=begin
 * Name: SiSU information Structuring Universe - Structured information, Serialized Units
 * Author: Ralph Amissah
   * http://www.jus.uio.no/sisu
   * http://www.jus.uio.no/sisu/SiSU/download.html

 * Description: preprocessing, (document abstraction), data abstraction used in subsequent processing

 * Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Ralph Amissah

 * License: GPL 2 or later

  Summary of GPL 2

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation; either version 2 of the License, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along
  with this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

  If you have Internet connection, the latest version of the GPL should be
  available at these locations:
    http://www.fsf.org/licenses/gpl.html
    http://www.gnu.org/copyleft/gpl.html
    http://www.jus.uio.no/sisu/gpl2.fsf

  SiSU was first released to the public on January 4th 2005

  SiSU uses:

  *  Standard SiSU markup syntax,
  *  Standard SiSU meta-markup syntax, and the
  *  Standard SiSU object citation numbering and system

  © Ralph Amissah 1997, current 2007.
  All Rights Reserved.

 * Ralph Amissah: ralph@amissah.com
                  ralph.amissah@gmail.com
=end
module SiSU_DAL
  require "#{SiSU_lib}/defaults"
  require "#{SiSU_lib}/sysenv"
  require "#{SiSU_lib}/param"
  require "#{SiSU_lib}/dal_syntax"
  require "#{SiSU_lib}/dal_doc_str"
  require "#{SiSU_lib}/i18n"
  include SiSU_Env
  include SiSU_Param
  include SiSU_Viz
  include Syntax
  class Instantiate < SiSU_Param::Parameters::Instructions
    def initialize
      @@flag_vocab=0
      @@endnote={}
      @@endnote_array=@@word_mode=[]
      @@endnote_counter,@@endnote_counter_asterisk,@@endnote_counter_dag=1,1,1 #added
      @@line_mode=''
    end
  end
  class Source <Instantiate
    @@dal_array=[]
    @@fns=nil
    def initialize(opt)
      @opt=opt
      @@fns||@opt.fns
      @my_make_fns=SiSU_Env::Create_file.new(@opt.cmd,@opt.fns)
      @fnm=@my_make_fns.marshal_meta
      SiSU_Env::Create_system_link.new.images
    end
    def read                                                                     #creates dal
      begin
        dal=[]
        @@dal_array=[]
        @@fns=@opt.fns
        create_dal
      rescue; SiSU_Errors::Info_error.new($!,$@,@opt.cmd,@opt.fns).error
      ensure
        Instantiate.new
      end
    end
    def get                                                                      #reads dal, unless does not exist then creates first
      begin
        dal=[]
        unless @@fns==@opt.fns
          @@fns=@opt.fns
          @@dal_array=[]
        end
        dal=if @@dal_array.empty?; read_fnm
        else @@dal_array.dup #check
        end
      rescue; SiSU_Errors::Info_error.new($!,$@,@opt.cmd,@opt.fns).error
      ensure
        Instantiate.new
      end
    end
  protected
    def create_dal
      dal_array=[]
      tell=SiSU_Screen::Ansi.new(@opt.cmd,'Document Abstraction')
      tell.green_title_hi unless @opt.cmd =~/q/
      file_array=IO.readlines(@opt.fns,'')
      file_array.each do |l|
        if l =~/\r\n/; l.gsub!(/\r\n/,"\n")
        end
      end
      meta=file_array.dup
      meta=meta.join.split("\n\n") #check whether can be eliminated, some of these are large objects to have twice
      @md=SiSU_Param::Parameters::Instructions.new(meta,@opt).extract
      meta=nil
      dal=SiSU_DAL::Make.new(@md,file_array).song
      SiSU_Screen::Ansi.new(@md.cmd,@md.fns,"~meta/#{@md.fns}.meta").output if @md.cmd =~/v/
      tell=SiSU_Screen::Ansi.new(@md.cmd,"dal -> #{@my_make_fns.meta}") if @md.cmd =~/M/
      tell.txt_grey unless @md.cmd =~/q/
      dal.each{|s| dal_array << "#{s.strip}\n\n" unless s.strip.empty?}
      dal_array
    end
    def read_fnm
      dal=[]
      dal=if FileTest.file?(@fnm); File.open(@fnm){ |f| dal=Marshal.load(f)}
      else SiSU_DAL::Source.new(@opt).create_dal
      end
    end
  end
  class Output
    def initialize(md,data)
      @md,@data=md,data
      @my_make=SiSU_Env::Create_file.new(@md.cmd,@md.fns)
      dir=SiSU_Env::Info_env.new(@md.fns)
      @hard="#{dir.path.dal}/#{@md.fns}.meta"
    end
    def hard_output
      if @md.cmd =~/M/
        filename_meta=@my_make.file_meta
        @data.each {|s| filename_meta.puts s.strip + "\n\n" unless s.strip.empty?}
      else File.unlink(@hard) if FileTest.file?(@hard)
      end
    end
    def marshal
      marshal_meta=@my_make.marshal_meta
      File.open(marshal_meta,'w'){|f| Marshal.dump(@data.to_a,f)}
    end
  end
  class Make
    @@endnote={}
    @@endnote_array=@@word_mode=[]
    @@endnote_counter,@@endnote_counter_asterisk,@@endnote_counter_dag=1,1,1
    @@comment='%'
    @@dp=nil
    def initialize(md,data)
      @md,@data=md,data
      @@word_mode=[]
      @env=SiSU_Env::Info_env.new(@md.fns)
      @skin=SiSU_Env::Info_skin.new(@md)
      @dp=@@dp ||=SiSU_Env::Info_env.new.digest.pattern
      l=SiSU_Env::Standardise_language.new.file_to_language(@md.fns)
      @language=l[:l]
      @tr=SiSU_Translate::Source.new(@md,@language)
    end
    def reset
      @@flag_vocab=0
      @@endnote={}
      @@endnote_array=@@word_mode=[]
      @@endnote_counter,@@endnote_counter_asterisk,@@endnote_counter_dag=1,1,1
      @@line_mode=''
    end
    def song
      reset
      data=@data
      @metafile="#{@env.path.dal}/#{@md.fns}.meta"
      my_make_source_file=SiSU_Env::Create_file.new(@md.cmd,@md.fns)
      data=data.join.split("\n\n")
      data=SiSU_document_structure::Code.new(@md,data).code
      data_new=[]
      data.each do |x|
        data_new << if x =~ /\n\n/m; x.split(/\n\n+/)
        else x
        end
      end
      data=data_new.flatten
      data=substitutions_and_insertions?(data)
      data=Syntax::Markup.new(@md,data).songsheet
      data=character_check(data)
      data=images(data)
      data=SiSU_document_structure::Tables.new(@md,data).tables
      data=numbering_song(data) #tr issue
      data=endnotes(data)
      data=object_digest(data)
      meta=metadata(data)
      outputdata=data + meta
      if @md.cmd =~/[mM]/
        SiSU_DAL::Output.new(@md,outputdata).hard_output
        SiSU_DAL::Output.new(@md,outputdata).marshal
      end
      reset
      outputdata
    end
  protected
    def character_check(data)
      require 'iconv'
      reset
      @tuned_file=[]
      endnote_no=1
      data.each do |para|
        para.strip!
