1#!./perl -w
2
3#
4# Tests derived from Japhs.
5#
6# These test use obscure features of Perl, or surprising combinations
7# of features. The tests were added because in the past, they have
8# exposed several bugs in Perl.
9#
10# Some of these tests may actually (mis)use bugs or use undefined behaviour.
11# These tests are still useful - behavioural changes or bugfixes will be
12# noted, and a remark can be put in the documentation. (Don't forget to
13# disable the test!)
14#
15# Getting everything to run well on the myriad of platforms Perl runs on
16# is unfortunately not a trivial task.
17#
18# WARNING: these tests are obfuscated.  Do not get frustrated.
19# Ask Abigail <abigail@foad.org>, or use the Deparse or Concise
20# modules (the former parses Perl to Perl, the latter shows the
21# op syntax tree) like this:
22# ./perl -Ilib -MO=Deparse foo.pl
23# ./perl -Ilib -MO=Concise foo.pl
24#
25
26BEGIN {
27    if (ord("A") == 193) {
28	print "1..0 # Skip: EBCDIC\n"; # For now, until someone has time.
29	exit(0);
30    }
31    chdir 't' if -d 't';
32    @INC = '../lib';
33    require "./test.pl";
34    undef &skip;
35}
36
37skip_all "Unhappy on MacOS" if $^O eq 'MacOS';
38
39#
40# ./test.pl does real evilness by jumping to a label.
41# This function copies the skip from ./test, omitting the goto.
42#
43sub skip {
44    my $why  = shift;
45    my $n    = @_ ? shift : 1;
46    for (1..$n) {
47        my $test = curr_test;
48        print STDOUT "ok $test # skip: $why\n";
49        next_test;
50    }
51}
52
53
54#
55# ./test.pl doesn't give use 'notok', so we make it here.
56#
57sub notok {
58    my ($pass, $name, @mess) = @_;
59    _ok(!$pass, _where(), $name, @mess);
60}
61
62my $JaPH   = "Just another Perl Hacker";
63my $JaPh   = "Just another Perl hacker";
64my $JaPH_n = "Just another Perl Hacker\n";
65my $JaPh_n = "Just another Perl hacker\n";
66my $JaPH_s = "Just another Perl Hacker ";
67my $JaPh_s = "Just another Perl hacker ";
68my $JaPH_c = "Just another Perl Hacker,";
69my $JaPh_c = "Just another Perl hacker,";
70
71plan tests => 130;
72
73{
74    my $out  = sprintf "Just another Perl Hacker";
75    is ($out, $JaPH);
76}
77
78
79{
80    my @primes     = (2,  3,  7, 13, 53, 101,  557, 1429);
81    my @composites = (4, 10, 25, 32, 75, 143, 1333, 1728);
82
83    my %primeness  = ((map {$_ => 1} @primes),
84                      (map {$_ => 0} @composites));
85
86    while (my ($num, $is_prime) = each %primeness) {
87        my $comment = "$num is " . ($is_prime ? "prime." : "composite.");
88
89        my $sub     = $is_prime ? "ok" : "notok";
90
91        &$sub (( 1  x $num) !~ /^1?$|^(11+?)\1+$/,       $comment);
92        &$sub (( 0  x $num) !~ m 0^\0?$|^(\0\0+?)\1+$0,  $comment);
93        &$sub (("m" x $num) !~ m m^\m?$|^(\m\m+?)\1+$mm, $comment);
94    }
95}
96
97
98{   # Some platforms use different quoting techniques.
99    # I do not have access to those platforms to test
100    # things out. So, we'll skip things....
