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[perl5.git] / t / op / sort.t
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1#!./perl
2
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3BEGIN {
4 chdir 't' if -d 't';
93430cb4 5 unshift @INC, '../lib';
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6}
7print "1..37\n";
a687059c 8
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9# XXX known to leak scalars
10$ENV{PERL_DESTRUCT_LEVEL} = 0 unless $ENV{PERL_DESTRUCT_LEVEL} > 3;
11
2f52a358 12sub backwards { $a lt $b ? 1 : $a gt $b ? -1 : 0 }
a687059c 13
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14my $upperfirst = 'A' lt 'a';
15
16# Beware: in future this may become hairier because of possible
17# collation complications: qw(A a B c) can be sorted at least as
18# any of the following
19#
20# A a B b
21# A B a b
22# a b A B
23# a A b B
24#
25# All the above orders make sense.
26#
27# That said, EBCDIC sorts all small letters first, as opposed
28# to ASCII which sorts all big letters first.
29
a687059c 30@harry = ('dog','cat','x','Cain','Abel');
2f52a358 31@george = ('gone','chased','yz','punished','Axed');
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32
33$x = join('', sort @harry);
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34$expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
35print "# 1: x = '$x', expected = '$expected'\n";
36print ($x eq $expected ? "ok 1\n" : "not ok 1\n");
a687059c 37
a0d0e21e 38$x = join('', sort( backwards @harry));
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39$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
40print "# 2: x = '$x', expected = '$expected'\n";
41print ($x eq $expected ? "ok 2\n" : "not ok 2\n");
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42
43$x = join('', sort @george, 'to', @harry);
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44$expected = $upperfirst ?
45 'AbelAxedCaincatchaseddoggonepunishedtoxyz' :
46 'catchaseddoggonepunishedtoxyzAbelAxedCain' ;
47print "# 3: x = '$x', expected = '$expected'\n";
48print ($x eq $expected ?"ok 3\n":"not ok 3\n");
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49
50@a = ();
51@b = reverse @a;
52print ("@b" eq "" ? "ok 4\n" : "not ok 4 (@b)\n");
53
54@a = (1);
55@b = reverse @a;
56print ("@b" eq "1" ? "ok 5\n" : "not ok 5 (@b)\n");
57
58@a = (1,2);
59@b = reverse @a;
60print ("@b" eq "2 1" ? "ok 6\n" : "not ok 6 (@b)\n");
61
62@a = (1,2,3);
63@b = reverse @a;
64print ("@b" eq "3 2 1" ? "ok 7\n" : "not ok 7 (@b)\n");
65
66@a = (1,2,3,4);
67@b = reverse @a;
68print ("@b" eq "4 3 2 1" ? "ok 8\n" : "not ok 8 (@b)\n");
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69
70@a = (10,2,3,4);
71@b = sort {$a <=> $b;} @a;
72print ("@b" eq "2 3 4 10" ? "ok 9\n" : "not ok 9 (@b)\n");
988174c1 73
463ee0b2 74$sub = 'backwards';
988174c1 75$x = join('', sort $sub @harry);
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76$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
77print "# 10: x = $x, expected = '$expected'\n";
78print ($x eq $expected ? "ok 10\n" : "not ok 10\n");
988174c1 79
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80# literals, combinations
81
82@b = sort (4,1,3,2);
83print ("@b" eq '1 2 3 4' ? "ok 11\n" : "not ok 11\n");
84print "# x = '@b'\n";
85
86@b = sort grep { $_ } (4,1,3,2);
87print ("@b" eq '1 2 3 4' ? "ok 12\n" : "not ok 12\n");
88print "# x = '@b'\n";
89
90@b = sort map { $_ } (4,1,3,2);
91print ("@b" eq '1 2 3 4' ? "ok 13\n" : "not ok 13\n");
92print "# x = '@b'\n";
93
94@b = sort reverse (4,1,3,2);
95print ("@b" eq '1 2 3 4' ? "ok 14\n" : "not ok 14\n");
96print "# x = '@b'\n";
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97
98$^W = 0;
99# redefining sort sub inside the sort sub should fail
100sub twoface { *twoface = sub { $a <=> $b }; &twoface }
101eval { @b = sort twoface 4,1,3,2 };
102print ($@ =~ /redefine active sort/ ? "ok 15\n" : "not ok 15\n");
103
104# redefining sort subs outside the sort should not fail
105eval { *twoface = sub { &backwards } };
