public override bool Unify(BaseTerm t, VarStack varStack)
{
if ((t = t.ChainEnd()) is Variable) // t not unified
{
((Variable)t).Bind(this);
varStack.Push(t);
return(true);
}
if (t is ListPatternTerm && arity == t.Arity) // two ListPatternTerms match if their rangeTerms match
{
for (int i = 0; i < arity; i++)
{
if (!args[i].Unify(t.Args[i], varStack))
{
return(false);
}
}
return(true);
}
if (t is ListTerm)
{
pattern = args; // pattern is searched ...
target = ((ListTerm)t).ToList(); // ... in target
int ip = 0;
int it = 0;
return(UnifyTailEx(ip, it, varStack));
}
return(false);
}
public override bool Unify(BaseTerm t, VarStack varStack)
{
NextUnifyCount();
if (!((t = t.ChainEnd()) is ListPatternElem))
{
return(false); // should never occur
}
#if old
if (isNegSearch != ((ListPatternElem)t).isNegSearch)
{
return(false);
}
#endif
for (int i = 0; i < arity; i++)
{
if (!((args[i] == null && t.Args[i] == null) ||
args[i].Unify(t.Args[i], varStack)))
{
return(false);
}
}
return(true);
}
public AltListTerm(string leftBracket, string rightBracket, BaseTerm t0, BaseTerm t1)
: base(t0.ChainEnd(), t1.ChainEnd())
{
isAltList = true;
functor = leftBracket + ".." + rightBracket;
this.leftBracket = leftBracket;
this.rightBracket = rightBracket;
}
public override bool Unify (BaseTerm t, VarStack varStack)
{
if ((t = t.ChainEnd ()) is Variable) // t not unified
{
((Variable)t).Bind (this);
varStack.Push (t);
return true;
}
if (t is ListPatternTerm && arity == t.Arity) // two ListPatternTerms match if their rangeTerms match
{
for (int i = 0; i < arity; i++)
if (!args [i].Unify (t.Args [i], varStack)) return false;
return true;
}
if (t is ListTerm)
{
pattern = args; // pattern is searched ...
target = ((ListTerm)t).ToList (); // ... in target
int ip = 0;
int it = 0;
return UnifyTailEx (ip, it, varStack);
}
return false;
}
public override bool Unify (BaseTerm t, VarStack varStack)
{
NextUnifyCount ();
if (!((t = t.ChainEnd ()) is ListPatternElem)) return false; // should never occur
#if old
if (isNegSearch != ((ListPatternElem)t).isNegSearch) return false;
#endif
for (int i = 0; i < arity; i++)
if (!((args [i] == null && t.Args [i] == null) ||
args [i].Unify (t.Args [i], varStack))) return false;
return true;
}