Merge webkit.org at r54127 : Initial merge by git

Change-Id: Ib661abb595522f50ea406f72d3a0ce17f7193c82

1 files changed, 0 insertions, 3317 deletions

diff --git a/WebKitTools/Scripts/modules/cpp_style.py b/WebKitTools/Scripts/modules/cpp_style.py
deleted file mode 100644
index d8ca8d1..0000000
--- a/WebKitTools/Scripts/modules/cpp_style.py
+++ /dev/null
@@ -1,3317 +0,0 @@
-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-#
-# Copyright (C) 2009 Google Inc. All rights reserved.
-# Copyright (C) 2009 Torch Mobile Inc.
-# Copyright (C) 2009 Apple Inc. All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#    * Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-#    * Redistributions in binary form must reproduce the above
-# copyright notice, this list of conditions and the following disclaimer
-# in the documentation and/or other materials provided with the
-# distribution.
-#    * Neither the name of Google Inc. nor the names of its
-# contributors may be used to endorse or promote products derived from
-# this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# This is the modified version of Google's cpplint. The original code is
-# http://google-styleguide.googlecode.com/svn/trunk/cpplint/cpplint.py
-
-"""Does WebKit-lint on c++ files.
-
-The goal of this script is to identify places in the code that *may*
-be in non-compliance with WebKit style.  It does not attempt to fix
-up these problems -- the point is to educate.  It does also not
-attempt to find all problems, or to ensure that everything it does
-find is legitimately a problem.
-
-In particular, we can get very confused by /* and // inside strings!
-We do a small hack, which is to ignore //'s with "'s after them on the
-same line, but it is far from perfect (in either direction).
-"""
-
-import codecs
-import getopt
-import math  # for log
-import os
-import os.path
-import re
-import sre_compile
-import string
-import sys
-import unicodedata
-
-
-_USAGE = """
-Syntax: %(program_name)s [--verbose=#] [--output=vs7] [--filter=-x,+y,...]
-        <file> [file] ...
-
-  The style guidelines this tries to follow are those in
-    http://webkit.org/coding/coding-style.html
-
-  Every problem is given a confidence score from 1-5, with 5 meaning we are
-  certain of the problem, and 1 meaning it could be a legitimate construct.
-  This will miss some errors, and is not a substitute for a code review.
-
-  To prevent specific lines from being linted, add a '// NOLINT' comment to the
-  end of the line.
-
-  The files passed in will be linted; at least one file must be provided.
-  Linted extensions are .cpp, .c and .h.  Other file types will be ignored.
-
-  Flags:
-
-    output=vs7
-      By default, the output is formatted to ease emacs parsing.  Visual Studio
-      compatible output (vs7) may also be used.  Other formats are unsupported.
-
-    verbose=#
-      Specify a number 0-5 to restrict errors to certain verbosity levels.
-
-    filter=-x,+y,...
-      Specify a comma-separated list of category-filters to apply: only
-      error messages whose category names pass the filters will be printed.
-      (Category names are printed with the message and look like
-      "[whitespace/indent]".)  Filters are evaluated left to right.
-      "-FOO" and "FOO" means "do not print categories that start with FOO".
-      "+FOO" means "do print categories that start with FOO".
-
-      Examples: --filter=-whitespace,+whitespace/braces
-                --filter=whitespace,runtime/printf,+runtime/printf_format
-                --filter=-,+build/include_what_you_use
-
-      To see a list of all the categories used in %(program_name)s, pass no arg:
-         --filter=
-""" % {'program_name': sys.argv[0]}
-
-# We categorize each error message we print.  Here are the categories.
-# We want an explicit list so we can list them all in cpp_style --filter=.
-# If you add a new error message with a new category, add it to the list
-# here!  cpp_style_unittest.py should tell you if you forget to do this.
-# \ used for clearer layout -- pylint: disable-msg=C6013
-_ERROR_CATEGORIES = '''\
-    build/class
-    build/deprecated
-    build/endif_comment
-    build/forward_decl
-    build/header_guard
-    build/include
-    build/include_order
-    build/include_what_you_use
-    build/namespaces
-    build/printf_format
-    build/storage_class
-    build/using_std
-    legal/copyright
-    readability/braces
-    readability/casting
-    readability/check
-    readability/comparison_to_zero
-    readability/constructors
-    readability/control_flow
-    readability/fn_size
-    readability/function
-    readability/multiline_comment
-    readability/multiline_string
-    readability/naming
-    readability/null
-    readability/streams
-    readability/todo
-    readability/utf8
-    runtime/arrays
-    runtime/casting
-    runtime/explicit
-    runtime/int
-    runtime/init
-    runtime/invalid_increment
-    runtime/max_min_macros
-    runtime/memset
-    runtime/printf
-    runtime/printf_format
-    runtime/references
-    runtime/rtti
-    runtime/sizeof
-    runtime/string
-    runtime/threadsafe_fn
-    runtime/virtual
-    whitespace/blank_line
-    whitespace/braces
-    whitespace/comma
-    whitespace/comments
-    whitespace/declaration
-    whitespace/end_of_line
-    whitespace/ending_newline
-    whitespace/indent
-    whitespace/labels
-    whitespace/line_length
-    whitespace/newline
-    whitespace/operators
-    whitespace/parens
-    whitespace/semicolon
-    whitespace/tab
-    whitespace/todo
-'''
-
-# The default state of the category filter. This is overrided by the --filter=
-# flag. By default all errors are on, so only add here categories that should be
-# off by default (i.e., categories that must be enabled by the --filter= flags).
-# All entries here should start with a '-' or '+', as in the --filter= flag.
-_DEFAULT_FILTERS = []
-
-# Headers that we consider STL headers.
-_STL_HEADERS = frozenset([
-    'algobase.h', 'algorithm', 'alloc.h', 'bitset', 'deque', 'exception',
-    'function.h', 'functional', 'hash_map', 'hash_map.h', 'hash_set',
-    'hash_set.h', 'iterator', 'list', 'list.h', 'map', 'memory', 'pair.h',
-    'pthread_alloc', 'queue', 'set', 'set.h', 'sstream', 'stack',
-    'stl_alloc.h', 'stl_relops.h', 'type_traits.h',
-    'utility', 'vector', 'vector.h',
-    ])
-
-
-# Non-STL C++ system headers.
-_CPP_HEADERS = frozenset([
-    'algo.h', 'builtinbuf.h', 'bvector.h', 'cassert', 'cctype',
-    'cerrno', 'cfloat', 'ciso646', 'climits', 'clocale', 'cmath',
-    'complex', 'complex.h', 'csetjmp', 'csignal', 'cstdarg', 'cstddef',
-    'cstdio', 'cstdlib', 'cstring', 'ctime', 'cwchar', 'cwctype',
-    'defalloc.h', 'deque.h', 'editbuf.h', 'exception', 'fstream',
-    'fstream.h', 'hashtable.h', 'heap.h', 'indstream.h', 'iomanip',
-    'iomanip.h', 'ios', 'iosfwd', 'iostream', 'iostream.h', 'istream.h',
-    'iterator.h', 'limits', 'map.h', 'multimap.h', 'multiset.h',
-    'numeric', 'ostream.h', 'parsestream.h', 'pfstream.h', 'PlotFile.h',
-    'procbuf.h', 'pthread_alloc.h', 'rope', 'rope.h', 'ropeimpl.h',
-    'SFile.h', 'slist', 'slist.h', 'stack.h', 'stdexcept',
-    'stdiostream.h', 'streambuf.h', 'stream.h', 'strfile.h', 'string',
-    'strstream', 'strstream.h', 'tempbuf.h', 'tree.h', 'typeinfo', 'valarray',
-    ])
-
-
-# Assertion macros.  These are defined in base/logging.h and
-# testing/base/gunit.h.  Note that the _M versions need to come first
-# for substring matching to work.
-_CHECK_MACROS = [
-    'DCHECK', 'CHECK',
-    'EXPECT_TRUE_M', 'EXPECT_TRUE',
-    'ASSERT_TRUE_M', 'ASSERT_TRUE',
-    'EXPECT_FALSE_M', 'EXPECT_FALSE',
-    'ASSERT_FALSE_M', 'ASSERT_FALSE',
-    ]
-
-# Replacement macros for CHECK/DCHECK/EXPECT_TRUE/EXPECT_FALSE
-_CHECK_REPLACEMENT = dict([(m, {}) for m in _CHECK_MACROS])
-
-for op, replacement in [('==', 'EQ'), ('!=', 'NE'),
-                        ('>=', 'GE'), ('>', 'GT'),
-                        ('<=', 'LE'), ('<', 'LT')]:
-    _CHECK_REPLACEMENT['DCHECK'][op] = 'DCHECK_%s' % replacement
-    _CHECK_REPLACEMENT['CHECK'][op] = 'CHECK_%s' % replacement
-    _CHECK_REPLACEMENT['EXPECT_TRUE'][op] = 'EXPECT_%s' % replacement
-    _CHECK_REPLACEMENT['ASSERT_TRUE'][op] = 'ASSERT_%s' % replacement
-    _CHECK_REPLACEMENT['EXPECT_TRUE_M'][op] = 'EXPECT_%s_M' % replacement
-    _CHECK_REPLACEMENT['ASSERT_TRUE_M'][op] = 'ASSERT_%s_M' % replacement
-
-for op, inv_replacement in [('==', 'NE'), ('!=', 'EQ'),
-                            ('>=', 'LT'), ('>', 'LE'),
-                            ('<=', 'GT'), ('<', 'GE')]:
-    _CHECK_REPLACEMENT['EXPECT_FALSE'][op] = 'EXPECT_%s' % inv_replacement
-    _CHECK_REPLACEMENT['ASSERT_FALSE'][op] = 'ASSERT_%s' % inv_replacement
-    _CHECK_REPLACEMENT['EXPECT_FALSE_M'][op] = 'EXPECT_%s_M' % inv_replacement
-    _CHECK_REPLACEMENT['ASSERT_FALSE_M'][op] = 'ASSERT_%s_M' % inv_replacement
-
-
-# These constants define types of headers for use with
-# _IncludeState.check_next_include_order().
-_CONFIG_HEADER = 0
-_PRIMARY_HEADER = 1
-_OTHER_HEADER = 2
-
-
-# The regexp compilation caching is inlined in all regexp functions for
-# performance reasons; factoring it out into a separate function turns out
-# to be noticeably expensive.
-_regexp_compile_cache = {}
-
-
-def match(pattern, s):
-    """Matches the string with the pattern, caching the compiled regexp."""
-    if not pattern in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
-    return _regexp_compile_cache[pattern].match(s)
-
-
-def search(pattern, s):
-    """Searches the string for the pattern, caching the compiled regexp."""
-    if not pattern in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
-    return _regexp_compile_cache[pattern].search(s)
-
-
-def sub(pattern, replacement, s):
-    """Substitutes occurrences of a pattern, caching the compiled regexp."""
-    if not pattern in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
-    return _regexp_compile_cache[pattern].sub(replacement, s)
-
-
-def subn(pattern, replacement, s):
-    """Substitutes occurrences of a pattern, caching the compiled regexp."""
-    if not pattern in _regexp_compile_cache:
-        _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
-    return _regexp_compile_cache[pattern].subn(replacement, s)
-
-
-class _IncludeState(dict):
-    """Tracks line numbers for includes, and the order in which includes appear.
-
-    As a dict, an _IncludeState object serves as a mapping between include
-    filename and line number on which that file was included.
-
-    Call check_next_include_order() once for each header in the file, passing
-    in the type constants defined above. Calls in an illegal order will
-    raise an _IncludeError with an appropriate error message.
-
-    """
-    # self._section will move monotonically through this set. If it ever
-    # needs to move backwards, check_next_include_order will raise an error.
-    _INITIAL_SECTION = 0
-    _CONFIG_SECTION = 1
-    _PRIMARY_SECTION = 2
-    _OTHER_SECTION = 3
-
-    _TYPE_NAMES = {
-        _CONFIG_HEADER: 'WebCore config.h',
-        _PRIMARY_HEADER: 'header this file implements',
-        _OTHER_HEADER: 'other header',
-        }
-    _SECTION_NAMES = {
-        _INITIAL_SECTION: "... nothing.",
-        _CONFIG_SECTION: "WebCore config.h.",
-        _PRIMARY_SECTION: 'a header this file implements.',
-        _OTHER_SECTION: 'other header.',
-        }
-
-    def __init__(self):
-        dict.__init__(self)
-        self._section = self._INITIAL_SECTION
-        self._visited_primary_section = False
-        self.header_types = dict();
-
-    def visited_primary_section(self):
-        return self._visited_primary_section
-
-    def check_next_include_order(self, header_type, file_is_header):
-        """Returns a non-empty error message if the next header is out of order.
-
-        This function also updates the internal state to be ready to check
-        the next include.
-
-        Args:
-          header_type: One of the _XXX_HEADER constants defined above.
-          file_is_header: Whether the file that owns this _IncludeState is itself a header
-
-        Returns:
-          The empty string if the header is in the right order, or an
-          error message describing what's wrong.
-
-        """
-        if header_type == _CONFIG_HEADER and file_is_header:
-            return 'Header file should not contain WebCore config.h.'
