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