public bool GetNext(out BuildingProduction next)
{
if (Next != null)
{
next = Next;
return(true);
}
else if (Index < Elems.Length)
{
next = Next = new BuildingProduction(Prod, Index + 1, LookAheads);
return(true);
}
next = null;
return(false);
}
// 匹配产生式的左部、右部、索引、展望符，且另一个的展望符集要包含于自身的展望符集
public bool IsCompatible(BuildingProduction another)
{
return(Comparation.EqualsWithOrder(Elems, another.Elems) &&
another.Index == Index &&
Comparation.IncludesAll(LookAheads, another.LookAheads));
}
// 仅仅匹配产生式右部和项目索引
public bool IsConcentric(BuildingProduction another)
{
return(Comparation.EqualsWithOrder(Elems, another.Elems) && another.Index == Index);
}
// 匹配产生式左部、右部、索引、展望符
public bool Equals(BuildingProduction another)
{
return(another.Prod == Prod &&
another.Index == Index &&
Comparation.EqualsWithoutOrder(another.LookAheads, LookAheads));
}
// 匹配产生式左部、右部、索引
public bool CanPile(BuildingProduction another)
{
return(another.Prod == Prod &&
another.Index == Index);
}