public override ParserMatch TryMatch(IScanner scan)
{
int offset = scan.Offset;
var m = new ParserMatch(this, scan, offset, -1);
while (!scan.EndOfInput)
{
offset = scan.Offset;
var a = LeftParser.Parse(scan);
if (!a.Success)
{
scan.Seek(offset);
return m;
}
var b = RightParser.Parse(scan);
if (!b.Success)
{
scan.Seek(offset);
return m;
}
m.AddSubmatch(a);
m.AddSubmatch(b);
}
return m;
}
public override ParserMatch TryMatch(IScanner scan)
{
if (Parser == this) return scan.NoMatch;
// save scanner state
int offset = scan.Offset;
var m = new ParserMatch(this, scan, 0, 0); // empty match with this parser
// execution bound
int count = 0;
// lower bound, minimum number of executions
while (count < LowerBound && !scan.EndOfInput)
{
var m_temp = Parser.Parse(scan);
if (!m_temp.Success) break; // stop if not successful
count++;
m.AddSubmatch(m_temp);
}
if (count == LowerBound)
{
while (count < UpperBound && !scan.EndOfInput)
{
var m_temp = Parser.Parse(scan);
if (!m_temp.Success) break; // stop if not successful
count++;
m.AddSubmatch(m_temp);
}
}
else
{
m = scan.NoMatch;
}
if (m == null) m = scan.NoMatch;
// restoring parser failed, rewind scanner
if (!m.Success) scan.Seek(offset);
return m;
}