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Merge branch 'memleaktest' into blead
[perl5.git] / t / op / sort.t
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1#!./perl
2
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3BEGIN {
4 chdir 't' if -d 't';
f34362ee 5 @INC = qw(. ../lib); require 'test.pl';
9c007264 6}
9f1b1f2d 7use warnings;
f34362ee 8plan( tests => 143 );
a687059c 9
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10# these shouldn't hang
11{
12 no warnings;
13 sort { for ($_ = 0;; $_++) {} } @a;
14 sort { while(1) {} } @a;
15 sort { while(1) { last; } } @a;
16 sort { while(0) { last; } } @a;
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17
18 # Change 26011: Re: A surprising segfault
19 map scalar(sort(+())), ('')x68;
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20}
21
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22sub Backwards { $a lt $b ? 1 : $a gt $b ? -1 : 0 }
23sub Backwards_stacked($$) { my($a,$b) = @_; $a lt $b ? 1 : $a gt $b ? -1 : 0 }
9850bf21 24sub Backwards_other { $a lt $b ? 1 : $a gt $b ? -1 : 0 }
a687059c 25
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26my $upperfirst = 'A' lt 'a';
27
28# Beware: in future this may become hairier because of possible
59608b94 29# collation complications: qw(A a B b) can be sorted at least as
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30# any of the following
31#
32# A a B b
33# A B a b
34# a b A B
35# a A b B
36#
37# All the above orders make sense.
38#
39# That said, EBCDIC sorts all small letters first, as opposed
40# to ASCII which sorts all big letters first.
41
a687059c 42@harry = ('dog','cat','x','Cain','Abel');
2f52a358 43@george = ('gone','chased','yz','punished','Axed');
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44
45$x = join('', sort @harry);
9d116dd7 46$expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
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47
48cmp_ok($x,'eq',$expected,'upper first 1');
a687059c 49
9f1b1f2d 50$x = join('', sort( Backwards @harry));
9d116dd7 51$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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52
53cmp_ok($x,'eq',$expected,'upper first 2');
a687059c 54
9f1b1f2d 55$x = join('', sort( Backwards_stacked @harry));
43481408 56$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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57
58cmp_ok($x,'eq',$expected,'upper first 3');
43481408 59
a687059c 60$x = join('', sort @george, 'to', @harry);
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61$expected = $upperfirst ?
62 'AbelAxedCaincatchaseddoggonepunishedtoxyz' :
63 'catchaseddoggonepunishedtoxyzAbelAxedCain' ;
03a14243 64
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65cmp_ok($x,'eq',$expected,'upper first 4');
66$" = ' ';
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67@a = ();
68@b = reverse @a;
f34362ee 69cmp_ok("@b",'eq',"",'reverse 1');
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70
71@a = (1);
72@b = reverse @a;
f34362ee 73cmp_ok("@b",'eq',"1",'reverse 2');
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74
75@a = (1,2);
76@b = reverse @a;
f34362ee 77cmp_ok("@b",'eq',"2 1",'reverse 3');
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78
79@a = (1,2,3);
80@b = reverse @a;
f34362ee 81cmp_ok("@b",'eq',"3 2 1",'reverse 4');
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82
83@a = (1,2,3,4);
84@b = reverse @a;
f34362ee 85cmp_ok("@b",'eq',"4 3 2 1",'reverse 5');
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86
87@a = (10,2,3,4);
88@b = sort {$a <=> $b;} @a;
f34362ee 89cmp_ok("@b",'eq',"2 3 4 10",'sort numeric');
988174c1 90
9f1b1f2d 91$sub = 'Backwards';
988174c1 92$x = join('', sort $sub @harry);
9d116dd7 93$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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94
95cmp_ok($x,'eq',$expected,'sorter sub name in var 1');
43481408 96
9f1b1f2d 97$sub = 'Backwards_stacked';
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98$x = join('', sort $sub @harry);
99$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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100
101cmp_ok($x,'eq',$expected,'sorter sub name in var 2');
988174c1 102
