class RuboCop::Cop::Style::StringLiterals

def autocorrect(node)
  @corrections << lambda do |corrector|
    replacement = node.loc.begin.is?('"') ? "'" : '"'
    corrector.replace(node.loc.begin, replacement)
    corrector.replace(node.loc.end, replacement)
  end
end

def message(*)
  if style == :single_quotes
    "Prefer single-quoted strings when you don't need string " \
    'interpolation or special symbols.'
  else
    'Prefer double-quoted strings unless you need single quotes to ' \
    'avoid extra backslashes for escaping.'
  end
end

def offense?(node)
  src = node.loc.expression.source
  return false if src =~ /^(%[qQ]?|\?|<<-)/i
  src !~ if style == :single_quotes
           # regex matches IF there is a ' or there is a \\ in the
           # string that is not preceeded/followed by another \\
           # (e.g. "\\x34") but not "\\\\"
           /' | (?<! \\) \\{2}* \\ (?! \\)/x
         else
           /" | \\/x
         end
end