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1#!./perl -w
2
3#
4# Tests derived from Japhs.
5#
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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
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16# is unfortunately not a trivial task.
17#
18# WARNING: these tests are obfuscated. Do not get frustrated.
cb5780fe 19# Ask Abigail <abigail@foad.org>, or use the Deparse or Concise
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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
5a6f1faa 24#
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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
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37skip_all "Unhappy on MacOS" if $^O eq 'MacOS';
38
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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;
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45 my $n = @_ ? shift : 1;
46 for (1..$n) {
51bdca1b 47 my $test = curr_test;
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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') {
51bdca1b 104 skip "Your platform quotes differently.", 3;
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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') {
51bdca1b 132 skip "Your platform quotes differently.", 1;
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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;
dc459aad 145 END {unlink_all $datafile if $datafile}
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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};
51bdca1b 194 skip $program -> {SKIP}, 1;
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195 next;
196 }
197
760807ca 198 chomp @{$program -> {SKIP_OS}};
51bdca1b 199 if (@{$program -> {SKIP_OS}}) {
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200 if (grep {$^O eq $_} @{$program -> {SKIP_OS}}) {
201 skip "Your OS uses different quoting.", 1;
202 next;
203 }
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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;
dc459aad 225 END {unlink_all $progfile if $progfile}
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226
227 my @programs = (<< ' --', << ' --');
4e508696 228#!./perl
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229BEGIN{$|=$SIG{__WARN__}=sub{$_=$_[0];y-_- -;print/(.)"$/;seek _,-open(_
230,"+<$0"),2;truncate _,tell _;close _;exec$0}}//rekcaH_lreP_rehtona_tsuJ
231 --
4e508696 232#!./perl
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233BEGIN{$SIG{__WARN__}=sub{$_=pop;y-_- -;print/".*(.)"/;
234truncate$0,-1+-s$0;exec$0;}}//rekcaH_lreP_rehtona_tsuJ
235 --
236 chomp @programs;
237
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238 if ($^O eq 'VMS') {
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 "VMS", 2 * @programs;
243 last
244 }
245
246 use Config;
247 unless (defined $Config {useperlio}) {
248 skip "Uuseperlio", 2 * @programs;
249 last
250 }
251
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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';
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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`;
6990bd83 266
760807ca 267 is ($output, $JaPH, "Self correcting code $i");
6990bd83 268
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269 $output = `$command`;
270 is ($output, "", "Self corrected code $i");
271 }
272 $i ++;
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273 }
274}
275
276__END__
277####### Funky loop 1.
278$_ = 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$& and q
286qq}*excess********}
760807ca 287SKIP_OS: qnx
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288
289####### Funky loop 3.
290$_ = q *4a75737420616e6f74686572205065726c204861636b65720a*;
291for ($*=******;$**=******;$**=******) {$**=*******s*..*qq}
292print chr 0x$& and q
293qq}*excess********}
760807ca 294SKIP_OS: qnx
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295
296####### Funky loop 4.
