cpplint.py 236 KB
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#!/usr/bin/env python
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#
# Copyright (c) 2009 Google 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.

"""Does google-lint on c++ files.

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

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

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


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

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

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

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

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

  Flags:

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

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

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

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

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

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

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

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

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

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

      Examples:
        --linelength=120

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

      Examples:
        --extensions=hpp,cpp
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    cpplint.py supports per-directory configurations specified in CPPLINT.cfg
    files. CPPLINT.cfg file can contain a number of key=value pairs.
    Currently the following options are supported:

      set noparent
      filter=+filter1,-filter2,...
      exclude_files=regex
      linelength=80

    "set noparent" option prevents cpplint from traversing directory tree
    upwards looking for more .cfg files in parent directories. This option
    is usually placed in the top-level project directory.

    The "filter" option is similar in function to --filter flag. It specifies
    message filters in addition to the |_DEFAULT_FILTERS| and those specified
    through --filter command-line flag.

    "exclude_files" allows to specify a regular expression to be matched against
    a file name. If the expression matches, the file is skipped and not run
    through liner.

    "linelength" allows to specify the allowed line length for the project.

    CPPLINT.cfg has an effect on files in the same directory and all
    sub-directories, unless overridden by a nested configuration file.

      Example file:
        filter=-build/include_order,+build/include_alpha
        exclude_files=.*\.cc

    The above example disables build/include_order warning and enables
    build/include_alpha as well as excludes all .cc from being
    processed by linter, in the current directory (where the .cfg
    file is located) and all sub-directories.
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"""

# We categorize each error message we print.  Here are the categories.
# We want an explicit list so we can list them all in cpplint --filter=.
# If you add a new error message with a new category, add it to the list
# here!  cpplint_unittest.py should tell you if you forget to do this.
_ERROR_CATEGORIES = [
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    'build/class',
    'build/c++11',
    'build/deprecated',
    'build/endif_comment',
    'build/explicit_make_pair',
    'build/forward_decl',
    'build/header_guard',
    'build/include',
    'build/include_alpha',
    'build/include_order',
    'build/include_what_you_use',
    'build/namespaces',
    'build/printf_format',
    'build/storage_class',
    'legal/copyright',
    'readability/alt_tokens',
    'readability/braces',
    'readability/casting',
    'readability/check',
    'readability/constructors',
    'readability/fn_size',
    'readability/function',
    'readability/inheritance',
    'readability/multiline_comment',
    'readability/multiline_string',
    'readability/namespace',
    'readability/nolint',
    'readability/nul',
    'readability/strings',
    'readability/todo',
    'readability/utf8',
    'runtime/arrays',
    'runtime/casting',
    'runtime/explicit',
    'runtime/int',
    'runtime/init',
    'runtime/invalid_increment',
    'runtime/member_string_references',
    'runtime/memset',
    'runtime/indentation_namespace',
    'runtime/operator',
    'runtime/printf',
    'runtime/printf_format',
    'runtime/references',
    'runtime/string',
    'runtime/threadsafe_fn',
    'runtime/vlog',
    'whitespace/blank_line',
    'whitespace/braces',
    'whitespace/comma',
    'whitespace/comments',
    'whitespace/empty_conditional_body',
    'whitespace/empty_loop_body',
    'whitespace/end_of_line',
    'whitespace/ending_newline',
    'whitespace/forcolon',
    'whitespace/indent',
    'whitespace/line_length',
    'whitespace/newline',
    'whitespace/operators',
    'whitespace/parens',
    'whitespace/semicolon',
    'whitespace/tab',
    'whitespace/todo',
    ]

# These error categories are no longer enforced by cpplint, but for backwards-
# compatibility they may still appear in NOLINT comments.
_LEGACY_ERROR_CATEGORIES = [
    'readability/streams',
    ]

# The default state of the category filter. This is overridden by the --filter=
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# 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 = ['-build/include_alpha']

# We used to check for high-bit characters, but after much discussion we
# decided those were OK, as long as they were in UTF-8 and didn't represent
# hard-coded international strings, which belong in a separate i18n file.

# C++ headers
_CPP_HEADERS = frozenset([
    # Legacy
    'algobase.h',
    'algo.h',
    'alloc.h',
    'builtinbuf.h',
    'bvector.h',
    'complex.h',
    'defalloc.h',
    'deque.h',
    'editbuf.h',
    'fstream.h',
    'function.h',
    'hash_map',
    'hash_map.h',
    'hash_set',
    'hash_set.h',
    'hashtable.h',
    'heap.h',
    'indstream.h',
    'iomanip.h',
    'iostream.h',
    'istream.h',
    'iterator.h',
    'list.h',
    'map.h',
    'multimap.h',
    'multiset.h',
    'ostream.h',
    'pair.h',
    'parsestream.h',
    'pfstream.h',
    'procbuf.h',
    'pthread_alloc',
    'pthread_alloc.h',
    'rope',
    'rope.h',
    'ropeimpl.h',
    'set.h',
    'slist',
    'slist.h',
    'stack.h',
    'stdiostream.h',
    'stl_alloc.h',
    'stl_relops.h',
    'streambuf.h',
    'stream.h',
    'strfile.h',
    'strstream.h',
    'tempbuf.h',
    'tree.h',
    'type_traits.h',
    'vector.h',
    # 17.6.1.2 C++ library headers
    'algorithm',
    'array',
    'atomic',
    'bitset',
    'chrono',
    'codecvt',
    'complex',
    'condition_variable',
    'deque',
    'exception',
    'forward_list',
    'fstream',
    'functional',
    'future',
    'initializer_list',
    'iomanip',
    'ios',
    'iosfwd',
    'iostream',
    'istream',
    'iterator',
    'limits',
    'list',
    'locale',
    'map',
    'memory',
    'mutex',
    'new',
    'numeric',
    'ostream',
    'queue',
    'random',
    'ratio',
    'regex',
    'set',
    'sstream',
    'stack',
    'stdexcept',
    'streambuf',
    'string',
    'strstream',
    'system_error',
    'thread',
    'tuple',
    'typeindex',
    'typeinfo',
    'type_traits',
    'unordered_map',
    'unordered_set',
    'utility',
    'valarray',
    'vector',
    # 17.6.1.2 C++ headers for C library facilities
    'cassert',
    'ccomplex',
    'cctype',
    'cerrno',
    'cfenv',
    'cfloat',
    'cinttypes',
    'ciso646',
    'climits',
    'clocale',
    'cmath',
    'csetjmp',
    'csignal',
    'cstdalign',
    'cstdarg',
    'cstdbool',
    'cstddef',
    'cstdint',
    'cstdio',
    'cstdlib',
    'cstring',
    'ctgmath',
    'ctime',
    'cuchar',
    'cwchar',
    'cwctype',
    ])

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# These headers are excluded from [build/include] and [build/include_order]
# checks:
# - Anything not following google file name conventions (containing an
#   uppercase character, such as Python.h or nsStringAPI.h, for example).
# - Lua headers.
_THIRD_PARTY_HEADERS_PATTERN = re.compile(
    r'^(?:[^/]*[A-Z][^/]*\.h|lua\.h|lauxlib\.h|lualib\.h)$')


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# 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

# Alternative tokens and their replacements.  For full list, see section 2.5
# Alternative tokens [lex.digraph] in the C++ standard.
#
# Digraphs (such as '%:') are not included here since it's a mess to
# match those on a word boundary.
_ALT_TOKEN_REPLACEMENT = {
    'and': '&&',
    'bitor': '|',
    'or': '||',
    'xor': '^',
    'compl': '~',
    'bitand': '&',
    'and_eq': '&=',
    'or_eq': '|=',
    'xor_eq': '^=',
    'not': '!',
    'not_eq': '!='
    }

# Compile regular expression that matches all the above keywords.  The "[ =()]"
# bit is meant to avoid matching these keywords outside of boolean expressions.
#
# False positives include C-style multi-line comments and multi-line strings
# but those have always been troublesome for cpplint.
_ALT_TOKEN_REPLACEMENT_PATTERN = re.compile(
    r'[ =()](' + ('|'.join(_ALT_TOKEN_REPLACEMENT.keys())) + r')(?=[ (]|$)')


# These constants define types of headers for use with
# _IncludeState.CheckNextIncludeOrder().
_C_SYS_HEADER = 1
_CPP_SYS_HEADER = 2
_LIKELY_MY_HEADER = 3
_POSSIBLE_MY_HEADER = 4
_OTHER_HEADER = 5

# These constants define the current inline assembly state
_NO_ASM = 0       # Outside of inline assembly block
_INSIDE_ASM = 1   # Inside inline assembly block
_END_ASM = 2      # Last line of inline assembly block
_BLOCK_ASM = 3    # The whole block is an inline assembly block

# Match start of assembly blocks
_MATCH_ASM = re.compile(r'^\s*(?:asm|_asm|__asm|__asm__)'
                        r'(?:\s+(volatile|__volatile__))?'
                        r'\s*[{(]')


_regexp_compile_cache = {}

# {str, set(int)}: a map from error categories to sets of linenumbers
# on which those errors are expected and should be suppressed.
_error_suppressions = {}

# The root directory used for deriving header guard CPP variable.
# This is set by --root flag.
_root = None

# The allowed line length of files.
# This is set by --linelength flag.
_line_length = 80

# The allowed extensions for file names
# This is set by --extensions flag.
_valid_extensions = set(['cc', 'h', 'cpp', 'cu', 'cuh'])

def ParseNolintSuppressions(filename, raw_line, linenum, error):
  """Updates the global list of error-suppressions.

  Parses any NOLINT comments on the current line, updating the global
  error_suppressions store.  Reports an error if the NOLINT comment
  was malformed.

