# encoding: utf-8
=begin

 * Name: SiSU

 * Description: a framework for document structuring, publishing and search
   #___#

 * Author: Ralph Amissah

 * Copyright: (C) 1997 - 2011, Ralph Amissah, All Rights Reserved.

 * License: GPL 3 or later:

   SiSU, a framework for document structuring, publishing and search

   Copyright (C) Ralph Amissah

   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 3 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, see <http://www.gnu.org/licenses/>.

   If you have Internet connection, the latest version of the GPL should be
   available at these locations:
   <http://www.fsf.org/licensing/licenses/gpl.html>
   <http://www.gnu.org/copyleft/gpl.html>

   <http://www.jus.uio.no/sisu/gpl.fsf/toc.html>
   <http://www.jus.uio.no/sisu/gpl.fsf/doc.html>
   <http://www.jus.uio.no/sisu/gpl.fsf/plain.txt>

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

 * Hompages:
   <http://www.jus.uio.no/sisu>
   <http://www.sisudoc.org>

 * Download:
   <http://www.jus.uio.no/sisu/SiSU/download.html>

 * Ralph Amissah
   <ralph@amissah.com>
   <ralph.amissah@gmail.com>

 ** Description: system environment, resource control and configuration details

=end
module SiSU_text_representation
  class Alter
    def initialize(x)
      if x.class==String
        @t_o,@s=nil,x
      else
        @t_o,@s=x,x.obj.dup
      end
    end
    def strip_clean_of_extra_spaces                                              # dal output tuned
      @s=@s.dup
      @s=@s.gsub(/[ ]+([,.;:?](?:$|\s))/,'\1') unless @s =~/#{Mx[:en_a_o]}|#{Mx[:en_b_o]}/
      @s=@s.gsub(/ [ ]+/,' ')
      @s=@s.gsub(/^ [ ]+/,'')
      @s=@s.gsub(/ [ ]+$/,'')
      @s=@s.gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2')
      @s=@s.gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2')
    end
    def strip_clean_of_markup                                                  # text form used in sql db search, used for digest, define rules, make same as in db clean
      @s=@s.dup                                                                  #% same as db clean -->
      @s=@s.gsub(/#{Mx[:fa_bold_o]}(.+?)#{Mx[:fa_bold_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_italics_o]}(.+?)#{Mx[:fa_italics_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_underscore_o]}(.+?)#{Mx[:fa_underscore_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_cite_o]}(.+?)#{Mx[:fa_cite_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_insert_o]}(.+?)#{Mx[:fa_insert_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_strike_o]}(.+?)#{Mx[:fa_strke_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_superscript_o]}(\d+)#{Mx[:fa_superscript_c]}/,'[\1]')
      @s=@s.gsub(/#{Mx[:fa_superscript_o]}(.+?)#{Mx[:fa_superscript_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_subscript_o]}(.+?)#{Mx[:fa_subscript_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:fa_hilite_o]}(.+?)#{Mx[:fa_hilite_c]}/,'\1')
      @s=@s.gsub(/#{Mx[:gl_o]}#(?:126|152)#{Mx[:gl_c]}/i,'~')
      @s=@s.gsub(/#{Mx[:en_a_o]}([\d*+]+)\s+(?:.+?)#{Mx[:en_a_c]}/,'') # endnote removed
      @s=@s.gsub(/#{Mx[:en_b_o]}([\d*+]+)\s+(?:.+?)#{Mx[:en_b_c]}/,'') # endnote removed