-        if header_type == _PRIMARY_HEADER and file_is_header:
-            return 'Header file should not contain itself.'
-
-        error_message = ''
-        if self._section != self._OTHER_SECTION:
-            before_error_message = ('Found %s before %s' %
-                                    (self._TYPE_NAMES[header_type],
-                                     self._SECTION_NAMES[self._section + 1]))
-        after_error_message = ('Found %s after %s' %
-                                (self._TYPE_NAMES[header_type],
-                                 self._SECTION_NAMES[self._section]))
-
-        if header_type == _CONFIG_HEADER:
-            if self._section >= self._CONFIG_SECTION:
-                error_message = after_error_message
-            self._section = self._CONFIG_SECTION
-        elif header_type == _PRIMARY_HEADER:
-            if self._section >= self._PRIMARY_SECTION:
-                error_message = after_error_message
-            elif self._section < self._CONFIG_SECTION:
-                error_message = before_error_message
-            self._section = self._PRIMARY_SECTION
-            self._visited_primary_section = True
-        else:
-            assert header_type == _OTHER_HEADER
-            if not file_is_header and self._section < self._PRIMARY_SECTION:
-                error_message = before_error_message
-            self._section = self._OTHER_SECTION
-
-        return error_message
-
-
-class _CppStyleState(object):
-    """Maintains module-wide state.."""
-
-    def __init__(self):
-        self.verbose_level = 1  # global setting.
-        self.error_count = 0    # global count of reported errors
-        # filters to apply when emitting error messages
-        self.filters = _DEFAULT_FILTERS[:]
-
-        # output format:
-        # "emacs" - format that emacs can parse (default)
-        # "vs7" - format that Microsoft Visual Studio 7 can parse
-        self.output_format = 'emacs'
-
-    def set_output_format(self, output_format):
-        """Sets the output format for errors."""
-        self.output_format = output_format
-
-    def set_verbose_level(self, level):
-        """Sets the module's verbosity, and returns the previous setting."""
-        last_verbose_level = self.verbose_level
-        self.verbose_level = level
-        return last_verbose_level
-
-    def set_filters(self, filters):
-        """Sets the error-message filters.
-
-        These filters are applied when deciding whether to emit a given
-        error message.
-
-        Args:
-          filters: A string of comma-separated filters (eg "+whitespace/indent").
-                   Each filter should start with + or -; else we die.
-
-        Raises:
-          ValueError: The comma-separated filters did not all start with '+' or '-'.
-                      E.g. "-,+whitespace,-whitespace/indent,whitespace/badfilter"
-        """
-        # Default filters always have less priority than the flag ones.
-        self.filters = _DEFAULT_FILTERS[:]
-        for filter in filters.split(','):
-            clean_filter = filter.strip()
-            if clean_filter:
-                self.filters.append(clean_filter)
-        for filter in self.filters:
-            if not (filter.startswith('+') or filter.startswith('-')):
-                raise ValueError('Every filter in --filter must start with '
-                                 '+ or - (%s does not)' % filter)
-
-    def reset_error_count(self):
-        """Sets the module's error statistic back to zero."""
-        self.error_count = 0
-
-    def increment_error_count(self):
-        """Bumps the module's error statistic."""
-        self.error_count += 1
-
-
-_cpp_style_state = _CppStyleState()
-
-
-def _output_format():
-    """Gets the module's output format."""
-    return _cpp_style_state.output_format
-
-
-def _set_output_format(output_format):
-    """Sets the module's output format."""
-    _cpp_style_state.set_output_format(output_format)
-
-
-def _verbose_level():
-    """Returns the module's verbosity setting."""
-    return _cpp_style_state.verbose_level
-
-
-def _set_verbose_level(level):
-    """Sets the module's verbosity, and returns the previous setting."""
-    return _cpp_style_state.set_verbose_level(level)
-
-
-def _filters():
-    """Returns the module's list of output filters, as a list."""
-    return _cpp_style_state.filters
-
-
-def _set_filters(filters):
-    """Sets the module's error-message filters.
-
-    These filters are applied when deciding whether to emit a given
-    error message.
-
-    Args:
-      filters: A string of comma-separated filters (eg "whitespace/indent").
-               Each filter should start with + or -; else we die.
-    """
-    _cpp_style_state.set_filters(filters)
-
-
-def error_count():
-    """Returns the global count of reported errors."""
-    return _cpp_style_state.error_count
-
-
-class _FunctionState(object):
-    """Tracks current function name and the number of lines in its body."""
-
-    _NORMAL_TRIGGER = 250  # for --v=0, 500 for --v=1, etc.
-    _TEST_TRIGGER = 400    # about 50% more than _NORMAL_TRIGGER.
-
-    def __init__(self):
-        self.in_a_function = False
-        self.lines_in_function = 0
-        self.current_function = ''
-
-    def begin(self, function_name):
-        """Start analyzing function body.
-
-        Args:
-            function_name: The name of the function being tracked.
-        """
-        self.in_a_function = True
-        self.lines_in_function = 0
-        self.current_function = function_name
-
-    def count(self):
-        """Count line in current function body."""
-        if self.in_a_function:
-            self.lines_in_function += 1
-
-    def check(self, error, filename, line_number):
-        """Report if too many lines in function body.
-
-        Args:
-          error: The function to call with any errors found.
-          filename: The name of the current file.
-          line_number: The number of the line to check.
-        """
-        if match(r'T(EST|est)', self.current_function):
-            base_trigger = self._TEST_TRIGGER
-        else:
-            base_trigger = self._NORMAL_TRIGGER
-        trigger = base_trigger * 2 ** _verbose_level()
-
-        if self.lines_in_function > trigger:
-            error_level = int(math.log(self.lines_in_function / base_trigger, 2))
-            # 50 => 0, 100 => 1, 200 => 2, 400 => 3, 800 => 4, 1600 => 5, ...
-            if error_level > 5:
-                error_level = 5
-            error(filename, line_number, 'readability/fn_size', error_level,
-                  'Small and focused functions are preferred:'
-                  ' %s has %d non-comment lines'
-                  ' (error triggered by exceeding %d lines).'  % (
-                      self.current_function, self.lines_in_function, trigger))
-
-    def end(self):
-        """Stop analizing function body."""
-        self.in_a_function = False
-
-
-class _IncludeError(Exception):
-    """Indicates a problem with the include order in a file."""
-    pass
-
-
-class FileInfo:
-    """Provides utility functions for filenames.
-
-    FileInfo provides easy access to the components of a file's path
-    relative to the project root.
-    """
-
-    def __init__(self, filename):
-        self._filename = filename
-
-    def full_name(self):
-        """Make Windows paths like Unix."""
-        return os.path.abspath(self._filename).replace('\\', '/')
-
-    def repository_name(self):
-        """Full name after removing the local path to the repository.
-
-        If we have a real absolute path name here we can try to do something smart:
-        detecting the root of the checkout and truncating /path/to/checkout from
-        the name so that we get header guards that don't include things like
-        "C:\Documents and Settings\..." or "/home/username/..." in them and thus
-        people on different computers who have checked the source out to different
-        locations won't see bogus errors.
-        """
-        fullname = self.full_name()
-
-        if os.path.exists(fullname):
-            project_dir = os.path.dirname(fullname)
-
-            if os.path.exists(os.path.join(project_dir, ".svn")):
-                # If there's a .svn file in the current directory, we
-                # recursively look up the directory tree for the top
-                # of the SVN checkout
-                root_dir = project_dir
-                one_up_dir = os.path.dirname(root_dir)
-                while os.path.exists(os.path.join(one_up_dir, ".svn")):
-                    root_dir = os.path.dirname(root_dir)
-                    one_up_dir = os.path.dirname(one_up_dir)
-
-                prefix = os.path.commonprefix([root_dir, project_dir])
-                return fullname[len(prefix) + 1:]
-
-            # Not SVN? Try to find a git top level directory by
-            # searching up from the current path.
-            root_dir = os.path.dirname(fullname)
-            while (root_dir != os.path.dirname(root_dir)
-                   and not os.path.exists(os.path.join(root_dir, ".git"))):
-                root_dir = os.path.dirname(root_dir)
-                if os.path.exists(os.path.join(root_dir, ".git")):
-                    prefix = os.path.commonprefix([root_dir, project_dir])
-                    return fullname[len(prefix) + 1:]
-
-        # Don't know what to do; header guard warnings may be wrong...
-        return fullname
-
-    def split(self):
-        """Splits the file into the directory, basename, and extension.
-
-        For 'chrome/browser/browser.cpp', Split() would
-        return ('chrome/browser', 'browser', '.cpp')
-
-        Returns:
-          A tuple of (directory, basename, extension).
-        """
-
-        googlename = self.repository_name()
-        project, rest = os.path.split(googlename)
-        return (project,) + os.path.splitext(rest)
-
-    def base_name(self):
-        """File base name - text after the final slash, before the final period."""
-        return self.split()[1]
-
-    def extension(self):
-        """File extension - text following the final period."""
-        return self.split()[2]
-
-    def no_extension(self):
-        """File has no source file extension."""
-        return '/'.join(self.split()[0:2])
-
-    def is_source(self):
-        """File has a source file extension."""
-        return self.extension()[1:] in ('c', 'cc', 'cpp', 'cxx')
-
-
-def _should_print_error(category, confidence):
-    """Returns true iff confidence >= verbose, and category passes filter."""
-    # There are two ways we might decide not to print an error message:
-    # the verbosity level isn't high enough, or the filters filter it out.
-    if confidence < _cpp_style_state.verbose_level:
-        return False
-
-    is_filtered = False
-    for one_filter in _filters():
-        if one_filter.startswith('-'):
-            if category.startswith(one_filter[1:]):
-                is_filtered = True
-        elif one_filter.startswith('+'):
-            if category.startswith(one_filter[1:]):
-                is_filtered = False
-        else:
-            assert False  # should have been checked for in set_filter.
-    if is_filtered:
-        return False
-
-    return True
-
-
-def error(filename, line_number, category, confidence, message):
-    """Logs the fact we've found a lint error.
-
-    We log where the error was found, and also our confidence in the error,
-    that is, how certain we are this is a legitimate style regression, and
-    not a misidentification or a use that's sometimes justified.
-
-    Args:
-      filename: The name of the file containing the error.
-      line_number: The number of the line containing the error.
-      category: A string used to describe the "category" this bug
-                falls under: "whitespace", say, or "runtime".  Categories
-                may have a hierarchy separated by slashes: "whitespace/indent".
-      confidence: A number from 1-5 representing a confidence score for
-                  the error, with 5 meaning that we are certain of the problem,
-                  and 1 meaning that it could be a legitimate construct.
-      message: The error message.
-    """
-    # There are two ways we might decide not to print an error message:
-    # the verbosity level isn't high enough, or the filters filter it out.
-    if _should_print_error(category, confidence):
-        _cpp_style_state.increment_error_count()
-        if _cpp_style_state.output_format == 'vs7':
-            sys.stderr.write('%s(%s):  %s  [%s] [%d]\n' % (
-                filename, line_number, message, category, confidence))
-        else:
-            sys.stderr.write('%s:%s:  %s  [%s] [%d]\n' % (
-                filename, line_number, message, category, confidence))
-
-
-# Matches standard C++ escape esequences per 2.13.2.3 of the C++ standard.
-_RE_PATTERN_CLEANSE_LINE_ESCAPES = re.compile(
-    r'\\([abfnrtv?"\\\']|\d+|x[0-9a-fA-F]+)')
-# Matches strings.  Escape codes should already be removed by ESCAPES.
-_RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES = re.compile(r'"[^"]*"')
-# Matches characters.  Escape codes should already be removed by ESCAPES.
-_RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES = re.compile(r"'.'")
-# Matches multi-line C++ comments.
-# This RE is a little bit more complicated than one might expect, because we
-# have to take care of space removals tools so we can handle comments inside
-# statements better.
-# The current rule is: We only clear spaces from both sides when we're at the
-# end of the line. Otherwise, we try to remove spaces from the right side,
-# if this doesn't work we try on left side but only if there's a non-character
-# on the right.
-_RE_PATTERN_CLEANSE_LINE_C_COMMENTS = re.compile(
-    r"""(\s*/\*.*\*/\s*$|
-            /\*.*\*/\s+|
-         \s+/\*.*\*/(?=\W)|
-            /\*.*\*/)""", re.VERBOSE)
-
-
-def is_cpp_string(line):
-    """Does line terminate so, that the next symbol is in string constant.
-
-    This function does not consider single-line nor multi-line comments.
-
-    Args:
-      line: is a partial line of code starting from the 0..n.
-
-    Returns:
-      True, if next character appended to 'line' is inside a
-      string constant.
-    """
-
-    line = line.replace(r'\\', 'XX')  # after this, \\" does not match to \"
-    return ((line.count('"') - line.count(r'\"') - line.count("'\"'")) & 1) == 1
-
-
-def find_next_multi_line_comment_start(lines, line_index):
-    """Find the beginning marker for a multiline comment."""
