static void _ParseCharClassEscape(ParseContext pc, string cls, List <RegexCharsetEntry> result, ref RegexCharsetEntry next, ref bool readDash)
{
if (null != next)
{
result.Add(next);
if (readDash)
{
result.Add(new RegexCharsetCharEntry('-'));
}
result.Add(new RegexCharsetCharEntry('-'));
}
pc.Advance();
result.Add(new RegexCharsetClassEntry(cls));
next = null;
readDash = false;
}
static IList <RegexCharsetEntry> _ParseRanges(ParseContext pc)
{
pc.EnsureStarted();
var result = new List <RegexCharsetEntry>();
RegexCharsetEntry next = null;
bool readDash = false;
while (-1 != pc.Current && ']' != pc.Current)
{
switch (pc.Current)
{
case '[': // char class
if (null != next)
{
result.Add(next);
if (readDash)
{
result.Add(new RegexCharsetCharEntry('-'));
}
result.Add(new RegexCharsetCharEntry('-'));
}
pc.Advance();
pc.Expecting(':');
pc.Advance();
var l = pc.CaptureBuffer.Length;
pc.TryReadUntil(':', false);
var n = pc.GetCapture(l);
pc.Advance();
pc.Expecting(']');
pc.Advance();
result.Add(new RegexCharsetClassEntry(n));
readDash = false;
next = null;
break;
case '\\':
pc.Advance();
pc.Expecting();
switch (pc.Current)
{
case 'h':
_ParseCharClassEscape(pc, "space", result, ref next, ref readDash);
break;
case 'd':
_ParseCharClassEscape(pc, "digit", result, ref next, ref readDash);
break;
case 'D':
_ParseCharClassEscape(pc, "^digit", result, ref next, ref readDash);
break;
case 'l':
_ParseCharClassEscape(pc, "lower", result, ref next, ref readDash);
break;
case 's':
_ParseCharClassEscape(pc, "space", result, ref next, ref readDash);
break;
case 'S':
_ParseCharClassEscape(pc, "^space", result, ref next, ref readDash);
break;
case 'u':
_ParseCharClassEscape(pc, "upper", result, ref next, ref readDash);
break;
case 'w':
_ParseCharClassEscape(pc, "word", result, ref next, ref readDash);
break;
case 'W':
_ParseCharClassEscape(pc, "^word", result, ref next, ref readDash);
break;
default:
var ch = (char)_ParseRangeEscapePart(pc);
if (null == next)
{
next = new RegexCharsetCharEntry(ch);
}
else if (readDash)
{
result.Add(new RegexCharsetRangeEntry(((RegexCharsetCharEntry)next).Value, ch));
next = null;
readDash = false;
}
else
{
result.Add(next);
next = new RegexCharsetCharEntry(ch);
}
break;
}
break;
case '-':
pc.Advance();
if (null == next)
{
next = new RegexCharsetCharEntry('-');
readDash = false;
}
else
{
if (readDash)
{
result.Add(next);
}
readDash = true;
}
break;
default:
if (null == next)
{
next = new RegexCharsetCharEntry((char)pc.Current);
}
else
{
if (readDash)
{
result.Add(new RegexCharsetRangeEntry(((RegexCharsetCharEntry)next).Value, (char)pc.Current));
next = null;
readDash = false;
}
else
{
result.Add(next);
next = new RegexCharsetCharEntry((char)pc.Current);
}
}
pc.Advance();
break;
}
}
if (null != next)
{
result.Add(next);
if (readDash)
{
next = new RegexCharsetCharEntry('-');
result.Add(next);
}
}
return(result);
}