public void SolveAsSelf()
{
var a = Literal.NewAtom();
var b = Literal.NewAtom();
var fab = Literal.NewFunctor(2).With(a, b);
var clause = Clause.Always(fab);
var solver = new SimpleSingleClauseSolver(clause, new NothingSolver());
Assert.IsTrue(solver.Query(fab).Success);
}
public void DifferentDoesNotSolve()
{
var a = Literal.NewAtom();
var b = Literal.NewAtom();
var c = Literal.NewAtom();
var f = Literal.NewFunctor(2);
var fab = f.With(a, b);
var fac = f.With(a, c);
var clause = Clause.Always(fab);
var solver = new SimpleSingleClauseSolver(clause, new NothingSolver());
Assert.IsFalse(solver.Query(fac).Success);
}
public void SolveWithVariable()
{
var a = Literal.NewAtom();
var b = Literal.NewAtom();
var f = Literal.NewFunctor(2);
var X = Literal.NewVariable();
var fab = f.With(a, b);
var fXb = f.With(X, b);
var clause = Clause.Always(fab);
var solver = new SimpleSingleClauseSolver(clause, new NothingSolver());
Assert.IsTrue(solver.Query(fXb).Success);
}
public void VariablesThatCantUnifyCantBeSolved2()
{
// The arguments a,b can't unify against X,X as X can't be both values
var a = Literal.NewAtom();
var b = Literal.NewAtom();
var f = Literal.NewFunctor(2);
var X = Literal.NewVariable();
var fab = f.With(a, b);
var fXX = f.With(X, X);
var clause = Clause.Always(fab);
var solver = new SimpleSingleClauseSolver(clause, new NothingSolver());
Assert.IsFalse(solver.Query(fXX).Success);
}
public void VariablesThatCantUnifyCantBeSolved1()
{
// An argument of f(X, X) can't unify against f(a, b) as X can't be both b and a
var a = Literal.NewAtom();
var b = Literal.NewAtom();
var f = Literal.NewFunctor(2);
var g = Literal.NewFunctor(1);
var X = Literal.NewVariable();
var gfab = g.With(f.With(a, b));
var gfXX = g.With(f.With(X, X));
var clause = Clause.Always(gfab);
var solver = new SimpleSingleClauseSolver(clause, new NothingSolver());
Assert.IsFalse(solver.Query(gfXX).Success);
}