/// <exclude/>
public Dfa(Nfa nfa)
: base(nfa.m_tks)
{
m_tokens = m_tks.m_tokens;
AddNfaNode(nfa); // the starting node is Closure(start)
Closure();
AddActions(); // recursively build the Dfa
}
/// <exclude/>
public virtual void Build(Nfa nfa)
{
if (m_sub!=null)
{
Nfa sub = new Nfa(nfa.m_tks,m_sub);
nfa.AddEps(sub);
sub.m_end.AddEps(nfa.m_end);
}
else
nfa.AddEps(nfa.m_end);
}
public override void Build(Nfa nfa)
{
Nfa sub = new Nfa(nfa.m_tks,m_sub);
nfa.AddEps(sub);
nfa.AddEps(nfa.m_end);
sub.m_end.AddEps(nfa);
}
public override void Build(Nfa nfa)
{
int j,n = m_str.Length;
NfaNode p, pp = nfa;
for (j=0;j<n;pp = p,j++)
{
p = new NfaNode(nfa.m_tks);
pp.AddUArc(m_str[j],p);
}
pp.AddEps(nfa.m_end);
}
public override void Build(Nfa nfa)
{
nfa.AddArcEx(this,nfa.m_end);
}
public override void Build(Nfa nfa)
{
base.Build(nfa);
nfa.m_end.AddEps(nfa);
}
/// <exclude/>
public override void Build(Nfa nfa)
{
if (m_next!=null)
{
if (m_sub!=null)
{
Nfa first = new Nfa(nfa.m_tks,m_sub);
Nfa second = new Nfa(nfa.m_tks,m_next);
nfa.AddEps(first);
first.m_end.AddEps(second);
second.m_end.AddEps(nfa.m_end);
}
else
m_next.Build(nfa);
}
else
base.Build(nfa);
}
/// <exclude/>
public override void Build(Nfa nfa)
{
if (m_alt!=null)
{
Nfa alt = new Nfa(nfa.m_tks,m_alt);
nfa.AddEps(alt);
alt.m_end.AddEps(nfa.m_end);
}
base.Build(nfa);
}
void _Create()
{
m_outFile.WriteLine("using System;using Tools;");
m_tokens = new YyLexer(erh);
string buf = "";
string str = "";
string name="";
string startsym;
Nfa nfa;
int p,q,max;
Console.WriteLine("Reading Input File");
while (!m_inFile.Eof())
{
buf = m_inFile.ReadLine();
startsym = "YYINITIAL";
max = buf.Length;
p = 0;
if (!White(buf,ref p,max))
continue;
if (buf[p]=='%')
{ // directive
// %lexer
if(buf.Length>=p+6 && "%lexer".Equals(buf.Substring(p,6)))
{
m_lexerseen = true;
p+=6;
if (!White(buf,ref p, max))
continue;
q = p;
NonWhite(buf,ref p, max);
if (q!=p)
m_outname = buf.Substring(q,p-q);
continue;
}
// %encoding
if (buf.Length>=p+9 && "%encoding".Equals(buf.Substring(p,9)))
{
p+=9; White(buf,ref p, max);
q = p;
NonWhite(buf,ref p, max);
m_tokens.InputEncoding = buf.Substring(q,p-q);
continue;
}
// %namespace
if (buf.Length>=p+10 && "%namespace".Equals(buf.Substring(p,10)))
{
p+=10; White(buf,ref p,max);
q = p;
NonWhite(buf,ref p,max);
m_outFile.WriteLine("namespace "+buf.Substring(q,p-q)+" {");
m_namespace = true;
continue;
}
// %define
if(buf.Length>=p+7 && "%define".Equals(buf.Substring(p,7)))
{
p+=7; White(buf,ref p,max);
q = p;
if (!NonWhite(buf,ref p,max))
{
erh.Error(new CSToolsException(44,"Bad define"));
continue;
}
name=buf.Substring(q,p-q);
p++;
if (White(buf,ref p,max))
defines[name]=buf.Substring(p,max-p);
}
else
// % token/node
if (buf.Length>=p+6 && "%token".Equals(buf.Substring(p,6)))
EmitClassDefin(buf,ref p,max,m_inFile,"TOKEN", out str,out name,true);
else if (buf.Length>=p+5 && "%node".Equals(buf.Substring(p,5)))
EmitClassDefin(buf,ref p,max,m_inFile,"NODE",out str,out name,true);
else if (buf.Length>=p+2 && "%{".Equals(buf.Substring(p,2)))
CopyCode();
else if (buf.Length>=p+9 && "%declare{".Equals(buf.Substring(p,9)))
{
p += 8;
m_actvars = ToBraceIfFound(ref buf,ref p,ref max,m_inFile);
m_actvars = m_actvars.Substring(1,m_actvars.Length-2);
}
else
