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package Dallycot::AST::Assign; |
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our $AUTHORITY = 'cpan:JSMITH'; |
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# ABSTRACT: Store result of expression in environment |
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12111
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use strict; |
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719
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85
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use warnings; |
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491
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use utf8; |
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96
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504
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use parent 'Dallycot::AST'; |
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1276
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use Promises qw(deferred); |
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126
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sub to_string { |
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0
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my ($self) = @_; |
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0
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return $self->[0] . " := " . $self->[1]->to_string; |
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} |
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sub is_declarative { return 1 } |
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sub identifier { |
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3155
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my ($self) = @_; |
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return $self->[0]; |
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} |
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sub simplify { |
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my ($self) = @_; |
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return bless [ $self -> [0], $self -> [1] -> simplify ] => __PACKAGE__; |
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} |
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sub to_rdf { |
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my($self, $model) = @_; |
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my $bnode = $self->[1]->to_rdf($model); |
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0
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$model -> add_symbol($self->[0], $bnode); |
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0
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return $bnode; |
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} |
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sub execute { |
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my ( $self, $engine ) = @_; |
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my $d = deferred; |
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0
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my $registry = Dallycot::Registry->instance; |
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0
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0
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if ( $registry->has_assignment( '', $self->[0] ) ) { |
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$d = $registry->get_assignment( '', $self->[0] ); |
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0
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if ( $d->is_resolved ) { |
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$d = deferred; |
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$d->reject('Core definitions may not be redefined.'); |
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return $d->promise; |
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} |
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} |
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elsif ( $engine->has_assignment( $self->[0] ) ) { |
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0
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$d = $engine->get_assignment( $self->[0] ); |
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0
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0
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if ( $d->is_resolved ) { |
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$d = deferred; |
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0
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$d->reject( 'Unable to redefine ' . $self->[0] ); |
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return $d->promise; |
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} |
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} |
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else { |
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0
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$d = $engine->add_assignment( $self->[0] ); |
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} |
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71
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$engine->execute( $self->[1] )->done( |
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sub { |
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0
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0
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my ($result) = @_; |
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0
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my $worked = eval { |
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$engine->add_assignment( $self->[0], $result ); |
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0
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1; |
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}; |
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0
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0
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if ($@) { |
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0
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0
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$d->reject($@); |
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} |
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elsif ( !$worked ) { |
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0
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$d->reject( "Unable to assign to " . $self->[0] ); |
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} |
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else { |
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0
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$d->resolve($result); |
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} |
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}, |
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sub { |
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0
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0
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$d->reject(@_); |
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} |
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0
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); |
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0
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return $d->promise; |
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} |
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96
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1; |