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103# literals, combinations
104
105@b = sort (4,1,3,2);
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106cmp_ok("@b",'eq','1 2 3 4','just sort');
107
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108
109@b = sort grep { $_ } (4,1,3,2);
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110cmp_ok("@b",'eq','1 2 3 4','grep then sort');
111
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112
113@b = sort map { $_ } (4,1,3,2);
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114cmp_ok("@b",'eq','1 2 3 4','map then sort');
115
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116
117@b = sort reverse (4,1,3,2);
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118cmp_ok("@b",'eq','1 2 3 4','reverse then sort');
119
120
7bac28a0 121
9850bf21 122sub twoface { no warnings 'redefine'; *twoface = sub { $a <=> $b }; &twoface }
7bac28a0 123eval { @b = sort twoface 4,1,3,2 };
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124cmp_ok("@b",'eq','1 2 3 4','redefine sort sub inside the sort sub');
125
7bac28a0 126
9f1b1f2d 127eval { no warnings 'redefine'; *twoface = sub { &Backwards } };
f34362ee 128ok(!$@,"redefining sort subs outside the sort \$@=[$@]");
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129
130eval { @b = sort twoface 4,1,3,2 };
f34362ee 131cmp_ok("@b",'eq','4 3 2 1','twoface redefinition');
7bac28a0 132
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133{
134 no warnings 'redefine';
9850bf21 135 *twoface = sub { *twoface = *Backwards_other; $a <=> $b };
9f1b1f2d 136}
f34362ee 137
9850bf21 138eval { @b = sort twoface 4,1,9,5 };
f34362ee 139ok(($@ eq "" && "@b" eq "1 4 5 9"),'redefinition should not take effect during the sort');
7bac28a0 140
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141{
142 no warnings 'redefine';
143 *twoface = sub {
7bac28a0 144 eval 'sub twoface { $a <=> $b }';
f34362ee 145 die($@ eq "" ? "good\n" : "bad\n");
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146 $a <=> $b;
147 };
9f1b1f2d 148}
7bac28a0 149eval { @b = sort twoface 4,1 };
f34362ee 150cmp_ok(substr($@,0,4), 'eq', 'good', 'twoface eval');
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151
152eval <<'CODE';
9f1b1f2d 153 my @result = sort main'Backwards 'one', 'two';
15f0808c 154CODE
f34362ee 155cmp_ok($@,'eq','',q(old skool package));
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156
157eval <<'CODE';
158 # "sort 'one', 'two'" should not try to parse "'one" as a sort sub
159 my @result = sort 'one', 'two';
160CODE
f34362ee 161cmp_ok($@,'eq','',q(one is not a sub));
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162
163{
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164 my $sortsub = \&Backwards;
165 my $sortglob = *Backwards;
166 my $sortglobr = \*Backwards;
167 my $sortname = 'Backwards';
c6e96bcb 168 @b = sort $sortsub 4,1,3,2;
f34362ee 169 cmp_ok("@b",'eq','4 3 2 1','sortname 1');
c6e96bcb 170 @b = sort $sortglob 4,1,3,2;
f34362ee 171 cmp_ok("@b",'eq','4 3 2 1','sortname 2');
c6e96bcb 172 @b = sort $sortname 4,1,3,2;
f34362ee 173 cmp_ok("@b",'eq','4 3 2 1','sortname 3');
62f274bf 174 @b = sort $sortglobr 4,1,3,2;
f34362ee 175 cmp_ok("@b",'eq','4 3 2 1','sortname 4');
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176}
177
178{
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179 my $sortsub = \&Backwards_stacked;
180 my $sortglob = *Backwards_stacked;
181 my $sortglobr = \*Backwards_stacked;
182 my $sortname = 'Backwards_stacked';
43481408 183 @b = sort $sortsub 4,1,3,2;
f34362ee 184 cmp_ok("@b",'eq','4 3 2 1','sortname 5');
43481408 185 @b = sort $sortglob 4,1,3,2;
f34362ee 186 cmp_ok("@b",'eq','4 3 2 1','sortname 6');
43481408 187 @b = sort $sortname 4,1,3,2;
f34362ee 188 cmp_ok("@b",'eq','4 3 2 1','sortname 7');
43481408 189 @b = sort $sortglobr 4,1,3,2;
f34362ee 190 cmp_ok("@b",'eq','4 3 2 1','sortname 8');
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191}
192
193{
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194 local $sortsub = \&Backwards;
195 local $sortglob = *Backwards;
196 local $sortglobr = \*Backwards;
197 local $sortname = 'Backwards';
c6e96bcb 198 @b = sort $sortsub 4,1,3,2;
f34362ee 199 cmp_ok("@b",'eq','4 3 2 1','sortname local 1');
