class RubyLex

def should_continue?(tokens)
  # Look at the last token and check if IRB need to continue reading next line.
  # Example code that should continue: `a\` `a +` `a.`
  # Trailing spaces, newline, comments are skipped
  return true if tokens.last&.event == :on_sp && tokens.last.tok == "\\\n"
  tokens.reverse_each do |token|
    case token.event
    when :on_sp, :on_nl, :on_ignored_nl, :on_comment, :on_embdoc_beg, :on_embdoc, :on_embdoc_end
      # Skip
    when :on_regexp_end, :on_heredoc_end, :on_semicolon
      # State is EXPR_BEG but should not continue
      return false
    else
      # Endless range should not continue
      return false if token.event == :on_op && token.tok.match?(/\A\.\.\.?\z/)
      # EXPR_DOT and most of the EXPR_BEG should continue
      return token.state.anybits?(Ripper::EXPR_BEG | Ripper::EXPR_DOT)
    end
  end
  false
end