public override void AddMapping(TermVariable from, Term to)
{
if (to is TermObject == false)
throw new Exception("TermObjectSubstitution is optimised for TermObjects");
int delta = from.GetHashCode() ^ to.GetHashCode();
_hashcode += delta;
Substitutions[from] = to.Clone();
}
public override Term GetMapping(TermVariable var)
{
Term result;
Substitutions.TryGetValue(var, out result);
return result;
}
private TermVariable GetUnusedVariable()
{
TermVariable curVar;
do
curVar = new TermVariable(GameContainer.SymbolTable["?a" + _count++]);
while (_originalVarsFromRule.Contains(curVar));
return curVar;
}