c6e96bcb 200 @b = sort $sortglob 4,1,3,2;
f34362ee 201 cmp_ok("@b",'eq','4 3 2 1','sortname local 2');
c6e96bcb 202 @b = sort $sortname 4,1,3,2;
f34362ee 203 cmp_ok("@b",'eq','4 3 2 1','sortname local 3');
62f274bf 204 @b = sort $sortglobr 4,1,3,2;
f34362ee 205 cmp_ok("@b",'eq','4 3 2 1','sortname local 4');
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206}
207
208{
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209 local $sortsub = \&Backwards_stacked;
210 local $sortglob = *Backwards_stacked;
211 local $sortglobr = \*Backwards_stacked;
212 local $sortname = 'Backwards_stacked';
43481408 213 @b = sort $sortsub 4,1,3,2;
f34362ee 214 cmp_ok("@b",'eq','4 3 2 1','sortname local 5');
43481408 215 @b = sort $sortglob 4,1,3,2;
f34362ee 216 cmp_ok("@b",'eq','4 3 2 1','sortname local 6');
43481408 217 @b = sort $sortname 4,1,3,2;
f34362ee 218 cmp_ok("@b",'eq','4 3 2 1','sortname local 7');
43481408 219 @b = sort $sortglobr 4,1,3,2;
f34362ee 220 cmp_ok("@b",'eq','4 3 2 1','sortname local 8');
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221}
222
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223## exercise sort builtins... ($a <=> $b already tested)
224@a = ( 5, 19, 1996, 255, 90 );
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225@b = sort {
226 my $dummy; # force blockness
227 return $b <=> $a
228} @a;
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229cmp_ok("@b",'eq','1996 255 90 19 5','force blockness');
230
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231$x = join('', sort { $a cmp $b } @harry);
232$expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
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233cmp_ok($x,'eq',$expected,'a cmp b');
234
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235$x = join('', sort { $b cmp $a } @harry);
236$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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237cmp_ok($x,'eq',$expected,'b cmp a');
238
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239{
240 use integer;
241 @b = sort { $a <=> $b } @a;
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242 cmp_ok("@b",'eq','5 19 90 255 1996','integer a <=> b');
243
9c007264 244 @b = sort { $b <=> $a } @a;
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245 cmp_ok("@b",'eq','1996 255 90 19 5','integer b <=> a');
246
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247 $x = join('', sort { $a cmp $b } @harry);
248 $expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
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249 cmp_ok($x,'eq',$expected,'integer a cmp b');
250
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251 $x = join('', sort { $b cmp $a } @harry);
252 $expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
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253 cmp_ok($x,'eq',$expected,'integer b cmp a');
254
9c007264 255}
e507f050 256
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257
258
e507f050 259$x = join('', sort { $a <=> $b } 3, 1, 2);
f34362ee 260cmp_ok($x,'eq','123',q(optimized-away comparison block doesn't take any other arguments away with it));
e507f050 261
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262# test sorting in non-main package
263package Foo;
264@a = ( 5, 19, 1996, 255, 90 );
265@b = sort { $b <=> $a } @a;
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266main::cmp_ok("@b",'eq','1996 255 90 19 5','not in main:: 1');
267
43481408 268
9f1b1f2d 269@b = sort main::Backwards_stacked @a;
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270main::cmp_ok("@b",'eq','90 5 255 1996 19','not in main:: 2');
271
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272
273# check if context for sort arguments is handled right
274
f34362ee 275
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276sub test_if_list {
277 my $gimme = wantarray;
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278 main::is($gimme,1,'wantarray 1');
279
280
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281}
282my $m = sub { $a <=> $b };
283
284sub cxt_one { sort $m test_if_list() }
285cxt_one();
286sub cxt_two { sort { $a <=> $b } test_if_list() }
287cxt_two();
288sub cxt_three { sort &test_if_list() }
289cxt_three();
