category names are printed with the message and look like
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"[whitespace/indent]".) Filters are evaluated left to right.
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"-FOO" and "FOO" means "do not print categories that start with FOO".
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"+FOO" means "do print categories that start with FOO".
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Examples: --filter=-whitespace,+whitespace/braces
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--filter=whitespace,runtime/printf,+runtime/printf_format
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--filter=-,+build/include_what_you_use
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To see a list of all the categories used in cpplint, pass no arg:
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--filter=
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counting=total|toplevel|detailed
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The total number of errors found is always printed. If
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'toplevel' is provided, then the count of errors in each of
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the top-level categories like 'build' and 'whitespace' will
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also be printed. If 'detailed' is provided, then a count
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is provided for each category like 'build/class'.
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"""
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# We categorize each error message we print. Here are the categories.
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# We want an explicit list so we can list them all in cpplint --filter=.
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# If you add a new error message with a new category, add it to the list
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# here! cpplint_unittest.py should tell you if you forget to do this.
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# \ used for clearer layout -- pylint: disable-msg=C6013
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_ERROR_CATEGORIES = [
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'build/class',
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'build/deprecated',
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'build/endif_comment',
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'build/explicit_make_pair',
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'build/forward_decl',
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'build/header_guard',
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'build/include',
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'build/include_alpha',
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'build/include_order',
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'build/include_what_you_use',
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'build/namespaces',
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'build/printf_format',
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'build/storage_class',
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'legal/copyright',
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'readability/braces',
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'readability/casting',
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'readability/check',
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'readability/constructors',
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'readability/fn_size',
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'readability/function',
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'readability/multiline_comment',
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'readability/multiline_string',
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'readability/nolint',
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'readability/streams',
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'readability/todo',
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'readability/utf8',
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'runtime/arrays',
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'runtime/casting',
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'runtime/explicit',
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'runtime/int',
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'runtime/init',
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'runtime/invalid_increment',
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'runtime/member_string_references',
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'runtime/memset',
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'runtime/operator',
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'runtime/printf',
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'runtime/printf_format',
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'runtime/references',
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'runtime/rtti',
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'runtime/sizeof',
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'runtime/string',
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'runtime/threadsafe_fn',
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'runtime/virtual',
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'whitespace/blank_line',
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'whitespace/braces',
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'whitespace/comma',
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'whitespace/comments',
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'whitespace/end_of_line',
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'whitespace/ending_newline',
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'whitespace/indent',
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'whitespace/labels',
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'whitespace/line_length',
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'whitespace/newline',
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'whitespace/operators',
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'whitespace/parens',
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'whitespace/semicolon',
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'whitespace/tab',
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'whitespace/todo'
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]
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# The default state of the category filter. This is overrided by the --filter=
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# flag. By default all errors are on, so only add here categories that should be
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# off by default (i.e., categories that must be enabled by the --filter= flags).
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# All entries here should start with a '-' or '+', as in the --filter= flag.
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_DEFAULT_FILTERS = ['-build/include_alpha']
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# We used to check for high-bit characters, but after much discussion we
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# decided those were OK, as long as they were in UTF-8 and didn't represent
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# hard-coded international strings, which belong in a separate i18n file.
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# Headers that we consider STL headers.
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_STL_HEADERS = frozenset([
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'algobase.h', 'algorithm', 'alloc.h', 'bitset', 'deque', 'exception',
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'function.h', 'functional', 'hash_map', 'hash_map.h', 'hash_set',
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'hash_set.h', 'iterator', 'list', 'list.h', 'map', 'memory', 'new',
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'pair.h', 'pthread_alloc', 'queue', 'set', 'set.h', 'sstream', 'stack',
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'stl_alloc.h', 'stl_relops.h', 'type_traits.h',
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'utility', 'vector', 'vector.h',
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])
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# Non-STL C++ system headers.
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_CPP_HEADERS = frozenset([
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'algo.h', 'builtinbuf.h', 'bvector.h', 'cassert', 'cctype',
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'cerrno', 'cfloat', 'ciso646', 'climits', 'clocale', 'cmath',
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'complex', 'complex.h', 'csetjmp', 'csignal', 'cstdarg', 'cstddef',
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'cstdio', 'cstdlib', 'cstring', 'ctime', 'cwchar', 'cwctype',
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'defalloc.h', 'deque.h', 'editbuf.h', 'exception', 'fstream',
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'fstream.h', 'hashtable.h', 'heap.h', 'indstream.h', 'iomanip',
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'iomanip.h', 'ios', 'iosfwd', 'iostream', 'iostream.h', 'istream',
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'istream.h', 'iterator.h', 'limits', 'map.h', 'multimap.h', 'multiset.h',
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'numeric', 'ostream', 'ostream.h', 'parsestream.h', 'pfstream.h',
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'PlotFile.h', 'procbuf.h', 'pthread_alloc.h', 'rope', 'rope.h',
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'ropeimpl.h', 'SFile.h', 'slist', 'slist.h', 'stack.h', 'stdexcept',
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'stdiostream.h', 'streambuf.h', 'stream.h', 'strfile.h', 'string',
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'strstream', 'strstream.h', 'tempbuf.h', 'tree.h', 'typeinfo', 'valarray',
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])
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# Assertion macros. These are defined in base/logging.h and
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# testing/base/gunit.h. Note that the _M versions need to come first
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# for substring matching to work.
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_CHECK_MACROS = [
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'DCHECK', 'CHECK',
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'EXPECT_TRUE_M', 'EXPECT_TRUE',
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'ASSERT_TRUE_M', 'ASSERT_TRUE',
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'EXPECT_FALSE_M', 'EXPECT_FALSE',
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'ASSERT_FALSE_M', 'ASSERT_FALSE',
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]
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# Replacement macros for CHECK/DCHECK/EXPECT_TRUE/EXPECT_FALSE
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_CHECK_REPLACEMENT = dict([(m, {}) for m in _CHECK_MACROS])
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for op, replacement in [('==', 'EQ'), ('!=', 'NE'),
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('>=', 'GE'), ('>', 'GT'),
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('<=', 'LE'), ('<', 'LT')]:
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_CHECK_REPLACEMENT['DCHECK'][op] = 'DCHECK_%s' % replacement
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_CHECK_REPLACEMENT['CHECK'][op] = 'CHECK_%s' % replacement
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_CHECK_REPLACEMENT['EXPECT_TRUE'][op] = 'EXPECT_%s' % replacement
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_CHECK_REPLACEMENT['ASSERT_TRUE'][op] = 'ASSERT_%s' % replacement
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_CHECK_REPLACEMENT['EXPECT_TRUE_M'][op] = 'EXPECT_%s_M' % replacement
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_CHECK_REPLACEMENT['ASSERT_TRUE_M'][op] = 'ASSERT_%s_M' % replacement
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for op, inv_replacement in [('==', 'NE'), ('!=', 'EQ'),
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('>=', 'LT'), ('>', 'LE'),
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('<=', 'GT'), ('<', 'GE')]:
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_CHECK_REPLACEMENT['EXPECT_FALSE'][op] = 'EXPECT_%s' % inv_replacement
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_CHECK_REPLACEMENT['ASSERT_FALSE'][op] = 'ASSERT_%s' % inv_replacement
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_CHECK_REPLACEMENT['EXPECT_FALSE_M'][op] = 'EXPECT_%s_M' % inv_replacement
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_CHECK_REPLACEMENT['ASSERT_FALSE_M'][op] = 'ASSERT_%s_M' % inv_replacement
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# These constants define types of headers for use with
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# _IncludeState.CheckNextIncludeOrder().
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_C_SYS_HEADER = 1
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_CPP_SYS_HEADER = 2
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_LIKELY_MY_HEADER = 3
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_POSSIBLE_MY_HEADER = 4
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_OTHER_HEADER = 5
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_regexp_compile_cache = {}
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# Finds occurrences of NOLINT or NOLINT(...).
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_RE_SUPPRESSION = re.compile(r'\bNOLINT\b(\([^)]*\))?')
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# {str, set(int)}: a map from error categories to sets of linenumbers
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# on which those errors are expected and should be suppressed.
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_error_suppressions = {}
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def ParseNolintSuppressions(filename, raw_line, linenum, error):
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"""Updates the global list of error-suppressions.
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Parses any NOLINT comments on the current line, updating the global
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error_suppressions store. Reports an error if the NOLINT comment
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was malformed.
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Args:
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filename: str, the name of the input file.
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raw_line: str, the line of input text, with comments.
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linenum: int, the number of the current line.
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error: function, an error handler.
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"""
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# FIXME(adonovan): "NOLINT(" is misparsed as NOLINT(*).
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matched = _RE_SUPPRESSION.search(raw_line)
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if matched:
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category = matched.group(1)
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if category in (None, '(*)'): # => "suppress all"
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_error_suppressions.setdefault(None, set()).add(linenum)
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else:
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if category.startswith('(') and category.endswith(')'):
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category = category[1:-1]
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if category in _ERROR_CATEGORIES:
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_error_suppressions.setdefault(category, set()).add(linenum)
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else:
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error(filename, linenum, 'readability/nolint', 5,
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'Unknown NOLINT error category: %s' % category)
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def ResetNolintSuppressions():
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"Resets the set of NOLINT suppressions to empty."
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_error_suppressions.clear()
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def IsErrorSuppressedByNolint(category, linenum):
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"""Returns true if the specified error category is suppressed on this line.
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Consults the global error_suppressions map populated by
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ParseNolintSuppressions/ResetNolintSuppressions.
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Args:
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category: str, the category of the error.
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linenum: int, the current line number.
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Returns:
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bool, True iff the error should be suppressed due to a NOLINT comment.
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"""
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return (linenum in _error_suppressions.get(category, set()) or
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linenum in _error_suppressions.get(None, set()))
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def Match(pattern, s):
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"""Matches the string with the pattern, caching the compiled regexp."""
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# The regexp compilation caching is inlined in both Match and Search for
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# performance reasons; factoring it out into a separate function turns out
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# to be noticeably expensive.
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if not pattern in _regexp_compile_cache:
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_regexp_compile_cache[pattern] = sre_compile.compile(pattern)
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return _regexp_compile_cache[pattern].match(s)
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def Search(pattern, s):
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"""Searches the string for the pattern, caching the compiled regexp."""
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if not pattern in _regexp_compile_cache:
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_regexp_compile_cache[pattern] = sre_compile.compile(pattern)
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return _regexp_compile_cache[pattern].search(s)
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class _IncludeState(dict):
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"""Tracks line numbers for includes, and the order in which includes appear.
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As a dict, an _IncludeState object serves as a mapping between include
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filename and line number on which that file was included.
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Call CheckNextIncludeOrder() once for each header in the file, passing
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in the type constants defined above. Calls in an illegal order will
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raise an _IncludeError with an appropriate error message.
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"""
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# self._section will move monotonically through this set. If it ever
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# needs to move backwards, CheckNextIncludeOrder will raise an error.
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_INITIAL_SECTION = 0
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_MY_H_SECTION = 1
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_C_SECTION = 2
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_CPP_SECTION = 3
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_OTHER_H_SECTION = 4
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_TYPE_NAMES = {
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_C_SYS_HEADER: 'C system header',
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_CPP_SYS_HEADER: 'C++ system header',
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_LIKELY_MY_HEADER: 'header this file implements',
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_POSSIBLE_MY_HEADER: 'header this file may implement',
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_OTHER_HEADER: 'other header',
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}
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_SECTION_NAMES = {
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_INITIAL_SECTION: "... nothing. (This can't be an error.)",
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_MY_H_SECTION: 'a header this file implements',
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_C_SECTION: 'C system header',
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_CPP_SECTION: 'C++ system header',
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_OTHER_H_SECTION: 'other header',
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}
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def __init__(self):
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dict.__init__(self)
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# The name of the current section.
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self._section = self._INITIAL_SECTION
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# The path of last found header.
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self._last_header = ''
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def CanonicalizeAlphabeticalOrder(self, header_path):
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"""Returns a path canonicalized for alphabetical comparison.
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- replaces "-" with "_" so they both cmp the same.
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- removes '-inl' since we don't require them to be after the main header.
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- lowercase everything, just in case.
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Args:
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header_path: Path to be canonicalized.
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Returns:
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Canonicalized path.
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"""
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return header_path.replace('-inl.h', '.h').replace('-', '_').lower()
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def IsInAlphabeticalOrder(self, header_path):
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"""Check if a header is in alphabetical order with the previous header.
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Args:
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header_path: Header to be checked.
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Returns:
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Returns true if the header is in alphabetical order.
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"""
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canonical_header = self.CanonicalizeAlphabeticalOrder(header_path)
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if self._last_header > canonical_header:
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return False
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self._last_header = canonical_header
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return True
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def CheckNextIncludeOrder(self, header_type):
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"""Returns a non-empty error message if the next header is out of order.
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This function also updates the internal state to be ready to check
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the next include.
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Args:
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header_type: One of the _XXX_HEADER constants defined above.
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Returns:
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The empty string if the header is in the right order, or an
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error message describing what's wrong.
