implement custom per-keyword type reification

[p5sagit/Function-Parameters.git] / t / types_custom_2.t

diff --git a/t/types_custom_2.t b/t/types_custom_2.t
new file mode 100644 (file)
index 0000000..f22ae0e
--- /dev/null
+++ b/t/types_custom_2.t
@@ -0,0 +1,61 @@
+#!perl
+use warnings FATAL => 'all';
+use strict;
+
+use Test::More tests => 4;
+use Test::Fatal;
+
+{
+       package MyTC;
+
+       use Function::Parameters qw(:strict);
+
+       method new(
+               $class:
+               $name,
+               $check,
+               $get_message = fun ($value) {
+                       "Validation failed for constraint '$name' with value '$value'"
+               },
+       ) {
+               bless {
+                       name => $name,
+                       check => $check,
+                       get_message => $get_message,
+               }, $class
+       }
+
+       method check($value) {
+               $self->{check}($value)
+       }
+
+       method get_message($value) {
+               $self->{get_message}($value)
+       }
+}
+
+use Function::Parameters do {
+       use Function::Parameters qw(:strict);
+
+       my %Types = (
+               TEvenNum  => MyTC->new('even number'  => fun ($n) { $n =~ /^[0-9]+\z/ && $n % 2 == 0 }),
+               TShortStr => MyTC->new('short string' => fun ($s) { length($s) < 10 }),
+               Any       => MyTC->new('any value'    => fun ($a) { 1 }),
+       );
+       +{
+               fun => {
+                       check_argument_count => 1,
+                       types => 1,
+                       reify_type => sub { $Types{ $_[0] } || $Types{Any} },
+               },
+       }
+};
+
+fun foo(TEvenNum $x, TShortStr $y) {
+       "$x/$y"
+}
+
+is foo(42, "hello"), "42/hello";
+like exception { foo 41, "hello" },       qr{\bValidation failed for constraint 'even number' with value '41'};
+like exception { foo 42, "1234567890~" }, qr{\bValidation failed for constraint 'short string' with value '1234567890~'};
+like exception { foo 41, "1234567890~" }, qr{\bValidation failed for constraint 'even number' with value '41'};