Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

228 lines (182 sloc) 7.333 kb
use v6;
use Test;
=begin description
Tests subtypes, specifically in the context of multimethod dispatch.
=end description
# L<S12/"Types and Subtypes">
my $abs = '
multi sub my_abs (Int $n where { $^n >= 0 }){ $n }
multi sub my_abs (Int $n where { $^n < 0 }){ -$n }
';
ok(eval("$abs; 1"), "we can compile subtype declarations");
is(eval("$abs; my_abs(3)"), 3, "and we can use them, too");
is(eval("$abs; my_abs(-5)"), 5, "and they actually work");
# another nice example
{
multi factorial (Int $x) { $x * factorial($x-1) };
multi factorial (Int $x where 0 ) { 1 }; #OK not used
is factorial(3), 6, 'subset types refine candidate matches';
}
# Basic subtype creation
{
subset Int::Odd of Int where { $^num % 2 == 1 };
is eval('my Int::Odd $a = 3'), 3, "3 is an odd num";
# The eval inside the eval is/will be necessary to hider our smarty
# compiler's compile-time from bailing.
# (Actually, if the compiler is *really* smarty, it will notice our eval trick,
# too :))
is eval('my Int::Odd $b = 3; try { $b = eval "4" }; $b'), 3,
"objects of Int::Odd don't get even";
# Subtypes should be undefined.
nok Int::Odd.defined, 'subtypes are undefined';
# Subs with arguments of a subtype
sub only_accepts_odds(Int::Odd $odd) { $odd + 1 }
is only_accepts_odds(3), 4, "calling sub worked";
dies_ok { only_accepts_odds(4) }, "calling sub did not work";
# Can smartmatch too
sub is_num_odd(Int::Odd $odd) { $odd ~~ Int::Odd },
ok is_num_odd(3), "Int accepted by Int::Odd";
}
# The same, but lexically
{
my subset Int::Even of Int where { $^num % 2 == 0 }
ok my Int::Even $c = 6;
ok $c ~~ Int::Even, "our var is a Int::Even";
try { $c = eval 7 }
is $c, 6, "setting a Int::Even to an odd value dies";
ok eval('!try { my Int::Even $d }'),
"lexically declared subtype went out of scope";
}
# Following code is evil, but should work:
{
my Int $multiple_of;
subset Num::Multiple of Int where { $^num % $multiple_of == 0 }
$multiple_of = 5;
ok $multiple_of ~~ Int, "basic sanity (1)";
is $multiple_of, 5, "basic sanity (2)";
ok (my Num::Multiple $d = 10), "creating a new Num::Multiple";
is $d, 10, "creating a new Num::Multiple actually worked";
dies_ok { $d = 7 }, 'negative test also works';
is $d, 10, 'variable kept previous value';
$multiple_of = 6;
dies_ok { my Num::Multiple $e = 10 }, "changed subtype definition worked";
}
# Rakudo had a bug where 'where /regex/' failed
# http://rt.perl.org/rt3/Ticket/Display.html?id=60976
#?DOES 2
{
subset HasA of Str where /a/;
lives_ok { my HasA $x = 'bla' }, 'where /regex/ works (positive)';
eval_dies_ok 'my HasA $x = "foo"', 'where /regex/ works (negative)';
}
# You can write just an expression rather than a block after where in a sub
# and it will smart-match it.
{
sub anon_where_1($x where "x") { 1 } #OK not used
sub anon_where_2($x where /x/) { 1 } #OK not used
is(anon_where_1('x'), 1, 'where works with smart-matching on string');
dies_ok({ anon_where_1('y') }, 'where works with smart-matching on string');
is(anon_where_2('x'), 1, 'where works with smart-matching on regex');
is(anon_where_2('xyz'), 1, 'where works with smart-matching on regex');
dies_ok({ anon_where_2('y') }, 'where works with smart-matching on regex');
