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|
=pod
=encoding utf-8
=head1 PURPOSE
Test positional parameters: required versus optional; lexical
versus localized versus anonymous; various types of defaults.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2014, 2017 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
use strict;
use warnings;
use Test::More;
use Test::Fatal;
{
package Example;
use Kavorka;
fun foo ($x) {
return { '@_' => \@_, '$x' => $x, };
}
fun bar ($, $x) {
return { '@_' => \@_, '$x' => $x, };
}
fun baz ($x, $y) {
return { '@_' => \@_, '$x' => $x, '$y' => $y, };
}
fun quux (${^ONE}, $_) {
return { '@_' => \@_, '${^ONE}' => ${^ONE}, '$_' => $_ };
}
}
is_deeply(
Example::foo('A'),
{ '@_' => ['A'], '$x' => 'A' },
'function with one positional parameter'
);
is_deeply(
Example::bar('A', 'B'),
{ '@_' => ['A', 'B'], '$x' => 'B' },
'function with two positional parameters, the first of which is anonymous'
);
is_deeply(
Example::baz('A', 'B'),
{ '@_' => ['A', 'B'], '$x' => 'A', '$y' => 'B' },
'function with two positional parameters'
);
is_deeply(
Example::quux('A', 'B'),
{ '@_' => ['A', 'B'], '${^ONE}' => 'A', '$_' => 'B' },
'function with two positional parameters using localized global variables'
);
{
package Example2;
use Kavorka;
fun foo ($x?) {
return { '@_' => \@_, '$x' => $x, };
}
fun bar ($x = 42) {
return { '@_' => \@_, '$x' => $x, };
}
fun baz ($x //= 42) {
return { '@_' => \@_, '$x' => $x, };
}
fun quux ($x ||= 42) {
return { '@_' => \@_, '$x' => $x, };
}
fun xyzzy ($x=,$=,$y=) {
return { '@_' => \@_, '$x' => $x, '$y' => $y };
}
}
is_deeply(
Example2::foo(666),
{ '@_' => [666], '$x' => '666' },
'optional positional parameter supplied'
);
is_deeply(
Example2::foo(undef),
{ '@_' => [undef], '$x' => undef },
'optional positional parameter supplied undef'
);
is_deeply(
Example2::foo(),
{ '@_' => [], '$x' => undef },
'optional positional parameter omitted'
);
is_deeply(
Example2::bar(666),
{ '@_' => [666], '$x' => '666' },
'positional parameter with default supplied'
);
is_deeply(
Example2::bar(undef),
{ '@_' => [undef], '$x' => undef },
'positional parameter with default supplied undef'
);
is_deeply(
Example2::bar(),
{ '@_' => [], '$x' => 42 },
'positional parameter with default omitted'
);
is_deeply(
Example2::baz(666),
{ '@_' => [666], '$x' => '666' },
'positional parameter with //=default supplied'
);
is_deeply(
Example2::baz(undef),
{ '@_' => [undef], '$x' => 42 },
'positional parameter with //=default supplied undef'
);
is_deeply(
Example2::baz(0),
{ '@_' => [0], '$x' => 0 },
'positional parameter with //=default supplied false'
);
is_deeply(
Example2::baz(),
{ '@_' => [], '$x' => 42 },
'positional parameter with //=default omitted'
);
is_deeply(
Example2::quux(666),
{ '@_' => [666], '$x' => '666' },
'positional parameter with ||=default supplied'
);
is_deeply(
Example2::quux(undef),
{ '@_' => [undef], '$x' => 42 },
'positional parameter with ||=default supplied undef'
);
is_deeply(
Example2::quux(0),
{ '@_' => [0], '$x' => 42 },
'positional parameter with ||=default supplied false'
);
is_deeply(
Example2::quux(),
{ '@_' => [], '$x' => 42 },
'positional parameter with ||=default omitted'
);
is_deeply(
Example2::xyzzy(42),
{ '@_' => [42], '$x' => 42, '$y' => undef },
'crazy bare =',
);
is_deeply(
Example2::xyzzy(42, 4),
{ '@_' => [42, 4], '$x' => 42, '$y' => undef },
'crazy bare =',
);
is_deeply(
Example2::xyzzy(42, 4, 2),
{ '@_' => [42, 4, 2], '$x' => 42, '$y' => 2 },
'crazy bare =',
);
{
package Example3;
use Kavorka;
fun foo ($x, @) {
return { '@_' => \@_, '$x' => $x, };
}
fun bar ($x, %) {
return { '@_' => \@_, '$x' => $x, };
}
fun baz ($x, ...) {
return { '@_' => \@_, '$x' => $x, };
}
}
is_deeply(
Example3::foo(42, quux => 'xyzzy'),
{ '@_' => [42, quux => 'xyzzy'], '$x' => 42 },
'Signature ($x, @) works',
);
is_deeply(
Example3::bar(42, quux => 'xyzzy'),
{ '@_' => [42, quux => 'xyzzy'], '$x' => 42 },
'Signature ($x, %) works',
);
is_deeply(
Example3::baz(42, quux => 'xyzzy'),
{ '@_' => [42, quux => 'xyzzy'], '$x' => 42 },
'Signature ($x, ...) works',
);
like(
exception { Example3::bar(42, 'xyzzy') },
qr/^Odd number of elements in anonymous hash/,
'Signature ($x, %) can throw',
);
is(
exception { Example3::baz(42, 'xyzzy') },
undef,
"Signature (\$x, ...) won't throw",
);
done_testing;
|