  Args:
    filename: str, the name of the input file.
    raw_line: str, the line of input text, with comments.
    linenum: int, the number of the current line.
    error: function, an error handler.
  """
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  matched = Search(r'\bNOLINT(NEXTLINE)?\b(\([^)]+\))?', raw_line)
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  if matched:
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    if matched.group(1):
      suppressed_line = linenum + 1
    else:
      suppressed_line = linenum
    category = matched.group(2)
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    if category in (None, '(*)'):  # => "suppress all"
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      _error_suppressions.setdefault(None, set()).add(suppressed_line)
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    else:
      if category.startswith('(') and category.endswith(')'):
        category = category[1:-1]
        if category in _ERROR_CATEGORIES:
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          _error_suppressions.setdefault(category, set()).add(suppressed_line)
        elif category not in _LEGACY_ERROR_CATEGORIES:
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          error(filename, linenum, 'readability/nolint', 5,
                'Unknown NOLINT error category: %s' % category)


def ResetNolintSuppressions():
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  """Resets the set of NOLINT suppressions to empty."""
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  _error_suppressions.clear()


def IsErrorSuppressedByNolint(category, linenum):
  """Returns true if the specified error category is suppressed on this line.

  Consults the global error_suppressions map populated by
  ParseNolintSuppressions/ResetNolintSuppressions.

  Args:
    category: str, the category of the error.
    linenum: int, the current line number.
  Returns:
    bool, True iff the error should be suppressed due to a NOLINT comment.
  """
  return (linenum in _error_suppressions.get(category, set()) or
          linenum in _error_suppressions.get(None, set()))

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def Match(pattern, s):
  """Matches the string with the pattern, caching the compiled regexp."""
  # The regexp compilation caching is inlined in both Match and Search for
  # performance reasons; factoring it out into a separate function turns out
  # to be noticeably expensive.
  if pattern not in _regexp_compile_cache:
    _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
  return _regexp_compile_cache[pattern].match(s)


def ReplaceAll(pattern, rep, s):
  """Replaces instances of pattern in a string with a replacement.

  The compiled regex is kept in a cache shared by Match and Search.

  Args:
    pattern: regex pattern
    rep: replacement text
    s: search string

  Returns:
    string with replacements made (or original string if no replacements)
  """
  if pattern not in _regexp_compile_cache:
    _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
  return _regexp_compile_cache[pattern].sub(rep, s)


def Search(pattern, s):
  """Searches the string for the pattern, caching the compiled regexp."""
  if pattern not in _regexp_compile_cache:
    _regexp_compile_cache[pattern] = sre_compile.compile(pattern)
  return _regexp_compile_cache[pattern].search(s)


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class _IncludeState(object):
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  """Tracks line numbers for includes, and the order in which includes appear.

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  include_list contains list of lists of (header, line number) pairs.
  It's a lists of lists rather than just one flat list to make it
  easier to update across preprocessor boundaries.
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  Call CheckNextIncludeOrder() 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, CheckNextIncludeOrder will raise an error.
  _INITIAL_SECTION = 0
  _MY_H_SECTION = 1
  _C_SECTION = 2
  _CPP_SECTION = 3
  _OTHER_H_SECTION = 4

  _TYPE_NAMES = {
      _C_SYS_HEADER: 'C system header',
      _CPP_SYS_HEADER: 'C++ system header',
      _LIKELY_MY_HEADER: 'header this file implements',
      _POSSIBLE_MY_HEADER: 'header this file may implement',
      _OTHER_HEADER: 'other header',
      }
  _SECTION_NAMES = {
      _INITIAL_SECTION: "... nothing. (This can't be an error.)",
      _MY_H_SECTION: 'a header this file implements',
      _C_SECTION: 'C system header',
      _CPP_SECTION: 'C++ system header',
      _OTHER_H_SECTION: 'other header',
      }

  def __init__(self):
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    self.include_list = [[]]
    self.ResetSection('')

  def FindHeader(self, header):
    """Check if a header has already been included.

    Args:
      header: header to check.
    Returns:
      Line number of previous occurrence, or -1 if the header has not
      been seen before.
    """
    for section_list in self.include_list:
      for f in section_list:
        if f[0] == header:
          return f[1]
    return -1
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  def ResetSection(self, directive):
    """Reset section checking for preprocessor directive.

    Args:
      directive: preprocessor directive (e.g. "if", "else").
    """
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    # The name of the current section.
    self._section = self._INITIAL_SECTION
    # The path of last found header.
    self._last_header = ''

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    # Update list of includes.  Note that we never pop from the
    # include list.
    if directive in ('if', 'ifdef', 'ifndef'):
      self.include_list.append([])
    elif directive in ('else', 'elif'):
      self.include_list[-1] = []

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  def SetLastHeader(self, header_path):
    self._last_header = header_path

  def CanonicalizeAlphabeticalOrder(self, header_path):
    """Returns a path canonicalized for alphabetical comparison.

    - replaces "-" with "_" so they both cmp the same.
    - removes '-inl' since we don't require them to be after the main header.
    - lowercase everything, just in case.

    Args:
      header_path: Path to be canonicalized.

    Returns:
      Canonicalized path.
    """
    return header_path.replace('-inl.h', '.h').replace('-', '_').lower()

  def IsInAlphabeticalOrder(self, clean_lines, linenum, header_path):
    """Check if a header is in alphabetical order with the previous header.

    Args:
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      header_path: Canonicalized header to be checked.

    Returns:
      Returns true if the header is in alphabetical order.
    """
    # If previous section is different from current section, _last_header will
    # be reset to empty string, so it's always less than current header.
    #
    # If previous line was a blank line, assume that the headers are
    # intentionally sorted the way they are.
    if (self._last_header > header_path and
699
        Match(r'^\s*#\s*include\b', clean_lines.elided[linenum - 1])):
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      return False
    return True

  def CheckNextIncludeOrder(self, header_type):
    """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.

    Returns:
      The empty string if the header is in the right order, or an
      error message describing what's wrong.

    """
    error_message = ('Found %s after %s' %
                     (self._TYPE_NAMES[header_type],
                      self._SECTION_NAMES[self._section]))

    last_section = self._section

    if header_type == _C_SYS_HEADER:
      if self._section <= self._C_SECTION:
        self._section = self._C_SECTION
      else:
        self._last_header = ''
        return error_message
    elif header_type == _CPP_SYS_HEADER:
      if self._section <= self._CPP_SECTION:
        self._section = self._CPP_SECTION
      else:
        self._last_header = ''
        return error_message
    elif header_type == _LIKELY_MY_HEADER:
      if self._section <= self._MY_H_SECTION:
        self._section = self._MY_H_SECTION
      else:
        self._section = self._OTHER_H_SECTION
    elif header_type == _POSSIBLE_MY_HEADER:
      if self._section <= self._MY_H_SECTION:
        self._section = self._MY_H_SECTION
      else:
        # This will always be the fallback because we're not sure
        # enough that the header is associated with this file.
        self._section = self._OTHER_H_SECTION
    else:
      assert header_type == _OTHER_HEADER
      self._section = self._OTHER_H_SECTION

    if last_section != self._section:
      self._last_header = ''

    return ''


class _CppLintState(object):
  """Maintains module-wide state.."""

  def __init__(self):
    self.verbose_level = 1  # global setting.
    self.error_count = 0    # global count of reported errors
    # filters to apply when emitting error messages
    self.filters = _DEFAULT_FILTERS[:]
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    # backup of filter list. Used to restore the state after each file.
    self._filters_backup = self.filters[:]
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    self.counting = 'total'  # In what way are we counting errors?
    self.errors_by_category = {}  # string to int dict storing error counts

    # output format:
    # "emacs" - format that emacs can parse (default)
    # "vs7" - format that Microsoft Visual Studio 7 can parse
    self.output_format = 'emacs'

  def SetOutputFormat(self, output_format):
    """Sets the output format for errors."""
    self.output_format = output_format

  def SetVerboseLevel(self, level):
    """Sets the module's verbosity, and returns the previous setting."""
    last_verbose_level = self.verbose_level
    self.verbose_level = level
    return last_verbose_level

  def SetCountingStyle(self, counting_style):
    """Sets the module's counting options."""
    self.counting = counting_style

  def SetFilters(self, filters):
    """Sets the error-message filters.

    These filters are applied when deciding whether to emit a given
    error message.

    Args:
      filters: A string of comma-separated filters (eg "+whitespace/indent").
               Each filter should start with + or -; else we die.

    Raises:
      ValueError: The comma-separated filters did not all start with '+' or '-'.
                  E.g. "-,+whitespace,-whitespace/indent,whitespace/badfilter"
    """
    # Default filters always have less priority than the flag ones.
    self.filters = _DEFAULT_FILTERS[:]
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    self.AddFilters(filters)

  def AddFilters(self, filters):
    """ Adds more filters to the existing list of error-message filters. """
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    for filt in filters.split(','):
      clean_filt = filt.strip()
      if clean_filt:
        self.filters.append(clean_filt)
    for filt in self.filters:
      if not (filt.startswith('+') or filt.startswith('-')):
        raise ValueError('Every filter in --filters must start with + or -'
                         ' (%s does not)' % filt)

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  def BackupFilters(self):
    """ Saves the current filter list to backup storage."""
    self._filters_backup = self.filters[:]

  def RestoreFilters(self):
    """ Restores filters previously backed up."""
    self.filters = self._filters_backup[:]

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  def ResetErrorCounts(self):
    """Sets the module's error statistic back to zero."""
    self.error_count = 0
    self.errors_by_category = {}

  def IncrementErrorCount(self, category):
    """Bumps the module's error statistic."""
    self.error_count += 1
    if self.counting in ('toplevel', 'detailed'):
      if self.counting != 'detailed':
        category = category.split('/')[0]
      if category not in self.errors_by_category:
        self.errors_by_category[category] = 0
      self.errors_by_category[category] += 1

  def PrintErrorCounts(self):
    """Print a summary of errors by category, and the total."""
    for category, count in self.errors_by_category.iteritems():
      sys.stderr.write('Category \'%s\' errors found: %d\n' %
                       (category, count))
    sys.stderr.write('Total errors found: %d\n' % self.error_count)

_cpplint_state = _CppLintState()


def _OutputFormat():
  """Gets the module's output format."""
  return _cpplint_state.output_format


def _SetOutputFormat(output_format):
  """Sets the module's output format."""
  _cpplint_state.SetOutputFormat(output_format)


def _VerboseLevel():
  """Returns the module's verbosity setting."""
  return _cpplint_state.verbose_level


def _SetVerboseLevel(level):
  """Sets the module's verbosity, and returns the previous setting."""
  return _cpplint_state.SetVerboseLevel(level)


def _SetCountingStyle(level):
  """Sets the module's counting options."""
  _cpplint_state.SetCountingStyle(level)


def _Filters():
  """Returns the module's list of output filters, as a list."""
  return _cpplint_state.filters


def _SetFilters(filters):
  """Sets the module's error-message filters.