        para.gsub!(/^([12])~\?\s+/,'\1~ ')                                    #conditional header for incorporated document 2004w12
        para.gsub!(/^[{~}]\s*$/,'')
        para.gsub!(/^#{@@comment}.*/,'')                                       #remove comment and divider #%
        para.gsub!(/<~#>|~#\s*/,'<~#>')
        para.gsub!(/-#\s*/,'<-#><~#>')
        #para.gsub!(/(#\{{3} arch-tag:|0\{{3}~cvs)\s+/, "0{{~rcs ") #KEEP ... ENABLE WIDER USE OF REVISION CONTROL
        para.gsub!(/(~\{ )\s+/,'\1')
        para.gsub!(/ \/\//,'<br />')                                           #added 2004w29
        para.gsub!(/<br>/,'<br />')                                            #needed by xml, xhtml etc.
        #para.gsub!(/<p>/,'<p />')                                             #consider
        para.gsub!(/`/,"'")
        para.gsub!(/\342\200\231/,"'") #if para =~/’/  #Avoid #&lsquo; &rsquo; #&ldquo; &rdquo;
        para.gsub!(/\t/,' ')
        para.gsub!(/�/,' ') #watch, replace with char code
        para.gsub!(/[“”]/,'""')
        para.gsub!(/[­–—]/,'-')   #— – chk
        para.gsub!(/·/,'*')
        para.gsub!(/\\copy(?:right)?\b/,'&#169;')
        para.gsub!(/\\trademark\b|\\tm\b/,'&#174;')
        #non_utf8(para)
        para=para + "\n"
        case para
        when /\^~/ # endnotes
                                                                               #% Note must do this first (earlier loop) and then enter gathered data into ~^\d+
          sub_para=para.dup
          @@endnote_array << sub_para.gsub!(/\n/,'').gsub!(/\^~\s+(.+)\s*/, %{~\{#{endnote_no} \\1 \}~}).strip
           endnote_no+=1
          para=nil if para =~/\^~ .+/ #removes 'binary' endnote now in endnote array for later insertion
        end
        @tuned_file << para unless para.nil?
      end
      @tuned_file=@tuned_file.flatten
    end
    def images(data)
      tuned_file=[]
      @rmgk=false
      if SiSU_Env::Info_settings.new.program?('rmagick'); @rmgk=SiSU_Env::Load.new('RMagick').prog
      else tell=SiSU_Screen::Ansi.new(@md.cmd,'use of RMagick is not enabled in sisurc.yml')
        tell.warn if @md.cmd =~/[vVM]/
      end
      data.each do |para|
        para.strip!
        if para =~/\{\s*\S+\.(?:png|jpg|gif)(?:\s*|\s+.+)?\}(?:(?:https?|ftp):\S+|image)/
          if para !~/\{\s*\S+\.(?:png|jpg|gif)\s+\d+x\d+\s+/
            m=/\{\s*(\S+\.(?:png|jpg|gif))/
            if @rmgk
              imgs=para.scan(m).flatten
              images=imgs.each do |image|
                dir=SiSU_Env::Info_env.new(@md.fns)
                path_image=[dir.path.image_source_local_tex,dir.path.image_source_remote_tex,dir.path.image_source_tex]
                image_path=nil
                path_image.each do |image_path|
                  break if FileTest.exist?("#{image_path}/#{image}")
                end
                if FileTest.exist?("#{image_path}/#{image}")
                  img=Magick::ImageList.new("#{image_path}/#{image}")
                  img_col,img_row=img.columns,img.rows
                  if img_col > img_row                                               #landscape
                    if img_col> 640 #480
                      img_col=640 #480
                      img_row=((1.00*img_col/img.columns)*img.rows).round
                    end
                  else                                                               #portrait
                    if img_col> 640 #480
                      img_col=640 #480
                      img_row=((1.00*img_col/img.columns)*img.rows).round
                    end
                    if img_row > 640
                      img_row=640
                      img_col=((1.00*img_row/img.rows)*img.columns).round
                    end
                  end
                  para.gsub!(/(#{image})/,"#{image} #{img_col}x#{img_row}")
                else para.gsub!(/\{\s*(\S+)\.(png|jpg|gif).+?\}((?:https?|ftp):\S+|image)/,'[ \1 (\2 missing) ]')
                end
              end
            else
              images=para.scan(m) do |image|
                tell=SiSU_Screen::Ansi.new(@md.cmd,'where image dimensions have not been provided RMagick is required',image)
                tell.warn #unless @opt.cmd =~/q/
              end
            end
          end
        end
        para.gsub!(/\{\s+(\S+\.(?:png|jpg|gif))\s+/i,'{\1 ') if para =~/\{\s+\S+\.(?:png|jpg|gif).+?\}(?:(?:https?|ftp):\S+|image)/
        tuned_file << para unless para.nil?
