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Perl Tic Tac Toe

Article by:
Premshree Pillai (9/22/2003)
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Summary:
The classic Tic Tac Toe game written in Perl!
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Rating (194 votes):
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Perl Tic Tac Toe

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Here's a great and fun way for you to get to grips with a bit of perl - Premshree Pillai has put together of the classic game 'Tic Tac Toe' in a Perl script, specially for you.
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#!/usr/bin/perl -T
#############################################################################
#
#    Script:        tic-tac-toe.pl
#    Author:        Premshree Pillai
#    Description:    Tic-Tac-Toe game in Perl
#    Web:        http://www.qiksearch.com
#    E-mail:        qiksearch@rediffmail.com
#    Created:    29/11/02 (dd/mm/yy)
#
#    Â© 2002 Premshree Pillai. All rights reserved.
#
############################################################################

use warnings;

use CGI;
$game = new CGI;
$bsize=3;
$playerToken="X";
$myToken="0";
$gameOver=0;
@winArr;

# Arrays for testing
for($x=0; $x<$bsize*$bsize; $x++)
{
    $rowArr[$x]=0;
    $colArr[$x]=0;
    $digArr[$x]=0;
}

print "Content-type: text/html\n\n";

print '<html>';
print '<head>';
print '<title>Tic Tac Toe in Perl</title>';
print '<style type="text/css">';
print '.main{border:#666666 solid 2px; width:350px}';
print '.btn{font-family:comic sans ms,verdana,arial,helvetica; font-size:20pt; font-weight:bold; background:#CCCCCC; width:50px; height:50px; border:#999999 solid 1px; cursor:hand}';
print '.btn_over{font-family:comic sans ms,verdana,arial,helvetica; font-size:20pt; font-weight:bold; background:#FFFFFF; width:50px; height:50px; border:#999999 solid 1px; cursor:hand}';
print '.btn_down{font-family:comic sans ms,verdana,arial,helvetica; font-size:20pt; font-weight:bold; background:#999999; width:50px; height:50px; border:#999999 solid 1px; cursor:hand}';
print '.footer{font-family:verdana,arial,helvetica; font-size:8pt; color:#FFFFFF}';
print '.link{font-family:verdana,arial,helvetica; font-size:8pt; color:#FFFFFF}';
print '.link:hover{font-family:verdana,arial,helvetica; font-size:8pt; color:#FFCC00}';
print '</style>',"\n";
print '<script language="JavaScript">',"\n";
print 'var doneFlag=false;',"\n";
print 'function toggleVal(who)',"\n";
print '{',"\n";
    print 'var check;';
    print 'eval(\'check=document.ttt.\'+who+\'_btn.value;\');',"\n";
    print 'if(check=="")';
    print '{';
        print 'if(!doneFlag)';
        print '{';
            print 'eval(\'document.ttt.\'+who+\'_btn.value="'.$playerToken.'";\');',"\n";
            print 'eval(\'document.ttt.\'+who+\'_btn.disabled="true";\');',"\n";
            print 'eval(\'document.ttt.\'+who+\'.value="'.$playerToken.'";\');',"\n";
            print 'document.ttt.submit();';
            print 'doneFlag=true;';
            print 'document.getElementById(\'process\').innerHTML="Processing.........";';
        print '}';
    print '}';
    print 'else';
    print '{';
        print 'alert(\'Invalid Move!\');';
    print '}';
print '}',"\n";
print '</script>',"\n";
print '</head>';
print '<body>',"\n";
print '<table width="100%" height="100%"><tr><td align="center">';
print '<table width="346" align="center" bgcolor="#666666" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>';
print '<table width="348" align="center" bgcolor="#666666" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>';
print '<table align="center" cellspacing="0" cellpadding="0" class="main"><tr><td align="center">';
print '<table width="100%" bgcolor="#666666" cellspacing="0" cellpadding="0"><tr><td align="center"><a href="tic-tac-toe.pl"><img src="../ttt_perl.gif" border="0" alt="Tic Tac Toe (in Perl)"></a></td></tr></table>';
print '<table width="100%" bgcolor="#999999" cellspacing="0" cellpadding="0"><tr><td align="center"><a href="http://www.qiksearch.com"><img src="../qiksearch_ttt_perl.gif" border="0" alt="www.qiksearch.com"></a></td></tr></table>';

sub genBox
{
    ($size)=@_;
    my $count=0;
    $retVal='<form name="ttt" method="post" action="tic-tac-toe.pl">';
    for($i=0; $i<$size; $i++)
    {
        for($j=0; $j<$size; $j++)
        {
            $count++;
            $retVal.='<input type="button" name="s'.$count.'_btn" value="" class="btn" onClick="toggleVal(\'s'.$count.'\')" onMouseover="this.className=\'btn_over\'" onMouseout="this.className=\'btn\'" onMousedown="this.className=\'btn_down\'"><input type="hidden" name="s'.$count.'" value="">';
        }
        $retVal.='<br>';
    }
    $retVal.='</form>';
    print $retVal;
}

