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); |
e02a5c0a |
6 | use List::MoreUtils qw(uniq); |
4ce2e778 |
7 | use Safe::Isa; |
60cda014 |
8 | use Moo; |
9 | |
10 | has next_op => (is => 'ro', required => 1); |
11 | |
12 | has return_stack => (is => 'ro', required => 1); |
13 | |
14 | has by_id => (is => 'ro', required => 1); |
15 | |
16 | has scope => (is => 'ro', required => 1); |
17 | |
18 | has last_choice => (is => 'ro', required => 1); |
19 | |
b373788e |
20 | has id_gen => (is => 'ro', default => sub { {} }); |
21 | |
b40e416a |
22 | has rule_set => (is => 'ro'); |
23 | |
24 | has facts => (is => 'ro'); |
25 | |
deec7cc4 |
26 | has dependencies => (is => 'ro', default => sub { {} }); |
27 | |
577a2146 |
28 | has actions => (is => 'ro', default => sub { {} }); |
29 | |
60cda014 |
30 | sub scope_var { |
31 | my ($self, $name) = @_; |
e09f23e1 |
32 | my $id = $self->scope->{$name} |
33 | or die "no such variable in scope: $name"; |
34 | $self->by_id->{$id}; |
60cda014 |
35 | } |
36 | |
0676b282 |
37 | sub resolve_value { |
38 | my ($self, $var) = @_; |
e02a5c0a |
39 | die("FUCK") unless $var; |
40 | die "Can't resolve unbound ${\$var->id}" unless $var->is_bound; |
4ce2e778 |
41 | my $val = $var->bound_value; |
42 | if ($val->$_does('DX::Role::Ref')) { |
43 | return $val->resolve($self); |
44 | } |
45 | return $val; |
0676b282 |
46 | } |
47 | |
b373788e |
48 | sub allocate_var { |
606537d1 |
49 | my ($self, $name, $var, $id_gen) = @_; |
50 | my $id = join('_', $name, ++($id_gen->{$name}||='000')); |
b373788e |
51 | DX::Var->new(id => $id, %$var); |
52 | } |
53 | |
606537d1 |
54 | sub expand_vars { |
b373788e |
55 | my ($self, %vars) = @_; |
56 | my %by_id = %{$self->by_id}; |
606537d1 |
57 | my %id_gen = %{$self->id_gen}; |
b373788e |
58 | foreach my $name (keys %vars) { |
b373788e |
59 | unless (blessed($vars{$name})) { |
606537d1 |
60 | my $var = $vars{$name} = $self->allocate_var( |
61 | $name, $vars{$name}, \%id_gen |
62 | ); |
b373788e |
63 | $by_id{$var->id} = $var; |
64 | } |
65 | } |
606537d1 |
66 | $self->but( |
67 | by_id => \%by_id, id_gen => \%id_gen, |
68 | ), %vars; |
69 | } |
70 | |
577a2146 |
71 | sub record_action { |
72 | my ($self, $action) = @_; |
73 | my %id_gen = %{$self->id_gen}; |
74 | my ($type) = (ref($action) =~ /([^:]+)$/); |
75 | my $id = join('_', $type, ++($id_gen{$type}||='000')); |
76 | my $recorded = $action->but(id => $id); |
77 | $self->but( |
78 | id_gen => \%id_gen, |
79 | actions => { %{$self->actions}, $id => $recorded } |
80 | ), $id; |
81 | } |
82 | |
606537d1 |
83 | sub assign_vars { |
84 | my ($self, %vars) = @_; |
85 | my ($state, %expanded) = $self->expand_vars(%vars); |
b40e416a |
86 | $state->but( |
606537d1 |
87 | scope => { %{$self->scope}, map +($_ => $expanded{$_}->id), keys %expanded } |
b373788e |
88 | ); |
89 | } |
90 | |
0de441cd |
91 | sub bind_value { |
859049a3 |
92 | my ($self, $var_id, $value) = @_; |
93 | my $bound = $self->by_id->{$var_id}->with_value($value); |
b40d5c51 |
94 | $self->but( |
859049a3 |
95 | by_id => { %{$self->by_id}, $var_id => $bound }, |
b40d5c51 |
96 | ); |
97 | } |
98 | |
7a0670cd |
99 | sub bind_stream { |
100 | my ($self, $var, $stream) = @_; |
60cda014 |
101 | my $bound = $var->with_stream($stream); |
03079510 |
102 | $self->but( |
60cda014 |
103 | by_id => { %{$self->by_id}, $var->id => $bound }, |
60cda014 |
104 | )->mark_choice($bound); |
105 | } |
106 | |
7a0670cd |
107 | sub bind_root_set { |
108 | my ($self, $var_id, $set) = @_; |
1b6999da |
109 | my $bound = $self->by_id->{$var_id}->with_root_set($set); |
d95799c4 |
110 | $self->but( |