-    while line_index < len(lines):
-        if lines[line_index].strip().startswith('/*'):
-            # Only return this marker if the comment goes beyond this line
-            if lines[line_index].strip().find('*/', 2) < 0:
-                return line_index
-        line_index += 1
-    return len(lines)
-
-
-def find_next_multi_line_comment_end(lines, line_index):
-    """We are inside a comment, find the end marker."""
-    while line_index < len(lines):
-        if lines[line_index].strip().endswith('*/'):
-            return line_index
-        line_index += 1
-    return len(lines)
-
-
-def remove_multi_line_comments_from_range(lines, begin, end):
-    """Clears a range of lines for multi-line comments."""
-    # Having // dummy comments makes the lines non-empty, so we will not get
-    # unnecessary blank line warnings later in the code.
-    for i in range(begin, end):
-        lines[i] = '// dummy'
-
-
-def remove_multi_line_comments(filename, lines, error):
-    """Removes multiline (c-style) comments from lines."""
-    line_index = 0
-    while line_index < len(lines):
-        line_index_begin = find_next_multi_line_comment_start(lines, line_index)
-        if line_index_begin >= len(lines):
-            return
-        line_index_end = find_next_multi_line_comment_end(lines, line_index_begin)
-        if line_index_end >= len(lines):
-            error(filename, line_index_begin + 1, 'readability/multiline_comment', 5,
-                  'Could not find end of multi-line comment')
-            return
-        remove_multi_line_comments_from_range(lines, line_index_begin, line_index_end + 1)
-        line_index = line_index_end + 1
-
-
-def cleanse_comments(line):
-    """Removes //-comments and single-line C-style /* */ comments.
-
-    Args:
-      line: A line of C++ source.
-
-    Returns:
-      The line with single-line comments removed.
-    """
-    comment_position = line.find('//')
-    if comment_position != -1 and not is_cpp_string(line[:comment_position]):
-        line = line[:comment_position]
-    # get rid of /* ... */
-    return _RE_PATTERN_CLEANSE_LINE_C_COMMENTS.sub('', line)
-
-
-class CleansedLines(object):
-    """Holds 3 copies of all lines with different preprocessing applied to them.
-
-    1) elided member contains lines without strings and comments,
-    2) lines member contains lines without comments, and
-    3) raw member contains all the lines without processing.
-    All these three members are of <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 line_number in range(len(lines)):
-            self.lines.append(cleanse_comments(lines[line_number]))
-            elided = self.collapse_strings(lines[line_number])
-            self.elided.append(cleanse_comments(elided))
-
-    def num_lines(self):
-        """Returns the number of lines represented."""
-        return self._num_lines
-
-    @staticmethod
-    def collapse_strings(elided):
-        """Collapses strings and chars on a line to simple "" or '' blocks.
-
-        We nix strings first so we're not fooled by text like '"http://"'
-
-        Args:
-          elided: The line being processed.
-
-        Returns:
-          The line with collapsed strings.
-        """
-        if not _RE_PATTERN_INCLUDE.match(elided):
-            # Remove escaped characters first to make quote/single quote collapsing
-            # basic.  Things that look like escaped characters shouldn't occur
-            # outside of strings and chars.
-            elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub('', elided)
-            elided = _RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES.sub("''", elided)
-            elided = _RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES.sub('""', elided)
-        return elided
-
-
-def close_expression(clean_lines, line_number, pos):
-    """If input points to ( or { or [, finds the position that closes it.
-
-    If lines[line_number][pos] points to a '(' or '{' or '[', finds the the
-    line_number/pos that correspond to the closing of the expression.
-
-    Args:
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      pos: A position on the line.
-
-    Returns:
-      A tuple (line, line_number, pos) pointer *past* the closing brace, or
-      (line, len(lines), -1) if we never find a close.  Note we ignore
-      strings and comments when matching; and the line we return is the
-      'cleansed' line at line_number.
-    """
-
-    line = clean_lines.elided[line_number]
-    start_character = line[pos]
-    if start_character not in '({[':
-        return (line, clean_lines.num_lines(), -1)
-    if start_character == '(':
-        end_character = ')'
-    if start_character == '[':
-        end_character = ']'
-    if start_character == '{':
-        end_character = '}'
-
-    num_open = line.count(start_character) - line.count(end_character)
-    while line_number < clean_lines.num_lines() and num_open > 0:
-        line_number += 1
-        line = clean_lines.elided[line_number]
-        num_open += line.count(start_character) - line.count(end_character)
-    # OK, now find the end_character that actually got us back to even
-    endpos = len(line)
-    while num_open >= 0:
-        endpos = line.rfind(')', 0, endpos)
-        num_open -= 1                 # chopped off another )
-    return (line, line_number, endpos + 1)
-
-
-def check_for_copyright(filename, lines, error):
-    """Logs an error if no Copyright message appears at the top of the file."""
-
-    # We'll say it should occur by line 10. Don't forget there's a
-    # dummy line at the front.
-    for line in xrange(1, min(len(lines), 11)):
-        if re.search(r'Copyright', 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 get_header_guard_cpp_variable(filename):
-    """Returns the CPP variable that should be used as a header guard.
-
-    Args:
-      filename: The name of a C++ header file.
-
-    Returns:
-      The CPP variable that should be used as a header guard in the
-      named file.
-
-    """
-
-    fileinfo = FileInfo(filename)
-    return sub(r'[-./\s]', '_', fileinfo.repository_name()).upper() + '_'
-
-
-def check_for_header_guard(filename, lines, error):
-    """Checks that the file contains a header guard.
-
-    Logs an error if no #ifndef header guard is present.  For other
-    headers, checks that the full pathname is used.
-
-    Args:
-      filename: The name of the C++ header file.
-      lines: An array of strings, each representing a line of the file.
-      error: The function to call with any errors found.
-    """
-
-    cppvar = get_header_guard_cpp_variable(filename)
-
-    ifndef = None
-    ifndef_line_number = 0
-    define = None
-    endif = None
-    endif_line_number = 0
-    for line_number, line in enumerate(lines):
-        line_split = line.split()
-        if len(line_split) >= 2:
-            # find the first occurrence of #ifndef and #define, save arg
-            if not ifndef and line_split[0] == '#ifndef':
-                # set ifndef to the header guard presented on the #ifndef line.
-                ifndef = line_split[1]
-                ifndef_line_number = line_number
-            if not define and line_split[0] == '#define':
-                define = line_split[1]
-        # find the last occurrence of #endif, save entire line
-        if line.startswith('#endif'):
-            endif = line
-            endif_line_number = line_number
-
-    if not ifndef or not define or ifndef != define:
-        error(filename, 0, 'build/header_guard', 5,
-              'No #ifndef header guard found, suggested CPP variable is: %s' %
-              cppvar)
-        return
-
-    # The guard should be PATH_FILE_H_, but we also allow PATH_FILE_H__
-    # for backward compatibility.
-    if ifndef != cppvar:
-        error_level = 0
-        if ifndef != cppvar + '_':
-            error_level = 5
-
-        error(filename, ifndef_line_number, 'build/header_guard', error_level,
-              '#ifndef header guard has wrong style, please use: %s' % cppvar)
-
-    if endif != ('#endif  // %s' % cppvar):
-        error_level = 0
-        if endif != ('#endif  // %s' % (cppvar + '_')):
-            error_level = 5
-
-        error(filename, endif_line_number, 'build/header_guard', error_level,
-              '#endif line should be "#endif  // %s"' % cppvar)
-
-
-def check_for_unicode_replacement_characters(filename, lines, error):
-    """Logs an error for each line containing Unicode replacement characters.
-
-    These indicate that either the file contained invalid UTF-8 (likely)
-    or Unicode replacement characters (which it shouldn't).  Note that
-    it's possible for this to throw off line numbering if the invalid
-    UTF-8 occurred adjacent to a newline.
-
-    Args:
-      filename: The name of the current file.
-      lines: An array of strings, each representing a line of the file.
-      error: The function to call with any errors found.
-    """
-    for line_number, line in enumerate(lines):
-        if u'\ufffd' in line:
-            error(filename, line_number, 'readability/utf8', 5,
-                  'Line contains invalid UTF-8 (or Unicode replacement character).')
-
-
-def check_for_new_line_at_eof(filename, lines, error):
-    """Logs an error if there is no newline char at the end of the file.
-
-    Args:
-      filename: The name of the current file.
-      lines: An array of strings, each representing a line of the file.
-      error: The function to call with any errors found.
-    """
-
-    # The array lines() was created by adding two newlines to the
-    # original file (go figure), then splitting on \n.
-    # To verify that the file ends in \n, we just have to make sure the
-    # last-but-two element of lines() exists and is empty.
-    if len(lines) < 3 or lines[-2]:
-        error(filename, len(lines) - 2, 'whitespace/ending_newline', 5,
-              'Could not find a newline character at the end of the file.')
-
-
-def check_for_multiline_comments_and_strings(filename, clean_lines, line_number, error):
-    """Logs an error if we see /* ... */ or "..." that extend past one line.
-
-    /* ... */ comments are legit inside macros, for one line.
-    Otherwise, we prefer // comments, so it's ok to warn about the
-    other.  Likewise, it's ok for strings to extend across multiple
-    lines, as long as a line continuation character (backslash)
-    terminates each line. Although not currently prohibited by the C++
-    style guide, it's ugly and unnecessary. We don't do well with either
-    in this lint program, so we warn about both.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-    line = clean_lines.elided[line_number]
-
-    # Remove all \\ (escaped backslashes) from the line. They are OK, and the
-    # second (escaped) slash may trigger later \" detection erroneously.
-    line = line.replace('\\\\', '')
-
-    if line.count('/*') > line.count('*/'):
-        error(filename, line_number, 'readability/multiline_comment', 5,
-              'Complex multi-line /*...*/-style comment found. '
-              'Lint may give bogus warnings.  '
-              'Consider replacing these with //-style comments, '
-              'with #if 0...#endif, '
-              'or with more clearly structured multi-line comments.')
-
-    if (line.count('"') - line.count('\\"')) % 2:
-        error(filename, line_number, 'readability/multiline_string', 5,
-              'Multi-line string ("...") found.  This lint script doesn\'t '
-              'do well with such strings, and may give bogus warnings.  They\'re '
-              'ugly and unnecessary, and you should use concatenation instead".')
-
-
-_THREADING_LIST = (
-    ('asctime(', 'asctime_r('),
-    ('ctime(', 'ctime_r('),
-    ('getgrgid(', 'getgrgid_r('),
-    ('getgrnam(', 'getgrnam_r('),
-    ('getlogin(', 'getlogin_r('),
-    ('getpwnam(', 'getpwnam_r('),
-    ('getpwuid(', 'getpwuid_r('),
-    ('gmtime(', 'gmtime_r('),
-    ('localtime(', 'localtime_r('),
-    ('rand(', 'rand_r('),
-    ('readdir(', 'readdir_r('),
-    ('strtok(', 'strtok_r('),
-    ('ttyname(', 'ttyname_r('),
-    )
-
-
-def check_posix_threading(filename, clean_lines, line_number, error):
-    """Checks for calls to thread-unsafe functions.
-
-    Much code has been originally written without consideration of
-    multi-threading. Also, engineers are relying on their old experience;
-    they have learned posix before threading extensions were added. These
-    tests guide the engineers to use thread-safe functions (when using
-    posix directly).
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-    line = clean_lines.elided[line_number]
-    for single_thread_function, multithread_safe_function in _THREADING_LIST:
-        index = line.find(single_thread_function)
-        # Comparisons made explicit for clarity -- pylint: disable-msg=C6403
-        if index >= 0 and (index == 0 or (not line[index - 1].isalnum()
-                                          and line[index - 1] not in ('_', '.', '>'))):
-            error(filename, line_number, 'runtime/threadsafe_fn', 2,
-                  'Consider using ' + multithread_safe_function +
-                  '...) instead of ' + single_thread_function +
-                  '...) for improved thread safety.')
-
-
-# Matches invalid increment: *count++, which moves pointer instead of
-# incrementing a value.
-_RE_PATTERN_INVALID_INCREMENT = re.compile(
-    r'^\s*\*\w+(\+\+|--);')
-
-
-def check_invalid_increment(filename, clean_lines, line_number, error):
-    """Checks for invalid increment *count++.
-
-    For example following function:
-    void increment_counter(int* count) {
-        *count++;
-    }
-    is invalid, because it effectively does count++, moving pointer, and should
-    be replaced with ++*count, (*count)++ or *count += 1.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-    line = clean_lines.elided[line_number]
-    if _RE_PATTERN_INVALID_INCREMENT.match(line):
-        error(filename, line_number, 'runtime/invalid_increment', 5,
-              'Changing pointer instead of value (or unused value of operator*).')
-
-
-class _ClassInfo(object):
-    """Stores information about a class."""
-
-    def __init__(self, name, line_number):
-        self.name = name
-        self.line_number = line_number
-        self.seen_open_brace = False
-        self.is_derived = False
-        self.virtual_method_line_number = None
-        self.has_virtual_destructor = False
-        self.brace_depth = 0
-
-
-class _ClassState(object):
-    """Holds the current state of the parse relating to class declarations.
-
-    It maintains a stack of _ClassInfos representing the parser's guess
-    as to the current nesting of class declarations. The innermost class
-    is at the top (back) of the stack. Typically, the stack will either
-    be empty or have exactly one entry.
