protected void GenerateAllFirstSets()
{
bool bChanged = true;
while (bChanged)
{
bChanged = false;
for (int i = 0; i < m_Rules.Count; i++)
{
MyArrayList FirstSet = new MyArrayList();
BNFRule bnfRl = (BNFRule)m_Rules[i];
RuleStart strt = bnfRl.GetStart();
if (strt != null)
{
RuleElement re = strt.GetNext();
FirstSet = BetaTotalRuleFirstSet(re);
}
int FrstSize = 0;
if (strt.GetRuleConnect().FirstSet != null)
{
FrstSize = strt.GetRuleConnect().FirstSet.Count;
}
strt.GetRuleConnect().FirstSet = ParseHelper.UnionSet(strt.GetRuleConnect().FirstSet, FirstSet);
FrstSize = strt.GetRuleConnect().FirstSet.Count - FrstSize;
if (FrstSize != 0)
{
bChanged = true;
}
}
}
}
private bool FirstClosureFromRule(MyArrayList Huelle, string Token, MyArrayList FirstSet)
{
bool bChanged = false;
MyArrayList TkRules = base.GetStartRulesOneToken(Token);
if (TkRules != null && Huelle != null)
{
for (int i = 0; i < TkRules.Count; i++)
{
RuleStart rs = (RuleStart)TkRules[i];
int RuleNr = rs.GetRuleConnect().Index;
int HuelPos = RuleInsideHuelle(Huelle, RuleNr, 1);
if (HuelPos < 0)
{
LR1Element LrElm = new LR1Element(rs.GetRuleConnect().Index, m_HuellenCounter, m_LRMECnter++);
LrElm.FirstSet = FirstSet;
Huelle.Add(LrElm);
bChanged = true;
}
else
{
LR1Element LrElm = (LR1Element)Huelle[HuelPos];
int FrstSize = LrElm.FirstSet.Count;
LrElm.FirstSet = ParseHelper.UnionSet(LrElm.FirstSet, FirstSet);
if (FrstSize != LrElm.FirstSet.Count)
{
bChanged = true;
}
}
}
}
return(bChanged);
}
protected void CheckEpsilonInRules()
{
bool bChanged = true;
while (bChanged)
{
bChanged = false;
for (int i = 0; i < m_Rules.Count; i++)
{
bool EpsFree = false;
BNFRule bnfRl = (BNFRule)m_Rules[i];
RuleStart strt = bnfRl.GetStart();
if (strt != null)
{
RuleElement re = strt.GetNext();
EpsFree = BetaTotalRuleEpsFree(re);
}
if (strt.GetRuleConnect().EpsilonFree != EpsFree)
{
bChanged = true;
}
strt.GetRuleConnect().EpsilonFree = EpsFree;
}
}
}
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);
}
protected virtual bool GenerateParseTable()
{
MyArrayList Terminals = GetAllTerminals();
Terminals.Add(new RuleTerminal(m_EofTerminal, null));
MyArrayList StartTokens = GetDifStartTokens();
m_LL1ParseTabelle = new TopDownParseTabelle(Terminals, StartTokens);
bool dblEntry = false;
for (int i = 0; i < m_Rules.Count; i++)
{
BNFRule rl = (BNFRule)m_Rules[i];
RuleStart rs = rl.GetStart();
int len = rs.GetRuleConnect().FirstSet.Count;
for (int j = 0; j < len; j++)
{
RuleElement re = (RuleElement)rs.GetRuleConnect().FirstSet[j];
string colSign = re.GetToken();
string rowSign = rs.GetToken();
if (!m_LL1ParseTabelle.Add(colSign, rowSign, rs))
{
dblEntry = true;
}
}
if (!rl.EpsilonFree)
{
len = rs.GetRuleConnect().FollowSet.Count;
for (int j = 0; j < len; j++)
{
RuleElement re = (RuleElement)rs.GetRuleConnect().FollowSet[j];
string colSign = re.GetToken();
string rowSign = rs.GetToken();
if (!m_LL1ParseTabelle.Add(colSign, rowSign, rs))
{
dblEntry = true;
}
}
}
}
return(!dblEntry);
}
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);
}
private MyArrayList TotalRuleFollowSet(RuleStart rs)
{
MyArrayList res = new MyArrayList();
rs = GoToFirstStartRule(rs);
while (rs != null)
{
res = ParseHelper.UnionSet(res, rs.GetRuleConnect().FollowSet);
rs = rs.GetAlternate();
}
return(res);
}
private bool FirstClosureFromRule(MyArrayList Huelle, string Token)
{
bool bChanged = false;
MyArrayList TkRules = base.GetStartRulesOneToken(Token);
if (TkRules != null && Huelle != null)
{
for (int i = 0; i < TkRules.Count; i++)
{
RuleStart rs = (RuleStart)TkRules[i];
int RuleNr = rs.GetRuleConnect().Index;
if (!IsRuleInsideHuelle(Huelle, RuleNr, 1))
{
LRElement LrElm = new LRElement(rs.GetRuleConnect().Index, m_HuellenCounter, m_LRMECnter++);
Huelle.Add(LrElm);
bChanged = true;
}
}
}
return(bChanged);
}
private bool SetAllFollows(RuleStart rs, MyArrayList Follows)
{
bool changed = false;
rs = GoToFirstStartRule(rs);
while (rs != null)
{
int FlwSize = 0;
if (rs.GetRuleConnect().FollowSet != null)
{
FlwSize = rs.GetRuleConnect().FollowSet.Count;
}
rs.GetRuleConnect().FollowSet = ParseHelper.UnionSet(rs.GetRuleConnect().FollowSet, Follows);
FlwSize = rs.GetRuleConnect().FollowSet.Count - FlwSize;
if (FlwSize != 0)
{
changed = true;
}
rs = rs.GetAlternate();
}
return(changed);
}
// protected virtual void GenerateAllFirstSets()
// {
// for(int i=0;i<m_Rules.Count;i++)
// {
// BNFRule bnfRl = (BNFRule)m_Rules[i];
// RuleStart strt = bnfRl.GetStart();
// strt.GetRuleConnect().FirstSet = GenerateFirstSet(strt);
// }
// }
// protected virtual void CheckEpsilonInRules()
// {
// for(int i=0;i<m_Rules.Count;i++)
// {
// BNFRule bnfRl = (BNFRule)m_Rules[i];
// RuleStart strt = bnfRl.GetStart();
// RuleIsEpsilonFree(strt);
// }
// }
protected bool TotalRuleEpsFree(RuleStart rs)
{
rs = GoToFirstStartRule(rs);
while (rs != null)
{
if (!rs.GetRuleConnect().EpsilonFree)
{
return(false);
}
rs = rs.GetAlternate();
}
return(true);
}
private void DeleteStartRule(RuleStart rs)
{
BNFRule bnfRl = rs.GetRuleConnect();
RuleStart AltNext = rs.GetAlternate();
RuleStart AltBack = rs.GetAlternateBack();
if (AltBack != null)
{
AltBack.SetAlternate(AltNext);
}
if (AltNext != null)
{
AltNext.SetAlternateBack(AltBack);
}
int index = bnfRl.Index;
m_Rules.RemoveAt(index);
}