106print $@ ? "not ok 16\n" : "ok 16\n";
107
108eval { @b = sort twoface 4,1,3,2 };
109print ("@b" eq '4 3 2 1' ? "ok 17\n" : "not ok 17 |@b|\n");
110
111*twoface = sub { *twoface = *backwards; $a <=> $b };
112eval { @b = sort twoface 4,1 };
113print ($@ =~ /redefine active sort/ ? "ok 18\n" : "not ok 18\n");
114
115*twoface = sub {
116 eval 'sub twoface { $a <=> $b }';
117 die($@ =~ /redefine active sort/ ? "ok 19\n" : "not ok 19\n");
118 $a <=> $b;
119 };
120eval { @b = sort twoface 4,1 };
121print $@ ? "$@" : "not ok 19\n";
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122
123eval <<'CODE';
124 my @result = sort main'backwards 'one', 'two';
125CODE
126print $@ ? "not ok 20\n# $@" : "ok 20\n";
127
128eval <<'CODE';
129 # "sort 'one', 'two'" should not try to parse "'one" as a sort sub
130 my @result = sort 'one', 'two';
131CODE
132print $@ ? "not ok 21\n# $@" : "ok 21\n";
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133
134{
135 my $sortsub = \&backwards;
136 my $sortglob = *backwards;
62f274bf 137 my $sortglobr = \*backwards;
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138 my $sortname = 'backwards';
139 @b = sort $sortsub 4,1,3,2;
140 print ("@b" eq '4 3 2 1' ? "ok 22\n" : "not ok 22 |@b|\n");
141 @b = sort $sortglob 4,1,3,2;
142 print ("@b" eq '4 3 2 1' ? "ok 23\n" : "not ok 23 |@b|\n");
143 @b = sort $sortname 4,1,3,2;
144 print ("@b" eq '4 3 2 1' ? "ok 24\n" : "not ok 24 |@b|\n");
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145 @b = sort $sortglobr 4,1,3,2;
146 print ("@b" eq '4 3 2 1' ? "ok 25\n" : "not ok 25 |@b|\n");
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147}
148
149{
150 local $sortsub = \&backwards;
151 local $sortglob = *backwards;
62f274bf 152 local $sortglobr = \*backwards;
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153 local $sortname = 'backwards';
154 @b = sort $sortsub 4,1,3,2;
62f274bf 155 print ("@b" eq '4 3 2 1' ? "ok 26\n" : "not ok 26 |@b|\n");
c6e96bcb 156 @b = sort $sortglob 4,1,3,2;
62f274bf 157 print ("@b" eq '4 3 2 1' ? "ok 27\n" : "not ok 27 |@b|\n");
c6e96bcb 158 @b = sort $sortname 4,1,3,2;
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159 print ("@b" eq '4 3 2 1' ? "ok 28\n" : "not ok 28 |@b|\n");
160 @b = sort $sortglobr 4,1,3,2;
161 print ("@b" eq '4 3 2 1' ? "ok 29\n" : "not ok 29 |@b|\n");
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162}
163
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164## exercise sort builtins... ($a <=> $b already tested)
165@a = ( 5, 19, 1996, 255, 90 );
166@b = sort { $b <=> $a } @a;
167print ("@b" eq '1996 255 90 19 5' ? "ok 30\n" : "not ok 30\n");
168print "# x = '@b'\n";
169$x = join('', sort { $a cmp $b } @harry);
170$expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
171print ($x eq $expected ? "ok 31\n" : "not ok 31\n");
172print "# x = '$x'; expected = '$expected'\n";
173$x = join('', sort { $b cmp $a } @harry);
174$expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
175print ($x eq $expected ? "ok 32\n" : "not ok 32\n");
176print "# x = '$x'; expected = '$expected'\n";
177{
178 use integer;
179 @b = sort { $a <=> $b } @a;
180 print ("@b" eq '5 19 90 255 1996' ? "ok 33\n" : "not ok 33\n");
181 print "# x = '@b'\n";
182 @b = sort { $b <=> $a } @a;
183 print ("@b" eq '1996 255 90 19 5' ? "ok 34\n" : "not ok 34\n");
184 print "# x = '@b'\n";
185 $x = join('', sort { $a cmp $b } @harry);
186 $expected = $upperfirst ? 'AbelCaincatdogx' : 'catdogxAbelCain';
187 print ($x eq $expected ? "ok 35\n" : "not ok 35\n");
188 print "# x = '$x'; expected = '$expected'\n";
189 $x = join('', sort { $b cmp $a } @harry);
190 $expected = $upperfirst ? 'xdogcatCainAbel' : 'CainAbelxdogcat';
191 print ($x eq $expected ? "ok 36\n" : "not ok 36\n");
192 print "# x = '$x'; expected = '$expected'\n";
193}
194# test sorting in non-main package
195package Foo;
196@a = ( 5, 19, 1996, 255, 90 );
197@b = sort { $b <=> $a } @a;
198print ("@b" eq '1996 255 90 19 5' ? "ok 37\n" : "not ok 37\n");
199print "# x = '@b'\n";