      end
      tuned_file
    end
    def output_filetypes_in_cmd(cmd_shortcut,source=nil)
      #make list of file types in shortcut command (as configured), e.g. when sisu -3 is used
      cf_defaults=SiSU_Env::Info_processing_flag.new
      cmd_list=case cmd_shortcut.to_s
      when /0/; cf_defaults.cf_0
      when /1/; cf_defaults.cf_1
      when /2/; cf_defaults.cf_2
      when /3/; cf_defaults.cf_3
      when /4/; cf_defaults.cf_4
      when /5/; cf_defaults.cf_5
      end
      file_type_names=[]
      file_type_names <<= if cmd_list =~ /y/; 'sisu_manifest.html'
      end
      file_type_names <<= if cmd_list =~ /h/; ['toc.html', 'doc.html']
      end
      file_type_names <<= if cmd_list =~ /p/; ['landscape.pdf', 'portrait.pdf']
      end
      file_type_names <<= if cmd_list =~ /o/; 'opendocument.odt'
      end
      file_type_names <<= if cmd_list =~ /b/; 'scroll.xhtml'
      end
      file_type_names <<= if cmd_list =~ /x/; 'sax.xml'
      end
      file_type_names <<= if cmd_list =~ /X/; 'dom.xml'
      end
      file_type_names <<= if cmd_list =~ /a/; 'plain.txt'
      end
      file_type_names <<= if cmd_list =~ /g/; 'wiki.txt'
      end
      file_type_names <<= if cmd_list =~ /w/; 'concordance.html'
      end
      file_type_names <<= if cmd_list =~ /N/; 'digest.txt'
      end
      file_type_names <<= if source and cmd_shortcut =~ /s/; source
      end
      file_type_names <<= if cmd_shortcut =~ /S/; 'sisupod.zip'
      end
      file_type_names=file_type_names.flatten
    end
    def substitutions_and_insertions?(data)
      tuned_file=[]
      if data[0] =~ /^#!\s*(?:\/usr\/bin\/env sisu|\/usr\/bin\/sisu)/ # remove bang from top #! (however file is stripped, so will be removed provided no content preceeds it)
        data[0].gsub!(/^#!\s*\/usr\/bin\/sisu/,'')
        data[0].gsub!(/^#!\s*\/usr\/bin\/env sisu/,'')
      end
      if data[0] =~ /^(SiSU\s+[\d.]*|sisu-[\d.]+)$/ # SiSU identifier
        data[0].gsub!(/^(SiSU\s*[\d.]*)$/,'% \1')
        data[0].gsub!(/^(sisu-[\d.]+)$/,'% \1')
      end
      data.each do |para|
        para=if @md.markup_version.to_f >= 0.38
          SiSU_document_structure::Structure.new(@md,para).structure_markup_normalize
        else para
        end
        #para.gsub!(/<url:(\S+?)>/,'\1') #consider, would permit use of text hyperlinks if desired, dal_syntax more appropriate?
        para.gsub!(/^((?:[1-9]|:?[A-C])~\S*)\s*$/,'\1~ [Note: heading marker::required title missing]~#')                                    #conditional header for incorporated document 2004w12
        if para =~/^@\S+?:/
          para.gsub!(/^@(\S+?):\s+/,'0~\1 ')
          para.gsub!(/^@(\S+?):([+-])\s+/,'0~\1\2 ')
        end
        if para !~/^%+\s/ and
           para =~/^(?:_\*\s+)?\{(?:~\^\s+)?(.+?)\s\[(?:\d(?:[sS]+))\]\}(?:\.\.\/\S+?\/|\S+?\.(?:sst|ssm)\b)(?:\s+~\{.+?\}~)?(?:\s+\*~\S+)*\s*$/
          txt,cmd,source,url_dir,note,manifest=nil,nil,nil,nil,nil,nil
          url_and_stub=SiSU_Env::Info_env.new.url
          if defined? url_and_stub.remote
            @output_url="#{url_and_stub.remote}"
            if para =~/\{(.+?)\s\[(\d[sS]*)\]\}((\S+?)\.ss[tm])(\s+~\{.+?\}~)?/
              #syntax e.g.: { "Sphinx or Robot", Leena Krohn [3sS]}sphinx_or_robot.leena_krohn.1996.sst
              txt,cmd,source,url_dir,note=$1,$2,$3,$4,$5
            elsif para =~/\{(.+?)\s\[(\d[sS]*)\]\}\.\.\/(\S+?)\/(\s+~\{.+?\}~)?/
              #syntax e.g.: { "Sphinx or Robot", Leena Krohn [3sS]}../sphinx_or_robot.leena_krohn.1996/
              txt,cmd,url_dir,note=$1,$2,$3,$4
            end
            manifest="{#{txt} }#@output_url/#{url_dir}/toc.html#{note}\n\n"
          else
            puts "error, does currently support relative paths (reltive paths were removed, as had problems for citation, and was not suited to all output types should possibly reconsider) #{__FILE__} #{__LINE__}"
            if para =~/\{(?:~\^\s+)?(.+?)\s\[(\d[sS]*)\]\}\.\.\/(\S+?)\/(\s+~\{.+?\}~)?/
              txt,cmd,url_dir,note=$1,$2,$3,$4
              manifest="{ #{txt} }../#{url_dir}/toc.html#{note}\n\n"
            end
          end
          tuned_file << manifest
          output_filetypes_in_cmd(cmd,source).each do |o_f|
            describe = case o_f
            when /sisu_manifest.html/; '~^ document manifest'
            when /toc.html/;           ' html, segmented text'
            when /doc.html/;           ' html, scroll, document in one'
            when /landscape.pdf/;      ' pdf, landscape'
            when /portrait.pdf/;       ' pdf, portrait'
            when /opendocument.odt/;   ' open document'
            when /scroll.xhtml/;       ' xhtml scroll'
            when /sax.xml/;            ' xml, sax'
            when /dom.xml/;            ' xml, dom'
            when /plain.txt/;          ' plain text utf-8'
            when /wiki.txt/;           ' wiki text'
            when /concordance.html/;   ' concordance'
            when /digest.txt/;         ' dcc, document content certificate (digests)'
            when /#{source}/;          ' markup source text'
            when /sisupod.zip/;        ' zipped markup source pod'
            else nil
            end
            if describe
              if @output_url
                tuned_file << "_1 {#{describe} }#@output_url/#{url_dir}/#{o_f}\n\n" if describe
              else
                tuned_file << "_1 { #{describe} }../#{url_dir}/#{o_f}\n\n"
              end
            end
          end
        elsif para =~/<:insert\d+!?>/ and para !~/^%\s+/
          @skin.select
          ins=SiSU_Viz::Inserts.new
          case para
          when /^\s*<:insert1>\s*$/
            para=[]
            ins.insert1.split(/\n\n/).each{|x| para << x }
          when /^\s*<:insert2>\s*$/
            para=[]
            ins.insert2.split(/\n\n/).each{|x| para << x }
          when /^\s*<:insert3>\s*$/
            para=[]
            ins.insert3.split(/\n\n/).each{|x| para << x << "\n"}
            para=ins.insert3
          when /^\s*<:insert4>\s*$/
            para=[]
            ins.insert4.split(/\n\n/).each{|x| para << x << "\n"}
            para=ins.insert4
          when /^\s*<:insert5>\s*$/
            para=[]
            ins.insert5.split(/\n\n/).each{|x| para << x << "\n"}
          when /^\s*<:insert6>\s*$/
            para=[]
            ins.insert6.split(/\n\n/).each{|x| para << x << "\n"}
          when /^\s*<:insert7>\s*$/
            para=[]
            ins.insert7.split(/\n\n/).each{|x| para << x << "\n"}
          end
          para.each{|x| tuned_file << x }
        else tuned_file << para
        end
        tuned_file.flatten!