101    if ($^O eq 'MSWin32' ||
102        $^O eq 'NetWare' ||
103        $^O eq 'VMS') {
104            skip "Your platform quotes differently.", 3;
105            last;
106    }
107
108    my $expected  =  $JaPH;
109       $expected  =~ s/ /\n/g;
110       $expected .= "\n";
111    is (runperl (switches => [qw /'-weprint<<EOT;' -eJust -eanother
112                                   -ePerl -eHacker -eEOT/],
113                 verbose  => 0),
114        $expected, "Multiple -e switches");
115
116    is (runperl (switches => [q  !'-wle$_=<<EOT;y/\n/ /;print;'!,
117                              qw ! -eJust -eanother -ePerl -eHacker -eEOT!],
118                 verbose  => 0),
119        $JaPH . " \n", "Multiple -e switches");
120
121    is (runperl (switches => [qw !-wl!],
122                 progs    => [qw !print qq-@{[ qw+ Just
123                                  another Perl Hacker +]}-!],
124                 verbose  => 0),
125        $JaPH_n, "Multiple -e switches");
126}
127
128{
129    if ($^O eq 'MSWin32' ||
130        $^O eq 'NetWare' ||
131        $^O eq 'VMS') {
132            skip "Your platform quotes differently.", 1;
133            last;
134    }
135    is (runperl (switches => [qw /-sweprint --/,
136                              "-_='Just another Perl Hacker'"],
137                 nolib    => 1,
138                 verbose  => 0),
139        $JaPH, 'setting $_ via -s');
140}
141
142{
143    my $datafile = "datatmp000";
144    1 while -f ++ $datafile;
145    END {unlink_all $datafile if $datafile}
146
147    open  MY_DATA, "> $datafile" or die "Failed to open $datafile: $!";
148    print MY_DATA  << "    --";
149        One
150        Two
151        Three
152        Four
153        Five
154        Six
155    --
156    close MY_DATA or die "Failed to close $datafile: $!\n";
157
158    my @progs;
159    my $key;
160    while (<DATA>) {
161        last if /^__END__$/;
162
163        if (/^#{7}(?:\s+(.*))?/) {
164            push @progs => {COMMENT  => $1 || '',
165                            CODE     => '',
166                            SKIP_OS  => [],
167                            ARGS     => [],
168                            SWITCHES => [],};
169            $key = 'CODE';
170            next;
171        }
172        elsif (/^(COMMENT|CODE|ARGS|SWITCHES|EXPECT|SKIP|SKIP_OS)
173                 (?::\s+(.*))?$/sx) {
174            $key = $1;
175            $progs [-1] {$key} = '' unless exists $progs [-1] {$key};
176            next unless defined $2;
177            $_ = $2;
178        }
179        elsif (/^$/) {
180            next;
181        }
182
183        if (ref ($progs [-1] {$key})) {
184            push @{$progs [-1] {$key}} => $_;
185        }
186        else {
187            $progs [-1] {$key} .=  $_;
188        }
189    }
190
191    foreach my $program (@progs) {
192        if (exists $program -> {SKIP}) {
193            chomp  $program -> {SKIP};
194            skip   $program -> {SKIP}, 1;
195            next;
196        }
197
198	chomp @{$program -> {SKIP_OS}};
199        if (@{$program -> {SKIP_OS}}) {
200            if (grep {$^O eq $_} @{$program -> {SKIP_OS}}) {
201                skip "Your OS uses different quoting.", 1;
202                next;
203            }
204        }
205
206        map {s/\$datafile/$datafile/} @{$program -> {ARGS}};
207        $program -> {EXPECT} = $JaPH unless exists $program -> {EXPECT};
208        $program -> {EXPECT} =~ s/\$JaPH_s\b/$JaPH_s/g;
209        $program -> {EXPECT} =~ s/\$JaPh_c\b/$JaPh_c/g;
210        $program -> {EXPECT} =~ s/\$JaPh\b/$JaPh/g;
211        chomp ($program -> {EXPECT}, @{$program -> {SWITCHES}},
212                                     @{$program -> {ARGS}});
213        fresh_perl_is ($program -> {CODE},
214                       $program -> {EXPECT},
215                      {switches => $program -> {SWITCHES},
216                       args     => $program -> {ARGS},
217                       verbose  =>  0},
218                       $program -> {COMMENT});
219    }
220}
221
222{
223    my $progfile = "progtmp000";
224    1 while -f ++ $progfile;
225    END {unlink_all $progfile if $progfile}
226
227    my @programs = (<< '    --', << '    --');
228#!./perl
229BEGIN{$|=$SIG{__WARN__}=sub{$_=$_[0];y-_- -;print/(.)"$/;seek _,-open(_
230,"+<$0"),2;truncate _,tell _;close _;exec$0}}//rekcaH_lreP_rehtona_tsuJ
231    --
232#!./perl
233BEGIN{$SIG{__WARN__}=sub{$_=pop;y-_- -;print/".*(.)"/;
234truncate$0,-1+-s$0;exec$0;}}//rekcaH_lreP_rehtona_tsuJ
235    --
236    chomp @programs;
237
238    if ($^O eq 'VMS' or $^O eq 'MSWin32') {
239        # VMS needs extensions for files to be executable,
240        # but the Japhs above rely on $0 being exactly the
241        # filename of the program.