297$_ = 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: $datafile
414EXPECT: 6
415
416####### Abusing -M
4171
418SWITCHES
419-Mstrict='}); print "Just another Perl Hacker"; ({'
420-l
421SKIP_OS: VMS
422MSWin32
423NetWare
424
425####### rand
426srand 123456;$-=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" {};
480
481####### Prototype fun 3
482sub _ "Just another Perl Hacker"; print prototype \&_
483
484####### Split 1
485 split // => '"';
486${"@_"} = "/"; split // => eval join "+" => 1 .. 7;
487*{"@_"} = sub {foreach (sort keys %_) {print "$_ $_{$_} "}};
488%{"@_"} = %_ = (Just => another => Perl => Hacker); &{%{%_}};
489EXPECT: $JaPH_s
490
491####### Split 2
492$" = "/"; split // => eval join "+" => 1 .. 7;
493*{"@_"} = sub {foreach (sort keys %_) {print "$_ $_{$_} "}};
494%_ = (Just => another => Perl => Hacker); &{%_};
495EXPECT: $JaPH_s
496
497####### Split 3
498$" = "/"; split $, => eval join "+" => 1 .. 7;
499*{"@_"} = sub {foreach (sort keys %_) {print "$_ $_{$_} "}};
500%{"@_"} = %_ = (Just => another => Perl => Hacker); &{%{%_}};
501EXPECT: $JaPH_s
502
503####### Here documents 1
504$_ = "\x3C\x3C\x45\x4F\x54"; s/<<EOT/<<EOT/e; print;
505Just another Perl Hacker
506EOT
507
508####### Here documents 2
509$_ = "\x3C\x3C\x45\x4F\x54";
510print if s/<<EOT/<<EOT/e;
511Just another Perl Hacker
512EOT
513
514####### Here documents 3
515$_ = "\x3C\x3C\x45\x4F\x54" and s/<<EOT/<<EOT/e and print;
516Just another Perl Hacker
517EOT
518
519####### Here documents 4
520$_ = "\x3C\x3C\x45\x4F\x54\n" and s/<<EOT/<<EOT/ee and print;
521"Just another Perl Hacker"
522EOT
523
524####### Self modifying code 1
525$_ = "goto F.print chop;\n=rekcaH lreP rehtona tsuJ";F1:eval
526SWITCHES: -w
527
528####### Overloaded constants 1
529BEGIN {$^H {q} = sub {pop and pop and print pop}; $^H = 2**4.2**12}
530"Just "; "another "; "Perl "; "Hacker";
760807ca 531SKIP_OS: qnx
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532
533####### Overloaded constants 2
534BEGIN {$^H {q} = sub {$_ [1] =~ y/S-ZA-IK-O/q-tc-fe-m/d; $_ [1]}; $^H = 0x28100}
535print "Just another PYTHON hacker\n";
536EXPECT: $JaPh
537
538####### Overloaded constants 3
539BEGIN {$^H {join "" => ("a" .. "z") [8, 13, 19, 4, 6, 4, 17]} = sub
540 {["", "Just ", "another ", "Perl ", "Hacker\n"] -> [shift]};
541 $^H = hex join "" => reverse map {int ($_ / 2)} 0 .. 4}
542print 1, 2, 3, 4;
543
544####### Overloaded constants 4
545BEGIN {$^H {join "" => ("a" .. "z") [8, 13, 19, 4, 6, 4, 17]} = sub
546 {["", "Just ", "another ", "Perl ", "Hacker"] -> [shift]};
547 $^H = hex join "" => reverse map {int ($_ / 2)} 0 .. 4}
548print 1, 2, 3, 4, "\n";
549
550####### Overloaded constants 5
551BEGIN {my $x = "Knuth heals rare project\n";
552 $^H {integer} = sub {my $y = shift; $_ = substr $x => $y & 0x1F, 1;
553 $y > 32 ? uc : lc}; $^H = hex join "" => 2, 1, 1, 0, 0}
554print 52,2,10,23,16,8,1,19,3,6,15,12,5,49,21,14,9,11,36,13,22,32,7,18,24;
555
556####### v-strings 1
557print v74.117.115.116.32;
558print v97.110.111.116.104.101.114.32;
559print v80.101.114.108.32;
560print v72.97.99.107.101.114.10;
561
562####### v-strings 2
563print 74.117.115.116.32;
564print 97.110.111.116.104.101.114.32;
565print 80.101.114.108.32;
566print 72.97.99.107.101.114.10;
567
568####### v-strings 3
569print v74.117.115.116.32, v97.110.111.116.104.101.114.32,
570 v80.101.114.108.32, v72.97.99.107.101.114.10;
571
572####### v-strings 4
573print 74.117.115.116.32, 97.110.111.116.104.101.114.32,
574 80.101.114.108.32, 72.97.99.107.101.114.10;
575
576####### v-strings 5
577print v74.117.115.116.32.97.110.111.116.104.101.114.
578 v32.80.101.114.108.32.72.97.99.107.101.114.10;
579
580####### v-strings 6
581print 74.117.115.116.32.97.110.111.116.104.101.114.
