public QStr Str(char[] buffer, int start, int length)
{
return(QStr.Parse(buffer, start, length));
}
public SreExpr LiteralMatch(QStr str)
{
return new SreExpr { Node = new CatNode(str.Text.Select(ch => CharSetNode.Create(ch))) };
}
public IntSet Range(QStr charPairs)
{
var intervals = new List<IntInterval>();
string text = charPairs.Text;
int len = text.Length;
if (len % 2 != 0)
{
throw new Exception("Invalid range pairs.");
}
for (int i = 0; i < len; i+=2)
{
intervals.Add(new IntInterval(text[i], text[i + 1]));
}
var cset = IntSet.Ranges(intervals.ToArray());
return cset;
}
public CSetSreExpr CharSet(QStr str)
{
return CSet(IntSet.Of(str.Text));
}