parameters: (filename, clean_lines, linenum, error)
docstring: Check if line contains a redundant "virtual" function-specifier.
  
    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.
docstring_summary: Check if line contains a redundant "virtual" function-specifier.
docstring_tokens: Check if line contains a redundant virtual function - specifier .
function: def CheckRedundantVirtual(filename, clean_lines, linenum, error):
    """Check if line contains a redundant "virtual" function-specifier.
  
    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.
    """
    # Look for "virtual" on current line.
    line = clean_lines.elided[linenum]
    virtual = Match(r'^(.*)(\bvirtual\b)(.*)$', line)
    if not virtual: return
  
    # Ignore "virtual" keywords that are near access-specifiers.  These
    # are only used in class base-specifier and do not apply to member
    # functions.
    if (Search(r'\b(public|protected|private)\s+$', virtual.group(1)) or
        Match(r'^\s+(public|protected|private)\b', virtual.group(3))):
      return
  
    # Ignore the "virtual" keyword from virtual base classes.  Usually
    # there is a column on the same line in these cases (virtual base
    # classes are rare in google3 because multiple inheritance is rare).
    if Match(r'^.*[^:]:[^:].*$', line): return
  
    # Look for the next opening parenthesis.  This is the start of the
    # parameter list (possibly on the next line shortly after virtual).
    # TODO(unknown): doesn't work if there are virtual functions with
    # decltype() or other things that use parentheses, but csearch suggests
    # that this is rare.
    end_col = -1
    end_line = -1
    start_col = len(virtual.group(2))
    for start_line in xrange(linenum, min(linenum + 3, clean_lines.NumLines())):
      line = clean_lines.elided[start_line][start_col:]
      parameter_list = Match(r'^([^(]*)\(', line)
      if parameter_list:
        # Match parentheses to find the end of the parameter list
        (_, end_line, end_col) = CloseExpression(
            clean_lines, start_line, start_col + len(parameter_list.group(1)))
        break
      start_col = 0
  
    if end_col < 0:
      return  # Couldn't find end of parameter list, give up
  
    # Look for "override" or "final" after the parameter list
    # (possibly on the next few lines).
    for i in xrange(end_line, min(end_line + 3, clean_lines.NumLines())):
      line = clean_lines.elided[i][end_col:]
      match = Search(r'\b(override|final)\b', line)
      if match:
        error(filename, linenum, 'readability/inheritance', 4,
              ('"virtual" is redundant since function is '
               'already declared as "%s"' % match.group(1)))
  
      # Set end_col to check whole lines after we are done with the
      # first line.
      end_col = 0
      if Search(r'[^\w]\s*$', line):
        break
function_tokens: def CheckRedundantVirtual ( filename , clean_lines , linenum , error ) : # Look for "virtual" on current line. line = clean_lines . elided [ linenum ] virtual = Match ( r'^(.*)(\bvirtual\b)(.*)$' , line ) if not virtual : return # Ignore "virtual" keywords that are near access-specifiers.  These # are only used in class base-specifier and do not apply to member # functions. if ( Search ( r'\b(public|protected|private)\s+$' , virtual . group ( 1 ) ) or Match ( r'^\s+(public|protected|private)\b' , virtual . group ( 3 ) ) ) : return # Ignore the "virtual" keyword from virtual base classes.  Usually # there is a column on the same line in these cases (virtual base # classes are rare in google3 because multiple inheritance is rare). if Match ( r'^.*[^:]:[^:].*$' , line ) : return # Look for the next opening parenthesis.  This is the start of the # parameter list (possibly on the next line shortly after virtual). # TODO(unknown): doesn't work if there are virtual functions with # decltype() or other things that use parentheses, but csearch suggests # that this is rare. end_col = - 1 end_line = - 1 start_col = len ( virtual . group ( 2 ) ) for start_line in xrange ( linenum , min ( linenum + 3 , clean_lines . NumLines ( ) ) ) : line = clean_lines . elided [ start_line ] [ start_col : ] parameter_list = Match ( r'^([^(]*)\(' , line ) if parameter_list : # Match parentheses to find the end of the parameter list ( _ , end_line , end_col ) = CloseExpression ( clean_lines , start_line , start_col + len ( parameter_list . group ( 1 ) ) ) break start_col = 0 if end_col < 0 : return # Couldn't find end of parameter list, give up # Look for "override" or "final" after the parameter list # (possibly on the next few lines). for i in xrange ( end_line , min ( end_line + 3 , clean_lines . NumLines ( ) ) ) : line = clean_lines . elided [ i ] [ end_col : ] match = Search ( r'\b(override|final)\b' , line ) if match : error ( filename , linenum , 'readability/inheritance' , 4 , ( '"virtual" is redundant since function is ' 'already declared as "%s"' % match . group ( 1 ) ) ) # Set end_col to check whole lines after we are done with the # first line. end_col = 0 if Search ( r'[^\w]\s*$' , line ) : break