  These filters are applied when deciding whether to emit a given
  error message.

  Args:
    filters: A string of comma-separated filters (eg "whitespace/indent").
             Each filter should start with + or -; else we die.
  """
  _cpplint_state.SetFilters(filters)

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def _AddFilters(filters):
  """Adds more filter overrides.

  Unlike _SetFilters, this function does not reset the current list of filters
  available.

  Args:
    filters: A string of comma-separated filters (eg "whitespace/indent").
             Each filter should start with + or -; else we die.
  """
  _cpplint_state.AddFilters(filters)

def _BackupFilters():
  """ Saves the current filter list to backup storage."""
  _cpplint_state.BackupFilters()

def _RestoreFilters():
  """ Restores filters previously backed up."""
  _cpplint_state.RestoreFilters()
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class _FunctionState(object):
  """Tracks current function name and the number of lines in its body."""

  _NORMAL_TRIGGER = 250  # for --v=0, 500 for --v=1, etc.
  _TEST_TRIGGER = 400    # about 50% more than _NORMAL_TRIGGER.

  def __init__(self):
    self.in_a_function = False
    self.lines_in_function = 0
    self.current_function = ''

  def Begin(self, function_name):
    """Start analyzing function body.

    Args:
      function_name: The name of the function being tracked.
    """
    self.in_a_function = True
    self.lines_in_function = 0
    self.current_function = function_name

  def Count(self):
    """Count line in current function body."""
    if self.in_a_function:
      self.lines_in_function += 1

  def Check(self, error, filename, linenum):
    """Report if too many lines in function body.

    Args:
      error: The function to call with any errors found.
      filename: The name of the current file.
      linenum: The number of the line to check.
    """
    if Match(r'T(EST|est)', self.current_function):
      base_trigger = self._TEST_TRIGGER
    else:
      base_trigger = self._NORMAL_TRIGGER
    trigger = base_trigger * 2**_VerboseLevel()

    if self.lines_in_function > trigger:
      error_level = int(math.log(self.lines_in_function / base_trigger, 2))
      # 50 => 0, 100 => 1, 200 => 2, 400 => 3, 800 => 4, 1600 => 5, ...
      if error_level > 5:
        error_level = 5
      error(filename, linenum, 'readability/fn_size', error_level,
            'Small and focused functions are preferred:'
            ' %s has %d non-comment lines'
            ' (error triggered by exceeding %d lines).'  % (
                self.current_function, self.lines_in_function, trigger))

  def End(self):
    """Stop analyzing function body."""
    self.in_a_function = False


class _IncludeError(Exception):
  """Indicates a problem with the include order in a file."""
  pass


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class FileInfo(object):
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  """Provides utility functions for filenames.

  FileInfo provides easy access to the components of a file's path
  relative to the project root.
  """

  def __init__(self, filename):
    self._filename = filename

  def FullName(self):
    """Make Windows paths like Unix."""
    return os.path.abspath(self._filename).replace('\\', '/')

  def RepositoryName(self):
    """FullName after removing the local path to the repository.

    If we have a real absolute path name here we can try to do something smart:
    detecting the root of the checkout and truncating /path/to/checkout from
    the name so that we get header guards that don't include things like
    "C:\Documents and Settings\..." or "/home/username/..." in them and thus
    people on different computers who have checked the source out to different
    locations won't see bogus errors.
    """
    fullname = self.FullName()

    if os.path.exists(fullname):
      project_dir = os.path.dirname(fullname)

      if os.path.exists(os.path.join(project_dir, ".svn")):
        # If there's a .svn file in the current directory, we recursively look
        # up the directory tree for the top of the SVN checkout
        root_dir = project_dir
        one_up_dir = os.path.dirname(root_dir)
        while os.path.exists(os.path.join(one_up_dir, ".svn")):
          root_dir = os.path.dirname(root_dir)
          one_up_dir = os.path.dirname(one_up_dir)

        prefix = os.path.commonprefix([root_dir, project_dir])
        return fullname[len(prefix) + 1:]

      # Not SVN <= 1.6? Try to find a git, hg, or svn top level directory by
      # searching up from the current path.
      root_dir = os.path.dirname(fullname)
      while (root_dir != os.path.dirname(root_dir) and
             not os.path.exists(os.path.join(root_dir, ".git")) and
             not os.path.exists(os.path.join(root_dir, ".hg")) and
             not os.path.exists(os.path.join(root_dir, ".svn"))):
        root_dir = os.path.dirname(root_dir)

      if (os.path.exists(os.path.join(root_dir, ".git")) or
          os.path.exists(os.path.join(root_dir, ".hg")) or
          os.path.exists(os.path.join(root_dir, ".svn"))):
        prefix = os.path.commonprefix([root_dir, project_dir])
        return fullname[len(prefix) + 1:]

    # Don't know what to do; header guard warnings may be wrong...
    return fullname

  def Split(self):
    """Splits the file into the directory, basename, and extension.

    For 'chrome/browser/browser.cc', Split() would
    return ('chrome/browser', 'browser', '.cc')

    Returns:
      A tuple of (directory, basename, extension).
    """

    googlename = self.RepositoryName()
    project, rest = os.path.split(googlename)
    return (project,) + os.path.splitext(rest)

  def BaseName(self):
    """File base name - text after the final slash, before the final period."""
    return self.Split()[1]

  def Extension(self):
    """File extension - text following the final period."""
    return self.Split()[2]

  def NoExtension(self):
    """File has no source file extension."""
    return '/'.join(self.Split()[0:2])

  def IsSource(self):
    """File has a source file extension."""
    return self.Extension()[1:] in ('c', 'cc', 'cpp', 'cxx')


def _ShouldPrintError(category, confidence, linenum):
  """If confidence >= verbose, category passes filter and is not suppressed."""

  # There are three ways we might decide not to print an error message:
  # a "NOLINT(category)" comment appears in the source,
  # the verbosity level isn't high enough, or the filters filter it out.
  if IsErrorSuppressedByNolint(category, linenum):
    return False
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  if confidence < _cpplint_state.verbose_level:
    return False

  is_filtered = False
  for one_filter in _Filters():
    if one_filter.startswith('-'):
      if category.startswith(one_filter[1:]):
        is_filtered = True
    elif one_filter.startswith('+'):
      if category.startswith(one_filter[1:]):
        is_filtered = False
    else:
      assert False  # should have been checked for in SetFilter.
  if is_filtered:
    return False

  return True


def Error(filename, linenum, category, confidence, message):
  """Logs the fact we've found a lint error.

  We log where the error was found, and also our confidence in the error,
  that is, how certain we are this is a legitimate style regression, and
  not a misidentification or a use that's sometimes justified.

  False positives can be suppressed by the use of
  "cpplint(category)"  comments on the offending line.  These are
  parsed into _error_suppressions.

  Args:
    filename: The name of the file containing the error.
    linenum: The number of the line containing the error.
    category: A string used to describe the "category" this bug
      falls under: "whitespace", say, or "runtime".  Categories
      may have a hierarchy separated by slashes: "whitespace/indent".
    confidence: A number from 1-5 representing a confidence score for
      the error, with 5 meaning that we are certain of the problem,
      and 1 meaning that it could be a legitimate construct.
    message: The error message.
  """
  if _ShouldPrintError(category, confidence, linenum):
    _cpplint_state.IncrementErrorCount(category)
    if _cpplint_state.output_format == 'vs7':
      sys.stderr.write('%s(%s):  %s  [%s] [%d]\n' % (
          filename, linenum, message, category, confidence))
    elif _cpplint_state.output_format == 'eclipse':
      sys.stderr.write('%s:%s: warning: %s  [%s] [%d]\n' % (
          filename, linenum, message, category, confidence))
    else:
      sys.stderr.write('%s:%s:  %s  [%s] [%d]\n' % (
          filename, linenum, message, category, confidence))


# Matches standard C++ escape sequences per 2.13.2.3 of the C++ standard.
_RE_PATTERN_CLEANSE_LINE_ESCAPES = re.compile(
    r'\\([abfnrtv?"\\\']|\d+|x[0-9a-fA-F]+)')
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# Match a single C style comment on the same line.
_RE_PATTERN_C_COMMENTS = r'/\*(?:[^*]|\*(?!/))*\*/'
# Matches multi-line C style comments.
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# 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(
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    r'(\s*' + _RE_PATTERN_C_COMMENTS + r'\s*$|' +
    _RE_PATTERN_C_COMMENTS + r'\s+|' +
    r'\s+' + _RE_PATTERN_C_COMMENTS + r'(?=\W)|' +
    _RE_PATTERN_C_COMMENTS + r')')
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def IsCppString(line):
  """Does line terminate so, that the next symbol is in string constant.

  This function does not consider single-line nor multi-line comments.

  Args:
    line: is a partial line of code starting from the 0..n.

  Returns:
    True, if next character appended to 'line' is inside a
    string constant.
  """

  line = line.replace(r'\\', 'XX')  # after this, \\" does not match to \"
  return ((line.count('"') - line.count(r'\"') - line.count("'\"'")) & 1) == 1


def CleanseRawStrings(raw_lines):
  """Removes C++11 raw strings from lines.

    Before:
      static const char kData[] = R"(
          multi-line string
          )";

    After:
      static const char kData[] = ""
          (replaced by blank line)
          "";

  Args:
    raw_lines: list of raw lines.