-    """
-
-    def __init__(self):
-        self.classinfo_stack = []
-
-    def check_finished(self, filename, error):
-        """Checks that all classes have been completely parsed.
-
-        Call this when all lines in a file have been processed.
-        Args:
-          filename: The name of the current file.
-          error: The function to call with any errors found.
-        """
-        if self.classinfo_stack:
-            # Note: This test can result in false positives if #ifdef constructs
-            # get in the way of brace matching. See the testBuildClass test in
-            # cpp_style_unittest.py for an example of this.
-            error(filename, self.classinfo_stack[0].line_number, 'build/class', 5,
-                  'Failed to find complete declaration of class %s' %
-                  self.classinfo_stack[0].name)
-
-
-class _FileState(object):
-    def __init__(self):
-        self._did_inside_namespace_indent_warning = False
-
-    def set_did_inside_namespace_indent_warning(self):
-        self._did_inside_namespace_indent_warning = True
-
-    def did_inside_namespace_indent_warning(self):
-        return self._did_inside_namespace_indent_warning
-
-def check_for_non_standard_constructs(filename, clean_lines, line_number,
-                                      class_state, error):
-    """Logs an error if we see certain non-ANSI constructs ignored by gcc-2.
-
-    Complain about several constructs which gcc-2 accepts, but which are
-    not standard C++.  Warning about these in lint is one way to ease the
-    transition to new compilers.
-    - put storage class first (e.g. "static const" instead of "const static").
-    - "%lld" instead of %qd" in printf-type functions.
-    - "%1$d" is non-standard in printf-type functions.
-    - "\%" is an undefined character escape sequence.
-    - text after #endif is not allowed.
-    - invalid inner-style forward declaration.
-    - >? and <? 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 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.
-      line_number: 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[line_number]
-
-    if search(r'printf\s*\(.*".*%[-+ ]?\d*q', line):
-        error(filename, line_number, 'runtime/printf_format', 3,
-              '%q in format strings is deprecated.  Use %ll instead.')
-
-    if search(r'printf\s*\(.*".*%\d+\$', line):
-        error(filename, line_number, '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, line_number, '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[line_number]
-
-    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, line_number, 'build/storage_class', 5,
-              'Storage class (static, extern, typedef, etc) should be first.')
-
-    if match(r'\s*#\s*endif\s*[^/\s]+', line):
-        error(filename, line_number, '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, line_number, '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, line_number, 'build/deprecated', 3,
-              '>? and <? (max and min) operators are non-standard and deprecated.')
-
-    # 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
-    class_decl_match = match(
-        r'\s*(template\s*<[\w\s<>,:]*>\s*)?(class|struct)\s+(\w+(::\w+)*)', line)
-    if class_decl_match:
-        classinfo_stack.append(_ClassInfo(class_decl_match.group(3), line_number))
-
-    # Everything else in this function uses the top of the stack if it's
-    # not empty.
-    if not classinfo_stack:
-        return
-
-    classinfo = classinfo_stack[-1]
-
-    # If the opening brace hasn't been seen look for it and also
-    # parent class declarations.
-    if not classinfo.seen_open_brace:
-        # If the line has a ';' in it, assume it's a forward declaration or
-        # a single-line class declaration, which we won't process.
-        if line.find(';') != -1:
-            classinfo_stack.pop()
-            return
-        classinfo.seen_open_brace = (line.find('{') != -1)
-        # Look for a bare ':'
-        if search('(^|[^:]):($|[^:])', line):
-            classinfo.is_derived = True
-        if not classinfo.seen_open_brace:
-            return  # Everything else in this function is for after open brace
-
-    # The class may have been declared with namespace or classname qualifiers.
-    # The constructor and destructor will not have those qualifiers.
-    base_classname = classinfo.name.split('::')[-1]
-
-    # Look for single-argument constructors that aren't marked explicit.
-    # Technically a valid construct, but against style.
-    args = match(r'(?<!explicit)\s+%s\s*\(([^,()]+)\)'
-                 % re.escape(base_classname),
-                 line)
-    if (args
-        and args.group(1) != 'void'
-        and not match(r'(const\s+)?%s\s*&' % re.escape(base_classname),
-                      args.group(1).strip())):
-        error(filename, line_number, 'runtime/explicit', 5,
-              'Single-argument constructors should be marked explicit.')
-
-    # Look for methods declared virtual.
-    if search(r'\bvirtual\b', line):
-        classinfo.virtual_method_line_number = line_number
-        # 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_line_number is not None)
-            and (not classinfo.has_virtual_destructor)
-            and (not classinfo.is_derived)):  # Only warn for base classes
-            error(filename, classinfo.line_number, '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_line_number))
-    else:
-        classinfo.brace_depth = brace_depth
-
-
-def check_spacing_for_function_call(filename, line, line_number, 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.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    # Since function calls often occur inside if/for/foreach/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.
-    function_call = line    # if there's no control flow construct, look at whole line
-    for pattern in (r'\bif\s*\((.*)\)\s*{',
-                    r'\bfor\s*\((.*)\)\s*{',
-                    r'\bforeach\s*\((.*)\)\s*{',
-                    r'\bwhile\s*\((.*)\)\s*[{;]',
-                    r'\bswitch\s*\((.*)\)\s*{'):
-        matched = search(pattern, line)
-        if matched:
-            function_call = matched.group(1)    # look inside the parens for function calls
-            break
-
-    # Except in if/for/foreach/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|foreach|while|switch|return|new|delete)\b', function_call)
-        # Ignore pointers/references to functions.
-        and not search(r' \([^)]+\)\([^)]*(\)|,$)', function_call)
-        # Ignore pointers/references to arrays.
-        and not search(r' \([^)]+\)\[[^\]]+\]', function_call)):
-        if search(r'\w\s*\([ \t](?!\s*\\$)', function_call):      # a ( used for a fn call
-            error(filename, line_number, 'whitespace/parens', 4,
-                  'Extra space after ( in function call')
-        elif search(r'\([ \t]+(?!(\s*\\)|\()', function_call):
-            error(filename, line_number, 'whitespace/parens', 2,
-                  'Extra space after (')
-        if (search(r'\w\s+\(', function_call)
-            and not search(r'#\s*define|typedef', function_call)):
-            error(filename, line_number, 'whitespace/parens', 4,
-                  'Extra space before ( in function call')
-        # If the ) is followed only by a newline or a { + newline, assume it's
-        # part of a control statement (if/while/etc), and don't complain
-        if search(r'[^)\s]\s+\)(?!\s*$|{\s*$)', function_call):
-            error(filename, line_number, 'whitespace/parens', 2,
-                  'Extra space before )')
-
-
-def is_blank_line(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 check_for_function_lengths(filename, clean_lines, line_number,
-                               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 commments 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.
-      line_number: 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[line_number]
-    raw = clean_lines.raw_lines
-    raw_line = raw[line_number]
-    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_line_number in xrange(line_number, clean_lines.num_lines()):
-            start_line = lines[start_line_number]
-            joined_line += ' ' + start_line.lstrip()
-            if search(r'(;|})', start_line):  # Declarations and trivial functions
-                body_found = True
-                break                              # ... ignore
-            if 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, line_number, 'readability/fn_size', 5,
-                  'Lint failed to find start of function body.')
-    elif match(r'^\}\s*$', line):  # function end
-        if not search(r'\bNOLINT\b', raw_line):
-            function_state.check(error, filename, line_number)
-        function_state.end()
-    elif not match(r'^\s*$', line):
-        function_state.count()  # Count non-blank/non-comment lines.
-
-
-def check_spacing(filename, clean_lines, line_number, 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 have too many
-    blank lines in a row.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    raw = clean_lines.raw_lines
-    line = raw[line_number]
-
-    # 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 is_blank_line(line):
-        elided = clean_lines.elided
-        previous_line = elided[line_number - 1]
-        previous_brace = previous_line.rfind('{')
-        # FIXME: 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 (previous_brace != -1 and previous_line[previous_brace:].find('}') == -1
-            and previous_line[:previous_brace].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', previous_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 = line_number - 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*$|:)',
-                                   previous_line)
-                             or match(r' {4}:', previous_line))
-
-            if not exception:
-                error(filename, line_number, 'whitespace/blank_line', 2,
-                      'Blank line at the start of a code block.  Is this needed?')
-        # This doesn't ignore whitespace at the end of a namespace block
-        # because that is too hard without pairing open/close braces;
-        # however, a special exception is made for namespace closing
-        # brackets which have a comment containing "namespace".
-        #
-        # Also, ignore blank lines at the end of a block in a long if-else
-        # chain, like this:
-        #   if (condition1) {
-        #     // Something followed by a blank line
-        #
-        #   } else if (condition2) {
-        #     // Something else
-        #   }
-        if line_number + 1 < clean_lines.num_lines():
-            next_line = raw[line_number + 1]
-            if (next_line
-                and match(r'\s*}', next_line)
-                and next_line.find('namespace') == -1
-                and next_line.find('} else ') == -1):
-                error(filename, line_number, 'whitespace/blank_line', 3,
-                      'Blank line at the end of a code block.  Is this needed?')
-
-    # Next, we complain if there's a comment too near the text
-    comment_position = line.find('//')
-    if comment_position != -1:
-        # Check if the // may be in quotes.  If so, ignore it
-        # Comparisons made explicit for clarity -- pylint: disable-msg=C6403
-        if (line.count('"', 0, comment_position) - line.count('\\"', 0, comment_position)) % 2 == 0:   # not in quotes
-            # Allow one space for new scopes, two spaces otherwise:
-            if (not match(r'^\s*{ //', line)
-                and ((comment_position >= 1
-                      and line[comment_position-1] not in string.whitespace)
-                     or (comment_position >= 2
-                         and line[comment_position-2] not in string.whitespace))):
-                error(filename, line_number, 'whitespace/comments', 2,
-                      'At least two spaces is best between code and comments')
-            # There should always be a space between the // and the comment
-            commentend = comment_position + 2
-            if commentend < len(line) and not line[commentend] == ' ':
-                # but some lines are exceptions -- e.g. if they're big
-                # comment delimiters like:
-                # //----------------------------------------------------------
-                # or they begin with multiple slashes followed by a space:
-                # //////// Header comment
-                matched = (search(r'[=/-]{4,}\s*$', line[commentend:])
-                           or search(r'^/+ ', line[commentend:]))
-                if not matched:
-                    error(filename, line_number, 'whitespace/comments', 4,
-                          'Should have a space between // and comment')
-
-    line = clean_lines.elided[line_number]  # get rid of comments and strings
-
-    # Don't try to do spacing checks for operator methods
-    line = sub(r'operator(==|!=|<|<<|<=|>=|>>|>)\(', 'operator\(', line)
-    # Don't try to do spacing checks for #include or #import statements at
-    # minimum because it messes up checks for spacing around /
-    if match(r'\s*#\s*(?:include|import)', line):
-        return
-    if search(r'[\w.]=[\w.]', line):
-        error(filename, line_number, 'whitespace/operators', 4,
-              'Missing spaces around =')
-
-    # FIXME: It's not ok to have spaces around binary operators like .
-
-    # You should always have whitespace around binary operators.
-    # Alas, we can't test < or > because they're legitimately used sans spaces
-    # (a->b, vector<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.
-    matched = search(r'[^<>=!\s](==|!=|\+=|-=|\*=|/=|/|\|=|&=|<<=|>>=|<=|>=|\|\||\||&&|>>|<<)[^<>=!\s]', line)
-    if not matched:
-        # Note that while it seems that the '<[^<]*' term in the following
-        # regexp could be simplified to '<.*', which would indeed match
-        # the same class of strings, the [^<] means that searching for the
-        # regexp takes linear rather than quadratic time.
-        if not search(r'<[^<]*,\s*$', line):  # template params spill
-            matched = search(r'[^<>=!\s](<)[^<>=!\s]([^>]|->)*$', line)
-    if matched:
-        error(filename, line_number, 'whitespace/operators', 3,
-              'Missing spaces around %s' % matched.group(1))
-
-    # There shouldn't be space around unary operators
-    matched = search(r'(!\s|~\s|[\s]--[\s;]|[\s]\+\+[\s;])', line)
-    if matched:
-        error(filename, line_number, 'whitespace/operators', 4,
-              'Extra space for operator %s' % matched.group(1))
-
-    # A pet peeve of mine: no spaces after an if, while, switch, or for
-    matched = search(r' (if\(|for\(|foreach\(|while\(|switch\()', line)
-    if matched:
-        error(filename, line_number, 'whitespace/parens', 5,
-              'Missing space before ( in %s' % matched.group(1))
-
-    # For if/for/foreach/while/switch, the left and right parens should be
-    # consistent about how many spaces are inside the parens, and
-    # there should either be zero or one spaces inside the parens.
-    # We don't want: "if ( foo)" or "if ( foo   )".
-    # Exception: "for ( ; foo; bar)" and "for (foo; bar; )" are allowed.
