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join() with an empty list and undef separator may not warn in the future
[perl5.git] / t / op / join.t
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1#!./perl
2
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3BEGIN {
4 chdir 't' if -d 't';
5 @INC = '../lib';
6 require './test.pl';
7}
8d063cd8 8
cd0ac484 9plan tests => 26;
5e61c969 10
8d063cd8 11@x = (1, 2, 3);
2d7bc9fa 12is( join(':',@x), '1:2:3', 'join an array with character');
8d063cd8 13
2d7bc9fa 14is( join('',1,2,3), '123', 'join list with no separator');
8d063cd8 15
2d7bc9fa 16is( join(':',split(/ /,"1 2 3")), '1:2:3', 'join implicit array with character');
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17
18my $f = 'a';
19$f = join ',', 'b', $f, 'e';
2d7bc9fa 20is( $f, 'b,a,e', 'join list back to self, middle of list');
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21
22$f = 'a';
23$f = join ',', $f, 'b', 'e';
2d7bc9fa 24is( $f, 'a,b,e', 'join list back to self, beginning of list');
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25
26$f = 'a';
27$f = join $f, 'b', 'e', 'k';
2d7bc9fa 28is( $f, 'baeak', 'join back to self, self is join character');
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29
30# 7,8 check for multiple read of tied objects
31{ package X;
32 sub TIESCALAR { my $x = 7; bless \$x };
33 sub FETCH { my $y = shift; $$y += 5 };
34 tie my $t, 'X';
35 my $r = join ':', $t, 99, $t, 99;
2d7bc9fa 36 main::is($r, '12:99:17:99', 'check for multiple read of tied objects, with separator');
1426bbf4 37 $r = join '', $t, 99, $t, 99;
2d7bc9fa 38 main::is($r, '22992799', 'check for multiple read of tied objects, w/o separator, and magic');
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39};
40
41# 9,10 and for multiple read of undef
42{ my $s = 5;
43 local ($^W, $SIG{__WARN__}) = ( 1, sub { $s+=4 } );
44 my $r = join ':', 'a', undef, $s, 'b', undef, $s, 'c';
2d7bc9fa 45 is( $r, 'a::9:b::13:c', 'multiple read of undef, with separator');
1426bbf4 46 my $r = join '', 'a', undef, $s, 'b', undef, $s, 'c';
2d7bc9fa 47 is( $r, 'a17b21c', '... and without separator');
1426bbf4 48};
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49
50{ my $s = join("", chr(0x1234), chr(0xff));
2d7bc9fa 51 is( $s, "\x{1234}\x{ff}", 'join two characters with multiple bytes, get two characters');
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52}
53
54{ my $s = join(chr(0xff), chr(0x1234), "");
2d7bc9fa 55 is( $s, "\x{1234}\x{ff}", 'high byte character as separator, 1 multi-byte character in front');
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56}
57
58{ my $s = join(chr(0x1234), chr(0xff), chr(0x2345));
2d7bc9fa 59 is( $s, "\x{ff}\x{1234}\x{2345}", 'multibyte character as separator');
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60}
61
62{ my $s = join(chr(0xff), chr(0x1234), chr(0xfe));
2d7bc9fa 63 is( $s, "\x{1234}\x{ff}\x{fe}", 'high byte as separator, multi-byte and high byte list');
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64}
65
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66{ my $s = join('x', ());
67 is( $s, '', 'join should return empty string for empty list');
68}
69
70{ my $s = join('', ());
71 is( $s, '', 'join should return empty string for empty list and empty separator as well');
72}
73
74{ my $w;
75 local $SIG{__WARN__} = sub { $w = shift };
76 use warnings "uninitialized";
77 my $s = join(undef, ());
78 is( $s, '', 'join should return empty string for empty list, when separator is undef');
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79 # this warning isn't normative, the implementation may choose to
80 # not evaluate the separator as a string if the list has fewer than
81 # two elements
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82 like $w, qr/^Use of uninitialized value in join/, "should warn if separator is undef";
83}
84
85
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86{ # [perl #24846] $jb2 should be in bytes, not in utf8.
87 my $b = "abc\304";
88 my $u = "abc\x{0100}";
89
90 sub join_into_my_variable {
91 my $r = join("", @_);
92 return $r;
93 }
94
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95 sub byte_is {
96 use bytes;
97 return $_[0] eq $_[1] ? pass($_[2]) : fail($_[2]);
98 }
99
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100 my $jb1 = join_into_my_variable("", $b);
101 my $ju1 = join_into_my_variable("", $u);
102 my $jb2 = join_into_my_variable("", $b);
103 my $ju2 = join_into_my_variable("", $u);
104
2d7bc9fa 105 note( 'utf8 and byte checks, perl #24846' );
e4803c42 106
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107 byte_is($jb1, $b);
108 is( $jb1, $b );
21703f85 109
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110 byte_is($ju1, $u);
111 is( $ju1, $u );
21703f85 112
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113 byte_is($jb2, $b);
114 is( $jb2, $b );
115
116 byte_is($ju2, $u);
117 is( $ju2, $u );
e4803c42 118}
2d7bc9fa 119