extract_call_seq

# File lib/rdoc/comment.rb, line 83
  def extract_call_seq method
    # we must handle situations like the above followed by an unindented first
    # comment.  The difficulty is to make sure not to match lines starting
    # with ARGF at the same indent, but that are after the first description
    # paragraph.
    if @text =~ /^\s*:?call-seq:(.*?(?:\S).*?)^\s*$/ then
      all_start, all_stop = $~.offset(0)
      seq_start, seq_stop = $~.offset(1)

      # we get the following lines that start with the leading word at the
      # same indent, even if they have blank lines before
      if $1 =~ /(^\s*\n)+^(\s*\w+)/ then
        leading = $2 # ' *    ARGF' in the example above
        re = %
          \A(
             (^\s*\n)+
             (^#{Regexp.escape leading}.*?\n)+
            )+
          ^\s*$
        %m

        if @text[seq_stop..-1] =~ re then
          all_stop = seq_stop + $~.offset(0).last
          seq_stop = seq_stop + $~.offset(1).last
        end
      end

      seq = @text[seq_start..seq_stop]
      seq.gsub!(/^\s*(\S|\n)/, '\1')
      @text.slice! all_start...all_stop

      method.call_seq = seq.chomp

    elsif @text.sub!(/^\s*:?call-seq:(.*?)(^\s*$|\z)/, '') then
      seq = $1
      seq.gsub!(/^\s*/, '')
      method.call_seq = seq
    end

    method
  end