public override void Chain(Trampoline t, Input input, OnChainResult result)
{
if (IsLL1())
{
if (input.EOF)
{
result(Result.Failure(input, FailureType.UnexpectedEndOfStream));
}
else
{
var predict = Predict();
Parser parser;
if (predict.TryGetValue(input.Current, out parser))
{
parser.Chain(t, input, result);
}
else
{
result(Result.Failure(input, FailureType.UnexpectedChars));
}
}
}
else
{
var thunk = new ThunkParser(this, (tr, i, onResult) =>
{
var results = new HashSet<IResult>();
var predicted = false;
var gather = Gather();
foreach (var p in gather)
{
if ((!i.EOF || p.First() == Misc.UniversalCharSet)
|| (i.EOF || p.First().Contains(i.Current)))
{
predicted = true;
tr.Add(p, i, r =>
{
if (!results.Contains(r))
{
Misc.Trace("Reduced: {0} *=> {1}", this, r);
onResult(r);
results.Add(r);
}
});
}
}
if (!predicted)
{
if (i.EOF)
{
onResult(Result.Failure(i, FailureType.UnexpectedEndOfStream));
}
else
{
onResult(Result.Failure(i, FailureType.UnexpectedChars));
}
}
});
t.Add(thunk, input, result);
}
}