290
291sub test_if_scalar {
292 my $gimme = wantarray;
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293 main::is(!($gimme or !defined($gimme)),1,'wantarray 2');
294
295
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296}
297
298$m = \&test_if_scalar;
299sub cxt_four { sort $m 1,2 }
300@x = cxt_four();
301sub cxt_five { sort { test_if_scalar($a,$b); } 1,2 }
302@x = cxt_five();
303sub cxt_six { sort test_if_scalar 1,2 }
304@x = cxt_six();
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305
306# test against a reentrancy bug
307{
308 package Bar;
309 sub compare { $a cmp $b }
310 sub reenter { my @force = sort compare qw/a b/ }
311}
312{
313 my($def, $init) = (0, 0);
314 @b = sort {
315 $def = 1 if defined $Bar::a;
316 Bar::reenter() unless $init++;
317 $a <=> $b
318 } qw/4 3 1 2/;
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319 main::cmp_ok("@b",'eq','1 2 3 4','reenter 1');
320
321 main::ok(!$def,'reenter 2');
8e664e10 322}
f0670693 323
f34362ee 324
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325{
326 sub routine { "one", "two" };
327 @a = sort(routine(1));
f34362ee 328 main::cmp_ok("@a",'eq',"one two",'bug id 19991001.003');
f0670693 329}
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330
331
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332#my $test = 59;
333sub ok { main::cmp_ok($_[0],'eq',$_[1],$_[2]);
334# print "not " unless $_[0] eq $_[1];
335# print "ok $test - $_[2]\n";
336# print "#[$_[0]] ne [$_[1]]\n" unless $_[0] eq $_[1];
337# $test++;
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338}
339
340# check for in-place optimisation of @a = sort @a
341{
342 my ($r1,$r2,@a);
343 our @g;
344 @g = (3,2,1); $r1 = \$g[2]; @g = sort @g; $r2 = \$g[0];
345 ok "$r1-@g", "$r2-1 2 3", "inplace sort of global";
346
347 @a = qw(b a c); $r1 = \$a[1]; @a = sort @a; $r2 = \$a[0];
348 ok "$r1-@a", "$r2-a b c", "inplace sort of lexical";
349
350 @g = (2,3,1); $r1 = \$g[1]; @g = sort { $b <=> $a } @g; $r2 = \$g[0];
351 ok "$r1-@g", "$r2-3 2 1", "inplace reversed sort of global";
352
353 @g = (2,3,1);
354 $r1 = \$g[1]; @g = sort { $a<$b?1:$a>$b?-1:0 } @g; $r2 = \$g[0];
355 ok "$r1-@g", "$r2-3 2 1", "inplace custom sort of global";
356
357 sub mysort { $b cmp $a };
358 @a = qw(b c a); $r1 = \$a[1]; @a = sort mysort @a; $r2 = \$a[0];
359 ok "$r1-@a", "$r2-c b a", "inplace sort with function of lexical";
360
361 use Tie::Array;
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362 my @t;
363 tie @t, 'Tie::StdArray';
fe1bc4cf 364
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365 @t = qw(b c a); @t = sort @t;
366 ok "@t", "a b c", "inplace sort of tied array";
fe1bc4cf 367
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368 @t = qw(b c a); @t = sort mysort @t;
369 ok "@t", "c b a", "inplace sort of tied array with function";
370
371 # [perl #29790] don't optimise @a = ('a', sort @a) !
372
373 @g = (3,2,1); @g = ('0', sort @g);
374 ok "@g", "0 1 2 3", "un-inplace sort of global";
375 @g = (3,2,1); @g = (sort(@g),'4');
376 ok "@g", "1 2 3 4", "un-inplace sort of global 2";
377
378 @a = qw(b a c); @a = ('x', sort @a);
379 ok "@a", "x a b c", "un-inplace sort of lexical";
380 @a = qw(b a c); @a = ((sort @a), 'x');
381 ok "@a", "a b c x", "un-inplace sort of lexical 2";
382
383 @g = (2,3,1); @g = ('0', sort { $b <=> $a } @g);
384 ok "@g", "0 3 2 1", "un-inplace reversed sort of global";
385 @g = (2,3,1); @g = ((sort { $b <=> $a } @g),'4');
386 ok "@g", "3 2 1 4", "un-inplace reversed sort of global 2";
387
388 @g = (2,3,1); @g = ('0', sort { $a<$b?1:$a>$b?-1:0 } @g);
389 ok "@g", "0 3 2 1", "un-inplace custom sort of global";
390 @g = (2,3,1); @g = ((sort { $a<$b?1:$a>$b?-1:0 } @g),'4');
391 ok "@g", "3 2 1 4", "un-inplace custom sort of global 2";
392
393 @a = qw(b c a); @a = ('x', sort mysort @a);
394 ok "@a", "x c b a", "un-inplace sort with function of lexical";
395 @a = qw(b c a); @a = ((sort mysort @a),'x');
396 ok "@a", "c b a x", "un-inplace sort with function of lexical 2";
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397}
398
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399# Test optimisations of reversed sorts. As we now guarantee stability by
400# default, # optimisations which do not provide this are bogus.