242        skip $^O, 2 * @programs;
243        last
244    }
245
246    use Config;
247    unless (defined $Config {useperlio}) {
248        skip "Uuseperlio", 2 * @programs;
249        last
250    }
251
252    my $i = 1;
253    foreach my $program (@programs) {
254        open my $fh => "> $progfile" or die "Failed to open $progfile: $!\n";
255        print   $fh $program;
256        close   $fh or die "Failed to close $progfile: $!\n";
257
258        chmod 0755   => $progfile or die "Failed to chmod $progfile: $!\n";
259        my $command  = "./$progfile";
260           $command .= ' 2>&1' unless $^O eq 'MacOS';
261        if ( $^O eq 'qnx' ) {
262          skip "#!./perl not supported in QNX4";
263          skip "#!./perl not supported in QNX4";
264        } else {
265          my $output   = `$command`;
266
267          is ($output, $JaPH, "Self correcting code $i");
268
269                 $output   = `$command`;
270          is ($output, "",    "Self corrected code $i");
271        }
272        $i ++;
273    }
274}
275
276__END__
277#######  Funky loop 1.
278$_ = q ;4a75737420616e6f74686572205065726c204861636b65720as;;
279     for (s;s;s;s;s;s;s;s;s;s;s;s)
280         {s;(..)s?;qq qprint chr 0x$1 and \161 ssq;excess;}
281
282#######  Funky loop 2.
283$_ = q *4a75737420616e6f74686572205065726c204861636b65720a*;
284for ($*=******;$**=******;$**=******) {$**=*******s*..*qq}
285print chr 0x$& and q
286qq}*excess********}
287SKIP_OS: qnx
288
289#######  Funky loop 3.
290$_ = q *4a75737420616e6f74686572205065726c204861636b65720a*;
291for ($*=******;$**=******;$**=******) {$**=*******s*..*qq}
292print chr 0x$& and q
293qq}*excess********}
294SKIP_OS: qnx
295
296#######  Funky loop 4.
297$_ = q ?4a75737420616e6f74686572205065726c204861636b65720as?;??;
298for (??;(??)x??;??)
299    {??;s;(..)s?;qq ?print chr 0x$1 and \161 ss?;excess;??}
300SKIP: Abuses a fixed bug.
301
302#######  Funky loop 5.
303for (s??4a75737420616e6f74686572205065726c204861636b65720as?;??;??)
304    {s?(..)s\??qq \?print chr 0x$1 and q ss\??excess}
305SKIP: Abuses a fixed bug.
306
307#######  Funky loop 6.
308$a = q 94a75737420616e6f74686572205065726c204861636b65720a9 and
309${qq$\x5F$} = q 97265646f9 and s g..g;
310qq e\x63\x68\x72\x20\x30\x78$&eggee;
311{eval if $a =~ s e..eqq qprint chr 0x$& and \x71\x20\x71\x71qeexcess}
312
313#######  Roman Dates.
314@r=reverse(M=>(0)x99=>CM=>(0)x399=>D=>(0)x99=>CD=>(
3150)x299=>C=>(0)x9=>XC=>(0)x39=>L=>(0)x9=>XL=>(0)x29=>X=>IX=>0=>0=>0=>V=>IV=>0=>0
316=>I=>$==-2449231+gm_julian_day+time);do{until($=<$#r){$_.=$r[$#r];$=-=$#r}for(;
317!$r[--$#r];){}}while$=;$,="\x20";print+$_=>September=>MCMXCIII=>=>=>=>=>=>=>=>
318SWITCHES
319-MTimes::JulianDay
320-l
321SKIP: Times::JulianDay not part of the main distribution.
322
323#######  Autoload 1.
324sub _'_{$_'_=~s/$a/$_/}map{$$_=$Z++}Y,a..z,A..X;*{($_::_=sprintf+q=%X==>"$A$Y".