}
# Block parameter to smart-match is readonly.
{
subset SoWrong of Str where { $^epic = "fail" }
sub so_wrong_too($x where { $^epic = "fail" }) { } #OK not used
my SoWrong $x;
dies_ok({ $x = 42 }, 'parameter in subtype is read-only...');
dies_ok({ so_wrong_too(42) }, '...even in anonymous ones.');
}
# ensure that various operations do type cheks
{
subset AnotherEven of Int where { $_ % 2 == 0 };
my AnotherEven $x = 2;
dies_ok { $x++ }, 'Even $x can not be ++ed';
is $x, 2, '..and the value was preserved';
dies_ok { $x-- }, 'Even $x can not be --ed';
is $x, 2, 'and the value was preserved';
}
{
# chained subset types
subset Positive of Int where { $_ > 0 };
subset NotTooLarge of Positive where { $_ < 10 };
my NotTooLarge $x;
lives_ok { $x = 5 }, 'can satisfy both conditions on chained subset types';
dies_ok { $x = -2 }, 'violating first condition barfs';
dies_ok { $x = 22 }, 'violating second condition barfs';
}
# subtypes based on user defined classes and roles
{
class C1 { has $.a }
subset SC1 of C1 where { .a == 42 }
ok !(C1.new(a => 1) ~~ SC1), 'subtypes based on classes work';
ok C1.new(a => 42) ~~ SC1, 'subtypes based on classes work';
}
{
role R1 { };
subset SR1 of R1 where 1;
ok !(1 ~~ SR1), 'subtypes based on roles work';
my $x = 1 but R1;
ok $x ~~ SR1, 'subtypes based on roles work';
}
subset NW1 of Int;
ok NW1 ~~ Int, 'subset declaration without where clause does type it refines';
ok 0 ~~ NW1, 'subset declaration without where clause accepts right value';
ok 42 ~~ NW1, 'subset declaration without where clause accepts right value';
ok 4.2 !~~ NW1, 'subset declaration without where clause rejects wrong value';
ok "x" !~~ NW1, 'subset declaration without where clause rejects wrong value';
# RT #65700
{
subset Small of Int where { $^n < 10 }
class RT65700 {
has Small $.small;
}
dies_ok { RT65700.new( small => 20 ) }, 'subset type is enforced as attribute in new() (1)';
lives_ok { RT65700.new( small => 2 ) }, 'subset type enforced as attribute in new() (2)';
my subset Teeny of Int where { $^n < 10 }
class T { has Teeny $.teeny }
dies_ok { T.new( teeny => 20 ) }, 'my subset type is enforced as attribute in new() (1)';
lives_ok { T.new( teeny => 2 ) }, 'my subset type enforced as attribute in new() (2)';
}
# RT #78318
{
my @*rt78318;
subset Bug of Int where { @*rt78318.push( 'bug' ) };
subset Hunt of Bug where { @*rt78318.push( 'hunt' ) };
78318 ~~ Hunt;
is @*rt78318, <bug hunt>, 'code called when subtype built on subtype';
}
# RT #78322
{
my $*call1;
my $*call2;
$*call1 = 0;$*call2 = 0;
subset RT78322 of Int where { $*call1++; $^a == 78322 };
subset Bughunt of RT78322 where { $*call2++; ?1 };
$*call1 = 0;$*call2 = 0;
nok 22 ~~ RT78322, 'level one subset check is false';
is $*call1, 1, 'level one subset checked (should fail)';
is $*call2, 0, 'level two subset not checked';
$*call1 = 0;$*call2 = 0;
nok 22 ~~ Bughunt, 'overall subset check is false';
is $*call1, 1, 'level one subset checked (should fail)';
is $*call2, 0, 'level two subset not checked';
$*call1 = 0;$*call2 = 0;
ok 78322 ~~ RT78322, 'level one subset check is true';
is $*call1, 1, 'level one subset checked (should succeed)';
is $*call2, 0, 'level two subset not checked';
$*call1 = 0;$*call2 = 0;
ok 78322 ~~ Bughunt, 'overall subset check is true';
is $*call1, 1, 'level one subset checked (should succeed)';
is $*call2, 1, 'level two subset checked (should succeed)';
}
# RT #75718
{
roles R { };
subset S of R;
nok 1 ~~ S, 'subsets of roles (1)';
ok R ~~ S, 'subsets of roles (2)';
}
done;
# vim: ft=perl6
Jump to Line
Something went wrong with that request. Please try again.