static string Str(Node p)
{
StringBuilder s = new StringBuilder();
while (p != null)
{
if (p.typ == Node.chr)
{
s.Append((char)p.val);
}
else if (p.typ == Node.clas)
{
BitArray set = CharClass.Set(p.val);
if (Sets.Elements(set) != 1)
{
Parser.SemErr("character set contains more than 1 character");
}
s.Append((char)Sets.First(set));
}
else
{
Parser.SemErr("comment delimiters may not be structured");
}
p = p.next;
}
if (s.Length == 0 || s.Length > 2)
{
Parser.SemErr("comment delimiters must be 1 or 2 characters long");
s = new StringBuilder("?");
}
return(s.ToString());
}
private static bool Overlap(Action a, Action b)
{
BitArray seta, setb;
if (a.typ == Node.chr)
{
if (b.typ == Node.chr)
{
return(a.sym == b.sym);
}
else
{
setb = CharClass.Set(b.sym);
return(setb[a.sym]);
}
}
else
{
seta = CharClass.Set(a.sym);
if (b.typ == Node.chr)
{
return(seta[b.sym]);
}
else
{
setb = CharClass.Set(b.sym);
return(Sets.Intersect(seta, setb));
}
}
}
public BitArray Symbols()
{
BitArray s;
if (typ == Node.clas)
{
s = (BitArray)CharClass.Set(sym).Clone();
}
else
{
s = new BitArray(CharClass.charSetSize); s[sym] = true;
}
return(s);
}
public Action TheAction(char ch)
{
BitArray s;
for (Action a = firstAction; a != null; a = a.next)
{
if (a.typ == Node.chr && ch == a.sym)
{
return(a);
}
else if (a.typ == Node.clas)
{
s = CharClass.Set(a.sym);
if (s[ch])
{
return(a);
}
}
}
return(null);
}
static void FillStartTab(int[] startTab)
{
startTab[0] = State.lastNr + 1; // eof
for (Action action = firstState.firstAction; action != null; action = action.next)
{
int targetState = action.target.state.nr;
if (action.typ == Node.chr)
{
startTab[action.sym] = targetState;
}
else
{
BitArray s = CharClass.Set(action.sym);
for (int i = 0; i < s.Count; i++)
{
if (s[i])
{
startTab[i] = targetState;
}
}
}
}
}
static void WriteState(State state)
{
Symbol endOf = state.endOf;
gen.WriteLine("\t\t\tcase {0}:", state.nr);
bool ctxEnd = state.ctx;
for (Action action = state.firstAction; action != null; action = action.next)
{
if (action == state.firstAction)
{
gen.Write("\t\t\t\tif (");
}
else
{
gen.Write("\t\t\t\telse if (");
}
if (action.typ == Node.chr)
{
gen.Write(ChCond((char)action.sym));
}
else
{
PutRange(CharClass.Set(action.sym));
}
gen.Write(") {");
if (action.tc == Node.contextTrans)
{
gen.Write("apx++; ");
ctxEnd = false;
}
else if (state.ctx)
{
gen.Write("apx = 0; ");
}
gen.Write("buf.Append(ch); NextCh(); goto case {0};", action.target.state.nr);
gen.WriteLine("}");
}
if (state.firstAction == null)
{
gen.Write("\t\t\t\t{");
}
else
{
gen.Write("\t\t\t\telse {");
}
if (ctxEnd) // final context state: cut appendix
{
gen.WriteLine();
gen.WriteLine("\t\t\t\t\tbuf.Length = buf.Length - apx;");
gen.WriteLine("\t\t\t\t\tpos = pos - apx - 1; line = t.line;");
gen.WriteLine("\t\t\t\t\tBuffer.Pos = pos+1; NextCh();");
gen.Write("\t\t\t\t\t");
}
if (endOf == null)
{
gen.WriteLine("t.kind = noSym; goto done;}");
}
else
{
gen.Write("t.kind = {0}; ", endOf.n);
if (endOf.tokenKind == Symbol.classLitToken)
{
gen.WriteLine("t.val = buf.ToString(); CheckLiteral(); return t;}");
}
else
{
gen.WriteLine("goto done;}");
}
}
}
