//TODO: Create a version with just a set of components that we can share with post-optimizations
private static void OptimizeAwayFalse(IDictionary<Fact, IComponent> components, Dictionary<Fact, IComponent> negations,
PropNet pn, IComponent trueComponent, IComponent falseComponent)
{
Debug.Assert((components != null && negations != null) || pn != null);
Debug.Assert((components == null && negations == null) || pn == null);
foreach (IComponent output in falseComponent.Outputs.ToList())
{
if (IsEssentialProposition(output) || output is ITransition)
{
//Since this is the false constant, there are a few "essential" types we don't actually want to keep around.
if (!IsLegalOrGoalProposition(output))
continue;
}
var prop = output as IProposition;
if (prop != null)
{
//Move its outputs to be outputs of false
foreach (IComponent child in prop.Outputs)
{
//Disconnect
child.RemoveInput(prop);
//output.removeOutput(child); //do at end
//Reconnect; will get children before returning, if nonessential
falseComponent.AddOutput(child);
child.AddInput(falseComponent);
}
prop.RemoveAllOutputs();
if (!IsEssentialProposition(prop))
{
//Remove the proposition entirely
falseComponent.RemoveOutput(prop);
output.RemoveInput(falseComponent);
//Update its location to the trueComponent in our map
if (components != null)
{
components[prop.Name] = falseComponent;
negations[prop.Name] = trueComponent;
}
else
pn.RemoveComponent(prop);
}
}
else
{
var and = output as IAnd;
if (and != null)
{
//Attach children of and to falseComponent
foreach (IComponent child in and.Outputs)
{
child.AddInput(falseComponent);
falseComponent.AddOutput(child);
child.RemoveInput(and);
}
//Disconnect and completely
and.RemoveAllOutputs();
foreach (IComponent parent in and.Inputs)
parent.RemoveOutput(and);
and.RemoveAllInputs();
if (pn != null)
pn.RemoveComponent(and);
}
else
{
var or = output as IOr;
if (or != null)
{
//Remove as input from or
or.RemoveInput(falseComponent);
falseComponent.RemoveOutput(or);
//If or has only one input, remove it
if (or.Inputs.Count == 1)
{
IComponent input = or.GetSingleInput();
or.RemoveInput(input);
input.RemoveOutput(or);
foreach (IComponent output1 in or.Outputs)
{
//Disconnect from and
output1.RemoveInput(or);
//or.removeOutput(out); //do at end
//Connect directly to the new input
output1.AddInput(input);
input.AddOutput(output1);
}
or.RemoveAllOutputs();
if (pn != null)
{
pn.RemoveComponent(or);
}
}
else if (!or.Inputs.Any())
{
if (pn != null)
{
pn.RemoveComponent(or);
}
}
}
else
{
var not = output as INot;
if (not != null)
{
//Disconnect from falseComponent
not.RemoveInput(falseComponent);
falseComponent.RemoveOutput(not);
//Connect all children of the not to trueComponent
foreach (IComponent child in not.Outputs)
{
//Disconnect
child.RemoveInput(not);
//not.removeOutput(child); //Do at end
//Connect to trueComponent
child.AddInput(trueComponent);
trueComponent.AddOutput(child);
}
not.RemoveAllOutputs();
if (pn != null)
pn.RemoveComponent(not);
}
else if (output is ITransition)
{
//???
throw new Exception("Fix optimizeAwayFalse's case for Transitions");
}
}
}
}
}
}
private static void OptimizeAwayTrue(IDictionary<Fact, IComponent> components, IDictionary<Fact, IComponent> negations,
PropNet pn, IComponent trueComponent, IComponent falseComponent)
{
Debug.Assert((components != null && negations != null) || pn != null);
foreach (IComponent output in trueComponent.Outputs.ToList())
{
if (IsEssentialProposition(output) || output is ITransition)
continue;
var prop = output as IProposition;
if (prop != null)
{
//Move its outputs to be outputs of true
foreach (IComponent child in prop.Outputs)
{
//Disconnect
child.RemoveInput(prop);
//output.removeOutput(child); //do at end
//Reconnect; will get children before returning, if nonessential
trueComponent.AddOutput(child);
child.AddInput(trueComponent);
}
prop.RemoveAllOutputs();
if (!IsEssentialProposition(prop))
{
//Remove the proposition entirely
trueComponent.RemoveOutput(prop);
output.RemoveInput(trueComponent);
//Update its location to the trueComponent in our map
if (components != null)
{
components[prop.Name] = trueComponent;
Debug.Assert(negations != null, "negations != null");
negations[prop.Name] = falseComponent;
}
else
pn.RemoveComponent(prop);
}
}
else
{
var or = output as IOr;
if (or != null)
{
//Attach children of or to trueComponent
foreach (IComponent child in or.Outputs)
{
child.AddInput(trueComponent);
trueComponent.AddOutput(child);
child.RemoveInput(or);
}
//Disconnect or completely
or.RemoveAllOutputs();
foreach (IComponent parent in or.Inputs)
parent.RemoveOutput(or);
or.RemoveAllInputs();
if (pn != null)
pn.RemoveComponent(or);
}
else
{
var and = output as IAnd;
if (and != null)
{
//Remove as input from and
and.RemoveInput(trueComponent);
trueComponent.RemoveOutput(and);
//If and has only one input, remove it
if (and.Inputs.Count == 1)
{
IComponent input = and.GetSingleInput();
and.RemoveInput(input);
input.RemoveOutput(and);
foreach (IComponent output1 in and.Outputs)
{
//Disconnect from and
output1.RemoveInput(and);
//and.removeOutput(out); //do at end
//Connect directly to the new input
output1.AddInput(input);
input.AddOutput(output1);
}
and.RemoveAllOutputs();
if (pn != null)
pn.RemoveComponent(and);
}
else if (and.Inputs.Any())
if (pn != null)
pn.RemoveComponent(and);
}
else
{
var not = output as INot;
if (not != null)
{
//Disconnect from trueComponent
not.RemoveInput(trueComponent);
trueComponent.RemoveOutput(not);
//Connect all children of the not to falseComponent
foreach (IComponent child in not.Outputs)
{
//Disconnect
child.RemoveInput(not);
//not.removeOutput(child); //Do at end
//Connect to falseComponent
child.AddInput(falseComponent);
falseComponent.AddOutput(child);
}
not.RemoveAllOutputs();
if (pn != null)
pn.RemoveComponent(not);
}
}
}
}
}
}
/// <summary>
/// Adds inputs and outputs to <tt>source</tt> and <tt>target</tt> such
/// that <tt>source</tt> becomes an input to <tt>target</tt>.
/// </summary>
/// <param name="source">A component.</param>
/// <param name="target">A second component.</param>
private static void Link(IComponent source, IComponent target)
{
source.AddOutput(target);
target.AddInput(source);
}