fe1bc4cf 401
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402{
403 package Oscalar;
404 use overload (qw("" stringify 0+ numify fallback 1));
405
406 sub new {
407 bless [$_[1], $_[2]], $_[0];
408 }
409
410 sub stringify { $_[0]->[0] }
411
412 sub numify { $_[0]->[1] }
413}
414
415sub generate {
416 my $count = 0;
417 map {new Oscalar $_, $count++} qw(A A A B B B C C C);
418}
419
420my @input = &generate;
421my @output = sort @input;
422ok join(" ", map {0+$_} @output), "0 1 2 3 4 5 6 7 8", "Simple stable sort";
423
424@input = &generate;
425@input = sort @input;
426ok join(" ", map {0+$_} @input), "0 1 2 3 4 5 6 7 8",
427 "Simple stable in place sort";
428
429# This won't be very interesting
430@input = &generate;
431@output = sort {$a <=> $b} @input;
432ok "@output", "A A A B B B C C C", 'stable $a <=> $b sort';
433
434@input = &generate;
435@output = sort {$a cmp $b} @input;
436ok join(" ", map {0+$_} @output), "0 1 2 3 4 5 6 7 8", 'stable $a cmp $b sort';
437
438@input = &generate;
439@input = sort {$a cmp $b} @input;
440ok join(" ", map {0+$_} @input), "0 1 2 3 4 5 6 7 8",
441 'stable $a cmp $b in place sort';
442
443@input = &generate;
444@output = sort {$b cmp $a} @input;
445ok join(" ", map {0+$_} @output), "6 7 8 3 4 5 0 1 2", 'stable $b cmp $a sort';
446
447@input = &generate;
448@input = sort {$b cmp $a} @input;
449ok join(" ", map {0+$_} @input), "6 7 8 3 4 5 0 1 2",
450 'stable $b cmp $a in place sort';
451
75dd5fa4 452@input = &generate;
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453@output = reverse sort @input;
454ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0", "Reversed stable sort";
455
456@input = &generate;
457@input = reverse sort @input;
458ok join(" ", map {0+$_} @input), "8 7 6 5 4 3 2 1 0",
459 "Reversed stable in place sort";
460
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461@input = &generate;
462my $output = reverse sort @input;
463ok $output, "CCCBBBAAA", "Reversed stable sort in scalar context";
464
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465
466@input = &generate;
467@output = reverse sort {$a cmp $b} @input;
468ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0",
469 'reversed stable $a cmp $b sort';
470
471@input = &generate;
472@input = reverse sort {$a cmp $b} @input;
473ok join(" ", map {0+$_} @input), "8 7 6 5 4 3 2 1 0",
474 'revesed stable $a cmp $b in place sort';
475
476@input = &generate;
7e7a548e 477$output = reverse sort {$a cmp $b} @input;
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478ok $output, "CCCBBBAAA", 'Reversed stable $a cmp $b sort in scalar context';
479
480@input = &generate;
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481@output = reverse sort {$b cmp $a} @input;
482ok join(" ", map {0+$_} @output), "2 1 0 5 4 3 8 7 6",
483 'reversed stable $b cmp $a sort';
484
485@input = &generate;
486@input = reverse sort {$b cmp $a} @input;
487ok join(" ", map {0+$_} @input), "2 1 0 5 4 3 8 7 6",
488 'revesed stable $b cmp $a in place sort';
489
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490@input = &generate;
491$output = reverse sort {$b cmp $a} @input;
492ok $output, "AAABBBCCC", 'Reversed stable $b cmp $a sort in scalar context';
493
7e7a548e
NC
494sub stuff {
495 # Something complex enough to defeat any constant folding optimiser
496 $$ - $$;
497}
498
499@input = &generate;
500@output = reverse sort {stuff || $a cmp $b} @input;
501ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0",
502 'reversed stable complex sort';
503
504@input = &generate;
505@input = reverse sort {stuff || $a cmp $b} @input;
506ok join(" ", map {0+$_} @input), "8 7 6 5 4 3 2 1 0",
507 'revesed stable complex in place sort';
508
509@input = &generate;
510$output = reverse sort {stuff || $a cmp $b } @input;
511ok $output, "CCCBBBAAA", 'Reversed stable complex sort in scalar context';
