isException = function (operator, parent, i) {
  var previous = parent.content[i - 1] || false,
      doublePrevious = parent.content[i - 2] || false,
      next = parent.content[i + 1] || false;

  if (isNegativeNumber(operator, next, previous, doublePrevious)) {
    return true;
  }

  if (isDivider(operator, next, previous)) {
    return true;
  }

  if (isUnicode(operator, previous)) {
    return true;
  }

  if (isImport(operator, parent)) {
    return true;
  }

  if (isPartialIdent(operator, next, previous)) {
    return true;
  }

  return false;
}
Determine if operator is exception

@param {string} operator - The operator
@param {Object} parent - The parent node
@param {Object} i - The node index
@returns {bool} true / false