public bool termEqual(object term)
{
term = YP.getValue(term);
if (term is Functor1)
{
Functor1 termFunctor = (Functor1)term;
return(_name.Equals(termFunctor._name) && YP.termEqual(_arg1, termFunctor._arg1));
}
return(false);
}
public bool lessThan(Functor1 functor)
{
// Do the equal check first since it is faster.
if (!_name.Equals(functor._name))
{
return(_name.lessThan(functor._name));
}
return(YP.termLessThan(_arg1, functor._arg1));
}
/// <summary>
/// If arg is another Functor1, then succeed (yield once) if this and arg have the
/// same name and the functor args unify, otherwise fail (don't yield).
/// If arg is a Variable, then call its unify to unify with this.
/// Otherwise fail (don't yield).
/// </summary>
/// <param name="arg"></param>
/// <returns></returns>
public IEnumerable <bool> unify(object arg)
{
arg = YP.getValue(arg);
if (arg is Functor1)
{
Functor1 argFunctor = (Functor1)arg;
if (_name.Equals(argFunctor._name))
{
foreach (bool l1 in YP.unify(_arg1, argFunctor._arg1))
{
yield return(false);
}
}
}
else if (arg is Variable)
{
foreach (bool l1 in ((Variable)arg).unify(this))
{
yield return(false);
}
}
}
public bool lessThan(Functor1 functor)
{
// Do the equal check first since it is faster.
if (!_name.Equals(functor._name))
return _name.lessThan(functor._name);
return YP.termLessThan(_arg1, functor._arg1);
}