512
a1824f2a
NC
513sub sortr {
514 reverse sort @_;
515}
516
517@output = sortr &generate;
518ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0",
519 'reversed stable sort return list context';
520$output = sortr &generate;
521ok $output, "CCCBBBAAA",
522 'reversed stable sort return scalar context';
523
524sub sortcmpr {
525 reverse sort {$a cmp $b} @_;
526}
527
528@output = sortcmpr &generate;
529ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0",
530 'reversed stable $a cmp $b sort return list context';
531$output = sortcmpr &generate;
532ok $output, "CCCBBBAAA",
533 'reversed stable $a cmp $b sort return scalar context';
534
535sub sortcmprba {
536 reverse sort {$b cmp $a} @_;
537}
538
539@output = sortcmprba &generate;
540ok join(" ", map {0+$_} @output), "2 1 0 5 4 3 8 7 6",
541 'reversed stable $b cmp $a sort return list context';
542$output = sortcmprba &generate;
543ok $output, "AAABBBCCC",
544'reversed stable $b cmp $a sort return scalar context';
eb209983 545
7e7a548e
NC
546sub sortcmprq {
547 reverse sort {stuff || $a cmp $b} @_;
548}
549
550@output = sortcmpr &generate;
551ok join(" ", map {0+$_} @output), "8 7 6 5 4 3 2 1 0",
552 'reversed stable complex sort return list context';
553$output = sortcmpr &generate;
554ok $output, "CCCBBBAAA",
555 'reversed stable complex sort return scalar context';
556
eb209983
NC
557# And now with numbers
558
559sub generate1 {
560 my $count = 'A';
561 map {new Oscalar $count++, $_} 0, 0, 0, 1, 1, 1, 2, 2, 2;
562}
563
564# This won't be very interesting
565@input = &generate1;
566@output = sort {$a cmp $b} @input;
567ok "@output", "A B C D E F G H I", 'stable $a cmp $b sort';
568
569@input = &generate1;
570@output = sort {$a <=> $b} @input;
571ok "@output", "A B C D E F G H I", 'stable $a <=> $b sort';
572
573@input = &generate1;
574@input = sort {$a <=> $b} @input;
575ok "@input", "A B C D E F G H I", 'stable $a <=> $b in place sort';
576
577@input = &generate1;
578@output = sort {$b <=> $a} @input;
579ok "@output", "G H I D E F A B C", 'stable $b <=> $a sort';
580
581@input = &generate1;
582@input = sort {$b <=> $a} @input;
583ok "@input", "G H I D E F A B C", 'stable $b <=> $a in place sort';
584
59608b94
DN
585# test that optimized {$b cmp $a} and {$b <=> $a} remain stable
586# (new in 5.9) without overloading
587{ no warnings;
588@b = sort { $b <=> $a } @input = qw/5first 6first 5second 6second/;
589ok "@b" , "6first 6second 5first 5second", "optimized {$b <=> $a} without overloading" ;
590@input = sort {$b <=> $a} @input;
591ok "@input" , "6first 6second 5first 5second","inline optimized {$b <=> $a} without overloading" ;
592};
593
eb209983 594# These two are actually doing string cmp on 0 1 and 2
75dd5fa4 595@input = &generate1;
eb209983
NC
596@output = reverse sort @input;
597ok "@output", "I H G F E D C B A", "Reversed stable sort";
598
599@input = &generate1;
600@input = reverse sort @input;
601ok "@input", "I H G F E D C B A", "Reversed stable in place sort";
602
603@input = &generate1;
75dd5fa4
NC
604$output = reverse sort @input;
605ok $output, "IHGFEDCBA", "Reversed stable sort in scalar context";
606
607@input = &generate1;
eb209983
NC
608@output = reverse sort {$a <=> $b} @input;
609ok "@output", "I H G F E D C B A", 'reversed stable $a <=> $b sort';
610
611@input = &generate1;
612@input = reverse sort {$a <=> $b} @input;
613ok "@input", "I H G F E D C B A", 'revesed stable $a <=> $b in place sort';
fe1bc4cf 614
eb209983 615@input = &generate1;
75dd5fa4
NC
616$output = reverse sort {$a <=> $b} @input;
617ok $output, "IHGFEDCBA", 'reversed stable $a <=> $b sort in scalar context';
618
619@input = &generate1;
eb209983
NC
620@output = reverse sort {$b <=> $a} @input;
621ok "@output", "C B A F E D I H G", 'reversed stable $b <=> $a sort';
fe1bc4cf 622
eb209983
NC
