my @flat = flatten '\@$;$', @args; # ('a', 'b', 'c', 1, { d => 2 })
recall 'CORE::push', @args; # @a contains 'a', 'b', 'c', 1, { d => 2 }, undef, 3
- my $splice = wrap 'CORE::splice', compile => 1;
+ my $splice = wrap 'CORE::splice';
my @b = $splice->(\@a, 4, 2); # @a is now ('a', 'b', 'c', 1, 3) and @b is ({ d => 2 }, undef)
=head1 DESCRIPTION
Generates a wrapper that calls the function C<$name> with a prototyped argument list. That is, the wrapper's arguments should be what C<@_> is when you define a subroutine with the same prototype as C<$name>.
my $a = [ 0 .. 2 ];
- my $push = wrap 'CORE::push', compile => 1;
+ my $push = wrap 'CORE::push';
$push->($a, 3, 4); # returns 3 + 2 = 5 and $a now contains 0 .. 4
You can force the use of a specific prototype. In this case, C<$name> must be a hash reference that holds exactly one key / value pair, the key being the function name and the value the prototpye that should be used to call it.
- my $push = wrap { 'CORE::push' => '\@$' }, compile => 1; # only pushes 1 arg
+ my $push = wrap { 'CORE::push' => '\@$' }; # only pushes 1 arg
Others arguments are seen as key / value pairs that are meant to tune the code generated by L</wrap>. Valid keys are :
=item C<< compile => $bool >>
-Makes L</wrap> compile the code generated and return the resulting code reference. Implies C<< sub => 1 >>. Be careful that in this case C<ref> must be a fully qualified function name. Defaults to false.
+Makes L</wrap> compile the code generated and return the resulting code reference. Be careful that in this case C<ref> must be a fully qualified function name. Defaults to true, but turned off when C<sub> is false.
=back
For example, this allows you to recall into C<CORE::grep> and C<CORE::map> by using the C<\&@> prototype :
- my $grep = wrap { 'CORE::grep' => '\&@' }, compile => 1;
+ my $grep = wrap { 'CORE::grep' => '\&@' };
sub mygrep (&@) { $grep->(@_) } # the prototypes are intentionally different
=cut
croak 'Optional arguments must be passed as key => value pairs' if @_ % 2;
my %opts = @_;
$opts{ref} ||= 'ref';
- $opts{sub} = 1 if not exists $opts{sub} or $opts{compile};
+ $opts{sub} = 1 if not defined $opts{sub};
+ $opts{compile} = 1 if not defined $opts{compile} and $opts{sub};
$opts{wrong_ref} = 'undef' if not defined $opts{wrong_ref};
my @cr;
my $call;
=cut
sub recall {
- my $wrap = eval { wrap shift, compile => 1 };
+ my $wrap = eval { wrap shift };
croak $@ if $@;
return $wrap->(@_);
}
recall 'CORE::push', @args; # @a contains 'a', 'b', 'c', 1, { d => 2 }, undef, 3
print "After recalling CORE::push with \@args, \@a contains :\n", Dumper(\@a);
-my $splice = wrap 'CORE::splice', compile => 1;
+my $splice = wrap 'CORE::splice';
my @b = $splice->(\@a, 4, 2);
print "After calling wrapped splice with \@a, it contains :\n", Dumper(\@a);
print "What was returned :\n", Dumper(\@b);
like($@, qr/^Optional\s+arguments/, 'recall takes options in a key => value list');
my $push_exp = '{ CORE::push(@{$_[0]}, @_[1..$#_]) }';
-my $push = wrap 'CORE::push';
+my $push = wrap 'CORE::push', compile => 0;
is($push, 'sub ' . $push_exp, 'wrap push as a sub (default)');
-$push = wrap 'CORE::push', sub => 1;
+$push = wrap 'CORE::push', sub => 1, compile => 0;
is($push, 'sub ' . $push_exp, 'wrap push as a sub');
$push = wrap 'CORE::push', sub => 0;
is($push, $push_exp, 'wrap push as a raw string');
-$push = wrap 'CORE::push', compile => 1;
+$push = wrap 'CORE::push';
is(ref $push, 'CODE', 'wrap compiled push is a CODE reference');
my @a = qw/a b/;
my $ret = $push->(\@a, 7 .. 12);
is_deeply(\@a, [ qw/a b/, 7 .. 12 ], 'wrap compiled push works');
is($ret, 8, 'wrap compiled push returns the correct number of elements');
-my $push2 = wrap { 'CORE::push' => '\@;$' }, compile => 1;
+my $push2 = wrap { 'CORE::push' => '\@;$' };
is(ref $push2, 'CODE', 'wrap compiled truncated push is a CODE reference');
@a = qw/x y z/;
$ret = $push2->(\@a, 3 .. 5);
skip 'perl 5.8.x is needed to test execution of \[$@] prototypes' => 6
if $^V lt v5.8.0;
- my $cat = wrap 'main::cat', ref => 'main::myref', wrong_ref => 'die "hlagh"',
- sub => 1, compile => 1;
+ my $cat = wrap 'main::cat', ref => 'main::myref',
+ sub => 1,
+ wrong_ref => 'die "hlagh"',
my @tests = (
[ \'a', \'b', [ 'ab' ], 'scalar-scalar' ],
[ \'c', [ qw/d e/ ], [ qw/c d e/ ], 'scalar-array' ],
sub myit { my $ar = shift; push @$ar, @_; };
if ($^V ge v5.10.0) {
set_prototype \&myit, '\@$_';
- my $it = wrap 'main::myit', compile => 1;
+ my $it = wrap 'main::myit';
my @a = qw/u v w/;
local $_ = 7;
$it->(\@a, 3, 4, 5);
is_deeply(\@a, [ qw/u v w/, 3, 4, 6, 7 ], '_ without arguments');
}
-eval { wrap { 'main::dummy' => '\[@%]' }, ref => 'shift', compile => 1 };
+eval { wrap { 'main::dummy' => '\[@%]' }, ref => 'shift' };
like($@, qr/to\s+shift\s+must\s+be\s+array/, 'invalid eval code croaks');