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package Dallycot::AST::Index; |
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our $AUTHORITY = 'cpan:JSMITH'; |
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# ABSTRACT: Select value at given index in collection-like value |
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12330
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use strict; |
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731
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use warnings; |
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use utf8; |
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103
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467
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use parent 'Dallycot::AST'; |
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1191
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use Promises qw(deferred); |
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sub to_rdf { |
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my($self, $model) = @_; |
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0
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my @exprs = @$self; |
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0
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my $node = $model -> apply( |
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$model -> meta_uri('loc:index'), |
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[ $exprs[0], $exprs[1] ] |
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); |
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shift @exprs; shift @exprs; |
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while(@exprs) { |
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$node = $model -> apply( |
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$model -> meta_uri('loc:index'), |
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[ $node, shift @exprs ] |
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); |
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} |
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0
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return $node; |
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} |
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sub execute { |
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my ( $self, $engine ) = @_; |
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my $d = deferred; |
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my @expressions = @$self; |
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if (@expressions) { |
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$engine->execute( shift @expressions )->done( |
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sub { |
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my ($root) = @_; |
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$self->_do_next_index( |
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$engine, $d, |
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root => $root, |
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indices => \@expressions |
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); |
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}, |
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sub { |
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$d->reject(@_); |
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} |
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); |
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} |
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else { |
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$d->reject('missing expressions'); |
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} |
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0
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return $d->promise; |
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} |
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sub _do_next_index { |
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my ( $self, $engine, $d, %state ) = @_; |
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my ( $root, $index_expr, @indices ) |
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= ( $state{root}, @{ $state{indices} || [] } ); |
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0
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if ($index_expr) { |
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$engine->execute($index_expr)->done( |
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sub { |
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0
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my ($index) = @_; |
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0
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if ( $index->isa('Dallycot::Value::Numeric') ) { |
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$index = $index->value; |
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} |
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else { |
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$d->reject("Vector indices must be numeric"); |
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0
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return; |
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} |
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$root->value_at( $engine, $index )->done( |
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sub { |
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0
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$self->_do_next_index( |
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$engine, $d, |
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root => $_[0], |
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indices => \@indices |
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); |
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}, |
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sub { |
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$d->reject(@_); |
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} |
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); |
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}, |
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sub { |
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0
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$d->reject(@_); |
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} |
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0
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); |
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} |
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else { |
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0
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$d->resolve($root); |
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} |
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104
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0
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return; |
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} |
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1; |