Commit | Line | Data |
60cda014 |
1 | package DX::State; |
2 | |
5622b4df |
3 | use Return::MultiLevel qw(with_return); |
71217e42 |
4 | use DX::Op::Backtrack; |
b373788e |
5 | use Scalar::Util qw(blessed); |
4ce2e778 |
6 | use Safe::Isa; |
60cda014 |
7 | use Moo; |
8 | |
9 | has next_op => (is => 'ro', required => 1); |
10 | |
11 | has return_stack => (is => 'ro', required => 1); |
12 | |
13 | has by_id => (is => 'ro', required => 1); |
14 | |
15 | has scope => (is => 'ro', required => 1); |
16 | |
17 | has last_choice => (is => 'ro', required => 1); |
18 | |
b373788e |
19 | has id_gen => (is => 'ro', default => sub { {} }); |
20 | |
b40e416a |
21 | has rule_set => (is => 'ro'); |
22 | |
23 | has facts => (is => 'ro'); |
24 | |
deec7cc4 |
25 | has dependencies => (is => 'ro', default => sub { {} }); |
26 | |
60cda014 |
27 | sub scope_var { |
28 | my ($self, $name) = @_; |
29 | $self->by_id->{$self->scope->{$name}}; |
30 | } |
31 | |
0676b282 |
32 | sub resolve_value { |
33 | my ($self, $var) = @_; |
4ce2e778 |
34 | my $val = $var->bound_value; |
35 | if ($val->$_does('DX::Role::Ref')) { |
36 | return $val->resolve($self); |
37 | } |
38 | return $val; |
0676b282 |
39 | } |
40 | |
b373788e |
41 | sub allocate_var { |
606537d1 |
42 | my ($self, $name, $var, $id_gen) = @_; |
43 | my $id = join('_', $name, ++($id_gen->{$name}||='000')); |
b373788e |
44 | DX::Var->new(id => $id, %$var); |
45 | } |
46 | |
606537d1 |
47 | sub expand_vars { |
b373788e |
48 | my ($self, %vars) = @_; |
49 | my %by_id = %{$self->by_id}; |
606537d1 |
50 | my %id_gen = %{$self->id_gen}; |
b373788e |
51 | foreach my $name (keys %vars) { |
b373788e |
52 | unless (blessed($vars{$name})) { |
606537d1 |
53 | my $var = $vars{$name} = $self->allocate_var( |
54 | $name, $vars{$name}, \%id_gen |
55 | ); |
b373788e |
56 | $by_id{$var->id} = $var; |
57 | } |
58 | } |
606537d1 |
59 | $self->but( |
60 | by_id => \%by_id, id_gen => \%id_gen, |
61 | ), %vars; |
62 | } |
63 | |
64 | sub assign_vars { |
65 | my ($self, %vars) = @_; |
66 | my ($state, %expanded) = $self->expand_vars(%vars); |
b40e416a |
67 | $state->but( |
606537d1 |
68 | scope => { %{$self->scope}, map +($_ => $expanded{$_}->id), keys %expanded } |
b373788e |
69 | ); |
70 | } |
71 | |
0de441cd |
72 | sub bind_value { |
859049a3 |
73 | my ($self, $var_id, $value) = @_; |
74 | my $bound = $self->by_id->{$var_id}->with_value($value); |
b40d5c51 |
75 | $self->but( |
859049a3 |
76 | by_id => { %{$self->by_id}, $var_id => $bound }, |
b40d5c51 |
77 | ); |
78 | } |
79 | |
7a0670cd |
80 | sub bind_stream { |
81 | my ($self, $var, $stream) = @_; |
60cda014 |
82 | my $bound = $var->with_stream($stream); |
03079510 |
83 | $self->but( |
60cda014 |
84 | by_id => { %{$self->by_id}, $var->id => $bound }, |
60cda014 |
85 | )->mark_choice($bound); |
86 | } |
87 | |
7a0670cd |
88 | sub bind_root_set { |
89 | my ($self, $var_id, $set) = @_; |
1b6999da |
90 | my $bound = $self->by_id->{$var_id}->with_root_set($set); |
d95799c4 |
91 | $self->but( |
1b6999da |
92 | by_id => { %{$self->by_id}, $var_id => $bound }, |
d95799c4 |
93 | )->mark_choice($bound); |
94 | } |
95 | |
60cda014 |
96 | sub mark_choice { |
97 | my ($self, $var) = @_; |
03079510 |
98 | $self->but(last_choice => [ $self, $var ]); |
