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#! /usr/local/bin/perl -w
use strict;
use warnings;
use Digest::SHA qw(sha256);
use Getopt::Std;
my %opts;
getopts("c:N:n:", \%opts);
my @preamble = (); # Preamble lines
my @postamble = (); # Postamble lines
my @questions = (); # Array of question hashrefs
# Each question hash has keys:
# {question}: arrayref with question lines
# {answers}: arrayref of arrayrefs with answer lines, correct answer first
# {varid}: idnex in qvars array
my @qvars = (); # Array of question variants
# Each entry is an arrayref of indexes in the questions array
### READ INPUT FILE
if ( 1 ) { ## Keep following variables local
my $in_preamble = 1;
my $in_postamble = 0;
my $in_qvar = 0;
my $curqn;
my $listref = \@preamble;
my $varid;
LINELOOP:
while ($_ = <>) {
if ( $_ =~ m/\\begin\{qcm\}/ ) {
die "wrong placement" unless $in_preamble;
die "bad format" unless $_ eq "\\begin\{qcm\}\n";
$in_preamble = 0;
$listref = undef;
next LINELOOP;
} elsif ( $_ =~ m/\\end\{qcm\}/ ) {
die "wrong placement" if $in_preamble;
die "bad format" unless $_ eq "\\end\{qcm\}\n";
$in_postamble = 0;
$listref = \@postamble;
next LINELOOP;
} elsif ( $_ =~ m/\\begin\{qvar\}/ ) {
die "wrong placement" if $in_preamble || $in_postamble || $in_qvar || defined($curqn);
die "bad format" unless $_ eq "\\begin\{qvar\}\n";
$in_qvar = 1;
push @qvars, [];
next LINELOOP;
} elsif ( $_ =~ m/\\end\{qvar\}/ ) {
die "wrong placement" if $in_preamble || $in_postamble || (!$in_qvar) || defined($curqn);
die "bad format" unless $_ eq "\\end\{qvar\}\n";
$in_qvar = 0;
next LINELOOP;
} elsif ( $_ =~ m/\\begin\{question\}/ ) {
die "wrong placement" if $in_preamble || $in_postamble || defined($curqn);
die "bad format" unless $_ eq "\\begin\{question\}\n";
my %qn = ();
push @qvars, [] unless $in_qvar;
$qn{varid} = $#qvars;
$qn{question} = [];
$qn{answers} = [];
push @questions, \%qn;
push @{$qvars[$#qvars]}, $#questions;
$listref = $qn{question};
$curqn = \%qn;
next LINELOOP;
} elsif ( $_ =~ m/\\end\{question\}/ ) {
die "wrong placement" if $in_preamble || $in_postamble || !defined($curqn);
die "bad format" unless $_ eq "\\end\{question\}\n";
$listref = undef;
$curqn = undef;
next LINELOOP;
} elsif ( $_ =~ m/\\(right)?answer/
&& $_ !~ /\\newcommand/ && $_ !~ /\\let\\rightanswer/ ) {
die "wrong placement" if $in_preamble || $in_postamble || !defined($curqn);
die "bad format" unless $_ eq "\\answer\n" || $_ eq "\\rightanswer\n";
die "this is impossible" unless ref($curqn) eq "HASH" && defined $curqn->{answers};
die "right answer should come first" unless ($_ eq "\\rightanswer\n") == (scalar(@{$curqn->{answers}}) == 0);
my @ans = ();
push @{$curqn->{answers}}, \@ans;
$listref = \@ans;
## no next LINELOOP here: include \answer in answer itself!
}
die "this is impossible" if $in_preamble && $in_postamble;
die "this is impossible" if $in_preamble && ($listref ne \@preamble);
die "this is impossible" if $in_postamble && ($listref ne \@postamble);
push @{$listref}, $_ if defined($listref);
}
}
### RANDOMIZE
my $commonseed = $opts{N} // "";
my $seed = $opts{n} // "";
my $nbqn = $opts{c} // int((scalar(@qvars)+1)/2);
my @questab = ();
my @quesanstab = ();
if ( 1 ) { ## Keep following variables local
my @hashlist;
for ( my $u=0 ; $u<scalar(@qvars) ; $u++ ) {
push @hashlist, sha256("${commonseed}\n${seed}\nQV\n${u}\n");
}
my @qvartab = sort { $hashlist[$a] cmp $hashlist[$b] } (0..(scalar(@qvars)-1));
for ( my $k=0 ; $k<scalar(@qvartab) && $k<$nbqn ; $k++ ) {
my $u = $qvartab[$k];
@hashlist = ();
for ( my $kv=0 ; $kv<scalar(@{$qvars[$u]}) ; $kv++ ) {
my $i = $qvars[$u]->[$kv];
push @hashlist, sha256("${commonseed}\n${seed}\nQ\n${i}\n");
}
my $kv = (sort { $hashlist[$a] cmp $hashlist[$b] } (0..(scalar(@{$qvars[$u]})-1)))[0];
my $i = $qvars[$u]->[$kv];
die "this is impossible" unless $questions[$i]->{varid} == $u;
push @questab, $i;
}
for ( my $i=0 ; $i<scalar(@questions) ; $i++ ) {
@hashlist = ();
my $r = $questions[$i]->{answers};
for ( my $j=0 ; $j<scalar(@$r) ; $j++ ) {
push @hashlist, sha256("${commonseed}\n${seed}\nQ\n${i}\nA\n${j}\n");
}
my @anstab;
@anstab = sort { $hashlist[$a] cmp $hashlist[$b] } (0..(scalar(@$r)-1));
push @quesanstab, \@anstab;
}
}
### WRITE OUTPUT FILE
my @correct;
foreach my $l ( @preamble ) {
print $l;
}
print "\\begin\{qcm\}\n\n";
for ( my $k=0 ; $k<scalar(@questab) ; $k++ ) {
my $i = $questab[$k];
my $qn = $questions[$i];
print "\\begin\{question\}\n";
foreach my $l ( @{$qn->{question}} ) {
print $l;
}
for ( my $kj=0 ; $kj<scalar(@{$quesanstab[$i]}) ; $kj++ ) {
my $j = $quesanstab[$i]->[$kj];
my $a = $qn->{answers}->[$j];
foreach my $l ( @{$a} ) {
print $l;
}
push @correct, sprintf("%d%s", $k+1, chr(ord("A")+$kj)) if $j==0;
}
print "\\end\{question\}\n\n";
}
print "\\end\{qcm\}\n\n";
printf "\%\% === %s ===\n", join(" ", @correct);
printf "\\ifcorrige\\bigskip\\noindent\\textbf{Corrigé.} %s\\fi\n", join(" ", @correct);
foreach my $l ( @postamble ) {
print $l;
}
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