-    matched = search(r'\b(if|for|foreach|while|switch)\s*\(([ ]*)(.).*[^ ]+([ ]*)\)\s*{\s*$',
-                     line)
-    if matched:
-        if len(matched.group(2)) != len(matched.group(4)):
-            if not (matched.group(3) == ';'
-                    and len(matched.group(2)) == 1 + len(matched.group(4))
-                    or not matched.group(2) and search(r'\bfor\s*\(.*; \)', line)):
-                error(filename, line_number, 'whitespace/parens', 5,
-                      'Mismatching spaces inside () in %s' % matched.group(1))
-        if not len(matched.group(2)) in [0, 1]:
-            error(filename, line_number, 'whitespace/parens', 5,
-                  'Should have zero or one spaces inside ( and ) in %s' %
-                  matched.group(1))
-
-    # You should always have a space after a comma (either as fn arg or operator)
-    if search(r',[^\s]', line):
-        error(filename, line_number, 'whitespace/comma', 3,
-              'Missing space after ,')
-
-    if filename.endswith('.cpp'):
-        # C++ should have the & or * beside the type not the variable name.
-        matched = match(r'\s*\w+(?<!\breturn)\s+(?P<pointer_operator>\*|\&)\w+', line)
-        if matched:
-            error(filename, line_number, 'whitespace/declaration', 3,
-                  'Declaration has space between type name and %s in %s' % (matched.group('pointer_operator'), matched.group(0).strip()))
-
-    elif filename.endswith('.c'):
-        # C Pointer declaration should have the * beside the variable not the type name.
-        matched = search(r'^\s*\w+\*\s+\w+', line)
-        if matched:
-            error(filename, line_number, 'whitespace/declaration', 3,
-                  'Declaration has space between * and variable name in %s' % matched.group(0).strip())
-
-    # Next we will look for issues with function calls.
-    check_spacing_for_function_call(filename, line, line_number, error)
-
-    # Except after an opening paren, you should have spaces before your braces.
-    # And since you should never have braces at the beginning of a line, this is
-    # an easy test.
-    if search(r'[^ ({]{', line):
-        error(filename, line_number, 'whitespace/braces', 5,
-              'Missing space before {')
-
-    # Make sure '} else {' has spaces.
-    if search(r'}else', line):
-        error(filename, line_number, 'whitespace/braces', 5,
-              'Missing space before else')
-
-    # You shouldn't have spaces before your brackets, except maybe after
-    # 'delete []' or 'new char * []'.
-    if search(r'\w\s+\[', line) and not search(r'delete\s+\[', line):
-        error(filename, line_number, 'whitespace/braces', 5,
-              'Extra space before [')
-
-    # You shouldn't have a space before a semicolon at the end of the line.
-    # There's a special case for "for" since the style guide allows space before
-    # the semicolon there.
-    if search(r':\s*;\s*$', line):
-        error(filename, line_number, 'whitespace/semicolon', 5,
-              'Semicolon defining empty statement. Use { } instead.')
-    elif search(r'^\s*;\s*$', line):
-        error(filename, line_number, 'whitespace/semicolon', 5,
-              'Line contains only semicolon. If this should be an empty statement, '
-              'use { } instead.')
-    elif (search(r'\s+;\s*$', line) and not search(r'\bfor\b', line)):
-        error(filename, line_number, 'whitespace/semicolon', 5,
-              'Extra space before last semicolon. If this should be an empty '
-              'statement, use { } instead.')
-    elif (search(r'\b(for|while)\s*\(.*\)\s*;\s*$', line)
-          and line.count('(') == line.count(')')
-          # Allow do {} while();
-          and not search(r'}\s*while', line)):
-        error(filename, line_number, 'whitespace/semicolon', 5,
-              'Semicolon defining empty statement for this loop. Use { } instead.')
-
-
-def get_previous_non_blank_line(clean_lines, line_number):
-    """Return the most recent non-blank line and its line number.
-
-    Args:
-      clean_lines: A CleansedLines instance containing the file contents.
-      line_number: The number of the line to check.
-
-    Returns:
-      A tuple with two elements.  The first element is the contents of the last
-      non-blank line before the current line, or the empty string if this is the
-      first non-blank line.  The second is the line number of that line, or -1
-      if this is the first non-blank line.
-    """
-
-    previous_line_number = line_number - 1
-    while previous_line_number >= 0:
-        previous_line = clean_lines.elided[previous_line_number]
-        if not is_blank_line(previous_line):     # if not a blank line...
-            return (previous_line, previous_line_number)
-        previous_line_number -= 1
-    return ('', -1)
-
-
-def check_namespace_indentation(filename, clean_lines, line_number, file_extension, file_state, error):
-    """Looks for indentation errors inside of namespaces.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      file_extension: The extension (dot not included) of the file.
-      file_state: A _FileState instance which maintains information about
-                  the state of things in the file.
-      error: The function to call with any errors found.
-    """
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    namespace_match = match(r'(?P<namespace_indentation>\s*)namespace\s+\S+\s*{\s*$', line)
-    if not namespace_match:
-        return
-
-    current_indentation_level = len(namespace_match.group('namespace_indentation'))
-    if current_indentation_level > 0:
-        # Don't warn about an indented namespace if we already warned about indented code.
-        if not file_state.did_inside_namespace_indent_warning():
-            error(filename, line_number, 'whitespace/indent', 4,
-                  'namespace should never be indented.')
-        return
-    looking_for_semicolon = False;
-    line_offset = 0
-    in_preprocessor_directive = False;
-    for current_line in clean_lines.elided[line_number + 1:]:
-        line_offset += 1
-        if not current_line.strip():
-            continue
-        if not current_indentation_level:
-            if not (in_preprocessor_directive or looking_for_semicolon):
-                if not match(r'\S', current_line) and not file_state.did_inside_namespace_indent_warning():
-                    file_state.set_did_inside_namespace_indent_warning()
-                    error(filename, line_number + line_offset, 'whitespace/indent', 4,
-                          'Code inside a namespace should not be indented.')
-            if in_preprocessor_directive or (current_line.strip()[0] == '#'): # This takes care of preprocessor directive syntax.
-                in_preprocessor_directive = current_line[-1] == '\\'
-            else:
-                looking_for_semicolon = ((current_line.find(';') == -1) and (current_line.strip()[-1] != '}')) or (current_line[-1] == '\\')
-        else:
-            looking_for_semicolon = False; # If we have a brace we may not need a semicolon.
-        current_indentation_level += current_line.count('{') - current_line.count('}')
-        if current_indentation_level < 0:
-            break;
-
-def check_using_std(filename, clean_lines, line_number, error):
-    """Looks for 'using std::foo;' statements which should be replaced with 'using namespace std;'.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    # This check doesn't apply to C or Objective-C implementation files.
-    if filename.endswith('.c') or filename.endswith('.m'):
-        return
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    using_std_match = match(r'\s*using\s+std::(?P<method_name>\S+)\s*;\s*$', line)
-    if not using_std_match:
-        return
-
-    method_name = using_std_match.group('method_name')
-    error(filename, line_number, 'build/using_std', 4,
-          "Use 'using namespace std;' instead of 'using std::%s;'." % method_name)
-
-
-def check_max_min_macros(filename, clean_lines, line_number, error):
-    """Looks use of MAX() and MIN() macros that should be replaced with std::max() and std::min().
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    # This check doesn't apply to C or Objective-C implementation files.
-    if filename.endswith('.c') or filename.endswith('.m'):
-        return
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    max_min_macros_search = search(r'\b(?P<max_min_macro>(MAX|MIN))\s*\(', line)
-    if not max_min_macros_search:
-        return
-
-    max_min_macro = max_min_macros_search.group('max_min_macro')
-    max_min_macro_lower = max_min_macro.lower()
-    error(filename, line_number, 'runtime/max_min_macros', 4,
-          'Use std::%s() or std::%s<type>() instead of the %s() macro.'
-          % (max_min_macro_lower, max_min_macro_lower, max_min_macro))
-
-
-def check_switch_indentation(filename, clean_lines, line_number, error):
-    """Looks for indentation errors inside of switch statements.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    switch_match = match(r'(?P<switch_indentation>\s*)switch\s*\(.+\)\s*{\s*$', line)
-    if not switch_match:
-        return
-
-    switch_indentation = switch_match.group('switch_indentation')
-    inner_indentation = switch_indentation + ' ' * 4
-    line_offset = 0
-    encountered_nested_switch = False
-
-    for current_line in clean_lines.elided[line_number + 1:]:
-        line_offset += 1
-
-        # Skip not only empty lines but also those with preprocessor directives.
-        if current_line.strip() == '' or current_line.startswith('#'):
-            continue
-
-        if match(r'\s*switch\s*\(.+\)\s*{\s*$', current_line):
-            # Complexity alarm - another switch statement nested inside the one
-            # that we're currently testing. We'll need to track the extent of
-            # that inner switch if the upcoming label tests are still supposed
-            # to work correctly. Let's not do that; instead, we'll finish
-            # checking this line, and then leave it like that. Assuming the
-            # indentation is done consistently (even if incorrectly), this will
-            # still catch all indentation issues in practice.
-            encountered_nested_switch = True
-
-        current_indentation_match = match(r'(?P<indentation>\s*)(?P<remaining_line>.*)$', current_line);
-        current_indentation = current_indentation_match.group('indentation')
-        remaining_line = current_indentation_match.group('remaining_line')
-
-        # End the check at the end of the switch statement.
-        if remaining_line.startswith('}') and current_indentation == switch_indentation:
-            break
-        # Case and default branches should not be indented. The regexp also
-        # catches single-line cases like "default: break;" but does not trigger
-        # on stuff like "Document::Foo();".
-        elif match(r'(default|case\s+.*)\s*:([^:].*)?$', remaining_line):
-            if current_indentation != switch_indentation:
-                error(filename, line_number + line_offset, 'whitespace/indent', 4,
-                      'A case label should not be indented, but line up with its switch statement.')
-                # Don't throw an error for multiple badly indented labels,
-                # one should be enough to figure out the problem.
-                break
-        # We ignore goto labels at the very beginning of a line.
-        elif match(r'\w+\s*:\s*$', remaining_line):
-            continue
-        # It's not a goto label, so check if it's indented at least as far as
-        # the switch statement plus one more level of indentation.
-        elif not current_indentation.startswith(inner_indentation):
-            error(filename, line_number + line_offset, 'whitespace/indent', 4,
-                  'Non-label code inside switch statements should be indented.')
-            # Don't throw an error for multiple badly indented statements,
-            # one should be enough to figure out the problem.
-            break
-
-        if encountered_nested_switch:
-            break
-
-
-def check_braces(filename, clean_lines, line_number, error):
-    """Looks for misplaced braces (e.g. at the end of line).
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    if match(r'\s*{\s*$', line):
-        # We allow an open brace to start a line in the case where someone
-        # is using braces for function definition or in a block to
-        # explicitly create a new scope, which is commonly used to control
-        # the lifetime of stack-allocated variables.  We don't detect this
-        # perfectly: we just don't complain if the last non-whitespace
-        # character on the previous non-blank line is ';', ':', '{', '}',
-        # ')', or ') const' and doesn't begin with 'if|for|while|switch|else'.
-        # We also allow '#' for #endif and '=' for array initialization.
-        previous_line = get_previous_non_blank_line(clean_lines, line_number)[0]
-        if ((not search(r'[;:}{)=]\s*$|\)\s*const\s*$', previous_line)
-             or search(r'\b(if|for|foreach|while|switch|else)\b', previous_line))
-            and previous_line.find('#') < 0):
-            error(filename, line_number, 'whitespace/braces', 4,
-                  'This { should be at the end of the previous line')
-    elif (search(r'\)\s*(const\s*)?{\s*$', line)
-          and line.count('(') == line.count(')')
-          and not search(r'\b(if|for|foreach|while|switch)\b', line)
-          and not match(r'\s+[A-Z_][A-Z_0-9]+\b', line)):
-        error(filename, line_number, 'whitespace/braces', 4,
-              'Place brace on its own line for function definitions.')
-
-    if (match(r'\s*}\s*(else\s*({\s*)?)?$', line) and line_number > 1):
-        # We check if a closed brace has started a line to see if a
-        # one line control statement was previous.
-        previous_line = clean_lines.elided[line_number - 2]
-        if (previous_line.find('{') > 0
-            and search(r'\b(if|for|foreach|while|else)\b', previous_line)):
-            error(filename, line_number, 'whitespace/braces', 4,
-                  'One line control clauses should not use braces.')
-
-    # An else clause should be on the same line as the preceding closing brace.
-    if match(r'\s*else\s*', line):
-        previous_line = get_previous_non_blank_line(clean_lines, line_number)[0]
-        if match(r'\s*}\s*$', previous_line):
-            error(filename, line_number, 'whitespace/newline', 4,
-                  'An else should appear on the same line as the preceding }')
-
-    # Likewise, an else should never have the else clause on the same line
-    if search(r'\belse [^\s{]', line) and not search(r'\belse if\b', line):
-        error(filename, line_number, 'whitespace/newline', 4,
-              'Else clause should never be on same line as else (use 2 lines)')
-
-    # In the same way, a do/while should never be on one line
-    if match(r'\s*do [^\s{]', line):
-        error(filename, line_number, 'whitespace/newline', 4,
-              'do/while clauses should not be on a single line')
-
-    # Braces shouldn't be followed by a ; unless they're defining a struct
-    # or initializing an array.