60cda014 |
99 | } |
100 | |
101 | sub backtrack { |
102 | my ($self) = @_; |
94565614 |
103 | my ($state, $var) = ($self); |
104 | while (($state, $var) = @{$state->last_choice}) { |
60cda014 |
105 | $var->bound_value; $var->clear_bound_value; |
94565614 |
106 | return $state->mark_choice($var) unless $var->bound_stream->is_exhausted; |
60cda014 |
107 | } |
b40d5c51 |
108 | $self->return_from_run(undef); |
60cda014 |
109 | } |
110 | |
111 | sub then { |
112 | my ($self, $then) = @_; |
03079510 |
113 | $self->but(next_op => $then); |
60cda014 |
114 | } |
115 | |
b40d5c51 |
116 | sub return_from_run { |
117 | my (undef, $return) = @_; |
71217e42 |
118 | (our $Run_Return)->($return); |
119 | } |
120 | |
121 | sub return_from_op { |
122 | my (undef, $return) = @_; |
123 | if (our $Op_Return) { |
124 | $Op_Return->($return); |
125 | } |
b40d5c51 |
126 | } |
127 | |
94565614 |
128 | sub run { |
129 | my ($state) = @_; |
5622b4df |
130 | with_return { |
131 | my ($return) = @_; |
71217e42 |
132 | local our $Run_Return = $return; |
54817920 |
133 | while (my $op = $state->next_op) { |
71217e42 |
134 | my $backtrack = with_return { |
135 | my ($return) = @_; |
136 | local our $Op_Return = $return; |
137 | $state = $op->run($state); |
138 | return; |
139 | }; |
140 | if ($backtrack) { $state = $state->backtrack } |
5622b4df |
141 | } |
142 | return $state; |
94565614 |
143 | } |
5622b4df |
144 | } |
145 | |
146 | sub push_backtrack { |
71217e42 |
147 | $_[0]->then(DX::Op::Backtrack->new); |
94565614 |
148 | } |
149 | |
03079510 |
150 | sub but { |
151 | my ($self, @but) = @_; |
152 | $self->new(%$self, @but); |
153 | } |
154 | |
b40d5c51 |
155 | sub pop_return_stack { |
156 | my ($self) = @_; |
157 | my @stack = @{$self->return_stack}; |
158 | my $top = pop @stack; |
734376d9 |
159 | $self->but(return_stack => \@stack, next_op => $top->[0]); |
b40d5c51 |
160 | } |
161 | |
162 | sub push_return_then { |
163 | my ($self, $return, $then) = @_; |
164 | $self->but( |
734376d9 |
165 | return_stack => [ @{$self->return_stack}, [ $return, $self ] ], |
b40d5c51 |
166 | next_op => $then |
167 | ); |
168 | } |
169 | |
deec7cc4 |
170 | sub add_dependencies { |
171 | my ($self, @pairs) = @_; |
172 | my %deps = %{$self->dependencies}; |
173 | while (my ($from, $to) = splice(@pairs, 0, 2)) { |
174 | unless ($deps{$from}{$to}) { |
175 | $deps{$from} = { %{$deps{$from}||{}}, $to => 1 }; |
176 | } |
177 | } |
178 | $self->but(dependencies => \%deps); |
179 | } |
180 | |
181 | sub action_dependencies { |
182 | my ($self, @ids) = @_; |
183 | my @found; |
184 | my $deps = $self->dependencies; |
185 | my $by_id = $self->by_id; |
186 | my %seen; |
187 | my @queue = @ids; |
188 | while (my $id = shift @queue) { |
189 | $seen{$id}++; |
9c7b21a2 |
190 | my $value = $self->resolve_value($by_id->{$id}); |
191 | push @found, $id if $value->$_does('DX::Role::Fact') |
192 | and $value->has_required_action; |
deec7cc4 |
193 | push @queue, grep !$seen{$_}, keys %{$deps->{$id}}; |
194 | } |
195 | return @found; |
196 | } |
197 | |
198 | sub copy_vars { |
199 | my ($self) = @_; |
200 | my $by_id = $self->by_id; |
201 | $self->but(by_id => { |
202 | map +($_ => $by_id->{$_}->copy), keys %$by_id |
203 | }); |
204 | } |
205 | |
60cda014 |
206 | 1; |