=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: plaintext text generation, stripped plaintext output (unix, linefeed)

 * 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.

 * Notes: tidy -ascii index.xml >> index.tidy

 * Ralph Amissah: ralph@amissah.com
                  ralph.amissah@gmail.com
=end
module SiSU_Plaintext
  require "#{SiSU_lib}/dal"
  require "#{SiSU_lib}/sysenv"
  include SiSU_Env
  include SiSU_Param
  include SiSU_Viz
  require "#{SiSU_lib}/plaintext_format"
  include Format
  require "#{SiSU_lib}/shared_txt"
  pwd=Dir.pwd
  @@alt_id_count,@@alt_id_count,@@tablehead,@@number_of_cols=0,0,0,0
  @@tablefoot=''
  class Source
    def initialize(opt)
      @opt=opt
      if @opt.fns =~/(.+?)\.[_-]?sst$/
        case @opt.cmd
        when /[af]/; @@dostype='unix footnotes'
        when /e/;    @@dostype='unix endnotes'
        when /[AF]/; @@dostype='msdos footnotes'
        when /E/;    @@dostype='msdos endnotes'
        end
      else puts "#{sf} not a processed file type"
      end
    end
    def read
      begin
        @md=SiSU_Param::Parameters.new(@opt).get
        @env=SiSU_Env::Info_env.new(@opt.fns)
        path=@env.path.output_tell
        tool=if @opt.cmd =~/[MVv]/; "#{@env.program.text_editor} #{path}/#{@md.fnb}/#{@md.fn[:plain]}"
        else ''
        end
        tell=SiSU_Screen::Ansi.new(@opt.cmd,'Plaintext',tool)
        tell.green_hi_blue unless @opt.cmd =~/q/
        tell=SiSU_Screen::Ansi.new(@opt.cmd,@opt.fns,"#{@env.path.output_tell}/#{@md.fnb}/#{@md.fn[:plain]}")
        tell.flow if @opt.cmd =~/[MV]/
        my_make=SiSU_Env::Create_file.new(@opt.cmd,@opt.fns)
        @dal_array=SiSU_DAL::Source.new(@opt).get # dal file drawn here
        SiSU_Plaintext::Source::Scroll.new(@dal_array,@md).songsheet
        SiSU_Env::Info_skin.new(@md).select #watch
      rescue; SiSU_Errors::Info_error.new($!,$@,@opt.cmd,@opt.fns).error
      ensure
      end
    end
    private
    class Split_text_object <Source
      require "#{SiSU_lib}/plaintext_format"
      include SiSU_Viz
      include Format
      @@alt_id_count=0
      @@dp=nil
      attr_reader :format,:lev,:text,:ocn,:lev_para_ocn
      def initialize(para)
        @para=para
        @format,@ocn='null','null'
        @dp=@@dp ||=SiSU_Env::Info_env.new.digest.pattern
      end
      def lev_segname_para_ocn
        @text=nil
        if @para =~/^(\d~|<:.+?>).+?<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/
          if /^(([1-6])~(\S+))\s+(\S.+?)<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/m.match(@para)
            @format,@lev,segname,@text,@ocn=$1,$2,$3,$4,$5
          elsif  /^(([1-6])~)\s+(\S.+?)<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/m.match(@para)
            @format,@lev,@text,@ocn=$1,$2,$3,$4
          elsif /<:(.+?)>\s*(\S.+?)<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/m.match(@para)
            @format,@text,@ocn=$1,$2,$3
          elsif /^(([1-6])~(\S+))\s+(\S.+?)<~(\d+);(?:\w|[0-6]:)\d+;[um]\d+><#@dp:#@dp>$/m.match(@para)
            @@alt_id_count+=1
            @format,@lev,segname,@text,@ocn=$1,$2,$3,$4,"x#{@@alt_id_count}"
          elsif  /^(([1-6])~)\s+(\S.+?)<~(\d+);[um]\d+;\w\d+><#@dp:#@dp>$/m.match(@para)
            @@alt_id_count+=1
            @format,@lev,@text,@ocn=$1,$2,$3,"x#{@@alt_id_count}"
          end
        else
          if /(.+?)<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/m.match(@para)
            @text,@ocn=$1,$2
          end
