public CSetSreExpr Difference(CSetSreExpr x, CSetSreExpr[] y)
{
IntSet cset = x.Node.Characters;
foreach (var excluded in y)
{
cset = cset.Except(excluded.Node.Characters);
}
return(CSet(cset));
}
public SreExpr CSet(CSetSreExpr cset)
{
return(new SreExpr {
Node = cset.Node
});
}
public SreExpr Lookahead(CSetSreExpr cset)
{
return(new SreExpr {
Node = new LookaheadNode(cset.Node.Characters)
});
}
public SreExpr Lookback(CSetSreExpr cset)
{
return new SreExpr { Node = new LookbackNode(cset.Node.Characters) };
}
public CSetSreExpr Intersection(CSetSreExpr[] inner)
{
IntSet cset = IntSet.All;
foreach (var included in inner)
{
cset = cset.Intersect(included.Node.Characters);
}
return CSet(cset);
}
public CSetSreExpr Difference(CSetSreExpr x, CSetSreExpr[] y)
{
IntSet cset = x.Node.Characters;
foreach (var excluded in y)
{
cset = cset.Except(excluded.Node.Characters);
}
return CSet(cset);
}
public SreExpr CSet(CSetSreExpr cset)
{
return new SreExpr { Node = cset.Node };
}
public CSetSreExpr ComplementOfUnion(CSetSreExpr[] inner)
{
return new CSetSreExpr { Node = CharSetNode.Union(inner.Select(expr => expr.Node)).Complement() };
}
