4 use DX::Op::SetupScope;
7 use DX::Op::ApplyConstraint;
10 use DX::Op::Backtrack;
13 use DX::Op::ProposeAction;
14 use DX::Op::ModifyAction;
15 use DX::Op::Materialize;
18 use DX::Op::Predicate;
19 use DX::Op::HasAction;
22 use List::Util qw(reduce);
24 has rules => (is => 'ro', default => sub { {} });
27 my ($self, $name, $vars, @cases) = @_;
28 my $full_name = join('/', $name, scalar @$vars);
29 push @{$self->rules->{$full_name}}, DX::Op::Predicate->new(
30 arg_names => $vars, arg_cases => \@cases
35 my ($self, $name, $vars, @body) = @_;
36 my $full_name = join('/', $name, scalar @$vars);
37 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
42 my ($self, $vars, @body) = @_;
43 my $head = $self->expand_and_link(DX::Op::Return->new, @body);
44 DX::Op::SetupScope->new(arg_names => $vars, next => $head);
48 my ($self, $last, @body) = @_;
49 return reduce { $b->but(next => $a) }
51 reverse map $self->expand($_), @body;
55 my ($self, $thing) = @_;
56 if (ref($thing) eq 'ARRAY') {
57 my ($type, @rest) = @$thing;
58 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
59 return $self->$expand_meth(@rest);
61 return $self->_expand_call(@$thing);
67 my ($self, $name, @args) = @_;
68 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
71 sub _expand_op_cut { return DX::Op::Cut->new }
73 sub _expand_op_fail { return DX::Op::Backtrack->new }
76 my ($self, @contents) = @_;
77 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
79 body => $self->expand_and_link($cut, @contents)
83 sub _expand_op_findall {
84 my ($self, $coll_name, $var_name, @contents) = @_;
86 coll_name => $coll_name,
87 var_name => $var_name,
88 body => $self->expand_and_link(DX::Op::Return->new, @contents),
92 sub _expand_op_foreach {
93 my ($self, $var_name, $body, $each_body) = @_;
95 var_name => $var_name,
96 body => $self->expand_and_link(DX::Op::Return->new, @$body),
97 each_body => $self->expand_and_link(DX::Op::Return->new, @$each_body),
101 sub _expand_op_member_of {
102 my ($self, $member_var, $coll_var) = @_;
103 DX::Op::MemberOf->new(
104 member_var => $member_var,
105 coll_var => $coll_var,
109 sub _expand_op_constrain {
110 my ($self, $vars, $constraint) = @_;
111 DX::Op::ApplyConstraint->new(
113 constraint => $constraint
117 sub _expand_op_observe {
118 my ($self, $vars, $builder) = @_;
119 DX::Op::Observe->new(
126 my ($self, $vars, $builder) = @_;
127 DX::Op::ProposeAction->new(
133 sub _expand_op_react {
134 my ($self, $vars, $builder) = @_;
135 DX::Op::ModifyAction->new(
141 sub _expand_op_materialize {
143 DX::Op::Materialize->new;
146 sub _expand_op_prop {
147 my ($self, @args) = @_;
148 my %new; @new{qw(of name value)} = @args;
149 DX::Op::Prop->new(%new);
152 sub _expand_op_exists {
153 my ($self, $vars, @body) = @_;
156 body => $self->expand_and_link(DX::Op::Return->new, @body)
160 sub _expand_op_has_action {
161 my ($self, @args) = @_;
162 DX::Op::HasAction->new(arg_spec => \@args);