          if @para !~/<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$|^$/ #added 2002w06
            @text=/(.+?)/m.match(@para)[1]
          end
          if /^((\d)~(?:~\S+)?)\s+(.+)/m.match(@para)
            @format,@lev,@text=$1,$2,$3
          end
        end
        format=@format.dup
        @lev_para_ocn=if @para =~/.+<~\d+;(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/
          Format::Format_text_object.new(format,@text,@ocn)
        else
          Format::Format_text_object.new(format,@text,"<~(\d+);[um]\d+;\w\d+><#@dp:#@dp>")
        end
        self
      end
    end
    class Scroll <Source
      require "#{SiSU_lib}/defaults"
      require "#{SiSU_lib}/shared_txt"
      include SiSU_text_utils
      @@endnotes_para=[]
      @@plaintext={ :body=>[],:open=>[],:close=>[],:head=>[],:metadata=>[],:tail=>[],:endnotes=>[] }
      @@dp=nil
      def initialize(data,md)
        @data,@md=data,md
        @url_brace=SiSU_Viz::Skin.new.url_decoration
        @vz=SiSU_Env::Get_init.instance.skin
        @dp=@@dp ||=SiSU_Env::Info_env.new.digest.pattern
        @regx=/^(?:(?:<:p[bn]>\s*)?\d~(?:(\S+))?\s+)?(.+?)\s*<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/ #m # 2004w18 pb pn removal added
        @tab="\t"
        @br=case md.cmd
        when /[af]/
          @@dostype='unix footnotes'
          "\n"
        when /e/
          @@dostype='unix endnotes'
          "\n"
        when /[AF]/
          @@dostype='msdos footnotes'
          "\r\n"
        when /E/
          @@dostype='msdos endnotes'
          "\r\n"
        else "\n"
        end
      end
      def songsheet
        @data=markup(@data)
        publish
        #@data.each { |x|  puts x.inspect if x =~/\[table/ }
      end
      # Used for extraction of endnotes from paragraphs
      def extract_endnotes(para='')
        notes=para.scan(/~[{\[]([\d*+]+\s+.+?)\s*<#@dp>[}\]]~/)
        @n=[]
        notes.each do |n| #high cost to deal with <br> appropriately within plaintext, consider
          n=n.dup.to_s
          if n =~/<br(?: \/)?>/
            fix = n.split(/<br(?: \/)?>/) #watch #added
            fix.each do |x|
              unless x.empty?; @n << x
              end
            end
          else                 @n << n
          end
        end
        notes=@n.flatten
        notes.each do |e|
          util=if e.to_s =~/^\[[\d*+]+\]:/; SiSU_text_utils::Wrap.new(e.to_s,70,4,1)
          else                              SiSU_text_utils::Wrap.new(e.to_s,70,1,1)
          end
          wrap=util.line_wrap
          if wrap =~ /^\s*[\d*+]+\s+.+?\s*\Z/m
            wrap.gsub!(/^(\s*)([\d*+]+)\s+(.+?)\s*\Z/m, <<GSUB

\\1[\\2]: \\3
GSUB
                      )
          else
            wrap.gsub!(/^(.+)\Z/m, <<GSUB
\\1
GSUB
                      )
          end
          @@plaintext[:endnotes] << wrap
          @@endnotes_para << wrap
        end
      end
      def plaintext_metadata(meta)
        util=SiSU_text_utils::Wrap.new(meta.text,70,15,1)
        txt=util.line_wrap
        @@plaintext[:metadata] <<= if meta.type == 'meta'
          <<WOK

#{@tab}#{meta.el}: #{txt}
WOK
        else ''
        end
      end
      def plaintext_tail
        SiSU_Env::Info_skin.new(@md).select
        vz=SiSU_Env::Get_init.instance.skin
        generator="Generated by: #{@md.sisu_version[:project]} #{@md.sisu_version[:version]} of #{@md.sisu_version[:date_stamp]} (#{@md.sisu_version[:date]})"  if @md.sisu_version[:version]
        lastdone="Last Generated on: #{Time.now}"