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"""
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error_message = ('Found %s after %s' %
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(self._TYPE_NAMES[header_type],
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self._SECTION_NAMES[self._section]))
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last_section = self._section
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if header_type == _C_SYS_HEADER:
|
|
if self._section <= self._C_SECTION:
|
|
self._section = self._C_SECTION
|
|
else:
|
|
self._last_header = ''
|
|
return error_message
|
|
elif header_type == _CPP_SYS_HEADER:
|
|
if self._section <= self._CPP_SECTION:
|
|
self._section = self._CPP_SECTION
|
|
else:
|
|
self._last_header = ''
|
|
return error_message
|
|
elif header_type == _LIKELY_MY_HEADER:
|
|
if self._section <= self._MY_H_SECTION:
|
|
self._section = self._MY_H_SECTION
|
|
else:
|
|
self._section = self._OTHER_H_SECTION
|
|
elif header_type == _POSSIBLE_MY_HEADER:
|
|
if self._section <= self._MY_H_SECTION:
|
|
self._section = self._MY_H_SECTION
|
|
else:
|
|
# This will always be the fallback because we're not sure
|
|
# enough that the header is associated with this file.
|
|
self._section = self._OTHER_H_SECTION
|
|
else:
|
|
assert header_type == _OTHER_HEADER
|
|
self._section = self._OTHER_H_SECTION
|
|
|
|
if last_section != self._section:
|
|
self._last_header = ''
|
|
|
|
return ''
|
|
|
|
|
|
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[:]
|
|
self.counting = 'total' # In what way are we counting errors?
|
|
self.errors_by_category = {} # string to int dict storing error counts
|
|
|
|
# output format:
|
|
# "emacs" - format that emacs can parse (default)
|
|
# "vs7" - format that Microsoft Visual Studio 7 can parse
|
|
self.output_format = 'emacs'
|
|
|
|
def SetOutputFormat(self, output_format):
|
|
"""Sets the output format for errors."""
|
|
self.output_format = output_format
|
|
|
|
def SetVerboseLevel(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 SetCountingStyle(self, counting_style):
|
|
"""Sets the module's counting options."""
|
|
self.counting = counting_style
|
|
|
|
def SetFilters(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 filt in filters.split(','):
|
|
clean_filt = filt.strip()
|
|
if clean_filt:
|
|
self.filters.append(clean_filt)
|
|
for filt in self.filters:
|
|
if not (filt.startswith('+') or filt.startswith('-')):
|
|
raise ValueError('Every filter in --filters must start with + or -'
|
|
' (%s does not)' % filt)
|
|
|
|
def ResetErrorCounts(self):
|
|
"""Sets the module's error statistic back to zero."""
|
|
self.error_count = 0
|
|
self.errors_by_category = {}
|
|
|
|
def IncrementErrorCount(self, category):
|
|
"""Bumps the module's error statistic."""
|
|
self.error_count += 1
|
|
if self.counting in ('toplevel', 'detailed'):
|
|
if self.counting != 'detailed':
|
|
category = category.split('/')[0]
|
|
if category not in self.errors_by_category:
|
|
self.errors_by_category[category] = 0
|
|
self.errors_by_category[category] += 1
|
|
|
|
def PrintErrorCounts(self):
|
|
"""Print a summary of errors by category, and the total."""
|
|
for category, count in self.errors_by_category.iteritems():
|
|
sys.stderr.write('Category \'%s\' errors found: %d\n' %
|
|
(category, count))
|
|
sys.stderr.write('Total errors found: %d\n' % self.error_count)
|
|
|
|
_cpplint_state = _CppLintState()
|
|
|
|
|
|
def _OutputFormat():
|
|
"""Gets the module's output format."""
|
|
return _cpplint_state.output_format
|
|
|
|
|
|
def _SetOutputFormat(output_format):
|
|
"""Sets the module's output format."""
|
|
_cpplint_state.SetOutputFormat(output_format)
|
|
|
|
|
|
def _VerboseLevel():
|
|
"""Returns the module's verbosity setting."""
|
|
return _cpplint_state.verbose_level
|
|
|
|
|
|
def _SetVerboseLevel(level):
|
|
"""Sets the module's verbosity, and returns the previous setting."""
|
|
return _cpplint_state.SetVerboseLevel(level)
|
|
|
|
|
|
def _SetCountingStyle(level):
|
|
"""Sets the module's counting options."""
|
|
_cpplint_state.SetCountingStyle(level)
|
|
|
|
|
|
def _Filters():
|
|
"""Returns the module's list of output filters, as a list."""
|
|
return _cpplint_state.filters
|
|
|
|
|
|
def _SetFilters(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.SetFilters(filters)
|
|
|
|
|
|
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, linenum):
|
|
"""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.
|
|
linenum: 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**_VerboseLevel()
|
|
|
|
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, linenum, '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 analyzing 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 FullName(self):
|
|
"""Make Windows paths like Unix."""
|
|
return os.path.abspath(self._filename).replace('\\', '/')
|
|
|
|
def RepositoryName(self):
|
|
"""FullName 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.FullName()
|
|
|
|
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 <= 1.6? Try to find a git, hg, or svn 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")) and
|
|
not os.path.exists(os.path.join(root_dir, ".hg")) and
|
|
not os.path.exists(os.path.join(root_dir, ".svn"))):
|
|
root_dir = os.path.dirname(root_dir)
|
|
|
|
if (os.path.exists(os.path.join(root_dir, ".git")) or
|
|
os.path.exists(os.path.join(root_dir, ".hg")) or
|
|
os.path.exists(os.path.join(root_dir, ".svn"))):
|
|
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.cc', Split() would
|
|
return ('chrome/browser', 'browser', '.cc')
|
|
|
|
Returns:
|
|
A tuple of (directory, basename, extension).
|
|
"""
|
|
|
|
googlename = self.RepositoryName()
|
|
project, rest = os.path.split(googlename)
|
|
return (project,) + os.path.splitext(rest)
|
|
|
|
def BaseName(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 NoExtension(self):
|
|
"""File has no source file extension."""
|
|
return '/'.join(self.Split()[0:2])
|
|
|
|
def IsSource(self):
|
|
"""File has a source file extension."""
|
|
return self.Extension()[1:] in ('c', 'cc', 'cpp', 'cxx')
|
|
|
|
|
|
def _ShouldPrintError(category, confidence, linenum):
|
|
"""If confidence >= verbose, category passes filter and is not suppressed."""
|
|
|
|
# There are three ways we might decide not to print an error message:
|
|
# a "NOLINT(category)" comment appears in the source,
|
|
# the verbosity level isn't high enough, or the filters filter it out.
|
|
if IsErrorSuppressedByNolint(category, linenum):
|
|
return False
|
|
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 SetFilter.
|
|
if is_filtered:
|
|
return False
|
|
|
|
return True
|
|
|
|
|
|
def Error(filename, linenum, 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.
|
|
|
|
False positives can be suppressed by the use of
|
|
"cpplint(category)" comments on the offending line. These are
|
|
parsed into _error_suppressions.
|
|
|
|
Args:
|
|
filename: The name of the file containing the error.
|
|
linenum: 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.
|
|
"""
|
|
if _ShouldPrintError(category, confidence, linenum):
|
|
_cpplint_state.IncrementErrorCount(category)
|
|
if _cpplint_state.output_format == 'vs7':
|
|
sys.stderr.write('%s(%s): %s [%s] [%d]\n' % (
|
|
filename, linenum, message, category, confidence))
|
|
else:
|
|
sys.stderr.write('%s:%s: %s [%s] [%d]\n' % (
|
|
filename, linenum, 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 IsCppString(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 FindNextMultiLineCommentStart(lines, lineix):
|
|
"""Find the beginning marker for a multiline comment."""
|
|
while lineix < len(lines):
|
|
if lines[lineix].strip().startswith('/*'):
|
|
# Only return this marker if the comment goes beyond this line
|
|
if lines[lineix].strip().find('*/', 2) < 0:
|
|
return lineix
|
|
lineix += 1
|
|
return len(lines)
|
|
|
|
|
|
def FindNextMultiLineCommentEnd(lines, lineix):
|
|
"""We are inside a comment, find the end marker."""
|
|
while lineix < len(lines):
|
|
if lines[lineix].strip().endswith('*/'):
|
|
return lineix
|
|
lineix += 1
|
|
return len(lines)
|
|
|
|
|
|
def RemoveMultiLineCommentsFromRange(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 RemoveMultiLineComments(filename, lines, error):
|
|
"""Removes multiline (c-style) comments from lines."""
|
|
lineix = 0
|
|
while lineix < len(lines):
|
|
lineix_begin = FindNextMultiLineCommentStart(lines, lineix)
|
|
if lineix_begin >= len(lines):
|
|
return
|
|
lineix_end = FindNextMultiLineCommentEnd(lines, lineix_begin)
|
|
if lineix_end >= len(lines):
|
|
error(filename, lineix_begin + 1, 'readability/multiline_comment', 5,
|
|
'Could not find end of multi-line comment')
|
|
return
|
|
RemoveMultiLineCommentsFromRange(lines, lineix_begin, lineix_end + 1)
|
|
lineix = lineix_end + 1
|
|
|
|
|
|
def CleanseComments(line):
|
|
"""Removes //-comments and single-line C-style /* */ comments.
|
|
|
|
Args:
|
|
line: A line of C++ source.
|
|
|
|
Returns:
|
|
The line with single-line comments removed.
|
|
"""
|
|
commentpos = line.find('//')
|
|
if commentpos != -1 and not IsCppString(line[:commentpos]):
|
|
line = line[:commentpos].rstrip()
|
|
# 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 <type 'list'>, and of the same length.
|
|
"""
|
|
|
|
def __init__(self, lines):
|
|
self.elided = []
|
|
self.lines = []
|
|
self.raw_lines = lines
|
|
self.num_lines = len(lines)
|
|
for linenum in range(len(lines)):
|
|
self.lines.append(CleanseComments(lines[linenum]))
|
|
elided = self._CollapseStrings(lines[linenum])
|
|
self.elided.append(CleanseComments(elided))
|
|
|
|
def NumLines(self):
|
|
"""Returns the number of lines represented."""
|
|
return self.num_lines
|
|
|
|
@staticmethod
|
|
def _CollapseStrings(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 CloseExpression(clean_lines, linenum, pos):
|
|
"""If input points to ( or { or [, finds the position that closes it.
|
|
|
|
If lines[linenum][pos] points to a '(' or '{' or '[', finds the
|
|
linenum/pos that correspond to the closing of the expression.
|
|
|
|
Args:
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
pos: A position on the line.
|
|
|
|
Returns:
|
|
A tuple (line, linenum, 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 linenum.
|
|
"""
|
|
|
|
line = clean_lines.elided[linenum]
|
|
startchar = line[pos]
|
|
if startchar not in '({[':
|
|
return (line, clean_lines.NumLines(), -1)
|
|
if startchar == '(': endchar = ')'
|
|
if startchar == '[': endchar = ']'
|
|
if startchar == '{': endchar = '}'
|
|
|
|
num_open = line.count(startchar) - line.count(endchar)
|
|
while linenum < clean_lines.NumLines() and num_open > 0:
|
|
linenum += 1
|
|
line = clean_lines.elided[linenum]
|
|
num_open += line.count(startchar) - line.count(endchar)
|
|
# OK, now find the endchar 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, linenum, endpos + 1)
|
|
|
|
|
|
def CheckForCopyright(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', lines[line], re.I): break
|
|
else: # means no copyright line was found
|
|
error(filename, 0, 'legal/copyright', 5,
|
|
'No copyright message found. '
|
|
'You should have a line: "Copyright [year] <Copyright Owner>"')
|
|
|
|
|
|
def GetHeaderGuardCPPVariable(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.
|
|
|
|
"""
|
|
|
|
# Restores original filename in case that cpplint is invoked from Emacs's
|
|
# flymake.
|
|
filename = re.sub(r'_flymake\.h$', '.h', filename)
|
|
|
|
fileinfo = FileInfo(filename)
|
|
return re.sub(r'[-./\s]', '_', fileinfo.RepositoryName()).upper() + '_'
|
|
|
|
|
|
def CheckForHeaderGuard(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 = GetHeaderGuardCPPVariable(filename)
|
|
|
|
ifndef = None
|
|
ifndef_linenum = 0
|
|
define = None
|
|
endif = None
|
|
endif_linenum = 0
|
|
for linenum, line in enumerate(lines):
|
|
linesplit = line.split()
|
|
if len(linesplit) >= 2:
|
|
# find the first occurrence of #ifndef and #define, save arg
|
|
if not ifndef and linesplit[0] == '#ifndef':
|
|
# set ifndef to the header guard presented on the #ifndef line.
|
|
ifndef = linesplit[1]
|
|
ifndef_linenum = linenum
|
|
if not define and linesplit[0] == '#define':
|
|
define = linesplit[1]
|
|
# find the last occurrence of #endif, save entire line
|
|
if line.startswith('#endif'):
|
|
endif = line
|
|
endif_linenum = linenum
|
|
|
|
if not ifndef:
|
|
error(filename, 0, 'build/header_guard', 5,
|
|
'No #ifndef header guard found, suggested CPP variable is: %s' %
|
|
cppvar)
|
|
return
|
|
|
|
if not define:
|
|
error(filename, 0, 'build/header_guard', 5,
|
|
'No #define 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
|
|
|
|
ParseNolintSuppressions(filename, lines[ifndef_linenum], ifndef_linenum,
|
|
error)
|
|
error(filename, ifndef_linenum, 'build/header_guard', error_level,
|
|
'#ifndef header guard has wrong style, please use: %s' % cppvar)
|
|
|
|
if define != ifndef:
|
|
error(filename, 0, 'build/header_guard', 5,
|
|
'#ifndef and #define don\'t match, suggested CPP variable is: %s' %
|
|
cppvar)
|
|
return
|
|
|
|
if endif != ('#endif // %s' % cppvar):
|
|
error_level = 0
|
|
if endif != ('#endif // %s' % (cppvar + '_')):
|
|
error_level = 5
|
|
|
|
ParseNolintSuppressions(filename, lines[endif_linenum], endif_linenum,
|
|
error)
|
|
error(filename, endif_linenum, 'build/header_guard', error_level,
|
|
'#endif line should be "#endif // %s"' % cppvar)
|
|
|
|
|
|
def CheckForUnicodeReplacementCharacters(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 linenum, line in enumerate(lines):
|
|
if u'\ufffd' in line:
|
|
error(filename, linenum, 'readability/utf8', 5,
|
|
'Line contains invalid UTF-8 (or Unicode replacement character).')
