bool TryParseUntil(int index, out MatchCursor <TInput> match)
{
if (index >= _count)
{
match = default(MatchCursor <TInput>);
return(false);
}
lock (_matches)
{
for (int i = _matches.Count; i <= index; i++)
{
Result <TInput, Match> result = _parser.Parse(_input);
if (result.HasValue)
{
_input = result.Next;
_matches.Add(new MatchCursor <TInput>(this, index, result.Value));
continue;
}
_count = i;
break;
}
}
if (index < _matches.Count)
{
match = _matches[index];
return(true);
}
match = default(MatchCursor <TInput>);
return(false);
}
public bool TryGet(int index, out MatchCursor <TInput> match)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
if (index < _matches.Count)
{
lock (_matches)
match = _matches[index];
return(true);
}
return(TryParseUntil(index, out match));
}
public bool MoveNext()
{
if (_cursor == null)
{
return(_input.TryGet(0, out _cursor));
}
MatchCursor <TInput> nextCursor;
if (_cursor.TryGetNext(out nextCursor))
{
_cursor = nextCursor;
return(true);
}
return(false);
}
public void Reset()
{
_cursor = null;
}
public bool TryGetNext(out MatchCursor <TInput> cursor)
{
return(_input.TryGet(_index + 1, out cursor));
}