        rubyv="Ruby version: #{@md.ruby_version}"
        sc=if @md.sc_info
          "Source file:    #{@md.sc_filename}#{@br}Version number: #{@md.sc_number}#{@br}Version date:   #{@md.sc_date}#{@br}"
        else ''
        end
        @@plaintext[:tail] <<<<WOK
#@br
Other versions of this document: #@br
manifest:
   #{vz.url_root_http}/#{@md.fnb}/#{@md.fn[:manifest]}#@br
html:
   #{vz.url_root_http}/#{@md.fnb}/#{@md.fn[:toc]}#@br
pdf:
   #{vz.url_root_http}/#{@md.fnb}/#{@md.fn[:pdf_p]}
   #{vz.url_root_http}/#{@md.fnb}/#{@md.fn[:pdf_l]}#@br
plaintext (plain text):
   #{vz.url_root_http}/#{@md.fnb}/#{@md.fn[:plain]}#@br
at:
   #{vz.url_site}#@br

#{sc}
* #{generator}
* #{rubyv}
* #{lastdone}
* SiSU #{vz.url_sisu}
WOK
      end
      def plaintext_structure(para='',lv='',ocn='',hname='') #% Used to extract the structure of a document
        lv=lv.to_i
        n=lv - 1
        n3=lv + 2
        lv=nil if lv == 0
        extract_endnotes(para)
        para.gsub!(/~[{\[]([\d*+]+)\s+(?:.+?)[}\]]~/,'[^\1]') # endnote marker marked up
        wrapped=if para[@regx]
          paragraph=para[@regx,2]
          if paragraph =~/<:i([1-9])>/
            m=$1.to_i
            paragraph.gsub!(/<:i#{m}>/,'')
            util=SiSU_text_utils::Wrap.new(paragraph,70,m*2)
          else util=SiSU_text_utils::Wrap.new(paragraph,70,0)
          end
          util.line_wrap
        end
        if lv
          times=wrapped.length
          times=70 if times > 70
          @@plaintext[:body] << case lv
          when 1;      wrapped.upcase << @br << '*'*times << @br
          when 2..3;   wrapped.upcase << @br << '='*times << @br
          when 4;      wrapped.upcase << @br << '-'*times << @br
          when 5..6;   wrapped.upcase << @br << '.'*times << @br
          end
        else
          @@plaintext[:body] << wrapped << @br # main text, contents, body KEEP
        end
        if @@endnotes_para and @@dostype =~/footnote/ #edit out to switch off endnotes following paragraph to which they belong
          @@plaintext[:body] << @br
          @@endnotes_para.each {|e| @@plaintext[:body] << e << @br}
        elsif @@endnotes_para and @@dostype =~/endnote/
          @@plaintext[:body] << @br*2
        end
        @@endnotes_para=[]
      end
      def markup(data)                                                       # Used for major markup instructions
        dir=SiSU_Env::Info_env.new(@md.fns)
        @data_mod,@endnotes,@level,@cont,@copen,@plaintext_contents_close=Array.new(6){[]}
        (0..6).each { |x| @cont[x]=@level[x]=false }
        (4..6).each { |x| @plaintext_contents_close[x]='' }
        plaintext_tail #($1,$2)
        table_message='[table omitted, see other document formats]'
        fix=[]
        data.each do |para|
          para.gsub!(/<!Th?¡.+/m,"#@br#{table_message}")
          para.gsub!(/.+?<-#>/,'')                                           # remove dummy headings (used by html) #check
          para.gsub!(/_\*\s+/,'* ')                                          # bullet markup, marked down
          #para.gsub!(/<br(?: \/)?>/,"\n")                                   # introduces a bug
          para.gsub!(/&#169;/,'©')                                           # bullet markup, marked down
          para.gsub!(/&amp;/,'&')                                            # bullet markup, marked down
          para.gsub!(/<sup>(.+?)<\/sup>/,'^\1^')
          para.gsub!(/<sub>(.+?)<\/sub>/,'[\1]')
          para.gsub!(/<i>(.+?)<\/i>/,'/\1/')