        tuned_file.compact!
      end
      tuned_file
    end
    def numbering_song(data)
      data=number_plaintext_para(data)
      data=name_endnote_seg(data) #tr issue
      data=auto_number_heading_ie_title(data) #tr issue
      data=ocn(data) unless @md.markup =~/not_to/
      data=minor_numbering(data) #unless @md.markup =~/not_to/
      data=name_para_seg_filename(data)
      data=set_heading_seg(data) unless @md.set_heading_seg
      data=set_heading_top(data) unless @md.set_heading_top
      data=set_header_title(data) unless @md.set_header_title
      data
    end
    def number_plaintext_para(data)
      @tuned_file=[]
      data.each do |para|
        para.gsub!(/(^|[^<][^v][^>])\n/,'\1 ') #messy, but idea is that tables should retain breaks
        para.gsub!(/^/,"\n") unless para =~/¡/
        para.gsub!(/^\s+|\s$/,"\n")
        @tuned_file << para
      end
      @tuned_file=@tuned_file.flatten
    end
    def name_endnote_seg(data)
      @tuned_file=[]
      data.each do |para|
        para.gsub!(/<:3>\s*<:ee>/, <<-WOK
#{@@endnote['special_align']} <p /><br />\r
#{@@endnote['seg_name_3']} <p />
#{@@endnote['special_align_close']}
        WOK
        )
        para.gsub!(/<:2>\s*<:ee>/, <<-WOK
#{@@endnote['special_align']} <p /><br />\r
#{@@endnote['seg_name_2']} <p />
#{@@endnote['special_align_close']}
        WOK
        )
        para.gsub!(/<:1>\s*<:ee>/, <<-WOK
#{@@endnote['special_align']} <p /><br />\r
#{@@endnote['seg_name_1']} <p />
#{@@endnote['special_align_close']}
        WOK
        )
        @tuned_file << para
      end
      # debug 2003w46 adding revision control info
      if @md.flag_auto_endnotes and @md.flag_separate_endnotes_make
        @tuned_file << "\n4~endnotes Endnotes <~0;0:0;u0>" #prob numbering, revisit
      end
      @tuned_file << "\n<ENDNOTES>"
      @tuned_file=@tuned_file.flatten
    end
    def owner_details_seg
      data << '4~owner.details Owner Details'
    end
    def number_sub_heading(para,num,title_no)
      case para
      when /#{num}~- /;    para.gsub!(/#{num}~- /,"#{title_no} ")
      when /^#{num}~#\s*/; para.gsub!(/^#{num}~#\s*/,"#{title_no} ")
      when /^#{num}~[a-z_\.]+ /
        para.gsub!(/^#{num}~([a-z_\.]+)\s+(.+)/i,%{#{num}~\\1 #{title_no} \\2  <:name##{title_no}>})
      else para.gsub!(/^#{num}~ /,"#{num}~#{title_no} #{title_no} ") #main
      end
      if @md.toc_lev_limit and @md.toc_lev_limit < num
        para.gsub!(/^[5-8]~(?:~\S+)?\s*/,'!_ ')
      end
      para
    end
    def auto_number_heading_ie_title(data)                                             #also does some segment naming
      @tuned_file=[]
      if @md.markup =~/num_top/ or @md.num_top # watch, 2003w23
        input="#{@md.markup}"[/num_top\=([1-6])/,1] if @md.markup
        input||=@md.num_top if @md.num_top !~/^$/
      end
      num_top=input.to_i
      t_no1=t_no2=t_no3=t_no4=0
      no1=num_top; no2=(num_top + 1); no3=(num_top + 2);  no4=(num_top + 3)
      t_not=0
      data.each do |para| #@md.seg_names << [additions to segment names]
        if (@md.markup =~/num_top/ or (@md.num_top and @md.num_top !~/^$/)) and para !~/^0~/
          if (para =~/^(?:#{no1}|^#{no2}|^#{no3}#{no4})~#/ and para !~/^4~endnotes?/)
            t_not+=1 #; t_no2=0; t_no3=0
            para.gsub!(/^(#{no1})~#\s*/,"\\1~ps#{t_not} ")
            para.gsub!(/^(#{no2})~#\s*/,"\\1~ps#{t_not} ")
            para.gsub!(/^(#{no3})~#\s*/,"\\1~ps#{t_not} ")
            para.gsub!(/^(#{no4})~#\s*/,"\\1~ps#{t_not} ")
          end
          if para =~/#{no1}~/
            @subnumber=1
            @subnumber=0 if para =~/#{no1}~/
          end
          if para =~/^[0-6]~[ \w-]/ and para !~ /(?:[0-6]~[\w-]+-|4~endnotes|^[0-6]~([a-z_\.]+)\s+[\d.]+)\s/ and para !~/<~#>|<-#>/
            if para =~/^#{no1}~/
              t_no1+=1; t_no2=0; t_no3=0
              title_no="#{t_no1}"
              if not @md.seg_names.nil? and not @md.seg_names.include?(title_no)
                para.gsub!(/^#{no1}~\s+(\S+)#/,"#{no1}~#{title_no} \\1 #{title_no} ") #shift placement of auto-number to after first word, e.g. Article # not # Article, added on occasion of ABF (20040329)
                para.gsub!(/^#{no1}\{\s+(Article|Clause|Section)\s+#/i,%{#{no1}~#{title_no} \\1 #{title_no}. })
                unless para =~/^#{no1}~\s+[\d.]+\s/ #fix -> if the title starts with a numbering scheme, do not auto-number, review
                  para.gsub!(/^#{no1}~\s+/,"#{no1}~#{title_no} #{title_no}. ")
                end
                @md.seg_names << title_no
              #else puts "warning segment name #{title_no} already exists"
              end
              unless para =~/^#{no1}~([a-z_\.]+)\s+[A-Z]\.?\s/ #bug -> tmp fix, excludes A. B. C. lettering, but not roman numerals, is arbitrary, review required
                para.gsub!(/^#{no1}~([a-z_\.]+)\s+(.+)/i,%{#{no1}~\\1 #{title_no}. \\2 <:name##{title_no}>})
              end
              para.gsub!(/^#{no1}~#\s*/,"#{title_no}. ")
            end
            if para =~/^#{no2}~/
              t_no2+=1; t_no3=0
              title_no="#{t_no1}.#{t_no2}"
              para=number_sub_heading(para,no2,title_no)
            end
            if para =~/^#{no3}~/
              t_no3+=1
              title_no="#{t_no1}.#{t_no2}.#{t_no3}"
              para=number_sub_heading(para,no3,title_no)
            end
          elsif para =~ /^[0-6]~[\w-]+-/ # endnotes, watch2005
            para.gsub!(/^#{no1}~([a-z_\.]+)- /,"#{no1}~\\1 ")
            para.gsub!(/^#{no2}~([a-z_\.]+)- /,"#{no2}~\\1 ")
            para.gsub!(/^#{no3}~([a-z_\.]+)- /,"#{no3}~\\1 ")
          end
        elsif @md.markup =~/num_extract/ #AS DANGEROUS force enable with document, note already does this type of numbering for cisg, locate and coordinate logic, is currently misplaced in code, chengwei inspired 2004w23/4
          unless para =~ /^[0-6]~\S+/ #endnotes watch?
