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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2012-2021 -- leonerd@leonerd.org.uk |
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use v5.26; |
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use Object::Pad 0.41; |
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package Tangence::Meta::Type 0.28; |
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class Tangence::Meta::Type :strict(params); |
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use Carp; |
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=head1 NAME |
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C - structure representing one C value type |
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=head1 DESCRIPTION |
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This data structure object represents information about a type, such as a |
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method or event argument, a method return value, or a property element type. |
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Due to their simple contents and immutable nature, these objects may be |
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implemented as singletons. Repeated calls to the constructor method for the |
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same type name will yield the same instance. |
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=cut |
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=head1 CONSTRUCTOR |
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=cut |
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=head2 make |
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$type = Tangence::Meta::Type->make( $primitive ) |
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Returns an instance to represent the given primitive type signature. |
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$type = Tangence::Meta::Type->make( $aggregate => $member_type ) |
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Returns an instance to represent the given aggregation of the given type |
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instance. |
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=cut |
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our %PRIMITIVES; |
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our %LISTS; |
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our %DICTS; |
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sub make |
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{ |
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my $class = shift; |
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if( @_ == 1 ) { |
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my ( $sig ) = @_; |
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return $PRIMITIVES{$sig} //= |
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$class->new( member_type => $sig ); |
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} |
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elsif( @_ == 2 and $_[0] eq "list" ) { |
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my ( undef, $membertype ) = @_; |
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return $LISTS{$membertype->sig} //= |
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$class->new( aggregate => "list", member_type => $membertype ); |
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} |
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elsif( @_ == 2 and $_[0] eq "dict" ) { |
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my ( undef, $membertype ) = @_; |
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return $DICTS{$membertype->sig} //= |
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$class->new( aggregate => "dict", member_type => $membertype ); |
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} |
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die "TODO: @_"; |
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} |
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=head2 make _from_sig |
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$type = Tangence::Meta::Type->make_from_sig( $sig ) |
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Parses the given full Tangence type signature and returns an instance to |
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represent it. |
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=cut |
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sub make_from_sig ( $class, $sig ) |
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{ |
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$sig =~ m/^list\((.*)\)$/ and |
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return $class->make( list => $class->make_from_sig( $1 ) ); |
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$sig =~ m/^dict\((.*)\)$/ and |
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return $class->make( dict => $class->make_from_sig( $1 ) ); |
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return $class->make( $sig ); |
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} |
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has $aggregate :param :reader = "prim"; |
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has $member_type :param; |
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=head1 ACCESSORS |
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=cut |
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=head2 aggregate |
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$agg = $type->aggregate |
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Returns C<"prim"> for primitive types, or the aggregation name for list and |
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dict aggregate types. |
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=cut |
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=head2 member_type |
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$member_type = $type->member_type |
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Returns the member type for aggregation types. Throws an exception for |
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primitive types. |
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=cut |
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method member_type |
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{ |
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die "Cannot return the member type for primitive types" if $aggregate eq "prim"; |
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return $member_type; |
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} |
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=head2 sig |
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$sig = $type->sig |
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Returns the Tangence type signature for the type. |
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=cut |
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method sig |
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{ |
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return $self->${\"_sig_for_$aggregate"}(); |
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} |
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method _sig_for_prim |
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{ |
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return $member_type; |
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} |
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method _sig_for_list |
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{ |
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return "list(" . $member_type->sig . ")"; |
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} |
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method _sig_for_dict |
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{ |
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return "dict(" . $member_type->sig . ")"; |
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} |
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=head1 AUTHOR |
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Paul Evans |
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=cut |
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0x55AA; |