          para.gsub!(/<b>(.+?)<\/b>/,'*\1*')
          para.gsub!(/<u>(.+?)<\/u>/,'_\1_')
          if para =~/<:(?:group|verse|alt|code)(?:-end)?>(?:\s+<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>)?/
            para.gsub!(/<br(?: \/)?>/,"\n")                                   # watch
            para.gsub!(/<:(?:group|verse|alt|code)(?:-end)?>(?:\s+<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>)?/,'')
          end
          para.gsub!(/<:p[bn]>/,'')                                         # remove page breaks
          para.gsub!(/^\s*<~\d+;(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/,'') # remove empty lines - check
          para.gsub!(/(^|\s)(https?:\/\/[^"><]+?)([,.:;"><]?(?:\s|$))/,"\\1#{@url_brace.txt_open}\\2#{@url_brace.txt_close}\\3")
          para.gsub!(/<a href=".+?">(.+?)<\/a>/m,'\1')
          para.gsub!(/<:name#\S+?>/,'')                                       # remove name links
          para.gsub!(/&nbsp;/,' ')                                            # decide on
          para.gsub!(/\{(\S+?\.(?:png|jpg|gif)) .+?\}(?:(?:https?|ftp):\/\/\S+|image)/,'    [ \1 ]') #"[ #{dir.url.images_local}\/\\1 ]")
          para.gsub!(/^\{\S+?\.(?:png|jpg|gif)\s+.+?"(.*?)"\s*\}\S+/,'[image: "\1"]')
          wordlist=para.scan(/\S+/)
          if para =~/^0~(\S+)\s+(.+?)\Z/m # for headers
            d_meta=SiSU_text_utils::Header_scan.new(@md,para).meta
            if d_meta; plaintext_metadata(d_meta)
	          end
          end
          if para !~/(^0~|<ENDNOTES>|<EOF>)/
            if para =~@regx #/.+?<~\d+;\w\d+;\w\d+>.*/ #watch change
              paranum=para[@regx,3]
              @p_num=Format::Paragraph_number.new(paranum)
            end
            @sto=Split_text_object.new(para).lev_segname_para_ocn
            ### problem in scroll, it appears tables are getting paragraph numbers
            m=/<~(\d+);(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/
            if para =~m and para=~/\S+/
              para=case @sto.format
              when /^(1)~(?:(\S+))?/
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body1
              when /^(2)~(?:(\S+))?/
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body2
              when /^(3)~(?:(\S+))?/
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body3
              when /^(4)~(\S+)/ # work on see SiSU_text_parts::Split_text_object
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body4
              when /^(5)~(?:(\S+))?/
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body5
              when /^(6)~(?:(\S+))?/
                plaintext_structure(para,$1,@sto.ocn,$2)
                @sto.lev_para_ocn.heading_body6
              #when /^(i1)$/
              #  #formatMono.gsubBody
              #  #para=@sto[:lev_para_ocn].scrIndent1
              #when /^(i2)$/
              #  formatMono.gsubBody
              #  para=@sto[:lev_para_ocn].scrIndent2
              #when /^(center)$/
              #  para.gsub!(/(.+)/,
              #    %{<center>(\\1)</center>})
              #  para=@sto[:lev_para_ocn].scrPara
              #when /^(b|bold)$/
              #  para.gsub!(/(.+)/,
              #    %{<b>(\\1)</b>})
              #  para=@sto[:lev_para_ocn].scrPara
              #when /null/ # see whether u can improve
              #    if (para !~/#{@margin.txt_0}|#{@margin.txt_1}|#{@margin.txt_2}/)
              #      #formatMono.gsubBody
              #      #para=@sto[:lev_para_ocn].scrPara
              #    end