|
|
|
|
|
|
def CheckForNewlineAtEOF(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 CheckForMultilineCommentsAndStrings(filename, clean_lines, linenum, 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.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
line = clean_lines.elided[linenum]
|
|
|
|
# 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, linenum, '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, linenum, '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 CheckPosixThreading(filename, clean_lines, linenum, 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.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
line = clean_lines.elided[linenum]
|
|
for single_thread_function, multithread_safe_function in threading_list:
|
|
ix = line.find(single_thread_function)
|
|
# Comparisons made explicit for clarity -- pylint: disable-msg=C6403
|
|
if ix >= 0 and (ix == 0 or (not line[ix - 1].isalnum() and
|
|
line[ix - 1] not in ('_', '.', '>'))):
|
|
error(filename, linenum, '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 CheckInvalidIncrement(filename, clean_lines, linenum, 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.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
line = clean_lines.elided[linenum]
|
|
if _RE_PATTERN_INVALID_INCREMENT.match(line):
|
|
error(filename, linenum, '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, clean_lines, linenum):
|
|
self.name = name
|
|
self.linenum = linenum
|
|
self.seen_open_brace = False
|
|
self.is_derived = False
|
|
self.virtual_method_linenumber = None
|
|
self.has_virtual_destructor = False
|
|
self.brace_depth = 0
|
|
|
|
# Try to find the end of the class. This will be confused by things like:
|
|
# class A {
|
|
# } *x = { ...
|
|
#
|
|
# But it's still good enough for CheckSectionSpacing.
|
|
self.last_line = 0
|
|
depth = 0
|
|
for i in range(linenum, clean_lines.NumLines()):
|
|
line = clean_lines.lines[i]
|
|
depth += line.count('{') - line.count('}')
|
|
if not depth:
|
|
self.last_line = i
|
|
break
|
|
|
|
|
|
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 CheckFinished(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].linenum, 'build/class', 5,
|
|
'Failed to find complete declaration of class %s' %
|
|
self.classinfo_stack[0].name)
|
|
|
|
|
|
def CheckForNonStandardConstructs(filename, clean_lines, linenum,
|
|
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 <? operators, and their >?= and <?= cousins.
|
|
- classes with virtual methods need virtual destructors (compiler warning
|
|
available, but not turned on yet.)
|
|
|
|
Additionally, check for constructor/destructor style violations and reference
|
|
members, as it is very convenient to do so while checking for
|
|
gcc-2 compliance.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
class_state: A _ClassState instance which maintains information about
|
|
the current stack of nested class declarations being parsed.
|
|
error: A callable to which errors are reported, which takes 4 arguments:
|
|
filename, line number, error level, and message
|
|
"""
|
|
|
|
# Remove comments from the line, but leave in strings for now.
|
|
line = clean_lines.lines[linenum]
|
|
|
|
if Search(r'printf\s*\(.*".*%[-+ ]?\d*q', line):
|
|
error(filename, linenum, 'runtime/printf_format', 3,
|
|
'%q in format strings is deprecated. Use %ll instead.')
|
|
|
|
if Search(r'printf\s*\(.*".*%\d+\$', line):
|
|
error(filename, linenum, 'runtime/printf_format', 2,
|
|
'%N$ formats are unconventional. Try rewriting to avoid them.')
|
|
|
|
# Remove escaped backslashes before looking for undefined escapes.
|
|
line = line.replace('\\\\', '')
|
|
|
|
if Search(r'("|\').*\\(%|\[|\(|{)', line):
|
|
error(filename, linenum, 'build/printf_format', 3,
|
|
'%, [, (, and { are undefined character escapes. Unescape them.')
|
|
|
|
# For the rest, work with both comments and strings removed.
|
|
line = clean_lines.elided[linenum]
|
|
|
|
if Search(r'\b(const|volatile|void|char|short|int|long'
|
|
r'|float|double|signed|unsigned'
|
|
r'|schar|u?int8|u?int16|u?int32|u?int64)'
|
|
r'\s+(auto|register|static|extern|typedef)\b',
|
|
line):
|
|
error(filename, linenum, 'build/storage_class', 5,
|
|
'Storage class (static, extern, typedef, etc) should be first.')
|
|
|
|
if Match(r'\s*#\s*endif\s*[^/\s]+', line):
|
|
error(filename, linenum, 'build/endif_comment', 5,
|
|
'Uncommented text after #endif is non-standard. Use a comment.')
|
|
|
|
if Match(r'\s*class\s+(\w+\s*::\s*)+\w+\s*;', line):
|
|
error(filename, linenum, 'build/forward_decl', 5,
|
|
'Inner-style forward declarations are invalid. Remove this line.')
|
|
|
|
if Search(r'(\w+|[+-]?\d+(\.\d*)?)\s*(<|>)\?=?\s*(\w+|[+-]?\d+)(\.\d*)?',
|
|
line):
|
|
error(filename, linenum, 'build/deprecated', 3,
|
|
'>? and <? (max and min) operators are non-standard and deprecated.')
|
|
|
|
if Search(r'^\s*const\s*string\s*&\s*\w+\s*;', line):
|
|
# TODO(unknown): Could it be expanded safely to arbitrary references,
|
|
# without triggering too many false positives? The first
|
|
# attempt triggered 5 warnings for mostly benign code in the regtest, hence
|
|
# the restriction.
|
|
# Here's the original regexp, for the reference:
|
|
# type_name = r'\w+((\s*::\s*\w+)|(\s*<\s*\w+?\s*>))?'
|
|
# r'\s*const\s*' + type_name + '\s*&\s*\w+\s*;'
|
|
error(filename, linenum, 'runtime/member_string_references', 2,
|
|
'const string& members are dangerous. It is much better to use '
|
|
'alternatives, such as pointers or simple constants.')
|
|
|
|
# Track class entry and exit, and attempt to find cases within the
|
|
# class declaration that don't meet the C++ style
|
|
# guidelines. Tracking is very dependent on the code matching Google
|
|
# style guidelines, but it seems to perform well enough in testing
|
|
# to be a worthwhile addition to the checks.
|
|
classinfo_stack = class_state.classinfo_stack
|
|
# Look for a class declaration. The regexp accounts for decorated classes
|
|
# such as in:
|
|
# class LOCKABLE API Object {
|
|
# };
|
|
class_decl_match = Match(
|
|
r'\s*(template\s*<[\w\s<>,:]*>\s*)?'
|
|
'(class|struct)\s+([A-Z_]+\s+)*(\w+(::\w+)*)', line)
|
|
if class_decl_match:
|
|
classinfo_stack.append(_ClassInfo(
|
|
class_decl_match.group(4), clean_lines, linenum))
|
|
|
|
# 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'\s+(?:inline\s+)?%s\s*\(([^,()]+)\)'
|
|
% re.escape(base_classname),
|
|
line)
|
|
if (args and
|
|
args.group(1) != 'void' and
|
|
not Match(r'(const\s+)?%s\s*(?:<\w+>\s*)?&' % re.escape(base_classname),
|
|
args.group(1).strip())):
|
|
error(filename, linenum, 'runtime/explicit', 5,
|
|
'Single-argument constructors should be marked explicit.')
|
|
|
|
# Look for methods declared virtual.
|
|
if Search(r'\bvirtual\b', line):
|
|
classinfo.virtual_method_linenumber = linenum
|
|
# Only look for a destructor declaration on the same line. It would
|
|
# be extremely unlikely for the destructor declaration to occupy
|
|
# more than one line.
|
|
if Search(r'~%s\s*\(' % base_classname, line):
|
|
classinfo.has_virtual_destructor = True
|
|
|
|
# Look for class end.
|
|
brace_depth = classinfo.brace_depth
|
|
brace_depth = brace_depth + line.count('{') - line.count('}')
|
|
if brace_depth <= 0:
|
|
classinfo = classinfo_stack.pop()
|
|
# Try to detect missing virtual destructor declarations.
|
|
# For now, only warn if a non-derived class with virtual methods lacks
|
|
# a virtual destructor. This is to make it less likely that people will
|
|
# declare derived virtual destructors without declaring the base
|
|
# destructor virtual.
|
|
if ((classinfo.virtual_method_linenumber is not None) and
|
|
(not classinfo.has_virtual_destructor) and
|
|
(not classinfo.is_derived)): # Only warn for base classes
|
|
error(filename, classinfo.linenum, 'runtime/virtual', 4,
|
|
'The class %s probably needs a virtual destructor due to '
|
|
'having virtual method(s), one declared at line %d.'
|
|
% (classinfo.name, classinfo.virtual_method_linenumber))
|
|
else:
|
|
classinfo.brace_depth = brace_depth
|
|
|
|
|
|
def CheckSpacingForFunctionCall(filename, line, linenum, error):
|
|
"""Checks for the correctness of various spacing around function calls.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
line: The text of the line to check.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
|
|
# Since function calls often occur inside if/for/while/switch
|
|
# expressions - which have their own, more liberal conventions - we
|
|
# first see if we should be looking inside such an expression for a
|
|
# function call, to which we can apply more strict standards.
|
|
fncall = line # if there's no control flow construct, look at whole line
|
|
for pattern in (r'\bif\s*\((.*)\)\s*{',
|
|
r'\bfor\s*\((.*)\)\s*{',
|
|
r'\bwhile\s*\((.*)\)\s*[{;]',
|
|
r'\bswitch\s*\((.*)\)\s*{'):
|
|
match = Search(pattern, line)
|
|
if match:
|
|
fncall = match.group(1) # look inside the parens for function calls
|
|
break
|
|
|
|
# Except in if/for/while/switch, there should never be space
|
|
# immediately inside parens (eg "f( 3, 4 )"). We make an exception
|
|
# for nested parens ( (a+b) + c ). Likewise, there should never be
|
|
# a space before a ( when it's a function argument. I assume it's a
|
|
# function argument when the char before the whitespace is legal in
|
|
# a function name (alnum + _) and we're not starting a macro. Also ignore
|
|
# pointers and references to arrays and functions coz they're too tricky:
|
|
# we use a very simple way to recognize these:
|
|
# " (something)(maybe-something)" or
|
|
# " (something)(maybe-something," or
|
|
# " (something)[something]"
|
|
# Note that we assume the contents of [] to be short enough that
|
|
# they'll never need to wrap.
|
|
if ( # Ignore control structures.
|
|
not Search(r'\b(if|for|while|switch|return|delete)\b', fncall) and
|
|
# Ignore pointers/references to functions.
|
|
not Search(r' \([^)]+\)\([^)]*(\)|,$)', fncall) and
|
|
# Ignore pointers/references to arrays.
|
|
not Search(r' \([^)]+\)\[[^\]]+\]', fncall)):
|
|
if Search(r'\w\s*\(\s(?!\s*\\$)', fncall): # a ( used for a fn call
|
|
error(filename, linenum, 'whitespace/parens', 4,
|
|
'Extra space after ( in function call')
|
|
elif Search(r'\(\s+(?!(\s*\\)|\()', fncall):
|
|
error(filename, linenum, 'whitespace/parens', 2,
|
|
'Extra space after (')
|
|
if (Search(r'\w\s+\(', fncall) and
|
|
not Search(r'#\s*define|typedef', fncall)):
|
|
error(filename, linenum, 'whitespace/parens', 4,
|
|
'Extra space before ( in function call')
|
|
# If the ) is followed only by a newline or a { + newline, assume it's
|
|
# part of a control statement (if/while/etc), and don't complain
|
|
if Search(r'[^)]\s+\)\s*[^{\s]', fncall):
|
|
# If the closing parenthesis is preceded by only whitespaces,
|
|
# try to give a more descriptive error message.
|
|
if Search(r'^\s+\)', fncall):
|
|
error(filename, linenum, 'whitespace/parens', 2,
|
|
'Closing ) should be moved to the previous line')
|
|
else:
|
|
error(filename, linenum, 'whitespace/parens', 2,
|
|
'Extra space before )')
|
|
|
|
|
|
def IsBlankLine(line):
|
|
"""Returns true if the given line is blank.
|
|
|
|
We consider a line to be blank if the line is empty or consists of
|
|
only white spaces.
|
|
|
|
Args:
|
|
line: A line of a string.
|
|
|
|
Returns:
|
|
True, if the given line is blank.
|
|
"""
|
|
return not line or line.isspace()
|
|
|
|
|
|
def CheckForFunctionLengths(filename, clean_lines, linenum,
|
|
function_state, error):
|
|
"""Reports for long function bodies.
|
|
|
|
For an overview why this is done, see:
|
|
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Write_Short_Functions
|
|
|
|
Uses a simplistic algorithm assuming other style guidelines
|
|
(especially spacing) are followed.
|
|
Only checks unindented functions, so class members are unchecked.
|
|
Trivial bodies are unchecked, so constructors with huge initializer lists
|
|
may be missed.
|
|
Blank/comment lines are not counted so as to avoid encouraging the removal
|
|
of vertical space and comments just to get through a lint check.
|
|
NOLINT *on the last line of a function* disables this check.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
function_state: Current function name and lines in body so far.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
lines = clean_lines.lines
|
|
line = lines[linenum]
|
|
raw = clean_lines.raw_lines
|
|
raw_line = raw[linenum]
|
|
joined_line = ''
|
|
|
|
starting_func = False
|
|
regexp = r'(\w(\w|::|\*|\&|\s)*)\(' # decls * & space::name( ...
|
|
match_result = Match(regexp, line)
|
|
if match_result:
|
|
# If the name is all caps and underscores, figure it's a macro and
|
|
# ignore it, unless it's TEST or TEST_F.
|
|
function_name = match_result.group(1).split()[-1]
|
|
if function_name == 'TEST' or function_name == 'TEST_F' or (
|
|
not Match(r'[A-Z_]+$', function_name)):
|
|
starting_func = True
|
|
|
|
if starting_func:
|
|
body_found = False
|
|
for start_linenum in xrange(linenum, clean_lines.NumLines()):
|
|
start_line = lines[start_linenum]
|
|
joined_line += ' ' + start_line.lstrip()
|
|
if Search(r'(;|})', start_line): # Declarations and trivial functions
|
|
body_found = True
|
|
break # ... ignore
|
|
elif Search(r'{', start_line):
|
|
body_found = True
|
|
function = Search(r'((\w|:)*)\(', line).group(1)
|
|
if Match(r'TEST', function): # Handle TEST... macros
|
|
parameter_regexp = Search(r'(\(.*\))', joined_line)
|
|
if parameter_regexp: # Ignore bad syntax
|
|
function += parameter_regexp.group(1)
|
|
else:
|
|
function += '()'
|
|
function_state.Begin(function)
|
|
break
|
|
if not body_found:
|
|
# No body for the function (or evidence of a non-function) was found.
|
|
error(filename, linenum, 'readability/fn_size', 5,
|
|
'Lint failed to find start of function body.')