  Returns:
    list of lines with C++11 raw strings replaced by empty strings.
  """

  delimiter = None
  lines_without_raw_strings = []
  for line in raw_lines:
    if delimiter:
      # Inside a raw string, look for the end
      end = line.find(delimiter)
      if end >= 0:
        # Found the end of the string, match leading space for this
        # line and resume copying the original lines, and also insert
        # a "" on the last line.
        leading_space = Match(r'^(\s*)\S', line)
        line = leading_space.group(1) + '""' + line[end + len(delimiter):]
        delimiter = None
      else:
        # Haven't found the end yet, append a blank line.
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        line = '""'
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    # Look for beginning of a raw string, and replace them with
    # empty strings.  This is done in a loop to handle multiple raw
    # strings on the same line.
    while delimiter is None:
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      # Look for beginning of a raw string.
      # See 2.14.15 [lex.string] for syntax.
      matched = Match(r'^(.*)\b(?:R|u8R|uR|UR|LR)"([^\s\\()]*)\((.*)$', line)
      if matched:
        delimiter = ')' + matched.group(2) + '"'

        end = matched.group(3).find(delimiter)
        if end >= 0:
          # Raw string ended on same line
          line = (matched.group(1) + '""' +
                  matched.group(3)[end + len(delimiter):])
          delimiter = None
        else:
          # Start of a multi-line raw string
          line = matched.group(1) + '""'
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      else:
        break
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    lines_without_raw_strings.append(line)

  # TODO(unknown): if delimiter is not None here, we might want to
  # emit a warning for unterminated string.
  return lines_without_raw_strings


def FindNextMultiLineCommentStart(lines, lineix):
  """Find the beginning marker for a multiline comment."""
  while lineix < len(lines):
    if lines[lineix].strip().startswith('/*'):
      # Only return this marker if the comment goes beyond this line
      if lines[lineix].strip().find('*/', 2) < 0:
        return lineix
    lineix += 1
  return len(lines)


def FindNextMultiLineCommentEnd(lines, lineix):
  """We are inside a comment, find the end marker."""
  while lineix < len(lines):
    if lines[lineix].strip().endswith('*/'):
      return lineix
    lineix += 1
  return len(lines)


def RemoveMultiLineCommentsFromRange(lines, begin, end):
  """Clears a range of lines for multi-line comments."""
  # Having // dummy comments makes the lines non-empty, so we will not get
  # unnecessary blank line warnings later in the code.
  for i in range(begin, end):
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    lines[i] = '/**/'
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def RemoveMultiLineComments(filename, lines, error):
  """Removes multiline (c-style) comments from lines."""
  lineix = 0
  while lineix < len(lines):
    lineix_begin = FindNextMultiLineCommentStart(lines, lineix)
    if lineix_begin >= len(lines):
      return
    lineix_end = FindNextMultiLineCommentEnd(lines, lineix_begin)
    if lineix_end >= len(lines):
      error(filename, lineix_begin + 1, 'readability/multiline_comment', 5,
            'Could not find end of multi-line comment')
      return
    RemoveMultiLineCommentsFromRange(lines, lineix_begin, lineix_end + 1)
    lineix = lineix_end + 1


def CleanseComments(line):
  """Removes //-comments and single-line C-style /* */ comments.

  Args:
    line: A line of C++ source.

  Returns:
    The line with single-line comments removed.
  """
  commentpos = line.find('//')
  if commentpos != -1 and not IsCppString(line[:commentpos]):
    line = line[:commentpos].rstrip()
  # get rid of /* ... */
  return _RE_PATTERN_CLEANSE_LINE_C_COMMENTS.sub('', line)


class CleansedLines(object):
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  """Holds 4 copies of all lines with different preprocessing applied to them.
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  1) elided member contains lines without strings and comments.
  2) lines member contains lines without comments.
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  3) raw_lines member contains all the lines without processing.
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  4) lines_without_raw_strings member is same as raw_lines, but with C++11 raw
     strings removed.
  All these members are of <type 'list'>, and of the same length.
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  """

  def __init__(self, lines):
    self.elided = []
    self.lines = []
    self.raw_lines = lines
    self.num_lines = len(lines)
    self.lines_without_raw_strings = CleanseRawStrings(lines)
    for linenum in range(len(self.lines_without_raw_strings)):
      self.lines.append(CleanseComments(
          self.lines_without_raw_strings[linenum]))
      elided = self._CollapseStrings(self.lines_without_raw_strings[linenum])
      self.elided.append(CleanseComments(elided))

  def NumLines(self):
    """Returns the number of lines represented."""
    return self.num_lines

  @staticmethod
  def _CollapseStrings(elided):
    """Collapses strings and chars on a line to simple "" or '' blocks.

    We nix strings first so we're not fooled by text like '"http://"'

    Args:
      elided: The line being processed.

    Returns:
      The line with collapsed strings.
    """
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
    if _RE_PATTERN_INCLUDE.match(elided):
      return 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)

    # Replace quoted strings and digit separators.  Both single quotes
    # and double quotes are processed in the same loop, otherwise
    # nested quotes wouldn't work.
    collapsed = ''
    while True:
      # Find the first quote character
      match = Match(r'^([^\'"]*)([\'"])(.*)$', elided)
      if not match:
        collapsed += elided
        break
      head, quote, tail = match.groups()

      if quote == '"':
        # Collapse double quoted strings
        second_quote = tail.find('"')
        if second_quote >= 0:
          collapsed += head + '""'
          elided = tail[second_quote + 1:]
        else:
          # Unmatched double quote, don't bother processing the rest
          # of the line since this is probably a multiline string.
          collapsed += elided
          break
      else:
        # Found single quote, check nearby text to eliminate digit separators.
        #
        # There is no special handling for floating point here, because
        # the integer/fractional/exponent parts would all be parsed
        # correctly as long as there are digits on both sides of the
        # separator.  So we are fine as long as we don't see something
        # like "0.'3" (gcc 4.9.0 will not allow this literal).
        if Search(r'\b(?:0[bBxX]?|[1-9])[0-9a-fA-F]*$', head):
          match_literal = Match(r'^((?:\'?[0-9a-zA-Z_])*)(.*)$', "'" + tail)
          collapsed += head + match_literal.group(1).replace("'", '')
          elided = match_literal.group(2)
        else:
          second_quote = tail.find('\'')
          if second_quote >= 0:
            collapsed += head + "''"
            elided = tail[second_quote + 1:]
          else:
            # Unmatched single quote
            collapsed += elided
            break

    return collapsed
1383 1384


1385 1386
def FindEndOfExpressionInLine(line, startpos, stack):
  """Find the position just after the end of current parenthesized expression.
1387 1388 1389 1390

  Args:
    line: a CleansedLines line.
    startpos: start searching at this position.
1391
    stack: nesting stack at startpos.
1392 1393

  Returns:
1394 1395 1396
    On finding matching end: (index just after matching end, None)
    On finding an unclosed expression: (-1, None)
    Otherwise: (-1, new stack at end of this line)
1397 1398
  """
  for i in xrange(startpos, len(line)):
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    char = line[i]
    if char in '([{':
      # Found start of parenthesized expression, push to expression stack
      stack.append(char)
    elif char == '<':
      # Found potential start of template argument list
      if i > 0 and line[i - 1] == '<':
        # Left shift operator
        if stack and stack[-1] == '<':
          stack.pop()
          if not stack:
            return (-1, None)
      elif i > 0 and Search(r'\boperator\s*$', line[0:i]):
        # operator<, don't add to stack
        continue
      else:
        # Tentative start of template argument list
        stack.append('<')
    elif char in ')]}':
      # Found end of parenthesized expression.
      #
      # If we are currently expecting a matching '>', the pending '<'
      # must have been an operator.  Remove them from expression stack.
      while stack and stack[-1] == '<':
        stack.pop()
      if not stack:
        return (-1, None)
      if ((stack[-1] == '(' and char == ')') or
          (stack[-1] == '[' and char == ']') or
          (stack[-1] == '{' and char == '}')):
        stack.pop()
        if not stack:
          return (i + 1, None)
      else:
        # Mismatched parentheses
        return (-1, None)
    elif char == '>':
      # Found potential end of template argument list.

      # Ignore "->" and operator functions
      if (i > 0 and
          (line[i - 1] == '-' or Search(r'\boperator\s*$', line[0:i - 1]))):
        continue

      # Pop the stack if there is a matching '<'.  Otherwise, ignore
      # this '>' since it must be an operator.
      if stack:
        if stack[-1] == '<':
          stack.pop()
          if not stack:
            return (i + 1, None)
    elif char == ';':
      # Found something that look like end of statements.  If we are currently
      # expecting a '>', the matching '<' must have been an operator, since
      # template argument list should not contain statements.
      while stack and stack[-1] == '<':
        stack.pop()
      if not stack:
        return (-1, None)

  # Did not find end of expression or unbalanced parentheses on this line
  return (-1, stack)
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def CloseExpression(clean_lines, linenum, pos):
  """If input points to ( or { or [ or <, finds the position that closes it.

  If lines[linenum][pos] points to a '(' or '{' or '[' or '<', finds the
  linenum/pos that correspond to the closing of the expression.

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  TODO(unknown): cpplint spends a fair bit of time matching parentheses.
  Ideally we would want to index all opening and closing parentheses once
  and have CloseExpression be just a simple lookup, but due to preprocessor
  tricks, this is not so easy.

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  Args:
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    pos: A position on the line.

  Returns:
    A tuple (line, linenum, pos) pointer *past* the closing brace, or
    (line, len(lines), -1) if we never find a close.  Note we ignore
    strings and comments when matching; and the line we return is the
    'cleansed' line at linenum.
  """

  line = clean_lines.elided[linenum]
1487
  if (line[pos] not in '({[<') or Match(r'<[<=]', line[pos:]):
1488 1489 1490
    return (line, clean_lines.NumLines(), -1)

  # Check first line
1491
  (end_pos, stack) = FindEndOfExpressionInLine(line, pos, [])
1492 1493 1494 1495
  if end_pos > -1:
    return (line, linenum, end_pos)

  # Continue scanning forward
1496
  while stack and linenum < clean_lines.NumLines() - 1:
1497 1498
    linenum += 1
    line = clean_lines.elided[linenum]
1499
    (end_pos, stack) = FindEndOfExpressionInLine(line, 0, stack)
1500 1501 1502
    if end_pos > -1:
      return (line, linenum, end_pos)

1503
  # Did not find end of expression before end of file, give up
1504 1505 1506
  return (line, clean_lines.NumLines(), -1)


1507 1508
def FindStartOfExpressionInLine(line, endpos, stack):
  """Find position at the matching start of current expression.
1509 1510 1511 1512 1513 1514 1515

  This is almost the reverse of FindEndOfExpressionInLine, but note
  that the input position and returned position differs by 1.

