Commit | Line | Data |
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1 | package DX::Step::ResolveProposition; |
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2 | |
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3 | use DX::Step::EnterRecheck; |
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4 | use DX::Step::Backtrack; |
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5 | |
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6 | use Types::Standard qw(ArrayRef); |
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7 | use DX::Utils qw(deparse step); |
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8 | |
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9 | use DX::Class; |
10 | |
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11 | with 'DX::Role::Step'; |
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12 | |
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13 | has resolves => (is => 'ro', isa => Proposition); |
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14 | |
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15 | has resolution_space => (is => 'ro', isa => ResolutionSpace); |
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16 | |
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17 | has current_resolution => (is => 'lazy', init_arg => undef, builder => sub { |
18 | my ($self) = @_; |
19 | $self->resolution_space->next_resolution; |
20 | }); |
21 | |
22 | has actions => (is => 'lazy', init_arg => undef, builder => sub { |
23 | my ($self) = @_; |
24 | $self->current_resolution->actions; |
25 | }); |
26 | |
27 | has depends_on => (is => 'lazy', init_arg => undef, builder => sub { |
28 | my ($self) = @_; |
29 | my $_expand_dep = sub { |
30 | my ($type, @path) = @{$_[0]}; |
31 | my @expanded = map { |
32 | ref() ? @{$_->value_path or return ()} : $_ |
33 | } @path; |
34 | return [ $type, @expanded ]; |
35 | }; |
36 | [ map $_expand_dep->($_), |
37 | @{$self->current_resolution->veracity_depends_on} ]; |
38 | }); |
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39 | |
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40 | has alternative_step => (is => 'lazy', init_arg => undef, builder => sub { |
41 | my ($self) = @_; |
42 | my $rspace = $self->resolution_space->remaining_resolution_space; |
43 | return undef unless @{$rspace->members}; |
44 | return step( |
45 | resolves => $self->resolves, |
46 | resolution_space => $rspace |
47 | ); |
48 | }); |
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49 | |
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50 | sub but_first { |
51 | my ($self, @actions) = @_; |
52 | $self->but(actions => [ @actions, @{$self->actions} ]); |
53 | } |
54 | |
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55 | sub but_with_dependencies_on { |
56 | my ($self, @deps) = @_; |
57 | $self->but(depends_on => [ @{$self->depends_on}, @deps ]); |
58 | } |
59 | |
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60 | sub apply_to { |
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61 | my ($self, $old_ss) = @_; |
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62 | my $ns = do { |
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63 | if (my $prop = $old_ss->next_proposition) { |
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64 | DX::Step::ConsiderProposition->new( |
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65 | proposition => $prop |
66 | ) |
67 | } else { |
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68 | $old_ss->on_solution_step |
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69 | } |
70 | }; |
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71 | my $ss = $old_ss->but( |
72 | next_step => $ns, |
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73 | (@{$self->actions} |
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74 | ? (adjustments_made => [ |
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75 | [ $self, $old_ss ], |
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76 | @{$old_ss->adjustments_made} |
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77 | ]) |
78 | : () |
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79 | ), |
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80 | ); |
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81 | my $new_ss = $self->_apply_to_ss($ss); |
82 | return $ss->but(next_step => DX::Step::Backtrack->new) unless $new_ss; |
83 | return $new_ss; |
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84 | } |
85 | |
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86 | sub _apply_to_ss { |
87 | my ($self, $old_ss) = @_; |
88 | my $old_hyp = $old_ss->current_hypothesis; |
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89 | (my $hyp, my @recheck) = $old_hyp->with_resolution( |
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90 | $self->resolves, $self->depends_on, $self->actions |
91 | ); |
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92 | return undef unless $hyp; |
93 | return $self->_recheck_for( |
94 | $old_ss->but(current_hypothesis => $hyp), |
95 | @recheck |
96 | ); |
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97 | } |
98 | |
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99 | sub _recheck_for { |
100 | my ($self, $old_ss, @recheck) = @_; |
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101 | |
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102 | return $old_ss unless @recheck; |
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103 | |
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104 | my $ss = $old_ss->but( |
105 | next_step => DX::Step::EnterRecheck->new( |
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106 | proposition_list => \@recheck, |
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107 | on_completion_step => $old_ss->next_step, |
108 | on_failure_step => DX::Step::Backtrack->new, |
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109 | ), |
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110 | ); |
111 | |
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112 | return $ss; |
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113 | } |
114 | |
115 | 1; |