325"$b$r$T$u")=~s~0~O~g;map+_::_,U=>T=>L=>$Z;$_::_}=*_;sub _{print+/.*::(.*)/s};;;
326*{chr($b*$e)}=*_'_;*__=*{chr(1<<$e)};                # Perl 5.6.0 broke this...
327_::_(r(e(k(c(a(H(__(l(r(e(P(__(r(e(h(t(o(n(a(__(t(us(J())))))))))))))))))))))))
328EXPECT: Just__another__Perl__Hacker
329
330#######  Autoload 2.
331$"=$,;*{;qq{@{[(A..Z)[qq[0020191411140003]=~m[..]g]]}}}=*_=sub{print/::(.*)/};
332$\=$/;q<Just another Perl Hacker>->();
333
334#######  Autoload 3.
335$"=$,;*{;qq{@{[(A..Z)[qq[0020191411140003]=~m[..]g]]}}}=*_;
336sub   _   {push         @_ => /::(.*)/s and goto &{ shift}}
337sub shift {print shift; @_              and goto &{+shift}}
338Hack ("Just", "Perl ", " ano", "er\n", "ther "); # YYYYMMDD
339
340#######  Autoload 4.
341$, = " "; sub AUTOLOAD {($AUTOLOAD =~ /::(.*)/) [0];}
342print+Just (), another (), Perl (), Hacker ();
343
344#######  Look ma! No letters!
345$@="\145\143\150\157\040\042\112\165\163\164\040\141\156\157\164".
346   "\150\145\162\040\120\145\162\154\040\110\141\143\153\145\162".
347   "\042\040\076\040\057\144\145\166\057\164\164\171";`$@`
348SKIP: Unix specific
349
350#######  sprintf fun 1.
351sub f{sprintf$_[0],$_[1],$_[2]}print f('%c%s',74,f('%c%s',117,f('%c%s',115,f(
352'%c%s',116,f('%c%s',32,f('%c%s',97,f('%c%s',0x6e,f('%c%s',111,f('%c%s',116,f(
353'%c%s',104,f('%c%s',0x65,f('%c%s',114,f('%c%s',32,f('%c%s',80,f('%c%s',101,f(
354'%c%s',114,f('%c%s',0x6c,f('%c%s',32,f('%c%s',0x48,f('%c%s',97,f('%c%s',99,f(
355'%c%s',107,f('%c%s',101,f('%c%s',114,f('%c%s',10,)))))))))))))))))))))))))
356
357#######  sprintf fun 2.
358sub f{sprintf'%c%s',$_[0],$_[1]}print f(74,f(117,f(115,f(116,f(32,f(97,
359f(110,f(111,f(116,f(104,f(0x65,f(114,f(32,f(80,f(101,f(114,f(0x6c,f(32,
360f(0x48,f(97,f(99,f(107,f(101,f(114,f(10,q ff)))))))))))))))))))))))))
361
362#######  Hanoi.
363%0=map{local$_=$_;reverse+chop,$_}ABC,ACB,BAC,BCA,CAB,CBA;$_=3 .AC;1while+
364s/(\d+)((.)(.))/($0=$1-1)?"$0$3$0{$2}1$2$0$0{$2}$4":"$3 => $4\n"/xeg;print
365EXPECT
366A => C
367A => B
368C => B
369A => C
370B => A
371B => C
372A => C
373
374#######  Funky -p 1
375}{$_=$.
376SWITCHES: -wlp
377ARGS:     $datafile
378EXPECT:   6
379
380#######  Funky -p 2
381}$_=$.;{
382SWITCHES: -wlp
383ARGS:     $datafile
384EXPECT:   6
385
386#######  Funky -p 3
387}{$_=$.}{
388SWITCHES: -wlp
389ARGS:     $datafile
390EXPECT:   6
391
392#######  Funky -p 4
393}{*_=*.}{
394SWITCHES: -wlp
395ARGS:     $datafile
396EXPECT:   6
397
398#######  Funky -p 5
399}for($.){print
400SWITCHES: -wln
401ARGS:     $datafile
402EXPECT:   6
403
404#######  Funky -p 6
405}{print$.
406SWITCHES: -wln
407ARGS:     $datafile
408EXPECT:   6
409
410#######  Funky -p 7
411}print$.;{
412SWITCHES: -wln
413ARGS:     $datafile
414EXPECT:   6
415
416#######  Abusing -M
4171
418SWITCHES
419-Mstrict='}); print "Just another Perl Hacker"; ({'
420-l
421SKIP: No longer works in 5.8.2 and beyond.