  Args:
    line: a CleansedLines line.
    endpos: start searching at this position.
1516
    stack: nesting stack at endpos.
1517 1518

  Returns:
1519 1520 1521
    On finding matching start: (index at matching start, None)
    On finding an unclosed expression: (-1, None)
    Otherwise: (-1, new stack at beginning of this line)
1522
  """
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  i = endpos
  while i >= 0:
    char = line[i]
    if char in ')]}':
      # Found end of expression, push to expression stack
      stack.append(char)
    elif char == '>':
      # Found potential end of template argument list.
      #
      # Ignore it if it's a "->" or ">=" or "operator>"
      if (i > 0 and
          (line[i - 1] == '-' or
           Match(r'\s>=\s', line[i - 1:]) or
           Search(r'\boperator\s*$', line[0:i]))):
        i -= 1
      else:
        stack.append('>')
    elif char == '<':
      # Found potential start of template argument list
      if i > 0 and line[i - 1] == '<':
        # Left shift operator
        i -= 1
      else:
        # If there is a matching '>', we can pop the expression stack.
        # Otherwise, ignore this '<' since it must be an operator.
        if stack and stack[-1] == '>':
          stack.pop()
          if not stack:
            return (i, None)
    elif char in '([{':
      # Found start of expression.
      #
      # If there are any unmatched '>' on the stack, they must be
      # operators.  Remove those.
      while stack and stack[-1] == '>':
        stack.pop()
      if not stack:
        return (-1, None)
      if ((char == '(' and stack[-1] == ')') or
          (char == '[' and stack[-1] == ']') or
          (char == '{' and stack[-1] == '}')):
        stack.pop()
        if not stack:
          return (i, None)
      else:
        # Mismatched parentheses
        return (-1, None)
    elif char == ';':
      # Found something that look like end of statements.  If we are currently
      # expecting a '<', the matching '>' must have been an operator, since
      # template argument list should not contain statements.
      while stack and stack[-1] == '>':
        stack.pop()
      if not stack:
        return (-1, None)

    i -= 1

  return (-1, stack)
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def ReverseCloseExpression(clean_lines, linenum, pos):
  """If input points to ) or } or ] or >, finds the position that opens it.

  If lines[linenum][pos] points to a ')' or '}' or ']' or '>', finds the
  linenum/pos that correspond to the opening of the expression.

  Args:
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    pos: A position on the line.

  Returns:
    A tuple (line, linenum, pos) pointer *at* the opening brace, or
    (line, 0, -1) if we never find the matching opening brace.  Note
    we ignore strings and comments when matching; and the line we
    return is the 'cleansed' line at linenum.
  """
  line = clean_lines.elided[linenum]
1602
  if line[pos] not in ')}]>':
1603 1604 1605
    return (line, 0, -1)

  # Check last line
1606
  (start_pos, stack) = FindStartOfExpressionInLine(line, pos, [])
1607 1608 1609 1610
  if start_pos > -1:
    return (line, linenum, start_pos)

  # Continue scanning backward
1611
  while stack and linenum > 0:
1612 1613
    linenum -= 1
    line = clean_lines.elided[linenum]
1614
    (start_pos, stack) = FindStartOfExpressionInLine(line, len(line) - 1, stack)
1615 1616 1617
    if start_pos > -1:
      return (line, linenum, start_pos)

1618
  # Did not find start of expression before beginning of file, give up
1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
  return (line, 0, -1)


def CheckForCopyright(filename, lines, error):
  """Logs an error if no Copyright message appears at the top of the file."""

  # We'll say it should occur by line 10. Don't forget there's a
  # dummy line at the front.
  for line in xrange(1, min(len(lines), 11)):
    if re.search(r'Copyright', lines[line], re.I): break
  else:                       # means no copyright line was found
    error(filename, 0, 'legal/copyright', 5,
          'No copyright message found.  '
          'You should have a line: "Copyright [year] <Copyright Owner>"')


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def GetIndentLevel(line):
  """Return the number of leading spaces in line.

  Args:
    line: A string to check.

  Returns:
    An integer count of leading spaces, possibly zero.
  """
  indent = Match(r'^( *)\S', line)
  if indent:
    return len(indent.group(1))
  else:
    return 0


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def GetHeaderGuardCPPVariable(filename):
  """Returns the CPP variable that should be used as a header guard.

  Args:
    filename: The name of a C++ header file.

  Returns:
    The CPP variable that should be used as a header guard in the
    named file.

  """

  # Restores original filename in case that cpplint is invoked from Emacs's
  # flymake.
  filename = re.sub(r'_flymake\.h$', '.h', filename)
  filename = re.sub(r'/\.flymake/([^/]*)$', r'/\1', filename)
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  # Replace 'c++' with 'cpp'.
  filename = filename.replace('C++', 'cpp').replace('c++', 'cpp')
  
1670 1671 1672 1673
  fileinfo = FileInfo(filename)
  file_path_from_root = fileinfo.RepositoryName()
  if _root:
    file_path_from_root = re.sub('^' + _root + os.sep, '', file_path_from_root)
1674
  return re.sub(r'[^a-zA-Z0-9]', '_', file_path_from_root).upper() + '_'
1675 1676


1677
def CheckForHeaderGuard(filename, clean_lines, error):
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  """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.
1685
    clean_lines: A CleansedLines instance containing the file.
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    error: The function to call with any errors found.
  """

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  # Don't check for header guards if there are error suppression
  # comments somewhere in this file.
  #
  # Because this is silencing a warning for a nonexistent line, we
  # only support the very specific NOLINT(build/header_guard) syntax,
  # and not the general NOLINT or NOLINT(*) syntax.
  raw_lines = clean_lines.lines_without_raw_strings
  for i in raw_lines:
    if Search(r'//\s*NOLINT\(build/header_guard\)', i):
      return

1700 1701
  cppvar = GetHeaderGuardCPPVariable(filename)

1702
  ifndef = ''
1703
  ifndef_linenum = 0
1704 1705
  define = ''
  endif = ''
1706
  endif_linenum = 0
1707
  for linenum, line in enumerate(raw_lines):
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    linesplit = line.split()
    if len(linesplit) >= 2:
      # find the first occurrence of #ifndef and #define, save arg
      if not ifndef and linesplit[0] == '#ifndef':
        # set ifndef to the header guard presented on the #ifndef line.
        ifndef = linesplit[1]
        ifndef_linenum = linenum
      if not define and linesplit[0] == '#define':
        define = linesplit[1]
    # find the last occurrence of #endif, save entire line
    if line.startswith('#endif'):
      endif = line
      endif_linenum = linenum

1722
  if not ifndef or not define or ifndef != define:
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
    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

1735
    ParseNolintSuppressions(filename, raw_lines[ifndef_linenum], ifndef_linenum,
1736 1737 1738 1739
                            error)
    error(filename, ifndef_linenum, 'build/header_guard', error_level,
          '#ifndef header guard has wrong style, please use: %s' % cppvar)

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  # Check for "//" comments on endif line.
  ParseNolintSuppressions(filename, raw_lines[endif_linenum], endif_linenum,
                          error)
  match = Match(r'#endif\s*//\s*' + cppvar + r'(_)?\b', endif)
  if match:
    if match.group(1) == '_':
      # Issue low severity warning for deprecated double trailing underscore
      error(filename, endif_linenum, 'build/header_guard', 0,
            '#endif line should be "#endif  // %s"' % cppvar)
1749 1750
    return

1751 1752 1753 1754 1755 1756 1757 1758 1759
  # Didn't find the corresponding "//" comment.  If this file does not
  # contain any "//" comments at all, it could be that the compiler
  # only wants "/**/" comments, look for those instead.
  no_single_line_comments = True
  for i in xrange(1, len(raw_lines) - 1):
    line = raw_lines[i]
    if Match(r'^(?:(?:\'(?:\.|[^\'])*\')|(?:"(?:\.|[^"])*")|[^\'"])*//', line):
      no_single_line_comments = False
      break
1760

1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
  if no_single_line_comments:
    match = Match(r'#endif\s*/\*\s*' + cppvar + r'(_)?\s*\*/', endif)
    if match:
      if match.group(1) == '_':
        # Low severity warning for double trailing underscore
        error(filename, endif_linenum, 'build/header_guard', 0,
              '#endif line should be "#endif  /* %s */"' % cppvar)
      return

  # Didn't find anything
  error(filename, endif_linenum, 'build/header_guard', 5,
        '#endif line should be "#endif  // %s"' % cppvar)


def CheckHeaderFileIncluded(filename, include_state, error):
  """Logs an error if a .cc file does not include its header."""

  # Do not check test files
  if filename.endswith('_test.cc') or filename.endswith('_unittest.cc'):
    return

  fileinfo = FileInfo(filename)
  headerfile = filename[0:len(filename) - 2] + 'h'
  if not os.path.exists(headerfile):
    return
  headername = FileInfo(headerfile).RepositoryName()
  first_include = 0
  for section_list in include_state.include_list:
    for f in section_list:
      if headername in f[0] or f[0] in headername:
        return
      if not first_include:
        first_include = f[1]

  error(filename, first_include, 'build/include', 5,
        '%s should include its header file %s' % (fileinfo.RepositoryName(),
                                                  headername))
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def CheckForBadCharacters(filename, lines, error):
  """Logs an error for each line containing bad characters.

  Two kinds of bad characters:

  1. 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.

