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|
# INTERNAL MODULE: OO backend for Type::Params multisig-type signatures.
package Type::Params::Alternatives;
use 5.008001;
use strict;
use warnings;
BEGIN {
if ( $] < 5.010 ) { require Devel::TypeTiny::Perl58Compat }
}
BEGIN {
$Type::Params::Alternatives::AUTHORITY = 'cpan:TOBYINK';
$Type::Params::Alternatives::VERSION = '2.002001';
}
$Type::Params::Alternatives::VERSION =~ tr/_//d;
use B ();
use Eval::TypeTiny::CodeAccumulator;
use Types::Standard qw( -is -types -assert );
use Types::TypeTiny qw( -is -types to_TypeTiny );
require Type::Params::Signature;
our @ISA = 'Type::Params::Signature';
sub new {
my $class = shift;
my %self = @_ == 1 ? %{$_[0]} : @_;
my $self = bless \%self, $class;
exists( $self->{$_} ) || ( $self->{$_} = $self->{base_options}{$_} )
for keys %{ $self->{base_options} };
$self->{sig_class} ||= 'Type::Params::Signature';
$self->{message} ||= 'Parameter validation failed';
return $self;
}
sub base_options { $_[0]{base_options} ||= {} }
sub alternatives { $_[0]{alternatives} ||= [] }
sub sig_class { $_[0]{sig_class} }
sub meta_alternatives { $_[0]{meta_alternatives} ||= $_[0]->_build_meta_alternatives }
sub parameters { [] }
sub goto_next { $_[0]{base_options}{goto_next} }
sub package { $_[0]{base_options}{package} }
sub subname { $_[0]{base_options}{subname} }
sub _build_meta_alternatives {
my $self = shift;
my $index = 0;
return [
map {
my $meta = $self->_build_meta_alternative( $_ );
$meta->{_index} = $index++;
$meta;
} @{ $self->alternatives }
];
}
sub _build_meta_alternative {
my ( $self, $alt ) = @_;
if ( is_CodeRef $alt ) {
return { closure => $alt };
}
elsif ( is_HashRef $alt ) {
my %opts = (
%{ $self->base_options },
goto_next => !!0, # don't propagate
%$alt,
want_source => !!0,
want_object => !!0,
want_details => !!1,
);
my $sig = $self->sig_class->new_from_v2api( \%opts );
return $sig->return_wanted;
}
elsif ( is_ArrayRef $alt ) {
my %opts = (
%{ $self->base_options },
goto_next => !!0, # don't propagate
positional => $alt,
want_source => !!0,
want_object => !!0,
want_details => !!1,
);
my $sig = $self->sig_class->new_from_v2api( \%opts );
return $sig->return_wanted;
}
else {
$self->_croak( 'Alternative signatures must be CODE, HASH, or ARRAY refs' );
}
}
sub _coderef_start_extra {
my ( $self, $coderef ) = ( shift, @_ );
$coderef->add_line( 'my $r;' );
$coderef->add_line( 'undef ${^TYPE_PARAMS_MULTISIG};' );
$coderef->add_line( 'undef ${^_TYPE_PARAMS_MULTISIG};' );
$coderef->add_gap;
for my $meta ( @{ $self->meta_alternatives } ) {
$self->_coderef_meta_alternative( $coderef, $meta );
}
$self;
}
sub _coderef_meta_alternative {
my ( $self, $coderef, $meta ) = ( shift, @_ );
my @cond = '! $r';
push @cond, sprintf( '@_ >= %s', $meta->{min_args} ) if defined $meta->{min_args};
push @cond, sprintf( '@_ <= %s', $meta->{max_args} ) if defined $meta->{max_args};
if ( defined $meta->{max_args} and defined $meta->{min_args} ) {
splice @cond, -2, 2, sprintf( '@_ == %s', $meta->{min_args} )
if $meta->{max_args} == $meta->{min_args};
}
# It is sometimes possible to inline $meta->{source} here
if ( $meta->{source}
and $meta->{source} !~ /return/
and ! keys %{ $meta->{environment} } ) {
my $alt_code = $meta->{source};
$alt_code =~ s/^sub [{]/do {/;
$coderef->add_line( sprintf(
'eval { local @_ = @_; $r = [ %s ]; ${^TYPE_PARAMS_MULTISIG} = ${^_TYPE_PARAMS_MULTISIG} = %d }%sif ( %s );',
$alt_code,
$meta->{_index},
"\n\t",
join( ' and ', @cond ),
) );
$coderef->add_gap;
}
else {
my $callback_var = $coderef->add_variable( '$signature', \$meta->{closure} );
$coderef->add_line( sprintf(
'eval { $r = [ %s->(@_) ]; ${^TYPE_PARAMS_MULTISIG} = ${^_TYPE_PARAMS_MULTISIG} = %d }%sif ( %s );',
$callback_var,
$meta->{_index},
"\n\t",
join( ' and ', @cond ),
) );
$coderef->add_gap;
}
return $self;
}
sub _coderef_end_extra {
my ( $self, $coderef ) = ( shift, @_ );
$coderef->add_line( sprintf(
'%s unless $r;',
$self->_make_general_fail( message => B::perlstring( $self->{message} ) ),
) );
$coderef->add_gap;
return $self;
}
sub _coderef_check_count {
shift;
}
sub _make_return_list {
'@$r';
}
sub make_class_pp_code {
my $self = shift;
return join(
qq{\n},
grep { length $_ }
map { $_->{class_definition} || '' }
@{ $self->meta_alternatives }
);
}
1;
|
