private RuleElement GotoLastRule(RuleElement re)
{
while (re.GetNext() != null)
{
re = re.GetNext();
}
return(re);
}
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);
}
public string GetAllElements()
{
RuleElement re = m_Next;
string Elements = "";
while (re != null)
{
if (re.GetToken().Length > 0)
{
if (re.IsTerminal())
{
Elements += "\'" + re.GetToken() + "\',";
}
else
{
Elements += re.GetToken() + ",";
}
}
else
{
Elements += " ,";
}
re = re.GetNext();
}
return(Elements);
}
public string GetRuleString(RuleElement Start, int PntPos)
{
string res = Start.GetToken() + "->";
RuleElement iterator = Start.GetNext();
int Pos = 1;
while (iterator != null)
{
if (PntPos == Pos)
{
res += ".";
}
if (iterator.IsTerminal())
{
res += "'" + iterator.GetToken() + "'";
}
else
{
res += iterator.GetToken();
}
iterator = iterator.GetNext();
if (iterator != null)
{
res += ",";
}
Pos++;
}
if (PntPos == Pos)
{
res += ".";
}
res += ";";
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 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);
}
private MyArrayList GenerateFollowList(MyArrayList NonTerms)
{
MyArrayList Follows = new MyArrayList();
for (int i = 0; i < NonTerms.Count; i++)
{
RuleElement re = (RuleElement)NonTerms[i];
RuleStart rs = re.GetBegin();
BNFRule rl = rs.GetRuleConnect();
RuleElement nextRe = re.GetNext();
if (nextRe == null)
{
Follows = ParseHelper.UnionSet(Follows, rl.FollowSet);
}
else
{
if (nextRe.IsTerminal())
{
Follows.Add(nextRe);
}
else
{
RuleToken rt = (RuleToken)nextRe;
MyArrayList AllFirstSet = BetaTotalRuleFirstSet(rt);
Follows = ParseHelper.UnionSet(Follows, AllFirstSet);
if (!BetaTotalRuleEpsFree(rt))
{
Follows = ParseHelper.UnionSet(Follows, rl.FollowSet);
}
}
}
}
return(Follows);
}
public int RuleLength()
{
int rl_len = 0;
RuleElement iterator = Start.GetNext();
while (iterator != null)
{
rl_len++;
iterator = iterator.GetNext();
}
return(rl_len);
}
private string[] Rule2String(RuleStart rs)
{
MyArrayList elements = new MyArrayList();
if (rs != null)
{
RuleElement re = rs.GetNext();
while (re != null)
{
elements.Add(re.GetToken());
re = re.GetNext();
}
}
return((string[])elements.ToArray(typeof(string)));
}
public MyArrayList GetAllTokens()
{
MyArrayList tokens = new MyArrayList();
RuleElement re = m_Next;
while (re != null)
{
if (!re.IsTerminal() && !re.GetToken().Equals(""))
{
tokens.Add(re);
}
re = re.GetNext();
}
return(tokens);
}
private MyArrayList Rules2Array(RuleStart rs)
{
MyArrayList invRules = new MyArrayList();
if (rs != null)
{
RuleElement re = rs.GetNext();
while (re != null)
{
invRules.Add(re);
re = re.GetNext();
}
}
return(invRules);
}
public RuleElement GetRulePos(int pos)
{
RuleElement re = GetStart();
for (int i = 0; i < pos; i++)
{
if (re != null)
{
re = re.GetNext();
}
else
{
break;
}
}
return(re);
}
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);
}
public MyArrayList GetAllTerminals()
{
MyArrayList ts = new MyArrayList();
if (Start != null)
{
RuleElement pos = Start.GetNext();
while (pos != null)
{
if (pos.IsTerminal())
{
ts.Add(pos);
}
pos = pos.GetNext();
}
}
return(ts);
}
/// <summary>
/// Find all Tokens inside Rule
/// </summary>
/// <param name="Token">Token String to find</param>
/// <returns></returns>
public MyArrayList FindToken(string Token)
{
MyArrayList sr = new MyArrayList();
if (Start != null)
{
RuleElement pos = Start.GetNext();
while (pos != null)
{
if (pos.GetToken().Equals(Token))
{
sr.Add(pos);
}
pos = pos.GetNext();
}
}
return(sr);
}
public void SetNextToken(String Token, bool Terminal)
{
if (Token == null || Token.Equals(""))
{
act.SetNext(new RuleEpsilon(Start));
}
else
{
if (Terminal)
{
act.SetNext(new RuleTerminal(Token, Start));
}
else
{
act.SetNext(new RuleToken(Token, Start));
}
}
act = act.GetNext();
}
private void EleminateDirectLeftRecursion(RuleStart strt)
{
string ElemStartTkn = "";
if (strt != null)
{
ElemStartTkn = FindUnusedToken(strt.GetToken());
}
while (strt != null)
{
if (IsRuleLeftRekursiv(strt))
{
RuleElement re = strt.GetNext();
if (re != null)
{
strt.SetNext(re.GetNext());
re = GotoLastRule(strt);
re.SetNext(new RuleToken(ElemStartTkn, strt));
strt.SetToken(ElemStartTkn);
}
BNFRule bnfRl = new BNFRule(m_Rules.Count);
bnfRl.SetStart(ElemStartTkn);
bnfRl.GetStart().SetNext(new RuleEpsilon(bnfRl.GetStart()));
m_Rules.Add(bnfRl);
}
else
{
RuleElement re = strt.GetNext();
if (re != null)
{
re = GotoLastRule(strt);
re.SetNext(new RuleToken(ElemStartTkn, strt));
}
}
strt = strt.GetAlternate();
}
}
public string GetRuleString()
{
string res = Start.GetToken() + "->";
RuleElement iterator = Start.GetNext();
while (iterator != null)
{
if (iterator.IsTerminal())
{
res += "'" + iterator.GetToken() + "'";
}
else
{
res += iterator.GetToken();
}
iterator = iterator.GetNext();
if (iterator != null)
{
res += ",";
}
}
res += ".";
return(res);
}