-    # We can't tell in general, but we can for some common cases.
-    previous_line_number = line_number
-    while True:
-        (previous_line, previous_line_number) = get_previous_non_blank_line(clean_lines, previous_line_number)
-        if match(r'\s+{.*}\s*;', line) and not previous_line.count(';'):
-            line = previous_line + line
-        else:
-            break
-    if (search(r'{.*}\s*;', line)
-        and line.count('{') == line.count('}')
-        and not search(r'struct|class|enum|\s*=\s*{', line)):
-        error(filename, line_number, 'readability/braces', 4,
-              "You don't need a ; after a }")
-
-
-def check_exit_statement_simplifications(filename, clean_lines, line_number, error):
-    """Looks for else or else-if statements that should be written as an
-    if statement when the prior if concludes with a return, break, continue or
-    goto statement.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    line = clean_lines.elided[line_number] # Get rid of comments and strings.
-
-    else_match = match(r'(?P<else_indentation>\s*)(\}\s*)?else(\s+if\s*\(|(?P<else>\s*(\{\s*)?\Z))', line)
-    if not else_match:
-        return
-
-    else_indentation = else_match.group('else_indentation')
-    inner_indentation = else_indentation + ' ' * 4
-
-    previous_lines = clean_lines.elided[:line_number]
-    previous_lines.reverse()
-    line_offset = 0
-    encountered_exit_statement = False
-
-    for current_line in previous_lines:
-        line_offset -= 1
-
-        # Skip not only empty lines but also those with preprocessor directives
-        # and goto labels.
-        if current_line.strip() == '' or current_line.startswith('#') or match(r'\w+\s*:\s*$', current_line):
-            continue
-
-        # Skip lines with closing braces on the original indentation level.
-        # Even though the styleguide says they should be on the same line as
-        # the "else if" statement, we also want to check for instances where
-        # the current code does not comply with the coding style. Thus, ignore
-        # these lines and proceed to the line before that.
-        if current_line == else_indentation + '}':
-            continue
-
-        current_indentation_match = match(r'(?P<indentation>\s*)(?P<remaining_line>.*)$', current_line);
-        current_indentation = current_indentation_match.group('indentation')
-        remaining_line = current_indentation_match.group('remaining_line')
-
-        # As we're going up the lines, the first real statement to encounter
-        # has to be an exit statement (return, break, continue or goto) -
-        # otherwise, this check doesn't apply.
-        if not encountered_exit_statement:
-            # We only want to find exit statements if they are on exactly
-            # the same level of indentation as expected from the code inside
-            # the block. If the indentation doesn't strictly match then we
-            # might have a nested if or something, which must be ignored.
-            if current_indentation != inner_indentation:
-                break
-            if match(r'(return(\W+.*)|(break|continue)\s*;|goto\s*\w+;)$', remaining_line):
-                encountered_exit_statement = True
-                continue
-            break
-
-        # When code execution reaches this point, we've found an exit statement
-        # as last statement of the previous block. Now we only need to make
-        # sure that the block belongs to an "if", then we can throw an error.
-
-        # Skip lines with opening braces on the original indentation level,
-        # similar to the closing braces check above. ("if (condition)\n{")
-        if current_line == else_indentation + '{':
-            continue
-
-        # Skip everything that's further indented than our "else" or "else if".
-        if current_indentation.startswith(else_indentation) and current_indentation != else_indentation:
-            continue
-
-        # So we've got a line with same (or less) indentation. Is it an "if"?
-        # If yes: throw an error. If no: don't throw an error.
-        # Whatever the outcome, this is the end of our loop.
-        if match(r'if\s*\(', remaining_line):
-            if else_match.start('else') != -1:
-                error(filename, line_number + line_offset, 'readability/control_flow', 4,
-                      'An else statement can be removed when the prior "if" '
-                      'concludes with a return, break, continue or goto statement.')
-            else:
-                error(filename, line_number + line_offset, 'readability/control_flow', 4,
-                      'An else if statement should be written as an if statement '
-                      'when the prior "if" concludes with a return, break, '
-                      'continue or goto statement.')
-        break
-
-
-def replaceable_check(operator, macro, line):
-    """Determine whether a basic CHECK can be replaced with a more specific one.
-
-    For example suggest using CHECK_EQ instead of CHECK(a == b) and
-    similarly for CHECK_GE, CHECK_GT, CHECK_LE, CHECK_LT, CHECK_NE.
-
-    Args:
-      operator: The C++ operator used in the CHECK.
-      macro: The CHECK or EXPECT macro being called.
-      line: The current source line.
-
-    Returns:
-      True if the CHECK can be replaced with a more specific one.
-    """
-
-    # This matches decimal and hex integers, strings, and chars (in that order).
-    match_constant = r'([-+]?(\d+|0[xX][0-9a-fA-F]+)[lLuU]{0,3}|".*"|\'.*\')'
-
-    # Expression to match two sides of the operator with something that
-    # looks like a literal, since CHECK(x == iterator) won't compile.
-    # This means we can't catch all the cases where a more specific
-    # CHECK is possible, but it's less annoying than dealing with
-    # extraneous warnings.
-    match_this = (r'\s*' + macro + r'\((\s*' +
-                  match_constant + r'\s*' + operator + r'[^<>].*|'
-                  r'.*[^<>]' + operator + r'\s*' + match_constant +
-                  r'\s*\))')
-
-    # Don't complain about CHECK(x == NULL) or similar because
-    # CHECK_EQ(x, NULL) won't compile (requires a cast).
-    # Also, don't complain about more complex boolean expressions
-    # involving && or || such as CHECK(a == b || c == d).
-    return match(match_this, line) and not search(r'NULL|&&|\|\|', line)
-
-
-def check_check(filename, clean_lines, line_number, error):
-    """Checks the use of CHECK and EXPECT macros.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      error: The function to call with any errors found.
-    """
-
-    # Decide the set of replacement macros that should be suggested
-    raw_lines = clean_lines.raw_lines
-    current_macro = ''
-    for macro in _CHECK_MACROS:
-        if raw_lines[line_number].find(macro) >= 0:
-            current_macro = macro
-            break
-    if not current_macro:
-        # Don't waste time here if line doesn't contain 'CHECK' or 'EXPECT'
-        return
-
-    line = clean_lines.elided[line_number]        # get rid of comments and strings
-
-    # Encourage replacing plain CHECKs with CHECK_EQ/CHECK_NE/etc.
-    for operator in ['==', '!=', '>=', '>', '<=', '<']:
-        if replaceable_check(operator, current_macro, line):
-            error(filename, line_number, 'readability/check', 2,
-                  'Consider using %s instead of %s(a %s b)' % (
-                      _CHECK_REPLACEMENT[current_macro][operator],
-                      current_macro, operator))
-            break
-
-
-def check_for_comparisons_to_zero(filename, clean_lines, line_number, error):
-    # Get the line without comments and strings.
-    line = clean_lines.elided[line_number]
-
-    # Include NULL here so that users don't have to convert NULL to 0 first and then get this error.
-    if search(r'[=!]=\s*(NULL|0|true|false)\W', line) or search(r'\W(NULL|0|true|false)\s*[=!]=', line):
-        error(filename, line_number, 'readability/comparison_to_zero', 5,
-              'Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons.')
-
-
-def check_for_null(filename, clean_lines, line_number, error):
-    # This check doesn't apply to C or Objective-C implementation files.
-    if filename.endswith('.c') or filename.endswith('.m'):
-        return
-
-    line = clean_lines.elided[line_number]
-    if search(r'\bNULL\b', line):
-        error(filename, line_number, 'readability/null', 5, 'Use 0 instead of NULL.')
-        return
-
-    line = clean_lines.raw_lines[line_number]
-    # See if NULL occurs in any comments in the line. If the search for NULL using the raw line
-    # matches, then do the check with strings collapsed to avoid giving errors for
-    # NULLs occurring in strings.
-    if search(r'\bNULL\b', line) and search(r'\bNULL\b', CleansedLines.collapse_strings(line)):
-        error(filename, line_number, 'readability/null', 4, 'Use 0 instead of NULL.')
-
-def get_line_width(line):
-    """Determines the width of the line in column positions.
-
-    Args:
-      line: A string, which may be a Unicode string.
-
-    Returns:
-      The width of the line in column positions, accounting for Unicode
-      combining characters and wide characters.
-    """
-    if isinstance(line, unicode):
-        width = 0
-        for c in unicodedata.normalize('NFC', line):
-            if unicodedata.east_asian_width(c) in ('W', 'F'):
-                width += 2
-            elif not unicodedata.combining(c):
-                width += 1
-        return width
-    return len(line)
-
-
-def check_style(filename, clean_lines, line_number, file_extension, file_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 4-space indents, line lengths,
-    tab usage, spaces inside code, etc.
-
-    Args:
-      filename: The name of the current file.
-      clean_lines: A CleansedLines instance containing the file.
-      line_number: The number of the line to check.
-      file_extension: The extension (without the dot) of the filename.
-      file_state: A _FileState instance which maintains information about
-                  the state of things in the file.
-      error: The function to call with any errors found.
-    """
-
-    raw_lines = clean_lines.raw_lines
-    line = raw_lines[line_number]
-
-    if line.find('\t') != -1:
-        error(filename, line_number, 'whitespace/tab', 1,
-              'Tab found; better to use spaces')
-
-    # One or three blank spaces at the beginning of the line is weird; it's
-    # hard to reconcile that with 4-space indents.
-    # NOTE: here are the conditions rob pike used for his tests.  Mine aren't
-    # as sophisticated, but it may be worth becoming so:  RLENGTH==initial_spaces
-    # if(RLENGTH > 20) complain = 0;
-    # if(match($0, " +(error|private|public|protected):")) complain = 0;
-    # if(match(prev, "&& *$")) complain = 0;
-    # if(match(prev, "\\|\\| *$")) complain = 0;
-    # if(match(prev, "[\",=><] *$")) complain = 0;
-    # if(match($0, " <<")) complain = 0;
-    # if(match(prev, " +for \\(")) complain = 0;
-    # if(prevodd && match(prevprev, " +for \\(")) complain = 0;
-    initial_spaces = 0
-    cleansed_line = clean_lines.elided[line_number]
-    while initial_spaces < len(line) and line[initial_spaces] == ' ':
-        initial_spaces += 1
-    if line and line[-1].isspace():
-        error(filename, line_number, 'whitespace/end_of_line', 4,
-              'Line ends in whitespace.  Consider deleting these extra spaces.')
-    # There are certain situations we allow one space, notably for labels
-    elif ((initial_spaces >= 1 and initial_spaces <= 3)
-          and not match(r'\s*\w+\s*:\s*$', cleansed_line)):
-        error(filename, line_number, 'whitespace/indent', 3,
-              'Weird number of spaces at line-start.  '
-              'Are you using a 4-space indent?')
-    # Labels should always be indented at least one space.
-    elif not initial_spaces and line[:2] != '//':
-        label_match = match(r'(?P<label>[^:]+):\s*$', line)
-
-        if label_match:
-            label = label_match.group('label')
-            # Only throw errors for stuff that is definitely not a goto label,
-            # because goto labels can in fact occur at the start of the line.
-            if label in ['public', 'private', 'protected'] or label.find(' ') != -1:
-                error(filename, line_number, 'whitespace/labels', 4,
-                      'Labels should always be indented at least one space.  '
-                      'If this is a member-initializer list in a constructor, '
-                      'the colon should be on the line after the definition header.')
-
-    if (cleansed_line.count(';') > 1
-        # for loops are allowed two ;'s (and may run over two lines).
-        and cleansed_line.find('for') == -1
-        and (get_previous_non_blank_line(clean_lines, line_number)[0].find('for') == -1
-             or get_previous_non_blank_line(clean_lines, line_number)[0].find(';') != -1)
-        # It's ok to have many commands in a switch case that fits in 1 line
-        and not ((cleansed_line.find('case ') != -1
-                  or cleansed_line.find('default:') != -1)
-                 and cleansed_line.find('break;') != -1)):
-        error(filename, line_number, 'whitespace/newline', 4,
-              'More than one command on the same line')
-
-    if cleansed_line.strip().endswith('||') or cleansed_line.strip().endswith('&&'):
-        error(filename, line_number, 'whitespace/operators', 4,
-              'Boolean expressions that span multiple lines should have their '
-              'operators on the left side of the line instead of the right side.')
-
-    # Some more style checks
-    check_namespace_indentation(filename, clean_lines, line_number, file_extension, file_state, error)
-    check_using_std(filename, clean_lines, line_number, error)
-    check_max_min_macros(filename, clean_lines, line_number, error)
-    check_switch_indentation(filename, clean_lines, line_number, error)
-    check_braces(filename, clean_lines, line_number, error)
-    check_exit_statement_simplifications(filename, clean_lines, line_number, error)
-    check_spacing(filename, clean_lines, line_number, error)
-    check_check(filename, clean_lines, line_number, error)
-    check_for_comparisons_to_zero(filename, clean_lines, line_number, error)
-    check_for_null(filename, clean_lines, line_number, 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.cpp').group(0) == 'foo'
-#  _RE_FIRST_COMPONENT.match('foo-bar_baz.cpp').group(0) == 'foo'
-#  _RE_FIRST_COMPONENT.match('foo_bar-baz.cpp').group(0) == 'foo'
-_RE_FIRST_COMPONENT = re.compile(r'^[^-_.]+')
-
-
-def _drop_common_suffixes(filename):
-    """Drops common suffixes like _test.cpp or -inl.h from filename.
