#!/usr/bin/perl
#--------------
#txtattack.pl
#
#this is a script which takes text input by default and outputs DocBook XML by default having guessed at the semantic structure of the text.
#At the moment it's arranged in such a way that allows for expansion, including the development of a module based on this as a template
use strict;
use warnings;
use vars qw($articlename $headertest $nextline $lnapply $writestart $writetitle $writeelement $writeheader $writeend $lineallowance $informat $outformat $val $marker $line $isheader $string $paranumber $articlename);
$informat = "text";
$outformat = "DocBook";
$lineallowance = 0;

#here should go the code for overriding the defaults
#
#but in the meantime i'll happily setup blind defaults and do the modularity bit later, as i've seperated it all cool like
#good for testing ;-)

if($informat eq "text"){
	$articlename = sub{
		my $val = <SOURCE>;
		chomp($val);
		return $val;
	};
	$nextline = sub{
		return <SOURCE>;
	};
	$headertest = sub{
		if($string eq "\n" and $marker > $lineallowance){
			$isheader = 1;
		}
	};
}

if($outformat eq "DocBook"){
	$writestart = sub{
 		print '<?xml version="1.0" encoding="UTF-8"?>';
 		print '<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">';
 		print "\n\n";
	};
	$writetitle = sub{
		print "<article>\n <title>";
		print &$articlename;
		print "</title>";
	};
	$writeelement = sub {
		print "\n<para>\n$line\n</para>\n";
	};
	$writeheader = sub {
# 		print "</chapter>";
# 		print "\n<chapter id=\"$element\">\n";
		print "<title>$line</title>\n";
	};
	$writeend = sub{
		print "\n</article>";
	};
}
$lnapply = sub {
	if($isheader == 0){
	track("break isn't header");
		&$writeelement($line);
	}
	elsif($isheader == 1){
	track("break is header");
		&$writeheader($line);
	 }
};

#---------------------
#sort out all function aliases before here
#--------------------
#and here we have the actual algorithm

sub liberate{
	
if (defined $_[0]){
	open SOURCE, $ARGV[0] or return("$!");
}
else{
	print "usage: semget [file] > [outfile]" and return;
}

$marker = 0;
$isheader = 0;
$paranumber = 0;

&$writestart;
&$writetitle;

while(defined($string = &$nextline)){
	&$headertest($string);
	if($string eq "\n") {
		track("found break");
		if($marker == $lineallowance){
			track("hit line allowance");
			$paranumber++;
			&$lnapply;
			$isheader = 0;
			$line = undef;
		}
		track("redundant break");
		$marker++;
	}
	else{
		chomp($string);
		#track("found text");
		if (defined $line){
			$line = "${line} $string";
		}
		else{
			$line = $string;
		}
		$marker = 0;
	}
#print "$string";
}

&$writeend;

}

liberate($ARGV[0]);

sub track{
	warn "\ntrack:$_[0] at $paranumber";
}