Function CheckStyle

steps/cpplint.py:4820–4943

Checks rules from the 'C++ style rules' section of cppguide.html. Most of these rules are hard to test (naming, comment style), but we do what we can. In particular we check for 2-space indents, line lengths, tab usage, spaces inside code, etc. Args: filename: The name of the current

(filename, clean_lines, linenum, file_extension, nesting_state,
               error)

def CheckStyle(filename, clean_lines, linenum, file_extension, nesting_state,
               error):
  """Checks rules from the 'C++ style rules' section of cppguide.html.

  Most of these rules are hard to test (naming, comment style), but we
  do what we can.  In particular we check for 2-space indents, line lengths,
  tab usage, spaces inside code, etc.

  Args:
    filename: The name of the current file.
    clean_lines: A CleansedLines instance containing the file.
    linenum: The number of the line to check.
    file_extension: The extension (without the dot) of the filename.
    nesting_state: A NestingState instance which maintains information about
                   the current stack of nested blocks being parsed.
    error: The function to call with any errors found.
  """

  # Don't use "elided" lines here, otherwise we can't check commented lines.
  # Don't want to use "raw" either, because we don't want to check inside C++11
  # raw strings,
  raw_lines = clean_lines.lines_without_raw_strings
  line = raw_lines[linenum]
  prev = raw_lines[linenum - 1] if linenum > 0 else ''

  if line.find('\t') != -1:
    error(filename, linenum, 'whitespace/tab', 1,
          'Tab found; better to use spaces')

  # One or three blank spaces at the beginning of the line is weird; it's
  # hard to reconcile that with 2-space indents.
  # NOTE: here are the conditions rob pike used for his tests.  Mine aren't
  # as sophisticated, but it may be worth becoming so:  RLENGTH==initial_spaces
  # if(RLENGTH > 20) complain = 0;
  # if(match($0, " +(error|private|public|protected):")) complain = 0;
  # if(match(prev, "&& *$")) complain = 0;
  # if(match(prev, "\\|\\| *$")) complain = 0;
  # if(match(prev, "[\",=><] *$")) complain = 0;
  # if(match($0, " <<")) complain = 0;
  # if(match(prev, " +for \\(")) complain = 0;
  # if(prevodd && match(prevprev, " +for \\(")) complain = 0;
  scope_or_label_pattern = r'\s*(?:public|private|protected|signals)(?:\s+(?:slots\s*)?)?:\s*\\?$'
  classinfo = nesting_state.InnermostClass()
  initial_spaces = 0
  cleansed_line = clean_lines.elided[linenum]
  while initial_spaces < len(line) and line[initial_spaces] == ' ':
    initial_spaces += 1
  # There are certain situations we allow one space, notably for
  # section labels, and also lines containing multi-line raw strings.
  # We also don't check for lines that look like continuation lines
  # (of lines ending in double quotes, commas, equals, or angle brackets)
  # because the rules for how to indent those are non-trivial.
  if (not Search(r'[",=><] *$', prev) and
      (initial_spaces == 1 or initial_spaces == 3) and
      not Match(scope_or_label_pattern, cleansed_line) and
      not (clean_lines.raw_lines[linenum] != line and
           Match(r'^\s*""', line))):
    error(filename, linenum, 'whitespace/indent', 3,