|
|
elif Match(r'^\}\s*$', line): # function end
|
|
function_state.Check(error, filename, linenum)
|
|
function_state.End()
|
|
elif not Match(r'^\s*$', line):
|
|
function_state.Count() # Count non-blank/non-comment lines.
|
|
|
|
|
|
_RE_PATTERN_TODO = re.compile(r'^//(\s*)TODO(\(.+?\))?:?(\s|$)?')
|
|
|
|
|
|
def CheckComment(comment, filename, linenum, error):
|
|
"""Checks for common mistakes in TODO comments.
|
|
|
|
Args:
|
|
comment: The text of the comment from the line in question.
|
|
filename: The name of the current file.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
match = _RE_PATTERN_TODO.match(comment)
|
|
if match:
|
|
# One whitespace is correct; zero whitespace is handled elsewhere.
|
|
leading_whitespace = match.group(1)
|
|
if len(leading_whitespace) > 1:
|
|
error(filename, linenum, 'whitespace/todo', 2,
|
|
'Too many spaces before TODO')
|
|
|
|
username = match.group(2)
|
|
if not username:
|
|
error(filename, linenum, 'readability/todo', 2,
|
|
'Missing username in TODO; it should look like '
|
|
'"// TODO(my_username): Stuff."')
|
|
|
|
middle_whitespace = match.group(3)
|
|
# Comparisons made explicit for correctness -- pylint: disable-msg=C6403
|
|
if middle_whitespace != ' ' and middle_whitespace != '':
|
|
error(filename, linenum, 'whitespace/todo', 2,
|
|
'TODO(my_username) should be followed by a space')
|
|
|
|
|
|
def CheckSpacing(filename, clean_lines, linenum, error):
|
|
"""Checks for the correctness of various spacing issues in the code.
|
|
|
|
Things we check for: spaces around operators, spaces after
|
|
if/for/while/switch, no spaces around parens in function calls, two
|
|
spaces between code and comment, don't start a block with a blank
|
|
line, don't end a function with a blank line, don't add a blank line
|
|
after public/protected/private, don't have too many blank lines in a row.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
|
|
raw = clean_lines.raw_lines
|
|
line = raw[linenum]
|
|
|
|
# Before nixing comments, check if the line is blank for no good
|
|
# reason. This includes the first line after a block is opened, and
|
|
# blank lines at the end of a function (ie, right before a line like '}'
|
|
if IsBlankLine(line):
|
|
elided = clean_lines.elided
|
|
prev_line = elided[linenum - 1]
|
|
prevbrace = prev_line.rfind('{')
|
|
# TODO(unknown): Don't complain if line before blank line, and line after,
|
|
# both start with alnums and are indented the same amount.
|
|
# This ignores whitespace at the start of a namespace block
|
|
# because those are not usually indented.
|
|
if (prevbrace != -1 and prev_line[prevbrace:].find('}') == -1
|
|
and prev_line[:prevbrace].find('namespace') == -1):
|
|
# OK, we have a blank line at the start of a code block. Before we
|
|
# complain, we check if it is an exception to the rule: The previous
|
|
# non-empty line has the parameters of a function header that are indented
|
|
# 4 spaces (because they did not fit in a 80 column line when placed on
|
|
# the same line as the function name). We also check for the case where
|
|
# the previous line is indented 6 spaces, which may happen when the
|
|
# initializers of a constructor do not fit into a 80 column line.
|
|
exception = False
|
|
if Match(r' {6}\w', prev_line): # Initializer list?
|
|
# We are looking for the opening column of initializer list, which
|
|
# should be indented 4 spaces to cause 6 space indentation afterwards.
|
|
search_position = linenum-2
|
|
while (search_position >= 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*$|:)',
|
|
prev_line)
|
|
or Match(r' {4}:', prev_line))
|
|
|
|
if not exception:
|
|
error(filename, linenum, '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 linenum + 1 < clean_lines.NumLines():
|
|
next_line = raw[linenum + 1]
|
|
if (next_line
|
|
and Match(r'\s*}', next_line)
|
|
and next_line.find('namespace') == -1
|
|
and next_line.find('} else ') == -1):
|
|
error(filename, linenum, 'whitespace/blank_line', 3,
|
|
'Blank line at the end of a code block. Is this needed?')
|
|
|
|
matched = Match(r'\s*(public|protected|private):', prev_line)
|
|
if matched:
|
|
error(filename, linenum, 'whitespace/blank_line', 3,
|
|
'Do not leave a blank line after "%s:"' % matched.group(1))
|
|
|
|
# Next, we complain if there's a comment too near the text
|
|
commentpos = line.find('//')
|
|
if commentpos != -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, commentpos) -
|
|
line.count('\\"', 0, commentpos)) % 2 == 0: # not in quotes
|
|
# Allow one space for new scopes, two spaces otherwise:
|
|
if (not Match(r'^\s*{ //', line) and
|
|
((commentpos >= 1 and
|
|
line[commentpos-1] not in string.whitespace) or
|
|
(commentpos >= 2 and
|
|
line[commentpos-2] not in string.whitespace))):
|
|
error(filename, linenum, 'whitespace/comments', 2,
|
|
'At least two spaces is best between code and comments')
|
|
# There should always be a space between the // and the comment
|
|
commentend = commentpos + 2
|
|
if commentend < len(line) and not line[commentend] == ' ':
|
|
# but some lines are exceptions -- e.g. if they're big
|
|
# comment delimiters like:
|
|
# //----------------------------------------------------------
|
|
# or are an empty C++ style Doxygen comment, like:
|
|
# ///
|
|
# or they begin with multiple slashes followed by a space:
|
|
# //////// Header comment
|
|
match = (Search(r'[=/-]{4,}\s*$', line[commentend:]) or
|
|
Search(r'^/$', line[commentend:]) or
|
|
Search(r'^/+ ', line[commentend:]))
|
|
if not match:
|
|
error(filename, linenum, 'whitespace/comments', 4,
|
|
'Should have a space between // and comment')
|
|
CheckComment(line[commentpos:], filename, linenum, error)
|
|
|
|
line = clean_lines.elided[linenum] # 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, linenum, 'whitespace/operators', 4,
|
|
'Missing spaces around =')
|
|
|
|
# It's ok not to have spaces around binary operators like + - * /, but if
|
|
# there's too little whitespace, we get concerned. It's hard to tell,
|
|
# though, so we punt on this one for now. TODO.
|
|
|
|
# You should always have whitespace around binary operators.
|
|
# Alas, we can't test < or > because they're legitimately used sans spaces
|
|
# (a->b, vector<int> 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.
|
|
match = Search(r'[^<>=!\s](==|!=|<=|>=)[^<>=!\s]', line)
|
|
if not match:
|
|
# 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*$', line): # template params spill
|
|
match = Search(r'[^<>=!\s](<)[^<>=!\s]([^>]|->)*$', line)
|
|
if match:
|
|
error(filename, linenum, 'whitespace/operators', 3,
|
|
'Missing spaces around %s' % match.group(1))
|
|
# We allow no-spaces around << and >> when used like this: 10<<20, but
|
|
# not otherwise (particularly, not when used as streams)
|
|
match = Search(r'[^0-9\s](<<|>>)[^0-9\s]', line)
|
|
if match:
|
|
error(filename, linenum, 'whitespace/operators', 3,
|
|
'Missing spaces around %s' % match.group(1))
|
|
|
|
# There shouldn't be space around unary operators
|
|
match = Search(r'(!\s|~\s|[\s]--[\s;]|[\s]\+\+[\s;])', line)
|
|
if match:
|
|
error(filename, linenum, 'whitespace/operators', 4,
|
|
'Extra space for operator %s' % match.group(1))
|
|
|
|
# A pet peeve of mine: no spaces after an if, while, switch, or for
|
|
match = Search(r' (if\(|for\(|while\(|switch\()', line)
|
|
if match:
|
|
error(filename, linenum, 'whitespace/parens', 5,
|
|
'Missing space before ( in %s' % match.group(1))
|
|
|
|
# For if/for/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.
|
|
match = Search(r'\b(if|for|while|switch)\s*'
|
|
r'\(([ ]*)(.).*[^ ]+([ ]*)\)\s*{\s*$',
|
|
line)
|
|
if match:
|
|
if len(match.group(2)) != len(match.group(4)):
|
|
if not (match.group(3) == ';' and
|
|
len(match.group(2)) == 1 + len(match.group(4)) or
|
|
not match.group(2) and Search(r'\bfor\s*\(.*; \)', line)):
|
|
error(filename, linenum, 'whitespace/parens', 5,
|
|
'Mismatching spaces inside () in %s' % match.group(1))
|
|
if not len(match.group(2)) in [0, 1]:
|
|
error(filename, linenum, 'whitespace/parens', 5,
|
|
'Should have zero or one spaces inside ( and ) in %s' %
|
|
match.group(1))
|
|
|
|
# You should always have a space after a comma (either as fn arg or operator)
|
|
if Search(r',[^\s]', line):
|
|
error(filename, linenum, 'whitespace/comma', 3,
|
|
'Missing space after ,')
|
|
|
|
# You should always have a space after a semicolon
|
|
# except for few corner cases
|
|
# TODO(unknown): clarify if 'if (1) { return 1;}' is requires one more
|
|
# space after ;
|
|
if Search(r';[^\s};\\)/]', line):
|
|
error(filename, linenum, 'whitespace/semicolon', 3,
|
|
'Missing space after ;')
|
|
|
|
# Next we will look for issues with function calls.
|
|
CheckSpacingForFunctionCall(filename, line, linenum, error)
|
|
|
|
# Except after an opening paren, or after another opening brace (in case of
|
|
# an initializer list, for instance), 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, linenum, 'whitespace/braces', 5,
|
|
'Missing space before {')
|
|
|
|
# Make sure '} else {' has spaces.
|
|
if Search(r'}else', line):
|
|
error(filename, linenum, '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, linenum, '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*$', line):
|
|
error(filename, linenum, 'whitespace/semicolon', 5,
|
|
'Semicolon defining empty statement. Use { } instead.')
|
|
elif Search(r'^\s*;\s*$', line):
|
|
error(filename, linenum, '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, linenum, 'whitespace/semicolon', 5,
|
|
'Extra space before last semicolon. If this should be an empty '
|
|
'statement, use { } instead.')
|
|
|
|
|
|
def CheckSectionSpacing(filename, clean_lines, class_info, linenum, error):
|
|
"""Checks for additional blank line issues related to sections.
|
|
|
|
Currently the only thing checked here is blank line before protected/private.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
class_info: A _ClassInfo objects.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
# Skip checks if the class is small, where small means 25 lines or less.
|
|
# 25 lines seems like a good cutoff since that's the usual height of
|
|
# terminals, and any class that can't fit in one screen can't really
|
|
# be considered "small".
|
|
#
|
|
# Also skip checks if we are on the first line. This accounts for
|
|
# classes that look like
|
|
# class Foo { public: ... };
|
|
#
|
|
# If we didn't find the end of the class, last_line would be zero,
|
|
# and the check will be skipped by the first condition.
|
|
if (class_info.last_line - class_info.linenum <= 24 or
|
|
linenum <= class_info.linenum):
|
|
return
|
|
|
|
matched = Match(r'\s*(public|protected|private):', clean_lines.lines[linenum])
|
|
if matched:
|
|
# Issue warning if the line before public/protected/private was
|
|
# not a blank line, but don't do this if the previous line contains
|
|
# "class" or "struct". This can happen two ways:
|
|
# - We are at the beginning of the class.
|
|
# - We are forward-declaring an inner class that is semantically
|
|
# private, but needed to be public for implementation reasons.
|
|
prev_line = clean_lines.lines[linenum - 1]
|
|
if (not IsBlankLine(prev_line) and
|
|
not Search(r'\b(class|struct)\b', prev_line)):
|
|
# Try a bit harder to find the beginning of the class. This is to
|
|
# account for multi-line base-specifier lists, e.g.:
|
|
# class Derived
|
|
# : public Base {
|
|
end_class_head = class_info.linenum
|
|
for i in range(class_info.linenum, linenum):
|
|
if Search(r'\{\s*$', clean_lines.lines[i]):
|
|
end_class_head = i
|
|
break
|
|
if end_class_head < linenum - 1:
|
|
error(filename, linenum, 'whitespace/blank_line', 3,
|
|
'"%s:" should be preceded by a blank line' % matched.group(1))
|
|
|
|
|
|
def GetPreviousNonBlankLine(clean_lines, linenum):
|
|
"""Return the most recent non-blank line and its line number.
|
|
|
|
Args:
|
|
clean_lines: A CleansedLines instance containing the file contents.
|
|
linenum: 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.
|
|
"""
|
|
|
|
prevlinenum = linenum - 1
|
|
while prevlinenum >= 0:
|
|
prevline = clean_lines.elided[prevlinenum]
|
|
if not IsBlankLine(prevline): # if not a blank line...
