#!/usr/bin/env ruby

$handle = File.open(ARGV[0],"r")
$current_line = ""

$ah     ="^\s*<accountHolderName>.*<\/accountHolderName>\s*\n"
$aah    ="^\s*<additionalaccountHolders>.*<\/additionalaccountHolders>\s*\n"

def chunks()     
        Enumerator.new do |chunk|
             loop do
                     new = get_chunk()
                     if !new then break end
                     chunk << new
              end
        end
end

def get_chunk()
        while !$handle.eof do
                current_chunk = ( current_chunk ? current_chunk : "") + $current_line
                $current_line = $handle.readline
                if $current_line.match(/holder>/) then
                        return current_chunk
                end
        end
        return current_chunk
end

def reorder(chunk)
        ah_current=chunk.match(/(#{$ah})/im)
        aah_current=chunk.match(/#{$aah}/im)
        chunk.gsub!(/#{$aah}/im,"")
        chunk.gsub!(/#{$ah}/,"#{ah_current}#{aah_current}")
        return chunk
end

chunks.each {|c| puts reorder(c)}

reorder.rb data.xml

#!/usr/bin/env ruby

class ChunkCollection
        def initialize(file)
                @handle = File.open(file,"r")
                @current_line=@data=""
        end
        def chunks()
                Enumerator.new do |c|
                     loop do
                             if data = get_chunk() then
                                     c << Chunk.new(data) 
                             else 
                                     break
                             end
                      end
                end
        end
        def get_chunk()
                while !@handle.eof do
                        current_chunk = ( current_chunk ? current_chunk : "") + @current_line
                        @current_line = @handle.readline
                        return current_chunk if @current_line.match(/holder>/) 
                end
        end
        def reorder() 
                chunks.each {|c| @data+=c.reorder()}
                return self
        end
        def show() puts @data end
end     

class Chunk
        def initialize(data) 
                @ah     ="^\s*<accountHolderName>.*<\/accountHolderName>\s*\n"
                @aah    ="^\s*<additionalaccountHolders>.*<\/additionalaccountHolders>\s*\n"
                @chunk = data
        end
        def reorder()
                ah_current=@chunk.match(/(#{@ah})/im)
                aah_current=@chunk.match(/#{@aah}/im)
                return @chunk.gsub(/#{@aah}/im,"").
                        gsub(/#{@ah}/,"#{ah_current}#{aah_current}")
        end
end

ChunkCollection.new(ARGV[0]).reorder.show