protected MyArrayList BetaTotalRuleFirstSet(RuleElement re)
{
MyArrayList BetaFirst = new MyArrayList();
while (re != null)
{
if (re.IsTerminal())
{
BetaFirst.Add(re);
return(BetaFirst);
}
else
{
if (re.GetToken().Length > 0)
{
RuleToken rt = (RuleToken)re;
if (rt != null)
{
RuleStart conStr = GoToFirstStartRule(rt.GetConnected());
MyArrayList FirstSet = TotalRuleFirstSet(conStr);
BetaFirst = ParseHelper.UnionSet(BetaFirst, FirstSet);
if (TotalRuleEpsFree(rt.GetConnected()))
{
return(BetaFirst);
}
}
}
}
re = re.GetNext();
}
return(BetaFirst);
}
protected virtual MyArrayList GenerateFirstSet(RuleStart rs)
{
MyArrayList res = new MyArrayList();
RuleElement re = null;
if (rs != null)
{
re = rs.GetNext();
}
else
{
return(null);
}
while (re != null)
{
if (re.GetToken().Equals(""))
{
re = re.GetNext();
}
else
{
if (re.IsTerminal())
{
res.Add(re);
return(res);
}
else
{
RuleToken rt = (RuleToken)re;
RuleStart conStr = GoToFirstStartRule(rt.GetConnected());
MyArrayList res2 = null;
while (conStr != null)
{
res2 = GenerateFirstSet(conStr);
res = ParseHelper.UnionSet(res, res2);
conStr = conStr.GetAlternate();
}
if (TotalRuleEpsFree(rt.GetConnected()))
{
return(res);
}
else
{
re = re.GetNext();
}
}
}
}
return(res);
}
protected bool BetaTotalRuleEpsFree(RuleElement re)
{
while (re != null)
{
if (re.IsTerminal())
{
return(true);
}
else
{
if (re.GetToken().Length > 0)
{
RuleToken rt = (RuleToken)re;
if (TotalRuleEpsFree(rt.GetConnected()))
{
return(true);
}
}
else
{
return(false);
}
}
re = re.GetNext();
}
return(false);
}
protected virtual bool RuleIsEpsilonFree(RuleStart rs)
{
RuleElement re = null;
if (rs != null)
{
re = rs.GetNext();
}
else
{
return(false);
}
while (re != null)
{
if (re.IsTerminal())
{
rs.GetRuleConnect().EpsilonFree = true;
return(true);
}
else
{
if (re.GetToken().Equals(""))
{
rs.GetRuleConnect().EpsilonFree = false;
return(false);
}
else
{
RuleToken rt = (RuleToken)re;
bool res = RuleIsEpsilonFree(rt.GetConnected());
if (res)
{
rs.GetRuleConnect().EpsilonFree = res;
return(res);
}
else
{
re = re.GetNext();
}
}
}
}
rs.GetRuleConnect().EpsilonFree = false;
return(false);
}