Function CheckOperatorSpacing

steps/cpplint.py:3809–3921

Checks for horizontal spacing around operators. 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.

(filename, clean_lines, linenum, error)

def CheckOperatorSpacing(filename, clean_lines, linenum, error):
  """Checks for horizontal spacing around operators.

  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]

  # Don't try to do spacing checks for operator methods.  Do this by
  # replacing the troublesome characters with something else,
  # preserving column position for all other characters.
  #
  # The replacement is done repeatedly to avoid false positives from
  # operators that call operators.
  while True:
    match = Match(r'^(.*\boperator\b)(\S+)(\s*\(.*)$', line)
    if match:
      line = match.group(1) + ('_' * len(match.group(2))) + match.group(3)
    else:
      break

  # We allow no-spaces around = within an if: "if ( (a=Foo()) == 0 )".
  # Otherwise not.  Note we only check for non-spaces on *both* sides;
  # sometimes people put non-spaces on one side when aligning ='s among
  # many lines (not that this is behavior that I approve of...)
  if ((Search(r'[\w.]=', line) or
       Search(r'=[\w.]', line))
      and not Search(r'\b(if|while|for) ', line)
      # Operators taken from [lex.operators] in C++11 standard.
      and not Search(r'(>=|<=|==|!=|&=|\^=|\|=|\+=|\*=|\/=|\%=)', line)
      and not Search(r'operator=', line)):
    error(filename, linenum, 'whitespace/operators', 4,
          'Missing spaces around =')

  # It's ok not to have spaces around binary operators like + - * /, but if
  # there's too little whitespace, we get concerned.  It's hard to tell,
  # though, so we punt on this one for now.  TODO.

  # You should always have whitespace around binary operators.
  #
  # Check <= and >= first to avoid false positives with < and >, then
  # check non-include lines for spacing around < and >.
  #
  # If the operator is followed by a comma, assume it's be used in a
  # macro context and don't do any checks.  This avoids false
  # positives.
  #
  # Note that && is not included here.  This is because there are too
  # many false positives due to RValue references.
  match = Search(r'[^<>=!\s](==|!=|<=|>=|\|\|)[^<>=!\s,;\)]', line)
  if match:
    error(filename, linenum, 'whitespace/operators', 3,
          'Missing spaces around %s' % match.group(1))
  elif not Match(r'#.*include', line):
    # Look for < that is not surrounded by spaces.  This is only