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See [[Tetris/Microsoft_Small_Basic|Tetris/Microsoft Small Basic]].
=={{header|Perl}}==
Very basic tetris. Use arrow keys for left and right (or 'h' and 'l'), up arrow for rotate (or 'r'),
and down arrow for instant drop (or 'j').
<lang perl>#!/usr/bin/perl
use strict;
use warnings;
use Curses;
use Term::ReadKey;
use Time::HiRes qw( time );
use IO::Select;
my $delay = 1;
my $width = 12;
my $oneshort = $width - 1;
my $g3 = qr/(..{$oneshort})/s;
my $g4 = qr/(.{$oneshort})/s;
my $below = qr/....{$oneshort}/s;
my $height = 20;
my $well = ( '|' . ' ' x $width . "|\n" ) x $height . '-' x($width + 2) . "\n";
my $piece;
my $nexttime = time + $delay;
my $sel = IO::Select->new( *STDIN );
sub transpose
{
local $_ = $well;
$well = '';
$well .= "\n" while s/^./ $well .= $&; ''/gem;
}
sub place
{
substr $well, $width / 2 - 1 + ($width + 3) * $_, 4, shift for 0 .. 3;
}
my %shape =
(
I => [' O ', ' O ', ' O ', ' O '],
J => [' ', ' ', 'OOO ', ' O '],
L => [' ', ' ', ' OOO', ' O '],
O => [' ', ' ', ' OO ', ' OO '],
S => [' ', ' ', ' OO ', 'OO '],
T => [' ', ' ', ' O ', 'OOO '],
Z => [' ', ' ', ' OO ', ' OO'],
);
sub add
{
if( $well =~ /^(. *.\n){4}/ )
{
place $shape{$piece}->@*;
$piece = (keys %shape)[rand keys %shape];
}
else
{
die "end of game\n";
}
}
sub rotate
{
s/ ${g3}OO $g3 OO/ O$1 OO$2 O / or # Z
s/ O$g3 OO$g3 O / $1OO $2 OO/ or
s/ $g3 OO${g3}OO / O $1 OO$2 O/ or # S
s/ O $g3 OO$g3 O/ $1 OO$2OO / or
s/ ${g3}OOO${g3}O /OO $1 O $2 O / or # L
s/OO $g3 O $g3 O / $1 O$2OOO/ or
s/ $g3 O${g3}OOO/ O $1 O $2 OO/ or
s/ O $g3 O $g3 OO/ $1OOO$2O / or
s/ ${g3}OOO$g3 O/ O $1 O $2OO / or # J
s/ O $g3 O ${g3}OO / $1O $2OOO/ or
s/ ${g3}O ${g3}OOO/ OO$1 O $2 O / or
s/ OO$g3 O $g3 O / $1OOO$2 O/ or
s/ $g3 O ${g3}OOO/ O $1 OO$2 O / or # T
s/ O $g3 OO$g3 O / $1OOO$2 O / or
s/ ${g3}OOO$g3 O / O $1OO $2 O / or
s/ O ${g3}OO $g3 O / $1 O $2OOO/ or
s/ $g4 $g4 ${g4}OOOO/ O $1 O $2 O $3 O / or # I
s/ O $g4 O $g4 O $g4 O / $1 $2 $3OOOO/ or
s/O ${g4}O ${g4}O ${g4}O / $1 $2 $3OOOO/ or
s/ O$g4 O$g4 O$g4 O/ $1 $2 $3OOOO/
for $well;
}
sub step
{
if( $well =~ s/(?<=\|)#{$width}(?=\|)/ '=' x $width /e ) # full row?
{
transpose();
$well =~ s/(.*)=/ $1/g; # remove full row
transpose();
}
elsif( $well !~ /O/ ) # any O ?
{
add();
}
elsif( not down() ) # can't move down
{
$well =~ tr/O/#/; # convert to #
}
}
sub down
{
$well !~ /O/ || $well =~ /O$below[#-]/ and return 0;
transpose();
$well =~ s/(O+) / $1/g;
transpose();
return 1;
}
sub drop { 1 while down() }
sub right { $well =~ /O[#|]/ or $well =~ s/(O+) / $1/g }
sub left { $well =~ /[#|]O/ or $well =~ s/ (O+)/$1 /g }
sub draw
{
addstr( 2, 0, ($well . "\n\n") =~ s/^/' ' x 20 /gmer);
my $row = 4;
addstr( $row++, 10, $_ ) for @{ $shape{$piece} };
addstr( 22, 0, ' ' );
refresh;
};
sub eventloop
{
while( 1 )
{
my $time = time;
my $delta = $nexttime - $time;
if( $delta <= 0 )
{
step();
$nexttime = time + $delay;
}
else
{
draw();
for ( $sel->can_read( $delta ) )
{
sysread *STDIN, $_, 1024;
for ( /\e(?:\[M...|[O\[][0-9;]*[A-~])|./gs ) # keep esc seq together
{
/^(?:q|\e)\z/i ? die "quit\n" :
/^(?:h|\e\[D)\z/ ? left() :
/^(?:l|\e\[C)\z/ ? right() :
/^(?:r|\e\[A)\z/ ? rotate() :
/^(?:[j ]|\e\[B)\z/ ? drop() :
0;
}
}
}
}
}
$piece = (keys %shape)[rand keys %shape];
initscr();
clear;
ReadMode 'cbreak';
eval { eventloop() };
my $errormsg = $@;
ReadMode 'restore';
endwin();
print $errormsg;</lang>
=={{header|Phix}}==
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