              else
                plaintext_structure(para,nil,nil,nil) #watch may be problematic
                para
              end
            elsif para =~/#{table_message}/
              @@plaintext[:body] << para << @br
            elsif para =~/(Note|Endnotes?)/ and para !~/<~\d+;(?:\w|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/
            elsif para =~/(MetaData)/ and para =~/<~(\d+);[um]\d+;\w\d+><#@dp:#@dp>$/ #debug 2003w46 add rc info ####suspect visit
              #formatMono=MonoSiSU.new('<br /><a name="metadata">MetaData</a>')
              #para=formatMono.bold_para
            elsif para.include? 'Owner Details' and para !~/<~(\d+);(?:[oh]|[0-6]:)\d+;\w\d+><#@dp:#@dp>$/
              #formatMono=MonoSiSU.new('<br /><a name="owner.details">Owner Details</a>')
              #@@plaintext[:owner_details]=formatMono.bold_para
              #para=''
            elsif para =~/(¡|<!Th?)/ #tables !
            elsif para =~/(.*)<!#!>(.*)/
              one,two=$1,$2
              format_text=Format_text_object.new(one,two)
              para=format_text.seg_no_paranum
            end
            para='' if (para =~/<a name="n\d+">/ and para =~/^(-\{{2}~\d+|<!e[:_]\d+!>)/) # -endnote
            case para
            when /<:i[1-9]>/
              if para =~/.*<:#>.*$/m
                format_text=Format_text_object.new(para,'')
                para=format_text.scr_indent_one_no_paranum
              end
            end
            if para !~/#{@vz.margin_txt_0}|#{@vz.margin_txt_1}|#{@vz.margin_txt_2}/
              # i don't get the condition for no paranum
            end
            if para =~/<:center>/
              one,two=/(.*)<:center>(.*)/.match(para)[1,2]
              format_text=Format_text_object.new(one,two)
              para=format_text.center
            end
            para.gsub!(/<!.+!>/,' ') if para ## Clean Prepared Text
            para.gsub!(/<:\S+>/,' ') if para ## Clean Prepared Text
          end
        end
      end
      def publish
        divider="="
        content=[]
        content << @@plaintext[:open]
        content << @@plaintext[:head]
        content << @@plaintext[:body]
        content << @@plaintext[:endnotes] if @@dostype =~/endnotes/
        content << "#@br#{divider*70}#@br"
        content << @@plaintext[:metadata]
        content << "#@br#{divider*70}#@br" if @md.stmp =~/\w+/ #not used?
        content << @@plaintext[:owner_details] if @md.stmp =~/\w+/ #not used?
        content << @@plaintext[:tail]
        Output.new(content,@md).plaintext
        @@plaintext[:head],@@plaintext[:body],@@plaintext[:tail],@@plaintext[:metadata]=[],[],[],[]
      end
    end
    class Output <Source
      include SiSU_Param
      include SiSU_Env
      def initialize(content,md)
        @content,@md=content,md
      end
      def plaintext                                                            #%plaintext output
        SiSU_Env::SiSU_file.new(@md).mkdir
        filename_plaintext=SiSU_Env::SiSU_file.new(@md,@md.fn[:plain]).mkfile
        @sisu=[]
        @content.each do |para|                                                # this is a hack
          if para.class == Array and para.length > 0
            para.each do |line|
              line.gsub!(/\s+$/m,'')
              filename_plaintext.puts line           #unix plaintext
            end
          else filename_plaintext.puts para           #unix plaintext # /^([*=-]|\.){5}/
          end
        end
      end
    end
  end
end
__END__