422MSWin32
423NetWare
424
425#######  rand
426srand 123456;$-=rand$_--=>@[[$-,$_]=@[[$_,$-]for(reverse+1..(@[=split
427//=>"IGrACVGQ\x02GJCWVhP\x02PL\x02jNMP"));print+(map{$_^q^"^}@[),"\n"
428SKIP: Solaris specific.
429
430#######  print and __PACKAGE__
431package Just_another_Perl_Hacker; sub print {($_=$_[0])=~ s/_/ /g;
432                                      print } sub __PACKAGE__ { &
433                                      print (     __PACKAGE__)} &
434                                                  __PACKAGE__
435                                            (                )
436
437#######  Decorations.
438* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
439/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
440% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % %;
441BEGIN {% % = ($ _ = " " => print "Just another Perl Hacker\n")}
442
443#######  Tie 1
444sub J::FETCH{Just   }$_.='print+"@{[map';sub J::TIESCALAR{bless\my$J,J}
445sub A::FETCH{another}$_.='{tie my($x),$';sub A::TIESCALAR{bless\my$A,A}
446sub P::FETCH{Perl   }$_.='_;$x}qw/J A P';sub P::TIESCALAR{bless\my$P,P}
447sub H::FETCH{Hacker }$_.=' H/]}\n"';eval;sub H::TIESCALAR{bless\my$H,H}
448
449#######  Tie 2
450package Z;use overload'""'=>sub{$b++?Hacker:another};
451sub TIESCALAR{bless\my$y=>Z}sub FETCH{$a++?Perl:Just}
452$,=$";my$x=tie+my$y=>Z;print$y,$x,$y,$x,"\n";#Abigail
453EXPECT: $JaPH_s
454
455#######  Tie 3
456sub A::TIESCALAR{bless\my$x=>A};package B;@q[0..3]=qw/Hacker Perl
457another Just/;use overload'""'=>sub{pop @q};sub A::FETCH{bless\my
458$y=>B}; tie my $shoe => qq 'A';print "$shoe $shoe $shoe $shoe\n";
459
460#######  Tie 4
461sub A::TIESCALAR{bless\my$x=>'A'};package B;@q=qw/Hacker Perl
462another Just/;use overload'""',sub{pop @q};sub A::FETCH{bless
463\my $y=>B};tie my$shoe=>'A';print"$shoe $shoe $shoe $shoe\n";
464
465#######  Tie 5
466tie $" => A; $, = " "; $\ = "\n"; @a = ("") x 2; print map {"@a"} 1 .. 4;
467sub A::TIESCALAR {bless \my $A => A} #  Yet Another silly JAPH by Abigail
468sub A::FETCH     {@q = qw /Just Another Perl Hacker/ unless @q; shift @q}
469SKIP: Pending a bug fix.
470
471#######  Prototype fun 1
472sub camel (^#87=i@J&&&#]u'^^s]#'#={123{#}7890t[0.9]9@+*`"'***}A&&&}n2o}00}t324i;
473h[{e **###{r{+P={**{e^^^#'#i@{r'^=^{l+{#}H***i[0.9]&@a5`"':&^;&^,*&^$43##@@####;
474c}^^^&&&k}&&&}#=e*****[]}'r####'`=437*{#};::'1[0.9]2@43`"'*#==[[.{{],,,1278@#@);
475print+((($llama=prototype'camel')=~y|+{#}$=^*&[0-9]i@:;`"',.| |d)&&$llama."\n");
476SKIP: Abuses a fixed bug.
477
478#######  Prototype fun 2
479print prototype sub "Just another Perl Hacker" {};
480SKIP: Abuses a fixed bug.
481
482#######  Prototype fun 3
483sub _ "Just another Perl Hacker"; print prototype \&_
484SKIP: Abuses a fixed bug.
485
486#######  Split 1
487               split // => '"';
488${"@_"} = "/"; split // => eval join "+" => 1 .. 7;
489*{"@_"} = sub {foreach (sort keys %_)  {print "$_ $_{$_} "}};
490%{"@_"} = %_ = (Just => another => Perl => Hacker); &{%{%_}};
491SKIP: Hashes are now randomized.
