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#!/usr/bin/perl
#
# Copyright (c) 2005 Mathieu Roy <yeupou--gnu.org>
# http://yeupou.coleumes.org
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#
# $Id: keduca-shrinker.pl,v 1.3 2005/04/23 11:30:50 yeupou Exp $
use Getopt::Long;
my $getopt;
my $debug;
my $help;
my $input;
my $output;
my $number = "20";
########### Get options, give help
eval {
$getopt = GetOptions("debug" => \$debug,
"help" => \$help,
"number=s" => \$number,
"input=s" => \$input,
"output=s" => \$ouput);
};
if ($help) {
print STDERR <<EOF;
Usage: $0 [OPTION] --input [FILE]
A small program that take a kdeduca test file (.edu) as input with say 100
question and output a kdeduca test file with 20 questions selected randomly.
-i, --input=FILE Input keduca file.
-o, --output=FILE Output keduca file, shrinked.
(By default, the suffix -shrinked will be added)
-n, --number=NUMBER Number expected of questions, in the shrinked
version.
($number by default)
Project Homepage: https://gna.org/projects/keduca-shrinker/
EOF
exit(1);
}
# Test input file existence
unless ($input) {
print "No input file.\n";
}
unless (-r $input) {
print "Input file not readable.\n";
exit;
}
open(INPUT, "< $input");
# Test output writability
unless ($output) {
$output = $input;
$output =~ s/.edu$//;
$output .= "-shrinked.edu";
}
if (-e $output && ! -w $output) {
print "Output file not writable.\n";
exit;
}
open(OUTPUT, "> $output");
########### Define subs
sub fisher_yates_shuffle {
my $table = shift;
my $i;
for ($i = @$table; --$i;) {
my $j = int rand($i+1);
next if $i == $j;
@$table[$i,$j] = @$table[$j,$i];
}
}
########### Grab the file header, store questions in an array.
# I know, it's XML, it may be simple to call an xml parser.
# But in fact, we have nothing to parse here, we do not care about
# the real content, so...
my $structure = "header";
my $header;
my $footer;
my @questions;
my $newquestion;
while (<INPUT>) {
## Grab the structure (footer and header)
# the header last when data begins
# the footer begin when data ends
$header .= $_ if $structure eq "header";
$structure = "content" if /\<Data\>/m;
$structure = "footer" if /\<\/Data\>/m;
$footer .= $_ if $structure eq "footer";
## Grab the questions
if ($structure eq "content") {
$newquestion .= $_;
# If we found the string </question>, that the end of a question
if (/\<\/question\>/m) {
push(@questions, $newquestion);
$newquestion = "";
}
}
}
########### Select the number of questions we want
# warn the user if there's nothing to do
if (scalar(@questions) < $number) {
print "There are only ".scalar(@questions)." questions in the input file, less than $number.\n";
# Copy & exit
system("cp", $input, $output);
exit;
} else {
# Shuffle
fisher_yates_shuffle(\@questions);
# Keeps only the desired amount (number-1, as 0 is counted)
$#questions = ($number-1);
}
########### Final output
print OUTPUT $header;
print OUTPUT @questions;
print OUTPUT $footer;
close(INPUT);
close(OUTPUT);
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