|
|
return (prevline, prevlinenum)
|
|
prevlinenum -= 1
|
|
return ('', -1)
|
|
|
|
|
|
def CheckBraces(filename, clean_lines, linenum, 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.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
|
|
line = clean_lines.elided[linenum] # get rid of comments and strings
|
|
|
|
if Match(r'\s*{\s*$', line):
|
|
# We allow an open brace to start a line in the case where someone
|
|
# is using braces in a block to explicitly create a new scope,
|
|
# which is commonly used to control the lifetime of
|
|
# stack-allocated variables. We don't detect this perfectly: we
|
|
# just don't complain if the last non-whitespace character on the
|
|
# previous non-blank line is ';', ':', '{', or '}'.
|
|
prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0]
|
|
if not Search(r'[;:}{]\s*$', prevline):
|
|
error(filename, linenum, 'whitespace/braces', 4,
|
|
'{ should almost always be at the end of the previous line')
|
|
|
|
# An else clause should be on the same line as the preceding closing brace.
|
|
if Match(r'\s*else\s*', line):
|
|
prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0]
|
|
if Match(r'\s*}\s*$', prevline):
|
|
error(filename, linenum, 'whitespace/newline', 4,
|
|
'An else should appear on the same line as the preceding }')
|
|
|
|
# If braces come on one side of an else, they should be on both.
|
|
# However, we have to worry about "else if" that spans multiple lines!
|
|
if Search(r'}\s*else[^{]*$', line) or Match(r'[^}]*else\s*{', line):
|
|
if Search(r'}\s*else if([^{]*)$', line): # could be multi-line if
|
|
# find the ( after the if
|
|
pos = line.find('else if')
|
|
pos = line.find('(', pos)
|
|
if pos > 0:
|
|
(endline, _, endpos) = CloseExpression(clean_lines, linenum, pos)
|
|
if endline[endpos:].find('{') == -1: # must be brace after if
|
|
error(filename, linenum, 'readability/braces', 5,
|
|
'If an else has a brace on one side, it should have it on both')
|
|
else: # common case: else not followed by a multi-line if
|
|
error(filename, linenum, 'readability/braces', 5,
|
|
'If an else has a brace on one side, it should have it on both')
|
|
|
|
# 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, linenum, '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, linenum, '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.
|
|
prevlinenum = linenum
|
|
while True:
|
|
(prevline, prevlinenum) = GetPreviousNonBlankLine(clean_lines, prevlinenum)
|
|
if Match(r'\s+{.*}\s*;', line) and not prevline.count(';'):
|
|
line = prevline + 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, linenum, 'readability/braces', 4,
|
|
"You don't need a ; after a }")
|
|
|
|
|
|
def ReplaceableCheck(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 CheckCheck(filename, clean_lines, linenum, 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.
|
|
linenum: 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[linenum].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[linenum] # get rid of comments and strings
|
|
|
|
# Encourage replacing plain CHECKs with CHECK_EQ/CHECK_NE/etc.
|
|
for operator in ['==', '!=', '>=', '>', '<=', '<']:
|
|
if ReplaceableCheck(operator, current_macro, line):
|
|
error(filename, linenum, 'readability/check', 2,
|
|
'Consider using %s instead of %s(a %s b)' % (
|
|
_CHECK_REPLACEMENT[current_macro][operator],
|
|
current_macro, operator))
|
|
break
|
|
|
|
|
|
def GetLineWidth(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 uc in unicodedata.normalize('NFC', line):
|
|
if unicodedata.east_asian_width(uc) in ('W', 'F'):
|
|
width += 2
|
|
elif not unicodedata.combining(uc):
|
|
width += 1
|
|
return width
|
|
else:
|
|
return len(line)
|
|
|
|
|
|
def CheckStyle(filename, clean_lines, linenum, file_extension, class_state,
|
|
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 2-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.
|
|
linenum: 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[linenum]
|
|
|
|
if line.find('\t') != -1:
|
|
error(filename, linenum, '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 2-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($0, " <<")) complain = 0;
|
|
# if(match(prev, " +for \\(")) complain = 0;
|
|
# if(prevodd && match(prevprev, " +for \\(")) complain = 0;
|
|
initial_spaces = 0
|
|
cleansed_line = clean_lines.elided[linenum]
|
|
while initial_spaces < len(line) and line[initial_spaces] == ' ':
|
|
initial_spaces += 1
|
|
if line and line[-1].isspace():
|
|
error(filename, linenum, 'whitespace/end_of_line', 4,
|
|
'Line ends in whitespace. Consider deleting these extra spaces.')
|
|
# There are certain situations we allow one space, notably for labels
|
|
elif ((initial_spaces == 1 or initial_spaces == 3) and
|
|
not Match(r'\s*\w+\s*:\s*$', cleansed_line)):
|
|
error(filename, linenum, 'whitespace/indent', 3,
|
|
'Weird number of spaces at line-start. '
|
|
'Are you using a 2-space indent?')
|
|
# Labels should always be indented at least one space.
|
|
elif not initial_spaces and line[:2] != '//' and Search(r'[^:]:\s*$',
|
|
line):
|
|
error(filename, linenum, 'whitespace/labels', 4,
|
|
'Labels should always be indented at least one space. '
|
|
'If this is a member-initializer list in a constructor or '
|
|
'the base class list in a class definition, the colon should '
|
|
'be on the following line.')
|
|
|
|
|
|
# Check if the line is a header guard.
|
|
is_header_guard = False
|
|
if file_extension == 'h':
|
|
cppvar = GetHeaderGuardCPPVariable(filename)
|
|
if (line.startswith('#ifndef %s' % cppvar) or
|
|
line.startswith('#define %s' % cppvar) or
|
|
line.startswith('#endif // %s' % cppvar)):
|
|
is_header_guard = True
|
|
# #include lines and header guards can be long, since there's no clean way to
|
|
# split them.
|
|
#
|
|
# URLs can be long too. It's possible to split these, but it makes them
|
|
# harder to cut&paste.
|
|
#
|
|
# The "$Id:...$" comment may also get very long without it being the
|
|
# developers fault.
|
|
if (not line.startswith('#include') and not is_header_guard and
|
|
not Match(r'^\s*//.*http(s?)://\S*$', line) and
|
|
not Match(r'^// \$Id:.*#[0-9]+ \$$', line)):
|
|
line_width = GetLineWidth(line)
|
|
if line_width > 100:
|
|
error(filename, linenum, 'whitespace/line_length', 4,
|
|
'Lines should very rarely be longer than 100 characters')
|
|
elif line_width > 80:
|
|
error(filename, linenum, 'whitespace/line_length', 2,
|
|
'Lines should be <= 80 characters long')
|
|
|
|
if (cleansed_line.count(';') > 1 and
|
|
# for loops are allowed two ;'s (and may run over two lines).
|
|
cleansed_line.find('for') == -1 and
|
|
(GetPreviousNonBlankLine(clean_lines, linenum)[0].find('for') == -1 or
|
|
GetPreviousNonBlankLine(clean_lines, linenum)[0].find(';') != -1) and
|
|
# It's ok to have many commands in a switch case that fits in 1 line
|
|
not ((cleansed_line.find('case ') != -1 or
|
|
cleansed_line.find('default:') != -1) and
|
|
cleansed_line.find('break;') != -1)):
|
|
error(filename, linenum, 'whitespace/newline', 4,
|
|
'More than one command on the same line')
|
|
|
|
# Some more style checks
|
|
CheckBraces(filename, clean_lines, linenum, error)
|
|
CheckSpacing(filename, clean_lines, linenum, error)
|
|
CheckCheck(filename, clean_lines, linenum, error)
|
|
if class_state and class_state.classinfo_stack:
|
|
CheckSectionSpacing(filename, clean_lines,
|
|
class_state.classinfo_stack[-1], linenum, error)
|
|
|
|
|
|
_RE_PATTERN_INCLUDE_NEW_STYLE = re.compile(r'#include +"[^/]+\.h"')
|
|
_RE_PATTERN_INCLUDE = re.compile(r'^\s*#\s*include\s*([<"])([^>"]*)[>"].*$')
|
|
# Matches the first component of a filename delimited by -s and _s. That is:
|
|
# _RE_FIRST_COMPONENT.match('foo').group(0) == 'foo'
|
|
# _RE_FIRST_COMPONENT.match('foo.cc').group(0) == 'foo'
|
|
# _RE_FIRST_COMPONENT.match('foo-bar_baz.cc').group(0) == 'foo'
|
|
# _RE_FIRST_COMPONENT.match('foo_bar-baz.cc').group(0) == 'foo'
|
|
_RE_FIRST_COMPONENT = re.compile(r'^[^-_.]+')
|
|
|
|
|
|
def _DropCommonSuffixes(filename):
|
|
"""Drops common suffixes like _test.cc or -inl.h from filename.
|
|
|
|
For example:
|
|
>>> _DropCommonSuffixes('foo/foo-inl.h')
|
|
'foo/foo'
|
|
>>> _DropCommonSuffixes('foo/bar/foo.cc')
|
|
'foo/bar/foo'
|
|
>>> _DropCommonSuffixes('foo/foo_internal.h')
|
|
'foo/foo'
|
|
>>> _DropCommonSuffixes('foo/foo_unusualinternal.h')
|
|
'foo/foo_unusualinternal'
|
|
|
|
Args:
|
|
filename: The input filename.
|
|
|
|
Returns:
|
|
The filename with the common suffix removed.
|
|
"""
|
|
for suffix in ('test.cc', 'regtest.cc', 'unittest.cc',
|
|
'inl.h', 'impl.h', 'internal.h'):
|
|
if (filename.endswith(suffix) and len(filename) > len(suffix) and
|
|
filename[-len(suffix) - 1] in ('-', '_')):
|
|
return filename[:-len(suffix) - 1]
|
|
return os.path.splitext(filename)[0]
|
|
|
|
|
|
def _IsTestFilename(filename):
|
|
"""Determines if the given filename has a suffix that identifies it as a test.
|
|
|
|
Args:
|
|
filename: The input filename.
|
|
|
|
Returns:
|
|
True if 'filename' looks like a test, False otherwise.
|
|
"""
|
|
if (filename.endswith('_test.cc') or
|
|
filename.endswith('_unittest.cc') or
|
|
filename.endswith('_regtest.cc')):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
|
|
def _ClassifyInclude(fileinfo, include, is_system):
|
|
"""Figures out what kind of header 'include' is.
|
|
|
|
Args:
|
|
fileinfo: The current file cpplint is running over. A FileInfo instance.
|
|
include: The path to a #included file.
|
|
is_system: True if the #include used <> rather than "".
|
|
|
|
Returns:
|
|
One of the _XXX_HEADER constants.
|
|
|
|
For example:
|
|
>>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'stdio.h', True)
|
|
_C_SYS_HEADER
|
|
>>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'string', True)
|
|
_CPP_SYS_HEADER
|
|
>>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'foo/foo.h', False)
|
|
_LIKELY_MY_HEADER
|
|
>>> _ClassifyInclude(FileInfo('foo/foo_unknown_extension.cc'),
|
|
... 'bar/foo_other_ext.h', False)
|
|
_POSSIBLE_MY_HEADER
|
|
>>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'foo/bar.h', False)
|
|
_OTHER_HEADER
|
|
"""
|
|
# This is a list of all standard c++ header files, except
|
|
# those already checked for above.
|
|
is_stl_h = include in _STL_HEADERS
|
|
is_cpp_h = is_stl_h or include in _CPP_HEADERS
|
|
|
|
if is_system:
|
|
if is_cpp_h:
|
|
return _CPP_SYS_HEADER
|
|
else:
|
|
return _C_SYS_HEADER
|
|
|
|
# If the target file and the include we're checking share a
|
|
# basename when we drop common extensions, and the include
|
|
# lives in . , then it's likely to be owned by the target file.
|
|
target_dir, target_base = (
|
|
os.path.split(_DropCommonSuffixes(fileinfo.RepositoryName())))
|
|
include_dir, include_base = os.path.split(_DropCommonSuffixes(include))
|
|
if target_base == include_base and (
|
|
include_dir == target_dir or
|
|
include_dir == os.path.normpath(target_dir + '/../public')):
|
|
return _LIKELY_MY_HEADER
|
|
|
|
# If the target and include share some initial basename
|
|
# component, it's possible the target is implementing the
|
|
# include, so it's allowed to be first, but we'll never
|
|
# complain if it's not there.
|
|
target_first_component = _RE_FIRST_COMPONENT.match(target_base)
|
|
include_first_component = _RE_FIRST_COMPONENT.match(include_base)
|
|
if (target_first_component and include_first_component and
|
|
target_first_component.group(0) ==
|
|
include_first_component.group(0)):
|
|
return _POSSIBLE_MY_HEADER
|
|
|
|
return _OTHER_HEADER
|
|
|
|
|
|
|
|
def CheckIncludeLine(filename, clean_lines, linenum, include_state, error):
|
|
"""Check rules that are applicable to #include lines.
|
|
|
|
Strings on #include lines are NOT removed from elided line, to make
|
|
certain tasks easier. However, to prevent false positives, checks
|
|
applicable to #include lines in CheckLanguage must be put here.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
include_state: An _IncludeState instance in which the headers are inserted.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
fileinfo = FileInfo(filename)
|
|
|
|
line = clean_lines.lines[linenum]
|
|
|
|
# "include" should use the new style "foo/bar.h" instead of just "bar.h"
|
|
if _RE_PATTERN_INCLUDE_NEW_STYLE.search(line):
|
|
error(filename, linenum, 'build/include', 4,
|
|
'Include the directory when naming .h files')
|
|
|
|
# we shouldn't include a file more than once. actually, there are a
|
|
# handful of instances where doing so is okay, but in general it's
|
|
# not.
|
|
match = _RE_PATTERN_INCLUDE.search(line)
|
|
if match:
|
|
include = match.group(2)
|
|
is_system = (match.group(1) == '<')
|
|
if include in include_state:
|
|
error(filename, linenum, 'build/include', 4,
|
|
'"%s" already included at %s:%s' %
|
|
(include, filename, include_state[include]))
|
|
else:
|
|
include_state[include] = linenum
|
|
|
|
# We want to ensure that headers appear in the right order:
|
|
# 1) for foo.cc, foo.h (preferred location)
|
|
# 2) c system files
|
|
# 3) cpp system files
|
|
# 4) for foo.cc, foo.h (deprecated location)
|
|
# 5) other google headers
|
|
#
|
|
# We classify each include statement as one of those 5 types
|
|
# using a number of techniques. The include_state object keeps
|
|
# track of the highest type seen, and complains if we see a
|
|
# lower type after that.
|
|
error_message = include_state.CheckNextIncludeOrder(
|
|
_ClassifyInclude(fileinfo, include, is_system))
|
|
if error_message:
|
|
error(filename, linenum, 'build/include_order', 4,
|
|
'%s. Should be: %s.h, c system, c++ system, other.' %
|
|
(error_message, fileinfo.BaseName()))
|
|
if not include_state.IsInAlphabeticalOrder(include):
|
|
error(filename, linenum, 'build/include_alpha', 4,
|
|
'Include "%s" not in alphabetical order' % include)
|
|
|
|
# Look for any of the stream classes that are part of standard C++.
|
|
match = _RE_PATTERN_INCLUDE.match(line)
|
|
if match:
|
|
include = match.group(2)
|
|
if Match(r'(f|ind|io|i|o|parse|pf|stdio|str|)?stream$', include):
|
|
# Many unit tests use cout, so we exempt them.
|
|
if not _IsTestFilename(filename):
|
|
error(filename, linenum, 'readability/streams', 3,
|
|
'Streams are highly discouraged.')
