public static ScannerErg GetWord(string Data, int spos, char[] Endsigns, char[] DelSigns)
{
char sign;
char Change = '\\';
ScannerErg scnErg = new ScannerErg();
scnErg.setTermSignNr(-1);
int endpos = Data.Length;
String Word = "";
bool NoEndNext = false;
while (spos < endpos)
{
spos = DelNoSigns(Data, spos, DelSigns);
sign = Data.ToCharArray()[spos];
int nr = DoesContain(sign, Endsigns);
if (NoEndNext == true)
{
NoEndNext = false;
}
else if (sign == Change)
{
NoEndNext = true;
}
if (nr >= 0)
{
if (Endsigns[nr] == Change)
{
NoEndNext = false;
}
if (NoEndNext == false)
{
scnErg.setTermSignNr(nr);
spos++;
break;
}
}
Word += sign;
spos++;
}
scnErg.setSpos(spos);
scnErg.setWord(Word);
return(scnErg);
}
private bool ParseBNF(string BNF)
{
bool bTerminal = false;
bool bDelNoSigns = true;
int automstate = 0;
int len = BNF.Length;
int spos = 0;
char sign;
int failureState = 100;
char[] DelSigns = new char[] { ' ', '\n', '\r', '\t' };
BNFRule actRule = null;
while (spos < len)
{
if (bDelNoSigns)
{
spos = ParseHelper.DelNoSigns(BNF, spos, DelSigns);
}
if (spos < len)
{
sign = BNF.ToCharArray()[spos];
switch (automstate)
{
case 0:
{
actRule = null;
if (sign == '#')
{
spos = ParseHelper.DelComment(BNF, spos);
}
else
{
automstate = 1;
}
break;
}
case 1:
{
char[] EndSigns = new char[] { '-' };
ScannerErg scnErg = ParseHelper.GetWord(BNF, spos, EndSigns, DelSigns);
if (scnErg.getTermSignNr() == 0)
{
actRule = new BNFRule(m_Rules.Count);
actRule.SetStart(scnErg.getWord());
m_Rules.Add(actRule);
automstate = 2;
}
else
{
automstate = failureState;
}
spos = scnErg.getSpos();
break;
}
case 2:
{
if (spos < len && BNF.ToCharArray()[spos] == '>')
{
automstate = 3;
spos++;
}
else
{
automstate = failureState;
}
break;
}
case 3:
{
char[] EndSigns = new char[] { ',', '\'', '|', '.', '$' };
ScannerErg scnErg = ParseHelper.GetWord(BNF, spos, EndSigns, DelSigns);
if (scnErg.getTermSignNr() == 0)
{
actRule.SetNextToken(scnErg.getWord(), bTerminal);
automstate = 3;
bTerminal = false;
}
else if (scnErg.getTermSignNr() == 1)
{
bTerminal = true;
bDelNoSigns = false;
automstate = 4;
}
else if (scnErg.getTermSignNr() == 2)
{
if (scnErg.getWord().Length != 0)
{
actRule.SetNextToken(scnErg.getWord(), bTerminal);
}
else
{
actRule.SetNextToken(scnErg.getWord(), true);
}
string StartSign = actRule.GetStart().GetToken();
actRule = new BNFRule(m_Rules.Count);
actRule.SetStart(StartSign);
m_Rules.Add(actRule);
automstate = 3;
bTerminal = false;
}
else if (scnErg.getTermSignNr() == 3)
{
if (scnErg.getWord().Length != 0)
{
actRule.SetNextToken(scnErg.getWord(), bTerminal);
}
else
{
actRule.SetNextToken(scnErg.getWord(), true);
}
automstate = 0;
bTerminal = false;
}
else if (scnErg.getTermSignNr() == 4)
{
automstate = 3;
bTerminal = true;
}
else
{
automstate = failureState;
}
spos = scnErg.getSpos();
break;
}
case 4:
{
char[] EndSigns = new char[] { '\'' };
ScannerErg scnErg = ParseHelper.GetWord(BNF, spos, EndSigns, null);
if (scnErg.getTermSignNr() == 0)
{
actRule.SetNextToken(scnErg.getWord(), bTerminal);
automstate = 5;
bTerminal = false;
}
else
{
automstate = failureState;
}
bDelNoSigns = true;
spos = scnErg.getSpos();
break;
}
case 5:
{
char[] EndSigns = new char[] { ',', '|', '.' };
ScannerErg scnErg = ParseHelper.GetWord(BNF, spos, EndSigns, DelSigns);
if (scnErg.getTermSignNr() == 0)
{
automstate = 3;
bTerminal = false;
}
else if (scnErg.getTermSignNr() == 1)
{
string StartSign = actRule.GetStart().GetToken();
actRule = new BNFRule(m_Rules.Count);
actRule.SetStart(StartSign);
m_Rules.Add(actRule);
automstate = 3;
bTerminal = false;
}
else if (scnErg.getTermSignNr() == 2)
{
automstate = 0;
bTerminal = false;
}
else
{
automstate = failureState;
}
spos = scnErg.getSpos();
break;
}
default:
{
return(false);
}
}
}
}
return(true);
}
