cpplint.py

#!/usr/bin/python
#
# Copyright (c) 2009 Google Inc. All rights reserved.
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"""Does google-lint on c++ files.

The goal of this script is to identify places in the code that *may*
be in non-compliance with google style.  It does not attempt to fix
up these problems -- the point is to educate.  It does also not
attempt to find all problems, or to ensure that everything it does
find is legitimately a problem.

In particular, we can get very confused by /* and // inside strings!
We do a small hack, which is to ignore //'s with "'s after them on the
same line, but it is far from perfect (in either direction).
"""

import codecs
import copy
import getopt
import math  # for log
import os
import re
import sre_compile
import string
import sys
import unicodedata


_USAGE = """
Syntax: cpplint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...]
                   [--counting=total|toplevel|detailed] [--root=subdir]
                   [--linelength=digits]
        <file> [file] ...

  The style guidelines this tries to follow are those in
    http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml

  Every problem is given a confidence score from 1-5, with 5 meaning we are
  certain of the problem, and 1 meaning it could be a legitimate construct.
  This will miss some errors, and is not a substitute for a code review.

  To suppress false-positive errors of a certain category, add a
  'NOLINT(category)' comment to the line.  NOLINT or NOLINT(*)
  suppresses errors of all categories on that line.

  The files passed in will be linted; at least one file must be provided.
  Default linted extensions are .cc, .cpp, .cu, .cuh and .h.  Change the
  extensions with the --extensions flag.

  Flags:

    output=vs7
      By default, the output is formatted to ease emacs parsing.  Visual Studio
      compatible output (vs7) may also be used.  Other formats are unsupported.

    verbose=#
      Specify a number 0-5 to restrict errors to certain verbosity levels.

    filter=-x,+y,...
      Specify a comma-separated list of category-filters to apply: only
      error messages whose category names pass the filters will be printed.
      (Category names are printed with the message and look like
      "[whitespace/indent]".)  Filters are evaluated left to right.
      "-FOO" and "FOO" means "do not print categories that start with FOO".
      "+FOO" means "do print categories that start with FOO".

      Examples: --filter=-whitespace,+whitespace/braces
                --filter=whitespace,runtime/printf,+runtime/printf_format
                --filter=-,+build/include_what_you_use

      To see a list of all the categories used in cpplint, pass no arg:
         --filter=

    counting=total|toplevel|detailed
      The total number of errors found is always printed. If
      'toplevel' is provided, then the count of errors in each of
      the top-level categories like 'build' and 'whitespace' will
      also be printed. If 'detailed' is provided, then a count
      is provided for each category like 'build/class'.

    root=subdir
      The root directory used for deriving header guard CPP variable.
      By default, the header guard CPP variable is calculated as the relative
      path to the directory that contains .git, .hg, or .svn.  When this flag
      is specified, the relative path is calculated from the specified
      directory. If the specified directory does not exist, this flag is
      ignored.

      Examples:
        Assuing that src/.git exists, the header guard CPP variables for
        src/chrome/browser/ui/browser.h are:

        No flag => CHROME_BROWSER_UI_BROWSER_H_
        --root=chrome => BROWSER_UI_BROWSER_H_
        --root=chrome/browser => UI_BROWSER_H_

    linelength=digits
      This is the allowed line length for the project. The default value is
      80 characters.

      Examples:
        --linelength=120

    extensions=extension,extension,...
      The allowed file extensions that cpplint will check

      Examples:
        --extensions=hpp,cpp
"""

# We categorize each error message we print.  Here are the categories.
# We want an explicit list so we can list them all in cpplint --filter=.
# If you add a new error message with a new category, add it to the list
# here!  cpplint_unittest.py should tell you if you forget to do this.
_ERROR_CATEGORIES = [
  'build/class',
  'build/deprecated',
  'build/endif_comment',
  'build/explicit_make_pair',
  'build/forward_decl',
  'build/header_guard',
  'build/include',
  'build/include_alpha',
  'build/include_order',
  'build/include_what_you_use',
  'build/namespaces',
  'build/printf_format',
  'build/storage_class',
  'legal/copyright',
  'readability/alt_tokens',
  'readability/braces',
  'readability/casting',
  'readability/check',
  'readability/constructors',
  'readability/fn_size',
  'readability/function',
  'readability/multiline_comment',
  'readability/multiline_string',
  'readability/namespace',
  'readability/nolint',
  'readability/nul',
  'readability/streams',
  'readability/todo',
  'readability/utf8',
  'runtime/arrays',
  'runtime/casting',
  'runtime/explicit',
  'runtime/int',
  'runtime/init',
  'runtime/invalid_increment',
  'runtime/member_string_references',
  'runtime/memset',
  'runtime/operator',
  'runtime/printf',
  'runtime/printf_format',
  'runtime/references',
  'runtime/sizeof',
  'runtime/string',
  'runtime/threadsafe_fn',
  'runtime/vlog',
  'whitespace/blank_line',
  'whitespace/braces',
  'whitespace/comma',
  'whitespace/comments',
  'whitespace/empty_conditional_body',
  'whitespace/empty_loop_body',
  'whitespace/end_of_line',
  'whitespace/ending_newline',
  'whitespace/forcolon',
  'whitespace/indent',
  'whitespace/line_length',
  'whitespace/newline',
  'whitespace/operators',