|
|
|
|
|
|
def _GetTextInside(text, start_pattern):
|
|
"""Retrieves all the text between matching open and close parentheses.
|
|
|
|
Given a string of lines and a regular expression string, retrieve all the text
|
|
following the expression and between opening punctuation symbols like
|
|
(, [, or {, and the matching close-punctuation symbol. This properly nested
|
|
occurrences of the punctuations, so for the text like
|
|
printf(a(), b(c()));
|
|
a call to _GetTextInside(text, r'printf\(') will return 'a(), b(c())'.
|
|
start_pattern must match string having an open punctuation symbol at the end.
|
|
|
|
Args:
|
|
text: The lines to extract text. Its comments and strings must be elided.
|
|
It can be single line and can span multiple lines.
|
|
start_pattern: The regexp string indicating where to start extracting
|
|
the text.
|
|
Returns:
|
|
The extracted text.
|
|
None if either the opening string or ending punctuation could not be found.
|
|
"""
|
|
# TODO(sugawarayu): Audit cpplint.py to see what places could be profitably
|
|
# rewritten to use _GetTextInside (and use inferior regexp matching today).
|
|
|
|
# Give opening punctuations to get the matching close-punctuations.
|
|
matching_punctuation = {'(': ')', '{': '}', '[': ']'}
|
|
closing_punctuation = set(matching_punctuation.itervalues())
|
|
|
|
# Find the position to start extracting text.
|
|
match = re.search(start_pattern, text, re.M)
|
|
if not match: # start_pattern not found in text.
|
|
return None
|
|
start_position = match.end(0)
|
|
|
|
assert start_position > 0, (
|
|
'start_pattern must ends with an opening punctuation.')
|
|
assert text[start_position - 1] in matching_punctuation, (
|
|
'start_pattern must ends with an opening punctuation.')
|
|
# Stack of closing punctuations we expect to have in text after position.
|
|
punctuation_stack = [matching_punctuation[text[start_position - 1]]]
|
|
position = start_position
|
|
while punctuation_stack and position < len(text):
|
|
if text[position] == punctuation_stack[-1]:
|
|
punctuation_stack.pop()
|
|
elif text[position] in closing_punctuation:
|
|
# A closing punctuation without matching opening punctuations.
|
|
return None
|
|
elif text[position] in matching_punctuation:
|
|
punctuation_stack.append(matching_punctuation[text[position]])
|
|
position += 1
|
|
if punctuation_stack:
|
|
# Opening punctuations left without matching close-punctuations.
|
|
return None
|
|
# punctuations match.
|
|
return text[start_position:position - 1]
|
|
|
|
|
|
def CheckLanguage(filename, clean_lines, linenum, file_extension, include_state,
|
|
error):
|
|
"""Checks rules from the 'C++ language rules' section of cppguide.html.
|
|
|
|
Some of these rules are hard to test (function overloading, using
|
|
uint32 inappropriately), but we do the best we can.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
file_extension: The extension (without the dot) of the filename.
|
|
include_state: An _IncludeState instance in which the headers are inserted.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
# If the line is empty or consists of entirely a comment, no need to
|
|
# check it.
|
|
line = clean_lines.elided[linenum]
|
|
if not line:
|
|
return
|
|
|
|
match = _RE_PATTERN_INCLUDE.search(line)
|
|
if match:
|
|
CheckIncludeLine(filename, clean_lines, linenum, include_state, error)
|
|
return
|
|
|
|
# Create an extended_line, which is the concatenation of the current and
|
|
# next lines, for more effective checking of code that may span more than one
|
|
# line.
|
|
if linenum + 1 < clean_lines.NumLines():
|
|
extended_line = line + clean_lines.elided[linenum + 1]
|
|
else:
|
|
extended_line = line
|
|
|
|
# Make Windows paths like Unix.
|
|
fullname = os.path.abspath(filename).replace('\\', '/')
|
|
|
|
# TODO(unknown): figure out if they're using default arguments in fn proto.
|
|
|
|
# Check for non-const references in functions. This is tricky because &
|
|
# is also used to take the address of something. We allow <> for templates,
|
|
# (ignoring whatever is between the braces) and : for classes.
|
|
# These are complicated re's. They try to capture the following:
|
|
# paren (for fn-prototype start), typename, &, varname. For the const
|
|
# version, we're willing for const to be before typename or after
|
|
# Don't check the implementation on same line.
|
|
fnline = line.split('{', 1)[0]
|
|
if (len(re.findall(r'\([^()]*\b(?:[\w:]|<[^()]*>)+(\s?&|&\s?)\w+', fnline)) >
|
|
len(re.findall(r'\([^()]*\bconst\s+(?:typename\s+)?(?:struct\s+)?'
|
|
r'(?:[\w:]|<[^()]*>)+(\s?&|&\s?)\w+', fnline)) +
|
|
len(re.findall(r'\([^()]*\b(?:[\w:]|<[^()]*>)+\s+const(\s?&|&\s?)[\w]+',
|
|
fnline))):
|
|
|
|
# We allow non-const references in a few standard places, like functions
|
|
# called "swap()" or iostream operators like "<<" or ">>".
|
|
if not Search(
|
|
r'(swap|Swap|operator[<>][<>])\s*\(\s*(?:[\w:]|<.*>)+\s*&',
|
|
fnline):
|
|
error(filename, linenum, 'runtime/references', 2,
|
|
'Is this a non-const reference? '
|
|
'If so, make const or use a pointer.')
|
|
|
|
# Check to see if they're using an conversion function cast.
|
|
# I just try to capture the most common basic types, though there are more.
|
|
# Parameterless conversion functions, such as bool(), are allowed as they are
|
|
# probably a member operator declaration or default constructor.
|
|
match = Search(
|
|
r'(\bnew\s+)?\b' # Grab 'new' operator, if it's there
|
|
r'(int|float|double|bool|char|int32|uint32|int64|uint64)\([^)]', line)
|
|
if match:
|
|
# gMock methods are defined using some variant of MOCK_METHODx(name, type)
|
|
# where type may be float(), int(string), etc. Without context they are
|
|
# virtually indistinguishable from int(x) casts. Likewise, gMock's
|
|
# MockCallback takes a template parameter of the form return_type(arg_type),
|
|
# which looks much like the cast we're trying to detect.
|
|
if (match.group(1) is None and # If new operator, then this isn't a cast
|
|
not (Match(r'^\s*MOCK_(CONST_)?METHOD\d+(_T)?\(', line) or
|
|
Match(r'^\s*MockCallback<.*>', line))):
|
|
error(filename, linenum, 'readability/casting', 4,
|
|
'Using deprecated casting style. '
|
|
'Use static_cast<%s>(...) instead' %
|
|
match.group(2))
|
|
|
|
CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum],
|
|
'static_cast',
|
|
r'\((int|float|double|bool|char|u?int(16|32|64))\)', error)
|
|
|
|
# This doesn't catch all cases. Consider (const char * const)"hello".
|
|
#
|
|
# (char *) "foo" should always be a const_cast (reinterpret_cast won't
|
|
# compile).
|
|
if CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum],
|
|
'const_cast', r'\((char\s?\*+\s?)\)\s*"', error):
|
|
pass
|
|
else:
|
|
# Check pointer casts for other than string constants
|
|
CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum],
|
|
'reinterpret_cast', r'\((\w+\s?\*+\s?)\)', error)
|
|
|
|
# In addition, we look for people taking the address of a cast. This
|
|
# is dangerous -- casts can assign to temporaries, so the pointer doesn't
|
|
# point where you think.
|
|
if Search(
|
|
r'(&\([^)]+\)[\w(])|(&(static|dynamic|reinterpret)_cast\b)', line):
|
|
error(filename, linenum, 'runtime/casting', 4,
|
|
('Are you taking an address of a cast? '
|
|
'This is dangerous: could be a temp var. '
|
|
'Take the address before doing the cast, rather than after'))
|
|
|
|
# Check for people declaring static/global STL strings at the top level.
|
|
# This is dangerous because the C++ language does not guarantee that
|
|
# globals with constructors are initialized before the first access.
|
|
match = Match(
|
|
r'((?:|static +)(?:|const +))string +([a-zA-Z0-9_:]+)\b(.*)',
|
|
line)
|
|
# Make sure it's not a function.
|
|
# Function template specialization looks like: "string foo<Type>(...".
|
|
# Class template definitions look like: "string Foo<Type>::Method(...".
|
|
if match and not Match(r'\s*(<.*>)?(::[a-zA-Z0-9_]+)?\s*\(([^"]|$)',
|
|
match.group(3)):
|
|
error(filename, linenum, 'runtime/string', 4,
|
|
'For a static/global string constant, use a C style string instead: '
|
|
'"%schar %s[]".' %
|
|
(match.group(1), match.group(2)))
|
|
|
|
# Check that we're not using RTTI outside of testing code.
|
|
if Search(r'\bdynamic_cast<', line) and not _IsTestFilename(filename):
|
|
error(filename, linenum, 'runtime/rtti', 5,
|
|
'Do not use dynamic_cast<>. If you need to cast within a class '
|
|
"hierarchy, use static_cast<> to upcast. Google doesn't support "
|
|
'RTTI.')
|
|
|
|
if Search(r'\b([A-Za-z0-9_]*_)\(\1\)', line):
|
|
error(filename, linenum, 'runtime/init', 4,
|
|
'You seem to be initializing a member variable with itself.')
|
|
|
|
if file_extension == 'h':
|
|
# TODO(unknown): check that 1-arg constructors are explicit.
|
|
# How to tell it's a constructor?
|
|
# (handled in CheckForNonStandardConstructs for now)
|
|
# TODO(unknown): check that classes have DISALLOW_EVIL_CONSTRUCTORS
|
|
# (level 1 error)
|
|
pass
|
|
|
|
# Check if people are using the verboten C basic types. The only exception
|
|
# we regularly allow is "unsigned short port" for port.
|
|
if Search(r'\bshort port\b', line):
|
|
if not Search(r'\bunsigned short port\b', line):
|
|
error(filename, linenum, 'runtime/int', 4,
|
|
'Use "unsigned short" for ports, not "short"')
|
|
else:
|
|
match = Search(r'\b(short|long(?! +double)|long long)\b', line)
|
|
if match:
|
|
error(filename, linenum, 'runtime/int', 4,
|
|
'Use int16/int64/etc, rather than the C type %s' % match.group(1))
|
|
|
|
# When snprintf is used, the second argument shouldn't be a literal.
|
|
match = Search(r'snprintf\s*\(([^,]*),\s*([0-9]*)\s*,', line)
|
|
if match and match.group(2) != '0':
|
|
# If 2nd arg is zero, snprintf is used to calculate size.
|
|
error(filename, linenum, 'runtime/printf', 3,
|
|
'If you can, use sizeof(%s) instead of %s as the 2nd arg '
|
|
'to snprintf.' % (match.group(1), match.group(2)))
|
|
|
|
# Check if some verboten C functions are being used.
|
|
if Search(r'\bsprintf\b', line):
|
|
error(filename, linenum, 'runtime/printf', 5,
|
|
'Never use sprintf. Use snprintf instead.')
|
|
match = Search(r'\b(strcpy|strcat)\b', line)
|
|
if match:
|
|
error(filename, linenum, 'runtime/printf', 4,
|
|
'Almost always, snprintf is better than %s' % match.group(1))
|
|
|
|
if Search(r'\bsscanf\b', line):
|
|
error(filename, linenum, 'runtime/printf', 1,
|
|
'sscanf can be ok, but is slow and can overflow buffers.')
|
|
|
|
# Check if some verboten operator overloading is going on
|
|
# TODO(unknown): catch out-of-line unary operator&:
|
|
# class X {};
|
|
# int operator&(const X& x) { return 42; } // unary operator&
|
|
# The trick is it's hard to tell apart from binary operator&:
|
|
# class Y { int operator&(const Y& x) { return 23; } }; // binary operator&
|
|
if Search(r'\boperator\s*&\s*\(\s*\)', line):
|
|
error(filename, linenum, 'runtime/operator', 4,
|
|
'Unary operator& is dangerous. Do not use it.')
|
|
|
|
# Check for suspicious usage of "if" like
|
|
# } if (a == b) {
|
|
if Search(r'\}\s*if\s*\(', line):
|
|
error(filename, linenum, 'readability/braces', 4,
|
|
'Did you mean "else if"? If not, start a new line for "if".')
|
|
|
|
# Check for potential format string bugs like printf(foo).
|
|
# We constrain the pattern not to pick things like DocidForPrintf(foo).
|
|
# Not perfect but it can catch printf(foo.c_str()) and printf(foo->c_str())
|
|
# TODO(sugawarayu): Catch the following case. Need to change the calling
|
|
# convention of the whole function to process multiple line to handle it.
|
|
# printf(
|
|
# boy_this_is_a_really_long_variable_that_cannot_fit_on_the_prev_line);
|
|
printf_args = _GetTextInside(line, r'(?i)\b(string)?printf\s*\(')
|
|
if printf_args:
|
|
match = Match(r'([\w.\->()]+)$', printf_args)
|
|
if match:
|
|
function_name = re.search(r'\b((?:string)?printf)\s*\(',
|
|
line, re.I).group(1)
|
|
error(filename, linenum, 'runtime/printf', 4,
|
|
'Potential format string bug. Do %s("%%s", %s) instead.'
|
|
% (function_name, match.group(1)))
|
|
|
|
# Check for potential memset bugs like memset(buf, sizeof(buf), 0).
|
|
match = Search(r'memset\s*\(([^,]*),\s*([^,]*),\s*0\s*\)', line)
|
|
if match and not Match(r"^''|-?[0-9]+|0x[0-9A-Fa-f]$", match.group(2)):
|
|
error(filename, linenum, 'runtime/memset', 4,
|
|
'Did you mean "memset(%s, 0, %s)"?'
