SyntaxSuggest::CleanDocument#join_heredoc!

# File tmp/rubies/ruby-4.0.0/lib/syntax_suggest/clean_document.rb, line 181
def join_heredoc!
  start_index_stack = []
  heredoc_beg_end_index = []
  lines.each do |line|
    line.lex.each do |lex_value|
      case lex_value.type
      when :on_heredoc_beg
        start_index_stack << line.index
      when :on_heredoc_end
        start_index = start_index_stack.pop
        end_index = line.index
        heredoc_beg_end_index << [start_index, end_index]
      end
    end
  end

  heredoc_groups = heredoc_beg_end_index.map { |start_index, end_index| @document[start_index..end_index] }

  join_groups(heredoc_groups)
  self
end