rspace tracing

[scpubgit/DX.git] / lib / DX / Step / ResolveProposition.pm

diff --git a/lib/DX/Step/ResolveProposition.pm b/lib/DX/Step/ResolveProposition.pm
index c543d21..3969867 100644 (file)
--- a/lib/DX/Step/ResolveProposition.pm
+++ b/lib/DX/Step/ResolveProposition.pm
@@ -1,18 +1,43 @@
 package DX::Step::ResolveProposition;
 
+use DX::Step::EnterRecheck;
+use DX::Step::Backtrack;
+
 use Types::Standard qw(ArrayRef);
-use DX::Utils qw(deparse);
+use DX::Utils qw(expand_deps);
+
 use DX::Class;
 
 with 'DX::Role::Step';
 
-has actions => (is => 'ro', isa => ArrayRef[Action], required => 1);
+has resolves => (is => 'lazy', init_arg => undef, builder => sub {
+  my ($self) = @_;
+  $self->resolution_space->proposition;
+});
+
+has resolution_space => (is => 'ro', isa => ResolutionSpace);
+
+has current_resolution => (is => 'lazy', init_arg => undef, builder => sub {
+  my ($self) = @_;
+  $self->resolution_space->next_resolution;
+});
 
-has depends_on => (is => 'ro', isa => DependencyGroupList, required => 1);
+has actions => (is => 'lazy', init_arg => undef, builder => sub {
+  my ($self) = @_;
+  $self->current_resolution->actions;
+});
 
-has resolves => (is => 'ro', isa => Proposition);
+has depends_on => (is => 'lazy', init_arg => undef, builder => sub {
+  my ($self) = @_;
+  expand_deps($self->current_resolution->veracity_depends_on);
+});
 
-has alternative_step => (is => 'ro', isa => Step);
+has alternative_step => (is => 'lazy', init_arg => undef, builder => sub {
+  my ($self) = @_;
+  my $rspace = $self->resolution_space->remaining_resolution_space;
+  return undef unless @{$rspace->members};
+  return $rspace->next_step;
+});
 
 sub but_first {
   my ($self, @actions) = @_;
@@ -25,40 +50,79 @@ sub but_with_dependencies_on {
 }
 
 sub apply_to {
-  my ($self, $ss) = @_;
-  my $old_hyp = $ss->current_hypothesis;
-  trace 'step.apply.old_hyp '.$self => $old_hyp;
-  trace 'step.apply.actions '.$self => $self->actions;
-  my $new_hyp = $self->_apply_to_hyp($old_hyp);
-  return $ss->but(next_step => DX::Step::Backtrack->new) unless $new_hyp;
-  trace 'step.apply.new_hyp '.$self => $new_hyp;
+  my ($self, $old_ss) = @_;
+  trace resolve => [ statement => [
+    [ symbol => 'resolve' ],
+    [ block => [
+      [ statement => [
+        [ symbol => 'proposition' ],
+        @{$self->resolves->for_deparse->[1]},
+      ] ],
+      (@{$self->actions}
+        ? [ statement => [
+            [ symbol => 'actions' ],
+            [ block => $self->actions ],
+          ] ]
+        : ()),
+      [ statement => [
+        [ symbol => 'depends_on' ],
+        [ pairs => [
+          map [
+            (split '::', ${$_->[0]})[-1],
+            [ value_path => [ @{$_}[1..$#$_] ] ]
+          ], @{$self->depends_on}
+        ] ],
+      ] ],
+    ] ]
+  ] ];
   my $ns = do {
-    if (my $prop = $ss->next_proposition($new_hyp)) {
+    if (my $prop = $old_ss->next_proposition) {
       DX::Step::ConsiderProposition->new(
         proposition => $prop
       )
     } else {
-      $ss->on_solution_step
+      $old_ss->on_solution_step
     }
   };
-  my $alt_step = $self->alternative_step;
-  return (
-    $ss->but(
-      current_hypothesis => $new_hyp,
-      next_step => $ns,
-      ($alt_step
-        ? (alternatives => [ [ $old_hyp, $alt_step ], @{$ss->alternatives} ])
-        : ()
-      ),
-    ),
+  my $ss = $old_ss->but(
+    next_step => $ns,
+    decisions_taken => [
+      [ $self->resolution_space, $old_ss ],
+      @{$old_ss->decisions_taken}
+    ],
   );
+  my $new_ss = $self->_apply_to_ss($ss);
+  return $ss->but(next_step => DX::Step::Backtrack->new) unless $new_ss;
+  return $new_ss;
 }
 
-sub _apply_to_hyp {
-  my ($self, $old_hyp) = @_;
-  return $old_hyp->with_resolution(
+sub _apply_to_ss {
+  my ($self, $old_ss) = @_;
+  my $old_hyp = $old_ss->current_hypothesis;
+  (my $hyp, my @recheck) = $old_hyp->with_resolution(
     $self->resolves, $self->depends_on, $self->actions
   );
+  return undef unless $hyp;
+  return $self->_recheck_for(
+    $old_ss->but(current_hypothesis => $hyp),
+    @recheck
+  );
+}
+
+sub _recheck_for {
+  my ($self, $old_ss, @recheck) = @_;
+
+  return $old_ss unless @recheck;
+
+  my $ss = $old_ss->but(
+    next_step => DX::Step::EnterRecheck->new(
+      proposition_list => \@recheck,
+      on_completion_step => $old_ss->next_step,
+      on_failure_step => DX::Step::Backtrack->new,
+    ),
+  );
+
+  return $ss;
 }
 
 1;