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package Dallycot::AST::Fetch; |
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our $AUTHORITY = 'cpan:JSMITH'; |
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4
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# ABSTRACT: Find the value associated with an identifier |
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15249
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use strict; |
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805
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use warnings; |
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609
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use utf8; |
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132
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457
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use parent 'Dallycot::AST'; |
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9260
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use Dallycot::Util qw(maybe_promise); |
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1148
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113
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use Promises qw(deferred); |
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416
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3789
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use Scalar::Util qw(blessed); |
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11844
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sub new { |
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my ( $class, $identifier ) = @_; |
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$class = ref $class || $class; |
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return bless [$identifier] => $class; |
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} |
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sub to_rdf { |
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my($self, $model) = @_; |
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my $label; |
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if(@$self > 1) { |
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# need namespace resolution |
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my $uri = $model -> uri(join(":", @$self)); |
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return $uri if blessed $uri; |
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} |
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else { |
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$label = $self->[0]; |
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} |
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my $val = $model -> fetch_symbol($label); |
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return $val if blessed $val; |
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my $bnode = $model -> bnode; |
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$model -> add_type($bnode, 'loc:BindingReference'); |
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$model -> add_label($bnode, $label); |
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return $bnode; |
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} |
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sub identifiers { |
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2
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2
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603
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my ($self) = @_; |
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2
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if ( @{$self} == 1 ) { |
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return $self->[0]; |
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} |
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else { |
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0
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return [ @{$self} ]; |
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} |
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} |
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sub to_string { |
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0
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my ($self) = @_; |
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0
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return $self->[0]; |
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} |
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65
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sub execute { |
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my ( $self, $engine ) = @_; |
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my $registry = Dallycot::Registry->instance; |
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0
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if ( @$self > 1 ) { |
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0
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0
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if ( $engine->has_namespace( $self->[0] ) ) { |
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my $ns = $engine->get_namespace( $self->[0] ); |
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if ( $registry->has_namespace($ns) ) { |
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if ( $registry->has_assignment( $ns, $self->[1] ) ) { |
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return maybe_promise( $registry->get_assignment( $ns, $self->[1] ) ); |
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} |
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else { |
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0
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my $d = deferred; |
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0
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$d->reject( join( ":", @$self ) . " is undefined." ); |
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0
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return $d->promise; |
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} |
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} |
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else { |
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0
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my $d = deferred; |
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0
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$d->reject("The namespace \"$ns\" is unregistered."); |
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0
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return $d->promise; |
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} |
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} |
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else { |
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0
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my $d = deferred; |
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0
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$d->reject("The namespace prefix \"@{[$self->[0]]}\" is undefined."); |
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0
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return $d->promise; |
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} |
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} |
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elsif ( $engine->has_assignment( $self->[0] ) ) { |
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0
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return maybe_promise( $engine->get_assignment( $self->[0] ) ); |
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} |
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elsif ( $registry->has_assignment( $engine->get_namespace_search_path, $self->[0] ) ) { |
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0
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return maybe_promise( $registry->get_assignment( $engine->get_namespace_search_path, $self->[0] ) ); |
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} |
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else { |
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0
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my $d = deferred; |
102
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0
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$d->reject( $self->[0] . " is undefined." ); |
103
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0
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return $d->promise; |
104
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} |
105
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} |
106
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107
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1; |