sub genBox2
{
    ($size,@arr)=@_;
    my $count=0;
    $retVal='<form name="ttt" method="post" action="tic-tac-toe.pl">';
    for($i=0; $i<$size; $i++)
    {
        for($j=0; $j<$size; $j++)
        {
            $count++;
            $retVal.='<input type="button" name="s'.$count.'_btn" value="'.$arr[$count-1].'" class="btn" onClick="toggleVal(\'s'.$count.'\')" onMouseover="this.className=\'btn_over\'" onMouseout="this.className=\'btn\'" onMousedown="this.className=\'btn_down\'"><input type="hidden" name="s'.$count.'" value="'.$arr[$count-1].'">';
        }
        $retVal.='<br>';
    }
    $retVal.='</form>';
    print $retVal;
}

sub isEmpty
{
    ($who)=@_;
    if($who eq "")
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

sub move
{
    my ($bsize,@arr)=@_;
    $count=0;    
    $maxCount=0;
    
    # Build Row Array
    for($i=0; $i<$bsize; $i++)
    {
        $maxCount=0;
        $fullCounter=0;
        for($j=0; $j<$bsize; $j++)
        {
            $count++;
            $who=$arr[$count-1];
            if($who eq $playerToken)
            {
                $maxCount++;
                $fullCounter++;
            }
            if($who eq $myToken)
            {
                $fullCounter++;
            }
        }
        $rowArr[$i]=$maxCount;
        if($fullCounter==$bsize)
        {
            $rowArr[$i]=-1;
        }
    }

    # Building Column Array
    for($i=0; $i<$bsize; $i++)
    {
        $count=$i+1;
        $maxCount=0;
        $fullCounter=0;
        for($j=0; $j<$bsize; $j++)
        {
            $who=$arr[$count-1];
            if($who eq $playerToken)
            {
                $maxCount++;
                $fullCounter++;
            }
            if($who eq $myToken)
            {
                $fullCounter++;
            }
            $count+=$bsize;
        }
        $colArr[$i]=$maxCount;
        if($fullCounter==$bsize)
        {
            $colArr[$i]=-1;
        }
    }

    # Building Diagonal Array
    for($i=0; $i<2; $i++)
    {
        if($i==0)
        {
            $count=$i+1;
        }
        else
        {
            $count=$bsize;
        }
        $maxCount=0;
        $fullCounter=0;
        for($j=0; $j<$bsize; $j++)
        {
            $who=$arr[$count-1];
            if($who eq $playerToken)
            {
                $maxCount++;
                $fullCounter++;
            }
            if($who eq $myToken)
            {
                $fullCounter++;
            }
            if($i==0)
            {
                $count+=$bsize+1;
            }
            else
            {
                $count+=$bsize-1;
            }
        }
        $digArr[$i]=$maxCount;
        if($fullCounter==$bsize)
        {
            $digArr[$i]=-1;
        }
    }

    # Finding Max Values
    $maxRow=max(0,$bsize,"row",@rowArr);
    $maxCol=max(0,$bsize,"col",@colArr);
    $maxDig=max(0,$bsize,"dig",@digArr);
    @maxArrs=(max(1,$bsize,"row",@rowArr),max(1,$bsize,"col",@colArr),max(1,$bsize,"dig",@digArr));
    if(max(0,$bsize,"x",@maxArrs)==0)
    {
        $pos=$bsize*($maxRow+1)-$bsize;
    }
    if(max(0,$bsize,"x",@maxArrs)==1)
    {
        $pos=$maxCol;
    }
    if(max(0,$bsize,"x",@maxArrs)==2)
    {
        if($maxDig==0)
        {
            $pos=$maxDig;
        }
        else
        {
            $pos=$bsize-1;
        }
    }

