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1 | package DX::Hypothesis; |
2 | |
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3 | use DX::ActionPolicy::LockScope; |
4 | use Types::Standard qw(ArrayRef); |
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5 | use DX::Utils qw(deparse); |
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6 | use DX::Class; |
7 | |
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8 | has scope => (is => 'ro', isa => Scope, required => 1); |
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9 | |
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10 | has resolved_propositions => ( |
11 | is => 'ro', isa => ResolvedPropositionSet, required => 1 |
12 | ); |
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13 | |
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14 | has outstanding_propositions => ( |
15 | is => 'ro', isa => ArrayRef[Proposition], required => 1 |
16 | ); |
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17 | |
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18 | has actions => ( |
19 | is => 'ro', isa => ArrayRef[Action], required => 1 |
20 | ); |
21 | |
22 | has action_policy => (is => 'ro', isa => ActionPolicy, required => 1); |
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23 | |
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24 | sub head_proposition { shift->outstanding_propositions->[0] } |
25 | |
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26 | sub with_actions { |
27 | my ($self, @actions) = @_; |
28 | my $hyp = $self; |
29 | foreach my $act (@actions) { |
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30 | return undef unless $self->action_policy->allows($act); |
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31 | ($hyp, my @events) = $act->dry_run($hyp); |
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32 | return undef unless $hyp; |
33 | $hyp = $hyp->but_recheck_for(@events); |
34 | return undef unless $hyp; |
35 | } |
36 | return $hyp; |
37 | } |
38 | |
39 | sub but_recheck_for { |
40 | my ($self, @events) = @_; |
41 | my ($still_resolved, @recheck) = $self->resolved_propositions |
42 | ->but_expire_for(@events); |
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43 | return $self unless @recheck; |
44 | |
45 | my $ap = DX::ActionPolicy::LockScope->new( |
46 | lock_to_depth => $self->scope->depth, |
47 | next_policy => $self->action_policy, |
48 | ); |
49 | |
50 | # we should probably be doing something about pruning the scope |
51 | # but that's completely pointless until we have rules |
52 | |
53 | my $hyp = ref($self)->new( |
54 | scope => $self->scope, |
55 | resolved_propositions => DX::ResolvedPropositionSet->new_empty, |
56 | outstanding_propositions => \@recheck, |
57 | actions => [], |
58 | action_policy => $ap, |
59 | ); |
60 | |
61 | my $ss = DX::SearchState->new_for($hyp); |
62 | |
63 | return undef unless my $sol_ss = $ss->find_solution; |
64 | |
65 | my $sol_rps = $sol_ss->current_hypothesis->resolved_propositions; |
66 | |
67 | my $rps = $still_resolved; |
68 | |
69 | $rps = $rps->with_updated_dependencies_for( |
70 | $_, $sol_rps->dependencies_for($_) |
71 | ) for @recheck; |
72 | |
73 | return $self->but(resolved_propositions => $rps); |
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74 | } |
75 | |
76 | sub resolve_head_dependent_on { |
77 | my ($self, $depends) = @_; |
78 | my ($first, @rest) = @{$self->outstanding_propositions}; |
79 | $self->but( |
80 | resolved_propositions => $self->resolved_propositions |
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81 | ->with_resolution_for( |
82 | $first, |
83 | $depends, |
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84 | ), |
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85 | outstanding_propositions => \@rest, |
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86 | ); |
87 | } |
88 | |
89 | 1; |