1b6999da |
111 | by_id => { %{$self->by_id}, $var_id => $bound }, |
d95799c4 |
112 | )->mark_choice($bound); |
113 | } |
114 | |
60cda014 |
115 | sub mark_choice { |
116 | my ($self, $var) = @_; |
03079510 |
117 | $self->but(last_choice => [ $self, $var ]); |
60cda014 |
118 | } |
119 | |
120 | sub backtrack { |
121 | my ($self) = @_; |
94565614 |
122 | my ($state, $var) = ($self); |
123 | while (($state, $var) = @{$state->last_choice}) { |
60cda014 |
124 | $var->bound_value; $var->clear_bound_value; |
94565614 |
125 | return $state->mark_choice($var) unless $var->bound_stream->is_exhausted; |
60cda014 |
126 | } |
b40d5c51 |
127 | $self->return_from_run(undef); |
60cda014 |
128 | } |
129 | |
130 | sub then { |
131 | my ($self, $then) = @_; |
03079510 |
132 | $self->but(next_op => $then); |
60cda014 |
133 | } |
134 | |
b40d5c51 |
135 | sub return_from_run { |
136 | my (undef, $return) = @_; |
71217e42 |
137 | (our $Run_Return)->($return); |
138 | } |
139 | |
140 | sub return_from_op { |
141 | my (undef, $return) = @_; |
142 | if (our $Op_Return) { |
143 | $Op_Return->($return); |
144 | } |
b40d5c51 |
145 | } |
146 | |
94565614 |
147 | sub run { |
148 | my ($state) = @_; |
5622b4df |
149 | with_return { |
150 | my ($return) = @_; |
71217e42 |
151 | local our $Run_Return = $return; |
54817920 |
152 | while (my $op = $state->next_op) { |
71217e42 |
153 | my $backtrack = with_return { |
154 | my ($return) = @_; |
155 | local our $Op_Return = $return; |
156 | $state = $op->run($state); |
157 | return; |
158 | }; |
159 | if ($backtrack) { $state = $state->backtrack } |
5622b4df |
160 | } |
161 | return $state; |
94565614 |
162 | } |
5622b4df |
163 | } |
164 | |
165 | sub push_backtrack { |
71217e42 |
166 | $_[0]->then(DX::Op::Backtrack->new); |
94565614 |
167 | } |
168 | |
03079510 |
169 | sub but { |
170 | my ($self, @but) = @_; |
171 | $self->new(%$self, @but); |
172 | } |
173 | |
b40d5c51 |
174 | sub pop_return_stack { |
175 | my ($self) = @_; |
176 | my @stack = @{$self->return_stack}; |
177 | my $top = pop @stack; |
734376d9 |
178 | $self->but(return_stack => \@stack, next_op => $top->[0]); |
b40d5c51 |
179 | } |
180 | |
181 | sub push_return_then { |
182 | my ($self, $return, $then) = @_; |
183 | $self->but( |
734376d9 |
184 | return_stack => [ @{$self->return_stack}, [ $return, $self ] ], |
b40d5c51 |
185 | next_op => $then |
186 | ); |
187 | } |
188 | |
deec7cc4 |
189 | sub add_dependencies { |
190 | my ($self, @pairs) = @_; |
191 | my %deps = %{$self->dependencies}; |
192 | while (my ($from, $to) = splice(@pairs, 0, 2)) { |
193 | unless ($deps{$from}{$to}) { |
194 | $deps{$from} = { %{$deps{$from}||{}}, $to => 1 }; |
195 | } |
196 | } |
197 | $self->but(dependencies => \%deps); |
198 | } |
199 | |
200 | sub action_dependencies { |
201 | my ($self, @ids) = @_; |
202 | my @found; |
203 | my $deps = $self->dependencies; |
204 | my $by_id = $self->by_id; |
205 | my %seen; |
206 | my @queue = @ids; |
207 | while (my $id = shift @queue) { |
208 | $seen{$id}++; |
9c7b21a2 |
209 | my $value = $self->resolve_value($by_id->{$id}); |
577a2146 |
210 | push @found, $value if $value->$_does('DX::Role::Fact') |
211 | and $value->has_required_action; |
deec7cc4 |
212 | push @queue, grep !$seen{$_}, keys %{$deps->{$id}}; |
213 | } |
e02a5c0a |
214 | return uniq map $_->required_action, @found; |
deec7cc4 |
215 | } |
216 | |
217 | sub copy_vars { |
218 | my ($self) = @_; |
219 | my $by_id = $self->by_id; |
220 | $self->but(by_id => { |
221 | map +($_ => $by_id->{$_}->copy), keys %$by_id |
222 | }); |
223 | } |
224 | |
60cda014 |
225 | 1; |