    $retFlag=0;
    for($y=0; $y<$bsize; $y++)
    {
        if(!$retFlag)
        {
            if($arr[$pos] eq "")
            {
                $retVal=$pos;
                $retFlag=1;
            }
            if(max(0,$bsize,"x",@maxArrs)==0)
            {
                $pos++;
            }
            if(max(0,$bsize,"x",@maxArrs)==1)
            {
                $pos+=$bsize;
            }
            if(max(0,$bsize,"x",@maxArrs)==2)
            {
                if($maxDig==0)
                {
                    $pos+=$bsize+1;
                }
                else
                {
                    $pos+=$bsize-1;
                }
            }
        }
    }
    return $retVal;
}

sub max
{
    ($what,$bsize,$type,@arr)=@_;
    my $max=-1,my $maxIndex=-1;
    if(type ne "dig")
    {
        for($i=0; $i<$bsize; $i++)
        {
            if($arr[$i]>$max)
            {
                $max=$arr[$i];
                $maxIndex=$i;
            }
        }
    }
    if(type eq "dig")
    {
        for($i=0; $i<2; $i++)
        {
            if($arr[$i]>$max)
            {
                $max=$arr[$i];
                $maxIndex=$i;
            }
        }
    }
    if($what==0)
    {
        return $maxIndex;
    }
    else
    {
        return $max;
    }
}

sub playerWin()
{
    $who=$playerToken;
    if(($s1 eq $who && $s2 eq $s1 && $s3 eq $s1) || ($s4 eq $who && $s5 eq $s4 && $s6 eq $s4)||($s7 eq $who && $s8 eq $s7 && $s9 eq $s7) ||($s1 eq $who && $s4 eq $s1 && $s7 eq $s1) ||($s2 eq $who && $s5 eq $s2 && $s8 eq $s2) ||($s3 eq $who && $s6 eq $s3 && $s9 eq $s3) ||($s1 eq $who && $s5 eq $s1 && $s9 eq $s1) ||($s3 eq $who && $s5 eq $s3 && $s7 eq $s3))
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

sub iWin()
{
    $who=$myToken;
    if(($s1 eq $who && $s2 eq $s1 && $s3 eq $s1) || ($s4 eq $who && $s5 eq $s4 && $s6 eq $s4)||($s7 eq $who && $s8 eq $s7 && $s9 eq $s7) ||($s1 eq $who && $s4 eq $s1 && $s7 eq $s1) ||($s2 eq $who && $s5 eq $s2 && $s8 eq $s2) ||($s3 eq $who && $s6 eq $s3 && $s9 eq $s3) ||($s1 eq $who && $s5 eq $s1 && $s9 eq $s1) ||($s3 eq $who && $s5 eq $s3 && $s7 eq $s3))
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

sub whereWinComp()
{
    $who=$myToken;
    if(($s1 eq $who && $s2 eq $s1 && $s3 eq $s1))
    {
        @winArr=('s1','s2','s3');
    }
    if(($s4 eq $who && $s5 eq $s4 && $s6 eq $s4))
    {
        @winArr=('s4','s5','s6');
    }
    if(($s7 eq $who && $s8 eq $s7 && $s9 eq $s7))
    {
        @winArr=('s7','s8','s9');
    }
    if(($s1 eq $who && $s4 eq $s1 && $s7 eq $s1))
    {
        @winArr=('s1','s4','s7');
    }
    if(($s2 eq $who && $s5 eq $s2 && $s8 eq $s2))
    {
        @winArr=('s2','s5','s8');
    }
    if(($s3 eq $who && $s6 eq $s3 && $s9 eq $s3))
    {
        @winArr=('s3','s6','s9');
    }
    if(($s1 eq $who && $s5 eq $s1 && $s9 eq $s1))
    {
        @winArr=('s1','s5','s9');
    }
    if(($s3 eq $who && $s5 eq $s3 && $s7 eq $s3))
    {
        @winArr=('s3','s5','s7');
    }
}

sub whereWinPlayer()
{
    $who=$playerToken;
    if(($s1 eq $who && $s2 eq $s1 && $s3 eq $s1))
    {
        @winArr=('s1','s2','s3');
    }
    if(($s4 eq $who && $s5 eq $s4 && $s6 eq $s4))
    {
        @winArr=('s4','s5','s6');
    }
    if(($s7 eq $who && $s8 eq $s7 && $s9 eq $s7))
    {
        @winArr=('s7','s8','s9');
    }
    if(($s1 eq $who && $s4 eq $s1 && $s7 eq $s1))
    {
        @winArr=('s1','s4','s7');
    }
    if(($s2 eq $who && $s5 eq $s2 && $s8 eq $s2))
    {
        @winArr=('s2','s5','s8');
    }
    if(($s3 eq $who && $s6 eq $s3 && $s9 eq $s3))
    {
        @winArr=('s3','s6','s9');
    }
    if(($s1 eq $who && $s5 eq $s1 && $s9 eq $s1))
    {
        @winArr=('s1','s5','s9');
    }
    if(($s3 eq $who && $s5 eq $s3 && $s7 eq $s3))
    {
        @winArr=('s3','s5','s7');
    }
}