  2. NUL bytes.  These are problematic for some tools.

  Args:
    filename: The name of the current file.
    lines: An array of strings, each representing a line of the file.
    error: The function to call with any errors found.
  """
  for linenum, line in enumerate(lines):
    if u'\ufffd' in line:
      error(filename, linenum, 'readability/utf8', 5,
            'Line contains invalid UTF-8 (or Unicode replacement character).')
    if '\0' in line:
      error(filename, linenum, 'readability/nul', 5, 'Line contains NUL byte.')


def CheckForNewlineAtEOF(filename, lines, error):
  """Logs an error if there is no newline char at the end of the file.

  Args:
    filename: The name of the current file.
    lines: An array of strings, each representing a line of the file.
    error: The function to call with any errors found.
  """

  # The array lines() was created by adding two newlines to the
  # original file (go figure), then splitting on \n.
  # To verify that the file ends in \n, we just have to make sure the
  # last-but-two element of lines() exists and is empty.
  if len(lines) < 3 or lines[-2]:
    error(filename, len(lines) - 2, 'whitespace/ending_newline', 5,
          'Could not find a newline character at the end of the file.')


def CheckForMultilineCommentsAndStrings(filename, clean_lines, linenum, error):
  """Logs an error if we see /* ... */ or "..." that extend past one line.

  /* ... */ comments are legit inside macros, for one line.
  Otherwise, we prefer // comments, so it's ok to warn about the
  other.  Likewise, it's ok for strings to extend across multiple
  lines, as long as a line continuation character (backslash)
  terminates each line. Although not currently prohibited by the C++
  style guide, it's ugly and unnecessary. We don't do well with either
  in this lint program, so we warn about both.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    error: The function to call with any errors found.
  """
  line = clean_lines.elided[linenum]

  # Remove all \\ (escaped backslashes) from the line. They are OK, and the
  # second (escaped) slash may trigger later \" detection erroneously.
  line = line.replace('\\\\', '')

  if line.count('/*') > line.count('*/'):
    error(filename, linenum, 'readability/multiline_comment', 5,
          'Complex multi-line /*...*/-style comment found. '
          'Lint may give bogus warnings.  '
          'Consider replacing these with //-style comments, '
          'with #if 0...#endif, '
          'or with more clearly structured multi-line comments.')

  if (line.count('"') - line.count('\\"')) % 2:
    error(filename, linenum, 'readability/multiline_string', 5,
          'Multi-line string ("...") found.  This lint script doesn\'t '
          'do well with such strings, and may give bogus warnings.  '
          'Use C++11 raw strings or concatenation instead.')


1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
# (non-threadsafe name, thread-safe alternative, validation pattern)
#
# The validation pattern is used to eliminate false positives such as:
#  _rand();               // false positive due to substring match.
#  ->rand();              // some member function rand().
#  ACMRandom rand(seed);  // some variable named rand.
#  ISAACRandom rand();    // another variable named rand.
#
# Basically we require the return value of these functions to be used
# in some expression context on the same line by matching on some
# operator before the function name.  This eliminates constructors and
# member function calls.
_UNSAFE_FUNC_PREFIX = r'(?:[-+*/=%^&|(<]\s*|>\s+)'
_THREADING_LIST = (
    ('asctime(', 'asctime_r(', _UNSAFE_FUNC_PREFIX + r'asctime\([^)]+\)'),
    ('ctime(', 'ctime_r(', _UNSAFE_FUNC_PREFIX + r'ctime\([^)]+\)'),
    ('getgrgid(', 'getgrgid_r(', _UNSAFE_FUNC_PREFIX + r'getgrgid\([^)]+\)'),
    ('getgrnam(', 'getgrnam_r(', _UNSAFE_FUNC_PREFIX + r'getgrnam\([^)]+\)'),
    ('getlogin(', 'getlogin_r(', _UNSAFE_FUNC_PREFIX + r'getlogin\(\)'),
    ('getpwnam(', 'getpwnam_r(', _UNSAFE_FUNC_PREFIX + r'getpwnam\([^)]+\)'),
    ('getpwuid(', 'getpwuid_r(', _UNSAFE_FUNC_PREFIX + r'getpwuid\([^)]+\)'),
    ('gmtime(', 'gmtime_r(', _UNSAFE_FUNC_PREFIX + r'gmtime\([^)]+\)'),
    ('localtime(', 'localtime_r(', _UNSAFE_FUNC_PREFIX + r'localtime\([^)]+\)'),
    ('rand(', 'rand_r(', _UNSAFE_FUNC_PREFIX + r'rand\(\)'),
    ('strtok(', 'strtok_r(',
     _UNSAFE_FUNC_PREFIX + r'strtok\([^)]+\)'),
    ('ttyname(', 'ttyname_r(', _UNSAFE_FUNC_PREFIX + r'ttyname\([^)]+\)'),
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
    )


def CheckPosixThreading(filename, clean_lines, linenum, error):
  """Checks for calls to thread-unsafe functions.

  Much code has been originally written without consideration of
  multi-threading. Also, engineers are relying on their old experience;
  they have learned posix before threading extensions were added. These
  tests guide the engineers to use thread-safe functions (when using
  posix directly).

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    error: The function to call with any errors found.
  """
  line = clean_lines.elided[linenum]
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  for single_thread_func, multithread_safe_func, pattern in _THREADING_LIST:
    # Additional pattern matching check to confirm that this is the
    # function we are looking for
    if Search(pattern, line):
1931
      error(filename, linenum, 'runtime/threadsafe_fn', 2,
1932 1933
            'Consider using ' + multithread_safe_func +
            '...) instead of ' + single_thread_func +
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            '...) for improved thread safety.')


def CheckVlogArguments(filename, clean_lines, linenum, error):
  """Checks that VLOG() is only used for defining a logging level.

  For example, VLOG(2) is correct. VLOG(INFO), VLOG(WARNING), VLOG(ERROR), and
  VLOG(FATAL) are not.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    error: The function to call with any errors found.
  """
  line = clean_lines.elided[linenum]
  if Search(r'\bVLOG\((INFO|ERROR|WARNING|DFATAL|FATAL)\)', line):
    error(filename, linenum, 'runtime/vlog', 5,
          'VLOG() should be used with numeric verbosity level.  '
          'Use LOG() if you want symbolic severity levels.')

# Matches invalid increment: *count++, which moves pointer instead of
# incrementing a value.
_RE_PATTERN_INVALID_INCREMENT = re.compile(
    r'^\s*\*\w+(\+\+|--);')


def CheckInvalidIncrement(filename, clean_lines, linenum, error):
  """Checks for invalid increment *count++.

  For example following function:
  void increment_counter(int* count) {
    *count++;
  }
  is invalid, because it effectively does count++, moving pointer, and should
  be replaced with ++*count, (*count)++ or *count += 1.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    error: The function to call with any errors found.
  """
  line = clean_lines.elided[linenum]
  if _RE_PATTERN_INVALID_INCREMENT.match(line):
    error(filename, linenum, 'runtime/invalid_increment', 5,
          'Changing pointer instead of value (or unused value of operator*).')


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def IsMacroDefinition(clean_lines, linenum):
  if Search(r'^#define', clean_lines[linenum]):
    return True

  if linenum > 0 and Search(r'\\$', clean_lines[linenum - 1]):
    return True

  return False


def IsForwardClassDeclaration(clean_lines, linenum):
  return Match(r'^\s*(\btemplate\b)*.*class\s+\w+;\s*$', clean_lines[linenum])


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class _BlockInfo(object):
  """Stores information about a generic block of code."""

  def __init__(self, seen_open_brace):
    self.seen_open_brace = seen_open_brace
    self.open_parentheses = 0
    self.inline_asm = _NO_ASM
2004
    self.check_namespace_indentation = False
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  def CheckBegin(self, filename, clean_lines, linenum, error):
    """Run checks that applies to text up to the opening brace.

    This is mostly for checking the text after the class identifier
    and the "{", usually where the base class is specified.  For other
    blocks, there isn't much to check, so we always pass.

    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.
    """
    pass

  def CheckEnd(self, filename, clean_lines, linenum, error):
    """Run checks that applies to text after the closing brace.

    This is mostly used for checking end of namespace comments.

    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.
    """
    pass

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  def IsBlockInfo(self):
    """Returns true if this block is a _BlockInfo.

    This is convenient for verifying that an object is an instance of
    a _BlockInfo, but not an instance of any of the derived classes.

    Returns:
      True for this class, False for derived classes.
    """
    return self.__class__ == _BlockInfo


class _ExternCInfo(_BlockInfo):
  """Stores information about an 'extern "C"' block."""

  def __init__(self):
    _BlockInfo.__init__(self, True)

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class _ClassInfo(_BlockInfo):
  """Stores information about a class."""

  def __init__(self, name, class_or_struct, clean_lines, linenum):
    _BlockInfo.__init__(self, False)
    self.name = name
    self.starting_linenum = linenum
    self.is_derived = False
2061
    self.check_namespace_indentation = True
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    if class_or_struct == 'struct':
      self.access = 'public'
      self.is_struct = True
    else:
      self.access = 'private'
      self.is_struct = False

    # Remember initial indentation level for this class.  Using raw_lines here
    # instead of elided to account for leading comments.
2071
    self.class_indent = GetIndentLevel(clean_lines.raw_lines[linenum])
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    # Try to find the end of the class.  This will be confused by things like:
    #   class A {
    #   } *x = { ...
    #
    # But it's still good enough for CheckSectionSpacing.
    self.last_line = 0
    depth = 0
    for i in range(linenum, clean_lines.NumLines()):
      line = clean_lines.elided[i]
      depth += line.count('{') - line.count('}')
      if not depth:
        self.last_line = i
        break

  def CheckBegin(self, filename, clean_lines, linenum, error):
    # Look for a bare ':'
    if Search('(^|[^:]):($|[^:])', clean_lines.elided[linenum]):
      self.is_derived = True

  def CheckEnd(self, filename, clean_lines, linenum, error):
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    # If there is a DISALLOW macro, it should appear near the end of
    # the class.
    seen_last_thing_in_class = False
    for i in xrange(linenum - 1, self.starting_linenum, -1):
      match = Search(
          r'\b(DISALLOW_COPY_AND_ASSIGN|DISALLOW_IMPLICIT_CONSTRUCTORS)\(' +
          self.name + r'\)',
          clean_lines.elided[i])
      if match:
        if seen_last_thing_in_class:
          error(filename, i, 'readability/constructors', 3,
                match.group(1) + ' should be the last thing in the class')
        break

      if not Match(r'^\s*$', clean_lines.elided[i]):
        seen_last_thing_in_class = True

