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Exception.pm
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Exception.pm
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package TryCatch::Exception;
use Moose;
use MooseX::Types::Moose qw/CodeRef ArrayRef/;
use Scope::Upper qw/unwind want_at :words/;
use namespace::clean -except => 'meta';
has try => (
is => 'ro',
isa => CodeRef,
required => 1
);
has catches => (
is => 'ro',
isa => ArrayRef[ArrayRef[CodeRef]],
default => sub { [] }
);
has ctx => (
is => 'ro',
required => 1
);
our $CTX;
sub _run_block {
my ($self, $code) = @_;
my $wa = want_at $CTX;
if ($wa) {
my @ret = $code->();
} elsif (defined $wa) {
my $ret = $code->();
} else {
$code->();
}
}
sub run {
my ($self) = @_;
local $CTX = $CTX;
my $ctx = $CTX;
unless (defined $CTX) {
$CTX = $ctx = $self->ctx;
}
local $@;
eval {
$self->_run_block($self->try);
};
# If we get here there was either no explicit return or an error
return unless defined($@);
my $err = $@;
CATCH: for my $catch ( @{$self->catches} ) {
my $sub = pop @$catch;
for my $cond (@$catch) {
if (ref $cond) {
local *_ = \$err;
next CATCH unless $cond->();
}
else {
my $tc = TryCatch->get_tc($cond);
next CATCH unless $tc->check($err);
}
}
$self->_run_block($sub);
}
return;
}
sub catch {
my ($self, @conds) = @_;
push @{$self->catches}, [@conds];
return $self;
}
__PACKAGE__->meta->make_immutable;
1;