-
-    For example:
-      >>> _drop_common_suffixes('foo/foo-inl.h')
-      'foo/foo'
-      >>> _drop_common_suffixes('foo/bar/foo.cpp')
-      'foo/bar/foo'
-      >>> _drop_common_suffixes('foo/foo_internal.h')
-      'foo/foo'
-      >>> _drop_common_suffixes('foo/foo_unusualinternal.h')
-      'foo/foo_unusualinternal'
-
-    Args:
-      filename: The input filename.
-
-    Returns:
-      The filename with the common suffix removed.
-    """
-    for suffix in ('test.cpp', 'regtest.cpp', 'unittest.cpp',
-                   '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 _is_test_filename(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.cpp')
-        or filename.endswith('_unittest.cpp')
-        or filename.endswith('_regtest.cpp')):
-        return True
-    return False
-
-
-def _classify_include(filename, include, is_system, include_state):
-    """Figures out what kind of header 'include' is.
-
-    Args:
-      filename: The current file cpp_style is running over.
-      include: The path to a #included file.
-      is_system: True if the #include used <> rather than "".
-      include_state: An _IncludeState instance in which the headers are inserted.
-
-    Returns:
-      One of the _XXX_HEADER constants.
-
-    For example:
-      >>> _classify_include('foo.cpp', 'config.h', False)
-      _CONFIG_HEADER
-      >>> _classify_include('foo.cpp', 'foo.h', False)
-      _PRIMARY_HEADER
-      >>> _classify_include('foo.cpp', 'bar.h', False)
-      _OTHER_HEADER
-    """
-
-    # If it is a system header we know it is classified as _OTHER_HEADER.
-    if is_system:
-        return _OTHER_HEADER
-
-    # If the include is named config.h then this is WebCore/config.h.
-    if include == "config.h":
-        return _CONFIG_HEADER
-
-    # There cannot be primary includes in header files themselves. Only an
-    # include exactly matches the header filename will be is flagged as
-    # primary, so that it triggers the "don't include yourself" check.
-    if filename.endswith('.h') and filename != include:
-        return _OTHER_HEADER;
-
-    # If the target file basename starts with the include we're checking
-    # then we consider it the primary header.
-    target_base = FileInfo(filename).base_name()
-    include_base = FileInfo(include).base_name()
-
-    # If we haven't encountered a primary header, then be lenient in checking.
-    if not include_state.visited_primary_section() and target_base.find(include_base) != -1:
-        return _PRIMARY_HEADER
-    # If we already encountered a primary header, perform a strict comparison.
-    # In case the two filename bases are the same then the above lenient check
-    # probably was a false positive.
-    elif include_state.visited_primary_section() and target_base == include_base:
-        return _PRIMARY_HEADER
-
-    return _OTHER_HEADER
-
-
-
-def check_include_line(filename, clean_lines, line_number, 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.
-      line_number: 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.
-    """
-
-    line = clean_lines.lines[line_number]
-
-    matched = _RE_PATTERN_INCLUDE.search(line)
-    if not matched:
-        return
-
-    include = matched.group(2)
-    is_system = (matched.group(1) == '<')
-
-    # Look for any of the stream classes that are part of standard C++.
-    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 _is_test_filename(filename):
-            error(filename, line_number, 'readability/streams', 3,
-                  'Streams are highly discouraged.')
-
-    # Look for specific includes to fix.
-    if include.startswith('wtf/') and not is_system:
-        error(filename, line_number, 'build/include', 4,
-              'wtf includes should be <wtf/file.h> instead of "wtf/file.h".')
-
-    duplicate_header = include in include_state
-    if duplicate_header:
-        error(filename, line_number, 'build/include', 4,
-              '"%s" already included at %s:%s' %
-              (include, filename, include_state[include]))
-    else:
-        include_state[include] = line_number
-
-    header_type = _classify_include(filename, include, is_system, include_state)
-    include_state.header_types[line_number] = header_type
-
-    # Only proceed if this isn't a duplicate header.
-    if duplicate_header:
-        return
-
-    # We want to ensure that headers appear in the right order:
-    # 1) for implementation files: config.h, primary header, blank line, alphabetically sorted
-    # 2) for header files: alphabetically sorted
-    # The include_state object keeps track of the last type seen
-    # and complains if the header types are out of order or missing.
-    error_message = include_state.check_next_include_order(header_type, filename.endswith('.h'))
-
-    # Check to make sure we have a blank line after primary header.
-    if not error_message and header_type == _PRIMARY_HEADER:
-         next_line = clean_lines.raw_lines[line_number + 1]
-         if not is_blank_line(next_line):
-            error(filename, line_number, 'build/include_order', 4,
-                  'You should add a blank line after implementation file\'s own header.')
-
-    # Check to make sure all headers besides config.h and the primary header are
-    # alphabetically sorted.
-    if not error_message and header_type == _OTHER_HEADER:
-         previous_line_number = line_number - 1;
-         previous_line = clean_lines.lines[previous_line_number]
-         previous_match = _RE_PATTERN_INCLUDE.search(previous_line)
-         while (not previous_match and previous_line_number > 0
-                and not search(r'\A(#if|#ifdef|#ifndef|#else|#elif|#endif)', previous_line)):
-            previous_line_number -= 1;
-            previous_line = clean_lines.lines[previous_line_number]
-            previous_match = _RE_PATTERN_INCLUDE.search(previous_line)
-         if previous_match:
-            previous_header_type = include_state.header_types[previous_line_number]
-            if previous_header_type == _OTHER_HEADER and previous_line.strip() > line.strip():
-                error(filename, line_number, 'build/include_order', 4,
-                      'Alphabetical sorting problem.')
-
-    if error_message:
-        if filename.endswith('.h'):
-            error(filename, line_number, 'build/include_order', 4,
-                  '%s Should be: alphabetically sorted.' %
-                  error_message)
-        else:
-            error(filename, line_number, 'build/include_order', 4,
-                  '%s Should be: config.h, primary header, blank line, and then alphabetically sorted.' %
-                  error_message)
-
-
-def check_language(filename, clean_lines, line_number, 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.
-      line_number: 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[line_number]
-    if not line:
-        return
-
-    matched = _RE_PATTERN_INCLUDE.search(line)
-    if matched:
-        check_include_line(filename, clean_lines, line_number, include_state, error)
-        return
-
-    # FIXME: figure out if they're using default arguments in fn proto.
-
-    # 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.
-    matched = search(
-        r'\b(int|float|double|bool|char|int32|uint32|int64|uint64)\([^)]', line)
-    if matched:
-        # 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.
-        if not match(r'^\s*MOCK_(CONST_)?METHOD\d+(_T)?\(', line):
-            error(filename, line_number, 'readability/casting', 4,
-                  'Using deprecated casting style.  '
-                  'Use static_cast<%s>(...) instead' %
-                  matched.group(1))
-
-    check_c_style_cast(filename, line_number, line, clean_lines.raw_lines[line_number],
-                       '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".
-    check_c_style_cast(filename, line_number, line, clean_lines.raw_lines[line_number],
-                       '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, line_number, '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.
-    matched = 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 matched and not match(r'\s*(<.*>)?(::[a-zA-Z0-9_]+)?\s*\(([^"]|$)',
-                             matched.group(3)):
-        error(filename, line_number, 'runtime/string', 4,
-              'For a static/global string constant, use a C style string instead: '
-              '"%schar %s[]".' %
-              (matched.group(1), matched.group(2)))
-
-    # Check that we're not using RTTI outside of testing code.
-    if search(r'\bdynamic_cast<', line) and not _is_test_filename(filename):
-        error(filename, line_number, '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, line_number, 'runtime/init', 4,
-              'You seem to be initializing a member variable with itself.')
-
-    if file_extension == 'h':
-        # FIXME: check that 1-arg constructors are explicit.
-        #        How to tell it's a constructor?
-        #        (handled in check_for_non_standard_constructs for now)
-        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, line_number, 'runtime/int', 4,
-                  'Use "unsigned short" for ports, not "short"')
-
-    # When snprintf is used, the second argument shouldn't be a literal.
-    matched = search(r'snprintf\s*\(([^,]*),\s*([0-9]*)\s*,', line)
-    if matched:
-        error(filename, line_number, 'runtime/printf', 3,
-              'If you can, use sizeof(%s) instead of %s as the 2nd arg '
-              'to snprintf.' % (matched.group(1), matched.group(2)))
-
-    # Check if some verboten C functions are being used.
-    if search(r'\bsprintf\b', line):
-        error(filename, line_number, 'runtime/printf', 5,
-              'Never use sprintf.  Use snprintf instead.')
-    matched = search(r'\b(strcpy|strcat)\b', line)
-    if matched:
-        error(filename, line_number, 'runtime/printf', 4,
-              'Almost always, snprintf is better than %s' % matched.group(1))
-
-    if search(r'\bsscanf\b', line):
-        error(filename, line_number, 'runtime/printf', 1,
-              'sscanf can be ok, but is slow and can overflow buffers.')
-
-    # Check for suspicious usage of "if" like
-    # } if (a == b) {
-    if search(r'\}\s*if\s*\(', line):
-        error(filename, line_number, '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())
-    matched = re.search(r'\b((?:string)?printf)\s*\(([\w.\->()]+)\)', line, re.I)
-    if matched:
-        error(filename, line_number, 'runtime/printf', 4,
-              'Potential format string bug. Do %s("%%s", %s) instead.'
-              % (matched.group(1), matched.group(2)))
-
-    # Check for potential memset bugs like memset(buf, sizeof(buf), 0).
-    matched = search(r'memset\s*\(([^,]*),\s*([^,]*),\s*0\s*\)', line)
-    if matched and not match(r"^''|-?[0-9]+|0x[0-9A-Fa-f]$", matched.group(2)):
-        error(filename, line_number, 'runtime/memset', 4,
-              'Did you mean "memset(%s, 0, %s)"?'
-              % (matched.group(1), matched.group(2)))
-
-    # Detect variable-length arrays.
-    matched = match(r'\s*(.+::)?(\w+) [a-z]\w*\[(.+)];', line)
-    if (matched and matched.group(2) != 'return' and matched.group(2) != 'delete' and
-        matched.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|\+|\-|\*|\/|<<|>>]', matched.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 becasue we split on ' ' and '*'.
-            if tok.startswith('sizeof'):
-                skip_next = True
-                continue
-            is_const = False
-            break
-        if not is_const:
-            error(filename, line_number, 'runtime/arrays', 1,
-                  'Do not use variable-length arrays.  Use an appropriately named '
-                  "('k' followed by CamelCase) compile-time constant for the size.")
-
-    # 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, line_number, '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.')
-
-    check_identifier_name_in_declaration(filename, line_number, line, error)
-
-
-def check_identifier_name_in_declaration(filename, line_number, line, error):
-    """Checks if identifier names contain any underscores.
-
-    As identifiers in libraries we are using have a bunch of
-    underscores, we only warn about the declarations of identifiers
-    and don't check use of identifiers.
-
-    Args:
-      filename: The name of the current file.
-      line_number: The number of the line to check.
-      line: The line of code to check.
-      error: The function to call with any errors found.
-    """
-    # We don't check a return statement.
-    if match(r'\s*return\b', line):
-        return
-
-    # Basically, a declaration is a type name followed by whitespaces
-    # followed by an identifier. The type name can be complicated
-    # due to type adjectives and templates. We remove them first to
-    # simplify the process to find declarations of identifiers.
-
-    # Convert "long long", "long double", and "long long int" to
-    # simple types, but don't remove simple "long".
-    line = sub(r'long (long )?(?=long|double|int)', '', line)
-    line = sub(r'\b(unsigned|signed|inline|using|static|const|volatile|auto|register|extern|typedef|restrict|struct|class|virtual)(?=\W)', '', line)
-
-    # Remove all template parameters by removing matching < and >.
-    # Loop until no templates are removed to remove nested templates.
-    while True:
-        line, number_of_replacements = subn(r'<([\w\s:]|::)+\s*[*&]*\s*>', '', line)
-        if not number_of_replacements:
-            break
-
-    # Declarations of local variables can be in condition expressions
-    # of control flow statements (e.g., "if (RenderObject* p = o->parent())").
-    # We remove the keywords and the first parenthesis.
-    #
-    # Declarations in "while", "if", and "switch" are different from
-    # other declarations in two aspects:
-    #
-    # - There can be only one declaration between the parentheses.
-    #   (i.e., you cannot write "if (int i = 0, j = 1) {}")
-    # - The variable must be initialized.
-    #   (i.e., you cannot write "if (int i) {}")
-    #
-    # and we will need different treatments for them.
-    line = sub(r'^\s*for\s*\(', '', line)
-    line, control_statement = subn(r'^\s*(while|else if|if|switch)\s*\(', '', line)
-
-    # Detect variable and functions.