582 32.80.101.114.108.32.72.97.99.107.101.114.10;
583
584####### Symbolic references.
585map{${+chr}=chr}map{$_=>$_^ord$"}$=+$]..3*$=/2;
586print "$J$u$s$t $a$n$o$t$h$e$r $P$e$r$l $H$a$c$k$e$r\n";
587
588####### $; fun
589$; # A lone dollar?
590=$"; # Pod?
591$; # The return of the lone dollar?
592{Just=>another=>Perl=>Hacker=>} # Bare block?
593=$/; # More pod?
594print%; # No right operand for %?
595
596####### @; fun
597@;=split//=>"Joel, Preach sartre knuth\n";$;=chr 65;%;=map{$;++=>$_}
5980,22,13,16,5,14,21,1,23,11,2,7,12,6,8,15,3,19,24,14,10,20,18,17,4,25
599;print@;[@;{A..Z}];
600EXPECT: $JaPh_c
601
602####### %; fun
603$;=$";$;{Just=>another=>Perl=>Hacker=>}=$/;print%;
604
605####### &func;
606$_ = "\112\165\163\1648\141\156\157\164\150\145\1628\120\145"
607 . "\162\1548\110\141\143\153\145\162\0128\177" and &japh;
608sub japh {print "@_" and return if pop; split /\d/ and &japh}
609
610####### magic goto.
611sub _ {$_ = shift and y/b-yB-Y/a-yB-Y/ xor !@ _?
612 exit print :
613 print and push @_ => shift and goto &{(caller (0)) [3]}}
614 split // => "KsvQtbuf fbsodpmu\ni flsI " xor & _
615
616####### $: fun 1
617:$:=~s:$":Just$&another$&:;$:=~s:
618:Perl$"Hacker$&:;chop$:;print$:#:
619
620####### $: fun 2
621 :;$:=~s:
622-:;another Perl Hacker
623 :;chop
624$:;$:=~y
625 :;::d;print+Just.
626$:;
627
628####### $: fun 3
629 :;$:=~s:
630-:;another Perl Hacker
631 :;chop
632$:;$:=~y:;::d;print+Just.$:
633
634####### $!
635s[$,][join$,,(split$,,($!=85))[(q[0006143730380126152532042307].
636q[41342211132019313505])=~m[..]g]]e and y[yIbp][HJkP] and print;
637SKIP: Platform dependent.
638
639####### die 1
640eval {die ["Just another Perl Hacker"]}; print ${$@}[$#{@${@}}]
641
642####### die 2
643eval {die ["Just another Perl Hacker\n"]}; print ${$@}[$#{@${@}}]
644
645####### die 3
646eval {die ["Just another Perl Hacker"]}; print ${${@}}[$#{@{${@}}}]
647
648####### die 4
649eval {die ["Just another Perl Hacker\n"]}; print ${${@}}[$#{@{${@}}}]
650
651####### die 5
652eval {die [[qq [Just another Perl Hacker]]]};; print
653${${${@}}[$#{@{${@}}}]}[$#{${@{${@}}}[$#{@{${@}}}]}]
654
655####### Closure returning itself.
656$_ = "\nrekcaH lreP rehtona tsuJ"; my $chop; $chop = sub {print chop; $chop};
657$chop -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> ()
658-> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> () -> ()
659
660####### Special blocks 1
661BEGIN {print "Just " }
662CHECK {print "another "}
663INIT {print "Perl " }
664END {print "Hacker\n"}
665
666####### Special blocks 2
667END {print "Hacker\n"}
668INIT {print "Perl " }
669CHECK {print "another "}
670BEGIN {print "Just " }
671
672####### Recursive regex.
673 my $qr = qr/^.+?(;).+?\1|;Just another Perl Hacker;|;.+$/;
674 $qr =~ s/$qr//g;
675print $qr, "\n";
676
677####### use lib 'coderef'
678use lib sub {($\) = split /\./ => pop; print $"};
679eval "use Just" || eval "use another" || eval "use Perl" || eval "use Hacker";
680EXPECT
681 Just another Perl Hacker