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use v6;
use Test;
# Tests for the Proxy class
# L<S06/Lvalue subroutines/"or a specially tied proxy object, with suitably">
# Return value of assignments of Proxy objects is decided now.
# See thread "Assigning Proxy objects" on p6l,
# L<"http://www.nntp.perl.org/group/perl.perl6.language/21838">.
# Quoting Larry:
# The intention is that lvalue subs behave in all respects as if they
# were variables.  So consider what
#
# say $nonproxy = 40;
#
# should do.
plan 24;
my $foo = 42;
my $was_inside = 0;
sub lvalue_test1() is rw {
$was_inside++;
return Proxy.new:
FETCH => method () { 100 + $foo },
STORE => method ($new) { $foo = $new - 100 };
};
{
is $foo, 42, "basic sanity (1)";
is $was_inside, 0, "basic sanity (2)";
is lvalue_test1(), 142, "getting var through Proxy (1)";
# No todo_is here to avoid unexpected succeeds (? - elaborate?)
is $was_inside, 1, "lvalue_test1() was called (1)";
is (lvalue_test1() = 123), 123, "setting var through Proxy";
is $was_inside, 2, "lvalue_test1() was called (2)";
is $foo, 23, "var was correctly set (1)";
is lvalue_test1(), 123, "getting var through Proxy (2)";
is $was_inside, 3, "lvalue_test1() was called (3)";
}
$foo = 4;
$was_inside = 0;
sub lvalue_test2() is rw {
$was_inside++;
return Proxy.new:
FETCH => method () { 10 + $foo },
STORE => method ($new) { $foo = $new - 100 };
};
{
is $foo, 4, "basic sanity (3)";
is $was_inside, 0, "basic sanity (4)";
is lvalue_test2(), 14, "getting var through Proxy (4)";
# No todo_is here to avoid unexpected succeeds
is $was_inside, 1, "lvalue_test2() was called (4)";
is (lvalue_test2() = 106), 16, "setting var through Proxy returns new value of the var";
is $was_inside, 2, "lvalue_test2() was called (5)";
is $foo, 6, "var was correctly set (2)";
is lvalue_test2(), 16, "getting var through Proxy (5)";
is $was_inside, 3, "lvalue_test2() was called (5)";
}
$foo = 4;
$was_inside = 0;
sub lvalue_test3() {
$was_inside++;
return Proxy.new:
FETCH => method () { 10 + $foo },
STORE => method ($new) { $was_inside = 42 };
};
{
is $foo, 4, "basic sanity (6)";
is $was_inside, 0, "basic sanity (7)";
is lvalue_test3(), 14, "getting var through Proxy (8)";
# No todo_is here to avoid unexpected succeeds
is $was_inside, 1, "lvalue_test3() was called (8)";
#?rakudo todo 'RT#124341 Proxy should not escape return from a non is-rw'
dies-ok { EVAL '(lvalue_test3() = 42)' }, "Proxy returned from non is-rw is prefetched rvalue";
#?rakudo todo 'RT#124341 Proxy should not escape return from a non is-rw'
is $was_inside, 2, "lvalue_test3() was called (9)";
}
# vim: ft=perl6