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stmt |
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package Dallycot::Value::Stream; |
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our $AUTHORITY = 'cpan:JSMITH'; |
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4
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# ABSTRACT: A linked list of values with a possible generator |
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23
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14611
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use strict; |
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23
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764
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23
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23
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98
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use warnings; |
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49
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23
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505
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8
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9
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# RDF List |
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use utf8; |
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29
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23
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102
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11912
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use Readonly; |
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58379
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23
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1993
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Readonly my $HEAD => 0; |
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Readonly my $TAIL => 1; |
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Readonly my $TAIL_PROMISE => 2; |
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17
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23
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23
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146
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use parent 'Dallycot::Value::Collection'; |
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140
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926
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use experimental qw(switch); |
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159
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3028
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use Promises qw(deferred); |
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1516
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92
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22
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sub new { |
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0
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0
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0
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my ( $class, $head, $tail, $promise ) = @_; |
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0
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0
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$class = ref $class || $class; |
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0
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return bless [ $head, $tail, $promise ] => $class; |
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} |
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29
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0
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0
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sub is_defined { return 1 } |
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31
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0
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0
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0
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sub is_empty {return} |
32
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33
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sub to_rdf { |
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0
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0
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0
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my($self, $model) = @_; |
35
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36
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0
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my @things; |
37
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0
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my $root = $self; |
38
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0
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push @things, $root -> [0]->to_rdf($model); |
39
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0
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while($root -> [1]) { |
40
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0
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$root = $root->[1]; |
41
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0
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push @things, $root->[0]->to_rdf($model); |
42
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} |
43
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0
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0
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if($root -> [2]) { |
44
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0
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return $model -> list_with_promise(@things, $root->[2]); |
45
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} |
46
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else { |
47
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0
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return $model -> list(@things); |
48
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} |
49
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} |
50
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51
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sub prepend { |
52
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0
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0
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0
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my ( $self, @things ) = @_; |
53
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54
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0
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my $stream = $self; |
55
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56
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0
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foreach my $thing (@things) { |
57
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0
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$stream = __PACKAGE__->new( $thing, $stream ); |
58
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} |
59
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0
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return $stream; |
60
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} |
61
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62
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sub as_text { |
63
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0
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0
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0
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my ($self) = @_; |
64
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65
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0
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my $text = "[ "; |
66
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0
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my $point = $self; |
67
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0
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$text .= $point->[$HEAD]->as_text; |
68
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0
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while ( defined $point->[$TAIL] ) { |
69
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0
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$point = $point->[$TAIL]; |
70
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0
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0
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if ( defined $point->[$HEAD] ) { |
71
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0
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$text .= ", "; |
72
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0
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$text .= $point->[$HEAD]->as_text; |
73
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} |
74
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} |
75
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0
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0
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if ( defined $point->[$TAIL_PROMISE] ) { |
76
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0
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$text .= ", ..."; |
77
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} |
78
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0
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return $text . " ]"; |
79
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} |
80
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81
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sub calculate_length { |
82
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0
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0
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0
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my ( $self, $engine ) = @_; |
83
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84
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0
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my $d = deferred; |
85
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86
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0
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my $ptr = $self; |
87
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88
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0
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my $count = 1; |
89
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90
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0
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while ( $ptr->[$TAIL] ) { |
91
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0
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$count++; |
92
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0
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$ptr = $ptr->[$TAIL]; |
93
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} |
94
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95
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0
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0
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if ( $ptr->[$TAIL_PROMISE] ) { |
96
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0
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$d->resolve( Dallycot::Value::Numeric->new( Math::BigRat->binf() ) ); |
97
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} |
98
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else { |
99
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0
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$d->resolve( Dallycot::Value::Numeric->new($count) ); |
100
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} |
101
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102
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0
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return $d->promise; |
103
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} |
104
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105
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sub _resolve_tail_promise { |
106
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0
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0
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my ( $self, $engine ) = @_; |
107
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108
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return $self->[$TAIL_PROMISE]->apply( $engine, {} )->then( |
109
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sub { |
110
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0
