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[perl5.git] / t / op / concat.t
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1#!./perl
2
3BEGIN {
4 chdir 't' if -d 't';
5 @INC = '../lib';
6}
7
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8# This ok() function is specially written to avoid any concatenation.
9my $test = 1;
10sub ok {
11 my($ok, $name) = @_;
bdaa056b 12
0dee2995 13 printf "%sok %d - %s\n", ($ok ? "" : "not "), $test, $name;
bdaa056b 14
0dee2995 15 printf "# Failed test at line %d\n", (caller)[2] unless $ok;
bdaa056b 16
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17 $test++;
18 return $ok;
19}
bdaa056b 20
9133b639 21print "1..20\n";
bdaa056b 22
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23($a, $b, $c) = qw(foo bar);
24
25ok("$a" eq "foo", "verifying assign");
26ok("$a$b" eq "foobar", "basic concatenation");
27ok("$c$a$c" eq "foo", "concatenate undef, fore and aft");
bdaa056b 28
0dee2995 29# Okay, so that wasn't very challenging. Let's go Unicode.
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30
31{
32 # bug id 20000819.004
33
34 $_ = $dx = "\x{10f2}";
35 s/($dx)/$dx$1/;
36 {
0dee2995 37 ok($_ eq "$dx$dx","bug id 20000819.004, back");
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38 }
39
40 $_ = $dx = "\x{10f2}";
41 s/($dx)/$1$dx/;
42 {
0dee2995 43 ok($_ eq "$dx$dx","bug id 20000819.004, front");
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44 }
45
46 $dx = "\x{10f2}";
47 $_ = "\x{10f2}\x{10f2}";
48 s/($dx)($dx)/$1$2/;
49 {
0dee2995 50 ok($_ eq "$dx$dx","bug id 20000819.004, front and back");
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51 }
52}
53
54{
55 # bug id 20000901.092
56 # test that undef left and right of utf8 results in a valid string
57
58 my $a;
59 $a .= "\x{1ff}";
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60 ok($a eq "\x{1ff}", "bug id 20000901.092, undef left");
61 $a .= undef;
62 ok($a eq "\x{1ff}", "bug id 20000901.092, undef right");
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63}
64
65{
66 # ID 20001020.006
67
68 "x" =~ /(.)/; # unset $2
69
70 # Without the fix this 5.7.0 would croak:
71 # Modification of a read-only value attempted at ...
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72 eval {"$2\x{1234}"};
73 ok(!$@, "bug id 20001020.006, left");
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74
75 # For symmetry with the above.
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76 eval {"\x{1234}$2"};
77 ok(!$@, "bug id 20001020.006, right");
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78
79 *pi = \undef;
80 # This bug existed earlier than the $2 bug, but is fixed with the same
81 # patch. Without the fix this 5.7.0 would also croak:
82 # Modification of a read-only value attempted at ...
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83 eval{"$pi\x{1234}"};
84 ok(!$@, "bug id 20001020.006, constant left");
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85
86 # For symmetry with the above.
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87 eval{"\x{1234}$pi"};
88 ok(!$@, "bug id 20001020.006, constant right");
bdaa056b 89}
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90
91sub beq { use bytes; $_[0] eq $_[1]; }
92
93{
94 # concat should not upgrade its arguments.
95 my($l, $r, $c);
96
97 ($l, $r, $c) = ("\x{101}", "\x{fe}", "\x{101}\x{fe}");
98 ok(beq($l.$r, $c), "concat utf8 and byte");
99 ok(beq($l, "\x{101}"), "right not changed after concat u+b");
100 ok(beq($r, "\x{fe}"), "left not changed after concat u+b");
101
102 ($l, $r, $c) = ("\x{fe}", "\x{101}", "\x{fe}\x{101}");
103 ok(beq($l.$r, $c), "concat byte and utf8");
104 ok(beq($l, "\x{fe}"), "right not changed after concat b+u");
105 ok(beq($r, "\x{101}"), "left not changed after concat b+u");
106}
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107
108{
109 my $a; ($a .= 5) . 6;
c3029c66 110 ok($a == 5, '($a .= 5) . 6 - present since 5.000');
0165acc7 111}
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112
113{
114 # [perl #24508] optree construction bug
115 sub strfoo { "x" }
116 my ($x, $y);
117 $y = ($x = '' . strfoo()) . "y";
118 ok( "$x,$y" eq "x,xy", 'figures out correct target' );
119}