            if para =~/^[1-6]~\s+([\d\.]+)/ #risky (must be unique) consider output to 4~~\d instead of 4~\d
              name_num=$1
              para.gsub!(/^([1-6]~)\s+/,"\\1#{name_num} ")
            end
          end
          if @md.toc_lev_limit
          end
        end
        @tuned_file << para
      end
      @tuned_file=@tuned_file.flatten
    end
    def ocn(data)                                                                      #and auto segment numbering increment
      @tuned_file=[]
      object_array=SiSU_document_structure::OCN.new(@md,data).ocn
      object_array.each do |o|
        @tuned_file <<= if o.ocn; "#{o.txt} <~#{o.ocn};#{o.lv};#{o.type}>"
        else o.txt
        end
      end
      @tuned_file=@tuned_file.flatten
    end
    def minor_numbering(data)                                                          #and auto segment numbering increment
      @tuned_file=[]
      number_small,letter_small=0,0
      letter=%w( a b c d e f g h i j k l m n o p q r s t u v w x y z )
      data.each do |para|
        if para =~/\w|\S|<|\(/
          if para !~/^%% |^0~|^4~endnotes|^<\/center>|<:ee>|<:e[:_]>|^\^~ |<:e[:_]\d+?>|^<:p[bn]>|^<:\#|<:- |<[:!]!4|^(?:alt|code|group|poem|table)\{|^\}(?:alt|code|group|poem|table)|^\}table$|<table|<\/table>|<td|<\/td>|<th|<\/th>|<tr>|<\/tr>|<hr width|<:4-endnotes>|\[endnotes\]|<:zz>|<:isbn-|<:journal-|<:conference-|<ENDNOTES?>/i #ocn here #&nbsp; added with Tune.code #¡
            if para=~/^[1-8]~/; number_small,letter_small=0,0                    #% sub-number system, (baby numbering) reset with any change of major number (more obviously should be placed in number titles, but that is conditionally executed, check and move later)
            end
            if para =~/^#[ 1]/
              letter_small=0
              number_small=0 if para =~ /^#1/
              number_small+=1
              para.gsub!(/^#[ 1]/,"#{number_small}. ") #change 2004
            end
            if para =~/^_# /
              para.gsub!(/^_# /,"<:i1> #{letter[letter_small]}. ") #change 2004
              letter_small+=1
            end
          end
        end
        @tuned_file << para
      end
      @tuned_file=@tuned_file.flatten
    end
    def name_para_seg_filename(data)
      # paragraph name/numbering rules
      # manual naming overrides, manual naming may be
      #   alpha-numeric characters mixed,
      #   numeric only (a number), if
      #     all segments have been named,
      #     the numbers used are over 1000 or
      #     it is  not minded that auto-numbering uses a funny scheme for naming segments (not yet implemented)
      #       [for now a warning is printed for such documents on use of maintenance or very-verbose flag]
      # auto-naming takes the form of giving numbers to segments
      # the rules for which are as follows
      #   if the title/heading text starts with a numeric, then that is used (1 3.1 3rd etc.)
      #   otherwise the level 4 segment number from the embedded document structure info is used
      #   if there is none a sequential number is designated, preceded by an underscore
      @tuned_file=[]
      art_filename_auto=1
      @counter=1
      @unique_auto_name=[]
      puts 'manual segment names, numbers used as names, risk warning (segmented html)' if not @md.seg_autoname_safe and @md.cmd =~/[MV]/
      data.each do |para|
        para=SiSU_document_structure::Structure.new(@md,para).structure_markup
        if para !~/^0~/
          if para =~/^[456]~ /
            if para=~/^4/ and not @md.set_heading_seg
              @md.set_heading_seg=true
            end
            if para =~/^[456]~(?:\s\S+)?\s+([\d.,:-]+)/m #heading starts with a recognised numeric or word followed by a recognised numerical construct, use that as name
              pattern=$1
              pattern.gsub!(/(?:[:,-]|\W)/,'.')
              pattern.gsub!(/\.$/,'')
              if not @md.seg_names.nil? and not @md.seg_names.include?(pattern)
                para.gsub!(/^([456])~\s*/,"\\1~#{pattern} ")
                @md.seg_names << pattern
              else puts 'warn, there may be a conflicting numbering scheme' if @md.cmd =~/[VM]/
              end
            end
            if para =~/^4~\s.+?;4:(\d+);/m #extract segment name from embedded document structure info
              pattern=$1
              pattern.gsub!(/(?:[:,-]|\W)/,'.')