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    # Check that closing brace is aligned with beginning of the class.
    # Only do this if the closing brace is indented by only whitespaces.
    # This means we will not check single-line class definitions.
    indent = Match(r'^( *)\}', clean_lines.elided[linenum])
    if indent and len(indent.group(1)) != self.class_indent:
      if self.is_struct:
        parent = 'struct ' + self.name
      else:
        parent = 'class ' + self.name
      error(filename, linenum, 'whitespace/indent', 3,
            'Closing brace should be aligned with beginning of %s' % parent)


class _NamespaceInfo(_BlockInfo):
  """Stores information about a namespace."""

  def __init__(self, name, linenum):
    _BlockInfo.__init__(self, False)
    self.name = name or ''
    self.starting_linenum = linenum
2130
    self.check_namespace_indentation = True
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  def CheckEnd(self, filename, clean_lines, linenum, error):
    """Check end of namespace comments."""
    line = clean_lines.raw_lines[linenum]

    # Check how many lines is enclosed in this namespace.  Don't issue
    # warning for missing namespace comments if there aren't enough
    # lines.  However, do apply checks if there is already an end of
    # namespace comment and it's incorrect.
    #
    # TODO(unknown): We always want to check end of namespace comments
    # if a namespace is large, but sometimes we also want to apply the
    # check if a short namespace contained nontrivial things (something
    # other than forward declarations).  There is currently no logic on
    # deciding what these nontrivial things are, so this check is
    # triggered by namespace size only, which works most of the time.
    if (linenum - self.starting_linenum < 10
        and not Match(r'};*\s*(//|/\*).*\bnamespace\b', line)):
      return

    # Look for matching comment at end of namespace.
    #
    # Note that we accept C style "/* */" comments for terminating
    # namespaces, so that code that terminate namespaces inside
    # preprocessor macros can be cpplint clean.
    #
    # We also accept stuff like "// end of namespace <name>." with the
    # period at the end.
    #
    # Besides these, we don't accept anything else, otherwise we might
    # get false negatives when existing comment is a substring of the
    # expected namespace.
    if self.name:
      # Named namespace
      if not Match((r'};*\s*(//|/\*).*\bnamespace\s+' + re.escape(self.name) +
                    r'[\*/\.\\\s]*$'),
                   line):
        error(filename, linenum, 'readability/namespace', 5,
              'Namespace should be terminated with "// namespace %s"' %
              self.name)
    else:
      # Anonymous namespace
      if not Match(r'};*\s*(//|/\*).*\bnamespace[\*/\.\\\s]*$', line):
2174 2175 2176 2177 2178 2179 2180 2181 2182
        # If "// namespace anonymous" or "// anonymous namespace (more text)",
        # mention "// anonymous namespace" as an acceptable form
        if Match(r'}.*\b(namespace anonymous|anonymous namespace)\b', line):
          error(filename, linenum, 'readability/namespace', 5,
                'Anonymous namespace should be terminated with "// namespace"'
                ' or "// anonymous namespace"')
        else:
          error(filename, linenum, 'readability/namespace', 5,
                'Anonymous namespace should be terminated with "// namespace"')
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class _PreprocessorInfo(object):
  """Stores checkpoints of nesting stacks when #if/#else is seen."""

  def __init__(self, stack_before_if):
    # The entire nesting stack before #if
    self.stack_before_if = stack_before_if

    # The entire nesting stack up to #else
    self.stack_before_else = []

    # Whether we have already seen #else or #elif
    self.seen_else = False


2199
class NestingState(object):
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
  """Holds states related to parsing braces."""

  def __init__(self):
    # Stack for tracking all braces.  An object is pushed whenever we
    # see a "{", and popped when we see a "}".  Only 3 types of
    # objects are possible:
    # - _ClassInfo: a class or struct.
    # - _NamespaceInfo: a namespace.
    # - _BlockInfo: some other type of block.
    self.stack = []

2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221
    # Top of the previous stack before each Update().
    #
    # Because the nesting_stack is updated at the end of each line, we
    # had to do some convoluted checks to find out what is the current
    # scope at the beginning of the line.  This check is simplified by
    # saving the previous top of nesting stack.
    #
    # We could save the full stack, but we only need the top.  Copying
    # the full nesting stack would slow down cpplint by ~10%.
    self.previous_stack_top = []

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    # Stack of _PreprocessorInfo objects.
    self.pp_stack = []

  def SeenOpenBrace(self):
    """Check if we have seen the opening brace for the innermost block.

    Returns:
      True if we have seen the opening brace, False if the innermost
      block is still expecting an opening brace.
    """
    return (not self.stack) or self.stack[-1].seen_open_brace

  def InNamespaceBody(self):
    """Check if we are currently one level inside a namespace body.

    Returns:
      True if top of the stack is a namespace block, False otherwise.
    """
    return self.stack and isinstance(self.stack[-1], _NamespaceInfo)

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  def InExternC(self):
    """Check if we are currently one level inside an 'extern "C"' block.

    Returns:
      True if top of the stack is an extern block, False otherwise.
    """
    return self.stack and isinstance(self.stack[-1], _ExternCInfo)

  def InClassDeclaration(self):
    """Check if we are currently one level inside a class or struct declaration.

    Returns:
      True if top of the stack is a class/struct, False otherwise.
    """
    return self.stack and isinstance(self.stack[-1], _ClassInfo)

  def InAsmBlock(self):
    """Check if we are currently one level inside an inline ASM block.

    Returns:
      True if the top of the stack is a block containing inline ASM.
    """
    return self.stack and self.stack[-1].inline_asm != _NO_ASM

  def InTemplateArgumentList(self, clean_lines, linenum, pos):
    """Check if current position is inside template argument list.

    Args:
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      pos: position just after the suspected template argument.
    Returns:
      True if (linenum, pos) is inside template arguments.
    """
    while linenum < clean_lines.NumLines():
      # Find the earliest character that might indicate a template argument
      line = clean_lines.elided[linenum]
      match = Match(r'^[^{};=\[\]\.<>]*(.)', line[pos:])
      if not match:
        linenum += 1
        pos = 0
        continue
      token = match.group(1)
      pos += len(match.group(0))

      # These things do not look like template argument list:
      #   class Suspect {
      #   class Suspect x; }
      if token in ('{', '}', ';'): return False

      # These things look like template argument list:
      #   template <class Suspect>
      #   template <class Suspect = default_value>
      #   template <class Suspect[]>
      #   template <class Suspect...>
      if token in ('>', '=', '[', ']', '.'): return True

      # Check if token is an unmatched '<'.
      # If not, move on to the next character.
      if token != '<':
        pos += 1
        if pos >= len(line):
          linenum += 1
          pos = 0
        continue

      # We can't be sure if we just find a single '<', and need to
      # find the matching '>'.
      (_, end_line, end_pos) = CloseExpression(clean_lines, linenum, pos - 1)
      if end_pos < 0:
        # Not sure if template argument list or syntax error in file
        return False
      linenum = end_line
      pos = end_pos
    return False

2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
  def UpdatePreprocessor(self, line):
    """Update preprocessor stack.

    We need to handle preprocessors due to classes like this:
      #ifdef SWIG
      struct ResultDetailsPageElementExtensionPoint {
      #else
      struct ResultDetailsPageElementExtensionPoint : public Extension {
      #endif

    We make the following assumptions (good enough for most files):
    - Preprocessor condition evaluates to true from #if up to first
      #else/#elif/#endif.

    - Preprocessor condition evaluates to false from #else/#elif up
      to #endif.  We still perform lint checks on these lines, but
      these do not affect nesting stack.

    Args:
      line: current line to check.
    """
    if Match(r'^\s*#\s*(if|ifdef|ifndef)\b', line):
      # Beginning of #if block, save the nesting stack here.  The saved
      # stack will allow us to restore the parsing state in the #else case.
      self.pp_stack.append(_PreprocessorInfo(copy.deepcopy(self.stack)))
    elif Match(r'^\s*#\s*(else|elif)\b', line):
      # Beginning of #else block
      if self.pp_stack:
        if not self.pp_stack[-1].seen_else:
          # This is the first #else or #elif block.  Remember the
          # whole nesting stack up to this point.  This is what we
          # keep after the #endif.
          self.pp_stack[-1].seen_else = True
          self.pp_stack[-1].stack_before_else = copy.deepcopy(self.stack)

        # Restore the stack to how it was before the #if
        self.stack = copy.deepcopy(self.pp_stack[-1].stack_before_if)
      else:
        # TODO(unknown): unexpected #else, issue warning?
        pass
    elif Match(r'^\s*#\s*endif\b', line):
      # End of #if or #else blocks.
      if self.pp_stack:
        # If we saw an #else, we will need to restore the nesting
        # stack to its former state before the #else, otherwise we
        # will just continue from where we left off.
        if self.pp_stack[-1].seen_else:
          # Here we can just use a shallow copy since we are the last
          # reference to it.
          self.stack = self.pp_stack[-1].stack_before_else
        # Drop the corresponding #if
        self.pp_stack.pop()
      else:
        # TODO(unknown): unexpected #endif, issue warning?
        pass

2374
  # TODO(unknown): Update() is too long, but we will refactor later.
2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
  def Update(self, filename, clean_lines, linenum, error):
    """Update nesting state with current line.