492EXPECT: $JaPH_s
493
494#######  Split 2
495$" = "/"; split // => eval join "+" => 1 .. 7;
496*{"@_"} = sub {foreach (sort keys %_) {print "$_ $_{$_} "}};
497%_ = (Just => another => Perl => Hacker); &{%_};
498SKIP: Hashes are now randomized.
499EXPECT: $JaPH_s
500
501#######  Split 3
502$" = "/"; split $, => eval join "+" => 1 .. 7;
503*{"@_"} = sub  {foreach (sort keys %_) {print "$_ $_{$_} "}};
504%{"@_"} = %_ = (Just => another => Perl => Hacker); &{%{%_}};
505SKIP: Hashes are now randomized.
506EXPECT: $JaPH_s
507
508#######  Here documents 1
509$_ = "\x3C\x3C\x45\x4F\x54"; s/<<EOT/<<EOT/e; print;
510Just another Perl Hacker
511EOT
512
513#######  Here documents 2
514$_ = "\x3C\x3C\x45\x4F\x54";
515print if s/<<EOT/<<EOT/e;
516Just another Perl Hacker
517EOT
518
519#######  Here documents 3
520$_ = "\x3C\x3C\x45\x4F\x54" and s/<<EOT/<<EOT/e and print;
521Just another Perl Hacker
522EOT
523
524#######  Here documents 4
525$_ = "\x3C\x3C\x45\x4F\x54\n" and s/<<EOT/<<EOT/ee and print;
526"Just another Perl Hacker"
527EOT
528
529#######  Self modifying code 1
530$_ = "goto F.print chop;\n=rekcaH lreP rehtona tsuJ";F1:eval
531SWITCHES: -w
532
533#######  Overloaded constants 1
534BEGIN {$^H {q} = sub {pop and pop and print pop}; $^H = 2**4.2**12}
535"Just "; "another "; "Perl "; "Hacker";
536SKIP_OS: qnx
537
538#######  Overloaded constants 2
539BEGIN {$^H {q} = sub {$_ [1] =~ y/S-ZA-IK-O/q-tc-fe-m/d; $_ [1]}; $^H = 0x28100}
540print "Just another PYTHON hacker\n";
541EXPECT: $JaPh
542
543#######  Overloaded constants 3
544BEGIN {$^H {join "" => ("a" .. "z") [8, 13, 19, 4, 6, 4, 17]} = sub
545           {["", "Just ", "another ", "Perl ", "Hacker\n"] -> [shift]};
546       $^H = hex join "" => reverse map {int ($_ / 2)} 0 .. 4}
547print 1, 2, 3, 4;
548
549#######  Overloaded constants 4
550BEGIN {$^H {join "" => ("a" .. "z") [8, 13, 19, 4, 6, 4, 17]} = sub
551           {["", "Just ", "another ", "Perl ", "Hacker"] -> [shift]};
552       $^H = hex join "" => reverse map {int ($_ / 2)} 0 .. 4}
553print 1, 2, 3, 4, "\n";
554
555#######  Overloaded constants 5
556BEGIN {my $x = "Knuth heals rare project\n";
557       $^H {integer} = sub {my $y = shift; $_ = substr $x => $y & 0x1F, 1;
558       $y > 32 ? uc : lc}; $^H = hex join "" => 2, 1, 1, 0, 0}
559print 52,2,10,23,16,8,1,19,3,6,15,12,5,49,21,14,9,11,36,13,22,32,7,18,24;
560
561#######  v-strings 1
562print v74.117.115.116.32;
563print v97.110.111.116.104.101.114.32;
564print v80.101.114.108.32;
565print v72.97.99.107.101.114.10;
566
567#######  v-strings 2
568print 74.117.115.116.32;
569print 97.110.111.116.104.101.114.32;
570print 80.101.114.108.32;
571print 72.97.99.107.101.114.10;
572
573#######  v-strings 3
574print v74.117.115.116.32, v97.110.111.116.104.101.114.32,
575      v80.101.114.108.32, v72.97.99.107.101.114.10;
576
577#######  v-strings 4
578print 74.117.115.116.32, 97.110.111.116.104.101.114.32,
579      80.101.114.108.32, 72.97.99.107.101.114.10;
580
581#######  v-strings 5
582print v74.117.115.116.32.97.110.111.116.104.101.114.
