protected override bool OnParse(ParseResult result, bool errorPass)
{
if (_inner.Count == 0)
{
return(false);
}
if (result.GetIsInfiniteRecursion())
{
return(result.Error(ParseError.InvalidGrammar, "Grammar contains left recursion"));
}
var results = ResultPool.CreateList();
ParseResult bestResult = null;
foreach (var parser in _inner)
{
var inner = result.Peek(parser, errorPass);
results.Add(inner);
if (inner.IsBetterThan(bestResult))
{
bestResult = inner;
}
}
Debug.Assert(bestResult != null, "bestResult != null");
if (bestResult.Success)
{
result.Apply(bestResult, errorPass);
ResultPool.ReleaseList(results);
return(true);
}
var max = results.Max(x => x.MaxErrorIndex);
foreach (var parseResult in results)
{
if (parseResult.MaxErrorIndex == max)
{
result.Error(parseResult, errorPass);
}
}
ResultPool.ReleaseList(results);
return(false);
}
public ResultHelper(ResultPool resultPool)
{
_resultPool = resultPool;
_resultOwner = new ResultMemoryOwner(resultPool);
}
public ResultMemoryOwner(ResultPool resultPool)
{
_resultPool = resultPool;
}