|
|
% (match.group(1), match.group(2)))
|
|
|
|
if Search(r'\busing namespace\b', line):
|
|
error(filename, linenum, 'build/namespaces', 5,
|
|
'Do not use namespace using-directives. '
|
|
'Use using-declarations instead.')
|
|
|
|
# Detect variable-length arrays.
|
|
match = Match(r'\s*(.+::)?(\w+) [a-z]\w*\[(.+)];', line)
|
|
if (match and match.group(2) != 'return' and match.group(2) != 'delete' and
|
|
match.group(3).find(']') == -1):
|
|
# Split the size using space and arithmetic operators as delimiters.
|
|
# If any of the resulting tokens are not compile time constants then
|
|
# report the error.
|
|
tokens = re.split(r'\s|\+|\-|\*|\/|<<|>>]', match.group(3))
|
|
is_const = True
|
|
skip_next = False
|
|
for tok in tokens:
|
|
if skip_next:
|
|
skip_next = False
|
|
continue
|
|
|
|
if Search(r'sizeof\(.+\)', tok): continue
|
|
if Search(r'arraysize\(\w+\)', tok): continue
|
|
|
|
tok = tok.lstrip('(')
|
|
tok = tok.rstrip(')')
|
|
if not tok: continue
|
|
if Match(r'\d+', tok): continue
|
|
if Match(r'0[xX][0-9a-fA-F]+', tok): continue
|
|
if Match(r'k[A-Z0-9]\w*', tok): continue
|
|
if Match(r'(.+::)?k[A-Z0-9]\w*', tok): continue
|
|
if Match(r'(.+::)?[A-Z][A-Z0-9_]*', tok): continue
|
|
# A catch all for tricky sizeof cases, including 'sizeof expression',
|
|
# 'sizeof(*type)', 'sizeof(const type)', 'sizeof(struct StructName)'
|
|
# requires skipping the next token because we split on ' ' and '*'.
|
|
if tok.startswith('sizeof'):
|
|
skip_next = True
|
|
continue
|
|
is_const = False
|
|
break
|
|
if not is_const:
|
|
error(filename, linenum, 'runtime/arrays', 1,
|
|
'Do not use variable-length arrays. Use an appropriately named '
|
|
"('k' followed by CamelCase) compile-time constant for the size.")
|
|
|
|
# If DISALLOW_EVIL_CONSTRUCTORS, DISALLOW_COPY_AND_ASSIGN, or
|
|
# DISALLOW_IMPLICIT_CONSTRUCTORS is present, then it should be the last thing
|
|
# in the class declaration.
|
|
match = Match(
|
|
(r'\s*'
|
|
r'(DISALLOW_(EVIL_CONSTRUCTORS|COPY_AND_ASSIGN|IMPLICIT_CONSTRUCTORS))'
|
|
r'\(.*\);$'),
|
|
line)
|
|
if match and linenum + 1 < clean_lines.NumLines():
|
|
next_line = clean_lines.elided[linenum + 1]
|
|
# We allow some, but not all, declarations of variables to be present
|
|
# in the statement that defines the class. The [\w\*,\s]* fragment of
|
|
# the regular expression below allows users to declare instances of
|
|
# the class or pointers to instances, but not less common types such
|
|
# as function pointers or arrays. It's a tradeoff between allowing
|
|
# reasonable code and avoiding trying to parse more C++ using regexps.
|
|
if not Search(r'^\s*}[\w\*,\s]*;', next_line):
|
|
error(filename, linenum, 'readability/constructors', 3,
|
|
match.group(1) + ' should be the last thing in the class')
|
|
|
|
# Check for use of unnamed namespaces in header files. Registration
|
|
# macros are typically OK, so we allow use of "namespace {" on lines
|
|
# that end with backslashes.
|
|
if (file_extension == 'h'
|
|
and Search(r'\bnamespace\s*{', line)
|
|
and line[-1] != '\\'):
|
|
error(filename, linenum, 'build/namespaces', 4,
|
|
'Do not use unnamed namespaces in header files. See '
|
|
'http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Namespaces'
|
|
' for more information.')
|
|
|
|
|
|
def CheckCStyleCast(filename, linenum, line, raw_line, cast_type, pattern,
|
|
error):
|
|
"""Checks for a C-style cast by looking for the pattern.
|
|
|
|
This also handles sizeof(type) warnings, due to similarity of content.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
linenum: The number of the line to check.
|
|
line: The line of code to check.
|
|
raw_line: The raw line of code to check, with comments.
|
|
cast_type: The string for the C++ cast to recommend. This is either
|
|
reinterpret_cast, static_cast, or const_cast, depending.
|
|
pattern: The regular expression used to find C-style casts.
|
|
error: The function to call with any errors found.
|
|
|
|
Returns:
|
|
True if an error was emitted.
|
|
False otherwise.
|
|
"""
|
|
match = Search(pattern, line)
|
|
if not match:
|
|
return False
|
|
|
|
# e.g., sizeof(int)
|
|
sizeof_match = Match(r'.*sizeof\s*$', line[0:match.start(1) - 1])
|
|
if sizeof_match:
|
|
error(filename, linenum, 'runtime/sizeof', 1,
|
|
'Using sizeof(type). Use sizeof(varname) instead if possible')
|
|
return True
|
|
|
|
remainder = line[match.end(0):]
|
|
|
|
# The close paren is for function pointers as arguments to a function.
|
|
# eg, void foo(void (*bar)(int));
|
|
# The semicolon check is a more basic function check; also possibly a
|
|
# function pointer typedef.
|
|
# eg, void foo(int); or void foo(int) const;
|
|
# The equals check is for function pointer assignment.
|
|
# eg, void *(*foo)(int) = ...
|
|
# The > is for MockCallback<...> ...
|
|
#
|
|
# Right now, this will only catch cases where there's a single argument, and
|
|
# it's unnamed. It should probably be expanded to check for multiple
|
|
# arguments with some unnamed.
|
|
function_match = Match(r'\s*(\)|=|(const)?\s*(;|\{|throw\(\)|>))', remainder)
|
|
if function_match:
|
|
if (not function_match.group(3) or
|
|
function_match.group(3) == ';' or
|
|
('MockCallback<' not in raw_line and
|
|
'/*' not in raw_line)):
|
|
error(filename, linenum, 'readability/function', 3,
|
|
'All parameters should be named in a function')
|
|
return True
|
|
|
|
# At this point, all that should be left is actual casts.
|
|
error(filename, linenum, 'readability/casting', 4,
|
|
'Using C-style cast. Use %s<%s>(...) instead' %
|
|
(cast_type, match.group(1)))
|
|
|
|
return True
|
|
|
|
|
|
_HEADERS_CONTAINING_TEMPLATES = (
|
|
('<deque>', ('deque',)),
|
|
('<functional>', ('unary_function', 'binary_function',
|
|
'plus', 'minus', 'multiplies', 'divides', 'modulus',
|
|
'negate',
|
|
'equal_to', 'not_equal_to', 'greater', 'less',
|
|
'greater_equal', 'less_equal',
|
|
'logical_and', 'logical_or', 'logical_not',
|
|
'unary_negate', 'not1', 'binary_negate', 'not2',
|
|
'bind1st', 'bind2nd',
|
|
'pointer_to_unary_function',
|
|
'pointer_to_binary_function',
|
|
'ptr_fun',
|
|
'mem_fun_t', 'mem_fun', 'mem_fun1_t', 'mem_fun1_ref_t',
|
|
'mem_fun_ref_t',
|
|
'const_mem_fun_t', 'const_mem_fun1_t',
|
|
'const_mem_fun_ref_t', 'const_mem_fun1_ref_t',
|
|
'mem_fun_ref',
|
|
)),
|
|
('<limits>', ('numeric_limits',)),
|
|
('<list>', ('list',)),
|
|
('<map>', ('map', 'multimap',)),
|
|
('<memory>', ('allocator',)),
|
|
('<queue>', ('queue', 'priority_queue',)),
|
|
('<set>', ('set', 'multiset',)),
|
|
('<stack>', ('stack',)),
|
|
('<string>', ('char_traits', 'basic_string',)),
|
|
('<utility>', ('pair',)),
|
|
('<vector>', ('vector',)),
|
|
|
|
# gcc extensions.
|
|
# Note: std::hash is their hash, ::hash is our hash
|
|
('<hash_map>', ('hash_map', 'hash_multimap',)),
|
|
('<hash_set>', ('hash_set', 'hash_multiset',)),
|
|
('<slist>', ('slist',)),
|
|
)
|
|
|
|
_RE_PATTERN_STRING = re.compile(r'\bstring\b')
|
|
|
|
_re_pattern_algorithm_header = []
|
|
for _template in ('copy', 'max', 'min', 'min_element', 'sort', 'swap',
|
|
'transform'):
|
|
# Match max<type>(..., ...), max(..., ...), but not foo->max, foo.max or
|
|
# type::max().
|
|
_re_pattern_algorithm_header.append(
|
|
(re.compile(r'[^>.]\b' + _template + r'(<.*?>)?\([^\)]'),
|
|
_template,
|
|
'<algorithm>'))
|
|
|
|
_re_pattern_templates = []
|
|
for _header, _templates in _HEADERS_CONTAINING_TEMPLATES:
|
|
for _template in _templates:
|
|
_re_pattern_templates.append(
|
|
(re.compile(r'(\<|\b)' + _template + r'\s*\<'),
|
|
_template + '<>',
|
|
_header))
|
|
|
|
|
|
def FilesBelongToSameModule(filename_cc, filename_h):
|
|
"""Check if these two filenames belong to the same module.
|
|
|
|
The concept of a 'module' here is a as follows:
|
|
foo.h, foo-inl.h, foo.cc, foo_test.cc and foo_unittest.cc belong to the
|
|
same 'module' if they are in the same directory.
|
|
some/path/public/xyzzy and some/path/internal/xyzzy are also considered
|
|
to belong to the same module here.
|
|
|
|
If the filename_cc contains a longer path than the filename_h, for example,
|
|
'/absolute/path/to/base/sysinfo.cc', and this file would include
|
|
'base/sysinfo.h', this function also produces the prefix needed to open the
|
|
header. This is used by the caller of this function to more robustly open the
|
|
header file. We don't have access to the real include paths in this context,
|
|
so we need this guesswork here.
|
|
|
|
Known bugs: tools/base/bar.cc and base/bar.h belong to the same module
|
|
according to this implementation. Because of this, this function gives
|
|
some false positives. This should be sufficiently rare in practice.
|
|
|
|
Args:
|
|
filename_cc: is the path for the .cc file
|
|
filename_h: is the path for the header path
|
|
|
|
Returns:
|
|
Tuple with a bool and a string:
|
|
bool: True if filename_cc and filename_h belong to the same module.
|
|
string: the additional prefix needed to open the header file.
|
|
"""
|
|
|
|
if not filename_cc.endswith('.cc'):
|
|
return (False, '')
|
|
filename_cc = filename_cc[:-len('.cc')]
|
|
if filename_cc.endswith('_unittest'):
|
|
filename_cc = filename_cc[:-len('_unittest')]
|
|
elif filename_cc.endswith('_test'):
|
|
filename_cc = filename_cc[:-len('_test')]
|
|
filename_cc = filename_cc.replace('/public/', '/')
|
|
filename_cc = filename_cc.replace('/internal/', '/')
|
|
|
|
if not filename_h.endswith('.h'):
|
|
return (False, '')
|
|
filename_h = filename_h[:-len('.h')]
|
|
if filename_h.endswith('-inl'):
|
|
filename_h = filename_h[:-len('-inl')]
|
|
filename_h = filename_h.replace('/public/', '/')
|
|
filename_h = filename_h.replace('/internal/', '/')
|
|
|
|
files_belong_to_same_module = filename_cc.endswith(filename_h)
|
|
common_path = ''
|
|
if files_belong_to_same_module:
|
|
common_path = filename_cc[:-len(filename_h)]
|
|
return files_belong_to_same_module, common_path
|
|
|
|
|
|
def UpdateIncludeState(filename, include_state, io=codecs):
|
|
"""Fill up the include_state with new includes found from the file.
|
|
|
|
Args:
|
|
filename: the name of the header to read.
|
|
include_state: an _IncludeState instance in which the headers are inserted.
|
|
io: The io factory to use to read the file. Provided for testability.
|
|
|
|
Returns:
|
|
True if a header was succesfully added. False otherwise.
|
|
"""
|
|
headerfile = None
|
|
try:
|
|
headerfile = io.open(filename, 'r', 'utf8', 'replace')
|
|
except IOError:
|
|
return False
|
|
linenum = 0
|
|
for line in headerfile:
|
|
linenum += 1
|
|
clean_line = CleanseComments(line)
|
|
match = _RE_PATTERN_INCLUDE.search(clean_line)
|
|
if match:
|
|
include = match.group(2)
|
|
# The value formatting is cute, but not really used right now.
|
|
# What matters here is that the key is in include_state.
|
|
include_state.setdefault(include, '%s:%d' % (filename, linenum))
|
|
return True
|
|
|
|
|
|
def CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error,
|
|
io=codecs):
|
|
"""Reports for missing stl includes.
|
|
|
|
This function will output warnings to make sure you are including the headers
|
|
necessary for the stl containers and functions that you use. We only give one
|
|
reason to include a header. For example, if you use both equal_to<> and
|
|
less<> in a .h file, only one (the latter in the file) of these will be
|
|
reported as a reason to include the <functional>.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
include_state: An _IncludeState instance.
|
|
error: The function to call with any errors found.
|
|
io: The IO factory to use to read the header file. Provided for unittest
|
|
injection.
|
|
"""
|
|
required = {} # A map of header name to linenumber and the template entity.