      @s=@s.gsub(/(?:#{Mx[:nbsp]})+/,' ')
      @s=@s.gsub(/(?:#{Mx[:br_nl]})+/,"\n")
      @s=@s.gsub(/(?:#{Mx[:br_paragraph]})+/,"\n")
      @s=@s.gsub(/(?:#{Mx[:br_line]})+/,"\n")
      @s=@s.gsub(/#{Mx[:gl_o]}(?:#lt|#060)#{Mx[:gl_c]}/,'<')
      @s=@s.gsub(/#{Mx[:gl_o]}(?:#gt|#062)#{Mx[:gl_c]}/,'>')
      @s=@s.gsub(/#{Mx[:gl_o]}#(?:038|amp)#{Mx[:gl_c]}/,'&')
      @s=@s.gsub(/#{Mx[:gl_o]}#033#{Mx[:gl_c]}/,'!')
      @s=@s.gsub(/#{Mx[:gl_o]}#035#{Mx[:gl_c]}/,'#')
      @s=@s.gsub(/#{Mx[:gl_o]}#042#{Mx[:gl_c]}/,'*')
      @s=@s.gsub(/#{Mx[:gl_o]}#045#{Mx[:gl_c]}/,'-')
      @s=@s.gsub(/#{Mx[:gl_o]}#047#{Mx[:gl_c]}/,'/')
      @s=@s.gsub(/#{Mx[:gl_o]}#095#{Mx[:gl_c]}/,'_')
      @s=@s.gsub(/#{Mx[:gl_o]}#123#{Mx[:gl_c]}/,'{')
      @s=@s.gsub(/#{Mx[:gl_o]}#125#{Mx[:gl_c]}/,'}')
      @s=@s.gsub(/#{Mx[:gl_o]}#126#{Mx[:gl_c]}/,'~')
      @s=@s.gsub(/#{Mx[:gl_o]}#169#{Mx[:gl_c]}/,'©')
      @s=@s.gsub(/\s\s+/,' ')
      @s=@s.gsub(/\s\s+/,' ')
      @s=@s.strip
    end
    def semi_revert_markup                                             # used for digest, define rules, make same as in db clean
      if @t_o
        @s=@s.gsub(/#{Mx[:fa_bold_o]}(.+?)#{Mx[:fa_bold_c]}/,'*{\1}*')
        @s=@s.gsub(/#{Mx[:fa_italics_o]}(.+?)#{Mx[:fa_italics_c]}/,'/{\1}/')
        @s=@s.gsub(/#{Mx[:fa_underscore_o]}(.+?)#{Mx[:fa_underscore_c]}/,'_{\1}_')
        @s=@s.gsub(/#{Mx[:fa_cite_o]}(.+?)#{Mx[:fa_cite_c]}/,'"{\1}"')
        @s=@s.gsub(/#{Mx[:fa_insert_o]}(.+?)#{Mx[:fa_insert_c]}/,'+{\1}+')
        @s=@s.gsub(/#{Mx[:fa_strike_o]}(.+?)#{Mx[:fa_strke_c]}/,'-{\1}-')
        @s=@s.gsub(/#{Mx[:fa_superscript_o]}(.+?)#{Mx[:fa_superscript_c]}/,'^{\1}^')
        @s=@s.gsub(/#{Mx[:fa_subscript_o]}(.+?)#{Mx[:fa_subscript_c]}/,',{\1},')
        @s=@s.gsub(/#{Mx[:gl_o]}#(?:126|152)#{Mx[:gl_c]}/i,'~')
        @s=@s.gsub(/#{Mx[:en_a_o]}([\d*+]+\s+.+?)#{Mx[:en_a_c]}/,'~{\1}~') # endnote marker marked up
        @s=@s.gsub(/#{Mx[:en_b_o]}([\d*+]+\s+.+?)#{Mx[:en_b_c]}/,'~[\1]~') # endnote marker marked up
        if @t_o.is=='heading' or @t_o.is=='para'
          @s=@s.gsub(/ [ ]+/,' ')
          @s=@s.gsub(/(?:#{Mx[:nbsp]})+/,' ')
          if @t_o.is=='heading'
            @s=@t_o.lv + '~ ' + @s
          end
          if @t_o.is=='para'
            if @t_o.bullet_
              @s='_* ' + @s
            end
            if @t_o.indent.to_i > 0
              @s="_#{@t_o.indent} " + @s
              @s=@s.gsub(/^(_[1-9])\s_\*\s/,'\1* ')
            end
          end
        end
        if @t_o.is=='block' \
        or @t_o.is=='group' \
        or @t_o.is=='code'
          @s=@s.gsub(/#{Mx[:nbsp]}/,' ')
          @s="#{@t_o.is}{\n\n#{@s}\n\n}#{@t_o.is}"
          @s=@s.gsub(/(?:#{Mx[:br_nl]}|\n)+/m,"\n\n")
        end
        #dealing with poem and verse calls for change in dal, where start and end verse of poem are marked as such
        @s=@s.strip
      end
      @s
    end
    def html_lite #test whether eventually can be used in db_import replacing shared_html_lite (search for SiSU_Format_Shared)
      if @t_o
        @s=@s.gsub(/#{Mx[:fa_bold_o]}(.+?)#{Mx[:fa_bold_c]}/,'<b>\1</b>')
        @s=@s.gsub(/#{Mx[:fa_italics_o]}(.+?)#{Mx[:fa_italics_c]}/,'<i>\1</i>')