              pattern.gsub!(/\.$/,'')
              if not @md.seg_names.nil? and not @md.seg_names.include?(pattern)
                para.gsub!(/^(4)~\s*/,"\\1~#{pattern} ")
                @md.seg_names << pattern
              else
                para.gsub!(/^(4)~\s*/,"\\1~~#{pattern} ")
                @md.seg_names << "~#{pattern}"
              end
            end
            if para =~/^4~\s+/ #if still not segment name, provide a numerical one
              if not @md.seg_names.nil? and not @md.seg_names.include?(art_filename_auto)
                para.gsub!(/^4~\s+/,%{4~_#{art_filename_auto} })
                @md.seg_names << art_filename_auto
              else puts 'segment name (numbering) error'
              end
              art_filename_auto+=1
            end
          end
        end
        @tuned_file << if para =~/^([1-6])~/m and (@md.pagenew or @md.pagebreak); m=$1 #watch ref~
          para_tmp=[]
          if @md.pagenew.to_s =~/#{m}/;           para_tmp << "<:pn>\n" << para
          end
          if @md.pagebreak.to_s =~/#{m}/;         para_tmp << "<:pb>\n" << para
          end
          para_result=unless para_tmp.length > 0; para
          else                       para_tmp
          end
        else                         para
        end
      end
      if @md.seg_names.length > 0
        @md.set_heading_seg=true
      end
      @tuned_file=@tuned_file.flatten
    end
    def set_heading_top(data)                                                         #% make sure no false positives
      unless @md.set_heading_top
        puts "\tdocument contains no top level heading, (will have to manufacture one)" if @md.cmd =~/[MV]/
        @tuned_file=[]
        data.each do |para|
          unless @md.set_heading_top
            if para !~/^(?:@\S+:|0~\S+)\s/m and para !~/\A\s*\Z/m
              @md.set_heading_top=true
              head=if @md.title ; "1~ #{@md.title}"
              else                '1~ [no title provided]'
              end
              @tuned_file << head
            end
          end
          @tuned_file << para
        end
        @tuned_file=@tuned_file.flatten
      end
    end
    def set_heading_seg(data)                                                          #% make sure no false positives
      unless @md.set_heading_seg
        puts "\tdocument contains no segment level, (will have to manufacture one)" if @md.cmd =~/[MV]/
        @tuned_file=[]
        data.each do |para|
          unless @md.set_heading_seg
            if para !~/^(?:@\S+:|0~\S+|[123]~)/m and para !~/\A\s*\Z/m and para !~/<:p[bn]>/
              @md.set_heading_seg=true
              head=if @md.title ; "4~seg [#{@md.title}]"
              else                '4~seg [segment]'
              end
              @tuned_file << head
            end
          end
          @tuned_file << para
        end
        @tuned_file=@tuned_file.flatten
      end
    end
    def set_header_title(data)                                                         #% make sure no false positives
      unless @md.set_header_title
        puts "\t no document title provided, (will have to manufacture one)" if @md.cmd =~/[MV]/
        @tuned_file=[]
        data.each do |para|
          unless @md.set_header_title
            if para !~/^%{1,2}\s/m and para !~/\A\s*\Z/m
              @tuned_file << "0~title #{@md.heading_seg_first}"
              @md.title=@md.heading_seg_first
              @md.set_header_title=true
            end
          end
          @tuned_file << para
        end
        @tuned_file=@tuned_file.flatten
      end
    end
    def endnotes(data)
      @tuned_file=[]
      endnote_no,endnote_ref=1,1
                                                                                 #% endnote work zone
      data.each do |para|
                                                                                 # manually numbered endnotes <!e(\d)!> <!e_(\d)!> -->
        if @md.mod.inspect =~/--no-asterisk|--no-annotate/
          para.gsub!(/~\[[*]\s.+?\]~/,'')
        end
        if @md.mod.inspect =~/--no-dagger|--no-annotate/
          para.gsub!(/~\[[+]\s.+?\]~/,'')
        end
        case para
                                                                               # auto-numbered endnotes <!e!> <!e_!> -->
        when /~\{\s+.+?\}~|~\[[*+]\s+.+?\]~/
          para.gsub!(/\s*(\}~|\]~)/,' \1')                                     # required 2003w31
          word_mode=para.scan(/\S+/)
          word_mode=endnote_call_number(word_mode)
          para=word_mode.join(' ')
          endnote_ref+=1
        when /~\^(?:\s|$)|<:e>/
                                                                               #%Note inserts endnotes previously gathered from /^(<!e[:_]!>|[-~]\{{3})/ (in earlier loop)
          word_mode=para.scan(/\S+/)
          word_mode=endnote_call_number(word_mode)
          para=word_mode.join(' ')
          endnote_ref+=1
        end
        @tuned_file << para
      end
      @tuned_file=@tuned_file.flatten
    end
    def endnote_call_number(data)
      data.each do |word|
        case word
        when /~\{/
          unless word =~/~\{[*+]+/
            word.gsub!(/~\{/,"~\{#{@@endnote_counter} ")
            @@endnote_counter+=1
          end
        when /~\[/
          if word =~/~\[[+]/
            word.gsub!(/~\[[+]/,"~\[\+#{@@endnote_counter_dag} ")
            @@endnote_counter_dag+=1
          else
            word.gsub!(/~\[[*]?/,"~\[\*#{@@endnote_counter_asterisk} ")
            @@endnote_counter_asterisk+=1
          end
        when /~\^|<:e>/
          word.gsub!(/~\^|<:e>/,"#{@@endnote_array[@@endnote_counter-1]}")
          @@endnote_counter+=1
        end
      end
    end
    def metadata(data)
      meta,@dc,@rc,@cvs,dctitle,add=Array.new(6){[]}
      dir=SiSU_Env::Info_env.new(@md.fns)
      base_html="#{dir.url.root}/#{@md.fnb}"
      ocnm=ocnd=ocnv=0
      ocnm+=1
      header0='<:pn>'
      header1="\n1~ Document Information <~0;0:0;m#{ocnm}>"
      ocnm+=1
      header4="\n4~metadata MetaData <~0;m#{ocnm};m#{ocnm}>"
      ocnm+=1; ocnd+=1
      head_no_dc="<~0;m#{ocnm};d#{ocnd}>"
      ocnm+=1; ocnd+=1
      head_no_dc_tag="<~0;m#{ocnm};d#{ocnd}>"
      data.each do |para|
        case para
