/// <summary>
/// Compiles a literal for unification using a query unifier
/// </summary>
/// <returns>
/// The list of variables in the literal
/// </returns>
public static IEnumerable <ILiteral> Compile(this IQueryUnifier unifier, ILiteral literal, IBindings bindings = null)
{
if (unifier == null)
{
throw new ArgumentNullException("unifier");
}
if (literal == null)
{
throw new ArgumentNullException("literal");
}
// Flatten the literal
var assignments = literal.Flatten().ToList();
// Bind the variables in order
var freeVariables = unifier.Bind(assignments);
// Rebind the assignments if necessary
if (bindings != null)
{
assignments = assignments.BindVariables(bindings).ToList();
}
// Compile the result
if (!unifier.Compile(assignments))
{
return(null);
}
return(freeVariables);
}
/// <summary>
/// Compiles a literal for unification using a query unifier
/// </summary>
/// <returns>
/// The list of variables in the literal
/// </returns>
public static IEnumerable<ILiteral> Compile(this IQueryUnifier unifier, ILiteral literal, IBindings bindings = null)
{
if (unifier == null) throw new ArgumentNullException("unifier");
if (literal == null) throw new ArgumentNullException("literal");
// Flatten the literal
var assignments = literal.Flatten().ToList();
// Bind the variables in order
var freeVariables = unifier.Bind(assignments);
// Rebind the assignments if necessary
if (bindings != null)
{
assignments = assignments.BindVariables(bindings).ToList();
}
// Compile the result
if (!unifier.Compile(assignments))
{
return null;
}
return freeVariables;
}
/// <summary>
/// Adds a new argument to this object
/// </summary>
public void AddArgument(ILiteral argument)
{
// Get the assignments for this argument
var assignments = argument.Flatten().ToArray();
// The first assignment defines the argument value, and the rest are just other variables
var rootAssignment = assignments[0];
var variableAssignments = assignments.Skip(1);
// If the root assignment is a variable, use a variable argument assignment instead
if (rootAssignment.Value.UnificationKey == null)
{
var variableRoot = rootAssignment;
variableAssignments = variableAssignments.Concat(new[] { variableRoot });
rootAssignment = new ArgumentAssignment(new Variable(), variableRoot.Variable);
}
// Store the list of other assignments
_arguments.Add(rootAssignment);
_otherAssignments.AddRange(variableAssignments);
}
/// <summary>
/// Adds a new argument to this object
/// </summary>
public void AddArgument(ILiteral argument)
{
// Get the assignments for this argument
var assignments = argument.Flatten().ToArray();
// The first assignment defines the argument value, and the rest are just other variables
var rootAssignment = assignments[0];
var variableAssignments = assignments.Skip(1);
// If the root assignment is a variable, use a variable argument assignment instead
if (rootAssignment.Value.UnificationKey == null)
{
var variableRoot = rootAssignment;
variableAssignments = variableAssignments.Concat(new[] { variableRoot });
rootAssignment = new ArgumentAssignment(new Variable(), variableRoot.Variable);
}
// Store the list of other assignments
_arguments.Add(rootAssignment);
_otherAssignments.AddRange(variableAssignments);
}