        @s=@s.gsub(/#{Mx[:fa_underscore_o]}(.+?)#{Mx[:fa_underscore_c]}/,'<u>\1</u>')
        @s=@s.gsub(/#{Mx[:fa_cite_o]}(.+?)#{Mx[:fa_cite_c]}/,'"\1"')
        @s=@s.gsub(/#{Mx[:fa_insert_o]}(.+?)#{Mx[:fa_insert_c]}/,'+{\1}+')
        @s=@s.gsub(/#{Mx[:fa_strike_o]}(.+?)#{Mx[:fa_strke_c]}/,'-{\1}-')
        @s=@s.gsub(/#{Mx[:fa_superscript_o]}(.+?)#{Mx[:fa_superscript_c]}/,'<sup>\1</sup>')
        @s=@s.gsub(/#{Mx[:fa_subscript_o]}(.+?)#{Mx[:fa_subscript_c]}/,'<sub>\1</sub>')
        @s=@s.gsub(/#{Mx[:gl_o]}#(?:126|152)#{Mx[:gl_c]}/i,'~')
        if @t_o.is !='code'
          if @s =~/#{Mx[:lnk_o]}.+?#{Mx[:lnk_c]}(?:#{Mx[:url_o]}\S+?#{Mx[:url_c]}|image)/
            wm=@s.scan(/#{Mx[:lnk_o]}.+?#{Mx[:lnk_c]}(?:#{Mx[:url_o]}\S+?#{Mx[:url_c]}|image)|\S+/)
            words=urls(wm)
            @s=@s.gsub(/.+/m,words)
          end
          @s=@s.gsub(/#{Mx[:gl_o]}(#[0-9]{3})#{Mx[:gl_c]}/u,'&\1;')
          @s=@s.gsub(/#{Mx[:gl_o]}#([a-z]{2,4})#{Mx[:gl_c]}/u,'&\1;')
          @s=@s.gsub(/#{Mx[:url_o]}_(\S+?)#{Mx[:url_c]}/,'<a href="\1" target="_top">\1</a>') #http ftp matches escaped, no decoration
          @s=@s.gsub(/(#{Mx[:lnk_c]})#{Mx[:url_o]}(\S+?)#{Mx[:url_c]}/,'\1<a href="\2" target="_top">\2</a>\3') #special case \{ e.g. \}http://url
          @s=@s.gsub(/#{Mx[:url_o]}(\S+?)#{Mx[:url_c]}/,%{#{@url_brace.xml_open}<a href="\\1" target="_top">\\1</a>#{@url_brace.xml_close}}) #http ftp matches with decoration
        else
          @s=@s.gsub(/(^|[^}])_</m,'\1&lt;'); @s.gsub(/(^|[^}])_>/m,'\1&gt;') #code-block: angle brackets special characters
          @s=@s.gsub(/(^|[^}])_</m,'\1&lt;'); @s.gsub(/(^|[^}])_>/m,'\1&gt;')
        end
        if @t_o.is=='paragraph'
          if @t_o.bullet_
            @s=@s
          end
          if @t_o.indent > 0
            @s=@s
          end
        end
        if @t_o.is=='heading'
          @s=@s
        end
      else
        p __FILE__ +':'+ __LINE__.to_s
      end
      @s
    end
  end
  class Modified_text_plus_Hash_digest
    def initialize(md,x)
      @md=md
      if x.class==String
        @t_o,@s=nil,x
      else
        @t_o,@s=x,x.obj.dup
      end
      @env ||=SiSU_Env::Info_env.new(@md.fns)
      @sha_ =((@env.digest.type =='sha256') ? true : false)
      @sha_ ? (require 'digest/sha2') : (require 'digest/md5')
    end
    def digest(txt)
      d=nil
      if @sha_
        for hash_class in [ Digest::SHA256 ]
          d=hash_class.hexdigest(txt)
        end
      else
        for hash_class in [ Digest::MD5 ]
          d=hash_class.hexdigest(txt)
        end
      end
      d
    end
    def strip_clean_of_markup
      def txt
        SiSU_text_representation::Alter.new(@s).strip_clean_of_markup
      end
      def dgst
        en_dgst,img_dgst={},{}
        txt_dgst=digest(txt)
        {:txt=>txt,:dgst_txt=>txt_dgst}
      end
      self
    end
    def semi_revert_markup
      def txt
        SiSU_text_representation::Alter.new(@s).semi_revert_markup
      end
      def dgst
        txt_dgst=digest(txt)
        {:txt=>txt,:dgst_txt=>txt_dgst}
      end
      self
    end
    def composite
      def stripped_clean(txt)