        when /^0~(title|creator|author|translator|translated_by|illustrator|illustrated_by|prepared_by|digitized_by|description|publisher|contributor|date\.created|date\.issued|date\.available|date\.valid|date\.modified|date|type|format|rights|identifier|source|language)/i
          m=$1
          ocnm+=1; ocnd+=1
          @dc << case para
          when /^0~title/
            "\n#{@tr.dc_title}: <u>#{@md.dc_title}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~(?:creator|author)/
            "\n#{@tr.creator}: <u>#{@md.dc_creator}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /0~(?:translator|translated_by)/
            "\n#{@tr.translator}: <u>#{@md.translator}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~(?:illustrator|illustrated_by)/
            "\n#{@tr.illustrator}: <u>#{@md.illustrator}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~prepared_by/
            "\n#{@tr.prepared_by}: <u>#{@md.prepared_by}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~digitized_by/
            "\n#{@tr.digitized_by}: <u>#{@md.digitized_by}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~description/
            "\n#{@tr.description}: <u>#{@md.dc_description}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~subject/
            "\n#{@tr.subject}: <u>#{@md.dc_subject}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~abstract/
            "\n#{@tr.abstract}: <u>#{@md.dc_abstract}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~publisher/
            "\n#{@tr.publisher}: <u>#{@md.dc_publisher}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~contributor/
            "\n#{@tr.contributor}: <u>#{@md.dc_contributor}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date.created/
            "\n#{@tr.date_created}: <u>#{@md.dc_date_created}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date.issued/
            "\n#{@tr.date_issued}: <u>#{@md.dc_date_issued}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date.available/
            "\n#{@tr.date_available}: <u>#{@md.dc_date_available}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date.modified/
            "\n#{@tr.date_modified}: <u>#{@md.dc_date_modified}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date.valid/
            "\n#{@tr.date_valid}: <u>#{@md.dc_date_valid}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~date/
            "\n#{@tr.date}: <u>#{@md.dc_date}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~type/
            "\n#{@tr.type}: <u>#{@md.dc_type}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~format/
            "\n#{@tr.format}: <u>#{@md.dc_format}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~rights/
            "\n#{@tr.rights}: <u>#{@md.dc_rights}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~identifier/
            "\n#{@tr.identifier}: <u>#{@md.dc_identifier}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~source/
            "\n#{@tr.source}: <u>#{@md.dc_source}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~language/
            "\n#{@tr.language}: <u>#{@md.dc_language}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~language.original/
            "\n#{@tr.language_original}: <u>#{@md.language_original}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~relation/
            "\n#{@tr.relation}: <u>#{@md.dc_relation}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~coverage/
            "\n#{@tr.coverage}: <u>#{@md.dc_coverage}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~keywords/
            "\n#{@tr.keywords}: <u>#{@md.keywords}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~comments/
            "\n#{@tr.comments}: <u>#{@md.comments}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~cls_loc/
            "\n#{@cls_dewey}: <u>#{@md.cls_dewey}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~cls_dewey/
            "\n#{@tr.cls_dewey}: <u>#{@md.cls_dewey}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~cls_gutenberg|0~cls_pg/
            "\n#{@tr.cls_gutenberg}: <u>#{@md.cls_gutenberg}</u> <~0;m#{ocnm};d#{ocnd}>"
            #"\n#{@tr.cls_gutenberg}: <u>#{@md.cls_pg}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~cls_isbn/
            "\n#{@tr.cls_isbn}: <u>#{@md.cls_isbn}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~prefix(?:_a)?/
            "\n#{@tr.prefix_a}: <u>#{@md.prefix_a}</u> <~0;m#{ocnm};d#{ocnd}>"
          when /^0~prefix_b/
            "\n#{@tr.prefix_b}: <u>#{@md.prefix_b}</u> <~0;m#{ocnm};d#{ocnd}>"
          else para.gsub(/^0~(#{m})\s+(.+)/m,"\n#{m.capitalize}: <u>\\2</u> <~0;m#{ocnm};d#{ocnd}>")
          end
        end
      end
      ocnm+=1; ocnv+=1
      head_no_rc="<~0;m#{ocnm};v#{ocnv}>"
      ocnm+=1; ocnv+=1
      head_no_rc_tag="<~0;m#{ocnm};v#{ocnv}>"
      data.each do |para|
        case para
        when /^0~(?:cvs|rcs)\+\s+/ #note the + sign to turn on use of cvs id
          ocnm+=1; ocnv+=1
          @cvs << "#{@tr.sc_number}: <u>#{@md.sc_number}</u> <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
          @cvs << "#{@tr.sc_date}: <u>#{@md.sc_date}</u> <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
          @cvs << "CVS/RCS time: <u>#{@md.sc_time}</u> <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
        when /^0~cvs[+\s]/ #enable pattern above instead if you wish the default to be to include cvs tags from all documents KEEP
        when /^0~cvs\s+/ #enable pattern above instead if you wish the default to be to include cvs tags from all documents KEEP
        end
      end
      if true #default version information
        ocnm+=1; ocnv+=1
        if @md.sc_filename and @md.sc_filename.length > 3
          @rc << "#{@tr.sourcefile}: <u>#{@md.sc_filename}</u> <~0;m#{ocnm};v#{ocnv}>"
        else @rc << "#{@tr.sourcefile}: <u>#{@md.fns}</u> <~0;m#{ocnm};v#{ocnv}>"
        end
        ocnm+=1; ocnv+=1
        if @md.file_encoding and @md.file_encoding.length > 3  #translate
          @rc << "Filetype: <u>#{@md.file_encoding}</u> <~0;m#{ocnm};v#{ocnv}>"
        end
        ocnm+=1; ocnv+=1
        if @md.dgst #change. enable by default
          @rc << "#{@tr.sourcefile_digest}, #{@md.dgst[0]} <u>#{@md.dgst[1]}</u> <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
        end
