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package Dallycot::Value::OpenRange; |
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our $AUTHORITY = 'cpan:JSMITH'; |
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# ABSTRACT: An open range (semi-infinite) of integers |
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13260
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use strict; |
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773
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use warnings; |
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534
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# No RDF equivalent - continuous list generation of items |
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use utf8; |
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122
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use parent 'Dallycot::Value::Collection'; |
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1420
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use Promises qw(deferred); |
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225
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sub _type { return 'Range' } |
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sub as_text { |
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my ($self) = @_; |
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return $self->[0]->as_text . ".."; |
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} |
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sub is_empty {return} |
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sub calculate_length { |
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my ( $self, $engine ) = @_; |
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return Dallycot::Value::Numeric->new( Math::BigRat->binf() ); |
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} |
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sub head { |
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my ($self) = @_; |
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my $d = deferred; |
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$d->resolve( $self->[0] ); |
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return $d->promise; |
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} |
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sub tail { |
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my ($self) = @_; |
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return $self->[0]->successor->then( |
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sub { |
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0
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my ($next) = @_; |
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49
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0
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bless [$next] => __PACKAGE__; |
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} |
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0
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); |
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} |
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54
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sub _walk_tail { |
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my ( $self, $engine, $d, $count ) = @_; |
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if ( $count > 0 ) { |
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$self->tail($engine)->done( |
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sub { |
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my ($tail) = @_; |
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$tail->_walk_tail( $engine, $d, $count - 1 ); |
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}, |
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sub { |
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$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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$self->head($engine)->done( |
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sub { |
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0
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$d -> resolve(@_); |
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}, |
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sub { |
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0
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0
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$d -> reject(@_); |
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} |
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0
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); |
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} |
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} |
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80
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sub apply_map { |
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my ( $self, $engine, $transform ) = @_; |
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83
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return $engine->make_map($transform)->then( |
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sub { |
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0
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my ($map_t) = @_; |
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0
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return $map_t->apply( $engine, {}, $self ); |
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} |
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0
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); |
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} |
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sub apply_filter { |
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my ( $self, $engine, $filter ) = @_; |
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95
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return $engine->make_filter($filter)->then( |
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sub { |
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0
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my ($filter_t) = @_; |
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0
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$filter_t->apply( $engine, {}, $self ); |
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} |
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0
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); |
102
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} |
103
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104
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1; |