public override TokenSet Init_PreCheckSet(ParseNode_Root parser)
{
if (FirstSet == null)
{
FirstSet = new TokenSet();
foreach (var t in nodes)
{
if (t is ParseNode_ManyOpt_If)
{
continue;
}
var set = t.Init_PreCheckSet(parser);
if (FirstSet.Accepts(set))
{
Debug.LogError(this + ": ambiguous alternatives");
Debug.LogWarning(FirstSet.Intersecton(set).ToString(parser));
}
FirstSet.Add(set);
}
foreach (var t in nodes)
{
if (t is ParseNode_ManyOpt_If)
{
var set = t.Init_PreCheckSet(parser);
FirstSet.Add(set);
}
}
}
return(FirstSet);
}
public virtual void CheckLL1(ParseNode_Root parser)
{
if (FollowSet == null)
{
throw new Exception(this + ": follow not set");
}
if (FirstSet.ContainsEmpty() && FirstSet.Accepts(FollowSet))
{
throw new Exception(this + ": ambiguous\n"
+ " lookahead " + FirstSet.ToString(parser) + "\n"
+ " follow " + FollowSet.ToString(parser));
}
}