    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.
    """
    line = clean_lines.elided[linenum]

2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
    # Remember top of the previous nesting stack.
    #
    # The stack is always pushed/popped and not modified in place, so
    # we can just do a shallow copy instead of copy.deepcopy.  Using
    # deepcopy would slow down cpplint by ~28%.
    if self.stack:
      self.previous_stack_top = self.stack[-1]
    else:
      self.previous_stack_top = None

    # Update pp_stack
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    self.UpdatePreprocessor(line)

    # Count parentheses.  This is to avoid adding struct arguments to
    # the nesting stack.
    if self.stack:
      inner_block = self.stack[-1]
      depth_change = line.count('(') - line.count(')')
      inner_block.open_parentheses += depth_change

      # Also check if we are starting or ending an inline assembly block.
      if inner_block.inline_asm in (_NO_ASM, _END_ASM):
        if (depth_change != 0 and
            inner_block.open_parentheses == 1 and
            _MATCH_ASM.match(line)):
          # Enter assembly block
          inner_block.inline_asm = _INSIDE_ASM
        else:
          # Not entering assembly block.  If previous line was _END_ASM,
          # we will now shift to _NO_ASM state.
          inner_block.inline_asm = _NO_ASM
      elif (inner_block.inline_asm == _INSIDE_ASM and
            inner_block.open_parentheses == 0):
        # Exit assembly block
        inner_block.inline_asm = _END_ASM

    # Consume namespace declaration at the beginning of the line.  Do
    # this in a loop so that we catch same line declarations like this:
    #   namespace proto2 { namespace bridge { class MessageSet; } }
    while True:
      # Match start of namespace.  The "\b\s*" below catches namespace
      # declarations even if it weren't followed by a whitespace, this
      # is so that we don't confuse our namespace checker.  The
      # missing spaces will be flagged by CheckSpacing.
      namespace_decl_match = Match(r'^\s*namespace\b\s*([:\w]+)?(.*)$', line)
      if not namespace_decl_match:
        break

      new_namespace = _NamespaceInfo(namespace_decl_match.group(1), linenum)
      self.stack.append(new_namespace)

      line = namespace_decl_match.group(2)
      if line.find('{') != -1:
        new_namespace.seen_open_brace = True
        line = line[line.find('{') + 1:]

    # Look for a class declaration in whatever is left of the line
    # after parsing namespaces.  The regexp accounts for decorated classes
    # such as in:
    #   class LOCKABLE API Object {
    #   };
    class_decl_match = Match(
2448 2449 2450
        r'^(\s*(?:template\s*<[\w\s<>,:]*>\s*)?'
        r'(class|struct)\s+(?:[A-Z_]+\s+)*(\w+(?:::\w+)*))'
        r'(.*)$', line)
2451 2452
    if (class_decl_match and
        (not self.stack or self.stack[-1].open_parentheses == 0)):
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467
      # We do not want to accept classes that are actually template arguments:
      #   template <class Ignore1,
      #             class Ignore2 = Default<Args>,
      #             template <Args> class Ignore3>
      #   void Function() {};
      #
      # To avoid template argument cases, we scan forward and look for
      # an unmatched '>'.  If we see one, assume we are inside a
      # template argument list.
      end_declaration = len(class_decl_match.group(1))
      if not self.InTemplateArgumentList(clean_lines, linenum, end_declaration):
        self.stack.append(_ClassInfo(
            class_decl_match.group(3), class_decl_match.group(2),
            clean_lines, linenum))
        line = class_decl_match.group(4)
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513

    # If we have not yet seen the opening brace for the innermost block,
    # run checks here.
    if not self.SeenOpenBrace():
      self.stack[-1].CheckBegin(filename, clean_lines, linenum, error)

    # Update access control if we are inside a class/struct
    if self.stack and isinstance(self.stack[-1], _ClassInfo):
      classinfo = self.stack[-1]
      access_match = Match(
          r'^(.*)\b(public|private|protected|signals)(\s+(?:slots\s*)?)?'
          r':(?:[^:]|$)',
          line)
      if access_match:
        classinfo.access = access_match.group(2)

        # Check that access keywords are indented +1 space.  Skip this
        # check if the keywords are not preceded by whitespaces.
        indent = access_match.group(1)
        if (len(indent) != classinfo.class_indent + 1 and
            Match(r'^\s*$', indent)):
          if classinfo.is_struct:
            parent = 'struct ' + classinfo.name
          else:
            parent = 'class ' + classinfo.name
          slots = ''
          if access_match.group(3):
            slots = access_match.group(3)
          error(filename, linenum, 'whitespace/indent', 3,
                '%s%s: should be indented +1 space inside %s' % (
                    access_match.group(2), slots, parent))

    # Consume braces or semicolons from what's left of the line
    while True:
      # Match first brace, semicolon, or closed parenthesis.
      matched = Match(r'^[^{;)}]*([{;)}])(.*)$', line)
      if not matched:
        break

      token = matched.group(1)
      if token == '{':
        # If namespace or class hasn't seen a opening brace yet, mark
        # namespace/class head as complete.  Push a new block onto the
        # stack otherwise.
        if not self.SeenOpenBrace():
          self.stack[-1].seen_open_brace = True
2514 2515
        elif Match(r'^extern\s*"[^"]*"\s*\{', line):
          self.stack.append(_ExternCInfo())
2516 2517 2518 2519
        else:
          self.stack.append(_BlockInfo(True))
          if _MATCH_ASM.match(line):
            self.stack[-1].inline_asm = _BLOCK_ASM
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      elif token == ';' or token == ')':
        # If we haven't seen an opening brace yet, but we already saw
        # a semicolon, this is probably a forward declaration.  Pop
        # the stack for these.
        #
        # Similarly, if we haven't seen an opening brace yet, but we
        # already saw a closing parenthesis, then these are probably
        # function arguments with extra "class" or "struct" keywords.
        # Also pop these stack for these.
        if not self.SeenOpenBrace():
          self.stack.pop()
      else:  # token == '}'
        # Perform end of block checks and pop the stack.
        if self.stack:
          self.stack[-1].CheckEnd(filename, clean_lines, linenum, error)
          self.stack.pop()
      line = matched.group(2)

  def InnermostClass(self):
    """Get class info on the top of the stack.

    Returns:
      A _ClassInfo object if we are inside a class, or None otherwise.
    """
    for i in range(len(self.stack), 0, -1):
      classinfo = self.stack[i - 1]
      if isinstance(classinfo, _ClassInfo):
        return classinfo
    return None

  def CheckCompletedBlocks(self, filename, error):
    """Checks that all classes and namespaces 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.
    """
    # Note: This test can result in false positives if #ifdef constructs
    # get in the way of brace matching. See the testBuildClass test in
    # cpplint_unittest.py for an example of this.
    for obj in self.stack:
      if isinstance(obj, _ClassInfo):
        error(filename, obj.starting_linenum, 'build/class', 5,
              'Failed to find complete declaration of class %s' %
              obj.name)
      elif isinstance(obj, _NamespaceInfo):
        error(filename, obj.starting_linenum, 'build/namespaces', 5,
              'Failed to find complete declaration of namespace %s' %
              obj.name)


def CheckForNonStandardConstructs(filename, clean_lines, linenum,
                                  nesting_state, error):
  r"""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.

  Additionally, check for constructor/destructor style violations and reference
  members, as it is very convenient to do so while checking for
  gcc-2 compliance.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
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    nesting_state: A NestingState instance which maintains information about
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                   the current stack of nested blocks being parsed.
    error: A callable to which errors are reported, which takes 4 arguments:
           filename, line number, error level, and message
  """

  # Remove comments from the line, but leave in strings for now.
  line = clean_lines.lines[linenum]

  if Search(r'printf\s*\(.*".*%[-+ ]?\d*q', line):
    error(filename, linenum, 'runtime/printf_format', 3,
          '%q in format strings is deprecated.  Use %ll instead.')

  if Search(r'printf\s*\(.*".*%\d+\$', line):
    error(filename, linenum, 'runtime/printf_format', 2,
          '%N$ formats are unconventional.  Try rewriting to avoid them.')

  # Remove escaped backslashes before looking for undefined escapes.
  line = line.replace('\\\\', '')

  if Search(r'("|\').*\\(%|\[|\(|{)', line):
    error(filename, linenum, 'build/printf_format', 3,
          '%, [, (, and { are undefined character escapes.  Unescape them.')

  # For the rest, work with both comments and strings removed.
  line = clean_lines.elided[linenum]

  if Search(r'\b(const|volatile|void|char|short|int|long'
            r'|float|double|signed|unsigned'
            r'|schar|u?int8|u?int16|u?int32|u?int64)'
            r'\s+(register|static|extern|typedef)\b',
            line):
    error(filename, linenum, 'build/storage_class', 5,
          'Storage class (static, extern, typedef, etc) should be first.')

  if Match(r'\s*#\s*endif\s*[^/\s]+', line):
    error(filename, linenum, 'build/endif_comment', 5,
          'Uncommented text after #endif is non-standard.  Use a comment.')

  if Match(r'\s*class\s+(\w+\s*::\s*)+\w+\s*;', line):
    error(filename, linenum, 'build/forward_decl', 5,
          'Inner-style forward declarations are invalid.  Remove this line.')

  if Search(r'(\w+|[+-]?\d+(\.\d*)?)\s*(<|>)\?=?\s*(\w+|[+-]?\d+)(\.\d*)?',
            line):
    error(filename, linenum, 'build/deprecated', 3,
          '>? and <? (max and min) operators are non-standard and deprecated.')

  if Search(r'^\s*const\s*string\s*&\s*\w+\s*;', line):
    # TODO(unknown): Could it be expanded safely to arbitrary references,
    # without triggering too many false positives? The first
    # attempt triggered 5 warnings for mostly benign code in the regtest, hence
    # the restriction.
    # Here's the original regexp, for the reference:
    # type_name = r'\w+((\s*::\s*\w+)|(\s*<\s*\w+?\s*>))?'
    # r'\s*const\s*' + type_name + '\s*&\s*\w+\s*;'
    error(filename, linenum, 'runtime/member_string_references', 2,
          'const string& members are dangerous. It is much better to use '
          'alternatives, such as pointers or simple constants.')

  # Everything else in this function operates on class declarations.
  # Return early if the top of the nesting stack is not a class, or if
  # the class head is not completed yet.
  classinfo = nesting_state.InnermostClass()
  if not classinfo or not classinfo.seen_open_brace:
    return

  # 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.
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