623@input = &generate1;
624@input = reverse sort {$b <=> $a} @input;
625ok "@input", "C B A F E D I H G", 'revesed stable $b <=> $a in place sort';
75dd5fa4
NC
626
627@input = &generate1;
628$output = reverse sort {$b <=> $a} @input;
629ok $output, "CBAFEDIHG", 'reversed stable $b <=> $a sort in scalar context';
a1824f2a 630
7e7a548e
NC
631@input = &generate1;
632@output = reverse sort {stuff || $a <=> $b} @input;
633ok "@output", "I H G F E D C B A", 'reversed stable complex sort';
634
635@input = &generate1;
636@input = reverse sort {stuff || $a <=> $b} @input;
637ok "@input", "I H G F E D C B A", 'revesed stable complex in place sort';
638
639@input = &generate1;
640$output = reverse sort {stuff || $a <=> $b} @input;
641ok $output, "IHGFEDCBA", 'reversed stable complex sort in scalar context';
a1824f2a
NC
642
643sub sortnumr {
644 reverse sort {$a <=> $b} @_;
645}
646
647@output = sortnumr &generate1;
648ok "@output", "I H G F E D C B A",
649 'reversed stable $a <=> $b sort return list context';
650$output = sortnumr &generate1;
c093edd0 651ok $output, "IHGFEDCBA", 'reversed stable $a <=> $b sort return scalar context';
a1824f2a
NC
652
653sub sortnumrba {
654 reverse sort {$b <=> $a} @_;
655}
656
657@output = sortnumrba &generate1;
658ok "@output", "C B A F E D I H G",
659 'reversed stable $b <=> $a sort return list context';
660$output = sortnumrba &generate1;
c093edd0 661ok $output, "CBAFEDIHG", 'reversed stable $b <=> $a sort return scalar context';
7e7a548e
NC
662
663sub sortnumrq {
664 reverse sort {stuff || $a <=> $b} @_;
665}
666
667@output = sortnumrq &generate1;
668ok "@output", "I H G F E D C B A",
669 'reversed stable complex sort return list context';
670$output = sortnumrq &generate1;
c093edd0
NC
671ok $output, "IHGFEDCBA", 'reversed stable complex sort return scalar context';
672
673@output = reverse (sort(qw(C A B)), 0);
674ok "@output", "0 C B A", 'reversed sort with trailing argument';
675
676@output = reverse (0, sort(qw(C A B)));
677ok "@output", "C B A 0", 'reversed sort with leading argument';
9850bf21
RH
678
679eval { @output = sort {goto sub {}} 1,2; };
f34362ee
DL
680$fail_msg = q(Can't goto subroutine outside a subroutine);
681main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'goto subr outside subr');
682
683
9850bf21
RH
684
685sub goto_sub {goto sub{}}
686eval { @output = sort goto_sub 1,2; };
f34362ee
DL
687$fail_msg = q(Can't goto subroutine from a sort sub);
688main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'goto subr from a sort sub');
689
690
9850bf21
RH
691
692eval { @output = sort {goto label} 1,2; };
f34362ee
DL
693$fail_msg = q(Can't "goto" out of a pseudo block);
694main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'goto out of a pseudo block 1');
695
696
9850bf21
RH
697
698sub goto_label {goto label}
699label: eval { @output = sort goto_label 1,2; };
f34362ee
DL
700$fail_msg = q(Can't "goto" out of a pseudo block);
701main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'goto out of a pseudo block 2');
702
703
9850bf21
RH
704
705sub self_immolate {undef &self_immolate; $a<=>$b}
706eval { @output = sort self_immolate 1,2,3 };
f34362ee
DL
707$fail_msg = q(Can't undef active subroutine);
708main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'undef active subr');
709
710
9850bf21
RH
711
712{
713 my $failed = 0;
714
715 sub rec {
716 my $n = shift;
717 if (!defined($n)) { # No arg means we're being called by sort()
718 return 1;
719 }
720 if ($n<5) { rec($n+1); }
721 else { () = sort rec 1,2; }
722
723 $failed = 1 if !defined $n;
724 }
725
726 rec(1);
f34362ee 727 main::ok(!$failed, "sort from active sub");
9850bf21
RH
728}
729
730# $a and $b are set in the package the sort() is called from,
731# *not* the package the sort sub is in. This is longstanding
732# de facto behaviour that shouldn't be broken.
