lib/DX/Step/ResolveProposition.pm

   1 package DX::Step::ResolveProposition;
   2
   3 use DX::Step::EnterRecheck;
   4 use DX::Step::CompleteResolution;
   5 use DX::Step::Backtrack;
   6
   7 use DX::Utils qw(expand_deps);
   8
   9 use DX::Class;
  10
  11 with 'DX::Role::Step';
  12
  13 has resolution_space => (is => 'ro', isa => ResolutionSpace);
  14
  15 sub but_first {
  16   my ($self, @actions) = @_;
  17   $self->but(actions => [ @actions, @{$self->actions} ]);
  18 }
  19
  20 sub but_with_dependencies_on {
  21   my ($self, @deps) = @_;
  22   $self->but(depends_on => [ @{$self->depends_on}, @deps ]);
  23 }
  24
  25 sub apply_to {
  26   my ($self, $old_ss) = @_;
  27   my $rspace = $self->resolution_space;
  28   my $prop = $rspace->proposition;
  29   my $res = $rspace->next_resolution;
  30   my $vdeps = $res->veracity_depends_on;
  31   trace resolve => [ statement => [
  32     [ symbol => 'resolve' ],
  33     [ block => [
  34       [ statement => [
  35         [ symbol => 'proposition' ],
  36         @{$prop->for_deparse->[1]},
  37       ] ],
  38       (@{$res->actions}
  39         ? [ statement => [
  40             [ symbol => 'actions' ],
  41             [ block => $res->actions ],
  42           ] ]
  43         : ()),
  44       [ statement => [
  45         [ symbol => 'depends_on' ],
  46         [ block => [
  47           map [ statement => [
  48             [ symbol => (split '::', ${$_->[0]})[-1] ],
  49             [ value_path => [ @{$_}[1..$#$_] ] ]
  50           ] ], @{$vdeps}
  51         ] ],
  52       ] ],
  53     ] ]
  54   ] ];
  55   my $ss = $old_ss->but(
  56     next_step => DX::Step::CompleteResolution->new(
  57       original_search_state => $old_ss,
  58       resolution_space => $rspace,
  59     )
  60   );
  61   my $old_hyp = $old_ss->current_hypothesis;
  62   (my $hyp, my @recheck) = $old_hyp->with_resolution(
  63     $prop, $vdeps, $res->actions
  64   );
  65   return $ss->but(next_step => DX::Step::Backtrack->new) unless $hyp;
  66   return $ss->but(current_hypothesis => $hyp) unless @recheck;
  67   return $ss->but(
  68     current_hypothesis => $hyp,
  69     next_step => DX::Step::EnterRecheck->new(
  70       proposition_list => \@recheck,
  71       on_completion_step => $ss->next_step,
  72       on_failure_step => $rspace->remaining_resolution_space->next_step,
  73     ),
  74   );
  75 }
  76
  77 1;