m_tokens.erh.Error(new CSToolsException(8,"Unknown directive "+buf.Substring(p,max-p)));
continue;
}
else if (buf[p]=='<')
{ // startstate
q = p++;
while (p<max && buf[p]!='>')
p++;
if (p++ ==max)
{
m_tokens.erh.Error(new CSToolsException(25,"Bad startsymbol"));
continue;
}
startsym = buf.Substring(q+1,p-q-2);
White(buf, ref p, max);
}
q=p; // can't simply look for nonwhite space here because embedded spaces
GetRegex(buf,ref p,max);
string trgx = buf.Substring(q,p-q);
if (m_tokens.toupper)
trgx = trgx.ToUpper();
Regex rgx = new Regex(this,q,trgx);
Nfa nfa1= new Nfa(this,rgx);
if (!m_startstates.Contains(startsym))
m_startstates[startsym] = new Nfa(this);
nfa = (Nfa)m_startstates[startsym];
nfa.AddEps(nfa1);
White(buf,ref p,max);
m_actions[nfa1.m_end.m_state] = nfa1.m_end;
// handle multiline actions enclosed in {}
nfa1.m_end.m_sTerminal = ToBraceIfFound(ref buf,ref p, ref max,m_inFile);
// examine action string
if (nfa1.m_end.m_sTerminal.Length>0 && nfa1.m_end.m_sTerminal[0] == '%')
{
string tokClass,b = nfa1.m_end.m_sTerminal;
q = 1;
max = b.Length;
int n;
for (n=0;q<max&&b[q]!=' '&&b[q]!='\t'&&b[q]!='\n'&&b[q]!='{'&&b[q]!=':';q++,n++) // extract the class name
;
tokClass = b.Substring(1,n); // new-style auto token construction
object ob = m_tokens.tokens[tokClass];
TokClassDef t = (TokClassDef)ob;
bool isNew = (t==null);
// check for initialisation action following %name
string init = b.Substring(n+1,b.Length-n-1);
string bas1 = "TOKEN";
bool haveInit = false;
for (int j=0;j<init.Length;j++)
if (init[j]=='{')
{
haveInit = true;
break;
}
else if (init[j]==':')
{
bas1 = "";
for (;init[j]==' '||init[j]=='\r';j++)
;
for (;init[j]!=' '&&init[j]!='\t'&&init[j]!='{'&&init[j]!='\n';j++)
bas1 += init[j];
break;
}
if (isNew && tokClass!="TOKEN")
{ // this token class has not been declared. Do so now
bool isNode = (m_tokens.tokens[bas1]!=null);
t = new TokClassDef(this,tokClass,bas1); // updates TOKEN.tokens
m_outFile.WriteLine("//%{0}+{1}",tokClass,t.m_yynum);
m_outFile.Write("public class {0} : {1}",tokClass,bas1);
m_outFile.WriteLine("{ public override string yyname { get { return \""+tokClass+"\";}}");
m_outFile.WriteLine("public override int yynum { get { return "+t.m_yynum+"; }}");
m_outFile.WriteLine(" public "+tokClass+"(Lexer yyl):base(yyl) {}}");
}
if (haveInit && init.IndexOf("%except")<0)
{
init = init.Replace("yylval","yymval"); // yuk: avoid the next line munging yylval
init = FixActions(init);
init = init.Replace("yymval","yylval");
nfa1.m_end.m_sTerminal = "%"+NewConstructor(t,init);
}
}
}
if (!m_lexerseen)
m_tokens.erh.Error(new CSToolsException(26,"No %lexer directive detected: possibly incorrect text encoding?"));
Console.WriteLine("Constructing DFAs");
foreach (string s in m_startstates.Keys)
{
Dfa d = new Dfa((Nfa)m_startstates[s]);
m_tokens.starts[s] = d;
if (d.m_actions!=null)
Console.WriteLine("Warning: This lexer script generates an infinite token stream on bad input");
}
Console.WriteLine("Output phase");
Emit(m_actions,m_actvars,m_namespace,m_showDfa);
Console.WriteLine("End of Create");
object o = m_tokens.starts["YYINITIAL"];
if (o == null)
Console.WriteLine("Warning: No lexer");
else if (((Dfa)o).m_actions!=null) // repeat the above warning
Console.WriteLine("Warning: This lexer script generates an infinite token stream on bad input");
}