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0
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my ($list_tail) = @_; |
111
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0
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given ( ref $list_tail ) { |
112
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0
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when (__PACKAGE__) { |
113
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0
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$self->[$TAIL] = $list_tail; |
114
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0
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$self->[$TAIL_PROMISE] = undef; |
115
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} |
116
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0
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when ('Dallycot::Value::Vector') { |
117
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118
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# convert finite vector into linked list |
119
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0
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my @values = @$list_tail; |
120
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0
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my $point = $self; |
121
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0
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while (@values) { |
122
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0
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$point->[$TAIL] = $self->new( shift @values ); |
123
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0
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$point = $point->[$TAIL]; |
124
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} |
125
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} |
126
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0
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default { |
127
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0
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$self->[$TAIL] = $list_tail; |
128
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0
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$self->[$TAIL_PROMISE] = undef; |
129
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} |
130
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} |
131
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} |
132
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0
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); |
133
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} |
134
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135
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sub apply_map { |
136
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0
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0
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0
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my ( $self, $engine, $transform ) = @_; |
137
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138
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return $engine->make_map($transform)->then( |
139
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sub { |
140
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0
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0
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my ($map_t) = @_; |
141
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142
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0
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$map_t->apply( $engine, {}, $self ); |
143
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} |
144
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0
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); |
145
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} |
146
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147
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sub apply_filter { |
148
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0
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0
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0
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my ( $self, $engine, $filter ) = @_; |
149
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150
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return $engine->make_filter($filter)->then( |
151
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sub { |
152
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0
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0
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my ($filter_t) = @_; |
153
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154
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0
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$filter_t->apply( $engine, {}, $self ); |
155
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} |
156
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0
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); |
157
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} |
158
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159
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sub drop { |
160
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0
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0
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0
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my ( $self, $engine ) = @_; |
161
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162
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0
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return; |
163
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} |
164
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165
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sub value_at { |
166
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0
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0
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0
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my ( $self, $engine, $index ) = @_; |
167
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168
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0
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0
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if ( $index == 1 ) { |
169
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0
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return $self->head($engine); |
170
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} |
171
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172
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0
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my $d = deferred; |
173
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174
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0
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0
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if ( $index < 1 ) { |
175
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0
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$d->resolve( $engine->UNDEFINED ); |
176
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} |
177
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else { |
178
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# we want to keep resolving tails until we get somewhere |
179
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0
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$self->_walk_tail( $engine, $d, $index - 1 ); |
180
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} |
181
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182
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0
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return $d->promise; |
183
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} |
184
|
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185
|
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sub _walk_tail { |
186
|
0
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0
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my ( $self, $engine, $d, $count ) = @_; |
187
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188
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0
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0
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if ( $count > 0 ) { |
189
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$self->tail($engine)->done( |
190
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sub { |
191
|
0
|
|
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0
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|
my ($tail) = @_; |
192
|
0
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|
$tail->_walk_tail( $engine, $d, $count - 1 ); |
193
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}, |
194
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sub { |
195
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0
|
|
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0
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|
|
$d->reject(@_); |
196
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|
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} |
197
|
0
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|
|
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); |
198
|
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} |
199
|
|
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|
else { |
200
|
|
|
|
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|
$self->head($engine)->done( |
201
|
|
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|
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sub { |
202
|
0
|
|
|
0
|
|
|
$d -> resolve(@_); |
203
|
|
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|
}, |
204
|
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sub { |
205
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0
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|
|
0
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|
|
$d -> reject(@_); |
206
|
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} |
207
|
0
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|
|
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); |
208
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} |
209
|
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} |
210
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211
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sub head { |
212
|
0
|
|
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0
|
0
|
|
my ( $self, $engine ) = @_; |
213
|
|
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214
|
0
|
|
|
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|
|
my $p = deferred; |
215
|
|
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|
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|
216
|
0
|
0
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|
|
|
|
if ( defined $self->[$HEAD] ) { |
217
|
0
|
|
|
|
|
|
$p->resolve( $self->[0] ); |
218
|
|
|
|
|
|
|
} |
219
|
|
|
|
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|
else { |
220
|
0
|
|
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|
|
|
$p->resolve( bless [] => 'Dallycot::Value::Undefined' ); |
221
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|
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|
} |
222
|
|
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223
|
0
|
|
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|
|
|
return $p->promise; |
224
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|
|
|
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|
|
} |
225
|
|
|
|
|
|
|
|
226
|
|
|
|
|
|
|
sub tail { |
227
|
0
|
|
|
0
|
0
|
|
my ( $self, $engine ) = @_; |
228
|
|
|
|
|
|
|
|
229
|
0
|
|
|
|
|
|
my $p = deferred; |
230
|
|
|
|
|
|
|
|
231
|
0
|
0
|
|
|
|
|
if ( defined $self->[$TAIL] ) { |
|
|
0
|
|
|
|
|
|
232
|
0
|
|
|
|
|
|
$p->resolve( $self->[$TAIL] ); |
233
|
|
|
|
|
|
|
} |
234
|
|
|
|
|
|
|
elsif ( defined $self->[$TAIL_PROMISE] ) { |
235
|
|
|
|
|
|
|
$self->_resolve_tail_promise($engine)->done( |
236
|
|
|
|
|
|
|
sub { |
237
|
0
|
0
|
|
0
|
|
|
if ( defined $self->[$TAIL] ) { |
238
|
0
|
|
|
|
|
|
$p->resolve( $self->[$TAIL] ); |
239
|
|
|
|
|
|
|
} |
240
|
|
|
|
|
|
|
else { |
241
|
0
|
|
|
|
|
|
$p->reject('The tail operator expects a stream-like object.'); |
242
|
|
|
|
|
|
|
} |
243
|
|
|
|
|
|
|
}, |
244
|
|
|
|
|
|
|
sub { |
245
|
0
|
|
|
0
|
|
|
$p->reject(@_); |
246
|
|
|
|
|
|
|
} |
247
|
0
|
|
|
|
|
|
); |
248
|
|
|
|
|
|
|
} |
249
|
|
|
|
|
|
|
else { |
250
|
0
|
|
|
|
|
|
$p->resolve( bless [] => 'Dallycot::Value::EmptyStream' ); |
251
|
|
|
|
|
|
|
} |
252
|
|
|
|
|
|
|
|
253
|
0
|
|
|
|
|
|
return $p->promise; |
254
|
|
|
|
|
|
|
} |
255
|
|
|
|
|
|
|
|
256
|
|
|
|
|
|
|
1; |