fix scoping of named parameters

[p5sagit/Function-Parameters.git] / t / recursion.t

diff --git a/t/recursion.t b/t/recursion.t
new file mode 100644 (file)
index 0000000..f9d5750
--- /dev/null
+++ b/t/recursion.t
@@ -0,0 +1,95 @@
+#!perl
+use warnings FATAL => 'all';
+use strict;
+
+use Test::More tests => 26;
+
+use Function::Parameters qw(:strict);
+
+fun foo_r($depth, $fst, $snd) {
+       return [$fst, $snd, $snd - $fst] if $depth <= 0;
+       $fst++;
+       my $thd = foo_r $depth - 1, $fst + $snd, $fst * $snd;
+       $snd++;
+       return [$fst, $snd, $thd];
+}
+
+fun foo_o($depth, $fst = 1, $snd = 2) {
+       return [$fst, $snd, $snd - $fst] if $depth <= 0;
+       $fst++;
+       my $thd = foo_o $depth - 1, $fst + $snd, $fst * $snd;
+       $snd++;
+       return [$fst, $snd, $thd];
+}
+
+fun foo_nr(:$depth, :$fst, :$snd) {
+       return [$fst, $snd, $snd - $fst] if $depth <= 0;
+       $fst++;
+       my $thd = foo_nr snd => $fst * $snd, depth => $depth - 1, fst => $fst + $snd;
+       $snd++;
+       return [$fst, $snd, $thd];
+}
+
+fun foo_no(:$depth, :$fst = 1, :$snd = 2) {
+       return [$fst, $snd, $snd - $fst] if $depth <= 0;
+       $fst++;
+       my $thd = foo_no snd => $fst * $snd, depth => $depth - 1, fst => $fst + $snd;
+       $snd++;
+       return [$fst, $snd, $thd];
+}
+
+for my $f (
+       \&foo_r, \&foo_o,
+       map { my $f = $_; fun ($d, $x, $y) { $f->(depth => $d, snd => $y, fst => $x) } }
+       \&foo_nr, \&foo_no
+) {
+       is_deeply $f->(0, 3, 5), [3, 5, 2];
+       is_deeply $f->(1, 3, 5), [4, 6, [9, 20, 11]];
+       is_deeply $f->(2, 3, 5), [4, 6, [10, 21, [30, 200, 170]]];
+}
+
+fun slurpy(:$n, %rest) { [$n, \%rest] }
+
+{
+       is_deeply slurpy(a => 1, b => 2, n => 9), [9, {a => 1, b => 2}];
+       my $sav1 = slurpy(n => 5);
+       is_deeply $sav1, [5, {}];
+       my $sav2 = slurpy(n => 6, a => 3);
+       is_deeply $sav2, [6, {a => 3}];
+       is_deeply $sav1, [5, {}];
+       is_deeply slurpy(b => 4, n => 7, hello => "world"), [7, {hello => "world", b => 4}];
+       is_deeply $sav1, [5, {}];
+       is_deeply $sav2, [6, {a => 3}];
+}
+
+{
+       {
+               package TimelyDestruction;
+
+               method new($class: $f) {
+                       bless {on_destroy => $f}, $class
+               }
+
+               method DESTROY {
+                       $self->{on_destroy}();
+               }
+       }
+
+       use Function::Parameters; # lax
+
+       fun bar(:$n) { defined $n ? $n + 1 : "nope" }
+
+       is bar(n => undef), "nope";
+       is bar(n => 2), 3;
+       is bar, "nope";
+
+       my $dead = 0;
+       {
+               my $o = TimelyDestruction->new(fun () { $dead++ });
+               is bar(n => $o), $o + 1, "this juice is bangin yo";
+       }
+       is $dead, 1;
+       $dead = 999;
+       is bar(n => 3), 4;
+       is $dead, 999;
+}