583      v32.80.101.114.108.32.72.97.99.107.101.114.10;
584
585#######  v-strings 6
586print 74.117.115.116.32.97.110.111.116.104.101.114.
587      32.80.101.114.108.32.72.97.99.107.101.114.10;
588
589#######  Symbolic references.
590map{${+chr}=chr}map{$_=>$_^ord$"}$=+$]..3*$=/2;
591print "$J$u$s$t $a$n$o$t$h$e$r $P$e$r$l $H$a$c$k$e$r\n";
592
593#######  $; fun
594$;                                   # A lone dollar?
595=$";                                 # Pod?
596$;                                   # The return of the lone dollar?
597{Just=>another=>Perl=>Hacker=>}      # Bare block?
598=$/;                                 # More pod?
599print%;                              # No right operand for %?
600
601#######  @; fun
602@;=split//=>"Joel, Preach sartre knuth\n";$;=chr 65;%;=map{$;++=>$_}
6030,22,13,16,5,14,21,1,23,11,2,7,12,6,8,15,3,19,24,14,10,20,18,17,4,25
604;print@;[@;{A..Z}];
605EXPECT: $JaPh_c
606
607#######  %; fun
608$;=$";$;{Just=>another=>Perl=>Hacker=>}=$/;print%;
609
610####### &func;
611$_ = "\112\165\163\1648\141\156\157\164\150\145\1628\120\145"
612   . "\162\1548\110\141\143\153\145\162\0128\177"  and &japh;
613sub japh {print "@_" and return if pop; split /\d/ and &japh}
614
615####### magic goto.
616sub _ {$_ = shift and y/b-yB-Y/a-yB-Y/                xor      !@ _?
617       exit print                                                  :
618            print and push @_ => shift and goto &{(caller (0)) [3]}}
619            split // => "KsvQtbuf fbsodpmu\ni flsI "  xor       & _
620
621####### $: fun 1
622:$:=~s:$":Just$&another$&:;$:=~s:
623:Perl$"Hacker$&:;chop$:;print$:#:
624
625####### $: fun 2
626 :;$:=~s:
627-:;another Perl Hacker
628 :;chop
629$:;$:=~y
630 :;::d;print+Just.
631$:;
632
633####### $: fun 3
634 :;$:=~s:
635-:;another Perl Hacker
636 :;chop
637$:;$:=~y:;::d;print+Just.$:
638
639####### $!
640s[$,][join$,,(split$,,($!=85))[(q[0006143730380126152532042307].
641q[41342211132019313505])=~m[..]g]]e and y[yIbp][HJkP] and print;
642SKIP: Platform dependent.
643
644####### die 1
645eval {die ["Just another Perl Hacker"]}; print ${$@}[$#{@${@}}]
646
647####### die 2
648eval {die ["Just another Perl Hacker\n"]}; print ${$@}[$#{@${@}}]
649
650####### die 3
651eval {die ["Just another Perl Hacker"]}; print ${${@}}[$#{@{${@}}}]
652
653####### die 4
654eval {die ["Just another Perl Hacker\n"]}; print ${${@}}[$#{@{${@}}}]
655
656####### die 5
657eval {die [[qq [Just another Perl Hacker]]]};; print
658${${${@}}[$#{@{${@}}}]}[$#{${@{${@}}}[$#{@{${@}}}]}]
659
660####### Closure returning itself.
661$_ = "\nrekcaH lreP rehtona tsuJ"; my $chop; $chop = sub {print chop; $chop};
662$chop -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> ()
663-> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> ()
664
665####### Special blocks 1
666BEGIN {print "Just "   }
667CHECK {print "another "}
668INIT  {print "Perl "   }
669END   {print "Hacker\n"}
670
671####### Special blocks 2
672END   {print "Hacker\n"}
673INIT  {print "Perl "   }
674CHECK {print "another "}
675BEGIN {print "Just "   }
676
677####### Recursive regex.
678   my $qr =  qr/^.+?(;).+?\1|;Just another Perl Hacker;|;.+$/;
679      $qr =~  s/$qr//g;
680print $qr, "\n";
681
682####### use lib 'coderef'
683use   lib sub {($\) = split /\./ => pop; print $"};
684eval "use Just" || eval "use another" || eval "use Perl" || eval "use Hacker";
685EXPECT
686 Just another Perl Hacker
687