|
|
# Example of required: { '<functional>': (1219, 'less<>') }
|
|
|
|
for linenum in xrange(clean_lines.NumLines()):
|
|
line = clean_lines.elided[linenum]
|
|
if not line or line[0] == '#':
|
|
continue
|
|
|
|
# String is special -- it is a non-templatized type in STL.
|
|
matched = _RE_PATTERN_STRING.search(line)
|
|
if matched:
|
|
# Don't warn about strings in non-STL namespaces:
|
|
# (We check only the first match per line; good enough.)
|
|
prefix = line[:matched.start()]
|
|
if prefix.endswith('std::') or not prefix.endswith('::'):
|
|
required['<string>'] = (linenum, 'string')
|
|
|
|
for pattern, template, header in _re_pattern_algorithm_header:
|
|
if pattern.search(line):
|
|
required[header] = (linenum, template)
|
|
|
|
# The following function is just a speed up, no semantics are changed.
|
|
if not '<' in line: # Reduces the cpu time usage by skipping lines.
|
|
continue
|
|
|
|
for pattern, template, header in _re_pattern_templates:
|
|
if pattern.search(line):
|
|
required[header] = (linenum, template)
|
|
|
|
# The policy is that if you #include something in foo.h you don't need to
|
|
# include it again in foo.cc. Here, we will look at possible includes.
|
|
# Let's copy the include_state so it is only messed up within this function.
|
|
include_state = include_state.copy()
|
|
|
|
# Did we find the header for this file (if any) and succesfully load it?
|
|
header_found = False
|
|
|
|
# Use the absolute path so that matching works properly.
|
|
abs_filename = FileInfo(filename).FullName()
|
|
|
|
# For Emacs's flymake.
|
|
# If cpplint is invoked from Emacs's flymake, a temporary file is generated
|
|
# by flymake and that file name might end with '_flymake.cc'. In that case,
|
|
# restore original file name here so that the corresponding header file can be
|
|
# found.
|
|
# e.g. If the file name is 'foo_flymake.cc', we should search for 'foo.h'
|
|
# instead of 'foo_flymake.h'
|
|
abs_filename = re.sub(r'_flymake\.cc$', '.cc', abs_filename)
|
|
|
|
# include_state is modified during iteration, so we iterate over a copy of
|
|
# the keys.
|
|
header_keys = include_state.keys()
|
|
for header in header_keys:
|
|
(same_module, common_path) = FilesBelongToSameModule(abs_filename, header)
|
|
fullpath = common_path + header
|
|
if same_module and UpdateIncludeState(fullpath, include_state, io):
|
|
header_found = True
|
|
|
|
# If we can't find the header file for a .cc, assume it's because we don't
|
|
# know where to look. In that case we'll give up as we're not sure they
|
|
# didn't include it in the .h file.
|
|
# TODO(unknown): Do a better job of finding .h files so we are confident that
|
|
# not having the .h file means there isn't one.
|
|
if filename.endswith('.cc') and not header_found:
|
|
return
|
|
|
|
# All the lines have been processed, report the errors found.
|
|
for required_header_unstripped in required:
|
|
template = required[required_header_unstripped][1]
|
|
if required_header_unstripped.strip('<>"') not in include_state:
|
|
error(filename, required[required_header_unstripped][0],
|
|
'build/include_what_you_use', 4,
|
|
'Add #include ' + required_header_unstripped + ' for ' + template)
|
|
|
|
|
|
_RE_PATTERN_EXPLICIT_MAKEPAIR = re.compile(r'\bmake_pair\s*<')
|
|
|
|
|
|
def CheckMakePairUsesDeduction(filename, clean_lines, linenum, error):
|
|
"""Check that make_pair's template arguments are deduced.
|
|
|
|
G++ 4.6 in C++0x mode fails badly if make_pair's template arguments are
|
|
specified explicitly, and such use isn't intended in any case.
|
|
|
|
Args:
|
|
filename: The name of the current file.
|
|
clean_lines: A CleansedLines instance containing the file.
|
|
linenum: The number of the line to check.
|
|
error: The function to call with any errors found.
|
|
"""
|
|
raw = clean_lines.raw_lines
|
|
line = raw[linenum]
|
|
match = _RE_PATTERN_EXPLICIT_MAKEPAIR.search(line)
|
|
if match:
|
|
error(filename, linenum, 'build/explicit_make_pair',
|
|
4, # 4 = high confidence
|
|
'Omit template arguments from make_pair OR use pair directly OR'
|
|
' if appropriate, construct a pair directly')
|
|
|
|
|
|
def ProcessLine(filename, file_extension,
|
|
clean_lines, line, include_state, function_state,
|
|
class_state, error, extra_check_functions=[]):
|
|
"""Processes a single line in the file.
|
|
|
|
Args:
|
|
filename: Filename of the file that is being processed.
|
|
file_extension: The extension (dot not included) of the file.
|
|
clean_lines: An array of strings, each representing a line of the file,
|
|
with comments stripped.
|
|
line: Number of line being processed.
|
|
include_state: An _IncludeState instance in which the headers are inserted.
|
|
function_state: A _FunctionState instance which counts function lines, etc.
|
|
class_state: A _ClassState instance which maintains information about
|
|
the current stack of nested class declarations being parsed.
|
|
error: A callable to which errors are reported, which takes 4 arguments:
|
|
filename, line number, error level, and message
|
|
extra_check_functions: An array of additional check functions that will be
|
|
run on each source line. Each function takes 4
|
|
arguments: filename, clean_lines, line, error
|
|
"""
|
|
raw_lines = clean_lines.raw_lines
|
|
ParseNolintSuppressions(filename, raw_lines[line], line, error)
|
|
CheckForFunctionLengths(filename, clean_lines, line, function_state, error)
|
|
CheckForMultilineCommentsAndStrings(filename, clean_lines, line, error)
|
|
CheckStyle(filename, clean_lines, line, file_extension, class_state, error)
|
|
CheckLanguage(filename, clean_lines, line, file_extension, include_state,
|
|
error)
|
|
CheckForNonStandardConstructs(filename, clean_lines, line,
|
|
class_state, error)
|
|
CheckPosixThreading(filename, clean_lines, line, error)
|
|
CheckInvalidIncrement(filename, clean_lines, line, error)
|
|
CheckMakePairUsesDeduction(filename, clean_lines, line, error)
|
|
for check_fn in extra_check_functions:
|
|
check_fn(filename, clean_lines, line, error)
|
|
|
|
def ProcessFileData(filename, file_extension, lines, error,
|
|
extra_check_functions=[]):
|
|
"""Performs lint checks and reports any errors to the given error function.
|
|
|
|
Args:
|
|
filename: Filename of the file that is being processed.
|
|
file_extension: The extension (dot not included) of the file.
|
|
lines: An array of strings, each representing a line of the file, with the
|
|
last element being empty if the file is terminated with a newline.
|
|
error: A callable to which errors are reported, which takes 4 arguments:
|
|
filename, line number, error level, and message
|
|
extra_check_functions: An array of additional check functions that will be
|
|
run on each source line. Each function takes 4
|
|
arguments: filename, clean_lines, line, error
|
|
"""
|
|
lines = (['// marker so line numbers and indices both start at 1'] + lines +
|
|
['// marker so line numbers end in a known way'])
|
|
|
|
include_state = _IncludeState()
|
|
function_state = _FunctionState()
|
|
class_state = _ClassState()
|
|
|
|
ResetNolintSuppressions()
|
|
|
|
CheckForCopyright(filename, lines, error)
|
|
|
|
if file_extension == 'h':
|
|
CheckForHeaderGuard(filename, lines, error)
|
|
|
|
RemoveMultiLineComments(filename, lines, error)
|
|
clean_lines = CleansedLines(lines)
|
|
for line in xrange(clean_lines.NumLines()):
|
|
ProcessLine(filename, file_extension, clean_lines, line,
|
|
include_state, function_state, class_state, error,
|
|
extra_check_functions)
|
|
class_state.CheckFinished(filename, error)
|
|
|
|
CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error)
|
|
|
|
# We check here rather than inside ProcessLine so that we see raw
|
|
# lines rather than "cleaned" lines.
|
|
CheckForUnicodeReplacementCharacters(filename, lines, error)
|
|
|
|
CheckForNewlineAtEOF(filename, lines, error)
|
|
|
|
def ProcessFile(filename, vlevel, extra_check_functions=[]):
|
|
"""Does google-lint on a single file.
|
|
|
|
Args:
|
|
filename: The name of the file to parse.
|
|
|
|
vlevel: The level of errors to report. Every error of confidence
|
|
>= verbose_level will be reported. 0 is a good default.
|
|
|
|
extra_check_functions: An array of additional check functions that will be
|
|
run on each source line. Each function takes 4
|
|
arguments: filename, clean_lines, line, error
|
|
"""
|
|
|
|
_SetVerboseLevel(vlevel)
|
|
|
|
try:
|
|
# Support the UNIX convention of using "-" for stdin. Note that
|
|
# we are not opening the file with universal newline support
|
|
# (which codecs doesn't support anyway), so the resulting lines do
|
|
# contain trailing '\r' characters if we are reading a file that
|
|
# has CRLF endings.
|
|
# If after the split a trailing '\r' is present, it is removed
|
|
# below. If it is not expected to be present (i.e. os.linesep !=
|
|
# '\r\n' as in Windows), a warning is issued below if this file
|
|
# is processed.
|
|
|
|
if filename == '-':
|
|
lines = codecs.StreamReaderWriter(sys.stdin,
|
|
codecs.getreader('utf8'),
|
|
codecs.getwriter('utf8'),
|
|
'replace').read().split('\n')
|
|
else:
|
|
lines = codecs.open(filename, 'r', 'utf8', 'replace').read().split('\n')
|
|
|
|
carriage_return_found = False
|
|
# Remove trailing '\r'.
|
|
for linenum in range(len(lines)):
|
|
if lines[linenum].endswith('\r'):
|
|
lines[linenum] = lines[linenum].rstrip('\r')
|
|
carriage_return_found = True
|
|
|
|
except IOError:
|
|
sys.stderr.write(
|
|
"Skipping input '%s': Can't open for reading\n" % filename)
|
|
return
|
|
|
|
# Note, if no dot is found, this will give the entire filename as the ext.
|
|
file_extension = filename[filename.rfind('.') + 1:]
|
|
|
|
# When reading from stdin, the extension is unknown, so no cpplint tests
|
|
# should rely on the extension.
|
|
if (filename != '-' and file_extension != 'cc' and file_extension != 'h'
|
|
and file_extension != 'cpp'):
|
|
sys.stderr.write('Ignoring %s; not a .cc or .h file\n' % filename)
|
|
else:
|
|
ProcessFileData(filename, file_extension, lines, Error,
|
|
extra_check_functions)
|
|
if carriage_return_found and os.linesep != '\r\n':
|
|
# Use 0 for linenum since outputting only one error for potentially
|
|
# several lines.
|
|
Error(filename, 0, 'whitespace/newline', 1,
|
|
'One or more unexpected \\r (^M) found;'
|
|
'better to use only a \\n')
|
|
|
|
sys.stderr.write('Done processing %s\n' % filename)
|
|
|
|
|
|
def PrintUsage(message):
|
|
"""Prints a brief usage string and exits, optionally with an error message.
|
|
|
|
Args:
|
|
message: The optional error message.
|
|
"""
|
|
sys.stderr.write(_USAGE)
|
|
if message:
|
|
sys.exit('\nFATAL ERROR: ' + message)
|
|
else:
|
|
sys.exit(1)
|
|
|
|
|
|
def PrintCategories():
|
|
"""Prints a list of all the error-categories used by error messages.
|
|
|
|
These are the categories used to filter messages via --filter.
|
|
"""
|
|
sys.stderr.write(''.join(' %s\n' % cat for cat in _ERROR_CATEGORIES))
|
|
sys.exit(0)
|
|
|
|
|
|
def ParseArguments(args):
|
|
"""Parses the command line arguments.
|
|
|
|
This may set the output format and verbosity level as side-effects.
|
|
|
|
Args:
|
|
args: The command line arguments:
|
|
|
|
Returns:
|
|
The list of filenames to lint.
|
|
"""
|
|
try:
|
|
(opts, filenames) = getopt.getopt(args, '', ['help', 'output=', 'verbose=',
|
|
'counting=',
|
|
'filter='])
|
|
except getopt.GetoptError:
|
|
PrintUsage('Invalid arguments.')
|
|
|
|
verbosity = _VerboseLevel()
|
|
output_format = _OutputFormat()
|
|
filters = ''
|
|
counting_style = ''
|
|
|
|
for (opt, val) in opts:
|
|
if opt == '--help':
|
|
PrintUsage(None)
|
|
elif opt == '--output':
|
|
if not val in ('emacs', 'vs7'):
|
|
PrintUsage('The only allowed output formats are emacs and vs7.')
|
|
output_format = val
|
|
elif opt == '--verbose':
|
|
verbosity = int(val)
|
|
elif opt == '--filter':
|
|
filters = val
|
|
if not filters:
|
|
PrintCategories()
|
|
elif opt == '--counting':
|
|
if val not in ('total', 'toplevel', 'detailed'):
|
|
PrintUsage('Valid counting options are total, toplevel, and detailed')
|
|
counting_style = val
|
|
|
|
if not filenames:
|
|
PrintUsage('No files were specified.')
|
|
|
|
_SetOutputFormat(output_format)
|
|
_SetVerboseLevel(verbosity)
|
|
_SetFilters(filters)
|
|
_SetCountingStyle(counting_style)
|
|
|
|
return filenames
|
|
|
|
|
|
def main():
|
|
filenames = ParseArguments(sys.argv[1:])
|
|
|
|
# Change stderr to write with replacement characters so we don't die
|
|
# if we try to print something containing non-ASCII characters.
|
|
sys.stderr = codecs.StreamReaderWriter(sys.stderr,
|
|
codecs.getreader('utf8'),
|
|
codecs.getwriter('utf8'),
|
|
'replace')
|
|
|
|
_cpplint_state.ResetErrorCounts()
|
|
for filename in filenames:
|
|
ProcessFile(filename, _cpplint_state.verbose_level)
|
|
_cpplint_state.PrintErrorCounts()
|
|
|
|
sys.exit(_cpplint_state.error_count > 0)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|