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+# encoding: utf-8
+=begin
+
+ * Name: SiSU
+
+ * Description: a framework for document structuring, publishing and search
+
+ * Author: Ralph Amissah
+
+ * Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+ 2007, 2008, 2009, 2010, 2011, 2012, 2013 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/licenses/gpl.html>
+
+ <http://www.sisudoc.org/sisu/en/manifest/gpl.fsf.html>
+
+ * 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.sisudoc.org/sisu/en/SiSU/download.html>
+
+ * Git
+ <http://sources.sisudoc.org/gitweb/?p=code/sisu.git;a=summary>
+ <http://sources.sisudoc.org/?p=code/sisu.git;a=blob;f=lib/sisu/v5/dal_hash_digest.rb;hb=HEAD>
+
+ * Ralph Amissah
+ <ralph@amissah.com>
+ <ralph.amissah@gmail.com>
+
+ ** Description: system environment, resource control and configuration details
+
+=end
+module SiSU_DAL_Hash
+ require_relative 'shared_markup_alt.rb' #shared_markup_alt.rb
+ class ObjectDigest
+ def initialize(md,data,env=nil)
+ @md,@data,@env=md,data,env
+ @env ||=SiSU_Env::InfoEnv.new(@md.fns)
+ end
+ def object_digest
+ # 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]
+ data=@data.compact
+ @tuned_file=[]
+ sha_ =(@env.digest.type=='sha256' ? true : false)
+ sha_ ? (require 'digest/sha2') : (require 'digest/md5')
+ data.each do |t_o|
+ unless t_o.obj.is_a?(Array)
+ t_o.obj=t_o.obj.strip
+ end
+ if (t_o.of !=:structure \
+ && t_o.of !=:comment \
+ && t_o.of !=:layout) \
+ && t_o.ocn.is_a?(Fixnum)
+ if sha_
+ for hash_class in [ Digest::SHA256 ]
+ @tuned_file << stamped(t_o,hash_class)
+ end
+ else
+ for hash_class in [ Digest::MD5 ]
+ @tuned_file << stamped(t_o,hash_class)
+ end
+ end
+ else @tuned_file << t_o unless t_o.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)
+ t_o_bit=[]
+ data.each do |en_plus|
+ t_o_bit <<= case en_plus
+ when /#{Mx[:en_a_o]}|#{Mx[:en_b_o]}/
+ if en_plus =~/#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]}/
+ t_o_txt,en_open,en_txt,en_close=/(.*?)(#{Mx[:en_a_o]}|#{Mx[:en_b_o]})(.+?)(#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/m.match(en_plus)[1..4]
+ stripped_en=SiSU_TextRepresentation::Alter.new(en_txt).strip_clean_of_markup
+ digest_en_strip=if @env.digest.type =~/sha256/
+ Digest::SHA256.hexdigest(stripped_en)
+ else
+ Digest::MD5.hexdigest(stripped_en)
+ end
+ t_o_txt + en_open + en_txt + Mx[:id_o] + digest_en_strip + Mx[:id_c] + en_close
+ else STDERR.puts "Error Exception - problem encountered with:\n#{en_plus}" #arbitrary exception, tidy up
+ end
+ else en_plus
+ end
+ end
+ t_o_bit.join
+ end
+ def stamped(t_o,hash_class) #decide what hash information is most useful, is compromise necessary?
+ t_o.obj=SiSU_TextRepresentation::Alter.new(t_o).strip_clean_of_extra_spaces
+ t_obj=t_o.inspect.sub(/:0x[0-9a-f]{8}\s/,': ')
+ stripped=SiSU_TextRepresentation::Alter.new(t_o).strip_clean_of_markup
+ markup=SiSU_TextRepresentation::Alter.new(t_o).semi_revert_markup
+ digests=SiSU_TextRepresentation::ModifiedTextPlusHashDigest.new(@md,t_o).composite.dgst
+ unless t_o.is==:code
+ case t_o.obj
+ when /#{Mx[:en_a_o]}[\d*+]+\s+.+?#{Mx[:en_a_c]}|#{Mx[:en_b_o]}[*+]\d+\s+.+?#{Mx[:en_b_c]}/m
+ en_and_t_o,en_and_t_o_digest=[],[]
+ t_o.obj=t_o.obj.gsub(/\s*(#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/m,' \1') #watch
+ t_o_plus_en=t_o.obj.scan(/.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]}/m)
+ t_o_tail=if t_o.obj =~/(?:.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]})+([\s\S]+)/m
+ /(?:.*?#{Mx[:en_a_o]}.+?#{Mx[:en_a_c]}|.*?#{Mx[:en_b_o]}.+?#{Mx[:en_b_c]})+.*/m.match(t_o.obj)[1]
+ else ''
+ end
+ t_o_plus_en << t_o_tail
+ en_and_t_o_digest << endnote_digest(t_o_plus_en)
+ t_o_new=en_and_t_o_digest.join(' ')
+ #@tuned << t_o_new + Mx[:id_o] + digest_strip + ':' + digest_all + Mx[:id_c] unless t_o.nil?
+ else #@tuned << t_o + Mx[:id_o] + digest_strip + ':' + digest_all + Mx[:id_c] unless t_o.nil?
+ end
+ else #@tuned << t_o + Mx[:id_o] + digest_strip + ':' + digest_all + Mx[:id_c] unless t_o.nil?
+ end
+ t_o #KEEP intact
+ end
+ def strip_clean_extra_spaces(s) # dal output tuned
+ s=s.dup
+ s=s.gsub(/[ ]+([,.;:?](?:$|\s))/,'\1') unless s =~/#{Mx[:en_a_o]}|#{Mx[:en_b_o]}/
+ s=s.gsub(/ [ ]+/,' ').
+ gsub(/^ [ ]+/,'').
+ gsub(/ [ ]+$/,'').
+ gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2').
+ gsub(/((?:#{Mx[:fa_bold_c]}|#{Mx[:fa_italics_c]})')[ ]+(s )/,'\1\2')
+ end
+ end
+end
+__END__