private RegExp ParseCharClassExp()
{
if (this.Match('['))
{
bool negate = false;
if (this.Match('^'))
{
negate = true;
}
RegExp e = this.ParseCharClasses();
if (negate)
{
e = RegExp.MakeIntersection(RegExp.MakeAnyChar(), RegExp.MakeComplement(e));
}
if (!this.Match(']'))
{
throw new ArgumentException("expected ']' at position " + pos);
}
return(e);
}
return(this.ParseSimpleExp());
}
private RegExp ParseSimpleExp()
{
if (this.Match('.'))
{
return(RegExp.MakeAnyChar());
}
if (this.Check(RegExpSyntaxOptions.Empty) && this.Match('#'))
{
return(RegExp.MakeEmpty());
}
if (this.Check(RegExpSyntaxOptions.Anystring) && this.Match('@'))
{
return(RegExp.MakeAnyString());
}
if (this.Match('"'))
{
int start = pos;
while (this.More() && !this.Peek("\""))
{
this.Next();
}
if (!this.Match('"'))
{
throw new ArgumentException("expected '\"' at position " + pos);
}
return(RegExp.MakeString(b.Substring(start, ((pos - 1) - start))));
}
if (this.Match('('))
{
if (this.Match('?'))
{
this.SkipNonCapturingSubpatternExp();
}
if (this.Match(')'))
{
return(RegExp.MakeString(string.Empty));
}
RegExp e = this.ParseUnionExp();
if (!this.Match(')'))
{
throw new ArgumentException("expected ')' at position " + pos);
}
return(e);
}
if ((this.Check(RegExpSyntaxOptions.Automaton) || this.Check(RegExpSyntaxOptions.Interval)) && this.Match('<'))
{
int start = pos;
while (this.More() && !this.Peek(">"))
{
this.Next();
}
if (!this.Match('>'))
{
throw new ArgumentException("expected '>' at position " + pos);
}
string str = b.Substring(start, ((pos - 1) - start));
int i = str.IndexOf('-');
if (i == -1)
{
if (!this.Check(RegExpSyntaxOptions.Automaton))
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
return(RegExp.MakeAutomaton(str));
}
if (!this.Check(RegExpSyntaxOptions.Interval))
{
throw new ArgumentException("illegal identifier at position " + (pos - 1));
}
try
{
if (i == 0 || i == str.Length - 1 || i != str.LastIndexOf('-'))
{
throw new FormatException();
}
string smin = str.Substring(0, i - 0);
string smax = str.Substring(i + 1, (str.Length - (i + 1)));
int imin = int.Parse(smin, CultureInfo.CurrentCulture);
int imax = int.Parse(smax, CultureInfo.CurrentCulture);
int numdigits = smin.Length == smax.Length ? smin.Length : 0;
if (imin > imax)
{
int t = imin;
imin = imax;
imax = t;
}
return(RegExp.MakeInterval(imin, imax, numdigits));
}
catch (FormatException)
{
throw new ArgumentException("interval syntax error at position " + (pos - 1));
}
}
return(RegExp.MakeChar(this.ParseCharExp()));
}
