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use v6;
use Test;
# L<S03/Item assignment precedence>
plan 38;
# Binding of hash elements.
# See thread "Binding of array elements" on p6l started by Ingo Blechschmidt:
# L<"http://www.nntp.perl.org/group/perl.perl6.language/22915">
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
try { %hash<b> := $var };
is %hash<b>, "d", "basic binding of a hash element (1)";
unless %hash<b> eq "d" {
skip_rest "Skipping binding of hash elements tests (not yet implemented in the normal runcore)";
exit;
}
$var = "e";
is %hash<b>, "e", "basic binding of a hash element (2)";
%hash<b> = "f";
is $var, "f", "basic binding of a hash element (3)";
}
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
$var = "e";
is %hash<b>, "e", "binding of hash elements works with .delete (1)";
%hash.delete("b");
# $var unchanged, but assigning to $var doesn't modify @hash any
# longer; similarily, changing @hash[1] doesn't modify $var now
is $var, "e", "binding of hash elements works with .delete (2)";
#?pugs todo
is ~%hash.values.sort, "x z", "binding of hash elements works with .delete (3)";
$var = "f";
%hash<b> = "g";
is $var, "f", "binding of hash elements works with .delete (4)";
is %hash<b>, "g", "binding of hash elements works with .delete (5)";
}
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
$var = "e";
is %hash<b>, "e", "binding of hash elements works with resetting the hash (1)";
%hash = ();
# $var unchanged, but assigning to $var doesn't modify @hash any
# longer; similarily, changing @hash[1] doesn't modify $var now
is $var, "e", "binding of hash elements works with resetting the hash (2)";
is ~%hash, "", "binding of hash elements works with resetting the hash (3)";
$var = "f";
%hash<b> = "g";
is $var, "f", "binding of hash elements works with resetting the hash (4)";
is %hash<b>, "g", "binding of hash elements works with resetting the hash (5)";
}
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
$var = "e";
is %hash<b>, "e", "binding of hash elements works with rebinding the hash (1)";
my %other_hash = (:p<q>, :r<s>, :t<u>);
%hash := %other_hash;
# $var unchanged, but assigning to $var doesn't modify @hash any
# longer; similarily, changing @hash[1] doesn't modify $var now
is $var, "e", "binding of hash elements works with rebinding the hash (2)";
#?pugs todo
is ~%hash.values.sort, "q s u",
"binding of hash elements works with rebinding the hash (3)";
$var = "f";
%hash<b> = "g";
is $var, "f", "binding of hash elements works with rebinding the hash (4)";
is %hash<b>, "g", "binding of hash elements works with rebinding the hash (5)";
}
{
my sub foo (%h) { %h<b> = "new_value" }
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
foo %hash;
is $var, "new_value", "passing a hash to a sub expecting a hash behaves correctly (1)";
#?pugs todo
is ~%hash.values.sort, "new_value x z",
"passing a hash to a sub expecting a hash behaves correctly (2)";
}
{
my sub foo (Hash $h) { $h<b> = "new_value" }
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
foo %hash;
is $var, "new_value",
"passing a hash to a sub expecting a hashref behaves correctly (1)";
#?pugs todo
is ~%hash.values.sort, "new_value x z",
"passing a hash to a sub expecting a hashref behaves correctly (2)";
}
# Binding of not yet existing elements should autovivify
{
my %hash;
my $var = "d";
lives_ok { %hash<b> := $var },
"binding of not yet existing elements should autovivify (1)";
is %hash<b>, "d", "binding of not yet existing elements should autovivify (2)";
$var = "e";
is %hash<b>, "e", "binding of not yet existing elements should autovivify (3)";
is $var, "e", "binding of not yet existing elements should autovivify (4)";
}
# Assignment (not binding) creates new containers
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
$var = "e";
is %hash<b>, "e", "hash assignment creates new containers (1)";
my %new_hash = %hash;
$var = "f";
# %hash<b> and $var are now "f", but %new_hash is unchanged.
is $var, "f", "hash assignment creates new containers (2)";
#?pugs todo
is ~%hash\ .values.sort, "f x z", "hash assignment creates new containers (3)";
#?pugs todo
is ~%new_hash.values.sort, "e x z", "hash assignment creates new containers (4)";
}
# Binding does not create new containers
{
my %hash = (:a<x>, :b<y>, :c<z>);
my $var = "d";
%hash<b> := $var;
$var = "e";
is %hash<b>, "e", "hash binding does not create new containers (1)";
my %new_hash := %hash;
$var = "f";
# %hash<b> and $var are now "f", but %new_hash is unchanged.
is $var, "f", "hash binding does not create new containers (2)";
#?pugs todo
is ~%hash\ .values.sort, "f x z", "hash binding does not create new containers (3)";
#?pugs todo
is ~%new_hash.values.sort, "f x z", "hash binding does not create new containers (4)";
}
# Binding %hash := $hashref.
# See
# http://colabti.de/irclogger/irclogger_log/perl6?date=2005-11-06,Sun&sel=388#l564
# and consider the magic behind parameter binding (which is really normal
# binding).
{
my $hashref = { a => "a", b => "b" };
my %hash := $hashref;
is +%hash, 2, 'binding %hash := $hashref works (1)';
%hash<b> = "c";
is ~$hashref.values.sort, "a c", 'binding %hash := $hashref works (2)';
is ~%hash\ .values.sort, "a c", 'binding %hash := $hashref works (3)';
}
#?pugs todo
eval_dies_ok 'my %h = a => 1, b => 2; %h<a b> := (4, 5)',
'Cannot bind to hash slices';
# vim: ft=perl6
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