summaryrefslogtreecommitdiff
path: root/t/op/aassign.t
blob: 622053c00439a0953daaa749187726cf58c5337d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
#!./perl -w

# Some miscellaneous checks for the list assignment operator, OP_AASSIGN.
#
# This file was only added in 2015; before then, such tests were
# typically in various other random places like op/array.t. This test file
# doesn't therefore attempt to be comprehensive; it merely provides a
# central place to new put additional tests, especially those related to
# the trickiness of commonality, e.g. ($a,$b) = ($b,$a).
#
# In particular, it's testing the flags
#    OPpASSIGN_COMMON_SCALAR
#    OPpASSIGN_COMMON_RC1
#    OPpASSIGN_COMMON_AGG

BEGIN {
    chdir 't' if -d 't';
    @INC = '../lib';
    require './test.pl';
}

use warnings;
use strict;

# general purpose package vars

our $pkg_scalar;
our @pkg_array;
our %pkg_hash;

sub f_ret_14 { return 1..4 }

# stringify a hash ref

sub sh {
    my $rh = $_[0];
    join ',', map "$_:$rh->{$_}", sort keys %$rh;
}


# where the RHS has surplus elements

{
    my ($a,$b);
    ($a,$b) = f_ret_14();
    is("$a:$b", "1:2", "surplus");
}

# common with slices

{
    my @a = (1,2);
    @a[0,1] = @a[1,0];
    is("$a[0]:$a[1]", "2:1", "lex array slice");
}

# package alias

{
    my ($a, $b) = 1..2;
    for $pkg_scalar ($a) {
        ($pkg_scalar, $b) = (3, $a);
        is($pkg_scalar, 3, "package alias pkg");
        is("$a:$b", "3:1", "package alias a:b");
    }
}

# my array/hash populated via closure

{
    my $ra = f1();
    my ($x, @a) = @$ra;
    sub f1 { $x = 1; @a = 2..4; \@a }
    is($x,       2, "my: array closure x");
    is("@a", "3 4", "my: array closure a");

    my $rh = f2();
    my ($k, $v, %h) = (d => 4, %$rh, e => 6);
    sub f2 { $k = 'a'; $v = 1; %h = qw(b 2 c 3); \%h }
    is("$k:$v", "d:4", "my: hash closure k:v");
    is(sh(\%h), "b:2,c:3,e:6", "my: hash closure h");
}


# various shared element scenarios within a my (...)

{
    my ($x,$y) = f3(); # $x and $y on both sides
    sub f3 : lvalue { ($x,$y) = (1,2); $y, $x }
    is ("$x:$y", "2:1", "my: scalar and lvalue sub");
}

{
    my $ra = f4();
    my @a = @$ra;  # elements of @a on both sides
    sub f4 { @a = 1..4; \@a }
    is("@a", "1 2 3 4", "my: array and elements");
}

{
    my $rh = f5();
    my %h = %$rh;  # elements of %h on both sides
    sub f5 { %h = qw(a 1 b 2 c 3); \%h }
    is(sh(\%h), "a:1,b:2,c:3", "my: hash and elements");
}

{
    f6();
    our $xalias6;
    my ($x, $y) = (2, $xalias6);
    sub f6 { $x = 1; *xalias6 = \$x; }
    is ("$x:$y", "2:1", "my: pkg var aliased to lexical");
}


{
    my @a;
    f7();
    my ($x,$y) = @a;
    is ("$x:$y", "2:1", "my: lex array elements aliased");

    sub f7 {
        ($x, $y) = (1,2);
        use feature 'refaliasing';
        no warnings 'experimental';
        \($a[0], $a[1]) = \($y,$x);
    }
}

{
    @pkg_array = ();
    f8();
    my ($x,$y) = @pkg_array;
    is ("$x:$y", "2:1", "my: pkg array elements aliased");

    sub f8 {
        ($x, $y) = (1,2);
        use feature 'refaliasing';
        no warnings 'experimental';
        \($pkg_array[0], $pkg_array[1]) = \($y,$x);
    }
}

{
    f9();
    my ($x,$y) = f9();
    is ("$x:$y", "2:1", "my: pkg scalar alias");

    our $xalias9;
    sub f9 : lvalue {
        ($x, $y) = (1,2);
        *xalias9 = \$x;
        $y, $xalias9;
    }
}

{
    use feature 'refaliasing';
    no warnings 'experimental';

    f10();
    our $pkg10;
    \(my $lex) = \$pkg10;
    my @a = ($lex,3); # equivalent to ($a[0],3)
    is("@a", "1 3", "my: lex alias of array alement");

    sub f10 {
        @a = (1,2);
        \$pkg10 = \$a[0];
    }

}

{
    use feature 'refaliasing';
    no warnings 'experimental';

    f11();
    my @b;
    my @a = (@b);
    is("@a", "2 1", "my: lex alias of array alements");

    sub f11 {
        @a = (1,2);
        \$b[0] = \$a[1];
        \$b[1] = \$a[0];
    }
}

# package aliasing

{
    my ($x, $y) = (1,2);

    for $pkg_scalar ($x) {
        ($pkg_scalar, $y) = (3, $x);
        is("$pkg_scalar,$y", "3,1", "package scalar aliased");
    }
}

# lvalue subs on LHS

{
    my @a;
    sub f12 : lvalue { @a }
    (f12()) = 1..3;
    is("@a", "1 2 3", "lvalue sub on RHS returns array");
}

{
    my ($x,$y);
    sub f13 : lvalue { $x,$y }
    (f13()) = 1..3;
    is("$x:$y", "1:2", "lvalue sub on RHS returns scalars");
}


# package shared scalar vars

{
    our $pkg14a = 1;
    our $pkg14b = 2;
    ($pkg14a,$pkg14b) = ($pkg14b,$pkg14a);
    is("$pkg14a:$pkg14b", "2:1", "shared package scalars");
}

# lexical shared scalar vars

{
    my $a = 1;
    my $b = 2;
    ($a,$b) = ($b,$a);
    is("$a:$b", "2:1", "shared lexical scalars");
}


# lexical nested array elem swap

{
    my @a;
    $a[0][0] = 1;
    $a[0][1] = 2;
    ($a[0][0],$a[0][1]) =  ($a[0][1],$a[0][0]);
    is("$a[0][0]:$a[0][1]", "2:1", "lexical nested array elem swap");
}

# package nested array elem swap

{
    our @a15;
    $a15[0][0] = 1;
    $a15[0][1] = 2;
    ($a15[0][0],$a15[0][1]) =  ($a15[0][1],$a15[0][0]);
    is("$a15[0][0]:$a15[0][1]", "2:1", "package nested array elem swap");
}

# surplus RHS junk
#
{
    our ($a16, $b16);
    ($a16, undef, $b16) = 1..30;
    is("$a16:$b16", "1:3", "surplus RHS junk");
}

done_testing();