-    type_regexp = r'\w([\w]|\s*[*&]\s*|::)+'
-    identifier_regexp = r'(?P<identifier>[\w:]+)'
-    character_after_identifier_regexp = r'(?P<character_after_identifier>[[;()=,])(?!=)'
-    declaration_without_type_regexp = r'\s*' + identifier_regexp + r'\s*' + character_after_identifier_regexp
-    declaration_with_type_regexp = r'\s*' + type_regexp + r'\s' + declaration_without_type_regexp
-    is_function_arguments = False
-    number_of_identifiers = 0
-    while True:
-        # If we are seeing the first identifier or arguments of a
-        # function, there should be a type name before an identifier.
-        if not number_of_identifiers or is_function_arguments:
-            declaration_regexp = declaration_with_type_regexp
-        else:
-            declaration_regexp = declaration_without_type_regexp
-
-        matched = match(declaration_regexp, line)
-        if not matched:
-            return
-        identifier = matched.group('identifier')
-        character_after_identifier = matched.group('character_after_identifier')
-
-        # If we removed a non-for-control statement, the character after
-        # the identifier should be '='. With this rule, we can avoid
-        # warning for cases like "if (val & INT_MAX) {".
-        if control_statement and character_after_identifier != '=':
-            return
-
-        is_function_arguments = is_function_arguments or character_after_identifier == '('
-
-        # Remove "m_" and "s_" to allow them.
-        modified_identifier = sub(r'(^|(?<=::))[ms]_', '', identifier)
-        if modified_identifier.find('_') >= 0:
-            # Various exceptions to the rule: JavaScript op codes functions, const_iterator.
-            if (not (filename.find('JavaScriptCore') >= 0 and modified_identifier.find('_op_') >= 0)
-                and not modified_identifier == "const_iterator"):
-                error(filename, line_number, 'readability/naming', 4, identifier + " is incorrectly named. Don't use underscores in your identifier names.")
-
-        # There can be only one declaration in non-for-control statements.
-        if control_statement:
-            return
-        # We should continue checking if this is a function
-        # declaration because we need to check its arguments.
-        # Also, we need to check multiple declarations.
-        if character_after_identifier != '(' and character_after_identifier != ',':
-            return
-
-        number_of_identifiers += 1
-        line = line[matched.end():]
-
-
-def check_c_style_cast(filename, line_number, 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.
-      line_number: 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 or static_cast, depending.
-      pattern: The regular expression used to find C-style casts.
-      error: The function to call with any errors found.
-    """
-    matched = search(pattern, line)
-    if not matched:
-        return
-
-    # e.g., sizeof(int)
-    sizeof_match = match(r'.*sizeof\s*$', line[0:matched.start(1) - 1])
-    if sizeof_match:
-        error(filename, line_number, 'runtime/sizeof', 1,
-              'Using sizeof(type).  Use sizeof(varname) instead if possible')
-        return
-
-    remainder = line[matched.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) = ...
-    #
-    # 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 raw_line.find('/*') < 0):
-            error(filename, line_number, 'readability/function', 3,
-                  'All parameters should be named in a function')
-        return
-
-    # At this point, all that should be left is actual casts.
-    error(filename, line_number, 'readability/casting', 4,
-          'Using C-style cast.  Use %s<%s>(...) instead' %
-          (cast_type, matched.group(1)))
-
-
-_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',)),
-    )
-
-_HEADERS_ACCEPTED_BUT_NOT_PROMOTED = {
-    # We can trust with reasonable confidence that map gives us pair<>, too.
-    'pair<>': ('map', 'multimap', 'hash_map', 'hash_multimap')
-}
-
-_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 files_belong_to_same_module(filename_cpp, 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.cpp, foo_test.cpp and foo_unittest.cpp 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_cpp contains a longer path than the filename_h, for example,
-    '/absolute/path/to/base/sysinfo.cpp', 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.cpp 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_cpp: is the path for the .cpp file
-      filename_h: is the path for the header path
-
-    Returns:
-      Tuple with a bool and a string:
-      bool: True if filename_cpp and filename_h belong to the same module.
-      string: the additional prefix needed to open the header file.
-    """
-
-    if not filename_cpp.endswith('.cpp'):
-        return (False, '')
-    filename_cpp = filename_cpp[:-len('.cpp')]
-    if filename_cpp.endswith('_unittest'):
-        filename_cpp = filename_cpp[:-len('_unittest')]
-    elif filename_cpp.endswith('_test'):
-        filename_cpp = filename_cpp[:-len('_test')]
-    filename_cpp = filename_cpp.replace('/public/', '/')
-    filename_cpp = filename_cpp.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_cpp.endswith(filename_h)
-    common_path = ''
-    if files_belong_to_same_module:
-        common_path = filename_cpp[:-len(filename_h)]
-    return files_belong_to_same_module, common_path
-
-
-def update_include_state(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.
-    """
-    header_file = None
-    try:
-        header_file = io.open(filename, 'r', 'utf8', 'replace')
-    except IOError:
-        return False
-    line_number = 0
-    for line in header_file:
-        line_number += 1
-        clean_line = cleanse_comments(line)
-        matched = _RE_PATTERN_INCLUDE.search(clean_line)
-        if matched:
-            include = matched.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, line_number))
-    return True
-
-
-def check_for_include_what_you_use(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 line_number and the template entity.
-        # Example of required: { '<functional>': (1219, 'less<>') }
-
-    for line_number in xrange(clean_lines.num_lines()):
-        line = clean_lines.elided[line_number]
-        if not line or line[0] == '#':
-            continue
-
-        # String is special -- it is a non-templatized type in STL.
-        if _RE_PATTERN_STRING.search(line):
-            required['<string>'] = (line_number, 'string')
-
-        for pattern, template, header in _re_pattern_algorithm_header:
-            if pattern.search(line):
-                required[header] = (line_number, 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] = (line_number, template)
-
-    # The policy is that if you #include something in foo.h you don't need to
-    # include it again in foo.cpp. 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 = os.path.abspath(filename)
-
-    # For Emacs's flymake.
-    # If cpp_style is invoked from Emacs's flymake, a temporary file is generated
-    # by flymake and that file name might end with '_flymake.cpp'. 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.cpp', we should search for 'foo.h'
-    # instead of 'foo_flymake.h'
-    emacs_flymake_suffix = '_flymake.cpp'
-    if abs_filename.endswith(emacs_flymake_suffix):
-        abs_filename = abs_filename[:-len(emacs_flymake_suffix)] + '.cpp'
-
-    # include_state is modified during iteration, so we iterate over a copy of
-    # the keys.
-    for header in include_state.keys():  #NOLINT
-        (same_module, common_path) = files_belong_to_same_module(abs_filename, header)
-        fullpath = common_path + header
-        if same_module and update_include_state(fullpath, include_state, io):
-            header_found = True
-
-    # If we can't find the header file for a .cpp, 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.
-    # FIXME: 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('.cpp') 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 template in _HEADERS_ACCEPTED_BUT_NOT_PROMOTED:
-            headers = _HEADERS_ACCEPTED_BUT_NOT_PROMOTED[template]
-            if [True for header in headers if header in include_state]:
-                continue
-        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)
-
-
-def process_line(filename, file_extension,
-                 clean_lines, line, include_state, function_state,
-                 class_state, file_state, error):
-    """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.
-      file_state: A _FileState instance which maintains information about
-                  the state of things in the file.
-      error: A callable to which errors are reported, which takes 4 arguments:
-             filename, line number, error level, and message
-
-    """
-    raw_lines = clean_lines.raw_lines
-    check_for_function_lengths(filename, clean_lines, line, function_state, error)
-    if search(r'\bNOLINT\b', raw_lines[line]):  # ignore nolint lines
-        return
-    check_for_multiline_comments_and_strings(filename, clean_lines, line, error)
-    check_style(filename, clean_lines, line, file_extension, file_state, error)
-    check_language(filename, clean_lines, line, file_extension, include_state,
-                   error)
-    check_for_non_standard_constructs(filename, clean_lines, line,
-                                      class_state, error)
-    check_posix_threading(filename, clean_lines, line, error)
-    check_invalid_increment(filename, clean_lines, line, error)
-
-
-def process_file_data(filename, file_extension, lines, error):
-    """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 termined with a newline.
-      error: A callable to which errors are reported, which takes 4 arguments:
-    """
-    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()
-    file_state = _FileState()
-
-    check_for_copyright(filename, lines, error)
-
-    if file_extension == 'h':
-        check_for_header_guard(filename, lines, error)
-
-    remove_multi_line_comments(filename, lines, error)
-    clean_lines = CleansedLines(lines)
-    for line in xrange(clean_lines.num_lines()):
-        process_line(filename, file_extension, clean_lines, line,
-                     include_state, function_state, class_state, file_state, error)
-    class_state.check_finished(filename, error)
-
-    check_for_include_what_you_use(filename, clean_lines, include_state, error)
-
-    # We check here rather than inside process_line so that we see raw
-    # lines rather than "cleaned" lines.
-    check_for_unicode_replacement_characters(filename, lines, error)
-
-    check_for_new_line_at_eof(filename, lines, error)
-
-
-def process_file(filename, error=error):
-    """Performs cpp_style on a single file.
-
-    Args:
-      filename: The name of the file to parse.
-      error: The function to call with any errors found.
-    """
-    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 line_number in range(len(lines)):
-            if lines[line_number].endswith('\r'):
-                lines[line_number] = lines[line_number].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 cpp_style tests
-    # should rely on the extension.
-    if (filename != '-' and file_extension != 'h' and file_extension != 'cpp'
-        and file_extension != 'c'):
-        sys.stderr.write('Ignoring %s; not a .cpp, .c or .h file\n' % filename)
-    else:
-        process_file_data(filename, file_extension, lines, error)
-        if carriage_return_found and os.linesep != '\r\n':
-            # Use 0 for line_number since outputing 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')
-
-
-def print_usage(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 print_categories():
-    """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(_ERROR_CATEGORIES)
-    sys.exit(0)
-
-
-def parse_arguments(args, additional_flags=[]):
-    """Parses the command line arguments.
-
-    This may set the output format and verbosity level as side-effects.
-
-    Args:
-      args: The command line arguments:
-      additional_flags: A list of strings which specifies flags we allow.
-
-    Returns:
-      A tuple of (filenames, flags)
-
-      filenames: The list of filenames to lint.
-      flags: The dict of the flag names and the flag values.
-    """
-    flags = ['help', 'output=', 'verbose=', 'filter='] + additional_flags
-    additional_flag_values = {}
-    try:
-        (opts, filenames) = getopt.getopt(args, '', flags)
-    except getopt.GetoptError:
-        print_usage('Invalid arguments.')
-
-    verbosity = _verbose_level()
-    output_format = _output_format()
-    filters = ''
-
-    for (opt, val) in opts:
-        if opt == '--help':
-            print_usage(None)
-        elif opt == '--output':
-            if not val in ('emacs', 'vs7'):
-                print_usage('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:
-                print_categories()
-        else:
-            additional_flag_values[opt] = val
-
-    _set_output_format(output_format)
-    _set_verbose_level(verbosity)
-    _set_filters(filters)
-
-    return (filenames, additional_flag_values)
-
-
-def use_webkit_styles():
-    """Disables some features which are not suitable for WebKit."""
-    # FIXME: For filters we will never want to have, remove them.
-    #        For filters we want to have similar functionalities,
-    #        modify the implementation and enable them.
-    global _DEFAULT_FILTERS
-    _DEFAULT_FILTERS = [
-        '-whitespace/end_of_line',
-        '-whitespace/comments',
-        '-whitespace/blank_line',
-        '-runtime/explicit',  # explicit
-        '-runtime/virtual',  # virtual dtor
-        '-runtime/printf',
-        '-runtime/threadsafe_fn',
-        '-runtime/rtti',
-        '-build/include_what_you_use',  # <string> for std::string
-        '-legal/copyright',
-        '-readability/multiline_comment',
-        '-readability/braces',  # int foo() {};
-        '-readability/fn_size',
-        '-build/storage_class',  # const static
-        '-build/endif_comment',
-        '-whitespace/labels',
-        '-runtime/arrays',  # variable length array
-        '-build/header_guard',
-        '-readability/casting',
-        '-readability/function',
-        '-runtime/casting',
-        '-runtime/sizeof',
-    ]
-
-
-def main():
-    sys.stderr.write(
-        '''********************* WARNING WARNING WARNING *********************
-
-This tool is in the process of development and may give inaccurate
-results at present.  Please file bugs (and/or patches) for things
-that you notice that it flags incorrectly.
-
-********************* WARNING WARNING WARNING *********************
-
-''')
-
-    use_webkit_styles()
-
-    (filenames, flags) = parse_arguments(sys.argv[1:])
-    if not filenames:
-        print_usage('No files were specified.')
-
-    # 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')
-
-    _cpp_style_state.reset_error_count()
-    for filename in filenames:
-        process_file(filename)
-    sys.stderr.write('Total errors found: %d\n' % _cpp_style_state.error_count)
-    sys.exit(_cpp_style_state.error_count > 0)
-
-
-if __name__ == '__main__':
-    main()