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1 | package DX::Step::Normal; |
2 | |
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3 | use Types::Standard qw(ArrayRef); |
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4 | use DX::Utils qw(deparse); |
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5 | use DX::Class; |
6 | |
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7 | with 'DX::Role::Step'; |
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8 | |
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9 | has actions => (is => 'ro', isa => ArrayRef[Action], required => 1); |
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10 | |
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11 | has depends_on => (is => 'ro', isa => DependencyGroupList, required => 1); |
12 | |
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13 | has resolves => (is => 'ro', isa => Proposition); |
14 | |
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15 | has alternative_step => (is => 'ro', isa => Step); |
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16 | |
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17 | sub but_first { |
18 | my ($self, @actions) = @_; |
19 | $self->but(actions => [ @actions, @{$self->actions} ]); |
20 | } |
21 | |
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22 | sub but_with_dependencies_on { |
23 | my ($self, @deps) = @_; |
24 | $self->but(depends_on => [ @{$self->depends_on}, @deps ]); |
25 | } |
26 | |
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27 | sub apply_to { |
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28 | my ($self, $ss) = @_; |
29 | my $old_hyp = $ss->current_hypothesis; |
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30 | trace 'step.apply.old_hyp '.$self => $old_hyp; |
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31 | trace 'step.apply.actions '.$self => $self->actions; |
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32 | my $new_hyp = $self->_apply_to_hyp($old_hyp); |
33 | return (undef, $self->alternative_step) unless $new_hyp; |
34 | trace 'step.apply.new_hyp '.$self => $new_hyp; |
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35 | return ($ss->but(current_hypothesis => $new_hyp), $self->alternative_step); |
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36 | } |
37 | |
38 | sub _apply_to_hyp { |
39 | my ($self, $old_hyp) = @_; |
40 | return undef unless my $hyp = $old_hyp->with_actions(@{$self->actions}); |
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41 | return $hyp->with_resolution($self->resolves, $self->depends_on); |
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42 | } |
43 | |
44 | 1; |