static void SimSet(out BitArray s)
{
int n1, n2;
s = new BitArray(CharClass.charSetSize);
if (la.kind == 1)
{
Get();
CharClass c = CharClass.Find(t.val);
if (c == null)
{
SemErr("undefined name");
}
else
{
s.Or(c.set);
}
}
else if (la.kind == 3)
{
Get();
string name = t.val;
name = DFA.Unescape(name.Substring(1, name.Length - 2));
foreach (char ch in name)
{
s[ch] = true;
}
}
else if (la.kind == 5)
{
Char(out n1);
s[n1] = true;
if (la.kind == 22)
{
Get();
Char(out n2);
for (int i = n1; i <= n2; i++)
{
s[i] = true;
}
}
}
else if (la.kind == 23)
{
Get();
s = new BitArray(CharClass.charSetSize, true);
s[0] = false;
}
else
{
SynErr(49);
}
}
public static Graph StrToGraph(string str) {
string s = DFA.Unescape(str.Substring(1, str.Length-2));
if (s.IndexOf('\0') >= 0) Parser.SemErr("\\0 not allowed here. Used as eof character");
if (s.Length == 0) Parser.SemErr("empty token not allowed");
Graph g = new Graph();
g.r = dummyNode;
for (int i = 0; i < s.Length; i++) {
Node p = new Node(Node.chr, (int)s[i], 0);
g.r.next = p; g.r = p;
}
g.l = dummyNode.next; dummyNode.next = null;
return g;
}
static void Char(out int n)
{
Expect(5);
string name = t.val;
name = DFA.Unescape(name.Substring(1, name.Length - 2));
int max = CharClass.charSetSize;
if (name.Length != 1 || name[0] > max - 1)
{
SemErr("unacceptable character value");
}
n = name[0] % max;
}