sub draw
{
    my $drawCounter=0;
    foreach(@vals)
    {
        if($_ ne "")
        {
            $drawCounter++;
        }
    }
    if($drawCounter==$bsize*$bsize)
    {
        return 1;
    }
    else
    {
        return 0;
    }
}

if($game->param() && $ENV{'REQUEST_METHOD'} eq "POST")
{
    $s1=$game->param('s1');
    $s2=$game->param('s2');
    $s3=$game->param('s3');
    $s4=$game->param('s4');
    $s5=$game->param('s5');
    $s6=$game->param('s6');
    $s7=$game->param('s7');
    $s8=$game->param('s8');
    $s9=$game->param('s9');
    @vals=($s1,$s2,$s3,$s4,$s5,$s6,$s7,$s8,$s9);

    if(draw() || playerWin())
    {
        $gameOver=1;
    }

    # Computer's Move!
    $movIndex=move($bsize,@vals);
    if(!$gameOver)
    {
        $vals[$movIndex]=$myToken;
    }
    # Update S's
    if(!$gameOver)
    {
        if($movIndex==0)
        {
            $s1=$myToken;
        }
        if($movIndex==1)
        {
            $s2=$myToken;
        }
        if($movIndex==2)
        {
            $s3=$myToken;
        }
        if($movIndex==3)
        {
            $s4=$myToken;
        }
        if($movIndex==4)
        {
            $s5=$myToken;
        }
        if($movIndex==5)
        {
            $s6=$myToken;
        }
        if($movIndex==6)
        {
            $s7=$myToken;
        }
        if($movIndex==7)
        {
            $s8=$myToken;
        }
        if($movIndex==8)
        {
            $s9=$myToken;
        }
    }
    genBox2($bsize,@vals);

    if (playerWin())
    {
        print '<font face="verdana,arial,helvetica" color="#009900" size="4"><b>Wow! You Won!</b></font><br><br>';
        print '<input type="button" onClick="location.href=\'tic-tac-toe.pl\'" value="Play Again!" style="background:#CCCCCC; font-weight:bold; cursor:hand"><br><br>';
        whereWinPlayer();
        print '<script language="JavaScript">';
        foreach(@winArr)
        {
            print 'document.ttt.',$_,'_btn.style.color=\'#009900\';';
        }
        for($w=0; $w<$bsize*$bsize; $w++)
        {
            if($vals[$w] eq "")
            {
                print 'document.ttt.s',$w+1,'_btn.disabled=true;';
            }
        }
        print '</script>';
        $gameOver=1;
    }
    if (iWin() && !$gameOver)
    {
        print '<font face="verdana,arial,helvetica" color="#FF0000" size="4"><b>Oops! You Lost!</b></font><br><br>';
        print '<input type="button" onClick="location.href=\'tic-tac-toe.pl\'" value="Play Again!" style="background:#CCCCCC; font-weight:bold; cursor:hand"><br><br>';
        whereWinComp();
        print '<script language="JavaScript">';
        foreach(@winArr)
        {
            print 'document.ttt.',$_,'_btn.style.color=\'#FF0000\';';
        }
        for($w=0; $w<$bsize*$bsize; $w++)
        {
            if($vals[$w] eq "")
            {
                print 'document.ttt.s',$w+1,'_btn.disabled=true;';
            }
        }
        print '</script>';
        $gameOver=1;
    }
    if(draw() && !playerWin() && !iWin())
    {
        print '<font face="verdana,arial,helvetica" color="#000000" size="4"><b>It\'s a Draw!</b></font><br><br>';
        print '<input type="button" onClick="location.href=\'tic-tac-toe.pl\'" value="Play Again!" style="background:#CCCCCC; font-weight:bold; cursor:hand"><br><br>';
        print '<script language="JavaScript">';
        for($w=0; $w<$bsize*$bsize; $w++)
        {
            if($vals[$w] eq "")
            {
                print 'document.ttt.s',$w+1,'_btn.disabled=true;';
            }
        }
        print '</script>';
    }
}
else
{
    genBox($bsize);
}

# Processing Div
print '<div style="font-family:verdana,arial,helvetica; font-weight:bold; font-size:10pt; color:#CC0000; background:#CCCCCC; width:100%; padding:3px" id="process"></div>';

print '<table width="100%" bgcolor="#666666"><tr><td><span class="footer">Â© 2002 <a href="http://www.qiksearch.com" class="link">Premshree Pillai</a> | <a href="http://www.guestbookdepot.com/cgi-bin/guestbook.cgi?book_id=374186" class="link">Sign my Guestbook</a>.</span></td></tr></table>';
print '</td></tr></table>';
print '<table width="348" align="center" bgcolor="#666666" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>';
print '<table width="346" align="center" bgcolor="#666666" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>';
print '</td></tr></table>';
print '</body></html>';
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