733package main;
f34362ee 734my $answer = "good";
9850bf21
RH
735() = sort OtherPack::foo 1,2,3,4;
736
9da9462b
RGS
737{
738 package OtherPack;
739 no warnings 'once';
740 sub foo {
f34362ee 741 $answer = "something was unexpectedly defined or undefined" if
9da9462b
RGS
742 defined($a) || defined($b) || !defined($main::a) || !defined($main::b);
743 $main::a <=> $main::b;
744 }
745}
9850bf21 746
f34362ee 747main::cmp_ok($answer,'eq','good','sort subr called from other package');
9850bf21
RH
748
749
750# Bug 36430 - sort called in package2 while a
751# sort in package1 is active should set $package2::a/b.
752
f34362ee 753$answer = "good";
9850bf21
RH
754my @list = sort { A::min(@$a) <=> A::min(@$b) }
755 [3, 1, 5], [2, 4], [0];
756
f34362ee 757main::cmp_ok($answer,'eq','good','bug 36430');
9850bf21
RH
758
759package A;
760sub min {
761 my @list = sort {
f34362ee 762 $answer = '$a and/or $b are not defined ' if !defined($a) || !defined($b);
9850bf21
RH
763 $a <=> $b;
764 } @_;
765 $list[0];
766}
767
768# Bug 7567 - an array shouldn't be modifiable while it's being
769# sorted in-place.
770eval { @a=(1..8); @a = sort { @a = (0) } @a; };
771
f34362ee
DL
772$fail_msg = q(Modification of a read-only value attempted);
773main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'bug 7567');
774
775
9850bf21
RH
776
777# Sorting shouldn't increase the refcount of a sub
778sub foo {(1+$a) <=> (1+$b)}
779my $refcnt = &Internals::SvREFCNT(\&foo);
780@output = sort foo 3,7,9;
781package Foo;
782ok($refcnt, &Internals::SvREFCNT(\&foo), "sort sub refcnt");
f34362ee 783$fail_msg = q(Modification of a read-only value attempted);
9850bf21
RH
784# Sorting a read-only array in-place shouldn't be allowed
785my @readonly = (1..10);
786Internals::SvREADONLY(@readonly, 1);
787eval { @readonly = sort @readonly; };
f34362ee
DL
788main::cmp_ok(substr($@,0,length($fail_msg)),'eq',$fail_msg,'in-place sort of read-only array');
789
790
791
9850bf21
RH
792
793# Using return() should be okay even in a deeper context
794@b = sort {while (1) {return ($a <=> $b)} } 1..10;
795ok("@b", "1 2 3 4 5 6 7 8 9 10", "return within loop");
d7507f74
RH
796
797# Using return() should be okay even if there are other items
798# on the stack at the time.
799@b = sort {$_ = ($a<=>$b) + do{return $b<=> $a}} 1..10;
800ok("@b", "10 9 8 7 6 5 4 3 2 1", "return with SVs on stack");
801
802# As above, but with a sort sub rather than a sort block.
803sub ret_with_stacked { $_ = ($a<=>$b) + do {return $b <=> $a} }
804@b = sort ret_with_stacked 1..10;
805ok("@b", "10 9 8 7 6 5 4 3 2 1", "return with SVs on stack");