        if @md.dgst_skin #change. enable by default
          @rc << "Skin_Digest: #{@md.dgst_skin[0]} <u>#{@md.dgst_skin[1]}</u> <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
        end
        @rc << "<b>Generated</b> #{head_no_rc}" if @rc.length > 0
        @rc << "#{@tr.last_generated}: <u>#{Time.now}</u> <~0;m#{ocnm};v#{ocnv}>"
        ocnm+=1; ocnv+=1
        if @md.sisu_version[:version]
          @rc << "#{@tr.sisu_version}: <u>#{@md.sisu_version[:project]}</u>  <u>#{@md.sisu_version[:version]}</u> of #{@md.sisu_version[:date_stamp]} (#{@md.sisu_version[:date]}) <~0;m#{ocnm};v#{ocnv}>"
          ocnm+=1; ocnv+=1
        end
        @rc << "#{@tr.ruby_version}: <u> #{@md.ruby_version}</u> <~0;m#{ocnm};v#{ocnv}>"
      end
      meta << header0
      meta << header1
      meta << header4
      meta << "Document Manifest @\n #{base_html}/#{@md.fn[:manifest]} <~0;m#{ocnm};m#{ocnm}>"
      meta << "<b>Dublin Core</b> (DC) #{head_no_dc}" if @dc.length > 0
      meta << "<i>DC tags included with this document are provided here.</i> #{head_no_dc_tag}" if @dc.length > 0
      @dc.each { |x| meta << x }
      meta << "<b>Version Information</b> #{head_no_rc}" if @rc.length > 0
      if @cvs.length > 0
        meta << "<i>Note the version information provided here, is specific to the host site.</i> #{head_no_rc_tag}"
        @cvs.each { |x| meta << x }
      end
      @rc.each { |x| meta << x }
      ## ENDNOTE RELATED endnote related
      meta << "\n<EOF>"
      meta=object_digest(meta)
    end
    def stamped(para,hash_class)
      @tuned=[]
      para=strip_clean_extra_spaces(para)
      digest_all=hash_class.hexdigest(para) # print "#{hash_class.name}: "; puts digest_all #length==32 or 64
      stripped=strip_clean_of_markup(para)
      digest_strip=hash_class.hexdigest(stripped)
      case para
      when /~\{[\d*+]+\s+.+?\}~|~\[[*+]\d+\s+.+?\]~/
        en_and_para,en_and_para_digest=[],[]
        para.gsub!(/\s*(\}~|\]~)/,' \1') #watch
        para_plus_en=para.scan(/.*?~\{.+?\}~|.*?~\[.+?\]~/)
        para_tail=if para =~/(?:.*?~\{.+?\}~|.*?~\[.+?\]~)+([\s\S]+)/
          /(?:.*?~\{.+?\}~|.*?~\[.+?\]~)+(.+?<~\d+;(?:\w|[0-6]:)\d+;\w\d+>)/.match(para)[1]
        else ''
        end
        para_plus_en << para_tail
        en_and_para_digest << endnote_digest(para_plus_en)
        para_new=en_and_para_digest.join(' ')
        @tuned << para_new + '<' + digest_strip + ':' + digest_all + '>' unless para.nil?
      else @tuned << para + '<' + digest_strip + ':' + digest_all + '>' unless para.nil?
      end
      @tuned.join
    end
    def object_digest(data)
    # 1. clean/stripped text without any markup, paragraph, headings etc. without endnotes
    # 2. endnotes clean/stripped text digest only (there may be several endnotes within a paragraph)
    # 3. whole object, text with markup and any endnotes, (question: with or without the endnote digests??? presumption better without, [however may be easier to check with?])
    # [digests should not include other digests]
    # vim==/<[0-9a-f]\{#{@@dl}\}\(:[0-9a-f]\{#{@@dl}\}\)\?>/
      require 'digest/md5'
      require 'digest/sha2'
      @tuned_file=[]
      data.compact!
      data.each do |para|
        para.strip!
        if para=~/<~\d+;(?:\w|[0-6]:)\d+;\w\d+>/
          if @env.digest.type =~/sha256/
            for hash_class in [ Digest::SHA256 ]
              @tuned_file << stamped(para,hash_class)
            end
          else
            for hash_class in [ Digest::MD5 ]
              @tuned_file << stamped(para,hash_class)
            end
          end
        else @tuned_file << para unless para.nil?
        end
      end
      @tuned_file=@tuned_file.flatten
      #use md5 or to create hash of each dal object including ocn, & add into to each dal object
    end
    def endnote_digest(data)
      para_bit=[]
      data.each do |en_plus|
        para_bit <<= case en_plus
        when /~\{|~\[/
          if en_plus =~/~\{.+?\}~|~\[.+?\]~/
            para_txt,en_open,en_txt,en_close=/(.*?)(~\{|~\[)(.+?)(\}~|\]~)/m.match(en_plus)[1..4]
            stripped_en=strip_clean_of_markup(en_txt)
            if @env.digest.type =~/sha256/
              digest_en_strip=Digest::SHA256.hexdigest(stripped_en)
            else
              digest_en_strip=Digest::MD5.hexdigest(stripped_en)
            end
            para_txt + en_open + en_txt + '<' + digest_en_strip + '>' + en_close
          else puts "Error Exception - problem encountered with:\n#{en_plus}" #arbitrary exception, tidy up
          end
        else en_plus
        end
      end
      para_bit.join
    end
    def strip_clean_extra_spaces(s)                                              # dal output tuned
      s=s.dup
      s=s.gsub(/[ ]+([,.;:?](?:$|\s))/,'\1')
      s=s.gsub(/ [ ]+/,' ')
      s=s.gsub(/^ [ ]+/,'')
      s=s.gsub(/ [ ]+$/,'')
      s=s.gsub(/(<\/[bi]>')[ ]+(s )/,'\1\2')
    end
    def strip_clean_of_markup(s)                                                 # used for digest, define rules, make same as in db clean
      #consider: <\/?[ib]>|<(?:\/ )?br>|<del>(.+?)<\/del>
      s=s.dup
      s=s.gsub(/(?:<\/?[ib]>|<~\d+;(?:\w|[0-6]:)\d+;\w\d+>|<#@dp:#@dp>|^[1-6]~\S+|~\{\d+\s.+?\}~)/,'') # markup and endnotes removed
                                                                                 #% same as db clean -->
      s=s.gsub(/<del>(.+?)<\/del>/,'DELETED(\1)')                             # deletions
      s=s.gsub(/<sup>(\d+)<\/sup>/,'[\1]')
      s=s.gsub(/(?:&nbsp\\;)+/,' ')
      #s=s.gsub(/<!T[h]?¡.+?!>/,"[TABLE]\n")                                   # tables
      #s=s.gsub(/<!¡¡\d+(.+?)!>/,'\1')                                         # tables
      #s=s.gsub(/¡¡\d+¡/,' ')                                                  # tables
      #s=s.gsub(/¡/,' ')                                                       # tables tidy later
      #s=s.gsub(/<.+?>/,'')
      s=s.gsub(/\{.+?\.(?:png|jpg|gif).+?\}(?:https?|ftp)\\\:\S+ /,' [image] ')             # else image names found in search
      s=s.gsub(/\s\s+/,' ')
      s=s.strip
    end
  end
end
__END__
dal output, rules to simplify parsing
nodes === objects === paragraphs === text blocks separated by \n\n

dal output:
:verse :group and :code have -end
:table is not used