utils/lint/cpp_lint.py

   1 #!/usr/bin/python
   2 #
   3 # Checks C++ files to make sure they conform to LLVM standards, as specified in
   4 # http://llvm.org/docs/CodingStandards.html .
   5 #
   6 # TODO: add unittests for the verifier functions:
   7 # http://docs.python.org/library/unittest.html .
   8
   9 import common_lint
  10 import re
  11 import sys
  12
  13 def VerifyIncludes(filename, lines):
  14   """Makes sure the #includes are in proper order and no disallows files are
  15   #included.
  16
  17   Args:
  18     filename: the file under consideration as string
  19     lines: contents of the file as string array
  20   """
  21   lint = []
  22
  23   include_gtest_re = re.compile(r'^#include "gtest/(.*)"')
  24   include_llvm_re = re.compile(r'^#include "llvm/(.*)"')
  25   include_support_re = re.compile(r'^#include "(Support/.*)"')
  26   include_config_re = re.compile(r'^#include "(Config/.*)"')
  27   include_system_re = re.compile(r'^#include <(.*)>')
  28
  29   DISALLOWED_SYSTEM_HEADERS = ['iostream']
  30
  31   line_num = 1
  32   prev_config_header = None
  33   prev_system_header = None
  34   for line in lines:
  35     # TODO: implement private headers
  36     # TODO: implement gtest headers
  37     # TODO: implement top-level llvm/* headers
  38     # TODO: implement llvm/Support/* headers
  39
  40     # Process Config/* headers
  41     config_header = include_config_re.match(line)
  42     if config_header:
  43       curr_config_header = config_header.group(1)
  44       if prev_config_header:
  45         if prev_config_header > curr_config_header:
  46           lint.append((filename, line_num,
  47                        'Config headers not in order: "%s" before "%s"' % (
  48                          prev_config_header, curr_config_header)))
  49
  50     # Process system headers
  51     system_header = include_system_re.match(line)
  52     if system_header:
  53       curr_system_header = system_header.group(1)
  54
  55       # Is it blacklisted?
  56       if curr_system_header in DISALLOWED_SYSTEM_HEADERS:
  57         lint.append((filename, line_num,
  58                      'Disallowed system header: <%s>' % curr_system_header))
  59       elif prev_system_header:
  60         # Make sure system headers are alphabetized amongst themselves
  61         if prev_system_header > curr_system_header:
  62           lint.append((filename, line_num,
  63                        'System headers not in order: <%s> before <%s>' % (
  64                          prev_system_header, curr_system_header)))
  65
  66       prev_system_header = curr_system_header
  67
  68     line_num += 1
  69
  70   return lint
  71
  72
  73 class CppLint(common_lint.BaseLint):
  74   MAX_LINE_LENGTH = 80
  75
  76   def RunOnFile(self, filename, lines):
  77     lint = []
  78     lint.extend(VerifyIncludes(filename, lines))
  79     lint.extend(common_lint.VerifyLineLength(filename, lines,
  80                                              CppLint.MAX_LINE_LENGTH))
  81     lint.extend(common_lint.VerifyTabs(filename, lines))
  82     lint.extend(common_lint.VerifyTrailingWhitespace(filename, lines))
  83     return lint
  84
  85
  86 def CppLintMain(filenames):
  87   all_lint = common_lint.RunLintOverAllFiles(CppLint(), filenames)
  88   for lint in all_lint:
  89     print '%s:%d:%s' % (lint[0], lint[1], lint[2])
  90   return 0
  91
  92
  93 if __name__ == '__main__':
  94   sys.exit(CppLintMain(sys.argv[1:]))