        SiSU_text_representation::Alter.new(txt).strip_clean_of_markup
      end
      def markup_reverted(txt)
        SiSU_text_representation::Alter.new(txt).semi_revert_markup
      end
      def images(imgs)
        sys=SiSU_Env::System_call.new
        line_image=[]
        img_dgst={}
        if imgs and imgs.length > 0
           @image_name,@image_dgst,@img=[],[],[]
           imgs.each do |i|
             image_source=if FileTest.file?("#{@env.path.image_source_include_local}/#{i}")
               @env.path.image_source_include_local
             elsif FileTest.file?("#{@env.path.image_source_include_remote}/#{i}")
               @env.path.image_source_include_remote
             elsif FileTest.file?("#{@env.path.image_source_include}/#{i}")
               @env.path.image_source_include
             else
               SiSU_Screen::Ansi.new(@md.cmd,"ERROR - image:", %{"#{i}" missing}, "search locations: #{@env.path.image_source_include_local}, #{@env.path.image_source_include_remote} and #{@env.path.image_source_include}").error2 unless @md.cmd =~/q/
               nil
             end
             img_type = /\S+\.(png|jpg|gif)/.match(i)[1]
             not_found_msg='image not found'
             if image_source
               para_image = image_source + '/' + i
               image_name = i
               image_dgst =(@sha_ ? sys.sha256(para_image) : sys.md5(para_image))
             else
               image_name = i + ' [image missing]'
               image_dgst = ''
             end
             line_image << {:img_dgst=>image_dgst[1],:img_name=>image_name,:img_type=>img_type}
           end
        end
        line_image
      end
      def endnotes(en)
        en_dgst=[]
        if en and en.length > 0
          en.flatten.each do |e|
             note_no=e.gsub(/^([\d*+]+)\s+.+/,'\1')
             e=digest(stripped_clean(e))
             note_dgst=digest(e)
             en_dgst << {:note_number=>note_no,:note_dgst=>note_dgst}
          end
        end
        en_dgst
      end
      def dgst
        if @t_o.of !='comment' and @t_o.of !='structure' and @t_o.of !='layout'
          en_dgst,img_dgst={},{}
          txt_stripped_dgst=digest(stripped_clean(@t_o))
          txt_markup_reverted_dgst=digest(markup_reverted(@t_o))
          endnotes_dgst=[]
          rgx_notes=/(?:#{Mx[:en_a_o]}|#{Mx[:en_b_o]})([\d*+]+\s+.+?)(?:#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/
          notes=@t_o.obj.scan(rgx_notes)
          endnotes_dgst=endnotes(notes)
          rgx_image=/#{Mx[:lnk_o]}(\S+\.(?:png|jpg|gif))\s.+?#{Mx[:lnk_c]}(?:#{Mx[:url_o]}\S+?#{Mx[:url_c]}|image)/
          imgs=if (@t_o.is=='para' or @t_o.is=='image') \
          and @t_o.obj =~rgx_image
            imgs=@t_o.obj.scan(rgx_image).flatten
            line_image=images(imgs)
          end
          dgst={:is=>@t_o.is,:ocn=>@t_o.ocn,:dgst_stripped_txt=>txt_stripped_dgst,:dgst_markedup_txt=>txt_markup_reverted_dgst}
          dgst[:endnotes]=endnotes_dgst if endnotes_dgst and endnotes_dgst.length > 0
          dgst[:images]=line_image if line_image and line_image.length > 0
        end
        dgst
      end
      self
    end
  end
end
__END__