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;
20 use List::Util qw(reduce);
22 has rules => (is => 'ro', default => sub { {} });
25 my ($self, $name, $vars, @cases) = @_;
26 my $full_name = join('/', $name, scalar @$vars);
27 push @{$self->rules->{$full_name}}, DX::Op::Predicate->new(
28 arg_names => $vars, arg_cases => \@cases
33 my ($self, $name, $vars, @body) = @_;
34 my $full_name = join('/', $name, scalar @$vars);
35 push @{$self->rules->{$full_name}}, $self->_make_rule($vars, @body);
40 my ($self, $vars, @body) = @_;
41 my $head = $self->expand_and_link(DX::Op::Return->new, @body);
42 DX::Op::SetupScope->new(arg_names => $vars, next => $head);
46 my ($self, $last, @body) = @_;
47 return reduce { $b->but(next => $a) }
49 reverse map $self->expand($_), @body;
53 my ($self, $thing) = @_;
54 if (ref($thing) eq 'ARRAY') {
55 my ($type, @rest) = @$thing;
56 if ($self->can(my $expand_meth = "_expand_op_${type}")) {
57 return $self->$expand_meth(@rest);
59 return $self->_expand_call(@$thing);
65 my ($self, $name, @args) = @_;
66 DX::Op::CallRule->new(rule_name => $name, rule_args => \@args);
69 sub _expand_op_cut { return DX::Op::Cut->new }
71 sub _expand_op_fail { return DX::Op::Backtrack->new }
74 my ($self, @contents) = @_;
75 my $cut = DX::Op::Cut->new(next => DX::Op::Backtrack->new);
77 body => $self->expand_and_link($cut, @contents)
81 sub _expand_op_member_of {
82 my ($self, $member_var, $coll_var) = @_;
83 DX::Op::MemberOf->new(
84 member_var => $member_var,
85 coll_var => $coll_var,
89 sub _expand_op_constrain {
90 my ($self, $vars, $constraint) = @_;
91 DX::Op::ApplyConstraint->new(
93 constraint => $constraint
97 sub _expand_op_observe {
98 my ($self, $vars, $builder) = @_;
106 my ($self, $vars, $builder) = @_;
107 DX::Op::ProposeAction->new(
113 sub _expand_op_react {
114 my ($self, $vars, $builder) = @_;
115 DX::Op::ModifyAction->new(
121 sub _expand_op_materialize {
122 my ($self, $var_name) = @_;
123 DX::Op::Materialize->new(var_name => $var_name);
126 sub _expand_op_prop {
127 my ($self, @args) = @_;
128 my %new; @new{qw(of name value)} = @args;
129 DX::Op::Prop->new(%new);
132 sub _expand_op_exists {
133 my ($self, $vars, @body) = @_;
136 body => $self->expand_and_link(DX::Op::Return->new, @body)
140 sub _expand_op_has_action {
141 my ($self, @args) = @_;
142 DX::Op::HasAction->new(arg_spec => \@args);